Pure hydraulic control driving and parking integrated caliper disc brakeTechnical Field
The invention relates to the technical field of vehicle braking, in particular to a pure hydraulic control driving and parking integrated caliper disc brake.
Background
The caliper disc brake is one kind of disc brake, its rotating element is metal disc with end face, called brake disc, and its fixed element is one brake block comprising friction block with small working area and its metal back plate, and each brake has 2-4 brake blocks and its actuating device mounted on the caliper body across the two sides of the brake disc.
The left and right caliper bodies of the traditional caliper disc brake are symmetrically arranged in position, but are different in structure, and the left caliper body or the right caliper body is provided with a mounting part for connecting a frame, so that a brake manufacturer needs to produce two caliper bodies with different structures during manufacturing, and the cost is increased. In addition, the parking function of the caliper disc brake in the current market is realized through the same piston, the parking function is designed in the driving piston at the left side or the right side, the braking structures in the left and right caliper bodies are different, the parking function is realized through wire control or electric control, the driving function is realized through hydraulic control, the structure is complex, at least two different finished products exist when the brake is assembled and delivered from the factory, so that the braking requirement of a vehicle is met, and the situation that driving is involved after the parking failure exists.
Disclosure of Invention
The invention aims to provide a pure hydraulic control driving and parking integrated caliper disc type brake which aims at overcoming the defects of the prior art, can realize service braking and parking braking, and the two types of braking are mutually independent and noninterfere, so that reliable braking is realized, the whole brake is of a completely symmetrical left-right structure, the types of parts are reduced, the manufacturing cost is reduced, and the universality is higher.
The technical scheme for realizing the purpose of the invention is as follows:
the pure hydraulic control driving and parking integrated caliper disc brake comprises two caliper bodies which are identical in structure and symmetrically and fixedly connected, wherein a driving cavity and a parking cavity which are mutually independent are arranged in each caliper body, the driving cavities on the two caliper bodies are mutually communicated and provided with driving oil inlets, and the parking cavities on the two caliper bodies are mutually communicated and provided with parking oil inlets; the driving cavity and the parking cavity are respectively provided with a driving braking unit and a parking braking unit in a sealing manner, friction plates are symmetrically arranged on the inner sides of the two caliper bodies, and an installation space suitable for accommodating a brake disc is formed between the two friction plates; a braking gap is arranged between the service braking unit and the friction plate, and a flexible return mechanism is connected between the parking braking unit and the friction plate; the two pliers bodies are provided with through holes, and long bolts which penetrate front and back and are suitable for being screwed on the vehicle body are arranged in the two through holes.
The driving brake unit comprises a driving piston which is arranged in the driving cavity in a sliding sealing manner, one end of the driving piston, which is far away from the friction plate, is provided with a stop sealing rod, one end of the stop sealing rod is movably inserted into the driving piston, the other end of the stop sealing rod extends to the outer part of the pliers body and is provided with an O-shaped ring with the pliers body, the outer part of the pliers body is sequentially provided with a gasket and a fastening nut which are coaxially arranged on the stop sealing rod, and the stop sealing rod is fixedly connected with the pliers body through the fastening nut and the gasket; an annular installation space is formed by enclosing the stop sealing rod, the traveling crane piston and the clamp body, and a traveling crane abrasion self-compensating device which is suitable for adjusting the relative position of the traveling crane piston and the stop sealing rod is arranged in the annular installation space.
Further, driving wearing and tearing self compensating device is including overlapping in proper order to establish T shape clamp plate and the holding ring of interval distribution on the locking sealing rod, the terminal surface of T shape clamp plate is equipped with a plurality of through-holes, the inner circle and the locking sealing rod clearance fit of T shape clamp plate, one side that the friction disc was kept away from to the outer lane is equipped with fixed mounting and drives the hole circlip on the piston, the inner circle and the locking sealing rod interference fit of holding ring and interference force be F1, the butt has driving dish spring assembly between T shape clamp plate and the holding ring, driving dish spring assembly's elasticity is F2 and satisfies F2 < F1.
Further, an inner hexagonal counter bore is formed in the end face of the other end of the stop sealing rod.
Further, the parking braking unit comprises a parking piston and a parking push rod which are arranged in the parking cavity in a sliding sealing mode, a parking abrasion self-compensating device is connected between the parking piston and the parking push rod, an annular groove is formed in one end, away from the friction plate, of the parking piston, and a parking disc spring assembly is abutted between the annular groove and the clamp body.
Further, the parking wear self-compensating device comprises a wear compensating ring coaxially arranged on the parking push rod, a gap is arranged between the outer ring of the wear compensating ring and the inner ring of the piston, the inner ring is provided with female threads, the outer ring of the parking push rod is provided with corresponding male threads, the section of each female thread is in a right trapezoid shape, and the section of each male thread is in a right triangle shape; the axial positions of the wear compensation ring and the parking piston are relatively fixed, and a thrust ball bearing is connected between the wear compensation ring and the parking piston.
Further, the end face of the parking push rod, which is far away from the friction plate, is provided with a groove along the horizontal direction, the flexible return mechanism comprises a guide rod which is arranged in the groove and penetrates through the parking push rod, one end of the guide rod is fixedly connected with the friction plate, a return spring which is sleeved on the guide rod and precompressed is arranged between the other end of the guide rod and the parking push rod, and the elastic force of the return spring is smaller than the sealing force between the parking push rod and the clamp body.
Further, the parking cavity is positioned at the center of the clamp bodies, two driving cavities on each clamp body are communicated with each other, and the driving cavities are positioned at two sides of the parking cavity respectively; the top of the clamp body is provided with parking oil pipes which are respectively communicated with the two parking cavities; the side of the clamp body is provided with a traveling crane oil pipe, and two ends of the traveling crane oil pipe are respectively communicated with traveling crane cavities on the two clamp bodies.
Further, a first dust ring is arranged between one side of the travelling cavity, which is close to the friction plate, and the travelling brake unit; and a second dust ring is arranged between one side of the parking cavity, which is close to the friction plate, and the parking brake unit.
By adopting the technical scheme, the invention has the following beneficial effects:
(1) According to the invention, through structural optimization of the two clamp bodies, the traditional design is changed, so that the two clamp bodies are identical in structure, the types of parts are reduced, the manufacturing cost is reduced, and the whole brake is of a symmetrical structure and is installed on a vehicle body through a long bolt, so that the universality is higher; in addition, the invention breaks through the traditional design on the braking structure, can realize service braking and parking braking on the premise of keeping the original size of the brake, and the two types of braking are independent and noninterference, are both hydraulic control, so that the braking is more stable, a line control or an electric control system is not required to be additionally increased, and the complexity of the whole vehicle is reduced.
(2) The invention changes the design that each part needs to be pressed into the driving cavity in sequence in the traditional structure, realizes the modularized design of the braking unit, and because the stop sealing rod of the braking unit is fixed with the caliper body through the fastening nut positioned outside the caliper body, the driving piston, the driving abrasion self-compensating device and the stop sealing rod can be assembled in advance to form a whole when in actual assembly, and then the driving piston, the driving abrasion self-compensating device and the stop sealing rod are arranged in the driving cavity.
(3) The self-compensating device for the running wear has the advantages of simple structure, convenient control, improved structural stability, no external interference, good running environment and high reliability, and is completely positioned in the running piston.
(4) According to the invention, the inner hexagonal counter bore is formed in the end face of the stop sealing rod, so that the fastening nut and the gasket can be conveniently screwed down, and follow-up rotation is prevented.
(5) The parking brake unit is also provided with the parking wear self-compensating device, so that the reliability of a brake system is improved, the parking brake force is provided by the parking disc spring assembly, the accurate calculation is convenient, the controllability is higher, the axial dimension is small, the rigidity is stable, and the range is large.
(6) The parking wear self-compensating device adopts a wear compensating ring with ingenious structure, is relatively fixed with the axial position between the parking piston and the parking push rod, is provided with a special thread structure, can relatively rotate when the oblique sides of the female thread and the male thread are tightly attached to bear force, so that the parking wear self-compensating device and the parking push rod axially move, can not rotate due to self-locking effect when the right-angle sides of the female thread and the male thread are tightly attached to bear force, and further does not relatively move with the parking push rod, so that the friction plate is propped up to death, automatic compensation can be realized when the wear occurs, and complex transmission is abandoned due to the overall structural design.
(7) The flexible return assembly adopts a structure of combining the guide rod and the return spring, not only can provide return force, but also the guide rod provides a certain guiding function for the movement of the friction plate, so that the parking brake is more stable.
(8) According to the invention, the parking cavity is arranged in the middle of the caliper body, and the two traveling cavities are respectively arranged at two sides of the parking cavity, so that the layout is more reasonable, the braking is more stable, uneven abrasion of the friction plate is avoided, and the utilization rate of the friction plate is improved; simultaneously realize the parking chamber intercommunication on two pincers bodies through external parking oil pipe, realize the driving chamber intercommunication on two pincers bodies through external driving oil pipe, avoid seting up complicated oil circuit on the pincers body, reduce cost.
(9) According to the invention, the dustproof rings are arranged on the driving cavity and the parking cavity, so that the inner cavity is protected, and the phenomenon that the piston moves smoothly to influence the braking effect due to the fact that external dust or friction scraps enter the cavity is avoided.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments that are illustrated in the appended drawings, in which:
FIG. 1 is a front view of the present invention;
FIG. 2 is a left side view of the present invention;
FIG. 3 is a schematic view of the mounting structure of the present invention and a vehicle body;
FIG. 4 is a schematic view of the friction plate and bracket mounting structure of the present invention;
FIG. 5 is a cross-sectional view taken along the A-A plane of FIG. 2 (a scheme view of the intake of a vehicle);
FIG. 6 is a view of a parking oil feed scheme of the present invention;
FIG. 7 is a schematic illustration of the service brake unit of the present invention;
FIG. 8 is a diagram of the detection of the self-compensating device for wear of a vehicle according to the present invention;
FIG. 9 is a schematic view of the structure of the parking brake unit of the present invention;
fig. 10 is an enlarged view of the threads of the inventive wear compensating ring and parking pushrod.
The reference numerals in the drawings are:
The hydraulic brake caliper comprises a caliper body 1, a driving oil inlet 2, a parking oil inlet 3, a driving brake unit 4, a driving piston 4-1, a stop sealing rod 4-2, a gasket 4-3, a fastening nut 4-4, an inner hexagonal counter bore 4-5, a T-shaped pressing plate 4-6, a positioning ring 4-7, a hole elastic retainer ring 4-8, a driving disc spring group 4-9, a parking brake unit 5, a parking piston 5-1, a parking push rod 5-2, a parking disc spring assembly 5-3, a thrust ball bearing 5-4, a wear compensation ring 5-5, a copper pad 5-6, a round nut 5-7, a second sealing ring 5-8, a friction plate 6, a flexible return mechanism 7, a guide rod 7-1, a return spring 7-2, a long bolt 8, a parking oil pipe 9, a driving oil pipe 10, a bracket 11 and a sliding chute 11-1.
Detailed Description
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
Example 1
The pure hydraulic control driving and parking integrated caliper disc brake shown in fig. 1 to 7 comprises two caliper bodies 1 which are arranged in a front-back symmetrical mode and have the same structure, each caliper body 1 is provided with a driving cavity and a parking cavity which are independent of each other, the driving cavities on the two caliper bodies 1 are mutually communicated and provided with driving oil inlets 2, and the parking cavities on the two caliper bodies 1 are mutually communicated and provided with parking oil inlets 3. Each driving cavity and each parking cavity are respectively provided with a driving braking unit 4 and a parking braking unit 5 in a sealing mode, friction plates 6 are symmetrically arranged on the inner sides of the two caliper bodies 1, an installation space suitable for accommodating a brake disc is formed between the two friction plates 6, a braking gap is formed between the driving braking unit 4 and the friction plates 6, and a flexible return mechanism 7 is connected between the parking braking unit 5 and the friction plates 6. The two clamp bodies 1 are provided with through holes, and a long bolt 8 penetrating through the two through holes is arranged, and the clamp bodies 1 are screwed on the vehicle body through the long bolt 8. According to the embodiment, through carrying out structural optimization on the two clamp bodies 1, the traditional design is changed, the structure is completely the same, the types of parts are reduced, the manufacturing cost is reduced, the whole brake is of a symmetrical structure, left side installation or right side installation is not required to be considered, and the universality is higher. The brake structure breaks through the traditional design, on the premise of keeping the original brake size, the service brake can be realized, the parking brake can also be realized, the two brakes are independent and noninterference, hydraulic control is adopted, the brake is more stable, a line control or an electric control system is not required to be additionally increased, and the complexity of the whole vehicle is reduced.
Specifically, the parking chamber is located the center department of the pincers body 1, and the driving chamber on every pincers body 1 all is equipped with two and communicates each other, and is located the both sides in parking chamber respectively, and the overall arrangement is more reasonable, and it is more steady to brake, avoids friction disc 6 wearing and tearing uneven in long-term use, improves the utilization ratio of friction disc 6. The bottoms of the two driving cavities on the same clamp body 1 are communicated with an oil way arranged on the clamp body 1, so that the overall dimension is reduced. The top of the clamp body 1 is provided with parking oil pipes 9 which are respectively communicated with two parking cavities; the driving oil pipe 10 is installed to the side of the pincers body, and driving cavity on two pincers bodies 1 is linked together respectively to driving oil pipe 10's both ends, and this embodiment realizes the intercommunication through external oil pipe, avoids seting up complicated oil circuit on pincers body 1, reduce cost. During actual manufacturing, the processing cavity can form a plurality of inlets, the plug can be pre-installed to realize sealing, and the air release valve is replaced according to the installation position and the requirement to exhaust air in the cavity, or the air release valve is replaced by an adapter to be used for leading oil into the cavity or connecting the oil pipe to form a closed oil path. As shown in fig. 4, the two sides of the caliper body 1 are fixedly and symmetrically provided with the brackets 11, the inner sides of the brackets 11 are provided with the sliding grooves 11-1, and the friction plates 6 are slidably arranged in the sliding grooves 11-1, so that the brake disc is pressed under the action of the brake unit.
The scheme of driving oil inlet is shown in fig. 5, after entering from the driving oil inlet 2 of the right driving cavity, the oil enters the left driving cavity after entering the oil path interconnecting the left driving cavity and the right driving cavity downwards, and continues to enter the driving oil pipe 10 upwards, so that the oil enters the driving cavity of the rear caliper body 1, and a driving brake oil path of the whole brake is formed. The parking oil inlet scheme is shown in fig. 6, the parking oil enters the parking cavity from the parking oil inlet 3, one path fills one side parking oil cavity, the other path enters the parking oil pipe 9 and is led into the rear side parking cavity.
As shown in fig. 7, the service brake unit 4 includes a service piston 4-1, a stopper seal rod 4-2, and a service wear self-compensating device. The first sealing ring is embedded in the driving cavity, and the inner ring of the first sealing ring is in interference fit with the outer ring of the driving piston 4-1, so that the driving piston 4-1 is arranged in the driving cavity in a sliding sealing manner. The right end of the stop sealing rod 4-2 is movably inserted into the driving piston 4-1, an O-shaped ring is arranged between the left end of the stop sealing rod 4-2 extending to the outside of the clamp body 1 and the clamp body 1, a gasket 4-3 and a fastening nut 4-4 are coaxially arranged on the stop sealing rod 4-2 extending to the outside of the clamp body 1 in sequence, an inner hexagonal counter bore 4-5 is arranged on the left end face of the stop sealing rod 4-2, the stop sealing rod 4-2 is clamped by inserting an inner hexagonal tool into the inner hexagonal counter bore 4-5, and the fastening nut 4-4 and the gasket 4-3 are conveniently screwed to prevent follow-up.
An annular installation space is formed by enclosing the stop sealing rod 4-2, the travelling crane piston 4-1 and the clamp body 1, and the travelling crane abrasion self-compensating device is arranged in the annular installation space and comprises a T-shaped pressing plate 4-6, a positioning ring 4-7, a hole elastic retainer ring 4-8 and a travelling crane disc spring set 4-9. The T-shaped pressing plate 4-6 and the positioning ring 4-7 are sleeved on the stop sealing rod 4-2 at intervals, and a plurality of through holes are formed in the end face of the T-shaped pressing plate 4-6, so that hydraulic oil can conveniently enter an area surrounded by the right side and the driving piston 4-1. The inner ring of the T-shaped pressing plate 4-6 is in clearance fit with the stop sealing rod 4-2, the hole elastic retainer ring 4-8 is positioned on the left side of the T-shaped pressing plate 4-6 and fixedly installed on the inner ring of the traveling piston 4-1, the inner ring of the positioning ring 4-7 is in interference fit with the stop sealing rod 4-2, the interference force is F1, the traveling disc spring assembly 4-9 is abutted between the T-shaped pressing plate 4-6 and the positioning ring 4-7, the elastic force is F2, and meanwhile F2 is smaller than F1. The whole structure is simple, the control is convenient, the structural stability is improved, the driving piston is completely positioned inside the driving piston, no external interference exists, the operation environment is excellent, and the reliability is high.
When the brake disc is not worn, the driving piston 4-1 pushes the friction plate 6 to press the brake disc to realize braking, at the moment, because the elastic force F2 of the driving disc spring assembly 4-9 is smaller than the interference force F1 of the inner ring of the positioning ring 4-7 and the stop sealing rod 4-2, the driving piston 4-1 drives the T-shaped pressing plate to compress the driving disc spring assembly 4-9, and in the preset braking clearance range, the T-shaped pressing plate 4-6 is not in direct contact with the positioning ring 4-7, and the positioning ring 4-7 is kept motionless; after the friction plate 6 is worn by delta, the driving piston 4-1 drives the T-shaped pressing plate 4-6 to compress the driving disc spring assembly 4-9, and as the driving braking force is far greater than the interference force F1, the T-shaped pressing plate 4-6 is contacted with the positioning ring 4-7 to continuously push the positioning ring 4-7 to move until the driving braking is realized, and when the driving is relieved, the positioning ring 4-7 is kept still, so that the initial position of the driving piston 4-1 is changed, the delta is moved towards the friction plate 6 relative to the stop sealing rod 4-2, the abrasion of the friction plate 6 is exactly compensated, and the automatic abrasion compensation is realized.
According to the embodiment, the driving brake unit 4 changes the design that all parts are needed to be pressed into the driving cavity in sequence in the traditional structure, the modularized design of the brake unit is realized, and the stop sealing rod 4-2 of the brake unit is fixed with the clamp body 1 through the fastening nut 4-4 positioned outside the clamp body 1, so that the driving piston 4-1, the driving wear self-compensating device and the stop sealing rod 4-2 can be assembled into a whole in advance during actual assembly, and then the driving piston, the driving wear self-compensating device and the stop sealing rod 4-2 are installed in the driving cavity. As shown in FIG. 8, in order to avoid failure of adjustment caused by excessive elasticity of the traveling disc spring assembly 4-9 or excessive interference force of the positioning ring 4-7 and the stop sealing rod 4-2, the traveling brake unit 4 is placed on the detection platform as an integral module, a tool matched with the T-shaped pressing plate 4-6 is used for being placed on the T-shaped pressing plate, vertical downward force F 'is applied to the tool, and F2 is smaller than F' < F1. And unloading F' after the braking clearance distance D is moved downwards, detecting the actual displacement of the tool, and if the displacement is smaller than the D value, indicating that the positioning ring 4-7 is moved or the driving disc spring assembly 4-9 is pressed in place, judging that the adjustment is invalid and disassembling and checking are needed if the thrust is overlarge. And the yield of finished products is effectively improved in a pre-detection mode.
As shown in fig. 9, the parking brake unit 5 includes a parking piston 5-1, a parking push rod 5-2, a parking disc spring assembly 5-3 and a parking wear self-compensating device, the parking piston 5-1 and the parking push rod 5-2 are slidably sealed from left to right and arranged in a parking cavity, an annular groove is arranged at the left end of the parking piston 5-1, the parking disc spring assembly 5-3 is arranged in the annular groove, two ends of the parking disc spring assembly are abutted against the caliper body 1 and the parking piston 5-1, and in practical application, a proper adjusting pad is arranged between the parking disc spring assembly 5-3 and the parking piston 5-1 for adjusting the initial compression amount of the parking disc spring assembly 5-3 so as to adjust the parking braking force. The parking wear self-compensating device is positioned between the parking piston 5-1 and the parking push rod 5-2 and comprises a thrust ball bearing 5-4, a wear compensating ring 5-5, a copper pad 5-6 and a round nut 5-7 which are sequentially arranged from left to right. The left side of the inner ring of the parking piston 5-1 is provided with a step, the round nut 5-7 is fixedly arranged at the right end of the inner ring of the parking piston 5-1, and the right end face is flush with the right end face of the parking piston 5-1. A fixed gap is formed between the step and the round nut 5-7 and is used for placing the thrust ball bearing 5-4, the wear compensation ring 5-5 and the copper pad 5-6, and a gap is formed between the outer ring of the wear compensation ring 5-5 and the inner ring of the parking piston 5-1, so that the wear compensation ring 5-5 is coaxially and rotatably arranged on the inner ring of the parking piston 5-1 and is axially and fixedly arranged relative to the parking piston 5-1.
As shown in fig. 10, the inner ring of the wear compensation ring 5-5 is provided with a female thread, the outer ring of the parking push rod 5-2 is provided with a corresponding male thread, the section of the female thread is right trapezoid, the section of the male thread is right triangle, and in the initial state, a gap identical to the braking gap is arranged between two straight edges of the male thread and the female thread. When the straight edges of the female thread and the male thread are tightly attached, the abrasion compensation ring 5-5 cannot rotate due to self-locking, and further, no relative movement exists between the abrasion compensation ring 5-5 and the parking push rod 5-2, so that the friction plate 6 is propped up, and automatic compensation can be realized when abrasion occurs.
During parking braking, the parking piston 5-1 pushes the abrasion compensation ring 5-5 to move for a braking distance and then presses the parking push rod 5-2 tightly, at the moment, the right-angle sides of the threads are attached, and the friction plate 6 is pressed against, so that braking is realized. When the parking is released, the oil pressure pushes the parking piston 5-1 to reversely move left to stop after a braking gap, the abrasion compensation ring 5-5 is attached to the right side of the thrust ball bearing 5-4, and the disc spring force is completely counteracted by the oil pressure, so that only the abrasion compensation ring 5-5 is attached to the parking push rod 5-2, and no force is transmitted. The second sealing ring 5-8 is installed between the outer ring of the parking push rod 5-2 and the inner ring of the parking cavity in an interference manner, the second sealing ring 5-8 deforms in the parking brake compression process, and the parking push rod 5-2 is pressed back for a certain distance (the distance is small and can be ignored) to ensure that the friction plate 6 cannot generate dragging.
When the parking brake is applied after the friction plate 6 is subjected to delta wear, the parking piston 5-1 pushes the wear compensation ring 5-5 and the parking push rod 5-2 to move a braking gap distance, and then the parking piston continues to move forwards by delta distance. After the parking is released, the parking piston 5-1 and the wear compensating ring 5-5 need to continue to move leftward by a distance delta to completely return the parking piston 5-1. At this time, after the wear compensating ring 5-5 presses the parking pushrod 5-2, the wear compensating ring 5-5 is rotated and moved rightward with respect to the parking pushrod 5-2, thereby changing the initial relative positions of the parking pushrod 5-2 and the wear compensating ring 5-5. When the parking braking is performed again, the parking piston 5-1 and the abrasion compensation ring 5-5 still press the parking push rod 5-2 after moving a braking clearance distance, so that the consistent stroke of the parking piston 5-1 is ensured, the compression amount of the disc spring is always kept unchanged, the parking force is kept unchanged, and the effects of abrasion compensation and constant parking braking force are achieved.
The left end face of the parking push rod 5-2 is provided with a groove along the horizontal direction, the flexible return mechanism 7 comprises a guide rod 7-1 which is arranged in the groove and penetrates through the parking push rod 5-2, the right end of the guide rod 7-1 is fixedly connected with the friction plate 6, a return spring 7-2 which is sleeved on the guide rod 7-1 and precompressed is arranged between the left end and the parking push rod 5-2, the elastic force of the return spring 7-2 is smaller than the sealing force between the parking push rod 5-2 and the caliper body 1, the return force can be provided, and meanwhile, the guide rod 7-1 provides a certain guiding function for the movement of the friction plate 6, so that the parking brake is more stable. During parking braking, service braking or relieving is not affected, during parking relieving, when the service braking is carried out, the friction plate 6 pulls the return spring 7-2 to compress, but because the rigidity of the return spring 7-2 is small, the displacement is not large, and the interference compression deformation force of the second sealing ring 5-8 cannot be overcome, the parking push rod 5-2 is not moved, during driving relieving, the driving piston 4-1 automatically returns, the compressed return spring 7-2 is in a recovery free state, and the friction plate 6 is pulled back, so that flexible return is realized.
In order to protect the inner cavity, a first dust ring 12 is arranged between one side of the driving cavity, which is close to the friction plate 6, and the driving brake unit 4, and a second dust ring 13 is arranged between one side of the parking cavity, which is close to the friction plate 6, and the parking brake unit 5, so that the influence on the braking effect caused by unsmooth movement of the piston due to the fact that external dust or friction chips enter the cavity is avoided.
The brake of the embodiment has exquisite structure, adopts symmetrical structural design, does not need to consider left side or right side installation, has higher universality, can be completely interchanged, and has the advantages of completely leading two clamp bodies, reducing the types of parts and reducing the manufacturing cost. In addition, two pincers bodies are provided with independent driving pistons and parking pistons, abrasion self-compensation modules are designed in the pistons, the driving parking brake is ensured to be stable, braking force is constant, and the driving pistons and the parking pistons are not interfered with each other. Meanwhile, the running wear self-compensation module realizes modularized design, can be applied to other piston brakes, can perform pre-detection, changes the traditional press-fit mode, improves the overall performance, has small overall size, and is particularly suitable for occasions with limited space. The driving and parking abrasion self-compensating devices are arranged inside, so that the external interference of sediment, stone and the like is avoided, and the device is safe and reliable.
While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be had by the present invention, it should be understood that the foregoing description is merely illustrative of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the invention.