CN102155506A - Self-regulation clearance hydraulic drum-type front brake with temperature compensation function - Google Patents

Abstract

The invention discloses a self-regulation clearance hydraulic drum-type front brake with a temperature compensation function. The brake comprises a brake bottom plate, two self-regulation clearance brake sub-pump assemblies and two friction liner-containing brake shoe assemblies, wherein the two self-regulation clearance sub-pump assemblies are arranged on the left and right sides of the brake bottom plate symmetrically in a 180-DEG rotating way; the two friction liner-containing brake shoe assemblies are fixed on the brake bottom plate through a compression spring and a rivet; the fluted disc end of a piston of each sub-pump assembly is provided with an inner ring groove; a temperature compensation ring is arranged in the inner ring groove; and one end of the temperature compensation ring is contacted with the inner end face of a sub-pump shell. The brake has the advantages that: a brake clearance can be automatically regulated, overregulation phenomena generated by continuous and frequent braking are eliminated, the operational stroke of a pedal is reduced, the response time of the brake is shortened, double seal of a sub-pump piston is realized, the reliability and the durability of the seal are improved, and braking reliability and driving safety are improved.

Description

Self-regulated gap hydraulic drum front brake with temperature compensation function

[technical field] the present invention relates to auto parts machinery, relates to a kind of self-regulated gap hydraulic drum front brake with temperature compensation function particularly.

After long-time descending of [background technique] automobile hydraulic drum brake or the frequent continuously braking, the brake drum temperature raises, the drum internal diameter increases because of thermal expansion, and then produce " excessive gaps " that the thermal expansion by brake drum causes, have from the break of conditioning function and will adjust brake clearance automatically, brake clearance is controlled within the scope of setting value.When excessive gap surpassed the gap width of setting, the adjustment amount of self-adjustment structure also just met or exceeded the gap setting value.When brake drum is cooled to the normal temperature state, can be because of brake clearance too small or do not have the gap and produce that break is dawdled or locking, produce " toning " phenomenon.For fear of the generation of toning, all obtained greatlyyer set gap width usually, can strengthen pedal travel and hysteresis braking response time like this, braking ability is had a negative impact, even can influence traffic safety.

The brake cylinder of hydraulic brake only adopts y-type seal ring at present, when braking system is not worked, pipeline inner pressure is lower, the y-type seal ring of wheel cylinder only is in slight open configuration, have slightly at y-type seal ring under the situation of wearing and tearing, the low pressure seepage may occur, pollute the brake shoe friction surface, reduce braking force.

[summary of the invention] the invention provides a kind of self-regulated temperature compensation function, double sealing structure gap hydraulic drum front brake that has in order to address the above problem.

This self-regulated gap hydraulic drum front brake with temperature compensation function, comprise braking bottom board, two from adjust the play brake cylinder assembly and two brake shoe band friction facing assemblies, two are 180 ° from adjust the play wheel cylinder assembly and rotate the right and lefts that symmetry is installed in braking bottom board, be fixed with two brake shoe band friction facing assemblies by stage clip and blind rivet on the braking bottom board, disc one end of brake shoe band friction facing assembly stretches in the straight trough of piston adjusting screw rod, the other end stretches in the straight trough of wheel cylinder shell end, it is characterized in that, divide the fluted disc end of pump assembly piston to be provided with inner groove, the temperature correction ring is installed in the inner groove, and an end of temperature correction ring contacts with the interior edge face of branch pump case.

Be equipped with on the branch pump case and ship and resell on another market, be with the adjustment lever on shipping and reselling on another market, shipping and reselling on another market and adjusting is provided with holddown spring between the lever; Adjust the ratchet dish of an end of lever, flexibly connect by pin, adjust pull bar and flexibly connect, adjust the pull bar the other end and be stuck in the groove of piston crown by kidney slot and the set screw that is installed on the branch pump case with the end of adjusting pull bar near piston.

Be provided with groove apart from piston inner end 1/3rd places that divide pump assembly, be provided with the O RunddichtringO in the groove.

The temperature correction ring is installed between the interior edge face of the fluted disc right side of piston and branch pump case, the axial dimension of temperature correction ring expands and increases after being heated, piston is ejected a segment distance, make brake shoe open certain distance, thereby dwindle " excessive gaps " that the thermal expansion by brake drum forms; When this gap width that has dwindled during less than the setting value of self-adjustment structure, self-adjustment structure does not adjust, the compensation rate of appropriate design temperature compensation mechanism, when later brake clearance of compensation " excessive gaps " during still greater than the normal clearance setting value of self-regulated clearance mechanism, the self-regulated clearance mechanism can be adjusted its gap as usual.When the brake drum cooling, when brake clearance dwindles, temperature correction ring also Yin Wendu descends and axial dimension dwindles, piston is bounced back in brake cylinder under the effect of brake shoe return spring, brake shoe is retraction and then, gap between brake drum and the brake shoe is increased, thereby avoid brake drum to dawdle and the generation of locking phenomenon, also just prevent the generation of " toning " phenomenon.

When excessive gaps appearred in gasket wear, the piston motion stroke strengthened, and by adjusting pull bar the adjustment lever was rotated, and produced the moving tooth motion during piston return, adjusting screw rod is protracted, thereby dwindle brake clearance.

Divide pump assembly to adopt the structure of double seal piston to have two functions, the first is managed pressure when brakeless moves very low, and a small amount of seepage may appear in y-type seal ring, carries out secondary seal by the O RunddichtringO, has increased the reliability of leakage proof; It two is to form one section zone that has a small amount of brake fluid to exist between the two seals circle, and being in when making y-type seal ring work has lubricated state, can not produce dry friction, greatly prolongs the working life of y-type seal ring, improves the reliability and the durability of sealing.

Advantage of the present invention: realized the automatic adjustment of brake clearance, having improved break continuously, frequently brakes and forms " over control ", reduced the pedal working stroke, reduced the break response time, the double seal of wheelcylinder piston, improve the reliability and the durability of sealing, improved the reliability and the traffic safety of braking.

[description of drawings]

Fig. 1 is a structural representation of the present invention

Fig. 2 is the cut-away view from adjust the play wheel cylinder assembly of the present invention

Fig. 3 is the plan view from adjust the play wheel cylinder assembly of the present invention

Among the figure: 1, from adjust the play wheel cylinder assembly, 2, braking bottom board, 3, brake shoe band friction facing assembly, 4, adjusting screw rod, 5, adjust pull bar, 6, piston, 7, temperature correction ring, 8, holddown spring, 9, adjust lever, 10, ship and resell on anothermarket 11, the O RunddichtringO, 12, y-type seal ring, 13, divide pump case, 14, pin, 15, set screw, 16, straight trough, 17, inner groove, 18, groove.

[embodiment] is described as follows of the present invention below in conjunction with accompanying drawing:

In Fig. 1 and Fig. 2, two are 180 ° from adjust the play wheel cylinder assembly 1 and rotate the right and lefts that symmetry is installed in brakingbottom board 2, be fixed with two brake shoe bandfriction facing assemblies 3 by stage clip and blind rivet on thebraking bottom board 2, disc one end of brake shoe bandfriction facing assembly 3 stretches in the straight trough of adjustingscrew rod 4 ofpiston 6, the other end stretches in thestraight trough 16 ofbranch pump case 13 ends, the fluted disc end ofpiston 6 is provided withinner groove 17,temperature correction ring 7 is installed in theinner groove 17,temperature correction ring 7 is the manganese powders with 20-25%, the iron powder of 60-65%, the titanium valve of 5-10% and the silica flour of 5-10% are made, its optimum proportioning is a manganese powder 20%, iron powder 60%,titanium valve 10% andsilica flour 10%, an end oftemperature correction ring 7 contacts with the interior edge face ofbranch pump case 13.

Be equipped with on thebranch pump case 13 and ship and resell on anothermarket 10, ship and resell on another market to be with on 10 and adjustlever 9, ship and resell on anothermarket 10 withadjustment lever 9 between be provided withholddown spring 8; Adjust the ratchet dish of an end oflever 9 nearpiston 6, flexibly connect by pin 14 with the end of adjustingpull bar 5, adjustpull bar 5 and flexibly connect, adjustpull bar 5 the other ends and be stuck in the groove ofpiston 6 heads by kidney slot and the set screw 15 that is installed on thebranch pump case 13.

Be provided with y-type seal ring 12 in thepiston 6 of branch pump assembly 1, be provided withgroove 18, be provided with O RunddichtringO 11 in thegroove 18 apart frompiston 6 inner ends 1/3rd places that divide pump assembly 1.

Claims (3)

1. the self-regulated gap hydraulic drum front brake that has temperature compensation function, comprise braking bottom board, two from adjust the play brake cylinder assembly and two brake shoe band friction facing assemblies, two are 180 ° from adjust the play wheel cylinder assembly and rotate the right and lefts that symmetry is installed in braking bottom board, be fixed with two brake shoe band friction facing assemblies by stage clip and blind rivet on the braking bottom board, disc one end of brake shoe band friction facing assembly stretches in the straight trough of piston adjusting screw rod, the other end stretches in the straight trough of wheel cylinder shell end, it is characterized in that, divide the fluted disc end of pump assembly piston to be provided with inner groove, the temperature correction ring is installed in the inner groove, and an end of temperature correction ring contacts with the interior edge face of branch pump case.

2. the self-regulated gap hydraulic drum front brake with temperature compensation function according to claim 1 is characterized in that, is equipped with on the branch pump case and ships and resell on another market, and is with the adjustment lever on shipping and reselling on another market, and shipping and reselling on another market and adjusting is provided with holddown spring between the lever; Adjust the ratchet dish of an end of lever, flexibly connect by pin, adjust pull bar and flexibly connect, adjust the pull bar the other end and be stuck in the groove of piston crown by kidney slot and the set screw that is installed on the branch pump case with the end of adjusting pull bar near piston.

3. the self-regulated gap hydraulic drum front brake with temperature compensation function according to claim 1 is characterized in that, is provided with groove apart from piston inner end 1/3rd places that divide pump assembly, is provided with the O RunddichtringO in the groove.

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