技术领域technical field
本发明提供一种故障在线监测的汽车轮毂轴承单元及监测方法，属于汽车轮毂轴承单元技术领域。The invention provides an automobile hub bearing unit and a monitoring method for online fault monitoring, belonging to the technical field of automobile hub bearing units.
背景技术Background technique
与通用轴承相比较，轿车轮毂轴承单元是技术复杂程度相对较高的一类轴承。自1938年SKF公司制造的轮毂轴承单元问世以来，轮毂轴承单元就一直向着高载荷能力、结构紧凑、免维护、高可靠性以及轻量化方向发展。汽车整车厂对关键零部件的早期失效要求越来越严格。轮毂轴承单元早期失效的典型现象为出现异响、车轮晃动等，这些现象都是由于轮毂轴承单元的轴向游隙变动引起的，因此，研究轴向游隙对轿车轮毂轴承单元性能的影响很有意义。Compared with general-purpose bearings, car hub bearing units are a type of bearing with relatively high technical complexity. Since the wheel hub bearing unit manufactured by SKF came out in 1938, the wheel hub bearing unit has been developing in the direction of high load capacity, compact structure, maintenance-free, high reliability and light weight. Automobile OEMs have increasingly stringent requirements for early failure of key components. Typical phenomena of early failure of wheel hub bearing units are abnormal noise, wheel shake, etc. These phenomena are caused by changes in the axial clearance of the wheel hub bearing unit. Therefore, it is very important to study the influence of axial clearance on the performance of the car hub bearing unit. Significant.
轮毂轴承单元轴向游隙显著影响轴承内部的载荷分布和位移以及由内部接触载荷决定的疲劳寿命。为了获得更长的疲劳寿命并提高力矩刚性，必需对轮毂轴承单元施加合适的轴向预载荷，以使轴承在负的轴向游隙下工作，该游隙的合理性直接影响到轮毂轴承单元的工作寿命。当负游隙不够时，轮毂轴承单元在受载状态下容易松旷而形成振动；当负游隙过量时，造成滚道的接触应力过大而产生早期疲劳，这两种状态对轴承的寿命均不利。对于采用轴铆合实现预紧的轮毂轴承单元，在实施预紧前需确保轴承处于适当的原始轴向游隙并有效控制轴向预紧载荷。轮毂轴承单元处于一个合适的轴向负游隙时系统寿命最长,但随着轴向负游隙进一步增大(即轴向预载荷增大),疲劳寿命迅速降低。现有轮毂轴承单元轴向游隙测量方法：轮毂轴承单元法兰盘与底座配合，对外圈端面用加载头施加卸载力，所施加的力刚好使得拨模在一定的扭矩下能拨动内侧钢球，记录下此时卸载力，为装车件的卸载力，接下来可以通过程序设计计算出轮毂轴承单元轴向载荷和轴向游隙。该检测方法不能实现在线监测，且操作复杂，不能在车辆行驶中及时发现问题。The axial clearance of the hub bearing unit significantly affects the load distribution and displacement inside the bearing as well as the fatigue life determined by the internal contact load. In order to obtain longer fatigue life and improve moment rigidity, it is necessary to apply appropriate axial preload to the hub bearing unit so that the bearing can work under negative axial clearance, and the rationality of the clearance directly affects the hub bearing unit working life. When the negative clearance is not enough, the hub bearing unit is easy to loose and vibrate under load; when the negative clearance is excessive, the contact stress of the raceway is too large and early fatigue occurs. These two states have a great impact on the life of the bearing. Both are unfavorable. For hub bearing units that are preloaded by shaft riveting, it is necessary to ensure that the bearing is in an appropriate original axial clearance and effectively control the axial preload before preloading. The system life is the longest when the hub bearing unit is in a suitable axial negative clearance, but with the further increase of the axial negative clearance (that is, the increase of axial preload), the fatigue life decreases rapidly. The existing measurement method for the axial clearance of the hub bearing unit: the flange of the hub bearing unit is matched with the base, and the unloading force is applied by the loading head on the end face of the outer ring. Ball, record the unloading force at this time, which is the unloading force of the loading part, and then the axial load and axial clearance of the hub bearing unit can be calculated through programming. This detection method cannot realize online monitoring, and the operation is complicated, and problems cannot be found in time while the vehicle is running.
发明内容Contents of the invention
本发明为了解决现有技术中汽车轮毂轴承单元不能在线监测以及监测方法复杂难以操作且诊断结果不准确的缺陷和不足，提供了一种故障在线监测的汽车轮毂轴承单元及监测方法。In order to solve the defects and deficiencies in the prior art that the automobile hub bearing unit cannot be monitored on-line, the monitoring method is complicated and difficult to operate, and the diagnosis result is inaccurate, the invention provides an automobile hub bearing unit and a monitoring method for on-line fault monitoring.
为解决上述技术问题，本发明提供一种故障在线监测的汽车轮毂轴承单元，包括轮毂轴承单元以及故障监测系统；所述故障监测系统置于轮毂轴承单元前端的壳体内；In order to solve the above technical problems, the present invention provides an automobile hub bearing unit with online fault monitoring, including a hub bearing unit and a fault monitoring system; the fault monitoring system is placed in a housing at the front end of the hub bearing unit;
所述故障监测系统包括弹性膜片压力传感器、信号调节辅助电路、电子控制单元ECU、监测系统接插件、辅助电源及显示器，所述弹性膜片压力传感器安装在轮毂轴承单元的内圈和法兰内圈前端之间，用于采集内圈和法兰内圈之间的变形量、并转换为轮毂轴承单元的轴向载荷信号，信号调节辅助电路用于接收弹性膜片压力传感器采集的轴向载荷信号、进行调理滤波转换、并发送给电子控制单元ECU，电子控制单元ECU根据信号调节辅助电路发送的电信号进行故障判断，并根据设定的轮毂轴承单元轴向游隙与轴向载荷关系计算出轮毂轴承单元的轴向游隙值，所述监测系统接插件用于连接电子控制单元ECU和显示器，所述辅助电源用于向故障监测系统供电。The fault monitoring system includes an elastic diaphragm pressure sensor, a signal conditioning auxiliary circuit, an electronic control unit ECU, a monitoring system connector, an auxiliary power supply and a display, and the elastic diaphragm pressure sensor is installed on the inner ring and the flange of the hub bearing unit Between the front ends of the inner ring, it is used to collect the deformation between the inner ring and the inner ring of the flange, and convert it into the axial load signal of the hub bearing unit. The signal conditioning auxiliary circuit is used to receive the axial load signal collected by the elastic diaphragm pressure sensor. The load signal is adjusted, filtered and converted, and sent to the electronic control unit ECU. The electronic control unit ECU performs fault judgment according to the electrical signal sent by the signal adjustment auxiliary circuit, and according to the set relationship between the axial clearance of the hub bearing unit and the axial load The axial clearance value of the hub bearing unit is calculated, the monitoring system connector is used to connect the electronic control unit ECU and the display, and the auxiliary power supply is used to supply power to the fault monitoring system.
进一步，汽车轮毂轴承单元还包括ABS传感系统，所述ABS传感系统包括ABS传感器和磁极，所述ABS传感器安装在轮毂轴承单元的壳体内，若干个所述磁极均匀安装在铆合后的法兰内圈的前端外壁上，所述ABS传感器和所述磁极相互配合起到制动防抱死的作用。Further, the automobile hub bearing unit also includes an ABS sensing system, the ABS sensing system includes an ABS sensor and a magnetic pole, the ABS sensor is installed in the housing of the hub bearing unit, and several of the magnetic poles are evenly installed on the riveted On the outer wall of the front end of the flange inner ring, the ABS sensor and the magnetic pole cooperate with each other to play the role of anti-lock braking.
进一步，所述磁极共48个。Further, there are 48 magnetic poles in total.
进一步，所述轮毂轴承单元包括法兰内圈、法兰外圈、内圈、前保持架、后保持架、钢球、前密封圈、后密封圈、温度传感器及螺栓；所述法兰内圈和车轮轮毂由螺栓通过个螺栓孔连接，所述内圈套合在法兰内圈前端，与所述法兰外圈形成保持架通道A；所述前保持架安装在内圈与法兰外圈形成的环形凹槽中，所述后保持架安装在法兰外圈与法兰内圈形成的环形凹槽中；所述前保持架和后保持架都放置在保持架通道A中，且前保持架和后保持架中设有钢球。Further, the hub bearing unit includes a flange inner ring, a flange outer ring, an inner ring, a front cage, a rear cage, steel balls, a front sealing ring, a rear sealing ring, a temperature sensor and bolts; The ring and the wheel hub are connected by bolts through two bolt holes. The inner ring fits on the front end of the inner ring of the flange and forms a cage channel A with the outer ring of the flange; the front cage is installed on the inner ring and the outer flange In the annular groove formed by the ring, the rear cage is installed in the annular groove formed by the flange outer ring and the flange inner ring; the front cage and the rear cage are placed in the cage channel A, and Steel balls are arranged in the front cage and the rear cage.
进一步，所述法兰外圈的内壁设有温度传感器，用以监测保持架通道A中的温度。Further, the inner wall of the flange outer ring is provided with a temperature sensor for monitoring the temperature in the channel A of the cage.
本发明还提供一种汽车轮毂轴承单元的故障在线监测方法，步骤如下：The present invention also provides a method for on-line fault monitoring of an automobile hub bearing unit, the steps of which are as follows:
安装在轮毂轴承单元的内圈和法兰内圈前端之间的弹性膜片压力传感器采集内圈和法兰内圈之间的变形量，并转换得到轮毂轴承的轴向载荷信号；The elastic diaphragm pressure sensor installed between the inner ring of the hub bearing unit and the front end of the flange inner ring collects the deformation between the inner ring and the flange inner ring, and converts the axial load signal of the hub bearing;
信号调节辅助电路接收弹性膜片压力传感器采集的的轴向载荷信号进行调理滤波转换，然后发送给电子控制单元ECU；The signal adjustment auxiliary circuit receives the axial load signal collected by the elastic diaphragm pressure sensor, performs conditioning, filtering and conversion, and then sends it to the electronic control unit ECU;
电子控制单元ECU根据信号调节辅助电路发送的电信号进行故障判断，并根据设定的轮毂轴承单元轴向游隙与轴向载荷关系计算出轮毂轴承单元的轴向游隙值；The electronic control unit ECU performs fault judgment according to the electrical signal sent by the signal conditioning auxiliary circuit, and calculates the axial clearance value of the hub bearing unit according to the set relationship between the axial clearance of the hub bearing unit and the axial load;
根据故障形式对应的轴向游隙值及变化规律判断轮毂轴承单元对应的故障失效形式，然后设定轮毂轴承单元轴向游隙阈值，若轮毂轴承单元的轴向游隙值大于设定游隙阈值，则在显示器上显示故障码。According to the axial clearance value and change law corresponding to the fault form, judge the failure mode of the hub bearing unit corresponding to the failure, and then set the axial clearance threshold of the hub bearing unit. If the axial clearance value of the hub bearing unit is greater than the set clearance threshold, a fault code is displayed on the display.
进一步，轮毂轴承的轴向游隙值计算过程如下：Further, the calculation process of the axial clearance value of the hub bearing is as follows:
设施加在轮毂轴承单元的轴向载荷为Fa，内圈和法兰内圈之间产生的相对轴向位移为δa，接触角由α0变为α；The axial load applied to the hub bearing unit by the facility is Fa , the relative axial displacement between the inner ring and the inner ring of the flange is δa , and the contact angle changes from α0 to α;
轮毂轴承在自身的预紧力即轴向载荷Fa的作用下，满足如下方程：Under the action of its own pretightening force, that is, the axial load Fa , the hub bearing satisfies the following equation:
上式中：z—钢球颗数；Kn—载荷-位移常数；B—总曲率，B＝fi+fo-1；fi，fo—内、外圈沟曲率系数；D—钢球直径；In the above formula: z—number of steel balls; Kn —load-displacement constant; B—total curvature, B=fi +fo -1; fi , fo —curvature coefficient of inner and outer ring grooves; D— steel ball diameter;
在轴向载荷Fa的作用下，内列轴承产生的轴向位移为δai，外列轴承产生的轴向位移为δao，则：Under the action of axial load Fa , the axial displacement generated by the inner row bearing is δai , and the axial displacement generated by the outer row bearing is δao , then:
δai＝δao＝δa (3)δai = δao = δa (3)
由于外列轴承轴向被固定，所以外列轴承轴向位移与内列轴承叠加，即轮毂轴承单元的游隙值δ表示为：Since the outer row bearings are axially fixed, the axial displacement of the outer row bearings is superimposed on the inner row bearings, that is, the clearance value δ of the hub bearing unit is expressed as:
δ＝δai+δao＝2δa (4)δ＝δai +δao ＝2δa (4)
Fa由弹性膜片压力传感器测得，根据(2)式可得α，将α带入(1) 式，可得δa，由(4)式可得轮毂轴承单元轴向游隙值δ，从而根据轮毂轴承轴向载荷获得轴向游隙值。Fa is measured by the elastic diaphragm pressure sensor, α can be obtained according to the formula (2), and δa can be obtained by bringing α into the formula (1), and the axial clearance value of the hub bearing unit δ can be obtained from the formula (4) , so as to obtain the axial clearance value according to the axial load of the hub bearing.
本发明所达到的有益技术效果：Beneficial technical effect achieved by the present invention:
(1)结构简单易安装拆卸，可实时在线获得轮毂轴承单元工况(1) The structure is simple and easy to install and disassemble, and the working condition of the hub bearing unit can be obtained online in real time
(2)使用弹性膜片压力传感器可直接测量得到轮毂轴承单元轴向载荷，进一步获得对应的轮毂轴承单元轴向游隙，进而获得对应的轮毂轴承单元工况，监测可靠实用。(2) Using the elastic diaphragm pressure sensor can directly measure the axial load of the hub bearing unit, further obtain the corresponding axial clearance of the hub bearing unit, and then obtain the corresponding working condition of the hub bearing unit, and the monitoring is reliable and practical.
附图说明Description of drawings
图1本发明之轮毂轴承单元结构示意图；Fig. 1 wheel hub bearing unit structural representation of the present invention;
图2本发明之故障监测系统结构示意图；Fig. 2 structural representation of fault monitoring system of the present invention;
图3本发明之故障监测系统组成框图；Fig. 3 block diagram of fault monitoring system of the present invention;
图4本发明之在轴向载荷作用下外圈和法兰内圈轴向位移和接触角变化示意图。Fig. 4 is a schematic diagram of the axial displacement and contact angle change of the outer ring and the flange inner ring of the present invention under the action of axial load.
其中：1法兰内圈；2螺栓；3后密封圈；4法兰外圈；5温度传感器；6钢球；7前保持架；8前密封圈；9内圈；10弹性膜片压力传感器；11信号调节与辅助电路；12电子控制单元ECU；13监测系统接插件；14辅助电源；15 ABS传感器；16磁极；17壳体；18后保持架；A保持架通道。Among them: 1 flange inner ring; 2 bolts; 3 rear sealing ring; 4 flange outer ring; 5 temperature sensor; 6 steel ball; 7 front cage; 8 front sealing ring; 9 inner ring; 10 elastic diaphragm pressure sensor 11 Signal conditioning and auxiliary circuit; 12 Electronic control unit ECU; 13 Monitoring system connector; 14 Auxiliary power supply; 15 ABS sensor; 16 Magnetic pole; 17 Shell;
具体实施方式Detailed ways
下面结合具体实施例对本发明作进一步描述。以下实施例仅用于更加清楚地说明本发明的技术方案，而不能以此来限制本发明的保护范围。The present invention will be further described below in conjunction with specific embodiments. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
下面结合附图和实施例对本发明专利进一步说明。Below in conjunction with accompanying drawing and embodiment the patent of the present invention is further described.
如图1-3所示，本发明提供一种故障在线监测的汽车轮毂轴承单元，包括轮毂轴承单元、以及故障监测系统；所述故障监测系统置于轮毂轴承单元前端的壳体17内；As shown in Figures 1-3, the present invention provides an automobile wheel hub bearing unit with online fault monitoring, including a hub bearing unit and a fault monitoring system; the fault monitoring system is placed in the housing 17 at the front end of the hub bearing unit;
所述故障监测系统包括弹性膜片压力传感器10、信号调节辅助电路11、电子控制单元ECU 12、监测系统接插件13、辅助电源14及显示器，所述弹性膜片压力传感器10安装在轮毂轴承单元的内圈9和法兰内圈1前端之间，用于采集内圈9和法兰内圈1之间的变形量、并转换为轮毂轴承单元的轴向载荷信号，信号调节辅助电路11用于接收弹性膜片压力传感器10采集的轴向载荷信号、然后进行调理滤波转换、并发送给电子控制单元ECU 12，电子控制单元ECU12根据信号调节辅助电路11发送的电信号进行故障判断、并根据设定的轮毂轴承单元轴向游隙与轴向载荷关系计算出轮毂轴承单元的轴向游隙值，所述监测系统接插件13用于连接电子控制单元ECU 12和显示器，所述辅助电源用于向故障监测系统供电。The fault monitoring system includes an elastic diaphragm pressure sensor 10, a signal conditioning auxiliary circuit 11, an electronic control unit ECU 12, a monitoring system connector 13, an auxiliary power supply 14 and a display, and the elastic diaphragm pressure sensor 10 is installed on the hub bearing unit Between the inner ring 9 of the inner ring 9 and the front end of the flange inner ring 1, it is used to collect the deformation between the inner ring 9 and the flange inner ring 1, and convert it into the axial load signal of the hub bearing unit, and the signal adjustment auxiliary circuit 11 is used Receive the axial load signal collected by the elastic diaphragm pressure sensor 10, then perform conditioning, filtering and conversion, and send it to the electronic control unit ECU 12, the electronic control unit ECU 12 performs fault judgment according to the electrical signal sent by the signal adjustment auxiliary circuit 11, and Calculate the axial clearance value of the hub bearing unit based on the relationship between the axial clearance of the hub bearing unit and the axial load. The monitoring system connector 13 is used to connect the electronic control unit ECU 12 and the display. The auxiliary power supply is used to To supply power to the fault monitoring system.
汽车轮毂轴承单元还包括ABS传感系统，所述ABS传感系统包括ABS传感器15和磁极16，所述ABS传感器15安装在轮毂轴承单元的壳体17内，若干个所述磁极16均匀安装在铆合后的法兰内圈1的前端外壁上，所述ABS传感器15和所述磁极16相互配合起到制动防抱死的作用。所述磁极共48个。The automobile hub bearing unit also includes an ABS sensing system, and the ABS sensing system includes an ABS sensor 15 and a magnetic pole 16. The ABS sensor 15 is installed in the housing 17 of the hub bearing unit, and several of the magnetic poles 16 are uniformly installed on the On the front end outer wall of the flange inner ring 1 after riveting, the ABS sensor 15 and the magnetic pole 16 cooperate with each other to play the role of anti-lock braking. There are 48 magnetic poles in total.
所述轮毂轴承单元包括法兰内圈1、法兰外圈4、内圈9、前保持架7、后保持架18、钢球6、前密封圈8、后密封圈3、温度传感器5 及螺栓2；所述法兰内圈1和车轮轮毂由螺栓2通过个螺栓孔连接，所述内圈9套合在法兰内圈1前端，与所述法兰外圈4形成保持架通道A；所述前保持架7安装在内圈9与法兰外圈4形成的环形凹槽中，所述后保持架18安装在法兰外圈4与法兰内圈1形成的环形凹槽中；所述前保持架7和后保持架18都放置在保持架通道A中，且前保持架7和后保持架18中设有钢球。所述法兰外圈4的内壁设有温度传感器5，用以监测保持架通道A中的温度。The hub bearing unit includes flange inner ring 1, flange outer ring 4, inner ring 9, front cage 7, rear cage 18, steel ball 6, front sealing ring 8, rear sealing ring 3, temperature sensor 5 and Bolt 2; the flange inner ring 1 and the wheel hub are connected by bolts 2 through a bolt hole, the inner ring 9 fits on the front end of the flange inner ring 1, and forms a cage channel A with the flange outer ring 4 The front cage 7 is installed in the annular groove formed by the inner ring 9 and the flange outer ring 4, and the rear cage 18 is installed in the annular groove formed by the flange outer ring 4 and the flange inner ring 1 ; The front cage 7 and the rear cage 18 are placed in the cage channel A, and the front cage 7 and the rear cage 18 are provided with steel balls. The inner wall of the flange outer ring 4 is provided with a temperature sensor 5 for monitoring the temperature in the channel A of the cage.
本发明还提供一种汽车轮毂轴承单元的故障在线监测方法，The present invention also provides an online fault monitoring method for an automobile hub bearing unit,
安装在轮毂轴承单元的内圈和法兰内圈前端之间的弹性膜片压力传感器采集内圈和法兰内圈之间的变形量，并转换为轮毂轴承单元的轴向载荷信号；The elastic diaphragm pressure sensor installed between the inner ring of the hub bearing unit and the front end of the flange inner ring collects the deformation between the inner ring and the flange inner ring, and converts it into an axial load signal of the hub bearing unit;
信号调节辅助电路接收弹性膜片压力传感器采集的轴向载荷信号进行调理滤波转换，然后发送给电子控制单元ECU；The signal adjustment auxiliary circuit receives the axial load signal collected by the elastic diaphragm pressure sensor, performs conditioning, filtering and conversion, and then sends it to the electronic control unit ECU;
电子控制单元ECU根据信号调节辅助电路发送的电信号进行故障判断、并根据设定的轮毂轴承单元轴向游隙与轴向载荷关系计算出轮毂轴承单元的轴向游隙值；The electronic control unit ECU performs fault judgment according to the electrical signal sent by the signal conditioning auxiliary circuit, and calculates the axial clearance value of the hub bearing unit according to the set relationship between the axial clearance of the hub bearing unit and the axial load;
根据故障形式对应的轴向游隙值及变化规律判断轮毂轴承单元对应的故障失效形式，设定轮毂轴承单元轴向游隙阈值，若轮毂轴承单元的轴向游隙值大于设定游隙阈值，则在显示器上显示故障码。Judging the failure mode of the hub bearing unit corresponding to the axial clearance value and the change law corresponding to the fault form, and setting the axial clearance threshold of the hub bearing unit, if the axial clearance value of the hub bearing unit is greater than the set clearance threshold , the fault code will be displayed on the display.
其中，轮毂轴承的轴向游隙值计算过程如下：Among them, the calculation process of the axial clearance value of the hub bearing is as follows:
设施加在轮毂轴承单元的轴向载荷为Fa，内圈和法兰内圈之间产生的相对轴向位移为δa，接触角由α0变为α；The axial load applied to the hub bearing unit by the facility is Fa , the relative axial displacement between the inner ring and the inner ring of the flange is δa , and the contact angle changes from α0 to α;
轮毂轴承在自身的预紧力即轴向载荷Fa的作用下，满足如下方程：Under the action of its own pretightening force, that is, the axial load Fa , the hub bearing satisfies the following equation:
上式中：z—钢球颗数；Kn—载荷-位移常数；B—总曲率，B＝fi+fo-1；fi，fo—内、外圈沟曲率系数；D—钢球直径。In the above formula: z—number of steel balls; Kn —load-displacement constant; B—total curvature, B=fi +fo -1; fi , fo —curvature coefficient of inner and outer ring grooves; D— steel ball diameter.
在轴向载荷Fa的作用下，内列轴承产生的轴向位移为δai，外列轴承产生的轴向位移为δao，则：Under the action of axial load Fa , the axial displacement generated by the inner row bearing is δai , and the axial displacement generated by the outer row bearing is δao , then:
δai＝δao＝δa (3)δai = δao = δa (3)
由于外列轴承轴向被固定，所以外列轴承轴向位移与内列轴承叠加，即轮毂轴承单元的游隙值δ表示为：Since the outer row bearings are axially fixed, the axial displacement of the outer row bearings is superimposed on the inner row bearings, that is, the clearance value δ of the hub bearing unit is expressed as:
δ＝δai+δao＝2δa (4)δ＝δai +δao ＝2δa (4)
Fa由弹性膜片压力传感器测得，根据(2)式可得α，将α带入(1)式，可得δa，由(4)式可得轮毂轴承单元轴向游隙值δ，从而根据轮毂轴承轴向载荷计算得到轴向游隙值。Fa is measured by the elastic diaphragm pressure sensor, α can be obtained according to formula (2), and δa can be obtained by bringing α into formula (1), and the axial clearance value of the hub bearing unit δ can be obtained from formula (4) , so as to calculate the axial clearance value according to the axial load of the hub bearing.
以上已以较佳实施例公布了本发明，然其并非用以限制本发明，凡采取等同替换或等效变换的方案所获得的技术方案，均落在本发明的保护范围内。The present invention has been disclosed above with preferred embodiments, but it is not intended to limit the present invention. All technical solutions obtained by adopting equivalent replacement or equivalent transformation schemes fall within the protection scope of the present invention.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710455324.8ACN107061483B (en) | 2017-06-16 | 2017-06-16 | Automobile wheel hub bearing unit and monitoring method for on-line fault monitoring |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710455324.8ACN107061483B (en) | 2017-06-16 | 2017-06-16 | Automobile wheel hub bearing unit and monitoring method for on-line fault monitoring |
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| CN107061483A CN107061483A (en) | 2017-08-18 |
| CN107061483Btrue CN107061483B (en) | 2019-08-27 |
| Application Number | Title | Priority Date | Filing Date |
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| CN201710455324.8AActiveCN107061483B (en) | 2017-06-16 | 2017-06-16 | Automobile wheel hub bearing unit and monitoring method for on-line fault monitoring |
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