Tool for detecting hub unit by adding pretightening force and detection method

Abstract

The invention discloses a tool for detecting a hub unit by adding pretightening force and a detection method, the tool for detecting the hub unit by adding the pretightening force is detachably and fixedly connected with the hub unit, and the tool comprises an inner bearing limiting baffle plate, an outer bearing limiting baffle plate and a fixed connection assembly, the inner bearing limiting baffle comprises a first bearing blocking table spigot and at least two first avoiding areas for avoiding the measuring probe, the first bearing blocking table spigot is connected with an inner hole of the inner bearing in an inserted mode, and the spigot end face is attached to the inner end face of an inner ring of the inner bearing. The outer bearing limiting baffle comprises a second bearing blocking table spigot and at least two second avoiding areas for avoiding the measuring probe, the second bearing blocking table spigot is connected with an inner hole of the outer bearing in an inserted mode, the spigot end face is attached to the outer end face of an inner ring of the outer bearing, and the inner bearing limiting baffle and the outer bearing limiting baffle are limited and fixedly connected through the fixed connecting assembly. The detection tool can apply pre-tightening force to the inner bearing and the outer bearing and correct the inner bearing and the outer bearing so as to ensure that the detection of the hub unit is qualified.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hub unit detection, in particular to a tool and a detection method for detecting a hub unit with added pre-tightening force. BACKGROUND

[0002] During the assembly of the hub unit by the manufacturer, the inner bearing, the outer bearing and the oil seal assembly are pressed into the inner cavity of the hub. After assembly, the detection parts of the hub unit are inspected, and only after the inspection is qualified, the hub unit can be shipped. Figures 1 to 3 As shown in the figure, the detection of the detection parts of the hub unit mainly includes: first oil seal 204 jump test, second oil seal 205 jump test, brake drum connecting thread hole 206 position degree test, half shaft thread hole f position degree test, flange outer periphery d concentricity test, flange end surface e full jump, wheel bolt c position degree test, brake drum stop a jump test, rim stop b jump test, ABS ring end surface h jump and hub outer end surface m jump, etc. The detection of these detection parts is based on the center axis of the hub unit. After the inner bearing 202, the outer bearing 203 and the oil seal assembly are pressed onto the hub, the inner bearing 202 and the outer bearing 203 are in a free state under no external pressure, the inner ring end surface of the inner bearing 202 and the inner ring end surface of the outer bearing 203 are not in contact, and there is a gap L between them.

[0003] During the transportation of the hub unit, due to various reasons such as vehicle bumping, the position of the inner bearing and the outer bearing will be inclined, that is, the axis of the inner bearing and the axis of the outer bearing will be changed, which will cause the deviation of the axes of the two bearings from the center line of the hub, and thus the center axis (detection reference) of the hub unit will be changed. Therefore, when the detection of the detection parts of the hub unit is performed at the customer end, the detection may not be qualified, which will cause the customer to judge that the product is unqualified and thus cause quality complaints.

[0004] In order to ensure that the customer end detects the hub unit to be qualified, a tool and a detection method for detecting a hub unit with added pre-tightening force are developed and designed. SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is to provide a tool for detecting a hub unit with added pre-tightening force, which can apply pre-tightening force to the inner bearing and the outer bearing of the hub unit, and then adjust and align the axes of the inner bearing and the outer bearing, so that the axes of the two bearings coincide with the center line of the inner cavity of the hub, to ensure that the hub unit is qualified.

[0006] To solve the above technical problems, the technical scheme of the present application is:

[0007] A tool for adding a pre-tightening force detection hub unit, detachably fixedly connected with the hub unit, the hub unit comprising a hub body, an inner bearing, an outer bearing and an oil seal assembly fixedly installed in the inner cavity of the hub body,

[0008] The tool for adding a pre-tightening force detection hub unit comprises an inner bearing limiting baffle, an outer bearing limiting baffle and a fixed connection assembly, the inner bearing limiting baffle comprising a first bearing stop and at least two first avoidance zones for avoiding measurement probes, the first bearing stop being inserted into the inner hole at the inner end of the inner bearing, the end face of the first bearing stop abutting against the inner end face of the inner ring of the inner bearing,

[0009] The outer bearing limiting baffle comprises a second bearing stop and at least two second avoidance zones for avoiding measurement probes, the second bearing stop being inserted into the inner hole at the outer end of the outer bearing, the end face of the second bearing stop abutting against the outer end face of the inner ring of the outer bearing,

[0010] The fixed connection assembly limits and fixedly connects the inner bearing limiting baffle and the outer bearing limiting baffle.

[0011] Preferably, the fixed connection assembly comprises a connecting rod and a limiting fixing piece, the head of the connecting rod being provided with a limiting head, the connecting rod being detachably fixedly connected with the limiting fixing piece through the inner bearing limiting baffle and the outer bearing limiting baffle, the limiting head limiting the axial displacement of the inner bearing limiting baffle, and the limiting fixing piece limiting the axial displacement of the outer bearing limiting baffle.

[0012] Preferably, when the connecting rod and the limiting fixing piece cooperate to limit and fixedly connect the inner bearing limiting baffle and the outer bearing limiting baffle, the first avoidance zones correspond to the second avoidance zones one by one.

[0013] Preferably, the inner bearing limiting baffle comprises three first claw arms and a first claw arm connecting portion, the inner ends of the first claw arms being connected with the first claw arm connecting portion, the three first claw arms being arranged in a circumferential array around the center of the first claw arm connecting portion, and the first avoidance zones being formed between adjacent two first claw arms.

[0014] Preferably, the outer bearing limiting baffle comprises three second claw arms and a second claw arm connecting portion, the inner ends of the second claw arms being connected with the second claw arm connecting portion, the three second claw arms being arranged in a circumferential array around the center of the second claw arm connecting portion, and the second avoidance zones being formed between adjacent two second claw arms.

[0015] Preferably, the outer ends of the three first claw arms are provided with first claw arm outer circumferential surfaces, the diameter of the first claw arm outer circumferential surfaces is not more than the maximum diameter of the inner bearing inner ring, and the outer ends of the three second claw arms are provided with second claw arm outer circumferential surfaces, the diameter of the second claw arm outer circumferential surfaces is not more than the maximum diameter of the outer bearing inner ring.

[0016] Preferably, the connecting rod is a bolt, the limiting fixing member is a nut, the rod portion of the bolt is connected with the inner bearing limiting baffle by a key, and a rotation-preventing positioning structure is arranged between the rod portion of the bolt and the outer bearing limiting baffle.

[0017] Preferably, the outer bearing limiting baffle is provided with an installation hole matched with the rod portion of the bolt, and the rotation-preventing positioning structure comprises a rotation-preventing positioning plane arranged on the rod portion of the bolt and a rotation-preventing platform arranged on the installation hole.

[0018] Preferably, the connecting rod is a prismatic connecting rod, and the limiting fixing member is a nut or a clamping spring.

[0019] Based on the same inventive concept, a second technical problem to be solved by the present application is to provide a detection method of a wheel hub unit, and the above-mentioned tooling for detecting the wheel hub unit with pre-tightening force is assembled with the wheel hub unit, so that the axes of the inner bearing and the outer bearing can be adjusted and aligned, and the axes of the two bearings are ensured to coincide with the center line of the wheel hub inner cavity, thereby ensuring that the detection of the wheel hub unit is qualified.

[0020] To solve the above-mentioned second technical problem, the technical scheme of the present application is as follows:

[0021] A detection method of a wheel hub unit based on the above-mentioned tooling for detecting the wheel hub unit with pre-tightening force, the detection method comprising the following steps:

[0022] a. The connecting rod is inserted into the installation hole of the inner bearing limiting baffle, the inner bearing limiting baffle with the connecting rod is inserted into the inner hole at the inner end of the inner bearing, and the end face of the first bearing stop platform stop is abutted against the inner end face of the inner bearing inner ring;

[0023] b. The outer bearing limiting baffle is sleeved on the connecting rod, and the first avoiding area and the second avoiding area are one-to-one corresponding;

[0024] c. The outer bearing limiting baffle is inserted into the inner hole at the outer end of the outer bearing, and the end face of the second bearing stop platform stop is abutted against the outer end face of the outer bearing inner ring;

[0025] d. The limiting fixing member is assembled on the connecting rod, and the limiting fixing member is located at the outer end of the outer bearing limiting baffle;

[0026] e. Place the hub unit on the support seat, make the hub unit flange plate parallel to the horizontal plane, press the outer bearing limiting baffle, make the hub body rotate forward for three circles and reverse for three circles, and ensure that the inner bearing and the outer bearing are adjusted in place;

[0027] f. After the tool for adding the pre-tightening force detection hub unit is assembled on the hub unit according to the above steps, the flange plate of the hub unit is clamped by a clamping tool, and the flange plate of the hub unit is perpendicular to the horizontal plane when clamping;

[0028] g. The detection equipment is used to detect the to-be-detected part of the hub unit.

[0029] After the above technical scheme is adopted, the application has the following beneficial effects:

[0030] The application discloses a tool for adding a pre-tightening force detection hub unit, which is detachably connected with the hub unit. The tool for adding the pre-tightening force detection hub unit comprises an inner bearing limiting baffle, an outer bearing limiting baffle and a fixed connection assembly. The inner bearing limiting baffle comprises a first bearing stopper and at least two first avoiding zones for avoiding measurement probes. The first bearing stopper is inserted into an inner hole at an inner end of the inner bearing. An end face of the first bearing stopper is in abutment with an inner end face of an inner ring of the inner bearing. The outer bearing limiting baffle comprises a second bearing stopper and at least two second avoiding zones for avoiding measurement probes. The second bearing stopper is inserted into an inner hole at an outer end of the outer bearing. An end face of the second bearing stopper is in abutment with an outer end face of an inner ring of the outer bearing. The tool for adding the pre-tightening force detection hub unit applies pre-tightening force to the inner bearing and the outer bearing of the hub unit, so that the free gap between the two bearings disappears, and the two end faces of the inner bearing and the outer bearing are in abutment with each other. The tool simulates the stress state of the hub unit in actual operation, so as to correct and adjust the positions and inclination states of the inner bearing and the outer bearing, avoid the axial inclination of the two bearings, and make the axial lines of the two bearings coincide with the center line of the hub inner cavity, so as to ensure that the hub unit is qualified.

[0031] When the hub unit is transported to the client for detection, the tool for adding the pre-tightening force detection hub unit is installed on the hub unit, which is used for correcting the hub unit. When the to-be-detected part of the hub unit is detected again, it can be ensured that the hub unit is still qualified, and the hub unit can be avoided to be judged unqualified by the client, and the quality claim of the client can be avoided.

[0032] In the present application, the inner bearing limiting baffle includes three first claw arms and a first claw arm connecting portion, and a first avoiding area is formed between two adjacent first claw arms. The outer bearing limiting baffle includes three second claw arms and a second claw arm connecting portion, and the inner end of the second claw arm is connected to the second claw arm connecting portion, and a second avoiding area is formed between two adjacent second claw arms. When the connecting rod cooperates with the limiting fixing member to limit and fix the inner bearing limiting baffle and the outer bearing limiting baffle, the first avoiding area and the second avoiding area correspond to each other. On the one hand, when the inner bearing limiting baffle is assembled, each first claw arm uniformly applies force to the inner end surface of the inner bearing, that is, the bearing unit can be uniformly stressed, and the first avoiding area between two adjacent first claw arms has a large space, which facilitates the movement of the probe during detection. On the other hand, the inner bearing limiting baffle is convenient to process, and after the three claw arms are processed, the first avoiding area is directly formed between two adjacent first claw arms, without the need for separate punching. In addition, compared with the avoiding area formed on the disc, the present application saves materials. The outer bearing limiting baffle is provided in a three-claw structure, and has the same advantages as the above-mentioned inner bearing limiting baffle provided in a three-claw structure.

[0033] In summary, the tool for adding the pre-tightening force detection hub unit of the present application applies pre-tightening force to the inner bearing and the outer bearing of the hub unit, can correct and adjust the position and inclination state of the inner and outer bearings, avoids the inclination of the two bearing axes, and makes the axes of the two bearings coincide with the center line of the hub inner cavity, so as to ensure that the customer detects the hub unit to be qualified. Moreover, the tool is easy to process and has low cost. BRIEF DESCRIPTION OF DRAWINGS

[0034] The present application will be further described below in combination with the drawings and examples.

[0035] Figure 1 is a structural schematic view of a hub unit;

[0036] Figure 2 is Figure 1 is a sectional view of the hub unit at A-A;

[0037] Figure 3 is Figure 2 is an enlarged structural schematic view of O;

[0038] Figure 4 is a structural schematic view of the tool for adding the pre-tightening force detection hub unit of example one and the hub unit after assembly;

[0039] Figure 5 is Figure 4 is a sectional view of the tool and the hub unit after assembly at B-B;

[0040] Figure 6 is a structural schematic view of the tool for adding the pre-tightening force detection hub unit of example one;

[0041] Figure 7is the structural schematic diagram of the tool of the embodiment one of the application additionally provided with the pre-tightening force detection wheel hub unit from another angle;

[0042] Figure 8 is the structural schematic diagram of the inner bearing limiting baffle and bolt installation of the tool of the embodiment one of the application additionally provided with the pre-tightening force detection wheel hub unit;

[0043] Figure 9 is Figure 8 the sectional view at C-C;

[0044] Figure 10 is the three-dimensional structural schematic diagram of the tool of the embodiment one of the application additionally provided with the pre-tightening force detection wheel hub unit and the wheel hub unit after assembly;

[0045] Figure 11 is the three-dimensional structural schematic diagram of the tool of the embodiment one of the application additionally provided with the pre-tightening force detection wheel hub unit and the wheel hub unit after assembly from another angle;

[0046] Figure 12 is the schematic diagram of the tool of the embodiment one of the application additionally provided with the pre-tightening force detection wheel hub unit after assembly and horizontal placement;

[0047] Figure 13 is the structural schematic diagram of the tool of the embodiment two of the application additionally provided with the pre-tightening force detection wheel hub unit;

[0048] Figure 14 is the structural schematic diagram of the tool of the embodiment three of the application additionally provided with the pre-tightening force detection wheel hub unit;

[0049] a, brake drum stop; b, rim stop; c, wheel bolt; d, flange outer peripheral surface; e, flange end surface; f, half shaft threaded hole; h, ABS ring gear end surface; L, gap; m, wheel hub outer end surface; 1, inner bearing limiting baffle; 101, first avoiding area; 102, first bearing stop; 102a, stop end surface of the first bearing stop; 103, first claw arm; 1030, outer peripheral surface of the first claw arm; 103a, first claw arm with groove; 104, first claw arm connecting part; 2, wheel hub unit; 201, wheel hub body; 202, inner bearing; 203, outer bearing; 204, first oil seal; 205, second oil seal; 206, brake drum connecting threaded hole; 3, outer bearing limiting baffle; 301, second avoiding area; 301a, stop end surface of the second bearing stop; 302, second bearing stop; 303, second claw arm; 3030, outer peripheral surface of the second claw arm; 304, second claw arm connecting part; 3041, second mounting hole; 4, bolt; 4a, anti-rotation positioning plane; 5, nut; 6, key; 7, prismatic connecting rod; 8, clamping spring. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0051] It should be noted that the "inner bearing" and "outer bearing" of the hub unit in the present application are named according to the direction when the hub unit is installed on the vehicle. Taking an example of two hub units each installed at the two ends of the same axle, when the axle is installed under the vehicle compartment, the area of the vehicle compartment between the two wheels is "inner", and the direction outside the vehicle compartment is "outer". After each hub unit is installed on the axle, one end faces "inner" and the other end faces "outer", the bearing at the inner end of the hub unit is named "inner bearing", and the bearing at the outer end of the hub unit is named "outer bearing".

[0052] Example 1

[0053] As shown in Figures 1 to 5 The present application includes an additional pre-tightening force detection hub unit tool, which is detachably fixedly connected with the hub unit 2. The hub unit 2 includes a hub body 201, and the inner cavity of the hub body 201 is fixedly installed with an inner bearing 202, an outer bearing 203 and an oil seal assembly. The oil seal assembly includes a first oil seal 204 and a second oil seal 205. The two ends of the inner ring of the inner bearing 202 adjacent to the inner ring of the outer bearing 203 are fixedly connected, and the two ends of the inner ring of the inner bearing 202 adjacent to the inner ring of the outer bearing 203 are generally fixedly connected by a circlip. The first oil seal 204 is located on the inner side of the outer ring of the inner bearing 202, and the second oil seal 205 is located on the outer side of the outer ring of the outer bearing 203.

[0054] Of course, the structure of the hub unit can also be other structures. For example, the hub unit includes a hub body, and the inner cavity of the hub body is fixedly installed with an inner bearing, an outer bearing and an oil seal. The oil seal is located on the inner side of the outer ring of the inner bearing, and a spacer is installed between the inner bearing and the outer bearing, and the two ends of the spacer abut against the outer end face of the inner ring of the inner bearing and the inner end face of the inner ring of the outer bearing, respectively.

[0055] As shown in Figures 4 to 7As shown, the fixture for adding a preload detection hub unit includes an inner bearing limiting baffle 1, an outer bearing limiting baffle 3, and a fixed connection assembly. The inner bearing limiting baffle 1 includes a first bearing stop 102 and at least two first clearance areas 101 for avoiding the measuring probe. The first bearing stop 102 is inserted into the inner hole at the inner end of the inner bearing 202, and the stop end face 102a of the first bearing stop abuts against the inner end face of the inner ring of the inner bearing 202. The outer bearing limiting baffle 3 includes a second bearing stop 302 and at least two second clearance areas 301 for avoiding the measuring probe. The second bearing stop 302 is inserted into the inner hole at the outer end of the outer bearing 203, and the stop end face 301a of the second bearing stop abuts against the outer end face of the inner ring of the outer bearing 203. The fixed connection assembly limits and fixes the inner bearing limiting baffle 1 and the outer bearing limiting baffle 3.

[0056] The fixed connection assembly includes a connecting rod and a limiting fastener. The head of the connecting rod has a limiting stop. The connecting rod passes through the inner bearing limiting baffle 1 and the outer bearing limiting baffle 3 and is detachably fixed to the limiting fastener. The limiting stop limits the axial displacement of the inner bearing limiting baffle, and the limiting fastener limits the axial displacement of the outer bearing limiting baffle 1. When the connecting rod and the limiting fastener cooperate to limit and fix the inner bearing limiting baffle 1 and the outer bearing limiting baffle 3, the first clearance area 101 corresponds one-to-one with the second clearance area 301. This greatly simplifies the measurement procedure when using a coordinate measuring machine.

[0057] In some embodiments, such as Figures 6 to 9 As shown, the connecting rod is preferably set as bolt 4, and the limiting and fixing component is nut 5. The shank of bolt 4 is keyed to the inner bearing limiting baffle 1, and an anti-rotation positioning structure is provided between the shank of bolt 4 and the outer bearing limiting baffle 3 near the tail end. The shank of bolt 4 passes through the inner bearing limiting baffle 1 and the outer bearing limiting baffle 3 and is threaded to nut 5. The shank of bolt 4 is also keyed to the inner bearing limiting baffle 1. When nut 5 is tightened, each first clearance area 101 corresponds one-to-one with each second clearance area 301.

[0058] For example, when using a coordinate measuring machine (CMM), the measuring probe needs to extend into the inner cavity of the wheel hub and the inner holes of the two bearings to take multiple points to determine the center of the circle at a specific location in the inner cavity and the center of the circles at the two bearing inner holes. To determine the center, the CMM probe first needs to take multiple points (sometimes 5-9 points, sometimes more) to fit a circular plane before determining the center. Therefore, a clearance zone for the CMM measuring probe needs to be provided on the fixture for adding a preload detection wheel hub unit.

[0059] When measuring the center of the inner bearing, the three-coordinate measuring probe usually needs to take 5-9 points to fit into a circular plane, and the center of the inner bearing is determined by fitting the circular plane. In order to make the position error of the center of the inner bearing small, the points are usually taken as far as possible without concentrating in one area, so at least two first avoidance zones 101 are designed to avoid the three-coordinate measuring probe. Similarly, when measuring the center of the outer bearing, at least two second avoidance zones 301 are usually designed to avoid the three-coordinate measuring probe.

[0060] As shown in Figure 6 and Figure 7 When machining the inner bearing limiting baffle 1, the runout of the stop end face 102a of the first bearing stop is strictly required. When machining the outer bearing limiting baffle 3, the runout of the stop end face 301a of the second bearing stop is strictly required. The second bearing stop 302 of the outer bearing limiting baffle 3 and the first bearing stop 102 of the inner bearing limiting baffle 1 are used to cooperate to adjust the center position of the inner bearing and the outer bearing, avoid the center deflection of the inner bearing and the outer bearing, and facilitate the guidance and fixation during the installation of the tooling.

[0061] In some embodiments, the inner bearing limiting baffle 1 preferably includes three first claw arms 103 and a first claw arm connecting part 104, the inner ends of the three first claw arms 103 are connected to the first claw arm connecting part 104, the three first claw arms 103 are arranged in a circular array around the center of the first claw arm connecting part 104, and the first avoidance zone 101 is between the adjacent two first claw arms 103. The outer ends of the three first claw arms 103 are provided with a first claw arm outer circumferential surface 1030, and the diameter size of the first claw arm outer circumferential surface 1030 does not exceed the maximum diameter size of the inner ring of the inner bearing 202. This design facilitates the assembly of the outer bearing limiting baffle 3. When assembling the outer bearing limiting baffle 3, the outer bearing limiting baffle 3 can be prevented from interfering with the second oil seal 205 when force is applied to the outer bearing limiting baffle 3.

[0062] In some embodiments, the outer bearing limiting baffle 3 preferably includes three second claw arms 303 and a second claw arm connecting part 304, the inner ends of the three second claw arms 303 are connected to the second claw arm connecting part 304, the three second claw arms 303 are arranged in a circular array around the center of the second claw arm connecting part 304, and the second avoidance zone 301 is between the adjacent two second claw arms 303. This structure of uniformly distributing the three second claw arms 303 facilitates machining and greatly simplifies the measurement procedure.

[0063] Of course, the three second claw arms 303 can also be unevenly distributed, but this will increase the difficulty of machining and increase the steps during measurement.

[0064] The outer ends of the three second claw arms 303 are provided with second claw arm outer circumferential surfaces 3030, and the diameter of the second claw arm outer circumferential surfaces 3030 is not greater than the maximum diameter of the inner ring of the outer bearing 203. This design facilitates the assembly of the inner bearing limiting baffle 1. When the inner bearing limiting baffle 1 is assembled and force is applied to the inner bearing limiting baffle 1, the inner bearing limiting baffle 1 can avoid interfering with the first oil seal 204.

[0065] Specifically, the first claw arm connecting portion 104 is provided with a claw arm key groove and a first mounting hole through which the shank of the bolt 4 passes, the claw arm key groove communicates with the first mounting hole and corresponds to one of the first claw arms 103, such as Figure 5 The middle claw arm key groove corresponds to the counter-bore first claw arm 103a, and the middle line of the middle claw arm key groove is preferably coincident with the middle line of the counter-bore first claw arm 103a, so that the position of the counter-bore first claw arm 103a is convenient to confirm during machining and detection. The shank of the bolt 4 is provided with a shank key groove corresponding to the claw arm key groove, and the key 6 is mounted in the claw arm key groove and the shank key groove to fixedly connect the shank of the bolt with the inner bearing limiting baffle 1. After the nut 5 is tightened, each first claw arm 103 corresponds to each second claw arm 303.

[0066] The outer bearing limiting baffle 3 is provided with a mounting hole corresponding to the shank of the bolt 4, and the anti-rotation positioning structure includes an anti-rotation positioning plane provided on the shank of the bolt 4 and an anti-rotation platform provided at the mounting hole. Specifically, the shank of the bolt 4 is provided with an anti-rotation positioning plane 4a near the tail end, the middle line of the anti-rotation positioning plane 4a is collinear with the middle line of the shank key groove, the middle part of the second claw arm connecting portion 304 is provided with a second mounting hole 3041, the second mounting hole has an anti-rotation platform, and the second mounting hole 3041 is matched with the shank at the anti-rotation positioning plane 4a. The anti-rotation positioning plane 4a is obtained by milling a plane during machining. The anti-rotation platform of the second mounting hole corresponds to one of the second claw arms 303. After the nut 5 is tightened, the shank of the bolt 4 passing through the second mounting hole can prevent the bolt 4 and the outer bearing limiting baffle 3 from rotating relative to each other.

[0067] The inner bearing limiting baffle 1 is provided in a three-claw structure, which has the following advantages. On the one hand, when the inner bearing limiting baffle 1 is assembled, each first claw arm 103 uniformly applies force to the inner end surface of the inner bearing, so that the bearing unit is uniformly stressed, and the first avoidance area 101 between adjacent two first claw arms 103 has a large space, which facilitates the movement of the probe during three-coordinate detection. On the other hand, the inner bearing limiting baffle 1 is convenient to process, and after the three claw arms are processed, the first avoidance area 101 is directly formed between adjacent two first claw arms 103, without the need for separate punching. In addition, compared with the avoidance area provided on the disc, the three-claw structure saves materials.

[0068] When the tool for adding the pre-tightening force detection hub unit is assembled with the hub unit, the position of the anti-rotation positioning plane 4a can be adjusted so that the three second claw arms 303 of the outer bearing limiting baffle 3 are in one-to-one correspondence with the three first claw arms 103 of the inner bearing limiting baffle 1. After the two are correspondingly installed, it is more convenient for subsequent programming when using three-coordinate detection. If the position of the anti-rotation positioning plane 4a is not controlled, the position of the second avoidance area 301 needs to be confirmed by taking points on the outer bearing limiting baffle 3 every time when three-coordinate detection is performed subsequently, so as to avoid the collision between the second claw arm 303 and the three-coordinate probe, so that the measurement steps are increased, the measurement time is increased, and the measurement efficiency is reduced.

[0069] A detection method of a hub unit, based on the tool for adding the pre-tightening force detection hub unit, the detection method comprises the following steps:

[0070] a. The connecting rod is inserted into the mounting hole of the inner bearing limiting baffle 1, and the inner bearing limiting baffle 1 with the connecting rod is inserted into the inner hole at the inner end of the inner bearing, so that the end face of the first bearing stopper stopper 102 abuts against the inner end face of the inner ring of the inner bearing 202;

[0071] b. The outer bearing limiting baffle 3 is sleeved on the connecting rod, so that the first avoidance area 101 is in one-to-one correspondence with the second avoidance area 301;

[0072] c. The second bearing stopper stopper 302 of the outer bearing limiting baffle 3 is inserted into the inner hole at the outer end of the outer bearing 203, so that the end face 301a of the second bearing stopper stopper abuts against the outer end face of the inner ring of the outer bearing 203.

[0073] d. The limiting fixing member is assembled on the connecting rod, and the limiting fixing member is located at the outer end of the outer bearing limiting baffle 3;

[0074] e. The hub unit is placed on the support seat, which can be a support cylinder, as shown in Figure 12 , the inner end of the hub is downward, the flange plate of the hub unit is parallel to the horizontal plane, then the outer bearing limiting baffle 3 is pressed, the flange plate is rotated three times forward and three times backward, so as to ensure that the inner and outer rings of the two bearings are in full contact, avoid the inclination of the inner ring of the bearing, and ensure that the inner bearing 202 and the outer bearing 203 are adjusted in place;

[0075] f. After the tool for adding the pre-tightening force detection hub unit is assembled on the hub unit according to the above steps, the tool for adding the pre-tightening force detection hub unit applies pre-tightening force to the hub unit, simulates the stress state of the hub unit during actual operation, corrects and adjusts the position and inclination state of the inner and outer bearings, so that the free gap between the two bearings disappears and they contact with each other. At this time, the bearing axis is corrected and will not be inclined.

[0076] The flange plate of the hub unit is clamped by a clamping tool, and the clamping avoids each threaded hole on the flange plate, as shown in Figure 5 The flange plate of the hub unit is perpendicular to the horizontal plane. Preferably, the clamping tool is a vice, and the flange plate is clamped by the vice, and the clamping avoids the mounting hole of the wheel bolt c and the brake drum connecting threaded hole 206 on the flange plate;

[0077] g. The detection equipment detects the to-be-detected part of the hub unit. Since the tool for detecting the pre-tightening force of the hub unit applies a pre-tightening force to the hub unit, the free gap L between the inner bearing 202 and the outer bearing 203 disappears, so that the two end faces of the inner bearing 202 and the outer bearing 203 abut against each other, which simulates the stress state of the hub unit in actual operation, thereby correcting and adjusting the position and inclination of the inner and outer bearings, avoiding the axial inclination of the two bearings, and making the axial lines of the two bearings coincide with the center line of the hub inner cavity, so as to ensure the detection of the hub unit by the client.

[0078] When the connecting rod is a bolt 4 and the limiting fixing member is a nut 5, the above detection method comprises the following steps:

[0079] a. As shown in Figures 8 to 10 , the key is placed in the rod key groove of the bolt 4, and then the rod of the bolt 4 is inserted into the first mounting hole of the inner bearing limiting baffle 1 and the key is installed in cooperation with the claw arm key groove; the key is placed in the rod key groove of the bolt 4, and then the rod of the bolt 4 is inserted into the first mounting hole of the inner bearing limiting baffle 1 and the key is installed in cooperation with the claw arm key groove; the inner bearing limiting baffle 1 with the bolt 4 is inserted into the inner hole at the inner end of the inner bearing 202, and the stop end face of the first bearing stop table stop 102 abuts against the inner end face of the inner ring of the inner bearing 202;

[0080] b. As shown in Figure 11 , the outer bearing limiting baffle 3 is sleeved on the rod of the bolt 4, and the anti-rotation positioning plane 4a near the tail end of the rod of the bolt 4 abuts against the anti-rotation table face of the second mounting hole, and at this time the first avoiding area 101 corresponds to the second avoiding area 301 one by one;

[0081] c. The outer bearing limiting baffle 3 is inserted into the inner hole at the outer end of the outer bearing 203, and the stop end face 301a of the second bearing stop table stop abuts against the outer end face of the inner ring of the outer bearing 203; during the insertion process, the rod of the bolt 4 passes through the second mounting hole of the outer bearing limiting baffle 3;

[0082] d. Then the nut 5 is installed to the stem of the bolt 4 and tightened, the nut 5 is located at the outer end of the outer bearing limiting baffle; after the nut 5 is tightened, the inner bearing limiting baffle 1, the outer bearing limiting baffle 3, the bolt 4 and the hub body 201, the inner bearing 202 and the outer bearing 203 are firmly connected, and the pre-tightening force is applied to the bearing unit, so that the free gap L between the inner bearing 202 and the outer bearing 203 disappears, so that the two end faces of the inner bearing and the outer bearing are in contact with each other, which is equivalent to simulating the stress state of the hub unit during actual operation, correcting and adjusting the position and inclination of the inner and outer bearings, avoiding the inclination of the two bearing axes, and making the axes of the two bearings coincide with the center line of the hub inner cavity, so as to ensure that the client detects the qualified hub unit. The subsequent steps e to f are unchanged and will not be described here.

[0083] In some embodiments, as shown in Figure 4 Two brake drum connecting threaded holes 206 are formed on the flange of the hub, which are spaced 180° apart and used to install the bolts connecting the brake drum.

[0084] In the above step g, the detection equipment is a three-coordinate measuring instrument. After the pre-tightening force detection hub unit tool is installed on the hub unit, the parts of the hub unit that can be detected mainly include: first oil seal 204 jump test, second oil seal 205 jump test, brake drum connecting threaded hole 206 position degree test, half shaft threaded hole f position degree test, flange outer peripheral surface d concentricity test, flange end surface e total runout, wheel bolt c position degree test, brake drum stop a jump test, rim stop b jump test, ABS gear ring end surface h jump and hub outer end surface m jump, etc.

[0085] Hereinafter, taking the jump of the first oil seal 204 and the second oil seal 205 of the three-coordinate measuring hub unit 2 as an example for description:

[0086] When the pre-tightening force detection hub unit tool is assembled to the hub unit, as shown in Figure 4 The line connecting the brake drum connecting threaded hole 206 and the center of the hub body coincides with the centerline of one of the first claw arms 103, and the measurement process of the three-coordinate measuring instrument is simplified in this state. The measurement method is as follows:

[0087] (1) A plurality of points are taken on the flange end surface to determine the flange end surface a by fitting;

[0088] (2) A plurality of points are taken on the hub outer end surface to determine the hub outer end surface β by fitting;

[0089] (3) A plurality of points are taken near the hub outer end of the hub inner cavity to determine the center O1 of the inner cavity at this position;

[0090] (4) Take multiple points in the threaded hole of the flange of the wheel hub to determine the center O2 of the threaded hole;

[0091] (5) The distance between the end surface a and the end surface β determines a vector X, the projection of the line connecting the center O1 and the center O2 on the end surface a of the flange determines a vector Y, and the vector Z perpendicular to XY, thus determining the coordinate system;

[0092] (6) Put the measuring probe through the first avoiding area 101 into the inner hole of the inner bearing to take multiple points, for example, 3 points can be taken in each of the 3 point-taking areas within the 120° range of each first avoiding area 101, and the center O3 of the inner hole of the inner bearing is determined by fitting. Similarly, put the measuring probe through the second avoiding area 301 into the inner hole of the outer bearing to take multiple points, and the center O4 of the inner hole of the outer bearing is determined by fitting. The line connecting the center O3 of the inner hole of the inner bearing and the center O4 of the inner hole of the outer bearing is the reference axis.

[0093] (7) Detect the runout of the first oil seal 204, take multiple points on the end surface of the first oil seal 204 to determine whether the runout of the first oil seal 204 is within the required runout tolerance.

[0094] (8) Detect the runout of the second oil seal 205, take multiple points on the end surface of the second oil seal 205 to determine whether the runout of the second oil seal 205 is within the required runout tolerance.

[0095] Of course, other measurement processes can also be used when using a three-coordinate measuring machine, and the order of measurement is not limited to the above steps.

[0096] For example, after the coordinate system and the reference axis are determined in the above steps (5) and (6), points are taken on the flange end surface e and the ABS ring end surface h as shown in the drawings to fit the planes, so as to evaluate the total runout and the runout. Alternatively, points are taken on the rim stop b and the brake drum stop a in the circumferential direction of the flange plate to fit the whole circle, so as to evaluate the runout and the concentricity. Figure 2

[0097] The measurement of the to-be-inspected parts of the wheel hub unit can also use measurement methods other than three-coordinate measurement, such as scanners, etc.

[0098] ​Even if the inner bearing 202 and the outer bearing 203 of the wheel hub unit are moved during transportation, causing the axes of the two bearings to deviate from the center line of the wheel hub, when the wheel hub unit is transported to the customer for detection, a pre-tightening force detection tool for the wheel hub unit is installed on the wheel hub unit, the tool applies a pre-tightening force to the wheel hub unit to correct the positions of the inner and outer bearings of the wheel hub unit, avoids the axis deviation of the two bearings, and makes the axes of the two bearings coincide with the center line of the inner cavity of the wheel hub, so that the wheel hub unit is still qualified when the to-be-detected part of the wheel hub unit is detected again, and the customer's quality claim is avoided.

[0099] Embodiment two:

[0100] The difference between embodiment two and embodiment one is:

[0101] As shown in Figure 13 , the connecting rod is a prismatic connecting rod 7, and the limiting fixing member is a nut 5. The inner bearing limiting baffle 1 is provided with a first prismatic hole in the middle portion, which is matched with the prismatic connecting rod 7. The outer bearing limiting baffle 3 is provided with a second prismatic hole in the middle portion, which is matched with the prismatic connecting rod 7. The prismatic connecting rod 7 is provided with a threaded portion matched with the nut 5 near the tail end. If the nut 5 is locked, the first avoiding area 101 and the second avoiding area 301 are one-to-one corresponding, and the prismatic connecting rod 7 is matched with the first prismatic hole and the second prismatic hole, which can prevent the inner bearing limiting baffle 1 and the outer bearing limiting baffle 3 from rotating relative to the prismatic connecting rod 7.

[0102] As shown in Figure 14 , of course, the connecting rod is a prismatic connecting rod 7, and the limiting fixing member can also be a circlip 8. The inner bearing limiting baffle 1 is provided with a first prismatic hole in the middle portion, which is matched with the prismatic connecting rod 7. The outer bearing limiting baffle 3 is provided with a second prismatic hole in the middle portion, which is matched with the prismatic connecting rod 7. The circlip 8 is clamped and fixed on the prismatic connecting rod 7 to limit the axial displacement of the outer bearing limiting baffle 3. Similarly, when the circlip 8 is assembled, the first avoiding area 101 and the second avoiding area 301 are one-to-one corresponding, and the prismatic connecting rod 7 is matched with the first prismatic hole and the second prismatic hole, which can prevent the inner bearing limiting baffle 1 and the outer bearing limiting baffle 3 from rotating relative to the prismatic connecting rod 7.

[0103] In the present application, the pre-tightening force detection tool for the wheel hub unit is added to apply a pre-tightening force to the inner bearing and the outer bearing of the wheel hub unit, so that the free gap between the two bearings disappears, thereby making the two end faces of the inner bearing and the outer bearing contact each other, which is equivalent to simulating the stress state of the wheel hub unit during actual operation, so as to correct and adjust the positions and inclination states of the inner and outer bearings, avoid the axis deviation of the two bearings, and make the axes of the two bearings coincide with the center line of the inner cavity of the wheel hub, so as to ensure the detection of the wheel hub unit to be qualified.

[0104] The above merely describes preferred embodiments of the present application, and is not used to limit the present application, any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A tool for adding a pre-tightening force detection hub unit, detachably fixedly connected with the hub unit, the hub unit comprising a hub body, an inner bearing, an outer bearing and an oil seal assembly fixedly installed in the inner cavity of the hub body, characterized in that: the tool for adding the pre-tightening force detection hub unit comprises an inner bearing limiting baffle, an outer bearing limiting baffle and a fixed connection assembly, the inner bearing limiting baffle comprises a first bearing stop and at least two first avoidance zones for avoiding measurement probes, the first bearing stop is inserted into the inner hole at the inner end of the inner bearing, and the end face of the first bearing stop abuts against the inner end face of the inner ring of the inner bearing, the outer bearing limiting baffle comprises a second bearing stop and at least two second avoidance zones for avoiding measurement probes, the second bearing stop is inserted into the inner hole at the outer end of the outer bearing, and the end face of the second bearing stop abuts against the outer end face of the inner ring of the outer bearing, and the fixed connection assembly limits and fixedly connects the inner bearing limiting baffle and the outer bearing limiting baffle. The fixed connection assembly comprises a connecting rod and a limiting and fixing piece, the head of the connecting rod is provided with a limiting head, the connecting rod passes through the inner bearing limiting baffle and the outer bearing limiting baffle and is detachably fixedly connected with the limiting and fixing piece, the limiting head limits the axial displacement of the inner bearing limiting baffle, and the limiting and fixing piece limits the axial displacement of the outer bearing limiting baffle. When the connecting rod and the limiting and fixing piece cooperate to limit and fix the inner bearing limiting baffle and the outer bearing limiting baffle, the first avoidance zones correspond to the second avoidance zones one by one. The inner bearing limiting baffle comprises three first claw arms and a first claw arm connecting portion, the inner ends of the first claw arms are connected with the first claw arm connecting portion, the three first claw arms are arranged in a circumferential array around the center of the first claw arm connecting portion, and the first avoidance zones are formed between adjacent two first claw arms.

2. The tool for adding a pre-tightening force detection hub unit according to claim 1, characterized by: The outer bearing limiting baffle comprises three second claw arms and a second claw arm connecting portion, the inner ends of the second claw arms are connected with the second claw arm connecting portion, the three second claw arms are arranged in a circumferential array around the center of the second claw arm connecting portion, and the second avoidance zones are formed between adjacent two second claw arms.

3. The tool for adding a preload detection hub unit according to claim 2, characterized in that: The outer ends of the three first claw arms are provided with a first claw arm outer circumferential surface, the diameter size of the first claw arm outer circumferential surface is not more than the maximum diameter size of the inner ring of the inner bearing, the outer ends of the three second claw arms are provided with a second claw arm outer circumferential surface, and the diameter size of the second claw arm outer circumferential surface is not more than the maximum diameter size of the inner ring of the outer bearing.

4. The tool for adding a pre-tightening force detection hub unit according to claim 2, characterized by: The connecting rod is a bolt, the limiting and fixing piece is a nut, the rod portion of the bolt is connected with the inner bearing limiting baffle, and the anti-rotation positioning structure is arranged between the rod portion close to the tail end of the bolt and the outer bearing limiting baffle.

5. The tool for adding a preload detection hub unit according to claim 4, characterized in that: The outer bearing limiting baffle is provided with a mounting hole matched with the rod portion of the bolt, and the anti-rotation positioning structure comprises an anti-rotation positioning plane arranged on the rod portion of the bolt and an anti-rotation platform arranged at the mounting hole.

6. The tool for adding a preload detection hub unit according to claim 5, characterized in that: The connecting rod is a prismatic connecting rod, and the limiting and fixing piece is a nut or a clasp spring.

7. The tool for adding a pre-tightening force detection hub unit according to any one of claims 2 to 6, characterized in that: The detection method comprises the following steps:

8. The tool for adding a preload detection hub unit according to any one of claims 7, characterized in that: ​ 9. The tool for adding a pre-tightening force detection hub unit according to any one of claims 2 to 6, characterized in that: ​ 10. A method for detecting a wheel hub unit, based on the tooling for adding a pre-tightening force to a wheel hub unit according to claim 3, characterized in that: ​ a. pass the connecting rod into the mounting hole of the inner bearing limiting baffle, insert the inner bearing limiting baffle with the connecting rod into the inner hole at the inner end of the inner bearing, and make the end face of the first bearing stopper abut against the inner end face of the inner bearing inner ring; b. fit the outer bearing limiting baffle on the connecting rod, and make the first avoiding area correspond to the second avoiding area one by one; c. insert the outer bearing limiting baffle into the inner hole at the outer end of the outer bearing, and make the end face of the second bearing stopper abut against the outer end face of the outer bearing inner ring; d. fit the limiting fixing member on the connecting rod, and the limiting fixing member is located at the outer end of the outer bearing limiting baffle; e. place the hub unit on the support seat, make the hub unit flange plate parallel to the horizontal plane, press the outer bearing limiting baffle, make the hub body rotate forward for three circles and rotate backward for three circles, and ensure that the inner bearing and the outer bearing are adjusted in place; f. after the tool of the hub unit with added pre-tightening force detection is fitted on the hub unit according to the above steps, clamp the flange plate of the hub unit by using the clamping tool, avoid each threaded hole on the flange plate during clamping, make the flange plate of the hub unit vertical to the horizontal plane; g. detect the to-be-detected part of the hub unit by using the detection equipment.

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