A device for measuring the play of a small bearing

Abstract

The application provides a small bearing clearance measuring device, which comprises a first accessory group and a second accessory group; the second accessory group comprises a plurality of accessory units corresponding to the bearing model to be measured; the first accessory group comprises a main gear, a sector rack meshed with the main gear, a micrometer and a positioning assembly; the combination of the first accessory group and the second accessory group can select and conveniently replace the corresponding second accessory group according to the model of the bearing to be measured, so that one device can quickly adapt to different standard measuring forces required by bearings of various models; the meshing of the main gear and the sector rack ensures that the pressure applied on the bearing is constant and repeatable; the pressure value can be accurately set by replacing the force spring and the limit of the corresponding limiting bolt and the stop pin, strictly meeting the standard measuring force requirements of different bearing models, and fundamentally ensuring the accuracy and reliability of the measurement results.

Description

Technical Field

[0001] This invention relates to the field of bearing manufacturing, and in particular to a clearance measuring device for small bearings. Background Technology

[0002] Bearing clearance refers to the amount of movement a bearing makes when one of its inner or outer rings is fixed in place, allowing the other ring to move radially or axially, without being installed on a shaft or in a bearing housing. Based on the direction of movement, it can be divided into radial clearance and axial clearance.

[0003] The following methods are commonly used to measure longitudinal clearance:

[0004] (1) When there is no load, fix one ring and apply a certain thrust to the bearing so that the other ring moves radially from one extreme position to the other extreme position relative to the fixed ring. Record this movement as the longitudinal clearance.

[0005] (2) Chinese Patent No. CN104457512A discloses a bearing radial clearance measuring device. The bearing is rotated with clearance and the maximum amount of wobble caused by the clearance on its outer ring is measured. This maximum wobble is the manifestation of the radial clearance. Although this bearing radial clearance measuring device is highly operable and has a simple overall structure, it has extremely high requirements for sensor accuracy and response speed. The measurement results may be slightly affected by factors such as rotation speed, grease viscosity, and cage type. Furthermore, it is difficult to detect bearings with small inner diameters and cannot measure the effective bearing radial clearance.

[0006] The clearance itself is a micrometer (μm) size. The smaller the bearing, the higher the requirements for the accuracy and resolution of the detection equipment. Non-contact or high-precision sensor-type automated detection equipment is commonly used. During the measurement process, the bearing may be deformed or "false zero" due to the measurement force, resulting in invalid measurement results. Summary of the Invention

[0007] To address the aforementioned problems, this invention proposes a clearance measuring device for small bearings.

[0008] The main contents of this invention include:

[0009] A clearance measuring device for a small bearing includes a first assembly and a second assembly.

[0010] The first accessory assembly includes a measuring housing, a main gear disposed within the measuring housing, a sector rack meshing with the main gear, and a dial indicator and positioning assembly disposed on the outer surface of the mounting side plate of the measuring housing; a first connecting rod is connected to the non-tooth end of the sector rack, and a pressure rod is hinged to the other end of the first connecting rod, the pressure rod extending toward the mounting side plate of the measuring housing; a return spring is connected between the first connecting rod and the measuring housing;

[0011] The second accessory group includes several accessory units corresponding to the bearing model to be tested. Each accessory unit is suitable for measuring the clearance of a bearing. Each accessory unit includes a standard bearing, a force spring, a mounting base, and a mandrel.

[0012] The placement base is detachably mounted on the outer surface of the measuring housing and located vertically above the dial indicator; the mandrel is used to be inserted into the inner ring of the bearing to be measured; the positioning component is used to press against the mandrel during measurement;

[0013] One end of the corresponding force-applying spring is connected to the end of the pressure rod near the first connecting rod, and the other end is connected to the lower inner surface of the mounting side plate of the measuring housing;

[0014] By rotating the main gear, the pressure rod is moved between a first position and a second position;

[0015] In the first position, the pressure head of the pressure rod is located behind the placement base, and the force-applying spring has a first length; in the second position, the pressure head of the pressure rod is located directly above the placement base; the force-applying spring has a second length; the first length is greater than the second length, and the first length is less than the original length of the force-applying spring.

[0016] Preferably, the first accessory group further includes a first rotating shaft and a second rotating shaft, both ends of which are rotatably connected to the support side plate of the measuring housing; the main gear is mounted on the first rotating shaft and rotates synchronously with the rotation of the first rotating shaft; the sector rack is sleeved on the second rotating shaft, and the second rotating shaft rotates synchronously with the rotation of the sector rack.

[0017] Preferably, the non-toothed surface of the fan-shaped rack extends outward with a first stop pin, and a limit bolt is correspondingly provided inside the measuring housing. When the pressure rod is in the second position, the first stop pin abuts against the limit bolt.

[0018] Preferably, the first accessory group further includes a third rotating shaft, a handle fixedly connected to one end of the third rotating shaft, and a second connecting rod in an approximately L-shape fixedly connected to the other end of the third rotating shaft, the free end of the second connecting rod abutting against the lower part of the pressure rod via a roller;

[0019] One end of the third rotating shaft is rotatably connected to the support side plate of the measuring housing, and the other end extends into the measuring housing; the handle is located outside the measuring housing, and a torsion spring is disposed on the third rotating shaft and between the handle and the measuring housing; a second stop pin is provided on the outer surface of the support side plate of the measuring housing; when the handle is rotated, the second connecting rod lifts the pressure rod to a specific height through the roller; the rotation angle of the handle is limited by the torsion spring and the second stop pin.

[0020] Preferably, the outer surface of the mounting side plate of the measuring housing is provided with a mounting frame, the mounting frame including a first mounting frame disposed on the outer surface of the mounting side plate and a second mounting frame disposed above the first mounting frame; the placement base is detachably disposed on the first mounting frame, the dial indicator is detachably connected to the first mounting frame; and the positioning component is mounted on the second mounting frame.

[0021] Preferably, the first mounting bracket includes a first mounting body and a first locking part formed on one side of the first mounting body; the first mounting body is detachably mounted on the outer surface of the mounting side plate, and a first groove extending laterally is provided on the back of the first mounting body; a second groove is correspondingly provided on the outer surface of the mounting side plate; when the first mounting body is mounted on the mounting side plate, the first groove and the second groove form a limiting positioning groove, and a limiting positioning rod is disposed in the limiting positioning groove;

[0022] The first locking part includes locking units extending from both sides of the front of the first mounting body, and two locking units constitute a clamp-shaped first locking part.

[0023] Preferably, the first mounting bracket further includes a guide assembly, which includes a guide sleeve fitted on the dial indicator and a guide pin; the guide sleeve is provided with a guide pin; the first mounting body has a guide pin hole, and the guide pin is disposed in the guide pin hole.

[0024] Preferably, the second mounting bracket includes a support frame and a mounting plate. One end of the support frame is detachably connected to the first mounting body, the mounting plate is fixedly disposed on the upper part of the support frame, and the positioning component is disposed on the mounting plate.

[0025] Preferably, the positioning component includes a positioning rod slidably connected to the mounting plate and a driving unit for driving the positioning rod to slide.

[0026] The support frame has a third groove on the outer surface facing the mounting side plate. The third groove, the first groove, and the second groove form a limiting and positioning groove.

[0027] Preferably, the placement base includes a base body and a placement body protruding from the upper surface of the base body; the upper surface of the placement body is provided with a V-shaped placement groove extending in a first direction and a clearance groove extending in a second direction; the bearing to be tested is placed in the clearance groove, and the mandrel passes through the inner ring of the bearing to be tested and is placed in the V-shaped placement groove; the probe of the dial indicator is arranged directly below the clearance groove.

[0028] The upper surface of the first mounting bracket is provided with an auxiliary protrusion extending in a first direction; the lower surface of the base body is provided with an auxiliary groove, and the auxiliary protrusion is disposed in the auxiliary groove.

[0029] The V-shaped placement groove divides the clearance groove into a first opening and a second opening. The width of the first opening is smaller than the width of the second opening, and the first opening is clearance-fitted with the bearing to be tested.

[0030] This invention proposes a clearance measuring device for small bearings, which has the following beneficial effects:

[0031] (1) By adopting the combination of the first accessory group and the second accessory group, the corresponding second accessory group can be selected and conveniently replaced according to the model of the bearing to be measured, so that one device can quickly adapt to the different standard measuring forces required by various models of bearings, realize the universality of the device, and reduce the equipment cost in multi-variety, small-batch testing scenarios;

[0032] (2) Through the meshing of the main gear and the sector rack, the connecting rod can be precisely stopped at the same angular position each time it rotates, ensuring that the compression length of the force spring connected to the pressure rod is consistent, thereby ensuring that the pressure applied to the bearing is constant and repeatable; this pressure value can be precisely set by replacing the force spring and the corresponding limit bolt and stop pin limit, strictly meeting the standard measurement force requirements required by different bearing models, fundamentally ensuring the accuracy and reliability of the measurement results;

[0033] (3) The power input of this device is only the rotational motion of a single shaft, which can be easily connected to drive sources such as motors and cylinders to realize automated control of the measurement process. It is very suitable for integration into automated production lines for online high-speed detection, which greatly improves production efficiency. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2The structural schematic diagram of the measuring casing is omitted.

[0036] Figure 3 A schematic diagram of the structure of each mechanism inside the outer casing;

[0037] Figure 4 This is a schematic diagram showing the installation of the dial indicator and positioning components;

[0038] Figure 5 This is a schematic diagram of the structure for placing the base;

[0039] Figure label:

[0040] 1-1-Installation side panel; 1-2-Supporting side panel; 1-3-Rear side panel; 1-4-Top cover plate;

[0041] 10-First rotating shaft; 100-Mandrel; 11-Main gear; 12-Sector rack; 13-Second rotating shaft; 14-First connecting rod; 15-Pressure rod; 16-Return spring; 17-Force-applying spring; 18-Spring mounting post; 19-Dial indicator;

[0042] 20-Third pivot; 21-Second connecting rod; 22-Handle; 23-Second stop pin; 24-Torsion spring; 25-Roller;

[0043] 3-Mounting frame; 30-First mounting frame; 300-First mounting body; 301-First locking part; 3020-First groove; 303-Limit positioning rod; 304-Guide sleeve; 305-Guide pin; 31-Second mounting frame; 310-Support frame; 311-Mounting plate;

[0044] 40-Positioning assembly; 400-Positioning lever; 401-Rotating wrench; 402-Connecting rod; 403-Connecting block;

[0045] 50 - Placement base; 500 - Base body; 501 - Auxiliary groove; 502 - Auxiliary protrusion; 510 - Placement body; 511 - V-shaped placement groove; 512 - Clearance groove; 512-1 - First opening; 512-2 - Second opening. Detailed Implementation

[0046] The technical solution protected by this invention will be described in detail below with reference to the accompanying drawings.

[0047] This invention proposes a clearance measuring device for small bearings. It can select a pre-configured second accessory group according to the model of the bearing to be tested, and assemble the components in the second accessory group with the first accessory group. This provides a reliable standard pressure for measuring the longitudinal clearance of the corresponding bearing. Then, the corresponding longitudinal clearance value can be obtained with the help of a dial indicator. In other words, it can be applied to the clearance measurement of bearings of various specifications with simple transformation.

[0048] The present invention provides a small bearing clearance measuring device comprising a first accessory group and a second accessory group; wherein, the first accessory group is a component not directly related to the specifications of the bearing under test, while the second accessory group is a component directly related to the bearing under test, including a component for adapting the positioning of the bearing under test and a component for generating the standard pressure required for measuring the longitudinal clearance of the bearing under test.

[0049] Please refer to Figures 1 to 5 The first accessory group includes a measuring housing, which includes a user-facing mounting side plate 1-1, two opposing support side plates 1-2, a rear side plate 1-3 corresponding to the mounting side plate 1-1, and an upper cover plate 1-4 covering the top. Each part of the measuring housing can be made of heavy materials to ensure the overall stability of the device and the reliability of its cooperation with other components. An opening is provided on the upper cover plate 1-4 to facilitate the replacement of components in the second accessory group.

[0050] The second accessory also includes a dial indicator 19 and a positioning component 40, both of which are fixedly mounted on the outer surface of the mounting side plate 1-1 via the mounting bracket 3; specifically, please refer to... Figure 1 , Figure 2 and Figure 4 The mounting frame 3 can be detachably mounted on the outer surface of the mounting side plate 1-1 via screws. More specifically, the mounting frame 3 includes a first mounting bracket 30 mounted on the outer surface of the mounting side plate 1-1 and a second mounting bracket 31 mounted above the first mounting bracket 30. The bearing to be tested is mounted on the first mounting bracket 30, and the dial indicator 19 is also fixedly mounted via the first mounting bracket 30. The positioning component 40 is assembled above the dial indicator and the bearing to be tested via the second mounting bracket 31. At the same time, the mechanism for applying pressure to the bearing to be tested is also located above the bearing to be tested. This arrangement ensures that the probe of the dial indicator and the bearing to be tested are on the same axis, which to a certain extent guarantees the accuracy of the measurement.

[0051] Please refer to Figure 2 and Figure 4The first mounting bracket 30 includes a first mounting body 300 and a first locking part 301 formed on one side of the first mounting body 300; the first mounting body 300 is detachably mounted on the outer surface of the mounting side plate 1-1 by screws. Since the bearing to be tested needs to be placed on the first mounting bracket 30, in order to ensure measurement accuracy, a first groove 3020 extending laterally is provided on the back of the first mounting body 300; a second groove (not shown) is correspondingly provided on the outer surface of the mounting side plate 1-1; wherein, the "lateral" "It is a direction perpendicular to the downward direction of the bearing under test. When the first mounting body 300 is installed on the mounting side plate 1-1, the first groove 3020 and the second groove form a limiting positioning groove. The limiting positioning groove is equipped with a limiting positioning rod 303. That is, before the first mounting body 300 is locked with screws, the limiting positioning rod 303 and the limiting positioning groove are used to ensure the "levelness" of the first mounting bracket 30. The levelness here is a plane that is perpendicular to the downward direction of the bearing under test and the extension direction of the dial indicator probe.

[0052] Furthermore, please combine Figure 5 A placement base 50 is installed on the first mounting bracket 30. The bearing to be tested is stably placed through the placement base 50 and the positioning component 40. In order to ensure that the radial direction of the bearing to be tested is consistent with the axial direction of the dial indicator 19 probe, so as to improve the accuracy of clearance measurement to a certain extent, on the basis that the first mounting bracket 30 is accurately installed, it is also necessary to ensure that the placement base 50 and the first mounting bracket 30 are precisely matched. Specifically, the placement base 50 includes a base body 500 and a placement body 510 protruding from the upper surface of the base body; to achieve stable placement of the bearing to be tested, the upper surface of the placement body 510 is provided with a V-shaped placement groove 511 extending in a first direction and a clearance groove 512 extending in a second direction, the first direction and the second direction being perpendicular to each other; during measurement, the mandrel 100 is first passed through the inner ring of the bearing to be tested, and then the bearing to be tested is placed in the V-shaped placement groove 511; at this time, the probe of the dial indicator 19 is positioned directly below the clearance groove 512 and in contact with the outer circumference of the bearing to be tested; and to further ensure For stability during measurement, the placement base 50 is a component within the second accessory group. The bearing to be tested is placed in the clearance groove 512. It is necessary to prevent the outer ring from shifting when the inner and outer rings are displaced under pressure. Specifically, the V-shaped placement groove 511 of the placement base 50 corresponds to the height of the corresponding bearing. To facilitate placing the bearing to be tested into the clearance groove 512, the V-shaped placement groove 511 divides the clearance groove 512 into a first opening 512-1 and a second opening 512-2. The width of the first opening 512-1 is smaller than the width of the second opening 512-2, and the first opening 512-1 has a clearance fit with the bearing to be tested.

[0053] Meanwhile, the mandrel 100 must ensure that the inner ring does not shift. The mandrel 100 is also a component in the second accessory group, and the corresponding mandrel must be selected according to the model of the bearing to be tested. After the bearing to be tested is placed on the placement base 50, the positioning component 40 presses it onto the mandrel 100, so that the mandrel 100 is stably pressed into the V-shaped placement groove, thereby fixing the inner ring of the bearing to be tested.

[0054] Since the placement base 50 and the spindle 100 need to be replaced according to the model of the bearing to be tested, the placement base 50 must meet the requirements of quick disassembly and ensure assembly accuracy. In this embodiment, the upper surface of the first mounting bracket 30 is provided with an auxiliary protrusion 502 extending in the first direction; the lower surface of the base body 500 is provided with an auxiliary groove 501, and the auxiliary protrusion 502 is disposed in the auxiliary groove 501. That is, through such cooperation, the cooperation accuracy between the placement base 50 and the first mounting bracket 30 is ensured, and then the two can be locked by means such as screws.

[0055] Similarly, in order to ensure the consistency of the displacement direction between the dial indicator probe and the bearing under test, the dial indicator 19 also needs to be stably assembled. In this embodiment, the dial indicator 19 is locked by the first locking part 301. The first locking part 301 includes locking units extending from both sides of the front of the first mounting body 300. The two locking units form a clamp-shaped first locking part. That is, after the dial indicator is placed into the area enclosed by the two locking units, the two are locked together with screws.

[0056] To further ensure the assembly accuracy of the dial indicator, the first mounting bracket 30 also includes a guide assembly, which includes a guide sleeve 304 and a guide pin 305 fitted on the dial indicator 19; the guide sleeve 304 is provided with the guide pin 305; the first mounting body 300 is provided with a guide pin hole, and the guide pin 305 is disposed in the guide pin hole.

[0057] Similarly, the positioning assembly 40 that clamps the mandrel 100 also needs to ensure a certain installation accuracy. Please refer to [reference needed]. Figure 1 and Figure 2 The second mounting bracket 31 includes a support frame 310 and a mounting plate 311. One end of the support frame 310 is detachably connected to the first mounting body 300. The mounting plate 311 is fixedly disposed on the upper part of the support frame 310. The positioning component 40 is disposed on the mounting plate 311.

[0058] In this embodiment, the positioning component 40 includes a positioning pressure rod 400 slidably connected to the mounting plate 311 and a driving unit for driving the positioning pressure rod 400 to slide. Specifically, the driving unit may include a rotary wrench 401 and a connecting rod 402 connected to the rotary wrench. A connecting block 403 is connected below the connecting rod, and the positioning pressure rod 400 is mounted on the connecting block 403. A slide rail is also provided on the mounting plate 311, and the connecting block 403 can slide along the slide rail. More specifically, the rotary wrench 401 rotates around a pin, and the connecting rod 402 is V-shaped. The rotary wrench 401 is connected to one end of the connecting rod, and the other end of the connecting rod is connected to the connecting block 403. The rotary wrench 401 drives the connecting block 403 to move up and down through the connecting rod 402, enabling the positioning pressure rod 400 to move up and down. In other embodiments, the driving unit may also use a motor, cylinder, or other driving source, and the movement is controlled by an external controller to achieve automated operation.

[0059] Similarly, to ensure the precise alignment of the positioning rod 400 and the spindle 100, a third groove is provided on the outer surface of the support frame 310 facing the mounting side plate 1-1. The third groove, the first groove, and the second groove form a limiting positioning groove, which also ensures the precise assembly of the support frame 310 and the mounting side plate 1-1.

[0060] After the bearing to be tested is stably placed and pressed down, the corresponding force-applying mechanism can be controlled to apply a specific pressure to the bearing. The force-applying mechanism of this invention is also assembled from the first component group and the second component group. For details, please refer to [link / reference]. Figure 2 and Figure 3 A first rotating shaft 10 and a second rotating shaft 13 are rotatably mounted between the two supporting side plates 1-2 of the measuring housing. A main gear 11 is provided on the first rotating shaft 10, and a sector rack 12 is provided on the second rotating shaft 13. The sector rack 12 meshes with the main gear 11. A first connecting rod 14 is integrally formed at one end of the sector rack 12. The first connecting rod 14 extends upward, and a pressure rod 15 is hinged to its upper end. The other end of the pressure rod 15 extends toward the placement base 50. Simultaneously, the pressure rod 15 and the first... A force-applying spring 17 is connected near one hinged end of the connecting rod 14. The other end of the force-applying spring 17 is connected to the lower inner wall of the rear side plate 1-3 through a spring mounting post 18. That is, the force-applying spring 17 applies pressure to the pressure rod, so that the pressure rod 15 can exert pressure on the bearing to be tested located on the placement base 50. By rotating the first rotating shaft 10, the main gear 11 rotates, which drives the sector rack 12 to rotate. The first connecting rod 14 also rotates synchronously, pushing the pressure rod 15 toward or away from the placement base 50.

[0061] This invention enables the pressure rod 15 to move along a first plane between a first position and a second position by rotating the main gear 11. The first plane is parallel to the plane containing the central axis of the bearing under test. In the first position, the pressure head of the pressure rod 15 is located behind the placement base, and the force spring 17 has a first length, which is less than the original length of the force spring. That is, in the first position, the force spring 17 is pre-compressed, but since the pressure head is not located above the bearing under test, the pressure rod 15 will not apply force to the bearing under test placed on the placement base. In the second position, the pressure head of the pressure rod 15 is located directly above the placement base, and the force spring 17 has a second length, which is less than the first length. That is, the force spring is further compressed, and with the cooperation of the force spring 17, the pressure rod 15 can apply corresponding pressure to the bearing under test.

[0062] This invention can precisely control the movement displacement of the pressure rod 15 by controlling the rotation angle of the main gear 11. Since the length and rotation angle of the first connecting rod 14 are also fixed, and the position of the force spring 17 and the pressure rod 15 are also fixed, and the position of the connection point between its other end and the inner surface of the mounting side plate 1-1 is also fixed, the lengths in the first and second positions are also fixed, and the angle between the force spring 17 and the horizontal direction is also fixed. That is, the upward pushing force generated by the force spring 17 on the pressure rod is also fixed, thereby generating a downward pressure at the pressure head of the pressure rod. Due to the lever principle, the pressure generated at the pressure head of the pressure rod is also fixed, and even if the spring force of the force spring 17 is small, it can still generate a large pressure at the pressure head of the pressure rod.

[0063] Furthermore, a return spring 16 is connected between the first connecting rod 14 and the measuring housing; as... Figure 2 As shown, one end of the return spring 16 is connected to the first connecting rod 14, and the other end is connected to the lower part of the rear side plate 1-1 of the measuring housing via a corresponding spring mounting post 18. When the measurement is completed and the drive main gear reverses to return the pressure rod to the first position, the return spring 16 helps pull the first connecting rod 14 back to the initial position. The return spring 16 overcomes the weight of the first connecting rod 14 and the pressure rod 15, as well as the friction at the hinge point, helping the force application mechanism to reliably reset and ensuring that the measurement cycle can be completed automatically and smoothly.

[0064] Furthermore, to ensure the accuracy of the first and second positions, a first stop pin (not shown) extends outward from the non-tooth surface of the sector rack 12, and a corresponding limit bolt (not shown) is provided inside the measuring housing. When the pressure rod 15 is in the second position, the first stop pin abuts against the limit bolt. That is, the accuracy of the second position is ensured by such a limiting setting. Of course, the corresponding limit bolt can also be set in the corresponding position according to the bearing model.

[0065] Please see Figure 3 The first accessory assembly also includes a third rotating shaft 20, a handle 22 fixedly connected to one end of the third rotating shaft 20, and a second connecting rod 21 in an approximately L-shape fixedly connected to the other end of the third rotating shaft 20. The free end of the second connecting rod 21 abuts against the pressure rod 15 via a roller 25. Simultaneously, one end of the third rotating shaft 20 is rotatably connected to the support side plate 1-2 of the measuring housing, and the other end extends into the measuring housing. The handle 22 is located outside the measuring housing. A torsion spring 24 is disposed on the third rotating shaft 20 between the handle and the measuring housing. A second stop pin 23 is provided on the outer surface of the support side plate of the measuring housing. When the handle 22 is rotated, the second connecting rod 21 lifts the pressure rod 15 to a specific height via the roller 25. The rotation angle of the handle is limited by the torsion spring 24 and the second stop pin 23. By repeatedly lifting the pressure rod, multiple readings can be taken, and the longitudinal clearance value can be calculated more accurately based on these multiple readings.

[0066] This invention can measure the longitudinal clearance of various bearings by simply replacing the components in the corresponding second accessory group. The corresponding accessory unit is selected according to the bearing model to be tested. In order to further improve the accuracy, the force spring can be inspected before using the new accessory unit to ensure its effectiveness. The entire device is then calibrated using the standard bearing in the accessory unit before measurement.

[0067] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A clearance measuring device for a small bearing, characterized in that, Includes the first accessory group and the second accessory group; The first accessory assembly includes a measuring housing, a main gear disposed within the measuring housing, a sector rack meshing with the main gear, and a dial indicator and positioning assembly disposed on the outer surface of the mounting side plate of the measuring housing; a first connecting rod is connected to the non-tooth end of the sector rack, and a pressure rod is hinged to the other end of the first connecting rod, the pressure rod extending toward the mounting side plate of the measuring housing; a return spring is connected between the first connecting rod and the measuring housing; The second accessory group includes several accessory units corresponding to the bearing model to be tested. Each accessory unit is suitable for measuring the clearance of a bearing. Each accessory unit includes a standard bearing, a force spring, a mounting base, and a mandrel. The placement base is detachably mounted on the outer surface of the measuring housing and located vertically above the dial indicator; the mandrel is used to be inserted into the inner ring of the bearing to be measured; the positioning component is used to press against the mandrel during measurement; One end of the corresponding force-applying spring is connected to the end of the pressure rod near the first connecting rod, and the other end is connected to the lower inner surface of the mounting side plate of the measuring housing; By rotating the main gear, the pressure rod is moved between a first position and a second position; In the first position, the pressure head of the pressure rod is located behind the placement base, and the force-applying spring has a first length; in the second position, the pressure head of the pressure rod is located directly above the placement base; the force-applying spring has a second length; the first length is greater than the second length, and the first length is less than the original length of the force-applying spring.

2. The clearance measuring device for a small bearing according to claim 1, characterized in that, The first accessory group also includes a first rotating shaft and a second rotating shaft, both ends of which are rotatably connected to the support side plate of the measuring housing; the main gear is mounted on the first rotating shaft and rotates synchronously with the rotation of the first rotating shaft; the sector rack is sleeved on the second rotating shaft, and the second rotating shaft rotates synchronously with the rotation of the sector rack.

3. The clearance measuring device for a small bearing according to claim 2, characterized in that, The non-toothed surface of the fan-shaped rack extends outward with a first stop pin, and a limit bolt is correspondingly provided inside the measuring housing. When the pressure rod is in the second position, the first stop pin abuts against the limit bolt.

4. The clearance measuring device for a small bearing according to claim 1, characterized in that, The first accessory group also includes a third rotating shaft, a handle fixedly connected to one end of the third rotating shaft, and a second connecting rod in an approximately L-shape fixedly connected to the other end of the third rotating shaft. The free end of the second connecting rod abuts against the lower part of the pressure rod via a roller. One end of the third rotating shaft is rotatably connected to the support side plate of the measuring housing, and the other end extends into the measuring housing; The handle is located outside the measuring housing. A torsion spring is disposed on the third rotating shaft between the handle and the measuring housing. A second stop pin is provided on the outer surface of the support side plate of the measuring housing. When the handle is rotated, the second connecting rod lifts the pressure rod to a specific height through the roller. The rotation angle of the handle is limited by the torsion spring and the second stop pin.

5. The clearance measuring device for a small bearing according to claim 1, characterized in that, The outer surface of the mounting side plate of the measuring housing is provided with a mounting frame, the mounting frame including a first mounting frame disposed on the outer surface of the mounting side plate and a second mounting frame disposed above the first mounting frame; the placement base is detachably disposed on the first mounting frame, the dial indicator is detachably connected to the first mounting frame; the positioning component is mounted on the second mounting frame.

6. The clearance measuring device for a small bearing according to claim 5, characterized in that, The first mounting bracket includes a first mounting body and a first locking part formed on one side of the first mounting body; the first mounting body is detachably mounted on the outer surface of the mounting side plate, and a first groove extending laterally is provided on the back of the first mounting body; a second groove is correspondingly provided on the outer surface of the mounting side plate; when the first mounting body is mounted on the mounting side plate, the first groove and the second groove form a limiting positioning groove, and a limiting positioning rod is disposed in the limiting positioning groove; The first locking part includes locking units extending from both sides of the front of the first mounting body, and two locking units constitute a clamp-shaped first locking part.

7. The clearance measuring device for a small bearing according to claim 6, characterized in that, The first mounting bracket further includes a guide assembly, which includes a guide sleeve fitted on the dial indicator and a guide pin; the guide sleeve is provided with a guide pin; the first mounting body has a guide pin hole, and the guide pin is disposed in the guide pin hole.

8. The clearance measuring device for a small bearing according to claim 6, characterized in that, The second mounting bracket includes a support frame and a mounting plate. One end of the support frame is detachably connected to the first mounting body. The mounting plate is fixedly disposed on the upper part of the support frame. The positioning component is disposed on the mounting plate.

9. The clearance measuring device for a small bearing according to claim 8, characterized in that, The positioning component includes a positioning rod slidably connected to the mounting plate and a driving unit for driving the positioning rod to slide. The support frame has a third groove on the outer surface facing the mounting side plate. The third groove, the first groove, and the second groove form a limiting and positioning groove.

10. A clearance measuring device for a small bearing according to claim 5, characterized in that, The placement base includes a base body and a placement body protruding from the upper surface of the base body; the upper surface of the placement body is provided with a V-shaped placement groove extending in a first direction and a clearance groove extending in a second direction; the bearing to be tested is placed in the clearance groove, and the mandrel passes through the inner ring of the bearing to be tested and is placed in the V-shaped placement groove; the probe of the dial indicator is arranged directly below the clearance groove. The upper surface of the first mounting bracket is provided with an auxiliary protrusion extending in a first direction; the lower surface of the base body is provided with an auxiliary groove, and the auxiliary protrusion is disposed in the auxiliary groove. The V-shaped placement groove divides the clearance groove into a first opening and a second opening. The width of the first opening is smaller than the width of the second opening, and the first opening is clearance-fitted with the bearing to be tested.

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