Hollow gear shaft gearbox bearing clearance measuring device and measuring method

Abstract

The present invention discloses a hollow gear shaft gearbox bearing clearance measuring device and a measuring method, comprising a center pull rod, a special-shaped pressure block, a bearing assembly and a lever measuring assembly; the center pull rod penetrates the hollow gear shaft from top to bottom and is provided with a boss matched with the upper end of the hollow gear shaft, the special-shaped pressure block passes through the special-shaped hole at the bottom of the box body and is fixedly connected to the center pull rod; the upper end of the center pull rod is fixedly connected to the inner ring of the bearing in the bearing assembly; the lever measuring assembly is fixedly connected to the outer ring of the bearing in the bearing assembly; the center pull rod can rotate along the axial direction of the center pull rod relative to the lever measuring assembly, and the lever measuring assembly can apply a specified force to pull or press the center pull rod, so that the hollow gear shaft reaches the upper and lower limit positions respectively, thereby measuring the bearing clearance.

Description

Technical Field

[0001] The invention relates to the technical field of bearing clearance measuring tooling, and more specifically to a hollow gear shaft gear box bearing clearance measuring device and a measuring method. Background Art

[0002] Bearing clearance is also called bearing clearance. The so-called bearing clearance refers to the amount of movement when the inner ring or outer ring of the bearing is fixed when it is not installed on the shaft or bearing box, and then the unfixed side of the bearing clearance moves radially or axially. According to the direction of movement, it can be divided into radial clearance and axial clearance. The size of the axial clearance of the gear shaft bearing of the gear box is crucial to the normal operation and service life of the gear box. Too large or too small axial clearance of the gear shaft bearing will cause excessive noise in the operation of the gear box, and even accidents such as bearing burning.

[0003] In an existing low-floor gearbox with a complex structure, the first-stage input gear shaft is hollow, and two tapered roller bearings are installed between the two ends and the box body. In order to ensure good transmission conditions, the bearing clearance needs to be accurately controlled. At present, the bearing clearance control of this structure mainly relies on the estimated value after measuring the size of each part for assembly. After the parts are assembled on the box body, there is no effective and accurate measurement method for the bearing clearance due to the particularity of the structure, and it is difficult to measure the bearing clearance of each phase with the existing tapered roller bearings.

[0004] Based on this, a hollow gear shaft gearbox bearing clearance measuring device and a measuring method are proposed to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a hollow gear shaft gearbox bearing clearance measuring device and a measuring method to overcome the above-mentioned defects in the prior art.

[0006] The technical solution to achieve the purpose of the present invention is: a hollow gear shaft gearbox bearing clearance measuring device, the gearbox includes a housing and a hollow gear shaft, the lower end surface of the housing is provided with a special-shaped hole, the upper end of the hollow gear shaft passes through the upper end surface of the housing, the lower end is located inside the housing and a gap is provided between the special-shaped hole at the bottom of the housing; the hollow gear shaft is connected to two tapered roller bearings respectively in the upper and lower directions along the axial direction;

[0007] The bearing clearance measuring device includes a center pull rod, a special-shaped pressure block, a bearing assembly and a lever measuring assembly; the center pull rod passes through the hollow gear shaft from top to bottom and is provided with a boss that matches the upper end of the hollow gear shaft, and the special-shaped pressure block passes through the special-shaped hole at the bottom of the box and is fixedly connected to the center pull rod; the upper end of the center pull rod is fixedly connected to the inner ring of the bearing in the bearing assembly; the lever measuring assembly is fixedly connected to the outer ring of the bearing in the bearing assembly; the center pull rod can rotate along the axial direction of the center pull rod relative to the lever measuring assembly, and the lever measuring assembly can apply a specified force to pull or press the center pull rod, so that the hollow gear shaft reaches the upper and lower limit positions respectively, thereby measuring the bearing clearance.

[0008] Furthermore, the bearing assembly includes a bearing seat and a deep groove ball bearing mounted on the bearing seat, and the bearing seat is fixedly connected to the lever measuring assembly.

[0009] Furthermore, the bearing assembly also includes an auxiliary rotating shaft and a rotating handle; the lower end of the auxiliary rotating shaft is fixedly connected to the central pull rod, and the upper end is fixedly connected to the inner ring of the deep groove ball bearing; the rotating handle is installed on the side of the auxiliary rotating shaft.

[0010] Furthermore, the bearing seat is also provided with a bearing cover for pressing the outer ring of the deep groove ball bearing, a bearing retaining ring for pressing the inner ring of the deep groove ball bearing, and a large nut for pressing the bearing retaining ring.

[0011] Furthermore, the lever measuring assembly includes two detent pins, an auxiliary lever and a supporting screw; the two detent pins are symmetrically fixed on the bearing seat respectively; one end of the auxiliary lever is fixedly connected to the two detent pins, and a first through hole is provided in the middle of the auxiliary lever; the supporting screw is fixedly connected to the end surface of the box body, and the supporting screw is provided with a liftable auxiliary fulcrum pin; the auxiliary fulcrum pin is fixedly connected to the auxiliary lever through the first through hole of the auxiliary lever.

[0012] Furthermore, a standard square hole is provided at one end of the auxiliary lever away from the detent pin, and the standard square hole is used to connect a pointer-type torque wrench.

[0013] Furthermore, a pressure cover is fixed to the upper end of the box body, the hollow gear shaft passes through the pressure cover, and an adjustment washer for adjusting the bearing clearance is provided between the pressure cover and the box body.

[0014] Furthermore, a cushion block is provided on the upper end surface of the hollow gear shaft.

[0015] Furthermore, the lower end of the central pull rod is provided with a thread, the special-shaped pressing block is provided with a corresponding threaded hole and a hexagonal head is provided at the lower end, and the special-shaped pressing block can pass through the special-shaped hole at the bottom of the box body and be threadedly connected to the central pull rod.

[0016] A method for measuring the bearing clearance of a hollow gear shaft gearbox comprises the following steps:

[0017] S1. Pre-install the special-shaped pressing block, insert the special-shaped pressing block into the special-shaped hole of the box from the lower end, and move the special-shaped pressing block to the center of the hollow gear shaft in the gap between the box and the lower end of the hollow gear shaft;

[0018] S2. Insert the center rod from top to bottom into the hollow gear shaft, and the lower end of the hollow gear shaft is threadedly connected to the special-shaped pressing block;

[0019] S3. Fix one end of the support screw to the end surface of the box, and adjust the height of the auxiliary fulcrum pin so that the auxiliary lever position remains horizontal;

[0020] S4. Fix the dial gauge seat to the housing, and make the needle measure the measuring point on the way, that is, the upper end surface of the auxiliary shaft;

[0021] S5. Install the pointer-type torque wrench into the standard square hole of the auxiliary lever. Using the principle of lever, when the pointer-type torque wrench is pressed down at the specified torque, the upper limit position of the auxiliary shaft can be measured by the dial gauge. During the measurement process, the auxiliary shaft can be rotated circumferentially by turning the handle to ensure that the clearance value of each phase can be measured and the measurement error can be eliminated. Similarly, when the pointer-type torque wrench is pressed down at the specified torque, the lower limit position of the auxiliary shaft can be measured by the dial gauge.

[0022] S6. The difference between the upper and lower limit positions is the bearing clearance.

[0023] By adopting the above technical solution, the present invention has the following beneficial effects:

[0024] (1) The present invention solves the problem that the clearance of the tapered roller bearing of the hollow gear shaft of the current structural gearbox is not measurable. By designing the measuring device, the clearance measurement requirements of the assembly production line are met, and measurability, convenience and high precision are achieved to meet the actual production needs.

[0025] (2) The present invention installs a spacer block onto the upper end surface of the hollow gear shaft so that the center pull rod can enter the center of the hollow gear shaft, which facilitates alignment and installation.

[0026] (3) The present invention designs the bearing assembly and lever measuring assembly of the device in a unitized manner, which makes the device easy to install, simple and efficient to operate, and reduces the difficulty of operation for workers. The standardized design of each position component is conducive to the interchangeability of serialized products.

[0027] (4) The structural design of the lever measuring assembly and the bearing assembly of the present invention enables high measurement accuracy, and the repeated measurement accuracy is within 0.01 mm, which well ensures the consistency of product assembly.

[0028] (5) The hexagonal head is designed at the lower end of the special-shaped pressing block of the present invention, which can prevent the special-shaped pressing block from moving with the user and facilitate installation.

[0029] (6) The present invention can control the bearing clearance by replacing the thickness of the adjustment washer.

[0030] (7) The method for measuring the bearing clearance of the hollow gear shaft gearbox of the present invention is easy to operate. The upper and lower limit positions of each phase can be measured by rotating the handle, so that the measurement accuracy of the clearance is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments and in conjunction with the accompanying drawings, wherein

[0032] Figure 1 It is a stereogram of the present invention.

[0033] Figure 2 It is a cross-sectional view of the present invention.

[0034] Figure 3 It is a structural diagram of the bottom of the box body of the present invention.

[0035] Figure 4 It is a cross-sectional view of the center pull rod of the present invention.

[0036] Figure 5 It is a cross-sectional view of the special-shaped pressing block of the present invention.

[0037] The numbers in the accompanying drawings are: 1. Box body; 2. Hollow gear shaft; 3. Tapered roller bearing; 4. Center pull rod; 5. Special-shaped pressure block; 6. Bearing assembly; 61. Bearing seat; 62. Deep groove ball bearing; 63. Auxiliary rotating shaft; 64. Turning handle; 65. Bearing pressure cover; 66. Bearing retaining ring; 67. Large nut; 7. Lever measuring assembly; 71. Push pin; 72. Auxiliary lever; 73. Support screw; 74. Auxiliary fulcrum pin; 8. Spacer; 9. Pressure cover; 10. Adjustment washer. DETAILED DESCRIPTION

[0038] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0042] In the description of the embodiments of the present invention, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is conventionally placed when used, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0043] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The present invention is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the scope of protection of the present invention.

[0044] Example 1, see Figure 1 and Figure 2In an existing low-floor gearbox with a complex structure, the gearbox includes a housing 1 and a hollow gear shaft 2. The lower end surface of the housing 1 is provided with a special-shaped hole. The upper end of the hollow gear shaft 2 passes through the upper end surface of the housing 1, and the lower end is located inside the housing 1 and a gap is provided between the special-shaped hole at the bottom of the housing 1; the hollow gear shaft 2 is connected to two tapered roller bearings 3 in the upper and lower directions along the axial direction. In order to measure the clearance of the gearbox, this embodiment provides a hollow gear shaft gearbox bearing clearance measuring device.

[0045] The device comprises: a central pull rod 4, a special-shaped pressure block 5, a bearing assembly 6 and a lever measuring assembly 7.

[0046] See Figure 3 , Figure 4 and Figure 5 The center pull rod 4 passes through the hollow gear shaft 2 from top to bottom and is provided with a thread at the lower end. The center pull rod 4 is provided with a boss that matches the upper end of the hollow gear shaft 2. The special-shaped pressure block 5 is provided with a corresponding threaded hole. The special-shaped pressure block 5 can pass through the special-shaped hole at the bottom of the box body 1 and be threadedly connected with the center pull rod 4. The hollow gear shaft 2, the center pull rod 4, the special-shaped pressure block 5 and the cushion block 8 are fixedly connected as a whole; and the hollow gear shaft 2 can rotate with the center pull rod 4.

[0047] The upper end of the center pull rod 4 is fixedly connected to the bearing assembly 6, and the bearing assembly 6 can drive the center pull rod 4 to rotate; the lever measuring assembly 7 is fixedly connected to the bearing assembly 6, and the lever measuring assembly 7 can apply a specified force to pull or press the center pull rod 4, so that the hollow gear shaft 2 reaches the upper and lower limit positions respectively, thereby measuring the bearing clearance.

[0048] Preferably, a cushion block 8 is provided on the upper end surface of the hollow gear shaft 2; the center pull rod 4 can be more conveniently inserted into the center of the hollow gear shaft 2 to facilitate alignment.

[0049] Preferably, the bearing assembly 6 comprises a bearing seat 61, a deep groove ball bearing 62 mounted on the bearing seat 61, an auxiliary shaft 63 and a rotating handle 64. The inner ring of the deep groove ball bearing 62 is interference fit with the central tie rod 4. The lower end of the auxiliary shaft 63 is fixedly connected to the central tie rod 4, and the upper end is fixedly connected to the inner ring of the deep groove ball bearing 62. The rotating handle 64 is mounted on the side of the auxiliary shaft 63. The bearing seat 61 is also provided with a bearing gland 65 for pressing the outer ring of the deep groove ball bearing 62, a bearing retaining ring 66 for pressing the inner ring of the deep groove ball bearing 62, and a large nut 67 for pressing the bearing retaining ring 66.

[0050] The auxiliary shaft 63 and the bearing seat 61 are pre-assembled by first installing the deep groove ball bearing 62 into the bearing seat 61, and then installing the two together onto the auxiliary shaft 63. The bearing cover 65 is installed onto the bearing seat 61 by screws to tighten the outer ring of the deep groove ball bearing 62. Finally, the bearing retaining ring 66 is installed onto the auxiliary shaft 63 with a large nut 67 to fix the inner ring of the deep groove ball bearing 62. At this point, the auxiliary shaft 63 and the bearing seat 61 assembly are installed.

[0051] Preferably, a hexagonal head is also provided at the lower end of the special-shaped pressing block 5. The auxiliary shaft 63 is installed to the central pull rod 4, and the rotating handle 64 is first installed to the auxiliary shaft 63, and then the auxiliary shaft 63 assembly is installed to the central pull rod 4. During the tightening process, the hexagonal head part of the special-shaped pressing block 5 at the lower end can be fixed with a wrench.

[0052] Preferably, the lever measuring assembly 7 includes two pins 71, an auxiliary lever 72 and a support screw 73; the two pins 71 are evenly distributed 180° on the outer circle of the bearing seat, and are used to position the auxiliary lever 72 so that the force applied by the auxiliary lever 72 to the auxiliary rotating shaft 63 is located at the center of the shaft; one end of the auxiliary lever 72 is fixedly connected to the two pins 71, and a first through hole is provided in the middle of the auxiliary lever 72; the support screw 73 is fixedly connected to the end face of the box body 1, and the support screw 73 is provided with a liftable auxiliary fulcrum pin 74; the auxiliary fulcrum pin 74 is fixedly connected to the auxiliary lever 72 through the first through hole of the auxiliary lever 72.

[0053] To install the auxiliary lever 63, first install the auxiliary fulcrum pin 74 to the first through hole in the middle of the auxiliary lever 63, then pass the support screw 73 into the auxiliary fulcrum pin 74 and connect it to the threaded hole on the end face of the box body 1, then connect the auxiliary lever 63 to the pins 71 on both sides of the outer circle of the bearing seat 61, and finally adjust the position of the auxiliary fulcrum pin 74 on the support screw 73 to keep the auxiliary lever 72 in a horizontal state.

[0054] Preferably, a standard square hole is further provided at one end of the auxiliary lever 72 away from the detent pin 71, and the standard square hole is used to connect a pointer-type torque wrench.

[0055] Preferably, a gland 9 is fixed to the upper end of the housing 1, the hollow gear shaft 2 passes through the gland 9, and an adjusting washer 10 for adjusting the bearing clearance is provided between the gland 9 and the housing 1. The bearing clearance can be controlled by changing the thickness of the adjusting washer according to the clearance measurement result.

[0056] A method for measuring the bearing clearance of a hollow gear shaft gearbox comprises the following steps:

[0057] S1. The shaped pressing block 5 is pre-installed, the shaped pressing block 5 is inserted into the shaped hole of the housing 1 from the lower end, and the shaped pressing block 5 is moved to the center of the hollow gear shaft 2 in the gap between the housing 1 and the lower end of the hollow gear shaft 2;

[0058] S2. The center rod 4 is inserted from top to bottom into the hollow gear shaft 2, and the lower end of the hollow gear shaft 2 is threadedly connected to the shaped pressing block 5;

[0059] S3. Fix one end of the support screw 73 to the end surface of the housing 1, and adjust the height of the auxiliary fulcrum pin 74 so that the auxiliary lever 72 remains horizontal;

[0060] S4. The dial gauge seat is fixed to the housing 1, and the needle is measured on the way to the measuring point position, that is, the upper end surface of the auxiliary shaft 63;

[0061] S5. Install the pointer-type torque wrench into the standard square hole of the auxiliary lever 72. Using the principle of lever, when the pointer-type torque wrench is pressed down at a specified torque, the upper limit position of the auxiliary shaft 63 can be measured by the dial gauge. During the measurement process, the auxiliary shaft 63 can be rotated circumferentially by rotating the handle 64 to ensure that the clearance value of each phase can be measured and the measurement error can be eliminated. Similarly, when the pointer-type torque wrench is pressed down at a specified torque, the lower limit position of the auxiliary shaft 63 can be measured by the dial gauge.

[0062] S6. The difference between the upper and lower limit positions is the bearing clearance.

[0063] This embodiment solves the problem that the clearance of the tapered roller bearing of the hollow gear shaft of the current structural gearbox is not currently measurable. The measurement device is designed to meet the clearance measurement requirements of the assembly production line, achieve measurability, convenience and high precision, and meet actual production needs. This device unitizes the bearing assembly and lever measurement assembly of the device to achieve convenient installation of the device, simple and efficient operation, and reduce the difficulty of operation for workers. The standardized design of components in each position is conducive to the interchangeability of serialized products. The lever measurement assembly has high measurement accuracy, and the repeated measurement accuracy is within 0.01mm, which well guarantees the consistency of product assembly.

[0064] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hollow gear shaft gearbox bearing clearance measuring device, the hollow gear shaft gearbox comprising a housing (1) and a hollow gear shaft (2), the housing (1) having a lower end surface provided with a special-shaped hole, the upper end of the hollow gear shaft (2) passing through the upper end surface of the housing (1), the lower end being located inside the housing (1) and having a gap between the special-shaped hole and the bottom of the housing (1); the hollow gear shaft (2) being connected to two tapered roller bearings (3) in the axial direction, respectively; Features: The bearing clearance measuring device comprises a center pull rod (4), a special-shaped pressure block (5), a bearing assembly (6) and a lever measuring assembly (7); the center pull rod (4) passes through the hollow gear shaft (2) from top to bottom and is provided with a boss that matches the upper end of the hollow gear shaft (2); the special-shaped pressure block (5) passes through the special-shaped hole at the bottom of the housing (1) and is fixedly connected to the center pull rod (4); the upper end of the center pull rod (4) is fixedly connected to the inner ring of the bearing in the bearing assembly (6); the lever measuring assembly (7) is fixedly connected to the outer ring of the bearing in the bearing assembly (6); the center pull rod (4) can rotate along the axial direction of the center pull rod (4) relative to the lever measuring assembly (7); the lever measuring assembly (7) can apply a specified force to the center pull rod (4) to pull or press so that the hollow gear shaft (2) reaches the upper and lower limit positions respectively, thereby measuring the bearing clearance.

2. The hollow gear shaft gearbox bearing clearance measuring device according to claim 1 is characterized in that: The bearing assembly (6) comprises a bearing seat (61) and a deep groove ball bearing (62) mounted on the bearing seat (61); the bearing seat (61) is fixedly connected to the lever measuring assembly (7).

3. The hollow gear shaft gearbox bearing clearance measuring device according to claim 2 is characterized in that: The bearing assembly (6) further comprises an auxiliary rotating shaft (63) and a rotating handle (64); the lower end of the auxiliary rotating shaft (63) is fixedly connected to the central pull rod (4), and the upper end is fixedly connected to the inner ring of the deep groove ball bearing (62); the rotating handle (64) is mounted on the side of the auxiliary rotating shaft (63).

4. The hollow gear shaft gearbox bearing clearance measuring device according to claim 3 is characterized in that: The bearing seat (61) is also provided with a bearing cover (65) for pressing the outer ring of the deep groove ball bearing (62), a bearing retaining ring (66) for pressing the inner ring of the deep groove ball bearing (62), and a large nut (67) for pressing the bearing retaining ring (66).

5. The hollow gear shaft gearbox bearing clearance measuring device according to claim 3 is characterized in that: The lever measuring assembly (7) comprises two detent pins (71), an auxiliary lever (72) and a supporting screw (73); the two detent pins (71) are symmetrically fixed on the bearing seat (61) respectively; one end of the auxiliary lever (72) is fixedly connected to the two detent pins (71), and a first through hole is provided in the middle of the auxiliary lever (72); the supporting screw (73) is fixedly connected to the end surface of the box body (1), and the supporting screw (73) is provided with a liftable auxiliary fulcrum pin (74); the auxiliary fulcrum pin (74) is fixedly connected to the auxiliary lever (72) through the first through hole of the auxiliary lever (72).

6. The hollow gear shaft gearbox bearing clearance measuring device according to claim 5, characterized in that: One end of the auxiliary lever (72) away from the detent pin (71) is also provided with a standard square hole, and the standard square hole is used to connect a pointer-type torque wrench.

7. The hollow gear shaft gearbox bearing clearance measuring device according to claim 6, characterized in that: A pressure cover (9) is also fixed to the upper end of the housing (1), the hollow gear shaft (2) passes through the pressure cover (9), and an adjustment washer (10) for adjusting the bearing clearance is provided between the pressure cover (9) and the housing (1).

8. The hollow gear shaft gearbox bearing clearance measuring device according to claim 6, characterized in that: A cushion block (8) is provided on the upper end surface of the hollow gear shaft (2).

9. The hollow gear shaft gearbox bearing clearance measuring device according to claim 6, characterized in that: The lower end of the central pull rod (4) is provided with a thread, the special-shaped pressing block (5) is provided with a corresponding threaded hole and a hexagonal head at the lower end, and the special-shaped pressing block (5) can pass through the special-shaped hole at the bottom of the box body (1) and be threadedly connected to the central pull rod (4).

10. A method for measuring the bearing clearance of a hollow gear shaft gearbox according to any one of claims 6 to 9, characterized in that: The following steps are involved: S1. Pre-install the special-shaped pressing block (5), insert the special-shaped pressing block (5) from the lower end into the special-shaped hole of the box (1), and move the special-shaped pressing block (5) to the center of the hollow gear shaft (2) in the gap between the box (1) and the lower end of the hollow gear shaft (2); S2. The center rod (4) is inserted from top to bottom into the hollow gear shaft (2), and the lower end of the hollow gear shaft (2) is threadedly connected to the special-shaped pressing block (5); S3. Fix one end of the support screw (73) to the end surface of the box (1), and adjust the height of the auxiliary fulcrum pin (74) so ​​that the auxiliary lever (72) remains horizontal; S4. The micrometer base is fixed to the housing (1) and the needle is used to measure the measuring point position on the way, that is, the upper end surface of the auxiliary shaft (63); S5. Install the pointer-type torque wrench into the standard square hole of the auxiliary lever (72). Using the principle of the lever, when the pointer-type torque wrench is pressed down at a specified torque, the upper limit position of the auxiliary shaft (63) can be measured by a dial gauge. During the measurement process, the auxiliary shaft (63) can be rotated circumferentially by rotating the handle (64) to ensure that the clearance value of each phase can be measured and the measurement error can be eliminated. Similarly, when the pointer-type torque wrench is pressed down at a specified torque, the lower limit position of the auxiliary shaft (63) can be measured by a dial gauge. S6. The difference between the upper and lower limit positions is the bearing clearance.

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