Gearbox large clearance measuring device

Abstract

The utility model discloses a gear box large clearance measuring device, which comprises a measuring part and a connecting part fixedly connected with a gear shaft, a pull rod part capable of moving along the axial direction of the gear shaft is rotatably arranged on the connecting part, the rotating axis of the pull rod part is the same as the rotating axis of the gear shaft, the measuring part is arranged on a gear box, and the measuring part is arranged on the gear box. The measuring end is in contact with the end face or the measuring face of the gear shaft, and the measuring face is parallel to the end face of the gear shaft and is fixedly connected with the gear shaft in the axial direction. According to the utility model, the pull rod part which can only do lifting motion in the traditional measuring tool is optimized to be capable of moving along the axial direction of the gear shaft and rotating relative to the gear shaft, so that when the axial clearance of the bearing of the gearbox is measured, the gear shaft can be rotated, the actual use condition of the gear shaft can be simulated, and the measurement accuracy is improved. Compared with the traditional method of measuring the clearance by directly drawing the gear shaft, the method has the advantages that the measuring precision is improved while the axial clearance of the gear box bearing is measured simply and efficiently.

Description

Technical Field

[0001] The utility model relates to the technical field of gear box testing tooling, in particular to a large clearance measuring device for a gear box. Background Art

[0002] The axial clearance of the gear shaft bearing is crucial to the normal operation and service life of the gearbox. If the axial clearance of the gear shaft bearing is too large or too small, the gearbox will cause excessive operating noise. At the same time, if the clearance is inappropriate, the heat generated by friction will cause the temperature of the shaft and bearing to rise, thereby causing abnormal thermal expansion, resulting in limited axial displacement, and then generating excessive stress, affecting the normal operation of the bearing and even the entire system.

[0003] Traditionally, the axial clearance measurement tool for gearbox pinion bearings utilizes a crane and a hook scale. During operation, the hook scale is mounted on the crane, a lifting ring is installed at the end of the pinion, and the hook scale and the lifting ring are connected with an iron chain. A dial indicator is placed at the end of the pinion, the dial indicator is reset to zero, and the hook scale is set to zero. The crane is then pulled until the hook scale reaches the specified tension value. The reading on the dial indicator is the axial clearance of the pinion bearing. Similar patent documents, such as the Chinese utility model with authorization publication number CN 202938765 U, all measure the circumferential clearance of the bearing by directly pulling the pinion axially. This convenient operation has been adopted to this day and has become a common measurement method in the industry.

[0004] Although the above measurement method can measure the gearbox bearing clearance simply and efficiently, the shaft cannot be rotated when measuring using such a measuring tool, and the bearing clearance is not measured accurately, and there is a certain measurement error. Utility Model Content

[0005] The purpose of the utility model is to address the deficiencies of the prior art and to propose a large clearance measuring device for a gearbox, which can achieve simple and efficient measurement of the axial clearance of a gearbox bearing while improving the measurement accuracy.

[0006] The technical solution to achieve the purpose of this utility model is:

[0007] A large clearance measuring device for a gearbox includes a measuring part and a connecting part fixedly connected to a gear shaft, a pull rod part movable along the axial direction of the gear shaft being rotatably mounted on the connecting part, the rotation axis of the pull rod part being the same as the rotation axis of the gear shaft, the measuring part being mounted on the gearbox, and the measuring end being in contact with the end face or measuring surface of the gear shaft, the measuring surface being arranged parallel to the end face of the gear shaft and fixedly connected to the gear shaft along the axial direction.

[0008] Furthermore, the connecting portion is a bearing seat fixedly mounted on the end face of the gear shaft, a bearing is coaxially connected between the pull rod portion and the bearing seat, and the outer ring and inner ring of the bearing are fixedly connected to the bearing seat and the pull rod portion respectively.

[0009] Furthermore, the bearing is a ball bearing.

[0010] Furthermore, the outer ring and the inner ring of the bearing are interference fit with the inner ring of the bearing seat and the outer ring of the pull rod portion respectively.

[0011] Furthermore, the two ends of the bearing are respectively provided with a first bearing pressure plate and a second bearing pressure plate fixed to the bearing seat and the pull rod part by screws, the inner ring of the first bearing pressure plate extends to the outer ring of the bearing, and the outer ring of the second bearing pressure plate extends to the inner ring of the bearing, and the bearing is axially limited and installed between the bearing seat and the pull rod part by the first bearing pressure plate and the second bearing pressure plate.

[0012] Furthermore, the outer ring of the bearing seat is provided with an annular boss extending outward. When the gear shaft is a solid shaft, the annular boss is fixedly connected to the end face of the solid gear shaft and the bottom face is fitted with the end face of the solid gear shaft; when the gear shaft is a hollow shaft, the outer wall of the bearing seat is fitted with the inner wall of the hollow gear shaft, the annular boss is located at the top of the bearing seat and the lower end face is fixedly connected to the annular end face of the hollow gear shaft by screws.

[0013] Furthermore, the measuring part is a dial indicator, and the dial indicator is installed on the gear box through an adjustable bracket.

[0014] Furthermore, two measuring parts are symmetrically provided along the circumference of the gear shaft.

[0015] Furthermore, a support plate is provided on the threaded sleeve of the pull rod portion, and both ends of the support plate are fixedly connected to the gear box.

[0016] Furthermore, a sleeve is pre-installed on the top end of the pull rod portion and a torque wrench is connected via the sleeve.

[0017] By adopting the above technical solution, the utility model has the following beneficial effects:

[0018] (1) The utility model optimizes the pull rod part of the traditional measuring tool that can only perform lifting movement into a part that can move along the axial direction of the gear shaft and rotate relative to the gear shaft. Therefore, when measuring the axial clearance of the gear box bearing, the gear shaft can be rotated to simulate the actual use of the gear shaft, so that the tapered bearings are arranged in an orderly manner, and the uneven distribution of the gear box bearing balls caused by non-rotation and the inaccurate clearance value measurement are eliminated. Compared with the traditional method of directly pulling the gear shaft to measure the clearance, the utility model improves the measurement accuracy while achieving simple and efficient measurement of the axial clearance of the gear box bearing.

[0019] (2) The utility model realizes the rotation connection between the pull rod part and the connecting part through the bearing, and has a simple structure and smooth rotation.

[0020] (3) The utility model adopts ball bearings, which are flexible in rotation. Ball bearings have good rotation flexibility and are easy to align the bearings. At the same time, they have low friction, can withstand large axial loads, and have stable loads. They have high rigidity and can maintain a stable working state when the load changes.

[0021] (4) The utility model realizes the initial fixed installation of the bearing through interference fit, which is convenient for assembly.

[0022] (5) The utility model uses a pair of bearing pressure plates to axially limit the bearing after preliminary fixation, thereby ensuring the firmness of the bearing installation.

[0023] (6) The utility model provides a bearing seat with an annular boss structure, and by setting the position of the annular boss, the device can be directly used to measure the axial clearance of the gear box of the hollow gear shaft or the solid gear shaft, and has a wider range of applications.

[0024] (7) The measuring part of the utility model adopts a micrometer, which can read the reading directly and quickly, making measurement convenient and having high measurement accuracy.

[0025] (8) The utility model has two symmetrical measuring parts, which can measure the gear box clearance values ​​at two locations at the same time, reducing measurement errors and improving measurement accuracy.

[0026] (9) The utility model provides a support plate, and the pull rod portion can be moved axially along the gear shaft by rotating the pull rod portion, which is convenient for testing.

[0027] (10) The utility model adds a torque wrench, which not only allows the pull rod to be directly rotated by the torque wrench to facilitate testing, but also allows the rotation of the pull rod to be accurately controlled by a preset torque, so that the pull rod can achieve axial movement through rotation without excessive torque, thereby preventing the outer ring of the bearing to be tested from being pressed against the ball and unable to rotate, causing the bearing to be unable to be aligned and the clearance to be unable to be accurately measured; at the same time, forced rotation can be avoided, which causes abnormal wear of the inner and outer ring raceways of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings, wherein:

[0029] Figure 1 This is a simplified structural diagram of Example 1;

[0030] Figure 2 This is a simplified diagram of the assembly structure of Example 1, the gearbox, and the gear shaft;

[0031] Figure 3 This is a simplified structural diagram of Example 2.

[0032] The reference numerals in the accompanying drawings are:

[0033] Gear shaft 100 , gear box 200 , measuring part 1 , connecting part 2 , annular boss 2 - 1 , pull rod part 3 , bearing 4 , first bearing pressure plate 5 , second bearing pressure plate 6 , support plate 7 . DETAILED DESCRIPTION

[0034] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0035] (Example 1)

[0036] like Figure 1 and Figure 2 The illustrated gearbox large clearance measuring device includes a measuring portion 1, a connecting portion 2, and a pull rod portion 3. The connecting portion 2 is fixedly connected to the gear shaft 100. The pull rod portion 3 is rotatably mounted on the connecting portion 2 and can be moved axially along the gear shaft 100. The rotation axis of the pull rod portion 3 is aligned with the rotation axis of the gear shaft 100, ensuring that the pull rod portion 3 can pull the gear shaft 100 in a balanced manner during measurement. The measuring portion 1 is mounted on the gearbox 200, and the measuring end contacts the end face or measuring surface of the gear shaft. The measuring surface is arranged parallel to the end face of the gear shaft and is fixedly connected to the gear shaft in the axial direction, such as the surface on the connecting portion 2 that is parallel to the end face of the gear shaft, thereby measuring the axial displacement of the gear shaft relative to the gearbox and, in turn, the bearing clearance of the gearbox.

[0037] Specifically, the gear shaft of this embodiment is a hollow shaft, and the measuring part 1 is a dial indicator, which provides high measurement accuracy and allows for quick and direct reading, facilitating measurement. The dial indicator is mounted on the gearbox via an adjustable bracket, ensuring that the measuring end of the measuring part 1 maintains contact with the upper end surface of the connecting part 2. To improve measurement accuracy, this embodiment is equipped with two measuring parts, which are symmetrically arranged along the circumference of the gear shaft to reduce measurement errors.

[0038] The connecting portion 2 is a bearing seat. The top of the outer ring of the bearing seat is equipped with an outwardly extending annular boss 2-1. The outer wall of the bearing seat mates with the inner wall of the hollow gear shaft. The lower end face of the annular boss is screwed to the annular end face of the hollow gear shaft, securing the connecting portion 2 within the end face of the hollow gear shaft. A bearing 4 is interference fit between the inner ring of the bearing seat and the tie rod 3, providing a rotational connection. Bearing 4 is a ball bearing, offering flexible rotational flexibility and easy alignment. It also has low friction, can withstand high axial loads with stability, and possesses high rigidity, maintaining stable operation despite load fluctuations. A first bearing pressure plate 5 and a second bearing pressure plate 6 are screwed to the bearing seat and tie rod, respectively. The inner ring of the first bearing pressure plate 5 extends to the outer ring of the bearing, while the outer ring of the second bearing pressure plate 6 extends to the inner ring of the bearing 4. The bearing 4 is axially restrained between the bearing seat and the tie rod by the first and second bearing pressure plates 5 and 6. This embodiment first realizes the preliminary fixed installation of the bearing through interference fit, which is convenient for assembly, and then uses a pair of bearing pressure plates to axially limit the bearing after preliminary fixation to ensure the firmness of the bearing installation.

[0039] A support plate 7 is provided on the threaded sleeve of the pull rod portion 3, and both ends of the support plate 7 are fixedly connected to the gear box. By rotating the pull rod portion, the axial movement of the pull rod portion along the gear shaft can be achieved. In order to facilitate rotation, a sleeve is pre-installed on the top of the pull rod portion in this embodiment and a torque wrench is connected through the sleeve. The rotation of the pull rod portion can be accurately controlled by pre-setting the torque, so that it can achieve axial movement through rotation without excessive torque, thereby preventing the outer ring of the bearing to be tested from being pressed against the ball and unable to rotate, causing the bearing to be tested to be unable to be aligned, resulting in the inability to accurately measure the clearance, and at the same time, it can avoid forced rotation, which causes abnormal wear of the inner and outer ring raceways of the bearing.

[0040] The workflow of this embodiment is as follows: After installing the test device, rotate the gear shaft to align the gearbox's bearings 300 to be tested. Because the tie rod shaft and the gear shaft rotate in unison, the rotation of the gear shaft does not interfere with the measuring device. Using a torque wrench, rotate the tie rod until it moves axially to its first limit. The measuring unit is adjusted to zero. The torque wrench is then rotated in the opposite direction to move the tie rod circumferentially to its second limit. The measurement unit directly reads the change in value, which is then used to calculate the gearbox's axial clearance.

[0041] (Example 2)

[0042] The structure of this embodiment is similar to that of embodiment 1. Figure 3 As shown, the gear shaft is a solid shaft, and the annular boss 2-1 is provided on the outer ring of the bearing seat, which is fixedly connected to the end face of the solid gear shaft and the bottom face fits with the end face of the solid gear shaft, so that the clearance of the gear box of the solid gear shaft can be directly measured.

[0043] The utility model optimizes the pull rod part of the traditional measuring tool that can only perform lifting movement to enable it to move along the axial direction of the gear shaft and rotate relative to the gear shaft. Therefore, when measuring the axial clearance of the gear box bearing, the gear shaft can be rotated to simulate the actual use of the gear shaft, so that the tapered bearings are arranged in an orderly manner, and the phenomenon of uneven distribution of gear box bearing balls and inaccurate clearance value measurement caused by non-rotation is eliminated. Compared with the traditional method of directly pulling the gear shaft to measure the clearance, the utility model improves the measurement accuracy while realizing simple and efficient measurement of the axial clearance of the gear box bearing.

[0044] The specific embodiments described above further illustrate the purpose, 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 scope of protection of the present invention.

Claims

1. A gearbox large clearance measuring device, characterized by: It includes a measuring part and a connecting part fixedly connected to the gear shaft, a pull rod part that is rotatably mounted on the connecting part and is movable along the axial direction of the gear shaft, the rotation axis of the pull rod part is the same as the rotation axis of the gear shaft, the measuring part is mounted on the gear box, and the measuring end is in contact with the end face or measuring surface of the gear shaft, the measuring surface is arranged parallel to the end face of the gear shaft and is fixedly connected to the gear shaft along the axial direction.

2. A gearbox large clearance measuring device according to claim 1, characterized in that: The connecting portion is a bearing seat fixedly mounted on the end face of the gear shaft, a bearing is coaxially connected between the pull rod portion and the bearing seat, and the outer ring and inner ring of the bearing are fixedly connected to the bearing seat and the pull rod portion respectively.

3. A gearbox large clearance measuring device according to claim 2, characterized in that: The bearing is a ball bearing.

4. A gearbox large clearance measuring device according to claim 2, characterized in that: The outer ring and the inner ring of the bearing are interference fit with the inner ring of the bearing seat and the outer ring of the pull rod part respectively.

5. A gearbox large clearance measuring device according to claim 4, characterized in that: The two ends of the bearing are respectively provided with a first bearing pressure plate and a second bearing pressure plate fixed to the bearing seat and the pull rod part by screws. The inner ring of the first bearing pressure plate extends to the outer ring of the bearing, and the outer ring of the second bearing pressure plate extends to the inner ring of the bearing. The bearing is axially limited and installed between the bearing seat and the pull rod part by the first bearing pressure plate and the second bearing pressure plate.

6. The gearbox large clearance measuring device according to claim 2, characterized in that: The outer ring of the bearing seat is provided with an annular boss extending outward. When the gear shaft is a solid shaft, the annular boss is fixedly connected to the end face of the solid gear shaft and the bottom face is in contact with the end face of the solid gear shaft; when the gear shaft is a hollow shaft, the outer wall of the bearing seat is in contact with the inner wall of the hollow gear shaft, the annular boss is located at the top of the bearing seat and the lower end face is fixedly connected to the annular end face of the hollow gear shaft by screws.

7. The gearbox large clearance measuring device according to claim 1, characterized in that: The measuring part is a dial indicator, which is mounted on the gear box through an adjustable bracket.

8. The gearbox large clearance measuring device according to claim 1, characterized in that: Two measuring parts are symmetrically provided along the circumference of the gear shaft.

9. The gearbox large clearance measuring device according to claim 1, characterized in that: A support plate is provided on the threaded sleeve of the pull rod portion, and both ends of the support plate are fixedly connected to the gear box.

10. The gearbox large clearance measuring device according to claim 9, characterized in that: The top end of the pull rod is pre-installed with a sleeve and is connected to a torque wrench through the sleeve.

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