Clearance measuring device of motor bearing

Abstract

The utility model discloses a clearance measuring device for a motor bearing, and belongs to the technical field of measurement. Comprising a workbench, a push rod force application assembly and a displacement sensor, the push rod force application assembly comprises a servo push rod, a lifting head, a jacking fixing plate, an adjusting structure, a force measurement sensor, an adjusting support and a guide rod, the servo push rod is fixed to the workbench, the upper end of a telescopic rod of the servo push rod is fixedly connected with the jacking fixing plate, and the guide rod is arranged on the workbench in a sliding mode; the extension rod is detachably arranged at the circle center of the end part of the rotating shaft and is coaxial with the rotating shaft; if the rotating shaft is short, an extension rod is arranged; if the rotating shaft is long, the extension rod is not arranged; the force transducer is arranged along the direction of the rotating shaft; the lifting head is arranged on the lower side of a preset position of the rotating shaft or the extension rod; the displacement sensor is vertically arranged, located on the upper side of the rotating shaft and close to a bearing of the motor. During detection, when a measurement value of the force measurement sensor reaches a preset value, displacement is detected through the displacement sensor.

Description

Technical Field

[0001] This utility model belongs to the field of measurement technology, and specifically relates to a device for measuring the clearance of motor bearings. Background Technology

[0002] In recent years, with the rapid development of high-speed rail, the number of traditional diesel locomotives in the railway industry has been decreasing. However, diesel locomotives still play an irreplaceable role. In harsh icy and snowy conditions, diesel locomotives remain the first choice for railway passenger cars. Related components on diesel locomotives also require regular maintenance and inspection. As a key component of diesel locomotives, the motor naturally requires better maintenance and inspection; any faults or defects should be repaired or replaced promptly. The clearance of the motor bearings is a key parameter when the motor leaves the factory or is inspected.

[0003] When the clearance of a motor bearing is too small, it leads to increased friction between the rolling elements and the raceway, making it difficult for a lubricating film to form and accelerating wear. It can also cause excessive bearing temperature rise due to frictional heat, accelerating grease aging and even sintering. Conversely, excessive clearance results in uneven stress distribution between the rolling elements and the raceway, causing localized fatigue spalling. A reasonable clearance balances frictional heat and heat dissipation, maintaining a stable operating temperature. Therefore, after a period of use on a railway diesel locomotive, the motor needs to be disassembled for inspection to determine if the bearing clearance meets the initial design requirements.

[0004] Existing technologies can employ corresponding structures to detect the clearance of motor bearings.

[0005] For example, patent application number CN202222466819.X discloses an automatic measuring device for traction motor bearing clearance, including a base, a roller drive belt fixedly mounted on the base, the roller drive belt being electrically connected to an external power source, a worktable slidably mounted on the roller drive belt, a motor body detachably mounted on the worktable, a lifting assembly fixedly mounted on the outside of the base, and a detection assembly detachably mounted on the outside of the motor body. The lifting assembly includes a hydraulic rod and a pressure sensor. The hydraulic rod is fixedly mounted on the outside of the base and electrically connected to an external power source. A pressure sensor is fixedly mounted on the output end of the hydraulic rod and electrically connected to an external power source. The detection assembly includes a dial indicator and a bracket. The bracket is snapped onto the outside of the motor body, and the dial indicator is fixedly mounted on the other end of the bracket. When the output end of the dial indicator contacts the output end of the motor body, it is connected to the output end of the motor body.

[0006] For example, patent application number CN202011473321.5 discloses a bearing radial clearance measuring device after assembly of motor products. It includes a frame with movable wheels, an extension rod housed in the frame and connectable to the motor's shaft, a push rod force application component corresponding to the extension rod, a displacement sensor, and a PLC controller that controls the entire measuring device and displays the measurement results. The push rod force application component and the displacement sensor are respectively connected to the PLC controller. The extension rod is coaxially connected to the horizontally positioned shaft and positioned in conjunction with the push rod force application component. It rises as the push rod force application component extends, thereby lifting one end of the shaft upwards. The displacement sensor is located on the end face of the lifted end of the shaft. The push rod force application component includes a servo push rod mounted vertically in the frame and a lifting head mounted on the upper end of the servo push rod. The top surface of the lifting head is concave in a V-shape, and a mating groove for the extension rod is opened at the center line. The extension rod, coaxially connected to the horizontally positioned shaft, enters the mating groove as the servo push rod extends. The lifting head is located on the top of the frame, and a force sensor that can contact the extension rod is installed in the groove. Both the servo push rod and the force sensor are connected to the PLC controller.

[0007] In existing technologies, as shown in the patent application number CN202222466819.X, the rotating shaft is directly lifted by a hydraulic rod, and the displacement value is obtained by a dial indicator, which cannot achieve fully automatic measurement. In addition, it is necessary to move the motor so that the motor's rotating shaft is aligned with the hydraulic rod and the dial indicator, and the motor is very heavy and difficult to move. Summary of the Invention

[0008] To address the aforementioned problems, this utility model provides a device for measuring the clearance of motor bearings, which can automate the measurement process. Furthermore, during testing, this device eliminates the need to adjust the motor's position; the adjustment structure and bracket can be adjusted to position the displacement sensor and the lifting head on the upper and lower sides of the rotating shaft, respectively, making operation convenient. The technical solution is as follows:

[0009] This utility model provides a device for measuring the clearance of a motor bearing, including a worktable and a push rod force application assembly and a displacement sensor 2 on it. The push rod force application assembly includes a servo push rod 3 and a lifting head 8. The servo push rod 3 is vertically arranged, and the lifting head 8 is arranged along the direction of the motor's shaft 1. The push rod force application assembly also includes a lifting fixing plate 5 above the worktable that can move up and down, an adjustment structure 6 on the lifting fixing plate 5, a force sensor 7 between the adjustment structure 6 and the lifting head 8, an adjustment bracket 9 on the worktable for fixing the displacement sensor 2, and a guide rod 10 on the lower side of the lifting fixing plate 5. The servo push rod 3 is fixed to the worktable, and the upper end of its telescopic rod is fixedly connected to the lifting fixing plate 5. The guide rod 10 slides. The system is set on a workbench; the extension rod is detachably located at the center of the end of the rotating shaft 1 and is coaxial with the rotating shaft 1; if the rotating shaft 1 is short, an extension rod is provided; if the rotating shaft 1 is long, an extension rod is not provided; the adjustment structure 6 can be adjusted along the direction of the rotating shaft 1 and perpendicular to the direction of the rotating shaft 1; the adjustment bracket 9 allows the displacement sensor 2 to be adjusted along the direction of the rotating shaft 1, perpendicular to the direction of the rotating shaft 1, and vertically; the force sensor 7 is set along the direction of the rotating shaft 1; the lifting head 8 is placed below the rotating shaft 1 or the extension rod at a predetermined position; the displacement sensor 2 is set vertically, located on the upper side of the rotating shaft 1, and is set near the bearing of the motor; during detection, when the measured value of the force sensor 7 reaches the predetermined value, the displacement is detected by the displacement sensor.

[0010] Furthermore, the push rod force application component in this embodiment of the present invention also includes a base fixing plate 4, which is fixed on the workbench, the lifting fixing plate 5 is located directly above the base fixing plate 4, the servo push rod 3 is fixed on the lower side of the base fixing plate 4, the adjusting bracket 9 is fixed on the base fixing plate 4, and the guide rod 10 is slidably disposed on the base fixing plate 4.

[0011] The motor is placed on the conveying structure, the conveying direction of the conveying structure is perpendicular to the rotating shaft 1, and the worktable is located next to the conveying structure and is a movable worktable.

[0012] Specifically, in this embodiment of the present invention, there is one guide rod 10, which is arranged side by side with the servo push rod 3 in the direction of the rotating shaft 1, and is located on the side of the servo push rod 3 away from the rotating shaft 1; the servo push rod 3 is arranged close to the rotating shaft 1.

[0013] Specifically, in this embodiment of the present invention, the base fixing plate 4 and the lifting fixing plate 5 are both horizontally arranged, both along the direction of the rotating shaft 1, and both are rectangular plates; the adjustment structure 6 is located at the end of the lifting fixing plate 5 near the rotating shaft 1.

[0014] In this embodiment of the present invention, the adjustment structure 6 includes a transverse slide rail on the lifting fixing plate 5 and perpendicular to the rotating shaft 1, a transverse slide block slidably disposed on the transverse slide rail, a longitudinal slide rail disposed on the transverse slide block and along the direction of the rotating shaft 1, and a longitudinal slide block slidably disposed on the longitudinal slide rail. The transverse slide block and the longitudinal slide block are respectively locked and fixed on the transverse slide rail and the longitudinal slide rail by corresponding locking members. The transverse slide rail is located at one end of the lifting fixing plate 5 near the rotating shaft 1. The lower side of the force sensor 7 at the end away from the rotating shaft 1 is fixed on the longitudinal slide block. The lifting head 8 is disposed on the upper side of the other end of the force sensor 7.

[0015] In this embodiment of the invention, the upper side of the lifting head 8 is provided with a V-shaped groove that cooperates with the rotating shaft 1; the V-shaped groove is arranged along the direction of the rotating shaft 1.

[0016] In this embodiment of the invention, the adjustment bracket 9 includes a lower horizontal bar, a vertical bar, and an upper horizontal bar. Both the lower and upper horizontal bars are horizontally arranged and have rings at both ends. The vertical bar is vertically arranged. The ring at the end of the lower horizontal bar away from the rotating shaft 1 is fixed to the lower side of the base fixing plate 4 near the rotating shaft 1 by a pin, and the other end of the lower horizontal bar is sleeved and fixed to the lower part of the vertical bar. The displacement sensor 2 is fixed to the ring at one end of the upper horizontal bar, and the ring at the other end of the upper horizontal bar is sleeved and fixed to the upper part of the vertical bar.

[0017] Specifically, the clearance measuring device in this embodiment of the present invention is used to detect the motor of a railway diesel locomotive; the force sensor 7 is model CY3018,0-500N; the displacement sensor 2 is a Keyence displacement sensor with a measuring stroke of 0-5mm and a measuring accuracy of 0.001mm.

[0018] The beneficial effects of the technical solution provided by this utility model embodiment are as follows: This utility model embodiment provides a motor bearing clearance measuring device, which can automatically realize the measurement (acquiring the values ​​of the force sensor and displacement sensor); in addition, during the detection process, there is no need to adjust the position of the motor. The adjustment structure and adjustment bracket can be adjusted to place the displacement sensor and the lifting head on the upper and lower sides of the rotating shaft respectively, making operation convenient. Furthermore, since the adjustment structure and adjustment bracket are adjustable, it can be applied to various specifications of motors or various scenarios (such as different shaft lengths, different detection positions, or different support positions); in addition, the stability of the lifting is ensured by setting the guide rod. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the motor bearing clearance measuring device in an embodiment of this utility model.

[0020] In the diagram: 1. Rotary shaft, 2. Displacement sensor, 3. Servo push rod, 4. Base fixing plate, 5. Lifting fixing plate, 6. Adjustment structure, 7. Force sensor, 8. Lifting head, 9. Adjustment bracket, 10. Guide rod. Detailed Implementation

[0021] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0022] Example 1

[0023] See Figure 1 Example 1 provides a motor bearing clearance measuring device, including a worktable and a push rod force application assembly and a displacement sensor 2 on it.

[0024] The push rod force application component includes a servo push rod 3, a base fixing plate 4, a lifting fixing plate 5, an adjustment structure 6, a force sensor 7, a lifting head 8, an adjustment bracket 9, and a guide rod 10.

[0025] The base fixing plate 4 is horizontally arranged along the direction of the rotating shaft 1. Specifically, it is a rectangular plate and is fixed on the worktable.

[0026] Among them, the lifting fixing plate 5 is located directly above the base fixing plate 4. It can move up and down, is horizontally set, and is set along the direction of the rotating shaft 1. Specifically, it is a rectangular plate.

[0027] The servo push rod 3 is fixed on the lower side of the base fixing plate 4. It is vertically arranged and is used to drive the lifting fixing plate 5 to move up and down. The upper end of its telescopic rod is fixedly connected to the lifting fixing plate 5, which is specifically an electric lifting rod.

[0028] The adjustment structure 6 is mounted on the lifting fixing plate 5 and can be adjusted along the direction of the rotating shaft 1 and perpendicular to the rotating shaft 1. Specifically, the adjustment structure 6 is located at the end of the lifting fixing plate 5 closest to the rotating shaft 1. More specifically, the adjustment structure 6 includes a transverse slide rail on the lifting fixing plate 5 perpendicular to the rotating shaft 1, a transverse slide block slidably mounted on the transverse slide rail, a longitudinal slide rail on the transverse slide block and arranged along the rotating shaft 1, and a longitudinal slide block slidably mounted on the longitudinal slide rail. The transverse slide block and the longitudinal slide block are respectively locked and fixed to the transverse slide rail and the longitudinal slide rail by corresponding locking members. Adjustment can be achieved by loosening the locking members. The transverse slide rail is located at the end of the lifting fixing plate 5 closest to the rotating shaft 1.

[0029] The force sensor 7 is positioned along the direction of the rotating shaft 1, between the adjustment structure 6 and the lifting head 8, and is horizontally positioned. Specifically, the lower side of the end of the force sensor 7 away from the rotating shaft 1 is fixed on the longitudinal slide, and the lifting head 8 is positioned on the upper side of the other end of the force sensor 7 (the end closer to the rotating shaft 1).

[0030] The lifting head 8 is positioned along the direction of the motor's shaft 1, and its upper side has a V-shaped groove that mates with the shaft 1. It is located below the predetermined position (set according to measurement requirements) of the shaft 1 or the extension rod. The V-shaped groove is positioned along the direction of the shaft 1. The extension rod is detachably located at the center of the end of the shaft 1 (corresponding to a circular hole for inserting and fixing the extension rod). It is coaxial with the shaft 1 and is a smaller circular rod than the shaft 1, with a length of 3-10 cm. If the shaft 1 is short, an extension rod is provided. If the shaft 1 is long, an extension rod is not provided.

[0031] The guide rod 10 is vertically arranged and fixed to the lower side of the lifting fixed plate 5. It is slidably mounted on the base fixed plate 4 and is used to ensure the stability of the lifting fixed plate 5 in its up and down movement.

[0032] The displacement sensor 2 is fixed to the base fixing plate 4 via an adjusting bracket 9, allowing adjustment of the displacement sensor 2 along the direction of the rotating shaft 1, perpendicular to the rotating shaft 1, and vertically. Specifically, the adjusting bracket 9 includes a lower horizontal bar, a vertical bar, and an upper horizontal bar. Both the lower and upper horizontal bars are horizontally positioned and have rings (specifically, circular rings) at both ends. The vertical bar is vertically positioned and is a circular bar that mates with the rings. The ring at the end of the lower horizontal bar furthest from the rotating shaft 1 is fixed to the lower side of the base fixing plate 4 near the rotating shaft 1 by a pin (locked by a corresponding locking bolt), and its other end is fitted and fixed (locked by a corresponding locking bolt) to the lower part of the vertical bar. The displacement sensor 2 is fixed to the ring at one end of the upper horizontal bar, and the ring at the other end of the upper horizontal bar is fitted and fixed (locked by a corresponding locking bolt) to the upper part of the vertical bar. Adjustment is achieved by loosening the locking bolts.

[0033] The displacement sensor 2 is vertically positioned on the upper side of the rotating shaft 1, close to the bearing of the motor. During detection, when the measured value of the force sensor 7 reaches a predetermined value (e.g., 250N), the displacement is detected by the displacement sensor.

[0034] Example 2

[0035] See Figure 1 Example 2 provides a motor bearing clearance measuring device, which is basically the same as the structure of Example 1. The difference is that the motor in this example is placed on the conveying structure, the conveying direction of the conveying structure is perpendicular to the rotating shaft 1, and the worktable is located next to the conveying structure and is a movable worktable (with rollers at the bottom).

[0036] Example 3

[0037] See Figure 1Example 3 provides a motor bearing clearance measuring device, whose structure is basically the same as that of Example 2, except that: in this example, there is only one guide rod 10, which is arranged side by side with the servo push rod 3 in the direction of the rotating shaft 1, and is located on the side of the servo push rod 3 away from the rotating shaft 1. The servo push rod 3 is located close to the rotating shaft 1.

[0038] Example 4

[0039] See Figure 1 Example 4 provides a motor bearing clearance measuring device, whose structure is basically the same as that of Example 3, except that: in this example, the motor is placed on the conveying structure in the front-to-back direction, and its shaft 1 is located at the front. The worktable is located in front of the conveying structure. The base fixing plate 4, the lifting fixing plate 5, the force sensor 7, the lifting head 8, and the longitudinal slide rail are all arranged in the front-to-back direction. The transverse slide rail is arranged in the left-to-right direction and is located at the rear end of the lifting fixing plate 5. The servo push rod 3 is located at the rear of the base fixing plate 4, and the guide rod 10 is located at the front of the base fixing plate 4. The lower front end of the force sensor 7 is fixed to the longitudinal slide, and the lifting head 8 is located at the upper rear end of the force sensor 7. The front end of the lower crossbar is fixedly connected to the left rear end of the base fixing plate 4, and it is arranged diagonally to the left from front to back. Its rear end is fixedly connected to the lower part of the vertical rod. The upper crossbar is arranged in the left-to-right direction, and its left end is fixedly connected to the upper part of the vertical rod. Its right end is fixedly connected to the displacement sensor 2.

[0040] Example 5

[0041] Example 5 provides a motor bearing clearance measuring device, whose structure is basically the same as that of Example 4, except that: in this example, the rotating shaft 1 is shorter, so an extension rod is provided (located at the front end of the rotating shaft 1). The lifting head 8 is placed below the predetermined position of the extension rod. The displacement sensor 2 is located on the upper side of the rotating shaft 1, close to the bearing of the motor.

[0042] Example 6

[0043] See Figure 1 Example 6 provides a motor bearing clearance measuring device, whose structure is basically the same as that of Example 4, except that: in this example, the rotating shaft 1 is longer, so no extension rod is provided. The lifting head 8 is placed on the lower side of a predetermined position on the rotating shaft 1. The displacement sensor 2 is located on the upper side of the rotating shaft 1, close to the motor bearing.

[0044] Example 7

[0045] See Figure 1Example 7 provides a clearance measuring device for motor bearings, whose structure is basically the same as that of Example 1, except that the clearance measuring device in this example is used to detect the motor of a railway diesel locomotive. The force sensor 7 is model CY3018,0-500N. The displacement sensor 2 is a Keyence displacement sensor with a measuring stroke of 0-5mm and a measuring accuracy of 0.001mm.

[0046] Example 8

[0047] Example 8 provides a clearance measurement method, using the motor bearing clearance measurement device described in any one of Examples 1-7, the method comprising:

[0048] (1) Place the motor to be repaired near the device.

[0049] (2) Move the worktable so that the displacement sensor 2 contacts the upper side of the motor shaft 1 under test and is close to the bearing.

[0050] (3) Adjust the structure so that the lifting head 8 of the device is directly below the predetermined position of the rotating shaft.

[0051] (4) Power on the device so that the sensors and push rod force application components can work normally.

[0052] (5) At the start of the test: The system software reads the value of displacement sensor 2 and records the initial position of shaft 1. The servo motor is controlled to raise the servo push rod 3, so that the lifting head 8 of the device contacts the lower side of shaft 1. The servo push rod 3 continues to rise, and the force sensor 7 displays a value. When the software detects that the value of the force sensor 7 reaches the process requirement value (e.g., 250N), the servo push rod 3 stops rising. The software records the data of displacement sensor 2 in this state and uses the data from force sensor 7 and displacement sensor 2 to determine whether the bearing clearance of the motor under test is within the process requirements. If the process requirements are met, the motor can proceed to the next maintenance step. If the process requirements are not met, the motor needs to be disassembled and the bearing clearance readjusted.

[0053] (6) At the end of the test: Control the servo push rod 3 to descend via the system software, so that the lifting head 8 of the device is removed from the rotating shaft 1. Adjust the position of the displacement sensor 2 to remove it from the rotating shaft 1. Turn off the power and remove the device to move the motor under test.

[0054] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for measuring the clearance of a motor bearing, comprising a worktable and a push rod force application assembly and a displacement sensor (2) thereon, wherein the push rod force application assembly comprises a servo push rod (3) and a lifting head (8), the servo push rod (3) being vertically arranged, and the lifting head (8) being arranged along the direction of the motor's rotating shaft (1); characterized in that, The push rod force application assembly also includes a lifting fixing plate (5) above the worktable that can move up and down, an adjustment structure (6) on the lifting fixing plate (5), a force sensor (7) between the adjustment structure (6) and the lifting head (8), an adjustment bracket (9) on the worktable for fixing the displacement sensor (2), and a guide rod (10) on the lower side of the lifting fixing plate (5). The servo push rod (3) is fixed on the worktable and its upper end of the telescopic rod is fixedly connected to the lifting fixing plate (5). The guide rod (10) is slidably disposed on the worktable. The extension rod is detachably disposed at the center of the end of the rotating shaft (1) and is coaxial with the rotating shaft (1). If the rotating shaft (1) is short, an extension rod is provided. If the shaft (1) is long, no extension rod is provided; the adjustment structure (6) can be adjusted along the direction of the shaft (1) and perpendicular to the direction of the shaft (1); the adjustment bracket (9) can allow the displacement sensor (2) to be adjusted along the direction of the shaft (1), perpendicular to the direction of the shaft (1), and vertically; the force sensor (7) is set along the direction of the shaft (1); the lifting head (8) is placed on the lower side of the shaft (1) or the extension rod at a predetermined position; the displacement sensor (2) is set vertically, located on the upper side of the shaft (1), and is set close to the bearing of the motor; during detection, when the measured value of the force sensor (7) reaches the predetermined value, the displacement is detected by the displacement sensor.

2. The motor bearing play measuring device of claim 1, wherein, The push rod force application assembly also includes a base fixing plate (4), which is fixed on the workbench. The lifting fixing plate (5) is located directly above the base fixing plate (4). The servo push rod (3) is fixed on the lower side of the base fixing plate (4). The adjusting bracket (9) is fixed on the base fixing plate (4). The guide rod (10) is slidably disposed on the base fixing plate (4).

3. The motor bearing play measuring apparatus of claim 1, wherein, The motor is placed on the conveying structure, the conveying direction of which is perpendicular to the rotating shaft (1), and the worktable is located next to the conveying structure and is a movable worktable.

4. The motor bearing play measuring apparatus of claim 2, wherein, The guide rod (10) is one in number, which is arranged side by side with the servo push rod (3) in the direction of the rotating shaft (1), and is located on the side of the servo push rod (3) away from the rotating shaft (1); the servo push rod (3) is arranged close to the rotating shaft (1).

5. The motor bearing play measuring apparatus of claim 4, wherein, The base fixing plate (4) and the lifting fixing plate (5) are both horizontally arranged, both along the direction of the rotating shaft (1), and both are rectangular plates; the adjustment structure (6) is located at the end of the lifting fixing plate (5) near the rotating shaft (1).

6. The motor bearing play measuring apparatus of claim 5, wherein, The adjustment structure (6) includes a transverse slide rail on the lifting fixing plate (5) and perpendicular to the rotating shaft (1), a transverse slide block slidably disposed on the transverse slide rail, a longitudinal slide rail disposed on the transverse slide block and along the direction of the rotating shaft (1), and a longitudinal slide block slidably disposed on the longitudinal slide rail. The transverse slide block and the longitudinal slide block are respectively locked and fixed on the transverse slide rail and the longitudinal slide rail by corresponding locking parts. The transverse slide rail is located at one end of the lifting fixing plate (5) near the rotating shaft (1). The lower side of the end of the force sensor (7) away from the rotating shaft (1) is fixed on the longitudinal slide block. The lifting head (8) is disposed on the upper side of the other end of the force sensor (7).

7. The motor bearing play measuring apparatus of claim 1, wherein, The upper side of the lifting head (8) is provided with a V-shaped groove that cooperates with the rotating shaft (1); the V-shaped groove is arranged along the direction of the rotating shaft (1).

8. The motor bearing play measuring apparatus of claim 1, wherein, The adjustment bracket (9) includes a lower horizontal bar, a vertical bar and an upper horizontal bar. The lower horizontal bar and the upper horizontal bar are both horizontally arranged and both ends are provided with rings. The vertical bar is vertically arranged. The ring at the end of the lower horizontal bar away from the rotating shaft (1) is fixed to the lower side of the base fixing plate (4) near the rotating shaft (1) by a pin. The other end of the lower horizontal bar is sleeved and fixed to the lower part of the vertical bar. The displacement sensor (2) is fixed on the ring at one end of the upper horizontal bar. The ring at the other end of the upper horizontal bar is sleeved and fixed to the upper part of the vertical bar.

9. The motor bearing play measuring apparatus of claim 1, wherein, The clearance measuring device is used to detect the motor of a railway diesel locomotive; the force sensor (7) is model CY3018,0-500N; the displacement sensor (2) is a Keyence displacement sensor with a measuring stroke of 0-5mm and a measuring accuracy of 0.001mm.

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