Speed reducer bearing pre-tightening state detection wrench

Abstract

A speed reducer bearing pre-tightening state detection wrench comprises a spline sleeve capable of being matched with a spline of an input shaft of a speed reducer, a torsion handle, a torque detection shaft coaxially connected between the spline sleeve and the torsion handle, a torsion measuring strain gauge attached to the torque detection shaft and a torque displayer installed on the torsion handle. A signal connecting wire of the torque measuring strain gauge is connected with the torque display. The torque detection shaft rotates along with rotation of the reducer input shaft driven by the spline sleeve. The device realizes the detection of the pre-tightening state of the reducer bearing, ensures the quality stability of the detection of the pre-tightening state of the bearing, is simple in structure, does not need to be connected with power equipment, is convenient for hand-held operation detection, realizes the real-time display of a detection value, is convenient for first-line production and use, is simple to assemble and separate from the reducer input shaft, and is high in detection efficiency. Requirements on placing and assembling of the speed reducer are low, and economy and practicability are achieved.

Description

Technical Field

[0001] This utility model relates to a wrench for detecting the preload condition of a reducer bearing, used for detecting the preload condition of a reducer bearing. Background Technology

[0002] The reducers in new energy electric vehicles operate at high speeds, with the bearings inside the reducers reaching speeds of tens of thousands of revolutions per minute. Improper bearing preload can lead to a series of performance problems as the speed increases, including excessive wear, overheating, shortened lifespan, abnormal vibration and noise, uneven load distribution, installation difficulties, increased starting torque, decreased lubricant performance, reduced system efficiency, increased maintenance costs, and increased risk of failure. Therefore, bearing preload directly affects the stability and reliability of the reducer during high-speed operation, necessitating testing of the preload condition of the reducer bearings after installation.

[0003] Currently, the main method for testing bearing preload is to use automated testing equipment. However, this method is costly and has high requirements for equipment installation and assembly with the reducer. If a regular torque wrench is used for testing, the testing quality is unstable, and the equipment has poor compatibility with the reducer input shaft, making the torsion operation inconvenient. Utility Model Content

[0004] The reducer bearing preload detection wrench provided by this utility model can detect the preload of reducer bearings, ensuring the quality and stability of bearing preload detection. It has a simple structure, does not require connection to power equipment, is easy to operate by hand, and can display the detection value in real time, making it convenient for use in front-line production. It is simple to assemble and detach from the reducer input shaft, has high detection efficiency, low requirements for the placement and assembly of the reducer, and is economical and practical.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] The reducer bearing preload detection wrench includes a splined sleeve that can be splined with the reducer input shaft, a torsion handle, a torque detection shaft coaxially connected between the splined sleeve and the torsion handle, a torque strain gauge mounted on the torque detection shaft, and a torque display mounted on the torsion handle. The signal wiring of the torque strain gauge is connected to the torque display. The torque detection shaft is torsiond as the splined sleeve drives the reducer input shaft to rotate.

[0007] Preferably, the torque detection shaft includes a connecting section coaxially connected to the torsion handle, a torsion section coaxially connected to the spline sleeve, and a flat plate integrally formed between the connecting section and the torsion section. The diameter of the torsion section is smaller than the diameter of the connecting section, and the diameter of the connecting section is smaller than the diameter of the flat plate. Torque strain gauges are mounted on the torsion section, and the diameter of the torsion section is not greater than one-fifth of the outer diameter of the spline sleeve.

[0008] Preferably, the number of torsional strain gauges is multiple, and they are evenly spaced along the circumference of the torsional segment.

[0009] Preferably, the torsion section is fitted with a protective sleeve made of two joined halves to ensure that the sleeve is fixedly connected to the flat plate.

[0010] Preferably, the torsion handle includes an inner ring coaxially connected to the connecting section and an outer ring connected to the inner ring via a connecting rod, with a torque display mounted on the inner ring.

[0011] Preferably, the torque detection shaft and the spline sleeve are integrally formed.

[0012] The beneficial effects of the utility model are:

[0013] This utility model discloses a wrench for detecting the preload condition of a reducer bearing. During testing, a splined sleeve is fitted with the splined engagement of the reducer input shaft. The torsion handle is manually rotated, transmitting torque through the torque detection shaft and splined sleeve to the reducer input shaft, causing the shaft system and bearings within the reducer to move. A torsional strain gauge detects the torsional deformation of the torque detection shaft during torque transmission and transmits the detection signal to a torque display. The torque display calculates and displays the received detection signal, thus providing a precise measurement of the frictional torque between the bearing and the shaft in the reducer. Since the bearing preload affects the bearing's frictional force and is related to the gripping torque of the drive shaft, the preload during bearing assembly... Different shafts require different rotational torques. Therefore, by accurately measuring the frictional torque between the bearing and the shaft, the bearing preload can be detected, thus enabling the detection of the bearing preload status in the reducer. A splined sleeve is used to apply torque to the reducer input shaft, driving the shaft system and bearing to rotate. The torque value displayed on the torque display is used to determine the bearing preload status, ensuring the quality and stability of the bearing preload status detection. The detection wrench has a simple structure, requires no connection to power equipment, is easy to operate by hand, and displays the detection values ​​in real time, making it convenient for front-line production. It is simple to assemble and disassemble with the reducer input shaft, has high detection efficiency, and has low requirements for the placement and assembly of the reducer, making it economical and practical. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a wrench for checking the preload state of the reducer bearing when only one protective sleeve is installed.

[0015] Figure 2 This is a front view of a wrench for checking the preload condition of the reducer bearing when the protective sleeve is not installed.

[0016] Figure 3 This is a schematic diagram of a wrench for checking the preload status of the reducer bearing when the protective sleeve is not installed. Detailed Implementation

[0017] The following combination Figures 1-3 The embodiments of this utility model will be described in detail below.

[0018] The reducer bearing preload detection wrench includes a splined sleeve 1 that can be splined with the reducer input shaft, a torsion handle 2, a torque detection shaft 3 coaxially connected between the splined sleeve 1 and the torsion handle 2, a torque strain gauge 4 mounted on the torque detection shaft 3, and a torque display 5 mounted on the torsion handle 2. The signal wiring of the torque strain gauge 4 is connected to the torque display 5. The torque detection shaft 3 is torsiond as the splined sleeve 1 drives the reducer input shaft to rotate.

[0019] The aforementioned reducer bearing preload detection wrench, during testing, involves aligning the splined sleeve 1 with the splined engagement of the reducer input shaft. Manually rotating the torsion handle 2 transmits torque through the torque detection shaft 3 and splined sleeve 1 to the reducer input shaft, driving the shaft system and bearings within the reducer. The torque strain gauge 4 detects the torsional deformation of the torque detection shaft 3 during torque transmission and transmits the detection signal to the torque display 5. The torque display calculates and displays the received detection signal, thus providing a precise measurement of the frictional torque between the bearing and shaft in the reducer. Since the bearing preload affects the bearing's frictional force and is related to the gripping torque of the drive shaft rotation, the preload during bearing assembly... Different tightness requires different rotational torques for the rotating shaft system. Therefore, the bearing preload can be detected by accurately measuring the frictional torque between the bearing and the shaft, thus enabling the detection of the bearing preload status in the reducer. A splined sleeve 1 is used to apply torque to the reducer input shaft to drive the shaft system and bearing to rotate. The torque value displayed on the torque display 5 is used to determine the bearing preload status, ensuring the quality and stability of the bearing preload status detection. The detection wrench has a simple structure, requires no connection to power equipment, is easy to operate by hand, and displays the detection values ​​in real time, making it convenient for front-line production. It is simple to assemble and detach from the reducer input shaft, has high detection efficiency, low requirements for reducer placement and assembly, and is economical and practical.

[0020] The torque detection shaft 3 includes a connecting section 31 coaxially connected to the torsion handle 2, a torsion section 32 coaxially connected to the spline sleeve 1, and a flat plate 33 integrally formed between the connecting section 31 and the torsion section 31. The diameter of the torsion section 32 is smaller than the diameter of the connecting section 31, and the diameter of the connecting section 31 is smaller than the diameter of the flat plate 33. The torsion strain gauge 4 is mounted on the torsion section 32, and the diameter of the torsion section 32 is no greater than one-fifth of the outer diameter of the spline sleeve 1. The diameter of the torsion section 32 is much smaller than the outer diameter of the spline sleeve 1, which makes it easier to generate torsion during torque transmission, thereby improving the detection sensitivity of the strain gauge 4 and ensuring the reliability of the detection.

[0021] The torsion strain gauges 4 are multiple in number and evenly spaced along the circumference of the torsion section 32. These torsion strain gauges 4 are the strain gauges used in torque sensors. Multiple torsion strain gauges 4 simultaneously sense and detect the torsion of the torsion section 32 and transmit the detection signals to the torque display 5. The torque display 5 performs comprehensive calculations on the multiple detection signals to obtain the torque value and displays it, ensuring accurate measurement of the frictional torque between the bearing and the shaft, thereby guaranteeing the quality stability of the bearing preload detection.

[0022] The torsion section 32 is fitted with a protective sleeve 6 composed of two joined halves, ensuring that the sleeve 6 is fixedly connected to the flat plate 33. The flat plate 33 is used to connect the protective sleeve 6, which protects the torsion strain gauge 4, preventing damage to the torsion strain gauge 4 from reducing the detection accuracy, ensuring detection reliability, and extending the service life of the detection wrench.

[0023] The torsion handle 2 includes an inner ring 21 coaxially connected to the connecting section 31, and an outer ring 22 connected to the inner ring 21 via a connecting rod. The torque display 5 is mounted on the inner ring 21. The outer ring 22 facilitates hand-held rotation, and the torque display 5 mounted on the inner ring 21 allows the operator to view the test data in real time during the testing process.

[0024] The torque detection shaft 2 and the splined sleeve 1 are integrally formed, simplifying the structure of the detection wrench.

[0025] The technical solutions of the embodiments of this utility model have been fully described above with reference to the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. A wrench for detecting the preload condition of a reducer bearing, characterized in that: It includes a splined sleeve that can be splined with the input shaft of the reducer, a torsion handle, a torque detection shaft coaxially connected between the splined sleeve and the torsion handle, a torsion strain gauge mounted on the torque detection shaft, and a torque display mounted on the torsion handle. The signal wiring of the torsion strain gauge is connected to the torque display. The torque detection shaft torsional as the splined sleeve drives the input shaft of the reducer to rotate.

2. The reducer bearing preload detection wrench according to claim 1, characterized in that: The torque detection shaft includes a connecting section coaxially connected to the torsion handle, a torsion section coaxially connected to the spline sleeve, and a flat plate integrally formed between the connecting section and the torsion section. The diameter of the torsion section is smaller than the diameter of the connecting section, and the diameter of the connecting section is smaller than the diameter of the flat plate. Torque strain gauges are mounted on the torsion section, and the diameter of the torsion section is no greater than one-fifth of the outer diameter of the spline sleeve.

3. The reducer bearing preload detection wrench according to claim 2, characterized in that: The number of torsional strain gauges is multiple, and they are evenly spaced along the circumference of the torsion section.

4. The reducer bearing preload detection wrench according to claim 3, characterized in that: The torsion section is fitted with a protective sleeve made of two joined halves to ensure that the sleeve is fixedly connected to the flat plate.

5. The reducer bearing preload detection wrench according to claim 2, characterized in that: The aforementioned torsion handle includes an inner ring coaxially connected to the connecting section and an outer ring connected to the inner ring via a connecting rod, with a torque display mounted on the inner ring.

6. The reducer bearing preload detection wrench according to claim 1, characterized in that: The torque detection shaft and spline sleeve are integrally formed.

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