Hub bearing unit testing machine for both commercial vehicle and passenger vehicle

Abstract

The invention relates to the technical field of hub bearing testing, and discloses a hub bearing unit testing machine for both commercial vehicles and passenger vehicles, which comprises a main shaft, a driving part, loading arms and two groups of bearing parts, the loading arms are arranged at the upper end of a test bed, the main shaft is arranged between the loading arms, the two groups of bearing parts are symmetrically arranged at two ends of the main shaft, and the driving part is arranged on the outer wall of the main shaft. The bearing part comprises a locking nut, a bearing and a bearing seat, the bearing seat is arranged at the upper end of the test bed, the bearing is arranged in the bearing seat, end covers are arranged at the two ends of the bearing seat, the locking nut is arranged at one end of the main shaft, the clearance of the bearing part can be adjusted by rotating the locking nut, a channel is communicated between the main shaft and a bearing inner ring, and the channel can convey high-pressure oil into the bearing inner ring; according to the scheme, high-pressure oil is conveyed to the bearing inner ring through the channel, so that the bearing inner ring is expanded, a gap is formed between the bearing inner ring and the outer wall of the main shaft, a worker can conveniently rotate the locking nut to unlock or tighten, and the clearance of the bearing piece is increased or decreased.

Description

Technical Field

[0001] The present invention relates to the technical field of wheel hub bearing testing, and in particular to a wheel hub bearing unit testing machine suitable for both commercial vehicles and passenger vehicles. Background Art

[0002] Currently, wheel hub bearing unit test benches generally face technical bottlenecks that hinder compatibility with the testing requirements of commercial vehicles and passenger vehicles. Specifically, passenger vehicle wheel hub bearing testing has the following characteristics: a narrow loading force range (typically 5-50kN), high speed requirements (up to 1500 rpm), and stringent force loading accuracy requirements (error must be controlled within ±2%). To meet these technical requirements, passenger vehicle test benches typically use smaller spindle bearings with a smaller bearing clearance (generally in the range of 50-200μm) to ensure excellent operating stability and dynamic response characteristics of the spindle system. However, this design results in limited load-bearing capacity, making it difficult to meet the high load (typically 50-200kN) testing requirements of commercial vehicles.

[0003] In contrast, commercial vehicle wheel hub bearing test benches exhibit different technical characteristics: they require higher loading forces, relatively low speeds (generally no more than 1000 rpm), and relatively loose force loading accuracy requirements (error control within ±3%). To this end, commercial vehicle test benches require larger spindle bearings and greater bearing clearance (typically in the 200-300μm range) to enhance the system's load-bearing capacity. However, this design sacrifices spindle rotational accuracy and dynamic stability, resulting in the system being unable to meet the high-speed operation and high-precision loading requirements required for passenger vehicle testing.

[0004] Since existing test benches are difficult to test both commercial vehicles and passenger cars, this not only increases equipment investment costs but also restricts the improvement of test efficiency. Therefore, we propose a wheel hub bearing unit testing machine that can be used for both commercial vehicles and passenger cars to solve the above problems. Summary of the Invention

[0005] The present invention aims to provide a wheel hub bearing unit testing machine that can test both commercial vehicles and passenger cars, so as to solve the problem that existing test benches are difficult to achieve the purpose of testing both commercial vehicles and passenger cars.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical solution: a wheel hub bearing unit testing machine for both commercial vehicles and passenger vehicles, comprising a main shaft, a driving member, a loading arm and two groups of bearing members, the loading arm being arranged at the upper end of the test bench, the main shaft being rotatably installed between the loading arms, the two groups of bearing members being symmetrically arranged at the outer walls at both ends of the main shaft, the driving member being arranged on the outer wall of the main shaft, the driving member being able to drive the main shaft to rotate, the bearing member comprising a locking nut, a bearing and a bearing seat, the bearing seat being arranged at the upper end of the test bench, the bearing being rotatably arranged in the bearing seat, end covers being provided at both ends of the bearing seat to form a closed space in the bearing seat, the locking nut being arranged on the outer wall of one end of the main shaft close to the loading arm, and the clearance of the bearing member being adjusted by rotating the locking nut, a channel being connected between the main shaft and the inner ring of the bearing, the channel being able to transport high-pressure oil to the inner ring of the bearing.

[0007] The beneficial effects of this solution are as follows: since commercial vehicles require a larger clearance to adapt to heavy load or high impact working conditions, while passenger cars require a smaller clearance to meet the requirements of high precision and stability, in this solution, the clearance of the bearing parts is adjusted by turning the locking nut, so that commercial vehicles and passenger cars can be inspected without replacing the spindle bearings. High-pressure oil is delivered to the inner ring of the bearing through the channel, so that the inner ring of the bearing expands, thereby creating a gap between the inner ring of the bearing and the outer wall of the spindle, which is convenient for the staff to turn the locking nut to unlock or tighten it, so that the clearance of the bearing parts can be increased or decreased. At the same time, the high-pressure oil can also form a high-pressure oil film on the inner ring of the bearing to fine-tune the clearance, and more precise clearance control can be achieved in conjunction with the locking nut.

[0008] Preferably, as an improvement, a connecting part is provided between the main shaft and the loading arm, the connecting part includes a connecting shaft and a main shaft flange, the main shaft flange is provided at one end of the main shaft close to the loading arm, a hub bearing is provided at the end of the main shaft flange close to the loading arm, the connecting shaft is provided on the inner wall of the hub bearing, and the connecting shaft can be fixedly connected to the loading arm.

[0009] The beneficial effects are as follows: by setting the connecting piece, the loading arm can transfer the load to the wheel hub bearing more accurately. When the loading arm applies a radial load or an axial load, by adjusting the gap of the connecting piece, the load on the wheel hub bearing is made to be more consistent with the actual simulated vehicle driving conditions, thereby improving the loading accuracy and ensuring that the test results can truly reflect the performance of the wheel hub bearing in actual use.

[0010] Preferably, as an improvement, a bearing retaining ring is provided at one end of the bearing cover close to the locking nut, and the bearing retaining ring is located on the outer wall of the main shaft.

[0011] The beneficial effects are as follows: the bearing retaining ring can effectively limit the axial displacement of the bearing component on the outer wall of the main shaft, forming a dual fixation with the locking nut. The bearing retaining ring cooperates with the bearing cover to reduce the risk of impurities such as dust and debris entering the bearing interior, reducing bearing wear and failure caused by contamination. Especially in long-term continuous operation test scenarios, it can effectively extend the service life of the bearing, reduce the number of equipment downtime maintenance, and ensure the continuity and efficiency of the test. When the bearing clearance is adjusted using the locking nut, the bearing retaining ring can provide a stable support surface, so that the locking force acts more evenly on the outer wall of the bearing component, avoiding deformation caused by uneven force during the clearance adjustment process, and ensuring the accuracy and consistency of the clearance adjustment.

[0012] Preferably, as an improvement, the driving member includes a driving motor, a driving pulley and a driven pulley, the driving motor is arranged at the upper end of the test bench, the driving pulley is arranged at the output shaft of the driving motor, the driven pulley is arranged at the outer wall of the main shaft, and the outer walls of the driving pulley and the driven pulley are jointly provided with a belt.

[0013] Preferably, as an improvement, a lubricating oil pump is provided at the upper end of the test bench, an oil inlet pipe is connected between the bearing seat and the lubricating oil pump, and an oil outlet pipe is connected between the end cover and the lubricating oil pump.

[0014] The beneficial effects are: the lubricating oil pump continuously delivers lubricating oil to the inside of the bearing seat through the oil inlet pipe, thereby forming a stable oil film on the friction surface between the bearing raceway and the rolling element. When the testing machine simulates the heavy-load and high-load working conditions of commercial vehicles, or the high-frequency and precise operation conditions of passenger cars, continuous lubrication can effectively reduce the friction coefficient of the bearing, reduce wear, and avoid problems such as bearing overheating and seizure caused by dry friction, ensuring that the main shaft maintains stable operation during high-speed rotation, and improving the reliability and continuity of the test.

[0015] Preferably, as an improvement, a vibration sensor is provided on the outer wall of the bearing seat.

[0016] The beneficial effect is: when the test machine simulates the heavy-load and high-load working conditions of commercial vehicles, or the high-frequency and precise operation conditions of passenger cars, when the collected value of the vibration sensor is too large, high-pressure oil can be supplied to the inner ring of the bearing through the channel, so that the inner ring of the bearing expands, and then a gap is created between the inner ring and the outer wall of the main shaft, which is beneficial for the staff to adjust the locking nut to change the clearance of the bearing parts, so as to increase the stability of the equipment operation and improve the loading accuracy.

[0017] Preferably, as an improvement, a temperature sensor is provided on the outer wall of the bearing seat.

[0018] The beneficial effect is: when the temperature sensor detects that the temperature of the bearing is too high, the staff can increase the oil output of the lubricating oil pump to take away more heat, so that the temperature of the bearing is maintained within an appropriate range, avoiding problems such as bearing overheating and jamming caused by dry friction, ensuring that the main shaft maintains stable operation during high-speed rotation, and improving the reliability and continuity of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the front cross-sectional structure of the wheel hub bearing unit testing machine according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The following is further described in detail through specific implementation methods: The reference numerals in the drawings of the specification include: main shaft 1, loading arm 2, locking nut 3, bearing 4, bearing seat 5, end cover 6, channel 7, connecting shaft 8, main shaft flange 9, hub bearing 10, bearing retaining ring 11, drive motor 12, driving pulley 13, driven pulley 14, belt 15, lubricating oil pump 16, oil inlet pipe 17, oil outlet pipe 18, vibration sensor 19, temperature sensor 20.

[0021] Example The embodiment is basically as shown in the attached Figure 1 As shown, Figure 1The wheel hub bearing unit testing machine shown in the figure is suitable for both commercial vehicles and passenger vehicles, including a main shaft 1, a driving member, a loading arm 2 and two sets of bearing members. The loading arm 2 is arranged at the upper end of the test bench, and the main shaft 1 is rotatably installed between the loading arms 2. Connecting members are provided between the left and right ends of the main shaft 1 and the loading arms 2. The connecting members include a connecting shaft 8 and a main shaft flange 9. In this embodiment, the connecting member at the left end is taken as an example. The main shaft flange 9 is threadedly connected to the left end of the main shaft 1. The left end of the main shaft flange 9 is fixedly installed with a wheel hub bearing 10 by bolts. The connecting shaft 8 is clamped to the inner wall of the wheel hub bearing 10, and the left end of the connecting shaft 8 is fixedly connected to the inner wall of the loading arm 2 by bolts. The driving member is arranged on the outer wall of the main shaft 1, and the driving member can drive the main shaft 1 to rotate. The driving member includes a driving motor 12, a driving pulley 13 and a driven pulley 14. A support plate (not shown in the figure) is fixedly installed on the rear side of the upper end of the test bench. The driving motor 12 is fixedly installed on the front end of the support plate. The driving pulley 13 is fixedly installed on the output shaft of the driving motor 12. The driven pulley 14 is fixedly installed on the outer wall of the middle part of the main shaft 1. The outer walls of the driving pulley 13 and the driven pulley 14 are jointly tensioned with a belt 15. Two sets of bearing members are symmetrically arranged on the outer walls of the left and right ends of the main shaft 1. In this embodiment, the bearing member at the left end is taken as an example. The bearing member includes a locking nut 3 , bearing 4 and bearing seat 5, the bearing seat 5 is fixedly mounted on the upper end of the test bench, the bearing 4 is rotatably mounted in the bearing seat 5, and the bearing 4 is sleeved on the outer wall of the main shaft 1, and the left and right ends of the bearing seat 5 are fixedly mounted with end covers 6 to form a closed space in the bearing seat 5, the locking nut 3 is threadedly connected to the outer wall of the left end of the main shaft 1, and the clearance of the bearing 4 can be adjusted by rotating the locking nut 3. The two ends of the main shaft 1 are frustum-shaped, and the clearance of the bearing 4 is controlled by changing the position of the bearing part on the outer wall of the main shaft 1. A channel 7 is connected between the main shaft 1 and the inner ring of the bearing 4. The channel 7 is set to L-shaped, and the upper end of the channel 7 extends to the outer wall of the inner ring of the bearing 4, the loading arm 2, The hub bearing 10 and the middle part of the main shaft flange 9 are both provided with through holes coaxial with the channel 7. When the testing machine is not working, the channel 7 is connected to the connecting pipe of the hydraulic pump through the through hole. The hydraulic pump delivers high-pressure oil to the inner ring of the bearing 4 through the channel 7, thereby causing the inner ring of the bearing 4 to expand, and thus a gap is generated between the inner ring and the outer wall of the main shaft 1. This is beneficial for the staff to adjust the locking nut 3 to change the clearance of the bearing parts, so as to increase the stability of the equipment operation and improve the loading accuracy. When the testing machine is working, the connecting pipe of the hydraulic pump is disconnected from the channel 7, and a bearing retaining ring 11 is clamped in the middle of the left end of the bearing 4 cover, and the bearing retaining ring 11 is located on the outer wall of the main shaft 1.

[0022] A vibration sensor 19 is fixedly installed on the outer wall of the upper end of the bearing seat 5 on the right side. The vibration sensor 19 can detect the vibration amplitude of the testing machine. A temperature sensor 20 is fixedly installed on the outer wall of the upper end of the bearing seat 5 on the left side. The temperature sensor 20 can detect the temperature of the bearing 4 when it is working. A lubricating oil pump 16 is fixedly installed on the upper end of the test bench. The lower ends of the bearing seats 5 on the left and right sides are connected to the lubricating oil pump 16 with oil inlet pipes 17. The end covers 6 on the left and right ends of the lubricating oil pump 16 are connected to the lubricating oil pump 16 with oil outlet pipes 18. The lubricating oil pump 16 transports lubricating oil to the bearing seat 5 through the oil inlet pipe 17, thereby forming a stable oil film on the friction surface between the raceway and the rolling element of the bearing 4, avoiding overheating, jamming and other problems of the bearing 4 caused by dry friction, ensuring that the main shaft 1 maintains stable operation during high-speed rotation, improving the reliability and continuity of the test, and then the excess lubricating oil is recovered and cooled through the oil outlet pipe 18.

[0023] The specific implementation process is as follows: When inspecting the wheel hub bearing 10, the staff first threadedly connects the two main shaft flanges 9 to the two ends of the main shaft 1, and then fixes the wheel hub bearing 10 to the main shaft flange 9 with bolts. Then the staff docks the connecting shaft 8 with the wheel hub bearing 10. After installing the connecting parts and the main shaft 1, the staff connects the hydraulic pump to the channel 7, and supplies high-pressure oil to the inner ring of the bearing 4, so that the inner ring of the bearing 4 expands, thereby creating a gap with the outer wall of the main shaft 1, which is conducive to the staff adjusting the locking nut 3 to change the clearance of the bearing parts. After determining the clearance of the bearing 4, the staff connects the connecting shaft 8 to the loading arm 2, and then connects the lubricating oil station to the bearing The parts are connected to each other, thereby lubricating and cooling the bearing parts. Finally, the main shaft 1 is driven to rotate by the driving part to test the wheel hub bearing 10. In this solution, the clearance of the bearing parts is adjusted by rotating the locking nut 3, so that commercial vehicles and passenger cars can be tested without replacing the main shaft 1. High-pressure oil is delivered to the inner ring of the bearing 4 through the channel 7, so that the inner ring of the bearing 4 expands, and a gap is generated between it and the outer wall of the main shaft 1, which is convenient for the staff to rotate the locking nut 3 to unlock or tighten it, so that the clearance of the bearing parts can be increased or decreased. At the same time, the high-pressure oil can also form a high-pressure oil film on the inner ring of the bearing 4 to fine-tune the clearance. In combination with the locking nut 3, more precise clearance control can be achieved.

[0024] The above is only an embodiment of the present invention, and the common knowledge such as the specific technical solutions and / or characteristics in the solution are not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the description can be used to interpret the content of the claims.

Claims

1. A wheel hub bearing unit testing machine for both commercial vehicles and passenger vehicles, characterized by: It includes a main shaft, a driving part, a loading arm and two groups of bearing parts. The loading arm is arranged at the upper end of the test bench. The main shaft is rotatably installed between the loading arms. The two groups of bearing parts are symmetrically arranged on the outer walls of both ends of the main shaft. The driving part is arranged on the outer wall of the main shaft. The driving part can drive the main shaft to rotate. The bearing part includes a locking nut, a bearing and a bearing seat. The bearing seat is arranged at the upper end of the test bench. The bearing is rotatably arranged in the bearing seat. End covers are provided at both ends of the bearing seat to form a closed space in the bearing seat. The locking nut is arranged on the outer wall of one end of the main shaft close to the loading arm, and the clearance of the bearing part can be adjusted by rotating the locking nut. There is a channel between the main shaft and the inner ring of the bearing, and the channel can transport high-pressure oil to the inner ring of the bearing.

2. The wheel hub bearing unit testing machine for both commercial vehicles and passenger vehicles according to claim 1, characterized in that: A connecting part is provided between the main shaft and the loading arm, and the connecting part includes a connecting shaft and a main shaft flange. The main shaft flange is provided at one end of the main shaft close to the loading arm. A hub bearing is provided at the end of the main shaft flange close to the loading arm. The connecting shaft is provided on the inner wall of the hub bearing, and the connecting shaft can be fixedly connected to the loading arm.

3. The wheel hub bearing unit testing machine for both commercial vehicles and passenger vehicles according to claim 2, characterized in that: A bearing retaining ring is provided at one end of the bearing cover close to the locking nut, and the bearing retaining ring is located on the outer wall of the main shaft.

4. The wheel hub bearing unit testing machine for both commercial vehicles and passenger vehicles according to claim 3, characterized in that: The driving part includes a driving motor, a driving pulley and a driven pulley. The driving motor is arranged at the upper end of the test bench, the driving pulley is arranged at the output shaft of the driving motor, and the driven pulley is arranged at the outer wall of the main shaft. The outer walls of the driving pulley and the driven pulley are jointly provided with a belt.

5. The wheel hub bearing unit testing machine for both commercial vehicles and passenger vehicles according to claim 4, characterized in that: A lubricating oil pump is provided at the upper end of the test bench. An oil inlet pipe is connected between the bearing seat and the lubricating oil pump, and an oil outlet pipe is connected between the end cover and the lubricating oil pump.

6. The wheel hub bearing unit testing machine for both commercial vehicles and passenger vehicles according to claim 5, characterized in that: A vibration sensor is provided on the outer wall of the bearing seat.

7. The wheel hub bearing unit testing machine for both commercial vehicles and passenger vehicles according to claim 6, characterized in that: A temperature sensor is provided on the outer wall of the bearing seat.

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