Test workbench for electric power steering system

Abstract

The utility model relates to an electric power steering system test workbench, and relates to the steering test field, the electric power steering system test workbench comprises a test bench, the test bench is fixedly provided with two test motors, and the driving shaft end of one test motor is coaxially and detachably connected with one end of a lower steering shaft through a connecting mechanism; a driving shaft of the other testing motor is perpendicular to the table top of the testing table, is arranged upwards and is in transmission connection with a transmission mechanism, and the transmission mechanism is connected with the other end of the lower steering shaft through a connecting mechanism. According to the invention, the influence of resonance on the performance test result of the electric steering system can be reduced, and the performance test precision of the electric steering system is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of steering test technology, and in particular to an electric power steering system test bench. Background Art

[0002] The automotive electric power steering system (EPS) is a mechatronic control system. Compared with the traditional hydraulic power steering system, it does not require a hydraulic pump, hydraulic pipelines, or hydraulic oil. The hydraulic pump of the hydraulic power steering needs to work all the time, while the electric power steering motor only works when steering assistance is needed, saving energy. The electric power steering system can provide assistance according to the vehicle speed, and provide different assistance according to the control strategy, making the driving feel good and the driving operation easy. The electric power steering is widely used and generally accepted by people. During the development and production process, the EPS needs to be tested for product performance and debugged in the product development stage. The test bench mainly realizes some test functions and has a certain adaptability. The most important thing is that when simulating the steering of the real car, the steering damping torque must respond quickly and the control accuracy must be high, so as to test the control accuracy of the steering control system and verify the performance.

[0003] In the prior art, a common test bench for performance testing of an electric power steering system mainly includes a test bench, on which a first fixture is fixedly installed and can be raised and lowered and adjusted by a lifting mechanism. During testing, an operator installs an upper steering shaft of the steering system on the first fixture, and two second fixtures are slidably adjusted on the test bench. Both ends of the lower steering shaft are installed on the test bench through the second fixtures. A first motor for driving the upper steering shaft to rotate is installed on the test bench, and a second motor for driving the lower steering shaft to move left and right is also installed. The two second motors are coaxially arranged on the test bench, and the driving ends of the two second motors are respectively connected to the two ends of the lower steering shaft through a connecting mechanism. During the performance test, the first motor drives the upper steering shaft to rotate, and the two second motors drive the lower steering shaft to move left and right.

[0004] However, during the actual testing process, since the two second motors are coaxially installed, resonance is prone to occur during the test, which affects the accuracy of the performance test results. There is room for improvement. Utility Model Content

[0005] In order to reduce the impact of resonance on the performance test results of an electric steering system and ensure the accuracy of the performance test of the electric steering system, the present application provides an electric power steering system test bench.

[0006] The electric power steering system test bench provided in this application adopts the following technical solution:

[0007] An electric power steering system test bench comprises a test bench, on which two test motors are fixedly mounted, wherein a drive shaft end of one of the test motors is coaxially and detachably connected to one end of a lower steering shaft through a connecting mechanism;

[0008] The driving shaft of the other test motor is perpendicular to the table top of the test bench and is arranged upward, and is transmission-connected with a transmission mechanism, and the transmission mechanism is connected to the other end of the lower steering shaft through a connecting mechanism.

[0009] By adopting the above technical solution, through the mutual coordination and use of the test motor and the transmission mechanism, it is possible to avoid the coaxial installation of the two test motors at the two ends of the lower steering shaft, and to avoid the situation in which the two test motors affect the accuracy of the performance test results due to resonance during the performance test.

[0010] Preferably, a sliding seat is slidably connected to the table top of the test bench, and the connecting mechanism is fixedly mounted on the sliding seat;

[0011] The transmission mechanism includes a mounting arm and a connecting rod. The mounting arm is fixedly mounted on the driving shaft end of the test motor, one end of the connecting rod is rotatably connected to the mounting arm, and one end of the connecting rod away from the mounting arm is rotatably connected to the sliding seat.

[0012] By adopting the above technical solution, during the actual test process, the test motor drives the mounting arm to swing back and forth, and the connecting rod can drive the sliding seat, the connecting mechanism and the end of the lower steering shaft to slide back and forth linearly, thereby avoiding the need for two coaxial test motors to achieve the technical effect of automatically driving the lower steering shaft to slide.

[0013] Preferably, two guide rods are fixedly connected to the sliding seat, and two fixed blocks are fixedly connected to the table top of the test bench. The two fixed blocks are respectively provided with sliding holes for the guide rods to match, and the two guide rods are respectively slidably installed on the two fixed blocks.

[0014] By adopting the above technical solution, the guide rod is arranged so that the sliding seat can always slide back and forth along the axial straight line of the guide rod during the sliding process, thereby limiting the position of the sliding seat.

[0015] Preferably, two slide rails are fixedly connected to the table top of the test bench, two sliders are fixedly connected to the sliding seat, and the bottoms of the two sliders are respectively provided with slide grooves adapted to the slide rails, and the two sliders are respectively slidably installed on the two slide rails.

[0016] By adopting the above technical solution, the slide rail and the slider are used in cooperation with each other, so as to achieve the technical effect of sliding connection between the slide seat and the test bench.

[0017] Preferably, limiting protrusions are respectively formed on the inner side walls opposite to each other of the slide groove, limiting grooves are respectively provided on both sides of the slide rail, and two limiting protrusions are respectively embedded in the two limiting grooves.

[0018] By adopting the above technical solution, the limiting protrusion and the limiting groove are used in combination with each other, which can prevent the sliding seat from falling off the sliding rail during the sliding process, thereby improving the stability of the sliding action of the sliding seat.

[0019] Preferably, a protective bracket is fixedly installed on the test bench, and the protective bracket includes a bottom plate and a top plate. The bottom plate is provided with a through hole for the driving shaft end of the test motor to extend out, and a movable space is formed between the bottom plate and the top plate. The connection between the mounting arm and the driving shaft end of the second motor is located in the movable space.

[0020] By adopting the above technical solution, the connection between the mounting arm and the driving shaft end of the test motor is shielded between the top plate and the bottom plate, which can effectively reduce the adverse effects of external dust, debris, etc. on the movement of the mounting arm.

[0021] In summary, the electric power steering system test bench of the present application includes at least one of the following beneficial technical effects:

[0022] 1. By matching and using the test motor and the transmission mechanism, it is possible to avoid the coaxial installation of two test motors at both ends of the lower steering shaft, and avoid the situation in which the two test motors affect the accuracy of the performance test results due to resonance during the performance test;

[0023] 2. By setting the guide rod, the sliding seat can always slide back and forth along the axial straight line of the guide rod during the sliding process, which can limit the position of the sliding seat;

[0024] 3. The connection between the mounting arm and the driving shaft end of the test motor is shielded between the top plate and the bottom plate, which can effectively reduce the adverse effects of external dust, debris, etc. on the movement of the mounting arm. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of an embodiment of the present application for illustrating the overall structure of a test workbench.

[0026] Figure 2 It is a schematic diagram of an embodiment of the present application for illustrating the overall structure of a transmission mechanism.

[0027] Explanation of the accompanying drawings: 1. test bench; 11. fixed block; 12. slide rail; 2. test motor; 3. connecting mechanism; 4. transmission mechanism; 41. mounting arm; 42. connecting rod; 5. sliding seat; 51. guide rod; 52. slider; 6. protective bracket; 61. bottom plate; 62. top plate; 63. activity space. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-2 This application is described in further detail.

[0029] Example

[0030] The present application embodiment discloses an electric power steering system test bench. Figure 1 , which mainly includes a test bench 1. Two test motors 2 are fixedly installed on the test bench 1, wherein a driving shaft end of one test motor 2 is coaxially detachably connected to one end of a lower steering shaft through a connecting mechanism 3; a driving shaft of the other test motor 2 is perpendicular to the table surface of the test bench 1 and is arranged upward, and is transmission-connected to a transmission mechanism 4, and the transmission mechanism 4 is connected to the other end of the lower steering shaft through the connecting mechanism 3.

[0031] By matching and using the test motor 2 and the transmission mechanism 4, it is possible to avoid the first motor and the second motor being coaxially installed at both ends of the lower steering shaft, and to avoid the situation where the two test motors 2 affect the accuracy of the performance test results due to resonance.

[0032] Reference Figure 1 and Figure 2 A sliding seat 5 is slidably connected to the table top of the test bench 1, and the connecting mechanism 3 is fixedly installed on the sliding seat 5; the transmission mechanism 4 includes a mounting arm 41 and a connecting rod 42, the mounting arm 41 is fixedly installed on the driving shaft end of the test motor 2, one end of the connecting rod 42 is rotatably connected to the mounting arm 41, and the end of the connecting rod 42 away from the mounting arm 41 is rotatably connected to the sliding seat 5.

[0033] During the actual testing process, the test motor 2 drives the mounting arm 41 to swing back and forth, and can drive the sliding seat 5, the connecting mechanism 3 and the end of the lower steering shaft to slide back and forth linearly through the connecting rod 42, thereby achieving the technical effect of automatically driving the lower steering shaft to slide without the need for two test motors 2.

[0034] Reference Figure 2 Two guide rods 51 are fixedly connected to the sliding seat 5, and two fixed blocks 11 are fixedly connected to the table top of the test bench 1. The two fixed blocks 11 are respectively provided with sliding holes for the guide rods 51 to match, and the two guide rods 51 are respectively slidably installed on the two fixed blocks 11.

[0035] By setting the guide rod 51 , the sliding seat 5 can always slide back and forth along the axial straight line of the guide rod 51 during the sliding process, so that the position of the sliding seat 5 can be limited.

[0036] Reference Figure 1 and Figure 2 Two slide rails 12 are fixedly connected to the table top of the test bench 1, and two sliders 52 are fixedly connected to the sliding seat 5. The bottoms of the two sliders 52 are respectively provided with slide grooves adapted to the slide rails 12, and the two sliders 52 are respectively slidably installed on the two slide rails 12.

[0037] The slide rail 12 and the slider 52 cooperate with each other to achieve the technical effect of sliding connection between the slide seat 5 and the test bench 1.

[0038] In the embodiment of the present application, limiting protrusions are respectively formed on the inner side walls opposite to each other of the slide groove, limiting grooves are respectively provided on both sides of the slide rail 12, and two limiting protrusions are respectively embedded in the two limiting grooves.

[0039] The limiting protrusion and the limiting groove are used in combination with each other to prevent the sliding seat 5 from falling off the sliding rail 12 during the sliding process, thereby improving the stability of the sliding action of the sliding seat 5.

[0040] Reference Figure 2 A protective bracket 6 is fixedly installed on the test bench 1. The protective bracket 6 includes a bottom plate 61 and a top plate 62. The bottom plate 61 is provided with a through hole for the driving shaft end of the second motor to extend out. An activity space 63 is formed between the bottom plate 61 and the top plate 62. The connection between the mounting arm 41 and the driving shaft end of the second motor is located in the activity space 63.

[0041] The connection between the mounting arm 41 and the driving shaft end of the test motor 2 is shielded between the top plate 62 and the bottom plate 61 , which can effectively reduce the adverse effects of external dust, debris, etc. on the movement of the mounting arm 41 .

[0042] It should be noted that in the embodiment of the present application, the transmission mechanism 4 is only installed on one test motor 2 to avoid the two test motors 2 coaxially driving the lower steering shaft. In some other embodiments, two transmission mechanisms 4 can be used to connect the test motor 2 and the end of the lower steering shaft according to actual needs, which is not limited here.

[0043] The implementation principle of an electric power steering system test workbench in an embodiment of the present application is: by matching and using the test motor 2 and the transmission mechanism 4, it is possible to avoid the two test motors 2 being coaxially installed at both ends of the lower steering shaft, and to avoid the situation where the two test motors 2 affect the accuracy of the performance test results due to resonance.

[0044] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An electric power steering system test bench, characterized in that: The test bench (1) comprises two test motors (2) fixedly mounted on the test bench (1), wherein a drive shaft end of one of the test motors (2) is coaxially and detachably connected to one end of a lower steering shaft via a connecting mechanism (3); The driving shaft of the other test motor (2) is perpendicular to the table surface of the test bench (1) and is arranged upwards, and is transmission-connected to a transmission mechanism (4), and the transmission mechanism (4) is connected to the other end of the lower steering shaft via a connection mechanism (3).

2. The electric power steering system test bench according to claim 1, characterized in that: A sliding seat (5) is slidably connected to the table surface of the test bench (1), and the connecting mechanism (3) is fixedly mounted on the sliding seat (5); The transmission mechanism (4) comprises a mounting arm (41) and a connecting rod (42); the mounting arm (41) is fixedly mounted on the driving shaft end of the test motor (2); one end of the connecting rod (42) is rotatably connected to the mounting arm (41); and one end of the connecting rod (42) away from the mounting arm (41) is rotatably connected to the sliding seat (5).

3. The electric power steering system test bench according to claim 2, characterized in that: Two guide rods (51) are fixedly connected to the sliding seat (5), and two fixed blocks (11) are fixedly connected to the table top of the test bench (1). The two fixed blocks (11) are respectively provided with sliding holes for the guide rods (51) to match, and the two guide rods (51) are respectively slidably mounted on the two fixed blocks (11).

4. The electric power steering system test bench according to claim 3, characterized in that: Two slide rails (12) are fixedly connected to the table top of the test bench (1), and two sliders (52) are fixedly connected to the sliding seat (5). The bottoms of the two sliders (52) are respectively provided with slide grooves adapted to the slide rails (12), and the two sliders (52) are respectively slidably mounted on the two slide rails (12).

5. The electric power steering system test bench according to claim 4, characterized in that: Limiting protrusions are respectively formed on the inner side walls opposite to each other of the slide grooves, and limiting grooves are respectively provided on both sides of the slide rail (12), and the two limiting protrusions are respectively embedded in the two limiting grooves.

6. The electric power steering system test bench according to claim 2, characterized in that: A protective bracket (6) is fixedly mounted on the test bench (1), and the protective bracket (6) comprises a bottom plate (61) and a top plate (62). The bottom plate (61) is provided with a through hole for the driving shaft end of the test motor (2) to extend out, and an activity space (63) is formed between the bottom plate (61) and the top plate (62). The connection between the mounting arm (41) and the driving shaft end of the test motor (2) is located in the activity space (63).

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