Testing device for steering gear of motor vehicle

Abstract

A testing device of a motor vehicle steering gear comprises a left servo actuator supporting seat and a right servo actuator supporting seat, a left servo actuator and a right servo actuator are installed on the left servo actuator supporting seat and the right servo actuator supporting seat respectively, the left servo actuator, the right servo actuator and the steering gear are coaxially arranged, and a left load sensor and a right load sensor are arranged between the left servo actuator and the steering gear and between the right servo actuator and the steering gear. One end of the load sensor is fixedly connected with a piston rod of the servo actuator, and the other end of the load sensor is detachably connected with a steering tie rod of the steering gear; a torque sensor is arranged between a steering control valve of the steering gear and the steering wheel, one end of the torque sensor is detachably connected with an input shaft of the steering control valve of the steering gear, and the other end is fixedly connected with a steering shaft of the steering wheel; the torque sensor is electrically connected with the acquisition equipment; the acquisition equipment is used for acquiring the torque of the input shaft of the steering control valve; and the acquisition equipment is electrically connected with the load sensor and the servo actuator and is used for acquiring the axial load of the steering tie rod and the displacement of a piston rod of the servo actuator.

Description

Technical Field

[0001] The present invention relates to the field of motor vehicle steering systems, and particularly to a test device for motor vehicle steering gears. Background Art

[0002] According to the industry standards in China, namely QC / T529 - 1999 Test Methods for Automotive Hydraulic Power Steering Assist Devices and Power Steering Gear Assemblies on Test Rigs and QC / T29096 - 1992 Test Methods for Automotive Steering Gear Assemblies on Test Rigs, it is necessary to test the transmission efficiency, durability, rack moving force in the steering power cylinder, and angular transmission ratio of motor vehicle steering gears on a dedicated steering gear test bench. However, the existing test devices for motor vehicle steering gears can only conduct single - item tests and cannot use the same test device to perform multiple tests on motor vehicle steering gears.

[0003] For example, CN101975668A discloses a steering gear fatigue test bench, which can not only simulate the horizontal load at the output end, but also simulate the vertical impact load on the output end due to road surface bumps and the driving environment at different temperatures. However, this steering gear fatigue test bench cannot test the transmission efficiency, rack moving force in the steering power cylinder, and angular transmission ratio of motor vehicle steering gears. Summary of the Invention

[0004] The purpose of the present invention is to provide a test device for motor vehicle steering gears to address the corresponding deficiencies in the prior art. This test device can test the transmission efficiency, durability, rack moving force in the steering power cylinder, and angular transmission ratio of motor vehicle steering gears.

[0005] The purpose of the present invention is achieved by the following solution: A test device for motor vehicle steering gears includes left and right servo actuator support seats, on which left and right servo actuators are respectively installed. The left and right servo actuators are coaxially arranged with the steering gear. Left and right load sensors are provided between the left and right servo actuators and the steering gear. One end of the load sensor is fixedly connected to the piston rod of the servo actuator, and the other end is detachably connected to the steering tie rod of the steering gear. A torque sensor is provided between the steering control valve of the steering gear and the steering wheel. One end of the torque sensor is detachably connected to the input shaft of the steering control valve of the steering gear, and the other end is fixedly connected to the steering shaft of the steering wheel. The torque sensor is electrically connected to a collection device, which is used to collect the torque of the input shaft of the steering control valve. The collection device is electrically connected to the load sensor and the servo actuator, and is used to collect the axial load of the steering tie rod and the displacement of the piston rod of the servo actuator.

[0006] Preferably, the steering control valve of the steering gear is connected to the oil circuit of the hydraulic device, and the hydraulic device provides working oil pressure for the steering gear.

[0007] Preferably, a steering angle sensor is provided on the steering shaft of the steering wheel, and the steering angle sensor is electrically connected to the acquisition device for acquiring the rotation angle of the steering wheel.

[0008] Preferably, the input shaft of the steering control valve is detachably connected to the input shaft flange through a clamp, and the input shaft flange is fixedly connected to the torque sensor through bolts.

[0009] Preferably, the free end of the steering tie rod of the steering gear is threadedly connected to the tie rod flange, and the tie rod flange is fixedly connected to the load sensor through bolts.

[0010] Preferably, the hydraulic device includes an oil tank and a steering hydraulic pump.

[0011] Preferably, the piston rods of the left and right servo actuators are respectively supported on the left and right piston rod support seats.

[0012] The beneficial effects of the present invention are as follows: Multifunctional integrated test ability: Rack moving force test ability: By driving the steering tie rod to move axially at a constant speed through the servo actuator and cooperating with the torque sensor to monitor the torque change of the input shaft of the steering control valve in real time, the moving resistance characteristics of the rack in the steering gear can be accurately measured; Transmission efficiency test ability: Forward efficiency test: When the servo actuator drives the tie rod to move, the input shaft torque, tie rod load and piston rod displacement data are synchronously collected to accurately calculate the forward transmission efficiency of the motor vehicle steering gear; Reverse efficiency test: By applying a constant load to the steering wheel and monitoring the load response and displacement change of the tie rod, the accurate calculation of the reverse transmission efficiency is realized; Durability test ability: Forward durability test: Apply a controllable resistance load during the ±180° rotation of the steering wheel to simulate the forward durability performance under actual use conditions; Reverse durability test: Drive the steering tie rod to reciprocate through the servo actuator, and at the same time control the steering wheel to rotate follow-up to realize the durability evaluation of the reverse working condition; Linear angle transmission ratio test ability: By setting a steering angle sensor on the steering shaft and synchronously collecting the displacement data of the servo actuator, the corresponding relationship between the steering wheel angle and the tie rod displacement can be accurately established, so as to calculate the linear angle transmission ratio characteristics of the steering gear; When the steering control valve of the steering gear is connected to the oil circuit of the hydraulic device, the performance of the motor vehicle steering gear under oil pressure can be measured; Through innovative structural design and functional configuration, the present invention realizes the comprehensiveness, accuracy, and efficiency of the performance test of motor vehicle steering gears, providing a reliable test means for the research and development and quality control of steering gears. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a top view of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] As Figures 1 to 2 shown, a test device for a motor vehicle steering gear includes a steering gear support base 1 for fixing the steering gear 2. In this embodiment, the number of support bases 1 is two, and each support base 1 includes two columns. The fixed steering gear 2 is fixed to the top of the columns by a clamp. The test device further includes left and right servo actuator support bases 12, and left and right servo actuators 10 are respectively installed on the left and right servo actuator support bases 12.

[0015] The left and right servo actuators 12 are coaxially arranged with the steering gear 2, and the piston rod 11 of the servo actuator 10 is kept at the same height as the steering gear 2. Left and right load sensors 4 are provided between the left and right servo actuators 12 and the steering gear 2. One end of the load sensor 4 is fixedly connected to the piston rod 11 of the servo actuator 10, and the other end of the load sensor 4 is detachably connected to the steering tie rod 9 of the steering gear 2. The piston rod 11 of the servo actuator 10 is supported on a piston rod support base 18. A displacement sensor for detecting the displacement of the piston rod 11 of the servo actuator 10 is provided inside the servo actuator 10. The piston rod 11 of the servo actuator 10 is fixedly connected to one end of the load sensor 4. A flange is provided at the other end of the load sensor 4, and this flange is fixedly connected to a tie rod flange 17 by bolts. The tie rod flange 17 is threadedly connected to the free end of the steering tie rod 9 of the steering gear 2, and the thread at the free end of the steering tie rod 9 is the external thread of the steering tie rod 9 for connecting the tie rod joint.

[0016] A torque sensor 3 is provided between the steering control valve 6 of the steering gear 2 and the steering wheel 7. One end of the torque sensor 3 is detachably connected to the input shaft of the steering control valve 6 of the steering gear 2, and the other end is fixedly connected to the steering shaft 8 of the steering wheel 7. Flanges are provided at both ends of the torque sensor 3. The input shaft of the steering control valve 6 is detachably connected to an input shaft flange 15 by a clamp 14, and the input shaft flange 15 is connected to the flange at one end of the torque sensor 3 by bolts. The flange at the other end of the torque sensor 3 is fixedly connected to the flange provided at the bottom of the steering shaft 8 of the steering wheel 7 by bolts.

[0017] The acquisition device is electrically connected to the torque sensor 3 and is used for acquiring the torque of the input shaft of the steering control valve 6; the acquisition device is electrically connected to the load sensor 4 and the servo actuator 10 and is used for acquiring the axial load of the steering tie rod 9 and the displacement of the piston rod 11 of the servo actuator 10; a rotation angle sensor 16 is provided on the steering shaft 8 of the steering wheel 7, and the rotation angle sensor 16 is electrically connected to the acquisition device and is used for acquiring the rotation angle of the steering wheel 7.

[0018] The steering tie rod 9 is driven by the servo actuator 10 to move axially at a constant speed, and the torque sensor 3 is used to monitor the torque change of the input shaft of the steering control valve 6 in real time, so that the movement resistance characteristics of the rack in the steering gear can be accurately measured; when the servo actuator 10 drives the steering tie rod 9 to move, the input shaft torque, the tie rod load and the piston rod displacement data are collected synchronously, so that the forward transmission efficiency of the motor vehicle steering gear can be accurately calculated; by applying a constant load to the steering wheel 7 and monitoring the load response and displacement change of the steering tie rod 9, the accurate calculation of the reverse transmission efficiency is realized; a controllable resistance load is applied during the rotation of the steering wheel 7 by ±180°, so as to simulate the forward durability performance under actual use conditions; the servo actuator 10 drives the steering tie rod 9 to reciprocate, and at the same time, the steering wheel 7 is controlled to rotate follow-up, so as to realize the durability evaluation of the reverse working condition.

[0019] The steering control valve 6 of the steering gear 2 is connected to the oil circuit of the hydraulic device, and the hydraulic device provides working oil pressure for the steering gear 2; the hydraulic device includes an oil tank 19 for storing hydraulic oil and a steering hydraulic pump 20 for providing the pressure of the hydraulic oil.

[0020] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Without departing from the spirit of the present invention, any modifications made by those skilled in the art fall within the protection scope of the present invention.

Claims

1. A testing device for a motor vehicle steering gear, comprising left and right servo actuator support seats (12), on which left and right servo actuators (10) are respectively installed, characterized in that: The left and right servo actuators (12) are coaxially arranged with the steering gear (2), and left and right load sensors (4) are provided between the left and right servo actuators (12) and the steering gear (2). One end of the load sensor (4) is fixedly connected to the piston rod (11) of the servo actuator (10), and the other end of the load sensor (4) is detachably connected to the steering tie rod (9) of the steering gear (2); A torque sensor (3) is provided between the steering control valve (6) of the steering gear (2) and the steering wheel (7). One end of the torque sensor (3) is detachably connected to the input shaft of the steering control valve (6) of the steering gear (2), and the other end is fixedly connected to the steering shaft (8) of the steering wheel (7); The torque sensor (3) is electrically connected to a collection device, and the collection device is used to collect the torque of the input shaft of the steering control valve (6); the collection device is electrically connected to the load sensor (4) and the servo actuator (10) for collecting the axial load of the steering tie rod (9) and the displacement of the piston rod (11) of the servo actuator (10).

2. The test device for a motor vehicle steering gear according to claim 1, characterized in that: The steering control valve (6) of the steering gear (2) is connected to the oil circuit of a hydraulic device, and the hydraulic device provides working oil pressure for the steering gear (2).

3. The testing device for a motor vehicle steering gear according to claim 1, characterized in that: A rotation angle sensor (16) is provided on the steering shaft (8) of the steering wheel (7), and the rotation angle sensor (16) is electrically connected to the collection device for collecting the rotation angle of the steering wheel (7).

4. The test device for a motor vehicle steering gear according to claim 1, characterized in that: The input shaft of the steering control valve (6) is detachably connected to the input shaft flange (15) through a clamp (14), and the input shaft flange (15) is fixedly connected to the torque sensor (3) by bolts.

5. The testing device for a motor vehicle steering gear according to claim 1, characterized in that: The free end of the steering tie rod (9) of the steering gear (2) is threadedly connected to the tie rod flange (17), and the tie rod flange (17) is fixedly connected to the load sensor (4) by bolts.

6. The test device for a motor vehicle steering gear according to claim 1, characterized in that: The hydraulic device includes an oil tank (19) and a steering hydraulic pump (20).

7. The test device for a motor vehicle steering gear according to claim 1, characterized in that: The piston rods (11) of the left and right servo actuators (10) are respectively supported on the left and right piston rod support seats (18).

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