Test bench for testing electro-hydraulic power-assisted steering gear

Abstract

The utility model discloses a test bench for testing an electro-hydraulic power-assisted steering gear. The test bench comprises an input end driving and measuring system, an output end loading and measuring system, an oil supply and power system and an electrical and control system. The input end driving and measuring system comprises a servo motor, a first angle gauge, a torque sensor and a universal joint which are connected in sequence; the universal joint is connected with an input shaft of the electro-hydraulic steering gear through the input clamp; the output end loading and measuring system comprises a torque sensor, a bearing seat and a loading shaft which are connected in sequence; the loading shaft is connected with an output shaft of the electro-hydraulic steering gear; a loading swing arm is fixed on the bearing seat, and a force arm of the loading swing arm is sequentially connected with a connection adjusting mechanism and a servo oil cylinder; the oil supply and power system comprises an oil supply pump station and a power pump; the oil supply pump station provides an oil source for the electro-hydraulic steering gear; the power pump provides oil pressure power for the servo oil cylinder; and the electrical and control system is electrically connected with the input end driving and measuring system, the output end loading and measuring system and the oil supply and power system respectively.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobile performance testing and relates to an electro-hydraulic power steering gear testing bench. Background Art

[0002] The automobile steering system is a very important system for automobile safety, and the steering gear is the most important core component of the steering system. The traditional hydraulic power steering (HPS) relies on the engine-driven hydraulic pump to provide power. The power is constant and cannot be adjusted according to the driver's needs and driving conditions. Therefore, HPS has certain limitations in fuel economy and driving experience. With the development of vehicle intelligence and steering technology, electric hydraulic power steering (EHPS) has gradually become the mainstream. EHPS uses an electric motor to drive the hydraulic pump, thereby realizing dynamic adjustment of the power. This adjustment can be precisely controlled according to factors such as the driver's steering torque, vehicle speed and driving conditions, providing a more comfortable and safe driving experience.

[0003] With the development of vehicle intelligence and steering technology, traditional hydraulic power steering (HPS) is gradually developing towards electric hydraulic power steering (EHPS). At present, commercial vehicle steering products are mainly pure hydraulic steering, and the corresponding steering test benches have relatively simple functions. Facing new electro-hydraulic power steering products, the traditional steering test bench has limited testing capabilities and is difficult to fully simulate actual vehicle conditions. At the same time, the test bench also has problems such as slow response speed, high noise in the hydraulic system, and unstable control of the output loading end. The work efficiency is low, and it is difficult to achieve accurate detection of the steering. Utility Model Content

[0004] The purpose of the utility model is to solve the technical problems in the prior art that the testing capability of the traditional steering gear test bench for the electro-hydraulic power steering gear is limited, it is difficult to fully simulate the actual vehicle conditions, and it is difficult to accurately detect the steering gear, and to provide an electro-hydraulic power steering gear test bench.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides an electro-hydraulic power steering gear test bench, comprising:

[0007] An input end drive and measurement system, the input end drive and measurement system comprising a servo motor, a first angle meter, a first torque sensor and a universal joint connected in sequence; the universal joint is connected to the input shaft of the electro-hydraulic steering gear through an input fixture;

[0008] The output end loading and measuring system comprises a second torque sensor, a bearing seat and a loading shaft connected in sequence; the loading shaft is connected to the output shaft of the electro-hydraulic steering gear; a loading swing arm is fixed on the bearing seat, and the force arm of the loading swing arm is connected to the connection adjustment mechanism and the servo cylinder in sequence;

[0009] The oil supply and power system includes an oil supply pump station and a power pump; the oil supply pump station is used to provide an oil source for the electro-hydraulic steering gear; the power pump is used to provide hydraulic power for the servo cylinder;

[0010] An electrical and control system, wherein the electrical and control system is electrically connected to an input end driving and measuring system, an output end loading and measuring system, and an oil supply and power system.

[0011] Furthermore, a reducer and a torque limiter are sequentially arranged between the servo motor and the first inclinometer.

[0012] Furthermore, the input end driving and measuring system also includes a second inclinometer; the second inclinometer is connected to the input rocker arm of the electro-hydraulic steering gear.

[0013] Furthermore, the second torque sensor is also connected to an angle encoder; and a tension and pressure sensor is also provided between the connection adjustment mechanism and the servo cylinder.

[0014] Furthermore, the loading shaft and the output shaft of the electro-hydraulic steering gear are connected via a spline sleeve.

[0015] Furthermore, the oil supply pump station and the power pump are both connected to an external circulating water cooling system.

[0016] Furthermore, pressure gauges are provided at both the outlet pipe and the inlet pipe of the external circulating water cooling system.

[0017] Furthermore, the oil supply pump station and the power pump are both arranged in a soundproof cover.

[0018] Furthermore, the oil supply and power system also includes a flow meter and a pressure sensor; the flow meter and pressure sensor are arranged on the pipeline between the electro-hydraulic steering gear and the oil supply pump station, and the flow meter and pressure sensor are also arranged on the pipeline between the power pump and the servo cylinder.

[0019] Furthermore, the electrical and control system includes an industrial computer and a data acquisition unit connected in sequence; the data acquisition unit is electrically connected to the servo motor, the reducer, the torque limiter, the first angle meter, the first torque sensor, the second angle meter, the second torque sensor, the angle encoder, the tension and pressure sensor, the oil supply pump station, the power pump and the electro-hydraulic steering gear.

[0020] Compared with the prior art, the utility model has the following beneficial effects:

[0021] The utility model discloses an electro-hydraulic power steering gear test bench, wherein the bench input end is driven and controlled by a servo motor, and the input shaft speed is set according to the test requirements; the electro-hydraulic steering gear is connected to an oil supply pump station; the output shaft of the electro-hydraulic steering gear is connected to an output end loading and measuring system, and the servo oil cylinder used at the loading end is connected to a power pump, and the loading torque value can be set according to different test requirements; when the output end is in a no-load condition, the output shaft of the electro-hydraulic steering gear can be directly disconnected from the output end loading and measuring system of the test bench; by providing an installation method similar to the original vehicle, including the hydraulic system and electromechanical transmission device necessary for simulating actual working conditions such as road resistance and steering wheel, the actual vehicle condition is fully simulated, the work efficiency is improved, and the accurate detection of the steering gear is achieved.

[0022] Furthermore, the input end drive and measurement system of the utility model is also provided with a reducer and a second inclinometer, which can reduce the rotation speed and increase the torque; the second inclinometer can realize direct and accurate measurement of small angles, and is used for tests with high requirements for angle measurement accuracy, such as free gap measurement.

[0023] Furthermore, the input end drive and measurement system of the utility model is also provided with a torque limiter. When the required torque exceeds the set value due to overload or mechanical failure, a signal will be output to stop the motor and reducer. When the overload condition disappears, the connection will be restored automatically to prevent mechanical damage.

[0024] Furthermore, the output end loading and measuring system of the utility model adopts a spline sleeve to cooperate with the output shaft of the electro-hydraulic steering gear and can be replaced according to different product interfaces;

[0025] Furthermore, the oil supply pump station and the power pump of the utility model are both connected to an external circulating water cooling system to ensure that the oil works stably within the temperature range required by the test;

[0026] Furthermore, the oil supply pump and the power pump of the utility model are placed in a soundproof cover as a whole, which can effectively control the noise of the hydraulic station. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0029] Among them: 1-electro-hydraulic steering gear; 2-input end drive and measurement system; 3-output end loading and measurement system; 4-electrical and control system; 5-oil supply and power system; 6-input shaft; 7-output shaft; 8-bench base; 21-servo motor; 22-reducer; 23-torque limiter; 24-first angle meter; 25-first torque sensor; 26-universal joint; 27-second angle meter; 31-spline sleeve; 32-loading swing arm; 33-loading shaft; 34-bearing seat; 35-second torque sensor; 36-angle encoder; 37-connection adjustment mechanism; 38-tension and pressure sensor; 39-servo cylinder; 41-data acquisition unit; 42-industrial computer; 43-printer; 44-display; 45-keyboard; 51-oil supply pump station; 52-power pump; 53-external circulating water cooling system; 54-soundproof cover; 55-pressure gauge; 56-flow meter; 57-pressure sensor. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] In the description of the embodiments of the present utility model, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use, it is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0034] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0035] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] The utility model is further described in detail below with reference to the accompanying drawings:

[0037] See also Figure 1 The utility model discloses an electro-hydraulic power steering gear test bench, comprising an input end drive and measurement system 2, an output end loading and measurement system 3, an oil supply and power system 5 and an electrical and control system 4. The input end drive and measurement system 2 comprises a servo motor 21, a first angle meter 24, a first torque sensor 25 and a universal joint 26 connected in sequence; the universal joint 26 is connected to the input shaft 6 of the electro-hydraulic steering gear 1 through an input fixture, and is made according to different steering gear input shaft spline sizes. The first torque sensor 25 and the first angle meter 24 are used to measure input torque and rotation angle. The output end loading and measuring system 3 includes a second torque sensor 35, a bearing seat 34 and a loading shaft 33 connected in sequence; the loading shaft 33 is connected to the output shaft 7 of the electro-hydraulic steering gear 1; a loading swing arm 32 is fixed on the bearing seat 34, and the length of the swing arm can be adjusted to achieve the expansion of the loading torque range. The force arm of the loading swing arm 32 is connected to the connection adjustment mechanism 37 and the servo cylinder 39 in sequence, and the servo cylinder 39 can realize the rotation drive and loading of the output end of the steering gear. The oil supply and power system 5 includes an oil supply pump station 51 and a power pump 52; the oil supply pump station 51 is used to provide an oil source for the electro-hydraulic steering gear 1; the power pump 52 is used to provide hydraulic power for the servo cylinder 39. The electrical and control system 4 is electrically connected to the input end driving and measuring system 2, the output end loading and measuring system 3 and the oil supply and power system 5 respectively.

[0038] In a feasible implementation of the utility model, a reducer 22 and a torque limiter 23 are arranged in sequence between the servo motor 21 and the first angle meter 24. When the required torque exceeds the set value due to overload or mechanical failure, a signal will be output to stop the motor and the reducer 22. When the overload disappears, the connection will be restored automatically to prevent mechanical damage. The input end drive and measurement system 2 also includes a second angle meter 27; the second angle meter 27 is connected to the input rocker arm of the electro-hydraulic steering gear 1. The second angle meter 27 can realize direct and accurate measurement of small angles, and is used for tests with high requirements for angle measurement accuracy, such as free clearance measurement.

[0039] In a feasible implementation of the present invention, the second torque sensor 35 is also connected to an angle encoder 36; a tension pressure sensor 38 is also provided between the connection adjustment mechanism connection 37 and the servo oil cylinder 39. The loading shaft 33 and the output shaft 7 of the electro-hydraulic steering gear 1 are connected via a spline sleeve 31, and the spline sleeve 31 is cooperatively connected to the output shaft 7 of the electro-hydraulic steering gear 1 and can be replaced according to different product interfaces.

[0040] In a feasible implementation of the utility model, the oil supply pump station 51 and the power pump 52 are both connected to an external circulating water cooling system 53 to ensure that the oil works stably within the temperature range required by the test. Pressure gauges 55 are provided at the outlet pipe and the inlet pipe of the external circulating water cooling system 53. The oil supply pump station 51 and the power pump 52 are both arranged in a soundproof cover 54, which can effectively control the noise of the hydraulic station.

[0041] In a feasible implementation manner of the utility model, the oil supply and power system 5 also includes a flow meter 56 and a pressure sensor 57; the flow meter 56 and the pressure sensor 57 are arranged on the pipeline between the electro-hydraulic steering gear 1 and the oil supply pump station 51, and the flow meter 56 and the pressure sensor 57 are also arranged on the pipeline between the power pump 52 and the servo cylinder 39.

[0042] In a feasible implementation manner of the utility model, the electrical and control system 4 includes an industrial computer 42 and a data acquisition unit 41 connected in sequence; the industrial computer 42 is also equipped with a printer 43, a display 44 and a keyboard 45; the data acquisition unit 41 is electrically connected to the servo motor 21, the reducer 22, the torque limiter 23, the first angle meter 24, the first torque sensor 25, the second angle meter 27, the second torque sensor 35, the angle encoder 36, the pull-pressure sensor 38, the oil supply pump station 51, the power pump 52 and the electro-hydraulic steering gear 1 respectively.

[0043] The working process of the utility model is as follows:

[0044] 1) First, the electro-hydraulic steering gear 1 is installed and fixed on the test bench base 8. The driving part of the electro-hydraulic steering gear 1 is connected to the test bench input end driving and measurement system 2. The test bench input end is driven and controlled by the servo motor 21. The speed of the input shaft 6 is set according to the test requirements;

[0045] 2) The oil inlet and outlet of the electro-hydraulic steering gear 1 are respectively connected to the high-pressure oil pipe and the low-pressure oil pipe of the oil supply pump station 51, and a flow meter 56 is connected to the oil line to collect flow and temperature data;

[0046] 3) The output part of the electro-hydraulic steering gear 1 is connected to the loading and measuring system 3 at the output end of the test bench, and the servo cylinder 39 used at the loading end is connected to the power pump 52. The loading torque value can be set according to different test requirements; when the output end is in a no-load condition, the output shaft 7 of the electro-hydraulic steering gear 1 can be directly disconnected from the loading and measuring system 3 at the output end of the test bench;

[0047] The electro-hydraulic steering gear 1 controller is connected to the test bench through the CAN communication harness. The built-in CAN communication file of the test bench can meet the requirements of sending fixed speed or variable speed messages according to different tests.

[0048] It should be noted that the data acquisition and control methods used by the electrical and control system 4 of the utility model are mature algorithms. The utility model does not improve the algorithm. Preferably, the data acquisition unit 41 can use the signal adapter board TED-3012 / MCS-TEST 1001A single-board servo controller assembly. The utility model provides an installation method similar to the original vehicle, including the hydraulic system and electromechanical transmission device required for simulating actual working conditions such as road resistance and steering wheel. The test bench is also equipped with sensors for measuring oil pressure, angle and torque. The performance and reliability of the electro-hydraulic power steering gear can be tested in accordance with industry test standards, and non-standard tests of the electro-hydraulic steering gear 1 can also be performed according to the requirements of different vehicle manufacturers.

[0049] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electro-hydraulic power steering test bench, characterized in that: include: An input end drive and measurement system (2), the input end drive and measurement system (2) comprising a servo motor (21), a first angle meter (24), a first torque sensor (25), and a universal joint (26) connected in sequence; the universal joint (26) is connected to an input shaft (6) of the electro-hydraulic steering gear (1) via an input fixture; An output end loading and measuring system (3), the output end loading and measuring system (3) comprising a second torque sensor (35), a bearing seat (34) and a loading shaft (33) connected in sequence; the loading shaft (33) is connected to an output shaft (7) of the electro-hydraulic steering gear (1); a loading swing arm (32) is fixed on the bearing seat (34), and a force arm of the loading swing arm (32) is connected in sequence to a connection adjustment mechanism (37) and a servo oil cylinder (39); An oil supply and power system (5), the oil supply and power system (5) comprising an oil supply pump station (51) and a power pump (52); the oil supply pump station (51) is used to provide an oil source for the electro-hydraulic steering gear (1); the power pump (52) is used to provide oil pressure power for the servo oil cylinder (39); An electrical and control system (4), wherein the electrical and control system (4) is electrically connected to the input end drive and measurement system (2), the output end loading and measurement system (3) and the oil supply and power system (5), respectively.

2. The electro-hydraulic power steering test bench according to claim 1, characterized in that: A reducer (22) and a torque limiter (23) are arranged in sequence between the servo motor (21) and the first inclinometer (24).

3. The electro-hydraulic power steering test bench according to claim 1, characterized in that: The input end driving and measuring system (2) further comprises a second inclinometer (27); the second inclinometer (27) is connected to an input rocker arm of the electro-hydraulic steering gear (1).

4. The electro-hydraulic power steering test bench according to claim 1, characterized in that: The second torque sensor (35) is also connected to an angle encoder (36); and a tension and pressure sensor (38) is also provided between the connection adjustment mechanism connection (37) and the servo oil cylinder (39).

5. The electro-hydraulic power steering test bench according to claim 1, characterized in that: The loading shaft (33) and the output shaft (7) of the electro-hydraulic steering gear (1) are connected via a spline sleeve (31).

6. The electro-hydraulic power steering test bench according to claim 1, characterized in that: The oil supply pump station (51) and the power pump (52) are both connected to an external circulating water cooling system (53).

7. The electro-hydraulic power steering test bench according to claim 6, characterized in that: Pressure gauges (55) are provided at both the outlet pipe and the inlet pipe of the external circulating water cooling system (53).

8. The electro-hydraulic power steering test bench according to claim 1, characterized in that: The oil supply pump station (51) and the power pump (52) are both arranged in a soundproof cover (54).

9. The electro-hydraulic power steering test bench according to claim 1, characterized in that: The oil supply and power system (5) further comprises a flow meter (56) and a pressure sensor (57); the flow meter (56) and the pressure sensor (57) are arranged on the pipeline between the electro-hydraulic steering gear (1) and the oil supply pump station (51); the flow meter (56) and the pressure sensor (57) are also arranged on the pipeline between the power pump (52) and the servo oil cylinder (39).

10. An electro-hydraulic power steering test bench according to any one of claims 1 to 9, characterized in that: The electrical and control system (4) comprises an industrial computer (42) and a data acquisition unit (41) which are connected in sequence; the data acquisition unit (41) is electrically connected to a servo motor (21), a reducer (22), a torque limiter (23), a first angle meter (24), a first torque sensor (25), a second angle meter (27), a second torque sensor (35), an angle encoder (36), a tension and pressure sensor (38), an oil supply pump station (51), a power pump (52) and an electro-hydraulic steering gear (1).

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