Testing tool of steering gear

Abstract

The utility model discloses a steering gear test tool, comprising a rack fixing device, the rack fixing device comprises two backstop parts, and the two backstop parts are respectively installed at two ends of a rack of a vehicle and abut against the rack; the torsion bar driving device comprises a mounting seat, a driving block and a driving part, the mounting seat is mounted on the steering gear assembly, the driving block extends in the radial direction of the input shaft, the driving block is arranged on the input shaft of the steering gear in a sleeving mode and matched with a spline of the input shaft, and the driving part is movably mounted on the mounting seat and abuts against the driving block. According to the steering gear assembly test tool provided by the utility model, the current can be more accurately adjusted, the adjusting method is simple, the safety of the whole device can be more stable through the corresponding structure, and the rebounding and springback conditions cannot occur.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle manufacturing, and in particular relates to a test tool for a steering gear. Background Art

[0002] The electric power steering system is installed under the steering wheel of the car and plays a role in turning during driving. The electric power steering system must ensure safety on the whole vehicle. During the research and development process, it is necessary to verify the ability of the electric power steering system to work normally in a specific electromagnetic environment and to test whether it does not cause unacceptable interference to other equipment in the environment. EMC, or electromagnetic compatibility testing, refers to a test that evaluates the ability of electronic equipment or systems to work normally in an electromagnetic environment and not cause unacceptable interference to other equipment in the environment. Its purpose is to ensure that the electromagnetic radiation of electronic products is within an acceptable range, and at the same time ensure that the product has sufficient anti-interference ability in a complex electromagnetic environment, so as not to affect the normal functioning of its own functions and the normal operation of other equipment.

[0003] The existing test method has limited requirements for the working conditions and working current of the steering gear assembly. The current adjustment process uses a locked-rotor method. The adjustment steps for applying torque to the input shaft are relatively complicated. When rotating the input shaft to apply torque, the motor current signal is unstable and the adjustment takes a long time. During the test, the change of working conditions is unstable and requires two people to cooperate to complete it. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a test fixture for a steering gear, comprising: a rack fixing device, the rack fixing device comprising two stop parts, the two stop parts are respectively installed at the two ends of the rack of the vehicle and stop the rack; a torsion bar driving device, the torsion bar driving device comprises a mounting seat, a driving block and a driving part, the mounting seat is installed on the steering gear assembly, the driving block extends along the radial direction of the input shaft, the driving block is sleeved on the input shaft of the steering gear and cooperates with the spline of the input shaft, the driving part is movably mounted on the mounting seat, and the driving part stops the driving block. According to the steering gear assembly test fixture proposed by the utility model, the current can be adjusted more accurately, the adjustment method is simple, and the test can be completed by one person alone, and such a design can make the safety of the entire device more stable and there will be no rebound.

[0005] According to some embodiments of the utility model, the mounting seat has two side walls arranged opposite to each other, the two side walls are located on both radial sides of the input shaft, the driving block is installed between the two side walls, and the driving part is movably installed on the side walls along the spacing direction of the two side walls.

[0006] According to some embodiments of the present invention, the driving portion includes a plurality of driving bolts, at least one bolt is installed on each of the side walls, and the bolt is threadedly connected to the side wall.

[0007] According to some embodiments of the utility model, a plurality of the driving bolts are provided on each of the side walls, and the driving bolts installed on the same side wall are respectively located on both sides of the radial direction of the rotation axis of the driving block.

[0008] According to some embodiments of the utility model, the mounting seat also has a bottom wall, a through hole is provided in the center of the bottom wall, the two side walls are fixedly connected to the bottom wall, and the bottom wall is connected to the sensor upper cover of the steering gear assembly.

[0009] According to some embodiments of the utility model, a first mounting hole is provided on the bottom wall, and the first mounting hole is directly opposite to the mounting hole of the upper cover of the sensor, so that the mounting seat is connected to the upper cover of the sensor through a threaded connector.

[0010] According to some embodiments of the present invention, the end of the driving block facing the bottom wall is spaced apart from the bottom wall in the axial direction.

[0011] According to some embodiments of the present invention, the length of the driving block is not less than the distance between the two side walls, and the length of the driving block is not less than the distance between two adjacent driving bolts installed on the same side wall.

[0012] According to some embodiments of the utility model, the rack fixing device includes: a sleeve and two plugging covers, the sleeve is sleeved outside the rack, the two plugging covers are respectively threadedly connected to the two ends of the sleeve, and the plugging covers are suitable for stopping the ends of the rack.

[0013] According to some embodiments of the present invention, the test fixture of the steering gear also includes: a torque sensor, a controller and a motor, the torque sensor is installed on a torsion bar connected to the output end of the input shaft, and the motor and the torque sensor are electrically connected to the controller respectively.

[0014] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0016] Figure 1 It is a three-dimensional structural schematic diagram of a steering gear test tool according to some embodiments of the utility model;

[0017] Figure 2 is a side view of a steering gear test fixture according to some embodiments of the utility model;

[0018] Figure 3 is a schematic structural diagram of a driving block according to some embodiments of the utility model;

[0019] Figure 4 is a schematic structural diagram of the input shaft of the steering gear assembly according to some embodiments of the utility model;

[0020] Figure 5 It is a schematic diagram of the cooperation between the torsion bar drive device and the input shaft mounting seat according to some embodiments of the utility model;

[0021] Figure 6 is a top view of a mounting base according to some embodiments of the utility model;

[0022] Figure 7 is a front view of a mounting base according to some embodiments of the utility model;

[0023] Figure 8 is a side view of a mounting base according to some embodiments of the utility model;

[0024] Fig. 9 is a schematic diagram of a three-dimensional structure of a mounting base according to some embodiments of the utility model;

[0025] Fig.10 is a schematic structural diagram of a sleeve according to some embodiments of the utility model;

[0026] Fig.11 It is a schematic structural diagram of a blocking cover according to some embodiments of the utility model.

[0027] Reference numerals:

[0028] Steering gear test fixture 100;

[0029] Rack fixing device 1; stopper 11; sleeve 13; plug cover 14;

[0030] Torsion bar driving device 2; mounting seat 21; side wall 211; bottom wall 212; driving block 22; driving part 23; driving bolt 231;

[0031] Steering gear assembly 3;

[0032] Input shaft 4; spline 41; sensor cover 42; keyway 43;

[0033] Through hole 5;

[0034] First mounting hole 6;

[0035] Mounting hole 7 of the upper cover; threaded connector 71. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] The following will refer to the attached Figure 1-11 The utility model is described in detail in conjunction with the embodiments.

[0038] In order to better reflect the test tooling designed in the present invention, the improved test method is briefly introduced first, and the test tooling is used in conjunction with the test method.

[0039] The utility model provides a test fixture 100 for a steering gear, comprising: a rack fixing device 1 and a torsion bar driving device 2.

[0040] The rack fixing device 1 includes two stoppers 11, which are respectively mounted at both ends of the rack of the vehicle and stop against the rack. The rack fixing device 1 is used to fix the rack. Specifically, the two stoppers 11 stop against both ends of the rack to prevent the rack from moving, which can prevent the rack from moving during the test by physical blocking. This plays a role in fixing the input shaft 4 of the steering gear that is connected to the upstream of the rack.

[0041] The torsion bar drive device 2 includes a mounting seat 21, a drive block 22 and a drive portion 23. The mounting seat 21 is installed on the steering gear assembly 3. In some specific examples, the mounting seat 21 is installed on the sensor cover 42 of the steering gear assembly 3 at the upper end of the input shaft 4 in the vertical direction. The mounting seat 21 is directly installed on the sensor cover 42 of the steering gear assembly 3, which can make the entire torsion bar drive device 2 and the input shaft 4 tightly combined, reduce the additional space occupation, and achieve a compact structure.

[0042] The driving block 22 extends radially along the input shaft 4 and is sleeved on the input shaft 4 of the steering gear. The driving block 22 extends radially along the input shaft 4 and is sleeved on the input shaft 4. This design can more effectively utilize space and improve transmission efficiency. In some embodiments, Figure 3 and Figure 4As shown, a circle of splines 41 is provided on the input shaft 4, and a keyway 43 is provided on the driving block. The keyway 43 on the driving block 22 can be sleeved on the input shaft 4 and matched with the spline 41 of the input shaft 4, ensuring that the connection between the keyway 43 and the spline 41 is firm and can transmit accurate torque and rotation. The spline 41 connection has self-locking properties, which can prevent relative sliding when transmitting torque, thereby improving the stability of the system. The driving part 23 is movably mounted on the mounting seat 21, and the driving part 23 stops at the driving block 22. This design allows the driving part 23 to adjust its position as needed, and the driving block 22 can move with the movement of the driving part 23. The driving part 23 can directly act on the driving block 22 to achieve the precise transmission control effect of the entire torsion bar drive device 2.

[0043] According to the test fixture 100 of a steering gear of the utility model, by setting a rack fixing device 1 and a torsion bar driving device 2, the rack fixing device 1 can be used to clamp the end of the rack to make the steering gear assembly 3 in a working state, the rack displacement remains unchanged, and the motor of the steering gear assembly 3 is in a working state. During the operation of the motor of the steering gear assembly 3, due to the rack clamping the motor, the shaft of the steering gear assembly 3 cannot rotate normally or rotates extremely slowly, and is almost in a static state. This situation is usually accompanied by a significant increase in the motor current. At this time, the magnitude of the motor current can be adjusted by adjusting the torque of the input shaft 4 through the torsion bar driving device 2.

[0044] The test fixture 100 proposed in the utility model drives the drive block 22 through the drive part 23 installed on the mounting seat 21 of the torsion bar drive device 2. The drive block 22 can cooperate with the spline 41 of the input shaft 4 to rotate the input shaft 4 clockwise or counterclockwise, thereby controlling the increase or decrease of the torsion bar force of the input shaft 4 by adjusting the displacement change of the drive part 23. According to the test fixture 100 of the steering gear proposed in the utility model, the current can be adjusted more accurately, the adjustment method is simple, and such a design can make the safety of the entire device more stable and there will be no rebound.

[0045] In some embodiments, Figure 5As shown, the mounting seat 21 has two side walls 211 arranged opposite to each other. Optionally, the two side walls 211 are arranged relatively parallel in the vertical direction. The relatively parallel side walls 211 provide a stable supporting environment for the driving block 22 and the driving part 23. Since the interval between the side walls 211 is constant, the driving part 23 can remain stable when moving, reducing unnecessary vibration and shaking, thereby improving the overall stability of the torsion bar driving device 2. The two side walls 211 are located on both sides of the radial direction of the input shaft 4, that is, the input shaft 4 is clamped between the two opposite side walls 211 of the mounting seat 21, and the driving block 22 is installed between the two side walls 211. When the driving block 22 moves between the two relatively parallel side walls 211, its motion trajectory is a straight line or a predictable curve. This precise motion trajectory helps to achieve precise control of the torque transmission between the driving block 22 and the input shaft 4. The driving part 23 is movably mounted on the side wall 211 along the spacing direction of the two side walls 211, that is, the driving part 23 can be telescopically moved between the two side walls 211 along the spacing direction of the two side walls 211, and the two side walls 211 can stably support the driving block 22 to telescopically move in the horizontal direction, ensuring that the driving block 22 will not produce unnecessary shaking or vibration during operation, thereby improving the stability and reliability of the entire torsion bar driving device 2. As the displacement of the driving part 23 changes, the position of the driving block 22 also moves horizontally between the two side walls 211 with the movement of the driving part 23, thereby stably adjusting the force magnitude of the torque of the input shaft 4. This arrangement can achieve that when the driving part 23 moves according to the operation of the tester, the two side walls 211 can prevent the driving block 22 from producing lateral displacement in the radial direction, thereby ensuring that the torque can be transmitted along a predetermined path, avoiding energy loss and unnecessary wear.

[0046] In some embodiments, Figure 1 and Figure 2 As shown, the driving part 23 includes a plurality of driving bolts 231, at least one driving bolt 231 is installed on each side wall 211, and optionally, the driving bolt 231 can be an M8×0.5 driving bolt 231, and at least one driving bolt 231 installed on each side wall 211 is distributed on a different side of the input shaft 4 from the driving bolt 231 installed on another side wall 211. When the driving bolts 231 are installed on both side walls 211, it can be ensured that the force on the driving part 23 is evenly distributed, which helps to prevent deformation or damage of the test fixture due to uneven force. The driving bolt 231 is threadedly connected to the side wall 211, and by rotating the driving bolt 231 on the side wall 211, the position of the driving part 23 between the side walls 211 can be accurately adjusted, so that the test of the torsion bar drive device 2 is more efficient and concise, and the test results are more accurate.

[0047] In some embodiments, each side wall 211 is provided with a plurality of driving bolts 231, and the driving bolts 231 installed on the same side wall 211 are respectively located on both radial sides of the rotation axis of the driving block 22. The plurality of driving bolts 231 are distributed on both sides of the driving block 22, which can provide more uniform and stable support, and effectively prevent the deformation or damage of the test fixture due to uneven force. And when the driving bolts 231 are distributed on both radial sides of the rotation axis of the driving block 22, a stable torque balance can be formed to prevent the driving block 22 from deflecting or shaking during the rotation process.

[0048] In some embodiments, Figure 4 , Figure 5 and Fig. 9 As shown, the mounting seat 21 also has a bottom wall 212, and a through hole 5 is provided at the center of the bottom wall 212. The input shaft 4 can pass through the through hole 5 at the center of the bottom wall 212 to penetrate the entire mounting seat 21, so that the drive block 22 on the mounting seat 21 can be co-centrically matched with the input shaft 4, ensuring that the connection between the drive block 22 and the input shaft 4 is tight and the transmission is accurate, thereby improving the overall performance of the steering gear assembly 3. At the same time, the through hole 5 is provided at the center of the bottom wall 212, so that the installation position can be adjusted according to the design of different steering gear assemblies 3 models, increasing the adaptability and flexibility of the test fixture 100 of the steering gear. The two side walls 211 are fixedly connected to the bottom wall 212, so that the overall structure of the mounting seat 21 is compact and occupies little space. The bottom wall 212 is connected to the sensor upper cover 42 of the steering gear assembly 3, which can facilitate the installation of the torsion bar drive device 2 on the steering gear assembly 3, and is also convenient for future maintenance and replacement. Such a design reduces the complexity of installation and maintenance, improves work efficiency, and also provides a solid foundation for the entire steering gear test fixture 100, ensuring that the steering gear test fixture 100 is stable during operation.

[0049] In some embodiments, Figure 6-9As shown, the bottom wall 212 is provided with a first mounting hole 6, and the first mounting hole 6 is directly opposite to the mounting hole 7 of the sensor cover 42, so that the mounting seat 21 is connected to the sensor cover 42 through a threaded connector 71. The mounting seat 21 is tightly connected to the sensor cover 42 through the threaded connector 71, which effectively improves the stability of the entire steering gear test fixture 100. Optionally, the bolt used by the threaded connector 71 is an M6 bolt, and the M6 ​​bolt connects and fixes the first mounting hole 6 on the bottom wall 212 and the mounting hole 7 of the sensor cover 42. This design can ensure that there is no relative displacement or looseness between the mounting seat 21 and the sensor cover 42 during the test, thereby ensuring the accuracy of the test results. The mounting seat 21 is connected to the sensor cover 42 through a threaded connector 71, so that when maintenance or replacement of parts is required, it is convenient to disassemble and reinstall, reducing maintenance costs. By rotating the threaded connector 71, the installation or disassembly work can be completed quickly, improving the efficiency of the test work.

[0050] Among them, Figure 4 As shown, in the structure of the steering gear assembly 3, a sensor is provided above the input shaft 4, and a sensor cover 42 is provided above the sensor. The sensor cover 42 is installed on the housing of the steering gear assembly 3 through a threaded connector 71. When the test fixture 100 of the steering gear of the utility model is used, the sensor cover 42 can be removed, and the mounting seat 21 of the torsion bar drive device 2 can be installed at this position using the original threaded hole. The above structure can utilize the original sensor structure to realize the installation of the test fixture 100 of the steering gear, which is easy to operate and simple in structure.

[0051] In some embodiments, Figure 2 As shown, the end of the driving block 22 facing the bottom wall 212 is spaced apart from the bottom wall 212 in the axial direction, that is, the end of the driving block 22 facing the bottom wall 212 of the mounting seat 21 is not in direct contact with the bottom wall 212 of the mounting seat 21 in the axial direction, and there is a certain distance between the driving block 22 and the bottom wall 212 in the axial direction. Such a spacing arrangement can ensure that the driving block 22 will not interfere with the bottom wall 212 during movement, and maintain the smoothness and accuracy of the movement of the driving block 22. At the same time, such an arrangement can also provide a certain space for installation and maintenance, and facilitate necessary adjustments and operations.

[0052] In some embodiments, Figure 5As shown, the length of the driving block 22 is not less than the spacing between the two side walls 211, and the length of the driving block 22 is not less than the spacing between two adjacent driving bolts 231 installed on the same side wall 211. In the design of the mounting seat 21, the two side walls 211 are arranged opposite to each other, and the two side walls 211 are located on both sides of the radial direction of the input shaft 4 to form a clamping space. The spacing of this clamping space is the spacing between the two side walls 211. When the length of the driving block 22 is not less than the spacing between the side walls 211, the driving block 22 can form a closer contact with the side walls 211, reducing the shaking and vibration that may be generated during the movement of the driving block 22, thereby enhancing the stability of the entire system. At the same time, the length of the driving block 22 is not less than the spacing between the side walls 211, which can also limit the rotation angle range of the driving block 22. When the driving bolt 231 on the mounting frame is extended and retracted, the driving block 22 can stably follow the driving bolt 231 to rotate, reducing the occurrence of unstable factors such as vibration of the driving block 22 caused by gap or looseness. The length of the driving block 22 is not less than the distance between two adjacent driving bolts 231 installed on the same side wall 211. This design allows the driving block 22 to be in contact with the driving bolts 231, so that each driving bolt 231 can provide driving force for the driving block 22, preventing the problem of the driving block 22 and the driving bolt 231 not being in contact with each other.

[0053] In some embodiments, Fig.10 and Fig.11 As shown, the rack fixing device 1 includes: a sleeve 13 and two plugging covers 14. The sleeve 13 is sleeved outside the rack, and the two plugging covers 14 are respectively threadedly connected to the two ends of the sleeve 13. This arrangement enables the plugging covers 14 to be tightly fixed on the sleeve 13, and it is also convenient to adjust the position of the plugging covers 14 according to actual needs to adapt to racks of different lengths. The plugging covers 14 are suitable for stopping the ends of the rack. This arrangement can effectively prevent the rack from shaking or shifting during the transmission process. By designing plugging covers 14 that match the shape and size of the rack at both ends of the vehicle rack, the stopper 11 can be tightly fitted to the rack to provide a stable fixing effect.

[0054] In some embodiments, the test fixture 100 of the steering gear also includes: a torque sensor, a controller and a motor. The torque sensor is installed on the torsion bar connected to the output end of the input shaft 4. The system needs to determine the magnitude of the assist provided by the motor according to the actual torque applied, so as to achieve accurate matching of the steering assist. This setting can detect the steering torque applied by the tester on the steering wheel in real time. The motor and the torque sensor are electrically connected to the controller respectively. The torque sensor converts the detected torque signal into an electrical signal, and then transmits these signals to the controller. The motor outputs a suitable steering assist torque according to the instructions of the controller.

[0055] The practical method and adjustment principle of the steering gear test fixture 100 are described below with reference to the embodiment according to the present utility model.

[0056] The test method steps of the steering gear test fixture 100 are as follows:

[0057] Sleeve the sleeve 13 outside the rack of the steering gear assembly 3, so that the sleeve 13 is concentric with the rack, the plug cover 14 cooperates with the internal thread of the sleeve 13, and the rack at the other end of the steering gear assembly 3 operates in unison; remove the M6 ​​bolts of the sensor cover 42 at the input shaft 4 of the steering gear, align the mounting seat 21 with the sensor cover 42, and then tighten the M6 ​​bolts to install it to the housing position of the sensor. Power on the steering gear assembly 3 (working mode) and monitor the working current; use the drive block 22 to cooperate with the spline 41 of the input shaft 4 of the steering gear assembly 3, adjust the drive part 23, that is, the drive bolt 231 installed on the side plate of the mounting seat 21, the end of the drive bolt 231 can support the drive block 22, rotate the drive bolt 231 to increase the torque of the input shaft 4, and adjust the current to the working mode.

[0058] The test adjustment principle is:

[0059] Simulate that the steering gear assembly 3 works normally during the driving process of the vehicle. When the racks at both ends of the steering gear assembly 3 are locked with the sleeve 13, the rotation displacement of the input shaft 4 is 0°, and the motor current is adjusted by the torque of the torsion bar of the input shaft 4 measured by the torque sensor. Place the mounting seat 21 above the sensor cover 42, and install the mounting seat 21 to the position of the sensor cover 42 with M6 bolts. Power on the steering gear assembly 3 (working mode); use the drive block 22 to cooperate with the input shaft 4 to rotate the input shaft 4 clockwise or counterclockwise, and adjust the M8×0.75 bolt (drive part 23) to increase or decrease the force on the torsion bar of the input shaft 4 according to the rotation displacement change of the drive bolt 231.

[0060] In some embodiments, the test device proposed in the present invention is made of 45# steel or a material with higher strength, so that the overall test fixture is not easily deformed and has a higher load bearing capacity.

[0061] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0062] In the description of the present invention, "plurality" means two or more.

[0063] In the description of the present invention, a first feature being “above” or “below” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact but are in contact with each other via another feature therebetween.

[0064] In the description of the present invention, a first feature “above”, “over” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0066] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A test fixture for a steering gear, characterized in that: include: A rack fixing device (1), the rack fixing device (1) comprising two stopper parts (11), the two stopper parts (11) being respectively mounted on two ends of a rack of a vehicle and abutting against the rack; A torsion bar drive device (2), the torsion bar drive device (2) comprising a mounting seat (21), a drive block (22) and a drive portion (23), the mounting seat (21) being mounted on a steering gear assembly (3), the drive block (22) extending radially along an input shaft (4), the drive block (22) being sleeved on the input shaft (4) of the steering gear and cooperating with a spline (41) of the input shaft (4), the drive portion (23) being movably mounted on the mounting seat (21), and the drive portion (23) being stopped against the drive block (22).

2. The test fixture for the steering gear according to claim 1, characterized in that: The mounting seat (21) has two side walls (211) arranged opposite to each other, the two side walls (211) are located on both radial sides of the input shaft (4), the driving block (22) is installed between the two side walls (211), and the driving part (23) is movably installed on the side walls (211) along the spacing direction of the two side walls (211).

3. The test fixture for the steering gear according to claim 2, characterized in that: The driving portion (23) comprises a plurality of driving bolts (231), at least one driving bolt (231) is installed on each of the side walls (211), and the driving bolt (231) is threadedly connected to the side wall (211).

4. The test fixture for the steering gear according to claim 3, characterized in that: A plurality of driving bolts (231) are provided on each of the side walls (211), and the driving bolts (231) installed on the same side wall (211) are respectively located on both sides of the radial direction of the rotation axis of the driving block (22).

5. The test fixture for the steering gear according to claim 2, characterized in that: The mounting seat (21) also has a bottom wall (212), a through hole (5) is provided at the center of the bottom wall (212), the two side walls (211) are fixedly connected to the bottom wall (212), and the bottom wall (212) is connected to the sensor upper cover (42) of the steering gear assembly (3).

6. The test fixture for the steering gear according to claim 5, characterized in that: The bottom wall (212) is provided with a first mounting hole (6), and the first mounting hole (6) is directly opposite to the mounting hole of the sensor upper cover (42), so that the mounting seat (21) and the sensor upper cover (42) are connected via a threaded connector (71).

7. The test fixture for the steering gear according to claim 5, characterized in that: The end of the driving block (22) facing the bottom wall (212) is spaced apart from the bottom wall (212) in the axial direction.

8. The test fixture for the steering gear according to claim 4, characterized in that: The length of the driving block (22) is not less than the distance between the two side walls (211), and the length of the driving block (22) is not less than the distance between two adjacent driving bolts (231) installed on the same side wall (211).

9. The test fixture for the steering gear according to claim 1, characterized in that: The rack fixing device (1) comprises: a sleeve (13) and two plugging covers (14); the sleeve (13) is sleeved outside the rack; the two plugging covers (14) are respectively threadedly connected to two ends of the sleeve (13); and the plugging covers (14) are suitable for abutting against the ends of the rack.

10. The test fixture for the steering gear according to any one of claims 1 to 9, characterized in that: Also includes: A torque sensor, a controller and a motor, wherein the torque sensor is mounted on a torsion bar connected to the output end of the input shaft (4), and the motor and the torque sensor are electrically connected to the controller respectively.

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