Testing device for vehicle steering system

Abstract

The utility model discloses a testing device for a vehicle steering system, and the device comprises a pedestal which is provided with a box body, and the interior of the box body is provided with a testing cavity suitable for accommodating the steering system; a part of the spraying assembly is connected with the box body, and the end part of the spraying assembly is accommodated in the testing cavity and selectively sprays muddy water into the testing cavity; and the air cylinder assembly is arranged on the base, a part of the air cylinder assembly extends into the testing cavity, the air cylinder assembly is provided with an output end in power connection with the steering system, and the air cylinder assembly selectively drives the output end to reciprocate in the axial direction so as to drive the steering system to move synchronously. According to the testing device for the vehicle steering system, the testing device adopts the air cylinder assembly to drive the steering system to move, the testing requirement of muddy water durable actuation is met, and the cost of the whole testing device is reduced.

Description

Technical Field

[0001] The present application relates to the field of testing equipment, and in particular to a testing device for a vehicle steering system. Background Art

[0002] In related technologies, the electric power steering system is usually installed below the column at the bottom of the car's steering wheel and above the chassis frame. Since a large area is exposed to the outside, muddy roads during vehicle operation will cause a large amount of mud and sand to adhere to the electric power steering system. The sealing position of the electric power steering system will fail during the continuous operation of the system. Therefore, it is necessary to perform a mud and water durability test on the electric power steering system. The existing electric power steering system mud and water durability test equipment requires a motor device to apply a load to the input end, and the overall test equipment cost is extremely high. Utility Model Content

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present application is to provide a testing device for a vehicle steering system, which uses a cylinder assembly to drive the steering system to move, meets the testing requirements of muddy and water durability, and reduces the cost of the overall testing device.

[0004] According to an embodiment of the present application, a test device for a vehicle steering system includes: a base, a box body is provided on the base, and a test cavity suitable for accommodating the steering system is formed in the box body; a spray assembly, a portion of the spray assembly is connected to the box body, an end of the spray assembly is accommodated in the test cavity and can selectively spray muddy water into the test cavity; a cylinder assembly, the cylinder assembly is provided on the base and a portion of the cylinder assembly extends into the test cavity, the cylinder assembly has an output end connected to the power of the steering system, and the cylinder assembly can selectively drive the output end to move back and forth in the axial direction to drive the steering system to move synchronously.

[0005] According to the test device for a vehicle steering system according to the embodiment of the present application, the test device is provided with a cylinder assembly on a base. The cylinder assembly has an output end connected to the power of the steering system, and the cylinder assembly can selectively drive the output end to move back and forth axially to drive the steering system to move synchronously, thereby meeting the test requirements of mud and water durability actuation, eliminating the motor in the prior art, and being able to be installed on different product platforms while reducing the cost of the overall test device and improving the reliability of the test device.

[0006] In some embodiments of the present application, the cylinder assembly includes: a mounting bracket, which is arranged on the base and extends in the height direction; a cylinder body, which is located at the free end of the mounting bracket and connected to the mounting bracket; a first connecting rod, which is configured as the output end, and is located on the side of the cylinder body facing the box body, and a portion of the first connecting rod is accommodated in the test cavity, one end of the first connecting rod is connected to the cylinder body power, and the other end of the first connecting rod is connected to the steering system power.

[0007] In some embodiments of the present application, a piston is provided at one end of the first connecting rod, the piston is located inside the cylinder body and divides the cavity inside the cylinder body into a first cavity and a second cavity, and a first air hole and a second air hole are formed on the cylinder body, the first air hole is connected to the first cavity, and the second air hole is connected to the second cavity.

[0008] In some embodiments of the present application, the cylinder assembly also includes: a second connecting rod, which is located on the side of the cylinder body away from the box body, and the end of the second connecting rod is connected to the piston; a limit member, which is arranged on the outer peripheral wall of the first connecting rod and the second connecting rod; and a buffer member, which is arranged between the limit member and the cylinder body and is sleeved on the outer peripheral wall of the first connecting rod and the second connecting rod.

[0009] In some embodiments of the present application, a first threaded portion is formed on the inner peripheral wall of the limiting member, and a second threaded portion threadedly engaged with the first threaded portion is formed on the outer peripheral walls of the first connecting rod and the second connecting rod.

[0010] In some embodiments of the present application, the steering system has a tie rod, and an adapter is provided between the first connecting rod and the tie rod.

[0011] In some embodiments of the present application, the box body has a reinforcement layer and a thermal insulation layer, the reinforcement layer is arranged on the outer wall of the thermal insulation layer, and a test cavity is formed inside the thermal insulation layer.

[0012] In some embodiments of the present application, the spray assembly includes: a spray head, which is constructed in multiple numbers and is arranged at intervals in the test cavity; a sprinkler, which is connected to the spray head through a pipe, and the sprinkler can selectively transport muddy water to the sprinkler head through the pipe and spray the muddy water into the test cavity through the sprinkler head.

[0013] In some embodiments of the present application, the testing device includes: a refrigeration assembly, which has a refrigerator and a refrigeration plate connected thereto, the refrigeration plate being accommodated in the test cavity and located between the sprinkler head and the top plate of the box, the refrigeration plate being suitable for heat exchange with the test cavity; and a heating assembly, which is connected to the test cavity and can selectively deliver hot air into the test cavity.

[0014] In some embodiments of the present application, a first fixing member and a second fixing member are provided in the test chamber, the first fixing member is connected to the bottom wall of the box, the second fixing member is connected to the steering system, and the second fixing member can selectively slide on the first fixing member to adjust the position of the steering system.

[0015] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 is a structural schematic diagram of a testing device for a vehicle steering system according to an embodiment of the present application;

[0018] Figure 2 yes Figure 1 Schematic diagram of the structure of the middle cylinder assembly;

[0019] Figure 3 yes Figure 1 Schematic diagram of the structure of the middle box and its internal parts;

[0020] Figure 4 yes Figure 1 Schematic diagram of the cross section of the middle box.

[0021] Reference numerals:

[0022] 10. Test device;

[0023] 11. Base; 12. Box; 121. Test cavity; 122. Reinforcement layer; 123. Insulation layer;

[0024] 124. First fixing member; 125. Second fixing member; 126. Metal handle; 127. External panel;

[0025] 13. Spray assembly; 131. Spray head; 132. Sprayer; 133. Spray pipe;

[0026] 14. Cylinder assembly; 141. Mounting bracket;

[0027] 142, cylinder body; 1421, first air hole; 1422, second air hole; 1423, regulating valve;

[0028] 143. First connecting rod; 144. Second connecting rod; 145. Limiting member; 146. Buffer member; 147. Adapter;

[0029] 15. Refrigeration assembly; 151. Refrigeration plate; 16. Heating assembly; 20. Steering system; 21. Pull rod. DETAILED DESCRIPTION

[0030] The following describes in detail embodiments of the present application. 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 application and are not to be construed as limiting the present application.

[0031] Reference below Figure 1-Figure 4 A test device 10 for a vehicle steering system according to an embodiment of the present application is described. The test device 10 includes a base 11, a spray assembly 13 and a cylinder assembly 14. A box 12 is provided on the base 11, and a test cavity 121 suitable for accommodating a steering system 20 is formed in the box 12. Part of the spray assembly 13 is connected to the box 12, and the end of the spray assembly 13 is accommodated in the test cavity 121 and can selectively spray muddy water into the test cavity 121. The cylinder assembly 14 is provided on the base 11 and part of the cylinder assembly 14 extends into the test cavity 121. The cylinder assembly 14 has an output end connected to the power of the steering system 20. The cylinder assembly 14 can selectively drive the output end to move back and forth along the axial direction to drive the steering system 20 to move synchronously.

[0032] At present, the electric power steering system is usually installed below the column at the bottom of the car's steering wheel and above the chassis frame. Since a large area is exposed to the outside, muddy roads during vehicle operation will cause a large amount of mud and sand to adhere to the electric power steering system. The sealing position of the electric power steering system will fail during the continuous operation of the system. Therefore, it is necessary to perform a mud and water durability test on the electric power steering system. The existing electric power steering system mud and water durability test equipment requires motor equipment to apply a load to the input end, and the overall test equipment cost is extremely high.

[0033] Specifically, if Figure 1As shown, the test device 10 may include a base 11, a spray assembly 13 and a cylinder assembly 14. A box 12 may be provided on the base 11, and a test cavity 121 may be formed inside the box 12. The test cavity 121 can be used to accommodate the vehicle's steering system 20, and the inside of the test cavity 121 can be used to simulate the vehicle's driving environment and detect the durability of the steering system 20. It should be noted that the steering system 20 mentioned in this application may be an electric power steering system.

[0034] Furthermore, part of the spray assembly 13 can be connected to the box body 12, and the end of the spray assembly 13 can be accommodated in the test cavity 121. When the steering system 20 is tested, the spray assembly 13 can spray muddy water into the test cavity 121 through the end, so that the muddy water adheres to the surface of the steering system 20, simulating the environment of the vehicle driving on a muddy road, and verifying the ability of the seals in the system to withstand muddy water.

[0035] like Figure 2 As shown, the cylinder assembly 14 can be set on the base 11, and part of the cylinder assembly 14 can extend into the test cavity 121. It should be noted that extending part of the cylinder assembly 14 into the test cavity 121 can avoid the cylinder assembly 14 as a whole being in a simulated environment, which affects the normal operation of the cylinder assembly 14. The cylinder assembly 14 can have an output end, which can be connected to the steering system 20 power, and the cylinder assembly 14 can selectively drive the output end to move back and forth along the axial direction, so that the output end drives the steering system 20 to move synchronously, simulating the steering system 20 in actual operation. In order to improve the reliability of the test, the prior art uses a motor to drive the steering system 20. When the motor is placed in the test cavity 121, the water vapor in the test cavity 121 will evaporate into the motor during the actuation process, affecting the service life and operation stability of the motor; when the motor is placed outside the test cavity 121, the adjustment of the placement and input end angle is difficult to match all projects, and a large amount of tooling is required for each product to match the installation of the steering system 20, which increases the cost. Therefore, the use of the cylinder assembly 14 can more effectively meet the actuation requirements of the steering system 20 and reduce the cost of the overall test device 10.

[0036] In short, the test device 10 for the vehicle steering system of the embodiment of the present application is provided with a cylinder assembly 14 on the base 11. The cylinder assembly 14 has an output end connected to the power of the steering system 20, and the cylinder assembly 14 can selectively drive the output end to move back and forth axially to drive the steering system 20 to move synchronously, thereby meeting the test requirements of mud and water durability actuation, eliminating the motor in the prior art, and being able to reduce the cost of the overall test device 10 while being installed on different product platforms, thereby improving the reliability of the test device 10.

[0037] like Figure 2As shown, in some embodiments of the present application, the cylinder assembly 14 may include a mounting bracket 141, a cylinder body 142, and a first connecting rod 143. The mounting bracket 141 may be disposed on the base 11 and may extend in the height direction. The cylinder body 142 may be disposed at the free end of the mounting bracket 141, and the cylinder body 142 and the mounting bracket 141 may be detachably connected by screws or bolts. The first connecting rod 143 may be configured as an output end and may be located on the side of the cylinder body 142 facing the housing 12. A portion of the first connecting rod 143 may be accommodated in the test cavity 121. One end of the first connecting rod 143 may be power-connected to the cylinder body 142, and the other end of the first connecting rod 143 may be power-connected to the steering system 20. The cylinder body 142 drives the first connecting rod 143 to reciprocate axially, thereby causing the first connecting rod 143 to drive the steering system 20 to reciprocate synchronously, thereby meeting the test requirements of muddy water durability actuation.

[0038] like Figure 2 As shown, in some embodiments of the present application, a piston may be provided at one end of the first connecting rod 143 facing the cylinder body 142, the piston may be located inside the cylinder body 142, and the piston may separate the inside of the cylinder body 142 into a first cavity and a second cavity, and a first air hole 1421 and a second air hole 1422 are also formed on the surface of the cylinder body 142, the first air hole 1421 may be connected to the first cavity, and the second air hole 1422 may be connected to the second cavity, and gas is respectively delivered and extracted into and from the first cavity and the second cavity through the first air hole 1421 and the second air hole 1422 to realize reciprocating motion of the piston inside the cylinder body 142, thereby causing the piston to drive the first connecting rod 143 to reciprocate along the axial direction, and a regulating valve 1423 may also be provided on the cylinder body 142 to adjust the air pressure.

[0039] like Figure 2As shown, in some embodiments of the present application, the cylinder assembly 14 may further include a second connecting rod 144, which may be arranged on a side of the cylinder body 142 away from the box body 12, and an end of the second connecting rod 144 may extend into the cylinder body 142 and be connected to the piston. It can be understood that one end of the piston is connected to the first connecting rod 143, and the other end of the piston is connected to the second connecting rod 144. When the piston moves, it can simultaneously drive the first connecting rod 143 and the second connecting rod 144 to move synchronously. The limiting member 145 can be constructed as two, and the limiting members 145 can be respectively arranged on the outer peripheral walls of the first connecting rod 143 and the second connecting rod 144. The limiting member 145 can limit the moving distance of the first connecting rod 143 and the second connecting rod 144. The buffer member 146 can be arranged Between the limiter 145 and the cylinder body 142, there are two buffer members 146, which can be respectively sleeved on the outer peripheral walls of the first connecting rod 143 and the second connecting rod 144. The buffer members 146 can play a role of buffering and reducing vibration during the movement of the first connecting rod 143 and the second connecting rod 144, thereby buffering the impact between the limiter 145 and the cylinder body 142 at the extreme position. In some embodiments, the buffer member 146 can be configured as a spring. When the piston moves toward the box body 12, the buffer member 146 sleeved on the outer wall of the second connecting rod 144 can abut against the cylinder body 142 to play a buffering role. When the piston moves away from the box body 12, the buffer member 146 sleeved on the outer wall of the first connecting rod 143 can abut against the cylinder body 142 to play a buffering role. In a specific embodiment, the cylinder body 142 can be configured as a bidirectional synchronous cylinder.

[0040] Furthermore, the inner peripheral wall of the limit member 145 can be formed with a first threaded portion, and the outer peripheral wall of the first connecting rod 143 and the second connecting rod 144 can be formed with a second threaded portion. The second threaded portion can be threadedly engaged with the first threaded portion to adjust the position of the limit member 145, and then adjust the stroke of the first connecting rod 143 and the second connecting rod 144 to match the stroke requirements of the electric power steering system.

[0041] like Figure 2 As shown, in some embodiments of the present application, the steering system 20 has a pull rod 21, and an adapter 147 can also be provided between the first connecting rod 143 and the pull rod 21. Due to the different sizes between the first connecting rod 143 and the pull rod 21, the adapter 147 can realize the power connection between the first connecting rod 143 and the pull rod 21, thereby transmitting the load of the cylinder assembly 14 and improving the reliability of the cylinder assembly 14.

[0042] like Figure 4As shown, in some embodiments of the present application, the box body 12 may have a reinforcing layer 122 and an insulating layer 123. The outer lining of the reinforcing layer 122 may be made of PP material plate. PP material is polypropylene material. Polypropylene is light in weight and has a high heat deformation temperature and thermal stability. It can maintain stable performance at high temperatures. The inner lining of the reinforcing layer 122 may be made of stainless steel. Stainless steel is corrosion-resistant and improves the service life of the box body 12. The insulating layer 123 may be arranged on the inner side of the reinforcing layer 122, and a test cavity 121 may be formed inside the insulating layer 123. In a specific embodiment, the insulating layer 123 may be made of polyurethane and fiberglass to ensure the stability of the temperature inside the box body 12. A metal handle 126 may also be provided on the top of the box body 12, and an outer plate 127 may also be provided inside the box body 12. The outer plate 127 can wrap the refrigeration plate 151 on the top of the box body 12 to avoid spraying of mud and water.

[0043] like Figure 3 As shown, in some embodiments of the present application, the spray assembly 13 may include a spray head 131 and a sprinkler 132. The spray head 131 may be configured as a plurality, and the plurality of spray heads 131 may be spaced apart within the test cavity 121. The sprinkler 132 may be connected to the spray head 131 via a pipe, and the sprinkler 132 may selectively transport muddy water through the pipe to the spray head 131 and spray the muddy water into the test cavity 121 via the spray head 131. The end of the spray head 131 may also be provided with a spray pipe 133. By adjusting the spray pipe 133, the muddy water can be sprayed to a specified sealing position according to method requirements. The spray head 131 may also be provided with a control valve. By controlling the control valve, the muddy water flow rate of the spray pipe 133 can be adjusted. The use of multiple spray heads 131 can enable the muddy water to cover a wider area and meet the actual working conditions of the vehicle. In a specific embodiment, the sprinkler 132 may be configured as a mud pump.

[0044] like Figure 1 As shown, in some embodiments of the present application, the test device 10 may further include a refrigeration assembly 15 and a heating assembly 16. The refrigeration assembly 15 includes a refrigerator and a refrigeration plate 151 connected thereto. The refrigeration plate 151 may be housed in the test cavity 121, and the refrigeration plate 151 may be located between the spray head 131 and the top plate of the box body 12, thereby preventing the spray head 131 from spraying muddy water onto the refrigeration plate 151. The refrigeration plate 151 may exchange heat with the test cavity 121, thereby lowering the temperature in the test cavity 121 and providing a cooling function for the test cavity 121. The heating assembly 16 may be in communication with the test cavity 121 and may selectively deliver hot air into the test cavity 121, thereby changing the temperature in the test cavity 121 and enabling the test cavity 121 to meet various environmental conditions.

[0045] like Figure 3As shown, in some embodiments of the present application, a first fixing member 124 and a second fixing member 125 may be provided in the test cavity 121, the first fixing member 124 can be connected to the bottom wall of the box body 12, and the second fixing member 125 can be connected to the steering system 20. Optionally, a detachable connection can be formed between the second fixing member 125 and the steering system 20 by screws or bolts, and the second fixing member 125 can selectively slide on the first fixing member 124 to adjust the position of the steering system 20. Therefore, the position of the steering system 20 in the test cavity 121 can be appropriately adjusted by using the first fixing member 124 and the second fixing member 125.

[0046] Specifically, during the actual test, the steering system 20 is placed in the test chamber 121 and mounted on the first fixing member 124. The pull rod 21 of the steering system 20 is fixed to the adapter 147. Based on the rack displacement stroke of the steering system 20, the limiter 145 is adjusted to make the stroke of the cylinder assembly 14 greater than the rack displacement stroke of the steering system 20, meeting the full stroke requirement of the steering system 20. The cylinder assembly 14 is turned on, and the internal pressure of the cylinder body 142 is changed by adjusting the regulating valve 1423 so that the sample actuation speed meets the "10-15 times / min" full stroke actuation. After the mud and water durability test, the cycle overview is: Condition 1 → Condition 2 → Condition 1 → Condition 3, a total of 24 hours as one cycle, where

[0047] Condition 1 is spraying, lasting 6 hours, with cylinder assembly 14 turned on, spray assembly 13 turned on, refrigeration assembly 15 turned off, and heating assembly 16 turned off. Condition 2 is drying, lasting 6 hours, with cylinder assembly 14 turned off, spray assembly 13 turned off, refrigeration assembly 15 turned off, and heating assembly 16 turned on. Condition 3 is cooling, lasting 6 hours, with cylinder assembly 14 turned off, spray assembly 13 turned off, refrigeration assembly 15 turned on, and heating assembly 16 turned off. According to the vehicle service life assessment definition table, the 15-year 300,000-kilometer indicator of the whole vehicle is converted to 8,000 hours. According to the mechanical bench conversion rate assessment of the whole vehicle service life, the bench fatigue time is 320 hours. Therefore, the number of mud and water endurance cycles is 13 cycles in total. According to the response test conditions, the main circuit is set under the corresponding conditions, and the switch is controlled by the single-chip microcomputer. The PC end controls the start and stop of the corresponding equipment matching condition type at the corresponding time. After the overall completion of 13 cycles, the equipment beeps to remind the completion of the test.

[0048] In the description of the present application, 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 application and simplifying the description, and do 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 should not be understood as a limitation on the present application.

[0049] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0050] In the description of this application, “plurality” means two or more.

[0051] In the description of the present application, a first feature being “on” or “under” a second feature may include the first and second features being in direct contact with each other, or the first and second features being in contact with each other not directly but via another feature therebetween.

[0052] In the description of this application, a first feature “on”, “above” 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.

[0053] Throughout this specification, reference to terms such as "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 present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0054] Although the embodiments of the present application 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 intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A testing device for a vehicle steering system, characterized in that: include: A base, wherein a box is provided on the base, and a test cavity suitable for accommodating the steering system is formed in the box; a spray assembly, a portion of which is connected to the box, an end of which is received in the test cavity and can selectively spray muddy water into the test cavity; A cylinder assembly is arranged on the base and a portion of the cylinder assembly extends into the test cavity. The cylinder assembly has an output end connected to the power of the steering system. The cylinder assembly can selectively drive the output end to move back and forth in the axial direction to drive the steering system to move synchronously.

2. The testing device for a vehicle steering system according to claim 1, characterized in that: The cylinder assembly comprises: A mounting bracket, the mounting bracket being arranged on the base and extending in a height direction; a cylinder body, the cylinder body being located at a free end of the mounting bracket and connected to the mounting bracket; A first connecting rod, the first connecting rod is configured as the output end, the first connecting rod is located on the side of the cylinder body facing the box body, a portion of the first connecting rod is accommodated in the test cavity, one end of the first connecting rod is connected to the cylinder body power, and the other end of the first connecting rod is connected to the steering system power.

3. The testing device for a vehicle steering system according to claim 2, characterized in that: A piston is provided at one end of the first connecting rod, and the piston is located inside the cylinder body and divides the cavity inside the cylinder body into a first cavity and a second cavity. A first air hole and a second air hole are formed on the cylinder body, and the first air hole is connected to the first cavity, and the second air hole is connected to the second cavity.

4. The testing device for a vehicle steering system according to claim 3, characterized in that: The cylinder assembly further comprises: a second connecting rod, the second connecting rod being located on a side of the cylinder away from the box body, and an end portion of the second connecting rod being connected to the piston; a limiting member, the limiting member being provided on the outer peripheral wall of the first connecting rod and the second connecting rod; A buffer component is provided between the limiting component and the cylinder body and is sleeved on the outer peripheral walls of the first connecting rod and the second connecting rod.

5. The testing device for a vehicle steering system according to claim 4, characterized in that: A first threaded portion is formed on an inner peripheral wall of the position-limiting member, and a second threaded portion threadably matched with the first threaded portion is formed on outer peripheral walls of the first connecting rod and the second connecting rod.

6. The testing device for a vehicle steering system according to claim 2, characterized in that: The steering system comprises a pull rod, and an adapter is provided between the first connecting rod and the pull rod.

7. The testing device for a vehicle steering system according to claim 1, characterized in that: The box body comprises a reinforcement layer and a heat-insulating layer. The reinforcement layer is arranged on the outer wall of the heat-insulating layer. A test cavity is formed inside the heat-insulating layer.

8. The testing device for a vehicle steering system according to claim 1, characterized in that: The spray assembly comprises: A shower head, wherein the shower heads are multiple and spaced apart in the test chamber; A sprinkler is connected to the sprinkler head through a pipe. The sprinkler can selectively transport muddy water to the sprinkler head through the pipe and spray the muddy water into the test cavity through the sprinkler head.

9. The testing device for a vehicle steering system according to claim 8, characterized in that: include: a refrigeration assembly comprising a refrigerator and a refrigeration plate connected thereto, the refrigeration plate being housed in the test cavity and located between the spray head and the top plate of the box, the refrigeration plate being suitable for exchanging heat with the test cavity; A heating assembly is in communication with the test cavity and can selectively deliver hot air into the test cavity.

10. The testing device for a vehicle steering system according to claim 1, characterized in that: A first fixing member and a second fixing member are provided in the test cavity. The first fixing member is connected to the bottom wall of the box body, and the second fixing member is connected to the steering system. The second fixing member can selectively slide on the first fixing member to adjust the position of the steering system.

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