A steering wheel fixture for steady state testing

Abstract

The utility model provides a kind of steering wheel fixing device of steady state test.The steering wheel fixing device of steady state test includes chuck mechanism and locking mechanism;The locking mechanism includes the shell being arranged on the chuck mechanism, the center shaft being connected to the shell and chuck mechanism, the ratchet wheel being arranged on the center shaft and being linked with the chuck mechanism, the toothed disc being rotatably arranged on the side of the ratchet wheel, the engagement driving part for driving the toothed disc rotation to be engaged with the ratchet wheel, and the telescopic driving part for driving the toothed disc and engagement driving part displacement to make the toothed disc close to or away from the direction of ratchet wheel.The utility model not only can effectively lock steering wheel, prevent the reverse rotation and inertial rotation of steering wheel corner in test process, reduce the error generated in test process, but also can reduce procurement and maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of automotive handling stability testing technology, and in particular to a steering wheel fixing device for steady-state testing. Background Technology

[0002] To ensure driving safety, vehicle handling stability is a crucial indicator. According to the test methods provided in GB / T 6323-2014 "Test Methods for Vehicle Handling Stability," steady-state turning tests and steering return tests strictly regulate steering wheel angle and torque. However, the torsional force on the steering wheel changes continuously during vehicle testing, especially when subjected to impacts from uneven road surfaces and the driver's subjective actions, causing the steering wheel to reverse and rotate due to inertia, resulting in errors and interference in the test data. Therefore, it is necessary to employ a steering assist device in vehicle testing that can prevent steering wheel reversal and inertial rotation, and accurately position the steering wheel angle.

[0003] A steering wheel limiting device, disclosed in patent publication number CN211668775U, includes a center disc, a diameter-adjustable clamping mechanism, a limiter, and a locking mechanism. During diameter adjustment, the clamping mechanism limits the center disc. One end of the limiter is connected to the center of the center disc via the locking mechanism, and the other end is fixed to the vehicle body to restrict the rotation of the center disc. The locking mechanism includes a pivot pin tube, a locking screw, and a pivot pin. The steering wheel is locked and released using the locking screw. The locking screw is inserted into a hole in the pivot pin tube and then secured with a nut or cotter pin. Therefore, the locking screw and the screw hole in the pivot pin tube have a clearance fit. This clearance causes the steering wheel to reverse and bounce even after locking, making precise control impossible.

[0004] For example, the existing patent publication number CN209802680U discloses an anti-reverse steering assist device for automobile handling and stability testing, which uses a worm gear transmission device to lock the steering wheel. The self-locking function of the worm gear effectively prevents the steering wheel from reversing and bouncing, avoiding errors in the steering wheel angle test results. However, the worm gear is a precision component, resulting in high procurement and maintenance costs. Utility Model Content

[0005] The purpose of this invention is to provide a steering wheel fixing device for steady-state testing that reduces procurement and maintenance costs.

[0006] The technical solution of this utility model is: a steering wheel fixing device for steady-state testing, including a clamping mechanism for clamping the steering wheel, characterized in that it further includes a locking mechanism connected to the clamping mechanism and capable of transmitting driving force to the steering wheel through the clamping mechanism to lock the steering wheel; The locking mechanism includes a housing disposed on the clamping mechanism, a central shaft connected to the housing and the clamping mechanism, a ratchet disposed on the central shaft and linked to the clamping mechanism, a rotatable toothed disc disposed beside the ratchet, a meshing drive member for driving the toothed disc to rotate and mesh with the ratchet, and a telescopic drive member for driving the toothed disc and the meshing drive member to move so that the toothed disc moves closer to or away from the ratchet.

[0007] In the above scheme, the locking mechanism adopts a purely mechanical method with a toothed disc and a ratchet, which can not only effectively lock the steering wheel and prevent the steering wheel angle from reversing and rotating due to inertia during the test, thus reducing the error generated during the test, but also reduce procurement and maintenance costs.

[0008] Preferably, the engagement drive component includes a knob shaft, a limiting shell, a first spring, and a pin. The limiting shell is disposed inside the outer shell, one end of which is connected to the telescopic drive component, and the other end of which has an opening. The toothed disc is rotatably disposed in the opening. The lower end of the knob shaft is disposed in the limiting shell, and the pin is installed inside the lower end of the knob shaft. The first spring abuts against the knob shaft and the pin. The other end of the pin, away from the first spring, extends out of the knob shaft and contacts the toothed disc. The upper end of the knob shaft extends out of the outer shell.

[0009] Preferably, the knob shaft is provided with a knob cap, which is located outside the housing.

[0010] Preferably, the telescopic drive component includes a fixed sleeve, a push rod, a transmission rod, and a second spring. One end of the fixed sleeve is mounted on the housing, and the other end of the fixed sleeve is mounted on the push rod. One end of the transmission rod extends into the housing and connects to the engagement drive component, and the other end of the transmission rod is located inside the push rod. The second spring abuts against the transmission rod and the housing. The axial displacement of the push rod causes the toothed disc to move closer to or away from the ratchet.

[0011] Preferably, the inner wall of one end of the fixed sleeve where the push rod is mounted is provided with a plurality of first sliding teeth and second sliding teeth arranged in a circumferential manner, and the first sliding teeth and second sliding teeth are arranged alternately; the end of the push rod is provided with a plurality of first locking teeth in a circumferential manner, and the transmission rod is provided with second locking teeth that mesh with the first locking teeth. The axial displacement of the push rod pushes the second locking teeth to mesh with the first sliding teeth to form a first position, or pushes the second locking teeth to mesh with the second sliding teeth to form a second position. In the first position, the locking tooth disc is located close to the ratchet, and in the second position, the locking tooth disc is located away from the ratchet.

[0012] Preferably, the transmission rod includes a transmission shaft and a connecting rod. One end of the connecting rod extends into the housing and connects to the meshing drive component. The other end of the connecting rod is fitted onto the transmission shaft. The end of the transmission shaft away from the connecting rod is located inside the push rod. The second spring abuts against the connecting rod and the housing. The second locking tooth is located on the transmission shaft.

[0013] Preferably, the central shaft is provided with an upper spline and a lower spline, the clamping mechanism is provided with a first spline hole that mates with the lower spline, and the ratchet is provided with a second spline hole that mates with the upper spline.

[0014] Preferably, the clamping mechanism includes a clamping disc, a plurality of extension arms circumferentially connected to the clamping disc, and a fixing block connected to the extension arms via a connector. The fixing block is provided with a first clamping cavity for clamping the steering wheel, and the outer shell is connected to the clamping disc.

[0015] Preferably, the extension arm is provided with a sliding groove, and the connector is installed in the sliding groove.

[0016] Preferably, it also includes a fixing rod system, which includes a first rod, a second rod, and a fixing mechanism connected in sequence. The end of the first rod away from the second rod is mounted on the housing, and the fixing mechanism is provided with a second clamping cavity for mounting on the door rod.

[0017] Preferably, the outer casing is provided with a support, and the support is provided with a limiting countersunk hole. The first rod is connected to the support by a fastener, and the fastener is engaged in the limiting countersunk hole.

[0018] Preferably, the fixing mechanism includes two mating sleeves, forming a second clamping cavity between the two mating sleeves. One end of each sleeve is connected to a first ear plate, and the other end of each sleeve is connected to a second ear plate. A rotating joint is connected to the second ear plate, and the end of the second rod is fitted into the rotating joint. A ball bearing is provided between the rotating joint and the second rod.

[0019] Compared with related technologies, the beneficial effects of this utility model are as follows: I. The locking mechanism of this utility model adopts a purely mechanical method with the cooperation of a toothed disc and a ratchet, which can not only effectively lock the steering wheel and prevent the steering wheel angle from reversing and rotating due to inertia during the test, thus reducing the error generated during the test, but also reduce the procurement and maintenance costs. II. This utility model uses a telescopic drive component that engages with the first sliding tooth and the second sliding tooth respectively to achieve a press-lock structure similar to a ballpoint pen in the first and second positions, thereby realizing the locking and unlocking of the locking mechanism in the simplest, fastest and most convenient way. Third, this utility model can adapt to different sizes of car steering wheels or special handling stability equipment for test sites, and is easy and quick to install, thereby improving test efficiency and test accuracy. Fourth, this utility model can precisely control the steering wheel angle. Its ratchet and pawl cooperation structure improves the accuracy of steering wheel position locking, has high reliability, and good durability. 5. The fixed rod system is connected to a fixed mechanism that can output a rotary kinematic pair, so that the second rod can rotate, adjust the angle, and realize the adjustment of the up, down, left and right installation position of the clamping mechanism. Attached Figure Description

[0020] Figure 1 A schematic diagram of the installed steering wheel fixing device for steady-state testing provided by this utility model; Figure 2 This is a schematic diagram of the mounting structure of the chuck mechanism and the steering wheel; Figure 3 This is a schematic diagram of the installation structure of the fixing block and connectors; Figure 4 A longitudinal section diagram of the locking mechanism and clamping plate mounting location; Figure 5 A cross-sectional view of the locking mechanism; Figure 6 This is a schematic diagram of the internal structure of the fixing sleeve; Figure 7 This is a schematic diagram of the mounting structure of the push rod and drive shaft; Figure 8 This is a schematic diagram of the installation structure for fixing the rod system and the outer casing; Figure 9 This is a schematic diagram of the outer shell structure; Figure 10 This is a structural diagram of the fixed mechanism.

[0021] In the attached diagram: 1. Clamping mechanism; 11. Clamping disc; 111. First spline hole; 12. Extension arm; 121. Slide groove; 13. Fixing block; 131. First clamping cavity; 132. Upper block; 133. Lower block; 14. Connecting piece; 2. Locking mechanism; 21. Housing; 211. Upper housing; 212. Pad; 213. Support; 214. Limiting countersunk hole; 22. Central shaft; 221. Upper spline; 222. Lower spline; 23. Ratchet; 231. Second spline hole; 24. Gear disc; 25. Engaging drive component; 251. Knob cap; 252. Knob shaft; 253. Limiting shell; 2531. Opening; 254. First 255. Spring; 26. Pin; 27. Telescopic drive component; 28. Transmission rod; 29. ​​Fixing sleeve; 20. First sliding tooth; 21. Second sliding tooth; 22. Push rod; 23. First locking tooth; 24. Transmission shaft; 25. Second locking tooth; 26. Connecting rod; 27. Second spring; 28. Bearing; 39. Retaining ring; 30. Fixing rod system; 31. First rod; 32. Second rod; 33. Fixing mechanism; 331. Sleeve; 332. First ear plate; 333. Second ear plate; 334. Rotating joint; 335. Ball bearing; 336. Second clamping cavity; 338. Rubber pad; 4. Steering wheel; 5. Door rod. Detailed Implementation

[0022] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0023] like Figure 1 As shown, the steering wheel fixing device for steady-state testing provided in this embodiment includes a clamping mechanism 1, a locking mechanism 2, and a fixing rod system 3.

[0024] like Figure 2 As shown, the clamping mechanism 1 includes a clamping plate 11, a plurality of extending arms 12 circumferentially connected to the clamping plate 11, and a fixing block 13 connected to the extending arms 12 via a connector 14. The clamping plate 11 is provided with a first spline hole 111. Figure 3 As shown, the fixing block 13 includes an upper block 132 and a lower block 133. The upper block 132 and the lower block 133 are interlocked and connected by a connector 14 (bolt, nut, washer, etc.). A first clamping cavity 131 for clamping the steering wheel 4 is formed between the upper block 132 and the lower block 133 (e.g., ...). Figure 2 (As shown). The first clamping cavity 131 has two identical semicircular arcs to accommodate steering wheels 4 of different sizes.

[0025] The extension arm 12 is provided with a sliding groove 121, and the connector 14 is installed in the sliding groove 121. The fixing block 13 can be moved to a suitable position according to the size of the steering wheel 4, and then the connector 14 can be tightened to secure it. The clamping mechanism 1 can be detachably installed by disassembling the connector 14.

[0026] like Figure 4 , Figure 5 As shown, the locking mechanism 2 includes a housing 21 disposed on the clamping mechanism 1, a central shaft 22 connected to the housing 21 and the clamping mechanism 1, a ratchet 23 disposed on the central shaft 22 and linked to the clamping mechanism 1, a toothed disc 24 rotatably disposed beside the ratchet 23, an engagement drive 25 for driving the toothed disc 24 to rotate and engage with the ratchet 23, and a telescopic drive 26 for driving the toothed disc 24 and the engagement drive 25 to move so that the toothed disc 24 moves closer to or away from the ratchet 23.

[0027] like Figure 4 , Figure 5 As shown, the outer casing 21 includes an upper casing 211 and a pad 212 covering the lower end of the upper casing 211. The central shaft 22 is provided with an upper spline 221 and a lower spline 222. A bearing 27 and a retaining ring 28 are fitted onto the central shaft 22. The outer ring of the bearing 27 is installed inside the upper casing 211, and the bearing 27 is axially limited by the retaining ring 28. The ratchet 23 is provided with a second spline hole 231. The upper spline 221 mates with the second spline hole 231, and the lower spline 222 mates with the first spline hole 111. The pad 212 passes through the central shaft 22 with a gap.

[0028] like Figure 5 As shown, the toothed disc 24 is drum-shaped, with ratchet teeth on one side to engage with the ratchet wheel 23, and an arc-shaped groove on the other side to engage with the ejector pin 255. Three ratchet teeth are provided on each of the left and right sides of the toothed disc 24. Three arc-shaped grooves are provided on the toothed disc 24.

[0029] like Figure 4 , Figure 5 As shown, the engagement drive component 25 includes a knob cap 251, a knob shaft 252, a limiting shell 253, a first spring 254, and a pin 255. The limiting shell 253 is disposed inside the outer shell 21. One end of the limiting shell 253 is connected to the connecting rod 264 in the telescopic drive component 26, and the other end of the limiting shell 253 has an opening 2531. The drum-shaped toothed disc 24 is rotatably disposed in the opening 2531, and the rotation is such that the toothed disc 24 rotates along... Figure 5 Rotate slightly left and right in the direction shown.

[0030] The lower end of the knob shaft 252 is located in the limiting shell 253, and the upper end of the knob shaft 252 extends out of the outer shell 21 and connects to the knob cap 251. The ejector pin 255 is installed inside the lower end of the knob shaft 252. The first spring 254 abuts against the knob shaft 252 and the ejector pin 255. The other end of the ejector pin 255, away from the first spring 254, extends out of the knob shaft 252 and contacts the arc groove on the toothed disc 24.

[0031] The telescopic drive component 26 can adopt a locking structure that is pressed by a ballpoint pen. Specifically, the telescopic drive component 26 includes a fixed sleeve 261, a push rod 262, a transmission rod 260, and a second spring 265. One end of the fixed sleeve 261 is installed on the outer casing 21, and the push rod 262 is installed on the other end of the fixed sleeve 261. Figure 6 As shown, the inner wall of the fixing sleeve 261 on which the push rod 262 is mounted is provided with a plurality of first sliding teeth 2611 and second sliding teeth 2612 arranged in a circular pattern, and the first sliding teeth 2611 and second sliding teeth 2612 are arranged alternately. Figure 7 As shown, the end of the push rod 262 is provided with a plurality of first locking teeth 2621 in a circular shape.

[0032] The transmission rod 260 includes a transmission shaft 263 and a connecting rod 264. One end of the connecting rod 264 extends into the housing 21 and connects to the engagement drive member 25. The other end of the connecting rod 264 is fitted onto the transmission shaft 263. The end of the transmission shaft 263 away from the connecting rod 264 is located inside the push rod 262. The second spring 265 abuts against the connecting rod 264 and the housing 21. The transmission shaft 263 is provided with a second locking tooth 2631 that engages with the first locking tooth 2621. Under the pressing action of the push rod 262, the second locking tooth 2631 slides between the first sliding tooth 2611 and the second sliding tooth 2612.

[0033] The push rod 262 is axially displaced (pressed once), which pushes the second locking tooth 2631 to engage with the first sliding tooth 2611 to form a first position through the first locking tooth 2621. Pressing it again causes the first locking tooth 2621 to engage with the second sliding tooth 2612 to form a second position. In the first position, the locking disc 24 is positioned close to the ratchet 23; in the second position, the locking disc 24 is positioned away from the ratchet 23.

[0034] like Figure 1 As shown, the fixed rod system 3 includes a first rod 31, a second rod 32, and a fixing mechanism 33 connected in sequence. Figure 8 , Figure 9As shown, the outer casing 21 is provided with a support 213, and the support 213 is provided with a limiting countersunk hole 214. The first rod 31 is connected to the support 213 by a fastener, and the fastener is engaged in the limiting countersunk hole 214.

[0035] like Figure 1 As shown, the end of the first rod 31 away from the support 213 is hinged to the second rod 32. The end of the second rod 32 away from the first rod 31 is mounted on the fixing mechanism 33.

[0036] like Figure 10 As shown, the fixing mechanism 33 includes two mating sleeves 331, and a second clamping cavity 336 is formed between the two mating sleeves 331, as shown. Figure 1 As shown, the second clamping cavity 336 is clamped onto the door rod 5. One end of the retaining sleeve 331 is connected to a first ear plate 332, and the other end of the retaining sleeve 331 is connected to a second ear plate 333. The two first ear plates 332 are connected by a set of fasteners 337. A rotating joint 334 is connected to the second ear plate 333, and the two second ear plates 333 are connected to one end of the rotating joint 334 by another set of fasteners 337. The end of the second rod 32 is fitted into the rotating joint 334, and a ball bearing 335 is provided between the rotating joint 334 and the second rod 32. A rubber gasket 338 is provided on the inner wall of the retaining sleeve 331 forming the second clamping cavity 336.

[0037] In the initial state, the knob cap 251 is centered (e.g.) Figure 1 As shown), the chuck 24 does not contact the ratchet 23, the steering wheel 4 rotates freely, and the ratchet 23 moves with the steering wheel 4 under the action of the central shaft 22.

[0038] Pressing the push rod 262 displaces the drive shaft 263, pushing the connecting rod 264, the limiting shell 253, and the toothed disc 24 therein towards the ratchet 23. At this time, the second spring 265 is compressed. Releasing the push rod 262 causes the second tooth 2631 on the drive shaft 263 to slide along the sliding tooth track on the fixed sleeve 261 until it engages with the first sliding tooth 2611 to form a first position.

[0039] Rotating the knob cap 251 clockwise drives the toothed disc 24 to rotate counterclockwise via the knob shaft 252, the ejector pin 255, and the first spring 254. The teeth on the toothed disc 24 engage with the ratchet 23. When the steering wheel 4 rotates counterclockwise (to the left), the rotational moment is transmitted to the ratchet 23 through the clamping disc 11 and the central shaft 22. The ratchet 23 then transmits the moment to the toothed disc 24, causing the center of the toothed disc 24 to rotate clockwise. The toothed disc 24 rotates clockwise within the opening 2531, separating from the ratchet 23. Subsequently, the ejector pin 255, under the action of the first spring 254, applies a counterclockwise moment to the toothed disc 24, causing it to re-engage with the ratchet 23, thus locking the steering wheel 4. When the steering wheel is turned clockwise (e.g., to the right), the retaining plate 24 is subjected to a bending moment from the ratchet 23. This bending moment drives the retaining plate 24 to rotate counterclockwise, causing it to separate from the ratchet 23. Subsequently, the ejector pin 255, under the action of the first spring 254, applies a clockwise bending moment to the retaining plate 24, causing it to re-engage with the ratchet 23, thus locking the steering wheel 4.

[0040] Rotating the knob cap 251 counterclockwise drives the retaining plate 24 to rotate clockwise via the knob shaft 252, the ejector pin 255, and the first spring 254. The retaining teeth on the retaining plate 24 engage with the ratchet 23. When the steering wheel rotates clockwise (to the right), the retaining plate 24 experiences a bending moment from the ratchet 23, causing it to rotate counterclockwise and disengage from the ratchet 23. Subsequently, the ejector pin 255, under the action of the first spring 254, applies a clockwise bending moment to the retaining plate 24, causing it to re-engage with the ratchet 23, thus locking the steering wheel 4. When the steering wheel rotates counterclockwise (to the left), the retaining plate 24 experiences a bending moment from the ratchet 23, which drives it to rotate clockwise, disengaging it from the ratchet 23. Subsequently, the ejector pin 255, under the action of the first spring 254, applies a counterclockwise bending moment to the toothed disc 24, causing the toothed disc 24 to re-engage with the ratchet 23, thereby locking the steering wheel 4.

[0041] Press the push rod 262 again to push the second locking tooth 2631 on the drive shaft 263 to slide to the second position where it engages with the second sliding tooth 2612, and push the connecting rod 264, the limiting shell 253 and the locking tooth disc 24 on it away from the ratchet 23.

[0042] This utility model adopts a ratchet and toothed disc meshing drive structure, and is connected to the door rod through a fixed rod system on the outer shell. The meshing drive is driven by a telescopic drive with a ballpoint pen-style self-locking structure, which can effectively prevent the steering wheel from reversing during the test and causing test errors. It can also adapt to steering wheels of different sizes and is easy and quick to install.

[0043] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A steering wheel fixing device for steady-state testing, comprising a clamping mechanism (1) for clamping a steering wheel (4), characterized in that, It also includes a locking mechanism (2) connected to the clamping mechanism (1) and capable of transmitting driving force through the clamping mechanism (1) to the steering wheel (4) to lock the steering wheel (4). The locking mechanism (2) includes a housing (21) disposed on the clamping mechanism (1), a central shaft (22) connected to the housing (21) and the clamping mechanism (1), a ratchet (23) disposed on the central shaft (22) and linked to the clamping mechanism (1), a toothed disc (24) rotatably disposed beside the ratchet (23), a meshing drive (25) for driving the toothed disc (24) to rotate and mesh with the ratchet (23), and a telescopic drive (26) for driving the toothed disc (24) and the meshing drive (25) to move so that the toothed disc (24) moves closer to or away from the ratchet (23).

2. The steering wheel fixing device for steady-state testing according to claim 1, characterized in that, The engagement drive component (25) includes a knob shaft (252), a limiting shell (253), a first spring (254), and a ejector pin (255). The limiting shell (253) is located inside the outer shell (21). One end of the limiting shell (253) is connected to the telescopic drive component (26), and the other end of the limiting shell (253) has an opening (2531). The toothed disc (24) is rotatably disposed in the opening (2531). The knob shaft (252) The lower end of the knob shaft (252) is located in the limiting shell (253), the ejector pin (255) is installed inside the lower end of the knob shaft (252), the first spring (254) abuts between the knob shaft (252) and the ejector pin (255), the other end of the ejector pin (255) away from the first spring (254) extends to the outside of the knob shaft (252) and contacts the toothed disc (24); the upper end of the knob shaft (252) extends from the outer shell (21) to the outside.

3. The steering wheel fixing device for steady-state testing according to claim 1, characterized in that, The telescopic drive component (26) includes a fixed sleeve (261), a push rod (262), a transmission rod (260), and a second spring (265). One end of the fixed sleeve (261) is mounted on the outer shell (21), and the other end of the fixed sleeve (261) is mounted on the push rod (262). One end of the transmission rod (260) extends into the outer shell (21) and is connected to the meshing drive component (25). The other end of the transmission rod (260) is located inside the push rod (262). The second spring (265) abuts against the transmission rod (260) and the outer shell (21). The axial displacement of the push rod (262) causes the toothed disc (24) to move closer to or away from the ratchet (23).

4. The steering wheel fixing device for steady-state testing according to claim 3, characterized in that, The inner wall of one end of the fixed sleeve (261) on which the push rod (262) is mounted is provided with a plurality of first sliding teeth (2611) and second sliding teeth (2612) arranged in a circular pattern. The first sliding teeth (2611) and second sliding teeth (2612) are arranged alternately. The end of the push rod (262) is provided with a plurality of first locking teeth (2621) arranged in a circular pattern. The transmission rod (260) is provided with a second locking tooth (2631) that meshes with the first locking tooth (2621). When the push rod (262) is axially displaced, the first locking tooth (2621) pushes the second locking tooth (2631) to mesh with the first sliding tooth (2611) to form a first position, or pushes the second locking tooth (2631) to mesh with the second sliding tooth (2612) to form a second position. In the first position, the locking tooth disc (24) is located close to the ratchet (23). In the second position, the locking tooth disc (24) is located away from the ratchet (23).

5. The steering wheel fixing device for steady-state testing according to claim 4, characterized in that, The transmission rod (260) includes a transmission shaft (263) and a connecting rod (264). One end of the connecting rod (264) extends into the housing (21) and is connected to the meshing drive member (25). The other end of the connecting rod (264) is fitted onto the transmission shaft (263). The end of the transmission shaft (263) away from the connecting rod (264) is located inside the push rod (262). The second spring (265) abuts against the connecting rod (264) and the housing (21). The second locking tooth (2631) is located on the transmission shaft (263).

6. The steering wheel fixing device for steady-state testing according to claim 1, characterized in that, The central shaft (22) is provided with an upper spline (221) and a lower spline (222), the clamping mechanism (1) is provided with a first spline hole (111) that matches the lower spline (222), and the ratchet (23) is provided with a second spline hole (231) that matches the upper spline (221).

7. The steering wheel fixing device for steady-state testing according to claim 1, characterized in that, The clamping mechanism (1) includes a clamping plate (11), a plurality of extension arms (12) circumferentially connected to the clamping plate (11), and a fixing block (13) connected to the extension arms (12) via a connector (14). The fixing block (13) is provided with a first clamping cavity (131) for clamping the steering wheel (4). The outer shell (21) is connected to the clamping plate (11).

8. The steering wheel fixing device for steady-state testing according to claim 1, characterized in that, It also includes a fixing rod system (3), which includes a first rod (31), a second rod (32) and a fixing mechanism (33) connected in sequence. The end of the first rod (31) away from the second rod (32) is installed on the outer shell (21), and the fixing mechanism (33) is provided with a second clamping cavity (336) for installation on the door rod (5).

9. The steering wheel fixing device for steady-state testing according to claim 8, characterized in that, The outer shell (21) is provided with a support (213), and the support (213) is provided with a limiting countersunk hole (214). The first rod (31) is connected to the support (213) by a fastener, and the fastener is engaged in the limiting countersunk hole (214).

10. The steering wheel fixing device for steady-state testing according to claim 8, characterized in that, The fixing mechanism (33) includes two mating sleeves (331), forming a second clamping cavity (336) between the two mating sleeves (331). One end of the sleeve (331) is connected to a first ear plate (332), and the other end of the sleeve (331) is connected to a second ear plate (333). A rotating joint (334) is connected to the second ear plate (333), and the end of the second rod (32) is fitted into the rotating joint (334). A ball bearing (335) is provided between the rotating joint (334) and the second rod (32).

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