Steering gear and toothed plate type steering limit structure

Abstract

This utility model discloses a steering gear and a toothed plate type steering limit structure, including a reduction housing and an output shaft. The reduction housing has an extension with a groove. A toothed plate is slidably disposed within the groove. One end of the output shaft is connected to an input shaft, and the other end of the output shaft rotatably passes through the reduction housing and corresponds to the groove. The portion of the output shaft extending out of the reduction housing has teeth that mesh with the toothed plate. The groove has a first end and a second end. The toothed plate abuts against either the first or second end under the drive of the output shaft. The input shaft is connected to a steering wheel, which drives the output shaft to rotate via the steering column. When the steering wheel rotates, the rotational motion of the output shaft is converted into linear motion of the toothed plate through the meshing of the teeth and the toothed plate. The toothed plate abuts against both ends of the groove to achieve hard limiting. Compared with the prior art, this design simplifies the steering limit structure and reduces assembly complexity.

Description

Technical Field

[0001] This utility model relates to the field of automotive steering technology, specifically to a steering gear and a toothed plate type steering limit structure. Background Technology

[0002] As a core safety component of the automotive chassis, the reliability and driving comfort of the steering system are increasingly becoming a focus for users. With the innovation and application of steer-by-wire technology, the traditional mechanical intermediate shaft structure between the steering column and the steering gear has been eliminated, significantly increasing the design freedom of the steering column and steering wheel. However, this technological change introduces new safety hazards: due to the elimination of the intermediate shaft, the original mechanical hard-limit function of the steering gear can no longer be transmitted to the steering wheel through mechanical linkage. When the vehicle loses power or the controller malfunctions, the soft-limit mechanism relying on the electronic control software will completely fail, and the steering wheel can rotate an unlimited number of times in an unrestrained state, resulting in abnormal steering torque and even causing vehicle loss of control accidents.

[0003] The commonly used mechanical limiting structure (see patent CN202223576280.X) needs to include a guiding mechanism and a limiting mechanism. The guiding mechanism includes a guide block set on the outer wall of the limiting nut and a guide groove set on the inner wall of the sleeve. The limiting mechanism includes a first limiting part and a second limiting part located at both ends of the first thread. When the limiting nut is fed to the first limiting part or the second limiting part, the limiting nut can no longer be fed in the same direction. Although this solution can solve the turning limiting problem, it requires the coordinated action of multiple components such as the limiting nut, the guide groove, the first limiting part, and the second limiting part, which makes the assembly more complicated and increases the production cost of enterprises. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model proposes a steering gear and a toothed plate type steering limit structure. By meshing the gear teeth and the toothed plate, the rotational motion of the output shaft is converted into the linear motion of the toothed plate. The toothed plate abuts against both ends of the slide groove back and forth in the slide groove to achieve hard limiting. Compared with the prior art, this simplifies the steering limit structure and reduces assembly complexity.

[0005] The technical solution adopted by this utility model is as follows: a toothed plate type steering limit structure includes a reduction housing and an output shaft. The reduction housing is provided with an extension, and the extension is provided with a sliding groove. A toothed plate is slidably arranged in the sliding groove. One end of the output shaft is used to connect to an input shaft, and the other end of the output shaft is rotatably inserted through the reduction housing and correspondingly arranged in the sliding groove. The part of the output shaft extending out of the reduction housing is provided with gear teeth, which mesh with the toothed plate. The sliding groove has a first end and a second end. The toothed plate abuts against the first end or the second end under the drive of the output shaft.

[0006] Optionally, the top surface of the toothed plate protrudes beyond the top surface of the groove.

[0007] Optionally, the output shaft includes a gear section and a connecting section for connecting to the input shaft. The outer peripheral wall of the gear section is provided with gear teeth, and the toothed plate is provided with a plurality of rack teeth along the length direction. The axial length of the gear teeth is greater than the axial length of a single rack tooth.

[0008] Optionally, the diameter of the gear portion is smaller than the diameter of the connecting portion.

[0009] Optionally, the extension has a notch on the side away from the reduction gear housing, and the notch is provided corresponding to the output shaft.

[0010] Optionally, the extension and the deceleration housing are integrally die-cast.

[0011] This utility model also discloses a steering gear, including an input shaft, a sleeve, and the toothed plate steering limiting structure described above. One end of the reduction housing is provided with the extension, and the other end of the reduction housing is connected to the sleeve. The sleeve is disposed on the outer periphery of the input shaft and part of the output shaft, and the output shaft is coaxially connected to the input shaft.

[0012] The beneficial effects of this invention are as follows: The steering wheel drives the output shaft to rotate via the steering column. When the steering wheel rotates, the output shaft drives the toothed plate to move along the slide groove through the meshing of the gear teeth and the toothed plate. The rotational motion of the output shaft is converted into the linear motion of the toothed plate through the meshing of the gear teeth and the toothed plate. The toothed plate abuts against both ends of the slide groove to achieve hard limiting. Compared with the prior art, this invention simplifies the steering limiting structure and reduces assembly complexity. The length of the toothed plate and the length of the slide groove in the reduction housing can be adjusted according to requirements. By matching and adjusting the gear tooth structure and toothed plate structure parameters, the number of steering wheel rotations can be freely adjusted. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the steering gear proposed in an embodiment of the present utility model;

[0014] Figure 2 This is a schematic diagram of the toothed plate steering limit structure proposed in an embodiment of this utility model;

[0015] Figure 3 This is a schematic diagram of the deceleration housing of the toothed plate steering limit structure proposed in an embodiment of this utility model;

[0016] Figure 4 This is a schematic diagram of the toothed plate of the toothed plate type steering limiting structure proposed in an embodiment of this utility model;

[0017] Figure 5 This is a schematic diagram of the output shaft of the toothed plate steering limit structure proposed in an embodiment of this utility model.

[0018] The labels in the attached figures are as follows: 1. Reduction housing; 2. Output shaft; 21. Gear tooth; 22. Gear section; 23. Connecting section; 3. Extension section; 31. Slide groove; 311. First end; 312. Second end; 32. Notch; 4. Toothed plate; 41. Rack tooth; 5. Input shaft; 6. Sleeve; 7. Steering wheel. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0020] like Figures 1 to 5 As shown, this embodiment discloses a toothed plate type steering limit structure, including a reduction housing 1 and an output shaft 2. The reduction housing 1 is provided with an extension 3, and the extension 3 has a sliding groove 31. A toothed plate 4 is slidably arranged in the sliding groove 31. One end of the output shaft 2 is used to connect to an input shaft 5, and the other end of the output shaft 2 is rotatably inserted through the reduction housing 1 and correspondingly arranged in the sliding groove 31. The part of the output shaft 2 extending out of the reduction housing 1 is provided with gear teeth 21, and the gear teeth 21 mesh with the toothed plate 4. The sliding groove 31 has a first end 311 and a second end 312. The toothed plate 4 abuts against the first end 311 or the second end 312 under the drive of the output shaft 2. The input shaft 5 is connected to the steering wheel 7. The steering wheel 7 drives the output shaft 2 to rotate via the steering column. When the steering wheel 7 rotates, the output shaft 2 drives the toothed plate 4 to move along the slide groove 31 through the meshing of the gear teeth 21 and the rack teeth 41. The rotational motion of the output shaft 2 is converted into the linear motion of the toothed plate 4 through the meshing of the gear teeth 21 and the rack teeth 41. Hard limiting is achieved at both ends of the slide groove 31. Compared with the existing technology, the steering limiting structure is simplified and the assembly complexity is reduced. The length of the toothed plate 4 and the length of the slide groove 31 of the reduction housing 1 can be adjusted according to requirements. At the same time, by matching and adjusting the structural parameters of the gear teeth 21 and the rack teeth 41, the number of turns of the steering wheel 7 can be freely adjusted. The corresponding relationship between the number of turns of the steering wheel 7, the sliding distance of the toothed plate 4, and the parameters of the gear structure is as follows:

[0021] 7 turns of the steering wheel = (L / (m*π)) / Z;

[0022] Where m is the gear module of gear teeth 21 and rack teeth 41;

[0023] Z is the number of teeth on the gear;

[0024] L is the sliding stroke of the toothed plate 4 in the groove 31, which is half the difference between the length of the groove 31 and the length of the toothed plate 4 (the length of the groove 31 should be greater than the length of the toothed plate 4).

[0025] like Figure 2 As shown, the top surface of the toothed plate 4 protrudes from the top surface of the slide groove 31. This facilitates observation of the position of the toothed plate 4 to confirm its limiting state; at the same time, it avoids excessive constraint of the slide groove 31 on the movement of the toothed plate 4, reducing frictional resistance.

[0026] like Figure 4 and 5 As shown, the output shaft 2 includes a gear section 22 and a connecting section 23 for connecting to the input shaft 5. The outer peripheral wall of the gear section 22 is provided with gear teeth 21, and the toothed plate 4 is provided with a plurality of teeth 41 along its length. The axial length of the gear teeth 21 is greater than the axial length of a single tooth 41. This ensures that the gear teeth 21 remain engaged with the toothed plate 4 during the rotation of the output shaft 2, avoiding the risk of tooth disengagement due to displacement of the toothed plate 4.

[0027] like Figure 5 As shown, the diameter of the gear portion 22 is smaller than the diameter of the connecting portion 23.

[0028] like Figure 3 As shown, the extension 3 has a notch 32 on the side opposite to the reduction housing 1, and the notch 32 is correspondingly provided with the output shaft 2. The notch 32 is used to avoid interference and prevent the output shaft 2 from rubbing against the top surface of the slide groove 31 during rotation.

[0029] In this embodiment, the extension 3 and the reduction housing 1 are integrally die-cast. This eliminates assembly errors and improves the relative positional accuracy of the slide groove 31 and the output shaft 2.

[0030] like Figure 1 As shown, a steering gear includes an input shaft 5, a sleeve 6, and the aforementioned toothed plate 4 type steering limiting structure. One end of the reduction housing 1 is provided with the extension 3, and the other end of the reduction housing 1 is connected to the sleeve 6. The sleeve 6 is disposed on the outer periphery of the input shaft 5 and part of the output shaft 2, and the output shaft 2 is coaxially connected to the input shaft 5.

[0031] It is understood that the specific embodiments described above are merely for explaining the relevant utility model and not for limiting the utility model. It should also be noted that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not contradict or conflict with each other. All equivalent structural transformations made based on the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly included within the protection scope of this utility model.

Claims

1. A toothed plate type steering limit structure, characterized in that, The device includes a reduction gear housing and an output shaft. The reduction gear housing has an extension with a groove. A toothed plate is slidably disposed in the groove. One end of the output shaft is used to connect to an input shaft, and the other end of the output shaft rotatably passes through the reduction gear housing and is correspondingly disposed in the groove. The part of the output shaft extending out of the reduction gear housing has gear teeth that mesh with the toothed plate. The groove has a first end and a second end. The toothed plate abuts against the first end or the second end under the drive of the output shaft.

2. The toothed plate deflection limiter structure according to claim 1, characterized in that, The top surface of the toothed plate protrudes from the top surface of the groove.

3. The toothed plate deflection limiter structure according to claim 1, wherein The output shaft includes a gear section and a connecting section for connecting to the input shaft. The gear section has gear teeth on its outer peripheral wall. The toothed plate has multiple teeth along its length, and the axial length of the gear teeth is greater than the axial length of a single tooth.

4. The toothed plate deflection limiter structure according to claim 3, characterized in that, The diameter of the gear part is smaller than the diameter of the connecting part.

5. The toothed plate deflection limiter structure according to claim 1, wherein The extension has a notch on the side away from the deceleration housing, and the notch is corresponding to the output shaft.

6. The toothed plate deflection limiter structure according to claim 1, wherein The extension and the deceleration housing are integrally die-cast.

7. A diverter characterized by, The device includes an input shaft, a sleeve, and a toothed plate steering limit structure as described in any one of claims 1 to 6. One end of the reduction housing is provided with the extension, and the other end of the reduction housing is connected to the sleeve. The sleeve is disposed on the outer periphery of the input shaft and part of the output shaft, and the output shaft is coaxially connected to the input shaft.

Images