Steering input shaft in automobile electric power steering system
The arc triangle body design on the steering input shaft improves rigidity and assembly precision by ensuring smooth transitions and sufficient clearance, stabilizing the steering connection.
Patent Information
- Application Number
- CN202420788960.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-16
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-04-16
AI Technical Summary
The existing steering input shafts in automobile electric power steering systems suffer from insufficient rigidity due to sharp corners lacking transition arcs, leading to difficult assembly, instability, and unstable steering connections.
A steering input shaft design featuring an arc triangle body with three evenly distributed arc curved surfaces and smooth transitions, ensuring sufficient wall thickness and rigidity for stable rotation and assembly.
The arc triangle body design enhances the rigidity and ease of assembly, allowing smooth rotation and improved precision in the steering connection, addressing the instability and assembly challenges of previous designs.
Smart Images
Figure CN222291816U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of automobile electric power steering systems, and in particular relates to a steering input shaft in an automobile electric power steering system. Background Art
[0002] A steering input shaft of an automobile electric power steering system adopts a pointed triangle boss to connect with a matching steering gear; the prior art usually adopts a pointed triangle boss, as shown in the attached manual Figure 1 As shown, the sharp corners of the triangular boss have no transition arc.
[0003] As the instruction manual Figure 1 The three sides of the pointed triangular boss on the input shaft shown in the figure are thin and the wall thickness of the inner hole is insufficient for rigidity. At the same time, there is insufficient clearance when docking with the center of the triangular recessed hole of the matching gear, making it difficult to rotate and assemble, and the steering is unstable. In addition, the sharp corners of the triangular boss on the input shaft have no transition arc, which cannot ensure the rigidity of the steering connection.
[0004] Therefore, the utility model provides a steering input shaft in an automobile electric power steering system to solve the technical problem in the prior art that the side of the sharp-angled triangular boss has no transition arc, resulting in insufficient rigidity of the steering connection. Utility Model Content
[0005] In view of the problems raised by the above background technology, the purpose of the utility model is to provide a steering input shaft in an electric power steering system of an automobile.
[0006] In order to achieve the above technical purpose, the technical solution adopted by the utility model is as follows:
[0007] A steering input shaft in an automobile electric power steering system comprises an input shaft body, wherein the input shaft body comprises a large end, a small end and a steering gear concave hole, an arc triangle body is arranged at the large end of the input shaft body, the arc triangle body is provided with three side surfaces, and the three side surfaces are all arc curved surfaces, the three arc curved surfaces are evenly distributed with an axis center line as a reference, and the steering gear concave hole is butted with the arc triangle body.
[0008] Further defined, adjacent arc surfaces are connected by smooth transition arcs. Such a structural design can ensure that there is sufficient wall thickness between the arc surface and the inner hole of the input shaft, thereby ensuring the rigidity of the steering connection.
[0009] It is further defined that the contour of the arc surface is 0.05 mm, and the central angles of the three arc surfaces are 120 degrees each other and are evenly distributed. Such a structural design can further improve the rigidity of the arc triangle and increase the gap between the arc triangle and the steering gear concave hole.
[0010] It is further defined that the R angles of the three arc surfaces are all 25 mm.
[0011] It is further defined that the arc R angle formed between adjacent arc surfaces is 2.5 mm.
[0012] Beneficial effects of the utility model:
[0013] The three sides of the pointed triangular boss on the electric power steering input shaft of the prior art are thinner than the wall thickness of the inner hole, and the rigidity is insufficient. At the same time, there is not enough clearance when docking with the center of the triangular recessed hole of the matching gear, which makes rotation difficult and the steering is unstable. In addition, the sharp corners of the triangular boss on the input shaft do not have a transition arc, which cannot ensure the rigidity of the steering connection. The arc triangle body (special shape boss) of the utility model is docked with the matching special recessed hole of the steering gear, which can ensure that the input shaft turns smoothly in the matching special recessed hole of the steering gear and has enough clearance to ensure normal rotation. At the same time, there are arc transitions between the three arc sides of the arc triangle body (special shape boss) to ensure the rigidity of the steering connection. In summary, the utility model adopts high-precision connection in the steering input shaft of the automobile electric power steering machine, which can further improve the high precision of assembly on the basis of the existing assembly precision, and at the same time can make assembly easier and make the steering input shaft of the automobile steer more smoothly. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The present invention can be further described by the non-limiting embodiments given in the accompanying drawings;
[0015] Figure 1 It is a front view of a steering input shaft in an electric power steering system for an automobile in the prior art;
[0016] Figure 2 This is a front view of an embodiment of a steering input shaft in an electric power steering system for an automobile according to the utility model;
[0017] Figure 3 It is a front view of an arc triangle body 4 of an embodiment of a steering input shaft in an electric power steering system for an automobile according to the utility model;
[0018] The symbols of the main components are explained as follows: input shaft body 1, large end 2, small end 3, arc triangle body 4, steering gear recess 5. DETAILED DESCRIPTION
[0019] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The technical solution in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.
[0020] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0021] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model. It should be understood that the specific embodiments described here are only used to explain the present utility model and are not used to limit the present utility model.
[0022] like Figure 1 As shown, a steering input shaft in an automobile electric power steering system of the utility model comprises an input shaft body 1, the input shaft body 1 comprises a large end 2 and a small end 3, an arc triangle body 4 is provided at the large end 2 of the input shaft body 1, the arc triangle body 4 is provided with three side surfaces, and the three side surfaces are all arc curved surfaces, and the three arc curved surfaces are evenly distributed with the axis center line as the reference.
[0023] Preferably, adjacent arc surfaces are connected by smooth transition arcs. Such a structural design can ensure that there is sufficient wall thickness between the arc surface and the inner hole of the input shaft, thereby ensuring the rigidity of the steering connection.
[0024] Preferably, the contour of the arc surface is 0.05 mm, and the central angles of the three arc surfaces are 120 degrees and evenly distributed. Such a structural design can further improve the rigidity of the arc triangle 4 and increase the gap between the arc triangle 4 and the steering gear concave hole 5.
[0025] Preferably, the R angles of the three arc surfaces are all 25 mm.
[0026] Preferably, the arc R angle formed between adjacent arc surfaces is 2.5 mm.
[0027] The working principle of this embodiment is:
[0028] The steering input shaft in the automobile electric power steering system of the present solution is essentially a cylindrical rotating body structure, and the arc triangle 4 is connected with the steering gear recess 5 matched therewith, so that the input shaft body 1 can turn smoothly in the steering gear recess 5 and there is enough gap to ensure normal rotation. At the same time, arc transitions are used between the three arc surfaces to ensure the rigidity of the steering connection; the automobile electric power steering machine steering input shaft of the present utility model adopts high-precision connection, which can further improve the high precision of assembly on the basis of existing assembly precision, and at the same time make assembly easier and make the steering input shaft of the automobile turn more smoothly.
[0029] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the relevant technical field without departing from the spirit and technical ideas disclosed in the present invention shall still be covered by the claims of the present invention.
Claims
1. A steering input shaft in an automotive electric power steering system, characterized in that: The invention comprises an input shaft body (1), the input shaft body (1) comprising a large end (2), a small end (3) and a steering gear concave hole (5), an arc triangle (4) is provided at the large end (2) of the input shaft body (1), the arc triangle (4) is provided with three side surfaces, and the three side surfaces are all arc curved surfaces, the three arc curved surfaces are evenly distributed with the axis center line as the reference, and the steering gear concave hole (5) is butted with the arc triangle (4).
2. A steering input shaft in an automotive electric power steering system according to claim 1, characterized in that: Adjacent arc surfaces are connected by smooth transition arcs.
3. A steering input shaft in an automotive electric power steering system according to claim 1, characterized in that: The contour of the arc surface is 0.05 mm, and the central angles of the three arc surfaces are 120 degrees and evenly distributed.
4. A steering input shaft in an automotive electric power steering system according to claim 1, characterized in that: The R angles of the three arc surfaces are all 25 mm.
5. A steering input shaft in an automotive electric power steering system according to claim 2, characterized in that: The arc R angle formed between adjacent arc surfaces is 2.5 mm.