Gear shaft for automotive steering system

Abstract

The utility model provides a gear shaft for car steering system, including gear shaft main part, the upper end of gear shaft main part is provided with the sunken groove of waist type state, and the sunken groove is used for the convex part of waist type state on input shaft inserts and is connected with input shaft transmission, the inside embedding of sunken groove is the annular insert of making by nylon material, the contour shape of annular insert is compatible with the contour shape of sunken groove inboard wall, the outer periphery wall of annular insert is close to the inner periphery wall of sunken groove, the contour shape of annular insert is compatible with the contour shape of convex part, the inner chamber of annular insert is used for convex part inserts and is close to convex part, the utility model discloses through the setting of annular insert, and annular insert can be close to sunken groove and convex part all and eliminate the assembly gap between convex part and sunken groove, thereby can avoid the transmission abnormal sound between convex part and sunken groove because of existing assembly gap.

Description

Technical Field

[0001] This utility model relates to the technical field of automotive steering system components, and more specifically, to a gear shaft for automotive steering systems. Background Technology

[0002] The gear shaft is an important transmission component in the automotive steering system. During use, it is rotatably connected to the housing of the steering system. One end of the gear shaft is connected to the input shaft, and the other end is rotatably connected to the housing. Furthermore, the gear portion on the gear shaft meshes with the gear portion on the output shaft. In the prior art, the gear shaft includes a gear shaft body. The upper end of the gear shaft body has a waist-shaped recess for a waist-shaped protrusion located on the input shaft to insert into and drive through the input shaft. However, since both the gear shaft and the input shaft are metal components, and after the protrusion on the input shaft engages with the recess at one end of the gear shaft, an assembly gap exists between the protrusion and the recess. Therefore, when the input shaft drives the gear shaft to rotate, this assembly gap causes abnormal transmission noise, which affects the reliability of the automotive steering system. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a gear shaft for an automotive steering system. By setting an annular insert, the annular insert can fit tightly with both the groove and the protrusion and eliminate the assembly gap between the protrusion and the groove, thereby avoiding abnormal transmission noise caused by the assembly gap between the protrusion and the groove.

[0004] This utility model provides a gear shaft for an automotive steering system, including a gear shaft body; the upper end of the gear shaft body is provided with a waist-shaped groove, which is used for inserting a waist-shaped protrusion located on the input shaft and drivingly connecting it to the input shaft; an annular insert made of nylon material is embedded inside the groove; the outer contour shape of the annular insert is adapted to the contour shape of the inner sidewall of the groove, the outer peripheral wall of the annular insert is in close contact with the inner peripheral wall of the groove, the inner contour shape of the annular insert is adapted to the outer contour shape of the protrusion, and the inner cavity of the annular insert is used for inserting the protrusion and tightly fitting the protrusion.

[0005] This invention utilizes an annular insert, made of nylon material, to provide it with a certain degree of deformation capability. This allows the annular insert to fit tightly with both the groove and the protrusion after insertion, eliminating any assembly gap between them. Consequently, when the input shaft drives the gear shaft to rotate, it prevents transmission noise caused by assembly gaps between the protrusion and the groove, thus ensuring the reliability of the automotive steering system.

[0006] In one possible implementation, a foolproof insert is provided on the inner wall of the annular insert, which is used to engage with a foolproof slot located on the outer wall of the protrusion. With this structure, under the action of the foolproof insert, the foolproof insert can engage with the foolproof slot located on the outer wall of the protrusion, thereby realizing the foolproof engagement of the protrusion with the annular insert and the groove, and thus realizing the foolproof connection between the gear shaft body and the input shaft.

[0007] In one possible implementation, the foolproof insert is wedge-shaped, and the shape of the foolproof slot is adapted to the shape of the foolproof insert; by adopting this structure, the foolproof insert can be more easily inserted into the foolproof slot located on the protrusion during the process of mating and interlocking between the protrusion and the annular insert.

[0008] In one possible implementation, an annular buckle is provided on the outer wall of the upper end of the annular insert, and an annular groove is provided on the inner wall of the recess. The annular buckle and the annular groove are engaged to fasten each other. With this structure, after the annular insert is embedded in the recess, the annular buckle can engage with the annular groove to fasten the annular insert to the gear shaft body, thereby achieving the fastening of the annular insert to the gear shaft body and preventing the annular insert from detaching from the gear shaft body.

[0009] In one possible implementation, a first annular chamfered surface is provided on the inner wall of the upper end of the sink. The first annular chamfered surface is used to cooperate with the outer wall of the annular insert for guidance so that the annular insert can be inserted into the sink. By providing the first annular chamfered surface on the inner wall of the upper end of the sink, when the annular insert is inserted into the sink, the first annular chamfered surface can cooperate with the outer wall of the annular insert for guidance so that the annular insert can be inserted into the sink, thus facilitating the insertion of the annular insert into the sink.

[0010] In one possible implementation, a second annular chamfered surface is provided on the inner wall of the upper end of the annular insert. The second annular chamfered surface is used to cooperate with the outer wall of the protrusion for guidance so that the protrusion can be inserted into the annular insert. By providing a second annular chamfered surface on the inner wall of the upper end of the annular insert, the protrusion can cooperate with the second annular chamfered surface for guidance during the process of inserting the protrusion into the annular insert, which facilitates the mating and insertion of the protrusion and the annular insert.

[0011] In one possible implementation, a light shaft portion with an outer diameter smaller than that of the gear shaft body is coaxially provided at the lower end of the gear shaft body. The light shaft portion is used to engage with and rotate with a shaft hole located on the inner wall of the housing in the automotive steering system. An annular boss is provided on the outer end of the light shaft portion, which abuts against the inner end of the shaft hole. With this structure, after the light shaft portion is inserted into the shaft hole located on the inner wall of the housing, the annular boss can abut against the inner end of the shaft hole and rotate with the shaft hole, thereby reducing the contact area between the end of the light shaft portion and the inner end of the shaft hole. This reduces the rotational friction between the gear shaft body and the housing in the automotive steering system, making the rotation of the gear shaft body relative to the housing in the automotive steering system smoother. Attached Figure Description

[0012] Figure 1 A schematic diagram of the three-dimensional structure after the annular insert is assembled with the gear shaft body; Figure 2 This is a three-dimensional structural diagram of the gear shaft body; Figure 3 for Figure 2 A magnified structural diagram of point A in the middle; Figure 4 This is a cross-sectional view of the annular insert after it has been assembled with the gear shaft body. Figure 5 for Figure 4 A magnified structural diagram of section B. Detailed Implementation

[0013] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0014] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0015] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0016] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] See Figures 1-5 As shown in the figure, this application discloses a gear shaft for an automotive steering system, including a gear shaft body 1; the upper end of the gear shaft body 1 is provided with a waist-shaped groove 11, the groove 11 is used for inserting a waist-shaped protrusion located on the input shaft and drivingly connecting it to the input shaft; an annular insert 2 made of nylon material is embedded inside the groove 11; the outer contour shape of the annular insert 2 is adapted to the contour shape of the inner sidewall of the groove 11, the outer peripheral wall of the annular insert 2 is in close contact with the inner peripheral wall of the groove 11, the inner contour shape of the annular insert 2 is adapted to the outer contour shape of the protrusion, and the inner cavity of the annular insert 2 is used for inserting the protrusion and tightly fitting the protrusion.

[0018] An anti-fooling plug 21 is provided on the inner wall of the annular insert 2. The anti-fooling plug 21 is used to engage with the anti-fooling slot located on the outer wall of the protrusion. With this structure, the anti-fooling plug can engage with the anti-fooling slot located on the outer wall of the protrusion, thereby realizing the anti-fooling connection between the protrusion, the annular insert, and the groove, and thus realizing the anti-fooling connection between the gear shaft body and the input shaft.

[0019] The foolproof insert 21 is wedge-shaped, and the shape of the foolproof slot is adapted to the shape of the foolproof insert 21. With this structure, the foolproof insert can be more easily inserted into the foolproof slot located on the protrusion during the process of mating and interlocking between the protrusion and the annular insert.

[0020] An annular buckle 22 is provided on the outer wall of the upper end of the annular insert 2, and an annular groove 12 is provided on the inner wall of the recess 11. The annular buckle 22 and the annular groove 12 are engaged and fastened. With this structure, after the annular insert is embedded in the recess, the annular buckle can engage and fasten with the annular groove, thereby achieving the fastening of the annular insert and the gear shaft body, that is, preventing the annular insert from detaching from the gear shaft body.

[0021] A first annular chamfered surface 13 is provided on the inner wall of the upper end of the sink 11. The first annular chamfered surface 13 is used to cooperate with the outer wall of the annular insert 2 for guidance so that the annular insert 2 can be inserted into the sink 11. After the first annular chamfered surface is provided on the inner wall of the upper end of the sink, when the annular insert is inserted into the sink, the first annular chamfered surface can cooperate with the outer wall of the annular insert for guidance so that the annular insert can be inserted into the sink, which can facilitate the insertion of the annular insert into the sink.

[0022] A second annular chamfered surface 23 is provided on the inner wall of the upper end of the annular insert 2. The second annular chamfered surface 23 is used to cooperate with the outer wall of the protrusion for guidance so that the protrusion can be inserted into the annular insert 2. After the second annular chamfered surface is provided on the inner wall of the upper end of the annular insert, the protrusion can cooperate with the second annular chamfered surface for guidance during the process of the protrusion being inserted into the annular insert, which can facilitate the mating and insertion of the protrusion and the annular insert.

[0023] The lower end of the gear shaft body 1 is coaxially provided with a light shaft portion 14, the outer diameter of which is smaller than that of the gear shaft body 1. The light shaft portion 14 is used to engage with and rotate with a shaft hole located on the inner wall of the housing in the automotive steering system. An annular boss 15 is provided on the outer end of the light shaft portion 14. The annular boss 15 is used to abut against the inner end of the shaft hole. With this structure, after the light shaft portion is inserted into the shaft hole located on the inner wall of the housing, the annular boss can abut against the inner end of the shaft hole and rotate with the shaft hole, thereby reducing the contact area between the end of the light shaft portion and the inner end of the shaft hole. This reduces the rotational friction between the gear shaft body and the housing in the automotive steering system, making the rotation of the gear shaft body relative to the housing in the automotive steering system smoother.

[0024] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A gear shaft for an automotive steering system, comprising a gear shaft body (1); the upper end of the gear shaft body (1) is provided with a waist-shaped recess (11), the recess (11) being used for inserting a waist-shaped protrusion located on an input shaft and drivingly connecting it to the input shaft; characterized in that: The sink (11) is fitted with an annular insert (2) made of nylon material; the outer contour shape of the annular insert (2) is adapted to the contour shape of the inner sidewall of the sink (11), the outer peripheral wall of the annular insert (2) is in close contact with the inner peripheral wall of the sink (11), the inner contour shape of the annular insert (2) is adapted to the outer contour shape of the protrusion, and the inner cavity of the annular insert (2) is used for the protrusion to be inserted and to fit tightly with the protrusion.

2. The gear shaft for an automotive steering system according to claim 1, characterized in that: An anti-fooling plug (21) is provided on the inner wall of the annular insert (2), and the anti-fooling plug (21) is used to engage with the anti-fooling slot located on the outer wall of the protrusion.

3. The gear shaft for an automotive steering system according to claim 2, characterized in that: The foolproof plug (21) is wedge-shaped, and the shape of the foolproof slot is adapted to the shape of the foolproof plug (21).

4. The gear shaft for an automotive steering system according to any one of claims 1-3, characterized in that: The outer wall of the upper end of the annular insert (2) is provided with an annular buckle (22), and the inner wall of the recess (11) is provided with an annular buckle groove (12). The annular buckle (22) and the annular buckle groove (12) are engaged and fastened together.

5. The gear shaft for an automotive steering system according to claim 4, characterized in that: The inner wall at the upper end of the sink (11) is provided with a first annular chamfered surface (13), which is used to cooperate with the outer wall of the annular insert (2) for guidance so that the annular insert (2) can be inserted into the sink (11).

6. The gear shaft for an automotive steering system according to any one of claims 1-3 or 5, characterized in that: The inner wall of the upper end of the annular insert (2) is provided with a second annular chamfered surface (23), which is used to cooperate with the outer wall of the protrusion for guidance so that the protrusion can be inserted into the annular insert (2).

7. The gear shaft for an automotive steering system according to any one of claims 1-3 or 5, characterized in that: The lower end of the gear shaft body (1) is coaxially provided with a light shaft part (14) with an outer diameter smaller than that of the gear shaft body (1). The light shaft part (14) is used to engage with and rotate with the shaft hole on the inner wall of the housing in the automotive steering system. An annular boss (15) is provided on the outer end of the light shaft part (14). The annular boss (15) is used to abut against the inner end of the shaft hole.

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