Steering column locking structure with cam sleeve

Abstract

The utility model discloses a steering column locking structure with a cam sleeve, and belongs to the technical field of automobile steering columns. The device comprises a fixed support and an outer sleeve fixed on the fixed support, an inner sleeve is arranged in the outer sleeve, the inner sleeve can axially move relative to the outer sleeve, a bolt shaft penetrates through the fixed support, and the end of the bolt shaft is connected with a handle. A cam sleeve is arranged outside the bolt shaft in a matched mode, the middle of the cam sleeve protrudes and stretches into the outer sleeve and is matched with the outer surface of the inner sleeve through an acting face, and the acting face of the cam sleeve is designed to be of an Archimedes spiral line. According to the utility model, a high-precision and high-reliability telescopic direction locking function can be realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of automobile steering column, and specifically relates to a steering column locking structure with cam sleeve. BACKGROUND

[0002] In the steering column assembly of an automobile, the locking mechanism is a key structure for locking the inclination angle and the telescopic direction of the steering column. The traditional locking device usually adopts a cam and a nut clamping support to lock the inner shaft sleeve, but the inner shaft sleeve has poor telescopic direction locking and is prone to shaking. SUMMARY

[0003] The utility model is just in view of the above problem, make up the deficiency of prior art, provide a kind of steering column locking structure with cam sleeve;The utility model can realize the telescopic direction locking function of high precision, high reliability.

[0004] To achieve the above object, the utility model adopts the following technical scheme.

[0005] The utility model provides a kind of steering column locking structure with cam sleeve, including fixed support and the outer sleeve tube of being fixed on the fixed support, the inner sleeve tube is arranged in the outer sleeve tube, the inner sleeve tube can be axially moved relative to the outer sleeve tube, the bolt shaft is set through the fixed support, the end of the bolt shaft is connected with handle, it is characterized by, the cam sleeve is matched and is set outside the bolt shaft, the middle part of the cam sleeve protrudes into the outer sleeve tube and is matched with the outer surface of the inner sleeve tube by acting surface, the acting surface of the cam sleeve adopts Archimedes spiral line design.

[0006] Further, the inner cavity of the cam sleeve is provided with an internal spline, and an external spline is matched and arranged on the bolt shaft, the internal spline of the cam sleeve is provided with a missing tooth, and the bolt shaft is matched and arranged with a missing tooth, the bolt shaft and the cam sleeve are matched by the spline structure and the missing tooth, so that the cam sleeve can be rotated along the center line of the bolt shaft under the driving of the bolt shaft.

[0007] Further, the acting surface of the cam sleeve is provided with an annular groove, and the diameter of the annular groove is matched with the inner sleeve tube.

[0008] The utility model has the beneficial effects.

[0009] The utility model realizes the accurate displacement control by the geometric characteristics of Archimedes spiral line, prevents the device from being unlocked by the friction force of the cam sleeve, has simple structure and high reliability, and realizes the locking function of high precision and high reliability. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to make the technical problems, technical schemes and beneficial effects solved by the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and not used to limit the utility model.

[0011] Figure 1 is a cross-sectional structure schematic diagram of the utility model.

[0012] Figure 2 is a cross-sectional structure schematic diagram of the cam sleeve of the utility model.

[0013] Figure 3 is a cross-sectional structure schematic diagram of the utility model Figure 2 .

[0014] Figure 4 is a structure schematic diagram of the bolt shaft of the utility model.

[0015] Marked in the figure: 1 is a fixed support, 2 is an outer sleeve, 3 is an inner sleeve, 4 is a bolt shaft, 5 is a handle, 6 is a cam sleeve, 7 is an acting surface, 8 is an inner spline, 9 is an outer spline, 10 is a missing tooth, 11 is an annular groove. Specific embodiments

[0016] In combination with the drawings shown, the present embodiment provides a steering column locking structure with a cam sleeve, which comprises a fixed support 1 and an outer sleeve 2 fixed on the fixed support 1, the inner sleeve 3 is arranged inside the outer sleeve 2, the inner sleeve 3 can move axially relative to the outer sleeve 2, the bolt shaft 4 is arranged through the fixed support 1, the end of the bolt shaft 4 is connected with the handle 5, and the cam sleeve 6 is arranged in cooperation with the outside of the bolt shaft 4. The outer sleeve 2 is welded with the fixed support 1, and is used as a whole to support and fix the cam sleeve 6 and the bolt shaft 4, so as to ensure the stability of the structure, and the handle 5 is used to drive the bolt shaft 4 to rotate.

[0017] The inner cavity of the cam sleeve 6 is provided with the inner spline 8, the outer spline 9 is arranged in cooperation on the bolt shaft 4, the missing tooth 10 is arranged on the inner spline 8 of the cam sleeve 6, and the missing tooth 10 is arranged in cooperation on the bolt shaft 4. The bolt shaft 4 and the cam sleeve 6 are matched through the spline structure and the missing tooth 10, so that the cam sleeve 6 can rotate along the center line of the bolt shaft 4 under the driving of the bolt shaft 4.

[0018] The middle part of the cam sleeve 6 protrudes into the outer sleeve 2 and is matched with the outer surface of the inner sleeve 3 through the acting surface 7, the acting surface 7 of the cam sleeve 6 adopts an Archimedes spiral design, the Archimedes spiral has equidistance and self-locking properties, and can realize high-precision linear displacement control. Therefore, the cam sleeve 6 based on the Archimedes spiral principle is applied to the steering column and is used for locking in the extension direction of the steering column, which is a simple and reliable locking mechanism.

[0019] The acting surface 7 of the cam sleeve 6 is provided with an annular groove 11, the diameter of which is matched with the inner sleeve 3, so as to increase the contact area of the cam sleeve 6 and the inner sleeve 3, increase the friction, and prevent the device from being unlocked automatically.

[0020] After the handle 5 drives the bolt shaft 4 to rotate, the bolt shaft 4 drives the cam sleeve 6 to rotate, the cam sleeve 6 is matched with the inner sleeve 3 through the structure of the Archimedes spiral and the acting surface 7, so as to compress the inner sleeve 3, realize the locking of the inner sleeve 3, and the reverse rotation of the handle 5 can realize the unlocking of the inner sleeve 3.

[0021] It can be understood that the above specific description of the utility model is only used for illustrating the utility model and is not limited to the technical scheme described in the utility model embodiment, and the person skilled in the art should understand that the utility model can still be modified or replaced equivalently to achieve the same technical effect, as long as the use needs are met, which is within the protection scope of the utility model.

Claims

1. A steering column locking structure with a cam sleeve, comprising a fixed support (1) and a outer sleeve (2) fixed on the fixed support (1), an inner sleeve (3) is arranged inside the outer sleeve (2), the inner sleeve (3) can move axially relative to the outer sleeve (2), a bolt shaft (4) is arranged through the fixed support (1), an end of the bolt shaft (4) is connected with a handle (5), characterized in that, The bolt shaft (4) is externally matched with a cam sleeve (6), the middle of the cam sleeve (6) protrudes into the outer sleeve (2) and is matched with the outer surface of the inner sleeve (3) through an acting surface (7), and the acting surface (7) of the cam sleeve (6) is designed as an Archimedes spiral.

2. The steering column lock structure with a cam sleeve according to claim 1, characterized in that An inner spline (8) is arranged in the inner cavity of the cam sleeve (6), an outer spline (9) is arranged on the bolt shaft (4) in a matched mode, a missing tooth (10) is arranged on the inner spline (8) of the cam sleeve (6), and a missing tooth (10) is arranged on the bolt shaft (4) in a matched mode; the bolt shaft (4) and the cam sleeve (6) are matched through the spline structure and the missing tooth (10), so that the cam sleeve (6) can rotate along the center line of the bolt shaft (4) under the driving of the bolt shaft (4).

3. The steering column lock structure with a cam sleeve according to claim 1, wherein The acting surface (7) of the cam sleeve (6) is provided with an annular groove (11), and the diameter of the annular groove (11) is matched with the inner sleeve (3).

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