Limiting device for telescopic adjustment of electric adjustment steering column

Abstract

The utility model discloses a limiting device for telescopic adjustment of an electric adjusting steering column, which comprises a steering inner tube, a steering outer tube is coaxially arranged on the outer side of the steering inner tube, and a connecting support capable of sliding along the axial direction is mounted on the steering outer tube. The connecting support axially moves to drive the steering inner pipe to axially move relative to the steering outer pipe, the connecting support is connected with a telescopic adjusting motor installed on the outer side of the steering outer pipe, and the steering outer pipe is provided with a long-strip-shaped limiting hole formed in the axial direction of the steering inner pipe. A guide piece embedded into the long-strip-shaped limiting hole is installed and connected to the connecting support, and when the connecting support moves in the axial direction of the steering inner pipe, the guide piece moves along the long-strip-shaped limiting hole. The electric adjusting steering column can solve the problems that an inner pipe and an outer pipe of an existing electric adjusting steering column are prone to abrasion, and a gap is prone to occurring.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile electric power steering systems, in particular to a limiting device for electrically adjusting the telescopic adjustment of a steering column. Background Art

[0002] Electric Power Steering (EPS) is a power steering system that relies on an electric motor to provide assist torque. The telescopic adjustment of an electrically adjustable steering column differs from that of a manually adjustable steering column. A manually adjustable steering column relies on manual manual adjustment along the column tube axis, without any drive in other directions. However, the telescopic adjustment of an electrically adjustable steering column relies on a DC motor to drive the inner steering tube to slide back and forth within the outer steering tube. Because the motor drive shaft and the inner steering tube sliding axis are not coaxial, the inner steering tube is subject to push-pull forces from the drive shaft to the sliding axis and push-pull forces along the column tube axis during movement. Prolonged adjustment can cause the connecting bracket to wobble, leading to severe wear and play between the inner and outer steering tubes. This, in turn, reduces the column's natural frequency, stiffness, and adjustment retention requirements, impacting driving comfort and safety. Utility Model Content

[0003] The utility model provides a limiting device for telescopic adjustment of an electrically adjustable steering column, which can solve the problem of easy wear and gap between the inner tube and the outer tube of the existing electrically adjustable steering column.

[0004] To achieve the above-mentioned objectives, the utility model provides the following technical solutions: a limit device for telescopic adjustment of an electrically adjustable steering column, comprising a steering inner tube, a steering outer tube being coaxially arranged on the outer side of the steering inner tube, a connecting bracket which can slide in the axial direction being installed on the steering outer tube, the axial movement of the connecting bracket driving the steering inner tube to move axially relative to the steering outer tube, the connecting bracket being connected to a telescopic adjustment motor installed on the outer side of the steering outer tube, the steering outer tube being provided with an elongated limiting hole arranged along the axial direction of the steering inner tube, the connecting bracket being provided with a guide piece embedded in the elongated limiting hole, when the connecting bracket moves along the axial direction of the steering inner tube, the guide piece moves along the elongated limiting hole by providing the elongated limiting hole and the guide piece connected to the connecting bracket, the position of the connecting bracket and the steering inner tube can be limited when they move axially, when the connecting bracket is pre-loose, it cannot be displaced in the Y direction, so that it cannot shake, thereby ensuring the stable movement of the steering inner tube in the steering outer tube.

[0005] Preferably, the connecting bracket has an extension plate extending toward the elongated limiting hole, and the guide member is installed at the end of the extension plate. The positions of the elongated limiting hole and the connecting bracket can be flexibly set through the extension plate, and the space occupied by the connecting bracket is also relatively small.

[0006] Preferably, the guide member includes a limiting sleeve and a screw for fixing the limiting sleeve. The outer diameter of the limiting sleeve is consistent with the width of the elongated limiting hole. The screw can quickly fix and replace the limiting sleeve, and the limiting sleeve can play a better guiding role.

[0007] Preferably, the limiting sleeve is made of polyformaldehyde material to reduce wear and resistance between the limiting sleeve and the elongated limiting hole.

[0008] Preferably, a crush strip is provided on the outer side of the steering inner tube along the axial direction, a crush bracket is installed on the outer side of the crush strip, the connecting bracket is connected to the crush bracket, and the connecting bracket is connected to the steering inner tube through a crush structure, and the structure is compact.

[0009] Preferably, the length of the elongated limiting hole is equal to the collapse distance of the steering inner tube.

[0010] Preferably, a folded edge portion is provided at one end of the crush bracket, and the folded edge portion is embedded in a limiting groove on the connecting bracket. The crush bracket and the connecting bracket are also connected by a rivet located on one side of the folded edge portion. The connecting line between the rivet and the folded edge portion is parallel to the axial direction of the steering inner tube. The folded edge portion and the rivet form a two-point connection, which can reduce the swing of the connecting bracket when it moves, and the folded edge portion facilitates the installation and positioning of the connecting bracket.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] The structure is simple. By setting a long strip limit hole and a guide piece connected to the connecting bracket, the position of the connecting bracket and the steering inner tube can be limited when they move axially. When the connecting bracket is pre-loose, it cannot be displaced in the Y direction, so it cannot shake, thereby ensuring the stable movement of the steering inner tube in the steering outer tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structural diagram of the utility model;

[0014] Figure 2 It is a three-dimensional explosion diagram of the utility model;

[0015] Figure 3 It is a schematic sectional view of the main view of the present invention.

[0016] Reference numerals:

[0017] 1. Steering inner tube, 11. Folding part, 12. Rivet, 2. Steering outer tube, 3. Connecting bracket, 4. Long strip limiting hole, 5. Screw, 6. Limiting sleeve, 7. Crush strip, 8. Crush bracket, 9. Extension plate, 10. Guide. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0019] like Figure 1-3 As shown, the utility model solves the problem of easy wear and gap between the inner tube and the outer tube of the existing electric adjustable steering column. The following technical solution is provided: a limit device for electrically adjusting the telescopic adjustment of a steering column, comprising a steering inner tube 1, a steering outer tube 2 coaxially arranged on the outer side of the steering inner tube 1, a connecting bracket 3 slidable in the axial direction mounted on the steering outer tube 2, the axial movement of the connecting bracket 3 drives the steering inner tube 1 to move axially relative to the steering outer tube 2, the connecting bracket 3 is connected to a telescopic adjustment motor mounted on the outer side of the steering outer tube 2, the steering outer tube 2 is provided with an elongated limit hole 4 arranged along the axial direction of the steering inner tube 1, the connecting bracket 3 is mounted and connected to a guide member 10 embedded in the elongated limit hole 4, when the connecting bracket 3 moves along the axial direction of the steering inner tube 1, the guide member 10 moves along the elongated limit hole 4, by providing the elongated limit hole 4 and the guide member 10 connected to the connecting bracket 3, the position of the connecting bracket 3 and the steering inner tube 1 can be limited during axial movement, when the connecting bracket 3 is pre-loose, it cannot move in the Y direction, so it cannot shake, thereby ensuring the stable movement of the steering inner tube 1 in the steering outer tube 2.

[0020] Specifically, the steering outer tube 2 has a slotted side, into which the connecting bracket 3 is mounted. The elongated stopper hole 4 and the center of the connecting bracket 3 are aligned horizontally, parallel to the axis of the steering inner tube 1. A telescopic adjustment motor is mounted on the steering outer tube 2. Rotation of the motor's main shaft drives a screw, which in turn drives axial movement of the connecting bracket 3, achieving electric adjustment. The length of the elongated stopper hole 4 is equal to the required collapsing distance of the steering column and greater than the telescopic adjustment range. Interference does not occur during normal telescopic adjustment.

[0021] In this embodiment, the connecting bracket 3 has an extension plate 9 extending toward the elongated limiting hole 4, and the guide member 10 is installed at the end of the extension plate 9. The positions of the elongated limiting hole 4 and the connecting bracket 3 can be flexibly set through the extension plate 9. The space occupied by the connecting bracket 3 is also relatively small. The extension plate 9 is elongated, and the center line of the extension plate 9 coincides with the center line of the elongated limiting hole 4.

[0022] In this embodiment, if Figure 1-2 As shown, the guide member 10 includes a limiting sleeve 6 and a screw 5 for fixing the limiting sleeve 6. The outer diameter of the limiting sleeve 6 is consistent with the width of the elongated limiting hole 4. The screw 5 can quickly fix and replace the limiting sleeve 6, and the limiting sleeve 6 can play a relatively good guiding role. The limiting sleeve 6 is made of polyoxymethylene material to reduce wear and resistance between the limiting sleeve 6 and the elongated limiting hole 4.

[0023] like Figure 1-3 As shown, a crush strip 7 is axially arranged on the outer side of the steering inner tube 1, and a crush bracket 8 is installed on the outer side of the crush strip 7. The connecting bracket 3 is connected to the crush bracket 8, and the connecting bracket 3 is connected to the steering inner tube 1 through a crush structure. The structure is compact. When the steering wheel at one end of the steering inner tube 1 collides with the human body, the steering inner tube 1 will collapse inward. There is an interference fit between the crush strip 7 and the crush bracket 8. The inward collapse of the steering inner tube 1 is axial movement, and deformation will occur between the crush strip 7 and the crush bracket 8.

[0024] In this embodiment, if Figure 1 As shown, a folded edge portion 11 is provided at one end of the crush bracket 8, and the folded edge portion 11 is embedded in the limiting groove on the connecting bracket 3. The crush bracket 8 and the connecting bracket 3 are also connected by a rivet 12 located on one side of the folded edge portion 11. The connecting line between the rivet 12 and the folded edge portion 11 is parallel to the axial direction of the steering inner tube 1. The folded edge portion 11 and the rivet 12 form a two-point connection, which can reduce the swing of the connecting bracket 3 when it moves. The folded edge portion 11 facilitates the installation and positioning of the connecting bracket 3.

[0025] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] In addition, the terms "first," "second," and so on, used in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0027] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0028] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. 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 this utility model.

Claims

1. A limit device for electrically adjusting the telescopic adjustment of a steering column, comprising: A steering inner tube (1), a steering outer tube (2) is coaxially arranged on the outer side of the steering inner tube (1), a connecting bracket (3) that can slide along the axial direction is installed on the steering outer tube (2), the axial movement of the connecting bracket (3) drives the steering inner tube (1) to move axially relative to the steering outer tube (2), the connecting bracket (3) is connected to a telescopic adjustment motor installed on the outer side of the steering outer tube (2), and is characterized in that the steering outer tube (2) is provided with an elongated limiting hole (4) arranged along the axial direction of the steering inner tube (1), the connecting bracket (3) is installed and connected with a guide member (10) embedded in the elongated limiting hole (4), and when the connecting bracket (3) moves along the axial direction of the steering inner tube (1), the guide member (10) moves along the elongated limiting hole (4).

2. The electric steering column telescopic adjustment limiter according to claim 1, characterized in that: The connecting bracket (3) has an extension plate (9) extending in the direction of the long strip limiting hole (4), and the guide member (10) is installed at the end of the extension plate (9).

3. The electric steering column telescopic adjustment limiter according to claim 1, characterized in that: The guide member (10) comprises a limiting sleeve (6) and a screw (5) for fixing the limiting sleeve (6). The outer diameter of the limiting sleeve (6) is consistent with the width of the long strip limiting hole (4).

4. The electric steering column telescopic adjustment limiter according to claim 3, characterized in that: The limiting sleeve (6) is made of polyformaldehyde material.

5. The electric steering column telescopic adjustment limiter according to claim 1, characterized in that: A collapse strip (7) is axially arranged on the outer side of the steering inner tube (1), a collapse bracket (8) is installed on the outer side of the collapse strip (7), and the connecting bracket (3) is connected to the collapse bracket (8).

6. The electric steering column telescopic adjustment limiter according to claim 5, characterized in that: The length of the long strip-shaped limiting hole (4) is equidistant from the collapse distance of the steering inner tube (1).

7. The electric steering column telescopic adjustment limiter according to claim 5, characterized in that: One end of the collapse bracket (8) is provided with a folded edge portion (11), and the folded edge portion (11) is embedded in a limiting groove on the connecting bracket (3). The collapse bracket (8) and the connecting bracket (3) are also connected via a rivet (12) located on one side of the folded edge portion (11), and the connecting line between the rivet (12) and the folded edge portion (11) is parallel to the axial direction of the steering inner tube (1).

Images