Limiting crumple device for electrically adjusting steering column

Abstract

The utility model discloses a limiting collapsing device of an electric adjusting steering column, which comprises a column inner tube, a column outer tube coaxially arranged on the outer side of the column inner tube, a telescopic motor mounted outside the column outer tube, a connecting support connected to the outer side of the column inner tube, a collapsing slider mounted at one end of the connecting support and connected with the column inner tube, and a collapsing slider mounted at the other end of the connecting support and connected with the column inner tube. A collapsing steel belt is arranged on one side of the collapsing sliding block in a wound mode, the collapsing steel belt is connected with a lead screw nut on the telescopic motor at the same time, axial limiting grooves are symmetrically formed in the positions, located on the two sides of the connecting support, of the tubular column outer tube, limiting sliding blocks are arranged in the axial limiting grooves, and at least one limiting screw is connected between the limiting sliding blocks on the two sides. And the limiting screw rod transversely penetrates through the collapsing steel belt, the collapsing sliding block and the screw rod nut. The electric adjusting steering column can solve the problems that in the telescopic adjusting process of an existing electric adjusting steering column, a column inner pipe and a column outer pipe are seriously abraded, and a gap exists.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile electric power steering system, concretely is a kind of electric adjustment steering column's limiting collapse device. BACKGROUND

[0002] At present, electric adjustment steering column is different from the form of telescopic adjustment of manual adjustment steering column in telescopic adjustment. Manual adjustment steering column is directly adjusted along the column tube axis by manpower, and there is no driving in other directions. The telescopic adjustment of electric adjustment steering column relies on DC motor to drive the inner tube of column to slide in the outer tube of column. Since the driving shaft of motor and the sliding shaft of column are not on the same axis, the inner tube of column is subjected to the push-pull force along the driving shaft to sliding shaft and the push-pull force along the column tube axis when moving.

[0003] During telescopic adjustment, the connecting bracket is shaken left and right for a long time due to the push-pull force along the driving shaft to sliding shaft and the push-pull force along the column tube axis, which causes serious wear and gap between the inner tube of column and the outer tube of column, and further reduces the inherent frequency, stiffness, adjustment holding force and other requirements of column, affecting the comfort and safety of automobile driving. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of electric adjustment steering column's limiting collapse device, can solve the problem that the inner tube of column and the outer tube of column are seriously worn and gap appears in the telescopic adjustment process of existing electric adjustment steering column.

[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of electric adjustment steering column's limiting collapse device, including the inner tube of column, the outer side of the inner tube of column is coaxially provided with the outer tube of column, the outer tube of column is installed with telescopic motor, the outer side of the inner tube of column is connected with the connecting bracket, one end of the connecting bracket is installed with the collapse slider connected with the inner tube of column, the side of the collapse slider is bypassed and provided with collapse steel band, the collapse steel band and collapse slider are matched by semicylindrical surface, when collapse slider moves towards the semicylindrical surface axial direction, make collapse steel band deformation, the collapse steel band is connected with the screw nut on telescopic motor simultaneously, the outer tube of column is provided with axial limit slot on the both sides of connecting bracket, the axial limit slot is provided with limit slider, at least one limit screw is connected between the limit slider of both sides, the limit screw is transversely passed from collapse steel band, collapse slider and screw nut, axial limit slot and limit slider can make the inner tube of column and the outer tube of column only be subjected to axial push, pull force in telescopic adjustment, static collapse test, dynamic collapse test process, improve the stability of steering column holding force, collapse force.

[0006] Preferably, a limiting bushing matching the shape of the axial limiting groove is embedded inside the axial limiting groove, and the limiting slider slides in the limiting bushing. The limiting bushing and the limiting slider are in clearance fit. The cooperation between the limiting bushing and the limiting slider can achieve a better guiding effect and reduce the generation of noise.

[0007] Preferably, a limiting step is provided on the inner side of the limiting bushing near the edge of the connecting bracket, and the limiting slider abuts against the limiting step to prevent the limiting slider from disengaging from the limiting bushing inward and to prevent the limiting slider from moving left or right.

[0008] Preferably, the connecting bracket is connected to the inner tube of the column by at least two shear rivets. When the inner tube of the column is subjected to impact and needs to collapse, the shear rivets can be cut to allow the inner tube of the column to move axially.

[0009] Preferably, the connecting bracket has a first connecting sidewall on both sides of its middle section, and the collapsible steel strip has a second connecting sidewall on both sides of its middle section. The lead screw nut is embedded inside the second connecting sidewall, and the limiting screw passes through the first connecting sidewall, the second connecting sidewall, and the lead screw nut. This securely connects the first connecting sidewall, the second connecting sidewall, the lead screw nut, and the limiting screw into one unit, which helps to prevent shaking when adjusting the inner tube of the tubing column.

[0010] Preferably, the collapsible slider is connected to the inner tube of the tubing column by a fixing rivet. The collapsible slider is easy and reliable to install and will not detach from the inner tube of the tubing column, thus ensuring the stability of the collapsing.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] With a simple structure, the inner and outer tubes of the steering column are subjected to only axial pushing and pulling forces during telescopic adjustment, static collapse test, and dynamic collapse test by setting a limiting screw, axial limiting groove, and limiting slider. This reduces the degree of freedom of the lead screw nut and telescopic motor during static collapse test and dynamic collapse test, and ensures that the direction of force release is on the predetermined trajectory. This not only ensures the stability of the telescopic adjustment of the electric steering column, but also ensures the requirements of the natural frequency, stiffness, and adjustment holding force of the electric steering column. It realizes the functional requirements of the vehicle steering system to be stable and smooth, and improves driving comfort. Attached Figure Description

[0013] Fig. 1 This is a three-dimensional structural diagram of the present invention in its exploded state;

[0014] Fig. 2 This is a partial cross-sectional view of the present invention;

[0015] Fig. 3The partial sectional view structure of the utility model.

[0016] Reference signs:

[0017] 1, telescopic motor, 11, inner tube of pipe column, 12, fixed rivet, 13, second connecting side wall, 14, first connecting side wall, 15, axial limiting groove, 2, screw nut, 3, collapsing steel belt, 4, shearing rivet, 5, connecting support, 6, outer tube of pipe column, 7, collapsing slider, 8, limiting bushing, 9, limiting slider, 10, limiting screw. DETAILED DESCRIPTION

[0018] The technical scheme in the utility model embodiment will be clearly and completely described below with reference to the drawings in the utility model embodiments.

[0019] As Figs. 1-3 shown, the utility model discloses to solve the problem that the inner tube and the outer tube of the pipe column are seriously abraded and appear gap in the telescopic adjustment process of the existing electrically adjusted steering column. Provide the following technical scheme: a limiting collapsing device of electrically adjusted steering column, including the inner tube 11 of pipe column, the outer side of the inner tube 11 of pipe column is coaxially provided with the outer tube 6 of pipe column, the outer tube 6 of pipe column is installed with telescopic motor 1, the outer side of the inner tube 11 of pipe column is connected with connecting support 5, one end of connecting support 5 is installed with the collapsing slider 7 connected with the inner tube 11 of pipe column, one side of collapsing slider 7 is provided with collapsing steel belt 3, and the collapsing steel belt 3 and the collapsing slider 7 are matched through semicylindrical surface, when the collapsing slider 7 moves axially towards the semicylindrical surface, the collapsing steel belt 3 is deformed, the collapsing steel belt 3 is connected with the screw nut 2 on telescopic motor 1 simultaneously, the outer tube 6 of pipe column is provided with axial limiting groove 15 on both sides of connecting support 5 symmetrically, the axial limiting groove 15 is provided with limiting slider 9, and at least one limiting screw 10 is connected between the limiting slider 9 on both sides, the limiting screw 10 passes through the collapsing steel belt 3, the collapsing slider 7 and the screw nut 2 transversely, through the setting of axial limiting groove 15 and limiting slider 9, the inner tube of pipe column and the outer tube of pipe column can only bear axial pushing and pulling force in the telescopic adjustment, static collapsing test and dynamic collapsing test, and the stability of the steering column holding force and collapsing force is improved.

[0020] In the embodiment, as Figs. 1-2 shown, the inside of the axial limiting groove 15 is embedded with the limiting bushing 8 matched with the shape of the axial limiting groove 15, the limiting slider 9 slides in the limiting bushing 8, and the limiting bushing 8 and the limiting slider 9 are matched with clearance, the limiting bushing 8 and the limiting slider 9 can have better guiding effect, and the generation of noise is reduced.

[0021] Specifically, one end of the limiting screw 10 is threadedly connected with a limiting slider 9, so that the two ends of the limiting slider 9 can be moved towards each other by rotating the limiting screw 10. Meanwhile, the inner side of the limiting bushing 8 is provided with a limiting step near the edge connected with the support 5, the limiting slider 9 abuts against the limiting step, preventing the limiting slider 9 from moving inwards out of the limiting bushing 8 and preventing the limiting slider 9 from moving left and right. When the limiting sliders 9 move towards each other, the friction between the limiting slider 9 and the limiting bushing 8 can be adjusted.

[0022] The threaded part of the limiting screw 10 adopts a fine tooth external thread structure, and the length of the axial limiting groove 15 is equal to the collapse distance requirement of the steering column, and is greater than or equal to the telescopic adjustment range of the inner tube 11 of the steering column. In this way, interference problems will not occur during normal telescopic adjustment, and when the telescopic adjustment motor fails to block, the inner tube 11 of the steering column will only move to the collapse end distance, so as to prevent safety problems.

[0023] The support 5 and the inner tube 11 of the steering column are connected by at least two shear rivets 4, which can be sheared when the inner tube 11 of the steering column needs to collapse under impact, so as to move the inner tube 11 of the steering column axially.

[0024] The limiting slider 9 and the limiting bushing 8 can both be made of nylon material, so as to reduce the wear, resistance and noise between the limiting slider 9 and the limiting bushing 8 during telescopic adjustment.

[0025] As the telescopic adjustment working principle in this embodiment: the telescopic motor 1 is fixed on the outer tube 6 of the steering column, when the driver needs to adjust the telescopic motor 1, the spindle of the telescopic motor 1 is telescopic, driving the support 5 to move axially in the forward / backward direction, the support 5, the collapse steel belt 3, the screw nut 2 and the inner tube 11 of the steering column are rigidly connected, and then the telescopic adjustment of the inner tube 11 of the steering column in the outer tube of the steering column is realized.

[0026] Therefore, when the support 5 moves, the axial limiting groove 15 and the limiting slider 9 cooperate to slide, which axially fixes and radially supports the screw nut 2 and the screw 1 of the telescopic motor, and the length of the sliding groove of the axial limiting groove 15 and the outer tube 6 of the steering column can also be adjusted to hard limit the axial adjustment range of the telescopic motor 1.

[0027] During the static collapse test and dynamic collapse test, the collapse force F and the impact force F' are transmitted axially through the inner tube 11 of the steering column, the shear rivet 4 is sheared to drive the collapse slider 7 to collapse axially, and the collapse principle is that when the inner tube 11 of the steering column drives the collapse slider 7 to move axially towards the semi-cylindrical surface, the collapse slider 7 can cause the collapse steel belt 3 to deform, and this deformation resistance can offset the collapse force F and the impact force F' of the inner tube 11 of the steering column.

[0028] At the same time of collapsing, the screw nut 2 and the telescopic motor 1, the steering outer tube 6, the limiting bush 8 and the limiting sliding block 9 are still connected together through the limiting screw rod 10, so that the uniqueness of force transmission direction is ensured, the elastic deformation of the screw rod caused by the force transmission of the screw nut is minimized, the counterforce damaging the screw nut is generated, and the integrity of each part after the test is completed is maximized.

[0029] In order to ensure the stability of the connection of the limiting screw rod 10, as shown in the figure, the middle part of the connecting bracket 5 is provided with a first connecting side wall 14, the middle part of the collapsing steel belt 3 is provided with a second connecting side wall 13, the screw nut 2 is embedded into the inner side of the second connecting side wall 13, and the limiting screw rod 10 passes through the first connecting side wall 14, the second connecting side wall 13 and the screw nut 2, so that the first connecting side wall 14, the second connecting side wall 13, the screw nut 2 and the limiting screw rod 10 are firmly connected into an integral whole, and the shaking during the adjustment of the tubular column inner tube 11 is avoided. Figs. 1-2

[0030] In the embodiment, the collapsing sliding block 7 is connected with the tubular column inner tube 11 through the fixed rivet 12, the collapsing sliding block 7 is simple and reliable to install, and cannot be separated from the tubular column inner tube 11, so that the stability of collapsing is ensured.

[0031] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition and the like between the components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications also change accordingly.

[0032] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0033] In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixing" and the like should be understood in a broad sense, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. ​

[0034] In addition, the technical solutions of various embodiments of the utility model can be combined with each other, but must be based on that a person having ordinary skill in the art can realize, when the combination of technical solutions appears mutual contradiction or cannot be realized, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the utility model.

Claims

1. A power steering column limiting collapse device, comprising: a column inner tube (11), the outer side of the column inner tube (11) is coaxially provided with a column outer tube (6), the outer side of the column outer tube (6) is provided with a telescopic motor (1), characterized in that the outer side of the column inner tube (11) is connected with a connecting bracket (5), one end of the connecting bracket (5) is provided with a collapse slider (7) connected with the column inner tube (11), one side of the collapse slider (7) is provided with a collapse steel belt (3), the collapse steel belt (3) and the collapse slider (7) are matched through a semi-cylindrical surface, when the collapse slider (7) moves axially towards the semi-cylindrical surface, the collapse steel belt (3) is deformed, the collapse steel belt (3) is connected with a screw nut (2) on the telescopic motor (1), the column outer tube (6) is provided with an axial limiting groove (15) on both sides of the connecting bracket (5), the axial limiting groove (15) is provided with a limiting slider (9), at least one limiting screw (10) is connected between the limiting sliders (9) on both sides, the limiting screw (10) passes through the collapse steel belt (3), the collapse slider (7) and the screw nut (2) transversely.

2. The electric power steering column crash stop of claim 1, wherein: The inside of the axial limiting groove (15) is embedded with a limiting bushing (8) matched with the shape of the axial limiting groove (15), the limiting slider (9) slides in the limiting bushing (8).

3. A power adjustable steering column limit collapse device according to claim 2, wherein: The inner side of the limiting bushing (8) is provided with a limiting step near the edge of the connecting bracket (5), the limiting slider (9) abuts against the limiting step.

4. The electrically adjustable steering column limit collapse device of claim 1, wherein: The connecting bracket (5) and the column inner tube (11) are connected through at least two shear rivets (4).

5. The electrically adjustable steering column limit collapse device of claim 1, wherein: The middle part of the connecting bracket (5) is provided with a first connecting side wall (14) on both sides, the middle part of the collapse steel belt (3) is provided with a second connecting side wall (13) on both sides, the screw nut (2) is embedded in the inner side of the second connecting side wall (13), the limiting screw (10) passes through the first connecting side wall (14), the second connecting side wall (13) and the screw nut (2).

6. The electrically adjustable steering column limit collapse device of claim 1, wherein: The collapse slider (7) is connected with the column inner tube (11) through a fixed rivet (12).

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