Steering device for a vehicle

Abstract

The application discloses a steering device of a vehicle, which comprises a shell, a first shell cavity and a second shell cavity connected in the shell, two ends of the first shell cavity being open, the second shell cavity having an opening, a first limiting part and a second limiting part being arranged in the second shell cavity, the first limiting part being arranged on the side of the second limiting part away from the opening, a rack being movably arranged in the first shell cavity, a gear shaft being arranged in the second shell cavity and engaged with the rack, a bearing being sleeved on the gear shaft and abutting against the first limiting part, an expansion part abutting against the side of the bearing away from the first limiting part, and a tensioning part being arranged at least partially on the shell, the tensioning part driving the expansion part to expand and combine with the second limiting part when the tensioning part is in a first position, and the tensioning part driving the expansion part to separate from the second limiting part when the tensioning part is in a second position. The application does not need to arrange two shells to install the rack and the gear shaft, and the installation of the rack and the gear shaft can be realized through the integrated shell.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a steering device of a vehicle. BACKGROUND

[0002] The steering machine has been applied to the steering system of all modern cars. The steering machine applied by modern cars receives the steering movement and torque input by the steering column through the transmission shaft, pushes the wheel kingpin to rotate through the gear rack mechanism to realize the steering of the wheel, and can control the electric motor in parallel to provide electric power assistance to help the driver better control the steering of the vehicle. The main body shell of the electric power assisted steering machine is currently divided into two parts, namely the rack shell (also known as the main shell, main shell) and the power assistance shell (also known as the reduction mechanism shell, reduction shell), which requires two sets of molds during manufacturing, resulting in relatively high manufacturing and use costs. When assembling, threaded fasteners are used for connection, which also has a relatively high use cost. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a steering device of a vehicle, which can effectively solve the problem of high manufacturing and use costs caused by the two-part manufacturing of the main body shell of the electric power assisted steering machine.

[0004] The steering device of a vehicle according to the embodiment of the present application comprises: a shell, a first shell cavity and a second shell cavity being connected in the shell, both ends of the first shell cavity being open, the second shell cavity having an opening, a first limiting part and a second limiting part being provided in the second shell cavity, the first limiting part being provided on the side of the second limiting part away from the opening; a rack, the rack being movably provided in the first shell cavity; a gear shaft, the gear shaft being provided in the second shell cavity and being engaged with the rack; a bearing, the bearing being sleeved on the gear shaft and being abutted against the first limiting part; an expansion piece, the expansion piece being abutted against the side of the bearing away from the first limiting part; a tensioning piece, the tensioning piece being at least partially provided on the shell, and the tensioning piece being switchable between a first position and a second position, the tensioning piece driving the expansion piece to expand and combine with the second limiting part when the tensioning piece is in the first position, and the tensioning piece driving the expansion piece to separate from the second limiting part when the tensioning piece is in the second position.

[0005] The steering device of the vehicle according to the embodiment of the present application, by installing the rack in the first shell cavity of the shell, installing the gear shaft in the second shell cavity, and fixing the bearing in the second shell cavity through the first limiting part, the second limiting part, the expansion piece and the tensioning piece, the steering device does not need to set two machine shell to install the rack and the gear shaft, and the installation of the rack and the gear shaft can be realized through the integrated shell, which is beneficial to reduce the manufacturing mold, reduce the manufacturing and using cost, and also helps to reduce the weight of the steering device, improve the overall strength and stiffness, and the whole device structure is simple, convenient and reliable.

[0006] In some embodiments of the present application, the tensioning piece comprises: a force applying part movably arranged on the gear shaft and capable of driving the expansion piece to expand; and a driving part arranged on the shell and connected with the force applying part for driving the force applying part to move.

[0007] In some embodiments of the present application, the expansion piece is an expansion ring, the expansion ring is provided with a notch, the force applying part has a set direction, at least one end of the force applying part in the set direction can abut against the notch, the force applying part can move along the radial direction of the gear shaft, and the width of the force applying part in the set direction gradually increases along the radial direction of the gear shaft.

[0008] In some embodiments of the present application, the notch has two opposite abutting surfaces, and the distance between the two abutting surfaces gradually increases along the radial direction of the gear shaft.

[0009] In some embodiments of the present application, one end of the force applying part close to the inner side of the expansion ring is provided with an anti-disengagement limiting part, and the anti-disengagement limiting part abuts against at least one side of the notch.

[0010] In some embodiments of the present application, a guide structure is arranged between the side of the expansion ring opposite to the notch and the second shell cavity, the guide structure comprises a guide column and a guide groove, one of the guide column and the guide groove is arranged on the expansion ring, and the other is arranged on the second shell cavity.

[0011] In some embodiments of the present application, an axle part is arranged on the gear shaft, a sliding groove is arranged on the axle part, the expansion ring is sleeved on the axle part, and the force applying part is arranged in the sliding groove.

[0012] In some embodiments of the present application, the driving part is a threaded column, a first screw hole is arranged on the shell, a second screw hole is arranged on the force applying part, and the threaded column is arranged in the first screw hole and the second screw hole.

[0013] In some embodiments of the present application, the second limiting part is a limiting groove, and a pre-tightening surface is arranged on the limiting groove and is arranged obliquely along the radial direction of the gear shaft.

[0014] In some embodiments of the present application, the expansion member is provided with a groove extending along the circumferential direction of the gear shaft, the limiting groove is provided with a protrusion extending along the circumferential direction of the gear shaft, the protrusion is arranged in the groove, and the pre-tightening surface is arranged on the groove.

[0015] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0017] Figure 1 is a partial perspective view of a steering device in an embodiment of the present application;

[0018] Figure 2 is a partial perspective view of a housing in an embodiment of the present application;

[0019] Figure 3 is a partial perspective view of a steering device in an embodiment of the present application;

[0020] Figure 4 is a schematic view of the cooperation between the expansion member and the tensioning member in the first position and the second position in an embodiment of the present application;

[0021] Figure 5 is a perspective view of a housing and an expansion member in an embodiment of the present application Figure 1 ;

[0022] Figure 6 is a partial perspective view of a housing and an expansion member in an embodiment of the present application Figure 5 ;

[0023] Figure 7 is a perspective view of an expansion member in an embodiment of the present application;

[0024] Figure 8 is a perspective view of a force applying part in an embodiment of the present application;

[0025] Figure 9 is a perspective view of a housing and an expansion member in an embodiment of the present application Figure 2 ;

[0026] Figure 10 is an exploded view of a gear shaft, an expansion member, a bearing and a force applying part in an embodiment of the present application;

[0027] Figure 11 Fig. 1 is a perspective view of a steering device according to an embodiment of the present application.

[0028] Reference signs:

[0029] 10, steering device;

[0030] 1, housing; 11, first housing cavity; 12, second housing cavity; 12a, open end; 121, first limiting portion; 122, second limiting portion; 1221, pre-tightening surface; 123, protrusion; 13, first screw hole;

[0031] 2, rack;

[0032] 3, pinion shaft; 31, shaft portion; 311, sliding groove;

[0033] 4, bearing;

[0034] 5, expansion member; 51, notch; 52, abutting surface; 53, groove; 54, round or chamfered corner;

[0035] 6, tensioning member; 61, force applying portion; 611, anti-disengagement limiting portion; 612, avoiding groove; 613, second screw hole; 62, driving portion;

[0036] 7, guide structure; 71, guide column; 72, guide groove;

[0037] 8, locking nut. DETAILED DESCRIPTION

[0038] Embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below are examples for explaining the present application and should not be construed as limiting the present application.

[0039] In the description of the present application, it should be understood that the terms "center", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore should not be construed as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present application. In addition, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features, which are used to distinguish the described features, and have no order or priority.

[0040] In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0041] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] The steering device 10 of the vehicle according to an embodiment of the present application will be described below with reference to the accompanying drawings. Figures 1-11

[0043] As shown in Figure 1 and Figure 11 , the steering device 10 of the vehicle according to an embodiment of the present application comprises a housing 1, a rack 2, a pinion shaft 3, a bearing 4, an expansion member 5, and a tensioning member 6.

[0044] The housing 1 is provided with a first housing cavity 11 and a second housing cavity 12 in communication. The first housing cavity 11 is open at both ends, and the second housing cavity 12 has an opening 12a. The second housing cavity 12 is provided with a first limiting portion 121 and a second limiting portion 122, and the first limiting portion 121 is provided on the side of the second limiting portion 122 away from the opening 12a. The rack 2 is movably arranged in the first housing cavity 11. The pinion shaft 3 is arranged in the second housing cavity 12 and engages with the rack 2. The bearing 4 is sleeved on the pinion shaft 3 and abuts against the first limiting portion 121. The expansion member 5 abuts against the side of the bearing 4 away from the first limiting portion 121. The tensioning member 6 is at least partially arranged on the housing 1, and the tensioning member 6 can be switched between a first position and a second position. When the tensioning member 6 is in the first position, it drives the expansion member 5 to expand and combine with the second limiting portion 122. When the tensioning member 6 is in the second position, it drives the expansion member 5 to separate from the second limiting portion 122.

[0045] The steering device 10 can be an electric power assisted steering device, and the electric power assisted steering device includes but is not limited to a worm and worm gear type. The first housing cavity 11 can be used to mount the rack 2, and the second housing cavity 12 can be used to mount the pinion shaft 3, that is, the housing 1 integrates the rack housing and the power assisting housing, and does not need to be manufactured by two sets of molds at the time of manufacturing, which can reduce the manufacturing cost.

[0046] The two ends of the rack 2 can protrude out of the two ends of the first housing cavity 11 for driving the wheels on both sides of the vehicle to steer. The pinion shaft 3 can be assembled with the bearing 4 and the expansion member 5, and then installed into the second housing cavity 12 through the opening 12a. The first limiting portion 121 can abut against one end of the bearing 4 (such as Figure 1 ​the lower end of the intermediate bearing 4), the expansion member 5 can abut against the other end of the bearing 4 (e.g. Figure 1 the upper end of the intermediate bearing 4), the expansion member 5 can abut against the other end of the bearing 4 (e.g. Figure 4 , Fig. (a) the expansion member 6 is in the second position, Fig. (c) the expansion member 6 is in the first position), the bearing 4 can be limited by driving the expansion member 5 to expand, so that the expansion member 5 is combined with the second limiting portion 122, so that the bearing 4 can be fixed in the second cavity 12, and the gear shaft 3 can rotate in the second cavity 12 through the bearing 4, and then drive the rack 2 to move in the first cavity 11 to adjust the steering of the vehicle.

[0047] When the gear shaft 3 needs to be disassembled, the expansion member 6 can be switched from the first position to the second position (refer to Figure 4 (a)), by weakening or removing the force of the expansion member 6 on the expansion member 5, and then the expansion member 5 is disengaged from the second limiting portion 122, so that the gear shaft 3, the bearing 4 and the expansion member 5 are removed from the second cavity 12.

[0048] The expansion member 5 can be made of a high-strength and high-hardness elastic material, for example, high-manganese high-carbon steel. Specifically, the expansion member 5 can be made of spring steel. The expansion member 6 can be a component that can apply a force to cause the expansion member 5 to deform and expand, and the shape of the expansion member 6 includes but is not limited to a rod or a block, which directly acts on the expansion member 5. The expansion member 6 can also be a magnetic member, which can also cause the expansion member 5 to deform and expand by magnetic force without contacting the expansion member 5. The bearing 4 includes but is not limited to a four-point contact bearing.

[0049] The steering device 10 of the vehicle according to the embodiment of the present application, by installing the rack 2 in the first cavity 11 of the housing 1, installing the gear shaft 3 in the second cavity 12, and fixing the bearing 4 in the second cavity 12 by the first limiting portion 121, the second limiting portion 122, the expansion member 5 and the expansion member 6, so that the steering device 10 does not need to set two machine cases to install the rack 2 and the gear shaft 3, and the rack 2 and the gear shaft 3 can be installed by the integrated housing 1, which is beneficial to reduce the manufacturing mold, reduce the manufacturing and using cost, and also help to reduce the weight of the steering device 10, improve the overall strength and stiffness, and the whole device structure is simple, easy to install and has high reliability.

[0050] In some embodiments of the present application, as shown in Figure 1 , Figure 3 and Figure 4 , the expansion member 6 includes a force applying portion 61 and a driving portion 62. The force applying portion 61 is movably arranged on the gear shaft 3 and can drive the expansion member 5 to expand. The driving portion 62 is arranged on the housing 1, and the driving portion 62 is connected with the force applying portion 61 for driving the force applying portion 61 to move.

[0051] In the above scheme, the tensioning member 6 is of a split structure, which can be manufactured in two molds in the manufacturing stage, instead of using a relatively complex mold, thereby reducing the complexity of the mold and the manufacturing difficulty.

[0052] Since the force applying part 61 is movably arranged on the gear shaft 3, the gear shaft 3 can limit the force applying part 61, thereby improving the movement reliability of the force applying part 61. The force applying part 61 directly acts on the expansion part 5 and drives the expansion part 5 to expand. The way of driving the expansion part 5 to expand is simple, and the stability of driving the expansion part 5 to expand is good. The driving part 62 is arranged on the housing 1, and the driving part 62 can provide the power required by the movement of the force applying part 61. For example, Figure 4 In the first position of the tensioning member 6, the driving part 62 drives the force applying part 61 to move, and the force applying part 61 drives the expansion part 5 to expand. For example, Figure 4 In the second position of the tensioning member 6, the driving part 62 drives the force applying part 61 to move reversely, the expansion part 5 can be reset, and the gear shaft 3 can be disassembled.

[0053] In some embodiments, the force applying part 61 can be an extrusion block, and the driving part 62 can be a telescopic part, for example, a gas cylinder or an electric push rod. The telescopic part drives the extrusion block to extrude the expansion part 5, so that the expansion part 5 is combined with the second limiting part 122 to limit the upper end face of the bearing 4.

[0054] In some embodiments, the expansion part 5 can be a plurality of expansion parts arranged at intervals along the circumferential direction of the bearing 4. In this scheme, the plurality of expansion parts 5 can limit the positions of the bearing 4, thereby achieving uniform limiting of the bearing 4 and improving the reliability and limiting effect of the bearing 4.

[0055] Optionally, the number of the tensioning members 6 can be equal to and one-to-one corresponding to the number of the expansion parts 5, and each tensioning member 6 can drive the corresponding expansion part 5 to expand.

[0056] Optionally, the tensioning member 6 can drive a plurality of expansion parts 5 to expand. In combination with the foregoing, taking the force applying part 61 as an extrusion block and the driving part 62 as a telescopic part as an example, the extrusion block can be an annular block. When the telescopic part drives the annular block to move, the plurality of expansion parts 5 can be driven to expand.

[0057] In some embodiments of the present application, as shown in Figure 1 , Figures 4 to 7 the expansion part 5 is an expansion ring, the expansion ring is provided with a notch 51, the force applying part 61 has a set direction, at least one end of the force applying part 61 in the set direction can abut against the notch 51, the force applying part 61 can move along the radial direction of the gear shaft 3, and the width of the force applying part 61 in the set direction gradually increases along the radial direction of the gear shaft 3.

[0058] The expansion ring is annular in structure, which can provide a larger limiting surface and a more uniform limiting effect on the circumference of the bearing 4, thereby improving the stability and reliability of the bearing 4. The driving part 62 can drive the force applying part 61 to move along the radial direction of the gear shaft 3, and the setting direction can be the Figure 4 middle-to-back direction, as shown in Figure 4 (a), (b), and (c), since the width of the force applying part 61 gradually increases along the radial direction of the gear shaft 3, as the force applying part 61 moves, the force applying part 61 can drive the gap 51 to expand, and in turn drive the expansion ring to expand and limit the bearing 4 in cooperation with the second limiting part 122. The expansion mode of the expansion ring is relatively simple and easy to implement.

[0059] Alternatively, the force applying part 61 can drive the expansion ring to expand when moving from the outside of the expansion ring to the center, and the direction in which the force applying part 61 drives the expansion ring to expand at this time is set as the first direction, and the width of the force applying part 61 gradually increases in the first direction. The force applying part 61 can also drive the expansion ring to expand when moving from the center of the expansion ring to the outside, and the direction in which the force applying part 61 drives the expansion ring to expand at this time is set as the second direction, and the width of the force applying part 61 gradually increases in the second direction.

[0060] Alternatively, the shape of the force applying part 61 includes but is not limited to a wedge-shaped block.

[0061] Alternatively, as shown in Figure 7 the side of the gap 51 close to the second cavity 12 is provided with a round corner or a chamfer 54. The round corner and the chamfer 54 are beneficial to enhance the strength and reliability when the gap 51 cooperates with the force applying part 61.

[0062] In some embodiments of the present application, as shown in Figure 4 (c) and Figure 7 the gap 51 has two opposite abutting surfaces 52, and the distance between the two abutting surfaces 52 gradually increases along the radial direction of the gear shaft 3.

[0063] The two abutting surfaces 52 can be adapted to the shape of the force applying part 61. As described above, the force applying part 61 can be wedge-shaped, and the two sides of the force applying part 61 can be inclined surfaces. The gap 51 contacts the inclined surfaces of the force applying part 61 through the abutting surfaces 52, which can increase the contact surface between the two, thereby reducing wear, avoiding stress concentration on the expansion ring, reducing damage, improving the safety of the expansion ring, prolonging the service life of the expansion ring, and making the contact between the force applying part 61 and the gap 51 smoother, thereby stabilizing the expansion process of the expansion ring.

[0064] In some embodiments of the present application, as shown in Figure 8As shown, the end of the force applying part 61 close to the inner side of the expansion ring is provided with an anti-disengagement limiting part 611, which abuts at least one side of the gap 51. In this technical solution, when the force applying part 61 passes through the gap 51 and gradually disengages from the gap 51, the anti-disengagement limiting part 611 abuts at one side or both sides of the gap 51, preventing the force applying part 61 from disengaging from the expansion ring, which is conducive to improving the installation reliability of the force applying part 61 and ensuring that the force applying part 61 can be reset smoothly. Optionally, the anti-disengagement limiting part 611 can include but is not limited to a limiting platform or a limiting block.

[0065] In some embodiments of the present application, as shown in Figure 8 As shown, the side of the force applying part 61 close to the gear shaft 3 is provided with an avoiding groove 612, which can play a role in avoiding the gear shaft 3, reducing the risk of interference with the rotation of the gear shaft 3 while increasing the reliability of the force applying part 61.

[0066] In some embodiments of the present application, as shown in Figure 9 As shown, a guide structure 7 is arranged between the side of the expansion ring opposite to the gap 51 and the second shell cavity 12, the guide structure 7 includes a guide column 71 and a guide groove 72, one of the guide column 71 and the guide groove 72 is arranged on the expansion ring, and the other is arranged on the second shell cavity 12. In this technical solution, the guide structure 7 can play a guiding role in the installation process of the expansion ring on the gear shaft 3, so that the gap 51 is opposite to the force applying part 61, improving the positional accuracy between the gap 51 and the force applying part 61.

[0067] Among them, the guide column 71 can be arranged on the expansion ring, and the guide groove 72 can be arranged on the cavity wall of the second shell cavity 12; the guide column 71 can also be arranged on the cavity wall of the second shell cavity 12, and the guide groove 72 can be arranged on the expansion ring.

[0068] Optionally, the shape of the guide column 71 includes but is not limited to a cylindrical shape, a prism shape.

[0069] In some embodiments of the present application, as shown in Figure 10 As shown, the gear shaft 3 is provided with a shaft part 31, the shaft part 31 is provided with a sliding groove 311, the expansion ring is sleeved on the shaft part 31, and the force applying part 61 is arranged in the sliding groove 311.

[0070] That is, the sliding groove 311 can provide the installation space required by the force applying part 61, so that the structure on the gear shaft 3 is more compact, space is saved, and the volume of the assembly formed by the gear shaft 3 and the force applying part 61 is reduced. Secondly, the sliding groove 311 can provide guiding and supporting effect for the movement of the force applying part 61, improving the movement reliability and stability of the force applying part 61.

[0071] In some embodiments of the present application, as shown in Figure 1 , Figure 3 , Figure 4 ,Figure 8 As shown in the drawings, the driving part 62 is a threaded column, the shell 1 is provided with a first screw hole 13, the force applying part 61 is provided with a second screw hole 613, and the threaded column is arranged in the first screw hole 13 and the second screw hole 613. In this technical solution, the threaded column can be a bolt or a stud, the threaded column can rotate in the first screw hole 13 and the second screw hole 613, and the rotation of the threaded column can drive the force applying part 61 to reciprocate along the radial direction of the gear shaft 3. By using this driving mode, the structure is relatively simple, the operation is relatively convenient, and the cost can be reduced.

[0072] In some embodiments of the present application, as shown in Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 9 As shown in the drawings, the second limiting part 122 is a limiting groove, the limiting groove is provided with a pre-tightening surface 1221, and the pre-tightening surface 1221 is inclinedly arranged on the side of the radial opening 12a of the gear shaft 3.

[0073] As shown in Figure 2 and Figure 6 , the pre-tightening surface 1221 is inclinedly arranged on the side of the radial opening 12a of the gear shaft 3, and specifically can be an upwardly inclined inclined surface. When the expansion piece 5 expands and cooperates with the limiting groove, as the expansion degree of the expansion piece 5 increases, the pre-tightening surface 1221 can apply a force directed to the side of the bearing 4 to the expansion piece 5, so as to drive the expansion piece 5 to press tightly on the bearing 4, thereby improving the limiting effect on the bearing 4.

[0074] In some embodiments of the present application, as shown in Figure 5 and Figure 6 , the expansion piece 5 is provided with a groove 53 extending along the circumferential direction of the gear shaft 3, the limiting groove is provided with a protrusion 123 extending along the circumferential direction of the gear shaft 3, the protrusion 123 is arranged in the groove 53, and the groove 53 is provided with the pre-tightening surface 1221. In this technical solution, the cooperation of the protrusion 123 and the groove 53 can enhance the fixing strength and rigidity of the expansion piece 5 on the bearing 4, thereby improving the limiting effect on the bearing 4.

[0075] Optionally, the protrusion 123 and the groove 53 can have a ring structure or a strip structure.

[0076] Optionally, as shown in Figure 6 , a plurality of protrusions 123 and grooves 53 are arranged along the axial direction of the bearing 4. By increasing the number of the protrusions 123 and the grooves 53, the fixing strength and rigidity of the expansion piece 5 on the bearing 4 can be further improved.

[0077] In some embodiments of the present application, as shown in Figure 1 and Figure 10As shown, the bearing 4 comprises an inner ring and an outer ring, the inner ring is sleeved on the gear shaft 3, the outer ring is sleeved on the inner ring, the outer ring is abutted against the first limiting portion 121 and the expansion member 5, the gear shaft 3 is provided with a locking nut 8, and the locking nut 8 is abutted against the inner ring.

[0078] Other configurations and operations of the steering device 10 of the vehicle according to the embodiments of the present application are known to those skilled in the art, and thus will not be described in detail herein.

[0079] In the description of the present specification, the description referring to the terms "some embodiments", "optionally", "further", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0080] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A steering device for a vehicle, characterized in that: include: A housing, wherein a first housing cavity and a second housing cavity are connected therein, the first housing cavity is open at both ends, the second housing cavity has an opening, a first limiting portion and a second limiting portion are provided in the second housing cavity, the first limiting portion is provided on a side of the second limiting portion away from the opening; a rack, the rack being movably disposed in the first housing cavity; a gear shaft disposed in the second housing cavity and meshing with the rack; a bearing, the bearing being sleeved on the gear shaft and abutting against the first limiting portion; an expansion member, the expansion member abutting against a side of the bearing away from the first limiting portion; A tensioning member, wherein the tensioning member is at least partially arranged on the shell, and the tensioning member can be switched between a first position and a second position. When the tensioning member is in the first position, the expansion member is driven to expand and combine with the second limiting portion. When the tensioning member is in the second position, the expansion member is driven to separate from the second limiting portion.

2. The vehicle steering device according to claim 1, characterized in that: The tensioning member comprises: a force applying portion, the force applying portion being movably disposed on the gear shaft and capable of driving the expansion member to expand; The driving part is provided on the housing and is connected to the force applying part for driving the force applying part to move.

3. The vehicle steering device according to claim 2, characterized in that: The expansion part is an expansion ring, which is provided with a notch. The force-applying part has a set direction. At least one end of the force-applying part located in the set direction can abut against the notch. The force-applying part can move along the radial direction of the gear shaft, and the width of the force-applying part in the set direction gradually increases along the radial direction of the gear shaft.

4. The vehicle steering device according to claim 3, characterized in that: The notch has two opposite stop surfaces, and the distance between the two stop surfaces gradually increases along the radial direction of the gear shaft.

5. The vehicle steering device according to claim 3, characterized in that: An anti-slip limit portion is provided at one end of the force-applying portion close to the inner side of the expansion ring, and the anti-slip limit portion abuts against at least one side of the notch.

6. The vehicle steering device according to claim 3, characterized in that: A guide structure is provided between the side of the expansion ring opposite to the notch and the second shell cavity. The guide structure includes a guide column and a guide groove. One of the guide column and the guide groove is provided on the expansion ring, and the other is provided on the second shell cavity.

7. The vehicle steering device according to claim 3, characterized in that: The gear shaft is provided with a shaft portion, the shaft portion is provided with a sliding groove, the expansion ring is sleeved on the shaft portion, and the force applying portion is provided in the sliding groove.

8. The vehicle steering device according to claim 2, characterized in that: The driving part is a threaded column, the shell is provided with a first screw hole, the force applying part is provided with a second screw hole, and the threaded column is passed through the first screw hole and the second screw hole.

9. The vehicle steering device according to claim 1, characterized in that: The second limiting portion is a limiting groove, and a pre-tightening surface is provided on the limiting groove. The pre-tightening surface is inclined along the radial direction of the gear shaft on the side of the opening.

10. The vehicle steering device according to claim 9, characterized in that: The expansion member is provided with a groove extending along the circumference of the gear shaft, the limiting groove is provided with a convex portion extending along the circumference of the gear shaft, the convex portion is arranged in the groove, and the groove is provided with the pre-tightening surface.

Images