Rear wheel steering mechanism and vehicle

Abstract

The utility model discloses a rear-wheel steering mechanism and a vehicle. The rear-wheel steering mechanism comprises a shell, a rear-wheel steering assembly and a rear-wheel steering assembly, the transmission shaft is mounted on the shell; the limiting piece is installed on the shell and matched with the transmission shaft in a limiting mode so as to limit the transmission shaft to rotate around the central axis of the transmission shaft, and the transmission shaft can move in the axial direction of the transmission shaft relative to the limiting piece. Therefore, the driving assembly drives the transmission shaft to move, the limiting piece is in limiting fit with the transmission shaft, the effect of preventing the transmission shaft from rotating is achieved, and therefore the transmission shaft does linear motion in the axial direction.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a rear-wheel steering mechanism and a vehicle. Background Art

[0002] Currently, vehicles are equipped with rear-wheel steering devices to make the vehicle more maneuverable at low speeds and more stable when cornering at high speeds. The rear-wheel steering device includes a spindle connected to the wheel via a tie rod. A steering motor drives the spindle in linear motion, which in turn drives the tie rod, thereby satisfying the rear-wheel steering adjustment requirements.

[0003] In the related art, components such as pins are usually used to limit the rotation of the main shaft, and the driving method of the main shaft is complex and requires a large number of components. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems in the prior art. To this end, one purpose of the present application is to provide a rear wheel steering mechanism that can limit the rotational movement of a transmission shaft.

[0005] The present application also proposes a vehicle.

[0006] According to the rear-wheel steering mechanism of the first aspect embodiment of the present application, it includes: a housing; a transmission shaft, which is installed on the housing and is used to connect with the drive screw assembly; a limit member, which is installed on the housing and sleeved on the outer circumference of the transmission shaft, and the limit member is limitedly cooperated with the transmission shaft to limit the rotation of the transmission shaft around its central axis, and the transmission shaft can move relative to the limit member along the axial direction of the transmission shaft.

[0007] In the present application, the drive shaft is driven to move by the driving assembly, and the drive shaft is limited by the limiting member to prevent the drive shaft from rotating, so that the driving screw assembly can drive the drive shaft to move linearly in the axial direction.

[0008] In some embodiments of the present application, the limiting member is constructed as a limiting sleeve, the limiting sleeve is arranged on the transmission shaft, and the inner circumferential wall of the limiting sleeve is provided with a limiting portion; the outer circumferential wall of the transmission shaft is provided with a limiting matching portion, and the limiting portion is limitedly matched with the limiting matching portion.

[0009] In some embodiments of the present application, the limiting portion is provided with a limiting surface, the limiting matching portion is constructed as a limiting matching surface, and the limiting surface is limitedly matched with the limiting matching surface.

[0010] In some embodiments of the present application, the limiting surface is a plane, and the plane is arranged parallel to the axial direction of the transmission shaft; the limiting matching surface is a plane, and fits with the limiting surface.

[0011] In some embodiments of the present application, at least one of the limiting surface and the limiting mating surface is provided with a friction-reducing coating.

[0012] In some embodiments of the present application, the limiting portion is provided with a through groove, which is recessed from the limiting surface along the radial direction toward a side away from the transmission shaft to form a communication channel between the transmission shaft and the limiting member.

[0013] In some embodiments of the present application, an extending direction of the through groove is parallel to an axial direction of the transmission shaft.

[0014] In some embodiments of the present application, in the projection of the through groove extension direction, the through groove is arranged in the middle of the limiting surface; and / or, in the projection of the through groove extension direction, the groove wall of the through groove extends in an arc shape and is constructed as an arc surface.

[0015] In some embodiments of the present application, there are multiple limiting surfaces, and the multiple limiting surfaces are arranged in the circumferential direction of the inner peripheral wall of the limiting sleeve.

[0016] In some embodiments of the present application, the transmission shaft includes: a first shaft segment, the first shaft segment forms the limiting portion and cooperates with the limiting member to limit the position.

[0017] In some embodiments of the present application, the transmission shaft further includes: a second shaft segment, the second shaft segment is connected to one end of the first shaft segment in the axial direction, and the radial dimension of the second shaft segment is greater than the radial dimension of the first shaft segment.

[0018] In some embodiments of the present application, the outer peripheral wall of the limiting sleeve is provided with external splines, the shell is provided with internal splines, and the limiting sleeve cooperates with the shell splines to limit the rotation of the limiting sleeve relative to the shell.

[0019] In some embodiments of the present application, the drive screw assembly includes: a drive screw, which is connected to the transmission shaft and is used to drive the transmission shaft to move synchronously; a drive sleeve, which is threadedly engaged with the drive screw and is used to drive the drive screw to move in the axial direction.

[0020] In some embodiments of the present application, the transmission shaft includes: a first transmission shaft, which is connected to one end of the driving screw; and a second transmission shaft, which is connected to the other end of the driving screw; wherein the first transmission shaft, the second transmission shaft and the driving screw are coaxially arranged.

[0021] In some embodiments of the present application, the limiting member is in position-limiting cooperation with the first transmission shaft or the second transmission shaft; or, there are two limiting members, and the two limiting members are respectively in position-limiting cooperation with the first transmission shaft and the second transmission shaft.

[0022] In some embodiments of the present application, the housing is provided with a slide groove, which extends along the axial direction of the driving screw; the rear-wheel steering mechanism also includes a slider, which is connected to the driving screw, and the slider is provided in the slide groove and is suitable for synchronous movement with the driving screw relative to the housing.

[0023] In some embodiments of the present application, the sliding block is gap-matched with the wall surface of the sliding groove.

[0024] In some embodiments of the present application, the rear-wheel steering mechanism further includes: a driving device, which is installed on the housing and is used to drive the driving sleeve to rotate.

[0025] In some embodiments of the present application, the rear-wheel steering mechanism further includes a transmission assembly, which includes: a transmission wheel, which is connected to the driving device; a transmission belt, which is used to connect the transmission wheel and the drive sleeve, and the transmission wheel can drive the drive sleeve to rotate through the transmission belt.

[0026] The vehicle according to the second embodiment of the present application includes the above-mentioned rear-wheel steering mechanism.

[0027] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0029] Figure 1 is a cross-sectional view of a rear-wheel steering mechanism according to an embodiment of the present application;

[0030] Figure 2 This is a schematic diagram of the transmission shaft according to the embodiment of the present application. Figure 1 ;

[0031] Figure 3 This is a schematic diagram of the transmission shaft according to the embodiment of the present application. Figure 2 ;

[0032] Figure 4 This is a schematic diagram of the limiter according to the embodiment of the present application. Figure 1 ;

[0033] Figure 5This is a schematic diagram of the limiter according to the embodiment of the present application. Figure 2 ;

[0034] Figure 6 This is a schematic diagram of the cooperation between the slider and the slide groove according to the embodiment of the present application.

[0035] Reference numerals:

[0036] Rear wheel steering mechanism 100;

[0037] Housing 1; chute 11;

[0038] Transmission shaft 2; first transmission shaft 201; second transmission shaft 202; first shaft section 203; second shaft section 204; position-limiting fitting portion 21;

[0039] Drive screw assembly 3; drive screw 31; drive sleeve 32;

[0040] Limiting member 4; limiting portion 41; limiting surface 411; sub-limiting surface 4111; through groove 412; anti-friction coating 413; external spline 414;

[0041] Support bearing 5; slider 6; cylindrical pin 7; sealing groove 71; sealing member 72; driving device 8; transmission assembly 9; transmission wheel 91; transmission belt 92. DETAILED DESCRIPTION

[0042] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0043] Reference below Figures 1-6 The rear wheel steering mechanism 100 according to an embodiment of the present application is described. The rear wheel steering mechanism 100 in the present application is applied to a vehicle and used for adjusting the rotation of the rear wheels of the vehicle. Here, "rear wheel rotation" refers to driving the rear wheels to swing to achieve steering adjustment of the rear wheels.

[0044] like Figure 1 As shown, the rear wheel steering mechanism 100 in the present application includes: a housing 1 , a transmission shaft 2 , a driving screw assembly 3 and a limiting member 4 .

[0045] The housing 1 is a mounting carrier for the transmission shaft 2, the drive screw assembly 3 and the limit member 4. The transmission shaft 2 is mounted on the housing 1 and can rotate the rear wheel through a connecting rod mechanism (not shown) connected thereto.

[0046] Reference Figure 1The drive screw assembly 3 includes a drive screw 31 and a drive sleeve 32. The drive screw 31 is connected to the transmission rod and is coaxially arranged with the transmission rod. The drive screw 31 can drive the transmission shaft 2 to move synchronously. The drive sleeve 32 is disposed within the housing 1 and is threadedly engaged with the drive screw 31. The drive sleeve 32 can drive the drive screw 31 to move in the axial direction, thereby driving the transmission shaft 2 to move in the axial direction through the drive screw 31.

[0047] The limit member 4 is installed on the housing 1 and is sleeved on the transmission shaft 2. The limit member 4 and the transmission shaft 2 are limited and matched to limit the rotation of the transmission shaft 2 around its central axis. The transmission shaft 2 can move relative to the limit member 4 along the axial direction of the transmission shaft 2.

[0048] like Figure 1 As shown, the transmission shaft 2 is connected to one end of the drive screw 31 in the axial direction, and the drive screw 31 moves synchronously with the transmission shaft 2. At the same time, since the transmission shaft 2 can only move in the axial direction relative to the limit member 4, when the drive sleeve 32 is threadedly engaged with the drive screw 31, the drive screw 31 can drive the transmission shaft 2 to move synchronously in the axial direction.

[0049] It is understood that the transmission shaft 2 is limitedly engaged with the stopper 4, preventing the transmission shaft 2 from rotating about its own central axis. Furthermore, the drive screw 31 is connected to and moves synchronously with the transmission shaft 2, preventing the drive screw 31 from rotating about its central axis. Thus, during the threaded engagement between the drive sleeve 32 and the drive screw 31, the drive screw 31 can move linearly in the axial direction and drive the connected transmission shaft 2 to move synchronously, thereby driving the transmission shaft 2 to move linearly in the axial direction.

[0050] It should be noted that in a rear-wheel steering device, the main shaft needs to reciprocate along a straight line to meet the rear-wheel steering adjustment requirements. In related technologies, components such as pins are used to limit the rotation of the main shaft, which requires a large number of components and a complex structure.

[0051] In the present application, the drive screw assembly 3 drives the transmission shaft 2 to move, and the limit member 4 limits the transmission shaft 2 to prevent the transmission shaft 2 from rotating. The rotation of the drive screw 31 can be further limited, so that the drive screw 31 can move linearly relative to the housing 1 and drive the transmission shaft 2 connected thereto to move axially. The drive screw 31 can be made to reciprocate in the axial direction by adjusting the rotation direction of the drive sleeve 32.

[0052] Combine Figure 2 and Figure 4In some embodiments of the present application, the limiting member 4 is constructed as a limiting sleeve, which is arranged on the transmission shaft 2, and the inner peripheral wall of the limiting sleeve is provided with a limiting portion 41, and the outer peripheral wall of the transmission shaft 2 is provided with a limiting matching portion 21. The limiting portion 41 is limited and matched with the limiting matching portion 21 to limit the rotation of the transmission shaft 2 around its central axis.

[0053] The limiting sleeve is fitted with the transmission shaft 2 , and the limiting portion 41 cooperates with the limiting matching portion 21 to limit the transmission shaft 2 in the circumferential direction to restrict the transmission shaft 2 from rotating around its central axis.

[0054] It should be noted that the limiter 4 is mounted on the housing 1 and is fixed relative to the housing 1. When the limiter 4 is engaged with the transmission shaft 2, the transmission shaft 2 cannot rotate relative to the housing 1 and can only move linearly in the axial direction relative to the housing 1.

[0055] Reference Figure 4 In some embodiments of the present application, the outer peripheral wall of the limit sleeve is provided with an external spline 414, and the shell 1 is provided with an internal spline. The limit sleeve cooperates with the shell 1 spline to limit the rotation of the limit sleeve relative to the shell 1.

[0056] It is understood that the spline fit method has high centering accuracy and good centering stability, which can ensure the reliability of the fit between the limit sleeve and the housing 1. The housing 1 is formed with an inner hole for the transmission shaft 2 to pass through, and the above-mentioned internal spline is formed on the wall surface of the inner hole. The internal spline can cooperate with the spline of the limit sleeve, thereby limiting the fit of the limit sleeve and the housing 1.

[0057] The limiting sleeve is a hollow cylindrical structure and is coaxially arranged with the transmission shaft 2. Due to the splined fit between the limiting sleeve and the housing 1, the limiting sleeve cannot rotate relative to the housing 1. The limiting sleeve can also be engaged with the transmission shaft 2 to prevent the transmission shaft 2 from rotating relative to the limiting sleeve, thereby limiting the rotation of the transmission shaft 2 relative to the housing 1.

[0058] It should be noted that the cooperation mode of the limit sleeve and the shell 1 is not limited to this. The cooperation form of the limit structure between the limit sleeve and the shell 1 can also be a limit groove and a limit protrusion, etc., which is not further limited here and can be designed according to assembly and processing requirements.

[0059] Combine Figure 2-Figure 5 In some embodiments of the present application, the limiting portion 41 is provided with a limiting surface 411, and the limiting matching portion 21 is constructed as a limiting matching surface. The limiting surface 411 is limitedly matched with the limiting matching surface, thereby limiting the rotation of the transmission shaft 2.

[0060] The limiting sleeve and the transmission shaft 2 are engaged in a surface-to-surface engagement (i.e., the limiting surface 411 and the limiting engagement surface). It is understood that the limiting sleeve and the transmission shaft 2 are sleeved together, with the limiting portion 41 formed on the inner side of the limiting sleeve and the limiting engagement portion 21 formed on the outer side of the transmission shaft 2. By constructing the limiting engagement structure as a surface structure, the difficulty of manufacturing the limiting sleeve and the transmission shaft 2 can be reduced.

[0061] Combine Figure 2 and Figure 4 The limiting surface 411 is a plane and is parallel to the axial direction of the transmission shaft 2. The limiting mating surface is a plane and fits the limiting mating surface 411 to achieve a good anti-rotation effect. The plane structure is simple and easy to process.

[0062] Among them, when the limiting surface 411 is limitedly matched with the limiting matching surface, the limiting surface 411 remains parallel to the axial direction of the transmission shaft 2, and the transmission shaft 2 can move in the axial direction relative to the limiting member 4, thereby meeting the adjustment requirements of the transmission shaft 2 to perform linear motion in the axial direction.

[0063] It should be noted that the shape of the limiting surface 411 is not limited to a plane, and can also be configured as a V-shape (i.e., composed of two planes with a certain angle), a wave shape (i.e., a continuously extended curved surface), etc. The shape of the limiting mating surface is adapted to the shape of the limiting surface 411. At the same time, it is necessary to ensure that the limiting surface 411 and the limiting mating surface can slide relative to each other in the axial direction of the transmission shaft 2.

[0064] In some embodiments of the present application, at least one of the limiting surface 411 and the limiting mating surface is provided with a friction-reducing coating, and the friction-reducing coating 413 can play a buffering role between the limiting surface 411 and the limiting mating surface to reduce the friction between the limiting surface 411 and the limiting mating surface, so that the movement of the transmission shaft 2 relative to the limiting member 4 is more stable and smooth.

[0065] Among them, the anti-friction coating 413 can be made of a metal material or a composite material (including metal material and non-metallic material) with a low friction coefficient and high wear resistance. The anti-friction coating 413 has good self-lubricating properties and wear resistance, thereby reducing the friction resistance between the transmission shaft 2 and the limit member 4, and improving the stability and smoothness of the transmission shaft 2 during movement.

[0066] Specifically, the anti-friction coating 413 is provided on the limiting surface 411 to reduce friction at the limiting surface 411 and improve wear resistance at the limiting surface 411; the anti-friction coating is provided on the limiting mating surface to reduce friction at the limiting mating surface and improve wear resistance at the limiting mating surface. Of course, the anti-friction coating 413 can also be provided on both the limiting surface 411 and the limiting mating surface.

[0067] In some embodiments of the present application, the friction between the limit member 4 and the inner wall of the shell 1 is greater than the friction between the limit member 4 and the transmission shaft 2, so that when the transmission shaft 2 moves relative to the limit member 4, the position of the limit member 4 relative to the shell 1 can remain fixed.

[0068] like Figure 4 As shown, in some embodiments of the present application, the limiting portion 41 is provided with a through groove 412 , which is recessed from the limiting surface 411 along the radial direction toward the side away from the transmission shaft 2 to form a communication channel between the transmission shaft 2 and the limiting member 4 .

[0069] The connecting channel connects the cavities in the housing 1 on either side of the axial direction of the stopper 4 to form a ventilation structure. During axial movement of the transmission shaft 2, the connecting channel allows gas to circulate, ensuring pressure balance in the cavities on either side of the axial direction of the stopper 4. This eliminates the need for further vent holes in the housing 1, reducing the difficulty of manufacturing and designing the housing 1.

[0070] Combine Figure 2 and Figure 4 The through groove 412 is provided at the limiting portion 41 , which can reduce the contact area between the limiting surface 411 and the limiting matching surface, thereby making the movement of the transmission shaft 2 more stable and smooth.

[0071] like Figure 2 and Figure 4 As shown, in some embodiments of the present application, the extending direction of the through groove 412 is parallel to the axial direction of the transmission shaft 2, so that the communication channel extends in a straight line, which facilitates gas circulation and helps balance the pressure in the housing 1. At the same time, the straight-line extending through groove 412 is easy to process, which can reduce the difficulty of processing the limiter 4.

[0072] It should be noted that the extension of the through groove 412 is not limited to a straight line, but can also extend in a curve (such as an S shape). In other words, the shape of the through groove 412 can be designed according to needs to ensure gas circulation to balance the pressure in the shell 1.

[0073] like Figure 5 As shown, in some embodiments of the present application, in the projection of the extension direction of the through groove 412, the through groove 412 is arranged in the middle of the limiting surface 411, so as to ensure the size of the through groove 412 and improve the effect of the flow channel for gas circulation.

[0074] Reference Figure 4 The through slot 412 located in the middle of the limiting portion 41 is arranged to penetrate along the axial direction, thereby separating the limiting surface 411 into two coplanar sub-limiting surfaces 4111.

[0075] Reference Figure 5The stopper 4 is hollow and cylindrical, and the wall thickness of the stopper 4 at the stopper portion 41 is greater than the wall thickness of the area without the stopper portion 41. Moreover, because the stopper portion 41 and the stopper surface 411 of the transmission shaft 2 are flat, the thickness of the stopper portion 41 is greatest in the middle. Therefore, arranging the through-slot 412 in the middle of the stopper portion 41 ensures the size of the through-slot 412 and the thickness of the stopper 4.

[0076] like Figure 4 and Figure 5 As shown, in some embodiments of the present application, in the projection of the through-slot 412 in its extension direction, the groove wall of the through-slot 412 extends in an arc shape and is configured as an arcuate surface. When the position-limiting member 4 is engaged with the transmission shaft 2, the arcuate surface and the engagement surface are disposed opposite each other and together define a communication channel. It should be noted that the through-slot 412 can be configured as a rectangular groove, a V-shaped groove, etc.

[0077] like Figure 5 As shown, in some embodiments of the present application, multiple limiting surfaces 411 are provided, and these multiple limiting surfaces 411 are arranged circumferentially along the inner circumferential wall of the limiting member 4 to enhance the limiting effect of the limiting member 4 on the transmission shaft 2. The multiple limiting surfaces 411 can be sequentially spaced apart along the circumferential direction of the inner circumferential wall, and the transmission shaft 2 also has multiple limiting mating surfaces formed thereon, with the multiple limiting surfaces 411 corresponding to the multiple limiting mating surfaces.

[0078] Reference Figure 5 In a specific embodiment of the present application, there are two limiting surfaces 411, and the two limiting surfaces 411 are opposite and spaced apart. Figure 3 , two limiting matching surfaces are also correspondingly provided on the transmission shaft 2 , and the two limiting matching surfaces can respectively be limitedly matched with the two limiting surfaces 411 .

[0079] Furthermore, a through groove 412 is formed on at least one limiting surface 411 to form at least one communication channel between the limiting member 4 and the transmission shaft 2 to improve the stability and smoothness of the transmission shaft 2 during movement.

[0080] like Figure 2 As shown, in some embodiments of the present application, the transmission shaft 2 includes: a first shaft segment 203 and a second shaft segment 204, the first shaft segment 203 forms a limiting portion 41, and the first shaft segment 203 is limitedly matched with the limiting member 4, the second shaft segment 204 is connected to one end of the first shaft segment 203 in the axial direction, and the radial dimension of the second shaft segment 204 is greater than the radial dimension of the first shaft segment 203 to improve the structural strength of the second shaft segment 204.

[0081] Reference Figure 1Part of the second shaft segment 204 can extend outside the housing 1, and the end of the second shaft segment 204 can be connected to a connecting rod or other mechanism to drive the wheels. In this application, by configuring the radial dimension of the second shaft segment 204 to be larger than the radial dimension of the first shaft segment 203, the structural strength of the second shaft segment 204 can be improved, thereby enhancing the stability and reliability of the driving force output by the drive shaft 2. At the same time, the radial dimension of the hole structure in the housing 1 corresponding to the first shaft segment 203 can be reduced.

[0082] like Figure 1 As shown, in some embodiments of the present application, the transmission shaft 2 includes: a first transmission shaft 201 and a second transmission shaft 202, the first transmission shaft 201 is connected to one end of the driving screw 31, and the second transmission shaft 202 is connected to the other end of the driving screw 31. The first transmission shaft 201 and the second transmission shaft 202 are coaxially arranged with the driving screw 31.

[0083] Reference Figure 1 The first transmission shaft 201 and the second transmission shaft 202 are respectively connected to the axial ends of the driving screw 31, and the ends of the first transmission shaft 201 and the second transmission shaft 202 not connected to the driving screw 31 can extend to the outside of the shell 1 to output driving force.

[0084] Since the first transmission shaft 201 and the second transmission shaft 202 are both connected to the driving screw 31, the driving screw 31 can drive the first transmission shaft 201 and the second transmission shaft 202 to move synchronously. Figure 1 As shown, the transmission shaft 2 located on the right side of the driving screw 31 is described as the first transmission shaft 201, and the transmission shaft 2 located on the left side of the driving screw 31 is described as the second transmission shaft 202. When the driving screw 31 moves to the right along the axial direction, it will drive the first transmission shaft 201 and the second transmission shaft 202 to move to the right synchronously, and the first transmission shaft 201 will extend outward from the shell 1, and the second transmission shaft 202 will be retracted into the shell 1; when the driving screw 31 moves to the left along the axial direction, it will drive the first transmission shaft 201 and the second transmission shaft 202 to move to the left synchronously, and the first transmission shaft 201 will be retracted into the shell 1, and the second transmission shaft 202 will extend outward from the shell 1. The above-mentioned "right" and "left" are Figure 1 left and right directions.

[0085] In some embodiments of the present application, the limiting member 4 is limitedly matched with the first transmission shaft 201 or the second transmission shaft 202 to limit the rotation of the first transmission shaft 201, the second transmission shaft 202 and the driving screw 31 through the limiting member 4. It can be understood that the first transmission shaft 201 and the second transmission shaft 202 are both connected to the driving screw 31. When one of the first transmission shaft 201 and the second transmission shaft 202 is limitedly matched with the limiting member 4, the rotation of the first transmission shaft 201, the second transmission shaft 202 and the driving screw 31 can be limited at the same time. In other words, it is sufficient to form a limiting portion 41 on one of the first transmission shaft 201 and the second transmission shaft 202, refer to Figure 1 The first transmission shaft 201 is provided with a limiting portion 41, and the limiting member 4 is limitedly cooperated with the first transmission shaft 201. The second transmission shaft 202 is not provided with a limiting structure. Only through the limiting cooperation between the first transmission shaft 201 and the limiting member 4, the first transmission shaft 201, the second transmission shaft 202 and the driving screw 31 can be moved in the axial direction, and the structures of the first transmission shaft 201 and the second transmission shaft 202 can be different.

[0086] In other embodiments of the present application, there are two limiting members 4, and the two limiting members 4 are respectively cooperated with the first transmission shaft 201 and the second transmission shaft 202 to further enhance the rotation limiting effect of the first transmission shaft 201 and the second transmission shaft 202, and the first transmission shaft 201 and the second transmission shaft 202 have the same structure.

[0087] like Figure 1 As shown, in some embodiments of the present application, the rear-wheel steering mechanism 100 further includes a support bearing 5, which is arranged at the shaft hole in the housing 1 and sleeved on the transmission shaft 2. The support bearing 5 is arranged between the transmission shaft 2 and the wall of the shaft hole, and can support the transmission shaft 2, thereby improving the stability and reliability of the transmission shaft 2 during movement.

[0088] Reference Figure 1 The rear-wheel steering mechanism 100 is provided with a first transmission shaft 201 and a second transmission shaft 202. Two support bearings 5 ​​are provided, each sleeved on the first transmission shaft 201 and the second transmission shaft 202 to improve the movement stability of the first transmission shaft 201 and the second transmission shaft 202. The first transmission shaft 201 includes a first shaft section 203 and a second shaft section 204, and the support bearing 5 sleeved on the second shaft section 204.

[0089] In some embodiments of the present application, one of the transmission shaft 2 (e.g., the first transmission shaft 201 and the second transmission shaft 202) and the drive screw 31 is provided with a threaded connection section at its end in the axial direction, and the other is provided with a threaded hole, and the threaded hole is threadedly engaged with the threaded connection section to connect the transmission shaft 2 to the drive screw 31. For example, when the end of the transmission shaft 2 is provided with a threaded connection section, the end of the drive screw 31 is formed with a threaded hole; when the end of the drive screw 31 is provided with a threaded connection section, the end of the transmission shaft 2 is formed with a threaded hole.

[0090] like Figure 6 As shown, in some embodiments of the present application, the housing 1 is provided with a slide groove 11, which extends along the axial direction of the driving screw 31. The rear wheel steering mechanism 100 also includes a slider 6, which is connected to the driving screw 31. The slider 6 is arranged in the slide groove 11, and the slider 6 can move synchronously with the driving screw 31 relative to the housing 1 to slide in the slide groove 11.

[0091] The slider 6 is fixedly connected to the driving screw 31 so as to move synchronously with the driving screw 31 relative to the housing 1. Figure 6 The slider 6 can be connected to the drive screw 31 through a pin structure, and the pin structure can be specifically constructed as a cylindrical pin 7. It should be noted that the connection method between the slider 6 and the drive screw 31 is not limited to this, and the slider 6 can also be integrated on the drive screw 31.

[0092] It can be understood that a displacement sensor can be provided in the steering device of the vehicle, and the displacement sensor can detect the displacement of the slider 6 relative to the initial position, thereby obtaining the position information of the slider 6. According to the position information of the slider 6, the positions of the first transmission shaft 201, the second transmission shaft 202 and the driving screw 31 relative to the housing 1 can be indirectly fed back.

[0093] like Figure 6 As shown, in some embodiments of the present application, the cylindrical pin 7 is plugged into the slider 6, and a sealing groove 71 is formed on the outer wall of the cylindrical pin 6. A sealing member 72 is provided in the sealing groove 71. The sealing member 72 is clamped between the cylindrical pin 7 and the slider 6 to improve the sealing performance of the fitting between the cylindrical pin 7 and the slider 6.

[0094] like Figure 6 As shown, in a further embodiment of the present application, the slider 6 is matched with the wall clearance of the slide groove 11, so that there is a certain amount of gap between the slider 6 and the wall of the slide groove 11, so that the wall slider 6 is in surface contact with the slide groove 11, so that there is no friction between the slider 6 and the slide groove 11, making the movement of the transmission shaft 2 and the drive screw 31 smoother.

[0095] In related art, rear-wheel steering devices employ a radially extending projection on the output shaft. This projection cooperates with a retaining groove in the housing 1 to limit the rotation of the output shaft. To ensure effective output shaft restraint, the projection and retaining groove form an interference fit, resulting in significant resistance to axial movement of the output shaft.

[0096] In this application, the slider 6 serves to mark the position of the drive screw 31 relative to the housing 1. By detecting the position of the slider 6, the displacement information of the drive screw 31 can be obtained. In other words, the slider 6 in this application has a different function from the above-mentioned bump. It can be used to match the slider 6 with the slot 11 to improve the smoothness of the movement of the transmission shaft 2.

[0097] like Figure 1 As shown, in some embodiments of the present application, the rear-wheel steering mechanism 100 further includes a drive device 8 and a transmission assembly 9. The drive device 8 is mounted on the housing 1 and is used to output a driving force. The transmission assembly 9 is used to transmit the driving force output by the drive device 8 to the drive sleeve 32, thereby driving the drive sleeve 32 to rotate. The drive sleeve 32 is threadedly engaged with the drive screw 31 to drive the transmission shaft 2 in the axial direction.

[0098] The driving device 8 may be configured as a driving motor, which is mounted on the outer wall of the housing 1 and is used for power connection with the transmission assembly 9 to output driving force to the transmission assembly 9 .

[0099] Reference Figure 1 The axial direction of the driving shaft of the driving motor is set parallel to the axial direction of the driving screw 31.

[0100] In some embodiments of the present application, the transmission assembly 9 includes a transmission wheel 91 and a transmission belt 92. The transmission wheel 91 is connected to the driving device 8, and the driving device 8 can drive the transmission wheel to rotate. The transmission belt 92 is sleeved on the transmission wheel 91 and the driving sleeve 32. The transmission belt 92 is used to transmit the driving force of the transmission wheel 91 to the driving sleeve 32 to drive the driving sleeve 32 to rotate, and the driving sleeve 32 is threadedly engaged with the driving screw 31 to further drive the transmission shaft 2 to move.

[0101] When the driving device 8 is configured as a driving motor, the transmission wheel 91 is connected to the motor shaft of the driving motor so as to drive the transmission wheel 91 to rotate via the motor shaft.

[0102] It should be noted that the transmission assembly 9 is a transmission structure that is dynamically connected between the drive device 8 and the drive sleeve 32. The specific structure is not limited to belt drive. In other embodiments, the transmission assembly 9 can also drive the drive sleeve 32 to rotate by means of gear transmission. For example, the transmission assembly 9 includes a drive gear that is connected to the drive device 8 (e.g., a drive motor). The drive gear can be driven to rotate by the drive device 8. The outer peripheral wall of the drive sleeve 32 is provided with external teeth that can mesh with the drive gear. Therefore, the drive gear can drive the drive sleeve 32 to rotate, and the drive sleeve 32 can then cooperate with the drive screw 31 to drive the transmission shaft 2 to move.

[0103] Reference Figure 1 The driving process of the transmission shaft 2 of the rear-wheel steering mechanism 100 according to the embodiment of the present application is described as follows:

[0104] The driving device 8 outputs driving force and transmits the driving force to the driving sleeve 32 through the transmission belt to drive the driving sleeve 32 to rotate, and the driving sleeve 32 is threadedly matched with the driving screw 31, so that the driving screw 31 can drive the transmission shaft 2 to move linearly along the axial direction.

[0105] It can be understood that by controlling the power output direction of the driving device 8, the transmission shaft 2 can be made to reciprocate in the axial direction.

[0106] According to an embodiment of the present application, the vehicle includes the aforementioned rear-wheel steering mechanism 100. The rear-wheel steering mechanism 100 drives the transmission shaft 2 via the drive screw assembly 3, and the limiter 4 limits the transmission shaft 2, thereby preventing the transmission shaft 2 from rotating. The mechanism further limits the rotation of the drive screw 31, allowing the drive screw 31 to move linearly relative to the housing 1 and drive the transmission shaft 2 connected thereto to move axially. This improves the reliability and stability of the rear-wheel steering mechanism 100 in adjusting the vehicle's rear wheel steering.

[0107] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0108] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0109] In the description of this application, “plurality” means two or more.

[0110] In the description of the present application, a first feature being “on” or “under” a second feature may include the first and second features being in direct contact with each other, or the first and second features being in contact with each other not directly but via another feature therebetween.

[0111] In the description of this application, a first feature “on”, “above” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0112] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0113] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A rear wheel steering mechanism, characterized in that: include: Housing (1); A transmission shaft (2), the transmission shaft (2) being mounted on the housing (1) and being used to be connected to a driving screw assembly (3); A limit member (4), the limit member (4) being mounted on the housing (1) and sleeved on the outer circumference of the transmission shaft (2), the limit member (4) being in limited cooperation with the transmission shaft (2) to limit the rotation of the transmission shaft (2) around its central axis, and the transmission shaft (2) being movable relative to the limit member (4) along the axial direction of the transmission shaft (2).

2. The rear wheel steering mechanism according to claim 1, characterized in that: The limiting member (4) is constructed as a limiting sleeve, the limiting sleeve is sleeved on the transmission shaft (2), and the inner peripheral wall of the limiting sleeve is provided with a limiting portion (41); The outer peripheral wall of the transmission shaft (2) is provided with a position-limiting matching portion (21), and the position-limiting portion (41) is position-limitingly matched with the position-limiting matching portion (21).

3. The rear wheel steering mechanism according to claim 2, characterized in that: The limiting portion (41) is provided with a limiting surface (411), the limiting matching portion (21) is constructed as a limiting matching surface, and the limiting surface (411) is limitedly matched with the limiting matching surface.

4. The rear wheel steering mechanism according to claim 3, characterized in that: The limiting surface (411) is a plane, and the plane is arranged parallel to the axial direction of the transmission shaft (2); The limiting matching surface is a plane and fits closely with the limiting surface (411).

5. The rear wheel steering mechanism according to claim 3, characterized in that: At least one of the limiting surface (411) and the limiting matching surface is provided with a friction-reducing coating.

6. The rear wheel steering mechanism according to claim 3, characterized in that: The limiting portion (41) is provided with a through groove (412), and the through groove (412) is recessed from the limiting surface (411) along the radial direction of the transmission shaft (2) to a side away from the transmission shaft (2), so as to form a communication channel between the transmission shaft (2) and the limiting member (4).

7. The rear wheel steering mechanism according to claim 6, characterized in that: The extending direction of the through groove (412) is parallel to the axial direction of the transmission shaft (2).

8. The rear wheel steering mechanism according to claim 7, characterized in that: In the projection of the through groove (412) in the extension direction, the through groove (412) is arranged in the middle of the limiting surface (411); And / or, in a projection of the through groove (412) in the extension direction, the groove wall of the through groove (412) extends in an arc shape and is configured as an arc surface.

9. The rear wheel steering mechanism according to claim 3, characterized in that: There are a plurality of the limiting surfaces (411), and the plurality of limiting surfaces (411) are arranged in the circumferential direction of the inner peripheral wall of the limiting sleeve.

10. The rear wheel steering mechanism according to claim 3, characterized in that: The transmission shaft (2) comprises: a first shaft section (203), wherein the first shaft section (203) forms the limiting portion (41) and cooperates with the limiting member (4) in limiting manner.

11. The rear wheel steering mechanism according to claim 10, characterized in that: The transmission shaft (2) further comprises: a second shaft segment (204), wherein the second shaft segment (204) is connected to one end of the first shaft segment (203) in the axial direction, and the radial dimension of the second shaft segment (204) is greater than the radial dimension of the first shaft segment (203).

12. The rear wheel steering mechanism according to claim 2, characterized in that: The outer peripheral wall of the limiting sleeve is provided with an external spline (414), the shell (1) is provided with an internal spline, and the limiting sleeve and the shell (1) spline cooperate to limit the rotation of the limiting sleeve relative to the shell (1).

13. The rear wheel steering mechanism according to claim 1, characterized in that: The driving screw assembly (3) comprises: A driving screw rod (31), the driving screw rod (31) is connected to the transmission shaft (2) and is used to drive the transmission shaft (2) to move synchronously; A drive sleeve (32), wherein the drive sleeve (32) is threadably matched with the drive screw rod (31) and is used to drive the drive screw rod (31) to move in an axial direction.

14. The rear wheel steering mechanism according to claim 13, characterized in that: The transmission shaft (2) comprises: A first transmission shaft (201), the first transmission shaft (201) being connected to one end of the driving screw rod (31); A second transmission shaft (202), the second transmission shaft (202) being connected to the other end of the driving screw rod (31); Wherein, the first transmission shaft (201), the second transmission shaft (202) and the driving screw rod (31) are coaxially arranged.

15. The rear wheel steering mechanism according to claim 14, characterized in that: The limiting member (4) is in limiting cooperation with the first transmission shaft (201) or the second transmission shaft (202); Alternatively, there are two limit members (4), and the two limit members (4) are respectively limitedly matched with the first transmission shaft (201) and the second transmission shaft (202).

16. The rear wheel steering mechanism according to claim 14, characterized in that: The housing (1) is provided with a slide groove (11), and the slide groove (11) extends along the axial direction of the driving screw rod (31); The rear wheel steering mechanism further comprises a slider (6), the slider (6) being connected to the driving screw rod (31), and the slider (6) being arranged in the sliding groove (11) and being adapted to move synchronously with the driving screw rod (31) relative to the housing (1).

17. The rear wheel steering mechanism according to claim 16, characterized in that: The sliding block (6) is clearance-matched with the wall surface of the sliding groove (11).

18. The rear wheel steering mechanism according to claim 14, characterized in that: Also includes: A driving device (8), wherein the driving device (8) is mounted on the housing (1) and is used to drive the driving sleeve (32) to rotate.

19. The rear wheel steering mechanism according to claim 18, characterized in that: It also includes a transmission assembly (9), wherein the transmission assembly (9) includes: A transmission wheel (91), wherein the transmission wheel (91) is connected to the driving device (8); A transmission belt (92), wherein the transmission belt (92) is used to connect the transmission wheel (91) and the drive sleeve (32), and the transmission wheel (91) can drive the drive sleeve (32) to rotate through the transmission belt (92).

20. A vehicle, characterized in that: Comprising a rear wheel steering mechanism as claimed in any one of claims 1-19.

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