Bearing and steering device

Abstract

The utility model discloses a bearing and a steering device, and belongs to the technical field of steering devices. At least part of the inner ring part is arranged on the inner circumferential side of the outer ring part, the inner ring part is rotationally connected with the outer ring part, and the inner circumferential surface of the inner ring part is provided with a non-circular cross section and is used for being matched with a linear moving piece matched with the outline of the cross section of the outer circumferential surface so as to allow the linear moving piece to move in the axial direction of the linear moving piece and limit the linear moving piece to rotate around the axis of the linear moving piece; the first limiting part is connected with the inner ring part and the outer ring part, and the first limiting part is configured to limit the inner ring part to rotate around the first axis relative to the outer ring part. The bearing provides radial support and limits rotation of the linear moving part in the moving process of the linear moving part, meanwhile, the bearing adapts to deformation of the linear moving part so as to keep good contact with the linear moving part, the problem that the linear moving part is stuck due to stress concentration is solved, and the linear driving stability of the linear moving part is improved.

Description

Technical Field

[0001] This application belongs to the field of steering device technology, specifically relating to a bearing and a steering device. Background Technology

[0002] In traditional automotive steering systems, the steering wheel and steering gear are mechanically connected via a shaft system. With the development of steer-by-wire technology, this mechanical connection between the steering gear and the steering wheel is no longer necessary. However, steering gears that apply steering torque through the linear movement of a lead screw lack a restraining structure to counteract the lead screw's rotation, necessitating the design of additional restraining structures to improve the stability of the lead screw's movement. Utility Model Content

[0003] The purpose of this utility model is to provide a bearing to solve the above-mentioned technical problems; another purpose of this application is to provide a steering device that uses the above-mentioned bearing.

[0004] Technical solution: A bearing as described in the embodiments of this application includes:

[0005] Outer ring;

[0006] An inner ring portion, at least partially disposed on the inner circumferential side of the outer ring portion, is rotatably connected to the outer ring portion. The inner circumferential surface of the inner ring portion has a non-circular cross-section for engaging with a linear moving member adapted to the cross-sectional profile of the outer circumferential surface, thereby allowing the linear moving member to move along its own axial direction and restricting the linear moving member from rotating around its own axis.

[0007] A first limiting portion connects the inner ring portion and the outer ring portion, and the first limiting portion is configured to restrict the inner ring portion from rotating relative to the outer ring portion around a first axis.

[0008] In some embodiments, the first limiting portion is fixedly connected to the inner ring portion, the outer ring portion has a limiting hole, the first limiting portion passes through the limiting hole, the first limiting portion has a second axis, the extension direction of the second axis intersects the extension direction of the first axis, the first limiting portion can swing around the second axis within a predetermined angle range in the limiting hole, and the hole wall of the limiting hole restricts the inner ring portion from rotating around the first axis relative to the outer ring portion.

[0009] In some embodiments, the inner ring portion has a third axis, wherein the first axis, the second axis, and the third axis intersect each other;

[0010] The opening size of the limiting hole is larger than the size of the first limiting portion, so as to allow the inner ring portion to swing relative to the outer ring portion about the third axis within a predetermined angle range. In some embodiments, the inner ring portion is provided with the first limiting portion on both opposite sides in the extension direction of the second axis, and the outer ring portion is provided with the limiting hole for each of the first limiting portions.

[0011] Accordingly, the steering device described in this application embodiment includes the aforementioned bearing, and further includes:

[0012] A linear moving member for connecting a wheel and configured to move along its own axis to drive the wheel to deflect; an inner ring is fitted onto the linear moving member, the inner circumferential surface of the inner ring and the outer circumferential surface of the linear moving member having a non-circular cross-section with a matching profile to allow the linear moving member to move along its own axis and restrict the linear moving member to rotate about its own axis.

[0013] A first limiting portion connects the inner ring portion and the outer ring portion, and the first limiting portion is configured to restrict the inner ring portion from rotating around the first axis.

[0014] In some embodiments, the inner circumferential side of the inner ring portion is provided with a first mating portion, and the linear moving member is provided with a second mating portion that contacts the first mating portion. The first mating portion and the second mating portion are configured to engage and guide the linear moving member to move along its own axial direction, and the first mating portion is configured to restrict the second mating portion from rotating around the linear moving member's own axis.

[0015] In some embodiments, in response to the linear moving member moving along its own axial direction, a sliding support or a rolling support is formed between the first mating portion and the second mating portion.

[0016] In some embodiments, the first mating portion includes a sliding bushing with an axial stop, the sliding bushing being snapped onto the inner circumferential side of the inner ring portion by the axial stop, and the sliding bushing being fitted against the second mating portion.

[0017] In some embodiments, the first mating portion further includes an elastic element disposed between the sliding bushing and the inner peripheral side of the inner ring portion, so that the second mating portion fits against the sliding bushing.

[0018] In some embodiments, the first mating portion is provided in multiple ways, and the multiple first mating portions are circumferentially distributed around the first axis.

[0019] Beneficial Effects: A bearing according to an embodiment of this application includes an outer ring portion, an inner ring portion, and a first limiting portion. The inner ring portion is at least partially disposed on the inner circumferential side of the outer ring portion, and is rotatably connected to the outer ring portion. The inner circumferential surface of the inner ring portion has a non-circular cross-section for engaging with a linear moving member whose cross-sectional profile is adapted to the outer circumferential surface, thereby allowing the linear moving member to move along its own axial direction and restricting the linear moving member from rotating around its own axis. The first limiting portion connects the inner ring portion and the outer ring portion, and is configured to restrict the inner ring portion from rotating relative to the outer ring portion around a first axis. The inner ring portion and the outer ring portion provide radial support during the linear moving member's axial movement. Relying on the rotatable connection of the inner ring portion to the outer ring portion, when the linear moving member is subjected to force and bends, the inner ring portion can swing relative to the outer ring portion to adapt to the deformation of the linear moving member, thereby maintaining good contact between the linear moving member and the inner ring portion, which helps to reduce the problem of the linear moving member jamming due to stress concentration. The inner ring can restrict the linear moving part from rotating around its own axis, while the first limiting part restricts the inner ring from rotating around the first axis relative to the outer ring, thereby further restricting the rotation of the linear moving part and improving the stability of the linear driving of the linear moving part. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a cross-sectional structural schematic diagram of the steering device according to an embodiment of this application;

[0022] Figure 2 This is a partial cross-sectional view of the steering device according to an embodiment of this application;

[0023] Figure 3 This is a schematic diagram of the bearing structure according to an embodiment of this application;

[0024] Figure 4 This is an exploded structural diagram of the bearing according to an embodiment of this application;

[0025] Figure 5 This is a cross-sectional structural schematic diagram of the bearing and linear moving part from one perspective of an embodiment of this application;

[0026] Figure 6 This is a cross-sectional structural schematic diagram of the bearing and linear moving part from another perspective in the embodiments of this application;

[0027] Figure 7 This is a schematic diagram of the state of the linear moving part and the inner ring relative to the outer ring in an embodiment of this application;

[0028] Reference numerals: 1. Housing; 10. Receiving cavity; 11. Limiting groove; 12. Second limiting part; 2. Linear moving part; 20. Threaded section; 21. Moving section; 23. Second mating part; 3. Bearing; 30. Outer ring part; 300. Limiting hole; 301. Protrusion; 302. Ball seat; 3020. Spherical profile; 31. Inner ring part; 310. Groove; 311. Assembly plane; 312. First axis; 313. Third axis; 32. First limiting part; 320. Bearing component; 321. Second axis; 33. First mating part; 330. Sliding bushing; 3300. Main body; 3301. Axial stop; 331. Elastic element; 4. Drive assembly; 40. Drive component; 41. Transmission group; 5. Transmission nut. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0030] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified.

[0031] Currently, vehicle steering systems generally connect the steering wheel and steering gear mechanically via a shaft system. Taking a ball screw electronic power steering system as an example, it typically includes a rack and pinion mechanism and a ball screw mechanism. The rack and pinion mechanism serves two purposes: firstly, it connects the steering wheel and steering gear, and secondly, it restrains the rotation of the ball screw, thus ensuring that the ball screw moves linearly along its own axis to output steering force.

[0032] With the development of steer-by-wire technology, the steer-by-wire system no longer needs a mechanical connection to the steering wheel, thus eliminating the need for a rack and pinion mechanism. Therefore, it is essential to design additional limiting structures to restrict the rotation of the lead screw, thereby improving the stability of its linear movement.

[0033] In view of this, refer to Figures 1 to 7 This application provides a bearing and a steering device, which are intended to overcome at least one of the above-mentioned technical problems.

[0034] Reference Figures 1 to 7 A steering device includes a housing 1, a linear moving member 2, and a bearing 3. At least a portion of the linear moving member 2 is disposed within the housing 1. The linear moving member 2 is used to connect a wheel and is configured to move axially to drive the wheel to deflect. The bearing 3 includes an outer ring portion 30, an inner ring portion 31, and a first limiting portion 32.

[0035] The outer ring portion 30 is fixed to the housing 1, and at least a portion of the inner ring portion 31 is disposed on the inner circumferential side of the outer ring portion 30, with the inner ring portion 31 rotatably connected to the outer ring portion 30. The inner ring portion 31 is sleeved on the linear moving member 2, and the inner circumferential surface of the inner ring portion 31 and the outer circumferential surface of the linear moving member 2 have non-circular cross-sections that are adapted to each other to allow the linear moving member 2 to move along its own axial direction and restrict the linear moving member 2 to rotate around its own axis. A first limiting portion 32 connects the inner ring portion 31 and the outer ring portion 30, and the first limiting portion 32 is configured to restrict the inner ring portion 31 to rotate around a first axis 312. The first axis 312 coincides with the axis of the linear moving member 2.

[0036] The inner ring portion 31 and the outer ring portion 30 provide radial support during the axial movement of the linear moving member 2. The inner ring portion 31 rotatably connects to the outer ring portion 30. When the linear moving member 2 is subjected to force and bends, the inner ring portion 31 can swing relative to the outer ring portion 30 to accommodate the deformation of the linear moving member 2, thereby maintaining good contact between the linear moving member 2 and the inner ring portion 31. This helps reduce the problem of stress concentration causing the linear moving member 2 to jam. The inner ring portion 31 can restrict the rotation of the linear moving member 2 around its own axis, while the first limiting portion 32 restricts the inner ring portion 31 from rotating relative to the outer ring portion 30 around the first axis 312, thereby further restricting the rotation of the linear moving member 2 and improving the stability of the linear drive of the linear moving member 2.

[0037] It should be noted that, referring to Figure 1 In this embodiment, the housing 1 has a receiving cavity 10, and the bearing 3 and the linear moving member 2 are respectively assembled in the receiving cavity 10. The linear moving member 2 includes a threaded section 20 and a moving section 21 connected along its own axial direction, and the inner ring portion 31 is sleeved on the moving section 21 to form radial support for the linear moving member 2.

[0038] In some embodiments, refer to Figure 1The steering device also includes a drive assembly 4 and a transmission nut 5. The drive assembly 4 is connected to the housing 1 and drives the transmission nut 5. The transmission nut 5 is sleeved on and engages with the threaded section 20. The drive assembly 4 is configured to drive the transmission nut 5 to rotate around the axis of the threaded section 20, thereby causing the threaded section 20 to move along its own axial direction.

[0039] Specifically, the drive assembly 4 includes a drive component 40 and a transmission assembly 41. The drive component 40 can be a motor, and it is fixed to the housing 1. The transmission assembly 41 can use a pulley drive structure to connect the drive component 40 and the transmission nut 5, so that the drive component 40 can drive the transmission nut 5 to rotate, thereby driving the overall linear moving component 2 to move along its own axial direction. The transmission principle of the pulley assembly is existing technology and will not be described in detail here.

[0040] In some embodiments, refer to Figures 1 to 3 To secure the outer ring portion 30: Firstly, the inner wall of the receiving cavity 10 abuts against one axial end of the outer ring portion 30 on the linear moving member 2. A second limiting portion 12 is also provided within the receiving cavity 10. The second limiting portion 12 can be installed into the receiving cavity 10 after the bearing 3 is inserted. The second limiting portion 12 locks the housing 1 and abuts against the other axial end of the outer ring portion 30 on the linear moving member 2, thereby securing the outer ring portion 30. The second limiting portion 12 can be connected to the housing 1 by means of threaded connection or other methods, which will not be elaborated further here.

[0041] On the other hand, refer to Figure 2 The outer ring portion 30 has a protrusion 301 on its outer periphery, and the cavity wall of the receiving cavity 10 has a limiting groove 11. After the bearing 3 is inserted into the receiving cavity 10 from one end of the housing 1, the protrusion 301 is inserted into the corresponding limiting groove 11, that is, the rotation of the protrusion 301 is restricted by the limiting groove 11, thereby restricting the rotation of the outer ring portion 30. In this embodiment, the protrusion 301 can be integrally formed with the outer ring portion 30, and there are two protrusions 301 distributed circumferentially around the outer periphery of the outer ring portion 30. In other embodiments, the number of protrusions 301 and the number of corresponding limiting grooves 11 can be flexibly increased or decreased as needed.

[0042] In some embodiments, refer to Figures 3 to 6 The outer ring portion 30 is also provided with a ball seat 302 on the side facing the inner ring portion 31. The ball seat 302 and the outer periphery of the inner ring portion 31 cooperate to form a spherical hinge mechanism, allowing the inner ring portion 31 to rotate relative to the outer ring portion 30 while still bearing radial or partial axial forces from the linear moving member 2. (Synchronous reference) Figure 7 The inner ring 31 can rotate within the spherical profile 3020 by means of the ball seat 302 structure within the outer ring 30.

[0043] In some embodiments, refer to Figures 3 to 7The first limiting part 32 is fixedly connected to the inner ring part 31. The first limiting part 32 can be configured as a cylindrical pin structure. The first limiting part 32 has a second axis 321, the extension direction of which intersects the extension direction of the first axis 312. The outer ring part 30 has a limiting hole 300, and the first limiting part 32 passes through the limiting hole 300. The first limiting part 32 can rotate around the second axis 321 in the limiting hole 300, that is, the first limiting part 32 can swing within a predetermined angle range around the second axis 321 in the limiting hole 300. At the same time, the hole wall of the limiting hole 300 restricts the first limiting part 32 from rotating around the first axis 312. The inner ring part 31 is restricted from rotating around the first axis 312 by the cooperation of the first limiting part 32 and the limiting hole 300, while ensuring that the inner ring part 31 can rotate around the second axis 321.

[0044] It should be noted that in this embodiment, the limiting hole 300 is located at the position of the protrusion 301, that is, the protrusion 301 surrounds the limiting hole 300. In the outer ring portion 30 structure with the same wall thickness, the protrusion height of the protrusion 301 can be regarded as an extension of the hole wall of the limiting hole 300, thereby allowing the first limiting portion 32 to extend, avoiding the need to additionally thicken the wall thickness of the outer ring portion 30 for the first limiting portion 32 to pass through stably.

[0045] In some embodiments, refer to Figure 3 , Figure 5 and Figure 7 The inner ring portion 31 has a third axis 313, and the first axis 312, the second axis 321, and the third axis 313 intersect each other. The opening size of the limiting hole 300 is larger than the size of the first limiting portion 32, allowing the inner ring portion 31 to swing relative to the outer ring portion 30 around the third axis 313 within a predetermined angle range. Relying on the spherical hinge mechanism formed between the ball seat 302 and the inner ring portion 31, the limiting hole 300 allows the first limiting portion 32 to rotate around the second axis 321, and also allows the first limiting portion 32 to swing within the limiting hole 300, meaning the corresponding inner ring portion 31 can swing as follows: Figure 7 The swing around the third axis 313 shown further improves the adaptability of the inner ring 31 to the bending deformation of the linear moving part 2.

[0046] To reduce wear between the first limiting portion 32 and the outer ring portion 30, in some embodiments, referring to... Figures 4 to 6The bearing 3 may also include a bearing element 320. The bearing element 320 is disposed within the limiting hole 300, and is sleeved on the outer periphery of the first limiting part 32, contacting the hole wall of the limiting hole 300. In the direction about the first axis 312, the two opposite hole walls of the limiting hole 300 can be configured as parallel planes, and the corresponding outer wall of the bearing element 320 can be configured as parallel planes. The bearing element 320 allows the first limiting part 32 to rotate around the second axis 321, and simultaneously allows the bearing element 320 to slide within the limiting hole 300 as the first limiting part 32 swings. The bearing element 320 increases the contact area between the first limiting part 32 and the hole wall of the limiting hole 300, which helps to protect the first limiting part 32 and reduce wear. It also facilitates the replacement of the bearing element 320 after it wears out.

[0047] To improve the rotational stability of the inner ring 31, in some embodiments, reference is made to... Figures 5 to 7 The inner ring portion 31 has a first limiting portion 32 on each of its opposite sides in the extension direction of the second axis 321, and the outer ring portion 30 has a limiting hole 300 corresponding to each first limiting portion 32. Each limiting hole 300 corresponds one-to-one with each protrusion 301. The inner ring portion 31 is guided to rotate synchronously by the two first limiting portions 32, thereby improving the stability of the rotation of the inner ring portion 31.

[0048] In some embodiments, refer to Figures 2 to 6 The inner circumference of the inner ring portion 31 is provided with a first mating portion 33, and the linear moving member 2 is provided with a second mating portion 23 that contacts the first mating portion 33. The first mating portion 33 and the second mating portion 23 are configured to engage and guide the linear moving member 2 to move along its own axial direction. The first mating portion 33 is configured to restrict the second mating portion 23 from rotating around the axis of the linear moving member 2. That is, a mating relationship with a non-circular cross-section is formed as described above.

[0049] Through the cooperation of the first mating part 33 and the second mating part 23, the linear movement of the linear moving part 2 is guaranteed while restricting its rotation. For example, the first mating part 33 and the second mating part 23 can adopt a slider-groove mating structure, a roller guide groove mating structure, or a combination of slider-groove and roller guide groove structures, etc., which can satisfy the requirement of guiding linear movement while forming an obstacle to relative rotation.

[0050] In some embodiments, in response to the linear moving member 2 moving along its own axial direction, a sliding support or a rolling support is formed between the first mating part 33 and the second mating part 23.

[0051] Specifically, an exemplary illustration illustrates the formation of a sliding support: the second mating part 23 is provided on the moving section 21, as shown in this embodiment. Figure 2 As shown, the second mating part 23 is a plane formed on the outside of the moving section 21. Correspondingly, in some embodiments, such as Figure 4 As shown, an assembly plane 311 is formed on the inner circumferential side of the inner ring portion 31. The first mating portion 33 can be the assembly plane 311. The first mating portion 33 and the second mating portion 23 are parallel to each other. The first mating portion 33 and the second mating portion 23 are in direct contact, thereby realizing the sliding connection of the moving section 21 to the inner ring portion 31.

[0052] An exemplary illustration of forming rolling support: In some embodiments, one of the first mating part 33 and the second mating part 23 may be configured as a plane, and the other may be configured as a needle roller, ball roller, or other structure. In this case, the first mating part 33 and the second mating part 23 are rolled together, thereby realizing rolling support between the moving section 21 and the inner ring 31.

[0053] Using a sliding support structure or a rolling support structure alone can simplify the structure of the first mating part 33 and the second mating part 23.

[0054] In some embodiments, taking a sliding support as an example, refer to Figures 2 to 6 The first mating part 33 includes a sliding bushing 330, which is detachably disposed on the inner circumferential side of the inner ring part 31, and the sliding bushing 330 fits into the second mating part 23.

[0055] In this embodiment, the sliding bushing 330 includes a main body 3300 and axial stops 3301 formed at both ends of the main body 3300. The main body 3300 clamps the inner ring portion 31 through the two axial stops 3301, that is, it is snapped onto the inner circumference of the inner ring portion 31 by the axial stops 3301, thereby achieving positioning and installation. The second mating portion 23 is a plane formed on the outer side of the moving section 21. The main body 3300 is parallel to the assembly plane 311 and the second mating portion 23. The sliding bushing 330 is slidably connected to the second mating portion 23, thereby achieving a sliding connection between the inner ring portion 31 and the moving section 21, while restricting the rotation of the moving section 21.

[0056] In some embodiments, refer to Figure 4 and Figure 6 The first mating part 33 also includes an elastic element 331, which is disposed between the inner circumferential side of the sliding bushing 330 and the inner ring part 31, so that the second mating part 23 can fit against the sliding bushing 330. When the second mating part 23 fits against the sliding bushing 330, the elastic element 331 can undergo elastic deformation and abut against the sliding bushing 330 and the inner ring part 31.

[0057] The elastic element 331 can recover part of its deformation when the sliding bushing 330 wears, thereby reducing the mating clearance between the sliding bushing 330 and the second mating part 23 and achieving self-adjusting mating clearance. In this embodiment, the elastic element 331 is an elastic gasket, and a groove 310 is provided on the inner circumferential side of the corresponding inner ring part 31 for the elastic element 331 to be embedded. It should be noted that in this embodiment, the sliding bushing 330 is provided with two elastic elements 331. In order to adapt to the size of the sliding bushing 330 and the force requirements, the number of elastic elements 331 and the corresponding grooves 310 can be flexibly increased or decreased as needed. In other embodiments, the elastic element 331 can also be other structural components with elastic deformation capabilities. The elastic element 331 can be made of metal, rubber, or polyurethane, etc., which will not be elaborated here.

[0058] In some embodiments, refer to Figures 3 to 6 Multiple first mating parts 33 are provided, and these multiple first mating parts 33 are circumferentially distributed around the first axis 312. In this embodiment, three first mating parts 33 are used as an example, which helps to improve the stability of guiding the sliding of the linear moving member 2 and the effect of restricting the rotation of the linear moving member 2. Taking a first mating part 33 including a sliding bushing 330 as an example, each first mating part 33 can be provided with an elastic element 331, such as... Figure 6 As shown, only one of the first mating parts 33 may include an elastic element 331, that is, the gap adjustment between multiple first mating parts 33 and corresponding second mating parts 23 can be achieved by relying solely on the elastic element 331 of one of the first mating parts 33.

[0059] Accordingly, a bearing according to an embodiment of this application is described with reference to... Figures 1 to 7 The bearing 3 includes an outer ring portion 30, an inner ring portion 31, and a first limiting portion 32.

[0060] At least a portion of the inner ring portion 31 is disposed on the inner circumferential side of the outer ring portion 30, and the inner ring portion 31 is rotatably connected to the outer ring portion 30. The inner circumferential surface of the inner ring portion 31 has a non-circular cross-section for engaging with a linear moving member 2 whose cross-sectional profile is adapted to the outer circumferential surface, so as to allow the linear moving member 2 to move along its own axial direction and restrict the linear moving member 2 to rotate around its own axis. A first limiting portion 32 connects the inner ring portion 31 and the outer ring portion 30, and the first limiting portion 32 is configured to restrict the inner ring portion 31 from rotating relative to the outer ring portion 30 around a first axis 312.

[0061] The inner ring portion 31 and the outer ring portion 30 provide radial support during the axial movement of the linear moving member 2. The inner ring portion 31 rotatably connects to the outer ring portion 30. When the linear moving member 2 is subjected to force and bends, the inner ring portion 31 can swing relative to the outer ring portion 30 to accommodate the deformation of the linear moving member 2, thereby maintaining good contact between the linear moving member 2 and the inner ring portion 31. This helps reduce the problem of stress concentration causing the linear moving member 2 to jam. The inner ring portion 31 restricts the rotation of the linear moving member 2 around its own axis, while the first limiting portion 32 restricts the inner ring portion 31 from rotating relative to the outer ring portion 30 around the first axis 312, further restricting the rotation of the linear moving member 2 and improving the linear driving stability of the linear moving member 2.

[0062] Reference Figure 2 The outer ring portion 30 has a protrusion 301 on its outer periphery. In this embodiment, the protrusion 301 can be integrally formed with the outer ring portion 30. There are two protrusions 301 and they are distributed circumferentially around the outer periphery of the outer ring portion 30.

[0063] In some embodiments, refer to Figures 3 to 6 The outer ring portion 30 is also provided with a ball seat 302 on the side facing the inner ring portion 31. The ball seat 302 and the outer periphery of the inner ring portion 31 cooperate to form a spherical hinge mechanism, allowing the inner ring portion 31 to rotate relative to the outer ring portion 30 while still bearing radial or partial axial forces from the linear moving member 2. (Synchronous reference) Figure 7 The inner ring 31 can rotate within the spherical profile 3020 by means of the ball seat 302 structure within the outer ring 30.

[0064] In some embodiments, refer to Figures 3 to 6 The first limiting part 32 is fixedly connected to the inner ring part 31. The first limiting part 32 can be configured as a cylindrical pin structure. The first limiting part 32 has a second axis 321, the extension direction of which intersects the extension direction of the first axis 312. The outer ring part 30 has a limiting hole 300, and the first limiting part 32 passes through the limiting hole 300. The first limiting part 32 can rotate around the second axis 321 in the limiting hole 300, that is, the first limiting part 32 can swing within a predetermined angle range around the second axis 321 in the limiting hole 300. At the same time, the hole wall of the limiting hole 300 restricts the first limiting part 32 from rotating around the first axis 312. The inner ring part 31 is restricted from rotating around the first axis 312 by the cooperation of the first limiting part 32 and the limiting hole 300, while ensuring that the inner ring part 31 can rotate around the second axis 321.

[0065] It should be noted that in this embodiment, the limiting hole 300 is located at the position of the protrusion 301, that is, the protrusion 301 surrounds the limiting hole 300. In the outer ring portion 30 structure with the same wall thickness, the protrusion height of the protrusion 301 can be regarded as an extension of the hole wall of the limiting hole 300, thereby allowing the first limiting portion 32 to extend, avoiding the need to additionally thicken the wall thickness of the outer ring portion 30 for the first limiting portion 32 to pass through stably.

[0066] In some embodiments, refer to Figure 3 , Figure 5 and Figure 7 The inner ring portion 31 has a third axis 313, and the first axis 312, the second axis 321, and the third axis 313 intersect each other. The opening size of the limiting hole 300 is larger than the size of the first limiting portion 32, allowing the inner ring portion 31 to swing relative to the outer ring portion 30 around the third axis 313 within a predetermined angle range. Relying on the spherical hinge mechanism formed between the ball seat 302 and the inner ring portion 31, the limiting hole 300 allows the first limiting portion 32 to rotate around the second axis 321, and also allows the first limiting portion 32 to swing within the limiting hole 300, meaning the corresponding inner ring portion 31 can swing as follows: Figure 7 The swing around the third axis 313 shown further improves the adaptability of the inner ring 31 to the bending deformation of the linear moving part 2.

[0067] To reduce wear between the first limiting portion 32 and the outer ring portion 30, in some embodiments, referring to... Figures 4 to 6 The bearing 3 may also include a bearing element 320. The bearing element 320 is disposed within the limiting hole 300, and is sleeved on the outer periphery of the first limiting part 32, contacting the hole wall of the limiting hole 300. In the direction about the first axis 312, the two opposite hole walls of the limiting hole 300 can be configured as parallel planes, and the corresponding outer wall of the bearing element 320 can be configured as parallel planes. The bearing element 320 allows the first limiting part 32 to rotate around the second axis 321, and simultaneously allows the bearing element 320 to slide within the limiting hole 300 as the first limiting part 32 swings. The bearing element 320 increases the contact area between the first limiting part 32 and the hole wall of the limiting hole 300, which helps to protect the first limiting part 32 and reduce wear. It also facilitates the replacement of the bearing element 320 after it wears out.

[0068] To improve the rotational stability of the inner ring 31, in some embodiments, reference is made to... Figures 5 to 7 The inner ring portion 31 has a first limiting portion 32 on each of its opposite sides in the extension direction of the second axis 321, and the outer ring portion 30 has a limiting hole 300 corresponding to each first limiting portion 32. Each limiting hole 300 corresponds one-to-one with each protrusion 301. The inner ring portion 31 is guided to rotate synchronously by the two first limiting portions 32, thereby improving the stability of the rotation of the inner ring portion 31.

[0069] The foregoing has provided a detailed description of a bearing and steering device provided in the embodiments of this application, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A bearing, characterized in that, include: Outer ring (30); An inner ring (31) is at least partially disposed on the inner circumferential side of the outer ring (30). The inner ring (31) is rotatably connected to the outer ring (30). The inner circumferential surface of the inner ring (31) has a non-circular cross-section for cooperating with a linear moving member (2) that is adapted to the cross-sectional profile of the outer circumferential surface, so as to allow the linear moving member (2) to move along its own axis and restrict the linear moving member (2) to rotate around its own axis. A first limiting part (32) connects the inner ring part (31) and the outer ring part (30), and the first limiting part (32) is configured to restrict the inner ring part (31) from rotating about a first axis (312) relative to the outer ring part (30).

2. The bearing according to claim 1, characterized in that, The first limiting part (32) is fixedly connected to the inner ring part (31), and the outer ring part (30) has a limiting hole (300). The first limiting part (32) passes through the limiting hole (300). The first limiting part (32) has a second axis (321). The extension direction of the second axis (321) intersects the extension direction of the first axis (312). The first limiting part (32) can swing around the second axis (321) within a predetermined angle range in the limiting hole (300), and the hole wall of the limiting hole (300) restricts the inner ring part (31) from rotating around the first axis (312) relative to the outer ring part (30).

3. The bearing according to claim 2, characterized in that, The inner ring portion (31) has a third axis (313), and the first axis (312), the second axis (321) and the third axis (313) intersect each other; The opening size of the limiting hole (300) is larger than the size of the first limiting part (32) so as to allow the inner ring part (31) to swing relative to the outer ring part (30) about the third axis (313) within a predetermined angle range.

4. The bearing according to claim 2, characterized in that, The inner ring portion (31) is provided with the first limiting portion (32) on both sides of the extension direction of the second axis (321), and the outer ring portion (30) is provided with the limiting hole (300) corresponding to each of the first limiting portions (32).

5. A steering device, characterized in that, The bearing, as described in any one of claims 1 to 4, further comprises: A linear moving member (2) is used to connect a wheel and is configured to move along its own axis to drive the wheel to deflect; an inner ring (31) is fitted onto the linear moving member (2), the inner circumferential surface of the inner ring (31) and the outer circumferential surface of the linear moving member (2) having a non-circular cross-section that matches the profile, so as to allow the linear moving member (2) to move along its own axis and restrict the linear moving member (2) from rotating around its own axis; A first limiting part (32) connects the inner ring part (31) and the outer ring part (30), and the first limiting part (32) is configured to restrict the inner ring part (31) from rotating around the first axis (312).

6. The steering device according to claim 5, characterized in that, The inner circumferential side of the inner ring (31) is provided with a first mating part (33), and the linear moving member (2) is provided with a second mating part (23) that contacts the first mating part (33). The first mating part (33) and the second mating part (23) are configured to cooperate and guide the linear moving member (2) to move along its own axis, and the first mating part (33) is configured to restrict the second mating part (23) from rotating around the axis of the linear moving member (2).

7. The steering device according to claim 6, characterized in that, In response to the linear moving member (2) moving along its own axial direction, a sliding support or a rolling support is formed between the first mating part (33) and the second mating part (23).

8. The steering device according to claim 7, characterized in that, The first mating part (33) includes a sliding bushing (330) with an axial stop (3301), the sliding bushing (330) being snapped onto the inner circumferential side of the inner ring part (31) by the axial stop (3301), and the sliding bushing (330) fitting against the second mating part (23).

9. The steering device according to claim 8, characterized in that, The first mating part (33) further includes an elastic element (331), which is disposed between the sliding bushing (330) and the inner circumferential side of the inner ring part (31) so that the second mating part (23) fits against the sliding bushing (330).

10. The steering device according to claim 6, characterized in that, The first mating part (33) is provided in multiple ways, and the multiple first mating parts (33) are distributed circumferentially around the first axis (312).

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