Swing bearing, steering system and vehicle

Abstract

The utility model discloses a swing bearing, a steering system and a vehicle, and belongs to the technical field of automobiles. The swing bearing comprises an inner bearing, an inner swing shell and an outer fixing shell, an inner ring of the inner bearing can rotate around a first axis relative to an outer ring, the inner swing shell is fixed to the outer side of the outer ring in a sleeving mode, and the inner swing shell can swing around a second axis relative to the outer fixing shell within a preset angle range so that the swing function of the swing bearing can be achieved; a part of the outer wall of the inner swing shell abuts against and is matched with a part of the inner wall of the outer fixed shell in the extending direction of the first axis, and therefore the axial loading capacity and stability of the swing bearing can be improved.

Description

Technical Field

[0001] The utility model relates to the field of automobiles, in particular to a swing bearing, a steering system and a vehicle. Background Art

[0002] Most vehicles today are equipped with electric power steering systems, which usually use a worm gear transmission mechanism for transmission. The transmission mechanism meshing clearance is mainly caused by part tolerances, thermal expansion and contraction of parts, wear or creep of plastic gear materials. The transmission mechanism meshing clearance will result in the gears being unable to reach the ideal meshing position during transmission, and will produce abnormal noises when the tooth surfaces collide alternately.

[0003] The commonly used method to eliminate the clearance of the transmission mechanism is as follows: a swing bearing or a self-aligning bearing is used to support one end of the worm shaft, and one or more spring elements are used to squeeze the other end toward the worm wheel to eliminate the clearance.

[0004] Among them, the outer ring of the traditional swing bearing is processed into an outer spherical shape, and there is a fixed ring outside this outer ring. The inner hole of this fixed ring is processed into an inner spherical shape. The inner spherical surface of the fixed ring matches the outer spherical surface of the outer ring. The bearing can move along the spherical surface in this fixed ring, but there is a gap in the spherical surface match, resulting in poor stability of the swing bearing, which may cause knocking noises during steering changes. In addition, the axial load borne by the self-aligning bearing is small, which limits the application of this structure. Utility Model Content

[0005] The utility model aims to solve at least one of the above-mentioned technical problems in the prior art to a certain extent. To this end, the utility model provides a swing bearing, which can improve the axial load capacity and stability of the swing bearing.

[0006] The utility model also provides a steering system with the swing bearing.

[0007] The utility model also provides a vehicle with the steering system.

[0008] According to the swing bearing of the embodiment of the utility model, it includes: an inner bearing, the inner bearing includes an inner ring and an outer ring arranged coaxially, the outer ring is sleeved on the radially outer side of the inner ring, and the inner ring is rotatable relative to the outer ring around a first axis; an inner swing shell, the inner swing shell is sleeved and fixed on the outer side of the outer ring; an outer fixed shell, the outer fixed shell is sleeved on the outer side of the inner swing shell, and the inner swing shell is swingable relative to the outer fixed shell around a second axis within a preset angle range, and the second axis is perpendicular to the first axis; wherein, in the extension direction of the first axis, a portion of the outer wall of the inner swing shell abuts and cooperates with a portion of the inner wall of the outer fixed shell.

[0009] According to the swing bearing of the embodiment of the utility model, the inner ring of the inner bearing is rotatable relative to the outer ring around the first axis, the inner swing shell is sleeved and fixed on the outer side of the outer ring, and the inner swing shell is swingable relative to the outer fixed shell around the second axis within a preset angle range to realize the swing function of the swing bearing, and a part of the outer wall of the inner swing shell is abutted and matched with a part of the inner wall of the outer fixed shell in the extension direction of the first axis, thereby improving the axial load capacity and stability of the swing bearing.

[0010] According to some embodiments of the utility model, the outer wall of the inner swing shell and the inner wall of the outer fixed shell form multiple groups of ball joint connection pairs, and the multiple groups of ball joint connection pairs are arranged at intervals along the second axis, and the center of the ball of each group of the ball joint connection pairs is located on the second axis.

[0011] According to some embodiments of the present invention, a plurality of groups of the ball joint connection pairs are symmetrically arranged relative to the first axis.

[0012] According to some embodiments of the present invention, in the extension direction of the first axis, the outer wall of the inner swing shell and the inner wall of the outer fixed shell are clearance-matched in a region outside the ball joint connection pair.

[0013] According to some embodiments of the utility model, the inner wall of the outer fixed shell includes: a first inner wall and a second inner wall, and the outer wall of the inner swing shell includes: a first outer wall and a second outer wall. In the extension direction of the first axis, the inner swing shell is arranged between the first inner wall and the second inner wall, and the first outer wall is arranged opposite to the first inner wall, and the second outer wall is arranged opposite to the second inner wall; the ball joint connection pair includes: a ball seat portion, the ball seat portion includes: a first groove and a second groove, the first groove is formed on the first inner wall, and the second groove is formed on the second inner wall; a spherical shell portion, the spherical shell portion includes: a first protrusion and a second protrusion, the first protrusion is formed on the first outer wall, and the second protrusion is formed on the second outer wall.

[0014] According to some embodiments of the present invention, a positioning protrusion is disposed on the outside of the outer fixing shell, and an extending direction of the positioning protrusion intersects and is perpendicular to the second axis.

[0015] According to some embodiments of the present invention, the inner bearing is configured as a ball bearing.

[0016] According to some embodiments of the utility model, the inner swing shell includes: a first sub-inner shell and a second sub-inner shell, and the first sub-inner shell and the second sub-inner shell are arranged on both axial sides of the outer ring; the outer fixed shell includes: a first sub-outer shell and a second sub-outer shell, and the first sub-outer shell and the second sub-outer shell are fixedly connected and arranged on both axial sides of the inner swing shell.

[0017] According to another aspect of the present invention, a steering system includes a worm shaft and the above-mentioned swing bearing, wherein one end of the worm shaft is connected to the inner ring.

[0018] According to the steering system of the embodiment of the utility model, one end of the worm shaft is connected to the inner ring of the swing bearing, the worm shaft can rotate and swing synchronously with the inner ring, the swing bearing can bear a larger axial load and avoid axial movement of the worm shaft, which is beneficial to improving the reliability of the steering system.

[0019] A vehicle according to another embodiment of the present invention includes the above-mentioned steering system.

[0020] According to the vehicle of the embodiment of the utility model, in its steering system, one end of the worm shaft is connected to the inner ring of the swing bearing, the worm shaft can rotate and swing synchronously with the inner ring, the swing bearing can bear a large axial load and avoid axial movement of the worm shaft, which is beneficial to improving the reliability of the steering system and the vehicle.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is an exploded view of a swing bearing according to an embodiment of the utility model;

[0023] Figure 2 is a three-dimensional diagram of a swing bearing according to an embodiment of the utility model;

[0024] Figure 3 is a top view of a swing bearing according to an embodiment of the utility model;

[0025] Figure 4 yes Figure 3 Section view at AA;

[0026] Figure 5 yes Figure 4 Schematic diagram of the middle and outer fixed shells;

[0027] Figure 6 yes Figure 4 Schematic diagram of the inner swing shell;

[0028] Figure 7 yes Figure 3 Sectional view at BB;

[0029] Figure 8 yes Figure 7 Schematic diagram of the inner swing shell;

[0030] Fig. 9 Schematic diagram of the swing of the inner swing shell according to the embodiment of the utility model Figure 1 ;

[0031] Fig.10 Schematic diagram of the swing of the inner swing shell according to the embodiment of the utility model Figure 2 ;

[0032] Fig.11 is an exploded view of an inner swing housing according to an embodiment of the utility model;

[0033] Fig.12 It is an exploded view of an outer fixing shell according to an embodiment of the utility model.

[0034] Reference numerals:

[0035] Inner bearing 1; inner ring 11; outer ring 12;

[0036] Inner swing housing 2; first sub-inner housing 21; first outer wall 211; second sub-inner housing 22; second outer wall 221;

[0037] The outer fixed shell 3; the first sub-shell body 31; the first inner wall 311; the second sub-shell body 32; the second inner wall 321; the positioning protrusion 33;

[0038] Ball joint connection pair 4; ball seat portion 41; first groove 411; second groove 412; ball shell portion 42; first protrusion 421; second protrusion 422;

[0039] Swing bearing 10. DETAILED DESCRIPTION

[0040] The embodiments of the present invention are described in detail below, and 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 intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0041] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] The swing bearing 10, the steering system and the vehicle according to the embodiment of the utility model are described in detail below with reference to the accompanying drawings.

[0045] Reference Figure 1-Figure 10 As shown, the swing bearing 10 according to the embodiment of the utility model includes: an inner bearing 1, an inner swing shell 2 and an outer fixed shell 3, the inner bearing 1 includes an inner ring 11 and an outer ring 12 arranged coaxially, the outer ring 12 is sleeved on the radial outer side of the inner ring 11, the inner ring 11 is rotatable relative to the outer ring 12 around a first axis L1, the inner swing shell 2 is sleeved and fixed on the outer side of the outer ring 12, the outer fixed shell 3 is sleeved on the outer side of the inner swing shell 2, the inner swing shell 2 is swingable relative to the outer fixed shell 3 around a second axis L2 within a preset angle range, the second axis L2 is perpendicular to the first axis L1, wherein, in the extension direction of the first axis L1, a portion of the outer wall of the inner swing shell 2 is abutted and matched with a portion of the inner wall of the outer fixed shell 3.

[0046] It can be understood that the outer fixed shell 3, the inner swing shell 2 and the outer ring 12 of the inner bearing 1 are nested from the outside to the inside, the inner ring 11 of the inner bearing 1 is suitable for being connected to the rotating shaft, the outer fixed shell 3 is suitable for being fixedly connected to the external frame, the inner ring 11 of the inner bearing 1 can support the rotating shaft and make the rotating shaft rotate around the first axis L1, and at the same time, the inner swing shell 2 fixedly connected to the outer ring 12 of the inner bearing 1 can swing around the second axis L2 in the outer fixed shell 3 within a preset angle range, that is, the inner bearing 1, the inner swing shell 2 and the rotating shaft can synchronously swing around the second axis L2 within a preset angle range to meet the use requirements of the swingable rotating shaft. For example, the rotating shaft is a worm shaft in the steering system of the vehicle, and the swing bearing 10 can realize the swing or adjustment of the worm shaft within a certain angle range, so that the steering system can adapt to the dynamic changes of the vehicle on different road surfaces.

[0047] Specifically, the extension direction of the first axis L1 can be Figure 2 and Figure 4 In the up and down direction, the extension direction of the second axis L2 can be Figure 2 and Figure 4 In the left and right directions, the inner bearing 1 includes an inner ring 11 and an outer ring 12 which are coaxially arranged. Balls and a retaining frame may be provided between the inner ring 11 and the outer ring 12. The inner ring 11 is rotatable relative to the outer ring 12 around a first axis L1. The first axis L1 may be a common axis of the inner ring 11 and the outer ring 12. The inner ring 11 may be connected to a rotating shaft so that the rotating shaft can rotate around the first axis L1.

[0048] The inner swing housing 2 is disposed between the outer fixed housing 3 and the outer ring 12 of the inner bearing 1. The outer wall of the inner swing housing 2 is movably connected to the inner wall of the outer fixed housing 3. Through the cooperation between the inner swing housing 2 and the outer fixed housing 3, the inner swing housing 2 can swing relative to the outer fixed housing 3 within a preset angle range around a second axis L2 perpendicular to the first axis L1. The swing direction is as follows: Figure 7 As shown by the middle arrow, the preset angle range can be [-α, α], 1°≤α≤10°, and since the inner swing shell 2 is mounted and fixed on the outside of the outer ring 12, the outer ring 12 can swing around the second axis L2 synchronously with the inner swing shell 2, thereby realizing that the inner ring 11 and the rotating shaft connected to the inner ring 11 can swing around the second axis L2 synchronously with the outer ring 12.

[0049] At the same time, in the extension direction of the first axis L1 (ie Figure 4 In the vertical direction), a part of the outer wall of the inner swing shell 2 and a part of the inner wall of the outer fixed shell 3 can maintain a state of abutment and matching, and the outer fixed shell 3 can support the inner swing shell 2 and the inner bearing 1 in the extending direction of the first axis L1, thereby improving the ability of the swing bearing 10 to withstand axial loads (i.e. Figure 4 The load in the up and down direction is reduced, and the inner swing shell 2 and the inner bearing 1 are prevented from shaking in the extension direction of the first axis L1, thereby improving the stability of the inner bearing 1.

[0050] According to the swing bearing 10 of the embodiment of the utility model, the inner ring 11 of the inner bearing 1 is rotatable around the first axis L1 relative to the outer ring 12, the inner swing shell 2 is sleeved and fixed on the outer side of the outer ring 12, and the inner swing shell 2 is swingable around the second axis L2 relative to the outer fixed shell 3 within a preset angle range to realize the swing function of the swing bearing 10, and a portion of the outer wall of the inner swing shell 2 is abutted and matched with a portion of the inner wall of the outer fixed shell 3 in the extension direction of the first axis L1, thereby improving the axial load capacity and stability of the swing bearing 10.

[0051] In some embodiments of the present invention, referring to Figure 4As shown, the outer wall of the inner swing shell 2 and the inner wall of the outer fixed shell 3 form multiple sets of ball joint connection pairs 4, and the multiple sets of ball joint connection pairs 4 are arranged at intervals along the second axis L2, and the ball center of each set of ball joint connection pairs 4 is located on the second axis L2.

[0052] Among them, the outer wall of the inner swing shell 2 and the inner wall of the outer fixed shell 3 are arranged opposite to each other. By setting the shape of the outer wall of the inner swing shell 2 and the inner wall of the outer fixed shell 3, the outer wall of the inner swing shell 2 and the inner wall of the outer fixed shell 3 can form a ball joint connection pair 4 at the matching position. The outer wall of the inner swing shell 2 can form a spherical shell structure of the ball joint connection pair 4, and the inner wall of the outer fixed shell 3 can form a ball seat structure of the ball joint connection pair 4. The spherical shell structure can rotate around the common spherical center of the two in the ball seat structure. At the same time, since multiple groups of ball joint connection pairs 4 are arranged at intervals along the second axis L2, and the spherical center of each group of ball joint connection pairs 4 is located on the second axis L2, thus, through the cooperation of multiple groups of ball joint connection pairs 4, the inner swing shell 2 can be swung relative to the outer fixed shell 3 around the second axis L2, and the swinging of the inner swing shell 2 and the outer fixed shell 3 in the direction outside the second axis L2 is limited. In addition, in the extension direction of the first axis L1, the outer wall of the inner swing shell 2 can maintain an abutment state with the inner wall of the outer fixed shell 3 at the ball seat structure formed at the spherical shell structure to increase the axial load capacity of the swing bearing 10.

[0053] In some embodiments of the present invention, referring to Figure 4 As shown, a plurality of ball joint connection pairs 4 are symmetrically arranged relative to the first axis L1.

[0054] Among them, in the extension direction of the second axis L2, one or more sets of ball joint connection pairs 4 can be symmetrically provided on both sides of the first axis L1 to evenly disperse the axial load of the swing bearing 10 and improve the stability of the inner swing shell 2 swinging in the outer fixed shell 3.

[0055] Reference Figure 4 In the illustrated embodiment, a group of symmetrical ball joint connection pairs 4 are respectively provided on both sides of the first axis L1 in the extending direction of the second axis L2.

[0056] In some embodiments not shown in the figures, in the extension direction of the second axis L2, two, three, or four groups of symmetrical ball-joint connection pairs 4 may be respectively provided on both sides of the first axis L1.

[0057] In some embodiments of the present invention, referring to Figure 7 As shown, in the extension direction of the first axis L1 , the outer wall of the inner swing housing 2 and the inner wall of the outer fixed housing 3 are clearance-fitted in the area outside the ball joint connection pair 4 .

[0058] It can be understood that, in the area outside the ball joint connection pair 4, between the outer wall of the inner swing housing 2 and the inner wall of the outer fixed housing 3, in the extension direction of the first axis L1 (i.e. Figure 7 In the up and down directions), the size D1 of the outer wall of the inner swing shell 2 is smaller than the size D2 of the inner wall of the outer fixed shell 3 to achieve a clearance fit between the two. The inner swing shell 2 can swing in the gap between the outer wall of the inner swing shell 2 and the inner wall of the outer fixed shell 3. In other words, the outer fixed shell 3 provides space for the inner swing shell 2 to move in an eccentric manner. At the same time, the inner wall of the outer fixed shell 3 can also limit the swing angle range of the inner swing shell 2. When the swing angle of the inner swing shell 2 reaches the upper and lower limits of the preset angle range, the outer wall of the inner swing shell 2 and the inner wall of the outer fixed shell 3 form abutment in the area outside the ball joint connection pair 4, so that the inner swing shell 2 swings around the second axis L2 relative to the outer fixed shell 3 within the preset angle range.

[0059] In some embodiments of the present invention, referring to Figure 4-Figure 6 As shown, the inner wall of the outer fixed shell 3 includes: a first inner wall 311 and a second inner wall 321, and the outer wall of the inner swing shell 2 includes: a first outer wall 211 and a second outer wall 221. In the extension direction of the first axis L1, the inner swing shell 2 is arranged between the first inner wall 311 and the second inner wall 321, and the first outer wall 211 is arranged opposite to the first inner wall 311, and the second outer wall 221 is arranged opposite to the second inner wall 321.

[0060] The ball joint connection pair 4 includes: a ball seat portion 41 and a ball shell portion 42. The ball seat portion 41 includes: a first groove 411 and a second groove 412. The first groove 411 is formed on the first inner wall 311, and the second groove 412 is formed on the second inner wall 321. The ball shell portion 42 includes: a first protrusion 421 and a second protrusion 422. The first protrusion 421 is formed on the first outer wall 211, and the second protrusion 422 is formed on the second outer wall 221.

[0061] Specifically, in the extension direction of the first axis L1 (ie Figure 4 In the up and down direction), the first groove 411 and the second groove 412 are arranged opposite to each other, at least a part of the first protrusion 421 is located in the first groove 411, and at least a part of the second protrusion 422 is located in the second groove 412, the first protrusion 421 and the second protrusion 422 are two spherical crown surfaces opposite to each other on the same spherical surface, the first groove 411 and the second groove 412 are also two spherical crown surfaces opposite to each other on the same spherical surface, the first groove 411 and the first protrusion 421 are conformally fitted, and the second groove 412 and the first protrusion 421 are conformally fitted, that is, the center of the spherical shell portion 42 and the center of the spherical seat portion 41 are at the same point, the spherical shell portion 42 composed of the first protrusion 421 and the second protrusion 422 can swing around the centers of the two spherical seats 41 composed of the first groove 411 and the second groove 412, so that the spherical seat portion 41 and the spherical shell portion 42 form a ball joint connection pair 4, the structure of the ball joint connection pair 4 is simple, easy to assemble, and has high reliability.

[0062] It can be understood that the first groove 411 and the second groove 412 of the ball seat portion 41 form a spherical inner space, and the first protrusion 421 and the second protrusion 422 of the ball shell portion 42 form an outer spherical structure. In addition, the spherical structure contacts and cooperates with the inner wall of the spherical inner space.

[0063] In some embodiments of the present invention, referring to Figure 2 and Figure 7 As shown, a positioning protrusion 33 is disposed on the outside of the outer fixing shell 3 , and an extending direction of the positioning protrusion 33 intersects and is perpendicular to the second axis L2 .

[0064] The extending direction of the positioning protrusion 33 may be the front-to-back direction, and the extending direction of the second axis L2 may be the left-to-right direction (ie Figure 7 When the extending direction of the positioning protrusion 33 intersects and is perpendicular to the second axis L2, the position of the second axis L2 can be identified by the positioning protrusion 33, so as to facilitate the assembly of the swing bearing 10. At the same time, a positioning structure matching the shape of the positioning protrusion 33 can be provided on the counterpart of the outer fixed shell 3. The positioning protrusion 33 can be positioned and matched with the counterpart (such as the reducer housing of the steering system) to fix the installation phase of the swing bearing 10, prevent the swing bearing 10 from loosening or shaking, and prevent the position of the second axis L2 from changing, thereby facilitating the stability of the swing bearing 10.

[0065] In some embodiments of the present invention, referring to Figure 7 As shown, the first axis L1 and the second axis L2 intersect and are perpendicular, and the intersection of the first axis L1 and the second axis L2 is the central symmetric point of the inner ring 11, so that when the swing bearing 10 is subjected to external loads, the forces of the various components of the swing bearing 10 are uniform, local stress concentration of the swing bearing 10 is avoided, and the risk of damage to the swing bearing 10 is reduced. In addition, when the inner swing shell 2 is at the middle position of the preset angle range, the extension direction of the positioning protrusion 33, the first axis L1 and the second axis L2 intersect and are perpendicular to each other, so as to facilitate the assembly and use of the swing bearing 10.

[0066] In some embodiments of the present invention, the inner bearing 1 is configured as a ball bearing.

[0067] Among them, the ball bearing can use a standard specification bearing model, and the ball bearing does not need to be customized and processed separately. The ball bearing has good versatility, low procurement cost and high reliability. Preferably, the inner bearing 1 is constructed as a four-point contact ball bearing, which can withstand a large axial load.

[0068] In some embodiments of the present invention, referring to Figure 1-Figure 7 as well as Fig.11 and Fig.12As shown, the inner swing housing 2 includes: a first sub-inner housing 21 and a second sub-inner housing 22, which are arranged on both axial sides of the outer ring 12. The outer fixed housing 3 includes: a first sub-outer housing 31 and a second sub-outer housing 32, which are fixedly connected and arranged on both axial sides of the inner swing housing 2.

[0069] Among them, the inner swing shell 2 includes a first sub-inner shell 21 and a second sub-inner shell 22 that are separately arranged, so as to facilitate the inner swing shell 2 to be assembled to the outside of the outer ring 12, and the outer fixed shell 3 includes a first sub-outer shell 31 and a second sub-outer shell 32 that are separately arranged, so as to facilitate the outer fixed shell 3 to be assembled to the outside of the inner swing shell 2, the first sub-inner shell 21 has a first outer wall 211, the second sub-inner shell has a second outer wall 221, the first sub-outer shell 31 has a first inner wall 311, the second sub-outer shell 32 has a second inner wall 321, the inner swing shell 2 and the outer fixed shell 3 have simple structures and are easy to assemble.

[0070] The first sub-outer shell 31 and the second sub-outer shell 32 can be fixedly connected by fasteners, welding, bonding, etc., the first sub-inner shell 21 can be clamped by the outer ring 12 and the first sub-outer shell 31, and the second sub-inner shell 22 can be clamped by the outer ring 12 and the second sub-outer shell 32. That is to say, the first sub-inner shell 21 and the second sub-inner shell 22 of the inner swing shell 2 can be connected without connecting parts to facilitate the assembly of the swing bearing 10.

[0071] According to another embodiment of the present invention, a steering system comprises a worm shaft and the swing bearing 10 of the above embodiment, wherein one end of the worm shaft is connected to the inner ring 11 .

[0072] Among them, one end of the worm shaft is connected to the inner ring 11 of the swing bearing 10. The end of the worm shaft connected to the inner ring 11 can rotate around the first axis L1 and can also swing around the second axis L2 within a preset angle range, so that the steering system can adapt to the dynamic changes of the vehicle on different road surfaces.

[0073] When the worm shaft rotates, it can drive the steering rod of the steering system to move, so as to drive the steering knuckle of the steering system to rotate through the steering rod, thereby realizing the steering of the vehicle. The worm shaft can be driven by the worm wheel, and the steering system can also be provided with a spring member, which can apply pressure directed to the swing bearing 10 to the end of the worm shaft away from the swing bearing 10, so that the worm shaft and the worm wheel maintain precise meshing, and prevent the worm shaft and the worm wheel from colliding alternately due to the meshing gap and producing abnormal noise.

[0074] In addition, in the extension direction of the first axis L1, a portion of the outer wall of the inner swing shell 2 and a portion of the inner wall of the outer fixed shell 3 can maintain an abutting fit state, and the outer fixed shell 3 can support the inner swing shell 2 and the inner bearing 1 in the extension direction of the first axis L1, thereby improving the ability of the swing bearing 10 to withstand axial loads and preventing the inner swing shell 2, the inner bearing 1 and the worm shaft from moving in the extension direction of the first axis L1.

[0075] According to the steering system of the embodiment of the utility model, one end of the worm shaft is connected to the inner ring 11 of the swing bearing 10, the worm shaft can rotate and swing synchronously with the inner ring 11, the swing bearing 10 can bear a large axial load and avoid axial movement of the worm shaft, which is beneficial to improving the reliability of the steering system.

[0076] A vehicle according to another embodiment of the present invention includes the steering system of the above embodiment.

[0077] In the vehicle according to the embodiment of the utility model, in its steering system, one end of the worm shaft is connected to the inner ring 11 of the swing bearing 10, the worm shaft can rotate and swing synchronously with the inner ring 11, the swing bearing 10 can bear a large axial load and avoid axial movement of the worm shaft, which is beneficial to improving the reliability of the steering system and the vehicle.

[0078] The swing bearing 10, the steering system and the vehicle according to the embodiment of the utility model have at least the following technical effects:

[0079] 1. The inner bearing 1 can use standard bearings, which are easy to purchase and have low cost. The inner swing housing 2 includes a first inner housing 21 and a second inner housing 22, and the outer fixed housing 3 includes a first outer housing 31 and a second outer housing 32. The first inner housing 21, the second inner housing 22, the first outer housing 31 and the second outer housing 32 are generally annular with flanged structures and can be formed by stamping. The inner swing housing 2 and the outer fixed housing 3 have simple structures, are easy to process, and have low processing costs. The swing bearing 10 has a simple process and low cost.

[0080] 2. The inner swing housing 2 and the outer fixed housing 3 fit tightly in the axial direction of the inner bearing 1, which can eliminate the axial clearance between the inner swing housing 2 and the outer fixed housing 3 to avoid movement of the worm shaft when the worm shaft is subjected to axial force.

[0081] 3. The inner swing shell 2 and the outer fixed shell 3 form a plurality of ball joint connection pairs 4, which achieve the effects of bearing swing, eliminating the gap between the rotating bearing and the external support, and fixing the bearing swing direction through a simple structure.

[0082] 4. The mating surface of the ball joint connection pair 4 is located on the axial end faces of the inner swing shell 2 and the outer fixed shell 3. Through the spherical structure matching, the larger end faces of the inner swing shell 2 and the outer fixed shell 3 are subjected to axial loads, and the axial bearing capacity is greater.

[0083] 5. In the traditional steering system, a self-aligning bearing is used to realize the rotation and swing of the worm. The deflection direction of the traditional self-aligning bearing is the spatial direction, and a guide limit mechanism needs to be set on the spring member, otherwise the worm shaft may deviate from the set meshing surface. The swing bearing 10 of the embodiment of the utility model can replace the self-aligning bearing in the traditional steering system. The swing direction of the inner bearing 1 can be fixed by the cooperation of multiple sets of ball joint connection pairs 4, so that the inner bearing 1 can only swing around the second axis L2 with the inner swing shell 2. In the steering system, because the worm shaft and the worm wheel must mesh according to the set meshing surface, the swing direction of the inner bearing 1 can be coplanar with the meshing surface of the worm shaft and the worm wheel, which can prevent the worm shaft from deviating from the set meshing surface. At the same time, since the swing direction of the inner bearing 1 is fixed, there is no need to set a limit mechanism on the spring member that applies elastic force to the worm shaft, and the structure of the spring member is simpler and the selection is more diverse.

[0084] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. 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 utility model. In this specification, the schematic representations 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 one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0085] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A swing bearing, characterized in that: include: An inner bearing (1), the inner bearing (1) comprising an inner ring (11) and an outer ring (12) which are coaxially arranged, the outer ring (12) being sleeved on the radially outer side of the inner ring (11), and the inner ring (11) being rotatable relative to the outer ring (12) around a first axis; An inner swing shell (2), the inner swing shell (2) being sleeved and fixed on the outer side of the outer ring (12); An outer fixed shell (3), the outer fixed shell (3) being sleeved on the outer side of the inner swing shell (2), the inner swing shell (2) being swingable around a second axis relative to the outer fixed shell (3) within a preset angle range, the second axis being perpendicular to the first axis; Wherein, in the extension direction of the first axis, a portion of the outer wall of the inner swing shell (2) is in abutment with a portion of the inner wall of the outer fixed shell (3).

2. The swivel bearing according to claim 1, characterized in that The outer wall of the inner swing shell (2) and the inner wall of the outer fixed shell (3) form a plurality of sets of ball joint connection pairs (4), the plurality of sets of ball joint connection pairs (4) are arranged at intervals along the second axis, and the ball center of each set of the ball joint connection pairs (4) is located on the second axis.

3. The sway bearing according to claim 2, characterized in that A plurality of groups of ball joint connection pairs (4) are symmetrically arranged relative to the first axis.

4. The sway bearing according to claim 2, characterized in that In the extension direction of the first axis, the outer wall of the inner swing shell (2) and the inner wall of the outer fixed shell (3) are clearance-matched in an area outside the ball joint connection pair (4).

5. The sway bearing according to claim 2, characterized in that The inner wall of the outer fixed shell (3) comprises: a first inner wall (311) and a second inner wall (321); the outer wall of the inner swing shell (2) comprises: a first outer wall (211) and a second outer wall (221); in the extension direction of the first axis, the inner swing shell (2) is arranged between the first inner wall (311) and the second inner wall (321), and the first outer wall (211) is arranged opposite to the first inner wall (311), and the second outer wall (221) is arranged opposite to the second inner wall (321); The ball joint connection pair (4) comprises: A ball seat portion (41), the ball seat portion (41) comprising: a first groove (411) and a second groove (412), the first groove (411) being formed on the first inner wall (311), and the second groove (412) being formed on the second inner wall (321); The spherical shell portion (42) comprises a first protrusion (421) and a second protrusion (422), wherein the first protrusion (421) is formed on the first outer wall (211), and the second protrusion (422) is formed on the second outer wall (221).

6. The sway bearing according to claim 1, characterized in that A positioning protrusion (33) is provided on the outside of the outer fixing shell (3), and the extending direction of the positioning protrusion (33) intersects and is perpendicular to the second axis.

7. The sway bearing according to claim 1, characterized in that The inner bearing (1) is designed as a ball bearing.

8. The slewing bearing according to any one of claims 1 to 7, characterized in that The inner swing housing (2) comprises: a first sub-inner housing (21) and a second sub-inner housing (22), wherein the first sub-inner housing (21) and the second sub-inner housing (22) are arranged on both axial sides of the outer ring (12); The outer fixed shell (3) comprises a first sub-shell shell (31) and a second sub-shell shell (32); the first sub-shell shell (31) and the second sub-shell shell (32) are fixedly connected and arranged on both axial sides of the inner swing shell (2).

9. A steering system, characterized in that: include: A worm shaft and a slewing bearing according to any one of claims 1 to 8, wherein one end of the worm shaft is connected to the inner ring (11).

10. A vehicle, characterized in that: Comprising a steering system according to claim 9.

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