Reverser, ball screw, steering gear and vehicle

Abstract

The utility model relates to a reverser, a ball screw, a steering gear and a vehicle, the reverser comprises a seat body and a cover body, the seat body is provided with a groove, and two channel openings communicating with the groove are formed in the side wall of the groove; the cover body and the seat body are separately arranged; the cover body can cover the groove opening of the groove and define a ball returning roller path for the balls to pass through, and the two channel openings are used for the balls to enter and exit from the ball returning roller path respectively. The seat body and the cover body of the reverser are arranged in a split manner, and the ball return raceway is jointly constructed by matching and covering of the groove in the seat body and the cover body instead of being formed by a cavity which is complexly arranged in an integrated structure. By means of the design, the requirement for directly forming a ball return raceway in an integrated structure is avoided, in the manufacturing process, only the external shapes of the cover body and the base body and forming of the grooves need to be concerned, compared with a complex internal cavity structure, processing of the external shapes is more visual and easy to achieve in the aspect of machining control, and therefore the manufacturing difficulty is reduced, and the manufacturing cost is reduced. And the large-batch production requirement can be met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steering system, and in particular to a reverser, a ball screw, a steering device and a vehicle. BACKGROUND

[0002] A ball screw is a precision mechanical transmission device used to convert rotary motion into linear motion. It mainly consists of a screw shaft, a nut and balls. The screw shaft has a helical groove, while the nut also has a matching helical groove inside, which together form a spiral raceway. The balls roll in these spiral raceways to reduce friction and transmit motion.

[0003] In order to realize the recycling of balls, the nut is designed with an axial through hole as a return channel, so that the balls can return from one end of the nut to the other end. At the same time, a reverser is installed between the screw rod and the nut, which is provided with a ball return raceway inside, connecting the spiral raceway and the return channel to form a closed circulation channel, ensuring the continuous movement of the balls. The ball return raceway usually has a complete circular cross-section or is composed of multiple circular arcs, and the contact surface is a continuously changing arched surface. This complex shape increases the difficulty of manufacturing the reverser, making it difficult to meet the requirements of mass production. CONTENT OF THE INVENTION

[0004] The present application provides a reverser, a ball screw, a steering device and a vehicle, which reduces the manufacturing difficulty and is conducive to meeting the demand of mass production, at least partially solving the above technical problems.

[0005] In order to achieve the above purpose, according to the first aspect of the present application, a reverser for a ball screw is provided, comprising:

[0006] a seat body provided with a groove, the side wall of the groove being provided with two channel openings in communication with the groove; and

[0007] a cover body provided separately from the seat body;

[0008] wherein the cover body can be covered on the groove opening of the groove, and define a ball return raceway for the balls to pass through, and the two channel openings are respectively used for the balls to enter and exit the ball return raceway.

[0009] Optionally, the cover body is rotationally connected with the seat body.

[0010] Optionally, one of the seat body and the cover body is provided with a shaft core, and the other is provided with a shaft hole, and the shaft core is rotationally arranged in the shaft hole.

[0011] Optionally, the shaft hole is arranged in an open manner in the radial direction of the shaft core, so that the shaft core can be loaded into the shaft hole from the opening.

[0012] Optionally, one of the seat body and the cover body is further provided with a sliding groove, and the other is further provided with a sliding part, the sliding part being capable of sliding into and along the sliding groove when the shaft core rotates relative to the shaft hole.

[0013] Optionally, one of the sliding part and the inner wall of the sliding groove is provided with a positioning groove, and the other is provided with a positioning part, the positioning part and the positioning groove being in plug-in cooperation to limit the relative sliding of the sliding part and the sliding groove.

[0014] Optionally, the seat body is provided with a limiting part, and the cover body is provided with a limiting matching part, the limiting matching part and the limiting part being in cooperation to limit the relative movement of the cover body and the seat body.

[0015] Optionally, the cover body comprises:

[0016] a cover plate, the cover being provided at the slot opening of the groove; and,

[0017] two side plates, the two side plates being protruded at one side of the cover plate facing the seat body, and the two side plates clamping the seat body.

[0018] According to a second aspect of the present application, a ball screw is provided, comprising:

[0019] a screw shaft;

[0020] a nut, the nut being sleeved on the screw shaft, the nut being internally provided with a return channel extending along the axial direction of the screw shaft, and the nut and the screw shaft defining a spiral raceway therebetween;

[0021] a reverser as in any one of the preceding items, the reverser being arranged between the nut and the screw shaft, the return channel, the return raceway and the spiral raceway being in communication to form a circulation channel; and,

[0022] a ball, the ball being arranged in the circulation channel.

[0023] Optionally, along the axial direction of the screw shaft, the nut has two end sides arranged oppositely, at least one of the end sides being provided with a mounting groove, the reverser being mounted in the mounting groove, and the bottom of the mounting groove being in communication with the return channel;

[0024] the ball screw further comprising a limiting member, the limiting member being partially arranged in the mounting groove and limiting the reverser.

[0025] Optionally, a through hole is formed in the peripheral wall of the mounting groove, the through hole extending to the outer peripheral side of the nut, and the limiting member being inserted in the through hole.

[0026] Optionally, the limiting member is partially arranged at the side of the reverser away from the bottom of the mounting groove.

[0027] According to a third aspect of the present application, a steering gear is provided, comprising the ball screw as claimed in any one of the preceding claims.

[0028] Optionally, the steering gear further comprises a pulley, which is at least partially sleeved on the outer circumferential side of the nut and presses the limiting member of the ball screw.

[0029] Optionally, the steering gear further comprises a bearing, which is sleeved on the outer circumferential side of the nut and presses the limiting member of the ball screw.

[0030] According to a fourth aspect of the present application, a vehicle is provided, comprising the ball screw as claimed in any one of the preceding claims or comprising the steering gear as claimed in any one of the preceding claims.

[0031] In the embodiments of the present application, the seat body and the cover body of the reverser are provided in a split type, the ball return race is jointly constructed by the recess on the seat body and the cover body, instead of being formed by a complex cavity structure inside an integrated structure. This design avoids the need to form the ball return race directly in the integrated structure, and only the external shape of the cover body and the seat body and the forming of the recess need to be concerned in the manufacturing process. Compared with the complex internal cavity structure, the processing of the external shape is more intuitive and easier to implement in the processing control, thereby reducing the manufacturing difficulty and facilitating the satisfaction of the mass production requirement.

[0032] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0034] In order to more completely understand the present application and its advantages, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0035] Figure 1 is a perspective view of the reverser provided in the exemplary embodiments of the present disclosure;

[0036] Figure 2 is Figure 1 is a perspective view of the reverser in

[0037] Figure 3 is Figure 2is a perspective view of the reverser in the cover body when the cover is placed on the slot opening;

[0038] Figure 4 is Figure 1 is a perspective view of the reverser from another angle;

[0039] Figure 5 is Figure 4 is a perspective view of the reverser when the shaft core is assembled to the shaft hole;

[0040] Figure 6 is Figure 4 is a perspective view of the seat body from another angle;

[0041] Figure 7 is a perspective view of the ball screw provided in the exemplary embodiment of the present disclosure;

[0042] Figure 8 is Figure 7 is an exploded view of the ball screw in the cover body;

[0043] Figure 9 is Figure 7 is a sectional view of the ball screw in the cover body;

[0044] Figure 10 is Figure 7 is a perspective view of the nut in the cover body;

[0045] Figure 11 is a sectional view of the reverser provided in the exemplary embodiment of the present disclosure.

[0046] Explanation of Reference Numerals:

[0047] 1000, reverser; 100, ball screw; 10, reverser; 101, ball rolling track; 1, seat body; 11, groove; 111, passage opening; 112, slot opening; 12, shaft hole; 121, opening; 13, sliding groove; 131, positioning groove; 14, limiting portion; 2, cover body; 21, shaft core; 22, sliding portion; 221, positioning portion; 23, limiting fitting portion; 24, cover plate; 25, side plate; 20, screw shaft; 30, nut; 301, return passage; 302, mounting groove; 303, groove bottom; 304, peripheral wall; 305, insertion hole; 40, ball; 50, circulation passage; 51, spiral rolling track; 60, limiting member; 200, pulley; 300, bearing; 400, housing. DETAILED DESCRIPTION

[0048] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0049] The present application provides a reverser, Figures 1 to 6 The structure diagram of the reverser provided by the embodiments of the present application is shown.

[0050] See Figures 1 to 3 The reverser 10 is used for the ball screw 100, and the reverser 10 comprises a seat body 1 and a cover body 2 arranged separately, the separate design allows the seat body 1 and the cover body 2 to be machined respectively, and the complexity of a single component is reduced.

[0051] The seat body 1 is provided with a groove 11, and the side wall of the groove 11 is provided with two passage openings 111 in communication with the groove 11, and the groove 11 provides a reserved space for the formation of the ball return track 101.

[0052] The cover body 2 can be arranged on the groove opening 112 of the groove 11 and define the ball return track 101 for the ball 40 to pass through, and the two passage openings 111 are respectively used for the ball 40 to enter and exit the ball return track 101. The ball return track 101 provides a clear movement path for the ball 40, ensuring that the ball 40 moves in a predetermined trajectory in the reverser 10. The two passage openings 111 serve as the ports for the ball 40 to enter and exit the ball return track 101, so that the ball return track 101 can be connected with the spiral track 51 and the return channel 301, thereby forming a closed circulation channel 50, and ensuring the continuity of the circulation of the ball 40.

[0053] In the technical solution of the present application, the seat body 1 and the cover body 2 of the reverser 10 are arranged separately, the ball return track 101 is jointly constructed by the cooperation of the groove 11 on the seat body 1 and the cover body 2, rather than being formed by a complex cavity structure inside an integrated structure. This design avoids the need to form the ball return track 101 directly in the integrated structure, and only the external shape of the cover body 2 and the seat body 1 and the forming of the groove 11 need to be concerned in the manufacturing process. Compared with the complex internal cavity structure, the processing of the external shape is more intuitive and easy to implement in machining control, thereby reducing the manufacturing difficulty and being conducive to meeting the mass production demand.

[0054] It can be understood that the cover body 2 and the seat body 1 can not be connected to each other, and the seat body 1 and the cover body 2 are respectively fixed between the nut 30 and the screw shaft 20, and the relative positions of the two are adjusted, so that the cover body 2 can be arranged on the groove opening 112 of the groove 11 and define the ball return track 101 for the ball 40 to pass through.

[0055] In order to make the cover 2 and the base 1 as a whole to be operated and managed before the ball screw 100 is assembled, the cover 2 and the base 1 are connected with each other. In some examples, one of the cover 24 and the base 1 has a slot, and the other is inserted into the slot to realize the insertion of the cover 2 and the base 1. In some examples, the base 1 and the cover 2 are respectively provided with internal and external threads to realize the threaded connection of the base 1 and the cover 2.

[0056] In some embodiments, the cover 2 is rotationally connected with the base 1. In these embodiments, the cover 2 is rotationally connected with the base 1, allowing the cover 2 and the base 1 to be operated and managed as a whole, and allowing the cover 2 to be adjusted at a certain angle relative to the base 1 during assembly, which helps the cover 2 to align with the notch 112 of the groove 11 during assembly, ensuring the accurate formation of the ball return raceway 101.

[0057] The application does not make specific limitations on the implementation of the rotational connection of the cover 2 and the base 1. In some examples, the cover 2 and the base 1 are connected by a hinge, so that the cover 2 and the base 1 can rotate relative to the axis of the hinge.

[0058] In some embodiments, see Figure 1 , Figure 4 and Figure 6 One of the base 1 and the cover 2 is provided with a shaft core 21, and the other is provided with a shaft hole 12, and the shaft core 21 is rotationally arranged in the shaft hole 12. In these embodiments, the shaft core 21 and the shaft hole 12 are formed on the base 1 and the cover 2, without the need for additional connecting parts. The shape of the shaft core 21 and the shaft hole 12 is relatively simple, and the processing technology is mature. Whether it is through mechanical processing methods such as turning or drilling, or through molding processes such as injection molding (for plastic products of the base 1 or the cover 2), the required shaft core 21 and shaft hole 12 can be relatively easily manufactured. During assembly, no complex assembly process or special tool is required. Only by inserting the shaft core 21 into the shaft hole 12 can the rotational connection of the base 1 and the cover 2 be realized, which helps to reduce manufacturing costs and improve production efficiency.

[0059] In some embodiments, see Figure 1 and Figure 6In some embodiments, the shaft hole 12 is provided with an opening 121 in the radial direction of the shaft core 21 to allow the shaft core 21 to be inserted into the shaft hole 12 from the opening 121. In these embodiments, the shaft hole 12 provided with the opening 121 allows the shaft core 21 to be directly inserted into the shaft hole 12 from the opening 121 without the need to insert the shaft core 21 from one end as in conventional closed shaft holes 12, facilitating installation and improving production efficiency. When maintaining and repairing, the shaft core 21 can also be replaced or repaired more quickly, reducing maintenance costs. It will be appreciated that the shaft core 21 being able to be inserted into the shaft hole 12 from the opening 121 means that the opening 121 is slightly smaller than the diameter of the shaft core 21, and the shaft core 21 and / or the opening 121 end of the shaft hole 12 has a certain elasticity, allowing the shaft core 21 to enter the shaft hole 12 by pressing the opening 121 end, and after the shaft core 21 is installed in place, the shaft core 21 and / or the opening 121 end of the shaft hole 12 returns to its original shape, and the shaft core 21 is not easily removed from the opening 121, allowing the shaft core 21 to remain stable in the shaft hole 12. In some examples, the shaft core 21 is provided in the cover 2, the cover 2 is a plastic part, the shaft hole 12 is provided in the seat 1, and the seat 1 is a metal part. Metal has high strength and hardness, which can ensure the shape accuracy and stability of the groove 11 and the shaft hole 12. Due to the elasticity of plastic, the shaft core 21 can deform to a certain extent when being inserted into the shaft hole 12 through the opening 121, allowing the shaft core 21 to smoothly enter the shaft hole 12. It will be appreciated that the seat 1 is a metal part, which has good strength and can improve the overall strength of the reverser 10, and the cover 2 is a plastic part, which can reduce the abnormal noise when the balls 40 move.

[0060] In some embodiments, Figure 1 , Figure 2 , Figure 4 and Figure 5In some embodiments, one of the base body 1 and the cover body 2 is further provided with a sliding groove 13, and the other is further provided with a sliding part 22, when the shaft core 21 rotates relative to the shaft hole 12, the sliding part 22 can slide into the sliding groove 13 and slide along the sliding groove 13. In these embodiments, when the shaft core 21 rotates relative to the shaft hole 12, the sliding part 22 can slide into the sliding groove 13 and slide along the sliding groove 13, which means that the sliding groove 13 extends along the circumference of the shaft core 21, and the sliding part 22 slides along the sliding groove 13 in a circular arc trajectory. During assembly, the cooperation between the sliding groove 13 and the sliding part 22 increases the contact area between the base body 1 and the cover body 2. A larger contact area can disperse the force between the base body 1 and the cover body 2. When there is an external force (such as pressure during assembly, slight impact force, etc.), a larger contact area means that the force per unit area is reduced, thereby reducing the risk of local stress being too large to cause deformation or damage to the components. Due to the cooperation between the sliding groove 13 and the sliding part 22, during the rotation of the shaft core 21 relative to the shaft hole 12, the sliding part 22 slides along the sliding groove 13 in a circular arc trajectory. This movement mode plays a role in restraining and stabilizing the relative position of the shaft core 21 and the shaft hole 12. Assuming that there is no cooperation between the sliding groove 13 and the sliding part 22, the shaft core 21 may

[0061] In some embodiments, Figure 1 、 Figure 2 、 Figure 4 and Figure 5, one of the sliding portion 22 and the inner wall of the sliding groove 13 is provided with a positioning groove 131, and the other is provided with a positioning portion 221, the positioning portion 221 and the positioning groove 131 are inserted and matched to limit the relative sliding of the sliding portion 22 and the sliding groove 13. In these embodiments, the positioning portion 221 and the positioning groove 131 are inserted and matched to limit the relative sliding of the sliding portion 22 and the sliding groove 13, thereby limiting the relative rotation of the cover body 2 and the seat body 1, so that the cover body 2 is relatively fixed with the seat body 1. When the reverser 10 is installed on the ball screw 100 or the like, it may be subjected to external vibration or operating force. The relative fixation of the cover body 2 and the seat body 1 can prevent the cover body 2 from being accidentally loosened or falling off, thereby ensuring the normal installation and subsequent stable use of the reverser 10. It can be understood that the sliding portion 22 can slide along the sliding groove 13, and the positioning portion 221 and the positioning groove 131 can be inserted and matched to limit the relative sliding therebetween. This means that when the positioning portion 221 is provided on the sliding portion 22 and the positioning groove 131 is provided on the sliding groove 13, the positioning portion 221 and / or the inner wall of the sliding groove 13 has a certain elasticity. The positioning portion 221 can extrude the inner wall of the sliding groove 13, so that the sliding portion 22 can normally slide in the sliding groove 13. When the positioning portion 221 moves relative to the positioning groove 131, the positioning portion 221 is extruded into the positioning groove 131. The positioning portion 221 and / or the inner wall of the sliding groove 13 returns to the original shape. The positioning portion 221 will not easily come out of the positioning groove 131, so that the positioning portion 221 remains stable in the positioning groove 131. Similarly, when the positioning portion 221 is provided on the sliding groove 13 and the positioning groove 131 is provided on the sliding portion 22, the positioning portion 221 and / or the sliding portion 22 has a certain elasticity. The positioning portion 221 and the sliding portion 22 extrude each other, so that the sliding portion 22 can normally slide in the sliding groove 13. When the positioning groove 131 moves relative to the positioning portion 221, the positioning portion 221 is extruded into the positioning groove 131. The positioning portion 221 and / or the sliding portion 22 returns to the original shape. The positioning portion 221 will not easily come out of the positioning groove 131, so that the positioning portion 221 remains stable in the positioning groove 131. In some examples, the sliding portion 22 is provided on the cover body 2, the positioning portion 221 is provided on the sliding portion 22, the cover body 2 is a plastic part, the sliding groove 13 is provided on the seat body 1, the positioning groove 131 is provided on the inner wall of the sliding groove 13, and the seat body 1 is a metal part. The metal has high strength and hardness, which can ensure the shape accuracy and stability of the sliding groove 13 and the positioning groove 131. Due to the elasticity of the plastic, the positioning portion 221 can deform to a certain extent when the sliding portion 22 slides into the sliding groove 13, so that the sliding portion 22 can smoothly slide into the sliding groove 13 and slide along the sliding groove 13. When the positioning portion 221 moves to be opposite to the positioning groove 131, the positioning portion 221 is extruded into the positioning groove 131.

[0062] In some embodiments, see Figure 2 and Figure 4The seat body 1 is provided with a limiting portion 14, and the cover body 2 is provided with a limiting matching portion 23. The limiting matching portion 23 matches with the limiting portion 14 to limit the relative movement of the cover body 2 and the seat body 1, so that the cover body 2 is relatively fixed with the seat body 1. When the reverser 10 is installed on the ball screw 100, the cover body 2 and the seat body 1 are relatively fixed, which can prevent the cover body 2 from being loosened or falling off accidentally, thereby ensuring the normal installation and subsequent stable use of the reverser 10. The specific arrangement of the limiting portion 14 and the limiting matching portion 23 is not limited in the present application. For example, the limiting portion 14 is the positioning groove 131 in the previous embodiment, and the limiting matching portion 23 is the positioning portion 221 in the previous embodiment. For another example, the limiting portion 14 is a pin hole, and the limiting matching portion 23 is a pin shaft. For another example, the limiting portion 14 and the limiting matching portion 23 are two magnetic attraction portions that attract each other.

[0063] In some embodiments, see Figure 2 and Figure 3 The cover body 2 includes a cover plate 24 and two side plates 25. The cover plate 24 covers the slot opening 112 of the groove 11, and the two side plates 25 protrude from one side of the cover plate 24 towards the seat body 1 and clamp the seat body 1. In these embodiments, the clamping action of the two side plates 25 greatly enhances the connection stability between the cover body 2 and the seat body 1. When a large external force (such as impact force generated by sudden start or stop of the equipment) is applied, the cover body 2 with the side plates 25 can be better maintained on the seat body 1, avoiding relative displacement between the cover body 2 and the seat body 1, maintaining the shape stability of the ball return raceway 101, ensuring the realization of the function of the reverser 10, and improving the product reliability. It can be understood that the protrusion of the two side plates 25 from one side of the cover plate 24 towards the seat body 1 to clamp the seat body 1 means that the size of the seat body 1 between the two side plates 25 is slightly larger than the distance between the two side plates 25, at least one of the side plates 25 and / or the seat body 1 has a certain elasticity, and the seat body 1 can be clamped between the two side plates 25, so that the two side plates 25 clamp the seat body 1. In some examples, the cover body 2 is a plastic part, and the seat body 1 is a metal part. The metal has high strength and hardness, and can ensure the shape accuracy and stability of the groove 11. Due to the elasticity of the plastic, when the seat body 1 is squeezed into the two side plates 25, the two side plates 25 can be deformed to a certain extent, so that the seat body 1 smoothly enters between the two side plates 25 and is clamped and fixed.

[0064] According to a second aspect of the present application, see Figure 7 , Figure 8 and Figure 9The application provides a ball screw 100, which comprises a screw shaft 20, a nut 30, balls 40 and a reverser 10; the nut 30 is sleeved on the screw shaft 20, the nut 30 is internally provided with a return channel 301 extending along the axial direction of the screw shaft 20, and the nut 30 and the screw shaft 20 define a spiral raceway 51; the reverser 10 can be the reverser 10 in any one of the above-mentioned embodiments, and will not be described herein again, the reverser 10 is arranged between the nut 30 and the screw shaft 20, the return channel 301, the ball return raceway 101 and the spiral raceway 51 are communicated to form a circulation channel 50; the balls 40 are arranged in the circulation channel 50. Since the ball screw 100 adopts all the technical solutions in the above-mentioned embodiments, at least has the beneficial effects brought by the technical solutions in the above-mentioned embodiments, which will not be described herein again.

[0065] In some embodiments, see Figure 7 、 Figure 8 、 Figure 9 and Figure 10 , along the axial direction of the screw shaft 20, the nut 30 has two oppositely arranged end sides, at least one end side is provided with a mounting groove 302, the reverser 10 is mounted in the mounting groove 302, the groove bottom 303 of the mounting groove 302 is communicated with the return channel 301, and the ball screw 100 further comprises a limiting piece 60, the limiting piece 60 is partially located in the mounting groove 302 and limits the reverser 10. In these embodiments, the mounting groove 302 provides a specific mounting space for the reverser 10, the shape and size of which are determined according to the design requirements of the reverser 10, the reverser 10 is limited in a certain way, the limiting piece 60 can further limit the movement of the reverser 10 in the mounting groove 302, and when the ball screw 100 is subjected to external vibration or load change, the limiting piece 60 can ensure that the reverser 10 does not loosen or displace, thereby ensuring the normal operation of the ball screw 100.

[0066] The type and assembly mode of the limiting piece 60 are not limited in the application, for example, the limiting piece 60 is a retaining ring, and an assembly groove is recessed in the peripheral wall 304 of the mounting groove 302, and the retaining ring is assembled in the assembly groove.

[0067] In some embodiments, the peripheral wall 304 of the mounting groove 302 is provided with a plug hole 305 extending to the outer peripheral side of the nut 30, and the limiting piece 60 is inserted into the plug hole 305. In these embodiments, since the plug hole 305 extends to the outer peripheral side of the nut 30, the limiting piece 60 can be directly inserted into the plug hole 305 from the outside of the nut 30, thereby avoiding the need to disassemble other components or enter a narrow space for installation, greatly simplifying the assembly process and reducing the assembly steps and complexity.

[0068] This application does not limit how the limiting member 60 limits the inverter 10. In some examples, the inverter 10 is provided with a positioning hole, and the limiting member 60 extends from the insertion hole 305 into the mounting groove 302. One end of the limiting member 60 is inserted into the positioning hole to limit the inverter 10.

[0069] In some embodiments, the limiting member 60 is located on the side of the reverser 10 opposite to the bottom 303 of the mounting groove 302. In these embodiments, the limiting member 60 and the bottom 303 of the mounting groove 302 together restrict the displacement of the reverser 10 in the axial direction of the lead screw shaft 20, eliminating the need for additional structures on the reverser 10 that cooperate with the limiting member 60, reducing manufacturing and assembly difficulty, and improving production efficiency.

[0070] According to the third aspect of this application, see Figure 11 A steering gear 1000 is provided, which includes a ball screw 100, which can be any of the ball screws 100 described in the above embodiments. Since the steering gear 1000 adopts all the technical solutions of all the above embodiments, it has at least the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0071] This application does not limit how the limiting member 60 is fixed. The limiting member 60 itself can be fixed to the nut 30 by fasteners (screws or bolts). Alternatively, expansion adhesive can be applied to the inner wall of the socket 305 to fix the limiting member 60 to the nut 30.

[0072] In some embodiments, see Figure 11 The steering gear 1000 also includes a pulley 200, which is at least partially fitted onto the outer periphery of the nut 30 and presses against the limiting member 60 of the ball screw 100. In these embodiments, the pulley 200 is directly fitted onto the outer periphery of the nut 30 and presses against the limiting member 60 of the ball screw 100. This simplifies the structure of the steering gear 1000, eliminates the need for a dedicated pressing device, reduces the number of parts, lowers costs, improves production efficiency, and reduces potential failure points due to an increase in the number of parts.

[0073] In some embodiments, see Figure 11The steering gear 1000 further comprises a bearing 300, which is sleeved on the outer circumferential side of the nut 30 and presses the limiting piece 60 of the ball screw 100. In these embodiments, the bearing 300 is directly sleeved on the outer circumferential side of the nut 30 and presses the limiting piece 60 of the ball screw 100, which simplifies the structure of the steering gear 1000, does not need to additionally set a special pressing device, reduces the number of parts, simplifies the structure, can reduce the cost, improve the production efficiency, and reduce the fault points that can be caused by the increase of the parts.

[0074] In some examples, see Figure 11 The steering gear 1000 further comprises a housing 400, the bearing 300 is arranged between the nut 30 and the housing 400, the housing 400 provides structural support, and the bearing 300 arranged between the nut 30 and the housing 400 plays a role in reducing friction, supporting load and stabilizing motion.

[0075] According to a fourth aspect of the present application, a vehicle is provided, comprising the ball screw 100 or the steering gear 1000, the ball screw 100 can be the ball screw 100 in any one of the above embodiments, and the steering gear 1000 can be the steering gear 1000 in any one of the above embodiments. Since the vehicle adopts all the technical solutions of the above embodiments, it at least has the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0076] The vehicle can be a fuel automobile, a plug-in hybrid electric vehicle or a new energy vehicle, and the present disclosure does not make specific limitation thereon.

[0077] In the description of the present application, the terms "first", "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0078] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0079] The embodiments, implementation manners and related technical features of the present application can be combined, replaced or modified without conflict.

[0080] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present application, without departing from the technical solution of the present application, still belongs to the scope of the technical solution of the present application.

Claims

1. A reverser for a ball screw, characterized by, The reverser comprises: a seat body provided with a recess, a side wall of the recess being provided with two passage openings in communication with the recess; and a cover body provided separately from the seat body; wherein the cover body is capable of being provided on a slot opening of the recess and defining a ball returning track for the balls to pass through, and the two passage openings are respectively used for the balls to enter or exit the ball returning track.

2. The reverser of Claim 1 wherein, The cover body is rotationally connected with the seat body.

3. The reverser of Claim 2 wherein, One of the seat body and the cover body is provided with a shaft core, and the other is provided with a shaft hole, the shaft core being rotationally provided in the shaft hole.

4. The reverser of Claim 3 wherein, The shaft hole is provided in an open manner in a radial direction of the shaft core, so that the shaft core can be loaded into the shaft hole from the opening.

5. The reverser of Claim 3 wherein, One of the seat body and the cover body is further provided with a sliding groove, and the other is further provided with a sliding part, the sliding part being capable of sliding into the sliding groove and sliding along the sliding groove when the shaft core rotates relative to the shaft hole.

6. The reverser of Claim 5 wherein, One of the sliding part and an inner wall of the sliding groove is provided with a positioning groove, and the other is provided with a positioning part, the positioning part being inserted and matched with the positioning groove to limit the relative sliding of the sliding part and the sliding groove.

7. The reverser of claim 1 wherein, The seat body is provided with a limiting part, the cover body is provided with a limiting matching part, the limiting matching part being matched with the limiting part to limit the relative movement of the cover body and the seat body.

8. The reverser of claim 1 wherein, The cover body comprises: a cover plate provided on a slot opening of the recess; and two side plates protruding from a side of the cover plate facing the seat body, the two side plates clamping the seat body.

9. A ball screw, characterized by, It comprises: a lead screw shaft; a nut sleeve provided on the lead screw shaft, the nut being provided with a return channel extending in an axial direction of the lead screw shaft, the nut and the lead screw shaft defining a spiral track therebetween; the reverser according to any one of claims 1 to 8 is provided between the nut and the lead screw shaft, the return channel, the ball returning track and the spiral track being in communication to form a circulation channel; and balls provided in the circulation channel.

10. The ball screw of claim 9, wherein, In the axial direction of the lead screw shaft, the nut has two oppositely arranged end sides, at least one of the end sides being provided with a mounting groove, the reverser being mounted in the mounting groove, and a groove bottom of the mounting groove being in communication with the return channel. The ball screw further comprises a limiting piece, the limiting piece being partially located in the mounting groove and limiting the reverser.

11. The ball screw of claim 10, wherein, A insertion hole is provided in a peripheral wall of the mounting groove, the insertion hole extending to an outer peripheral side of the nut, and the limiting piece being inserted in the insertion hole.

12. The ball screw of claim 11, wherein, The limiting piece is partially located on a side of the reverser away from the groove bottom of the mounting groove.

13. A diverter characterized by, It comprises the ball screw according to any one of claims 9 to 12.

14. The diverter of claim 13, wherein, The reverser further comprises a belt wheel, the belt wheel being at least partially sleeved on an outer peripheral side of the nut and pressing and holding the limiting piece of the ball screw.

15. The diverter of claim 13, wherein, The reverser further comprises a bearing, the bearing being sleeved on an outer peripheral side of the nut and pressing and holding the limiting piece of the ball screw.

16. A vehicle characterized by comprising: It comprises the ball screw according to any one of claims 9 to 12 or the reverser according to any one of claims 13 to 15.

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