Power-assisted steering mechanism and vehicle

Abstract

The embodiment of the utility model relates to the technical field of power-assisted steering and discloses a power-assisted steering mechanism and a vehicle, the power-assisted steering mechanism comprises a shell, a lead screw shaft and a lead screw nut seat, the lead screw shaft and the lead screw nut seat are located in the shell, and the lead screw nut seat is arranged on the lead screw shaft in a sleeving mode and forms a lead screw nut matching pair with the lead screw shaft. A bearing piece is further included, the inner ring of the bearing piece is arranged on the lead screw nut base in a sleeving mode, and the outer ring of the bearing piece abuts against the inner wall of the shell. An outer ring of the bearing piece is provided with an elastic piece which is used for providing elastic buffering in the radial direction of the lead screw nut base. According to the power-assisted steering mechanism provided by the embodiment of the invention, rigid impact of the lead screw nut seat and the lead screw shaft in time can be reduced, impact abnormal sound generated between the lead screw nut seat and the lead screw shaft can be effectively reduced, and the user experience is effectively improved.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of power-assisted steering, in particular to a power-assisted steering mechanism and a vehicle. BACKGROUND

[0002] An electric power steering system (EPS) is a power steering system directly relying on a motor to provide auxiliary torque, and compared with a traditional hydraulic power-assisted steering system, the electric power steering system has many advantages.

[0003] The electric power steering system comprises a screw shaft and a screw nut seat, and the screw shaft is rotationally matched with the screw nut seat to form a screw nut pair. However, in the electric power steering system, abnormal sound is easily generated between the screw shaft and the screw nut seat when a vehicle passes through a bumpy road (for example, a cobblestone road and a European brick road), which affects user experience. CONTENT OF THE UTILITY MODEL

[0004] In view of this, the embodiment of the present application provides a power-assisted steering mechanism and a vehicle, which can effectively reduce or avoid abnormal sound generated between the screw shaft and the screw nut seat, thereby effectively improving user experience.

[0005] In order to achieve the above purpose, the technical scheme of the embodiment of the present application is as follows:

[0006] The first aspect of the embodiment of the present application provides a power-assisted steering mechanism, comprising:

[0007] a housing;

[0008] a screw shaft, the screw shaft being located in the housing;

[0009] a screw nut seat, the screw nut seat being sleeved on the screw shaft and forming a screw nut matching pair with the screw shaft;

[0010] further comprising a bearing piece, an inner ring of the bearing piece being sleeved on the screw nut seat, and an outer ring of the bearing piece abutting against an inner wall of the housing;

[0011] the outer ring of the bearing piece has an elastic piece, and the elastic piece is used for providing elastic buffering in a radial direction of the screw nut seat.

[0012] The embodiment of the present application sets the elastic member in the outer ring of the bearing piece, which can provide elastic buffering in the radial direction of the screw nut seat. For example, when the vehicle drives on a bumpy road (e.g., a cobblestone road and a European brick road), the screw shaft will generate a radial impact force on the screw nut seat. At this time, the elastic member in the outer ring of the bearing piece can provide radial buffering for the screw nut seat to absorb the impact force of the screw shaft on the screw nut seat. Thus, the rigid impact between the screw nut seat and the screw shaft is reduced, which can effectively reduce the impact noise between the screw nut seat and the screw shaft. The user experience is effectively improved.

[0013] In a possible implementation manner, the application further comprises:

[0014] The first wave spring is annular in structure, is located on one side of the bearing piece and abuts against the outer ring of the bearing piece, and the other side of the first wave spring abuts against the shell.

[0015] The first wave spring is configured to provide elastic buffering in the axial direction of the screw nut seat.

[0016] In a possible implementation manner, the application further comprises:

[0017] The second wave spring is annular in structure, and the first wave spring and the second wave spring are respectively located on opposite sides of the bearing piece.

[0018] The locking member is fastened to the inner wall of the shell.

[0019] One side of the second wave spring abuts against the outer ring of the bearing piece, and the other side of the second wave spring abuts against the locking member.

[0020] The second wave spring is configured to provide elastic buffering in the axial direction of the screw nut seat.

[0021] In a possible implementation manner, the outer ring of the bearing piece comprises:

[0022] The first outer ring is arranged outside the inner ring.

[0023] The second outer ring is arranged outside the first outer ring.

[0024] The elastic member is located between the first outer ring and the second outer ring.

[0025] In a possible implementation manner, the elastic member is a rubber ring.

[0026] In a possible implementation manner, the application further comprises:

[0027] A steering pull rod, one end of which is connected with the screw shaft, and the other end is used for being connected with a steering knuckle of the vehicle.

[0028] In a possible implementation, the steering pull rod is connected with the screw shaft in a universal manner.

[0029] In a possible implementation, a first threaded groove is formed in the outer periphery of the screw shaft.

[0030] A second threaded groove is formed in the inner wall of the screw nut seat.

[0031] Further comprising a ball, part of which is located in the first threaded groove, and another part of which is located in the second threaded groove.

[0032] In a possible implementation, a driving motor is further included, which is in transmission connection with the screw shaft, and is used for assisting in driving the screw shaft to rotate.

[0033] The second aspect of the embodiments of the present application provides a vehicle comprising the power-assisted steering mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 A structural schematic diagram of a power-assisted steering mechanism provided by the embodiments of the present application;

[0035] Figure 2 A sectional view of a power-assisted steering mechanism provided by the embodiments of the present application;

[0036] Figure 3 A Figure 2 An enlarged view of the region A;

[0037] Figure 4 A structural schematic diagram of a bearing provided by the embodiments of the present application;

[0038] Figure 5 A structural schematic diagram of a first wave spring provided by the embodiments of the present application.

[0039] REFERENCE SIGNS:

[0040] 100 - power-assisted steering mechanism;

[0041] 110 - housing;

[0042] 120 - screw shaft;

[0043] 130 - screw nut seat;

[0044] 140 - bearing; 141 - elastic member; 142 - inner ring; 143 - outer ring; 1431 - first outer ring; 1432 - second outer ring;

[0045] 150 - first wave spring; 160 - second wave spring;

[0046] 170 - steering tie rod;

[0047] 180 - drive motor;

[0048] 190 - input shaft;

[0049] 101 - locking member. DETAILED DESCRIPTION

[0050] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will further describe the specific technical solutions of the present application with reference to the drawings in the embodiments of the present application. The following embodiments are used to explain the present application, but not to limit the scope of the present application.

[0051] In the embodiments 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 with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0052] In addition, in the embodiments of the present application, the orientation terms such as "up", "down", "left" and "right" are defined with respect to the orientation of the components shown in the drawings, and it should be understood that these directional terms are relative concepts, which are used for relative description and clarification, and can be changed accordingly according to the change of the orientation of the components placed in the drawings.

[0053] In the embodiments of the present application, unless otherwise specified and limited, the term "connection" should be understood broadly, for example, "connection" can be fixed connection, or detachable connection, or integral; can be directly connected, or indirectly connected through intermediate medium.

[0054] In the embodiments of the present application, the term "include", "contain" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or device. Without more limitation, the element defined by the sentence "including a" does not exclude the existence of other same elements in the process, method, article or device including the element.

[0055] In the embodiments of the present application, the word "exemplary" or "for example" is used to mean serving as an example, instance, or illustration. Any embodiment or design described in the embodiments of the present application as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the word "exemplary" or "for example" is used in the sense of "an example of" to present concepts in a concrete manner.

[0056] The embodiments of the present application provide an electric power assisted steering mechanism and a vehicle comprising the same, and it should be noted that the vehicle in the present application can refer to a large car, a small car, a special-purpose car, and the like. For example, according to the vehicle type, the car in the present application can be a sedan type, a passenger car type, a truck type, an off-road type, a multi-purpose vehicle (MPV) type, or other types. For example, the vehicle can be any one of an electric vehicle, a pure electric vehicle, a hybrid vehicle, a range-extended electric vehicle, a plug-in hybrid vehicle, and a new energy vehicle.

[0057] For a vehicle, a wheel, a power source, and a transmission system arranged between the wheel and the power source are generally provided. The transmission system can transmit power provided by the power source to the wheel to drive the vehicle to run.

[0058] It should be noted that the type of the power source of the vehicle is not limited in the embodiments of the present application. For example, for a fuel vehicle, the power source can refer to a gasoline engine, a diesel engine, or other fuel engines. For an electric vehicle, the power source can refer to an electric motor. For a hybrid vehicle, the power source can refer to an engine or an electric motor. For a vehicle powered in other ways, the power source can refer to a device that generates power.

[0059] The vehicle can further comprise a chassis and a vehicle body arranged on the chassis, wherein the vehicle body can have a passenger compartment, and the passenger compartment can be provided with a driver seat, a passenger seat, and the like, and a driver can sit on the driver seat to operate the vehicle. For example, the vehicle body can be further provided with a steering wheel, a clutch, a brake, and other structural members to enable the vehicle to realize complete functions, which are not limited in the present application.

[0060] As described in the background, the electric power assisted steering system comprises a screw shaft and a screw nut seat, and the screw shaft is rotationally connected with the screw nut seat to form a screw nut pair. However, in the above electric power assisted steering system, when the vehicle passes through a bumpy road (for example, a cobblestone road and a European brick road), the screw shaft and the screw nut seat are prone to generate abnormal noise, which affects the user experience.

[0061] To address the aforementioned problems, this application provides an electric power steering mechanism that utilizes an elastic element within the outer ring of the bearing component. This elastic element provides radial cushioning to the lead screw nut seat. For example, when a vehicle travels on bumpy surfaces (e.g., cobblestone or brick roads), the lead screw shaft experiences radial impact on the lead screw nut seat. The elastic element in the outer ring of the bearing component provides radial cushioning to absorb this impact force. This reduces the rigid impact between the lead screw nut seat and the lead screw shaft, effectively minimizing impact noise between them and improving the user experience.

[0062] The electric power steering mechanism provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0063] Figure 1 This is a schematic diagram of the structure of a power steering mechanism provided in an embodiment of this application. Figure 2 This is a cross-sectional view of a power steering mechanism provided in an embodiment of this application. Figure 3 for Figure 2 A magnified view of region A in the middle. Figure 4 This is a schematic diagram of the structure of a bearing component provided in an embodiment of this application.

[0064] This application embodiment provides a power steering mechanism 100, which can be an electric power steering mechanism. See [link to previous document]. Figure 1 and Figure 2 As shown, the power steering mechanism 100 may include a housing 110 and a lead screw shaft 120 and a lead screw nut seat 130 located within the housing 110. The lead screw nut seat 130 may be sleeved on the lead screw shaft 120 and form a lead screw nut mating pair with the lead screw shaft 120.

[0065] The power steering mechanism 100 may also include an input shaft 190, one end of which may be connected to the steering wheel and the other end of which may be connected to the lead screw shaft 120. When the user turns the steering wheel, the input shaft 190 can be rotated, thereby driving the lead screw shaft 120 to rotate.

[0066] The lead screw nut seat 130 can provide support and a mounting platform for the lead screw shaft 120, so that the lead screw shaft 120 can rotate and move relative to the lead screw nut seat 130.

[0067] Combination Figure 3 and Figure 4 As shown, the electric power steering mechanism 100 may also include a bearing 140, the inner ring 142 of which may be fitted onto the lead screw nut seat 130, and the outer ring 143 of which may abut against the inner wall of the housing 110.

[0068] The outer ring 143 of the bearing piece 140 has an elastic piece 141 for providing elastic buffering in the radial direction of the screw nut seat 130. For example, when the vehicle travels on a bumpy road (e.g., a cobblestone road and a European brick road), the screw shaft 120 will generate an impact force in the radial direction on the screw nut seat 130. At this time, the elastic piece 141 in the outer ring 143 of the bearing piece 140 can provide radial buffering for the screw nut seat 130 to absorb the impact force of the screw shaft 120 on the screw nut seat 130. Thus, the rigid impact between the screw nut seat 130 and the screw shaft 120 is reduced, which can effectively reduce the impact noise between the screw nut seat 130 and the screw shaft 120. The user experience is effectively improved.

[0069] Figure 5 A structural schematic diagram of one of the embodiments of the present application is provided.

[0070] Continuing to refer to Figure 3 As shown, the power steering mechanism 100 can further include a first wave spring 150, which is combined with Figure 5 As shown, the first wave spring 150 can have a ring structure, and can surround the screw nut seat 130. The first wave spring 150 can be located on one side of the bearing piece 140 and abut against the outer ring 143 of the bearing piece 140, and the other side of the first wave spring 150 can abut against the housing 110.

[0071] The first wave spring 150 can be used to provide elastic buffering in the axial direction of the screw nut seat 130. The wave spring, also referred to as a wave spring, is an elastic element with a plurality of peaks and valleys on a thin metal ring, that is, the surface of the wave spring is wavy, and the wave spring can provide elastic buffering in the axial direction thereof.

[0072] When the vehicle travels on a bumpy road (e.g., a cobblestone road and a European brick road), the screw shaft 120 will also generate an impact force in the axial direction on the screw nut seat 130. At this time, the first wave spring 150 abutting against the outer ring 143 of the bearing piece 140 can provide axial buffering for the screw nut seat 130 to absorb the impact force of the screw shaft 120 on the screw nut seat 130. Thus, the rigid impact between the screw nut seat 130 and the screw shaft 120 is reduced, which can effectively reduce the impact noise between the screw nut seat 130 and the screw shaft 120. The user experience is effectively improved.

[0073] Continuing to refer to Figure 3 As shown, the power steering mechanism 100 can further include a second wave spring 160 and a locking piece 101, and the second wave spring 160 can also have a ring structure, and can surround the screw nut seat 130. The second wave spring 160 and the first wave spring 150 can be located on opposite sides of the bearing piece 140, respectively.

[0074] The locking member 101 can be fastened to the inner wall of the housing 110. For example, the outer periphery of the locking member 101 can have external threads, and the inner wall of the housing 110 can have internal threads, and the locking member 101 can be connected to the housing 110 by cooperation between the external threads and the internal threads.

[0075] One side of the second wave spring 160 can abut against the outer ring 143 of the bearing member 140, and the other side can abut against the locking member 101, and the second wave spring 160 is used to provide elastic buffering in the axial direction of the screw nut seat 130.

[0076] By arranging the first wave spring 150 and the second wave spring 160 on both sides of the bearing member 140, the buffering effect of the screw nut seat 130 in the axial direction can be effectively improved. The rigid impact of the screw shaft 120 and the screw nut seat 130 in the axial direction can be effectively reduced, thereby effectively reducing the impact noise of the screw shaft 120 and the screw nut seat 130, and improving the user experience.

[0077] Referring to Figure 4 As shown, the outer ring 143 of the bearing member 140 can include a first outer ring 1431 and a second outer ring 1432, and the first outer ring 1431 can be arranged around the inner ring 142. The balls of the bearing member 140 can be located between the first outer ring 1431 and the inner ring 142, so that the inner ring 142 and the first outer ring 1431 can rotate relative to each other.

[0078] The second outer ring 1432 can be arranged around the first outer ring 1431, and the elastic member 141 can be located between the first outer ring 1431 and the second outer ring 1432. That is, the elastic member 141 can provide buffering between the first outer ring 1431 and the second outer ring 1432 to provide radial elastic buffering for the screw nut seat 130, thereby reducing or avoiding abnormal noise between the screw nut seat 130 and the screw shaft 120.

[0079] In the embodiments of the present application, the elastic member 141 can be a rubber ring. That is, the elastic member 141 can be made of rubber, which has high elasticity, good wear resistance and corrosion resistance, and can effectively improve the elasticity of the elastic member 141, thereby providing better elastic buffering effect for the screw nut seat 130.

[0080] Moreover, the wear resistance and corrosion resistance of the elastic member 141 can be effectively improved, and the service life of the elastic member 141 can be prolonged.

[0081] Continuing to refer to Figure 2 As shown, the power steering mechanism 100 can further include a steering tie rod 170, one end of the steering tie rod 170 can be connected to the screw shaft 120, and the other end can be used to be connected to the steering knuckle of the vehicle.

[0082] In the process of rotating, the lead screw shaft 120 can drive the steering pull rod 170 to swing, so that the steering pull rod 170 can pull the steering knuckle to swing, so as to realize the steering of the vehicle.

[0083] Continuing to refer to Figure 2 As shown, the steering pull rod 170 and the lead screw shaft 120 can be connected in a universal manner. In this way, the flexibility of the connection between the lead screw shaft 120 and the steering pull rod 170 can be effectively improved, so that the steering pull rod 170 can rotate in multiple directions relative to the lead screw shaft 120, thereby effectively improving the flexibility of the steering of the vehicle.

[0084] Referring to Figure 3 As shown, the outer periphery of the lead screw shaft 120 can be provided with a first threaded groove, and the inner wall of the lead screw nut seat 130 can be provided with a second threaded groove. The power steering mechanism 100 can further include a ball, part of which can be located in the first threaded groove, and another part of which can be located in the second threaded groove.

[0085] The lead screw shaft 120 and the lead screw nut seat 130 can be connected through the cooperation of the ball in the first threaded groove and the second threaded groove, so that the lead screw shaft 120 and the lead screw nut seat 130 can form a lead screw nut pair. In this way, the lead screw shaft 120 and the lead screw nut seat 130 can be in rolling friction, which can effectively reduce the friction between the lead screw shaft 120 and the lead screw nut seat 130. The smoothness of the movement between the lead screw shaft 120 and the lead screw nut seat 130 is improved.

[0086] Continuing to refer to Figure 3 As shown, the power steering mechanism 100 can further include a drive motor 180, which can be in transmission connection with the lead screw shaft 120. The drive motor 180 can be used to assist in driving the lead screw shaft 120 to rotate.

[0087] For example, when the lead screw shaft 120 is rotating, the drive motor 180 can rotate to assist the lead screw shaft 120 in rotating. In this way, the user only needs to use a small force to rotate the steering wheel, and the lead screw shaft 120 can drive the steering pull rod 170 to rotate to realize steering. Without using a large force, the user's effort can be effectively reduced, which has a good labor-saving effect, thereby effectively improving the efficiency of the user's steering and improving the user experience.

[0088] The above-mentioned sequence numbers of the embodiments of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments. The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A power assisted steering mechanism characterised in that, Comprise: A shell (110); A lead screw shaft (120) located in the shell (110); A lead screw nut seat (130) sleeved on the lead screw shaft (120) and forming a lead screw nut mating pair with the lead screw shaft (120); Further comprising a bearing piece (140), the inner ring (142) of the bearing piece (140) is sleeved on the lead screw nut seat (130), and the outer ring (143) of the bearing piece (140) abuts against the inner wall of the shell (110); The outer ring (143) of the bearing piece (140) has a elastic piece (141) for providing elastic buffer in the radial direction of the lead screw nut seat (130).

2. A power assisted steering mechanism according to claim 1, characterised in that, Further comprising: A first wave spring (150) in ring structure, located on one side of the bearing piece (140) and abutting against the outer ring (143) of the bearing piece (140), and the other side abutting against the shell (110); The first wave spring (150) is used for providing elastic buffer in the axial direction of the lead screw nut seat (130).

3. A power assisted steering mechanism according to claim 2, wherein Further comprising: A second wave spring (160) in ring structure, located on the opposite sides of the bearing piece (140) respectively with the first wave spring (150); A locking piece (101) fastened and connected with the inner wall of the shell (110); One side of the second wave spring (160) abuts against the outer ring (143) of the bearing piece (140), and the other side abuts against the locking piece (101); The second wave spring (160) is used for providing elastic buffer in the axial direction of the lead screw nut seat (130).

4. A power assisted steering mechanism according to any one of claims 1 to 3, wherein The outer ring (143) of the bearing piece (140) comprises: A first outer ring (1431) surrounding the inner ring (142); A second outer ring (1432) surrounding the first outer ring (1431); The elastic piece (141) is located between the first outer ring (1431) and the second outer ring (1432).

5. A power assisted steering mechanism according to claim 4, wherein The elastic piece (141) is a rubber ring.

6. A power assisted steering mechanism according to any one of claims 1 to 3, wherein Further comprising: A steering drag link (170) connected with the lead screw shaft (120) at one end and used for connecting with the steering knuckle of a vehicle at the other end.

7. A power assisted steering mechanism according to claim 6, wherein The steering drag link (170) is connected with the lead screw shaft (120) in a universal manner.

8. A power assisted steering mechanism according to any one of claims 1 to 3, wherein A first thread groove is formed on the outer periphery of the lead screw shaft (120); A second thread groove is formed on the inner wall of the lead screw nut seat (130); Further comprising balls, part of which is located in the first thread groove, and the other part of which is located in the second thread groove.

9. A power assisted steering mechanism according to any one of claims 1 to 3, wherein The power steering mechanism further comprises a driving motor (180) which is in driving connection with the lead screw shaft (120), and the driving motor (180) is used for assisting driving the lead screw shaft (120) to rotate.

10. A vehicle characterized by comprising: The power steering mechanism further comprises a driving motor (180) which is in driving connection with the lead screw shaft (120), and the driving motor (180) is used for assisting driving the lead screw shaft (120) to rotate.

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