Electric power steering gear assembly and vehicle

Abstract

The utility model discloses an electric power steering gear assembly and a vehicle, and belongs to the technical field of vehicles. Comprising a driving device, a transmission device and an electric power assisting device, the transmission device is assembled at the output end of the driving device, and the electric power assisting device is assembled at the position, close to the transmission device, of the driving device; the transmission device comprises a driving wheel, a driven mechanism and a screw, the driving wheel is connected with the driving device, the driven mechanism is arranged on the periphery of the screw in a sleeving mode and connected with the screw through a thread pair, and the driving device drives the driving wheel to rotate and drives the driven mechanism to rotate so as to drive the screw to horizontally move in the first direction. By arranging the transmission device, the steering gear assembly replaces a gear rack and recirculating ball type steering gear, so that the gear cutting condition does not exist in the steering gear assembly, and the structure is more compact; therefore, the steering gear can bear larger load and has the beneficial effect of improving the bearable load of the steering gear.

Description

Technical Field

[0001] The present application belongs to the field of vehicle technology, and specifically relates to an electric power steering assembly and a vehicle. Background Art

[0002] With the rapid development of vehicles, the steering system of vehicles is also undergoing major changes in the process of vehicle development. With the electrification and intelligence of the entire vehicle, there is a great demand for steering systems with large load-bearing capacity.

[0003] In the prior art, in the steering gear assembly of the vehicle, by driving the rack to move linearly along the rotation direction of the steering wheel, the movement of the rack can make the steering tie rods located at both ends of the rack drive the vehicle's steering knuckle to rotate left and right, and the rotation of the steering knuckle can make the wheel deflect, thereby realizing the steering function of the vehicle. At present, passenger cars generally use rack and pinion steering gears, and commercial vehicles mostly use recirculating ball steering gears.

[0004] However, during operation, the rack and pinion steering gear described above may experience tooth cutting, which is not conducive to carrying large loads, while the recirculating ball steering gear has a loose and complex structure and an unreasonable layout, which is not conducive to the miniaturization design of the steering gear assembly. Utility Model Content

[0005] The purpose of the embodiments of the present application is to provide an electric power steering assembly and a vehicle that can solve at least one of the above-mentioned problems.

[0006] In order to solve the above technical problems, this application is implemented as follows:

[0007] In a first aspect, an embodiment of the present application provides an electric power steering assembly, comprising a drive device, a transmission device and an electric power assist device, wherein the transmission device is mounted at the output end of the drive device, and the electric power assist device is mounted at a position of the drive device close to the transmission device; the transmission device comprises a driven mechanism and a screw, wherein the driven mechanism is connected to the drive device, the driven mechanism is sleeved on the outer periphery of the screw and connected to the screw through a threaded pair, and the drive device drives the driven mechanism to rotate to drive the screw to translate along a first direction; wherein the first direction is the axial direction of the screw.

[0008] In an embodiment of the present application, the drive device may include a steering wheel shaft, a first universal joint, an intermediate shaft and a second universal joint. The drive device is configured to provide driving force to the transmission device to drive the transmission device to move. The electric power assist device is configured to assist the user to turn the driving wheel more easily, thereby improving the load-bearing capacity of the steering gear assembly.

[0009] Furthermore, the transmission device includes a driving wheel, a driven mechanism and a screw rod, wherein the driven mechanism is connected to the driving wheel, and when the driving wheel rotates, the driven mechanism rotates along with the rotation of the driving wheel. The driven mechanism is sleeved on the outer periphery of the screw rod and connected to the screw rod through a threaded pair, and when the driving device drives the driving wheel to rotate, that is, when the driving wheel drives the driven mechanism to rotate, the driven mechanism drives the screw rod to translate in a first direction, thereby realizing the swinging steering of the vehicle tire.

[0010] Furthermore, by providing a transmission device, the electric power steering assembly replaces the gear rack and recirculating ball type steering gear, so that the electric power steering gear will not have tooth cutting and has a more compact structure; therefore, the electric power steering gear in the present application can withstand a larger load, which has the beneficial effect of increasing the load that the steering gear can withstand.

[0011] Optionally, in an embodiment of the present application, the driven mechanism includes a driven wheel assembly and a transmission assembly, the transmission assembly and the driven wheel assembly are sequentially sleeved on the outer circumference of the screw, the driven wheel assembly is connected to the output end of the driving device, the driven wheel assembly and the transmission assembly are rotationally connected, and the transmission assembly and the screw are connected via a threaded pair; the rotation of the driven wheel assembly can drive the transmission assembly to rotate so that the screw moves translationally along the first direction.

[0012] Optionally, in an embodiment of the present application, the transmission assembly includes at least two rollers, and the rollers are clamped between the screw and the driven wheel assembly along the radial direction of the screw, and at least two of the rollers are arranged relatively to each other along the radial direction of the screw; the rollers and the driven wheel assembly are rotationally connected, and the rollers and the screw are connected via a threaded pair, and the rotation of the driven wheel assembly can drive the rollers to rotate so that the screw moves translationally along the first direction.

[0013] Optionally, in an embodiment of the present application, the roller includes a cylinder, a threaded member, a first limit gear and a second limit gear, the threaded member, the first limit gear and the second limit gear are sleeved on the cylinder and fixedly connected to the cylinder, the threaded member is clamped between the first limit gear and the second limit gear, and both ends of the threaded member along the first direction have a preset gap with the first limit gear and the second limit gear; wherein the first limit gear and the second limit gear are both rotatably connected to the driven wheel assembly, and the threaded member and the screw are connected via a threaded pair.

[0014] Optionally, in an embodiment of the present application, the driven wheel assembly includes a driven wheel, a first baffle and a second baffle, the driven wheel, the first baffle and the second baffle are all sleeved on the outer periphery of the screw, the first baffle and the second baffle are relatively arranged along the first direction, and the first baffle and the second baffle are fixedly connected to the driven wheel; the driven wheel, the first baffle, the second baffle and the screw are surrounded by a accommodating space, and at least two of the rollers are arranged in the accommodating space; the first baffle is provided with a first limiting hole, and the second baffle is provided with a second limiting hole, and the two ends of the column pass through the first limiting hole and the second limiting hole respectively; wherein, the number of the first limiting holes and the second limiting holes corresponds one-to-one to the number of the rollers.

[0015] Optionally, in an embodiment of the present application, the first limiting gear is clamped to the first baffle plate, and the second limiting gear is clamped to the second baffle plate; wherein the diameter of the first limiting gear is larger than the diameter of the first limiting hole, and the diameter of the second limiting gear is larger than the diameter of the second limiting hole.

[0016] Optionally, in an embodiment of the present application, the roller also includes two sliding bearings, which are respectively mounted on both ends of the column; one sliding bearing is arranged on the side of the first limiting gear away from the threaded member and is located in the first limiting hole, and the other sliding bearing is arranged on the side of the second limiting gear away from the threaded member and is located in the second limiting hole.

[0017] Optionally, the driven wheel includes a first gear portion and a second gear portion, the first gear portion and the second gear portion are fixedly connected, and the gear teeth of the first gear portion and the gear teeth of the second gear portion extend away from each other; the first gear portion and the output end of the driving device are rotatably connected, and the second gear portion is rotatably connected to the first limit gear and the second limit gear; the output end of the driving device drives the first gear portion to rotate to drive the second gear portion to rotate so that the roller rotates.

[0018] Optionally, in an embodiment of the present application, the electric power-assisting device includes a power-assisting motor, a coupling, a worm gear and a worm, the power-assisting motor and the worm gear are connected via the coupling, the worm gear and the worm gear are movably connected, and the worm gear is connected to the driving device.

[0019] Optionally, an embodiment of the present application also provides a vehicle, comprising the electric power steering assembly as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of an electric power steering assembly in an embodiment of the present application;

[0021] Figure 2 is a schematic diagram of the structure of the transmission device in the embodiment of the present application;

[0022] Figure 3 In the embodiment of this application Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0023] Figure 4 is a schematic diagram of the cross-sectional structure of the driven wheel assembly in an embodiment of the present application;

[0024] Figure 5 is a schematic diagram of the structure of the roller in the embodiment of the present application;

[0025] Figure 6 It is a schematic diagram of the structure of the electric power assist device in an embodiment of the present application.

[0026] Description of reference numerals:

[0027] 10. driving device; 20. transmission device; 21. driven mechanism; 211. driven wheel assembly; 2111. driven wheel; 21111. first gear portion; 21112. second gear portion; 2112. first baffle plate; 21121. first limiting hole; 2113. second baffle plate; 21131. second limiting hole; 2114. accommodating space; 212. transmission assembly; 2121. roller; 212 11. Cylinder; 21212. Threaded part; 21213. First limit gear; 21214. Second limit gear; 2122. Sliding bearing; 22. Screw; 30. Electric power assist device; 31. Power assist motor; 32. Coupling; 33. Worm gear; 34. Worm; 40. Steering wheel shaft; 41. First universal joint; 42. Intermediate shaft; 43. Second universal joint; 44. Driving wheel; X, first direction. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0030] The electric power steering assembly and the vehicle provided in the embodiments of the present application are described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0031] See also Figures 1 to 6 The embodiment of the present application provides an electric power steering assembly, including a driving device 10, a transmission device 20 and an electric power assist device 30. The transmission device 20 is mounted at the output end of the driving device 10, and the electric power assist device 30 is mounted at a position of the driving device 10 close to the transmission device 20; the transmission device 20 includes a driving wheel 44, a driven mechanism 21 and a screw 22. The driving wheel 44 is connected to the driving device 10, and the driving wheel 44 is connected to the driven mechanism 21. The driven mechanism 21 is sleeved on the outer periphery of the screw 22 and is connected to the screw 22 through a threaded pair. The driving device 10 drives the driving wheel 44 to rotate, and the driving wheel 44 drives the screw 22 to translate along a first direction X through the driven mechanism 21; wherein the first direction X is the axial direction of the screw 22.

[0032] In an embodiment of the present application, the drive device 10 may include a steering wheel shaft 40, a first universal joint 41, an intermediate shaft 42 and a second universal joint 43. The drive device 10 is configured to provide driving force for the transmission device 20 to drive the transmission device 20 to move. The electric power assist device 30 is configured to assist the user to more easily rotate the driving wheel 44, thereby improving the load-bearing capacity of the steering gear assembly.

[0033] Furthermore, the transmission device 20 includes a driving wheel 44, a driven mechanism 21 and a screw rod 22. The driven mechanism 21 is connected to the driving wheel 44. When the driving wheel 44 rotates, the driven mechanism 21 rotates along with the rotation of the driving wheel 44. The driven mechanism 21 is sleeved on the outer periphery of the screw rod 22 and connected to the screw rod 22 through a threaded pair. When the driving device 10 drives the driving wheel 44 to rotate, that is, when the driving wheel 44 drives the driven mechanism 21 to rotate, the driven mechanism 21 drives the screw rod 22 to translate along the first direction X, thereby realizing the swinging steering of the vehicle tire.

[0034] In the embodiment of the present application, the transmission device 20 is provided so that the electric power steering assembly replaces the gear rack and recirculating ball type steering gear, so that the electric power steering assembly will not have tooth cutting and the structure is more compact; therefore, the electric power steering assembly in the present application can withstand a larger load, which has the beneficial effect of increasing the load that the steering assembly can withstand.

[0035] Alternatively, if Figure 2 As shown, in the embodiment of the present application, the driven mechanism 21 includes a driven wheel assembly 211 and a transmission assembly 212, the transmission assembly 212 and the driven wheel assembly 211 are sequentially sleeved on the outer periphery of the screw 22, the driven wheel assembly 211 is connected to the output end of the driving device 10, the driven wheel assembly 211 and the transmission assembly 212 are rotationally connected, and the transmission assembly 212 and the screw 22 are connected via a threaded pair; the rotation of the driven wheel assembly 211 can drive the transmission assembly 212 to rotate so that the screw 22 moves horizontally along the first direction X.

[0036] In the embodiment of the present application, the driven wheel assembly 211 is connected to the output end of the driving device 10. It can be understood that the driven wheel assembly 211 is connected to the driving wheel 44. The driven wheel assembly 211 is configured to be movably connected to the driving wheel 44. When the driving wheel 44 rotates, the driven wheel is driven to rotate, thereby driving the transmission assembly 212 to rotate. Further, the transmission assembly 212 is sleeved on the outer periphery of the screw rod 22 and the transmission assembly 212 and the screw rod 22 are connected by a threaded pair. When the transmission assembly 212 rotates, the screw rod 22 can be driven to translate along the first direction X, thereby realizing the swing steering of the vehicle tire.

[0037] In the embodiment of the present application, the setting of driving the screw 22 to move in the first direction X is achieved by the rotation of the driving wheel 44, the driven wheel assembly 211 and the transmission assembly 212. Since the driving force transmitted from the driving wheel 44 to the screw 22 is transmitted between the parts and assemblies through rotation, compared with the rack transmission, the driven wheel assembly 211 and the transmission assembly 212 can withstand a larger load, thereby having the beneficial effect of increasing the load that the steering gear assembly can withstand.

[0038] Alternatively, if Figure 3 and Figure 4 As shown, in the embodiment of the present application, the transmission assembly 212 includes at least two rollers 2121, and the rollers 2121 are clamped between the screw 22 and the driven wheel assembly 211 along the radial direction of the screw 22, and at least two rollers 2121 are relatively arranged along the radial direction of the screw 22; the rollers 2121 and the driven wheel assembly 211 are rotationally connected, and the rollers 2121 and the screw 22 are connected by a threaded pair, and the rotation of the driven wheel assembly 211 can drive the rollers 2121 to rotate so that the screw 22 moves translationally along the first direction X.

[0039] In the embodiment of the present application, the roller 2121 is provided to transfer force from the driven wheel assembly 211 to the screw 22 through the roller 2121, thereby driving the screw 22 to translate along the first direction X. Specifically, the roller 2121 is sandwiched between the screw 22 and the driven wheel assembly 211. In actual application, when the driving wheel 44 rotates to transfer force to the driven wheel assembly 211, the driven wheel assembly 211 rotates accordingly, and the roller 2121 rotatably connected to the driven wheel assembly 211 also rotates accordingly. Furthermore, since the roller 2121 and the screw 22 are connected by a threaded pair, when the roller 2121 rotates, the screw 22 can translate along the first direction X. It can be understood that in order to improve the stability of force transmission during the rotation process, at least two rollers 2121 are relatively arranged along the radial direction of the screw 22. During the actual force transmission process, the at least two rollers 2121 relatively arranged along the radial direction of the screw 22 rotate under the drive of the driven wheel assembly 211 to smoothly transmit the force to the screw 22, so that the screw 22 can smoothly translate along the first direction X. In addition, the arrangement structure of the rollers 2121 is compact, which has the beneficial effect of improving the miniaturization of the steering gear.

[0040] It should be noted that the transmission assembly 212 may also include four rollers 2121 , or the transmission assembly 212 may also include five rollers 2121 , and the four rollers 2121 or the five rollers 2121 may be evenly distributed.

[0041] Alternatively, if Figure 5 As shown, the roller 2121 includes a column 21211, a threaded member 21212, a first limit gear 21213 and a second limit gear 21214. The threaded member 21212, the first limit gear 21213 and the second limit gear 21214 are sleeved on the column 21211 and are fixedly connected to the column 21211. The threaded member 21212 is clamped between the first limit gear 21213 and the second limit gear 21214. Both ends of the threaded member 21212 along the first direction X have a preset interval with the first limit gear 21213 and the second limit gear 21214; wherein the first limit gear 21213 and the second limit gear 21214 are both rotatably connected to the driven wheel assembly 211, and the threaded member 21212 and the screw rod 22 are connected by a threaded pair.

[0042] In the embodiment of the present application, the threaded member 21212, the first position-limiting gear 21213 and the second position-limiting gear 21214 are all fixedly connected to the column 21211. The column 21211 is provided to realize indirect connection between the above-mentioned components. The threaded member 21212 is provided to be connected to the screw rod 22 through a threaded pair. The first position-limiting gear 21213 and the second position-limiting gear 21214 are provided to be rotationally connected to the driven wheel assembly 211. In practical applications, the driven wheel assembly 211 rotates to drive the first position-limiting gear 21213 and the second position-limiting gear 21214 to rotate, thereby driving the column 21211 to rotate, and the threaded member 21212 fixedly connected to the column 21211 also rotates with the rotation of the column 21211, thereby realizing the translation of the screw rod 22 connected to the threaded member 21212 through the threaded pair.

[0043] Furthermore, the first limit gear 21213 and the second limit gear 21214 are arranged relatively to each other along the first direction X, and are clamped at both ends of the screw member 21212. The arrangement of the first limit gear 21213 and the second limit gear 21214 can make the rotation movement smooth, which has the beneficial effect of improving the stability of force transmission.

[0044] Optionally, in the embodiment of the present application, the driven wheel assembly 211 includes a driven wheel 2111, a first baffle 2112, and a second baffle 2113. The driven wheel 2111, the first baffle 2112, and the second baffle 2113 are all sleeved on the outer periphery of the screw 22. The first baffle 2112 and the second baffle 2113 are arranged opposite to each other along the first direction X. The first baffle 2112 and the second baffle 2113 are both fixedly connected to the driven wheel 2111. The driven wheel 2111, the first baffle 2112, and the second baffle 2113 are It is enclosed with the screw rod 22 to form a accommodating space 2114, and at least two rollers 2121 are arranged in the accommodating space 2114; the first baffle plate 2112 is provided with a first limiting hole 21121, and the second baffle plate 2113 is provided with a second limiting hole 21131, and both ends of the column 21211 pass through the first limiting hole 21121 and the second limiting hole 21131 respectively, wherein the number of the first limiting holes 21121 and the second limiting holes 21131 correspond one-to-one to the number of the rollers 2121.

[0045] In the embodiment of the present application, the driven wheel 2111 is configured to transfer force from the driving wheel 44 to the roller 2121. In actual applications, in order to avoid the transfer of force caused by the roller 2121 separating from the driven wheel 2111 during movement, the first baffle 2112 and the second baffle 2113 are configured to limit the roller 2121. Specifically, the first baffle 2112 and the second baffle 2113 are arranged opposite to each other along the first direction X, and the first baffle 2112 and the second baffle 2113 are both fixedly connected to the driven wheel 2111. It can be understood that the screw 22, the driven shaft, the first baffle 2112 and the second baffle 2113 are enclosed to form a accommodating space 2114. The accommodating space 2114 is set to provide a placement space for the roller 2121. The roller 2121 can rotate in the accommodating space 2114 to achieve the transmission of the force provided by the driven wheel 2111 to the screw 22, and the first baffle 2112 and the second baffle 2113 are set to prevent the roller 2121 from escaping from the accommodating space 2114 along the first direction X during the rotational movement. Furthermore, the first baffle plate 2112 is provided with a first limiting hole 21121, and the second baffle plate 2113 is provided with a second limiting hole 21131. The two ends of the column 21211 pass through the first limiting hole 21121 and the second limiting hole 21131 respectively. In order not to affect the rotation of the roller 2121 to transmit force to the screw 22, the two ends of the column 21211 can rotate in the first limiting hole 21121 and the second limiting hole 21131.

[0046] Furthermore, when the transmission assembly 212 includes a plurality of rollers 2121, a plurality of first limiting holes 21121 are provided on the first baffle plate 2112, and a plurality of second limiting holes 21131 are provided on the second baffle plate 2113. It can be understood that the number of the first limiting holes 21121 or the second limiting holes 21131 is respectively set to correspond to the number of the rollers 2121.

[0047] Optionally, in an embodiment of the present application, the first limiting gear 21213 is clamped on the first baffle 2112, and the second limiting gear 21214 is clamped on the second baffle 2113; wherein, the diameter of the first limiting gear 21213 is greater than the diameter of the first limiting hole 21121, and the diameter of the second limiting gear 21214 is greater than the diameter of the second limiting hole 21131.

[0048] In the embodiment of the present application, the first limiting gear 21213 is also used to cooperate with the first limiting hole 21121 to prevent the roller 2121 from escaping from the accommodation space 2114 from the first limiting hole 21121 along the first direction X. Specifically, the first limiting gear 21213 and the second limiting gear 21214 are both arranged in the accommodation space 2114, and the first limiting gear 21213 abuts against the first baffle 2112, and the second limiting gear 21214 abuts against the second baffle 2113. Further, the diameter of the first limiting gear 21213 is larger than the diameter of the first limiting hole 21121 and the diameter of the second limiting gear 21214 is larger than the diameter of the second limiting hole 21131, which has the beneficial effect of preventing the roller 2121 from escaping from the accommodation space 2114.

[0049] Optionally, in an embodiment of the present application, the roller 2121 also includes two sliding bearings 2122, and the two sliding bearings 2122 are respectively mounted on both ends of the column 21211; one sliding bearing 2122 is arranged on the side of the first limiting gear 21213 away from the threaded member 21212 and is located behind the first limiting hole 21121, and the other sliding bearing 2122 is arranged on the side of the second limiting gear 21214 away from the threaded member 21212 and is located in the second limiting hole 21131.

[0050] In the embodiment of the present application, two sliding bearings 2122 are respectively sleeved on both ends of the column 21211. Specifically, one sliding bearing 2122 is arranged on the side of the first limiting gear 21213 away from the threaded member 21212, and the other sliding bearing 2122 is arranged on the side of the second limiting gear 21214 away from the threaded member 21212. One sliding bearing 2122 is arranged in the first limiting hole 21121, and the other sliding bearing 2122 is arranged in the second limiting hole 21131. The arrangement of the two sliding bearings 2122 is used to reduce the friction between the roller 2121 and the first baffle 2112 and the second baffle 2113, and also improves the rotation stability of the roller 2121.

[0051] Optionally, in an embodiment of the present application, the driven wheel 2111 includes a first gear portion 21111 and a second gear portion 21112, the first gear portion 21111 and the second gear portion 21112 are fixedly connected, and the gear teeth of the first gear portion 21111 and the gear teeth of the second gear portion 21112 extend away from each other; the first gear portion 21111 is rotatably connected to the output end of the driving device 10, and the second gear portion 21112 is rotatably connected to the first limiting gear 21213 and the second limiting gear 21214; the output end of the driving device 10 drives the first gear portion 21111 to rotate and drives the second gear portion 21112 to rotate so that the roller 2121 rotates.

[0052] In the embodiment of the present application, the first gear portion 21111 is configured to be connected to the output end of the driving device 10, and the second gear portion 21112 is configured to be connected to the first limiting gear 21213 and the second limiting gear 21214. It can be understood that through the configuration of the first gear portion 21111 and the second gear portion 21112, the force of the driving wheel 44 can be transmitted to the roller 2121. In actual application, the driving wheel 44 is connected to the first gear part 21111, and the rotation of the driving wheel 44 drives the first gear part 21111 to rotate. Since the first gear part 21111 and the second gear part 21112 are fixedly connected, the second gear part 21112 also rotates accordingly, and the first limit gear 21213 and the second limit gear 21214 rotatably connected to the second gear part 21112 rotate thereby, thereby driving the column 21211 to rotate, and the threaded member 21212 sleeved on the column 21211 rotates with the rotation of the column 21211, and the screw 22 connected to the threaded member 21212 through a threaded pair translates along the first direction X.

[0053] Alternatively, if Figure 6 As shown, in the embodiment of the present application, the electric power-assisting device 30 includes a power-assisting motor 31, a coupling 32, a worm gear 33 and a worm 34. The power-assisting motor 31 and the worm gear 34 are connected through the coupling 32. The worm gear 34 and the worm gear 33 are movably connected. The worm gear 33 is connected to the driving device 10.

[0054] In the embodiment of the present application, the shaft of the motor is connected to the shaft of the worm 34 through a coupling 32. When used in a passenger car or a vehicle with a small rack force, the power-assisted motor 31 can select a motor with a small torque. When used in a vehicle with a large rack force, the power-assisted motor 31 can select a motor with a large torque. This embodiment does not impose any limitation on this and can be determined according to actual conditions.

[0055] In actual application, when the user turns the steering wheel, the torque is transmitted to the torsion bar inside the electric power assist device 30, and the torsion bar is deformed. The sensor inside the electric power assist device 30 will give a signal to the power assist motor 31, and the power assist motor 31 will assist the user to rotate the shaft of the worm gear 33, so that the driving wheel 44 can be easily rotated, and the driving wheel 44 drives the driven wheel assembly 211 to rotate, and the second gear part 21112 is engaged with the first limit gear 21213 and the second limit gear 21214, driving the column 21211 to rotate, and the threaded part 21212 on the column 21211 drives the screw 22 to move horizontally through the threaded pair, thereby realizing the wheel swing steering.

[0056] Optionally, in an embodiment of the present application, a vehicle is also disclosed, comprising the electric power steering assembly as described above.

[0057] In an embodiment of the present application, the vehicle includes the electric power steering device as described above, and thus the vehicle has all the beneficial effects as described above, which will not be repeated here.

[0058] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0059] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. An electric power steering assembly, characterized in that: It comprises a driving device (10), a transmission device (20) and an electric booster device (30), wherein the transmission device (20) is mounted on the output end of the driving device (10), and the electric booster device (30) is mounted on a position of the driving device (10) close to the transmission device (20); The transmission device (20) comprises a driving wheel (44), a driven mechanism (21) and a screw rod (22); the driving wheel (44) is connected to the driving device (10); the driving wheel (44) is connected to the driven mechanism (21); the driven mechanism (21) is sleeved on the outer circumference of the screw rod (22) and is connected to the screw rod (22) via a threaded pair; the driving device (10) drives the driving wheel (44) to rotate; the driving wheel (44) drives the screw rod (22) to translate along a first direction (X) via the driven mechanism (21); Wherein, the first direction (X) is the axial direction of the screw (22).

2. The electric power steering assembly according to claim 1, characterized in that: The driven mechanism (21) comprises a driven wheel assembly (211) and a transmission assembly (212); the transmission assembly (212) and the driven wheel assembly (211) are sequentially sleeved on the outer circumference of the screw rod (22); the driven wheel assembly (211) is connected to the output end of the driving device (10); the driven wheel assembly (211) and the transmission assembly (212) are rotationally connected; and the transmission assembly (212) and the screw rod (22) are connected via a threaded pair; The rotation of the driven wheel assembly (211) can drive the transmission assembly (212) to rotate so that the screw rod (22) moves in translation along the first direction (X).

3. The electric power steering assembly according to claim 2, characterized in that: The transmission assembly (212) comprises at least two rollers (2121), wherein the rollers (2121) are sandwiched between the screw (22) and the driven wheel assembly (211) along the radial direction of the screw (22), and at least two of the rollers (2121) are arranged opposite to each other along the radial direction of the screw (22); The roller (2121) and the driven wheel assembly (211) are rotatably connected, and the roller (2121) and the screw rod (22) are connected via a threaded pair. The rotation of the driven wheel assembly (211) can drive the roller (2121) to rotate so that the screw rod (22) moves in translation along the first direction (X).

4. The electric power steering assembly according to claim 3, characterized in that: The roller (2121) comprises a column (21211), a threaded member (21212), a first position-limiting gear (21213) and a second position-limiting gear (21214); the threaded member (21212), the first position-limiting gear (21213) and the second position-limiting gear (21214) are sleeved on the column (21211) and are fixedly connected to the column (21211); the threaded member (21212) is sandwiched between the first position-limiting gear (21213) and the second position-limiting gear (21214); and both ends of the threaded member (21212) along the first direction (X) have a preset interval with the first position-limiting gear (21213) and the second position-limiting gear (21214); Wherein, the first limiting gear (21213) and the second limiting gear (21214) are both rotationally connected to the driven wheel assembly (211), and the threaded member (21212) and the screw rod (22) are connected via a threaded pair.

5. The electric power steering assembly according to claim 4, characterized in that: The driven wheel assembly (211) comprises a driven wheel (2111), a first baffle (2112) and a second baffle (2113); the driven wheel (2111), the first baffle (2112) and the second baffle (2113) are all sleeved on the outer periphery of the screw rod (22); the first baffle (2112) and the second baffle (2113) are arranged opposite to each other along the first direction (X); the first baffle (2112) and the second baffle (2113) are both fixedly connected to the driven wheel (2111); The driven wheel (2111), the first baffle (2112), the second baffle (2113) and the screw rod (22) are enclosed to form a receiving space (2114), and at least two rollers (2121) are arranged in the receiving space (2114); The first baffle plate (2112) is provided with a first limiting hole (21121), the second baffle plate (2113) is provided with a second limiting hole (21131), and two ends of the column (21211) pass through the first limiting hole (21121) and the second limiting hole (21131) respectively; Wherein, the number of the first limiting holes (21121) and the number of the second limiting holes (21131) correspond one-to-one to the number of the rollers (2121).

6. The electric power steering assembly according to claim 5, characterized in that: The first position-limiting gear (21213) is clamped on the first baffle plate (2112), and the second position-limiting gear (21214) is clamped on the second baffle plate (2113); Wherein, the diameter of the first limiting gear (21213) is greater than the diameter of the first limiting hole (21121), and the diameter of the second limiting gear (21214) is greater than the diameter of the second limiting hole (21131).

7. The electric power steering assembly according to claim 6, characterized in that: The roller (2121) further comprises two sliding bearings (2122), and the two sliding bearings (2122) are respectively sleeved on two ends of the column (21211); One of the sliding bearings (2122) is arranged on a side of the first limiting gear (21213) away from the threaded member (21212) and is located in the first limiting hole (21121), and the other of the sliding bearings (2122) is arranged on a side of the second limiting gear (21214) away from the threaded member (21212) and is located in the second limiting hole (21131).

8. The electric power steering assembly according to claim 7, characterized in that: The driven wheel (2111) comprises a first gear portion (21111) and a second gear portion (21112), the first gear portion (21111) and the second gear portion (21112) are fixedly connected, and the gear teeth of the first gear portion (21111) and the gear teeth of the second gear portion (21112) extend away from each other; The first gear portion (21111) is rotationally connected to the output end of the driving device (10), and the second gear portion (21112) is rotationally connected to the first position-limiting gear (21213) and the second position-limiting gear (21214); The output end of the driving device (10) drives the first gear portion (21111) to rotate, thereby driving the second gear portion (21112) to rotate, thereby causing the roller (2121) to rotate.

9. The electric power steering assembly according to claim 8, characterized in that: The electric power assist device (30) comprises a power assist motor (31), a coupling (32), a worm wheel (33) and a worm (34); the power assist motor (31) and the worm (34) are connected via the coupling (32); the worm (34) and the worm wheel (33) are movably connected; and the worm wheel (33) is connected to the driving device (10).

10. A vehicle, characterized in that: The invention comprises an electric power steering assembly as claimed in any one of claims 1 to 9.

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