Steering gear assembly for vehicle and vehicle with steering gear assembly

Abstract

The utility model discloses a steering gear assembly for a vehicle and the vehicle with the steering gear assembly. The screw rod is rotatably and movably arranged in the shell; the output end of the motor extends into the shell; the transmission device is suitable for enabling the lead screw to be in transmission connection with the output end of the motor, and the transmission device is suitable for driving the lead screw to rotate and move in the axial direction when the output end of the motor rotates. The pre-tightening device is arranged in the shell and provided with a pressing part, and the pressing part can move relative to the pre-tightening device and is suitable for applying pre-tightening force to the transmission device. According to the steering gear assembly designed by the utility model, the pressing part of the pre-tightening device can apply the pre-tightening force to the transmission device, the situation that the motor is moved by production equipment to apply the pre-tightening force to the transmission device is avoided, the production efficiency of the steering gear assembly is improved, and the pre-tightening device can continuously apply the pre-tightening force to the transmission device after the motor is replaced, so that the production cost is reduced. The whole steering gear assembly is prevented from being replaced, and the maintenance cost of the steering gear assembly is reduced.

Description

Technical Field

[0001] The utility model relates to the field of vehicles, in particular to a steering gear assembly for a vehicle and a vehicle having the same. Background Art

[0002] In related technologies, the steering system is a key system of the automobile, and its performance can directly affect the driver's experience of operating the vehicle. The R-EPS steering gear is mainly composed of a transmission belt, a transmission pulley, a screw, a motor controller, a torque sensor and other structures. During installation, it is necessary to use equipment to tighten the motor to apply a certain pre-tightening force to the transmission belt. However, after the steering system has been used for a period of time, the transmission belt and the transmission mechanism will wear out, which will cause the transmission belt tension to decrease, and there is a risk of abnormal noise; and after the motor controller fails, the production equipment needs to clamp the motor to ensure that the transmission belt has a certain tension. Therefore, after the motor controller has a problem, it cannot be repaired on the vehicle by replacing the motor controller. At this time, the steering gear assembly needs to be replaced, but the cost of replacing the steering gear assembly is high. Utility Model Content

[0003] The present invention aims to address at least one of the technical problems existing in the prior art. To this end, one objective of the present invention is to provide a steering gear assembly for a vehicle. According to the steering gear assembly designed in the present invention, the pressing portion of the preload device can apply a preload force to the transmission device, eliminating the need to move the motor in production equipment to apply the preload force to the transmission device. This improves the production efficiency of the steering gear assembly. Furthermore, after the motor is replaced, the preload device can continue to apply the preload force to the transmission device, eliminating the need to replace the entire steering gear assembly and reducing the maintenance cost of the steering gear assembly.

[0004] The utility model also provides a vehicle with the steering gear assembly.

[0005] According to the utility model, the steering gear assembly includes: a housing; a screw rod, which is rotatably and movably arranged in the housing; a motor, which is arranged in the housing, and the output end of the motor extends into the housing; a transmission device, which is arranged in the housing and is suitable for transmission-connecting the screw rod with the output end of the motor, and the transmission device is suitable for driving the screw rod to rotate and move axially when the output end of the motor rotates; a pre-tightening device, which is arranged in the housing and has a clamping part, and the clamping part can move relative to the pre-tightening device and is suitable for cooperating with the transmission device to apply a pre-tightening force to the transmission device.

[0006] According to the steering gear assembly of the present invention, a pre-tightening device is arranged in the shell, and the pressing part of the pre-tightening device is movable and cooperates with the transmission device to apply a pre-tightening force to the transmission device, thereby avoiding the use of production equipment to move the motor to apply the pre-tightening force to the transmission device, thereby improving the production efficiency of the steering gear assembly, and the motor can be directly disassembled when the motor controller fails, thereby avoiding the disassembly of the entire steering gear assembly, thereby improving the maintenance efficiency of the steering gear assembly, and the pre-tightening device can continue to apply the pre-tightening force to the transmission device after replacing the motor, thereby avoiding the replacement of the entire steering gear assembly, thereby reducing the maintenance cost of the steering gear assembly, and at the same time, the pre-tightening device can continuously maintain the tension of the transmission device, thereby avoiding abnormal noise due to loosening of the transmission device, and can ensure the transmission efficiency between the motor and the screw rod, thereby ensuring the steering effect of the wheel.

[0007] According to some embodiments of the present invention, the pre-tightening device includes: a mounting shell, which is arranged in the shell; a rotating arm, which is rotatably connected to the mounting shell, and the free end of the rotating arm is provided with the clamping part, and the extension direction of the clamping part is parallel to the extension direction of the screw rod.

[0008] According to some embodiments of the present invention, the pre-tightening device further includes: a reset member, which is disposed in the mounting shell, one end of the reset member is connected to the mounting shell, and the other end of the reset member is connected to the rotating arm.

[0009] According to some embodiments of the present invention, the pre-tightening device further includes: a rotating sleeve, which is arranged on the outer periphery of the pressing portion, and the rotating sleeve is suitable for rotating when the transmission device is working to reduce friction on the transmission device.

[0010] According to some embodiments of the present utility model, the shell includes: a shell body, an installation cavity is provided in the shell body, the motor, the transmission device and the pre-tightening device are respectively accommodated in the installation cavity, and the shell body is also provided with an installation port connected to the installation cavity; an end cover, the end cover is provided on the shell body and is suitable for closing the installation port.

[0011] According to some embodiments of the present invention, the rotating arm includes: a first arm, one end of the first arm is rotatably connected to the mounting shell, and the other end of the first arm is provided with the clamping portion; a second arm, the second arm has an angle with the first arm, the second arm is provided at one end of the first arm, and the free end of the second arm is provided with an adjustment portion; wherein the end cover is provided with an adjustment hole passing through in the thickness direction, and the axial projection of the adjustment portion is located within the adjustment hole.

[0012] According to some embodiments of the present invention, the utility model further comprises: a sealing member connected to the end cover and suitable for closing the adjustment hole.

[0013] According to some embodiments of the present invention, the transmission device includes: a transmission pulley, which is rotatably connected to the screw; a transmission belt, one end of which is in transmission cooperation with the transmission pulley, and the other end of which is in transmission cooperation with the output end of the motor; wherein the clamping portion is suitable for applying a pre-tightening force to the transmission belt.

[0014] According to some embodiments of the present invention, a transmission groove is provided on the inner peripheral wall of the transmission pulley, and the transmission device further includes: a ball, which is provided in the transmission groove and is suitable for cooperating with the screw rod.

[0015] A vehicle according to another embodiment of the present invention will be briefly described below.

[0016] The vehicle according to the present invention includes the steering gear assembly described in any one of the above embodiments. Since the vehicle according to the present invention is provided with the steering gear assembly of the above embodiments, the steering gear assembly of the vehicle is easy to maintain, thereby improving the maintenance efficiency of the vehicle.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 1 is a schematic structural diagram of a steering gear assembly according to an embodiment of the present utility model;

[0020] Figure 2 1 is an exploded view of a pre-tightening device according to an embodiment of the present utility model.

[0021] Reference numerals: 1, steering gear assembly;

[0022] 11. Shell body; 12. End cover;

[0023] 20. Screw; 30. Motor;

[0024] 41. Transmission pulley; 42. Transmission belt;

[0025] 50. Preload device; 51. Mounting housing; 521. First arm; 5211. Pressing portion; 522. Second arm; 5221. Adjusting portion; 53. Resetting member; 54. Rotating sleeve; 55. First screw; 56. Second screw; 57. Limiting cover; 58. Rotating bearing;

[0026] 60. Seals. DETAILED DESCRIPTION

[0027] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0030] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or mutual communication; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to the specific circumstances.

[0031] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0032] In related technologies, the steering system is a key system of the automobile, and its performance can directly affect the driver's experience of operating the vehicle. The R-EPS steering gear is mainly composed of a transmission belt, a transmission pulley, a screw, a motor controller, a torque sensor and other structures. During installation, it is necessary to use equipment to tighten the motor to apply a certain pre-tightening force to the transmission belt. However, after the steering system has been used for a period of time, the transmission belt and the transmission mechanism will wear out, which will cause the transmission belt tension to decrease, and there is a risk of abnormal noise; and after the motor controller fails, the production equipment needs to clamp the motor to ensure that the transmission belt has a certain tension. Therefore, after the motor controller has a problem, it cannot be repaired on the vehicle by replacing the motor controller. At this time, the steering gear assembly needs to be replaced, but the cost of replacing the steering gear assembly is high.

[0033] Reference below Figure 1-Figure 2 A steering gear assembly 1 for a vehicle according to an embodiment of the present invention is described.

[0034] like Figure 1-Figure 2 As shown, the steering gear assembly 1 according to the present invention includes: a housing, a screw rod 20, a motor 30, a transmission device and a pre-tightening device 50, at least part of the screw rod 20 is rotatably and movably arranged in the housing, and the two ends of the screw rod 20 are respectively connected to the wheels, the motor 30 is arranged in the housing, and the output end of the motor 30 extends into the housing, the transmission device is arranged in the housing and is suitable for transmission connection between the screw rod 20 and the output end of the motor 30, the transmission device is suitable for driving the screw rod 20 to rotate and move axially when the output end of the motor 30 rotates, the pre-tightening device 50 is arranged in the housing and has a clamping portion 5211, the clamping portion 5211 can move relative to the pre-tightening device 50 and is suitable for cooperating with the transmission device to apply a pre-tightening force to the transmission device.

[0035] In some embodiments, the output end of the motor 30 extends into the housing and is connected to the screw rod 20 through a transmission device. The transmission device can be a pulley mechanism. In this case, the transmission device includes a transmission belt 42 and a transmission pulley 41. One end of the transmission belt 42 is matched with the output end of the motor 30, and the other end of the transmission belt 42 is matched with the transmission pulley 41. When the motor 30 is working, the output end can rotate, and the output end drives the transmission pulley 41 to rotate through the transmission belt 42. The rotation of the transmission pulley 41 is suitable for driving the screw rod 20 to rotate and move axially. The screw rod 20 moves axially to drive the wheel to deflect.

[0036] The clamping portion 5211 of the clamping device can move toward the transmission belt 42 and apply a pre-tightening force to the transmission belt 42 to ensure that the pulley mechanism can operate normally. Compared with the solution in which the production equipment clamps the motor 30 and drives the motor 30 to move to apply a pre-tightening force to the transmission belt 42, in this application, after the transmission belt 42 is assembled, the pre-tightening device 50 can automatically apply a pre-tightening force to the transmission belt 42, and there is no need to use production equipment to move the motor 30, making the assembly of the transmission belt 42 and the motor 30 more convenient, thereby improving the production efficiency of the steering gear assembly 1.

[0037] At the same time, if the controller of the motor 30 fails, it is only necessary to move the pressing portion 5211 away from the transmission belt 42 to loosen the transmission belt 42, thereby allowing the motor 30 to be directly removed from the housing, avoiding the need to disassemble the entire steering gear assembly 1, thereby improving the maintenance efficiency of the motor 30. At the same time, the replacement motor 30 can be directly assembled to the housing, and after the motor 30 is assembled to the housing, the pre-tightening device 50 can apply a pre-tightening force to the transmission pulley 41 to ensure the normal operation of the pulley mechanism, eliminating the need to replace the entire steering gear assembly 1, thereby reducing vehicle maintenance costs. (In traditional solutions, since it is impossible or difficult to apply a pre-tightening force to the transmission belt after the motor is replaced, it is difficult to repair the steering gear assembly and may even require replacement of the entire steering gear assembly.)

[0038] It is worth noting that after the steering gear assembly 1 has been working for a period of time, the transmission belt 42 will be worn, resulting in a decrease in the tension of the transmission belt 42. However, the clamping portion 5211 of the present application can continue to move toward the transmission belt 42 when the tension of the transmission belt 42 decreases, thereby allowing the transmission belt 42 to continue to maintain a tensioned state, avoiding abnormal noise from the transmission belt 42 when working, thereby avoiding abnormal noise from the steering gear assembly 1 when working, and improving the user experience.

[0039] In other embodiments, the transmission device can also be a sprocket mechanism. In this case, the transmission device includes a chain and a sprocket. One end of the chain is connected to the output end of the motor 30, and the other end of the chain is connected to the sprocket. When the motor 30 is working, the output end can be rotated. The rotation of the output end drives the sprocket to rotate through the chain. The rotation of the sprocket can drive the screw rod 20 to rotate and move axially. There is no limitation here.

[0040] It is worth mentioning that whether it is a sprocket mechanism or a pulley mechanism, when its tension decreases, the transmission efficiency between the motor 30 and the screw 20 will decrease. However, the pre-tightening device 50 of the present application can continuously maintain the tension of the transmission device, thereby ensuring the transmission efficiency between the motor 30 and the screw 20, and further ensuring the steering effect of the wheel.

[0041] It is worth noting that the clamping part 5211 can move relative to the pre-tightening device 50. The movement here can include simple movement and rotation, that is, the clamping part 5211 can move or rotate relative to the pre-tightening device 50 toward the transmission device and cooperate with the transmission device to apply pre-tightening force to the transmission device. There is no restriction here.

[0042] According to the steering gear assembly 1 involved in the present invention, a pre-tightening device 50 is arranged in the shell, and the pressing part 5211 of the pre-tightening device 50 is movable and cooperates with the transmission device to apply a pre-tightening force to the transmission device, thereby avoiding the use of production equipment to move the motor 30 to apply a pre-tightening force to the transmission device, thereby improving the production efficiency of the steering gear assembly 1, and the motor 30 can be directly disassembled when the motor 30 controller fails, thereby avoiding the disassembly of the entire steering gear assembly 1, thereby improving the maintenance efficiency of the steering gear assembly 1, and after replacing the motor 30, the pre-tightening device 50 can continue to apply a pre-tightening force to the transmission device, thereby avoiding the replacement of the entire steering gear assembly 1, thereby reducing the maintenance cost of the steering gear assembly 1, and at the same time, the pre-tightening device 50 can continuously maintain the tension of the transmission device, thereby avoiding abnormal noise due to loosening of the transmission device, and can ensure the transmission efficiency between the motor 30 and the screw rod 20, thereby ensuring the steering effect of the wheel.

[0043] According to some embodiments of the present invention, Figure 1-Figure 2 As shown, the pre-tightening device 50 includes: a mounting shell 51 and a rotating arm, the mounting shell 51 is arranged in the shell, the rotating arm is rotatably connected to the mounting shell 51, and the free end of the rotating arm is provided with a clamping portion 5211, and the extension direction of the clamping portion 5211 is parallel to the extension direction of the screw rod 20.

[0044] In some embodiments, the mounting shell 51 is fixedly disposed in the shell, and the rotating arm is rotatably disposed on the mounting shell 51, whereby the rotating arm can rotate relative to the shell, and the clamping portion 5211 rotates with the rotating arm and cooperates with the transmission device to apply a pre-tightening force to the transmission device.

[0045] Preferably, a limiting block is provided on the mounting shell 51, and a limiting groove is provided in the shell. After the mounting shell 51 is accommodated in the shell, the limiting block is accommodated in the limiting groove. When the mounting shell 51 has a tendency to rotate relative to the shell, the outer peripheral wall of the limiting block is suitable for abutting against the inner peripheral wall of the limiting groove to prevent the mounting shell 51 from rotating relative to the shell, thereby ensuring the pre-tightening effect of the clamping part 5211 on the transmission device.

[0046] According to some embodiments of the present invention, Figure 1-Figure 2 As shown, the pre-tightening device 50 further includes: a reset member 53, which is disposed in the mounting shell 51, with one end of the reset member 53 connected to the mounting shell 51, and the other end of the reset member 53 connected to the rotating arm.

[0047] In some embodiments, the reset member 53 can be constructed as a torsion spring or a torsion bar, etc. When the reset member 53 is constructed as a torsion spring, one end of the torsion spring is connected to the mounting shell 51, and the other end of the torsion spring is connected to the rotating arm. The torsion spring has a reset force after assembly, and the rotating arm is suitable for rotating under the action of the reset force of the torsion spring and cooperating with the transmission device, thereby maintaining the pre-tightening force of the rotating arm on the transmission device.

[0048] It is worth noting that a first threaded hole is provided in the shell, and the first screw 55 passes through the rotating arm, the reset member 53 and the mounting shell 51 in sequence and is threadedly connected to the first threaded hole, thereby fixing the pre-tightening device 50 in the shell.

[0049] According to some embodiments of the present invention, Figure 1-Figure 2 As shown, the preload device 50 further includes a rotating sleeve 54, which is sleeved on the outer periphery of the pressing portion 5211. The rotating sleeve 54 is adapted to rotate when the transmission device is operating to reduce friction on the transmission device. It is understood that the outer periphery of the pressing portion 5211 is sleeved with the rotating sleeve 54, which can rotate relative to the pressing portion 5211, and the outer peripheral wall of the rotating sleeve 54 is adapted to abut against the transmission device. When the transmission device is operating, the rotating sleeve 54 can rotate relative to the pressing portion 5211, thereby making the friction between the pressing portion 5211 and the transmission device rolling friction, thereby reducing the friction between the pressing portion and the transmission device, thereby reducing wear on the transmission device.

[0050] In some embodiments, a second threaded hole is provided at the free end of the pressing portion 5211, and a limiting cover 57 is also provided at the free end of the pressing portion 5211. The limiting rod is suitable for limiting and preventing the rotating sleeve 54 from moving along the extension direction of the pressing portion 5211, thereby preventing the rotating sleeve 54 from separating from the pressing portion 5211. A rotating bearing 58 is also provided between the limiting cover 57 and the free end of the pressing portion 5211. The second screw 56 passes through the limiting cover 57 and the rotating bearing 58 in sequence and is threadedly connected to the second threaded hole to fix the limiting cover 57 to the free end of the pressing portion 5211.

[0051] According to some embodiments of the present invention, Figure 1-Figure 2 As shown, the shell includes: a shell body 11 and an end cover 12. The shell body 11 is provided with an installation cavity, and the motor 30, the transmission device and the pre-tightening device 50 are respectively accommodated in the installation cavity. The shell body 11 is also provided with an installation port connected to the installation cavity. The end cover 12 is provided on the shell body 11 and is suitable for closing the installation port.

[0052] It can be understood that the shell includes a shell body 11 and an end cover 12, and an installation cavity is formed in the shell body 11. When producing the steering gear assembly 1, the motor 30, the transmission device and the pre-tightening device 50 are first installed in the installation cavity and then the end cover 12 is connected to the shell body 11, thereby closing the installation port. The steering gear assembly 1 is simple to assemble, which improves the production efficiency and disassembly and maintenance efficiency of the steering gear assembly 1.

[0053] According to some embodiments of the present invention, Figure 1-Figure 2 As shown, the rotating arm includes: a first arm 521 and a second arm 522, one end of the first arm 521 is rotatably connected to the mounting shell 51, the other end of the first arm 521 is provided with a clamping portion 5211, the second arm 522 and the first arm 521 have an included angle, the second arm 522 is provided at one end of the first arm 521, and the free end of the second arm 522 is provided with an adjusting portion 5221; wherein the end cover 12 is provided with an adjusting hole penetrating in the thickness direction, and the axial projection of the adjusting portion 5221 is located in the adjusting hole.

[0054] It can be understood that when the motor 30 needs to be disassembled and repaired, it is only necessary to rotate the adjusting part 5221 through the adjusting hole. The rotation of the adjusting part 5221 can rotate the second arm 522. When the second arm 522 rotates, it can drive the first arm 521 to rotate, so that the clamping part 5211 moves away from the transmission device. At this time, the tensioning force of the transmission device decreases and remains in a relaxed state, which facilitates the output end of the motor 30 to be disengaged from the transmission device, so that the motor 30 can be directly disassembled from the housing, avoiding the disassembly of the entire steering gear assembly 1, improving the disassembly and maintenance efficiency of the motor 30, and thus improving the maintenance efficiency of the steering gear assembly 1.

[0055] According to some embodiments of the present invention, Figure 1-Figure 2As shown, the steering gear assembly 1 further includes a seal 60 connected to the end cap 12 and adapted to seal the adjustment hole. It is understood that the seal 60 can seal the adjustment hole, thereby isolating the mounting cavity from the external environment, preventing rainwater or dust from the external environment from entering the mounting cavity and affecting the transmission device, etc., thereby improving the operational stability of the steering gear assembly 1. Furthermore, isolating the mounting cavity from the external environment can slow the aging of the transmission device, etc., thereby extending the service life of the transmission device, etc., and thereby extending the service life of the steering gear assembly 1. It is worth noting that the seal 60 can be made of rubber, etc., without limitation herein.

[0056] According to some embodiments of the present invention, Figure 1-Figure 2 As shown, the transmission device includes a drive pulley 41 and a drive belt 42. The drive pulley 41 is rotatably connected to the screw 20. One end of the drive belt 42 is in driving engagement with the drive pulley 41, and the other end of the drive belt 42 is in driving engagement with the output end of the motor 30. The pressing portion 5211 is adapted to apply a preload force to the drive belt 42. It will be appreciated that when the motor 30 is operating, the output end can rotate. This rotation of the output end can drive the drive pulley 41 via the drive belt 42. This rotation of the drive pulley 41 can drive the screw 20 to rotate and move axially, thereby driving the wheel to steer. The pressing portion 5211 is adapted to apply a preload force to the drive belt 42 to maintain the tension of the drive belt 42.

[0057] According to some embodiments of the present invention, Figure 1-Figure 2 As shown, the inner circumferential wall of the transmission pulley 41 is provided with a transmission groove, and the transmission device further includes: balls, which are arranged in the transmission groove and are suitable for cooperating with the screw rod 20. It can be understood that the inner circumferential wall of the transmission pulley 41 is provided with a transmission groove extending radially away from the center of the circle of the transmission pulley 41, and a plurality of balls are rotatably arranged in the transmission groove. When the transmission pulley 41 rotates, the plurality of balls can rotate. The plurality of balls rotate and are suitable for cooperating with the threads of the outer circumferential wall of the screw rod 20 to rotate and move the screw rod 20 in the axial direction.

[0058] The vehicle according to the present invention is briefly described below.

[0059] The vehicle according to the present invention is provided with the steering gear assembly 1 of the above embodiment. Since the vehicle according to the present invention is provided with the steering gear assembly 1 described in any one of the above embodiments, the steering gear assembly 1 of the vehicle is easy to maintain, thereby improving the maintenance efficiency of the vehicle.

[0060] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0061] While embodiments of the present invention have been shown and described above, changes, modifications, substitutions, and variations may be made to the embodiments described above.

Claims

1. A steering gear assembly for a vehicle, characterized in that: include: case; a screw rod (20), the screw rod (20) being rotatably and movably disposed in the housing; a motor (30), the motor (30) being disposed in the housing, and an output end of the motor (30) extending into the housing; a transmission device, the transmission device being arranged in the housing and being adapted to transmission-connect the screw rod (20) to the output end of the motor (30), the transmission device being adapted to drive the screw rod (20) to rotate and move axially when the output end of the motor (30) rotates; A pre-tightening device (50) is provided in the housing and has a pressing portion (5211), wherein the pressing portion (5211) is movable relative to the pre-tightening device (50) and is adapted to cooperate with the transmission device to apply a pre-tightening force to the transmission device.

2. The steering gear assembly for a vehicle according to claim 1, characterized in that The pre-tightening device (50) comprises: a mounting shell (51), the mounting shell (51) being disposed in the housing; A rotating arm is rotatably connected to the mounting shell (51), and the free end of the rotating arm is provided with the pressing portion (5211), and the extending direction of the pressing portion (5211) is parallel to the extending direction of the screw rod (20).

3. The steering gear assembly for a vehicle according to claim 2, characterized in that The pre-tightening device (50) further includes: a reset member (53), the reset member (53) being arranged in the mounting shell (51), one end of the reset member (53) being connected to the mounting shell (51), and the other end of the reset member (53) being connected to the rotating arm.

4. The steering gear assembly for a vehicle according to claim 3, characterized in that The pre-tightening device (50) further comprises: a rotating sleeve (54), the rotating sleeve (54) being sleeved on the outer periphery of the pressing portion (5211), the rotating sleeve (54) being adapted to rotate when the transmission device is operating to reduce friction on the transmission device.

5. The steering gear assembly for a vehicle according to claim 2, characterized in that The housing comprises: A housing body (11), wherein a mounting cavity is provided in the housing body (11), the motor (30), the transmission device, and the pre-tightening device (50) are respectively accommodated in the mounting cavity, and the housing body (11) is further provided with a mounting port communicating with the mounting cavity; An end cover (12) is provided on the housing body (11) and is suitable for closing the installation opening.

6. The steering gear assembly for a vehicle according to claim 5, characterized in that The rotating arm comprises: a first arm (521), one end of the first arm (521) being rotatably connected to the mounting shell (51), and the other end of the first arm (521) being provided with the pressing portion (5211); A second arm (522), wherein an included angle is formed between the second arm (522) and the first arm (521), the second arm (522) is provided at one end of the first arm (521), and an adjusting portion (5221) is provided at the free end of the second arm (522); The end cover (12) is provided with an adjustment hole penetrating in the thickness direction, and the projection of the adjustment portion (5221) in the axial direction is located within the adjustment hole.

7. The steering gear assembly for a vehicle according to claim 6, characterized in that Also includes: A sealing member (60) is connected to the end cover (12) and is suitable for closing the adjustment hole.

8. The steering gear assembly for a vehicle according to claim 1, wherein: The transmission device comprises: a transmission pulley (41), the transmission pulley (41) being rotatably connected to the screw rod (20); A transmission belt (42), one end of the transmission belt (42) is in transmission cooperation with the transmission pulley (41), and the other end of the transmission belt (42) is in transmission cooperation with the output end of the motor (30); wherein The pressing portion (5211) is suitable for applying a pre-tightening force to the transmission belt (42).

9. The steering gear assembly for a vehicle according to claim 8, wherein: The inner peripheral wall of the transmission pulley (41) is provided with a transmission groove, and the transmission device further comprises: a ball, which is provided in the transmission groove and is suitable for cooperating with the screw rod (20).

10. A vehicle, characterized in that: A steering gear assembly for a vehicle comprising any one of claims 1-9.

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