Vehicle rear wheel steering gear pull rod assembly, rear wheel steering gear and vehicle
By using the structure of the shell, lead screw, inner ball head, inner pull rod, outer pull rod and buffer bushing in the rear wheel steering gear, the vibration between the outer pull rod and the steering joint is solved, resulting in the rigid connection of the pull rod assembly The abnormal noise problem has improved the NVH performance and range of the entire vehicle.
Patent Information
- Application Number
- CN202411431753.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-14
- Publication Date
- 2024-12-13
AI Technical Summary
The tie rod assembly in the rear wheel steering is rigidly connected, causing internal sub-parts to vibrate and produce abnormal noise.
Design a vehicle rear wheel steering rod assembly, adopting a structure of a shell, lead screw, inner ball head seat, inner tie rod, outer tie rod and buffer bushing, and buffer vibration between the outer tie rod and steering joint through the buffer bushing , reduce vibration transmitted from the rear wheel steering and wheels.
It effectively reduces the abnormal noise generated by internal vibration of the rear wheel steering gear, and improves the NVH performance of the whole vehicle, saves the vehicle development cost, complies with the lightweight design, and increases the vehicle's cruising range.
Smart Images
Figure CN119117097A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of vehicle technology, and in particular to a vehicle rear wheel steering gear tie rod assembly, a rear wheel steering gear and a vehicle. Background Art
[0002] With the development of the times, more and more cars are equipped with rear-wheel steering. The rear-wheel steering has two basic functions: when the vehicle speed is low, the rear wheel steering angle is controlled to be opposite to the front wheel steering angle to reduce the turning diameter of the vehicle and increase the vehicle's passability; when the vehicle speed is high, the rear wheel steering angle is controlled to be in the same direction as the front wheel steering angle to reduce the vehicle's roll and improve the vehicle's stability and handling performance.
[0003] The rear wheel steering gear assembly includes a motor, an ECU controller, a pinion, a belt, a large pulley reduction mechanism, a lead screw, a pull rod, a displacement sensor and a housing. The ECU controller controls the rotation direction and angle of the motor by calculating and verifying the position of the displacement sensor. The motor drives the coaxial pinion, which drives the large pulley reduction mechanism through the belt to reduce speed and increase torque. The large pulley reduction mechanism converts the rotational torque into a force for the lateral movement of the lead screw. The lateral movement of the lead screw pushes the pull rod, which in turn pushes the rear steering knuckle to steer or return the rear wheel.
[0004] However, the impact of the road on the tire is directly transmitted to the inside of the rear wheel steering gear through the rear steering knuckle and the tie rod. Since the tie rod assembly adopts a rigid connection, it is easy to cause the internal components of the rear wheel steering gear to vibrate and produce abnormal noise. Summary of the invention
[0005] The present application provides a vehicle rear wheel steering gear tie rod assembly, a rear wheel steering gear and a vehicle, which are used to solve the problem that the tie rod assembly adopts a rigid connection, which easily arouses the vibration of internal components of the rear wheel steering gear and produces abnormal noise.
[0006] On the one hand, the present application provides a vehicle rear wheel steering gear tie rod assembly, including a housing, a lead screw, an inner ball seat, an inner tie rod, an outer tie rod and a buffer bushing;
[0007] The housing is used to be arranged on a rear wheel steering gear of a vehicle, the lead screw is inserted into the housing and is slidably connected to a bushing embedded in the housing, and the lead screw is used to be connected to the rear wheel steering gear so as to move laterally relative to the housing under the drive of the rear wheel steering gear;
[0008] The inner ball head seat is arranged at one end of the screw, and a ball head is arranged at one end of the inner tie rod. The ball head is rotatably arranged in the inner ball head seat, and the inner tie rod is connected to the outer tie rod; the buffer bushing is arranged on the outer tie rod to be connected to the steering knuckle of the vehicle and to buffer the force transmitted from the steering knuckle to the outer tie rod.
[0009] In some embodiments, the buffer bushing includes a bushing outer tube, a buffer portion and a bushing inner tube. The bushing outer tube is arranged at one end of the outer tie rod away from the inner tie rod, the bushing inner tube is arranged in the bushing outer tube, the bushing inner tube is used to be connected to the steering knuckle, and the buffer portion is located between the bushing outer tube and the bushing inner tube to connect the bushing outer tube and the bushing inner tube and buffer the force transmitted from the bushing inner tube to the bushing outer tube.
[0010] In some embodiments, both ends of the bushing inner tube extend outside the bushing outer tube, one end of the bushing inner tube is set to a plane, and the other end is set to a conical surface, the end of the conical surface away from the axis of the bushing inner tube is close to the plane, and the conical surface is used to contact the steering knuckle.
[0011] In some embodiments, the outer pull rod includes a first rod body, an avoidance portion, and a second rod body connected in sequence, the first rod body is provided with an installation groove, the buffer bushing is arranged in the installation groove, the avoidance portion is used to avoid the internal structure of the vehicle, the second rod body is provided with a threaded hole, the threaded hole is coaxially arranged with the second rod body, and one end of the inner pull rod is threadedly connected to the threaded hole.
[0012] In some embodiments, a limiting nut is threadedly sleeved on the inner pull rod, and the limiting nut abuts against the end of the second rod body.
[0013] In some embodiments, an inner ball head bowl is disposed in the inner ball head seat, and the inner ball head bowl is located between the ball head and the inner ball head seat for wrapping the ball head, and a storage groove for storing grease is disposed on the ball head.
[0014] In some embodiments, a limiting end surface is provided on one side of the inner ball head seat, the diameter of the limiting end surface is larger than the diameter of the lead screw, and the limiting end surface is used to abut against the end of the shell to limit the position of the lead screw.
[0015] In some embodiments, a protective member is also included, which includes a bellows, a first clamp and a second clamp. One end of the bellows is connected to the shell, and the other end is connected to the inner pull rod. The first clamp is sleeved on one end of the bellows located on the inner pull rod to fix the bellows to the inner pull rod, and the second clamp is sleeved on one end of the bellows located on the shell to fix the bellows to the shell.
[0016] On the one hand, the present application provides a rear-wheel steering gear, comprising a rear-wheel steering gear body and the vehicle rear-wheel steering gear tie rod assembly as described above, which is arranged on the rear-wheel steering gear body.
[0017] On the other hand, the present application provides a vehicle, comprising a vehicle body and a rear wheel steering device as described above arranged on the vehicle body.
[0018] The present application provides a vehicle rear wheel steering gear tie rod assembly, a rear wheel steering gear and a vehicle. The vehicle rear wheel steering gear tie rod assembly sets a housing on the rear wheel steering gear, and connects a lead screw with the power part of the rear wheel steering gear, so that the rear wheel steering gear drives the lead screw to move along the length direction of the lead screw while rotating, and the lead screw drives the inner ball head seat to move, thereby driving the inner tie rod to move through the ball head set in the inner ball head seat, and the inner tie rod drives the outer tie rod to move, and the outer tie rod drives the vehicle's steering knuckle to move through the buffer bushing, thereby realizing the steering of the vehicle. The buffer bushing has the effect of buffering the vibration between the outer tie rod and the steering knuckle, thereby reducing the abnormal noise generated by the internal vibration of the rear wheel steering gear, and at the same time reducing the vibration transmitted by the wheel, and has a buffering effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.
[0020] Figure 1 A schematic diagram of the structure of a rear wheel steering device provided in an embodiment of the present application;
[0021] Figure 2 A schematic structural diagram of a vehicle rear wheel steering tie rod assembly provided in an embodiment of the present application;
[0022] Figure 3 for Figure 2 A partial enlarged view of the ball joint in FIG.
[0023] Figure 4 for Figure 2 Cross-sectional view of the buffer bushing.
[0024] Description of reference numerals:
[0025] 100. Shell;
[0026] 200, screw;
[0027] 300, inner ball head seat; 310, inner ball head bowl; 320, limit end face;
[0028] 400, inner tie rod; 410, ball head; 411, storage tank; 420, limit nut;
[0029] 500, outer pull rod; 510, first rod body; 511, mounting groove; 520, avoidance portion; 530, second rod body; 531, threaded hole;
[0030] 600, buffer bushing; 610, bushing outer tube; 620, buffer portion; 630, bushing inner tube; 631, cone surface; 632, plane surface;
[0031] 700, protective element; 710, bellows; 720, first clamp; 730, second clamp;
[0032] 810, motor; 820, ECU controller; 830, pinion; 840, belt; 850, large pulley speed reduction mechanism; 860, displacement sensor; 870, housing.
[0033] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION
[0034] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.
[0035] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0036] In this application, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0037] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0038] With the development of the times, more and more cars are equipped with rear-wheel steering. The rear-wheel steering has two basic functions: when the vehicle speed is low, the rear wheel steering angle is controlled to be opposite to the front wheel steering angle to reduce the turning diameter of the vehicle and increase the vehicle's passability; when the vehicle speed is high, the rear wheel steering angle is controlled to be in the same direction as the front wheel steering angle to reduce the vehicle's roll and improve the vehicle's stability and handling performance.
[0039] The rear wheel steering gear assembly includes a motor, an ECU controller, a pinion, a belt, a large pulley reduction mechanism, a lead screw, a pull rod, a displacement sensor and a housing. Its working principle is as follows: the host computer calculates the desired rear wheel angle in real time through the vehicle's status, including vehicle speed, steering wheel angle, lateral acceleration, longitudinal acceleration and other signals, and sends the rear wheel angle target signal to the ECU controller of the rear wheel steering gear through the data bus. The ECU controller controls the rotation direction and rotation angle of the motor by calculating and verifying the position of the displacement sensor. The motor drives the coaxial pinion, and drives the large pulley reduction mechanism through the belt to reduce speed and increase torque. The large pulley reduction mechanism converts the rotation torque into a force for the lateral movement of the lead screw. The lateral movement of the lead screw pushes the pull rod, which in turn pushes the rear steering knuckle to steer or return the rear wheel.
[0040] However, the impact of the road on the tire is directly transmitted to the inside of the rear wheel steering gear through the rear steering knuckle and the tie rod. Since the tie rod assembly adopts a rigid connection, it is easy to cause the internal components of the rear wheel steering gear to vibrate and produce abnormal noise.
[0041] In order to solve the above problems, the present application provides a vehicle rear wheel steering gear tie rod assembly, a rear wheel steering gear and a vehicle. The vehicle rear wheel steering gear tie rod assembly sets a housing on the rear wheel steering gear, and connects a lead screw with the power part of the rear wheel steering gear, so that the rear wheel steering gear drives the lead screw to move along the length direction of the lead screw while rotating, and the lead screw drives the inner ball head seat to move, thereby driving the inner tie rod to move through the ball head set in the inner ball head seat, and the inner tie rod drives the outer tie rod to move, and the outer tie rod drives the vehicle's steering knuckle to move through the buffer bushing, thereby realizing the steering of the vehicle. The buffer bushing has the effect of buffering the vibration between the outer tie rod and the steering knuckle, thereby reducing the abnormal noise generated by the internal vibration of the rear wheel steering gear, and at the same time reducing the vibration transmitted by the wheel, and has a buffering effect.
[0042] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.
[0043] On the one hand, the present application provides a vehicle rear wheel steering gear tie rod assembly, which is hereinafter referred to as the tie rod assembly. Figures 2 to 4 The vehicle rear wheel steering tie rod assembly includes a housing 100, a lead screw 200, an inner ball seat 300, an inner tie rod 400, an outer tie rod 500 and a buffer bushing 600;
[0044] The housing 100 is used to be arranged on a rear wheel steering gear of a vehicle, the lead screw 200 is inserted into the housing 100 and is slidably connected to a bushing embedded in the housing 100, and the lead screw 200 is used to be connected to the rear wheel steering gear to move laterally relative to the housing 100 under the drive of the rear wheel steering gear;
[0045] An inner ball head seat 300 is arranged at one end of the screw 200, and a ball head 410 is arranged at one end of the inner tie rod 400. The ball head 410 is rotatably arranged in the inner ball head seat 300, and the inner tie rod 400 is connected to the outer tie rod 500; a buffer bushing 600 is arranged on the outer tie rod 500 for connecting with the steering knuckle of the vehicle and buffering the force transmitted to the outer tie rod 500 by the steering knuckle.
[0046] The housing 100 is fixedly connected to the housing 870 of the rear wheel steering gear by bolts, a tubular plastic bushing is embedded inside the housing 100, and the lead screw 200 is inserted into the tubular plastic bushing. In addition, one end of the lead screw 200 is inserted into the outside of the housing 100 and connected to the inner ball head seat 300, and the other end is inserted into the rear wheel steering gear and is threadedly connected to the driving structure of the rear wheel steering gear, so as to drive the lead screw 200 to rotate on the housing 100 and move along the length direction of the lead screw 200.
[0047] The inner ball head seat 300 is provided with a spherical cavity, and the ball head 410 is rotatably placed in the spherical cavity, and the area of the spherical cavity is greater than half of the area of the ball head 410, and the area of the spherical cavity is less than or equal to three quarters of the area of the ball head 410. This serves to limit the ball head 410, prevent the ball head 410 from moving out of the spherical cavity, and provide a certain position for the rotation of the ball head 410.
[0048] By adopting the above technical solution, the housing 100 is arranged on the rear wheel steering gear, and the lead screw 200 is connected to the power part of the rear wheel steering gear, so that the rear wheel steering gear drives the lead screw 200 to move along the length direction of the lead screw 200 while rotating, and the lead screw 200 drives the inner ball head seat 300 to move, thereby driving the inner tie rod 400 to move through the ball head 410 arranged in the inner ball head seat 300, and the inner tie rod 400 drives the outer tie rod 500 to move, and the outer tie rod 500 drives the steering knuckle of the vehicle through the buffer bushing 600, so as to realize the steering of the vehicle. The buffer bushing 600 has the effect of buffering the vibration between the outer tie rod 500 and the steering knuckle, thereby reducing the abnormal noise generated by the internal vibration of the rear wheel steering gear, and at the same time reducing the vibration transmitted by the wheel, and has a buffering effect.
[0049] Compared with the traditional yoke-type rear wheel steering gear, the inner point of the tie rod of this embodiment is a ball head 410 structure. The inner tie rod 400 can rotate arbitrarily around the inner ball head seat 300. When the outer point of the tie rod needs to adjust the hard point coordinates according to different models of the same platform, only a set of inner tie rod 400 and outer tie rod 500 need to be developed. Compared with the yoke-type rear wheel steering gear, the cost of vehicle development is saved. In addition, compared with the yoke structure, there are fewer eccentric bolts, eccentric washers and nuts. In addition, compared with the yoke and bushing, the weight of the inner ball head seat 300 will be reduced, which is in line with the lightweight design of the vehicle and increases the vehicle's cruising range.
[0050] In addition, when the vehicle passes through bumpy or rough roads, the impact of the road on the tire is transmitted to the buffer bushing 600 through the rear steering knuckle, and the buffer bushing 600 is transmitted to the outer tie rod 500 and the inner tie rod 400, and then transmitted to the inside of the rear wheel steering gear, so as to play a vibration isolation effect to mitigate the impact, which can effectively prevent the impact from causing abnormal vibration and noise of the internal components of the rear wheel steering gear, solve the problem of abnormal vibration and noise of the rear wheel steering gear, and improve the NVH (noise, vibration and harshness) performance of the whole vehicle.
[0051] In some embodiments, reference Figure 2 and Figure 4The buffer bushing 600 includes a bushing outer tube 610, a buffer portion 620 and a bushing inner tube 630. The bushing outer tube 610 is arranged at one end of the outer tie rod 500 away from the inner tie rod 400. The bushing inner tube 630 is arranged in the bushing outer tube 610. The bushing inner tube 630 is used to be connected to the steering knuckle. The buffer portion 620 is located between the bushing outer tube 610 and the bushing inner tube 630 to connect the bushing outer tube 610 and the bushing inner tube 630 and to buffer the force transmitted from the inner tube of the bushing 600 to the bushing outer tube 610.
[0052] Among them, the bushing outer tube 610 is coaxially arranged with the bushing inner tube 630, and the buffer part 620 is fixedly sleeved on the outer side wall of the bushing inner tube 630, and installed in the bushing outer tube 610, and connected with the bushing outer tube 610, so that the bushing outer tube 610 and the bushing inner tube 630 are connected through the buffer part 620, and the buffer part 620 is also a ring-shaped tubular structure. In the embodiment of the present application, the buffer part 620 is a rubber bushing, which is wrapped on the outside of the steel bushing inner tube 630 through a vulcanization process, and is also wrapped and connected by the steel bushing outer tube 610, and finally pressed to the end of the outer tie rod 500 through an interference fit. The rubber bushing has a vibration isolation effect, thereby reducing the abnormal noise caused by the internal vibration of the rear wheel steering gear.
[0053] In some embodiments, reference Figure 4 Both ends of the bushing inner tube 630 extend outside the bushing outer tube 610, one end of the bushing inner tube 630 is set as a plane 632, and the other end is set as a conical surface 631, and the end of the conical surface 631 away from the axis of the bushing inner tube 630 is close to the plane 632, and the conical surface 631 is used to contact the steering knuckle.
[0054] The distance from the end of the conical surface 631 close to the axis of the bushing outer tube 610 to the plane 632 is greater than the distance from the end of the conical surface 631 away from the axis of the bushing outer tube 610 to the plane 632. The bushing inner tube 630 is a tubular structure for bolts to pass through the bushing inner tube 630 and connect to the steering knuckle.
[0055] The conical surface 631 on the bushing inner tube 630 serves the purpose of guiding and centering when installing and tightening the bolts, so that the bolts penetrated through the bushing inner tube 630 are coaxial with the threaded holes on the steering knuckle, ensuring assembly accuracy. At the same time, the cooperation between the conical surface 631 and the steering knuckle increases the contact area, and there will not be a large suction force between the bushing inner tube 630 and the steering knuckle, which is convenient for after-sales maintenance and disassembly of the tie rod assembly. The other end face of the bushing inner tube 630 is a plane 632 to achieve a tight fit with the bolt flange surface.
[0056] In some embodiments, the outer pull rod 500 includes a first rod body 510, an avoidance portion 520 and a second rod body 530 connected in sequence. The first rod body 510 is provided with a mounting groove 511, and the buffer bushing 600 is arranged in the mounting groove 511. The avoidance portion 520 is used to avoid the internal structure of the vehicle. The second rod body 530 is provided with a threaded hole 531, and the threaded hole 531 is coaxially arranged with the second rod body 530. One end of the inner pull rod 400 is threadedly connected in the threaded hole 531.
[0057] Among them, the mounting groove 511 is a hole opened perpendicular to the length direction of the first rod body 510, and the buffer bushing 600 is fixed in the mounting groove 511. The first rod body 510 and the second rod body 530 are preferably located on the same axis. If the layout space does not allow, they can also be coaxial. A threaded hole 531 is set at the end of the second rod body 530 away from the first rod body 510, and the threaded hole 531 is coaxially arranged with the second rod body 530. The end of the inner pull rod 400 away from the housing 100 is set as a threaded rod, and there is a distance between the end of the inner pull rod 400 and the bottom of the threaded hole 531. So that the depth of the inner pull rod 400 extending into the second rod body 530 can be adjusted according to actual needs to be suitable for vehicles with different wheel spacings.
[0058] Compared with the rear wheel steering gear with a yoke structure, the tie rod assembly of this embodiment does not need to assemble the eccentric bolt, eccentric gasket and nut between the yoke and the bushing. The inner and outer tie rods 500 are threadedly connected and each has an open-end wrench fastening structure. They are fastened by adjusting the nuts. When the four-wheel alignment parameters need to be adjusted, it is only necessary to loosen the adjusting nuts and then adjust the length of the inner and outer tie rods 500, and finally tighten the adjusting nuts. The operation is simple and the assembly process of the rear wheel steering gear is reduced.
[0059] Exemplarily, the outer tie rod 500 is designed according to the rod system envelope, the air spring or spring envelope, and the wheel rim envelope of the vehicle's peripheral rear suspension. When the clearance between the outer tie rod 500 and the envelope is sufficient, it can be designed as a straight rod to achieve the same purpose of weight reduction as the two sides of the steering gear; when the clearance between the outer tie rod 500 and the envelope is insufficient, it can be designed as a bent shape. When designing the inner tie rod 400 and the outer tie rod 500, it is necessary to meet the minimum bending strength requirements of the rear suspension rod system of the whole vehicle, and at the same time, it is necessary to meet the requirement that its bending strength is less than the strength of the lead screw 200, so as to protect the middle main body of the rear wheel steering gear during the collision of the whole vehicle, and give priority to bending or breaking the inner tie rod 400 and the outer tie rod 500.
[0060] In some embodiments, a limiting nut 420 is threadedly sleeved on the inner pull rod 400 , and the limiting nut 420 abuts against the end of the second rod body 530 .
[0061] The limiting nut 420 is sleeved on the inner pull rod 400 and abuts against the end of the second rod body 530 , thereby limiting the position of the second rod body 530 and fixing the second rod body 530 .
[0062] In some embodiments, reference Figure 3 An inner ball head bowl 310 is disposed in the inner ball head seat 300 . The inner ball head bowl 310 is located between the ball head 410 and the inner ball head seat 300 for wrapping the ball head 410 . A storage groove 411 for storing grease is disposed on the ball head 410 .
[0063] The inner ball head bowl 310 is made of a wear-resistant plastic material. The inner ball head bowl 310 is fixed on the inner ball head seat 300, and the ball head 410 is rotatably connected in the inner ball head bowl 310. The storage tank 411 stores grease and the inner ball head bowl 310 to improve the wear resistance and durability of the ball head 410. The ball head 410 of the inner tie rod 400 can rotate and swing freely under the constraint of the inner ball head seat 300 to adapt to the up and down jumping and left and right steering of the rear wheel of the vehicle.
[0064] In some embodiments, a limiting end surface 320 is provided on one side of the inner ball head seat 300 , and the diameter of the limiting end surface 320 is larger than the diameter of the screw 200 . The limiting end surface 320 is used to abut against the end of the housing 100 to limit the position of the screw 200 .
[0065] The end of the lead screw 200 extends to the outer end of the housing 100 and provides a displacement distance for the movement of the lead screw 200. The distance between the limit end surface 320 and the housing 100 is the mechanical limit stroke of the rear wheel steering gear. When the software limit fails, the mechanical limit can protect the rear wheel steering gear assembly and prevent the rear wheel steering gear assembly from exceeding its stroke and causing the vehicle to lose control.
[0066] In some embodiments, reference Figure 2 and Figure 3 The tie rod assembly also includes a protective member 700, which includes a bellows 710, a first clamp 720 and a second clamp 730. One end of the bellows 710 is connected to the shell 100, and the other end is connected to the inner tie rod 400. The first clamp 720 is sleeved on one end of the bellows 710 located on the inner tie rod 400 to fix the bellows 710 on the inner tie rod 400. The second clamp 730 is sleeved on one end of the bellows 710 located on the shell 100 to fix the bellows 710 on the shell 100.
[0067] Furthermore, two boss rings are provided at the middle section of the inner tie rod 400, and the smaller end of the bellows 710 is sleeved in the two boss rings, and the first clamp 720 is sleeved between the two boss rings to fix the bellows 710 on the inner tie rod 400. Similarly, the housing 100 is also provided with a boss for limiting the second clamp 730, which will not be described in detail here.
[0068] The bellows 710 is sleeved between the inner tie rod 400 and the housing 100 to achieve sealing, dustproof and waterproof functions, thereby increasing the service life of the tie rod assembly.
[0069] On the one hand, the present application provides a rear wheel steering device, referring to Figure 1 The rear wheel steering gear comprises a rear wheel steering gear body and a vehicle rear wheel steering gear tie rod assembly arranged on the rear wheel steering gear body.
[0070] The rear wheel steering gear body includes a motor 810, an ECU controller 820, a pinion 830, a belt 840, a large pulley speed reduction mechanism 850, a displacement sensor 860 and a housing 870. The vehicle rear wheel steering gear tie rod assembly is hereinafter referred to as the tie rod assembly.
[0071] Among them, the pull rod assembly is set to two, and the two pull rod assemblies share a lead screw 200, which are symmetrically arranged at both ends of the lead screw 200. The motor 810, the ECU controller 820 and the pinion 830 are integrated together to form a motor controller assembly, which is fixed to the housing 870 by bolts. The pinion 830 is a helical tooth, which forms a belt transmission structure with the belt 840 and the large pulley, and has the advantages of good meshing, stable transmission, and low noise. The large pulley is threadedly connected with the trapezoidal lead screw nut, or the planetary roller nut, or the ball screw nut to form a large pulley reduction mechanism 850. The large pulley reduction mechanism 850 is coaxially connected with the lead screw 200, and the rotational motion of the large pulley can be converted into the axial motion of the lead screw 200. The housing 100 is fastened to the housing 870 by bolts, and the pinion 830, the belt 840, the large pulley reduction mechanism 850, and the lead screw 200 are enclosed inside the housing 100. At the same time, 2 to 4 mounting holes are left on the small housing 100 and the outer housing 870, which are fixed to the vehicle body or the rear subframe by bolts. Annular wear-resistant plastic bushings are embedded at both ends of the small housing 100 and the outer housing 870 to support the lead screw 200 so that it can move left and right relative to the small housing 100 and the outer housing 870. A square groove is provided in the middle of the outer housing 870 to embed and fix the displacement sensor 860 to monitor the lateral position of the lead screw in real time. A pull rod assembly is connected to each end of the lead screw. The inner point of the pull rod assembly is a ball head 410 structure, which is threadedly connected to the lead screw 200, and the outer point is a buffer bushing 600 structure, which is connected to the steering knuckle.
[0072] The upper computer calculates the desired rear wheel angle in real time by detecting the status of the entire vehicle, including vehicle speed, steering wheel angle, lateral acceleration, longitudinal acceleration and other signals, and sends the rear wheel angle target signal to the controller of the rear wheel steering gear through the data bus. The controller controls the rotation direction and angle of the motor 810 by calculating and verifying the position of the displacement sensor 860. The motor 810 drives the coaxial pinion 830, and drives the large pulley reduction mechanism 850 through the belt 840 to reduce speed and increase torque. The large pulley reduction mechanism 850 is transmitted through the screw 200 to convert the rotational torque into a force for the lateral movement of the screw 200. The lateral movement of the screw 200 pushes the tie rod assembly, and then pushes the steering knuckle to steer the rear wheels.
[0073] On the other hand, the present application provides a vehicle including a vehicle body and a rear wheel steering gear disposed on the vehicle body.
[0074] Among them, the rear wheel steering gear in this embodiment has the same structure as the rear wheel steering gear provided in any of the above embodiments, and can bring the same or similar technical effects, which will not be described one by one here, and the details can be referred to the description of the above embodiments.
[0075] The present application provides a vehicle, wherein a housing 100 is arranged on a rear wheel steering gear, and a lead screw 200 is connected to a large pulley reduction mechanism 850 of the rear wheel steering gear, and a motor 810 of the rear wheel steering gear drives a pinion 830, and drives the large pulley reduction mechanism 850 to rotate under the transmission of a belt 840, thereby driving the lead screw 200 to move along the length direction of the lead screw 200, and the lead screw 200 drives the inner ball head seat 300 to move, thereby driving the inner tie rod 400 to move through the ball head 410 arranged in the inner ball head seat 300, and the inner tie rod 400 drives the outer tie rod 500 to move, and the outer tie rod 500 drives the steering knuckle of the vehicle through a buffer bushing 600, thereby realizing the steering of the vehicle. The buffer bushing 600 has the effect of buffering the vibration between the outer tie rod 500 and the steering knuckle, thereby reducing the abnormal noise generated by the internal vibration of the rear wheel steering gear, and at the same time reducing the vibration transmitted by the wheel, and has a buffering effect.
[0076] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the present application. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.
[0077] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.
Claims
1. A vehicle rear wheel steering gear tie rod assembly, characterized in that: It comprises a housing (100), a lead screw (200), an inner ball head seat (300), an inner pull rod (400), an outer pull rod (500) and a buffer bushing (600); The housing (100) is used to be arranged on a rear wheel steering gear of a vehicle, the lead screw (200) is inserted into the housing (100) and is slidably connected to a bushing embedded in the housing (100), and the lead screw (200) is used to be connected to the rear wheel steering gear so as to move laterally relative to the housing (100) under the drive of the rear wheel steering gear; The inner ball head seat (300) is arranged at one end of the screw (200), and a ball head (410) is arranged at one end of the inner tie rod (400). The ball head (410) is rotatably arranged in the inner ball head seat (300), and the inner tie rod (400) is connected to the outer tie rod (500); the buffer bushing (600) is arranged on the outer tie rod (500) to be connected to the steering knuckle of the vehicle and to buffer the force transmitted from the steering knuckle to the outer tie rod (500).
2. The vehicle rear wheel steering gear tie rod assembly according to claim 1, characterized in that: The buffer bushing (600) includes a bushing outer tube (610), a buffer portion (620) and a bushing inner tube (630), wherein the bushing outer tube (610) is disposed at one end of the outer tie rod (500) away from the inner tie rod (400), and the bushing inner tube (630) is disposed inside the bushing outer tube (610), and the bushing inner tube (630) is used to be connected to the steering knuckle, and the buffer portion (620) is located between the bushing outer tube (610) and the bushing inner tube (630) to connect the bushing outer tube (610) and the bushing inner tube (630) and to buffer the force transmitted from the bushing inner tube (630) to the bushing outer tube (610).
3. The vehicle rear wheel steering gear tie rod assembly according to claim 2, characterized in that: Both ends of the bushing inner tube (630) extend outside the bushing outer tube (610), one end of the bushing inner tube (630) is set as a plane (632), and the other end is set as a conical surface (631), and the end of the conical surface (631) away from the axis of the bushing inner tube (630) is close to the plane (632), and the conical surface (631) is used to contact the steering knuckle.
4. The vehicle rear wheel steering gear tie rod assembly according to claim 1, characterized in that: The outer pull rod (500) includes a first rod body (510), an avoidance portion (520) and a second rod body (530) which are connected in sequence, the first rod body (510) is provided with a mounting groove (511), the buffer bushing (600) is arranged in the mounting groove (511), the avoidance portion (520) is used to avoid the internal structure of the vehicle, the second rod body (530) is provided with a threaded hole (531), the threaded hole (531) is coaxially arranged with the second rod body (530), and one end of the inner pull rod (400) is threadedly connected in the threaded hole (531).
5. The vehicle rear wheel steering gear tie rod assembly according to claim 4, characterized in that: A limiting nut (420) is threadedly sleeved on the inner pull rod (400), and the limiting nut (420) abuts against the end of the second rod body (530).
6. The vehicle rear wheel steering gear tie rod assembly according to any one of claims 1 to 5, characterized in that: An inner ball head bowl (310) is arranged in the inner ball head seat (300), and the inner ball head bowl (310) is located between the ball head (410) and the inner ball head seat (300) so as to wrap the ball head (410). A storage groove (411) for storing grease is arranged on the ball head (410).
7. The vehicle rear wheel steering gear tie rod assembly according to claim 6, characterized in that: A limiting end surface (320) is provided on one side of the inner ball head seat (300), the diameter of the limiting end surface (320) being larger than the diameter of the lead screw (200), and the limiting end surface (320) being used to abut against the end of the housing (100) to limit the position of the lead screw (200).
8. The vehicle rear wheel steering gear tie rod assembly according to any one of claims 1 to 5, characterized in that: It also includes a protective member (700), which includes a bellows (710), a first clamp (720) and a second clamp (730). One end of the bellows (710) is connected to the shell (100), and the other end is connected to the inner tie rod (400). The first clamp (720) is sleeved on one end of the bellows (710) located on the inner tie rod (400) to fix the bellows (710) to the inner tie rod (400). The second clamp (730) is sleeved on one end of the bellows (710) located on the shell (100) to fix the bellows (710) to the shell (100).
9. A rear wheel steering gear, characterized in that: The invention comprises a rear wheel steering gear body and a vehicle rear wheel steering gear tie rod assembly as claimed in any one of claims 1 to 8 arranged on the rear wheel steering gear body.
10. A vehicle, characterized in that: The invention comprises a vehicle body and the rear wheel steering device as claimed in claim 8 which is arranged on the vehicle body.