Rear axle steering system and vehicle with active steering and return functions

Abstract

The present application relates to a rear axle steering system with active steering and return functions, which includes: the rear axle assembly includes an I-beam, and the I-beam has a concave curved section; the steering gear bracket is arranged parallel to the upper part of the rear axle assembly, and a groove is formed at the bottom thereof; when the steering gear bracket is installed on the rear axle assembly, the groove and the concave curved section form a swing space for the vertical arm arrangement; the steering gear assembly includes a driving device and a steering vertical arm device arranged on the steering gear bracket; the steering vertical arm device is located in the swing space for the vertical arm arrangement and is connected to a steering gear tie rod. Thus, when in use, the driving device of the steering gear assembly drives the steering knuckle connected to the steering gear tie rod to realize the steering and return functions; it is completely out of the mindset of fixing the steering gear on the frame, the steering gear is fixed on the axle, the connection between the steering gear and the axle is not affected by the deformation of the suspension, it is easy to control the steering, and the relative steering angle is accurate; the axle is slightly modified, reducing the manufacturing cost.

Description

Technical Field

[0001] The present application relates to the field of automobile steering systems, and in particular to a rear axle steering system and a vehicle with active steering and return functions. Background Art

[0002] At present, most common vehicles have front-axle steering systems, such as the 6X4 model used in the sanitation vehicle market. The 6X4 sanitation vehicle has a low speed and many turns during operation, which easily causes abnormal wear of the rear wheels, and the large turning diameter is not conducive to operation in urban areas.

[0003] In some related technologies, the rear axle of the rare 6x2R model is only a follow-up steering, without active steering and self-centering functions. Although it has some improvement on improving tire wear, the effect is not ideal. Because the rear axle steering system is set on the frame, the steering gear layout, steering rod, whether the rear axle is steering, and rear axle locking control of the steering system on the frame all need to be integrated with other structures of the frame, resulting in a complex structure. It is also difficult to control to avoid interference, so this type of model is rare on the market. Summary of the invention

[0004] The embodiments of the present application provide a rear-axle steering system and a vehicle with active steering and self-centering functions, so as to solve the problem in the related art that the rear wheels of vehicles with rear-axle steering systems wear abnormally fast and do not have active steering and self-centering functions.

[0005] In a first aspect, a rear axle steering system with active steering and return functions is provided, comprising:

[0006] A rear axle assembly including an I-beam having a concave curved section;

[0007] A steering gear bracket is arranged parallel to the rear axle assembly and has a groove formed at its bottom; when the steering gear bracket is installed on the rear axle assembly, the groove and the concave curved section form a swing space for the vertical arm arrangement;

[0008] The steering gear assembly comprises a driving device arranged on the steering gear bracket, the driving device is connected to a steering drop arm device in a transmission manner; the steering drop arm device is located in the drop arm arrangement swing space and is connected to a steering gear tie rod.

[0009] In some embodiments, the rear steering axle further includes a locking device;

[0010] The rear axle assembly also includes a left steering knuckle, a right steering knuckle, a left lower knuckle arm, a right lower knuckle arm and a tie rod assembly;

[0011] The left lower arm and the right lower arm are arranged at the two ends of the I-beam in the length direction; a part of the left lower arm or the right lower arm forms a tie rod arm section, and one end of the steering gear tie rod away from the steering drop arm device is connected to the tie rod arm section;

[0012] The tie rod assembly comprises a tie rod, and two ends of the tie rod are connected to a left lower arm and a right lower arm through a ball head assembly; the locking device is used to lock or release the tie rod.

[0013] In some embodiments, a front vertical plane is provided on the steering gear bracket and on the side surface in the length direction of the vehicle, and a first mounting hole and a swing opening for avoiding the output end of the steering drop arm device and the steering gear tie rod are provided on the front vertical plane, and the swing opening is communicated with the groove;

[0014] The locking device is installed on the steering gear bracket through the first mounting hole.

[0015] In some embodiments, the steering gear bracket includes a first section, a second section and a third section; the first section and the third section are located on both sides of the second section and are located in the same plane; the second section is raised, and the groove is formed at its bottom, and the front vertical plane is located on the second section.

[0016] In some embodiments, the I-beam is provided with two plate supporting surfaces correspondingly connected to the first section and the third section, and the concave curved section is located between the two plate supporting surfaces.

[0017] In some embodiments, a second mounting hole is provided on the portion of the I-beam where the recessed curved section is provided, and the locking device is installed on the I-beam through the second mounting hole.

[0018] In some embodiments, the locking device includes a locking tongue, a locking bracket, an air chamber assembly, and a locking pin;

[0019] The locking bracket is provided with an air chamber assembly, the bottom of which is equipped with a locking pin, and the air chamber assembly is used to push the locking pin to move downward; one end of the lock tongue is fixedly connected to the horizontal tie rod; the other end of the lock tongue is used to extend into the locking bracket, and the other end of the lock tongue is provided with a slot that is engaged with the locking pin.

[0020] In some embodiments, the drive device includes a steering gear body, a steering gear mounting hole, a motor device and a steering gear fixing bolt;

[0021] The input shaft end of the steering gear body is provided with a motor device, and the output shaft on the steering gear body is used to connect the steering drop arm device; the motor device is provided with an electronic control component, and the electronic control component is used to control the rotation angle of the input shaft of the steering gear body to control the steering drop arm device;

[0022] The steering gear body is connected to the steering gear bracket through the steering gear mounting hole and the steering gear fixing bolts.

[0023] In some embodiments, the steering drop arm device includes a steering drop arm, one end of the steering drop arm is connected to the output shaft on the steering gear body through a steering drop arm locking nut, and the other end of the steering drop arm extends out of the drop arm arrangement swing space and is connected to the steering gear tie rod.

[0024] In a second aspect, a vehicle is provided, which includes: a rear axle steering system with active steering and self-centering functions.

[0025] The beneficial effects of the technical solution provided by this application include:

[0026] The embodiment of the present application provides a rear axle steering system with active steering and self-centering functions. By utilizing the I-beam of the axle, an installation position of the steering gear bracket is provided, and the steering gear bracket has a groove, which cooperates with the concave curved section of the I-beam to form a swing space for the vertical arm arrangement, so that the steering vertical arm can be connected to the steering gear tie rod; in addition, the steering gear bracket provides an installation position for the steering gear assembly; so that when in use, the driving device of the steering gear assembly drives the steering knuckle connected to the steering gear tie rod to achieve the steering and self-centering functions; thereby providing a new axle, suspension, and steering assembly method, the layout structure of the steering gear is not affected by the traditional frame, and is completely separated from the thinking mode of fixing the steering gear on the frame. The steering gear is fixed on the axle, and the connection between the steering gear and the axle is not affected by the deformation of the suspension, so that the steering is easy to control and the relative steering angle is accurate; the existing axle structure is utilized to meet the design requirements, the axle is slightly modified, and the vehicle manufacturing cost is controlled; it can be used on the rear steering axle of the 6x2R model, which has a great improvement effect on the fast wear of the rear wheels and the large turning diameter. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a schematic diagram of the structure of the steering gear assembly of the present invention;

[0029] Figure 2 It is a schematic diagram of the structure of the steering gear bracket of the present invention;

[0030] Figure 3 It is a schematic diagram of the structure of the steering gear bracket of the present invention;

[0031] Figure 4 It is a structural schematic diagram of the steering gear assembly and the steering gear bracket assembly of the present invention;

[0032] Figure 5 It is a structural schematic diagram of the steering gear assembly and the steering gear bracket assembly of the present invention;

[0033] Figure 6 It is a structural schematic diagram of the connection between the locking device of the present invention and the rear axle assembly;

[0034] Figure 7 It is a structural schematic diagram of the connection between the locking device of the present invention and the steering gear bracket;

[0035] Figure 8 is a schematic structural diagram of the locking device of the present invention;

[0036] Fig. 9 It is a schematic diagram of the overall structure of the rear axle steering system of the present invention.

[0037] In the figure: 1. Steering gear assembly; 11. Steering gear body; 111. Steering gear mounting hole; 12. Motor device; 13. Steering drop arm; 131. Steering drop arm locking nut; 14. Steering gear fixing bolt; 15. Steering gear tie rod; 2. Steering gear bracket; 21. First section; 21A. Lower fixing surface; 21B. Upper fixing surface; 21C. Leaf spring positioning surface; 211. Bracket fixing hole; 212. First leaf spring positioning hole; 213. Leaf spring bolt passing hole; 22. Third section; 23. Second section; 231. Steering gear mounting column; 2311. Steering gear mounting column connecting rib; 232. Steering gear output shaft passing hole; 233. Spare auxiliary bracket mounting hole; 24. First connecting transition surface; 25. Second connecting transition surface; 26. Front vertical plane; 261. first mounting hole; 262. swing opening; 27. rear vertical plane; 28. groove; 29. ​​steering gear bracket fixing bolt; 3. rear axle assembly; 31. I-beam; 311. plate support surface; 3111. steering gear bracket mounting hole; 3112. leaf spring fixing hole; 3113. second leaf spring positioning hole; 312. recessed curved section; 32A. left steering knuckle; 32B. right steering knuckle; 33. left lower joint arm; 34. right lower joint arm; 35. tie rod joint arm section; 36. tie rod assembly; 361. tie rod; 362. ball head assembly; 37. left wheel end assembly; 38. right wheel end assembly; 4. rear suspension assembly; 41. suspension fixing bolt group; 5. locking device; 51. locking tongue; 52. locking bracket; 53. air chamber assembly; 54. locking pin DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings 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 making creative work are within the scope of protection of this application.

[0039] The embodiments of the present application provide a rear-axle steering system and a vehicle with active steering and self-centering functions to solve the problem in the related art that the rear wheels of vehicles with rear-axle steering systems wear abnormally fast and do not have active steering and self-centering functions.

[0040] See also Figure 1-Figure 9 , a rear axle steering system with active steering and return functions, comprising a steering gear assembly 1, a steering gear bracket 2 and a rear axle assembly 3;

[0041] Among them, the rear axle assembly 3 includes an I-beam 31, and the I-beam 31 has a recessed curved section 312; the steering gear bracket 2 is arranged in parallel above the rear axle assembly 3, and a groove 28 is formed at its bottom; when the steering gear bracket 2 is installed on the rear axle assembly 3, the groove 28 and the recessed curved section 312 form a swinging space for the vertical arm arrangement; the steering gear assembly 1 includes a driving device arranged on the steering gear bracket 2, and the driving device is transmission-connected to a steering vertical arm device; the steering vertical arm device is located in the swinging space for the vertical arm arrangement, and is connected to a steering gear tie rod 15.

[0042] By utilizing the I-beam 31 of the axle, an installation position for the steering gear bracket 2 is provided, and the steering gear bracket 2 has a groove 28, which cooperates with the recessed curved section 312 of the I-beam 31 to form a swinging space for the vertical arm arrangement, so that the steering vertical arm can be connected to the steering gear tie rod 15; in addition, the steering gear bracket 2 provides an installation position for the steering gear assembly 1; so that when in use, the driving device of the steering gear assembly 1 drives the steering knuckle connected to the steering gear tie rod 15 to achieve steering and return functions; thereby providing a new axle, suspension, and steering assembly method, the layout structure of the steering gear is not affected by the traditional frame, and is completely separated from the thinking mode of fixing the steering gear on the frame. The steering gear is fixed on the axle, and the connection between the steering gear and the axle is not affected by the deformation of the suspension, so it is easy to control the steering, and the relative steering angle is accurate; the existing axle structure is utilized to meet the design requirements, the axle is slightly modified, and the vehicle manufacturing cost is controlled.

[0043] It can be used on the rear steering axle of 6x2R models. It has a great effect on improving the rapid wear of the rear wheels and the large turning diameter. The reason is that: since it can steer and the steering system is set on the axle, the rear wheels will not interfere with the steering mechanism to cause friction during turning.

[0044] refer to Figure 6-Figure 9 In some preferred embodiments, since the locking device 5 is required to realize the steering and the return, and other structures are described, the setting of the locking device 5 is described below, and the specific structure is as follows:

[0045] First, the locking device 5 is installed on the steering gear bracket 2.

[0046] The rear steering axle also includes a locking device 5;

[0047] The rear axle assembly 3 further includes a left steering knuckle 32A, a right steering knuckle 32B, a left lower arm 33, a right lower arm 34, a tie rod assembly 36, a left wheel end assembly 37, a right wheel end assembly 38, a rear suspension assembly 4 and a suspension fixing bolt group 41.

[0048] The left lower arm 33 and the right lower arm 34 are arranged at the two ends in the length direction of the I-beam 31; a part of the left lower arm 33 or the right lower arm 34 forms a tie rod arm section 35, and the end of the steering gear tie rod 15 away from the steering vertical arm device is connected to the tie rod arm section 35; the tie rod assembly 36 includes a tie rod 361, and the two ends of the tie rod 361 are connected to the left lower arm 33 and the right lower arm 34 through a ball head assembly 362; the locking device 5 is used to lock or release the tie rod 361.

[0049] Among them, the tie rod arm section 35 is integrated with the left lower arm 33 or the right lower arm 34, and the structure is simplified; and the left wheel end assembly 37, the right wheel end assembly 38, the rear suspension assembly 4 and the suspension fixing bolt group 41 are structures in the related technology, and the specific positional relationship is not described.

[0050] The second type is that the locking device 5 is installed on the I-beam 31; a second mounting hole is provided on the portion of the I-beam 31 where the concave curved section is provided, and the locking device 5 is installed on the I-beam 31 through the second mounting hole.

[0051] Regardless of the first or second type, refer to Figure 8 The locking device 5 includes a locking tongue 51, a locking bracket 52, an air chamber assembly 53 and a locking pin 54;

[0052] An air chamber assembly 53 is provided on the locking bracket 52, and a locking pin 54 is installed at the bottom of the air chamber assembly 53. The air chamber assembly 53 is used to push the locking pin 54 to move downward; one end of the locking tongue 51 is fixedly connected to the tie rod 361; the other end of the locking tongue 51 is used to extend into the locking bracket 52, and the other end of the locking tongue 51 is provided with a slot that is engaged with the locking pin 54. The locking pin 54 is assembled at the bottom of the air chamber assembly 53, and the air chamber assembly 53 is used to push the locking pin 54 to move downward, and is stuck on the locking tongue 51 to prevent the tie rod 361 from moving left and right, thus locking it and preventing it from turning. The locked state is mainly used when the vehicle is running at high speed. When the vehicle is turning at low speed, and the sanitation vehicle is working to collect garbage, the axle is in a non-locked state, and the rear axle actively turns.

[0053] refer to Figure 2-Figure 5 , the structure of the steering gear bracket 2 is described as follows:

[0054] The steering gear bracket 2 includes a first section 21, a second section 23 and a third section 22; the first section 21 and the third section 22 are located on both sides of the second section 23, are located in the same plane, and are also symmetrically arranged; the second section 23 is raised, and a groove 28 is formed at its bottom;

[0055] A front vertical plane 26 and a rear vertical plane 27 are provided on the second section 23 and on the side in the length direction of the vehicle, and a first mounting hole 261 for connecting with the locking device 5 and a swinging opening 262 for avoiding the output end of the steering drop arm device and the steering gear tie rod 15 are provided on the front vertical plane 26, and the swinging opening 262 is communicated with the groove 28. The swinging opening 262 is a reserved space for the steering drop arm device and the steering gear tie rod 15 to pass through.

[0056] A first connection transition surface 24 is provided at the connection between the first section 21 and the second section 23 ; a second connection transition surface 25 is provided at the connection between the third section 22 and the second section 23 , and the top and bottom of the first connection transition surface 24 and the second connection transition surface 25 have a designed height difference in the vertical direction.

[0057] The steering gear mounting base is located at the top of the second section 23, and two groups of steering gear mounting columns 231 are arranged on the steering gear mounting base, and steering gear mounting column connecting ribs 2311 are arranged between the steering gear mounting columns 231; the steering gear output shaft through hole 232 is located between the two groups of steering gear mounting columns 231; spare auxiliary bracket mounting holes 233 are arranged on both sides of the two groups of steering gear mounting columns 231. The height of the steering gear mounting base relative to the fixed end surface of the first section 21 and the third section 22, that is, the designed height difference can be adjusted according to the length of the steering gear output shaft and the drop of the vertical arm; the steering vertical arm can be set as a structure with a drop, and the height of the ball pin at the small end of the vertical arm is preferably equivalent to the height of the ball pin of the front axle steering knuckle arm, and the height difference is controlled within 20mm.

[0058] The spare auxiliary bracket mounting hole 233 is a threaded hole, which is convenient for assembling the auxiliary bracket, and is mainly used to fix the steering pipeline, the axle air chamber air circuit, etc. The height and layout structure of the steering gear mounting column 231 can be optimized according to the structure of the steering gear, and can be 4 or more. The steering gear can be arranged at the center of the second section 23, or on the left or right side, and the Y-direction inclination angle of the steering gear body 11 can be adjusted according to the layout requirements.

[0059] The bottom of the first section 21 includes a lower fixing surface 21A, and the top includes an upper fixing surface 21B and a leaf spring positioning surface 21C; the leaf spring positioning surface 21C is provided with a first leaf spring positioning hole 212, and the upper fixing surface 21B includes a bracket fixing hole 211 and a leaf spring bolt through hole 213. The leaf spring positioning surface 21C is a plane or an inclined surface with a designed inclination angle, and it can be understood that the leaf spring positioning surface 21C can be designed with a certain height / designed with a certain initial angle according to the height / angle of the suspension leaf spring arrangement; the leaf spring positioning surface is used to assemble the suspension leaf spring; the leaf spring positioning surface 21C plays a role in adjusting the height of the axle.

[0060] refer to Figure 6 and Figure 7 , the structure of the I-beam 31 is described as follows:

[0061] The I-beam 31 is provided with two plate support surfaces 311 correspondingly connected to the first section 21 and the third section 22, and the concave curved section 312 is located between the two plate support surfaces 311; the plate support surface 311 is provided with a steering gear bracket mounting hole 3111, a leaf spring fixing hole 3112 and a second leaf spring positioning hole 3113; the portion of the I-beam 31 provided with the concave curved section is provided with a second mounting hole for mounting the locking device 5. The structure of the I-beam 31 is arranged in correspondence with the steering gear bracket 2, and the combination of the steering gear bracket 2 and the I-beam 31 is suitable for axles of I-beam structure, and can also be used for axles of other structures, and is fixed by the plate support mounting surface.

[0062] refer to Figure 1 , Figure 4 and Figure 5 The driving device of the steering gear assembly 1 is installed on the steering gear mounting base through the above two groups of steering gear mounting columns 231 and the steering gear mounting column connecting ribs 2311, and the output shaft of the driving device passes through the steering gear output shaft through hole 232 and is connected to the steering drop arm device.

[0063] The driving device includes a steering gear body 11, a steering gear mounting hole 111, a motor device 12 and a steering gear fixing bolt 14;

[0064] A motor device 12 is arranged at the input shaft end of the steering gear body 11, and the output shaft on the steering gear body 11 is used to connect the steering drop arm device; the motor device 12 is provided with an electronic control component, and the electronic control component is used to control the rotation angle of the input shaft of the steering gear body 11 to control the steering drop arm device, and the electronic control component receives external instructions to work; the steering gear body 11 is connected to the steering gear bracket 2 through the steering gear mounting hole 111 and the steering gear fixing bolt 14; the steering drop arm device includes a steering drop arm 13, one end of the steering drop arm 13 is connected to the output shaft on the steering gear body 11 through the steering drop arm locking nut 131, and the other end of the steering drop arm 13 extends out of the drop arm arrangement swing space and is connected to the steering gear tie rod 15.

[0065] The steps during installation are:

[0066] ① Assemble the steering gear body 11 on the steering gear bracket 2, and pass the output shaft of the steering gear through the steering gear output shaft through hole 232 of the bracket and fix it.

[0067] ② Assemble the steering arm 13 on the output shaft of the steering gear. After the large end mark of the steering arm 13 is aligned with the mark of the steering gear output shaft, fix the steering arm 13 with the steering arm locking nut 131.

[0068] ③ Assemble the steering gear bracket 2 and the steering gear assembly 1 on the plate support surface of the axle, that is, the I-beam 31. The bottom of the first section 21 includes the lower fixing surface 21A in contact with the plate support surface 311. Use the steering gear bracket fixing bolt 29 to pass through the bracket fixing hole 211 to connect the steering gear bracket 2 and the I-beam 31 to form a bracket structure. Connect the steering drop arm and the steering gear tie rod 15;

[0069] The locking device 5 is installed on the front vertical plane 26; then the locking device 5 is connected to the tie rod 361; the steering gear tie rod 15 is connected to the tie rod knuckle section 35; then the left steering knuckle 32A, the right steering knuckle 32B, the left lower knuckle 33, the right lower knuckle 34, the tie rod assembly 36, the left wheel end assembly 37, the right wheel end assembly 38, the rear suspension assembly 4 and the suspension fixing bolt group 41 are installed.

[0070] ④Assemble the suspension and axle on the frame.

[0071] The working process is:

[0072] The motor device 12 on the steering gear assembly 1 receives the steering signal from the vehicle, drives the output shaft of the steering gear body 11 to rotate, thereby driving the steering vertical arm 13 to swing left or right, and the steering vertical arm 13 drives the tie rod knuckle arm to rotate around the kingpin of the axle through the steering gear tie rod 15, and the tie rod knuckle arm drives the left and right steering knuckles, lower knuckle arms, and horizontal tie rod assemblies, and finally realizes the steering of the wheels. Under the control of the motor device 12, it plays an active steering and self-centering role, which is conducive to accurately controlling the steering amplitude.

[0073] When the vehicle sends the steering system to the motor device 12, the above actions are executed. When there is no steering demand and the tires need to return to the original straight-line driving state, referring to the above actions, the output shaft of the steering machine body 11 rotates back to the initial zero position state, driving the drop arm, pull rod, and wheel to return to the initial zero position state.

[0074] The present application also includes a vehicle, the vehicle including the rear axle steering system with active steering and self-centering functions and the front axle steering system with active steering and self-centering functions as described above. The vehicle includes the rear axle steering system with active steering or self-centering functions and the front axle steering system with active steering and self-centering functions as described above.

[0075] They all have a steering gear assembly 1 and a prone-arranged steering gear support structure;

[0076] The prone-arranged steering gear support structure includes: a steering gear support 2 and a rear axle assembly 3; wherein the rear axle assembly 3 includes an I-beam 31, and the I-beam 31 has a recessed curved section 312; the steering gear support 2 is arranged in parallel above the rear axle assembly 3, and a groove 28 is formed at its bottom; when the steering gear support 2 is installed on the rear axle assembly 3, the groove 28 and the recessed curved section 312 form a swinging space for a drop arm arrangement; the steering gear assembly 1 includes a driving device arranged on the steering gear support 2, and the driving device is transmission-connected to a steering drop arm device; the steering drop arm device is located in the swinging space for the drop arm arrangement, and is connected to a steering gear tie rod 15.

[0077] How this application works:

[0078] (1) By utilizing the I-beam 31 of the axle, an installation position for the steering gear bracket 2 is provided, and the steering gear bracket 2 has a groove 28, which cooperates with the recessed curved section 312 of the I-beam 31 to form a swinging space for the vertical arm arrangement, so that the steering vertical arm can be connected to the steering gear tie rod 15; in addition, the steering gear bracket 2 provides an installation position for the steering gear assembly 1; therefore, when in use, the driving device of the steering gear assembly 1 drives the steering knuckle connected to the steering gear tie rod 15 to achieve steering and return functions; thereby providing a new axle, suspension, and steering assembly method, the layout structure of the steering gear is not affected by the traditional frame, and is completely separated from the thinking mode of fixing the steering gear on the frame. The steering gear is fixed on the axle, and the connection between the steering gear and the axle is not affected by the deformation of the suspension, so it is easy to control the steering, and the relative steering angle is accurate; the existing axle structure is utilized to meet the design requirements, the axle is slightly modified, and the vehicle manufacturing cost is controlled.

[0079] (2) The steering gear bracket 2 includes a first section 21, a second section 23 and a third section 22; the first section 21 and the third section 22 are located on both sides of the second section 23, are located in the same plane, and are also symmetrically arranged; the second section 23 is raised, and a groove 28 is formed at its bottom; the second section 23 is provided with a front vertical plane 26 and a rear vertical plane 27 on the side located in the length direction of the vehicle, and the front vertical plane 26 is provided with a first mounting hole 261 for connecting with the locking device 5, and a swinging opening 262 for avoiding the output end of the steering drop arm device and the steering gear tie rod 15, and the swinging opening 262 is connected to the groove 28. The swinging opening 262 is for the steering drop arm device and the steering gear tie rod 15 to pass through, and the groove 28 is a reserved space; the above structure not only provides a reserved space for the steering drop arm device and the steering gear tie rod 15, but also provides a mounting point for the locking device 5.

[0080] (3) The locking device 5 can be arranged on the steering gear bracket 2 or installed on the I-beam 31, so that the locking device 5 has multiple installation spaces and the equipment installation is more flexible.

[0081] (4) The three-section structure of the steering gear bracket 2 matches the structure of the I-beam 31, requiring only minor changes to the axle, and can be retrofitted on existing axles, thus reducing costs.

[0082] (5) The bottom of the first section 21 includes a lower fixing surface 21A, and the top includes an upper fixing surface 21B and a leaf spring positioning surface 21C; the leaf spring positioning surface 21C is provided with a first leaf spring positioning hole 212, and the upper fixing surface 21B includes a bracket fixing hole 211 and a leaf spring bolt through hole 213. This arrangement makes the connection with the I-beam 31 and the connection with the leaf spring reasonably distinguishable, and does not interfere with each other during connection, and the structure is compact.

[0083] In the description of the present application, it should be noted that the terms "upper", "lower", etc. 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 application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0084] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0085] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0086] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0087] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps of the functions specified in the box or multiple boxes. In a typical configuration, the computing device includes one or more processors (CPU), input / output interfaces, network interfaces and memory. The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0088] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also 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 a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0089] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A rear axle steering system with active steering and self-centering functions, characterized in that: It includes: A rear axle assembly (3) comprising an I-beam (31), wherein the I-beam (31) has a concave curved section (312); A steering gear bracket (2) is arranged parallel to the rear axle assembly (3), and a groove (28) is formed at the bottom thereof; when the steering gear bracket (2) is installed on the rear axle assembly (3), the groove (28) and the concave curved section (312) form a swing space for the vertical arm arrangement; The steering gear assembly (1) comprises a driving device arranged on the steering gear bracket (2), the driving device being transmission-connected to a steering drop arm device; the steering drop arm device is located in a drop arm arrangement swing space and is connected to a steering gear tie rod (15).

2. The rear axle steering system with active steering and return functions as claimed in claim 1, characterized in that: The rear steering axle also includes a locking device (5); The rear axle assembly (3) further comprises a left steering knuckle (32A), a right steering knuckle (32B), a left lower knuckle arm (33), a right lower knuckle arm (34) and a tie rod assembly (36); The left lower arm (33) and the right lower arm (34) are arranged at two ends of the I-beam (31) in the length direction; a part of the left lower arm (33) or the right lower arm (34) forms a tie rod arm section (35), and one end of the steering gear tie rod (15) away from the steering drop arm device is connected to the tie rod arm section (35); The tie rod assembly (36) comprises a tie rod (361), and two ends of the tie rod (361) are connected to a left lower arm (33) and a right lower arm (34) via a ball head assembly (362); the locking device (5) is used to lock or release the tie rod (361).

3. The rear axle steering system with active steering and return functions as claimed in claim 2, characterized in that: A front vertical plane (26) is provided on the steering gear bracket (2) and on the side surface in the length direction of the vehicle, and a first mounting hole (261) and a swing opening (262) for avoiding the output end of the steering drop arm device and the steering gear tie rod (15) are provided on the front vertical plane (26), and the swing opening (262) is communicated with the groove (28); The locking device (5) is mounted on the steering gear bracket (2) through the first mounting hole (261).

4. The rear axle steering system with active steering and return functions as claimed in claim 3, characterized in that: The steering gear bracket (2) comprises a first section (21), a second section (23) and a third section (22); the first section (21) and the third section (22) are located on both sides of the second section (23) and are located in the same plane; the second section (23) is raised, and the groove (28) is formed at its bottom, and the front vertical plane (26) is located on the second section (23).

5. The rear axle steering system with active steering and return functions as claimed in claim 4, characterized in that: The I-beam (31) is provided with two plate supporting surfaces (311) correspondingly connected to the first section (21) and the third section (22), and the concave curved section (312) is located between the two plate supporting surfaces (311).

6. The rear axle steering system with active steering and return functions as claimed in claim 2, characterized in that: A second mounting hole is provided on the portion of the I-beam (31) where the concave curved section is provided, and the locking device (5) is installed on the I-beam (31) through the second mounting hole.

7. The rear axle steering system with active steering and self-centering functions according to any one of claims 2, 3 or 6, characterized in that: The locking device (5) comprises a locking tongue (51), a locking bracket (52), an air chamber assembly (53) and a locking pin (54); An air chamber assembly (53) is arranged on the locking bracket (52), a locking pin (54) is mounted at the bottom of the air chamber assembly (53), and the air chamber assembly (53) is used to push the locking pin (54) to move downward; one end of the locking tongue (51) is fixedly connected to the horizontal tie rod (361); the other end of the locking tongue (51) is used to extend into the locking bracket (52), and a slot for engaging with the locking pin (54) is arranged on the other end of the locking tongue (51).

8. The rear axle steering system with active steering and return functions as claimed in claim 1, characterized in that: The driving device comprises a steering gear body (11), a steering gear mounting hole (111), a motor device (12) and a steering gear fixing bolt (14); The input shaft end of the steering gear body (11) is provided with a motor device (12), and the output shaft on the steering gear body (11) is used to connect the steering drop arm device; the motor device (12) is provided with an electric control component, and the electric control component is used to control the rotation angle of the input shaft of the steering gear body (11) to control the steering drop arm device; The steering gear body (11) is connected to the steering gear bracket (2) via a steering gear mounting hole (111) and a steering gear fixing bolt (14).

9. The rear axle steering system with active steering and return functions as claimed in claim 8, characterized in that: The steering drop arm device comprises a steering drop arm (13), one end of the steering drop arm (13) is connected to an output shaft on a steering gear body (11) via a steering drop arm locking nut (131), and the other end of the steering drop arm (13) extends out of the drop arm arrangement swing space and is connected to a steering gear tie rod (15).

10. A vehicle, characterized in that: It includes: A rear axle steering system with active steering and return functions as claimed in any one of claims 1 to 9.

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