Universal positioning tool for rear wheel steering machine

Abstract

The present application relates to positioning tool technical field, disclose a kind of rear wheel steering machine general positioning tool, including bottom plate and two groups of independently arranged tool assembly;The bottom plate is provided with long slot extending along length direction, each tool assembly contains base, connecting arm, positioning arm, bottom plate fastening component and positioning column, base is slidably locked on long slot by bottom plate fastening component, to adjust the lateral spacing of two tool assemblies;Connecting arm both ends are respectively hinged base and positioning arm, positioning column is positioned on positioning arm for with steering machine positioning hole cooperation;Switching mechanism is arranged at the hinge, can be switched between anti-rotation type quick positioning state and stepless adjustment state, and the axial height of hinge can be adjusted.The present application can be widely adapted to a variety of specifications rear wheel steering machine, with quick change efficiency and fine adjustment ability, positioning stiffness and high repeat accuracy, effectively reduce the amount of special tool, reduce manufacturing cost and management cost.

Description

Technical Field

[0001] This invention relates to the field of positioning tooling technology, specifically a universal positioning tooling for rear wheel steering systems. Background Technology

[0002] With the continuous advancement of automotive manufacturing technology, higher demands are being placed on the assembly precision and production efficiency of automotive parts. As a core component of the automotive steering system, the assembly quality of the rear-wheel steering gear directly affects the handling and safety of the entire vehicle. During the production process, the rear-wheel steering gear needs to be precisely fixed on specific positioning fixtures for subsequent assembly, debugging, and testing processes.

[0003] Traditional positioning tooling typically employs a "one-to-one" dedicated design approach, meaning a specific set of tooling needs to be designed and manufactured for each model of rear-wheel steering gear. Under this model, when product models change or new products are introduced, new tooling must be redesigned and manufactured, resulting in long production preparation cycles and high costs. Furthermore, the storage and management of a large number of dedicated tooling units consumes valuable workshop space and increases operational burden. Most existing dedicated tooling units have fixed structures and cannot adapt to rear-wheel steering gears with different housing lengths and mounting hole positions, severely restricting the improvement of automotive parts manufacturers' flexibility, multi-variety, and small-batch production capabilities.

[0004] To address these issues, some existing technologies attempt to improve tooling versatility by adding adjustable mechanisms, such as using screw grooves with nuts or sliding grooves to move positioning points. However, these improvements often focus on unilateral adjustment or overall frame adjustment. For rear-wheel steering gears requiring dual-sided coordinated positioning, their adjustment flexibility is insufficient, making it difficult to simultaneously accommodate large variations in lateral spacing and longitudinal length. Especially when dealing with rear-wheel steering gear housings of different specifications, it is often still necessary to replace some core positioning components, failing to fundamentally overcome the limitations of dedicated tooling. This results in persistently low changeover efficiency, failing to fully meet the demands of modern lean manufacturing for rapid changeover and low-cost operation.

[0005] Therefore, there is an urgent need to develop a new type of rear-wheel steering gear positioning fixture. This fixture should possess high versatility and flexibility, enabling it to quickly adapt to various rear-wheel steering gears of different specifications through simple mechanical adjustments without changing the main structure. Simultaneously, it should be characterized by low manufacturing cost and ease of maintenance, solving the problems of large quantities, slow changeover, and high warehousing management costs associated with traditional fixtures. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a universal positioning fixture for rear wheel steering gear, which solves the problems of poor universality, low changeover efficiency, and high manufacturing and management costs of traditional special fixtures, while ensuring positioning accuracy and structural rigidity, and meeting the flexible production needs of multiple varieties and small batches.

[0007] The present invention is achieved through the following technical solution.

[0008] The present invention provides a universal positioning fixture for a rear wheel steering gear, comprising a base plate and two independently configured fixture assemblies;

[0009] The base plate is provided with a long groove extending along the length direction;

[0010] Each tooling assembly includes a base, a connecting arm, a positioning arm, a base plate fastening assembly, and a positioning post;

[0011] The base is slidably locked and fixed to the long slot by the base plate fastening assembly to adjust the lateral spacing between the two tooling assemblies;

[0012] It adopts a dual-side split modular tooling assembly design, which, together with the long groove of the base plate, can realize a wide range of continuous adjustment of the lateral spacing between the two sets of tooling assemblies, and can quickly accommodate various length specifications of rear wheel steering gears from compact to extended types;

[0013] One end of the connecting arm is hinged to the base, and the other end of the connecting arm is hinged to one end of the positioning arm. The positioning pin is disposed on the positioning arm and is used to cooperate with the positioning hole of the rear wheel steering gear for positioning.

[0014] The articulated connecting arm and the positioning arm form a multi-degree-of-freedom follow-up adjustment structure, which can drive the positioning column to achieve multi-dimensional micro-motion adjustment in the plane. There is no need to modify the tooling body structure. The steering gear with different positioning references can be adapted simply by changing the angle of the arm.

[0015] A switching mechanism is provided at the hinge between the connecting arm and the base, and / or at the hinge between the connecting arm and the positioning arm. The switching mechanism is used to switch between an anti-rotation rapid positioning state and a stepless adjustment state. In the anti-rotation rapid positioning state, the axial height of the hinge can be adjusted.

[0016] The switching mechanism includes an end face gear plate, a tooth groove, a connecting rod fastening bolt, a fastening nut, a receiving groove, and a position adjustment structure;

[0017] The receiving groove is formed on one of the arms of the hinge pair, and the end face toothed disk is axially movable and accommodated in the receiving groove; the tooth groove is formed on the other arm of the hinge pair, and the tooth groove is adapted to the positioning teeth on the end face toothed disk.

[0018] The connecting rod fastening bolt is coaxially inserted through the central through hole of the end face gear plate and threadedly engaged with the fastening nut to lock the two hinged arms; the position adjustment structure is connected to the end face gear plate and is used to drive the end face gear plate to move axially.

[0019] The switching mechanism features dual working modes and height adjustment capabilities. In anti-rotation quick positioning mode, it achieves gear locking through end face gear meshing, enabling rapid model changeover for mature models. The rigid gear meshing also solves the problem of insufficient rigidity in the flexible adjustment structure, significantly improving repeatability. In stepless adjustment mode, it can break free from gear meshing limitations, enabling continuous and precise adjustment of the arm angle, adapting to steering gear models with non-standard gears. Simultaneously, the axial movement of the end face gear disc can adjust the overall height of the hinge, adapting to steering gears with different positioning hole heights, further expanding the applicability of the tooling and achieving full-dimensional flexible adaptation.

[0020] Furthermore, the switching mechanism has three operating states:

[0021] Anti-rotation quick positioning state: The positioning teeth of the end face toothed disc are engaged in the tooth groove, and the two hinged arms are circumferentially locked through tooth meshing;

[0022] Height adjustment state: The end face toothed disc is driven to extend axially through the position adjustment structure to raise the height of the corresponding arm body, thereby adjusting the vertical height of the positioning column;

[0023] Infinitely adjustable state: The end face toothed disc is housed in the receiving groove and disengaged from the tooth groove, and the two hinged arms are in end face friction engagement, allowing for stepless circumferential rotation to adjust the angle.

[0024] Furthermore, the base plate is provided with several long slots arranged along the width direction, and the two sets of tooling assemblies can be set in the same long slot or in different long slots; the setting of multiple rows of parallel long slots provides the tooling assembly with a position adjustment dimension in the width direction. The two sets of tooling assemblies can be selected to be installed in the same long slot or in different long slots according to the width direction offset of the steering gear positioning hole, which further improves the spatial adaptability of the positioning point, can be compatible with various steering gear structures with lateral misalignment of positioning holes, and expands the applicable scenarios of the tooling.

[0025] Furthermore, the position adjustment structure includes a screw and a slider; the slider is slidably installed in the slide groove of the arm body and fixedly connected to the end face gear plate; the screw is threadedly engaged with the slider, and rotating the screw can drive the end face gear plate to rise and fall axially; the screw-slider transmission structure has the characteristics of smooth transmission and high adjustment accuracy. The axial displacement of the end face gear plate can be precisely controlled by rotating the screw, and the operation is simple and easy to learn; at the same time, the threaded transmission has a self-locking characteristic, which can stably maintain the axial position of the end face gear plate after adjustment, avoid gear plate displacement during operation, and ensure the reliability and stability of switching between the two working states.

[0026] Furthermore, a limit body is provided on the rod body of the connecting rod fastening bolt to prevent the connecting rod fastening bolt from disengaging from the arm body. This prevents the bolt from completely disengaging from the arm body and causing parts to scatter and be lost when the bolt is loosened for angle adjustment. This simplifies the operation steps for changing and adjusting the model, and improves the convenience of tooling use and the efficiency of daily maintenance.

[0027] Furthermore, the long groove is a T-shaped long groove, and the base plate fastening assembly includes a base plate fastening bolt and a nut inside the groove. The nut inside the groove can move within the T-shaped long groove, and both sides of the base are provided with mating grooves for the base plate fastening bolt to pass through. The structure of the T-shaped long groove and the nut inside the groove can not only achieve smooth sliding adjustment of the base along the groove, but also provide reliable clamping force when the bolt is tightened, ensuring the structural rigidity and anti-lateral displacement capability of the base installation. The design of the mating grooves on both sides of the base allows the base position adjustment and disassembly to be carried out without completely disassembling the fastening bolts. Simply loosening the bolts is sufficient for sliding adjustment, effectively improving the operational efficiency of spacing adjustment.

[0028] Furthermore, the positioning post is a cylindrical stepped shaft with a positioning cone surface at the top. The positioning post with the stepped shaft structure can provide stable support for the steering gear housing through the shoulder step surface and bear the weight of the steering gear. The positioning cone surface at the top has a guiding function, which can reduce the difficulty of aligning the positioning post with the steering gear positioning hole, improve the efficiency of loading and unloading assembly, and at the same time ensure the coaxiality accuracy of the positioning fit and reduce assembly errors.

[0029] Furthermore, the outer surface of the positioning post is provided with at least one protruding rubber strip for abutting against the inner wall of the steering gear positioning hole; the rubber strip can fill the fitting gap between the positioning post and the positioning hole through its own elastic deformation, eliminating radial movement and improving positioning stability; at the same time, the rubber strip is made of flexible material, which can avoid direct hard contact between the metal positioning post and the positioning hole of the steering gear housing, prevent scratches, indentations and other defects on the workpiece surface, and protect the product appearance and processing quality.

[0030] Furthermore, a stud is provided at the bottom of the positioning column, and a threaded hole is provided on the positioning arm for the stud to be screwed in; the detachable threaded connection allows the positioning column to be quickly replaced with a positioning column of the corresponding size according to the hole diameter of the steering gear positioning hole, without the need to replace the positioning arm or other parts, further improving the versatility of the tooling; at the same time, the disassembly and assembly operation is simple, which facilitates the replacement and maintenance of the positioning column after wear, and reduces the tooling maintenance cost.

[0031] Furthermore, the positioning arm is provided with a ball joint seat, and the bottom of the positioning column is provided with a ball head that mates with the ball joint seat; a ball head fastening bolt is installed on the ball joint seat to abut and fix the ball head, so as to adjust the tilt angle of the positioning column; the ball joint hinge structure gives the positioning column the ability to adjust the tilt angle of the entire angle, which can adjust the angle of the positioning column for non-perpendicular positioning holes of different steering gears, ensuring complete fit between the positioning column and the positioning hole, further improving the tooling's adaptability to steering gears with irregular holes and oblique holes, and enhancing the reliability and fit of positioning.

[0032] Furthermore, the base is made of steel; the connecting arm and the positioning arm are made of aluminum alloy; and the positioning column is made of mold steel.

[0033] The beneficial effects of this invention are:

[0034] Wide range of specifications and high flexibility: Adopting a dual-side split modular design, the two sets of tooling assemblies can freely adjust the lateral spacing along the T-shaped long groove of the base plate, which can quickly accommodate various specifications of rear wheel steering gears from compact to extended types, significantly reducing the amount of tooling and the number of changes, and greatly improving the flexible production capacity of the production line.

[0035] It boasts strong fine-tuning capabilities and high reusability: Through a follow-up adjustment structure composed of an articulated connecting arm and a positioning arm, the positioning column can achieve multi-dimensional micro-adjustment; without changing the tooling body structure, it can adapt to the positioning reference changes of new products simply through mechanical displacement. When developing a new steering gear, there is no need to remake the main tooling body; only minor point adjustments are required for continued use, effectively reducing manufacturing and maintenance costs and minimizing material and manpower waste.

[0036] Multi-mode switching, balancing efficiency and versatility: The switching mechanism integrates three working states: anti-rotation quick positioning state, which uses gear meshing and locking to achieve quick model changeover, while solving the problem of stiffness degradation caused by flexible adjustment and greatly improving repeatability; stepless adjustment state, which can finely adapt to non-standard gear steering gears; and height adjustment state, which can adapt to positioning holes of different heights, further expanding the applicability of tooling.

[0037] Stable and reliable positioning with high assembly accuracy: The dual-sided split tooling assembly achieves wide specification coverage while ensuring the consistency of assembly datum, reducing assembly errors and scrap rate; the convex rubber strip structure of the positioning post can eliminate radial clearance and prevent workpiece scratches; the ball-head positioning post can adapt to different hole inclination angles, further improving positioning fit and stability. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 A schematic diagram of the overall structure of a universal positioning fixture for rear wheel steering systems;

[0040] Figure 2 This is a structural schematic diagram of the tooling assembly;

[0041] Figure 3 This is a schematic diagram of the tooling assembly after it is fitted with the rear wheel steering gear.

[0042] Figure 4 This is a schematic diagram of the contact side of the connecting arm and the positioning arm.

[0043] Figure 5 This is a schematic diagram of the top surface (left) and bottom surface (right) of the gear disc;

[0044] Figure 6 This is a schematic diagram of the switching mechanism;

[0045] Figure 7 A schematic diagram showing the switching mechanism in different states;

[0046] Markings in the diagram: 1-Base plate; 11-T-shaped long groove; 2-Tooling assembly; 21-Base; 211-Matching groove; 22-Connecting arm; 23-Positioning arm; 24-Base plate fastening bolt; 25-Nut in groove; 26-Ball head fastening bolt; 27-Positioning column; 271-Convex rubber strip; 28-Ball head seat; 29-Switching mechanism; 291-End face gear plate; 2911-Positioning tooth; 292-Slider; 293-Connecting rod fastening bolt; 2931-Limiting body; 294-Fasting nut; 295-Screw; 296-Gear groove; 297-Receiving groove; 3-Rear wheel steering gear; 31-Positioning hole. Detailed Implementation

[0047] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0048] Example 1:

[0049] like Figures 1 to 7 As shown in the figure, this embodiment discloses a universal positioning fixture for a rear wheel steering gear, including a base plate 1 and two sets of fixture assemblies 2.

[0050] The base plate 1 is a rectangular metal platform used to support the tooling assembly 2. Several T-shaped long slots 11 with both ends through are provided on the base plate 1.

[0051] Each tooling assembly 2 includes a base 21, a connecting arm 22, a positioning arm 23, a base plate fastening bolt 24, a groove nut 25, a mating groove 211, and a positioning post 27.

[0052] The base 21 is made of rectangular metal, preferably 45# steel, providing sufficient support rigidity. Both sides of the base 21 have mating grooves 211, which are U-shaped grooves for the base plate fastening bolts 24 to pass through. Nuts 25 inside the grooves engage with the base plate fastening bolts 24. The nuts 25 can move within the T-shaped long groove 11 for position adjustment. The base plate fastening bolts 24 pass through the mating grooves 211 from top to bottom and are threadedly connected to the nuts 25 within the grooves. When the base plate fastening bolts 24 are tightened, the base 21 is locked and fixed to the base plate 1; when the bolts are loosened, the base 21 can slide laterally along the T-shaped long groove 11 to adjust the distance between the two tooling assemblies 2 to accommodate rear wheel steering gears 3 of different lengths.

[0053] The connecting arm 22 and the positioning arm 23 are two connecting rods that together form an adjusting arm. The connecting arm 22 and the positioning arm 23 are preferably made of 7075 aluminum alloy. One end of the connecting arm 22 is hinged to the base 21, and the other end is hinged to the positioning arm 23.

[0054] The hinged connection structure can be selected from ordinary bolts and nuts, pins, or switching mechanism 29. When using ordinary bolts and nuts, the corresponding arm cannot rotate after tightening, but can be rotated and adjusted after loosening. When using the pin connection method, the two ends of the pin are riveted to achieve a tighter connection, which requires a larger torque to rotate, to avoid excessive flexibility that would cause the rear wheel steering gear to move easily after positioning; the switching mechanism 29 is preferred for connection.

[0055] The switching mechanism 29 includes a receiving groove 297, an end face gear plate 291, a toothed groove 296, a connecting rod fastening bolt 293, a fastening nut 294, and a position adjustment structure.

[0056] The connecting arm 22 and the positioning arm 23 are connected by a switching mechanism 29 and / or the connecting arm 22 and the base 21.

[0057] The following example uses the switching mechanism 29 between the connecting arm 22 and the positioning arm 23.

[0058] End face gear plate 291 Figure 4 , Figure 5 As shown, it is disc-shaped with several radiating positioning teeth 2911 on its end face. The end face toothed disc 291 and the position adjustment structure are installed on the positioning arm 23, and the end face toothed disc 291 is set in the receiving groove 297 and can move in the receiving groove 297. The position adjustment structure is connected to the end face toothed disc 291 and is used to adjust the position of the end face toothed disc 291 in the axial (height) direction. The end face toothed disc 291 has a through hole in the center for the connecting rod fastening bolt 293 to pass through, so that the end face toothed disc 291 and the connecting rod fastening bolt 293 are coaxially set. The fastening nut 294 is set at the connecting arm 22, through which the connecting rod fastening bolt 293 passes. The positioning arm 23 and the connecting arm 291 are connected. The fastening nut 294 of the connecting rod is connected, and a limit body 2931 is provided on the connecting rod fastening bolt 293. After the connecting rod fastening bolt 293 is loosened and disengaged from the fastening nut 294, the limit body 2931 is used to restrict the connecting rod fastening bolt 293 from disengaging from the connecting arm 22. The positioning arm 23 can rotate around the connecting rod fastening bolt 293 as an axis. The tooth groove 296 is provided on the connecting arm 22. The tooth groove 296 can be a slot opened on the connecting arm 22, or it can be a disc with a tooth groove installed on the connecting arm 22. The tooth groove 296 corresponds one-to-one with the positioning tooth 2911 on the end face tooth disc 291, and the depth of the tooth groove 296 is less than the height of the positioning tooth 2911.

[0059] The structure at end face toothed disc 291 and tooth groove 296 can be made of aluminum alloy or steel to ensure locking strength.

[0060] The position adjustment structure in this embodiment adopts a screw-type adjustment method, including a screw 295 and a slider 292 that is threadedly engaged with the screw 295. The screw 295 is rotatably mounted on the positioning arm 23, and the slider 292 is slidably mounted in the groove of the positioning arm 23 and threadedly engaged with the screw 295. The slider 292 is connected to the end face gear plate 291 through a connecting frame. The height of the end face gear plate 291 is adjusted by rotating the screw 295.

[0061] like Figure 7 The switching mechanism 29 has three working states. During adjustment, first loosen the connecting rod fastening bolt 293 (e.g., ...). Figure 7 (As shown in the image below), including:

[0062] Anti-rotation rapid positioning state ( Figure 7(Above figure): The specific mating angle between the end face gear plate 291 and the tooth groove 296 is adapted to a specific model of steering gear to achieve gear adjustment. To facilitate quick positioning, a scale can be set on the outer surface of the positioning arm 23 and / or the connecting arm 22. By rotating the positioning arm 23 relative to the connecting arm 22 to the corresponding angle (or rotating the connecting arm 22 relative to the base 21 to the corresponding angle), and making the positioning tooth 2911 engage with the tooth groove 296, a quick and accurate gear shift can be achieved. After completion, tighten the connecting rod fastening bolt 293 to fix the positioning arm 23 (or the connecting arm 22). Under the effect of locking of the end face meshing teeth, the mechanical rigid meshing solves the common drawback of "rigidity degradation caused by flexible adjustment", which greatly improves the repeatability accuracy.

[0063] Altitude adjustment status ( Figure 7 (Above figure): For steering gears with different height positioning holes, rotating the screw 295 lowers the end face gear 291, making the end face gear 291 protrude more from the bottom of the positioning arm 23 (or connecting arm 22), thereby increasing the height of the positioning arm 23 (or connecting arm 22) and achieving the effect of height adjustment. When the switching mechanism 29 is set between the connecting arm 22 and the positioning arm 23, and between the connecting arm 22 and the base 21, the height adjustment range is larger and can be applied to more models of steering gears.

[0064] Stepless adjustment state ( Figure 7 (Middle diagram): For steering gears that are not within the specific engagement angle range between the end face gear plate 291 and the tooth groove 296, the end face gear plate 291 is raised and retracted into the receiving groove 297 by rotating the screw 295. The end face gear plate 291 and the tooth groove 296 are disengaged, and the positioning arm 23 and the connecting arm 22 are in end face contact engagement, thereby finely adjusting the angle between the positioning arm 23 and the connecting arm 22 (or the angle between the connecting arm 22 and the base 21) to achieve stepless adjustment. After adjustment, tighten the connecting rod fastening bolt 293.

[0065] The switching mechanism 29 can quickly locate the corresponding model in different gears, and after positioning, it can lock and prevent rotation through gear meshing, improving positioning stability. It can also be switched to a stepless adjustment state, which allows for stepless fine adjustment and is suitable for positioning steering gears outside the gear range. For steering gears with different height positioning holes, the height of the positioning column 27 can be indirectly adjusted by adjusting the protruding length of the end face gear plate 291, further increasing the applicability.

[0066] The positioning column 27 is a cylindrical stepped shaft made of Cr12MoV mold steel with a hardness of HRC58 to 62 after quenching. Its top end is provided with a positioning cone surface for engaging with the positioning hole 31 on the rear wheel steering gear 3 housing. The step is used to support the steering gear housing.

[0067] The connection between the positioning post 27 and the positioning arm 23 is a threaded, detachable connection.

[0068] When a threaded detachable design is adopted, a stud is provided at the bottom of the positioning post 27, which can be screwed into the threaded hole on the positioning arm 23 to achieve a detachable connection.

[0069] The outer surface of the positioning post 27 is provided with one or more protruding rubber strips 271. When it is engaged with the positioning hole 31, the protruding rubber strips 271 press against the inner wall of the positioning hole 31, which can prevent scratching and radial movement, and ensure the stability of positioning.

[0070] Working principle: When it is necessary to position a specific model of rear wheel steering gear 3, firstly, according to the distance of the positioning holes 31 on both sides of the steering gear housing in the length direction, loosen the base plate fastening bolts 24 of the two sets of tooling assemblies 2, then move the base 21 along the T-shaped long groove 11 to adjust the relative distance between the two bases 21. After the adjustment is completed, tighten the base plate fastening bolts 24 and the nuts 25 in the groove to fix the position of the base 21, thus completing the large-range coarse adjustment of dimensions.

[0071] Subsequently, for the specific location of the positioning hole 31 of this type of steering gear, the connecting arm 22 and the positioning arm 23 on one side of the tooling assembly 2 are adjusted, causing the positioning pin 27 to move slightly, so that its top conical surface is precisely aligned with and inserted into the positioning hole 31 on one side of the steering gear housing. The other side of the tooling assembly 2 is operated in the same way, so that its positioning pin 27 is precisely aligned with and supports the positioning hole on the other side of the steering gear housing.

[0072] At this point, the steering gear is precisely supported and positioned by the positioning columns on both sides, allowing for subsequent assembly or processing procedures.

[0073] When a brand-new rear wheel steering gear is introduced into the production line, there is no need to redesign, manufacture and assemble a whole set of special tooling. Instead, based on the standardized base plate, the basic position can be roughly adjusted over a wide range using the T-shaped long groove 11, and then the positioning reference point can be finely adjusted by the standardized adjusting arm consisting of the connecting arm 22 and the positioning arm 23. This completes the entire model changeover.

[0074] This process enables flexible operation across the entire chain, from macroscopic dimensional adjustment to microscopic benchmark adaptation. It not only meets the urgent need for rapid changeover in multi-variety, small-batch production, but also ensures the consistency of assembly benchmarks through standardized positioning modules, effectively reducing the scrap rate. Due to the high degree of component commonality and the reusability of the main structure, the total amount of tooling required for the production line has been significantly reduced, significantly decreasing storage space occupation and related management and operating costs.

[0075] Example 2:

[0076] Unlike in Embodiment 1, in this embodiment, the connection between the positioning post 27 and the positioning arm 23 is an adjustable tilt connection.

[0077] When using an adjustable tilt connection, a ball joint seat 28 is provided on the positioning arm 23, and a ball head that mates with the ball joint seat 28 is provided at the bottom of the positioning column 27. A ball head fastening bolt 26 for pressing the ball head is installed on the ball joint seat 28. After adjustment, the position of the ball head is fixed by tightening the ball head fastening bolt 26, thereby realizing an adjustable tilt connection. This allows for adjustment of the tilt angle for different steering gear positioning holes, further increasing the applicability of this device.

[0078] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand and implement the present invention. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A universal positioning fixture for a rear wheel steering gear, characterized in that, Includes the base plate and two independently configured tooling assemblies; The base plate is provided with a long groove extending along the length direction; Each tooling assembly includes a base, a connecting arm, a positioning arm, a base plate fastening assembly, and a positioning post; The base is slidably locked and fixed to the long slot by the base plate fastening assembly to adjust the distance between the two tooling assemblies; One end of the connecting arm is hinged to the base, and the other end of the connecting arm is hinged to one end of the positioning arm. The positioning pin is disposed on the positioning arm and is used to cooperate with the positioning hole of the rear wheel steering gear for positioning. At least one of the hinges between the connecting arm and the base, and between the connecting arm and the positioning arm, is provided with a switching mechanism. The switching mechanism is used to switch between an anti-rotation rapid positioning state and a stepless adjustment state. In the anti-rotation rapid positioning state, the axial height of the hinge can be adjusted. The switching mechanism includes an end face gear plate, a tooth groove, a connecting rod fastening bolt, a fastening nut, a receiving groove, and a position adjustment structure; The receiving groove is formed on one of the arms of the hinge pair, and the end face toothed disk is axially movable and accommodated in the receiving groove; the tooth groove is formed on the other arm of the hinge pair, and the tooth groove is adapted to the positioning teeth on the end face toothed disk. The connecting rod fastening bolt is coaxially inserted through the central through hole of the end face gear plate and threadedly engaged with the fastening nut to lock the two hinged arms; the position adjustment structure is connected to the end face gear plate and is used to drive the end face gear plate to move axially.

2. The universal positioning fixture for rear wheel steering gear according to claim 1, characterized in that, The base plate is provided with several long slots arranged along the width direction, and the two sets of tooling assemblies can be set in the same long slot or in different long slots.

3. The universal positioning fixture for rear wheel steering gear according to claim 1, characterized in that, The position adjustment structure includes a screw and a slider; the slider is slidably installed in the groove of the arm body and fixedly connected to the end face gear plate; the screw is threadedly engaged with the slider; rotating the screw can drive the end face gear plate to rise and fall axially.

4. The universal positioning fixture for rear wheel steering gear according to claim 1 or 3, characterized in that, The connecting rod fastening bolt has a limit body on its body to prevent the connecting rod fastening bolt from separating from the arm body.

5. The universal positioning fixture for rear wheel steering gear according to claim 1, characterized in that, The long groove is a T-shaped long groove, and the base plate fastening assembly includes a base plate fastening bolt and a nut inside the groove. The nut inside the groove can move in the T-shaped long groove, and both sides of the base are provided with mating grooves for the base plate fastening bolt to pass through.

6. The universal positioning fixture for rear wheel steering gear according to any one of claims 1 to 3, characterized in that, The positioning post is a cylindrical stepped shaft with a positioning cone surface at the top.

7. The universal positioning fixture for rear wheel steering gear according to claim 6, characterized in that, The outer surface of the positioning post is provided with at least one raised rubber strip, which is used to press against the inner wall of the positioning hole of the rear wheel steering gear.

8. The universal positioning fixture for rear wheel steering gear according to claim 7, characterized in that, The bottom of the positioning post is provided with a stud, and the positioning arm is provided with a screw hole for the stud to be screwed in.

9. The universal positioning fixture for rear wheel steering gear according to claim 7, characterized in that, The positioning arm is provided with a ball head seat, and the bottom of the positioning column is provided with a ball head that mates with the ball head seat; the ball head seat is equipped with a ball head fastening bolt for tightening and fixing the ball head to adjust the tilt angle of the positioning column.

10. The universal positioning fixture for rear wheel steering gear according to claim 6, characterized in that, The base is made of steel; the connecting arm and the positioning arm are made of aluminum alloy; and the positioning column is made of mold steel.

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