A tire quick centering fixture

Abstract

A tire quick centering fixture of the present invention includes a fixture main body assembly, which includes a seat body and three guide rails extending outward, each guide rail is provided with a slide seat, and a clamping claw for clamping the tire is fixed on the slide seat; a gear rack transmission mechanism includes three racks, one end of each rack is fixedly connected to the slide seat and is arranged in parallel with the guide rail in the opposite direction, a center sleeve is installed in the seat body, a gear is fixed on the center sleeve, and the three racks are respectively meshed with the gears for transmission; a locking mechanism includes a ratchet, a positioning pin rod and a positioning pin telescopic member, the ratchet is fixed on the center sleeve, and the positioning pin telescopic member drives the positioning pin rod to engage or separate with the ratchet. The present invention adopts a gear rack transmission mechanism, which can increase the adjustment stroke of the fixture, has a fast adjustment speed, and improves work efficiency. The locking mechanism can quickly control the rotation direction of the gear rack transmission mechanism and the corresponding clamping claw during operation, and the one-way rotation improves safety.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile wheel angle measurement, and in particular relates to a tire quick centering fixture. Background Art

[0002] The wheel quick centering fixtures on the market mainly include four-point fixtures and three-point fixtures. The clamping methods include lead screw type and three-point or ring positioning, two-claw tire clamping method and three-claw tire clamping method. Since most vehicles now use aluminum alloy wheels or wheel decorative covers, in order to ensure that the decoration of the wheel surface is not damaged during maintenance, more and more customers use three-claw tire clamps. At present, most three-claw tire clamps use crank-connecting rod transmission to ensure synchronous centering of the three claws. The worm gear method ensures locking or screw locking. The stroke is small, the adjustment speed is slow, and the fixture structure is relatively complex.

[0003] Therefore, the existing technical solutions have the disadvantages of small working stroke and slow adjustment speed of the existing tire centering clamp. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the shortcomings of the tire centering clamp in the prior art, such as small working stroke and slow adjustment speed.

[0005] To this end, the technical solution adopted is that a tire rapid centering fixture of the present invention comprises:

[0006] The clamp body assembly includes a hollow cylindrical seat body and three guide rails arranged along the circumference of the seat body and extending outwards, each of the guide rails is provided with a slide seat, and a clamping claw for holding the tire is fixed on the slide seat;

[0007] The gear rack transmission mechanism comprises three racks, one end of each of which is fixedly connected to the slide seat and arranged in parallel with the guide rail in the opposite direction. A central sleeve is installed in the seat body, a gear is fixed on the central sleeve, and the three racks are respectively meshed with the gears for transmission. A hand wheel is provided at the upper end of the central sleeve to drive the central sleeve to rotate;

[0008] A locking mechanism, comprising a ratchet, a positioning pin rod and a positioning pin telescopic member, wherein the ratchet is fixed on the central sleeve and arranged adjacent to the gear, and the positioning pin telescopic member drives the positioning pin rod to engage or disengage with the ratchet;

[0009] When the positioning pin rod is engaged with the ratchet, the hand wheel is rotated to drive the central sleeve to rotate unidirectionally, and the three racks are operated synchronously and drive the clamping claws to clamp the tire. When the positioning pin rod is separated from the ratchet, the hand wheel is rotated to drive the central sleeve, the racks and the clamping claws to rotate freely.

[0010] Preferably, one end of the seat body is closed, and the other end is provided with an end cover, a central hole is opened through the center of the end cover, and the central sleeve passes through the central hole.

[0011] Preferably, the three guide rails are arranged in a Y shape, and a penetrating wedge-shaped square hole is opened on the seat body below each guide rail. The rack is inserted into the wedge-shaped square hole from a direction opposite to the extension direction of the guide rail and is fixed on the corresponding slide seat.

[0012] Preferably, there is a height difference between the guide rails, and the slide seats on the guide rails have different thicknesses to compensate for the height difference, so that the clamping jaws are in the same horizontal plane.

[0013] Preferably, a guide portion is protruded from the side of the seat body, a guide hole is opened on the guide portion for the positioning pin to pass through, an annular clamping block is protruded from the front of the positioning pin, and the annular clamping block is built into the guide hole.

[0014] Preferably, the front end of the positioning pin rod is provided with an engaging portion engaged with the back of the teeth of the ratchet, and the engaging portion is sloped.

[0015] Preferably, the positioning pin telescopic member includes a connecting plate, a concave wheel, a cam and a return spring fixedly connected to the seat body, the concave wheel, the cam and the return spring are all inserted into the positioning pin rod, the concave wheel and the cam match each other and the concave wheel is fixed to the connecting plate.

[0016] One end of the return spring is pressed on the lower plane of the cam wheel, and the other end is pressed on the limit pin of the positioning pin rod. A bolt cap is fixed to the rear end of the positioning pin rod.

[0017] Preferably, the concave wheel is provided with concave inclined surfaces with several rotation angles, and the cam is provided with a convex inclined surface that matches the concave inclined surface.

[0018] Preferably, an operating handle is provided on the cam, and the connecting plate is provided with an inclined groove for the operating handle to be inserted into. When the operating handle is pulled, the convex inclined surface of the cam is driven to rotate up or down along the concave inclined surface of the concave wheel, thereby driving the positioning pin rod to separate or engage with the ratchet wheel.

[0019] Preferably, a handle is provided at the upper end of one of the guide rails.

[0020] Preferably, the outer end of the clamping claw is a clamping portion, and friction protrusions are evenly arranged on the outer side surface of the clamping portion that contacts the tire.

[0021] The technical solution of the present invention has the following advantages: the present invention adopts a gear rack transmission mechanism, which can increase the adjustment stroke of the clamp, can be calibrated or centered for tires of different models and sizes, and has a fast adjustment speed, which improves work efficiency. The locking mechanism can quickly control the rotation direction of the gear rack transmission mechanism and the corresponding clamp during operation, and can rotate in one direction to avoid reversal that would result in all previous efforts being wasted, thereby improving safety and work effectiveness. The entire clamp is operated by a hand wheel, which is simple and easy to operate, meets market demand, and has extremely high practicality.

[0022] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0023] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 It is a structural schematic diagram of the present invention.

[0026] Figure 2 It is a front view of the present invention.

[0027] Figure 3 is a cross-sectional view of the present invention;

[0028] Figure 4 It is a schematic diagram of the seat structure with guide rails in the present invention;

[0029] Figure 5 It is a schematic diagram of the wedge-shaped square hole structure of the seat body of the present invention;

[0030] Figure 6 It is a structural schematic diagram of the positioning target installation structure in the present invention;

[0031] Figure 7 It is a structural schematic diagram of the locking mechanism in the present invention;

[0032] Figure 8 is an exploded view of the locking mechanism of the present invention;

[0033] Fig. 9 A state diagram of the positioning pin rod of the present invention clamping the ratchet wheel;

[0034] Fig.10This is a state diagram of the positioning pin rod and the ratchet wheel being separated in the present invention.

[0035] The markings in the accompanying drawings are as follows: 1-seat body, 2-rack, 3-slide, 4-claw, 41-clamping part, 42-friction protrusion, 5-handwheel, 6-positioning target seat structure, 7-locking mechanism, 8-guide rail, 9-wedge-shaped square hole, 10-end cover, 11-handle, 12-center sleeve, 13-ratchet, 14-gear, 15-support, 16-positioning target seat, 17-positioning pin, 171-annular block, 172-clamping part, 18-guide part, 181-guide hole, 19-concave wheel, 191-concave inclined surface, 20-cam, 201-operating handle, 202-convex inclined surface, 21-connecting plate, 211-inclined groove, 22-reset spring, 23-bolt cap. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "middle", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is 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. The terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0038] In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" 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 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 the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] See also Figure 1 , Figure 4 , Figure 5 As shown, a tire quick centering fixture provided by the present invention includes a fixture main body component, a gear rack transmission mechanism, a locking mechanism 7, a handwheel assembly, etc. The fixture main body component includes a base body 1 and three guide rails 8 arranged at intervals along the circumference of the base body 1 and extending outward. The guide rails 8 and the base body 1 can be processed separately. A handle 11 is provided at the upper end of one of the guide rails 8 to facilitate taking and placing when not in use. The base body 1 is in the shape of a hollow cylinder, one end of the base body 1 is closed, and the other end is equipped with an end cover 10, and the center of the end cover 10 is opened with a center hole through it. A center sleeve 12 is installed in the base body 1, and the center sleeve 12 passes through the center hole. Bearings are provided on the base body 1 and the end cover 10, respectively, which are connected to the center sleeve 12 and support the rotation of the center sleeve 12.

[0041] In addition, it also includes a positioning target seat structure 6, which is composed of a positioning target seat 16 and a support 15. The support 15 is fixed to the lower end of the seat body 1. A through hole is opened in the center of the center sleeve 12. The support 15 passes through the through hole and is movably matched with the center sleeve 12. The upper end of the support 15 is connected to the positioning target seat. When the center sleeve 12 rotates, the positioning target seat 16 does not rotate with it. The positioning target seat 16 is equipped with a target target for measuring the wheel angle to perform four-wheel alignment. A hand wheel 5 is fixed to the upper end of the center sleeve 12. Rotating the hand wheel 5 drives the center sleeve 12 to rotate.

[0042] The seat body 1 is provided with three guide rails 8 along the circumference, and the three guide rails 8 are arranged in a Y-shape, which can prevent the rotating tire from hitting the ground when working. There is a height difference between the guide rails 8, and each guide rail 8 is provided with a slide 3, and a clamping claw 4 for holding the tire is fixed on the slide 3. In order to prevent the height difference of the guide rails 8 from affecting the clamping claw 4, the slide 3 on the guide rails 8 is designed to have different thicknesses to compensate for the height difference formed between the guide rails 8, so that the clamping claws 4 are finally in the same horizontal plane, and can evenly apply force when holding the tire.

[0043] The outer end of the clamping jaw 4 is a clamping portion 41. Friction protrusions 42 are evenly arranged on the outer side surface of the clamping portion 41 in contact with the tire. The arrangement of the friction protrusions 42 increases the friction between the clamping portion 41 and the tire to avoid slippage.

[0044] See also Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the gear rack transmission mechanism includes three racks 2, one end of each rack 2 is fixedly connected to the slide 3, and is arranged in parallel with the guide rail 8 in the opposite direction. Specifically, a through wedge-shaped square hole 9 is opened on the seat body 1 below each guide rail 8, and the rack 2 is inserted into the wedge-shaped square hole 9 from the direction opposite to the extension direction of the guide rail 8, and is fixed on the corresponding slide 3. During the casting process of the seat body 1, based on the fact that the three guide rails 8 are not evenly arranged, each wedge-shaped square hole 9 also adopts a wedge-shaped angle setting. In the specific manufacturing, a casting method is usually adopted, that is, a wedge-shaped core is adopted, and it is realized by a core pulling method. At this time, in order to facilitate the operation and ensure that the wedge-shaped core is not broken, the function of the wedge-shaped square hole is guaranteed, and the processing is simple and easy. The wedge-shaped square hole 9 can also be formed by cutting.

[0045] The gear 14 is fixedly arranged on the central shaft sleeve 12, and the three racks 2 are respectively meshed with the gears 14 for transmission. Since the length of the rack 2 can be set relatively flexibly, compared with the existing crank connecting rod transmission method or gear transmission method, the travel of the rack and pinion transmission can be larger, while ensuring the overall size of the product is compact. This structure can make the clamping jaw 4 suitable for tires of different sizes and specifications, and the scope of application is wider.

[0046] See also Figure 7 , Figure 8 , Fig. 9 and Fig.10 The locking mechanism 7 includes a ratchet 13, a positioning pin rod 17 and a positioning pin telescopic member. The ratchet 13 is fixed on the central sleeve 12 and is arranged adjacent to the gear 14. The two are close to each other, which is conducive to reducing the overall size. The positioning pin telescopic member drives the positioning pin rod 17 to engage or disengage with the ratchet 13.

[0047] Specifically, a guide portion 18 protrudes from the side of the seat body 1, and the guide portion 18 can be formed integrally with the seat body 1. A guide hole 181 is formed on the guide portion 18 for the positioning pin 17 to pass through. An annular clamping block 171 protrudes from the front of the positioning pin 17, and the annular clamping block 171 is built into the guide hole 181. The diameter of the annular clamping block 171 is slightly smaller than the diameter of the guide hole 181, and plays a guiding role, which can ensure that the positioning pin 17 can be smoothly extended and retracted in the guide hole 181 without tilting at a large angle.

[0048] The front end of the positioning pin rod 17 is provided with a locking portion 172 that is engaged with the back of the teeth of the ratchet 13. The locking portion 172 is sloped. When the locking portion 172 is in an engaged state with the ratchet 13, according to the working principle of the ratchet 13, the handwheel 5 rotates to drive the center sleeve 12 to rotate. Since the center sleeve 12 is fixed to the ratchet 13, the center sleeve 12 can only rotate in one direction. This unidirectional rotation can drive the clamp 4 to rotate in one direction, that is, to rotate in the direction of clamping the tire, thereby avoiding reversal that would result in all previous efforts being wasted, thereby improving safety and work effectiveness.

[0049] The positioning pin telescopic component includes a connecting plate 21, a concave wheel 19, a cam 20 and a return spring 22 fixedly connected to the seat body 1. The concave wheel 19, the cam 20 and the return spring 22 are all penetrated on the positioning pin rod 17. The concave wheel 19 and the cam 20 match each other, and the concave wheel 19 is fixed on the connecting plate 21. One end of the return spring 22 is pressed on the lower plane of the concave wheel 19, and the other end is pressed on the limit pin of the positioning pin rod 17. A bolt cap 23 is fixed to the rear end of the positioning pin rod 17.

[0050] The concave wheel 19 is provided with a concave inclined surface 191 with a plurality of rotation angles, and the cam 20 is provided with a convex inclined surface 202 which is adapted to the concave inclined surface 191. The cam 20 is provided with an operating handle 201, and the connecting plate 21 is provided with an inclined groove 211, and the operating handle 201 is clamped in the inclined groove 211. When the operating handle 201 is pulled, the convex inclined surface 202 of the cam 20 rotates and rises along the concave inclined surface 191 of the concave wheel 19, and the cam 20 pushes the nut 23 to drive the positioning pin rod 17 to move upward synchronously, thereby driving the positioning pin rod 17 to separate from the ratchet 13, and at this time, the reset spring 22 is compressed. When the lower end surface of the cam 20 rises to the upper plane of the concave wheel 19, positioning is performed, and the spring 22 is in the maximum compression state.

[0051] When the operating handle 201 is pulled again, the cam 20 rotates clockwise around the positioning pin 17, and the positioning pin 17 is reset under the elastic restoring force of the reset spring 22, and the engaging portion 172 of the positioning pin 17 and the ratchet 13 return to the engaged state.

[0052] According to the present invention, the operating handle 201 of the cam 20 can be pulled to achieve a tight fit or misalignment with the concave wheel 19, thereby driving the positioning pin rod 17 to engage or separate with the ratchet wheel 13. The structure is simple and the operation is convenient.

[0053] The working principle of this patent is as follows:

[0054] When the tire needs to be centered or calibrated, the positioning fixture is taken for use by the handle 11. Before use, the distance between the three clamping jaws 4 and the center sleeve 12 is adjusted according to the size of the tire, and the operating handle 201 is rotated by hand. The cam 20 rotates around the positioning pin rod 17 as the axis, and the convex inclined surface 202 of the cam 20 rotates and rises along the concave inclined surface 191 of the concave wheel 19, as described above, so that the positioning pin rod 17 and the ratchet 13 are in a separated state. At this time, the hand wheel 5 can be rotated according to the specific situation of the tire, so that the gear 14 is meshed and transmitted along the rack 2. After adjusting to the appropriate position, the operating handle 201 is rotated by hand to make it return to the inclined groove 211. At this time, the positioning pin rod 17 is engaged with the ratchet 13, and the hand wheel 5 can only drive the center sleeve 12 to move in one direction.

[0055] Aim the centering clamp at the tire, clamp the tire with three clamping jaws 4, rotate the hand wheel 5, the hand wheel 5 drives the center shaft sleeve 12 to rotate unidirectionally, the center shaft sleeve 12 drives the gear 14 to rotate along the rack 2, the clamping jaws 4 shrink as they rotate, gradually clamp the tire, and stop rotating after reaching a certain clamping force. Due to the existence of the locking mechanism 7, the hand wheel 5 will not reverse even if the hand is released, so the safety performance is good and the flexibility is higher.

[0056] The present invention, by adopting a rack and pinion transmission mechanism, can increase the adjustment stroke of the clamp, can be calibrated or centered for tires of different models and sizes, and has a fast adjustment speed, thereby improving work efficiency. The locking mechanism 7 can quickly control the rotation direction of the rack and pinion transmission mechanism and the corresponding clamp during operation, and can rotate in one direction to avoid reverse rotation that would result in all previous efforts being wasted, thereby improving safety and work effectiveness. The entire clamp is operated by a hand wheel, is simple and easy to operate, meets market demand, and has extremely high practicality.

[0057] It should be noted that the above embodiments are all preferred embodiments, and the relevant functional components can be replaced by other components, and the units and modules involved are not necessarily required for this application. The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0058] The above is a detailed introduction to a tire quick centering clamp provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A tire quick centering fixture, characterized in that: include: The clamp body assembly includes a hollow cylindrical seat body and three guide rails arranged along the circumference of the seat body and extending outwards, each of the guide rails is provided with a slide seat, and a clamping claw for holding the tire is fixed on the slide seat; The gear rack transmission mechanism comprises three racks, one end of each of which is fixedly connected to the slide seat and arranged in parallel with the guide rail in the opposite direction. A central sleeve is installed in the seat body, a gear is fixed on the central sleeve, and the three racks are respectively meshed with the gears for transmission. A hand wheel is provided at the upper end of the central sleeve to drive the central sleeve to rotate; A locking mechanism, comprising a ratchet, a positioning pin rod and a positioning pin telescopic member, wherein the ratchet is fixed on the central sleeve and arranged adjacent to the gear, and the positioning pin telescopic member drives the positioning pin rod to engage or disengage with the ratchet; When the positioning pin is engaged with the ratchet, the hand wheel is turned to drive the central sleeve to rotate in one direction, and the three racks are synchronously operated to drive the clamping claws to clamp the tire. When the positioning pin is separated from the ratchet, the hand wheel is turned to drive the central sleeve, the racks and the clamping claws to rotate freely. The positioning pin telescopic member includes a connecting plate fixedly connected to the seat body, a concave wheel, a cam and a return spring, the concave wheel, the cam and the return spring are all arranged on the positioning pin rod, the concave wheel and the cam match each other and the concave wheel is fixed on the connecting plate. One end of the return spring is pressed on the lower plane of the concave wheel, and the other end is pressed on the limit pin of the positioning pin rod. A bolt cap is fixed to the rear end of the positioning pin rod. The concave wheel is provided with a concave inclined surface with a plurality of rotation angles, and the cam is provided with a convex inclined surface that matches the concave inclined surface. The cam is provided with an operating handle, and the connecting plate is provided with an inclined groove for the operating handle to be inserted into. When the operating handle is pulled, the convex inclined surface of the cam is driven to rotate up or down along the concave inclined surface of the concave wheel, thereby driving the positioning pin rod to separate from or engage with the ratchet wheel; One end of the seat body is closed, and the other end is provided with an end cover, the center of the end cover is provided with a central hole, and the central sleeve passes through the central hole; The three guide rails are arranged in a Y shape, and a through wedge-shaped square hole is opened on the seat body below each guide rail, and the rack is inserted into the wedge-shaped square hole from a direction opposite to the extension direction of the guide rail and fixed on the corresponding slide seat; There is a height difference between the guide rails, and the slide seats on the guide rails have different thicknesses to compensate for the height difference, so that the clamps are in the same horizontal plane; It also includes a positioning target seat structure, which includes a positioning target seat and a support, the support is fixed at the lower end of the seat body, a through hole is opened at the center of the center sleeve, the support passes through the through hole and movably cooperates with the center sleeve, the upper end of the support is connected to the positioning target seat, and a hand wheel is fixed to the upper end of the center sleeve.

2. A tire quick centering fixture according to claim 1, characterized in that: A guide portion is protruded from the side of the seat body, and a guide hole is opened on the guide portion for the positioning pin rod to pass through. An annular clamping block is protruded from the front of the positioning pin rod, and the annular clamping block is built into the guide hole.

3. A tire quick centering fixture according to claim 1, characterized in that: The front end of the positioning pin rod is provided with an engaging portion engaged with the tooth back of the ratchet, and the engaging portion is in a slope shape.

4. A tire quick centering fixture according to claim 1, characterized in that: A handle is provided at the upper end of one of the guide rails.

5. A tire quick centering fixture according to claim 1, characterized in that: The outer end of the clamping claw is a clamping portion, and friction protrusions are evenly arranged on the outer side surface of the clamping portion that contacts the tire.

Images