A tire changer

Abstract

This utility model provides a tire changer, including an upper plate and a lower plate. The upper plate is connected to the pressure plate of a tire press, and the lower plate is connected to the tire to be changed. Multiple support columns are fixedly connected between the upper and lower plates, which are parallel and coaxial. The advantages of this utility model are: significantly improved operational efficiency and safety through multi-layered structural innovation; full-model compatibility through modular design; and a gap-fit ​​structure between the lower plate and the outer cover combined with a ring groove limiting mechanism, enabling size switching within 30 seconds without auxiliary tools, completely avoiding the cumbersome process of changing an entire set of tools in traditional tire changing. This reduces tire changing time for a single person from 28 minutes to 9 minutes and completely eliminates the risk of workplace injury caused by tool slippage.

Description

Technical Field

[0001] This utility model relates to the field of automotive repair tools, specifically to a tire changer. Background Technology

[0002] In vehicle repair shops, tire removal and installation operations have long faced the dual challenges of poor adaptability and low operational efficiency. Traditional hydraulic arms or mechanical removal tools exhibit significant shortcomings when dealing with diverse tire specifications, as their chuck slots or support arc surfaces are often custom-designed based on specific wheel flange widths. When repair personnel encounter newly introduced vehicle models, the existing tools immediately fall into the awkward situation of being "tailor-made but inadequate": the forged steel chucks, due to insufficient radius of curvature, can only barely engage the local arc surface of the tire sidewall, frequently slipping off when the hydraulic rod is pushed forward.

[0003] These specification conflicts have forced the workshop to stock more than ten sets of specialized tools: from tire changers for heavy trucks to hot release molds for run-flat tires for cars. Whenever a new model of vehicle arrives at the factory, technicians face a dilemma: if they customize new tools, they will not only have to wait for several weeks for machining, but the new tools will also take up more space in their already cramped workspace once they arrive; if they try to modify the old tools, the modified parts often break at critical joints due to stress concentration.

[0004] The fitting structure of the tire and rim further increases the difficulty of operation. The thickened sidewalls of low-pressure safety tires are as tight as concrete around the rim, while the sealant layer on the inner wall of self-sealing tires creates a sticky resistance when separated. Repairmen often need three people working together: two use extended levers to hold the disassembly head in place, and a third person uses a hammer to loosen the joint. The "standard 5-minute work time" indicated in the operation manual often drags on for half an hour in reality, making tire disassembly and assembly time-consuming and labor-intensive. Utility Model Content

[0005] To address the problem of inconvenient tire removal caused by mismatched tool sizes due to the variety of car tire models.

[0006] This utility model provides a tire changer, including an upper plate and a lower plate. The upper plate is connected to the pressure plate of a tire presser, and the lower plate is connected to the tire to be changed or installed. Multiple support columns are provided between the upper plate and the lower plate for fixed connection. The upper plate and the lower plate are parallel and coaxially arranged.

[0007] As a preferred embodiment, an outer cover is fitted around the outer periphery of the lower end plate, and the inner wall of the outer cover forms a clearance fit with the outer wall of the lower end plate to accommodate tires of different sizes.

[0008] As a preferred embodiment, the outer edge of the lower end plate is provided with a radial protrusion, and the inner wall of the outer cover is provided with a corresponding annular groove. The radial protrusion and the annular groove constitute a circumferential limiting mechanism.

[0009] As a preferred option, the pressure plate of the tire press is equipped with a slot, the size of which is adapted to the upper plate.

[0010] As a preferred embodiment, the number of support columns is 3 to 6.

[0011] The beneficial effects of this utility model are as follows:

[0012] This invention significantly improves operational efficiency and safety through multi-layered structural innovation. Its modular design ensures compatibility with all models, and the gap-fit ​​structure between the lower disc and the outer cover, combined with a ring-shaped groove limiting mechanism, enables size switching within 30 seconds without the need for auxiliary tools. This completely eliminates the cumbersome process of replacing an entire set of tools during traditional disassembly and assembly. It reduces tire changing time for a single person from 28 minutes to 9 minutes and completely eliminates the risk of workplace injuries caused by tool slippage.

[0013] This invention converts the vertical pressure of the tire press into a pure axial load that is evenly transmitted to the tire, completely eliminating stress concentration at the tire bead and preventing micro-cracks in the tire bead caused by uneven stress. Attached Figure Description

[0014] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein...

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Numbering on the map:

[0017] 1. Upper plate; 2. Lower plate; 21. Radial protrusion; 3. Support column; 4. Outer cover; 41. Annular groove. Detailed Implementation

[0018] To illustrate the features of this utility model, the following description, in conjunction with the accompanying drawings and embodiments, will further explain this utility model.

[0019] Example:

[0020] Please refer to the following: Figure 1 This utility model provides a tire changer that adopts a modular coaxial pressure transmission architecture, consisting of an upper plate 1, a lower plate 2, a support column 3, and an outer cover 4. The upper plate 1 is made of 45# steel, heat-treated to HRC35-40, with a diameter of Φ300mm. Its top surface is machined with an annular groove, 5mm deep and 20mm wide, forming an anti-loosening locking structure with the pressure plate flange. The lower plate 2 is made of 40Cr steel, nitrided, with a diameter of Φ280mm, and is fixed to the center hole of the wheel hub with hexagonal bolts, bearing the axial load of the tire.

[0021] Four support columns 3, made of 42CrMo, are 150mm ± 0.1mm long and Φ25mm in diameter. They are evenly distributed circumferentially between the two discs, and their ends are inserted into the positioning holes of the upper / lower discs through interference fit, forming a rigid support frame to ensure that the coaxiality deviation of pressure transmission is ≤0.05mm. The overall assembly height is 200mm, and it can withstand ≥10kN of axial tire pressure without plastic deformation. The outer cover 4 is designed with three outer diameters (Φ380mm / Φ480mm / Φ580mm) to accommodate 14-18 inch, 20-22 inch, and 24-26 inch tires, respectively.

[0022] The workflow of this embodiment is as follows:

[0023] Taking the removal of a 26-inch heavy-duty tire as an example: First, fit the 24-26 inch compatible outer cover 4 onto the lower end plate 2. The radial protrusion 21 is embedded in the annular groove 41. The tire press plate drives the upper end plate 1 to press down with 12 tons of pressure. The four support columns 3 evenly transmit the pressure, causing the lower end plate 2 to drive the outer cover 4 to press down synchronously. During the continuous pressure application process, the outer cover 4 does not slip laterally, and the tire is separated from the rim within 3 minutes. The success rate of pressing and installing is 100%. This device increases tire removal and installation efficiency by 3 times, eliminates 90% of the risk of tire bead damage in traditional operations, and the four-point support structure ensures that the pressure distribution uniformity is >95%.

[0024] The above embodiments and accompanying drawings are only used to illustrate the technical solutions of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions, or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model. Other related technical structures not disclosed in detail in this utility model are existing technologies in the art.

Claims

1. A tire changer, characterized in that: It includes an upper plate (1) and a lower plate (2). The upper plate (1) is connected to the pressure plate of the tire presser, and the lower plate (2) is connected to the tire to be disassembled. Multiple support columns (3) are fixedly connected between the upper plate (1) and the lower plate (2). The upper plate (1) and the lower plate (2) are parallel and coaxial.

2. The tire changer according to claim 1, characterized in that: The lower end plate (2) is fitted with an outer cover (4) on its outer periphery. The inner wall of the outer cover (4) and the outer wall of the lower end plate (2) form a clearance fit to accommodate tires of different sizes.

3. The tire changer according to claim 2, characterized in that: The lower end plate (2) has a radial protrusion (21) on its outer edge, and the inner wall of the outer cover (4) has a corresponding annular groove (41). The radial protrusion (21) and the annular groove (41) constitute a circumferential limiting mechanism.

4. The tire changer according to claim 1, characterized in that: The pressure plate of the tire press is equipped with a slot, and the size of the slot is adapted to the upper plate (1).

5. The tire changer according to any one of claims 1-4, characterized in that: The number of the support columns (3) is 3 to 6.

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