A tire changer

Abstract

The utility model discloses a tire changer, its characterized in that, including the wheel hub locking assembly for fixing on the wheel hub axle hole of the wheel to be dismantled in the axial direction, the wheel hub locking assembly axial one end is connected with the support column of same direction setting, the other end of support column is installed the coaxial rotation's rotary support, the rotary support has the tire removing arm of radial extension setting on, tire removing arm is installed the tire removing mechanism of down pressure away from the one end of rotary support. The utility model has the advantages such as clever structure design, need not using counterweight base or through bolt fixed base can complete operation, operation convenient to use etc.

Description

Technical Field

[0001] This utility model relates to the field of tire disassembly and repair technology, and in particular to a tire changer. Background Technology

[0002] In automotive repair and tire replacement, it is usually necessary to remove the tire from the rim for repair, replacement, or maintenance. A commonly used tool for this purpose is called a tire changer. A tire changer is primarily used to separate the clamping parts between the tire and the rim. Its function is to reduce the labor intensity of manual operation, improve disassembly and assembly efficiency, and prevent damage to the tire or rim due to improper operation.

[0003] Depending on the driving method, tire changers can be divided into manual tire changers and electric or hydraulic tire changers. Among them, manual tire changers have a relatively simple structure, usually consisting of levers, hooks, pressure plates, support frames, etc. They do not require additional power, and the entire tire change process is completed manually. They are characterized by low cost, portability, and strong adaptability, and are suitable for rescue situations or personal use.

[0004] Manual tire changers require applying force to the tire during the tire-changing process. To ensure this force is fully applied, the manual tire changer typically needs to be secured. There are two common methods: one is to bolt the manual tire changer to the ground, and the other is to install a heavy base at the bottom of the manual tire changer to provide stable support and withstand the reaction force generated during tire removal. Examples include a quick manual tire changer and its usage method (CN102963223A), a manual tire changer (CN217574739U), and a manual tire removal device (CN2233329Y). However, installing a heavy base increases the overall size and weight of the structure, making it inconvenient to carry in a vehicle. While bolting reduces size and weight, the environment may not be suitable for securing the manual tire changer in temporary roadside assistance scenarios, rendering it unusable. Utility Model Content

[0005] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is: how to provide a tire changer with an ingenious structural design that can be operated without the need for a counterweight base or a base fixed by bolts, and is convenient to use.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A tire changer, characterized in that it includes a hub locking assembly for axially fixing to the hub shaft hole of the wheel to be removed, one end of the hub locking assembly being connected to a support column arranged in the same direction, the other end of the support column being mounted with a rotating support that can rotate coaxially, the rotating support having a tire removal arm that extends radially; and a tire removal mechanism that can be pressed down being mounted at the end of the tire removal arm away from the rotating support.

[0007] In use, the wheel locking assembly is fixed to the wheel hub hole of the tire to be removed, and the wheel is placed flat on the ground with the support column pointing vertically upwards. The wheel forms a stable support platform, and the tire removal operation is then performed using the downward-pressable tire removal mechanism. This structure utilizes the wheel as a support platform, providing excellent support for the tire changer without the need for a counterweight base or bolted base. This simplifies the structure, reduces its size, and makes it easier to carry. Furthermore, using the wheel as a support eliminates the need for a bolted support base or counterweight base, making it suitable for more usage scenarios and more convenient to operate.

[0008] Furthermore, the tire removal mechanism is a bird head assembly, and the support column has a support seat that cooperates with the tire removal arm. The support seat extends radially along the support column, and a tire removal pry bar fulcrum for supporting the pry bar is provided at a position away from the support column, so that the pry bar, with one end supported on the tire removal pry bar fulcrum, can pry the tire removal arm and the rotating support to rotate around the support column.

[0009] In use, press the tire head assembly down between the tire and the rim, and flip the tire edge onto the tire head of the assembly. Support the pry bar vertically at its fulcrum on the tire removal pry bar. Utilizing leverage, pry the tire removal arm and rotating support relative to the support column. During this prying process, the force applied by the pry bar to the tire removal arm and the fulcrum creates opposing torques on the support column, achieving torque balance. This allows the support column to remain stable without bolts or counterweights. Simultaneously, the tire removal arm rotates the tire head assembly relative to the support column, while the wheel hub is fixedly connected to the support column. This allows the tire and rim to be slowly removed using the prying action of the pry bar.

[0010] Furthermore, the bird head assembly includes a bird head pressure arm that is telescopically mounted on the tire-removing arm along the axial direction of the rotating support, and the tire-removing arm is provided with a hole-shaft locking mechanism for fixing the bird head pressure arm; the end of the bird head pressure arm facing the wheel hub locking assembly is equipped with a tire-removing bird head.

[0011] To remove a tire using a tire remover, first loosen the axle locking mechanism, then press down the tire remover arm to allow the remover to enter between the tire and the rim, putting it in the tire removal position. Next, tighten the axle locking mechanism. Support the pry bar at the tire remover pry bar fulcrum, and pry the tire remover arm to rotate around the support column, causing the tire remover to move along the edge of the rim, ultimately completing the removal of the tire and rim.

[0012] Furthermore, the support base is a support arm extending radially along the support column. The support arm is rotatably sleeved on the support column, and an unlockable circumferential locking mechanism is provided between the two. The circumferential locking mechanism is used to restrict the support arm from rotating in the tire-removing direction away from the tire-removing bird head.

[0013] In this way, one end of the pry bar is supported on the fulcrum of the tire-removing pry bar, away from the support column. The pry bar pushes the tire-removing arm to rotate. At this time, the force applied by the pry bar to the tire-removing arm is along the tire-removing direction of the tire-removing bird head, while the force applied by the pry bar to the support arm is away from the tire-removing direction of the tire-removing bird head. Because the circumferential locking mechanism is used to restrict the rotation of the support arm away from the tire-removing bird head, that is, when the pry bar is used, the circumferential locking mechanism prevents the support arm from rotating under the force of the pry bar, forming a fixed fulcrum. This allows the tire-removing arm to rotate in the tire-removing direction of the tire-removing bird head under the action of the pry bar. Since the circumferential locking mechanism is unlockable, after each rotation of the tire-removing arm, the circumferential locking mechanism is unlocked, allowing the support arm to rotate around the support column to a position near the tire-removing arm that is easy to pry. The circumferential locking mechanism is then locked, and the tire-removing arm is pried again. This process of moving the support arm, locking the circumferential locking mechanism, and prying the tire-removing arm is repeated until the tire-removing bird head completes one rotation of the tire-removing action. The above structure utilizes a rotatable support arm and a circumferential locking structure, allowing the support arm to provide a stable fulcrum for the pry bar at multiple positions on the support column, making it easy to pry the tire-removing arm to rotate and remove the tire using the tire-removing bird head.

[0014] Furthermore, the circumferential locking mechanism is a ratchet and pawl mechanism or a one-way bearing disposed between the support column and the support arm, so that the support arm can only rotate around the support column in the tire-removing direction of the tire-removing bird head.

[0015] In this way, the support arm can only rotate in one direction by means of a ratchet and pawl mechanism or a one-way bearing. That is, the circumferential locking mechanism is in the unlocked state in the tire-removing direction of the tire-removing bird head, and in the locked state in the tire-removing direction away from the tire-removing bird head. This allows the support arm to provide a stable fulcrum for the pry bar at multiple positions on the support column, and the movement of the support arm position is completed without the need for an additional unlocking action, making the operation simpler.

[0016] Furthermore, the side of the support arm forms the fulcrum of the tire removal pry bar; or the fulcrum of the tire removal pry bar is a pry hole provided on the support arm, the pry hole being provided along the axial direction of the support column, and at least one being provided along the rotation direction of the support arm.

[0017] In this way, the side of the support arm can be used as a fulcrum for tire removal prying. Alternatively, the pry holes on the support arm can be used as fulcrums for tire removal prying. If the support arm has sufficient rotational dimension, multiple pry holes can be provided. At a locked position of the support arm, prying can be performed by changing the pry holes, reducing the number of circumferential movements of the support arm and making tire removal more convenient.

[0018] Furthermore, the support base is a support plate coaxially mounted on the support column, and the fulcrum of the tire removal pry bar is a pry hole provided on the support plate. The pry holes are arranged along the axial direction of the support column and are distributed in multiple ways along the circumference of the support plate.

[0019] In this way, after rotating the tire-removing arm by pushing it with the pry bar, the pry bar is moved to a pry hole near the tire-removing arm for easier prying, and the tire-removing arm is rotated again. This operation is repeated until the tire-removing bird head completes one revolution of tire removal. The support plate and support column are fixedly installed, reducing the number of parts in the whole system, lowering the probability of damage, and improving service life and reliability.

[0020] Furthermore, the tire removal mechanism is a tire pressing assembly, which includes a tire pressing arm that is integrally telescopically arranged along the axial direction of the rotating support. The end of the tire pressing arm facing the wheel hub locking assembly has a tire pressing plate. A pry bar seat is provided on the side of the tire pressing arm away from the rotating support. The side of the pry bar seat facing the rotating support has a tire pressing pry bar fulcrum for supporting the pry bar, so that the pry bar, one end of which is supported on the tire pressing pry bar fulcrum, can pry the tire pressing arm downward to extend it downward to press the tire.

[0021] By supporting one end of the pry bar on the fulcrum of the tire pressure pry bar and pressing down on the pry bar, the leverage principle applies pressure to the tire pressure pry arm, causing it to extend downwards. The tire pressure pry plate presses down on the tire, separating it from the rim. After releasing the pry bar, the tire's own rebound force pushes the tire pressure pry arm upwards. Since the rotating bracket is rotatably mounted on the support column, rotating the tire removal arm to a new position and repeatedly pressing down on the pry bar can separate the tire from the rim at different locations.

[0022] Furthermore, the tire-removing arm has a clearance hole that extends through the axial direction of the rotating support, and a guide sleeve is fitted on the tire-pressing arm. The two sides of the guide sleeve are rotatably mounted in the clearance hole via a pivot perpendicular to the tire-removing arm, so that the tire-pressing arm can rotate around the pivot in the axial plane of the rotating support.

[0023] Because the clearance hole is axially continuous along the support column, and the pivot on the guide sleeve is perpendicular to the tire-removing arm, both ends of the guide sleeve and the tire-pressing blade arm can swing vertically around the pivot in the radial direction of the support column. This allows the tire-pressing blade to rotate to the appropriate position on the tire for different diameters, thus accommodating tire removal needs of various sizes. Furthermore, since the pry bar generates a force perpendicular to the tire-pressing blade arm when tilted downwards, rotatably mounting the guide sleeve within the clearance hole allows it to rotate adaptively under this force, preventing excessive friction caused by the force acting directly between the guide sleeve and the tire-pressing blade arm. This allows the tire-pressing blade arm to press down more easily.

[0024] Furthermore, the guide sleeve and the tire pressing arm have a circumferential limiting structure, so that the tire pressing arm and the guide sleeve can only move relative to each other along the axial direction.

[0025] In this way, by setting a circumferential limiting structure between the guide sleeve and the tire pressure scraper arm, the relative rotation between the two can be restricted, thus ensuring that the tire pressure scraper plate is always in the optimal working direction. This eliminates the need to divert attention to adjusting the direction of the tire pressure scraper plate during tire removal, making the operation more convenient. Furthermore, the circumferential limiting structure also prevents the tire pressure scraper arm from wobbling during tire pressure, ensuring that the pressure force is reliably transmitted to the tire, resulting in better tire loosening and more stable and effortless operation.

[0026] Furthermore, the tire pressure shovel arm is a polygonal prism, and the guide sleeve has a polygonal hole that matches the tire pressure shovel arm. The polygonal prism and the polygonal hole cooperate to form the circumferential limiting structure.

[0027] In this way, the combination of polygonal prisms and polygonal holes forms a circumferential limiting structure, which makes the structure simpler and more reliable.

[0028] Furthermore, the pry bar seat extends in a direction away from the wheel hub locking assembly, and multiple tire pressure pry bar fulcrums are distributed along the extension direction of the pry bar seat; the guide sleeve and the tire pressure shovel arm have an openable hole-shaft locking mechanism, so that the two can be locked in any position and can move relative to each other when the hole-shaft locking mechanism is open.

[0029] In this way, if the travel of the tire pressure blade under one prying action is insufficient to separate the tire from the rim, the tire pressure blade arm can be temporarily locked in the current position by the hole shaft locking mechanism. The pry bar can be moved to a lower tire pressure pry bar fulcrum, and the hole shaft locking mechanism can be activated to continue prying, thereby increasing the total travel of the tire pressure blade until the separation of the tire and the rim is completed.

[0030] Furthermore, both ends of the wheel hub locking assembly have a connection structure that cooperates with the support column, and the support column is detachably connected to either end of the wheel hub locking assembly; in the tire removal state, the length of the end of the wheel hub locking assembly away from the support column matches the height of the side of the wheel to be removed away from the support column, so that the support column is vertically positioned as a whole when the wheel to be removed is laid upside down on the ground or on the support surface.

[0031] In this way, because the length of the wheel locking assembly away from the support column matches the height of the wheel to be removed away from the support column, the wheel to be removed can be placed upside down on the ground or a supporting surface, allowing the support column to be set vertically. Specifically, when the wheel locking assembly is shorter, the side of the wheel to be removed can fully contact the horizontal ground or supporting surface, making the support column completely vertical, with the wheel providing stable support. If the length of the wheel locking assembly is slightly higher than the side height of the wheel to be removed, the wheel locking assembly and the side of the wheel to be removed together support the ground, forming a support. At this time, the support column is not completely vertical, but it is still vertically positioned, allowing for tire removal. Furthermore, since the support column can be installed at either end of the wheel locking assembly, after separating the tire from the rim on one side of the wheel, simply detach the support column from the wheel locking assembly, flip the wheel to be removed and the wheel locking assembly together, and then install the support column at the other end of the wheel locking assembly. No secondary disassembly and reassembly of the wheel is required, making the operation more convenient.

[0032] Furthermore, the connection structure is a connection hole coaxially disposed on the hub locking assembly, the cross-sectional shape of the connection hole is consistent with the cross-sectional shape of the support column, and the support column is inserted into the connection hole; a hole-shaft locking mechanism for fixing the support column is provided between the connection hole and the support column.

[0033] In this way, the connection structure between the support column and the connecting hole can be simplified, and the reliability of the connection between the two can be guaranteed.

[0034] Furthermore, the wheel hub locking assembly includes a support shaft, on which a clamping tray and a clamping cone are coaxially mounted. The clamping cone has a clamping cone with a gradually decreasing diameter on the side facing the clamping tray and is axially movable and sleeved on the support shaft. The clamping tray includes a support cylinder coaxially sleeved on the support shaft. The inner diameter of the support cylinder is larger than the outer diameter of the support shaft, and an annular receiving cavity is formed between the two, into which the clamping cone can extend. One end of the support cylinder facing the clamping cone has a support tray extending radially outward, and the other end is connected to the support shaft. The support shaft has a locking thread and a locking nut, the locking thread being located on the side of the clamping tray facing the clamping cone. The clamping tray has an adjustable positioning protrusion, such that the center distance between the positioning protrusion and the support shaft can match the position of the bolt hole on the wheel to be removed.

[0035] In this way, the hub hole of the wheel to be removed is fitted onto the support shaft. The position of the positioning protrusion is adjusted so that one of the bolt holes on the hub fits onto the protrusion. The clamping cone is then inserted and the lock nut is tightened. By utilizing the engagement between the clamping cone and the center hole of the hub, the wheel to be removed and the support shaft are fixedly connected in a coaxial state. The wheel to be removed is then laid down on the ground or a supporting surface. Since the support column is coaxial with the wheel to be removed, the wheel, when laid down, uses its own weight to provide support, allowing the support column to be set vertically.

[0036] Furthermore, the hole-shaft locking mechanism includes a threaded hole that extends radially through the hole wall and a locking bolt disposed in the threaded hole; In this way, fixing the hole and shaft with locking bolts greatly simplifies the structure of the hole and shaft locking mechanism, reduces the number of parts, lowers the probability of damage, and extends service life.

[0037] In summary, this utility model has the advantages of ingenious structural design, operation without the need for a counterweight base or bolt fixing of the base, and convenient operation. Attached Figure Description

[0038] Figure 1 This is an exploded view of the wheel hub locking assembly in this embodiment.

[0039] Figure 2 This is a side view of the hub locking assembly in this embodiment.

[0040] Figure 3 This is a schematic diagram of the tire changer in the tire-pressed state in this embodiment.

[0041] Figure 4 for Figure 3 A side view structural diagram.

[0042] Figure 5 This is a schematic diagram of the tire changer in the tire pressing operation state in this embodiment.

[0043] Figure 6 This is a schematic diagram of the tire pressure assembly.

[0044] Figure 7 This is a schematic diagram of the tire changer in the bird-head tire removal state in this embodiment.

[0045] Figure 8 This is a schematic diagram of the tire changer in the bird-head tire removal operation state.

[0046] Figure 9 This is a schematic diagram of the bird head assembly.

[0047] Figure 10 This is a schematic diagram of the structure supported on the ground by the wheels to be removed.

[0048] Figure 11 This is a schematic diagram of the cooperation structure between the support column and the support arm.

[0049] Figure 12 for Figure 11 A schematic diagram of its decomposed structure.

[0050] Figure 13 This is an exploded structural diagram of the support column and another type of support arm. Detailed Implementation

[0051] The present invention will be further described in detail below with reference to the embodiments.

[0052] In practical implementation: such as Figures 1-10 As shown, a tire changer includes a hub locking assembly 1 for axially fixing to the hub shaft hole of the wheel to be removed. One end of the hub locking assembly 1 is connected to a support column 2 arranged in the same direction. The other end of the support column 2 is equipped with a rotating support 3 that can rotate coaxially. The rotating support 3 has a tire removal arm 4 that extends radially. The end of the tire removal arm 4 away from the rotating support 3 is equipped with a tire removal mechanism that can be pressed down.

[0053] Both ends of the wheel hub locking assembly 1 have connection structures that mate with the support column 2. The support column 2 is detachably connected to either end of the wheel hub locking assembly 1. In the tire-removed state, the length of the end of the wheel hub locking assembly 1 away from the support column 2 matches the height of the side of the wheel to be removed away from the support column 2, so that the support column 2 is vertically positioned when the wheel to be removed is laid upside down on the ground or on a support surface. In this embodiment, the connection structure is a connection hole coaxially arranged on the wheel hub locking assembly 1. The cross-sectional shape of the connection hole is consistent with the cross-sectional shape of the support column 2, and the support column 2 is inserted into the connection hole. A hole-shaft locking mechanism for fixing the support column 2 is provided between the connection hole and the support column 2. By cooperating with the support column and the connection hole, the connection structure between the support column and the wheel hub locking assembly can be simplified, while ensuring the reliability of the connection between the two.

[0054] Because the length of the wheel locking assembly away from the support post matches the height of the wheel to be removed away from the support post, the wheel can be placed down on the ground or a supporting surface, allowing the support post to be vertically positioned. Specifically, when the wheel locking assembly is shorter, the side of the wheel can fully contact the horizontal ground or supporting surface, making the support post completely vertical, with the wheel providing stable support. However, if the length of the wheel locking assembly is slightly greater than the height of the side of the wheel, the wheel locking assembly and the side of the wheel together support the ground, forming a support. In this case, the support post is not completely vertical, but it is still vertical, allowing for tire removal.

[0055] In this embodiment, as Figure 1 and Figure 2As shown, the hub locking assembly 1 includes a support shaft 11, on which a clamping tray 12 and a clamping cone 13 are coaxially mounted. The clamping cone 13 has a clamping cone with a gradually decreasing diameter on the side facing the clamping tray 12, and is axially movable and sleeved on the support shaft 11. The clamping tray 12 includes a support cylinder 121 coaxially sleeved on the support shaft 11. The inner diameter of the support cylinder 121 is larger than the outer diameter of the support shaft 11, and a space is formed between them into which the clamping cone can extend. An annular receiving cavity; the support cylinder 121 has a support tray 122 extending radially outward at one end facing the clamping cone 13, and the other end is connected to the support shaft 11; the support shaft 11 has a locking thread and a locking nut, the locking thread being located on the side of the clamping tray 12 facing the clamping cone 13; the clamping tray 12 has an adjustable positioning protrusion, so that the center distance between the positioning protrusion and the support shaft 11 can match the position of the bolt hole on the wheel to be removed. In this embodiment, the support tray 122 has a radially arranged strip hole, the positioning protrusion is slidably fitted in the strip hole, and the connecting hole is coaxially and through the support shaft 11.

[0056] In use, place the hub axle hole of the wheel to be removed onto the support shaft, adjust the position of the positioning protrusion so that one bolt hole on the hub fits onto the protrusion, insert the clamping cone and tighten the lock nut. The clamping cone engages with the center hole of the hub to fix the wheel to be removed and the support shaft in a coaxial position. Lay the wheel to be removed down on the ground or a supporting surface. Because the support column is coaxial with the wheel, the wheel, when laid down, uses its own weight to provide support, allowing the support column to be set vertically.

[0057] In this embodiment, the tire removal mechanism is divided into tire pressure assembly 5 and bird head assembly 6, depending on the different steps of tire removal.

[0058] During tire pressing operations, the tire removal mechanism is the tire pressing assembly, such as... Figures 3-6As shown, the tire pressing assembly 5 includes a tire pressing arm 51 that is integrally telescopically arranged along the axial direction of the rotating support 3. The end of the tire pressing arm 51 facing the wheel hub locking assembly 1 has a tire pressing plate 52. A pry bar seat 53 is provided on the side of the tire pressing arm 51 away from the rotating support 3. The pry bar seat 53 has a tire pressing pry bar fulcrum 54 on the side facing the rotating support 3, allowing a pry bar supported at one end on the tire pressing pry bar fulcrum 54 to pry the tire pressing arm 51 downwards to extend it for tire pressing. In use, one end of the pry bar is supported on the tire pressing pry bar fulcrum, and the pry bar is pressed down forcefully. Using the lever principle, pressure is applied to the tire pressing arm, causing it to extend downwards. The tire pressing plate presses down on the tire, separating the tire from the rim. After releasing the pry bar, the tire's own rebound force pushes the tire pressing arm upwards. Because the rotating bracket is rotatably mounted on the support column, rotating the tire-removing arm to a new position and repeatedly pressing down the pry bar can separate the tire from the rim at different positions.

[0059] When the pry bar is tilted and pressed down, a component force perpendicular to the tire pressure shovel arm is generated, causing the upper end of the tire pressure shovel arm to deflect towards the rotating support. This easily leads to significant frictional resistance in the axial movement of the tire pressure shovel arm, commonly known as "locking," making the downward pressing of the tire pressure shovel arm difficult. To address this, the tire removal arm 4 has a clearance hole that extends through the axial direction of the rotating support 3. A guide sleeve 55 is fitted onto the tire pressure shovel arm 51. The two sides of the guide sleeve 55 are rotatably mounted in the clearance hole via a pivot perpendicular to the tire removal arm 4, allowing the tire pressure shovel arm 51 to rotate around the pivot in the axial plane of the rotating support 3. Rotating the guide sleeve in the clearance hole allows it to adapt to the force of the pry bar, preventing this force from directly acting between the guide sleeve and the tire pressure shovel arm and generating excessive friction, thus allowing the tire pressure shovel arm to press down more easily. Furthermore, because the clearance hole is axially continuous along the support column, and the pivot on the guide sleeve is perpendicular to the tire-removing arm, both ends of the guide sleeve and the tire-pressing blade arm can swing vertically around the pivot in the radial direction of the support column. This allows the tire-pressing blade to rotate to a suitable position on the tire for different diameters, thus accommodating tire removal needs of various sizes. In practice, the tire-removing arm 4 can be designed as a telescopic structure to adjust the distance between the tire-pressing blade arm and the support column, adapting to tires of different diameters; alternatively, a tire-removing arm 4 of corresponding length can be designed specifically for common tire models.

[0060] Meanwhile, a circumferential limiting structure exists between the guide sleeve 55 and the tire pressure shovel arm 51, allowing the tire pressure shovel arm 51 and the guide sleeve 55 to move relative to each other only along the axial direction. In this embodiment, the tire pressure shovel arm 51 is a polygonal prism, and the guide sleeve 55 has a polygonal hole that matches the tire pressure shovel arm 51. The polygonal prism and the polygonal hole cooperate to form the circumferential limiting structure.

[0061] By incorporating a circumferential limiting structure between the guide sleeve and the tire pressure scraper arm, relative rotation between the two is restricted, ensuring that the tire pressure scraper plate is always in the optimal working direction. This eliminates the need to focus on adjusting the scraper plate's direction during tire removal, making the operation more convenient. Furthermore, the circumferential limiting structure prevents the tire pressure scraper arm from wobbling during the tire pressure process, ensuring that the pressure force is reliably transmitted to the tire, resulting in better tire loosening and more stable and effortless operation.

[0062] Because the stroke of each prying action is limited, for wider wheels, it is impossible to separate the tire from the rim in one prying operation. Therefore, the pry bar seat 53 extends away from the wheel hub locking assembly 1, and multiple tire pressure pry bar fulcrums 54 are distributed along the extending direction of the pry bar seat 53. An openable hole-shaft locking mechanism is provided between the guide sleeve 55 and the tire pressure pry bar arm 51, allowing them to be locked in any position and to move relative to each other when the hole-shaft locking mechanism is open. In this embodiment, the tire pressure pry bar fulcrum 54 is a pry hole provided on the pry bar seat 53, such as... Figure 6 As shown. In this way, when the travel of the tire pressure blade under one prying action is insufficient to separate the tire from the rim, the tire pressure blade arm can be temporarily locked in the current position by the hole shaft locking mechanism. The pry bar can be moved to a lower tire pressure pry bar fulcrum, and the hole shaft locking mechanism can be activated to continue prying, thereby increasing the total travel of the tire pressure blade until the separation of the tire and the rim is completed.

[0063] The hole-shaft locking mechanism of this embodiment includes a threaded hole that extends radially through the hole wall and a locking bolt disposed on the threaded hole.

[0064] Using the tire changer with the above structure, when in use, the hub axle hole of the wheel to be removed is fitted onto the support shaft of the hub locking assembly 1. The positioning protrusion is aligned with the mounting bolt hole on the wheel. The clamping cone 13 and the locking nut are then installed in sequence. The clamping cone engages with the center hole of the hub to fix the wheel to be removed and the support shaft in a coaxial state. One end of the pry bar is inserted into the pry hole of the pry bar seat 53, using the pry hole as the fulcrum of the tire pressure pry bar. The tire pressure arm is positioned directly below the pry bar, and the pry bar is pressed down, moving the tire pressure arm down along the guide sleeve 55 to the lowest position. If the tire is still not separated from the rim, the locking bolt of the hole-shaft locking mechanism is used to temporarily fix the tire pressure arm in the guide sleeve 55. One end of the pry bar is then inserted into the pry hole at a lower position. The locking bolt of the hole-shaft locking mechanism is loosened, and the pry bar is pressed down again. This operation is repeated until the tire is separated from the rim. After the pry bar is released, the tire pressure arm is raised under the elastic force of the tire itself. Push the tire-removing arm around the support column to move the tire-pressing assembly to a new position, and repeat the tire-pressing operation as described above until one side of the tire is completely separated from the rim. Disconnect the support column from the rim locking assembly, flip the wheel to be removed and the rim locking assembly together, and then install the support column on the other end of the rim locking assembly. There is no need to remove and reinstall the wheel again. Repeat the tire-pressing steps as described above to complete the tire-pressing operation on the other side of the tire.

[0065] When performing tire removal operations using the bird's head assembly, the tire removal mechanism is the bird's head assembly. For example... Figures 7-9 As shown, the bird head assembly 6 includes a bird head pressure arm 61 that is telescopically mounted on the tire removal arm 4 along the axial direction of the rotating support 3. The tire removal arm 4 is provided with a hole-shaft locking mechanism for fixing the bird head pressure arm 61. A tire removal bird head 62 is mounted on one end of the bird head pressure arm 61 facing the wheel hub locking assembly 1. The support column 2 has a support seat 7 that cooperates with the tire removal arm 4. The support seat 7 extends radially along the support column 2, and a tire removal pry bar fulcrum 71 for supporting the pry bar is provided at a position away from the support column 2, so that the pry bar, with one end supported on the tire removal pry bar fulcrum 71, can pry the tire removal arm 4 and the rotating support 3 to rotate around the support column 2.

[0066] When using a tire remover to remove a tire, first loosen the axle locking mechanism, press down the tire remover arm to allow the tire remover to enter between the tire and the rim, and flip the tire edge onto the tire remover assembly, putting it in the tire removal position. Then, lock the axle locking mechanism. Support the pry bar vertically at its fulcrum on the tire remover pry bar. Using leverage, pry the tire remover arm and rotating support relative to the support column. During this prying process, the force applied by the pry bar to the tire remover arm and the pry bar fulcrum creates opposing torques on the support column, achieving torque balance. This allows the support column to remain stable without bolted bases or counterweight bases. Simultaneously, the tire remover arm drives the tire remover assembly to rotate relative to the support column, while the wheel hub is fixedly connected to the support column. This allows the tire and rim to be slowly removed using the prying action of the pry bar.

[0067] In this embodiment, the support base 7 is a support plate coaxially mounted on the support column 2, and the tire removal pry bar fulcrum 71 is a pry hole provided on the support plate. The pry holes are arranged along the axial direction of the support column and are distributed circumferentially along the support plate. After the tire removal arm is rotated by the pry bar, the pry bar is moved to a pry hole near the tire removal arm for easier prying, and the tire removal arm is rotated again. This operation is repeated until the tire removal pry bar completes one revolution of tire removal. The support plate and support column are fixedly installed, reducing the number of parts, lowering the probability of damage, and improving service life and reliability.

[0068] The hole-shaft locking mechanism of this embodiment includes a threaded hole radially extending through the hole wall and a locking bolt disposed in the threaded hole. The locking bolt secures the hole and shaft, greatly simplifying the structure of the hole-shaft locking mechanism, reducing the number of parts, lowering the probability of damage, and increasing service life.

[0069] In this embodiment, the support base 7 is set as a support plate coaxially fixed on the support column 2, which simplifies the overall structure, reduces the probability of damage, and helps to improve service life. When using the bird head assembly of this embodiment to perform the bird head tire removal operation, after completing the above-mentioned tire pressing operation, the bird head pressing arm is pressed down, allowing the tire removal bird head to enter between the tire and the rim, and the tire edge is flipped onto the bird head of the bird head assembly, in the tire removal state. At this time, the wheel to be removed still serves as the support part of the entire tire changer, such as... Figure 10As shown. During operation, insert the pry bar vertically into a pry hole below the tire removal arm and pry it towards the tire removal arm, causing the tire removal arm to rotate towards the tire removal bird head 62 in the tire removal direction. After completing one prying operation, change the pry hole and continue to pry and rotate the tire removal arm. Repeat this process until the tire removal bird head 62 removes the edge of the tire from the rim. Lift the tire up so that the other edge of the tire is close to the upper edge of the rim, allowing the tire removal bird head to enter between the other tire edge and the upper edge of the rim. Flip the tire edge onto the bird head of the bird head assembly, putting it in the tire removal position. Repeat the above tire removal operation to complete the removal of the other side of the tire.

[0070] In addition to fixing the support base 7 to the support column 2 in this embodiment, in specific implementations, the support base 7 can also be configured to rotate around the support column 2. Specifically, the support base 7 is a support arm extending radially along the support column 2. The support arm is rotatably sleeved on the support column 2, and an unlockable circumferential locking mechanism is provided between the two. The circumferential locking mechanism is used to restrict the support arm from rotating in the tire-removing direction away from the tire-removing bird head 62. The side of the support arm forms the fulcrum 71 of the tire-removing pry bar, that is, the outer side of the support arm is directly used as the support point of the pry bar for prying, without the need to set a pry hole structure on the support arm.

[0071] In use, support one end of the pry bar on the fulcrum of the tire-removing pry bar, away from the support column. Push the tire-removing arm to rotate using the pry bar. At this time, the force applied to the tire-removing arm by the pry bar is along the tire-removing direction of the tire-removing tool, while the force applied to the support arm is away from this direction. Because the circumferential locking mechanism restricts the support arm from rotating away from the tire-removing direction, when the pry bar is used, the circumferential locking mechanism prevents the support arm from rotating under the force of the pry bar, forming a fixed fulcrum. This allows the tire-removing arm to rotate in the tire-removing direction of the tire-removing tool under the action of the pry bar. Since the circumferential locking mechanism is unlockable, after each rotation of the tire-removing arm, unlock the circumferential locking mechanism, allowing the support arm to rotate around the support column to a position near the tire-removing arm for easy prying. Lock the circumferential locking mechanism, then pry the tire-removing arm again. Repeat the steps of moving the support arm – locking the circumferential locking mechanism – prying the tire-removing arm until the tire-removing tool completes one rotation of the tire-removing tool. The above structure utilizes a rotatable support arm and a circumferential locking structure, allowing the support arm to provide a stable fulcrum for the pry bar at multiple positions on the support column, making it easy to pry the tire-removing arm to rotate and remove the tire using the tire-removing bird head.

[0072] The circumferential locking mechanism is a ratchet-pawl mechanism or a one-way bearing disposed between the support column 2 and the support arm, allowing the support arm to rotate only around the support column 2 in the tire-removing direction towards the tire-removing bird head 62. By enabling the support arm to rotate only in one direction—that is, the circumferential locking mechanism is unlocked in the tire-removing direction of the tire-removing bird head and locked in the tire-removing direction away from the tire-removing bird head—it allows the support arm to provide a stable fulcrum for the pry bar at multiple positions on the support column, without requiring additional unlocking action to move the support arm, making operation simpler. In this configuration, the ratchet-pawl mechanism or one-way bearing can also be replaced with other unidirectional rotation mechanisms in the prior art.

[0073] In addition, in specific implementations, the circumferential locking mechanism can also adopt a keyway fit structure, such as... Figure 11 and Figure 12 As shown, at the position where the support arm and support column 2 are interlocked, keys and grooves extending axially are respectively provided on the support arm and support column 2, and multiple keys and grooves are evenly distributed circumferentially. During operation, the support arm is moved axially along the support column to the smooth rod area below the rotating support 3, allowing the keyways to disengage (i.e., unlock). Then, the support arm is rotated to the new position, and the support arm is moved in the opposite direction, allowing the keyways to re-engage. The keyway engagement restricts the rotation of the support arm. Alternatively, the circumferential locking mechanism can employ a pin hole or pin groove structure. At the position where the support arm and support column 2 are interlocked, radial holes or grooves are provided on the support column 2, with multiple holes or grooves evenly distributed circumferentially. Corresponding pin slots are provided on the support arm, and pins or screws are inserted. After rotating the support arm, the pins or screws are inserted into the holes or grooves, locking the circumferential rotation of the support arm.

[0074] In the above-described support arm design, only the side of the support arm can be used as the fulcrum 71 for the tire removal pry bar. Each time the pry bar is pressed, the support arm needs to be rotated once. To reduce the number of rotations, a design combining a support plate can be implemented, increasing the circumferential dimension of the support arm around the support column and providing pry holes on the support arm. Specifically, the tire removal pry bar fulcrum 71 is a pry hole located on the support arm. This pry hole is positioned along the axial direction of the support column, and at least one is provided along the rotation direction of the support arm. Figure 13 As shown. In this way, the pry hole on the support arm is used as the fulcrum for the tire removal prying operation. At one of the locked positions of the support arm, the prying hole can be changed to reduce the number of circumferential movements of the support arm, making the tire removal operation more convenient.

[0075] Compared to the support plate solution, the aforementioned support arm has a smaller radial footprint and is easier to store. Furthermore, in this embodiment, the pry bar and the fulcrum of the tire removal pry bar or the tire pressure pry bar are detachable; that is, the pry bar can be installed independently. In practice, the pry bar can also be directly hinged to the corresponding fulcrum. Even with a hinged connection, the fulcrum of the tire removal pry bar or the tire pressure pry bar still serves to provide support for the pry bar.

[0076] In summary, the tire changer of this embodiment, by fixing the wheel hub locking assembly to the wheel hub hole of the tire to be removed, and placing the wheel flat on the ground with the support column pointing vertically upwards, utilizes the wheel to form a stable support platform. The tire removal operation is then performed using a downward-pressable tire removal mechanism. Using the wheel as a support platform allows the tire changer to have good support without the need for a counterweight base or a bolted base, simplifying the structure, reducing its size, and making it easy to carry. Furthermore, using the wheel as a support eliminates the need for a bolted support base or counterweight base, making it suitable for more usage scenarios and more convenient to operate.

[0077] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tire changer, characterized in that, The present invention includes a hub locking assembly (1) for axially fixing to the hub shaft hole of the wheel to be removed. The hub locking assembly (1) includes a support shaft (11), on which a pressure tray (12) and a pressure cone (13) are coaxially mounted. The pressure cone (13) is axially movably sleeved on the support shaft (11). The support shaft (11) has a locking thread and a locking nut. The locking thread is located on the side of the pressure tray (12) facing the pressure cone (13). One end of the wheel hub locking assembly (1) is connected to a support column (2) arranged in the same direction. The other end of the support column (2) is equipped with a rotating support (3) that can rotate coaxially. The rotating support (3) has a tire removal arm (4) that extends radially. The end of the tire removal arm (4) away from the rotating support (3) is equipped with a tire removal mechanism that can be pressed down.

2. The tire changer as described in claim 1, characterized in that, The tire removal mechanism is a bird head assembly. The support column (2) has a support seat (7) that cooperates with the tire removal arm (4). The support seat (7) extends radially along the support column (2) and has a tire removal pry bar fulcrum (71) for supporting the pry bar at a position away from the support column (2), so that the pry bar supported at one end on the tire removal pry bar fulcrum (71) can pry the tire removal arm (4) and the rotating support (3) to rotate around the support column (2).

3. The tire changer as described in claim 2, characterized in that, The bird head assembly (6) includes a bird head pressure arm (61) that is telescopically mounted on the tire removal arm (4) along the axial direction of the rotating support (3). The tire removal arm (4) is provided with a hole-shaft locking mechanism for fixing the bird head pressure arm (61). A tire removal bird head (62) is mounted on one end of the bird head pressure arm (61) facing the wheel hub locking assembly (1).

4. The tire changer as described in claim 3, characterized in that, The support base (7) is a support arm that extends radially along the support column (2). The support arm is rotatably sleeved on the support column (2), and an unlockable circumferential locking mechanism is provided between the two. The circumferential locking mechanism is used to restrict the support arm from rotating in the tire-removing direction away from the tire-removing bird head (62).

5. The tire changer as described in claim 4, characterized in that, The circumferential locking mechanism is a ratchet and pawl mechanism or a one-way bearing disposed between the support column (2) and the support arm, so that the support arm can only rotate around the support column (2) in the tire-removing direction toward the tire-removing bird head (62).

6. The tire changer as described in claim 4, characterized in that, The side of the support arm forms the tire-removing pry bar fulcrum (71); or the tire-removing pry bar fulcrum (71) is a pry hole provided on the support arm, the pry hole is provided along the axial direction of the support column, and at least one is provided along the rotation direction of the support arm.

7. The tire changer as described in claim 3, characterized in that, The support base (7) is a support plate coaxially mounted on the support column (2). The tire removal pry bar fulcrum (71) is a pry hole set on the support plate. The pry holes are set along the axial direction of the support column and are distributed in multiple ways along the circumference of the support plate.

8. The tire changer as described in claim 1, characterized in that, The tire removal mechanism is a tire pressing assembly. The tire pressing assembly (5) includes a tire pressing arm (51) that is axially telescopically arranged along the rotating support (3). The tire pressing arm (51) has a tire pressing plate (52) at one end facing the wheel hub locking assembly (1). A pry bar seat (53) is provided on the side of the tire pressing arm (51) away from the rotating support (3). The pry bar seat (53) has a tire pressing pry bar fulcrum (54) for supporting the pry bar on the side facing the rotating support (3), so that the pry bar supported on the tire pressing pry bar fulcrum (54) can pry the tire pressing arm (51) downward to extend the tire pressing arm downward.

9. The tire changer as described in claim 8, characterized in that, The tire-removing arm (4) has a clearance hole that extends through the axial direction of the rotating support (3). The tire-pressing shovel arm (51) is fitted with a guide sleeve (55). The two sides of the guide sleeve (55) are rotatably installed in the clearance hole through a rotating shaft perpendicular to the tire-removing arm (4), so that the tire-pressing shovel arm (51) can rotate around the rotating shaft in the axial plane of the rotating support (3).

10. The tire changer as described in claim 9, characterized in that, The guide sleeve (55) and the tire pressing arm (51) have a circumferential limiting structure, so that the tire pressing arm (51) and the guide sleeve (55) can only move relative to each other along the axial direction.

11. The tire changer as claimed in claim 10, characterized in that, The tire pressing arm (51) is a polygonal prism, and the guide sleeve (55) has a polygonal hole that matches the tire pressing arm (51). The polygonal prism and the polygonal hole cooperate to form the circumferential limiting structure.

12. The tire changer as described in claim 9, characterized in that, The pry bar seat (53) extends away from the wheel hub locking assembly (1), and multiple tire pressure pry bar fulcrums (54) are distributed along the extension direction of the pry bar seat (53); the guide sleeve (55) and the tire pressure shovel arm (51) have an openable hole shaft locking mechanism, so that the two can be locked in any position and can move relative to each other when the hole shaft locking mechanism is open.

13. The tire changer as claimed in claim 1, characterized in that, Both ends of the wheel hub locking assembly (1) have a connection structure that cooperates with the support column (2). The support column (2) is detachably connected to either end of the wheel hub locking assembly (1). In the tire removal state, the length of the end of the wheel hub locking assembly (1) away from the support column (2) matches the height of the side of the wheel to be removed away from the support column (2), so that the support column (2) is vertically arranged as a whole when the wheel to be removed is laid upside down on the ground or on the support surface.

14. The tire changer as claimed in claim 13, characterized in that, The connection structure is a connection hole coaxially arranged on the hub locking assembly (1). The cross-sectional shape of the connection hole is consistent with the cross-sectional shape of the support column (2). The support column (2) is inserted into the connection hole. There is a hole-shaft locking mechanism between the connection hole and the support column (2) for fixing the support column (2).

15. The tire changer as claimed in claim 1, characterized in that, The clamping cone (13) has a clamping cone with a gradually decreasing diameter on the side facing the clamping tray (12). The clamping tray (12) includes a support cylinder (121) coaxially sleeved on the support shaft (11). The inner diameter of the support cylinder (121) is larger than the outer diameter of the support shaft (11), and an annular receiving cavity is formed between the two, into which the clamping cone can extend. One end of the support cylinder (121) facing the clamping cone (13) has a support tray (122) extending radially outward, and the other end is connected to the support shaft (11). The clamping tray (12) has a position-adjustable positioning protrusion, so that the center distance between the positioning protrusion and the support shaft (11) can match the position of the bolt hole on the wheel to be removed.

16. The tire changer as described in claim 3, 12, or 14, characterized in that, The hole-shaft locking mechanism includes a threaded hole that extends radially through the hole wall and a locking bolt disposed in the threaded hole.

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