Simple quick-release device for land wheel and folding bicycle

Abstract

The invention provides a simple quick release device for a land wheel, which comprises an outer sleeve, a pin sleeve and a pin shaft, the pin sleeve is axially sleeved with the outer sleeve, the pin sleeve is axially provided with a through hole and a moving part, the moving part is transversely and eccentrically provided with a sleeving hole relative to the through hole, and the moving part and the pin sleeve are integrally formed and are connected through an elastic part. An inserting head with a limiting groove is arranged at the top of the pin shaft, when the inserting head is inserted into the sleeving hole, the matching surface pushes the moving part to transversely move, the elastic part accumulates elastic force, and when the limiting groove completely reaches the sleeving hole subsequently, the moving part moves back under the action of the elastic part, so that the side wall part is partially clamped into the limiting groove, and the land wheel is quickly assembled; when the pressing part is pressed to enable the side wall part to retreat from the limiting groove, the land wheel can be quickly disassembled; the simple quick release device for the land wheel is convenient to produce and manufacture, is beneficial to reducing the cost, and realizes quick release / quick assembly; the invention further provides a folding bicycle which adopts the simple and quick release device for the land wheel.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and more specifically, to a simple and quick-release device for a ground wheel and a folding vehicle. Background Art

[0002] In daily life, small trailers, trolleys, etc. used for carrying goods are very important tools, especially in outdoor leisure activities. To facilitate use, ground wheels are usually provided.

[0003] However, the connection between the existing ground wheel and the vehicle still requires the assistance of structures such as springs to achieve a certain degree of disassembly and assembly. This not only has a high cost and relatively complex production and manufacturing, but also the disassembly and assembly are not fast. Therefore, further improvement is needed. The applicant will propose a simple and quick-release device for a ground wheel, which is not only convenient for production and manufacturing, beneficial to cost reduction, but also realizes quick disassembly / quick assembly. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a simple and quick-release device for a ground wheel, which is not only convenient for production and manufacturing, beneficial to cost reduction, but also realizes quick disassembly / quick assembly; and also propose a folding vehicle using the aforementioned simple and quick-release device for a ground wheel.

[0005] To solve the above technical problem, the present invention proposes a simple and quick-release device for a ground wheel, including, An outer sleeve tube, fixedly arranged on the vehicle; A pin sleeve, made of plastic, axially sleeved on the outer sleeve tube. The pin sleeve is axially provided with a through hole. The two ends of the through hole are respectively an insertion end and an outlet end from bottom to top. A moving part is transversely arranged at the outlet end. The moving part is provided with a socket hole transversely eccentric to the through hole. The moving part is integrally formed with the pin sleeve and connected by an elastic part; the outer sleeve tube is provided with a window. The pressing part of the moving part protrudes outward from the window in the initial state to expose the pressing part. When the pressing part is pressed / released, the socket hole and the through hole switch between concentric / eccentric positions, and the elastic part accumulates or releases elastic force, thereby unlocking / limiting the pin shaft; The pin shaft is arranged at the top of the fork of the ground wheel. The through hole is detachably sleeved with the pin shaft. The top of the pin shaft is provided with an insertion head. A limiting groove is arranged on the lower side of the insertion head. The pin shaft is inserted into the through hole from the insertion end, and the insertion head extends out from the outlet end and is further inserted into the socket hole. A mating surface is arranged between the insertion head and the socket hole. The mating surface is arranged on the insertion head. When the insertion head is inserted into the socket hole, the moving part is pushed by the mating surface to move the socket hole horizontally, and the elastic part accumulates elastic force. When the limiting groove completely reaches the socket hole subsequently, the mating surface disengages from the socket hole, so that the moving part moves back under the action of the elastic part. Then, the side wall part of the circumferential direction of the socket hole is clamped into the limiting groove to axially limit the pin shaft to realize quick installation of the ground wheel; when the socket hole is in the unlocking position, the side wall part withdraws from the limiting groove, and the insertion head can be pulled out reversely from the socket hole or fall out by gravity, so that the pin shaft is separated from the socket sleeve to quickly disassemble the ground wheel.

[0006] As an improvement, plastic elastic parts are respectively arranged on the left and right or front and back sides along the moving direction of the moving part.

[0007] As an improvement, the socket sleeve is made of high-elasticity and high-hardness engineering plastic.

[0008] As an improvement, one or more plastic elastic parts are respectively arranged on the left and right sides of the moving part and are inclined towards the pressing part to form a supporting part, or one or more plastic elastic parts are respectively arranged on the front and back sides of the moving part and are inclined towards the pressing part to form a supporting part.

[0009] As an improvement, the part of the pin shaft located in the limiting groove is a cylindrical rod, and the socket hole is provided with an arc concave surface matching with the cylindrical rod. When the socket hole is in the limiting position, the arc concave surface is transversely matched with the cylindrical rod.

[0010] As an improvement, the transverse peripheral dimensions of the socket sleeve and the moving part are smaller than the transverse inner peripheral dimension of the outer sleeve; the cross-section of the socket sleeve and the outer sleeve in sleeve connection is a circular or polygonal or D-shaped or elliptical or flat elliptical tubular body.

[0011] As an improvement, when the socket sleeve is axially sleeved on the outer sleeve, the socket sleeve is inserted into the outer sleeve from the lower end of the outer sleeve. During the insertion process, the inner side wall of the outer sleeve pushes back the pressing part so that the socket sleeve can be inserted into the outer sleeve. When the pressing part reaches the window, the pressing part extends out of the window under the action of the elastic part.

[0012] As an improvement, the stroke of the pressing part is set as: when the socket hole is in the unlocking position, the pressing part still cooperates with the window to axially limit the socket sleeve.

[0013] As an improvement, a limiting hole is provided in the circumferential part of the outer sleeve, and a limiting boss is provided on the outer circumference of the pin sleeve at a position corresponding to the limiting hole. The limiting boss is in blocking and limiting cooperation with the limiting hole; and / or, an elastic limiting part inclined inward is provided in the circumferential part of the outer sleeve, and a mating groove or hole is provided on the outer circumference of the pin sleeve at a position corresponding to the elastic limiting part. The elastic limiting part is in blocking and limiting cooperation with the mating groove or hole; and / or, a screw is further included. A connecting hole is provided on the outer circumference of the pin sleeve at a position corresponding to the limiting hole, and the screw is connected through the limiting hole and the connecting hole to fix the outer sleeve and the pin sleeve.

[0014] As an improvement, a circumferential protrusion is provided at the lower end of the pin sleeve. When the limiting boss is in blocking and limiting cooperation with the limiting hole, the circumferential protrusion is in contact with the lower end surface of the outer sleeve for axial limitation. Or when the elastic limiting part is in blocking and limiting cooperation with the mating groove or hole, the circumferential protrusion is in contact with the lower end surface of the outer sleeve for axial limitation. Or when the screw is connected through the limiting hole and the connecting hole to fix the outer sleeve and the pin sleeve, the circumferential protrusion is in contact with the lower end surface of the outer sleeve for axial limitation.

[0015] As an improvement, the insertion head is set as a conical or frustum-shaped or cylindrical head. The side surface of the cone or the side surface of the frustum or the arc surface of the cylindrical head serves as the mating surface. For the case of the cylindrical head, a bevel surface is correspondingly provided in the socket hole.

[0016] As an improvement, the inner side wall of the socket hole is a bevel surface for at least more than half from the lower end of the socket hole upwards, and this bevel surface is arranged in the opposite direction to the pressing part of the moving part.

[0017] As an improvement, the pin shaft and the pin sleeve are set as a rotatable mating relationship or a non-rotatable fixed mating relationship.

[0018] As an improvement, the rotatable mating relationship is a socket mating relationship with a circular cross-section, and the non-rotatable fixed mating relationship is a socket mating relationship with a polygonal or D-shaped or elliptical or flat-elliptical cross-section or a mating relationship limited by one or more key grooves.

[0019] As an improvement, the lower end of the pin shaft is vertically and fixedly arranged in the middle of the cross shoulder of the wheel fork.

[0020] After adopting the above structure, compared with the prior art, the present invention has the following advantages: The present disclosure does not require complex structures such as springs. It mainly consists of an outer sleeve, a pin sleeve, and a pin shaft. The outer sleeve is a sleeve, and the pin sleeve is made of plastic, so it can be integrally formed by plastic. The pin shaft can be made of metal, plastic, or other materials. Both metal and plastic can obtain the pin shaft by integral forming technology. Therefore, when manufacturing the outer sleeve, the pin sleeve, and the pin shaft, it is very convenient and efficient, which is conducive to reducing costs. Through additional improvements to the pin sleeve and the pin shaft, during assembly, the pin sleeve is inserted into the outer sleeve to form a first component with the outer sleeve. Therefore, it is conducive to simplifying the assembly and improving the assembly efficiency, thereby further reducing costs.

[0021] Since the outer sleeve is fixedly installed on the vehicle, after the pin sleeve is inserted into the outer sleeve, it is fixedly installed on the vehicle together. When quick installation is required, the pin shaft on the ground wheel is inserted into the pin sleeve to complete the quick installation. When quick disassembly is required, press the pressing part on the pin sleeve to unlock, thereby quickly disassembling the ground wheel.

[0022] In summary, the present disclosure is not only convenient for production and manufacturing, conducive to reducing costs, but also realizes quick disassembly / quick installation. Brief Description of the Drawings

[0023] Figure 1 It is a three-dimensional schematic diagram of a folding bicycle according to the present disclosure.

[0024] Figure 2 It is an enlarged three-dimensional schematic diagram of A.

[0025] Figure 3 It is an exploded schematic diagram of a simple ground wheel quick-release device in Embodiment 1.

[0026] Figure 4 It is a three-dimensional schematic diagram of a simple ground wheel quick-release device in Embodiment 1.

[0027] Figure 5 It is a front view of a simple ground wheel quick-release device in Embodiment 1.

[0028] Figure 6 It is a cross-sectional view taken along the line A-A.

[0029] Figure 7 It is an exploded schematic diagram of a simple ground wheel quick-release device in Embodiment 2.

[0030] Figure 8 It is a three-dimensional schematic diagram of a simple ground wheel quick-release device in Embodiment 2.

[0031] Figure 9 It is a front view of a simple ground wheel quick-release device in Embodiment 2.

[0032] Figure 10 It is a cross-sectional view taken along the line B-B.

[0033] Figure 11 Explosion schematic diagram of a simple and quick-release device for the ground wheel in Embodiment III.

[0034] Figure 12 Stereo schematic diagram of a simple and quick-release device for the ground wheel in Embodiment III.

[0035] Figure 13 Front view of a simple and quick-release device for the ground wheel in Embodiment III.

[0036] Figure 14 Cross-sectional view taken along C-C direction.

[0037] Figure 15 Explosion schematic diagram of a simple and quick-release device for the ground wheel in Embodiment IV.

[0038] Figure 16 Stereo schematic diagram of a simple and quick-release device for the ground wheel in Embodiment IV.

[0039] Figure 17 Front view of a simple and quick-release device for the ground wheel in Embodiment IV.

[0040] Figure 18 Cross-sectional view taken along D-D direction.

[0041] Figure 19 Enlarged stereo schematic diagram of B.

[0042] Figure 20 Stereo schematic diagram of a folding bicycle with the middle directional wheel removed and not installed.

[0043] As shown in the figure, 1. outer sleeve, 2. pin sleeve, 3. through hole, 4. moving part, 5. socket hole, 6. elastic part, 7. window, 8. pressing part, 9. pin shaft, 10. ground wheel, 11. wheel fork, 12. insertion head, 13. limiting groove, 14. mating surface, 15. side wall part, 16. cylindrical rod, 17. arc concave surface, 18. limiting hole, 19. limiting boss, 20. inclined surface, 21. universal wheel, 22. directional wheel, 23. front frame, 24. rear frame, 25. side rod, 26. bottom cross beam, 27. transverse through groove or hole, 28. screw, 29. connection hole, 30. circumferential protrusion, 31. elastic limiting part, 32. mating groove or hole, 33. middle bottom cross beam. Detailed implementation manners

[0044] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles defined in the following description can be applied to other implementation schemes, variation schemes, improvement schemes, equivalent schemes, and other technical schemes that do not depart from the spirit and scope of the present invention.

[0045] Those skilled in the art should understand that in the disclosure of the present invention, the orientation or positional relationship indicated by terms such as "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention 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. Therefore, the above terms should not be construed as limiting the present invention.

[0046] It can be understood that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of the element can be multiple. The term "a" should not be construed as limiting the quantity.

[0047] As Figures 1 to 19 shown is a simple and quick-release device for a ground wheel disclosed by the present invention, which includes an outer sleeve 1, a pin sleeve 2, and a pin shaft 9.

[0048] As Figure 1 、 2 shown, the outer sleeve 1 is fixedly arranged on the vehicle. The outer sleeve 1 is a sleeve. In this example, two outer sleeves 1 are arranged on the bottom cross beam 26 of the front frame 23, and the lower segments of the two side rods 25 of the rear frame 24 are respectively used as an outer sleeve 1.

[0049] Of course, it can also be other structures. For example, the outer sleeve 1 is arranged on the bottom cross beam 26 of the rear frame 24, or for example, the lower segment of the side rod 25 of the front frame 23 of the folding bicycle is used as the outer sleeve 1.

[0050] The described pin sleeve 2 is made of plastic, preferably integrally formed by plastic, so as to facilitate production and manufacturing while obtaining the plastic elastic part 6, that is, the elasticity of the elastic part 6 is provided by the plastic material. The outer sleeve 1 is axially sleeved with the pin sleeve 2. The pin sleeve 2 is axially provided with a through hole 3. The two ends of the through hole 3 are respectively an insertion end and an outlet end from bottom to top. A moving part 4 is horizontally arranged at the outlet end. The moving part 4 is horizontally eccentrically provided with a socket hole 5 relative to the through hole 3. The moving part 4 is integrally formed with the pin sleeve 2 and is connected by an elastic part 6; the outer sleeve 1 is provided with a window 7. The pressing part 8 of the moving part 4 protrudes outward from the window 7 in the initial state to expose the pressing part 8. When the pressing part 8 is pressed / released, the socket hole 5 and the through hole 3 switch between concentric / eccentric positions, and the elastic part 6 accumulates or releases elastic force, thereby unlocking / limiting the following pin shaft 9; The described pin shaft 9 is provided at the top of the wheel fork 11 of the ground wheel 10. The through hole 3 is detachably sleeved and fitted with the pin shaft 9. An insertion head 12 is provided at the top of the pin shaft 9, and a limiting groove 13 is provided on the lower side of the insertion head 12. The pin shaft 9 is inserted into the through hole 3 from the insertion end through the insertion head 12, and the insertion head 12 extends out from the outlet end and is further inserted into the socket hole 5. A mating surface 14 is provided between the insertion head 12 and the socket hole 5, and this mating surface 14 is provided on the insertion head 12. When the insertion head 12 is inserted into the socket hole 5, the moving part 4 is pushed by this mating surface 14 to make the socket hole 5 move horizontally, and the plastic elastic part 6 accumulates elastic force. When the limiting groove 13 subsequently completely reaches the socket hole 5, the mating surface 14 disengages from the socket hole 5 to make the moving part 4 move back under the action of the plastic elastic part 6. Then, the side wall part 15 in the circumferential direction of the socket hole 5 is snapped into the limiting groove 13 to axially limit the pin shaft 9 to realize quick installation of the ground wheel 10; when unlocking is required, first press the pressing part 8 to make the side wall part 15 withdraw from the limiting groove 13, so that the socket hole 5 is in the unlocking position relative to the limiting groove 13. At this time, the insertion head 12 can be pulled out reversely from the socket hole 5 or fall out by gravity to make the pin shaft 9 disengage from the socket sleeve 2 to realize quick disassembly of the ground wheel 10.

[0051] The socket sleeve 2 is inserted into the outer sleeve 1 and forms a first assembly with the outer sleeve 1.

[0052] When the socket sleeve 2 is axially sleeved on the outer sleeve 1, the socket sleeve 2 is inserted into the outer sleeve 1 from the lower end of the outer sleeve 1. During the insertion process, the inner side wall of the outer sleeve 1 pushes back the pressing part 8 so that the socket sleeve 2 can be inserted into the outer sleeve 1. When the pressing part 8 reaches the window 7, the pressing part 8 extends out of the window 7 under the action of the plastic elastic part 6. In this way, by utilizing the elastic action of the plastic elastic part 6 and the pushing-back action of the inner side wall of the outer sleeve 1, convenient assembly is realized, and at the same time, it is beneficial to quickly realize the socket installation of the outer sleeve 1 and the socket sleeve 2, thereby reducing costs.

[0053] The described socket sleeve 2 is made of high-elasticity and high-hardness engineering plastics, such as polyoxymethylene POM, or polycarbonate PC, or polyetheretherketone PEEK, etc.

[0054] In some embodiments, such as Figure 3 shown, plastic elastic parts 6 are respectively arranged on the left and right sides along the moving direction of the moving part 4. In this way, stable support is provided, and the durability is high during repeated use, which is beneficial to improving reliability.

[0055] Of course, it can also be other structures, for example, as Figure 11 shown, plastic elastic parts 6 are respectively arranged on the front and back sides along the moving direction of the moving part 4.

[0056] Such as Figure 3As shown, one or more plastic elastic parts 6 can be arranged on the left and right sides of the moving part 4, and support parts are formed by inclining towards the pressing part 8. In this example, two are arranged, and a total of four on both the left and right sides.

[0057] And as Figure 11 , 14 shown, one plastic elastic part 6 is respectively arranged on the front and back sides of the moving part 4, and support parts are formed by inclining towards the pressing part 8. Of course, it can also be more than one.

[0058] The inclined formation of the support part is beneficial in that on the one hand, it causes the pressing part 8 of the moving part 4 to protrude outward from the window 7 in the initial state to expose the pressing part 8, and on the other hand, it provides better restoring force and directivity during reset, so it is beneficial to reliability and use comfort.

[0059] In some embodiments, as Figure 3 shown, the part of the pin shaft 9 located in the limit groove 13 is a cylindrical rod 16, and the socket hole 5 is provided with an arc concave surface 17 that cooperates with the cylindrical rod 16. When the socket hole 5 is in the limit position, the arc concave surface 17 is transversely matched with the cylindrical rod 16. This is beneficial to the rotation of the pin shaft 9, and thus beneficial to use in a universal wheel.

[0060] In some embodiments, the lateral peripheral dimensions of the pin sleeve 2 and the moving part 4 are smaller than the lateral inner peripheral dimension of the outer sleeve 1; the cross-section of the pin sleeve 2 and the outer sleeve 1 in socketing fit is a circular or polygonal or D-shaped or elliptical or flat elliptical tubular body. In this way, it is easier to insert the pin sleeve 2 and the moving part 4 into the outer sleeve 1, and the shape of the outer sleeve 1 can be of various structures, such as a circular or polygonal or D-shaped or elliptical or flat elliptical tubular body in cross-section.

[0061] In some embodiments, as Figure 6 shown, the stroke of the pressing part 8 is set such that when the socket hole 5 is in the unlocking position, the pressing part 8 still cooperates with the window 7 to axially limit the pin sleeve 2. In this way, when unlocking and using, the pin sleeve 2 and the outer sleeve 1 are not easily separated from each other.

[0062] Furthermore, as Figure 6 shown, the outer periphery of the outer sleeve 1 is provided with a limit hole 18, and the outer periphery of the pin sleeve 2 is provided with a limit boss 19 at a position corresponding to the limit hole 18. The limit boss 19 is in blocking limit fit with the limit hole 18 to axially limit the outer sleeve 1 and the pin sleeve 2. Among them, in order to be easier to install, the part where the limit boss 19 is located is provided with a transverse through groove or hole 27 or a rectangular slot hole, so as to provide elastic avoidance ability for the limit boss 19 through the transverse through groove or hole 27. In this way, the socketing of the pin sleeve 2 and the outer sleeve 1 with each other is more stable, and it has better durability during long-term use.

[0063] Of course, it can also be other structures, such as Figure 10 As shown, an elastic limiting portion 31 inclined inward is provided on the peripheral portion of the outer sleeve 1, and a mating groove or hole 32 is provided on the outer periphery of the pin sleeve 2 at a position corresponding to the elastic limiting portion 31. The elastic limiting portion 31 is in abutting and limiting cooperation with the mating groove or hole 32 to axially limit the outer sleeve 1 and the pin sleeve 2; or for another example, as Figure 14 shown, it further includes a screw 28. A connection hole 29 is provided on the outer periphery of the pin sleeve 2 at a position corresponding to the limiting hole 18, and the screw 28 is connected through the limiting hole 18 and the connection hole 29 to fix the outer sleeve 1 and the pin sleeve 2.

[0064] Furthermore, as Figure 3 、 4 、5, and 6 shown, a circumferential protrusion 30 is provided at the lower end of the pin sleeve 2. When the limiting boss 19 is in abutting and limiting cooperation with the limiting hole 18, the circumferential protrusion 30 abuts against the lower end surface of the outer sleeve 1 for axial limiting. In this way, on the one hand, after the outer sleeve 1 and the pin sleeve 2 are sleeved and fixed to each other, they will not become loose, and even during long-term use, they have good axial limiting performance. On the other hand, since the circumferential protrusion 30 forms a complete ring, it realizes the closing effect on the lower end of the outer sleeve 1, thereby preventing dirt from entering.

[0065] Similarly, as Figure 7 、 8 、9, and 10 shown, when the elastic limiting portion 31 is in abutting and limiting cooperation with the mating groove or hole 32, the circumferential protrusion 30 abuts against the lower end surface of the outer sleeve 1 for axial limiting; as Figure 11 、 12 、13, and 14 shown, when the screw 28 is connected through the limiting hole 18 and the connection hole 29 to fix the outer sleeve 1 and the pin sleeve 2, the circumferential protrusion 30 abuts against the lower end surface of the outer sleeve 1 for axial limiting.

[0066] In some embodiments, as Figure 6 shown, the insertion head 12 is set as a cone or a frustum of a cone, and the side surface of the cone or the side surface of the frustum of the cone serves as the mating surface 14. In this way, it is beneficial for the pin shaft 9 to insert into the socket hole 5 through the insertion head 12 and smoothly push the moving part 4, thereby improving the user experience.

[0067] It can also be other structures, such as Figure 15 、 16 、17, 18, and 19 shown, the insertion head 12 is set as a cylindrical head, and the socket hole 5 is correspondingly provided with an inclined surface 20. The cylindrical head pushes the moving part 4 through the inclined surface 20, so the surface where the cylindrical head contacts the inclined surface 20 serves as the mating surface 14.

[0068] For the case of the inclined surface 20, further, at least more than half of the inner side wall of the socket hole 5 from the lower end of the socket hole 5 upwards is the inclined surface 20, and this inclined surface 20 is arranged in the opposite direction to the pressing portion 8 of the moving portion 4. In this way, when the cylindrical head pushes the moving portion 4 through the inclined surface 20, the moving portion 4 moves a sufficient stroke, so as to ensure that the insertion head 12 can pass through the socket hole 5, and further make the side wall portion 15 snap into the limit groove 13.

[0069] The pin shaft 9 and the pin sleeve 2 are set to a rotatable mating relationship or a non-rotatable fixed mating relationship. In this way, the setting of the universal wheel 21 can be realized corresponding to the rotatable mating relationship, and the setting of the fixed wheel 22 can be realized corresponding to the non-rotatable fixed mating relationship.

[0070] The rotatable mating relationship is a socket mating relationship with a circular cross-section, and the non-rotatable fixed mating relationship is a socket mating relationship with a polygonal or D-shaped or elliptical or flat elliptical cross-section, or can also be a mating relationship limited by one or more key grooves.

[0071] The present disclosure also proposes a folding vehicle, including four ground wheels 10. The four ground wheels 10 are provided with the above-mentioned ground wheel quick-release device and are arranged as the front two universal wheels 21 and the rear two fixed wheels 22, or the rear two universal wheels 21 and the front two fixed wheels 22, or the front two universal wheels 21 and the rear two universal wheels 21 in these three arrangement modes; the pin of the ground wheel quick-release device of the universal wheel 21 is a cylinder and is rotationally matched with the pin sleeve 2, and the pin shaft 9 of the ground wheel quick-release device of the fixed wheel 22 is fixedly inserted and matched with the pin sleeve 2.

[0072] As Figure 1 shown, in this example, two outer sleeves 1 are arranged on the bottom cross beam 26 of the front frame 23, and the pin shaft 9 and the pin sleeve 2 are set to a rotatable mating relationship, so as to realize the setting of the front two universal wheels 21 on the bottom cross beam 26. The lower sections of the two side rods 25 of the rear frame 24 are respectively used as an outer sleeve 1, and the pin shaft 9 and the pin sleeve 2 are set to a non-rotatable fixed mating relationship, so as to realize the setting of the rear two fixed wheels 22 on the lower sections of the two side rods 25 of the rear frame 24.

[0073] The lower end of the pin shaft 9 is vertically and fixedly arranged in the middle of the cross shoulder of the wheel fork 11, so that it has better mechanical support performance.

[0074] A folding vehicle is also proposed, including six ground wheels 10, and the arrangement modes are the front two universal wheels 21, the middle fixed wheel 22, the rear two fixed wheels, or the rear two universal wheels 21, the middle fixed wheel 22, the front two fixed wheels 22, or the front two universal wheels 21, the middle fixed wheel 22, the rear two universal wheels 21 in these three arrangement modes. The first component can be arranged on the middle bottom cross beam 33 of the frame of the folding vehicle to quickly disassemble / assemble the middle fixed wheel 22. The middle fixed wheel 22 can adopt such asFigure 20 For the structure of the rear two-directional wheels 22 shown, the wheel diameter can be adaptively reduced as needed. Figure 20 In the middle, the middle directional wheel 22 is removed and not installed, and the first component is arranged on the lower side of the middle bottom cross beam 33.

[0075] When understanding the present invention, if necessary, the above structure can refer to other embodiments / attachments Figure 1 and be understood, and will not be elaborated here.

[0076] The above are only optional specific embodiments of the present invention. Any equivalent changes or modifications made to the structure, features, and principles described in the scope of the present patent application are included in the scope of the present patent application.

Claims

1. A simple quick-release device for a ground wheel, characterized in that: include, An outer sleeve (1) is fixedly arranged on the vehicle; The pin sleeve (2) is made of plastic. The outer sleeve (1) is axially sleeved with the pin sleeve (2). The pin sleeve (2) is axially provided with a through hole (3). The two ends of the through hole (3) are respectively an insertion end and an outlet end from bottom to top. A movable part (4) is transversely provided at the outlet end. The movable part (4) is provided with a sleeve hole (5) transversely eccentrically relative to the through hole (3). The movable part (4) is integrally formed with the pin sleeve (2) and connected via an elastic part (6). The outer sleeve (1) is provided with a window (7). The pressing part (8) of the movable part (4) protrudes outward from the window (7) in an initial state to expose the pressing part (8). When the pressing part (8) is pressed / released, the sleeve hole (5) and the through hole (3) switch between a concentric / eccentric position, and the elastic part (6) accumulates or releases elastic force, thereby unlocking / limiting the pin shaft (9). A pin shaft (9) is arranged at the top of a wheel fork (11) of a ground wheel (10); a through hole (3) and the pin shaft (9) are detachably sleeved together; an insertion head (12) is arranged at the top of the pin shaft (9); a limiting groove (13) is arranged at the lower side of the insertion head (12); the pin shaft (9) is inserted into the through hole (3) from the insertion end, and the insertion head (12) extends from the outlet end and is further inserted into the sleeve hole (5); a matching surface (14) is arranged between the insertion head (12) and the sleeve hole (5); the matching surface (14) is arranged on the insertion head (12); when the insertion head (12) is inserted into the sleeve hole (5), the moving part (4) is pushed by the matching surface (14) so ​​that the sleeve The connecting hole (5) moves laterally, and the elastic part (6) accumulates elastic force. When the limiting groove (13) subsequently completely reaches the sleeve hole (5), the matching surface (14) is separated from the sleeve hole (5) so that the movable part (4) moves back under the action of the elastic part (6). The circumferential side wall part (15) of the sleeve hole (5) is inserted into the limiting groove (13) to axially limit the pin shaft (9) to realize the quick installation of the ground wheel (10); when the sleeve hole (5) is in the unlocking position, the side wall part (15) exits the limiting groove (13), and the insertion head (12) can be pulled out of the sleeve hole (5) in the reverse direction or fall out by gravity to make the pin shaft (9) separate from the pin sleeve (2) to quickly release the ground wheel (10).

2. The ground wheel quick release device according to claim 1, characterized in that: Plastic elastic parts (6) are respectively arranged on the left and right sides or the front and rear sides along the moving direction of the moving part (4).

3. The ground wheel quick release device according to claim 1 or 2, characterized in that: The pin sleeve (2) is made of high-elasticity and high-hardness engineering plastic.

4. The ground wheel quick release device according to claim 2, characterized in that: The plastic elastic part (6) is provided at one or more sides respectively on the left and right sides of the movable part (4), and is inclined toward the pressing part (8) to form a supporting part, or the plastic elastic part (6) is provided at one or more sides respectively on the front and rear sides of the movable part (4), and is inclined toward the pressing part (8) to form a supporting part.

5. The ground wheel quick release device according to claim 1, characterized in that: The portion of the pin shaft (9) located in the limiting groove (13) is a cylindrical rod (16), and the sleeve hole (5) is provided with an arc concave surface (17) that matches with the cylindrical rod (16). When the sleeve hole (5) is in the limiting position, the arc concave surface (17) and the cylindrical rod (16) are laterally matched.

6. The ground wheel simple quick release device according to claim 1, characterized in that: The transverse circumference of the pin sleeve (2) and the movable part (4) is smaller than the transverse inner circumference of the outer sleeve (1); the cross-section of the pin sleeve (2) and the outer sleeve (1) when sleeved together is a circular, polygonal, D-shaped, elliptical or flat elliptical tubular body.

7. The ground wheel quick release device according to claim 1 or 6, characterized in that: When the pin sleeve (2) is axially sleeved on the outer sleeve (1), the pin sleeve (2) is inserted into the outer sleeve (1) from the lower end of the outer sleeve (1). During the insertion process, the inner side wall of the outer sleeve (1) pushes back the pressing portion (8) so that the pin sleeve (2) can be inserted into the outer sleeve (1). When the pressing portion (8) reaches the window (7), the pressing portion (8) extends out of the window (7) under the action of the elastic portion (6).

8. The ground wheel simple quick release device according to claim 1, characterized in that: The stroke of the pressing portion (8) is set such that when the sleeve hole (5) is in the unlocking position, the pressing portion (8) still cooperates with the window (7) to form an axial limit pin sleeve (2).

9. The ground wheel simple quick release device according to claim 1 or 8, characterized in that: The outer sleeve (1) is provided with a limiting hole (18) on its periphery, and a limiting boss (19) is provided on its periphery at a position corresponding to the limiting hole (18), and the limiting boss (19) is engaged and limited with the limiting hole (18); and / or the outer sleeve (1) is provided with an elastic limiting portion (31) inclined inwardly on its periphery, and a matching groove or hole (32) is provided on its periphery at a position corresponding to the elastic limiting portion (31), and the elastic limiting portion (31) is engaged and limited with the matching groove or hole (32); and / or it also includes a screw (28), and a connecting hole (29) is provided on its periphery at a position corresponding to the limiting hole (18), and the screw (28) is connected to the connecting hole (29) through the limiting hole (18) to fix the outer sleeve (1) and the pin sleeve (2).

10. The ground wheel simple quick release device according to claim 9, characterized in that: A circumferential protrusion (30) is provided at the lower end of the pin sleeve (2). When the limiting boss (19) and the limiting hole (18) are engaged and limited, the circumferential protrusion (30) is in contact with the lower end surface of the outer sleeve (1) for axial limiting. When the elastic limiting portion (31) and the matching groove or hole (32) are engaged and limited, the circumferential protrusion (30) is in contact with the lower end surface of the outer sleeve (1) for axial limiting. When the screw (28) is connected with the connecting hole (29) through the limiting hole (18) to fix the outer sleeve (1) and the pin sleeve (2), the circumferential protrusion (30) is in contact with the lower end surface of the outer sleeve (1) for axial limiting.

11. The ground wheel simple quick release device according to claim 1, characterized in that: The insertion head (12) is configured as a conical, truncated cone or cylindrical head, and the side surface of the cone or the side surface of the truncated cone serves as the mating surface (14). In the case of a cylindrical head, the sleeve hole (5) is correspondingly provided with an inclined surface (20), and the cylindrical head pushes the moving part (4) via the inclined surface (20).

12. The ground wheel simple quick release device according to claim 11, characterized in that: At least half of the inner wall of the sleeve hole (5) from the lower end of the sleeve hole (5) upward is an inclined surface (20), and the inclined surface (20) is arranged in the opposite direction to the pressing part (8) of the moving part (4).

13. The ground wheel simple quick release device according to claim 1, characterized in that: The pin shaft (9) and the pin sleeve (2) are set in a rotatable matching relationship or a non-rotatable fixed matching relationship.

14. The ground wheel simple quick release device according to claim 13, characterized in that: The rotatable fitting relationship is a socket fitting relationship with a circular cross section, and the non-rotatable fixed fitting relationship is a socket fitting relationship with a polygonal, D-shaped, elliptical or flat elliptical cross section or a fitting relationship limited by one or more keyways.

15. The ground wheel simple quick release device according to claim 1 or 13, characterized in that: The lower end of the pin shaft (9) is vertically fixedly arranged at the middle of the horizontal shoulder of the wheel fork (11).

16. A folding bicycle comprising four or six ground wheels (10), characterized in that: A ground wheel quick-release device according to any one of claims 1 to 15 is provided between the ground wheel (10) and the frame of the folding bicycle. When four ground wheels (10) are provided, the arrangement is three arrangements: two front universal wheels (21), two rear fixed wheels (22), or two rear universal wheels (21), two front fixed wheels (22), or two front universal wheels (21), two rear universal wheels (21); when six ground wheels (10) are provided, the arrangement is three arrangements: two front universal wheels (21), The invention discloses a plurality of arrangements of the present invention, wherein the middle fixed wheel (22), the two rear fixed wheels, or the two rear universal wheels (21), the middle fixed wheel (22), the two front fixed wheels (22), or the two front universal wheels (21), the middle fixed wheel (22), and the two rear universal wheels (21); the shaft pin of the ground wheel simple quick release device corresponding to the universal wheel (21) is a cylinder, which is rotatably matched with the pin sleeve (2); the shaft pin (9) of the ground wheel simple quick release device corresponding to the fixed wheel (2) is plug-connected and fixedly matched with the pin sleeve (2).

17. The folding bicycle according to claim 16, characterized in that: The lower section of the side rod (25) of the front frame (23) and / or the middle frame (33) and / or the rear frame (24) of the folding bicycle serves as the outer sleeve (1).

18. The folding bicycle according to claim 16 or 17, characterized in that: An outer sleeve (1) is provided on the bottom cross beam (26) of the front frame (23) and / or the bottom cross beam (26) of the rear frame (24).

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