Wheel structure of bicycle with push-pull device

Abstract

The utility model relates to a wheel structure of a bicycle with a push-pull device. The wheel structure comprises a wheel mounting piece, a wheel assembly and a pedal assembly, the wheel mounting piece comprises a wheel shaft and a vehicle body connecting end connected with a vehicle body, and the vehicle body comprises a push-pull device; the wheel shaft is provided with a wheel driving groove, the wheel assembly comprises a wheel shaft connecting piece and a wheel body provided with a wheel shaft hole, the wheel shaft is inserted into the wheel shaft hole in an attached mode, and the wheel shaft connecting piece is in linear sliding connection with the wheel body and can be pulled out and inserted into the wheel driving groove. The pedal assembly comprises a wheel shaft connecting end, and the wheel shaft connecting end is connected with the end of the wheel shaft. The bicycle has the advantages that the bicycle can be used as a bicycle or a cart, when the bicycle is used as the cart, the bicycle cannot move due to the fact that the feet of children and the like step on the pedals, the feet and other parts of the children and the like cannot be forcibly pressed along with rotation of the wheel bodies, and safety is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the wheel structure of pedal cycle with push -and -pull device. BACKGROUND

[0002] The front wheel of the pedal cycle will drive the pedal to rotate when the pedal cycle is moved by the push -and -pull device, and the pedal will forcibly compress and hit the feet of children and the like, so the safety is low. In addition, sometimes when children and the like sit on the pedal cycle and pedal with their feet, the pedal cycle needs to be kept stationary to ensure safety, but the conventional pedal cycle cannot realize this function. SUMMARY

[0003] One purpose of the utility model is to solve or alleviate the above technical problems.

[0004] The utility model adopts the means that the wheel structure of pedal cycle with push -and -pull device, it includes wheel mounting piece, wheel assembly and pedal assembly;Wheel mounting piece includes wheel shaft and the vehicle body connecting end for being connected with vehicle body, and the vehicle body includes push -and -pull device;The wheel shaft is provided with wheel drive groove, and the wheel assembly includes wheel shaft connecting piece and the wheel body provided with wheel shaft hole, and the wheel shaft is inserted into the wheel shaft hole in place, and the wheel shaft connecting piece is linearly slidably connected with the wheel body and can be extracted and inserted into the wheel drive groove;The pedal assembly includes the wheel shaft connecting end, and the wheel shaft connecting end is connected with the end of the wheel shaft.

[0005] The utility model reaches the effect that it can be used as a pedal cycle or a cart, and when used as a cart, it will not move due to the feet of children stepping on the pedal plate, and it will not forcibly compress the feet of children and the like due to the rotation of the wheel body, so it is relatively safe.

[0006] Further technical solutions, the wheel shaft connecting piece includes a linear slider, a latch and a wheel shaft elastic element;The wheel body is provided with a linear structure, the linear slider is linearly slidably connected with the linear structure, the latch is linearly slidably connected with the linear slider, and the wheel shaft elastic element is connected with the latch and the linear slider respectively so that the latch has a tendency to approach the axis of the wheel shaft, and the latch can be extracted and inserted into the wheel drive groove.

[0007] Without confirming the rotation angle of the wheel body and the wheel shaft, it can be converted from the unlocked state to the locked state, which is convenient to operate.

[0008] Further technical solutions, the wheel assembly further includes a wheel operating element hinged to the wheel body, and the wheel operating element is provided with a rotary output end, and the linear slider is provided with a transmission body drivingly connected with the rotary output end.

[0009] The position of the wheel operating element away from the axis of the wheel body is fixed, which is convenient to operate.

[0010] Further technical solutions, the transmission body is a rack, and the rotary output end is a tooth on a gear and is engaged with the transmission body.

[0011] The stability of the transmission between the transmission body and the rotating output end can be ensured.

[0012] Further, the wheel body is provided with a limiting groove parallel to the axis of the wheel body, the linear slide is provided with a limiting body inserted into the limiting groove, the wheel body is provided with a wheel operating member groove, and the wheel operating member groove is provided with a hinge groove with the same center; the wheel operating member is in the shape of a cylinder and is embedded in the wheel operating member groove, and / or the wheel operating member is provided with a cylindrical hinge body embedded in the hinge groove.

[0013] The stroke of the linear slide can be limited, and the linear slide and the wheel operating member can be assembled by moving along the axis of the wheel body, which is convenient.

[0014] Further, the wheel body and the wheel operating member are both provided with a limiting projection with elasticity, the limiting projection of the wheel body is in abutment with the limiting projection of the wheel operating member; and / or the wheel body and the wheel shaft connecting member are both provided with a limiting projection, the limiting projection of the wheel body is in abutment with the limiting projection of the wheel shaft connecting member.

[0015] When the wheel operating member is rotated, the feedback feeling of the locking position and the unlocking position can be realized, and the stability of the locking state and the unlocking state can be ensured.

[0016] Further, the wheel assembly further comprises a wheel side cover, the wheel side cover is fixedly connected with the wheel body; at least one of the wheel side covers is provided with an exposed opening, the wheel operating member is exposed from the exposed opening, the wheel operating member is provided with an anti-falling body, and the anti-falling body is in abutment with the inner wall of the wheel side cover.

[0017] The wheel operating member can be prevented from falling off.

[0018] Further, the wheel shaft connecting end is provided with a wheel shaft connecting groove, the wheel shaft is in the shape of a profile and is provided with a pedal connecting body embedded in the wheel shaft connecting groove, and the wheel shaft connecting end is embedded in the wheel shaft.

[0019] The universality is high.

[0020] Further, the recess of the pedal connecting body is filled with a filler, so that the side wall of the wheel shaft is in the shape of a cylinder; or the width of the recess of the pedal connecting body is smaller than the diameter of the bolt.

[0021] The bolt can be prevented from being inserted into the recess of the pedal connecting body.

[0022] Further, the wheel assembly further comprises a locking elastic member and a locking member provided with a locking body, the wheel shaft is provided with a pedal locking groove, the locking body is inserted into the pedal locking groove; the pedal assembly is provided with a locking member groove, the locking member is inserted into the locking member groove and can move along the locking member groove; the locking elastic member is in abutment with the locking member and the pedal assembly at both ends, so that the locking body has a tendency to approach the pedal locking groove.

[0023] The pedal assembly can be conveniently disassembled and installed. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a perspective view of a bicycle according to an embodiment of the present application.

[0025] Figure 2 is a perspective exploded view of a wheel structure of a bicycle with a push-pull device according to an embodiment of the present application.

[0026] Figure 3 is a perspective exploded view of a wheel assembly 2 according to an embodiment of the present application.

[0027] Figure 4 is a perspective view of a wheel axle connecting piece 22 and a wheel operating piece 23 according to an embodiment of the present application.

[0028] Figure 5 is a schematic view of a pedal assembly 3 according to an embodiment of the present application.

[0029] Figure 6 is a perspective half-section view of a wheel axle 12 according to an embodiment of the present application.

[0030] Figure 7 is a schematic view of a section one SEC1.

[0031] Figure 8 is a schematic view of a section two SEC2.

[0032] Figure 9 is Figure 8 a partially enlarged schematic view.

[0033] The drawing of the specification that best illustrates the technical features of the present application is Figure 8 .

[0034] Profile one SEC1; profile two SEC2; wheel mounting 1; wheel axle 12; foot pedal connecting body 121; wheel driving groove 122; foot pedal locking groove 123; mounting fork 18; wheel axle mounting end 181; wheel axle mounting 182; bearing 183; vehicle body connecting end 19; wheel assembly 2; wheel body 21; wheel axle hole 211; straight line structure 212; limiting groove 213; wheel operating member groove 214; hinged groove 218; wheel axle connecting member 22; straight line sliding block 221; bolt 222; wheel axle elastic member 223; transmission body 224; limiting body 225; wheel operating member 23; rotary output end 231; anti-falling body 232; hinged body 238; operating part 239; gear protrusion 24; wheel side cover 29; exposed opening 293; foot pedal assembly 3; wheel axle connecting end 31; wheel axle connecting groove 311; locking member groove 312; locking member limiting hole 313; locking member 32; locking body 321; locking elastic member 322; foot pedal plate 39; vehicle body 9; rear wheel 91; push-pull device 92. DETAILED DESCRIPTION

[0035] The specific embodiments of the utility model will be described below with reference to the accompanying drawings.

[0036] As a specific embodiment, the wheel structure of the scooter with a push-pull device according to the embodiments of the utility model comprises a wheel mounting 1, a wheel assembly 2 and a foot pedal assembly 3.

[0037] The wheel mounting 1 comprises a wheel axle 12 and a vehicle body connecting end 19 for connecting with a vehicle body 9, and the vehicle body 9 comprises a push-pull device 92. For example, the wheel mounting 1 comprises a mounting fork 18 in the shape of Y as a whole, and the three end heads of the mounting fork 18 are respectively the vehicle body connecting end 19, a wheel axle mounting end 181 and a wheel axle mounting end 181, wherein two wheel axle mounting ends 181 are respectively connected with wheel axle mountings 182, the wheel axle mountings 182 are provided with bearings 183, and the wheel axle 12 passes through the bearings 183 so that the wheel axle 12 can rotate relative to the wheel axle mountings 182 and the vehicle body connecting end 19. Generally, the vehicle body 9 is provided with a rear wheel 91, the vehicle body connecting end 19 is connected with the vehicle body 9, and a handlebar (not marked in the drawing) is installed, so that the wheel structure of the scooter with a push-pull device according to the embodiments of the utility model can be used as a front wheel of the scooter, but it does not mean that the wheel structure of the scooter with a push-pull device according to the embodiments of the utility model can only be used as a front wheel. Generally, the push-pull device 92 can be telescopic when it is a push rod, so as to adapt to different use scenarios; of course, the push-pull device 92 can also be a pull rod or a pull rope, etc.

[0038] The wheel axle 12 is provided with a wheel driving groove 122, the wheel assembly 2 comprises a wheel axle connecting piece 22 and a wheel body 21 provided with a wheel axle hole 211, the wheel axle 12 is inserted into the wheel axle hole 211 in a fit manner, the cross section of the wheel axle 12 and the cross section of the wheel axle hole 211 are both circular in shape, so that the wheel body 21 can rotate relative to the wheel axle 12. The wheel axle connecting piece 22 is linearly slidingly connected with the wheel body 21 and can be pulled out of or inserted into the wheel driving groove 122.

[0039] The pedal assembly 3 comprises a wheel axle connecting end 31 connected with the end of the wheel axle 12. It is easily understood that the pedal assembly 3 generally comprises a pedal plate 39, and the pedal of a child or the like pedals the pedal plate 39 to make the wheel axle 12 rotate.

[0040] The working principle is that the wheel axle connecting piece 22 is linearly slid to be inserted into the wheel driving groove 122, the wheel body 21 cannot rotate relative to the wheel axle 12, and is in a locked rotation state, at this time, the pedal (such as the pedal of a child) of the pedal plate 39 can drive the wheel body 21 to rotate through the wheel axle 12, so that the bicycle moves, and the bicycle can be used. It is easily understood that when the bicycle is in the locked rotation state, the bicycle body 9 is pushed by the pushing and pulling device 92, and the wheel body 21 rolls to make the pedal plate 39 rotate.

[0041] The wheel axle connecting piece 22 is linearly slid to be pulled out of the wheel driving groove 122, the wheel body 21 can rotate relative to the wheel axle 12, and is in an unlocked state, the pedal of the pedal plate 39 drives the wheel axle 12 to rotate, but cannot drive the wheel body 21 to rotate, and the bicycle remains stationary and will not move due to the pedal of the pedal plate 39 by a child or the like, and is relatively safe. It is easily understood that when the bicycle is in the unlocked state, the bicycle body 9 is pushed by the pushing and pulling device 92 to be used as a stroller, the wheel body 21 rolls, but the pedal plate 39 does not rotate with the wheel body 21 to forcibly press the feet or the like of a child or the like, and is relatively safe.

[0042] As can be seen from the above, the wheel structure of the bicycle with a pushing and pulling device according to the embodiments of the present application can be used as a bicycle or a stroller, and when used as a stroller, will not move due to the pedal of the pedal plate 39 by a child or the like, and will not forcibly press the feet or the like of a child or the like with the rotation of the wheel body 21, and is relatively safe.

[0043] As one of the specific embodiments, the wheel shaft connecting piece 22 comprises a linear slide 221, a bolt 222 and a wheel shaft elastic piece 223; the wheel body 21 is provided with a linear structure 212, the linear slide 221 is linearly slidably connected with the linear structure 212, for example, the linear structure 212 is a sliding groove or a sliding rail and is linearly slidably connected with the linear slide 221, for example, the linear structure 212 is a flat plate and is linearly slidably connected with the linear slide 221 by cooperating with the rack and pinion structure described later. The bolt 222 is linearly slidably connected with the linear slide 221 (for example, the bolt 222 passes through the linear slide 221 in close contact), the wheel shaft elastic piece 223 is connected with the bolt 222 and the linear slide 221 respectively so that the bolt 222 has a tendency to be close to the axis of the wheel shaft 12 (for example, the wheel shaft elastic piece 223 is a spring and the two ends are respectively abutted with the bolt 222 and the linear slide 221), and the bolt 222 can be pulled out of or inserted into the wheel driving groove 122. When changing from the unlocked state to the locked state, the linear slide 221 is moved, so that even if the bolt 222 is not directly opposite the wheel driving groove 122, the bolt 222 will abut against the side wall of the wheel shaft 12 and maintain the tendency to be close to the axis of the wheel shaft 12, until the wheel shaft 12 is rotated relative to the wheel body 21 to the wheel driving groove 122 directly opposite the bolt 222, and the bolt 222 is inserted into the wheel driving groove 122 to change to the locked state. In other words, without confirming the rotation angle of the wheel body 21 and the wheel shaft 12, the unlocked state can be changed to the locked state, which is convenient for operation. It is easy to understand that for changing from the locked state to the unlocked state, the process is similar to the above, which will not be described here.

[0044] As one of the specific embodiments, the wheel assembly 2 further comprises a wheel operating piece 23 hinged with the wheel body 21, the wheel operating piece 23 is provided with a rotary output end 231, and the linear slide 221 is provided with a transmission body 224 drivingly connected with the rotary output end 231. Rotating the wheel operating piece 23, the rotary output end 231 drives the linear slide 221 to linearly slide through the transmission body 224. Compared with the embodiment of directly pulling the linear slide 221 to make it linearly slide, the position of the wheel operating piece 23 away from the axis of the wheel body 21 is fixed, and the operation will not be interfered by the cylindrical protrusion (not marked in the figure) on the wheel side cover 29 described later, which is convenient for operation.

[0045] As one of the specific embodiments, the transmission body 224 is a rack, and the rotary output end 231 is a tooth on a gear and is engaged with the transmission body 224. The stability of the transmission between the transmission body 224 and the rotary output end 231 can be ensured.

[0046] As one of the specific embodiments, the wheel body 21 is provided with a limiting groove 213 parallel to the axis of the wheel body 21, the linear slide 221 is provided with a limiting body 225 inserted into the limiting groove 213, the wheel body 21 is provided with a wheel operating member groove 214, and the wheel operating member groove 214 is provided with a hinge groove 218 with the same center; the wheel operating member 23 is in the shape of a cylinder and is embedded in the wheel operating member groove 214, and / or the wheel operating member 23 is provided with a cylindrical hinge body 238 embedded in the hinge groove 218, so that the wheel operating member 23 is hinged with the wheel body 21. The stroke of the linear slide 221 can be limited, and the linear slide 221 (provided with the pin 222 and the wheel shaft elastic member 223) and the wheel operating member 23 can be moved along the axis of the wheel body 21, so that the assembly of the linear slide 221 and the wheel operating member 23 is convenient. Of course, a jack screw can be arranged at one end of the limiting body 225, or the linear slide 221 can be prevented from separating from the linear structure 212 by the anti-dropping body 232.

[0047] As one of the specific embodiments, the wheel body 21 and the wheel operating member 23 are both provided with a stop protrusion 24 with elasticity (for example, the stop protrusion 24 is integrally injection molded with the wheel body 21, so that the stop protrusion 24 has elasticity), the stop protrusion 24 of the wheel body 21 is in abutment with the stop protrusion 24 of the wheel operating member 23; and / or the wheel body 21 and the wheel shaft connecting member 22 are both provided with the stop protrusion 24, the stop protrusion 24 of the wheel body 21 is in abutment with the stop protrusion 24 of the wheel shaft connecting member 22, for example, the stop protrusion 24 of the wheel body 21 is arranged on the linear structure 212, and the stop protrusion 24 of the wheel shaft connecting member 22 is arranged on the side wall of the linear slide 221 (the embodiment is not shown in the drawing). When the wheel operating member 23 is rotated, the feedback feeling of the locking stop and the unlocking stop can be realized, and the stability of the locking state and the unlocking state can be ensured.

[0048] As one of the specific embodiments, the wheel assembly 2 further comprises a wheel side cover 29, the wheel side cover 29 is fixedly connected with the wheel body 21, for example, the wheel side cover 29 is fixedly connected with the wheel body 21 through buckling; at least one of the wheel side cover 29 is provided with an exposed opening 293, the wheel operating member 23 is exposed from the exposed opening 293, the wheel operating member 23 is provided with an anti-dropping body 232, the anti-dropping body 232 is in abutment with the inner wall of the wheel side cover 29, of course, the anti-dropping body 232 can not be arranged, but a jack screw is screwed into the hinge body 238 to prevent the wheel operating member 23 from falling off. The wheel operating member 23 can be prevented from falling off. Usually, the wheel operating member 23 is provided with an operating part 239 for easy operation, and the operating part 239 can be a flat plate, a handle or an operating hole, etc.

[0049] As one of the specific embodiments, the wheel shaft connecting end 31 is provided with a wheel shaft connecting groove 311, the wheel shaft 12 is profiled and provided with a pedal connecting body 121 embedded in the wheel shaft connecting groove 311, and the wheel shaft connecting end 31 is embedded in the wheel shaft 12, so that the wheel shaft connecting end 31 is detachably connected with the end of the wheel shaft 12. After the pedal assembly 3 is detached, the wheel structure of the bicycle with a pushing and pulling device in the embodiment of the utility model can be used as a stroller alone, and the universality is higher.

[0050] As one of the specific embodiments, the recess of the pedal connecting body 121 is filled with a filler (not shown in the drawings), so that the side wall of the wheel shaft 12 is a cylindrical surface. For example, the filler is a plastic part embedded in the pedal connecting body 121 or the like. Alternatively, the width of the recess of the pedal connecting body 121 is smaller than the diameter of the bolt 222. The bolt 222 can be prevented from being inserted into the recess of the pedal connecting body 121.

[0051] As one of the specific embodiments, the locking elastic member 322 and the locking member 32 provided with the locking body 321 are further included, the wheel shaft 12 is provided with a pedal locking groove 123, the locking body 321 is inserted into the pedal locking groove 123; the pedal assembly 3 is provided with a locking member groove 312, the locking member 32 is inserted into the locking member groove 312 and can move along the locking member groove 312; the locking elastic member 322 has a tendency to approach the pedal locking groove 123 by abutting the locking member 32 and the pedal assembly 3 at both ends. The pedal assembly 3 is provided with a locking member limiting hole 313, and a screw passes through the locking member limiting hole 313 and the locking member 32 to prevent the locking member 32 from falling off. The pedal assembly 3 can be conveniently detached and installed.

[0052] As used in the present utility model, the terms "first", "second", etc. do not indicate any order, quantity or importance, but are used for differentiation only.

[0053] As used in the present utility model, the terms "one", "a", etc. do not indicate a limitation in quantity, but indicate the existence of at least one mentioned object.

[0054] As used in the present utility model, the terms indicating direction or position, such as "top", "bottom", "side", "longitudinal", "transverse", "middle", "center", "outer", "inner", "horizontal", "vertical", "left", "right", "upper", "lower", etc., mean reflecting relative position, not absolute position.

[0055] As used in the present utility model, the terms "approximately", "entirely", "approximately", "similarly", etc. are used as limiting terms indicating the existence of characteristics but allowing certain deviations. The amount of the allowed deviation can vary depending on the specific context; for example, the deviation in size can depend on the specific context, including but not limited to the relevant standards for dimensional tolerance.

Claims

1. A wheel structure of a bicycle with a push-pull device, comprising a wheel mounting (1), a wheel assembly (2) and a pedal assembly (3); the wheel mounting (1) comprises a wheel shaft (12) and a vehicle body connecting end (19) for connecting with a vehicle body (9), the vehicle body (9) comprises a push-pull device (92); the wheel shaft (12) is provided with a wheel driving groove (122), the wheel assembly (2) comprises a wheel shaft connecting piece (22) and a wheel body (21) provided with a wheel shaft hole (211), the wheel shaft (12) is inserted into the wheel shaft hole (211) in a fitting manner, and the wheel shaft connecting piece (22) is in linear sliding connection with the wheel body (21) and can be pulled out of and inserted into the wheel driving groove (122); the pedal assembly (3) comprises a wheel shaft connecting end (31), and the wheel shaft connecting end (31) is connected with an end of the wheel shaft (12). characterized in that The wheel shaft connecting piece (22) comprises a linear sliding block (221), a latch (222) and a wheel shaft elastic piece (223); the wheel body (21) is provided with a linear structure (212), the linear sliding block (221) is in linear sliding connection with the linear structure (212), the latch (222) is in linear sliding connection with the linear sliding block (221), and the wheel shaft elastic piece (223) is connected with the latch (222) and the linear sliding block (221) respectively so that the latch (222) has a tendency to be close to an axis of the wheel shaft (12), and the latch (222) can be pulled out of and inserted into the wheel driving groove (122).

2. A wheel structure for a pedal cycle incorporating a push-pull device as claimed in claim 1, characterised in that, The wheel assembly (2) further comprises a wheel operating piece (23) hinged with the wheel body (21), and the wheel operating piece (23) is provided with a rotary output end (231); the linear sliding block (221) is provided with a transmission body (224) in driving connection with the rotary output end (231).

3. The wheel structure of a pedal cycle with push-pull device according to claim 1, characterized in that, The transmission body (224) is a rack, and the rotary output end (231) is a tooth on a gear and is in mesh with the transmission body (224).

4. A wheel structure for a pedal cycle incorporating a push-pull device as claimed in claim 3, characterised in that, The wheel body (21) is provided with a limiting groove (213) parallel to an axis of the wheel body (21), the linear sliding block (221) is provided with a limiting body (225) inserted into the limiting groove (213), the wheel body (21) is provided with a wheel operating piece groove (214), and the wheel operating piece groove (214) is provided with a hinging groove (218) with the same center; the wheel operating piece (23) is in the form of a cylinder and is embedded in the wheel operating piece groove (214), and / or the wheel operating piece (23) is provided with a hinging body (238) in the form of a cylinder, and the hinging body (238) is embedded in the hinging groove (218).

5. A wheel structure for a pedal cycle incorporating a push-pull device as claimed in claim 4, characterised in that, The wheel body (21) and the wheel operating piece (23) are both provided with a gear position protrusion (24) with elasticity, the gear position protrusion (24) of the wheel body (21) is in abutment with the gear position protrusion (24) of the wheel operating piece (23); and / or the wheel body (21) and the wheel shaft connecting piece (22) are both provided with the gear position protrusion (24), and the gear position protrusion (24) of the wheel body (21) is in abutment with the gear position protrusion (24) of the wheel shaft connecting piece (22).

6. The wheel structure of a pedal cycle with push-pull device according to claim 3, characterized in that, ​ 7. A wheel structure for a pedal cycle having a push-pull device according to claim 5, characterized in that, The wheel assembly (2) further comprises wheel side covers (29) fixedly connected with the wheel bodies (21); at least one of the wheel side covers (29) is provided with an exposed opening (293) from which the wheel operating member (23) is exposed, and the wheel operating member (23) is provided with an anti-dropping body (232) abutting against the inner wall of the wheel side cover (29).

8. The wheel structure of a pedal cycle with push-pull device according to claim 1, characterized in that, The wheel shaft connecting end (31) is provided with a wheel shaft connecting groove (311), the wheel shaft (12) is a profiled material and is provided with a pedal connecting body (121) embedded in the wheel shaft connecting groove (311), and the wheel shaft connecting end (31) is embedded in the wheel shaft (12).

9. A wheel structure for a pedal cycle incorporating a push / pull device as claimed in claim 8, characterised in that, The recess of the pedal connecting body (121) is filled with a filler, so that the side wall of the wheel shaft (12) is a cylindrical surface; or the width of the recess of the pedal connecting body (121) is smaller than the diameter of the bolt (222).

10. The wheel structure of a pedal cycle with push-pull means according to claim 8, characterized in that, Further comprising a locking elastic member (322) and a locking member (32) provided with a locking body (321), the wheel shaft (12) is provided with a pedal locking groove (123), the locking body (321) is inserted into the pedal locking groove (123); the pedal assembly (3) is provided with a locking member groove (312), the locking member (32) is inserted into the locking member groove (312) and can move along the locking member groove (312); the locking elastic member (322) abuts against the locking member (32) and the pedal assembly (3) at both ends, so that the locking body (321) has a tendency to approach the pedal locking groove (123).

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