CN115476955B

CN115476955B - Crank quick assembly and quick disassembly structure, pedal assembly and children bicycle

Info

Publication number: CN115476955B
Application number: CN202210727904.9A
Authority: CN
Inventors: 花爱城; 王一雄; 晁志伟; 仝立新
Original assignee: Beijing Youbei Baiqi Technology Co ltd
Current assignee: Beijing Youbei Baiqi Technology Co ltd
Priority date: 2022-06-22
Filing date: 2022-06-22
Publication date: 2024-02-20
Anticipated expiration: 2042-06-22
Also published as: CN115476955A

Abstract

The invention discloses a crank quick-assembly and quick-disassembly structure, a pedal assembly and a children bicycle, and relates to the technical field of children bicycles. The crank quick-assembly and quick-disassembly structure is used for connecting a crank and a main shaft and comprises an adapter and a connecting assembly, wherein the adapter is connected with the main shaft through a locking piece, one end of the crank is provided with a matching cavity extending along the thickness direction of the crank, and the adapter can be penetrated into the matching cavity from one end of the matching cavity; the connecting component is connected with the adapter, and is provided with a locking position and a release position, and in the locking position, the crank is matched with the connecting component to enable the matching cavity to be in locking connection with the adapter; in the release position, the crank is disengaged from the connection assembly such that the crank can be disengaged from the adapter in the axial direction of the adapter. This crank fast-assembling quick detach structure need not to dismantle relevant connection structure when to installation or dismantlement crank operation, can realize the dismouting between crank and the main shaft fast, simple to operate, and the commonality is strong, has improved user experience and has felt and reduced manufacturing cost.

Description

Crank quick assembly and quick disassembly structure, pedal assembly and children bicycle

Technical Field

The invention relates to the technical field of children bicycles, in particular to a crank quick-assembly and quick-disassembly structure, a pedal assembly and a children bicycle.

Background

The bicycle is a common transportation tool, has the advantages of energy conservation, environmental protection and convenient use, and the pedal of the bicycle is a key part of the bicycle capable of walking. The pedal of the bicycle is connected with the main shaft of the bicycle through a crank, and the pedal is connected with the crank through threads. At present, the crank assemblies at two sides of the high-end bicycle in the prior art are connected by pressing the locking screw at the outer end of the crank assemblies with the main shaft, and the structure principle is that the crank is inserted into the main shaft in advance, then the locking screw is rotated in the correct direction to be continuously meshed with the internal thread of the main shaft, so that the crank and the main shaft are fixed together by the pressing force. However, the disassembly and assembly of the crank depend on tools, so that the crank can work safely and reliably and is locked by adopting an installation tool and is strongly installed, and the crank cannot be fixed on a main shaft safely and reliably by manpower under the condition of no tools; meanwhile, the installation is complicated, the strength and the skill are required, and the installation process is not friendly to most women, old people and children; in addition, too many parts are arranged on the outer belt of the bicycle, a customer can obtain a mounting tool and a plurality of locking screws after buying the bicycle, and the parts are special, once the parts are lost, a key bicycle crank cannot be mounted or dismounted, so that a certain use cost is brought to the customer, the manufacturing process of the locking screws and the mounting tool is complex, and certain cost is required for production, processing, transportation and storage of factories, so that the cost is increased.

Disclosure of Invention

The invention aims to provide a crank quick-assembly and quick-disassembly structure, which can quickly realize the assembly and disassembly between a crank and a main shaft, is convenient to install and high in universality, and can improve the user experience and reduce the production and manufacturing cost.

To achieve the purpose, the invention adopts the following technical scheme:

a crank quick-assembly quick-disassembly structure for connecting a crank and a main shaft comprises:

the adapter is connected with the main shaft through a locking piece, one end of the crank is provided with a matching cavity extending along the thickness direction of the crank, and the adapter can penetrate through the matching cavity from one end of the matching cavity;

the connecting component is connected with the adapter; the connecting assembly has a locking position in which the crank is engaged with the connecting assembly to lock the engagement cavity and the adapter in connection; in the release position, the crank is disengaged from the connection assembly such that the crank can be disengaged from the adapter in an axial direction of the adapter.

Optionally, the connecting assembly includes a limiting member, one of an inner wall of the mating cavity and an outer wall of the adapter is provided with the limiting member, the other one of the inner wall of the mating cavity and the outer wall of the adapter is provided with a limiting groove, the limiting member is movable between a locking position and a releasing position along a radial direction of the mating cavity, in the locking position, the limiting member is at least partially mated in the limiting groove, and in the releasing position, the limiting member is separated from the limiting groove.

Optionally, the limiting groove is disposed in the matching cavity, and the limiting piece is disposed on the outer wall of the adaptor.

Optionally, the coupling assembling still includes presses the subassembly, the adaptor is inside to be provided with to hold the chamber, the locating part is followed hold the radial wearing of chamber and locate hold the chamber wall in chamber, press the subassembly set up in hold the intracavity and with the locating part cooperation, press the subassembly can make the locating part follow locking position moves to the release position.

Optionally, the pressing component includes a pressing piece and an elastic piece, one end of the elastic piece is abutted with the pressing piece, the other end of the elastic piece is abutted with the adapting piece, the pressing piece is matched with the limiting piece, in the locking position, the elastic piece is in a stretched state, the limiting piece extends out of the accommodating cavity in the radial direction, and one end part of the pressing piece away from the elastic piece extends out of the accommodating cavity; in the release position, the elastic piece is in a compressed state and the limiting piece is positioned in the accommodating cavity.

Optionally, the pressing piece is provided with a first inclined surface, and the limiting piece is provided with a second inclined surface matched with the first inclined surface;

and/or one end of the limiting piece, which is far away from the pressing piece, is provided with a third inclined surface.

the first inclined surface is provided with a stop groove extending along the length direction of the first inclined surface, the second inclined surface is provided with a stop part, and the stop part is in sliding connection with the stop groove.

Optionally, the stop groove and the stop part are both T-shaped;

or, the stop groove is in a shape of , and the stop part is in an L shape.

the first inclined surface is provided with an adsorption piece along the length direction of the first inclined surface, and the adsorption piece is in adsorption connection with the limiting piece.

Optionally, the crank quick-assembly and quick-disassembly structure further comprises a locking piece, and the adapter piece is connected with the main shaft through the locking piece.

Optionally, the main shaft is provided with connecting portion, the adaptor cover is located connecting portion, the retaining member with connecting portion threaded connection.

The invention further aims to provide the pedal assembly, which can be used for rapidly disassembling and assembling the crank and the main shaft, is simple and convenient to operate, and can be used for improving the user experience and reducing the production and manufacturing cost.

To achieve the purpose, the invention adopts the following technical scheme:

the pedal assembly comprises the crank, the crank quick-assembly and quick-disassembly structure and a pedal, wherein the pedal is connected with one end of the crank, which is far away from the crank quick-assembly and quick-disassembly structure.

Another object of the present invention is to provide a child bicycle that can save installation time and cost of factories and users, and is convenient to store and transport, improving the experience of users.

To achieve the purpose, the invention adopts the following technical scheme:

the children bicycle comprises a main shaft and two pedal assemblies, wherein the two pedal assemblies are respectively connected to two ends of the main shaft.

The invention has the beneficial effects that: the crank quick-assembly and quick-disassembly structure is used for connecting a crank and a main shaft. The adapter is connected with the main shaft, one end of the crank is provided with a matching cavity extending along the thickness direction of the crank, and the adapter can penetrate through the matching cavity from one end of the matching cavity; the connecting component is connected with the adapter, and is provided with a locking position and a release position, and when in the locking position, the crank is matched with the connecting component so as to enable the matching cavity to be in locking connection with the adapter; in the release position, the crank is disengaged from the connection assembly such that the crank can be disengaged from the adapter in the axial direction of the adapter. When the crank is required to be disassembled, the connecting component can be controlled to be in a release position, so that the crank can be separated from the adapter along the axial direction of the adapter, when the crank is required to be installed, the adapter can be inserted into a matching cavity of the crank from the side surface to complete the installation of the crank, and when the crank and the adapter are assembled in place, the connecting component can be controlled to be in a locking position to prevent the crank from being separated.

Drawings

FIG. 1 is a schematic diagram of a crank quick-assembly and quick-disassembly structure according to an embodiment of the present invention;

fig. 2 is a schematic view of a part of a crank quick-assembly and quick-disassembly structure according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of FIG. 2;

fig. 4 is a schematic structural view of a connecting assembly of a crank quick-assembly and quick-disassembly structure in a locking position according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a connecting assembly of a crank quick-assembly and quick-disassembly structure in a release position according to an embodiment of the present invention;

FIG. 6 is a schematic illustration of a connection assembly of a quick-release crank structure according to an embodiment of the present invention in a first configuration between a locked position and a released position;

fig. 7 is a schematic diagram II of a structure of a connecting assembly of a crank quick-assembly and quick-disassembly structure provided by the embodiment of the invention between a locking position and a releasing position;

fig. 8 is a schematic diagram of a structure in which a pressing piece and a limiting piece of a crank quick-assembly and quick-disassembly structure provided by the embodiment of the invention are matched;

fig. 9 is a second schematic structural view of the cooperation of the pressing member and the limiting member of the crank quick-assembly and quick-disassembly structure provided by the embodiment of the invention;

FIG. 10 is a schematic view of a press member and a stopper of a quick-release structure for a crank according to another embodiment of the present invention;

FIG. 11 is a schematic diagram of a foot pedal assembly according to an embodiment of the present invention;

fig. 12 is a schematic diagram of a second structure of the foot pedal assembly according to the embodiment of the present invention.

In the figure:

100-crank; 101-a mating cavity; 102-a limit groove; 200-a main shaft; 201-a connection; 300-foot pedal;

1-an adapter; 11-a receiving cavity; 2-limiting parts; 21-a second inclined surface; 22-a third inclined surface; 3-pressing piece; 23-a stop; 31-a first inclined surface; 32-sliding grooves; 33-a stop groove; 4-elastic members; 5-locking piece; and 6-limiting screws.

Detailed Description

In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.

As shown in fig. 1 to 10, the quick-assembling and quick-disassembling structure of the crank is used for connecting the crank 100 and the main shaft 200, and comprises an adapter 1 and a connecting assembly, wherein the adapter 1 is connected with the main shaft 200 through a locking piece 5, one end of the crank 100 is provided with a matching cavity 101 extending along the thickness direction of the crank, and the adapter 1 can be arranged in the matching cavity 101 from one end of the matching cavity 101 in a penetrating manner; the connecting assembly is connected with the adapter 1, and has a locking position and a release position, wherein in the locking position, the crank 100 is matched with the connecting assembly to enable the matching cavity 101 to be in locking connection with the adapter 1; in the release position, the crank 100 is disengaged from the connection assembly so that the crank 100 can be disengaged from the adapter 1 in the axial direction of the adapter 1. It can be appreciated that when the crank 100 needs to be disassembled, the connecting component can be controlled to be in a release position, so that the crank 100 can be separated from the adapter 1 along the axial direction of the adapter 1, when the crank 100 needs to be installed, the adapter 1 can be inserted into the matching cavity 101 of the crank 100 from the side surface, the installation of the crank 100 is completed, and when the crank 100 and the adapter 1 are assembled in place, the connecting component can be controlled to be in a locking position so as to prevent the crank 100 from being separated, therefore, when the crank 100 is assembled or disassembled, the crank quick assembly and quick disassembly structure does not need to disassemble the related connecting structure, the disassembly and assembly between the crank 100 and the main shaft 200 can be realized quickly, the installation is convenient, the universality is strong, the user experience is improved, and the production and manufacturing cost is reduced.

In this embodiment, the main shaft 200 is already in the prior art, and the specific structure is not described herein, but it is understood that the main shaft 200 should include two parts capable of rotating relatively, wherein the adapter 1 is connected to one part of the main shaft 200, and the crank 100 can drive one part of the main shaft 200 to rotate relative to the other part through the adapter 1.

Alternatively, as shown in fig. 1 to 10, the connection assembly includes a stopper 2, one of the inner wall of the mating cavity 101 and the outer wall of the adapter 1 is provided with the stopper 2, and the other one of the two is provided with the stopper 102, and the stopper 2 is movable along the radial direction of the mating cavity 101 between a locking position, in which the stopper 2 is at least partially fitted in the stopper 102, and a release position, in which the stopper 2 is disengaged from the stopper 102. In this embodiment, the limiting groove 102 is disposed in the mating cavity 101, the limiting member 2 is disposed on the outer wall of the adaptor 1, and the limiting member 2 is a limiting pin. It will be appreciated that in the locked position, the stop 2 is located inside the stop slot 102, which creates an interference between the mating cavity 101 and the adapter 1, thus preventing the crank 100 from coming out of the adapter 1; when the crank 100 needs to be disassembled, the connecting assembly is in the release position, and the limiting piece 2 is separated from the limiting groove 102, namely interference between the matching cavity 101 and the adapter piece 1 disappears, so that the crank 100 can be quickly disassembled, the operation is simple and convenient, and the disassembly and assembly efficiency is improved. Preferably, the limiting groove 102 is an annular groove extending along the circumferential direction of the matching cavity 101, so that the crank 100 can be mounted more simply and conveniently.

In other embodiments, the limiting groove 102 may not be provided as an annular groove, the limiting member 2 may be a bolt, etc. and the bolt may be inserted through the outer wall of the crank 100, after the crank 100 is assembled in place, the bolt may be screwed inward to the locking position to compress the adaptor 1, when the crank 100 needs to be disassembled, the bolt may be screwed outward to the releasing position, the bolt is not in contact with the outer peripheral surface of the adaptor 1, and the crank 100 may be separated from the adaptor 1.

Optionally, the coupling assembling still includes presses the subassembly, and adaptor 1 inside is provided with holds chamber 11, and locating part 2 wears to locate along the radial chamber wall that holds chamber 11, presses the subassembly setting in holding chamber 11 and with locating part 2 cooperation, presses the subassembly and can make locating part 2 follow locking position motion to the release position. Specifically, a radially extending through hole is formed in the side wall of the accommodating cavity 11, the limiting piece 2 movably penetrates through the through hole, one end of the limiting piece can be abutted with the pressing component, when the connecting component is in a locking position, the limiting piece 2 is abutted with the pressing component, at the moment, the limiting piece 2 extends out of the through hole to be matched with the limiting groove 102, when the crank 100 needs to be disassembled, the pressing component is pressed towards the inside of the accommodating cavity 11, the pressing component moves towards the inside of the accommodating cavity 11, the pressing component is separated from the limiting piece 2, the limiting piece 2 falls back into the through hole along the through hole, at the moment, the limiting piece 2 is separated from the limiting groove 102, interference between the crank 100 and the adapter 1 disappears, and the crank 100 can be detached from the adapter 1; and the loss of the installation tool and the locking screw is not worried, and the use cost is saved for the user.

Preferably, the pressing assembly comprises a pressing piece 3 and an elastic piece 4, one end of the elastic piece 4 is abutted against the pressing piece 3, the other end of the elastic piece is abutted against the adapter piece 1, the pressing piece 3 is matched with the limiting piece 2, as shown in fig. 4, in the locking position, the elastic piece 4 is in an extended state, the limiting piece 2 radially extends out of the accommodating cavity 11, and one end part of the pressing piece 3 away from the elastic piece 4 extends out of the accommodating cavity 11; in the release position, the elastic element 4 is in a compressed state and the limiter 2 is located in the receiving chamber, as shown in fig. 5. It can be understood that, in the locking position, one end of the limiting member 2 is in an abutting state with the pressing member 3, and under the action of the pressing member 3, the limiting member 2 extends out of the through hole to cooperate with the limiting groove 102 of the crank 100, and the elastic member 4 is in an extended state; in the release position, the supporting force of the pressing piece 3 on the limiting piece 2 disappears and the elastic piece 4 is compressed, at the moment, the limiting piece 2 is retracted into the through hole, the limiting piece 2 is separated from the limiting groove 102, and the crank 100 can be directly detached from the adapter 1. In this embodiment, the mating cavity 101 of the crank 100 is a penetrating structure, when the crank 100 is not mounted, the pressing piece 3 does not compress the elastic piece 4, the elastic piece 4 naturally stretches, at this time, part of the pressing piece 3 stretches out of the accommodating cavity 11, meanwhile, the pressing piece 3 abuts against the limiting piece 2 to enable the limiting piece 2 to stretch out of the through hole in the accommodating cavity 11, as shown in fig. 6-7, when the crank 100 is required to be mounted, the mating cavity 101 of the crank 100 is aligned with the adapter piece 1 and pushed towards the direction of the spindle 200, when the inner wall of the mating cavity 101 contacts the limiting piece 2, there is a downward pressure on the limiting piece 2, at this time, the limiting piece 2 can retract into the through hole along the axial direction of the through hole under the action of the pressure, in this process, the limiting piece 2 can squeeze the pressing piece 3 to move towards the inside of the accommodating cavity 11 (namely move towards the spindle 200), meanwhile, the elastic piece 4 is squeezed, until the crank 100 is pushed to the position of the limiting groove 102 corresponds to the position of the limiting piece 2, the extrusion force above the limiting piece 2 disappears, under the elastic piece 4, the elastic piece 3 pushes the elastic piece 2 to push the main shaft 3 to move towards the direction of the limiting piece 200, and the whole direction of the crank 2 is far away from the position of the connecting the through hole 200, and the whole connecting component is locked between the crank 100 and the position of the crank 100 is locked, and the connecting position between the connecting component and the through hole and the position of the connecting piece 100 and the through hole and the connecting piece 200; when the crank 100 needs to be disassembled, the pressing piece 3 is pressed from the direction of the matching cavity 101 of the crank 100 away from the main shaft 200 to the direction of the main shaft 200, the pressing piece 3 moves towards the inside of the accommodating cavity 11, so that the supporting force between the limiting piece 2 and the pressing piece 3 disappears, the limiting piece 2 falls back into the through hole and is separated from the limiting groove 102, the elastic piece 4 is in a compressed state, the connecting component is in a release position, the crank 100 can be directly disassembled from the adapter piece 1, the disassembling function of the crank 100 and the main shaft 200 can be realized, and compared with the mode of using an installation tool and a locking screw in the prior art, the crank quick assembling and disassembling structure can realize one-key disassembly, is simple and convenient to operate, and is quick to assemble and disassemble.

In this embodiment, the pressing member 3 is a button, and the elastic member 4 is a spring, and in order to facilitate pressing of the button, the button can be exposed from one end of the mating cavity 101 when the crank 100 is mounted on the adapter 1. In addition, in this embodiment, the maximum pressure that the spring provided is only 25N, and the strength of installation is very little, also can light dismouting crank 100 to women, old man and children user, has enlarged application range and has improved user experience. In other embodiments, the pressing member 3 may have other structures, and the elastic member 4 may have a structure such as an elastic washer.

In other embodiments, the limiting member 2 may be directly installed in the through hole through a spring, under the normal state, the limiting member 2 extends out of the through hole under the action of the spring, when the crank 100 and the adaptor 1 are required to be installed, the adaptor 1 is directly inserted into the matching cavity 101 of the crank 100, along with the pushing of the crank 100, under the extrusion of the inner wall of the matching cavity 100, the limiting member 2 moves the compression spring until the limiting member 2 is completely retracted into the through hole, the crank 100 is continuously pushed forward until the limiting groove 102 moves to the position of the limiting member 2, at this time, the interference between the limiting member 2 and the inner wall of the matching cavity 101 disappears, under the action of the spring elasticity, the limiting member 2 extends out of the through hole until the adaptor is matched in the limiting groove 102, and at this time, the connecting assembly is in the locking position.

Alternatively, as shown in fig. 1 to 10, the pressing member 3 is provided with a first inclined surface 31, and the stopper 2 is provided with a second inclined surface 21 that mates with the first inclined surface 31. Specifically, the two limiting members 2 are disposed to extend in the radial direction of the accommodating cavity 11, the two limiting members 2 are disposed symmetrically along the axial direction of the adapter 1, the first inclined surface 31 of the pressing member 3 is also disposed symmetrically along the axial direction of the adapter 1 to be respectively engaged with the two limiting members 2, wherein the upper first inclined surface 31 (the direction away from the ground) is inclined upward from the direction of the crank 100 toward the direction of the spindle 200, the second inclined surface 21 is in the same inclined direction as the first inclined surface 31 for engagement with the first inclined surface 31, that is, the first inclined surface 31 and the second inclined surface 21 are in a wedge-shaped engagement structure, when the pressing member 3 is pressed, the pressing member 3 drives the first inclined surface 31 to move toward the direction of the spindle 200, at this time, the two limiting members 2 are all moved toward the central axis of the adapter 1 along the first inclined surface 31 until retracted to the bottom position of the first inclined surface 31, and when the pressing member 3 is released, the pressing member 3 is moved toward the direction away from the spindle 200 under the action of the elastic force of the elastic member 4, so that the pressing member 3 pushes the second inclined surface 31 to move the first inclined surface 31 until the second inclined surface 2 is extended out of the through hole. In this embodiment, to ensure the locking effect of the limiting member 2 and the limiting groove 102, the extending through hole of the limiting member 2 should be kept at a certain length, and at the same time, the distance from the central axis of the pressing member 3 to the outer wall of the adaptor 1 should be ensured so that the limiting member 2 can retract into the through hole. In other embodiments, the number of the limiting members 2 may be increased or decreased adaptively, and only the reliability of locking in the locking position needs to be ensured.

In order to ensure that the stopper 2 does not come out of the through hole, the first inclined surface 31 is provided with a stopper groove 33 extending in the longitudinal direction thereof, and the second inclined surface 21 is provided with a stopper 23, and the stopper 23 is slidably connected with the stopper groove 33. Specifically, as shown in fig. 8 to 9, the stopper groove 33 is in a shape of "", and the stopper 23 is in an L-shape. In this embodiment, the L-shaped stop portion 23 is formed by forming a "" groove on one side of the stop member 2 in the axial direction, and during assembly, the stop groove 33 and the "" groove on the stop member 2 are fastened together, i.e. the stop portion 23 can be located in the stop groove 33, and the stop portion 23 and the stop groove 33 are slidably connected, so that the stop member 2 can be ensured to be always kept in a connection state with the pressing member 3 in the sliding process of the stop member 2 in the through hole, so that the stop member 2 cannot be separated from the through hole, and the use effect of the crank quick assembly and quick disassembly structure is ensured. In addition, the cooperation of the stop part 23 and the stop groove 33 in the shape of enables the stop groove 33 positioned on the first inclined surface 31 to move upwards (in the direction away from the ground) to the bottom position of the first inclined surface 31 by being matched with the stop part 23 when the pressing piece 3 is pressed to drive the first inclined surface 31 to move towards the main shaft 200, so that the unlocking of the lower stop piece 2 is completed; and the -shaped design is beneficial to the mass production and the assembly of the pressing piece 3 and the limiting piece 2, and improves the production and installation efficiency.

In another embodiment, as shown in fig. 10, the stop groove 33 and the stop portion are both T-shaped; it can be understood that the sliding connection between the T-shaped stop part and the T-shaped stop groove 33 can also ensure that the stop member 2 is always kept in a connection state with the pressing member 3 in the process of sliding in the through hole, so that the stop member 2 cannot be separated from the through hole; and the lower limiting piece 2 can be driven to move upwards (in the direction away from the ground) to the bottom position of the first inclined surface 31 away from the limiting groove 102, so that the unlocking of the lower limiting piece 2 is completed.

In another embodiment, the stop portion 23 and the stop groove 33 may not be provided, and specifically, the first inclined surface 31 is provided with an absorbing member along its length direction, and the absorbing member is in absorbing connection with the stopper 2. Preferably, the absorbing member is a high-strength neodymium magnet and the limiting member 2 is made of a material which can be absorbed by the magnet. The neodymium magnet carries out strong and effectual absorption to locating part 2, and when 3 back-and-forth movement of pressing part, neodymium magnet can drive locating part 2 and reciprocate along the through-hole, has not only guaranteed that locating part 2 can not break away from pressing part 3, and has reduced the assembly degree of difficulty and the production degree of difficulty in middle backstop portion and the T-shaped groove of this crank quick detach structure. In other embodiments, other stop arrangements may be employed as would be appreciated by those skilled in the art.

Preferably, the end of the stopper 2 remote from the pressing piece 3 is provided with a third inclined surface 22. Specifically, be provided with on the inner wall of the one end of crank 100's the cooperation chamber 101 towards main shaft 200 with third inclined plane 22 complex chamfer, when needs install crank 100 on adaptor 1, insert adaptor 1 in cooperation chamber 101, third inclined plane 22 at first cooperates with the chamfer, can play the effect of direction, be convenient for impress the through-hole with locating part 2, and then conveniently continue advancing crank 100, when hearing the one of "click", indicate that locating part 2 and spacing groove 102 cooperation is accomplished, crank 100 installs at this moment and accomplishes, easy operation is convenient, installation effectiveness has been improved greatly, the use of mounting tool has been avoided and the manufacturing of locking screw has also reduced the cost.

In this embodiment, in order to avoid relative rotation of the crank 100 and the adapter 1 after the installation is completed, the sections of the adapter 1 and the matching cavity 101 are all set to be polygonal, specifically, may be quadrilateral, pentagon or hexagon, so that the crank 100 can be ensured not to rotate relatively after the installation is completed, and the use effect is ensured. Meanwhile, in order to avoid the pressing piece 3 from falling out, as shown in fig. 2-3, a sliding groove 32 extending along the length direction is arranged on the pressing piece 3, a counter bore is arranged on the adapting piece 3, a limit screw 6 is arranged in the counter bore, a nut of the limit screw 6 is arranged in the counter bore so as to ensure that the sliding fit of the crank 100 and the adapting piece 1 is not affected, a rod part of the limit screw 6 extends into the accommodating cavity 11 and is positioned in the sliding groove 32, the rod part of the limit screw 6 is in sliding fit with the sliding groove 32, the length of the sliding groove 32 along the movement range of the pressing piece 3 in the length direction can be ensured through the arrangement of the limit screw 6, as shown in fig. 3, in the locking position, the limit screw 6 is in butt joint with the side wall of the sliding groove 32 close to the main shaft 200, and when in the releasing position, the limit screw 6 is in butt joint with the side wall of the sliding groove 32 far away from the main shaft 200. Preferably, the length of the chute 32 matches the height of the stopper 2 rising and falling in the through hole, and the specific value is not limited. In this embodiment, the rod portion of the limit screw 6 protrudes into the chute 32 by 2mm, and in order to ensure the sliding effect, the depth of the chute 32 is greater than 2mm, and in other embodiments, the above values may be adaptively adjusted.

Preferably, for improving the aesthetic property, the matching cavity 101 of the crank 100 is arranged in a step shape, the inner diameter of one end close to the main shaft 200 is larger, the larger inner diameter end is matched with the adapter 1, the shape of the smaller inner diameter end is identical to the shape and the size of the pressing piece 3, the large-area exposure of the pressing piece 3 can be avoided, the aesthetic property is improved, and the risk of false touch can be reduced.

Optionally, the spindle 200 is provided with a connecting portion 201, the adaptor 1 is sleeved on the connecting portion 201, and the locking member 5 is in threaded connection with the connecting portion 201. In this embodiment, the adapter 1 is provided with the connecting hole towards the one end of main shaft 200, and the connecting hole communicates with hold chamber 11 and the aperture of connecting hole is less than the internal diameter that holds chamber 11, forms the step portion promptly between connecting hole and hold chamber 11, and retaining member 5 is the bolt, and connecting portion 201 is provided with the screw hole, and the pole portion of bolt can with screw hole threaded connection, and the nut of bolt can support tightly at the step portion simultaneously to guarantee to lock adapter 1 and main shaft 200. Meanwhile, the nut is arranged in a step shape, the outer diameter of one end far away from the main shaft 200 is smaller than that of one end close to the main shaft 200, the elastic piece 4 is sleeved at one end of the nut far away from the main shaft 200, one end of the elastic piece 4 is abutted to the step of the nut, and the arrangement can ensure that the nut of the bolt can play a guiding role on the elastic piece 4; the nut is further provided with an operation hole for facilitating tightening of the bolt in the screw hole of the connection portion 201. In other embodiments, the nut without the bolt may be stepped, and the elastic member 4 may be directly sleeved on the nut, and one end of the elastic member may be directly abutted against the stepped portion of the adapter 1.

The crank quick assembly and quick disassembly structure in the embodiment only needs to align the matching cavity 101 of the crank 100 with the adapter 1 and push forward with force when the crank 100 is installed, and simultaneously, when the crank 100 is disassembled, the crank 100 can be taken down from the adapter 1 only by pressing the pressing piece 3, so that the operation is simple and convenient, the one-key disassembly can be realized, an installation tool is not needed, the production and manufacturing cost is reduced, and the user experience is improved.

As shown in fig. 11-12, the present embodiment further provides a pedal assembly, which includes the crank 100 and the crank quick-assembly and quick-disassembly structure described above, and further includes a pedal 300, where the pedal 300 is connected to an end of the crank 100 away from the crank quick-assembly and quick-disassembly structure. Specifically, the structure same as the crank quick assembly and disassembly structure can be used to realize quick assembly and disassembly of the foot pedal 300 and the crank 100, and other connection modes such as bolt connection in the prior art can be adopted. In this embodiment, the foot pedal 300 is installed with the crank 100 before leaving the factory, so that the installation steps of the user can be reduced, and the user experience can be improved.

When the foot pedal assembly in the embodiment is installed, firstly, the adapter 1 is connected with the main shaft 200, and the connecting assembly is connected with the adapter 1; foot pedal 300 is then connected to the end of crank 100 remote from adapter 1. It can be understood that before the foot pedal assembly leaves the factory, the adaptor 1 is connected to the spindle 200 through the locking member 5, then the connecting assembly and the adaptor 1 are installed, the connecting assembly is located at the locking position, then the foot pedal 300 is connected with the other end of the crank 100, and the installation work before leaving the factory can be completed, that is, the crank 100 and the spindle 200 are of a split structure before leaving the factory, so that the storage and the transportation are convenient.

Specifically, the mounting step further includes connecting an end of the crank 100 remote from the foot pedal 300 to the adapter 1. It will be appreciated that this step can be carried out by the user himself, and during installation, the user can simply and conveniently operate by simply aligning the mating cavity 101 of the crank 100 with the adapter 1 and then pushing it with force, without using tools. In other embodiments, the crank 100 and adapter 1 may be installed immediately prior to shipment.

The embodiment also provides a children bicycle, which comprises a main shaft 200 and two pedal assemblies, wherein the two pedal assemblies are respectively connected to two ends of the main shaft 200. In the embodiment, the children bicycle is a children bicycle, and the two pedal assemblies are not separated from each other, so that the installation time and cost of factories and users are saved. Meanwhile, the pedal assembly and the spindle 200 can be quickly disassembled and assembled, so that the pedal assembly is not installed before the children bicycle leaves a factory, the width of the children bicycle can be reduced, and the children bicycle is convenient to store and transport. In the embodiment, the width of the children bicycle can be reduced by 180mm without installing the pedal assembly; in addition, when the children bicycle is used, the pedal plate assembly can not be installed, namely the children bicycle can be used as a scooter, and after the pedal plate assembly is installed, the children bicycle is formed, so that the effect of multiple purposes of one bicycle is realized, and the experience of a user is improved. In other embodiments, the child bicycle may be an adult bicycle or the like.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims

1. The utility model provides a crank quick detach structure, its characterized in that for connect crank and main shaft, include:

the connecting component is connected with the adapter; the connecting assembly has a locking position in which the crank is engaged with the connecting assembly to lock the engagement cavity and the adapter in connection; in the release position, the crank is disengaged from the connection assembly such that the crank can be disengaged from the adapter in an axial direction of the adapter;

the connecting assembly comprises a limiting piece, wherein one of the inner wall of the matching cavity and the outer wall of the adapter piece is provided with the limiting piece, the other one of the inner wall of the matching cavity and the outer wall of the adapter piece is provided with a limiting groove, the limiting piece is movable along the radial direction of the matching cavity between a locking position and a release position, in the locking position, the limiting piece is at least partially matched in the limiting groove, and in the release position, the limiting piece is separated from the limiting groove;

the connecting assembly further comprises a pressing assembly, a containing cavity is formed in the adapter, the limiting piece penetrates through the cavity wall of the containing cavity along the radial direction of the containing cavity, the pressing assembly is arranged in the containing cavity and matched with the limiting piece, and the pressing assembly can enable the limiting piece to move from the locking position to the releasing position;

the pressing assembly comprises a pressing piece and an elastic piece, one end of the elastic piece is abutted against the pressing piece, the other end of the elastic piece is abutted against the switching piece, the pressing piece is matched with the limiting piece, in the locking position, the elastic piece is in an extending state, the limiting piece extends out of the accommodating cavity in the radial direction, and one end part of the pressing piece, far away from the elastic piece, extends out of the accommodating cavity; in the release position, the elastic piece is in a compressed state and the limiting piece is positioned in the accommodating cavity;

the pressing piece is provided with a first inclined surface, and the limiting piece is provided with a second inclined surface matched with the first inclined surface; and/or one end of the limiting piece, which is far away from the pressing piece, is provided with a third inclined surface;

the first inclined surface is provided with a stop groove extending along the length direction of the first inclined surface, the second inclined surface is provided with a stop part, and the stop part is in sliding connection with the stop groove;

the stop groove and the stop part are both T-shaped; or the stop groove is in a shape of , and the stop part is in an L shape;

the main shaft is provided with connecting portion, the adaptor cover is located connecting portion, the retaining member with connecting portion threaded connection.

2. The quick crank assembly and quick release structure of claim 1, wherein the limit groove is formed in the mating cavity, and the limit piece is formed in the outer wall of the adapter.

3. The quick crank attachment and detachment structure according to claim 1 characterized in that the pressing member is provided with a first inclined surface, and the limiting member is provided with a second inclined surface which is matched with the first inclined surface;

4. A pedal assembly comprising the crank of any one of claims 1-3 and the crank quick-release structure, and further comprising a pedal connected to an end of the crank remote from the crank quick-release structure.

5. A children's bicycle comprising a main shaft and two pedal assemblies as claimed in claim 4, the two pedal assemblies being connected to respective ends of the main shaft.