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CN-224211209-U - Fast assembling structure for bicycle crank

CN224211209UCN 224211209 UCN224211209 UCN 224211209UCN-224211209-U

Abstract

The utility model provides a bicycle crank quick-mounting structure, which comprises a connecting shaft arranged at one end of a crank, wherein an axially extending mounting hole is formed in the connecting shaft, a positioning hole which is radially communicated with the mounting hole is formed in the side wall of the connecting shaft, a positioning pin is slidably mounted in the positioning hole, a rotatable rotating sleeve is sleeved outside the connecting shaft, the outer end of the positioning pin is in linkage fit with the inner wall of the rotating sleeve, the positioning pin can be driven to move inside and outside a positioning air through rotating the rotating sleeve, when one end of a middle shaft is inserted into the mounting hole, the rotating sleeve can drive the positioning pin to move inwards to realize tight supporting and limiting with the outer wall of a middle shaft, and when the connecting shaft is unlocked, the positioning pin can be driven to move outwards through reversely rotating the rotating sleeve. The quick assembling structure of the bicycle crank disclosed by the utility model does not need any work, so that a user can quickly realize the assembly and disassembly of the crank and the middle shaft, and the user experience is improved.

Inventors

  • LI BEN

Assignees

  • 宁波途锐达休闲用品有限公司

Dates

Publication Date
20260508
Application Date
20250521

Claims (10)

  1. 1. A bicycle crank quick-assembling structure is used for connecting a crank (1) and a center shaft and is characterized by comprising The connecting shaft (2) is connected to one end of the crank (1), one end of the connecting shaft (2) is provided with a fitting hole (3) for the insertion and fitting of one end of the center shaft, and the side wall of the connecting shaft (2) is provided with a positioning hole (4) which is communicated to the fitting hole (3) along the radial direction; the locating pin (5) is arranged in the locating hole (4) in a sliding penetrating way; The rotating sleeve (6) can rotate around the axis of the rotating sleeve and is sleeved outside the connecting shaft (2), the outer end of the locating pin (5) is in linkage fit with the rotating sleeve (6), and when one end of the central shaft is inserted into the assembling hole (3), the rotating sleeve (6) can rotate to drive the locating pin (5) to move inwards to achieve tight limiting with the central shaft of the pedal, and move outwards to achieve detachment and unlocking with the central shaft of the pedal.
  2. 2. The bicycle crank quick-assembly structure of claim 1, wherein the positioning hole (4) is a countersunk through hole, the large-diameter end of the countersunk through hole is located at the radial outer end of the connecting shaft (2), an annular limiting boss (7) is arranged at the outer end of the positioning pin (5), a first elastic piece (8) is arranged between the bottom of the large-diameter end of the countersunk through hole and the limiting boss (7), an eccentric channel (9) is arranged on the inner peripheral wall of the rotating sleeve (6), and the outer end of the positioning pin (5) is abutted against the inner wall of the eccentric channel (9).
  3. 3. The quick assembling structure of the bicycle crank, as set forth in claim 1, characterized in that one end of the connecting shaft (2) far away from the crank (1) is connected with a positioning baffle ring (10), the outer end of the assembling hole (3) penetrates through the positioning baffle ring (10), and a positioning component for limiting the locking position of the rotating sleeve (6) to be reversed is arranged between the positioning baffle ring (10) and the rotating sleeve (6) and/or between the rotating sleeve (6) and the crank (1).
  4. 4. The quick assembling structure for a bicycle crank according to claim 3, wherein the positioning assembly comprises a positioning slot (11) arranged at one end of the positioning baffle ring (10) close to the rotating sleeve (6), and a positioning plugboard (12) which is in plug-in fit with the positioning groove is arranged at one end of the rotating sleeve (6) close to the positioning baffle ring (10).
  5. 5. The quick assembling structure for a bicycle crank according to claim 4, wherein a second elastic member (13) is arranged between one end of the rotating sleeve (6) far away from the positioning baffle ring (10) and the crank (1) and is used for providing a circumferential rotating restoring force and an axial moving restoring force for the rotating sleeve (6) at the same time.
  6. 6. The quick assembling structure of a bicycle crank according to claim 5, wherein an arc-shaped guiding chute (14) is concavely arranged at one end of the positioning baffle ring (10) close to the rotating sleeve (6), the bottom of one end of the guiding chute (14) is communicated with the other end of the positioning baffle ring (10) to form the positioning slot (11), when in a locking state, the positioning inserting plate (12) is inserted and positioned in the positioning slot (11) under the reset action of the second elastic piece (13), and the positioning pin (5) can be driven to move outwards by rotating a set angle along the circumferential direction after the outer end face of the rotating sleeve (6) is parallel to the bottom face of the guiding chute (14) along the axial direction so as to realize unlocking.
  7. 7. The quick assembling structure for a bicycle crank according to claim 6, wherein a containing groove (15) is formed in the inner concave portion of the rotating sleeve (6) near one end of the crank (1), so that an annular sleeve (16) is formed at one end of the rotating sleeve (6), an annular boss (17) is formed at one end of the crank (1) near the rotating sleeve (6), the outer end of the annular boss (17) is in sliding fit with the annular sleeve (16), and the second elastic piece (13) is located in the containing groove (15).
  8. 8. The bicycle crank quick-assembly structure of claim 7, wherein the second elastic piece (13) is a torsion spring, the rotation direction of the rotary sleeve (6) is consistent with that of the torsion spring, a first positioning groove (18) is formed in the bottom of the accommodating groove (15), one end of the torsion spring is inserted and assembled in the first positioning groove (18), a first positioning column (19) for connecting a first connecting end of the torsion spring is arranged in the first positioning groove (18), a second positioning groove (20) is formed in the outer end face of the annular boss (17), the other end of the torsion spring is inserted and assembled in the second positioning groove (20), and a second positioning column (21) for connecting a second connecting end of the torsion spring is arranged in the second positioning groove (20).
  9. 9. The quick assembling structure for a bicycle crank according to claim 3, wherein the positioning assembly comprises a positioning slot (11) arranged at one end of the crank (1) close to the rotating sleeve (6), a positioning insertion plate (12) which is inserted and assembled with the positioning slot (11) is arranged at one end of the rotating sleeve (6) close to the crank (1), and a second elastic piece (13) which is used for providing a circumferential rotating restoring force and an axial moving restoring force for the rotating sleeve (6) is arranged between one end of the rotating sleeve (6) far from the crank (1) and the positioning baffle ring (10).
  10. 10. The quick-assembling structure for a bicycle crank, as claimed in claim 1, characterized in that the bottom of the assembling hole (3) is provided with a spring plunger (22), and the positioning bead of the spring plunger (22) is used for abutting against the end face of the center shaft.

Description

Fast assembling structure for bicycle crank Technical Field The utility model relates to the technical field of bicycles, in particular to a bicycle crank quick-mounting structure. Background The bicycle is a common transportation means and has the advantages of energy conservation, environmental protection, convenient use and small parking occupied space. The pedal of the bicycle is a key part of the bicycle capable of walking, the pedal of the bicycle is connected with a central shaft of the bicycle through a crank, and the pedal is connected with the crank through threads. The balance car is used as a bicycle for children, and the sliding speed is controlled by two feet, so that the balance feeling and the reaction capability of the children can be well exercised, the development of cerebellum is promoted, and the activities of the strength of two legs and the coordination capability of hands and eyes are exercised in a weight-on manner. The bicycle is a riding vehicle with two legs alternately pedaling and hand-held braking, so that the left and right brain functions of the child can be developed, and the bicycle is focused on training the four limbs and the whole body coordination ability of the child. At present, a two-in-one bicycle integrating a bicycle and a balance car is also developed in the market, and the two-in-one bicycle is used for changing the bicycle into the balance car only by disassembling a crank structure with pedals and a center shaft of the bicycle. However, in the existing two-in-one bicycle structure, the connection mode of the crank and the middle shaft is still in the traditional connection structure mode, and a special tool is needed to be used, so that the assembly and the disassembly are inconvenient, and the user experience is poor. Disclosure of Invention The utility model aims to solve the technical problem of overcoming at least one defect of the related technology, and provides a bicycle crank quick-mounting structure which can quickly mount and dismount a crank and a center shaft by a user without any work, thereby improving the user experience. The technical proposal of the utility model is to provide a bicycle crank quick-mounting structure which is used for connecting a crank and a middle shaft and comprises The connecting shaft is connected to one end of the crank, one end of the connecting shaft is provided with a fitting hole for the insertion fitting of one end of the center shaft, and the side wall of the connecting shaft is provided with a positioning hole which is radially communicated with the fitting hole; the positioning pin is arranged in the positioning hole in a sliding penetrating manner; The rotating sleeve can rotate around the axis of the rotating sleeve and is sleeved outside the connecting shaft, the outer end of the positioning pin is in linkage fit with the rotating sleeve, and when one end of the central shaft is inserted into the assembling hole, the rotating sleeve can drive the positioning pin to move inwards to tightly support and limit the central shaft of the pedal, and move outwards to separate from the central shaft of the pedal for unlocking. In some embodiments, the positioning hole is a countersunk through hole, the large-diameter end of the countersunk through hole is located at the radial outer end of the connecting shaft, an annular limiting boss is arranged at the outer end of the positioning pin, a first elastic piece is arranged between the bottom of the large-diameter end of the countersunk through hole and the limiting boss, an eccentric channel is arranged on the inner peripheral wall of the rotating sleeve, and the outer end of the positioning pin is abutted against the inner wall of the eccentric channel. In some embodiments, a positioning baffle ring is connected to one end of the connecting shaft away from the crank, the outer end of the fitting hole penetrates through the positioning baffle ring, and a positioning component for limiting the locking position of the rotating sleeve to be reversed is arranged between the positioning baffle ring and the rotating sleeve and/or between the rotating sleeve and the crank. In some embodiments, the positioning assembly includes a positioning slot provided at an end of the positioning baffle ring near the rotating sleeve, and a positioning insertion plate that is inserted and assembled with the positioning groove is provided at an end of the rotating sleeve near the positioning baffle ring. In some embodiments, a second elastic member is disposed between the crank and one end of the rotating sleeve away from the positioning baffle ring, so as to provide a circumferential rotational restoring force and an axial movement restoring force for the rotating sleeve. In some embodiments, the positioning baffle ring is provided with an arc-shaped guiding chute which is concave near one end of the rotating sleeve, the bottom of one end of the guiding chute is communicated with the other en