CN115009409A

CN115009409A - Quick-release crank

Info

Publication number: CN115009409A
Application number: CN202210847609.7A
Authority: CN
Inventors: 袁明; 董杰; 宋泽宇
Original assignee: Lanxi Wheel Top Cycle Industries Ltd
Current assignee: Lanxi Wheel Top Cycle Industries Ltd
Priority date: 2022-07-19
Filing date: 2022-07-19
Publication date: 2022-09-06

Abstract

The invention relates to the technical field of bicycles and discloses a quick-release crank which is arranged at a five-way pipe of a frame and comprises a connecting shaft, a gear and crank arms arranged at two ends of the connecting shaft, wherein the connecting shaft is rotatably connected in the five-way pipe, the gear is fixedly arranged on the connecting shaft, each crank arm comprises a fixed end for connecting the connecting shaft and a connecting end for mounting a pedal, a fixing hole for sleeving the crank arm at the end part of the connecting shaft is formed in the fixed end, a clearance groove penetrating through the fixed end is formed in one side, away from the connecting end, of the fixing hole, the fixed end is divided into an upper locking block and a lower locking block by the clearance groove, and a locking assembly for adjusting the size of the clearance groove is arranged on the upper locking block. The invention is used for solving the problems that the first crank and the gear can be fixed only by a special tool in the prior art, the installation speed is slow, and meanwhile, the situation of crank looseness occurs in the field, which is not beneficial to maintenance; the problem of inconvenient disassembly and assembly.

Description

Quick-release crank

Technical Field

The invention relates to the technical field of bicycles, in particular to a quick-release crank.

Background

The bicycle includes a steering system, a drive system, and a brake system. The driving system consists of pedals, a middle shaft, a chain wheel, a crank, a chain, a flywheel, a rear shaft, a rear wheel and the like. The pedal force of the human foot is transmitted by the crank, the chain wheel, the chain, the flywheel, the rear axle and other parts by the pedal, so that the bicycle continuously moves forward.

At present, when the crank is fixedly installed, special tools such as a screwdriver and a screw are needed, the crank is inconvenient to disassemble, install and replace, and the chain wheel crank and the middle shaft are easy to fall off after long-time fatigue riding and have poor using effect.

The Chinese patent publication No. CN113060236A discloses a bicycle crank convenient to replace, which comprises a first crank and a second crank, wherein a connecting block is fixedly arranged on one side of the upper end of the first crank, a connecting rod is fixedly arranged in the middle of one side, away from the first crank, of the connecting block, a gear is movably sleeved in the middle of the surface of the connecting rod, a fixed frame is fixedly arranged on one side, close to the first crank, of the gear, an inserting block is fixedly arranged at one end, away from the connecting block, of the connecting rod, a slot is fixedly arranged in the middle of the upper end surface of the second crank, a first clamping mechanism is arranged in the inserting block and comprises a first clamping block, a first clamping groove, a transmission rod, a telescopic rod, an extruding block and a moving block, and a plurality of first clamping blocks are uniformly and fixedly arranged on the periphery of the outer side surface of the inserting block. The problem of crank dismouting inconvenient is solved.

However, when the crank is loaded, a special tool is needed, for example, a screwdriver is used for driving the rotary disc to rotate, the first crank and the gear can be fixed, the mounting speed is low, and meanwhile, the condition of crank looseness occurs in the field, so that the crank is not beneficial to maintenance; and the moving block is positioned at the inner side, so that the second crank is inconvenient to take down from the connecting rod and is inconvenient to disassemble.

Disclosure of Invention

In view of the above, the invention aims to provide a quick-release crank, which solves the problems that in the prior art, a special tool is needed to fix a first crank and a gear, the installation speed is slow, and meanwhile, the crank is loosened in the field, so that the maintenance is not facilitated; the problem of inconvenient disassembly and assembly.

The invention solves the technical problems by the following technical means:

the utility model provides a quick detach crank, the crank is installed in five-way pipe department of frame, includes connecting axle, gear and installs in the crank arm at connecting axle both ends, the connecting axle rotates to be connected in the five-way pipe, gear fixed mounting is on the connecting axle, the crank arm is including the link that is used for connecting the stiff end of connecting axle and is used for installing the footboard, offer on the fixed end and be used for establishing the fixed orifices at the connecting axle tip with the crank arm cover, the clearance groove that runs through the stiff end is seted up to one side that the link was kept away from to the fixed orifices, the clearance groove divide into locking block and lower locking block with the stiff end, go up and be provided with the locking Assembly who adjusts the clearance groove size on the locking block.

Further, locking Assembly includes adjustment handle, pivot and connecting rod, adjustment handle's one end integrated into one piece has the cam, the centre of a circle department of cam has seted up the through-hole, the pivot is rotated and is connected in the through-hole, the connecting hole has been seted up on the last locking piece, the connecting rod is inserted and is located in the connecting hole, the top and the pivot fixed connection of connecting rod, the bottom and the lower locking piece fixed connection of connecting rod.

Furthermore, a stepped hole is formed in the lower end face of the lower locking block corresponding to the connecting hole, the connecting rod is an inner hexagon bolt, the inner hexagon bolt is inserted into the stepped hole, and the free end of the inner hexagon bolt penetrates through the connecting hole to be in threaded connection with the rotating shaft.

Furthermore, the outer end portion of the upper locking block is provided with a mounting groove, the cam is located in the mounting groove, one end, close to the mounting groove, of the crank arm is provided with a containing groove, and the free end of the adjusting handle is located in the containing groove.

Furthermore, the both ends of connecting axle all fixedly connected with spline, the spline is inserted and is located the fixed orifices, seted up the ring channel on the spline, the inboard fixed mounting of adjustment handle has the gag lever post, the tip of gag lever post runs through the locking piece card and locates in the ring channel.

Furthermore, the adjusting handle is provided with a reinforcing seat at the limiting rod, and a notch is formed in the position, corresponding to the reinforcing seat, of the upper locking block.

Furthermore, the both ends homogeneous body shaping of connecting axle has the spliced pole, spline fixed connection is on the spliced pole, the diameter of spline is less than the diameter of connecting axle, the gear sleeve is established on the spline, one side and the connecting axle end wall of gear offset, and the opposite side is provided with the spacing ring, spacing ring fixed connection is on the spline.

Further, the both ends of connecting axle all are provided with the collar, be equipped with the bearing on the collar, the adapter sleeve is equipped with outward to the bearing, the outer lane and the five-way pipe threaded connection of adapter sleeve.

The invention has the beneficial effects that:

1. the adjusting handle is rotated through the locking assembly, the adjusting handle drives the cam to rotate, and when the cam rotates, the size of a clearance groove between the upper locking block and the lower locking block is increased, so that the upper locking block and the lower locking block are locked on the spline, and the crank arm and the connecting shaft can be locked; the size of a clearance groove between the upper locking block and the lower locking block is reduced, so that the upper locking block and the lower locking block are loosened, and the crank arm can be detached. The method is simple and quick, does not need to use extra tools, and is convenient for field maintenance.

2. Set up the gag lever post through the inboard at adjustment handle, at last latch segment with lower latch segment with the connecting axle locking, prevent that crank arm and connecting axle from taking place the basis of phase displacement, further strengthen the axial displacement of the relative connecting axle of restriction crank arm, effectively avoid the condition that the crank arm is lax to appear.

Drawings

FIG. 1 is a schematic structural view of an embodiment of a quick release crank of the present invention;

FIG. 2 is a schematic view of a disassembled structure of a crank arm and an adjustment handle of an embodiment of a quick release crank of the present invention;

FIG. 3 is a schematic cross-sectional view of an embodiment of a quick release crank of the present invention;

FIG. 4 is a schematic view of a structure of a quick release crank embodiment of the present invention in which a stop bar is engaged with a spline;

FIG. 5 is a schematic view of a disassembled structure of an embodiment of a quick release crank of the present invention;

the five-way pipe comprises a five-way pipe 1, a connecting shaft 2, a mounting ring 21, a bearing 22, a connecting sleeve 23, a connecting column 24, a gear 3, a crank arm 4, a fixed end 41, a fixing hole 411, a clearance groove 412, a connecting end 42, a spline 5, an annular groove 51, a limiting ring 52, an upper locking block 61, a mounting groove 611, a containing groove 612, a lower locking block 62, an adjusting handle 71, a cam 711, a limiting rod 712, a reinforcing seat 713, a rotating shaft 72 and a connecting rod 73.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

As shown in fig. 1-5, the quick release crank of the invention is mounted at a five-way tube 1 of a frame, and comprises a connecting shaft 2, a gear 3 and crank arms 4 mounted at two ends of the connecting shaft 2, wherein the connecting shaft 2 is rotatably connected in the five-way tube 1, two ends of the connecting shaft 2 are respectively provided with a mounting ring 21, a bearing 22 is assembled on the mounting ring 21, a connecting sleeve 23 is assembled outside the bearing 22, and an outer ring of the connecting sleeve 23 is in threaded connection with the five-way tube 1. The connecting shaft 2 is rotatably connected with the five-way pipe 1.

The crank arm 4 includes the stiff end 41 that is used for connecting axle 2 and the link 42 that is used for installing the footboard, offers on the stiff end 41 to be used for establishing the fixed orifices 411 at connecting axle 2 tip with crank arm 4 cover, and the equal fixedly connected with spline 5 in both ends of connecting axle 2, spline 5 insert locate in the fixed orifices 411. In this embodiment, the fixed end 41 is provided with a plurality of keyways matching with the spline 5 in the fixed hole 411, and the spline 5 is clamped in the keyways, so as to prevent the spline 5 from rotating relative to the fixed end 41, and further prevent the crank arm 4 from rotating relative to the connecting shaft 2.

The fixing hole 411 is opened with a clearance slot 412 penetrating the fixing end 41 on the side away from the connecting end 42, the clearance slot 412 divides the fixing end 41 into an upper locking block 61 and a lower locking block 62, and the upper locking block 61 is provided with a locking component for adjusting the size of the clearance slot 412. By adjusting the locking assembly to reduce the size of the clearance slot 412, the upper and

lower locking blocks

61, 62 are locked to the splines 5 to prevent the crank arm 4 from loosening toward the connecting shaft 2. Conversely, adjusting the locking assembly increases the size of the clearance slot 412, loosening the crank arm 4, and removing the crank arm 4. The crank is convenient to detach from the five-way pipe 1.

The locking assembly comprises an adjusting handle 71, a rotating shaft 72 and a connecting rod 73, wherein a cam 711 is integrally formed at one end of the adjusting handle 71, and the lower surface of the cam 711 is connected with the upper surface of the upper locking block 61. The center of the cam 711 is provided with a through hole, the rotating shaft 72 is rotatably connected in the through hole, the upper locking block 61 is provided with a connecting hole, the connecting rod 73 is inserted in the connecting hole, the top of the connecting rod 73 is fixedly connected with the rotating shaft 72, and the bottom of the connecting rod 73 is fixedly connected with the lower locking block 62. The adjustment handle 71 is rotated to drive the cam 711 to rotate, so that the size of the clearance groove 412 between the upper locking block 61 and the lower locking block 62 can be adjusted, and the tightness degree between the crank arm 4 and the connecting shaft 2 can be adjusted.

The lower end face of the lower locking block 62 is provided with a stepped hole corresponding to the connecting hole, the connecting rod 73 is an inner hexagon bolt, the inner hexagon bolt is inserted into the stepped hole, and the free end of the inner hexagon bolt penetrates through the connecting hole to be in threaded connection with the rotating shaft 72. By arranging the hexagon socket head cap screw and rotating the hexagon socket head cap screw, the position of the cam 711 is changed, the adjustable range of the adjusting handle 71 can be changed, and the adaptive range of the embodiment is enhanced.

An annular groove 51 is formed in the spline 5, a limiting rod 712 is fixedly mounted on the inner side of the adjusting handle 71, and the end of the limiting rod 712 penetrates through the upper locking block 61 and is clamped in the annular groove 51. By providing the stopper rod 712, the axial position between the crank arm 4 and the connecting shaft 2 is restricted, and the crank arm 4 and the connecting shaft 2 are prevented from moving axially.

The outer end of the upper lock block 61 is provided with a mounting groove 611, the cam 711 is positioned in the mounting groove 611, one end of the crank arm 4 close to the mounting groove 611 is provided with a receiving groove 612, and the free end of the adjusting handle 71 is positioned in the receiving groove 612. Through setting up mounting groove 611 and holding tank 612, make cam 711 and adjustment handle 71 can laminate on crank arm 4, and the whole is streamlined, and is more pleasing to the eye.

The adjusting handle 71 is provided with a reinforcing seat 713 at the position of the limiting rod 712, and the upper locking block 61 is provided with a notch corresponding to the reinforcing seat 713, and the notch is used for accommodating the reinforcing seat 713. The reinforcing seat 713 is provided to reinforce the strength of the stopper rod 712 and prevent the stopper rod 712 from being broken.

In this embodiment, the spline 5 may be integrally formed with the connecting shaft 2 or in an interference fit, and the embodiment is preferably in an interference fit, so that the manufacturing cost is saved. The connecting column 24 is integrally formed at the two ends of the connecting shaft 2, the spline 5 is fixedly connected to the connecting column 24, the diameter of the spline 5 is smaller than that of the connecting shaft 2, the gear 3 is sleeved on the spline 5, one side of the gear 3 is abutted to the end wall of the connecting shaft 2, the limiting ring 52 is arranged at the other side of the gear 3, and the gear 3 is fixedly connected to the spline 5, so that the gear 3 is fixedly connected with the connecting shaft 2.

The invention discloses a quick-release crank, which is characterized in that when in installation: firstly, the gear 3, the bearing 22 and the connecting sleeve 23 are all assembled on the connecting shaft 2, and then the connecting shaft 2 is assembled in the five-way pipe 1 through the connecting sleeve 23. Subsequently, the crank arm 4 is fitted over the spline 5 through the fixing hole 411. Then, the cam 711 on the adjustment handle 71 is placed at the mounting groove 611, the end of the adjustment handle 71 is placed in the receiving groove 612, and the stopper 712 inside the adjustment handle 71 is caught in the annular groove 51 through the upper locking block 61. Finally, the cam 711 is rotatably mounted at the mounting groove 611 by passing an inner hexagon bolt through the lower locking block 62 and the upper locking block 61 to be in threaded connection with the rotating shaft 72, and the cam 711 is matched with the inner hexagon bolt by rotating the inner hexagon bolt through a screwdriver, so that the upper locking block 61 and the lower locking block 62 are pressed, and the size of the clearance groove 412 is reduced until the crank arm 4 is locked with the spline 5.

When the crank arm 4 is detached, the adjustment handle 71 is rotated, the adjustment handle 71 drives the cam 711 to rotate, the cam 711 is separated from the upper locking block 61, the size of the clearance groove 412 is increased, the crank arm 4 is loosened, and the crank arm 4 can be detached from the connecting shaft 2. Conversely, the crank arm 4 can be firmly fitted on the connecting shaft 2. The crank arm 4 is simple and quick to disassemble and assemble, does not need to use extra tools, and is convenient for field maintenance.

Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims. The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.

Claims

1. The utility model provides a quick detach crank, the crank is installed in five-way pipe department of frame, its characterized in that, includes connecting axle, gear and installs in the crank arm at connecting axle both ends, the connecting axle rotates to be connected in five-way pipe, gear fixed mounting is on the connecting axle, the crank arm is including the stiff end that is used for connecting the connecting axle and the link that is used for installing the footboard, offer on the fixed end and be used for establishing the fixed orifices at the connecting axle tip with the crank arm cover, the clearance groove that runs through the stiff end is seted up to one side that the link was kept away from to the fixed orifice, the clearance groove divide into locking block and lower locking block on with the stiff end, go up and be provided with the locking Assembly who has the regulation clearance groove size on the locking block.

2. The quick release crank of claim 1, wherein the locking assembly comprises an adjustment handle, a rotating shaft and a connecting rod, a cam is integrally formed at one end of the adjustment handle, a through hole is formed at the center of the cam, the rotating shaft is rotatably connected in the through hole, a connecting hole is formed in the upper locking block, the connecting rod is inserted into the connecting hole, the top of the connecting rod is fixedly connected with the rotating shaft, and the bottom of the connecting rod is fixedly connected with the lower locking block.

3. The quick release crank of claim 2, wherein the lower end of the lower locking block is provided with a stepped hole corresponding to the connecting hole, the connecting rod is a hexagon socket head cap screw, the hexagon socket head cap screw is inserted into the stepped hole, and the free end of the hexagon socket head cap screw passes through the connecting hole and is in threaded connection with the rotating shaft.

4. The quick release crank of claim 3 wherein the outer end of the upper lock block defines a mounting recess, the cam is located in the mounting recess, the crank arm defines a receiving slot at an end thereof adjacent to the mounting recess, and the free end of the adjustment handle is located in the receiving slot.

5. The quick release crank of claim 2, wherein both ends of the connecting shaft are fixedly connected with splines, the splines are inserted into the fixing holes, the splines are provided with annular grooves, the inner side of the adjusting handle is fixedly provided with a limiting rod, and the end of the limiting rod penetrates through the upper locking block and is clamped in the annular grooves.

6. The quick release crank of claim 5 wherein the adjustment handle has a reinforcement base at the position of the stop lever, and the upper lock block has a notch at a position corresponding to the reinforcement base.

7. The quick release crank of claim 5, wherein the connecting shaft has a connecting post integrally formed at both ends thereof, the spline is fixedly connected to the connecting post, the diameter of the spline is smaller than that of the connecting shaft, the gear is sleeved on the spline, one side of the gear abuts against the end wall of the connecting shaft, and the other side of the gear is provided with a limit ring fixedly connected to the spline.

8. The quick release crank of claim 1, characterized in that both ends of the connecting shaft are provided with a mounting ring, a bearing is assembled on the mounting ring, a connecting sleeve is assembled outside the bearing, and an outer ring of the connecting sleeve is in threaded connection with the five-way pipe.