CN115009409A - Quick-release crank - Google Patents

Abstract

The invention relates to the technical field of bicycles, and discloses a quick-release crank. The crank is installed at the bottom bracket of a frame, and comprises a connecting shaft, a gear and crank arms installed at both ends of the connecting shaft. The connecting shaft is rotatably connected to the bottom bracket, The gear is fixedly installed on the connecting shaft. The crank arm includes a fixed end for connecting the connecting shaft and a connecting end for installing the pedal. The fixed end is provided with a fixing hole for setting the crank arm on the end of the connecting shaft. The fixing hole A clearance groove is formed on the side away from the connecting end, which runs through the fixed end. The clearance groove divides the fixed end into an upper locking block and a lower locking block, and a locking assembly for adjusting the size of the clearance groove is arranged on the upper locking block. The invention solves the problems of the prior art that a special tool is needed to fix the first crank and the gear, the installation speed is slow, and the crank is loosened in the field, which is not conducive to maintenance and inconvenient to disassemble and assemble.

Description

A quick release crank

technical field

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

Background technique

A bicycle includes a guiding system, a driving system and a braking system. The drive system consists of pedals, central axle, crankset, crank, chain, flywheel, rear axle, rear wheel and other components. The pedaling force of people's feet is driven by the pedals through cranks, sprockets, chains, flywheels, rear axles and other components, so that the bicycle keeps moving forward.

At present, when the crank is installed and fixed, special tools are needed, such as screwdrivers, screws, etc., it is very inconvenient to disassemble, install and replace, and the lock between the sprocket crank and the center axle is easy to fall off after long-term fatigue riding, and the use effect is relatively low. Difference.

Chinese Invention Patent [Publication No. CN113060236A] discloses a bicycle crank that is easy to replace, including a first crank and a second crank. A connecting block is fixed on one side of the upper end of the first crank, and the connecting block is far away from the first crank. A connecting rod is fixedly arranged in the middle of one side, a gear is movably sleeved in the middle of the surface of the connecting rod, a fixed frame is fixedly arranged on the side of the gear close to the first crank, and an end of the connecting rod away from the connecting block is fixedly arranged with a socket. A slot is fixedly arranged in the middle of the upper end surface of the second crank, and a first engaging mechanism is arranged inside the inserting block, and the first engaging mechanism includes a first engaging block, a first engaging slot, a transmission rod, A telescopic rod, an extrusion block, and a moving block are uniformly fixed around the outer surface of the insert block with a plurality of first clamping blocks. Solve the problem of inconvenient disassembly and assembly of the crank.

However, when the patented crank is installed, special tools are needed, such as using a screwdriver to drive the turntable to rotate, so that the first crank can be fixed with the gear, the installation speed is slow, and the crank is loose in the field, which is not conducive to maintenance; and the moving block is located in On the inner side, it is inconvenient to remove the second crank from the connecting rod, and the disassembly is relatively inconvenient.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present invention is to provide a quick-release crank, which solves the problem that the prior art requires a special tool to fix the first crank and the gear, the installation speed is slow, and the crank is loose in the field at the same time, which is not conducive to maintenance. ; The problem of inconvenient disassembly and assembly.

The present invention solves the above-mentioned technical problems through the following technical means:

A quick-release crank, the crank is installed at the five-way pipe of the frame, and includes a connecting shaft, a gear and crank arms installed at both ends of the connecting shaft, the connecting shaft is rotatably connected in the five-way pipe, and the gear is fixedly installed On the connecting shaft, the crank arm includes a fixed end for connecting the connecting shaft and a connecting end for installing the pedal, the fixed end is provided with a fixing hole for the crank arm to be sleeved on the end of the connecting shaft, so The side of the fixing hole away from the connecting end is provided with a clearance groove running through the fixed end, the clearance groove divides the fixed end into an upper locking block and a lower locking block, and a lock for adjusting the size of the clearance groove is provided on the upper locking block. tight components.

Further, the locking assembly includes an adjusting handle, a rotating shaft and a connecting rod, one end of the adjusting handle is integrally formed with a cam, a through hole is formed at the center of the cam, and the rotating shaft is rotatably connected in the through hole, and the The upper locking block is provided with a connecting hole, the connecting rod is inserted in 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.

Further, the lower end surface of the lower locking block is provided with a stepped hole corresponding to the connecting hole, the connecting rod is a hexagonal socket head bolt, the inner hexagonal socket head bolt is inserted in the stepped hole, and the free end of the inner hexagonal socket head bolt is provided. Through the connecting hole, it is screwed with the rotating shaft.

Further, the outer end of the upper locking block is provided with an installation groove, the cam is located in the installation groove, the end of the crank arm close to the installation groove is provided with a accommodating groove, and the free end of the adjustment handle is located in the accommodating groove. in the slot.

Further, both ends of the connecting shaft are fixedly connected with splines, the splines are inserted in the fixing holes, the splines are provided with annular grooves, and the inner side of the adjustment handle is fixedly installed with a limit rod, so The end of the limit rod penetrates the upper locking block and is clamped in the annular groove.

Further, the adjusting handle is provided with a reinforcing seat at the limit rod, and the upper locking block is provided with a notch at a position corresponding to the reinforcing seat.

Further, both ends of the connecting shaft are integrally formed with connecting columns, the splines are fixedly connected to the connecting columns, the diameter of the splines is smaller than the diameter of the connecting shaft, and the gears are sleeved on the splines, so One side of the gear is in contact with the end wall of the connecting shaft, and the other side is provided with a limiting ring, and the limiting ring is fixedly connected to the spline.

Further, both ends of the connecting shaft are provided with mounting rings, a bearing is assembled on the mounting ring, a connecting sleeve is assembled on the outside of the bearing, and the outer ring of the connecting sleeve is threadedly connected with the five-way pipe.

Beneficial effects of the present invention:

1. By setting the locking assembly, turn the adjusting handle, and the adjusting handle drives the cam to rotate. When the cam rotates, the size of the gap slot between the upper locking block and the lower locking block is increased, so that the upper locking block and the lower locking block are Locking on the spline can lock the crank arm and the connecting shaft; reduce the size of the gap between the upper locking block and the lower locking block, and make the upper locking block and the lower locking block loose, The crank arm can be removed. Simple and fast, no additional tools are required, and it is easy to maintain in the field.

2. By setting a limit rod on the inner side of the adjustment handle, the upper locking block and the lower locking block lock the connecting shaft to prevent the crank arm and the connecting shaft from being displaced, and further strengthen the limitation of the crank arm relative to the connecting shaft. The axial movement of the crank arm effectively avoids the occurrence of slack in the crank arm.

Description of drawings

Fig. 1 is the structural representation of a kind of quick release crank embodiment of the present invention;

Figure 2 is a schematic diagram of the split structure of a crank arm and an adjusting handle in an embodiment of a quick release crank according to the present invention;

3 is a schematic cross-sectional structure diagram of an embodiment of a quick release crank according to the present invention;

4 is a schematic structural diagram of the cooperation between a limit rod and a spline in an embodiment of a quick release crank according to the present invention;

5 is a schematic view of the split structure of an embodiment of a quick release crank according to the present invention;

Among them, five-way pipe 1, connecting shaft 2, mounting ring 21, bearing 22, connecting sleeve 23, connecting column 24, gear 3, crank arm 4, fixing end 41, fixing hole 411, clearance groove 412, connecting end 42, flower Key 5, annular groove 51, limit ring 52, upper locking block 61, mounting groove 611, accommodating groove 612, lower locking block 62, adjusting handle 71, cam 711, limit rod 712, reinforcing seat 713, rotating shaft 72, connecting rod 73.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in Figures 1 to 5, a quick-release crank of the present invention, the crank is installed at the bottom bracket 1 of the frame, and includes a connecting shaft 2, a gear 3 and a crank arm 4 installed at both ends of the connecting shaft 2, connecting The shaft 2 is rotatably connected in the five-way pipe 1, and the two ends of the connecting shaft 2 are provided with mounting rings 21. The mounting ring 21 is equipped with a bearing 22, and the bearing 22 is equipped with a connecting sleeve 23. The outer ring of the connecting sleeve 23 is connected with the five Threaded connection through pipe 1. The connection shaft 2 and the five-way pipe 1 are rotatably connected.

The crank arm 4 includes a fixed end 41 for connecting the connecting shaft 2 and a connecting end 42 for installing the pedal. The fixed end 41 is provided with a fixing hole 411 for setting the crank arm 4 on the end of the connecting shaft 2. The connecting shaft Both ends of 2 are fixedly connected with splines 5 , and the splines 5 are inserted into the fixing holes 411 . In this embodiment, the fixed end 41 is provided with a number of key grooves matching the splines 5 at the fixed holes 411 , and the splines 5 are clamped in the key grooves to prevent the splines 5 from rotating relative to the fixed end 41 , thereby preventing the crank arms 4 from being connected relative to each other. Axis 2 turns.

The side of the fixing hole 411 away from the connecting end 42 is provided with a clearance groove 412 penetrating the fixing end 41. The clearance groove 412 divides the fixing end 41 into an upper locking block 61 and a lower locking block 62. The upper locking block 61 is provided with a useful Locking assembly to adjust clearance slot 412 size. Adjusting the locking assembly and reducing the size of the clearance groove 412 can lock the upper locking block 61 and the lower locking block 62 on the splines 5 to prevent the crank arm 4 from loosening toward the connecting shaft 2 . Conversely, the crank arm 4 can be removed by adjusting the locking assembly to increase the size of the clearance groove 412 to loosen the crank arm 4 . It is easy to remove the crank from the bottom bracket 1.

The locking assembly includes an adjusting handle 71 , a rotating shaft 72 and a connecting rod 73 . One end of the adjusting handle 71 is integrally formed with a cam 711 , and the lower surface of the cam 711 is connected to the upper surface of the upper locking block 61 . A through hole is opened at the center of the cam 711, and the rotating shaft 72 is rotatably connected to the through hole. The upper locking block 61 is provided with a connecting hole, and the connecting rod 73 is inserted into the connecting hole, and the top of the connecting rod 73 is fixedly connected to the rotating shaft 72. , the bottom of the connecting rod 73 is fixedly connected with the lower locking block 62 . By rotating the adjusting handle 71 to drive the cam 711 to rotate, the size of the gap groove 412 between the upper locking block 61 and the lower locking block 62 can be adjusted, thereby adjusting the tightness between the crank arm 4 and the connecting shaft 2 .

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 a hexagon socket bolt, the socket socket bolt is inserted in the stepped hole, and the free end of the socket socket bolt passes through the connecting hole and the thread of the rotating shaft 72 connect. The adjustable range of the adjustment handle 71 can be changed by arranging the inner hexagon bolt, rotating the inner hexagon bolt, and changing the position of the cam 711 , thereby enhancing the adaptability of this embodiment.

An annular groove 51 is formed on the spline 5 , a limit rod 712 is fixedly installed on the inner side of the adjustment handle 71 , and the end of the limit rod 712 penetrates the upper locking block 61 and is clamped in the annular groove 51 . By setting the limit rod 712 , the axial position between the crank arm 4 and the connecting shaft 2 is limited to prevent axial movement between the crank arm 4 and the connecting shaft 2 .

The outer end of the upper locking block 61 is provided with a mounting groove 611, the cam 711 is located in the mounting groove 611, the end of the crank arm 4 close to the mounting groove 611 is provided with an accommodating groove 612, and the free end of the adjusting handle 71 is located in the accommodating groove 612 Inside. By providing the installation groove 611 and the accommodating groove 612, the cam 711 and the adjusting handle 71 can fit on the crank arm 4, and the whole is streamlined and more beautiful.

The adjusting handle 71 is provided with a reinforcing seat 713 at the limit rod 712 , and the upper locking block 61 is provided with a slot corresponding to the position of the reinforcing seat 713 , and the slot is used for accommodating the reinforcing seat 713 . By providing the reinforcing seat 713, the strength of the limiting rod 712 is enhanced, and the limiting rod 712 is prevented from being broken.

In this embodiment, the splines 5 can be integrally formed with the connecting shaft 2 or have an interference fit, which is preferably an interference fit in this embodiment to save manufacturing costs. Both ends of the connecting shaft 2 are integrally formed with a connecting column 24, and the spline 5 is fixedly connected to the connecting column 24. The diameter of the spline 5 is smaller than the diameter of the connecting shaft 2, and the gear 3 is sleeved on the spline 5. One side is in contact with the end wall of the connecting shaft 2 , and the other side is provided with a limiting ring 52 , and the limiting ring 52 is fixedly connected to the spline 5 to realize the fixed connection between the gear 3 and the connecting shaft 2 .

For a quick release crank of the present invention, when installing: first, the gear 3, the bearing 22 and the connecting sleeve 23 are assembled on the connecting shaft 2, and then the connecting shaft 2 is assembled in the bottom bracket 1 through the connecting sleeve 23. Then, the crank arm 4 is sleeved on the spline 5 through the fixing hole 411 . Then, the cam 711 on the adjustment handle 71 is placed at the installation groove 611 , the end of the adjustment handle 71 is placed in the accommodating groove 612 , and the limit rod 712 inside the adjustment handle 71 passes through the upper locking block 61 to be clamped in the annular groove 51 . Finally, pass through the lower locking block 62 and the upper locking block 61 through the inner hexagon bolt to be threadedly connected to the rotating shaft 72, so that the cam 711 is rotated and installed at the installation groove 611, and the inner hexagon bolt is rotated by a screwdriver, the cam 711 and the inner hexagonal The bolts are matched, and the upper locking block 61 and the lower locking block 62 are squeezed to reduce the size of the clearance groove 412 until the crank arm 4 is locked with the spline 5 .

When the crank arm 4 is disassembled, by rotating the adjusting handle 71, the adjusting handle 71 drives the cam 711 to rotate, the cam 711 is released from the pressing of the upper locking block 61, the size of the gap groove 412 is increased, and the crank arm 4 is loosened. The crank arm 4 is removed from the connecting shaft 2 . On the contrary, the crank arm 4 can be stably assembled on the connecting shaft 2 . The disassembly and assembly of the crank arm 4 is simple and fast, no additional tools are required, and it is convenient for field maintenance.

The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced. Without departing from the spirit and scope of the technical solutions of the present invention, all of them should be included in the scope of the claims of the present invention. The technology, shape, and structural part that are not described in detail in the present invention are all well-known technologies.

Claims (8)

1. a quick-release crank, the crank is mounted on the five-way pipe of the vehicle frame, it is characterized in that, comprises connecting shaft, gear and the crank arm installed on both ends of the connecting shaft, the connecting shaft is rotatably connected in the five-way pipe , the gear is fixedly installed on the connecting shaft, the crank arm includes a fixed end for connecting the connecting shaft and a connecting end for installing the pedal, the fixed end is provided with a crank arm for sleeves on the connecting shaft end A fixing hole in the upper part of the fixing hole, the side of the fixing hole away from the connecting end is provided with a clearance slot running through the fixing end, and the clearance slot divides the fixing end into an upper locking block and a lower locking block. Locking assembly for adjusting clearance slot size. 2 . The quick release crank according to claim 1 , wherein the locking assembly comprises an adjusting handle, a rotating shaft and a connecting rod, one end of the adjusting handle is integrally formed with a cam, and the center of the cam is at the center of the cam. 3 . A through hole is opened, the rotating shaft is rotatably connected in the through hole, a connecting hole is opened on the upper locking block, the connecting rod is inserted in the connecting hole, and the top of the connecting rod is fixedly connected with the rotating shaft, so The bottom of the connecting rod is fixedly connected with the lower locking block. 3 . The quick release crank according to claim 2 , wherein a stepped hole is opened at the lower end surface of the lower locking block corresponding to the connecting hole, and the connecting rod is a hexagon socket head bolt. The hexagonal bolt is inserted in the stepped hole, and the free end of the inner hexagonal bolt passes through the connecting hole and is threadedly connected with the rotating shaft. 4 . The quick release crank according to claim 3 , wherein a mounting groove is formed on the outer end of the upper locking block, the cam is located in the mounting groove, and the crank arm is close to the mounting groove. 5 . One end of the groove is provided with an accommodating groove, and the free end of the adjusting handle is located in the accommodating groove. 5 . The quick release crank according to claim 2 , wherein both ends of the connecting shaft are fixedly connected with splines, the splines are inserted in the fixing holes, and the splines are provided with openings. 6 . There is an annular groove, a limit rod is fixedly installed on the inner side of the adjustment handle, and the end of the limit rod penetrates the upper locking block and is clamped in the annular groove. 6 . The quick release crank according to claim 5 , wherein the adjusting handle is provided with a reinforcing seat at the limit rod, and the upper locking block is provided with a notch at a position corresponding to the reinforcing seat. 7 . 7 . The quick-release crank according to claim 5 , wherein both ends of the connecting shaft are integrally formed with connecting columns, the splines are fixedly connected to the connecting columns, and the diameters of the splines are 8. 8 . The gear is smaller than the diameter of the connecting shaft, the gear is sleeved on the spline, one side of the gear is in contact with the end wall of the connecting shaft, and the other side is provided with a limiting ring, and the limiting ring is fixedly connected to the spline. 8 . The quick release crank according to claim 1 , wherein both ends of the connecting shaft are provided with mounting rings, the mounting rings are equipped with bearings, and the bearings are equipped with connecting sleeves. 9 . The outer ring of the connecting sleeve is threadedly connected with the five-way pipe.

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