CN219524150U - A bicycle driving device and its ratchet mechanism - Google Patents

Abstract

The utility model belongs to the field of bicycle driving, and particularly relates to a bicycle driving device and a ratchet mechanism thereof. The bicycle comprises a crank, a main chain wheel and a ratchet mechanism, wherein the tail end of the crank is connected with a pedal, the crank comprises a left crank and a right crank, and the front ends of the left crank and the right crank are both linked with the main chain wheel through the ratchet mechanism; the bicycle frame also comprises a pulley arranged on the bicycle frame, and the pulley is positioned above the tail ends of the left crank and the right crank; the device further comprises a flexible rope, wherein the first end of the flexible rope is connected with the tail end of the left crank, and the second end of the flexible rope bypasses the tail end of the right crank connected with the pulley. The utility model provides a flexible cable pulley type crank reciprocating swing driving mechanism for driving a bicycle, which has a simple structure and low cost, so as to improve the driving efficiency of the bicycle.

Description

A bicycle driving device and its ratchet mechanism

technical field

The utility model belongs to the field of bicycle drive, in particular to a bicycle drive device and a ratchet mechanism thereof.

Background technique

Bicycles, also known as bicycles or bicycles, can be used as an environmentally friendly means of transportation for transportation and travel; more and more people use bicycles as fitness equipment for cycling and exercising; bicycles themselves are also a competitive sport. Road bike racing, mountain bike racing, track cycling, stunt bike racing and more.

In addition to the extensive rotary pedaling drive, the driving mode of the bicycle also includes the reciprocating swing pedal bicycle disclosed in the Chinese utility model CN200420086927.3. A more specific analysis has been made, which will not be introduced here. In this prior art, the drive of the bicycle is realized by reciprocating swinging left and right cranks through the following technical solutions:

The bevel gear linkage mechanism is composed of two corresponding bevel gears and a middle bridge bevel gear. Two equal bevel gears have longer hubs, and their inner holes are symmetrically mounted on the same main shaft through bearings. The rotating inner holes of the double climbing rods are threadedly connected with the outer circles of the two symmetrical bevel gear outer hubs. The bevel gear of the middle bridge is fastened to the gear shaft, and its axis and the main axis are arranged vertically at 90° in the same horizontal plane, so that the two symmetrical bevel gears and the same bevel gear of the middle bridge are engaged in 90° meshing transmission to realize two landings on the left and right. The rods are cross-linked according to a certain driving angle θ (100-120°).

The side-mounted internal-toothed ratchet direct drive mechanism comprises two internal-toothed ratchets and two ratchet wheels connected with ratchets. The two inner fixed rings of the two internal tooth ratchets are threadedly connected with the outer circles of the two symmetrically installed two bevel gear outer hubs (close to the outer sides of the double-deck rotating body). The outer fixed rings of the two ratchet wheels are connected with the main shaft with a flat key (that is, a side-mounted structure). The two internal teeth of the ratchet wheel are unidirectionally driven to the ratchet wheel through the ratchet, and the driving direction is opposite to that of manpower stepping on the turning body of the climbing rod. For example, stepping on the foot on the right side makes the rotating body of the climbing rod rotate forward, driving the right bevel gear to rotate forward, and the bevel gear on the middle bridge makes the left bevel gear reversely rotate to drive the rotating body of the climbing rod on the left and the left internal tooth ratchet The reverse rotation drives the left ratchet wheel and the main shaft to rotate reversely through the ratchet. There is also a single or double (when there is a speed regulator function) driving gear on the main shaft, which is engaged with a single or double gear of the output shaft to make the output shaft rotate forward and drive the large chain of the output shaft. The wheel rotates in the forward direction, and the small sprocket and the rear wheel are driven to rotate in the forward direction through the chain transmission to make the bicycle move forward.

However, in the prior art, only the gear transmission is used to realize the reciprocating swing. The gear transmission has a compact structure and a small space occupation, but the cost is high and the structure is complicated.

The technical problem to be solved by the utility model is to provide a simple structure and low cost cable pulley type crank reciprocating swing driving mechanism to drive the bicycle. The mechanism is improved to reduce the pedaling stroke between no-load and load, so as to maximize the effective work.

Utility model content

In order to solve the above problems, the utility model provides a new technical solution: a bicycle driving device, including a crank, a main sprocket and a ratchet mechanism, the end of the crank is connected to the pedal, the crank includes a left crank and a right crank, and a left crank and a right crank. The front end of the crank is linked with the main sprocket through the ratchet mechanism;

It also includes a pulley arranged on the frame, the pulley is located above the ends of the left crank and the right crank;

Also included is a flexible cable with a first end attached to the end of the left crank and a second end looped around the pulley to attached to the end of the right crank.

The two left and right cranks are linked with the main sprocket through the ratchet mechanism. When the crank swings downward, the ratchet and the pawl engage. The ratchet and the pawl seat rotate synchronously to drive the main sprocket to rotate. Slide, crank idle.

Through flexible cable traction, when any one crank swings down to drive the bicycle forward, the other crank swings up to reset, and the bicycle is driven by swinging back and forth accordingly.

Further, the main sprocket is fixedly connected with the drive shaft;

The ratchet mechanism includes a pawl seat, a pawl and a ratchet wheel that are mated and connected; the ratchet mechanism used in this application is an assembly structure in which the external tooth ratchet is nested into the pawl seat. When the pawl seat rotates clockwise, the pawl Mesh with the teeth of the ratchet, and the ratchet and the pawl seat rotate synchronously;

Therefore, the ratchet of the first ratchet mechanism located at the right end of the drive shaft is fixedly connected to the drive shaft, and the ratchet seat is connected to the right crank.

The pawl seat of the second ratchet mechanism located at the left end of the drive shaft is fixedly connected with the drive shaft, and the ratchet is connected with the left crank.

Further, the pawl seat of the first ratchet mechanism is connected to the right crank, and the ratchet of the second ratchet mechanism is connected to the left crank.

Further, the two ends of the cable are respectively connected to the ends of the left crank and the right crank with bearings.

Further, the ends of the left crank and the right crank are provided with connecting shafts perpendicular thereto, and the bearings are arranged on the connecting shafts. The beneficial effect of connecting the flexible cable through the bearing is that the flexible cable produces a vertical angle swing change when the crank swings, and the wear of the connecting node can be reduced through the bearing connection. To or rotatable articulation to reduce the wear and tear of flexible cables.

In order to reduce the ineffective work of the driving device, the application also provides a ratchet mechanism, including a ratchet and a pawl, characterized in that the ratchet is provided with n ratchet teeth, the pawl seat is provided with m, and the ith pawl The angle difference between the seat and the first pawl seat is 2≤i≤m; make all the pawls set in the ratchet mechanism equally divide the angle occupied by a single tooth, reduce the angle between the pawl and the ratchet from overlapping to meshing, reduce the idling angle of the crank, and reduce the idling time.

Each pawl seat is provided with pawls with the same structure and size to mesh with the ratchet teeth;

An elastic restoring part is arranged between the ratchet and the ratchet seat.

Further, the elastic reset member is a spring.

The beneficial effects of the utility model are: the application provides a cable pulley type crank reciprocating swing driving mechanism with simple structure and low cost to drive the bicycle, so as to improve the driving efficiency of the bicycle;

The connection between the flexible cable and the cranks on both sides is connected by bearings, which reduces the wear of the connecting nodes; the connection between the pulley connection seat and the frame is also connected by a flexible connection, which reduces the wear of the middle part of the flexible cable.

The ratchet mechanism used in the invention can effectively reduce idling and maximize effective work after being improved in the technical solution.

Description of drawings

Fig. 1 is the schematic front view of Embodiment 1 of the utility model;

Fig. 2 is a three-dimensional schematic diagram of Embodiment 1 of the utility model;

Fig. 3 is a partial schematic diagram of the driving device of Embodiment 1 of the present utility model;

Fig. 4 is a schematic front view of Embodiment 2 of the present utility model;

Fig. 5 is the schematic diagram of the principle of the second embodiment of the utility model;

Fig. 6 is the use state diagram of the second embodiment of the utility model;

Fig. 7 and Fig. 8 are three-dimensional schematic diagrams of the use state of Embodiment 2 of the present utility model.

In the figure: 1, beam; 2, main sprocket; 3, flexible cable; 4, left crank; 5, right crank; 6, bearing; 7, pawl seat; 8, pawl; 9, ratchet; 10, connection seat.

Detailed ways

Embodiment one,

As shown in Figures 1 to 3: a bicycle driving device, the pulley is horizontally suspended on the frame beam 1, and its horizontal projection position is located on the front side of the main sprocket 2; the front ends of the left crank 4 and the right crank 5 both pass through the ratchet mechanism Linked with the main sprocket 2; the first end of the flexible cable 3 is connected to the end of the left crank 4, the second end is connected to the end of the right crank 5 around the pulley, and the two ends of the flexible cable 3 are respectively connected to the left crank 4 and the right crank 4 using bearings 6. The end of the crank 5, the ends of the left crank 4 and the right crank 5 are all provided with a connecting shaft perpendicular thereto, and the bearing 6 is arranged on the connecting shaft. The beneficial effect of connecting the flexible cable 3 through the bearing 6 is that the flexible cable 3 produces a vertical angle swing change when the crank swings, and the connection through the bearing 6 can reduce the wear and tear of the connecting node. Frame is set to universal or rotatable articulation to reduce the wearing and tearing of cable 3. The crank is made into a telescopic crank.

On the basis of the traction of the flexible cable 3, when any crank is used to drive the bicycle forward when any crank is swung downward, the other crank is swung upward to reset, and the bicycle is driven by swinging back and forth accordingly.

The ratchet mechanism includes a ratchet seat 7, a pawl 8 and a ratchet wheel 9 that are mated and connected; the ratchet mechanism used in this application is an assembly structure in which the external tooth ratchet is nested into the ratchet seat. When the ratchet seat 7 rotates clockwise , the ratchet 8 meshes with the ratchet 9 teeth, and the ratchet 9 rotates synchronously with the ratchet seat 7;

When the crank swings downwards, the ratchet 9 and the pawl 8 are engaged, and the ratchet 9 and the pawl seat 7 rotate synchronously to drive the main sprocket 2 to rotate. When the crank rotates upwards, the ratchet 9 and the pawl slide relatively, and the crank idles.

The main sprocket is fixedly connected with the drive shaft, the ratchet 9 of the first ratchet mechanism at the right end of the drive shaft is fixedly connected with the drive shaft, and the ratchet seat 7 is connected with the right crank 5.

The ratchet seat 7 of the second ratchet mechanism located at the left end of the drive shaft is fixedly connected with the drive shaft, and the ratchet 9 is connected with the left crank 4 .

Embodiment two:

As shown in Figures 4-8: a ratchet mechanism, including a ratchet 9 and a pawl 8, the ratchet 9 is provided with n ratchet 9 teeth, and the connecting seat 10 is arranged at the edge of the pawl seat 7 for hinged connection of the pawl 8. There are m connecting seats 10, and the angle difference between the i-th connecting seat 10 and the first connecting seat 10 is 2≤i≤m; make all the pawls arranged in the ratchet mechanism equally divide the angle occupied by a single tooth, reduce the angle between the pawl and the ratchet 9 from overlapping to meshing, reduce the idling angle of the crank, and reduce the idling time.

In this embodiment, the ratchet wheel 9 has 36 teeth, each tooth occupies an angle of 10°, and 4 pawls are arranged on the pawl seat 7; the angle difference between the second pawl and the first pawl for

The angle difference between the 3rd pawl and the 1st pawl is

The angle difference between the 4th pawl and the 1st pawl is

Each pawl seat 7 is provided with a pawl with the same structure and size to mesh with the teeth of the ratchet 9; The elastic reset member is a spring.

As shown in Figure 5, the 2# ratchet, 3# ratchet, and 4# ratchet are shown with dotted lines in the same position to the 1# ratchet for successive meshing demonstrations. All ratchets divide the angle occupied by a single tooth equally to reduce ratchet The angle between the pawl and the ratchet 9 from overlapping to meshing reduces the idling angle of the crank and reduces idling time.

Claims (8)

1. A bicycle driving device, comprising a crank, a main sprocket (2) and a ratchet mechanism, the end of the crank is connected to a pedal, it is characterized in that the crank comprises a left crank (4) and a right crank (5), the Both the front ends of the left crank (4) and the right crank (5) are linked with the main sprocket (2) through the ratchet mechanism; It also includes a pulley arranged on the vehicle frame, the pulley is located above the ends of the left crank (4) and the right crank (5); It also includes a cable (3), the first end of the cable (3) is connected to the end of the left crank (4), and the second end is connected to the end of the right crank (5) around the pulley. 2. A bicycle driving device according to claim 1, wherein the crank is a telescopic crank. 3. A kind of bicycle drive device as claimed in claim 1, is characterized in that, described main sprocket is fixedly connected with drive shaft; The ratchet mechanism includes a ratchet seat (7), a ratchet (8) and a ratchet (9) that are mated and connected; The ratchet (9) of the first ratchet mechanism located at the right end of the drive shaft is fixedly connected with the drive shaft; The pawl seat (7) of the second ratchet mechanism located at the left end of the drive shaft is fixedly connected with the drive shaft. 4. A kind of bicycle driving device as claimed in claim 3, characterized in that, the ratchet seat (7) of the first ratchet mechanism is connected to the right crank (5), and the ratchet (7) of the second ratchet mechanism 9) Attach the left crank (4). 5. A kind of bicycle driving device as claimed in claim 1, characterized in that, the two ends of the flexible cable (3) use bearings (6) to connect the ends of the left crank (4) and the right crank (5) respectively. end. 6. A kind of bicycle driving device as claimed in claim 5, characterized in that, the ends of the left crank (4) and the right crank (5) are provided with connecting shafts perpendicular thereto, and the bearings (6) are provided on the connecting shaft. 7. A ratchet mechanism, comprising ratchet (9), ratchet (8) and ratchet seat (7), is characterized in that, described ratchet seat (7) is provided with connection seat (10), and described ratchet (9) n ratchet teeth are provided, m connection seats (10) are provided, and the angle difference between the ith connection seat (10) and the first connection seat (10) is Each connecting seat (10) is provided with a ratchet (8) with the same structure and size to mesh with the teeth of the ratchet (9); An elastic reset member is arranged between the ratchet (8) and the connecting seat (10). 8. A ratchet mechanism according to claim 7, characterized in that the elastic return member is a spring.