KR200146477Y1 - Forward driving apparatus for bicycle - Google Patents

Abstract

The present invention relates to a forward drive device for a bicycle driven by the bicycle when the pedal is driven in reverse rotation without manipulating the lever. The driving sprocket wheel 6 rotatably installed around the fixed shaft 2 and the fixed shaft (2) a pedal shaft (4) through which the pedal (3) is fixed at both ends and rotatably installed, a housing (8) fixed to the pedal shaft (4) and rotating together, and the drive sprocket wheel ( 6) a first one-way clutch means provided between the housing 8, a plurality of relay gears 14 to reverse the rotation direction of the housing 8 to the drive sprocket wheel 6 and the fixed shaft (2) is provided with a support bracket 15 to allow the plurality of relay gears 14 to be rotatably fixed, and a second one-way clutch means provided between the support bracket 15 and the fixed shaft 2; will be.

Therefore, the operation is very convenient because the drive forward only by the reverse operation of the pedal without any additional lever operation, and the number of parts constituting such a function is very small and the structure is very simple, thereby improving the productivity and manufacturing cost by reducing assembly labor. In the reverse rotation of the pedal, the same forward driving speed as in the forward rotation is maintained.

Description

Forward drive of bicycle

1 is a cross-sectional structural view showing a forward drive of the bicycle according to the present invention.

2 is an enlarged cross-sectional view taken along the line A-A of FIG.

3 is an enlarged cross-sectional view taken along line B-B in FIG.

Figure 4 is a front view showing the relay gear installation state in the forward drive device according to the present invention.

5 is an exploded perspective view of parts showing a forward drive device according to the present invention.

* Explanation of symbols for main parts of the drawings

1 frame 2 fixed shaft

3: pedal 4: pedal shaft

6: drive sprocket wheel 6a: vertical protrusion

9,13: gear portion 8: housing

8a: housing plate 10, 16: ratchet wheel

11,17 Ratchet 12,18 Spring

14: relay gear 19: fixed pin

20: metal bearing

The present invention relates to a bicycle drive device, and more particularly, to a forward drive device of the bicycle to drive the bicycle forward in reverse rotation of the pedal without the operation of the lever.

In general, the driving device of the bicycle consists of a drive and driven sprocket wheel and a chain connecting the pedal and the rear wheel shaft, and the driven sprocket wheel of the rear wheel is provided with one-way clutch means to rotate in one direction only.

Therefore, when the pedal is rotated in the forward direction (forward direction), the rotational force is transmitted to the rear wheel by the one-way clutch means, and the bicycle is driven forward, and when the pedal is stopped or reversely rotated, the rotational force is transmitted to the rear wheel. The bicycle continues to drive forward due to inertia because it is idle.

Since the forward drive of the conventional bicycle is driven forward only by forward rotation of the pedal, the rolling motion of the pedal is monotonous, and the pedal continues to rotate only in one direction. In order to relieve fatigue, the pedal movement of the pedal was sometimes stopped or rotated in the reverse direction. There was a problem of power loss because the power was not transmitted to the rear wheel during idling of the pedal.

Therefore, in order to compensate for the above disadvantages, a device for driving the bicycle forward even in the reverse rotation of the pedal has been developed. That is, the forward drive driving device of the bicycle disclosed in Korean Patent Publication No. 95-13589, the drive sprocket for driving the driving force of the pedal shaft which is fastened to the center of the body frame and the body frame to which the fixed bracket is mounted wheel wheel is installed; A driving driving unit for transmitting to the driving driving unit, a reversing driving unit detachably coupled to the driving driving unit to reverse the reverse rotation and idling of the pedal shaft to the forward rotation, and to be transmitted to the driving sprocket, and the reversing driving unit is driven according to the intention of the occupant; It is composed of a switching lever to be detachable to the running part.

Therefore, when the cyclist operates the lever of the switching lever part while driving, the reverse driving part is coupled to the driving driving part, and when the pedal is rotated reversely, the rotation direction is switched by the reverse driving part so that the driving driving part is rotated forward. Forward driving is now possible.

However, in the forward driving device as described above, the driver must operate the lever of the switching lever so that the reverse driving unit is coupled to the driving driving unit when the forward driving is performed by the reverse rotation of the pedal while driving the bicycle. When driving, it is also necessary to disengage the inversion driving unit and the driving driving unit by operating the lever, so the operation of the lever is very cumbersome, resulting in inconvenience in operation.

In addition, since the rotation ratio is decelerated in the process of transmitting the rotational force of the driving driving unit through the inversion driving unit, the driving speed cannot be maintained at the same time as the forward rotation of the pedal, and the inversion driving unit and the switching lever unit are very complicated in structure. Since it is made of a number of parts, there is a problem that productivity is lowered and manufacturing costs are increased due to the increase in the number of assembly labor.

The present invention is to solve the conventional problems as described above, its purpose is to provide a forward drive of the bicycle easy to drive by enabling forward driving only by forward or reverse rotation of the pedal without a separate lever operation. have.

Another object of the present invention is to make the forward driving function by the forward or reverse rotation of the pedal is made of a very small number of parts and a simple structure to improve the productivity by reducing the number of assembly labor and at the same time reduce the manufacturing cost To provide a forward drive for a bicycle.

Still another object of the present invention is to provide a forward drive device for a bicycle capable of maintaining the same traveling speed by having the same rotational ratio of 1: 1 as the forward rotation of the pedal even when the pedal is reversed.

The above object is to rotate by the driving force of the pedal, and the fixed shaft fixed to the pedal-side frame of the bicycle as the center of rotation is installed to enable the drive rotation by the chain, with the fixed axis as the center of rotation to enable the fixed rotation by the chain A drive sprocket wheel; A pedal shaft penetrating into the fixed shaft to be rotatably installed and fixed at both ends of the pedal shaft; A housing having one side spaced apart from the driving sprocket wheel at a predetermined interval and fixed to the pedal shaft to rotate together; A first one-way clutch means installed between the drive sprocket wheel and the housing spaced apart from each other so that the rotational force is transmitted to the drive sprocket wheel at the forward rotation of the housing and idle at the reverse rotation of the housing; It is installed between the vertical protrusion formed to protrude perpendicularly to the extended one end of the drive sprocket wheel and the housing plate vertically assembled to the housing so as to face each other at a predetermined interval on the side of the drive sprocket wheel and the housing plate. A plurality of relay gears each engaged with the formed gear part and both outer circumferential surfaces to reverse the rotational direction of the housing to be transmitted to the drive sprocket wheel; Spaced apart from the fixed shaft at a predetermined interval, the fixed shaft is installed so as to rotate as the center of rotation, a support bracket for fixing the plurality of relay gears to be rotated on one side and between the support bracket and the fixed shaft spaced apart from each other And a second one-way clutch means installed at the support shaft to rotate in the same direction during forward rotation of the housing and to stop the support bracket fixed to the fixed shaft during reverse rotation of the housing. Can be achieved.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. 1 is a cross-sectional structural view showing a state in which the forward drive device according to the present invention is applied to the pedal of the bicycle, the hollow fixed shaft (2) is formed integrally extending to the frame (1) of the bicycle, the pedal ( The pedal shaft 4 on which the shaft 3 is fixed is supported by the bearing 5 so as to be rotatable in the fixed shaft 2, and the driving sprocket wheel 6 is disposed outside the fixed shaft 2. It is rotatably supported by).

A housing 8 is fixedly rotated to the pedal shaft 4, and the drive sprocket wheel 6 is connected to the housing 8 by at least one first unidirectional clutch means.

As shown in FIGS. 1 and 2, the first one-way clutch means is provided to be mounted on the inner peripheral surface of the housing 8 and the driving sprocket wheel 6 so as to be protruding from the ratchet wheel ( It consists of a ratchet 11 is engaged to 10, the ratchet 11 is elastically installed by a spring 12 to provide an elastic force in the direction to always engage the ratchet wheel (10), the housing 8 is positive When rotating, the ratchet 11 is engaged with the ratchet file 10 so that power is transmitted to the drive sprocket wheel 6 and the ratchet 11 is disengaged from the ratchet wheel 10 when the housing 8 is reversed. It is designed to idle without power being transmitted.

In addition, a relay gear 14 is installed between the drive sprocket wheel 6 and the housing 8 to reversely rotate the rotation direction of the housing 8 to be transmitted to the drive sprocket wheel 6. Gear portions 9 and 13 are formed at positions where the drive sprocket wheel 6 and the housing 8 face each other, and the relay gear 14 meshes with the gear portions 9 and 13.

That is, the relay gear 14 includes a vertical protrusion 6a formed to protrude perpendicularly to an extended one end of the drive sprocket wheel 6 and a housing plate 8a assembled vertically to the housing 8. Gears 9 and 13 formed on the side surface of the drive sprocket wheel 6 and the housing plate 8a are disposed to face each other and the outer circumferential surfaces of the housing 8 are engaged with each other. The rotational direction is reversed and transmitted to the drive sprocket wheel 6. At this time, it is preferable to configure the drive sprocket wheel 6 and the gear parts 9 and 13 of the housing 8 to have the same diameter so that the rotation ratio is 1: 1.

The relay gear 14 is rotatably installed around the fixing pin 19 provided on the support bracket 15, or as shown in FIG. It is to be transmitted, the metal bearing 20 is installed between the relay gear 14 and the fixing pin 19 to facilitate the rotation of the relay gear (14).

Meanwhile, the support bracket 15 is connected to the fixed shaft 2 by at least one second one-way clutch means, and the second one-way clutch means is supported by the support bracket 15 as shown in FIGS. 1 and 3. The ratchet wheel 16 formed on the inner diameter surface of the () and the ratchet 17 is mounted on the fixed shaft 13 so as to be engaged with the ratchet wheel 16, the ratchet 17 is a spring (18) It is elastically installed to provide an elastic force in the direction that always engages the ratchet wheel (16).

The second one-way clutch means, as opposed to the first one-way clutch means, the ratchet 17 is engaged with the ratchet wheel 16 when the support bracket 15 rotates in the reverse rotational direction so that the support bracket 15 is fixed. It is fixed to the shaft 2 so as not to rotate, and when the support bracket 15 is rotated forward, the ratchet 17 is disengaged from the ratchet wheel 16 so that power is not transmitted and idling.

In the present embodiment, the first and second one-way clutch means is composed of a ratchet and a ratchet wheel, but is not limited to this one-way clutch bearing may be applied.

The present invention of such a configuration is to advance the dinghy to reverse rotation as well as to rotate the pedal forward when driving the bicycle. That is, as shown in FIGS. 1 and 2, when the pedal 3 rotates forward, the housing 8 fixed to the pedal shaft 4 rotates in the direction of the arrow shown in the solid line in FIG. 2 (forward direction). Therefore, the rotational force is transmitted to the driving sprocket wheel 6 by the ratchet 11 and the ratchet wheel 10 of the first one-way clutch means, whereby the driving sprocket wheel 6 rotates forward, thereby driving the bicycle forward.

At this time, the gear part 13 of the housing 8 and the gear part 9 of the drive sprocket wheel 6 rotate in the same forward direction, and the ratchet 17 of the second one-way clutch means installed opposite to the first one-way clutch means. And the relay gear 14 engaged with the drive sprocket wheel 6 and the gear parts 9 and 13 of the housing 8 because the support bracket 15 is capable of idling in the forward direction by the ratchet wheel 16. Will rotate.

In addition, when the pedal 3 is rotated in reverse, the ratchet of the first one-way clutch means is rotated in the direction of the arrow (reverse direction) shown by the dotted lines of the first and second views of the housing 8 fixed to the pedal shaft 4. 11) and the ratchet wheel 10 is idling so that no reverse power is transmitted to the driving sprocket wheel 6, and the support bracket 15 is secured by the ratchet 17 and the ratchet wheel 16 of the second one-way clutch means. Since the fixed shaft 2 is fixed, the relay gear 14 is also fixed in position.

Therefore, the reverse rotational power of the housing 8 rotates the relay gear 14 positioned and fixed through the gear portion 13, and the relay gear 14 switches the rotation direction from reverse rotation to forward rotation, thereby shifting the gear portion 9. ) Is transmitted to the driving sprocket wheel (6).

This method uses the principle of the differential gear of the vehicle. The rotation direction is changed by the relay gear 14 even when the pedal 3 rotates in reverse, and the driving sprocket wheel 6 is rotated forward, so the bicycle continues to move forward. In this case, since the diameter of the gear 9 of the drive sprocket wheel 6 and the diameter of the gear 13 of the housing 8 are the same, the rotation ratio is 1: 1. It is possible to maintain the same traveling speed as in the forward rotation.

In this case, one or more relay gears 14 may be provided, but in consideration of economical efficiency, in consideration of the circumferential surface of each of the gear parts 13 and 9 being in contact with each other in a balanced manner. Preferably, the gears are arranged at equal intervals of 120 ° with respect to the pedal shaft 4 so that equal force is applied to the power transmission points of the relay gear 14.

According to the forward drive device of the bicycle according to the present invention as described above, the drive is driven forward only by the reverse rotation of the pedal without a separate lever operation when driving by the reverse rotation of the pedal is very troublesome operation by lever operation is eliminated As the number of parts constituting such a function is very small and the structure is very simple, productivity is reduced and manufacturing cost is reduced by reducing assembly labor, and the forward driving speed is maintained even when the pedal is reversed. It works.

Although the present invention has been described in detail only with respect to the embodiments described, it will be apparent to those skilled in the art that various modifications and changes are possible within the technical spirit of the present invention, and such modifications and modifications fall within the scope of the appended utility model registration claims. Of course.

Claims (1)

A drive sprocket wheel (6) installed to enable drive rotation by a chain, with a rotation center of the fixed shaft (2) fixed to the pedal (3) side frame (1) of the bicycle by rotating with the driving force of the pedal (3); A pedal shaft (4) penetrated in the fixed shaft (2) and rotatably installed and pedals (3) fixed at both ends thereof; A housing 8 having one side spaced apart from the driving sprocket wheel at a predetermined interval and fixed to the pedal shaft 4 to rotate together; It is installed between the drive sprocket wheel 6 and the housing 8 spaced apart from each other so that the rotational force in the forward rotation of the housing 8 is transmitted to the drive sprocket wheel (6) and to be idle when the housing 8 is rotated in reverse 1 one-way clutch means; The drive sprocket wheel 6 is provided between the vertical protrusion 6a formed to protrude perpendicularly to the extended one end of the drive sprocket wheel 6 and the housing plate 8a assembled perpendicular to the housing 8. ) And the gear parts 9 and 13 formed on the side surfaces of the housing plate 8a so as to face each other at predetermined intervals, and the outer peripheral surfaces thereof mesh with each other to reverse the rotational direction of the housing 8 to drive the sprocket wheel ( A plurality of relay gears 14 for transmitting to 6); A support bracket spaced apart from the fixed shaft 2 at a predetermined interval and installed to rotate with the fixed shaft 2 as a rotation center, and the plurality of relay gears 14 fixed to one side to be rotatably supported; 15); Installed between the support brackets 15 and the fixed shaft 2 spaced apart from each other, the support bracket 15 rotates in the same direction during forward rotation of the housing 8 and the support bracket 15 during reverse rotation of the housing 8. Second one-way clutch means fixed to the fixed shaft (2) and stopped; A forward drive of the bicycle, characterized in that it comprises a.