KR200298784Y1 - A driving gear for a bicycle - Google Patents

Abstract

The present invention relates to a drive device for a bicycle, the crank gear assembly 10 is a plurality of bevel gears concentrically coupled; An idler 20 engaged with the crank gear assembly 10 to rotate the drive shaft 60; A pressing member 30 for returning the bevel gear of the crank gear assembly 10; A driven bevel gear 50 attached to one side of the hub 101 coupled to the center of the rear wheel 110 and integrally rotating with the hub 101; And a conversion lever 70 for selectively engaging the bevel gear of the crank gear assembly 10 with the idler 20.

The present invention is efficient power transmission is made possible to prevent the loss of manpower and smooth running of the bicycle, it is possible to prevent failure even during long time use.

Description

A driving gear for a bicycle

The present invention relates to a bicycle, and in particular, bevel gears having different diameters are arranged in concentric shapes to form a crank gear assembly, and the power transmission process by transmitting the driving force of the crank gear assembly to the rear wheel by the drive shaft. The present invention relates to a bicycle driving device configured to prevent a failure of a bicycle while preventing a loss of manpower and enabling a smooth driving of the bicycle.

In general, a bicycle used as an exercise device or a vehicle is progressed by rotating a crank gear by a driving force transmitted through a pedal, and transmitting the rotational force of the crank gear to a rear wheel through a chain.

At this time, the crank gear is a smooth running is possible by allowing the crank gear to be changed by the state of the road surface including the inclination, etc. as a plurality of sprockets having different number of teeth.

1 is a side view showing a bicycle having a conventional structure for driving the rear wheel 230 by transmitting the driving force of the crank gear 220 to the rear by the chain 210, such a bicycle 300 of the chain drive method In the space between the front wheel 240 and the rear wheel 230 rotatably coupled from the front and rear surfaces of the frame 250 is provided with a crank gear 220 in which different number of gears are stacked, the crank gear 220 On both sides of the central portion of the crank has a structure in which the cranks 212 attached to the pedals 211 are respectively connected.

In addition, in the recent bicycle, the driven gear 221 of the rear wheel 230 to which the chain 210 is connected is overlapped with sprockets having different teeth, thereby increasing the selectable gear ratio to widen the transmission range.

Meanwhile, the chain 210 connected to the driven gear 221 of the crank gear 220 and the rear wheel 230 may flexibly respond to a change in the distance between the crank gear 220 and the driven gear 221 and transmit power over a long distance. On the other hand, due to the characteristics of the chain 210 in the power transmission process, the lower portion should be kept in a relaxed state, and thus efficiency is lowered, thereby causing a problem such as increased manpower consumption.

In addition, since the chain 210 is easily separated from the crank gear 220 and the driven gear 221 in the use process, there are problems such as a lot of inconveniences in use and a limited lifetime.

The present invention is to solve the conventional problems as described above, the technical problem of the present invention is to transfer the driving force of the crank gear assembly to the rear wheel by the drive shaft to increase the power transmission efficiency to smoothly drive the bike, failure On the other hand, to provide a means that can be used for a long time.

The technical problem of the present invention as described above,

A crank gear assembly configured to axially movably couple a plurality of bevel gears arranged concentrically to the outer circumferential surface of the crank shaft;

An idler which sequentially stacks the bevel gears meshing with the bevel gears of the crank gear assembly and integrally rotates in contact with any one of the bevel gears of the crank gear assembly;

The first bevel gear, the second bevel gear, and the second bevel gear protruding in an axial direction in close contact with the first bevel gear, the second bevel gear, the third bevel gear, the fourth bevel gear, and the fifth bevel gear of the crank gear assembly. A pressing member in which a leaf spring for pressing the third bevel gear, the fourth bevel gear and the fifth bevel gear is arranged in an arc shape;

A housing coupled to the crank gear assembly and the outside of the idler and the pressing member to rotatably support the crank shaft and the idler;

A driven bevel gear attached to one side of the hub coupled to the center of the rear wheel and integrally rotating with the hub;

A drive shaft coupled between the idler and the driven bevel gear to transfer the driving force of the crank gear assembly transferred through the idler by the bevel gears formed on both ends of the driven bevel gear; And

Providing a driving device for a bicycle, characterized in that the two ends are rotatably supported by each of the conversion lever is inserted into the pressing ball for pressing the rear both sides of each bevel gear of the crank gear assembly spirally from both sides of the outer peripheral surface. Is achieved.

Hereinafter, with reference to the accompanying drawings the drive device for a bicycle according to the present invention will be described in detail.

1 is a side view of a bicycle having a conventional structure,

2 is a plan view of the present invention,

3 is a front view showing the main part of the present invention,

4 is a side view of a bicycle to which the present invention is applied,

5A and 5B are plan views illustrating the operation of the present invention.

<Explanation of symbols for main parts of drawing>

1: first bevel gear 2: 2nd bevel gear

3: third bevel gear 4: fourth bevel gear

5: fifth bevel gear 10: crank gear assembly

11,12,13,14,15: Bevel Gear 20: Idler

21: leaf spring 30: pressing member

40 housing 50 driven bevel gear

60: drive shaft 61, 62, 63, 64, 65: pressure ball

70: conversion lever 90: crankshaft

110: rear wheel

Figure 2 is a plan view of the subject innovation, Figure 3 is a front view showing the main part of the subject innovation, Figure 4 is a side view of a bicycle to which the subject innovation is applied, the driving device for bicycles 100 according to the subject innovation, different diameters A plurality of bevel gears having a crank gear assembly 10 arranged in a concentric shape, the idler 20 is engaged with the crank gear assembly 10 to rotate together with the crank gear assembly 10, the crank gear assembly ( 10, the crank gear assembly 10 and the housing 40 coupled to the outside of the idler 20 and the pressing member 30, and the rear wheels. The drive shaft 60 and the conversion lever 70 are coupled between the driven bevel gear 50, the crank gear assembly 10 and the driven bevel gear 50 attached to the hub of the.

In the crank gear assembly 10, the second bevel gear 2 is coupled to the outer circumferential surface of the first bevel gear 1 that is rotated by the drive of the crank shaft 90, and the second bevel gear 2 is described above. The third bevel gear (3) is coupled to the outer circumferential surface of), and the fourth bevel gear (4) and the fifth bevel gear (5) are sequentially coupled to the outer circumferential surface of the third bevel gear (3).

At this time, splines (S) are formed on the outer circumferential surface of each bevel gear, and the first bevel gear (1), the second bevel gear (2), the third bevel gear (3), and the fourth bevel gear (4). And a spline groove H is formed on the inner circumferential surface of the fifth bevel gear 5 so that the first bevel gear 1, the second bevel gear 2, the third bevel gear 3, and the fourth bevel gear ( 4) and the fifth bevel gear 5 are capable of protruding forward from the crankshaft 90, or from adjacent gears, while the rotation is integrally performed during rotation.

In addition, the crank gear assembly 10 includes a first bevel gear 1, a second bevel gear 2, a third bevel gear 3, a fourth bevel gear 4, and a fifth bevel gear 5. Crank gear assembly 10 is rotated by the rotational force transmitted through the crankshaft 90 by the idler 20, which sequentially stacks the bevel gears 11, 12, 13, 14, and 15 that engage each other). In the process of rotating the idler 20 is made.

At this time, the first bevel gear (1), the second bevel gear (2), the third bevel gear (3), the fourth bevel gear (4) and the fifth bevel gear (5) is formed in a gear proportional to the diameter is sequentially As the number of teeth increases, the idler 20 engaged with the crank gear assembly 10 has different rotational speeds according to the contact position with each bevel gear.

That is, for example, the idler 20 has the smallest rotation speed for one revolution of the crankshaft 90 in the engaged state with the first bevel gear 1, while in the engaged state with the fifth bevel gear 5. Has the greatest number of revolutions.

In addition, the idler 20 has the smallest rotational force when engaged with the fifth bevel gear 5, while the fourth bevel gear 4, the third bevel gear 3, the second bevel gear 2 and The rotational force is sequentially increased during the engagement with the first bevel gear 1 to have the largest rotational force during the engagement with the first bevel gear 1.

Subsequently, the first bevel gear 1, the second bevel gear 2, the third bevel gear 3, the fourth bevel gear 4 and the fifth bevel gear 5 protruding in the axial direction are initially positioned. The pressing member 30 to return to the first bevel gear 1, the second bevel gear 2, the third bevel gear 3, the fourth bevel gear 4 and the fifth bevel gear 5, respectively. A plate in which the first bevel gear (1), the second bevel gear (2), the third bevel gear (3), the fourth bevel gear (4) and the fifth bevel gear (5) are in contact with each other in contact with each other. The pressing members 30 to press each by the elasticity of the spring 21 is coupled.

At this time, the leaf spring 21 of the pressing member 30 is the first bevel gear (1), the second bevel gear (2), the third bevel gear (3), the fourth bevel gear (4) and the fifth By symmetrically arranging a plurality of left and right symmetrical sides to press each side of the bevel gear 5 so as to effectively pressurize each bevel gear, in particular the first bevel gear (1), the second bevel gear (2), The first bevel gear 1 and the second bevel gear 1 are formed by limiting the contact portions of the third bevel gear 3, the fourth bevel gear 4, and the fifth bevel gear 5 to the lower periphery where no gear is formed. 2), the occurrence of rotational resistance and noise due to excessive friction with the third bevel gear (3), the fourth bevel gear (4) and the fifth bevel gear (5).

Subsequently, the crank gear assembly 10, the idler 20, and the outside of the pressing member 30 support the crank gear assembly 10 and the idler 20, and provide an installation space of the pressing member 30. On the other hand, the housing 40 is stored in the lubricating oil is coupled through the lower space, the conversion lever 70 is horizontally coupled to one side.

The conversion lever 70 has a first bevel gear 1, a second bevel gear 2, a third bevel gear 3, a fourth bevel gear 4 and a fifth bevel gear 5 according to the rotation angle. ) By selectively pressing and moving in the axial direction to engage any one of the bevel gears 11, 12, 13, 14, 15 of the idler 20, and accordingly rotate the idler 20. Pressing balls 61 and 62 for pressing the first bevel gear 1, the second bevel gear 2, the third bevel gear 3, the fourth bevel gear 4 and the fifth bevel gear 5, 63, 64, 65 are inserted spirally, respectively.

At this time, the pressure ball (61, 62, 63, 64, 65) is coupled in a symmetrical state from both sides of the outer circumferential surface, the center of the conversion lever 70 in accordance with the contact with the crank shaft 90 in the angle variable process The curved portion 70A is formed to prevent interference.

In addition, the first bevel gear (1), the second bevel gear (2), the first bevel gear (1) by arranging a plurality of balls (66) rotatably and continuously in the adjacent portion of each of the pressing balls (61, 62, 63, 64, 65) While preventing the friction caused by the contact with the third bevel gear (3), the fourth bevel gear (4) and the fifth bevel gear (5), the first bevel gear (1), the second bevel gear (2), The third bevel gear (3), the fourth bevel gear (4) and the fifth bevel gear (5) to enable a smooth rotation.

Subsequently, on one side of the hub 101 coupled to the center of the rear wheel, a bevel gear-shaped driven bevel gear 50 that enables rotation of the rear wheel by driving the hub 101 is attached, and the driven bevel described above. Gear 50 is one end of the drive shaft 60 is connected.

The drive shaft 60 is coupled between the driven bevel gear 50 and the idler 20 to transfer the driving force of the crank gear assembly 10 transmitted through the idler 20 to the driven bevel gear 50 to provide a rear wheel. By rotating, the bevel gears 51 and 52 which mesh with the idler 20 and the driven bevel gear 50 are formed on both sides.

Meanwhile, in the present exemplary embodiment, the bevel gears of the crank gear assembly 10 include the first bevel gear 1, the second bevel gear 2, the third bevel gear 3, the fourth bevel gear 4, and the fifth bevel gear. The bevel gear 5 is composed of the first bevel gear 1, the second bevel gear 2, the third bevel gear 3, the fourth bevel gear 4 and the fifth bevel gear 5. Five bevel gears 11, 12, 13, 14, and 15 are in direct contact with the idler 20, and together with five pressing balls 61, 62, 63, and 64 on the outer circumferential surface of the conversion lever 70. And 65) are combined, but the present invention is not limited thereto, and the driving device has three to eight gear shift gears by adding or subtracting the number of bevel gears and pressurized balls according to the type of bicycle to be applied. can do.

In the figure, reference numeral B denotes a bearing, and reference numeral 70A denotes a mark formed on the surface of the conversion lever 70 so as to identify the number of gears engaged.

The operation and effects of the present invention made of the above-described configuration will be described below.

Bicycle drive device 100 according to the present invention is installed in the lower portion of the frame 130 located between the front wheel 110 and the rear wheel 120 to the crank shaft 90 by the attraction force transmitted through the pedal and crank Rotate, and the driving force is made as the rotational force of the crank shaft 90 is transmitted to the rear wheel 110.

The present invention is such that the third bevel gear 3 of the crank gear assembly 10 is moved in the axial direction in a normal driving state, so that the bevel gear 11 of the idler 20 is moved. 12, 13, 14, 15 is engaged with the bevel gear 13 of the intermediate position so that the running speed and the rotational force is maintained in the intermediate stage.

In this process, when a large turning force is required for traveling on a steep road surface, as shown in FIG. 5a, the conversion lever 70 is rotated to the first gear shifting position, and the compression balls 61, 62, 63, While rotating the pressure ball 61 adjacent to the center of the conversion lever 70 in the horizontal state of the 64,65, the pressure ball 61 is thereby protruded forward.

As described above, when the pressure ball 61 adjacent to the center is horizontally positioned, the first bevel gear 1, the second bevel gear 2, the third bevel gear 3, and the third bevel gear 1 of the crank gear assembly 10 are positioned. The first bevel gear 1 directly connected to the crankshaft 90 of the four bevel gears 4 and the fifth bevel gears 5 is pressed forward.

Accordingly, the first bevel gear 1 is engaged with the bevel gear 11 positioned at the tip of the idler 20 to rotate the drive shaft 60 at a low speed by a strong rotational force, and the drive shaft 60 is a bevel formed at the other end. The rear wheel 110 is driven by rotating the driven bevel gear 50 attached to the hub 101 by the gear 52.

In such a process, when driving at a high speed by traveling on a flat road surface, the conversion lever 70 is continuously rotated in the same direction as the above-described process to convert it into a corresponding number of stages. For example, the conversion lever 70 is shifted to five positions. Rotating to, the pressure ball 61 located at the tip of the pressure ball (61, 62, 63, 64, 65) coupled to the outer circumferential surface of the conversion lever 70 is maintained in a horizontal state to protrude forward Have

Subsequently, when the pressing balls 61 in both ends are horizontally positioned as described above, the first bevel gear 1, the second bevel gear 2, and the third bevel gear 3 of the crank gear assembly 10. , The fifth bevel gear 5 having the largest number of teeth among the fourth bevel gear 4 and the fifth bevel gear 5 is pressed from the rear to move forward, and thus the fifth bevel gear 5 Is in close contact with the bevel gear 15 of the idler 20.

On the other hand, the first bevel gear (1), the second bevel gear (2), the third bevel gear (3) and the fourth bevel gear (4) that the pressure is not transmitted from the rear in this process is the pressing member 30 The first bevel gear (1), the second bevel gear (2), and the third bevel gear (3) except for the fifth bevel gear (5) because they do not protrude forward by the elasticity of the leaf spring (21) attached thereto. ) And the fourth bevel gear 4 is kept separated from the idler 20.

Accordingly, the fifth bevel gear 5 is engaged with the bevel gear 15 located at the outermost side of the idler 20 to rotate the drive shaft 60 at high speed through the bevel gear 51 at the tip, and the drive shaft ( 60 is driven by the rear wheel 110 by rotating the driven bevel gear 50 attached to the hub 101 by the bevel gear 52 formed at the other end.

In the case of continuing to the normal state upon completion of the above-described process, as shown in the above-described process, by converting the conversion lever 70 to the corresponding gear stage, the selective selection of the bicycle 200 according to the road surface or the traveling speed, etc. The gear shift is to be made, the present invention is such that the power is transmitted through the drive shaft 60, the power transmission is made efficiently in the driving process of the bicycle 200, with the power transmission system is simple and long time use Even failures can be prevented.

As described above, the present invention, the driving force of the crank gear assembly 10 is directly transmitted to the rear wheel 110 by the drive shaft 60 to increase the power transmission efficiency, while driving the bicycle smoothly, accordingly In addition, the simple structure has many effects, such as preventing failure or deterioration of function even when used for a long time.

The present invention has been shown and described with respect to a specific preferred embodiment, but the present invention is not limited to the above embodiment, in the field to which the subject innovation belongs without departing from the gist of the subject innovation claimed in the utility model registration claims Any person with ordinary knowledge will be able to make various modifications.

Claims (5)

A crank gear assembly (10) for axially movably coupling a plurality of bevel gears arranged concentrically to the outer circumferential surface of the crank shaft (90); An idler 20 which sequentially stacks the bevel gears meshing with the bevel gears of the crank gear assembly 10 and integrally rotates in contact with any one of the bevel gears of the crank gear assembly; Close contact with the first bevel gear 1, the second bevel gear 2, the third bevel gear 3, the fourth bevel gear 4 and the fifth bevel gear 5 of the crank gear assembly 10, respectively. To press the first bevel gear 1, the second bevel gear 2, the third bevel gear 3, the fourth bevel gear 4 and the fifth bevel gear 5 protruding in the axial direction. Pressing members 30 each having a spring 21 arranged in an arc shape; A housing (40) coupled to the crank gear assembly (10) and the idler (20) and the pressure member (30) to rotatably support the crank shaft (90) and the idler (20); A driven bevel gear 50 attached to one side of the hub 101 coupled to the center of the rear wheel 110 and integrally rotating with the hub 101; The driving force of the crank gear assembly 10 transmitted through the idler 20 by bevel gears 51 and 52 coupled between the idler 20 and the driven bevel gear 50 and formed on both ends of the driven bevel gear. A drive shaft 60 for transmitting to 50; And Both ends are rotatably supported by the housing 10, and each of the conversion levers 70 spirally inserted from both sides of the outer circumferential surface of the pressing ball for pressing both rear sides of each bevel gear of the crank gear assembly 10, respectively. Bicycle drive device. The bevel gear of claim 1, wherein the bevel gear of the crank gear assembly (10) is coupled to the outer circumferential surface of the crank shaft (90) and the second circumferential surface of the first bevel gear (1) rotates by the drive of the crank shaft (90). The bevel gear 2 is movably coupled in the axial direction, and as the outer circumferential surface of the second bevel gear 2, the third bevel gear 3, the fourth bevel gear 4 and the fifth bevel gear 5 are connected. Is sequentially coupled to the bicycle driving device, characterized in that rotates integrally with the first bevel gear (1). The idler (20) of claim 1, wherein the idler (20) includes a first bevel gear (1), a second bevel gear (2), a third bevel gear (3), and a fourth bevel gear (4) of the crank gear assembly (10). And bevel gears (11, 12, 13, 14, 15) meshing with the fifth bevel gears (5), respectively. The method of claim 1, wherein the conversion lever 70, the first bevel gear (1), the second bevel gear (2), the third bevel gear (3), the fourth bevel gear ( 4) and the driving device for a bicycle, characterized in that the combination of the pressing ball (61, 62, 63, 64, 65) for pressing the rear both sides of the fifth bevel gear (5). 5. The bevel gear (1) and the second bevel gear (2) according to claim 1, wherein the conversion lever (70) is provided in the vicinity of the pressing balls (61, 62, 63, 64, 65). 6. And a ball (66) rotatably supporting the third bevel gear (3), the fourth bevel gear (4) and the fifth bevel gear (5).