KR100586631B1 - A transmission for bicycle - Google Patents

Abstract

The present invention relates to a continuously variable transmission for a bicycle using a variable pulley connected to a V-belt, and more particularly smooth and accurate shifting without damage and resistance of the V-belt by a pair of variable pulleys are made small in order to operate inversely simultaneously. As well as possible, the present invention relates to a continuously variable transmission for a bicycle so that a smooth shift can be made even when the bicycle is stopped.

The present invention is a pair of drive, driven sprocket rotatably installed on both ends of one support; A pair of drive and driven shafts coupled to the drive and driven sprockets and rotatably coupled to an end plate at one end thereof through a rotating ball; A pair of transfer sleeves penetrately coupled to both ends of the driving and driven shaft support members; A pair of screw shafts screwed to the conveying sleeve and integrally screwed with a ball casing in which an end plate and a rotating ball are inserted into a support plate at one end; A pair of driven and driven vehicles that allow automatic transmission by means of a variable pulley which is inversely coupled to the drive and driven shaft and operates in inverse proportion; A rotary casing integrally coupled to the variable pulley and one side rotating end rotatably coupled to an outer side of the transfer sleeve; It is made by providing a shift force generating means for supplying a shift force to the screw shaft using the rotational power of the motor.

Description

Continuous transmission for bicycles {A transmission for bicycle}

1 is a front view of a state in which the continuously variable transmission of the present invention mounted on a bicycle

2 is a rear view of a stepless speed change apparatus of the present invention mounted on a bicycle;

Figure 3 is a plan view of the connection state of the present invention continuously variable transmission with the speed generating means

4 is a plan sectional view showing the internal structure of the present invention continuously variable transmission.

Figure 5 is an operating state of the variable pulley by the transfer of the present invention conveying sleeve

Figure 6 is an enlarged cross-sectional view of the coupling state of the present invention screw shaft and feed sleeve

7A is a cross-sectional view taken along the line A-A of FIG.

       (B) is sectional drawing along the line B-B of FIG.

Figure 8 is an example of an installation state of the tension pulley of the present invention

9 is an explanatory diagram of a shift ratio change state according to the present invention;

[Explanation of symbols on the main parts of the drawings]

1,1a: Support 7: Crank Sprocket

10: driving sprocket 10a: driven sprocket

20: drive shaft 20a: driven shaft

21,31,78: spline 23,33: rotating ball

30,30a: Feed sleeve 40,40a: Screw shaft

42: ball casing 50: motor vehicle

50a: driven car 51, 51a: fixed pulley

52, 52a: Variable pulley 53: V belt

60, 60a: rotary casing 62: rotary end

70: shift generating means 71: motor

73: worm gear 74: worm wheel

76: clutch 80: tension pulley

The present invention relates to a continuously variable transmission for a bicycle using a variable pulley connected to a V-belt, and more particularly smooth and accurate shifting without damage and resistance of the V-belt by a pair of variable pulleys are manufactured in small size to operate inversely simultaneously. As well as possible, the present invention relates to a continuously variable transmission for a bicycle so that a smooth shift can be made even when the bicycle is stopped.

In general, as an example of the continuously variable transmission, a transmission using a pair of variable pulleys connected by a V belt has been proposed.

In this case, the transmission horsepower is assumed to be less than 2 horsepower, and the thickness of the belt is manufactured to about 12.5mm as the standard belt type A, and the effective diameter of the pulley contacting the belt is selected to at least 50mm.

Based on this, in order to make the speed ratio of general bicycles about 4: 1, the maximum diameter of a pair of variable pulleys must be made larger than 200mm, and the contact angle between the belt and the pulley groove (the inner angle of the standard belt surface is 40˚, and the pulley The cabinet is 34 degrees, compared to 10 degrees) is very small.

Therefore, varying the pulley with a large diameter while compressing a V-belt with a very high frictional resistance to the above-mentioned small contact angle, in fact, narrows the distance between the two pulleys to a distance of 12.5 mm while compressing the belt, and has a diameter of 200 mm at a diameter of 50 mm In this case, considerable force is required in shifting, which inevitably causes damage or wear of the drive and the belt of the variable pulley.

Therefore, the conventional continuously variable transmission using the two variable pulleys and the V-belt is just a theoretical matter in practical use when installed on a bicycle and could not be realized.

The present invention is to solve the above problems, to make a continuously variable transmission having a transmission ratio of about 2: 1 to 1: 2 in a compact to facilitate installation on the bicycle, the continuously variable transmission is inversely proportional to the simple operation A pair of variable pulleys that are operated simultaneously simultaneously enables smooth shifting at a speed ratio of about 4: 1 to 1: 1 without damage to the belt and resistance, and also enables shifting even when the vehicle is stopped. The main purpose of the invention is to maintain the airtightness of the main components from foreign matter, etc. to ensure flexibility and accuracy at the time of shifting, and to improve durability.                         

The present invention for achieving the desired object is connected between the crank side sprocket of the existing bicycle and the drive sprocket of the continuously variable transmission having a 2: 1 speed ratio, and then the speed ratio of the continuously variable transmission is about 2: 1 to 1: 2. Although the total speed ratio of the bicycle is about 4: 1 to 1: 1, it is possible to reduce the size of the gearbox, so it is very easy to install and the belt and the variable pulley that make up the continuously variable transmission are standard dimensions. It can be manufactured close to, so it works smoothly without straining the belt.

Furthermore, the pair of variable pulleys can be precisely inversely proportional to each other using a feed force by screwing to achieve smooth and smooth shifting, and can provide a continuously variable transmission for a bicycle that can be shifted even when the bicycle is stopped. .

Hereinafter, the configuration of the preferred embodiment for effectively achieving the object of the present invention will be described.

The configuration of the present invention penetrates a pair of driving, driven sprockets 10 and 10a rotatably installed at both ends of one support 1 as shown in FIGS. 3 to 4, and the driving and driven sprockets 10 and 10a. A pair of drive, driven shaft 20, 20a coupled to the end plate 22 of the one end is rotatably coupled via the rotating ball 23, the other side of the drive, driven shaft 20, 20a A pair of transfer sleeves 30 and 30a penetrately coupled to both ends of the support 1a, and the end plate 22 and the rotary ball are screwed to the transfer sleeves 30 and 30a and supported on one side of the support plate 41. The ball casing 42 into which the 33 is interpolated is coupled to the pair of screw shafts 40 and 40a, which are integrally screwed together, and the drive and driven shafts 20 and 20a are operated in a semi-proportional manner. A pair of motive, driven cars 50, 50a, and the variable pulleys 52, 52a, which are capable of automatic transmission by the variable pulleys 52, 52a, are integrally coupled to one side of the rotary end 62. Other than transfer sleeve 30, 30a Rotational casing (60) and (60a) rotatably coupled to the rotational force generating means 70 for supplying a transmission force to the screw shaft (40, 40a) by using the rotational power of the motor (71). It can be seen.

It will be described in more detail to enable the configuration of the present invention made of the schematic configuration.

First, the support 1 on one side connected to a predetermined portion of the frame 3 of the bicycle 2 has a pair of rotational support portions 4 formed at both ends, and the rotational support portion 4 is driven and driven sprocket 10 ( A pair of bearings 5 which rotatably support 10a) are imparted.

Therefore, the driving and driven sprockets 10 and 10a may be coupled to the bearing 5 so as to be rotatable, and the bearing 5 is prevented from being separated by the snap ring 6.

Here, the driving sprocket 10 is connected to the crank sprocket 7 and the chain 8 so as to receive the driving force by the crank sprocket 7 of the bicycle 2, as shown in Figure 1, wherein the crank sprocket 7 is driven The sprocket 10 is connected to have a gear ratio of about 2: 1, while the driven sprocket 10a is connected to the rear wheel shaft 2c to supply the driving force shifted to an appropriate state to the rear wheel 2a side of the bicycle 2. Connected by a chain (8).

The pair of driving and driven shafts 20 and 20a is driven on one side by a spline 21 inside the boss of the driven sprocket 10 and 10a and the end plate 22 is integrally connected to the other end. The inner and outer sides of the end plate 22 are rotatably supported inside the ball casing 42 through the rotating ball 23.

One side of the pair of transfer sleeves 30 and 30a is coupled to the splines 31 at both ends of the support 1a positioned at the other side of the driving and driven shafts 20 and 20a. (30a) is a screw hole 32 is formed in the inner center and the outward flange 34 for preventing the rotating ball 33 for supporting the rotation of the casing 60, 60a to the outside is separated to the outside Is formed.

The pair of screw shafts 40 and 40a, which are screwed to the transfer sleeves 30 and 30a, provide a transfer force to the transfer sleeves 30 and 30a, and the screws of the transfer sleeves 30 and 30a. Screwed to the hole 32 and the ball casing 42 is integrally screwed to the support plate 41 of one end.

Here, when any one of the screw shaft 40 of the screw shaft 40 (40a) is coupled to the feed sleeve 30 and the right screw, the other screw shaft 40a is left to the other feed sleeve (30a) By being coupled, the pair of conveying sleeves 30 and 30a are rotated inversely inversely in the opposite directions by the screw shafts 40 and 40a when the screw shafts 40 and 40a rotate. Automatically adjust the shift in 52a).

In addition, the screw coupling portion is precisely processed to have a very small pitch and heat treatment is applied to give a large feed force, it is excellent in durability.

The ball casing 42 is a drive, driven by the rotating ball 23 for supporting the rotating shaft 20, 20a, the inward flange 43 is formed at one end and penetrates the inward flange 43 And the end plate 22 of the driven shaft 20 and 20a is fitted and the rotary ball 23 is formed at the end of the screw shaft 40 and 40a facing the end of the end plate 22. A plurality of radially interposed between the 23a and the end plate 22 and the inward flange 43 is installed, the drive, driven shaft 20, 20a can be rotated smoothly.

On the other hand, while driving inversely in proportion to the drive, driven shaft (20) (20a), a pair of motive, driven vehicle (50) (5a) to enable automatic transmission of the bicycle (2) is fixed pulley (51) (51a) ) And a variable pulley (52) (52a), and the fixed pulley (51) (51a) and the variable pulley (52) (52a) is effective to take the V-belt 53 while going to the center in the facing portion An inclined surface 54 is integrally formed so that the diameter gradually decreases, and the fixed pulleys 51, 51a and the variable pulleys 52, 52a are driven and driven by the spline 21 on the driven shafts 20, 20a. Combined through.

At this time, the fixed pulleys 51 and 51a are always driven and rotated in the same direction as the driven shafts 20 and 20a, but both sides are driven by the snap ring 6 and fixed to the driven shafts 20 and 20a. No slip in the axial direction is caused by the

On the contrary, the variable pulleys 52 and 52a are coupled to the driving and driven shafts 20 and 20a in a flow state, and are driven and driven according to the rotation of the screw shafts 40 and 40a. While riding inversely opposite to each other in the ride, the V-belt 53 can be continuously shifted by automatically changing the effective diameter of the driven, driven vehicle 50, 50a.

Meanwhile, the rotary casings 60 and 60a integrally coupled to the variable pulleys 52 and 52a transmit the variable force due to the rotation of the screw shafts 40 and 40a to the variable pulleys 52 and 52a. It acts as a medium and at the same time, the coupling part of the conveying sleeve 30, 30a and the screw shaft 40, 40a from various external factors (rain, dirt, dirt, etc.) and the drive shaft 20 and the screw shaft 40 ( It serves to protect the main components such as the close rotating part of 40a) and guarantees smooth operation and durability, and the uncertainty of shifting, which is a disadvantage of the chain-type multi-speed transmission used in the past, separation of the chain and troublesome operation by both hands. This eliminates the problem of the inability to shift when the bicycle is stopped.

The rotary casing (60) (60a) is integrally coupled to one side of the variable pulleys (52) (52a) by the fastener 61, the rotary end portion 62 is formed on the other side of the coupling portion and the rotary end portion (62) Is rotatably coupled via a plurality of rotary balls 33 installed radially in the ball groove (33a) formed on the inside, the outside in a state fitted to the outside of the transfer sleeve (30) (30a), the rotating ball ( 33, the nut 65 is screwed in a state in which the racing 64 is fitted to the outside of the conveying sleeve 30 and 30a to prevent it from escaping to the outside.

The length of the rotary casing (60) (60a) is secured enough distance to move in the axial direction by the thickness distance of the V-belt (53) when interlocked by the transfer sleeve (30) (30a) of the V-belt (53) Even when the transfer sleeves 30 and 30a are transported on the screw shafts 40 and 40a during the change, they can be smoothly transferred without colliding with the ball casing 42.

That is, the conveying sleeves 30 and 30a are not coupled to each other by the splines 31 through the support 1a so that rotation does not occur, whereas the conveying sleeves 30 and 30a are opposite to each other by the pitch per rotation according to the rotation of the screw shafts 40 and 40a. Inversely moving and the maximum movement distance is the same as the thickness of the V-belt 53 is connected to the driven, driven car 50, 50a.

On the other hand, the shift force generating means 70 for providing a shift force to the screw shaft 40 (40a) is a worm gear 73 is installed on the motor shaft 72 of the motor 71 for generating a rotation force as shown in FIG. The worm gear 73 is meshed with the worm wheel 74 to be able to transfer the rotational power of the morpher 71 to the rotation shaft (75). Here, between the rotary shaft 75 and the worm wheel 74, a clutch 76 for selectively intermittently driving the rotary shaft 75 is installed, the rotary shaft 75 is a screw shaft 40 and the chain (8) By being connected to the rotary power by the motor 71 is supplied to the screw shaft (40).

In addition, the screw shaft 40 and the other screw shaft 40a, respectively, driven and driven sprockets 77 and 77a are coupled through the spline 78 to perform independent slip by half of the thickness of the V belt 53. The driving and driven sprockets 77 and 77a may be connected to the chain 8 to selectively supply the shifting force to the screw shafts 40 and 40a by using the rotational power of the motor 71. Will be.

In addition, the V-belt 53 for power transmission is connected to the driven and driven vehicles 50 and 50a, and a tension for adjusting the tension of the V-belt 53 in the center of the V-belt 53 as shown in FIG. The pulley 80 and the spring 81 are installed.

It will be described for the operating state of the subject innovation made in this configuration.

When shifting the motor 71 first, the rotational force of the motor 71 is simultaneously supplied to the pair of screw shafts 40 and 40a through the transmission of the rotation shaft 75 and the chain 8 to the screw shaft 40 ( 40a) will rotate simultaneously.

At this time, the pair of screw shafts 40 and 40a are coupled to the conveying sleeves 30 and 30a by different right and left screws, so that the screw sleeves 40 and 40a are rotated in the same direction. 30a) is conveyed in axial directions opposite to each other.

In addition to the transfer of the transfer sleeves 30 and 30a, the rotating casings 60 and 60a simultaneously move the variable pulleys 52 and 52a in inverse proportion.

Therefore, the effective diameter of the V-belt 53 connected to the driven and driven vehicles 50 and 50a is simultaneously changed in inverse proportion. At the same time, the driven and driven vehicles 50 and 50a are connected to the V-belt 53. Driven by tension, slip is simultaneously applied to the spline 21, 31 and 78 joints together with the driven shafts 20, 20a, the screw shafts 40, 40a, and the conveying sleeves 30, 30a. As it occurs, the straight line is maintained as in the V belt 53.

The present invention has a small change in tension as the pair of driven and driven vehicles (50) (50a) are simultaneously inversely changed at the same time, even when the bicycle is stopped, by stepping on the pedals of the bicycle and rotating the crank sprocket (7) in reverse. As shown in FIG. 9, the gear ratio can be freely adjusted to have a gear ratio of 4: 1 to 1: 1.

On the other hand, the continuously variable speed according to the present invention, by connecting the clutch 76 in the direction of the worm wheel 74, can be automatically adjusted by the driving force of the motor 71, as well as when the motor 71 is broken, as shown in Figure 3 cable (75a) By connecting the connected handle in the direction of the rotating shaft 75, the manual rotation of the handle through the rotation of the rotating shaft 75, the manual adjustment is possible.

According to the present invention, a pair of variable pulleys simultaneously operated inversely through simple operation enables smoothly continuously shifting at a speed ratio of about 4: 1 to 1: 1 without damaging and resisting the belt.

In addition, it is manufactured in a small size that can satisfy the specificity of the bicycle is easy to install, as well as shifting even when the stop.

In addition, by maintaining the confidentiality of the main components from external factors (dust, foreign matters, etc.), while ensuring flexibility and accuracy in shifting, durability is improved, and shift uncertainty, chain breakage, and both hands, which are disadvantages of the conventional chain-type multi-speed transmission There is an effect to solve the problems such as inconvenience caused by the operation.

Claims (6)

A pair of driving and driven sprockets 10 and 10a rotatably installed at rotation supports 4 at both ends of one support 1; The driving, driven sprocket (10) (10a) and a pair of drives that are coupled through the spline (21) and rotatably supported inside and outside the end plate (22) of one end by the rotation ball 23, Driven shafts 20 and 20a; A pair of transfer sleeves 30 and 30a which are penetrated by splines 31 at both ends of the driving and driven shafts 20 and 20a and on the other side of the support 1a, and formed in a screw hole 32 in the center thereof; The rotating ball 23 is screwed to the screw hole 32 and driven to the outward flange 34 of one end, and rotationally supporting the end plate 22 and the end plate 22 of the driven shaft 20, 20a A pair of screw shafts 40 and 40a to which the interlocked ball casing 42 is screwed; A pair of fixed pulleys 51 and 51a and variable pulleys 52 and 52a are coupled to the driving and driven shafts 20 and 20a by a spline 21 and the variable pulleys 52 and 52a. The driving, driven shaft (20) (20a) and a pair of motive, driven car (50) (50a) to enable automatic transmission while inversely transported; A pair of rotary casings integrally coupled to the variable pulleys 52 and 52a and one side rotating end 62 are rotatably coupled to the outside of the transfer sleeves 30 and 30a via a rotary ball 33. 60) 60a; A pair of driven and driven sprockets 77 and 77a connected to the screw shafts 40 and 40a by a chain 8 is penetrated and coupled to the spline 78, and the driven sprocket 77 is connected to the motor 71. Stepless speed change device for a bicycle, characterized in that consisting of a shift force generating means 70 for supplying a shift force to the screw shaft (40) (40a) by using rotational power. The method according to claim 1, When the screw shaft (40) (40a) is any one screw shaft 40 is coupled to the transfer sleeve 30 with the right screw, the other screw shaft (40a) is coupled to the other transfer sleeve (30a) with the left hand screw When the screw shafts 40 and 40a are rotated, a pair of the conveying sleeves 30 and 30a ride on the screw shafts 40 and 40a inversely inversely in different directions, so that the variable pulleys 52 and 52a Continuously variable speed gear for bicycles, characterized in that automatically adjust the shift. The method according to claim 1, The shift force generating means 70 includes a worm gear 73 rotating by the motor 71 and a worm wheel 74 meshing with the worm gear 73 to transmit rotational power of the motor 71 to the rotation shaft 75. A clutch 76 is installed between the rotary shaft 75 and the worm wheel 74 to selectively control the rotational drive of the rotary shaft 75, and a chain for transmitting the power of the rotary shaft 75 to the screw shaft 40. Stepless transmission for bicycles, characterized in that consisting of (8). The method according to claim 1, The V-belt 53 connected to the driven and driven vehicle 50 and 50a is simultaneously inversely proportional to the effective diameter of the V-belt 53 being applied by the variable pulleys 52 and 52a which are inversely operated. On the other hand, the driven, driven vehicle 50, 50a is driven by the tension of the V belt 53, driven shaft 20, 20a and screw shaft 40, 40a, transfer sleeve 30, 30a Along with the spline (21) (31) (78) and at the same time the slip occurs at the same time the stepless transmission device for bicycles, characterized in that the straight line is maintained as the V-belt (53). The method according to claim 1, The driving sprocket 10 is connected to the crank sprocket 7 and the chain 8 so as to receive the driving force by the crank sprocket 7 of the bicycle 2, while the driven sprocket 10a is adapted to the driving force shifted to an appropriate state. A continuously variable transmission for a bicycle, characterized in that connected to the rear wheel shaft (2c) and the chain (8) to supply to the rear wheel (2a) of the bicycle (2). The method according to claim 3, The clutch 76 can be automatically shifted by the driving force of the motor 71 when connected in the direction of the worm wheel 74, while the rotation shaft 75 is operated by manual operation of a handle to which the cable 75a is connected when connected to the rotation shaft 75 direction. ) Continuously variable speed transmission for bicycles, characterized in that manual rotation is possible.

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