KR20050088891A - The belt-pulley type continuously variable transmission using fragments of pulley - Google Patents

Abstract

The present invention relates to a continuously variable automatic transmission that can be used to continuously automatic transmission using a plurality of pulley pieces. According to the present invention, the plurality of cranks 30 are rotatable on the fixed plate 20 fixed to the shaft 10, and the pulley pieces 40 are installed on the lower shaft portion 31b of each crank. And by engaging the guide protrusion (40b) formed on the pulley piece 40 and the guide lane (20b) formed on the fixed plate 20, each pulley piece is capable of radial movement while maintaining a constant angle. And by using the connecting means (80, 80 ') and the elastic member (90, 90') a plurality of pulley pieces 40 to move in a radial direction at the same time to make the automatic transmission without end.

The simplest structure of the present invention, the mounting space is small, and the automatic transmission is possible without permission. Therefore, the present invention can be used as a transmission in a bicycle, a motorcycle, a vehicle, an industrial machine, and the like.

Description

Belt-Pulley Type Continuously Variable Transmission Using Fragments of Pulley}

The present invention relates to a continuously variable automatic transmission using a plurality of pulley pieces. Specifically, the transmission is provided with a plurality of pulley pieces to move substantially radially, and the variable speed transmission is made by allowing a plurality of pulley pieces to move at the same time using the elastic member and the connecting means.

A representative example of the continuously variable transmission that is currently commercialized is the Belt-Pulley Type Continuously Variable Transmission. Such a belt-pull type continuously variable transmission is typically composed of a fixed pulley and a moving pulley, and the shift is made by changing the contact distance between the belt and the pulley while the moving pulley moves. Such a belt-pull type continuously variable transmission requires a mounting space of a fixed pulley and a moving pulley, a moving space of a moving pulley, a mounting space of an elastic member or a control device for shifting, and the like. That is, the conventional belt-pull type continuously variable transmission requires a considerably large mounting space. For this reason, the existing belt-pull type continuously variable transmission is difficult to install in a place where a small space such as a bicycle is required.

The present invention is to make a belt-pulley type continuously variable transmission that can be mounted in a small mounting space. To this end, the present invention is equipped with a plurality of cranks rotatable on a stationary plate, and each crank is provided with a rotatable pulley piece. And by engaging the guide protrusion formed on the pulley piece and the guide lane formed on the fixing plate to allow the pulley pieces to move radially while maintaining a constant angle. And by using the elastic member and the connecting means a plurality of pulleys to move in the radial direction at the same time to achieve automatic transmission. Here, the elastic member forces each pulley to move to the edge or the center of the shaft. Then, by using the connecting means, the cranks rotate together at the same angle so that the same load acts on each crank. The continuously variable transmission of the present invention may be installed at either the driving unit and the follower or at either side.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Figures 1a to 1b is a conceptual diagram of the present invention shows a shift principle, Figure 2 is a perspective view showing a coupling relationship between the crank and the pulley piece. 1A illustrates a case in which a shift pulley using a pulley piece is mounted to a driving unit and a follower. 1B illustrates a case in which a transmission pulley using a pulley piece is mounted to a driving unit, a single pulley is mounted to a driven unit, and a tensioner is standing between the driving unit and the driven unit. The main part of the speed change pulley is a shaft 10 including the drive shaft 11 to the driven shaft 12, a fixed plate 20 fixedly mounted on the left and right sides of the shaft 10, and a plurality of cranks 30 rotatable on the two fixed plates. ), And a pulley piece 40 fixedly rotatably supported on the crank. In addition there is provided a resilient member for applying a force to move the plurality of cranks in a constant direction and a connecting means for rotating the plurality of cranks at the same angle. A circular fixed plate 20 is fixedly mounted on the shaft 10 for transmitting power, and a plurality of cranks 30 are rotatably mounted on the fixed plate, and a pulley piece 40 is rotatably mounted on the crank. Specifically, the crankshaft upper portion 31a is rotatably mounted on the fixed plate 20, and the pulley piece 40 is rotatably mounted on the lower crankshaft 31b. And the crank 30 on the left and right are directly connected to each other by the fixing portion (30a). Alternatively, the left crank 30 and the pulley piece may be connected, and the pulley piece and the right crank may be connected to each other. Guide protrusions 40b are formed on one side or both sides of the pulley piece 40, and the guide protrusions are movable in a predetermined direction along the guide lane 20b of the fixing plate 20. The belt 50 is caught by the outer circumferential surface of the plurality of pulley pieces 40. Shifting is achieved by changing the position of multiple pulley pieces. In FIG. 1A a plurality of pulley pieces 40 on the drive shaft 11 are located at the central part, and a plurality of pulley pieces on the driven shaft 12 are located at the edges. This case is a low speed situation in which a large load is applied to the belt 50. In FIG. 1B a plurality of pulley pieces 40 on the drive shaft 11 are located at the edges and the diameter of the pulley 60 on the driven shaft 12 is constant. Therefore, the above case is a high speed situation in which a small load is applied to the belt. In addition, the connecting means and the elastic member is provided in a variety of ways.

3 is a perspective view of an automatic transmission pulley according to a first embodiment of the present invention, Figure 4 is an exploded perspective view of the automatic transmission pulley. In the first embodiment, the gear 81 and the belt 82 are used as the connecting means 80 for rotating each crank 30 to the same angle, and the tension spring 91 is used as the resilient member 90. The main part of the speed change pulley in this embodiment is as described in Figures 1 to 2, this embodiment shows the specific use of the connecting means and the elastic member. Specifically, the fixing plate is fixedly mounted to the shaft by the combination of the fixing part 10a formed on the left and right sides of the shaft 10 and the through hole 20c of the fixing plate 20. Here, the shaft 10 and the fixed plate 20 can be made into a one-piece that can not be disassembled / assembled. The upper shaft portion 31a of the crank 30 is rotatably supported by the plurality of through holes 20d formed in the fixing plate 20 so as to be rotatable, and the pulley piece 40 is disposed on the lower shaft portion 31b of each crank. It is mounted to be rotatable. And the guide protrusion 40b comprised in a part of each pulley piece 40 is guided by the guide lane 20b comprised in the fixing plate 20. As shown in FIG. The connecting means 80 and the resilient member 90 used in the present embodiment may be installed on the upper shaft portion 31a of the left and right cranks 30 or the upper shaft portion of the crank on either side. A gear 81 is fixedly mounted to a part of the upper shaft portion 31a of the crank 30, and a belt 82 is provided on the outer circumferential surface of each gear. Here, the gear 81 may be configured in various shapes according to the structure of the belt 82. For example, when using a chain belt, the gear 81 becomes a chain gear. A resilient member 90 is installed in a portion of the gear 81 fixed on each crankshaft or in the support 83 connected to the gear. In this embodiment, a tension spring 91 is used as the resilient member. The fixing portion 91a of each tension spring 91 is fixed to the fixing portion 83a of the support 83.

5 is a perspective view of an automatic transmission pulley according to a second embodiment of the present invention. Unlike FIG. 4, the wire 84 and the torsion spring 92 are used as the connecting means 80 'and the elastic member 90' in the present embodiment. In the present embodiment, the connecting means 80 'and the resilient member 90' may be installed on the upper shaft portion 31a of the left and right cranks 30, respectively, or on the upper shaft portion of the crank on either side. The wire 84 used as the connecting means 80 'is composed of several wires or one wire. The fixing portion 84a of the wire 84 is fixed to a specific point of the upper shaft portion 31a of each crank 30. An auxiliary ring having a relatively large diameter may be fixedly mounted on the upper shaft portion 31a of each crank 30, and each auxiliary ring may be connected by a wire. The torsion spring 92 is mounted on the upper shaft portion 31a and the fixed plate 20 of the crank 30. One side of the torsion spring 92 is fixed to the fixing portion 20e of the fixing plate 20d, and the other side is fixed to the upper shaft portion 31a of the crank 30, respectively. Here, the crank 30 tries to rotate in a constant direction by the force of the torsion spring 92.

6 is a perspective view of an automatic transmission pulley according to a third embodiment of the present invention. One fixing plate 20 is fixedly mounted on the shaft 10, and a plurality of cranks 30 are rotatably supported on the fixing plate. In the previous embodiment, the fixing plate and the crank are configured symmetrically, but in this embodiment, they are not symmetrically configured. The crank 30 and the pulley piece 40 are installed on one side of the fixing plate 20, and the connecting means 80 and the elastic member 90 are installed on the opposite side. This embodiment can be used when the CVT is mounted in a very narrow space.

The continuously variable transmission of the present invention may have a large transmission ratio as a simple structure and, above all, may be installed in a narrow space. Therefore, the continuously variable transmission of the present invention may be one model that can replace the existing transmission, and may be particularly useful for bicycles and motorcycles that require mounting of the transmission in a narrow space.

1 is a conceptual diagram of the present invention

2 is an exploded perspective view of the crank and pulley pieces;

3 is a perspective view of an automatic transmission pulley according to the first embodiment of the present invention;

Figure 4 is an exploded perspective view of an automatic transmission pulley according to the first embodiment of the present invention

5 is a perspective view of an automatic transmission pulley according to a second embodiment of the present invention;

6 is a perspective view of an automatic transmission pulley according to a third embodiment of the present invention.

(Explanation of drawing)

10. Axis 10a. Fixed part 11.Drive shaft

12. Follower 20. Mounting plate 20a. Body

20b. Guidelane 20c. 20d. Through-hole 20e. Fixture

30. Crank 31. Crankshaft 31a. Upper Shaft

31b. Lower Shaft 32. Crank Arm 40. Pulley

40a. Body 40b. Guide protrusion 40c. Fixing hole

50. Belt 60. Pulley 70. Tensioner

71. Shaft 72. Pulley 80. 80'.Connection

81.Gear 82.Belt 83.Brace

83a. Fixture 84. Wire 84a. Fixture

90. 90 '. Elastic member 91. Tension spring 91a. Fixture

92. Torsion springs 92a. Fixture

Claims (9)

In continuously variable transmission with belt Gearbox A shaft 10 for transmitting power; A fixed plate 20 fixedly mounted to the shaft 10, the plurality of guide lanes 20b being formed in a substantially radial shape; A plurality of cranks 30, the main part of which is supported by the fixing plate 20 so that the upper shaft portion 31a is rotatably fixed, the crankshaft 31 and the crank arm 32; A plurality of pulley pieces 40, on which a guide protrusion 40b is formed, which is fixedly rotatably supported on the lower shaft portion 31b of each crank 30; Connecting means (80) installed on a portion of the upper shaft portion (31a) of each crank (30) to allow each crank to rotate together at a constant angle; An elastic member 90 installed on a portion of the upper shaft portion 31a of the crank 30 to apply a force to each crank in a predetermined direction; Consists of The guide pulley 40b of the pulley piece 40 is guided to the guide lane 20b formed in the fixing plate 20, using a pulley piece belt-type pulley type continuously variable transmission. In claim 1 Belt-pulley type continuously variable transmission using a pulley piece composed of one fixed plate 20 fixedly mounted on a shaft 10. In claim 1 Belt-pulley type continuously variable transmission using a pulley piece, which consists of two left and right fixed plates 20 fixedly mounted on a shaft 10. In claim 1 Belt-pulley type continuously variable transmission using a pulley piece in which bearings are installed at the contact portion between the fixed plate 20 and the crank 30. In claim 1 Connecting means (80) provided in a part of the upper shaft portion (31a) of each crank 30 A belt-pull type continuously variable transmission using a pulley piece, which is composed of "a gear 81 on which a gear tooth is formed, a belt 82 meshing with the gear 81", and the like. In claim 1 Connecting means (80) provided in a part of the upper shaft portion (31a) of each crank 30 "Gear 81 fixed to the upper shaft portion 31 of each crank 30; Belt-pulley type continuously variable transmission using a pulley piece consisting of a belt 82 " and the like engaged with the outer circumferential surface of the gears 81. In claim 1 Connecting means (80) provided in a part of the upper shaft portion (31a) of each crank 30 Belt-pulley type continuously variable transmission using a pulley piece, consisting of a "wire 84 connecting and fixing the upper shaft portion 31 of each crank 30". In claim 1 The elastic member 90 is installed on a part of the upper shaft portion 31a of the crank 30 &Quot; Auxiliary support 83 in various ways fixedly mounted to the upper shaft portion of each crank 30; Belt-pulley type continuously variable transmission using pulley pieces, consisting of a tension spring 91 " In claim 1 The elastic member 90 is installed on a part of the upper shaft portion 31a of the crank 30 Belt-pulley type continuously variable transmission using pulley pieces, consisting of "torsion springs 92 mounted to the upper shaft portion of each crank 30".