KR20020029044A - Automatic continuously variable transmission using the tension change of the chains - Google Patents

Abstract

PURPOSE: An automatic continuously variable transmission using tension change of a chain is provided to apply the automatic continuously transmission to a bicycle or a motorcycle. CONSTITUTION: Coupling of sub chain gears(10) and drive links(5,6) are formed in plurality. The plural couplings are coupled to circular links(2,8) and a shaft holder(1) by plural connecting links(3,7) and interlocked. The shaft holder and the drive link(5) have each projection for fixing(1a,5c) to constrain the rotating range of the drive links(5,6) and the drive link(6) has a projection for fixing to constrain the rotating range of a ratchet(9). The ratchet prevents the sub chain gear from rotating in the direction of power transmission. A spring(12) restores the position of the ratchet. A tension spring(11) changes the diameter of pitch circles made by the sub chain gears according to the tension change of the chain.

Description

Automatic continuously variable transmission using the tension change of the chains}

The present invention relates to an automatic continuously variable transmission, and the transmission means a device for variably outputting input power. The gearbox can be divided into manual and automatic according to its control method. The manual control method is a method in which the driver directly controls the gearbox. In the automatic control method, the gearbox automatically judges the situation and automatically shifts without the driver's intervention. Is controlled. In addition, it is divided into stepped and stepless according to the type of the output variable by the transmission. The stepped transmission is equipped with various transmission gears, so the transmission ratio is selective and power transmission is not linear at the time of transmission. On the other hand, the continuously variable transmission mainly uses variable belt pulleys and belts, and thus the power transmission is linear.

The conventional automatic continuously variable transmission uses a variable belt pulley and a belt for continuously variable transmission, which has a problem in that power transmission is difficult due to slippage between the belt pulley and the belt when a relatively large power is transmitted. In addition, there is a problem in that a separate electronic control system must be provided to control the transmission. In addition, the conventional automatic continuously variable transmission has a disadvantage in that its size is difficult to apply to a bicycle or a motorcycle.

An object of the present invention is to provide an automatic continuously variable transmission apparatus that can be applied to a bicycle or a motorcycle by solving the above problems.

The automatic continuously variable transmission of the present invention for achieving the above object is coupled to a plurality of electric links in a radial shape to the shaft holder, instead of the belt pulley which is a component of the conventional variable continuously variable transmission and the sub chain gear at the end thereof. It is installed structure. In addition, the ratchet is installed on one side of the electric link so that the sub chain gear can transmit power in only one direction, and the electric link is inward of the shaft holder in a state in which power is not transmitted by connecting the electric link and the shaft holder with a spring. It has a structure that is always folded and the tension of the spring installed so that the electric link can be folded into the shaft holder is a structure that can be changed according to the requirements of the device to which the present invention is applied.

Such a structure of the present invention has the advantage that the size is small and transmits power by using a chain rather than a belt has the advantage that can transmit a greater power than the belt and does not have a sliding phenomenon during power transmission. In addition, there is an advantage that the shift is automatically made according to the tension change of the chain even without a separate electronic control device.

Therefore, the automatic continuously variable transmission according to the present invention is particularly easy to apply to bicycles and motorcycles, and can be applied to transmissions of various power transmission devices.

1 is a simple installation example of the transmission (D) according to the present invention

2 is a front view, a sectional view, and a pitch circle diameter value of the transmission D according to the present invention.

State diagram

3 is an initial state diagram of a transmission D according to the present invention.

4 is an exploded perspective view of the shaft holder (1) and the circular link (2)

5 is a perspective view of the connecting link (3)

6 is a perspective view of the connecting link (5)

7 is a perspective view of the connecting link 6

8 shows the ratchet 9 and the spring 12 installed in the electric link 6 and the sub-chain gear.

9 is a perspective view of the reinforcing link (4)

10 is a perspective view of a circular link 8

11 is a perspective view of the connecting link 7

12 is a front view and a side view of the tension spring 11

* Explanation of Signs of Major Parts of Drawings *

A: Chain gear B: Chain

C: tension regulator D: transmission

1: shaft holder 1a: locking jaw

1b: hole 1c: mating surface

2: circular link 2a: hole

3: connecting link 3a, 3b: hole

4: reinforcing link 4a, 4b: hole

5: transmission link 5a, 5b: hole

5c: engaging jaw 6: electric link

6a, 6b, 6d: hole 6c: locking jaw

7: connecting link 7a, 7b: hole

8: circular link 8a: hole

9: Ratchet 10: Subchain Gear

10a: center hole of sub-chain gear 11: tension spring

11a, 11b: both ends of the tension spring 12: spring

Hereinafter, with reference to the accompanying drawings showing an embodiment of the present invention will be described in detail the configuration and operation.

1 is an exemplary view showing a simple installation example of the transmission (D) according to the present invention, the configuration is a chain gear (A) receiving the initial driving force and the chain (B) for transmitting the driving force to the transmission (D). ) And a tension controller (C) and a shift controller (D) to maintain the tension of the chain (B). The chain gear (A), the tension regulator (C) and the chain (B) is generally widely used and the description of the structure thereof is omitted.

Hereinafter, the structure and the principle of operation of the transmission (D) will be described in detail.

4 is an exploded perspective view of the shaft holder (1) and the circular link (2), the shaft holder (1) that can be connected to the output shaft is a shaft holder (1) to be rotatable independently of the donut-shaped circular link (2) It is coupled to the coupling surface (1c) of the), the circular link (2) is a plurality of holes (2a) are drilled radially at a constant distance and a constant interval around the rotation axis. 5 is a perspective view of the link 3, the hole (3a) drilled in the link link (3) has a structure rotatably coupled to the hole (2a) drilled in the circular link (2).

6 is a perspective view of the electric link 5, the hole (5a) drilled in the electric link (5) is a plurality of radially drilled on the surface of the groove having the locking jaw (1a) of the shaft holder (1) in FIG. Each of the transmission links 5 are axially coupled to the holes 1b to have an arbitrary rotation range, and the holes 5b drilled in the transmission links 5 are formed by holes 6a drilled in the transmission links 6 in FIG. The shaft has a structure in which the transmission link 6 can rotate. In addition, as shown in FIG. 6, the engaging link 5c is also formed on the surface of the transmission link 5 to be coupled with the transmission link 6, so that the transmission link 6 also has an arbitrary rotation range. In FIG. 7, the inner side of the electric link 6 has a locking jaw 6c formed to restrain the rotation range of the ratchet 9, the ratchet 9 is coupled to the hole 6d, and the ratchet ( The spring 12 is installed together to restore the position of 9). 8 is a partial coupling diagram of the ratchet 9 and the spring 12 and the sub chain gear 10 installed in the transmission link 6. In FIG. 8, the hole 10a of the subchain gear 10 is axially coupled to the hole 6b of the electric link 6 shown in FIG. 7 so that the subchain gear 10 can rotate, and the direction of rotation thereof. Has a structure that can only rotate in the opposite direction of the power transmission direction of the chain (B) by the ratchet (9) and the spring 12 coupled to the transmission link (6).

The shaft which combined the ratchet 9 and the electric link 6 is connected with the hole 3b of the connection link 3 shown in FIG. That is, the connection link 3 connects the electric link 6 and the circular link 2 so that the rotational motion of the plurality of electric links 6 can be linked with the rotational motion of the circular link 2. It serves to uniformize the rotational movement of the electric link (6). On the opposite side of the surface where the sub chain gear 10 and the ratchet 9 engage with the electric link 6, the holes 4a and 4b drilled in the reinforcing link 4 of FIG. 9 are connected to the rotating shaft of the sub chain gear 10. Coupling to the rotary shaft of the ratchet (9), respectively. That is, the reinforcing link (4) serves to reinforce the shaft coupling of the electric link (6), sub-chain gear (10) and ratchet (9).

The circular link 8 of FIG. 10 is for uniformizing the rotational movement of the plurality of transmission links 5, the circular link 8 and the transmission link 5 is axially coupled to the connection link (7). That is, in FIG. 11, the hole 7a drilled in the link link 7 is axially coupled to the plurality of holes 8a drilled in the circular link 8, and the hole 7b drilled in the link link 7 has a plurality of transmissions. The rotational movement of the transmission link 5 is axially coupled with the hole 5b of the link 5 and interlocked with the circular link 8.

The tension spring 13 of FIG. 12 has the rings 11a and 11b provided at both ends thereof connected to the holes 6d of the electric link 6 and the holes 1b drilled in the shaft holder 1, respectively. Since the connection with the hole 1b drilled in the shaft holder 1 or the number of installation thereof can be selectively made, the transmission of the transmission D according to the change in the tension of the chain B by changing the tension of the tension spring 11 is changed. The operating point can be adjusted.

The transmission link 5 can be omitted from the components of the present invention and the circular link 8 and the connection link 7 are omitted. At this time, the hole 6a of the electric link 6 is axially coupled to the hole 1b of the shaft holder 1, and the shift principle of the transmission device to be implemented in the present invention is the same, and only to the subchain gear 10. There is a change in the maximum or minimum value of the pitch circle diameter, which is the path of the chain B, and the range of the transmission ratio changes.

Referring to the operation of the transmission (D) of the present invention configured as described above is as follows.

In FIG. 1, the chain gear A, which first receives the driving force from the power source, transmits the driving force to the transmission D via the chain B. As shown in FIG. 3 shows the transmission D in the initial state, in which the chain B is not transmitting any power, and the sub-chain gear 10 is connected to the central shaft of the shaft holder 1 by the tension spring 11. It is retracted in the direction. FIG. 2 is a diagram showing a case where the diameter of the pitch circle made by the plurality of sub-chain gears 10 is maximized by operating the transmission device D. In FIG. 3, driving force is applied to the chain gear A in the initial state of FIG. When the driving force is transmitted to the transmission (D) through the chain (B) and the transmission (D) is rotated about the central axis of the shaft holder (1).

At this time, when a load is applied to the shaft holder 1, tension is generated in the chain B that transmits the driving force, and a plurality of tension springs 11 of which the magnitude of the tension generated in the chain B is installed in the transmission D are provided. If greater than the tensile force of the transmission link (D) of the transmission link (5) and the transmission link (6) is to be opened outward from the central axis of the shaft holder (1). Therefore, the movement path of the chain B, which is produced by the plurality of subchain gears 10, that is, the pitch circle diameter is increased and the transmission D is shifted and rotated. In this state, when the tension of the chain B decreases again and becomes smaller than the tensile force of the tension spring 11, the transmission link 5 and the transmission link 6 are in the center axial direction of the shaft holder 1 of the transmission D. To be retracted. Therefore, the movement path of the chain B produced by the plurality of chain gears 10, that is, the pitch circle diameter becomes small, and the transmission D is shifted and rotated. In addition, since the length of the tension spring 11 is changed and the transmission device D is changed in proportion to the tension of the chain B, the transmission device according to the present invention has an automatic continuously variable speed function.

Since the automatic continuously variable transmission according to the present invention as described above uses a chain, it can transmit a relatively larger force than the continuously variable transmission transmitting power using a belt, and the torque and rotation speed of the output power are linear. It is changed by enemy. And, even if there is no separate electronic control device for shift control, the gear is automatically shifted according to the tension change of the chain. Since the size of the gear is smaller than the existing gear, it is automatically applied to bicycles or motorcycles to make continuously variable shifts. can do.

Claims (3)

Sub chain gear 10 is formed of a plurality of shaft coupling with the electric link (5,6), a plurality of the formed circular link (2, 8) and the shaft by using a plurality of connecting links (3,7) A shaft coupled to the holder (1) in the axial coupling and interlocking, the shaft holder (1) and the electric link (5) is coupled to the locking jaw (1a, which can constrain the rotation range of the electric link (5, 6), respectively) 5c), the transmission link 6 also has a locking jaw (6c) that can restrain the rotation range of the ratchet (9), the sub-chain gear 10 in the power transmission direction of the chain (B) A ratchet 9 for preventing rotation and a spring 12 for restoring the position of the ratchet 9 are provided, and the pitch circle diameters made by the subchain gears 10 are changed in accordance with the tension change of the chain B. FIG. Automatic continuously variable transmission that is installed tension spring (11). The method according to claim 1, characterized in that the engagement position of the tension spring 11 and the number of installation thereof can be selectively changed so that the total tension of the tension spring 11 installed in the transmission D can be changed. Gearbox. 2. The transmission link (5) and the connection link (7) and the circular link (8) installed in the transmission (D) according to claim 1 are selectively removed and added in accordance with a desired transmission ratio so as to be linked with other links. Automatic continuously variable transmission, characterized in that can be assembled.