JPS60132160A - Centrifugal, belt-driven automatic stepless transmission for vehicle - Google Patents

Abstract

PURPOSE:To provide a compact nonstage speed change gear with a reduced rolling load by disengaging the pressed contact of a variable diameter flywheel agaist a V-belt when a clutch is disengaged so that the transmission of rotation from the driven shaft to the drive shaft may not be allowed. CONSTITUTION:An output shaft 1 and a drive shaft 3 which are concentrically arranged are connected by a centrifugal clutch 8. A variable diameter flywheel 5 on the drive side gives a smaller belt-wrapping diameter as a weight roller 7 is positioned near to the center to expand the gap between two side plates 5A, 5B, while a variable diameter flywheel 12 on the driven side gives a larger belt- wrapping diameter as a movable side plate 12B is drawn near to a stationary side plate 12A by the force of a spring 14 to narrow the gap between the two side plates. When the centrifugal clutch 8 is disengaged to disconnect the transmission of power of the drive shaft 3, the gap in the drive side variable diameter flywheel 5 is caused to open wider enough not to press the sides of a V- belt 13 by setting the amount of displacement of the movable side plate 5B larger than prior types.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a centrifugal belt automatic continuously variable transmission device suitable for two-wheeled motorized vehicles such as so-called family bikes and scooters equipped with a small υ1 air engine.

Some centrifugal Herto automatic continuously variable transmissions transmit or disconnect power from the engine, that is, they also function as a clutch. However, since the belt slips and receives the load when the vehicle starts, it generates a lot of heat, which shortens the belt's lifespan. Therefore, it is currently commonly used to provide an automatic clutch such as a centrifugal clutch on the driven shaft of the transmission so that the load at the time of starting is received by the flange.

The centrifugal belt automatic continuously variable transmission device with the L automatic clutch installed on the driven shaft is suitable for vehicles equipped with small displacement engines because it causes less damage to the belt and the so-called transfer load when pulling the vehicle is light. ing.

However, recently attempts have been made to increase the engine output and the transmission ratio, but this requires an increase in the weight of the flange, the force I+, and the rotational speed. As a result, there are many factors that prevent the transmission from becoming more compact, such as the enlargement of the flange and the reinforcement of the e-axis.

In view of the above points, an object of the present invention is to provide a compact centrifugal belt automatic continuously variable transmission device that does not affect the life of the belt and has a light transfer load. In a centrifugal belt automatic transmission in which a V-belt 1 is wrapped around the motor, the output shaft of the prime mover and the drive shaft are connected by an automatic clutch connected by -1-νt of the rotation speed of the output shaft, and when the clutch is disengaged. , (2) The pressure contact of the variable diameter pulley against the belt is released, making it impossible to transmit rotation from the driven shaft side to the driven I-shaft side.

To explain the specific structure of the embodiment shown in the drawings, ■
is the crank of the engine←11, that is, the output shaft, 2 is the stove)-13 is a foil-shaped drive shaft that is fitted and supported at the end of the output shaft 1 via a bearing 4, and is fixed integrally with the drive shaft 3. It is provided with a variable diameter pulley 5 consisting of a side plate 5A and an axially moving side plate 5B. Axial direction ij) Moving side plate 5B
A weight roller 7 is disposed between the outer surface of the drive shaft 3 and a slope plate 6 fixed to the drive shaft 3 on the outside thereof.

- The output shaft 1 and the drive shaft 3 are concentrically arranged, and the output shaft 1 has a drive disk 8A with a constant r, 4i1, a weight 8B supported by the disk 8A, and a drive shaft 1. It is connected by a centrifugal clutch 8 consisting of a tram-shaped launch outer 8C fixed to the shaft 3 or fixed side plate 5A.

Reference numeral 9 is a center shaft, 10 is a driven shaft relative to the drive shaft 3, and both shafts 9 and 1O are interlocked by a reduction gear group 11. A variable diameter pulley 12 consisting of a fixed side plate 12A and an axially moving side plate 12B is provided integrally with the driven shaft 1O.

A V-bell 13 is wound around the variable diameter pulley 12 on the driven side and the variable diameter pulley 5 on the drive side.

” D. The variable diameter pulley 12 on the driven side is driven by the force of the spring 14.
f Move the moving side plate 12B closer to the fixed side plate 12A to narrow the distance between the two side plates 12A and 12B, i.e. ■Bell) 1
There is a trend toward increasing the diameter of the windings for 3. On the other hand, the variable diameter pulley 5 on the driving side has a weight roller 7.
is closer to the center, that is, to the lower side of the slope plate 6, (2) the tension of the belt 13 widens the distance between the side plates 5A, 5B, and (2) the diameter of the winding around the belt 13 is reduced.

In particular, when the centrifugal clutch 8 is disengaged and power transmission to the drive shaft 3 is cut off, the distance between the side plates 5A and 5B of the variable diameter pulley 5 on the drive side is adjusted to such an extent that the sides of the V-belt 13 are not pressed against each other. The moving range of the movable side plate 5B is set to be larger than that of the conventional one so that the movable side plate 5B can be opened.

Therefore, when the belt 13 is at rest, it is in a slack state near the center of the pulley 5, and when the belt 13 is pulled outward on the drive shaft side as shown in the figure, the variable diameter pulley 5 on the drive side
A gap G is created between the inner surface of the belt 13 and the side surface of the belt 13.

■If the center 1113C of the belt 13 is slightly shifted toward the movable side plate 5B from the center line 5C of the V-shaped groove when the belt of the pulley 5 is engaged, the rotation will be transmitted from the driven shaft side to the drive shaft side. When the movable side plate 5B is easily pushed outward by the V-belt 13, the V-belt 13 and the fixed side plate 5A
A gap G is automatically generated between the two.

Next, the operation of the transmission of the present invention will be explained. Idling: Since the engine rotation speed, that is, the rotation speed of the output shaft 1 is low, the centrifugal clutch 8 remains disengaged. Therefore, V bell) 13 does not turn.

Start... As the engine speed increases, the clutch weight 8B swings outward due to centrifugal force.
The clutch 8 is connected by pressure contact with the tarlatch outer 8C,
Pulley 5 begins to rotate. At the same time, the movement of the assembly weight roller 7 due to the external force pushes the 111 moving side plate 5B toward the stationary side plate 5A, and the effective diameter of the driving side of the belt 13 is set to the diameter of the regular low speed ratio. Side ii) Variable diameter pulley 1
2, power is transmitted to the driven shaft 10 and the vehicle starts moving.

Medium speed......As the engine speed decreases by -L, the effective belt diameter of the driving side 1-diameter pulley 5 increases due to the movement of the weight roller 7, and conversely, the driven side 11-diameter pulley 5 increases due to the movement of the weight roller 7. The effective belt diameter of the deflection diameter pulley 12 becomes smaller because it is pulled by the belt 13 and expands the distance between the side plates 12A and 12B, and the reduction ratio decreases to a medium speed state.

High speed ・・・・・・Furthermore, the engine speed is
As the speed increases, the belt diameter of the variable diameter pulley 5 on the driving side becomes larger, and the belt diameter of the variable diameter pulley 12 on the driven side becomes smaller, resulting in higher speed.

1. In the configuration of the embodiment described above, when the automatic clutch 8 is disengaged, the diameter of the V-belt 13 is adjusted! 1 (5) is pressed or released, when the clutch 8 is connected, it rotates at high speed because it is directly connected to the output Il:l+1, and the belt pressure of the 111-pin variable diameter pulley 5 is instantaneously applied to the belt. There will be no slippage.Also, the bell will not occur until clutch 8 is engaged)
Coupled with the fact that the belt 13 does not rotate, the life of the belt 13 is not adversely affected.

1. During high load situations such as starting in the middle of a hill, the automatic crank
Since the punch 8 receives the load, the belt 13 does not slip.

- When the load is light, such as when starting on a li ground, the apparent J- low speed range increases and the engine starts smoothly.

In addition, in Fig. 1, D of the variable diameter pulley 5 (the moving side plate 5B was placed 1δ on the opposite side from the automatic clutch 8, but fJ', and Fig. 2 is 11f)
This is an embodiment in which the movable side plate 5B is placed on the automatic clutch 8 side.

The centrifugal belt 1 dynamic gear transmission of the present invention is provided with variable diameter pulleys 5φ12 on the drive shaft 3 integrated with the output shaft l of the prime mover and the driven shaft 10 interlocked with the wheels.
In a centrifugal belt automatic continuously variable transmission device in which a V-belt 13 is wound between 112 and 112, the output shaft 1 and the drive shaft 3 are connected by an automatic clutch 8 connected at a rotation speed of 4-yl of the output shaft 1. , when clutch 8 is disengaged, ■bell l-
Since the pressure contact of the +RF variable diameter pulley 5 with respect to the drive shaft 13 is released to disable rotation transmission from the driven shaft 10 side to the drive shaft 3 side, the following effects can be obtained.

(1) Since the output shaft 1 and the drive shaft 3 are connected by the automatic clutch 8, that is, the automatic clutch 8 is engaged and engaged by the output shaft 1 rotating 1-b, the diameter of the clutch 8 can be small, making it small and lightweight. Suitable for 11 rivers equipped with a displacement engine.

(2) When automatic clutch 8 is not engaged (engine is stopped or idling), V-belt 1
Since the pressing force of the pulley 5 does not act on the belt 3, the belt 13 is not subjected to stress at all except when transmitting power, improving the durability of the belt 13.

(3) When the vehicle is idling or the engine is stopped, the V-belt 13 is slack, so only the reduction gear group 11tJJ: and the driven side town variable diameter adjustment 11tl2 rotate together with the wheels. 13. The transfer load is light because there is no need to turn large members such as the variable diameter pulley 5 and the automatic clutch 8 on the drive side, which have an inertia mass of 1 mass.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional plan view of the automatic continuously variable transmission of the present invention, and FIG. 2 is a cross-sectional plan view of only the drive side of a modification thereof. ■ is the output shaft, 3 is the drive shaft, 5 is the variable diameter pulley on the drive side, 5
A is a fixed side plate, 5B is an axial nf moving side plate, 8 is an automatic clutch, 9 is a city shaft, 10 is a driven shaft, 12 is a driven side n pulley with a diameter exactly, 12A is a fixed side plate, 12B is an axially movable side plate,
13 is ■Helt.

Claims (1)

[Claims] (1) A variable diameter pulley is installed on the drive shaft, which is integrated with the output shaft of the prime mover, and the driven shaft, which is linked to the wheels.
In a centrifugal belt automatic continuously variable transmission with a V-belt wrapped between them, the output shaft and drive shaft are connected by an automatic clutch connected at the rotational speed y1 of the output shaft, and the clutch is disengaged ll! An IP dual-use centrifugal belt automatic continuously variable transmission device characterized in that the pressure contact of the iiJ variable diameter pulley against the (l, .