JPS5884233A - Centrifugal clutch - Google Patents

Abstract

PURPOSE:To heighten slip torque and surely transmit torque, by using the outward displacement of balls under centrifugal force to displace a movable plate in the axial direction to bring conical friction contact surfaces into contact with each other. CONSTITUTION:A plurality of arc-shaped recesses 16 are provided at regular intervals in the circumferential direction on the peripheral part of a movable plate 2 facing a protective disc 7. The side surface of each recess 16 is made oblique at 6 so that the width of the recess increases inwards in the radial direction. A plurality of balls 5 are provided in each recess 16 so that the balls are juxtaposed in the circumferential direction. When the rotational frequency of the movable plate 2 turned by a driving shaft 1 is increased, the balls 5 are moved outwards by the centrifugal force to displace the movable plate in the axial direction to bring the conical friction contact surfaces 4 of the movable plate and a driven member 3 into contact with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a centrifugal system that transmits rotation of the driving shaft to a driven body when the rotational speed of the driving shaft exceeds a predetermined value.

This centrifugal clutch is generally constructed so that rotational force is transmitted by bringing the 5-initiator into contact with the inner circumferential surface of the cylindrical driven body using centrifugal force against the spring bias. The contact pressure at the frictional contact surface between the initiator and the driven body depends directly on the centrifugal force, so if the slip torque is small and the load on the driven body becomes a little large, there will be slippage between the initiator and the driven body. The present invention was made in consideration of these points, and its purpose is to provide a system in which the frictional contact surface is a conical surface, the slip torque is large, and the rotation is transmitted reliably. Seven and - who can do
There is a centrifugal clutch that does not reduce slip torque due to wear of frictional contact surfaces.

The present invention will be explained in detail below based on illustrated embodiments. (1) in the diagram
is a driving shaft to which a sleeve is fixed, and a movable plate (see Fig. 2) is attached to the outer periphery of the sleeve (00).
As shown in the figure, it is mounted so that it can freely slide in the axial direction and transmit rotation by means of odd-shaped fitting, five-line coupling, etc. Driven body (3)
is a pair of bearings (11) (11) K, so the driving shaft (1
), which is rotatably supported coaxially and separately from the movable plate (), and is composed of a driven wheel (Q) whose outer circumferential surface is a pulley and a lid (H). At one end of this storage space in the axial direction, a protective disc (7) having a diameter of approximately 100 mm and rotating together with the movable plate (2) is stored. , and a spring (9) disposed between one of the bearings (1) and the movable plate (2).
), the movable plate (2) is biased in the axial direction where it contacts the protective disc (7). The driven body (3) is a cooling fan.

The frictional contact surface (4) that transmits the rotation of the driving shaft +11 to the driven body (3) K is the conical outer surface H provided on the movable plate (ri) and the conical inner surface H on the driven wheel (I), and both Contact is made by the axial movement of the movable plate (2) against the tension of the spring.

The next force after the axial movement of the movable plate (2) is
2) and is obtained by movement of a round ball (5) due to centrifugal force. That is, the protective disk (7) of the movable plate (6)
) The outer periphery of the side surface "K%2" As shown in the figure, a plurality of arc-shaped recesses a are provided at equal intervals in the circumferential direction.
The back wall of ll is made into an inclined surface (6) that becomes deeper as the inner diameter increases, and a plurality of balls (5) are arranged circumferentially in each recess attt, and a movable plate is formed by input from the driving shaft +11. The rotation speed of (2) increases and the slope (6) and the protective disc (7) increase.
) The centrifugal force acting on the ball (6) K located at the junction with the inclined surface (6)
), the ball (6) moves outward and pivots the movable plate (2) by the inclined surface (6). The movable plate (2) and the driven body (3) have a frictional contact surface (7) which is a conical surface.
4) are brought into contact with each other. The higher the rotational speed of the driving shaft (1), the greater the centrifugal force acting on the ball (6) K, and the greater the amount of outward movement, increasing the contact pressure on the friction contact surface (4). Even if the load applied to the driven body [3) K becomes large, the frictional contact surface (4) is a conical surface, and the retreat of the movable plate (2) is due to the component force of pushing the green (5) in the 8+ direction (6) K. Slip does not easily occur in a method that requires an extremely large amount of force to be moved inward, and the sliding torque is extremely large.・Frictional contact surface (
If the adjustment in 4) progresses, even greater torque transmission will be possible. In the figure, the bearing locking snapper/Siprisig is shown.
(6) is the threaded part between the drive shaft and the sleeve shaft inside the shaft.

FIG. 3 shows another embodiment. Koreke* (61 uses the opposite surface of the inclined surface (6) for pressing the inclined surface (6) of the movable plate (2) as the cover of the driven body (3) and the protective disc (
There are 9 items except 7). Although the load of ff +51 K increases, the number of parts can be reduced.

The embodiment shown in FIG. 4 has an inclined surface (
6) is provided with a driven body (3)K, and a movable plate (2)
) are provided with a plurality of recesses at equal intervals on the outer circumferential surface of the driven body (3) to house a plurality of balls (6) in the circumferential direction, and an inclined surface (6) is provided on the inner circumferential surface of the driven body (3). There is. Unless the movable plate (2) is moved in the axial direction against the spring (9) K by taking advantage of the restrictions imposed by the inclined surface (6) K, the axle (6) cannot move outward due to centrifugal force. The frictional contact surface (4) can be brought into contact with the friction contact surface (4).

Still other embodiments are shown in FIGS. 5 and 6. This adds the force that follows the axial movement of the movable plate (2) to the centrifugal force applied to the sphere (51K), fills the space surrounded by the driven body (3), and then moves the fluid (8) to the movable plate ( 2) is obtained by driving the movable plate (2), the circumferential portion of the movable plate (2) is formed by a plurality of blades 081 having pitch angles, and a recess (161K circumference) is provided on the outer circumference of each blade 08). A plurality of balls (5) are arranged in the direction so that the inner peripheral surface of the driven body (3) has a gentle inclination IIi (61).The movable plate (2) is connected to the driving shaft (
1), the vane will move the fluid (8) into the fifth
Move it to the left in the diagram. With this repulsive force, the movable plate (2) gains propulsion and moves in the axial direction on the right side of the figure at night (9) with the force from the ball (6), the inclined surface (6), and K. Then, the frictional contact surface (4) of the conical outer surface 04) and the conical inner surface (4) are brought into contact.

If the rotation speed of the driven body (3) increases to the same speed as the driving shaft (1) due to this contact, the fluid (8) will also be able to move. 8)
Although the ball (6) is not driven by the movable plate (2), the centrifugal force causes the ball (6) to move outward and touch the #4 slope (6), causing the fibrillation plate (
2) is prevented from returning by the spring (9), and the contact state of the frictional contact surface (4) is maintained. In addition, as the rotational speed increases, the position on the inclined surface (6) where the ball (5) contacts becomes a position where the ball (6) moves outward to a greater extent, and the tightness of the frictional contact surface (4) increases. increases, and the slip torque increases.

In addition, in the drawings in each of the above embodiments, the friction contact surface (4)
This figure shows a state in which the driving shaft (1) is in contact with the driven body (3) and the rotation of the driving shaft (1) is transmitted to the driven body (3). When the ball 11 is not rotating or the rotational speed is low, the frictional contact surface (4) is separated as shown in FIG. 1, and the ball (6) is in an inner trap position. The number of rotations (rotational speed) at which the frictional contact surface (4) contacts can be adjusted by the spring (9)K.

As described above, in the present invention, the movable plate is moved in the axial direction by outward movement due to the centrifugal force of the sphere, and the conical friction contact surfaces are brought into contact with each other. In addition, K, which causes the ball to move inward against the centrifugal force, is relatively high due to the axial retraction from the movable plate, and the driven shaft 6 from the driving shaft is
Rotation can be reliably transmitted to the body, and slipping does not occur easily even when the load torque increases, and the conical friction contact surface can perform even greater torque transmission if it is rubbed together. As the rotation speed of the driving shaft increases, k
Over time, the degree of closeness of the friction contact surfaces increases, making uniform transmission more reliable.Furthermore, even if the friction contact surfaces wear out, the limit number of rotations for contact and non-contact of the friction contact surfaces only changes, resulting in slip torque. remains almost unchanged, and the limit rotation speed can be resolved by adjusting the spring load applied to the movable plate.

[Brief explanation of drawings]

Figure 1 is a longitudinal cross-sectional view of one embodiment of the present invention, Figure @2 is a cross-sectional view of the same as above, Figures 9, 3, 4, and gIJ5 are longitudinal cross-sectional views of different embodiments, and Figure 6 is a cross-sectional view of the same embodiment. FIG. 5 is a cross-sectional view of the embodiment, in which +11#-1i driving shaft, (2) a movable plate, (3
) is the driven body, +41Vi friction contact surface, (5) is the ball, (6
1Fi slope, (7) #- indicates Hosan round rice, +81t'j fluid. Figure 3 Figure 4 Figure 5 Figure 6 Figure 6

Claims (1)

[Claims] +11 A driving shaft, a movable plate that rotates together with the driving shaft and is slidable in the axial direction of the driving shaft, and a conical plate that is supported coaxially with the beating shaft and is connected to the movable plate. A driven body that constitutes a frictional contact surface, a plurality of balls arranged in the circumferential direction of the movable plate, and a shaft that resists the spring load of the movable plate through the balls and the outward movement of the balls due to centrifugal force. (2) The inclined surface is provided on one surface of the movable plate that faces the protective disc that rotates with the driving shaft, and the ball moves along the inclined surface. (3) The driven body surrounds the movable plate! ! The centrifugal craft according to claim 1, characterized in that the movable plate is provided with a vane that drives the fluid filled in the closed space to obtain an axial propulsion force.