JPS59200857A - Stepless speed change device - Google Patents

Abstract

PURPOSE:To improve power transmission efficiency remarkably by a method wherein small diametral friction disks are pinched and pressed between a pair of large diametral friction disks and both of them are rotated by friction to transmit power. CONSTITUTION:The first small diametral friction disk 20 is fitted to the spline 9 of an input shaft 5 and the second small diametral friction disk 24 is attached rotatably to the proper place of a support shaft 10. The first large diametral friction disk 39 is fitted to the spline 15 of an output shaft 11 and the second large diametral friction disk 41 is engaged rotatably with the spline 19 of a pivot shaft 16, thus, the first and second small diametral friction disks 20, 24 are pinched between and held by the first and second large diametral friction disks 39, 41. According to this method, the power rotates the small diametral friction disks 20, 24 and the large diametral friction disks 39, 41 by friction and is transmitted while contacting condition between both disks becomes better and slip between them will never be generated. Accordingly, the power transmission efficiency may be improved remarkably.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuously variable transmission that increases or decelerates the rotational speed applied to a drive shaft to an arbitrary rotational speed within a certain range and transmits the speed to a driven shaft.

B. Prior art When various mechanisms are operated by a prime mover such as an electric morph via a power transmission mechanism, the power normally transmitted from the prime mover is increased or decelerated to an appropriate speed and transmitted to each mechanism. An appropriate transmission is incorporated within the power transmission mechanism. There are various types of transmissions, and each one is used depending on the purpose. For example, there is a continuously variable transmission device that arbitrarily and continuously changes the speed of power. This type of transmission mainly transmits power through friction transmission, so it is important to ensure good contact between each part to prevent slippage, thereby improving power transmission efficiency and improving shift operability. It becomes.

Purpose of the Invention The present invention aims to provide a friction disc type continuously variable transmission device which improves contact between friction discs to prevent slippage, improves power transmission efficiency, and improves shift operation performance. It is something.

Structure of the halo invention This invention has a pair of large-diameter friction holes ffi (39) (41) on one axis centered on the intersection of two orthogonal axes.
is disposed so as to be movable in its axial direction, a pair of small diameter friction disks (20) (24) are disposed on the other axis such that at least one is movable in its axial direction, and the large diameter friction disk ( 39) Small diameter friction disk (20) between (41)
(24) and fix the power transmission shaft (5) to one of the movable small diameter friction discs (20), and one of the large diameter friction discs (39) or the other small diameter friction discs (20).
4), a power transmission shaft (11) is fixed to the movable side small diameter friction disk (20), and at least one movable side small diameter friction disk (20) is connected to a large diameter friction disk (39) (
41) by appropriate means.

2. Embodiment FIGS. 1 to 4 are drawings showing an embodiment of the present invention, in which (1) is a rectangular cylindrical housing, (2)
(3) is a lid that closes the openings at both ends of the housing (1), and (4) is an intermediate wall installed along the width direction at the center of the housing (1), and its upper and lower surfaces and front and rear surfaces are connected to the housing (1). 1) side walls (la) (lb) and the lid (2) (
3) and face each other at appropriate intervals.

(5) is one lid (2) provided on the housing (1).
), and is rotatably supported via bearings (6) and (7) across the lid (2) and the intermediate wall (4), such as an input shaft; Input pulley at the end (8)
is fixedly installed, and a spline (9) is carved on the peripheral surface along the axial direction from the inner end side. Reference numeral (10) denotes a support shaft installed between the other lid (3) and the intermediate wall (4) provided on the housing (1), and is arranged on the same axis as the input shaft (5).

(11) penetrates the side wall (1a) of the housing (1),
A bearing (12) straddles the side wall (1a) and the intermediate wall (4).
(13) is a power transmission shaft, for example, an output shaft, which is rotatably supported through )
It is engraved.

(I6) is the side wall (lb) and intermediate wall (
4) A pivot shaft I~ is rotatably supported through bearings (17) and (18), and a spline (19) is carved on the circumferential surface along the axial direction from the inner end side. The output shaft (If) and the pivot shaft (16) are arranged on the same axis. This output shaft (11) and pivot shaft (16)
) and the axes (11) of the input shaft (5) and the support shaft (lO) are perpendicular to each other and intersect within the intermediate wall (4).

(20) is a first small-diameter friction disk spline-fitted to the spline (9) of the input shaft (5), which connects a pair of symmetrically formed disk bodies (21) <21>, and A belt (23) made of a material with a large friction coefficient, such as leather, is integrally attached to the surface groove (22) (22). (24) is support@! + A second small-diameter friction disk (10) rotatably mounted at an appropriate location via a bearing, having the same outer diameter as the first small-diameter friction disk (20), and having a pair of Disk body (25) (25
> are coupled together, and a heald (26) with a large friction coefficient is attached to the circumferential grooves (25a) (25a). This second small-diameter friction disk (24) is prevented from moving in the axial direction by the sleeve (27) formed on the support shaft (10) and the fitted collar (28), and is held at a constant position. be done.

(29) is a donut-shaped cylinder member disposed facing the inner surface of the side wall (1a) of the housing (1);
It is configured to be slidable using the protrusion (30) formed in 1a) as a guide. This cylinder member (29) is connected to a pressure chamber (
32) Moves inward due to the pressure of the air supplied inside. (33) is the side wall (1a) and the cylinder member (29).
) is a rotation-stopping dowel pin provided between the (34)
is a donut-shaped cylinder member disposed opposite to the inner surface of the side wall (1b) of the housing (1), and similarly to the above, it can freely slide inward using the protrusion (35) formed on the side wall (1b) as a guide. It's Nishide. This cylinder member (34)
is moved inward by the pressure of air supplied into the pressure chamber (37) from the air port (36) provided in the side wall (1b). (38) is the side wall (1b) and the cylinder member (3
4) is a rotation-stopping knock pin provided between the

(39) is a first large-diameter friction disk that is spline-fitted to the spline (15) of the output shaft (11), and is pressed against the cylinder member (29) via the thrust hair ring (40) so that it can rotate freely. I support it. The first large-diameter friction disk (39) has an inner surface (39a) that is flat, and the inner surface (39a) is used as the first and second small-diameter friction disks (20).
(24) in contact with the peripheral surface. (41) is a second large-diameter friction disk spline-fitted to the spline (19) of the pivot shaft (16), and the thrust bearing (42)
It is rotatably supported by being pressed against the cylinder member (34) via the cylinder member (34). This second large diameter friction disk (41) has an inner surface (41a) that is a flat surface, and the inner surface (41a) is a flat surface.
・It is brought into contact with the circumferential surface of the second small diameter friction disk (20) (24), and the first large diameter friction disk (39) is connected to the first large diameter friction disk (39).
Second small-diameter friction disks (20) and (24) are sandwiched therebetween.

(43) connects the first small diameter friction disk (20) to the input shaft (5)
A moving mechanism that moves the first small-diameter friction disk (
Clamping plate (44) that clamps the front and rear surfaces of 20) (44)
A frame body (47) with movable blocks (45) (46) integrally connected to both ends of the frame body (47) and side lid bodies (2) (3) parallel to the input shaft (5) and passing through the intermediate wall (4). bearing (4B)
It consists of a pair of threaded rods (50) and (51) rotatably attached via the frame body (49).
) are screwed into the corresponding threaded rods (50, 51), respectively. Furthermore, the clamping plates (44) (44) of the frame (47) are connected to the input shaft (5).
) and the screw rods (50) and (51) so as not to interfere with each other. Threaded rod (50) protruding from the lid (3)
The driven gears (52) (53) are fixed to the ends of (51), and the driven gears (52) (53) are attached to the lid body (3).
) and passes through the cover (54) attached to the bearing (55).
) (5'6) rotatably supported by the adjustment shaft (5'6).
7) is meshed with the drive gear (58) fixed to the drive gear (58).

(59) is an adjustment handle attached to the field adjustment shaft (57). When this adjustment handle (59) is rotated, the threaded rods (50) (51) are rotated via the driving gear (58) and the driven gears (52) (53). The screwed together frame body (47) moves, and the first small diameter friction disk (20) moves along the input shaft (5). To explain its function in the above configuration, first, the side walls (la) (lb) of the housing (1)
Compressed air is supplied to the pressure chambers (32) (37) from the air ports (31) (36) opened in 40) (42), the first and second large diameter friction disks (39) and (41) are moved inward to form the first and second small diameter friction disks (20) disposed between them. ) (24) is clamped with appropriate pressure. In this state, power is transmitted from the prime mover (not shown) to the input converter (8) via the heald and the input shaft (5) is rotated. One small diameter friction disk (20) is rotated together. Then, the first small-diameter friction disk (20) and the first
The second large-diameter friction disks (39) (41) rotate, and at the same time, the second small-diameter friction disk (24) also rotates. Then, the output shaft (11) spline-fitted to the first large-diameter friction disk (39) is rotated, and the output pulley (14) is rotated.

The number of rotations transmitted from the input shaft (5) to the output shaft (11) at the time of power transmission is determined by the number of rotations transmitted from the input shaft (5) to the output shaft (11).
The radius from the center of the small diameter friction disk (20) to the contact point (
R) and the radius (X) from the center to the contact point of the first large-diameter friction disk (39) that rotates integrally with the output shaft (11). Small diameter friction disk (20)
By changing the position of the output shaft (11), the rotational speed of the output shaft (11) can be varied steplessly. This first small diameter friction disk (20) can be easily moved by rotating the adjustment handle (59) and moving the frame (47) of the moving mechanism (43). Further, the second small diameter friction disk (24) and the second large diameter friction disk (41) rotate freely, and the first
small-diameter friction disk (20) and first large-diameter friction disk (39)
maintain good contact with the Furthermore, the gear shifting operation is the first
The small diameter friction disk (20) is placed inside the first and second large diameter friction disks i.
C39) (41) is compressed with a constant pressure, but in order to make the shift operation easier, the air supply from the air ports (31) and (36) is stopped during the shift operation, and the first The pinching pressure of the first and second large-diameter friction disks (39) (41) against the small-diameter friction disk (20) may be temporarily reduced.

FIG. 5 and FIG. 6 are drawings showing another embodiment, in which a second small-diameter friction inner M (24) is rotatably and slidably attached to the support shaft (10) via a bush (60). A frame body (61) is attached to the front and rear of the second small-diameter friction disk (24) so as to sandwich it, and the moving blocks (62) (63) at both ends of the frame body (61) are connected to the moving mechanism (43). The screw rods (50) and (51) are screwed together. In the above embodiment, the frame (47) for moving the first small-diameter friction disk (20) and the frame (61) for moving the second small-diameter friction disk (24) are threaded rods (50) (51). ) so that they move in opposite directions with the rotation of (
47) Threaded rod (50) to be screwed into (61) (5
1) Threaded parts (50a) (51a), (50b
) (51b) are formed symmetrically like a turn-hull.

With the above configuration, the first small diameter friction disk (20) and the second
The performance is stable because it rotates under the same conditions as the small diameter friction disk (24).

7 to 9 are drawings showing still another embodiment, in which an input pulley (8) and an output pulley (14) are arranged on the same axis. That is, between the lid body (3) and the intermediate wall (4), it is made to face the input shaft (5), penetrates the lid body (3), and is freely rotatable via bearings (64) (65). The output shaft (66) is supported, and this output shaft (
An output pulley (4) is fixed to the outer end of 66), and a male screw (67) is carved in the middle part. And this output shaft (
A second small-diameter friction disk (24) is fixedly attached to the disk (6G), and a nanol member (68) is screwed onto the male screw (67) to prevent movement in the axial direction. Side wall (1) of housing (1)
Bearings (69) (70) between a) and the intermediate wall (4)
A rotary shaft (71) is rotatably attached through the rotary shaft (71), and a first large-diameter friction disk (39) is spline-fitted into a spline (72) formed on the rotary shaft (71).

In addition, a boss portion (7) is attached to the lid (2) through which the input shaft (5) passes.
3), and a free gear (7
4) is rotatably mounted.

parallel to the human power axis (5) and between the lid body (2) and the intermediate wall (4).
) A short screw press (50) (51) is rotatably installed between the screw rod (50) and (51) that protrudes outward from the lid body (2).
0> Driving gear (75) (7G
) are fixedly installed, and the driven gears (75) and (76) are meshed with the idler gear (74).

Then, an adjustment shaft (57) is rotatably installed between the cover (77) attached to the lid body (2), and the drive gear (58) integrated with the adjustment shaft (57) is connected to the driven gear (75). It's a combination of.

With the above configuration, the rotation transmitted to the input shaft (5) is transmitted to the first small diameter friction disk (20), the first and second large diameter friction disks (39) (4]), and the second small diameter friction disk. Disc (24
) to the output shaft (66).

Incidentally, the relationship between the input shaft and the output shaft L3 in each of the above embodiments may be reversed.

21 Effects of the Invention This invention squeezes a small diameter friction disk between a pair of large diameter friction disks, rotates them by friction, and transmits power.
Since the contact between the large-diameter friction disk and the small-diameter friction disk is good and no slipping occurs, power transmission efficiency is greatly improved.

In addition, since the large diameter friction disk is supported so that it can move in its axial direction, when moving the small diameter friction disk, by slightly moving the large diameter friction disk outward, the movement of the small diameter friction disk becomes easier and the gear shifting operation becomes easier. Improves sex. Furthermore, by coupling one of the pair of power transmission shafts to a large-diameter friction disk or a stationary small-diameter friction disk, the power transmission direction can be easily adapted to either an orthogonal direction or a linear direction.

[Brief explanation of drawings]

1 is a cross-sectional view of an embodiment of the continuously variable transmission according to the present invention, FIG. 2 is a longitudinal sectional view thereof, FIG. 3 is a left side view of the continuously variable transmission with the lid removed, and FIG. The figure is a right side view of the same, FIG. 5 is a cross-sectional view showing another embodiment of the continuously variable transmission, FIG. 6 is a vertical cross-sectional view thereof, and FIG. 7 is an example in which the power transmission shaft is arranged in a straight line. FIG. 8 is a longitudinal sectional view of the embodiment, and FIG. 9 is a side view of the continuously variable transmission with the cover removed. (1) - Housing, (4) - Intermediate wall, (5) - Power transmission shaft (input shaft), (8) - Human pulley, (11)
, -Power transmission shaft (output shaft), (14 no-output coupler, (
20) - First small diameter friction Hita, (24) - Second small diameter friction disk, (29) (34) - Cylinder member, (3
9) - first large-diameter friction disk, (41) - second large-diameter friction disk, (43) - transfer mechanism. Figure 0 = 777

Claims (1)

[Claims] (1) A pair of large-diameter friction disks supported movably in the axial direction on one axis centered on the intersection of two orthogonal axes, and at least one supported on the other axis so as to be movable in the axial direction. A pair of small-diameter friction disks that are movably supported and pressed between the large-diameter friction disks under a constant pressure, and a spline or sliding key connection to allow the movable small-diameter friction disk to move in the axial direction. a power transmission shaft splined or slidably coupled to one large diameter friction disk to permit axial movement, or coupled to a stationary small diameter friction disk; and said movable small diameter friction disk. A continuously variable transmission characterized by comprising a moving ta mechanism for moving a disk in the axial direction.