JP2002327816A - Continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a friction transmission type continuously variable transmission capable of continuously changing the speed in a wide range of change gear ratio with a simple structure. SOLUTION: A driving shaft 2 and a driven shaft 4 are arranged concentrically rotatably with each other, and a driving side and a driven side tires 6 and 8 having the same diameter and possible to be moved in the axial direction and integrally rotated with each other are fitted to the driving shaft 2 and the driven shaft 4. A pair of rotary plates 12A abutting on the peripheral surfaces of the driving side and the driven side tires 6 and 8 to pinch them from both sides thereof with the pressure are arranged. The pair of rotary plates 12A are held freely to rotate around a direction crossing the centers 2a and 4a of the rotation of the driving shaft and the driven shaft as the center O. A tire space maintaining member 32 is provided to maintain a distance between the driving side tire 6 and the driven side tire 8 constant in the direction of the centers 2a and 4a of the driving shaft and the driven shaft. Change gear ratio control means 342, 343 and 344 for setting a directional position of the centers 2a and 4a of the rotation of the driving shaft and the driven shaft are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the technical field of driving force transmission, and more particularly to a friction transmission type continuously variable transmission.

[0002]

2. Description of the Related Art In a continuously variable transmission of a friction transmission type, a driving-side rotating member attached to a driving-side rotating shaft and a driven-side rotating member attached to a driven-side rotating shaft are used. A driving force transmitting member that rotates while abutting on both of them is disposed between the driving force transmitting member and the driving force transmitting member, and transmits the rotating force from the driving side rotating member to the driving force transmitting member. Has communicated. The continuously variable shift operation is performed by continuously changing the contact position and contact posture (direction of the rotation center of the driving force transmitting member) of the driving force transmitting member with respect to the driving side rotating member and the driven side rotating member. .

An object of the present invention is to provide a friction transmission type continuously variable transmission which has a simple structure and is capable of performing a continuously variable transmission operation in a wide speed ratio range.

[0004]

According to the present invention, in order to achieve the above object, a driving-side rotation shaft and a driven-side rotation shaft are arranged so as to be coaxially rotatable. A drive-side tire that is movable along the rotation shaft and rotates with the drive-side rotation shaft is attached to the rotation shaft,
A driven tire that is movable along the driven side rotating shaft and rotates together with the driven side rotating shaft is attached to the driven side rotating shaft, and an outer diameter of the driven side tire is equivalent to an outer shape of the driving side tire, The drive-side rotation shaft and the driven-side rotation shaft are in contact with the outer peripheral surface of the drive-side tire and the outer peripheral surface of the driven-side tire so as to sandwich the drive-side tire and the driven-side tire from both sides. A pair of rotating plates are arranged, the pair of rotating plates have mutually parallel contact surfaces that contact the outer peripheral surface of the driving tire and the outer peripheral surface of the driven tire, and It is held rotatably about a direction orthogonal to the rotation center of the side rotation shaft and the driven side rotation shaft, and the drive side tire and the rotation center of the driven side rotation axis with respect to the direction of the rotation center of the drive side rotation shaft and the driven side rotation shaft. With driven tire A tire spacing maintaining member for maintaining the separation constant; and a gear ratio control means for setting a position of the tire spacing maintaining member in a direction of a rotation center of the driving side rotation axis and the driven side rotation axis. A continuously variable transmission is provided.

In one aspect of the present invention, the speed ratio control means includes a lever rotatably supported about a direction parallel to a rotation center of the pair of rotary plates,
An engagement pin that engages with the engagement slot of the gap maintaining member is provided at the tip of the lever. According to one aspect of the present invention, the apparatus further includes an urging means for urging the pair of rotary plates in a direction to approach each other, and an adjusting means for adjusting the urging force of the urging means. In one aspect of the present invention, each of the pair of rotating plates, the driving tire and the driven tire is made of a magnetic material, and a magnet is attached to each of the pair of rotating plates.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a first embodiment of a continuously variable transmission according to the present invention.
FIG. 3 is an exploded perspective view of the continuously variable transmission of the present embodiment (however, some members are not shown), and FIG. 4 is an assembly thereof. FIG. 5 is a perspective view showing a state, and FIGS. 5 and 6 are partially exploded perspective views of the continuously variable transmission of the present embodiment.

In these figures, the drive-side rotary shaft 2 and the driven-side rotary shaft 4 are coaxially arranged along the X direction with their ends facing each other. That is, the drive-side rotary shaft 2 is mounted on the casing 10 and the support 11 protruding from the casing 10 with the bearings 21 and 21.
2, the driven-side rotating shaft 4 is rotated about the X-direction rotation center 4a by bearings 41 and 42 with respect to the casing 10 and the support 11 by the bearings 41 and 42. Retained as possible. The rotation center 4a is the same as the rotation center 2a.

A sprocket 23 is attached to the drive-side rotary shaft 2 outside the casing 10. The sprocket 23 is rotated by a rotary drive source such as a motor (not shown) via a torque transmitting means such as a chain. Is entered. On the other hand, a sprocket 43 is attached to the driven-side rotary shaft 4 outside the casing 10, and a torque is output from the sprocket 43 to a driven device (not shown) via a torque transmission unit such as a chain. .

The drive-side rotary shaft 2 has guide grooves 24, 25 extending in the axial direction (X direction) in the outer peripheral surface at a portion between the bearings 21, 22 in the casing 10. The guide groove 24 is located on the opposite side of the guide groove 25 with respect to the drive-side rotation center 2a. On the other hand, the driven side rotating shaft 4 has a bearing 4 inside the casing 10.
Axial direction (X direction) on the outer peripheral surface at the portion between 1 and 42
The guide grooves 44 and 45 extending along are formed. The guide groove 44 is located on the opposite side of the guide groove 45 with respect to the driven-side rotation center 4a.

The drive-side rotary shaft 2 has bearings 21 and
The drive-side tire 6 is mounted so as to be slidable in the X direction between the two and to be rotatable around the drive-side rotation center 2a together with the drive-side rotation shaft 2. The driving tire 6 is
It has guide protrusions 61 and 62 extending in the X direction, which are respectively fitted to the guide grooves 24 and 25 of the drive-side rotary shaft 2. On the other hand, the driven-side rotating shaft 4 is provided with a driven-side tire 8 so as to be slidable in the X direction between the bearings 41 and 42 and rotatable together with the driven-side rotating shaft 4 around the driven-side rotation center 4a. Installed. The driven tire 8 has guide protrusions 81 and 82 extending in the X direction and adapted to the guide grooves 44 and 45 of the driven rotation shaft 4, respectively. The outer diameter of the driven tire 8 is equal to the outer diameter of the driving tire 6.

The outer peripheral surface of the driving tire 6 and the outer peripheral surface of the driven tire 8 are in contact with the side of the driving side rotating shaft 2 and the driven side rotating shaft 4 (adjacent area in the Y direction). , 8 so as to pinch them from both sides.
A and 12B are arranged. That is, the rotating plates 12A, 1
2B is attached to the pin 14 via bearings 13A and 13B so as to be rotatable around the Y direction.
1 support in the Y direction. Bearing 1
3A and 13B are of angular contact as shown in FIG. 2 and receive both radial and axial forces. The bearings 13A and 13B can move relative to the pin 14 in that direction (Y direction).

The head flange of the pin 14 and the bearing 13
A and B are arranged between the disc springs 15 and 15 '(the number of disc springs may be increased or decreased as desired). A ring member 16 is disposed between them.
On the other hand, a male screw 17 is formed at the tip of the pin 14 outside the bearing 13B, and a nut 18 is fitted to the male screw 17. Note that the nut 18 may be a double nut. Nut 18 and bearing 1
A ring member 19 is arranged between the inner race and the 3B inner race.

The surfaces of the rotating plates 12A and 12B facing each other are parallel contact surfaces 12As and 12Bs. The corresponding contact surfaces 12As and 12Bs are parallel to the XZ plane, and are in contact with the outer peripheral surface of the driving tire 6 and the outer peripheral surface of the driven tire 8. These abutments are based on the elastic force of the group of disc springs 15, 15 ', and
A and 12B are configured to sandwich the tires 6 and 8. The magnitude of this pinching force depends on the male screw 17 of the pin 14.
By setting the position of the nut 18 in the Y direction adapted to the above, it can be appropriately set. That is, a group of disc springs 1
Numerals 5 and 15 ′ constitute urging means, and a nut 18 adapted to the male screw 17 constitutes urging force adjusting means.

The distance between the driving tire 6 and the driven tire 8 in the X direction is maintained constant by the tire spacing member 32. The tire interval maintaining member 32 is formed by bearings 63 and 64 attached to the driving tire 6 in both directions in the X direction, and a driving leg 321 and bearings 83 and 84 attached to the driven tire 8 in the X direction. And a driven side leg 322 sandwiched from both sides. The driving tire 6
Through the bearings 63 and 64, the tire interval maintaining member 3
The second drive side leg 321 can be rotated relative to the X direction. Similarly, the driven tire 8 can rotate relative to the driven leg 322 of the tire interval maintaining member 32 about the X direction via the bearings 83 and 84.

The position of the tire interval maintaining member 32 in the X direction is set by the gear ratio control means 34. That is, the gear ratio control means 34 includes a first lever member 341 located outside the casing 10, a second lever member 342 located inside the casing 10, and a Y-direction rotating shaft 343 connecting these lever members 341 and 342. , And a Y-direction engaging pin 344 fixed to the tip of the second lever member 342. On the other hand, the tire interval maintaining member 32 has an engagement slot 323 in the Z direction at the upper part.
3, the engagement pin 344 of the speed ratio control means 34 is engaged.

Next, the operation of the continuously variable transmission according to the above embodiment will be described.

When the driving-side rotating shaft 2 rotates around the X-direction rotation center 2a by inputting a rotational force from a rotating driving source, the driving-side tire 6 attached to the driving-side rotating shaft 2 is integrated. To rotate. The rotational force of the driving tire 6 is transmitted to the rotating plates 12A and 12B that are in contact with the outer peripheral surface of the driving tire 6. Thereby, the rotating plate 1
2A and 12B rotate in opposite directions about a rotation center O in the Y direction. And these rotary plates 12A, 12B
Is transmitted to the driven tire 8 that is in contact with them, and is transmitted to the driven rotation shaft 4 to which the driven tire 8 is attached. The rotational force of the driven side rotation shaft 4 is output to a driven device.

In the present embodiment, the gear ratio is determined by the rotation plate 12.
The distance (R1) from the rotation center O of A, 12B to the contact position of the driving tire 6, and the distance (R2) from the rotation center O of the rotating plates 12A, 12B to the contact position of the driven tire 8.
Is determined by the ratio of Rotation shaft 34 of speed ratio control means 34
By appropriately rotating the first lever member 341 around 3, R1 and R2 can be changed simultaneously. Due to the rotation of the first lever member 341, the second lever member 342 changes from the angle −θ to + θ with respect to the Z direction as shown in FIG. 1, and accordingly, R1 becomes the maximum value R1max. From the state shown in which R2 is the minimum value R2min, R1 is the minimum value R1min and R2 is the maximum value R2min.
It changes to the state of max. When R1 decreases, R2 increases, and when R1 increases, R2 decreases, so that the gear ratio can be changed quickly.

As described above, in this embodiment, the driving-side rotating shaft 2 and the driven-side rotating shaft 4 are coaxially rotated, and the driving-side tire 6 and the driven-side tire 8 having the same diameter are used. By adopting a structure in which the pair of rotating plates 12A and 12B presses each other, the gear ratio control is performed by a simple mechanism in which the tire interval maintaining member 32 is linearly moved in the directions of the driving side rotating shaft 2 and the driven side rotating shaft 4. And a wide gear ratio range can be realized.

FIG. 7 is a schematic sectional view showing a continuously variable transmission according to a second embodiment of the present invention, and FIG. 8 is an exploded perspective view of the continuously variable transmission according to the present embodiment (however, some members are not shown). Are not shown). In these figures, FIGS.
Members having the same functions as those described in the above are denoted by the same reference numerals.

In this embodiment, the contact surfaces 12A of the rotating plates 12A and 12B with the driving tire 6 and the driven tire 8 are provided.
Ring-shaped permanent magnets 51A and 51B are mounted on the side opposite to s and 12Bs. The rotating plates 12A and 12B, the driving tire 6 and the driven tire 8
Is made of a magnetic material. Therefore, the permanent magnet 51A, the rotating plate 12A, the driving-side and driven-side tires 6 and 8, the rotating plate 12
A magnetic path is formed via B and the permanent magnet 51B.
The polarities of the permanent magnets 51A and 51B are such that magnetic attraction is generated between the rotating plate 12A and the driving and driven tires 6 and 8, and between the tires 6 and 8 and the rotating plate 12B. Is set. Except for such a configuration, the present embodiment is the same as the first embodiment.

In the present embodiment, in addition to obtaining the same effects as those of the first embodiment, the clamping force of the rotating plates 12A, 12B on the tires 6, 8 is further increased by the magnetic attraction force. Greater torque can be transmitted.

[0024]

As described above, according to the present invention,
Provided is a friction transmission type continuously variable transmission that has a simple structure and is capable of performing a continuously variable transmission operation in a wide speed ratio range.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a continuously variable transmission according to the present invention.

FIG. 2 is a schematic sectional view showing a continuously variable transmission according to the present invention.

FIG. 3 is an exploded perspective view of the continuously variable transmission according to the present invention.

FIG. 4 is a perspective view showing an assembled state of the continuously variable transmission of the present invention.

FIG. 5 is a partially exploded perspective view of the continuously variable transmission of the present invention.

FIG. 6 is a partially exploded perspective view of the continuously variable transmission according to the present invention.

FIG. 7 is a schematic sectional view showing a continuously variable transmission according to the present invention.

FIG. 8 is an exploded perspective view of the continuously variable transmission of the present invention.

[Explanation of symbols]

 2 Drive-side rotating shaft 2a Drive-side rotating shaft rotation center 21,22 Bearing 23 Sprocket 24,25 Guide groove 4 Driven-side rotation shaft 4a Driven-side rotation shaft rotation center 41,42 Bearing 43 Sprocket 44,45 Guide groove 6 Drive-side tire 61, 62 Guide convex portion 63, 64 Bearing 8 Driven tire 81, 82 Guide convex portion 83, 84 Bearing 10 Casing 11 Support 12A, 12B Rotating plate 12As, 12Bs Contact surface 13A, 13B Bearing 15, 15 'Disc spring 16 Ring member 17 Male screw 18 Nut 19 Ring member 32 Tire spacing maintaining member 321 Drive side leg 322 Driven side leg 323 Engagement slot 34 Gear ratio control means 341 First lever member 342 Second lever member 343 Rotating shaft 344 Engagement Pins 51A, 51B Permanent magnet O rotating plate center of rotation

Claims (4)

[Claims] A drive-side rotating shaft and a driven-side rotating shaft are arranged so as to be coaxially rotatable, and the driving-side rotating shaft is movable along the driving-side rotating shaft and rotates together with the driving-side rotating shaft. A driven tire is attached to the driven-side rotating shaft, and a driven tire that is movable along the driven-side rotating shaft and rotates with the driven-side rotating shaft is attached to the driven tire. The outer circumference of the driving tire and the driven tire are in contact with the outer peripheral surface of the driving tire and the outer peripheral surface of the driven tire on the sides of the driving rotary shaft and the driven rotary shaft. A pair of rotating plates are arranged so as to clamp the tire from both sides.
The pair of rotating plates have mutually parallel contact surfaces that abut against the outer peripheral surface of the driving tire and the outer peripheral surface of the driven tire, and the rotation center of the driving rotary shaft and the driven rotary shaft. Tire intervals that are held rotatably about orthogonal directions, and that maintain a constant distance between the driving tire and the driven tire with respect to the direction of the rotation center of the driving rotation axis and the driven rotation axis. It has a maintenance member,
A continuously variable transmission including a speed ratio control unit that sets a position of the tire interval maintaining member in a direction of a rotation center of the driving-side rotation shaft and the driven-side rotation shaft. 2. The gear ratio control means includes a lever rotatably supported about a direction parallel to a rotation center of the pair of rotating plates, and a tip of the lever includes the interval. The continuously variable transmission according to claim 1, further comprising an engagement pin that engages with an engagement slot of the maintenance member. 3. An urging means for urging the pair of rotating plates in a direction to approach each other, and an adjusting means for adjusting an urging force of the urging means. The continuously variable transmission according to claim 1. 4. The pair of rotating plates, the driving tire and the driven tire are all made of a magnetic material.
The continuously variable transmission according to any one of claims 1 to 3, wherein a magnet is attached to each of the pair of rotating plates.