JP2979894B2 - Friction wheel type continuously variable transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction wheel type continuously variable transmission.

[0002]

2. Description of the Related Art A conventional friction wheel type continuously variable transmission is disclosed in Japanese Utility Model Laid-Open No. 63-92856. The friction wheel type continuously variable transmission shown therein includes an input disk, an output disk, a friction roller disposed in frictional contact with both disks in a toroidal groove formed by both disks, and a friction roller. And a roller supporting member that rotatably supports the rotator through an eccentric shaft. The roller supporting members are rotatably supported by spherical bearings at upper and lower rotating shaft portions orthogonal to the rotating shafts of both disks, respectively, and are movably supported in the axial direction of the rotating shaft portions. Each spherical bearing is supported by a link. The dimension between the pair of spherical bearings is the same in the vertical direction. A piston fixed to and integral with the rotating shaft of the roller support member is fitted to the cylinder to form a hydraulic cylinder device. The piston is movable in the axial direction of the piston by the oil pressure in the cylinder of the hydraulic cylinder device, whereby the roller support member is movable in the axial direction of the rotary shaft.
Further, the piston can be integrally rotated by the rotation of the roller support member.

[0003]

However, in the conventional friction wheel type continuously variable transmission, when a force is applied to the friction roller to push the friction roller out of the input / output disk, the roller support member is provided with the center of the spherical bearing as a fulcrum. Is deformed (curved).
Accordingly, the piston fixed integrally with the rotation shaft portion is inclined with respect to the axis of the cylinder. Since the amount of deformation of the lowermost end of the piston, which is far from the point of application of the force applied to the roller support member, is considerably large, the piston prying the cylinder body adversely affects the movement of the roller support member. An object of the present invention is to solve such a problem.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above problem by making the distance between one spherical bearing of a pair of roller supporting members larger than the distance between the other spherical bearings. That is, the friction wheel type continuously variable transmission according to the present invention is disposed in the toroidal groove formed by the input disk (18), the output disk (20), and both disks so as to make frictional contact with both disks. A pair of friction rollers (22) and a pair of friction rollers (22)
0), and is rotatable and rotatable by spherical bearings (110, 112) at upper and lower rotating shafts (83a, 83b) perpendicular to the axes of both disks, respectively. A) a pair of roller support members (83) movably supported in the axial direction of
A piston (12) that is provided on one rotation shaft (83b) of the roller support member (83) and that can drive this in the axial direction.
And a roller support member (8).
3) The pair of spherical bearings (112) on the side of the one rotating shaft (83b) are supported and connected to each other,
One link (118) whose center is supported by a link post (120) and a pair of the spherical bearings (11) on the other rotating shaft (83a) side of the roller support member (83).
0) and a link (114) having a central portion supported by a link post (116) and another link (114).
The dimension between the pair of spherical bearings (112) on the one rotating shaft (83b) side supported and connected to each other by the one link (118) is equal to the size of the other link (11).
4) The rotating shaft portion which is set to be larger than the dimension between the pair of spherical bearings (110) on the other rotating shaft portion (83a) side which are supported and connected to each other and which is inclined when there is no load.
(83b) applied a load to the friction roller (22)
Sometimes configured to tilt in the opposite direction to the initial tilt
Has been characterized. The numbers in parentheses are the reference numerals of the corresponding members in the embodiments described later.

[0005]

The spacing between the spherical bearings on one rotating shaft of the pair of roller support members is set to be larger than the spacing between the spherical bearings on the other rotating shaft. As a result, the interval between the roller support members is narrower on the other rotating shaft side, and the interval increases toward the one rotating shaft side, so the shaft portion of the piston connected to the one rotating shaft portion is also the same. Incline. When a thrust force is applied to the friction roller during operation, the pair of roller support members are deformed in a direction away from each other, and the shaft of the piston is inclined in a direction opposite to the initial inclination. For this reason,
The shaft of the piston does not contact the cylinder body.

[0006]

1 shows a friction wheel type continuously variable transmission. Input shaft 1
4 is a ball bearing 65 and a needle bearing 66
And is rotatably supported by the casing 67 via the.
An output disk 20 is rotatably supported on the input shaft 14 via a bearing 73. The output disk 20 is provided with the output gear 26 via a key 74 disposed at two symmetrical positions so as to rotate integrally. The gear 26 is connected to a casing 67 via a ball bearing 75.
It is supported by. An input disk 18 is provided on the input shaft 14 via a bearing 76 so as to be rotatable and movable in the axial direction. The back side of the input disk 18,
That is, the cam flange 77 is provided on the side opposite to the side facing the output disk 20. The cam flange 77 is spline-coupled to the input shaft 14 and
Is prevented from moving to the left in the figure. A cam roller 79 is provided between the cam surfaces 18a and 77a of the input disk 18 and the cam flange 77 that face each other. Cam surfaces 18a and 77a and cam roller 7
Reference numeral 9 denotes a shape that generates a force for pressing the input disk 18 rightward in the figure when the cam flange 77 and the input disk 18 rotate relative to each other. Input disk 1
The friction roller 22 disposed in a toroidal groove formed by the surfaces of the output disk 8 and the output disk 20 facing each other is rotatably supported by an eccentric shaft 80 via a bearing 81. The friction roller 22 is supported in the thrust direction by a ball bearing 82. The eccentric shaft 80 and the ball bearing 82 are supported by a roller support member 83.

FIG. 2 is a simplified sectional view taken along line 2-2 of FIG. The roller support member 83 rotatably supports the friction roller 22 and is rotatably and vertically movable by spherical bearings 110 and 112 on upper and lower rotating shaft portions 83a and 83b. The pair of spherical bearings 110 are connected by a link 114, and the link 114 is supported by a link post 116 fixed to the casing 67. A pair of spherical bearings 112 are also supported by the link 118,
Link 118 is supported by link post 120. At the lower end of the rotating shaft 83b, a piston 124 is provided integrally therewith. The piston 124 has a piston insertion hole 1 formed by a cylinder body 126.
30 are fitted. The piston 124 and the piston insertion hole 130 of the cylinder body 126 constitute a hydraulic cylinder device for moving the rotary shaft 83b in the axial direction. Between the shaft portion 124a projecting below the piston 124 and the cylinder body 126, there is provided a clearance for lubricating oil sealing by a seal ring (not shown). The length L2 of the link 118 supporting between the lower left and right rotation shafts 83b is the same as the length of the link 114 supporting between the upper right rotation shaft 83a.
Is set to be larger than the length dimension L1. As a result, the shaft portion 124a of the piston 124 is in an inclined state as shown in the initial state. That is, in FIG. 2, the shaft portion 124a and the cylinder body 12
The dimension n1 to the outside of the hole of No. 6 is smaller than the dimension n2 to the inside of the hole of the shaft portion 124a and the cylinder body 126.

The operation of the embodiment will be described. When a thrust force is applied to the friction roller 22 during operation, a force is also applied to a roller support member 83 that supports the friction roller. As a result, the roller support member is provided with the spherical bearing 1 in the rotating shaft portion 83a.
With the fulcrum 10 as a fulcrum, and with the spherical bearing 112 as a fulcrum in the rotating shaft portion 83b, it is deformed so as to expand outward in FIG. Thereby, the shaft portion 124a on the left side in FIG.
It deforms so as to rotate counterclockwise about the spherical bearing 112. That is, the shaft portion 124a is deformed in a direction in which the dimensions n1 and n2 are equal. Therefore, the shaft portion 124a does not contact the hole of the cylinder body 126.

[0009]

As described above, according to the present invention, a pair of roller supporting members are arranged such that the interval between one of the rotating shaft portions is larger than the interval between the other rotating shaft portions. Due to the support, the shaft of the piston can be inclined in a predetermined direction in advance. As a result, a thrust force is applied to the friction roller, and the roller support member is deformed, so that even when the shaft of the piston is inclined in a direction opposite to the above-described predetermined direction, the shaft of the piston kneads the surface of the hole of the cylinder body. This does not adversely affect the movement of the roller support member.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a simplified sectional view taken along line 2-2 of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 18 Input disk 20 Output disk 22 Friction roller 80 Eccentric shaft 83 Roller support member 83a, 83b Rotation shaft part 110, 112 Spherical bearing 114, 118 Link 116, 120 Link post 124 Piston

Claims (1)

(57) [Claims] An input disk (18), an output disk (20), and two toroidal grooves formed by the two disks.
Placed in frictional contact with the discpairFriction ro
(22),pair Of the friction roller (22) through the eccentric shaft (80).
Supports rotation and is perpendicular to the axis of both disks
In the upper and lower rotation shaft portions (83a, 83b),
Rotational shaft and rotatable by surface bearings (110, 112)
Parts (83a, 83b) are supported so as to be movable in the axial direction.
IspairRoller support member (83), and one rotation shaft (83b) of the roller support member (83).
And a piston (12) capable of driving this in the axial direction.
4) a hydraulic cylinder device provided with the above-mentioned one rotation shaft portion (83) of the roller support member (83);
b) sidepairSupport the above spherical bearings (112).
Attach and link, and link post at center (120)
Link (118) supported by the roller and the other rotating shaft (83a) side of the roller support member (83)
Of the above-mentioned spherical bearings (110) are supported and connected to each other.
And a link post (116) at the center.
And the other link (114) supported and supported by the friction wheel type continuously variable transmission, comprising:
A pair of the spherical surfaces on the one rotating shaft portion (83b) side
The dimension between the bearings (112) is the same as that of the other link (11).
The other rotating shaft portion supported and connected to each other by 4)
From the distance between the pair of spherical bearings (110) on the (83a) side
Also set biggerRotating shaft that was tilted when no load was applied
(83b) applied a load to the friction roller (22)
Sometimes configured to tilt in the opposite direction to the initial tilt
Have been  A friction wheel type continuously variable transmission characterized by the above-mentioned.