JPH06174031A - Half toroidal type continuously variable transmission - Google Patents

Abstract

PURPOSE:To increase the rigidity of a post member to transmit a force operating to power rollers to a housing through a link, and to regulate an accurate change gear ratio, by making the post member into a single member striding from the upper link to the lower link, and fixing it to the housing at its both ends. CONSTITUTION:Power rollers 5a and 5b are provided between an input disk 2 and an output disk 3, and shafts 8a and 8b are held to trunnion shafts 9a and 9b. When the trunnion shafts 9a and 9b are rotated, the shafts 8a and 8b are rotated, and the power rollers 5a and 5b are fluctuated between the input disk 2 and the output disk 3, so as to change the change gear ratio. To both the upper ends of the trunnion shafts 9a and 9b, an upper link 12 is suspended, and to both lower ends of them, a lower link 16 is suspended. Through holes 40 and 42 are formed to the centers of the upper link 12 and the lower link 16, and the through holes 40 and 42 are penetrated by a single post member 22. The upper end of the post member 22 is fixed by the through hole 47 of a housing 10, and its lower end is fixed by the recess 49 of the housing 10.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art A half toroidal type continuously variable transmission is known as one type of continuously variable transmission, and an example thereof is disclosed in Japanese Patent Laid-Open No. 62-258254. This is shown in the attached FIGS. 4 and 5. In this type of continuously variable transmission, as schematically shown in FIG.
Are rotated by the input shaft 101. The output disk 103 is arranged to face the input disk 102, and when the output disk 103 rotates, the output shaft 104 rotates. A pair of power rollers 105a and 105b are sandwiched between the input disk 102 and the output disk 103, and the rotation axis lines 107a and 107 of both power rollers 105a and 105b are sandwiched.
b is swingable around the swing shafts 106a and 106b as shown by an arrow α. The structure of FIG. 5 is incorporated in the housing. In this type of transmission, the gear ratio is adjusted steplessly by adjusting the swing angles of the power rollers 105a and 105b.

In the case of a half toroidal type continuously variable transmission of this type, if the speed ratio is set to other than 1: 1, the power roller 10 is used.
A force in the direction indicated by the arrow X in FIG. 5 acts on the swing shafts 106a and 106b of the shafts 5a and 105b.

FIG. 4 is a schematic half sectional view taken along line IV-IV in FIG. 5, showing one power roller 105a side. Actually, it appears symmetrically. Further, FIG. 4 shows a state in which the power rollers 105a and 105b (not shown) are in the neutral position and the gear ratio is 1: 1.
The power roller 105a has a rotation axis 1 by a shaft 108a.
Rotate around 07a. The shaft 108a is the trunnion shaft 1
The trunnion shaft 109a is fixed to the housing 109 and is rotatable with respect to the housing 110 around the swing shaft 106a. The same applies to the side of the power roller 105b.

An upper link 112 is provided between the upper ends of the pair of trunnion shafts 109a and 109b via bearings 111a and 111b (not shown). A lower link 116 is provided between the lower ends of the pair of trunnion shafts 109a and 109b via bearings 115a and 115b (not shown). A pin 114 is inserted through the central opening of the upper link 112, and the pin 114 is a nut 113 and is used for the housing 11
It is fixed at 0. A pin 117 is inserted through the central opening of the lower link 116, and the pin 117 is a nut 118.
It is fixed to the housing 110. With this configuration, when the gear ratio is set to other than 1: 1, the trunnion shaft 1
The force in the X direction of FIG. 5 acting on the motors 09a and 109b is transmitted to the housing 110 via the links 112 and 116 and the pins 114 and 117.

[0006]

In such a conventional structure, the forces acting on the trunnion shafts 109a and 109b are
It is received via links 112 and 116 by pins 114 and 117, which are fixed to the housing 110 in a cantilevered manner, respectively. For this reason, the amount of bending of the pins 114 and 117 increases, and the strength tends to be insufficient. Also pin 11
It was necessary to firmly fix No. 4 and 117 to the housing 110, and it was necessary to use a fastener capable of obtaining high strength. Therefore, the present invention proposes a structure in which the amount of bending of the member for transmitting the force acting on the link to the housing is reduced and the member can be more easily attached to the housing.

[0007]

Therefore, according to the present invention,
An input disk rotated by an input shaft and an output disk for rotating the output shaft are arranged in a housing so as to face each other, and a pair of power rollers are provided on the housing by a pair of rotatable trunnion shafts for the input disk and the output disk. A half toroidal type continuously variable transmission in which the upper link is passed between the upper ends of the pair of trunnion shafts, and the lower link is passed between the lower ends of the pair of trunnion shafts. A member that penetrates through the central portions of the upper link and the lower link and transmits the force acting on the upper link and the lower link to the housing has both ends as one post member fixed to the housing.

[0008]

According to the present invention, the force acting on the upper link and the lower link is received by the single post member fixed to the housing at both ends. That is, the post member that receives the force is fixed to the housing in a double-supported state. Therefore, the amount of bending of the post member is reduced, and the post member is firmly fixed to the housing with a simple structure.

[0009]

According to the present invention, since the force acting on the trunnion shaft of the half toroidal type continuously variable transmission is received by the single post member supported at both ends of the housing, the flexure of the post member is achieved. It is possible to hold down the amount small, and it is also possible to fix the post member to the housing with a simple structure.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 10 indicates a housing, on which the input shaft 1 is rotatably supported by bearings 31 and 32. The input disc 2 is fixed to the input shaft 1, and when the input shaft 1 is rotated, the input disc 2 is also rotated. The output disk 3 and the drive gear 20 are integrally rotatable around the input shaft 1. The output disc 3 is arranged facing the input disc 2. The drive gear 20 meshes with a driven gear 21, and the driven gear 21 is fixed to the output shaft 4. As a result, when the output desk 3 rotates, the output shaft 4 rotates.

As shown in FIG. 2, a pair of power rollers 5 are provided between the input disk 2 and the output disk 3.
a and 5b are arranged. Each power roller 5
The a and 5b are sandwiched between the input disk 2 and the output disk 3 and are capable of transmitting power by frictional force. The respective power rollers 5a and 5b have shafts 8a and 8b.
The shafts 8a and 8b are rotatable around the trunnion shafts 9a and 9b.
It is supported by a and 9b. The trunnion shafts 9a and 9b are rotatable with respect to the housing 10 by bearings 33a and 33b. When the trunnion shafts 9a and 9b rotate, the shafts 8a and 8b rotate and the pair of power rollers 5
The a and 5b swing between the input and output disks 2 and 3 to change the gear ratio.

An upper link 12 is passed over the upper ends of the pair of trunnion shafts 9a, 9b via bearings 11a, 11b. A lower link 16 is passed between the lower ends of the trunnion shafts 9a and 9b via bearings 15a and 15b. Rectangular through holes 40 and 42 are formed in the centers of the upper link 12 and the lower link 16.

A single post member 22 penetrates the through holes 40 and 42. The upper end of the post member 22 is fixed by a through hole 47 provided in the housing 10, and the lower end is fixed by a recess 49 provided in the housing 10. The cross-sectional shapes of the through hole 42 of the lower link 16 and the post member 22 are substantially the same. On the other hand, the width of the through hole 40 of the upper link 12 in the left-right direction in FIG. 2 is slightly larger than the width of the post member 22, and a gap G is secured between the through hole 40 and the post member 22 in the left-right direction of FIG. It On the other hand, the through hole 40 and the post member 22 are in contact with each other in the direction perpendicular to the paper surface of FIG. An oil passage 44 extending along the axis is secured in the lower half of the post member 22, and the oil passage 44 communicates with an oil passage 50 formed in the wall of the housing 10. Lubricating oil is supplied from the upper end of the oil passage 44. In addition, the through hole 4 is provided at the center of the post member 22.
6 is formed, and interference with the input shaft 1 is avoided.

Worm wheels 28a and 28b are fixed to the upper ends of the pair of trunnion shafts 9a and 9b, respectively. Then, as well shown in FIG. 3, the worm wheels 26a, 2b are attached to the worm wheels 28a, 28b.
6b is engaged. The worm gears 26a and 26b are rotated by a shaft 24, and the shaft 24 is rotated by a gear ratio adjusting motor 23. The rotational relationship between the worm gear 26a and the worm wheel 28a and the rotational relationship between the worm gear 26b and the worm wheel 28b are set to be opposite to each other. When the motor 23 rotates, the worm wheel 28
a and 28b rotate in opposite directions. As a result, the pair of trunnion shafts 9a and 9b rotate in opposite directions, and the power roller 5
a and 5b swing in opposite directions.

In the case of the half toroidal type continuously variable transmission having this structure, the gear ratio can be continuously changed by changing the swing angle of the power rollers 5a and 5b by the motor 23. At this time, a force is applied to the power rollers 5a and 5b in the direction perpendicular to the plane of FIG. This force is received by the single post member 22 via the upper link 12 and the lower link 16.

In this embodiment, since both ends of one post member 22 are fixed to the housing 10, the amount of bending of the post member 22 is smaller than that when a force is received by a cantilevered pin. can do. Therefore, the rigidity of the transmission is improved, and the gear ratio can be adjusted accurately. Further, in this embodiment, since the post member 22 is supported by the housing 10 at both ends, the supporting structure at each supporting portion is simple.

[Brief description of drawings]

FIG. 1 is a central sectional view of an embodiment.

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

FIG. 3 is a view from the IV direction in FIG.

FIG. 4 is a schematic half sectional view of a conventional continuously variable transmission.

FIG. 5 is another sectional view of a conventional continuously variable transmission.

[Explanation of symbols]

 1: Input shaft 2: Input disc 3: Output disc 4: Output shaft 5: Power roller 9: Trunnion shaft 10: Housing 12: Upper link 16: Lower link 22: Post member

Claims (1)

[Claims] 1. An input disk rotated by an input shaft and an output disk for rotating an output shaft are arranged opposite to each other in a housing, and a pair of power rollers are input to the housing by a pair of rotatable trunnion shafts. A half toroidal type in which a disc and the output disc are swingably arranged, and an upper link is transferred to the upper ends of the pair of trunnion shafts, and a lower link is transferred to the lower ends of the pair of trunnion shafts. In the continuously variable transmission, a member that penetrates through the central portions of the upper link and the lower link and transmits the force acting on the upper link and the lower link to the housing is a single member whose both ends are fixed to the housing. A half toroidal type continuously variable transmission characterized by being a post member.