JP2002295619A - Frictional wheel type continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve fuel consumption and accelerating performance by eliminating inadequate of rigidity of a casing and a valve body for solving problems, such as gear noise and a service life and preventing instability, when changing speed. SOLUTION: This friction wheel type continuously variable transmission is provided with a first link 44 for connecting a pair of first roller support members 40 and 42 for supporting a pair of first friction rollers 14a to each other at both ends thereof, in order to regulate mutual positional relation between them, a first link post 48 for supporting an intermediate part of the first link with a casing 46, a second link 50 for connecting a pair of second roller support members for supporting a pair of second friction rollers to each other at both ends thereof, in order to regulate the mutual positional relation between them, and a second link post for supporting an intermediate part of the second link with the casing. The first link post and the second link post are integrally formed with each other via a fixing member 52, and rigidity of the fixing member and rigidity of the casing are set nearly equal to each other.

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 friction wheel type continuously variable transmission has two continuously variable transmission mechanisms arranged in parallel. The two input disks and the two output disks constituting the continuously variable transmission mechanism are connected so as to rotate integrally. Therefore, if one of the continuously variable transmission mechanisms is controlled by the transmission servo device, the two sets of continuously variable transmission mechanisms can be simultaneously controlled. In the above-described continuously variable transmission mechanism, the link post that supports the link that connects the pair of roller support members to each other is directly fixed to the casing. Therefore, the link post fixing portion of the casing requires a large rigidity. That is, when the speed ratio is other than 1, a force in the input / output axial direction acts on the link post,
Rigidity of the casing for fixing the link post is required, and it is necessary to cope with the problem by increasing the wall thickness and installing reinforcing ribs. However, when trying to secure the required rigidity with an aluminum alloy casing, the casing becomes extremely large, and it is practically difficult to secure sufficient rigidity.

As a technique for solving such a problem, there is, for example, a friction wheel type continuously variable transmission described in Japanese Patent Publication No. Hei 8-23386. This publication discloses means for reducing the canning between link posts or the force applied to the valve body. That is, the link post of one of the continuously variable transmission mechanisms and the link post of the other continuously variable transmission mechanism are formed by an integral member, or both link posts are connected by a rigid connecting member, and the casing or the valve The above problem is solved by lowering the rigidity of the body.

[0004]

[Problems to be solved by the invention]
JP-A-8-23386 also has problems to be solved as shown below. In other words, Japanese Patent Publication No. Hei 8-23386 discloses that the casing itself is designed to have low rigidity in order to impart rigidity to the link post or the connecting member, so that the pressing force required for power transmission of the continuously variable transmission mechanism is not applied to the casing. Although not provided, the torsional rigidity of the casing affected by the torque transmission is also reduced.

When the torsional rigidity of the casing is reduced, the continuously variable transmission mechanism and the gear mechanism, which are power transmission elements, are positioned and supported by the casing. There are problems such as an increase in noise due to poor precision of the gear, a reduction in gear life, and instability of gear shifting due to a poor precision of a support portion of the continuously variable transmission mechanism.

If the rigidity of the casing is increased in order to eliminate these problems, the entire transmission becomes heavy due to the increase in the weight of the connecting member and the weight of the casing itself as in the conventional case. With a heavy transmission, fuel economy, acceleration performance, and assemblability may deteriorate.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and solves the problem of gear noise and life by eliminating insufficient rigidity of a casing and a valve body. It is an object of the present invention to provide a friction wheel type continuously variable transmission capable of improving fuel efficiency, acceleration performance, and assemblability by reducing the overall weight.

[0008]

In order to achieve the above object, a friction wheel type continuously variable transmission according to claim 1 comprises a first input disk, a first output disk, and a pair of first and second disks which are in frictional contact with both disks. A first continuously variable transmission mechanism comprising one friction roller;
The second input disk, the second output disk, and a second continuously variable transmission mechanism including a pair of second friction rollers that frictionally contact both disks are coaxial, and the first and second continuously variable transmission mechanisms are the first and second continuously variable transmission mechanisms. The second input disks are arranged so that the arrangements in the axial direction are opposite to each other, and the first input disk and the second input disk are connected so as to rotate integrally, and the first output disk and the second output disk are connected to each other. Are connected so as to rotate integrally with each other, a pair of first roller supporting members respectively supporting a pair of first friction rollers are connected at both ends thereof to regulate a mutual positional relationship. A first link, a first link post for supporting an intermediate portion of the first link to the casing, and a pair of second roller supporting members for respectively supporting the pair of second friction rollers. A second link connected at an end for regulating a mutual positional relationship, and a second link post for supporting an intermediate portion of the second link to a casing, wherein the first link post and the second link post are provided. And an integral structure via a fixing member, and the rigidity of the fixing member and the rigidity of the casing are set substantially equal.

According to a second aspect of the present invention, there is provided a frictionless wheel type continuously variable transmission, wherein the first continuously variable transmission mechanism includes a first input disk, a first output disk, and a pair of first friction rollers that frictionally contact the two disks. , A second continuously variable transmission mechanism comprising a second input disk, a second output disk, and a pair of second friction rollers in frictional contact with both disks.
A continuously variable transmission mechanism is arranged such that the arrangement of the first and second input disks in the axial direction is opposite to each other, and the first input disk and the second input disk are connected so as to rotate integrally, and In a friction wheel type continuously variable transmission in which an output disk and a second output disk are connected so as to rotate integrally, a pair of first friction rollers respectively supporting the pair of first friction rollers is provided.
A first link post for supporting the roller support member on the casing or the valve body, a second link post for supporting the pair of second friction rollers on the casing or the valve body, and the first link post. A connection member for connecting the second link post; and a rigidity of the connection member and a rigidity of the casing or the valve body are set substantially equal.

According to a third aspect of the present invention, in the friction wheel type continuously variable transmission according to the second aspect, the connecting member includes a pair of the first roller supporting member and a pair of the second roller supporting member. It is a member that also has a positioning function.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 2 denotes an input shaft to which power from an engine (not shown) is input, and a main shaft 4 is rotatably arranged by abutting the input shaft 2. A first continuously variable transmission mechanism 6 and a second continuously variable transmission mechanism 8 are coaxially arranged on the main shaft 4. The first and second continuously variable transmission mechanisms 6 and 8 include a first input disk 10a and a first output disk 12a, a second input disk 10b and a second output disk 12b, which are arranged to face each other, and these input disks 10a. , 10b and each output disk 12
a and a pair of first friction rollers 14a disposed between
And a pair of second friction rollers 14b.

The opposing surfaces of the input disks 10a, 10b and the output disks 12a, 12b are respectively formed as toroid surfaces, and the first and second friction rollers 1 are provided on the input disks 10a, 10b and the output disks 12a, 12b.
The first and second power rollers 14a and 14b can be tilted in a state where the power rollers 4a and 14b are in contact with each other.

A loading cam device 24 is disposed between the first input disk 10a of the first continuously variable transmission mechanism 6 and the main shaft 4. This loading cam device 2
Reference numeral 4 denotes a cam flange 22 which is connected to the input shaft 2 and rotates integrally, and the cam flange 22 and the first input disc 1
A plurality of rollers 25 rotatably held by a holder 23 between the first input disk 10a and the first input disk 10a via a loading cam device 24.

On the other hand, the first and second output disks 10a, 1
0b is connected to the output gear 18, so that the first and second
The torque transmitted to the output disks 10a and 10b is collected by the output gear 18 and transmitted to the output shaft 28 via the drive gear 26 meshing with the output gear 18.

When torque is transmitted to the input shaft 2 with the operation of the engine, the torque is transmitted to the cam flange 2.
2. While being transmitted to the first input disk 10a via the loading cam device 24 and to the second input disk 10b via the main shaft 4, the first and second input disks 10a and 10b rotate.

The torque input to the first and second input disks 10a and 10b is applied to the first and second power rollers 14a and 14a.
4b to the first and second output disks 12a and 12b, and at this time, the first and second power rollers 14a and
By controlling the tilt of the first and second power rollers 14a and 14b, the speed ratio according to the tilt angle of the first and second power rollers 14a and 14b is controlled between the first input disk 10a and the first output disk 12b. , Between the second input disk 10b and the second output disk 12b. Note that the first and second
The support mechanism includes a piston 66 and oil chambers 68a and 68b.

FIG. 2 is a sectional view taken along the line II-II of FIG. The first roller supporting member 40 of the first continuously variable transmission mechanism 6 has a needle bearing 64 at the upper and lower rotating shaft portions 62a and 62b.
a and 64b are provided so as to be rotatable and vertically movable. The needle bearing 64a is supported by a link (first link) 44, and the link 44 is a plate-shaped member (fixed member) 52 fixed to the casing 46.
Via a link post (first link post) 48.

Although not shown, the central portion of the plate-shaped member 52 along the direction of the axis P of the main shaft 4 is partially thin, and the force applied to the casing 46
The rigidity of the casing 46 and the plate-shaped member 52 is designed so that the force applied to the plate-shaped member 52 is substantially equal.

A first roller support member 42 having basically the same configuration as the first roller support member 40 is disposed on the right side of FIG. 2 with respect to the first roller support member 40. The 42 spherical bearing 70a is connected to the link 44 connected to the first roller support member 40, and is fixed to and supported by the casing 46 via the link post 48 and the plate-shaped member 52. This restricts the relative positional relationship between the pair of first roller support members 40 and 42, and prevents the pair of first roller support members 40 and 42 from moving away from each other.

The link post 48 of the first continuously variable transmission mechanism 6 and the link post 49 of the second continuously variable transmission mechanism 8 are provided integrally with the plate-shaped member 52. Casing 4 by bolt 54
6 is fixed to the upper wall.

A needle bearing 6 for supporting the rotating shaft portion 62b of the first roller supporting member 40 so as to be vertically movable.
4 b is supported by a connecting member 60, and the connecting member 60 is connected to a link post (first link post) 65 fixed to the valve body 56. In addition,
The first roller support member 40 has an extension shaft portion 63 provided concentrically with the rotation shaft portion 62a, and the extension shaft portion 63 is configured to rotate integrally with the rotation shaft portion 62b.
A piston 66 is provided on the outer periphery of the extension shaft portion 63,
Oil chambers 68a and 68b are formed above and below the piston 66, and the piston 66 moves up and down by hydraulic pressure acting on the oil chambers.

Similarly to the link post 65 fixed to the valve body 56 of the first continuously variable transmission mechanism 6, the second continuously variable transmission mechanism 8 is also provided with a link post 67 fixed to the valve body 56. These are connected to the connecting member 60.

This connecting member 60 is, as shown in FIG.
The portion 60a, 60b along the direction of the axis P of the main shaft 4 has a small thickness, and is formed of an integral member having a square shape in a plan view, and a force applied to the valve body 56,
The rigidity of the valve body 56 and the connecting member 60 is designed so that the force applied to the connecting member 60 is substantially equal.

Next, the operation of this embodiment will be described. At the transmission ratio on the High side, a compressive force in the direction of the axis P acting to approach the link posts 48 and 65 of the first continuously variable transmission mechanism 6 and the link posts 49 and 67 of the second continuously variable transmission mechanism 8 acts, At the transmission ratio on the side, the force in the direction of the axis P acts to spread the link posts 48 and 65 of the first continuously variable transmission mechanism 6 and the link posts 49 and 67 of the second continuously variable transmission mechanism 8.

However, in this embodiment, the casing 46
The rigidity of the casing 46 and the plate-shaped member 52 is designed so that the force applied to the plate 46 and the force applied to the plate-shaped member 52 are substantially equal. To cancel out the internal forces. Also, the valve body 5 is so adjusted that the force applied to the valve body 56 and the force applied to the connecting member 60 are substantially equal.
6 and the connecting member 60 are designed to be rigid, so that the valve body 56 and the connecting member 60 cancel out the compressive force and the expanding force. For this reason, no force acts on the support portions of the link posts 48 and 65 of the first continuously variable transmission mechanism 6 and the link posts 49 and 67 of the second continuously variable transmission mechanism 8.

As a result, the torsional rigidity of the casing 46 does not decrease, so that the first and second continuously variable transmission mechanisms 6, 6 are provided.
8, the gear mechanisms such as the output gear 18 and the drive gear 26 are positioned and supported by the casing 46 having a predetermined rigidity. Does not occur, and the gear life does not decrease. Further, the casing 46 and the plate-shaped member 52, and the valve body 56 and the connecting member 6
By receiving the force half and half at 0, the force can be received in a well-balanced manner even when a large force is applied. Regarding the durability, the durability of either member does not become extremely short. The overall durability is improved.

Since the rigidity of the casing and the valve body is not excessively increased, the weight of the casing and the valve body does not increase so much, the entire transmission does not become heavy, and the fuel efficiency, acceleration performance and assemblability are improved. Can be.

[0028]

As described above, according to the friction wheel type continuously variable transmission according to the first aspect, when the transmission ratio on the High side is the first,
An axial compressive force of the rotary shaft that acts to bring the link post of the continuously variable transmission mechanism and the link post of the second continuously variable transmission mechanism closer together acts on the link post of the first continuously variable transmission mechanism. An axial force is applied so that the link posts of the second continuously variable transmission mechanism tend to spread. However, the first link post and the second link post are integrally formed via a fixing member, and the rigidity and the rigidity of the fixing member are increased. Since the rigidity of the casing is set to be substantially equal, the fixing member and the casing cancel out the compressive force and the expanding force. Therefore, no force acts on the support portions of the link post of the first continuously variable transmission mechanism and the link post of the second continuously variable transmission mechanism, and the lack of rigidity of the casing itself is eliminated, thereby reducing the noise and life of the gear. Solving the problem, preventing gear shifting instability, and reducing the weight of the entire transmission can improve fuel economy, acceleration performance, and assemblability.

Also, According to the friction wheel type continuously variable transmission according to claim 2, a first link post for supporting a pair of first roller support members respectively supporting the pair of first friction rollers on a casing or a valve body; A second link post for supporting the pair of second friction rollers on a casing or a valve body; and a connecting member for connecting the first link post and the second link post, and a rigidity of the connecting member. And the rigidity of the casing or the valve body are set to be substantially equal, so that the connecting member and the casing or the valve body cancel out the compressive force and the expanding force. Therefore, no force acts on the support portions of the link post of the first continuously variable transmission mechanism and the link post of the second continuously variable transmission mechanism, and the same effects as those of the first aspect can be obtained.

Further, according to the third aspect of the present invention, since the connecting member also has a function of positioning the pair of first roller supporting members and the pair of second roller supporting members, the stepless transmission is performed. The assemblability of the machine can be further improved.

[Brief description of the drawings]

FIG. 1 is a view showing a friction wheel type continuously variable transmission according to the present invention.

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

FIG. 3 is a view showing a shape of a connecting member for connecting a first link post and a second link post according to the present invention.

[Explanation of symbols]

 6 first continuously variable transmission mechanism 8 second continuously variable transmission mechanism 10a first input disk 10b second input disk 12a first output disk 12b second output disk 14a a pair of first friction rollers 14b a pair of second friction rollers 44, 50 Link 46 Casing 48, 49, 65, 67 Link post 52 Plate member (fixing member) 56 Valve body

Claims (3)

[Claims] 1. A first continuously variable transmission mechanism including a first input disk, a first output disk, and a pair of first friction rollers that frictionally contact both disks, and a second input disk, a second output disk, and both disks. A second continuously variable transmission mechanism comprising a pair of second friction rollers in frictional contact is coaxial with each other, and the first and second continuously variable transmission mechanisms are arranged such that the arrangement of the first and second input disks in the axial direction is opposite to each other. And the first
In a friction wheel type continuously variable transmission, an input disk and a second input disk are connected so as to rotate integrally, and a first output disk and a second output disk are connected so as to rotate integrally. A first link for connecting a pair of first roller support members respectively supporting the friction rollers at both ends thereof to regulate a mutual positional relationship, and a first link for supporting an intermediate portion of the first link to a casing. A link post, a second link connecting a pair of second roller support members respectively supporting the pair of second friction rollers to regulate a mutual positional relationship at both ends thereof, and an intermediate portion of the second link. A second link post for supporting the casing with the first link post and the second link post.
A friction wheel type continuously variable transmission, wherein the link post and the rigidity of the casing are set to be substantially equal to each other through an integral structure via a fixing member. 2. A first continuously variable transmission mechanism including a first input disk, a first output disk, and a pair of first friction rollers that frictionally contact the two disks, and a second input disk, a second output disk, and both disks. A second continuously variable transmission mechanism comprising a pair of second friction rollers in frictional contact is coaxial with each other, and the first and second continuously variable transmission mechanisms are arranged such that the arrangement of the first and second input disks in the axial direction is opposite to each other. And the first
In a friction wheel type continuously variable transmission, an input disk and a second input disk are connected so as to rotate integrally, and a first output disk and a second output disk are connected so as to rotate together, A first link post for supporting a pair of first roller support members each supporting one friction roller on a casing or a valve body, and a first link post for supporting the pair of second friction rollers on a casing or a valve body. A second link post, and a connecting member for connecting the first link post and the second link post, wherein the rigidity of the connecting member and the rigidity of the casing or the valve body are set substantially equal. Friction wheel type continuously variable transmission. 3. The friction wheel type vehicle according to claim 2, wherein the connecting member also has a function of positioning the pair of first roller supporting members and the pair of second roller supporting members. Step transmission.