JP3508544B2 - Toroidal 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 toroidal type continuously variable transmission, and more particularly, it is intended to stably maintain a tilting range of a friction wheel related to gear shifting as an initial setting (design value) for a long period of time. It is a thing.

[0002]

2. Description of the Related Art As a conventional toroidal type continuously variable transmission, a structure as disclosed in Japanese Patent Application No. 9-163992 is generally used, and its concrete structure is shown in FIG. As shown, an input disk 1 and an output disk 2 are arranged facing each other along a main axis, and a support member 4 is interposed between the input / output disks 1 and 2 via a bearing.
The friction wheel 3 rotatably held is disposed on the vehicle, and the frictional engagement with the friction wheel 3 transfers the power.
When shifting, the friction wheel 3 is tilted clockwise or counterclockwise about the axis o ₂ of the support member 4 under the guidance of the links 5 installed at both ends of the support member 4 holding the friction wheel 3. By changing the transmission ratio between the input and output disks steplessly, the speed is changed in the speed-up and speed-down directions.

[0003]

In a toroidal type continuously variable transmission of this type, however, the maximum speed increasing tilt position and the maximum speed decreasing tilt are set so that a tilt larger than the designed value does not occur when the friction wheel is tilted. A maximum acceleration position restricting means 7 and a maximum deceleration position restricting means 8 having a function as a stopper having a shape as shown in FIG. 6 for restricting the tilting angle of the friction wheel at the rolling position are provided. Deceleration position regulation means 8
Since a larger tilting force is applied to the position regulating means, the position regulating means is insufficient in strength, and there is a risk that it will be deformed or fall out and further tilt from the predetermined position.

To address the above-mentioned conventional problems,
In order to increase the strength, it is possible to increase the size of the member that constitutes the position restricting means.However, when the size of such a part is increased, not only the weight of the part increases but also the shape of the support member may There is a concern that it may affect the size of the transmission itself, and its solution has been desired.

An object of the present invention is a novel toroidal type which can prevent the stopper from being deformed or dropped without increasing the size of the position regulating means for regulating the tilting of the friction wheel at the maximum tilting position in the deceleration direction. There is a proposal for a continuously variable transmission.

[0006]

A toroidal type continuously variable transmission according to a first aspect of the present invention is characterized in that an input / output disk arranged facing each other along a main shaft and frictional engagement between the input / output disks. A plurality of friction wheels that deliver power, a friction wheel support member that rotatably supports each friction wheel, and both ends of the friction wheel support members are rotatably held via bearings and these friction wheels are also supported. An upper link and a lower link connecting the support members, and a maximum speed increasing position restricting means and a maximum speed increasing position restricting means for restricting the maximum speed increasing position and the maximum speed decreasing position of the friction wheel respectively provided on at least one of the upper link and the lower link. And a deceleration position restricting means, and a toroidal type non-rotating type that shifts gears by tilting the friction wheel and the friction wheel supporting member as the friction wheel supporting member moves up and down. A transmission, the maximum deceleration position regulating means, against the receiving portion of the abutment to the friction wheel support member
It is characterized in that it has a higher supporting strength than the maximum speed increasing position regulating means by enlarging the contact area .

In the toroidal type continuously variable transmission according to claim 2 of the present invention, the maximum deceleration position regulating means is the receiving portion.
It is characterized in that the supporting strength is increased by increasing the contact length in contact with.

Further, the toroidal type continuously variable transmission according to claim 3 of the present invention, said maximum deceleration position regulating means, the
It is characterized in that the supporting strength is increased by increasing the hardness of the surface that comes into contact with the receiving portion .

[0009]

[0010]

In the toroidal type continuously variable transmission according to the first aspect of the present invention, the maximum of supporting the tilting of the friction wheel at the maximum tilting position toward the speed increasing direction and the decelerating direction of the friction wheel at the tip of the link. In providing the deceleration position restricting means, the supporting strength thereof is made higher than that of the maximum speed increasing position restricting means, so that the tilting friction wheel can be reliably supported at a predetermined position.

In the toroidal type continuously variable transmission according to the second aspect of the invention, particularly, the support strength of the maximum deceleration position restricting means is made longer while the contact length of the contact portion of the abutting friction wheel supporting member is increased. Since it is raised by enlarging the contact area with respect to the portion, the weight of the member does not increase extremely.

In the toroidal type continuously variable transmission according to a third aspect of the present invention, the contact area of the abutting friction wheel supporting member with respect to the receiving portion is enlarged and the hardness thereof is increased. Since the shape of the maximum deceleration position restricting means can be set relatively freely, the weight of the member is not involved, and the supporting strength can be increased without affecting the size of the transmission itself due to the change in shape. .

In the toroidal type continuously variable transmission according to the fourth aspect, since the cross-sectional area of the friction wheel supporting member which abuts against the receiving portion is enlarged, the same as the configuration according to the third aspect. Since the shape of the maximum deceleration position restricting means can be set relatively freely, the supporting strength can be increased without the disadvantage that the weight of the member itself increases.

The present invention will be described more specifically with reference to the drawings. FIG. 1 shows a configuration of a main part of a toroidal type continuously variable transmission according to the present invention.
Is an input disk arranged on the spindle, 2 is an input disk 1
And the output discs 3 which are arranged face to face with each other, a friction wheel 3 which transfers power by frictional engagement between the input disc 1 and the output disc 2 (a friction wheel on the opposite side is not shown), and 4 is a friction wheel 3 Is a friction wheel supporting member for rotatably supporting the shaft together with the pivot shaft 4a via a bearing 4b.

An upper link 5 is rotatably held on the upper end of the friction wheel supporting member 4 via a bearing. The upper link 5 is swingably attached to its link post 5a via a pivot 5b. ing. Reference numeral 6 denotes a lower link which is rotatably held at the lower end of the friction wheel supporting member 4 via a bearing. This lower link is also not shown in the figure, but like the upper link 5, it is swingably attached to a link post via a pivot. Has been.

Further, 7 is a maximum speed increasing position restricting means, and 8 is a maximum decelerating position restricting means. The maximum speed increasing position restricting means 7 and the maximum decelerating position restricting means 8 are friction wheels 3 as shown in FIG. It also functions as a stopper for restricting the tilting of the friction wheel 3 at the maximum tilting position toward the speed increasing direction (Hi) and the decelerating direction (Lo). FIG. 3 is a perspective view showing a main part of the link 5.

At the lower end of the friction wheel supporting member 4, there is arranged a shift control unit including a main valve body, a sub valve body, a spool, a rack shaft, a cam, etc., and a shift control unit is instructed to connect to this. By operating a hydraulic cylinder (not shown), the friction wheel supporting member 4 moves up and down, and the degree of tilting of the friction wheel 3 is changed accordingly, and continuously variable transmission is performed.

Among the position regulating means for regulating the tilting of the friction wheel, only the maximum deceleration position regulating means 8 for regulating the tilting toward the deceleration direction is made to have a higher supporting strength.
As shown in FIG. 2, the specific configuration is to increase the contact length L of the frictional support member that comes into contact with the receiving portion 9 and to increase the contact area of the maximum deceleration position restricting means 8 with respect to the receiving portion 9. Therefore, it does not significantly affect the size of the transmission itself.

As another means for increasing the support strength, the contact area of the maximum deceleration position restricting means 8 with respect to the receiving portion 9 may be enlarged, and its hardness (surface hardness may be increased as shown in FIG. However, the hardness of the member itself may be increased), and the hardness may be increased by performing a treatment such as quenching.

As described above, according to the present invention, the support strength of the maximum deceleration position restricting means of the position restricting means for restricting the tilting of the friction wheel is increased, so that an excessive load is applied during long-term operation. Even in such a case, the relative positional relationship between the position regulating means and the receiving portion does not change.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a main part of a toroidal type continuously variable transmission according to the present invention.

FIG. 2 is a view showing how stoppers are installed.

FIG. 3 is a perspective view of a link.

FIG. 4 is a diagram showing another example of the toroidal type continuously variable transmission according to the present invention.

FIG. 5 is a configuration explanatory view of a toroidal untitled transmission.

FIG. 6 is a view showing a mounting state of a stopper.

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Claims (3)

(57) [Claims] 1. An input / output disk arranged along a main shaft so as to face each other, a plurality of friction wheels that transfer power by frictional engagement between the input / output disks, and each friction wheel is rotatably supported. Of the friction wheel support member, the upper link and the lower link that rotatably hold the friction wheel support member at both ends via bearings and connect the friction wheel support members, and the upper link or the lower link. A friction wheel provided with at least one of the friction wheel and a maximum acceleration position restricting means and a maximum deceleration position restricting means for restricting the maximum acceleration position and the maximum deceleration position of the friction wheel, respectively; a toroidal type continuously variable transmission which performs a shift in tilting of the friction wheel supporting member, wherein the maximum deceleration position regulating means, friction wheel support abutting Wood
A toroidal type continuously variable transmission characterized by having a higher supporting strength than the maximum speed increasing position restricting means by increasing the contact area with the receiving portion of the . 2. The maximum deceleration position regulating means is the receiving portion.
The toroidal type continuously variable transmission according to claim 1 , which has a longer contact length for contacting with . 3. The maximum deceleration position regulating means is the receiving portion.
The hardness of the surface that comes into contact with is increased.
The described toroidal type continuously variable transmission.