JPS6188066A - Toroidal stepless speed change gear - Google Patents

Abstract

PURPOSE:To reduce a lower loss at the time of backward movement by independently providing power transmission means for backward movement and power transmission means for forward movement, whereby at the time of backward movement, power is transmitted not through a toroidal speed change portion. CONSTITUTION:In case of moving backward a car, a sleeve 16 is moved to the right, whereby the power of an input shaft 2 is transmitted to a differential device 19 not through a toroidal speed change portion, but through backward gears 4, 13, a speed reduction shaft 12 and a gear 17. Accordingly, as the input shaft 2 and an acceleration shaft 20 are rotated in opposite directions, the car can be moved backward to reduce a power loss at the time of backward movement.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a toroidal continuously variable transmission suitable as an automobile transmission.

Conventional technology and its problems Conventionally, as described in Japanese Patent Publication No. 47-1242, annular grooves are provided on opposing surfaces of input/output disks arranged on the same axis L, and the annular grooves are a toroidal transmission section having a plurality of rollers disposed therebetween; A toroidal continuously variable transmission is known, which is equipped with a second engagement drive device, and by changing the inclination of the rollers, the gear ratio can be made variable and the transmission can be switched between forward and backward movement.

However, in the case of the above-mentioned toroidal continuously variable transmission, power is transmitted to the output shaft through the toroidal transmission section not only when moving forward but also when moving backward, so at low speeds, the toroidal drive has poor transmission efficiency. However, there is a problem in that power is lost greatly when traveling backwards, and furthermore, the inclination of the rollers must be controlled even when traveling backwards, making control complicated.

Purpose of the Invention The present invention has been made in view of such conventional problems.
The purpose is to provide a toroidal continuously variable transmission that improves the transmission Qj ratio during reverse travel and eliminates the need for roller control during reverse travel.

Structure of the Invention In order to achieve the above object, the present invention independently provides a reverse power transmission means connected to the input disk of the toroidal transmission section and a forward power transmission means connected to the output disk, and transmits the power from these means. By connecting the transmission means to the following forward/reverse switching mechanism, power is transmitted without going through the toroidal transmission section when traveling in reverse.

As a result, power loss during backward movement can be reduced, and since the inclination of the rollers only needs to be controlled during forward movement, control can be simplified.

DESCRIPTION OF EMBODIMENTS FIG. 1 shows a toroidal continuously variable transmission according to the present invention.
A first embodiment applicable to a type or RR type (front engine/front drive type, rear engine/rear drive type) automobile is shown, in which an input shaft 2 connected to an engine 1 is shown.
A clutch 3 and a reverse gear 4 are provided in the middle of the vehicle for starting and for connecting/disconnecting power when switching between forward and backward travels.

An input disk 6 of a toroidal transmission section 5 is connected to an end of the input shaft 2. As is well known, this toroidal transmission section 5 consists of an input disk 6 and an output disk 7 arranged on the same axis, and a plurality of circular rings fi6a and 7a formed on opposing surfaces of both disks 6 and 7. roller 8
By rotating the roller 8 about a support shaft 8a perpendicular to the plane of the paper, the input/output disk 6
The effective diameter of 7° changes, allowing the gear ratio to be changed steplessly. The input disk 6 is placed on the opposite side of the output disk 7 from the engine 1, and the output shaft 9 connected to the center of the output disk 7 is rotatably inserted into the outer circumference of the input shaft 2. A forward gear 10 is fixed to the end of the output shaft 9.

A forward/reverse switching mechanism 11 that also serves as a speed reduction mechanism is disposed between the toroidal transmission section 5 and the engine l, and this forward/reverse switching mechanism 11 is connected to the reverse gear 4 and the forward gear 10. There is.

That is, the reduction shaft 12 of the forward/reverse switching mechanism 11 is provided with a rotatable reverse gear 13 and a forward gear 14 that mesh with the reverse gear 4 and the forward gear IO, respectively, and these gears 13.14 A spline hub 15 fixed to the deceleration shaft 12 is provided at an intermediate position. A spline gear 133.14a is integrally formed on the gear 13.14, and a sleeve 16 is slidably spline engaged with the outer periphery of the spline gears 13a, 14a and the spline hub 15, thereby allowing forward and backward movement. It is designed to switch between.

A gear 17 is attached to the end of the reduction shaft 12,
This gear 17 is a gear 22, 23 provided on another reduction shaft 21.
The gear 19 meshes with a gear 19 of a differential device 18 disposed near the forward/reverse switching mechanism 11 to transmit power to the axle shaft 20 .

In the toroidal continuously variable transmission configured as described above, in order to move the vehicle forward, the sleeve 16 may be operated to the left in the figure. As a result, the power of the input shaft 2 is transferred to the toroidal transmission section 5, the output shaft 9, the forward gear 10, 14, and the reduction shaft 1.
2 and the differential device 18 via the gear 17
Since the input shaft 2 and the axle shaft 20 rotate in the same direction, the vehicle can be moved forward.

On the other hand, when moving the vehicle backwards, the sleeve 16 is moved to the right in the figure. As a result, the power of the input shaft 2 is transmitted to the differential device 19 via the reverse gear 4.13, the reduction shaft 12, and the gear 17 without passing through the toroidal transmission section 5, and the input shaft 2 and the axle shaft 20 are connected to each other. rotates in the opposite direction, allowing the vehicle to move backwards.

, Since the toroidal transmission section 5 has the property that the input disk 6 and the output disk 7 rotate in opposite directions,
The reverse gear 4, which rotates integrally with the input disk 6, and the forward gear 10, which rotates integrally with the output disk 7, naturally rotate in the opposite direction. There is no need to provide a shaft, which has the advantage of simplifying the shaft configuration.

FIG. 2 shows a second embodiment of the present invention, which is particularly applicable to an FR (front engine/rear drive) type motor vehicle. In this embodiment, unlike the first embodiment, an input disk 6 is placed on the engine side, and a reverse gear 4 is provided at the tip of the input shaft 2 that passes through the output disk 7.

When moving forward, the sleeve 16 of the forward/reverse switching mechanism 11
is operated to the right in the figure, and the forward gear 1 of the forward/reverse switching mechanism 11 is rotated integrally with the output disk 7 from the forward gear 10.
4 to the reduction shaft 12. On the other hand, when moving backward, the sleeve 16 is operated to the left in the figure, and the input disc 6
Power is transmitted from the reverse gear 4, which rotates integrally with the rear gear, to the reduction shaft 12 via the reverse gear 13 of the forward/reverse switching mechanism 11.

In this case as well, power transmission can be performed without going through the toroidal transmission section 5 when moving backward.

FIG. 3 shows a third embodiment of the present invention, in which the FF type or R
This is an example applied to an R-type car. In this embodiment, the input disk 6 and the output disk 7 are each integrally provided with a reverse gear 4 and a forward gear 10, and these gears 4, 1
0, the reverse gear 13 and the forward gear 14 of the forward/reverse switching mechanism 11 are meshed with each other. In particular, the reverse gear 13 of the forward/reverse switching mechanism 11 also serves as a sleeve for forward/reverse switching, and when the reverse gear 13 is operated to the left in the figure, the reverse gear 13 and the input disc 6 are connected to each other. The meshing with the reverse gear 4 is disengaged, and the forward gear 1
4 is connected to the spline hub 15 of the reduction shaft 12. Therefore, the power of the input shaft 2 is transmitted from the toroidal transmission section 5, the forward gear 1O114, and the gear 17 of the reduction shaft 12 to the differential device 18 via the gears 22 and 23 of another reduction shaft 21, thereby moving the vehicle forward. Can be done.

On the other hand, when the reverse gear 13 is operated to the right in the figure,
The reverse gear 4 provided on the input disk 6 and the spline hub 15 provided on the reduction shaft 12 are connected, and the power of the input shaft 2 is transferred to the forward/reverse switching mechanism 11 without passing through the toroidal transmission section 5.
, is transmitted to the differential device 18 via the deceleration shaft 21, and the vehicle can be moved backward.

In this embodiment, the forward/reverse switching mechanism 11 is placed on the radially outer side of the toroidal transmission section 5, so that the axial dimension of the transmission can be shortened and a more compact FF or RR transmission can be achieved.

FIG. 4 shows a fourth embodiment of the present invention, in which reverse sprockets 4 are provided at approximately symmetrical positions with a toroidal transmission section 5 in between.
and a forward sprocket lO are connected to the reverse sprocket 13 and the forward sprocket 14 of the forward/reverse switching mechanism 11 via chains 24, 25. The configuration of the forward/reverse switching mechanism 11 is the first embodiment (see Fig. 1).
It is similar to In this case, as in the third embodiment, the forward/reverse switching mechanism 11 is disposed radially outward of the toroidal transmission section 5, so that the axial dimension of the transmission can be shortened.

Note that the forward/reverse switching mechanism according to the present invention is not limited to that of the above-mentioned embodiments, and may have any configuration. For example, in the embodiment described above, switching between forward and backward movement is performed by a sleeve that is spline-engaged with the outer periphery of the spline gear and the spline hub, but a hydraulic clutch may also be used.

Effects of the Invention As is clear from the above explanation, according to the present invention, power is transmitted without going through the toroidal transmission section when going backwards, so the transmission efficiency when going backwards can be improved, and the roller Tilt control and input/output disk thrust control only need to be performed when moving forward, simplifying control. Along with this, no load is applied to the toroidal transmission section when the vehicle is moving backwards, which has the effect of contributing to longer life.

[Brief explanation of drawings]

The drawing shows a toroidal continuously variable transmission according to the present invention,
1 to 4 are schematic configuration diagrams of the first to fourth embodiments, respectively. 2... Input shaft, 4... Forward gear, 5... Toroidal transmission section, 6... Input disk, 7... Output disk, 6a, ? a... Annular groove, 8... Roller, 9...
... Output shaft, 10... Reverse gear, 11... Forward/forward switching mechanism, 18... Differential device.

Claims (1)

[Claims] (1) A toroidal type continuously variable transmission equipped with a toroidal transmission section in which annular grooves are provided on opposing surfaces of input and output disks arranged on the same axis, and a plurality of rollers are arranged between the annular grooves. In the machine, a reverse power transmission means connected to the input disk and a forward power transmission means connected to the output disk are provided independently, and these power transmission means are connected to a subsequent forward/reverse switching mechanism. A toroidal continuously variable transmission characterized by transmitting power without going through a toroidal transmission section when moving in reverse.