JPH0345259B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an automobile transmission device comprising a continuously variable V-belt transmission device and a coupling device (forward/reverse coupling device) for driving the automobile forward and backward. A coupling device is mounted between the input shaft of the transmission and the V-belt transmission and includes a planetary gearing for reversing the direction of rotation so as to be able to drive the vehicle rearwardly; comprises a sun gear, a planetary pinion fixed to the carrier, and an annular member having internal teeth, while the coupling device further includes a first clutch plate connected to the annular member and engaged during forward drive. and,
and a second clutch plate for reversing the direction of rotation of the output shaft of the transmission by the planetary gearing when held in a fixed position.

Such a transmission is disclosed in UK patent application no. 2033029
Already known from the specification no. In the said British Patent Application, the coupling device comprises a hydraulic coupling for driving a motor vehicle from a standstill such that the two plate clutches are already engaged and disengaged before the vehicle is driven. however,
It is also possible to omit the fluid coupling and to bias the plate clutch so as to obtain good driveability.

The use of a wet plate clutch ensures dissipation of energy in the slip condition through liquid cooling when driving the vehicle from rest.

A disadvantage of the design according to said British patent application is that the front clutch plate, planetary gear set and rear clutch plate are connected to the engine (input shaft) of the vehicle and the V-belt transmission.
Since they are arranged side by side with the next pulley, the size in the axial direction becomes considerably large.

It is an object of the invention to provide a transmission of the type described in the introduction with a coupling device of small axial size.

According to the invention, this object is achieved by providing the carrier with an inner planetary pinion meshing with the sun gear and an outer planetary pinion meshing with the annular member, while interlocking said inner planetary pinion and said outer planetary pinion with one clutch plate. is mounted radially around said annular member and the other clutch plate is mounted radially around said one clutch plate so as to be axially movable but non-rotatable relative to said one clutch plate. achieved by.

Incorporating the inner and outer planetary pinions into the planetary gear train in another known manner makes it possible to ensure that substantially equal transmission ratios are maintained when reversing the direction of rotation.

When the inner clutch plate is engaged, it remains fixed relative to the carrier and sun gear, restraining the planetary gear set in a relative sense and thus causing the whole to rotate. By keeping the outer clutch plate fixed, the annular member also remains fixed so that the sun gear and carrier rotate at substantially the same speed but in opposite directions. Such a shifting mechanism for driving a vehicle forward and backward is described in British Patent Application No.
It is known from specification no. 2058251. This British patent application describes a design in which the annular member can be held fixed by a friction surface mounted radially around it.

The outer clutch plate is arranged to be axially movable and non-rotatable relative to the inner clutch plate. These clutch plates can be brought into independent engagement with each other simply by a slight axial displacement. can.

Furthermore, a reversing device for marine engines is known from U.S. Pat. No. 3,728,913, in which the annular member is frictionally engaged via a fixed device or a device rotating with the carrier. It has a face.

Further, according to the invention, the planetary gearing can include a helical gear, the annular member can include an axial bearing, and the inner clutch plate can be connected to the annular member and can be displaced in the axial direction. can be done. To reduce noise levels,
Helical gears are widely used in motor vehicle transmissions and therefore require sufficient axial support for the axial forces generated during torque transmission. In order to provide such axial support independent of the inner clutch plate, it is essential that the inner clutch plate is axially displaceable relative to the annular member.

According to a further feature of the invention, the input shaft can be coupled to a sun gear and the carrier is
Can be connected to a belt transmission.

In order to explain the invention, one embodiment of the transmission device will be described below with reference to the accompanying drawings. The accompanying drawing is a schematic representation of some of the components of the transmission, namely the input shaft 1, the coupling device 2 and the infinitely variable V-belt transmission 3.

The coupling device 2 comprises a planetary gear train with a sun gear 4 connected to the input shaft 1 . An inner planetary pinion 6 and an outer planetary pinion 7 are fixed to the planetary carrier 5 . The inner planetary pinion 6 meshes with the sun gear 4, and the outer planetary pinion 7 meshes with an internally toothed annular member 8 connected to the inner clutch plate 9. The inner planetary pinion 6 and the outer planetary pinion 7 are in mesh with each other, so that the sun gear 4 and the planetary carrier 5 rotate in opposite directions when the annular member 8 remains stationary. The inner clutch plate 9 is surrounded by an outer clutch plate 10 by means of splines. The outer clutch plate 10 is an inner clutch plate,
That is, it can be displaced in the axial direction with respect to the first clutch plate 9. In addition, a device 11 connected to the planetary carrier 5 is provided for engaging the inner clutch plate 9, and a fixed device 12 is provided for engaging the outer clutch plate 10.

A conical sheave 21 to which an infinitely variable V-belt transmission 3 driven via a coupling device 2 is fixed and a conical sheave 2 that is axially displaceable
2, and a secondary pulley 23 consisting of a fixed conical sheave 24 and a conical sheave 25 movable in the axial direction. 1
The secondary pulley 20 and the secondary pulley 23 are interconnected by a V-belt 26. By changing the rotation radius of the V-belt 26 around the primary pulley 20 and the secondary pulley 23, the difference in rotation speed between the two pulleys 20 and 23 can be changed steplessly.

A coupling device 2 with which the input shaft 1 can be connected to the engine of the motor vehicle is capable of driving the motor vehicle forward (via the inner clutch plate 9) and rearward (via the outer clutch plate 10) from a standstill. can. In order to drive the motor vehicle forward, a device 11 connected to the planetary carrier 5 can be engaged with the first clutch plate 9. For this purpose, the device 11 and the first clutch plate 9 can be adjusted, for example, in such a way that the applied force is proportional to the rotational speed of the input shaft 1. As long as the inner clutch plate 9 is fully engaged, the sun gear 4, the planetary pinions 6, 7 and the annular member 8 are mutually restrained;
As a result, the primary pulley 20 of the V-belt transmission 3 is driven at the same speed and in the same direction as the input shaft 1, and the vehicle moves forward.

In order to be able to drive the motor vehicle with the reversing device, the fixed engagement device 12 can stop and hold the outer clutch plate 10, so that the annular member 8 is kept in a stationary position and the V-belt transmission 3
The primary pulley 20 of is driven in the direction opposite to the direction of rotation of the input shaft 1.

FIG. 2 shows the coupling device 2 of FIG. 1 in more detail. As shown in the figure, the fixed engagement device 12 includes a pressing plate 27 and a cylinder 31 that are solid with respect to the housing of the transmission device, a piston 30 provided in the cylinder 31, and a piston 30 provided in the cylinder 31.
A pressing plate 34 fixed at 0 is provided. Engagement device 1
1 is a pressing plate 28 fixed to the carrier 5;
and a cylinder 33, a piston 32 provided in the cylinder 33, and a pressing plate 38 moved by the piston 32. The inner clutch plate 9 and the outer clutch plate 10 are each provided with two plates 36 and 35 on both sides. Clutch plate 9 and clutch plate 10 are provided with teeth that engage in position 37 to prevent them from rotating relative to each other, but to allow them to move axially relative to each other (left and right in the figure). ing.

When hydraulic pressure is applied in the cylinder 31, the piston 30 moves to the left while pushing the pressure plate 34 to the left, and as a result, the outer clutch plate 10 engages with the engagement device 2 via the two plates 35. and fixed.
At this time, the clutch plate 10 moves to the left. On the other hand, when hydraulic pressure is applied within the cylinder 33, the piston 32 moves to the right while pushing the plate 38 to the right, and as a result, the clutch plate 9 is connected to the engagement device 11 via the two plates 36. engage. At this time, the clutch plate 9 moves to the right.

In this way, clutch plate 9 and clutch plate 10 can be operated independently of each other in the axial direction.
Therefore, the engagement device 1 due to poor hydraulic pressure adjustment, etc.
There is no fear of interference between 1 and 12, and a design with a higher degree of freedom is possible.

[Brief explanation of drawings]

FIG. 1 is a schematic view showing the general construction of a transmission device according to the invention, and FIG. 2 is a sectional view showing the coupling device 2 of FIG. 1 in more detail. 1...Input shaft, 2...Coupling device, 3...
... V-belt transmission, 4 ... Sun gear, 5 ... Carrier, 6 ... Inner planetary pinion, 7 ... Outer planetary pinion, 8 ... Annular member, 9 ... Inner clutch plate, 10 ... Outer clutch plate .

Claims (1)

[Scope of Claims] 1. An automobile transmission device comprising at least an input shaft, an output shaft, a continuously variable V-belt transmission device, and a forward/reverse coupling device, wherein the coupling device connects the input shaft and the coupling device. A planetary gear device is installed between the stage variable V-belt transmission device and for reversing the rotation direction, and the planetary gear device includes a sun gear, an annular member having teeth on the inside,
and a carrier provided with an inner planetary pinion meshing with the sun gear and an outer planetary pinion meshing with the annular member, wherein the inner and outer planetary pinions mesh with each other, and the coupling device is coupled to the annular member. A transmission for an automobile, further comprising a first clutch plate that is engaged during forward drive and a second clutch plate that allows the direction of rotation of the output shaft to be reversed by a planetary gear set in a rest position. The first clutch plate is mounted radially about the annular member and the second clutch plate is axially movable but non-rotatable relative to the first clutch plate. An automobile transmission device characterized in that it is mounted radially around the circumference. 2. The transmission device according to claim 1, wherein the planetary gear set includes a helical wheel, the annular member includes an axial bearing, and the first clutch plate is arranged relative to the annular member. A transmission device, characterized in that it is connected to the annular member in an axially movable but non-rotatable manner.