JPS6126668Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicular auxiliary transmission that is disposed on the input side or output side of a manual gear transmission.

As one of this type of vehicle auxiliary transmission,
A sun gear rotatably assembled on a first shaft rotatably assembled to a casing, and a planetary gear rotatably mounted on the first shaft so as to be capable of transmitting power and meshing with the sun gear from the outside. a carrier, a ring gear disposed coaxially and relatively rotatably with the first shaft and capable of transmitting power to a second shaft rotatably assembled to the casing, and meshing with the planetary gear from the outside;
a clutch disk that is assembled to be capable of transmitting power to the sun gear and movable in the axial direction and includes a first friction material that can be frictionally engaged with the ring gear; and a second friction material that can be frictionally engaged with a fixed member such as the casing; A piston connected to a clutch disk via a thrust bearing and capable of pushing the clutch disk in the axial direction; this piston is slidably accommodated in the axial direction, and when fluid pressure is applied inside the piston, the piston is pushed in the axial direction; A sub-transmission for a vehicle has been proposed, which includes a cylinder that moves the piston in one direction, and a spring that engages the piston and presses the piston in the other direction. Although this auxiliary transmission for vehicles can be configured to be small and lightweight, the clutch disk is always frictionally engaged and restrained by either the ring gear or a fixed member such as the casing.
There is a problem in that the load applied to the synchronizing device generally employed in manual gear transmissions becomes large.

The present invention has been developed in view of this problem, and its purpose is to reduce the load on the synchronizer and improve shift feeling by making it possible to fix the clutch disc even in a position where it does not engage with the ring gear or the fixing member. There is a particular thing.

An embodiment of the present invention will be described below based on the drawings. The figure partially shows the auxiliary transmission for a vehicle according to the present invention, and the auxiliary transmission is disposed on the input side or output side of a manual gear transmission commonly used in vehicles. The first sub-transmission
The shaft 10 is rotatably assembled to a casing 12 and supports a sun gear 14 and a carrier 16. The sun gear 14 is assembled onto the first shaft 10 so as to be rotatable and immovable in the axial direction.
6 is assembled on the first shaft 10 so as to be able to transmit power and to be immovable in the axial direction. Further, the carrier 16 rotatably supports a planetary gear 20 via a pin 18, and the planetary gear 20 meshes with the sun gear 14 from the outside.

On the other hand, the second shaft 22 of the sub-transmission is disposed coaxially and relatively rotatably with the first shaft 10, is rotatably assembled to the casing 12, and supports a ring gear 24. The ring gear 24 is the second
It is mounted on the shaft 22 so as to be able to transmit power but not to move in the axial direction, and meshes with the planetary gear 20 from the outside. A conical surface 24a is formed on the outer periphery of this ring gear 24.

Further, an annular clutch disk 26 is mounted on the sun gear 14 so as to be capable of transmitting power and movable in the axial direction. The clutch disk 26 has a conical portion 26a on its outer periphery, and a first friction member 28 that can be frictionally engaged with the conical surface 24a of the ring gear 24 is fixed to the inner peripheral surface of the conical portion 26a. A ring 32 (substantially the same as the casing 12) is fixed to the casing 12 on the outer peripheral surface of the casing 12.
A second friction material 30 that can be frictionally engaged with the inner circumferential conical surface 32a is fixed. Also clutch disk 2
6 is connected to an annular piston 36 via a thrust bearing 34. The piston 36 is
It is fitted into an annular cylinder 38 fixed to the casing 12 so as to be slidable in the axial direction.
It is pushed to the right in the figure by the fluid pressure applied through it. Further, a compression coil spring 40 whose right end is locked to the ring 32 and which is given a preload is engaged with the piston 36.
is pressed to the left in the figure by a spring 40.

Therefore, in this embodiment, the cylinder 38
A second piston 42 is provided coaxially and integrally with the second cylinder 42, and an annular second piston 44 is fitted into the second cylinder 42 so as to be slidable in the axial direction. The second piston 44 is in contact with the piston 36 at the right end in the drawing, and is pushed to the right in the drawing by the fluid pressure applied through the port B independently of the fluid pressure applied through the port A. Further, in this embodiment, an annular stopper 46 is fitted onto the cylinder 38. The stopper 46 defines the movement stroke of the second piston 44 to the right in the figure to a predetermined value δ, and this value δ is approximately half the stroke of the clutch disk 26 over which it can move. Note that the stopper 46 is connected to both cylinders 3.
8, 42 depending on the shape of the second cylinder 42.
It may also be carried out by fitting it into the

In this embodiment configured in this manner, when no fluid pressure is applied to the cylinders 38, 42 through the ports A, B, the pistons 36, 44 are in the illustrated position due to the action of the spring 40, and the clutch disk 26 is in frictional engagement with ring 32. Therefore, the sun gear 14 is fixed, and the rotation of the first shaft 10 is accelerated and transmitted to the second shaft 22. Also, the cylinder 38 is connected through port A.
When fluid pressure is applied inside the piston 36, the piston 36 moves to the right against the spring 40, and the clutch disc 2
6 is separated from the ring 32 and frictionally engages with the ring gear 24. For this reason, sun gear 14, carrier 1
6, the planetary gear 20, ring gear 24, etc. are integrally connected, and the rotation of the first shaft 10 is transmitted to the second shaft 22 at the same speed.

By the way, in this embodiment, when fluid pressure is applied only to the second cylinder 42 through port B, the second piston 44, together with the cylinder 36, clutch disk 26, etc., reaches the position where it abuts against the stopper 46. It moves against the spring 40 and is fixed. In this state, the clutch disk 26 is not frictionally engaged with the ring gear 24 and the ring 32, so the sun gear 14 and the clutch disk 26 can idle. Therefore, in this state, the load applied to the synchronizer of the manual gear transmission is reduced, and the shift feeling can be improved.

In addition, when implementing the present invention, the first shaft 10 is used as an input shaft and the second shaft 22 is used as an output shaft,
It is also possible to use the first shaft 10 as an output shaft and the second shaft 22 as an input shaft.

[Brief explanation of the drawing]

The figure is a partial sectional view showing an example of a sub-transmission for a vehicle according to the present invention. 10...First shaft, 12...Casing, 14...
... sun gear, 16 ... carrier, 20 ... planetary gear, 22 ... second shaft, 24 ... ring gear, 26 ... clutch disk, 28 ... first friction material, 30 ... second friction material, 32 ... Ring (fixing member), 34... Thrust bearing, 36...
...Piston, 38...Cylinder, 40...Spring, 42...Second cylinder, 44...Second piston, 46...Stopper.

Claims (1)

[Scope of utility model registration request] A sun gear rotatably assembled on a first shaft rotatably assembled to a casing, and a planetary gear rotatably mounted on the first shaft so as to be capable of transmitting power and meshing with the sun gear from the outside. a carrier, a ring gear disposed coaxially and relatively rotatably with the first shaft and capable of transmitting power to a second shaft rotatably assembled to the casing, and meshing with the planetary gear from the outside; a clutch disk that is assembled to be capable of transmitting power and movable in the axial direction and includes a first friction material that can be frictionally engaged with the ring gear; and a second friction material that can be frictionally engaged with a fixed member such as the casing; A piston that is connected via a thrust bearing and can push the clutch disk in the axial direction; the piston is slidably accommodated in the axial direction, and the piston is moved in one direction when fluid pressure is applied therein; A vehicular auxiliary transmission used by being disposed on the input side or the output side of a manual gear transmission, comprising a cylinder that engages with the piston and presses the piston in the other direction, A second cylinder to which a second fluid pressure independent of the fluid pressure is applied is provided coaxially with the cylinder, and a second piston that is engageable with the piston is disposed within the second cylinder. A sub-transmission for a vehicle, characterized in that a stopper is provided in the cylinder or the second cylinder to be slidably inserted in the axial direction, and to define a movement stroke of the second piston in one direction.