JPH0717565Y2 - 4-wheel drive transfer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a four-wheel drive transfer device having a wet multi-plate clutch mechanism.

[Prior Art] A conventional transfer device having a wet multi-plate clutch mechanism includes an oil pump and a DC motor for driving the oil pump in order to secure a hydraulic pressure source.

That is, the hydraulic fluid pressure is supplied from the oil pump to the piston fluid chamber by driving the DC motor, the piston is actuated to this hydraulic fluid pressure, and the wet multi-plate clutch mechanism is engaged.

[Problems to be Solved by the Invention] However, in such a conventional transfer device, when the DC motor is continuously used for a long time, energy of 50 W or more is consumed, and the battery of the vehicle is exhausted. There was a point.

The present invention has been made in view of such conventional problems, and it is an object of the present invention to provide a transfer device capable of preventing the battery of a vehicle from rising by driving a DC motor only when the vehicle is stopped. Has an aim.

[Means for Solving the Problems] In order to achieve the above object, the present invention is a wet method in which a rotational force of a main shaft rotatably supported by a casing is fastened by supplying an operating pressure to a piston liquid chamber. In a four-wheel drive transfer device that transmits from a sprocket to a front drive shaft via a multi-plate clutch mechanism, one pump gear is provided on the main shaft via a one-way clutch, and the one pump gear is used to drive the working pressure to a piston fluid. When the vehicle is stopped, the other pump gear that meshes with the one pump gear is operated by a DC motor to supply the working pressure to the piston liquid chamber.

[Operation] In the present invention, while the vehicle is traveling, one pump gear provided on the main shaft via the one-way clutch is operated to supply operating pressure to the piston liquid chamber to operate the piston.

On the other hand, when the vehicle is stopped, the DC motor operates the other pump gear that meshes with one pump gear to supply the operating pressure to the piston liquid chamber to operate the piston. During operation of the other pump gear, one pump gear idles by the one-way clutch.

Therefore, the DC motor is not used continuously for a long time, and the battery exhaustion of the vehicle can be prevented.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 are views showing an embodiment of the present invention.

First, the structure will be described. In FIG.
Is a casing, and the main shaft 3 is rotatably supported by these casings 1 and 2 via bearings 4 and 5. An oil passage 6 is formed inside the main shaft 3 to lubricate each lubrication site.

Reference numeral 19 denotes a wet multi-plate clutch mechanism for performing 2-4 drive switching and variable torque control.
19 is a drum splined to the main shaft 3.
20 and a plate splined to the inner circumference of the drum 20
21, a hub 23 splined to the drive sprocket 22, and a plate 24 splined to the hub 23,
It is composed of a piston 25 that presses these plates 21 and 24.

A chain 27 is installed between the drive sprocket 22 and the driven sprocket 26.
Is integrally formed with the front drive shaft 28.
The front drive shaft 28 is rotatably supported by the casings 1 and 2 via bearings 29 and 30.

Reference numeral 31 is a pump housing, and one pump gear 34 is provided in the pump housing 31 on the main shaft 3 via a one-way clutch 35.

As shown in FIG. 1, one pump gear 34 meshes with the other pump gear 36, and the other pump gear 36 is operated by driving a DC motor 37. In addition,
While the other pump gear 36 is operating, one pump gear 34
Rotates idly by the one-way clutch 35.

Next, the operation will be described.

While the vehicle is running, the rotation of the main shaft 3 actuates one pump gear 34 via the one-way clutch 35 to supply the working pressure to the piston liquid chamber 38, thereby causing the piston 25
To operate.

On the other hand, when the vehicle is stopped, the DC motor 37 drives the other pump gear 36 to supply the working pressure to the piston liquid chamber 38 to operate the piston 25. In this case, one pump gear 34 idles by the one-way clutch 35.

Since the DC motor 37 is driven only when the vehicle is stopped as described above, the DC motor 37 is not continuously used for a long period of time, so that the battery exhaustion of the vehicle can be prevented. Since it is not necessary to provide two oil pumps, the number of parts can be reduced.

[Advantages of the Invention] As described above, according to the present invention, one pump gear is driven via the one-way clutch when the vehicle is running, and the other pump gear is driven by the DC motor when the vehicle is stopped. As a result, the DC motor is not used continuously for a long time, and the battery of the vehicle can be prevented from running out.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention, and FIG. 2 is a sectional view of the entire apparatus. In the figure, 1,2: Casing, 3: Main shaft, 4,5,29,30: Bearing, 6: Oil passage, 19: Wet multi-plate clutch mechanism, 20: Drum, 21,24: Plate, 22: Drive Sprocket, 23:
Hub, 25: Piston, 26: Driven sprocket, 27: Chain, 28: Front drive shaft, 31: Pump housing, 34: One pump gear, 35: One-way clutch, 36: Other pump gear, 37: DC motor, 38: Piston fluid chamber.

Claims (1)

[Scope of utility model registration request] 1. A four-wheel system in which the rotational force of a main shaft rotatably supported by a casing is transmitted from a sprocket to a front drive shaft via a wet multi-plate clutch mechanism that is fastened by supplying an operating pressure to a piston liquid chamber. In the drive transfer device, one pump gear is provided on the main shaft via a one-way clutch, the one pump gear supplies operating pressure to the piston liquid chamber when the vehicle is running, and the other gear that meshes with the one pump gear when the vehicle is stopped. A four-wheel drive transfer device characterized in that a pump gear is operated by a DC motor to supply an operating pressure to a piston liquid chamber.