JPH0744504Y2 - 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 four-wheel drive transfer device for an automatic transmission is, for example, one shown in FIG.

In FIG. 3, 41 and 42 are casings and 43 is a casing 4
A main shaft rotatably supported by 1, 42, 44 a planetary gear mechanism, and 45 a switching mechanism for switching the planetary gear mechanism 44 to low or high. In addition, 46 is a wet multi-plate clutch mechanism for changing 2-4 drive switching and transmission torque, 47 is a drive sprocket connected to the wet multi-plate clutch mechanism 46, and 48 is connected to the drive sprocket 47 through a chain 49. Driven sprocket, 50 is a front drive shaft integrally formed with driven sprocket 48.

The rotational force of the main shaft 43 is switched to low or high by the switching mechanism 45 via the planetary gear mechanism 44, is transmitted to the drive sprocket 47 via the wet multi-plate clutch mechanism 46, and is transmitted from the drive sprocket 47 to the chain 49 and driven. It is transmitted to the front drive shaft 50 via the sprocket 48. In this way, the rotational force is transmitted from the front drive shaft 50 to the front wheels, and a four-wheel drive traveling state is set.

Here, the automatic transmission (hereinafter referred to as A /
In the combination with T), the line pressure pipe 51 is arranged inside the transfer device (hereinafter, T / F) as shown in the figure in order to receive the line pressure from the A / T. This line pressure pipe
The line pressure from 51 drives piston 52.

On the other hand, since the A / T and T / F are integrated chambers, the oil is drawn into the T / F and the oil level of the A / T decreases. Due to this decrease in A / T oil level, aeration occurs,
In addition, the line pressure fluctuates.
Use the oil gutter (not shown) to A /
I was trying to return it to T.

[Problems to be solved by the invention] However, in such a conventional A / T transfer device, in order to prevent the oil level of the A / T from being lowered, the oil lifted by the chain is oil guttered. There was a problem that oil gutter was needed because it was returned to A / T using.

The present invention has been made in view of the above conventional problems, and an oil gutter is obtained by fixing a pipe at a predetermined position in a T / F, and by deforming the pipe to form an oil gutter at the upper portion. It is an object of the present invention to provide a transfer device that does not require the above.

[Means for Solving the Problems] In order to achieve the above object, the present invention transmits the rotational force of a main shaft rotatably supported by a casing from a sprocket to a front drive shaft via a wet multi-plate clutch mechanism. In the automatic four-wheel drive transfer device for automatic transmission, a pipe is fixed at a predetermined position in the transfer device, the pipe is deformed, and an upper part thereof serves as a gutter for returning oil to the automatic transmission.

[Operation] In the present invention, the pipe is fixed at a predetermined position in the T / F, the pipe is deformed, and the upper part serves as an oil return gutter. It flows back to the A / T to prevent the A / T oil level from decreasing.

Therefore, oil gutter is unnecessary, and the cost can be reduced.

[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 7 is a planetary gear mechanism. The planetary gear mechanism 7 is composed of a sun gear 8, a ring gear 9, a carrier 10 rotating on the same axis as these, and a planetary gear 11 supported by the carrier 10. There is. A switching mechanism 12 switches the planetary gear mechanism 7 to low (L) or high (H). The switching mechanism 12 is a hub 13 rotatably supported by the carrier 10.
And a dock gear 14 splined to the carrier 10
And a clutch gear 16 fixed to the casing 15, a coupling sleeve 17 meshing with the clutch gear 16, and a fork 18 for moving the coupling sleeve 17.

Reference numeral 19 denotes a wet multi-plate clutch mechanism that changes 2WD-4WD switching and the transmission torque. The wet multi-plate clutch mechanism 19 is a drum 20 splined to the main shaft 3 and a splined inner circumference of the drum 20. Plate 21 and hub 23 splined to drive sprocket 22
It comprises a plate 24 splined to the hub 23 and a piston 25 for pressing these plates 21, 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 denotes a pump housing, and an oil pump 34 including an inner gear 32 and an outer gear 33 is provided in the pump housing 31, and the oil pump 34 supplies lubricating oil to the oil passage 6.

In addition, an introduction passage 36 for introducing oil for driving the piston 25 is provided in the cover 35 in contact with the pump housing 31.
Is formed, and the introduction passage 36 communicates with the piston liquid chamber 37.

Here, 38 is a line pressure supply pipe (pipe) provided inside the T / F, the left end side of the line pressure supply pipe 38 is fixed to the bottom wall inside the casing 1, and the right end side thereof is fixed to the side wall. ing.

As shown in FIG. 1, the line pressure supply pipe 38 is deformed into a gutter shape to form a line pressure flow passage 39 inside, and its upper portion collects the oil scraped up by the chain 27. , A passage 40 for returning oil to the A / T.

Next, the operation will be described.

The line pressure from the A / T flows through the line pressure passage 39 of the line pressure supply pipe 38, is introduced into the introduction passage 36, and is supplied to the piston liquid chamber 37. The line pressure supplied to the piston liquid chamber 37 operates the piston 25, and the wet multi-plate clutch mechanism 19 is engaged.

On the other hand, the oil lifted up by the chain 27 is collected in the passage 40 above the line pressure supply pipe 38 as shown by the arrow, flows through the passage 40, and returns to the A / T. Therefore, A
/ T Oil level can be prevented from lowering.

In this way, since the line pressure supply pipe 38 also functions as an oil gutter, the oil gutter is unnecessary and the cost can be reduced.

In addition, although the case where the line pressure supply pipe 38 is used as the oil return pipe has been described in the present embodiment, the present invention is not limited to this, and the lubricating oil from the A / T and the power air (negative pressure) are used. It may be a tube for protecting wiring of electrical equipment.

[Effects of the Invention] As described above, according to the present invention, the pipe fixed at a predetermined position inside the T / F is deformed into a gutter shape, and the upper part of the pipe serves as a gutter for returning oil to the A / T. Therefore, the oil gutter is unnecessary, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a pipe showing an embodiment of the present invention, FIG. 2 is a sectional view of a transfer device, and FIG. 3 is a sectional view showing a conventional example. In the figure, 1,2,15: Casing, 3: Main shaft, 4,5,29,30: Bearing, 6: Oil passage, 7: Planetary gear mechanism, 8: Sun gear, 9: Ring gear, 10: Carrier, 11: Planetary gear,
12: Switching mechanism, 13: Hub, 14: Dock gear, 16: Clutch gear, 17: Coupling sleeve, 18: Fork, 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, 32: inner gear, 3
3: Outer gear, 34: Oil pump, 35: Cover, 36: Introduction passage, 37: Piston fluid chamber, 38: Line pressure supply pipe (pipe), 39: Line pressure passage, 40: Oil return passage.

Claims (1)

[Scope of utility model registration request] 1. A four-wheel drive transfer device for an automatic transmission, wherein a 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. Fix the pipe that communicates inside the automatic transmission,
A four-wheel drive transfer device, characterized in that the pipe is deformed and an upper portion thereof is used as an oil return passage for returning lubricating oil to the automatic transmission.