JPH034833Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a power transmission device for a vehicle.

[Prior art]

A so-called viscous coupling spring device is used as one of the power transmission devices for transmitting power to both left and right wheels of a vehicle (see Japanese Patent Laid-Open No. 58-50349). In this system, the left and right axles, which are connected to the left and right wheels respectively, are arranged so that they can rotate relative to each other on the same axis, spanning the shaft ends of a cylindrical case that inputs driving force. A sealed working chamber in which a viscous fluid is sealed is provided between the two. A plurality of resistance plates are provided in this working chamber and are alternately engaged with the inner periphery of the cylindrical case and the outer peripheries of both shafts. Power is transmitted through the resistance of the viscous fluid.

Compared to other types of power transmission devices such as gear transmission mechanisms and multi-disc friction clutches, this viscous coupling device has features such as generating less noise because it utilizes fluid resistance.

[Problem that the invention attempts to solve]

By the way, when such a viscous coupling device is installed between the left and right wheels, if one wheel slips on a rough road such as muddy or sandy ground, half of the viscous coupling device will stop working. Evacuation is performed by power transmission only to the wheel on the grounding side, and the viscous cut spring device on the idling side does not function for escape. Therefore, in order to make it possible to escape from rough roads, it was necessary to increase the capacity of the entire viscous coupling device.

The object of this invention is to provide a viscous coupling device, that is, a power transmission device for left and right wheels using resistance plates, which is compact while allowing quick escape from rough roads.

[Means to solve the problem]

In order to achieve the above object, this invention provides a case for inputting driving force, a left axle and a right axle that are coaxially arranged to be able to rotate relative to the case, and a gap between the two axles and the case. In a power transmission device for a vehicle, which is comprised of a sealed working chamber that is formed in a cylinder and filled with viscous fluid, and a plurality of resistors that are alternately engaged with the inner periphery of a case and the outer periphery of both axles within the working chamber. , left and right partition plates that are rotatably engaged with the outer peripheries of both axles in the working chamber and are movable relative to each other in the axial direction, a cavity formed between the opposing partition plates, and left and right partitions within the cavity. and a clutch that engages with each of the plates and is fastened by relative movement of the left and right partition plates.

[Effect]

In the vehicle power transmission device of this invention, the input transmitted from the case is transmitted to the left and right wheels through the left and right axles by rotating the resistance plate integrally due to the resistance of the viscous fluid. If a wheel slips due to slipping into a muddy or other rough road, relative rotation of the resistance plate occurs in the working chamber on the side that is not idling, increasing pressure, pressing the partition plate in the axial direction, and causing this to occur. The clutch is engaged by pressure. As the clutch is tightened, both the left and right partition plates are connected, and the driving force from the left axle is also transmitted to the right axle.

〔Example〕

An embodiment of the vehicle power transmission device according to this invention will be described with reference to FIGS. 1 and 2.

A case 1 into which a driving force is input is rotatably supported by a bearing (not shown) via a left side wall 3 and a right side wall 5. The right side of the case 1 and the right side wall 5 have a flange portion 7, and a ring gear (not shown) for inputting driving force is attached to this flange portion 7.

The case 1 is installed across the shaft ends of left and right axles 9 and 11 connected to both left and right wheels, and the left and right axles 9 and 11 are inserted through the left and right side walls 3 and 5.

A sealed working chamber 13 filled with viscous fluid is formed in a space surrounded by the case 1, the left and right axles 9 and 11, and the left and right side walls 3 and 5. That is, a left hub member 15 and a right hub member 17 are provided on the outer peripheries of the shaft end sides of both the left and right axles 9 and 11, which are spline-fitted and are movable relative to each other in the axial direction. These left and right hub members 15, 17 have an outer small diameter portion 15a,
17a, small diameter portions 15b, 17b on the shaft end side, and large diameter portions 15c, 17c between the two. The large diameter portions 15c, 17c and the left and right axles 9,
Snap springs 18, 18 are interposed between the circumferential surfaces of the output shafts 11 and 11 to prevent the left and right output shafts 9, 11 from coming off. On the outer periphery of the hub members 15, 17, left and right partitions 19, 21 that partition the working chamber 13 into left and right sides are in contact with the small diameter portions 15b, 17b, while the large diameter portion 15 is in contact with the small diameter portions 15b, 17b.
c, 17c are spline fitted. A gap 20 exists between the circumferential surfaces of the partitions 19, 21 and the case 1, and the working chamber 13 communicates with the left and right sides through this gap 20.

Seal members 23, 25 are interposed between the opposing circumferential surfaces of both the partitions 19, 21 and the small diameter portions 15b, 17b, and seal members 23, 25 are interposed between the opposing circumferential surfaces of the small diameter portions 15a, 17a and the left and right side plates 3, 5. Seal members 27 and 29 are interposed therebetween, and furthermore, a seal member 30 is interposed between both the partition bodies 19 and 21. In the working chamber 13 formed in a sealed manner as described above, there are partitions 19, 2.
A plurality of disc-shaped resistance plates 31 are provided which are alternately engaged with the outer periphery of the large diameter portions 15c, 17c and the inner periphery of the case 1 with the casing 1 in between.

The right partition 21 is fitted into the left partition 19 so as to be movable relative to each other in the axial direction, and a cavity 33 is provided between the partitions 19 and 21 facing each other. Inside the cavity 33, there are left and right partitions 19, 2.
A friction clutch 37 consisting of a plurality of friction plates 35 is provided as a clutch that is alternately engaged between opposing circumferential surfaces of the clutches 1 and 35 so as to be able to rotate relative to each other. In addition,
The cavity 33 is formed between both partitions 19 and 21 and the hub member 1.
5 and 17 communicate with the outside with a gap S between opposing surfaces.

Next, the operation of the embodiment configured as described above will be explained.

First, when driving straight ahead, case 1 is
rotates, the resistance plate 31 rotates integrally due to the resistance of the viscous fluid, and driving force is transmitted to both the left and right axles 9, 11, driving both the left and right wheels. Next, when turning, due to the difference in the turning distance of both wheels,
The left and right axles 9, 11 are differentially moved by a very slight relative rotation of the resistance plate 31, and can be turned smoothly. Then, after getting into a muddy or rough road,
For example, if the left wheel is spinning, try to drive only with the right wheel that is not spinning, and the working chamber 13
As the resistance plate 31 rotates relative to the inside, the pressure increases and presses the partition plates 19 and 21, and due to this pressure, the friction plate 35 of the friction clutch 17 is engaged. In conjunction with the fastening of this friction plate 35, both the left and right partition plates 1
9 and 21 are connected, and in addition to the normal driving force from the case 1, the driving force from the case 11 toward the left axle 9 is also transmitted to the right axle 11.

In this way, even if one wheel slips due to getting into muddy ground, the entire viscous coupling device functions, allowing a quick escape, and moreover, the device can be made smaller.

In the above embodiment, a friction plate was used as the friction clutch, but a cone clutch type may also be used, and a lock type clutch such as a dog clutch may also be used. Furthermore, it is also possible to insert a disc spring or the like in order to provide initial torque. Furthermore, although the resistance plate 31 is shown attached to both the left and right axles 9, 11 via the hub members 15, 17, the axles 9, 1
It may be attached directly to 1.

Furthermore, it may be used as a center differential that distributes driving force between the front wheels and the rear wheels of a four-wheel drive vehicle.

[Effect of idea]

As is clear from the above explanation, although this invention is a power transmission device that uses the resistance of viscous fluid, if one wheel slips into a muddy or other rough road and spins, the viscous cup can be used. Since the entire ring device functions and transmits driving force to the wheels on the ground side, it is possible to escape quickly and the entire device can be configured compactly.

[Brief explanation of drawings]

The drawings show one embodiment of a vehicle power transmission device according to the present invention, in which FIG. 1 is an overall sectional view, and FIG. 2 is a sectional view of a main part. DESCRIPTION OF SYMBOLS 1...Case, 9...Left axle, 11...Right axle, 13...Working chamber, 19...Left partition, 21...
...Right partition body, 31...Resistance plate, 33...Cavity part,
35...Friction plate (clutch).

Claims (1)

[Scope of utility model registration request] A case for inputting driving force, a left axle and a right axle that are coaxially arranged to be able to rotate relative to the case, and a sealed case that is formed between both axles and the case and filled with viscous fluid. In a vehicle power transmission device comprising a working chamber and a plurality of resistance plates that are alternately engaged with the inner periphery of a case and the outer periphery of both axles in the working chamber, each of the resistance plates rotates on the outer periphery of both axles in the working chamber. left and right partition plates that can be engaged with each other in the axial direction and relatively movable in the axial direction; a cavity formed between the opposing partition plates; A power transmission device for a vehicle, comprising a clutch that is engaged during movement.