Power transmission

Details Power transmission Power transmission

1998-03-05

1999-12-14

Marmor, Charles A

Planetary gear transmission systems or components

Variable speed or direction transmission combined with...

475249, 475 85, 180248, F16H 3708

Patent

active

06001041&

DESCRIPTION:

BRIEF SUMMARY
This application is the national phase under 35 U.S.C. .sctn.371 of prior PCT International Application No. PCT/JP 97/02330 which has an International filing date of Jul. 4, 1997 which designated the United States of America, the entire contents of which are hereby incorporated by reference.


BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to a power transmission apparatus or so-called transfer apparatus for changing over traveling mode of the vehicle between high speed mode and low speed mode or between 2-wheel drive and 4-wheel drive.
2. Background Art
This kind of the transfer apparatus includes a change-over unit for changing over traveling mode of a vehicle and an example of the change-over unit has been disclosed in, for example, Japanese Examined Patent Publication No.Hei8-14309. This known change-over unit includes a single drum member, which is driven by a motor. First and second camgrooves are formed on an outer circumference of the drum member. On the other hand, first and second shift rods are disposed on both sides of the drum member and the first and second shift rods can reciprocate in the axial direction of the drum member. The first and second shift rods have first and second shift forks for changing the driving mode of the transfer unit respectively and pin type cam followers which engage corresponding cam grooves of the drum member.
In the aforementioned change-over unit, as the drum member rotates, by the function of the first and second cam grooves and cam followers or the cam mechanism, the first and second shift rods namely the first and second shift forks are moved, so that the driving mode of the transfer unit is changed over.
The known change-over unit employs the cam mechanism for converting the rotation of the drum member to movement of the first and second shift forks. Thus, it is necessary to form the first and second cam grooves having a complicated configuration on the outer circumference of the drum member. However, working of these cam grooves is very difficult.
Due to the use of the aforementioned cam mechanism, there is no way but disposing the first and second shift rods in parallel to the axis of the drum member, so that an enlargement of the size of the transfer unit is induced.


DISCLOSURE OF THE INVENTION

An object of the present invention is to provide a power transmission apparatus which employs a simple structure, compact change-over unit so that reduction of the overall size thereof can be achieved.
The aforementioned object is achieved by a power transmission apparatus of the present invention. The power transmission apparatus comprises an input shaft for receiving a power from an engine and an intermediate shaft which is a separate member of the input shaft. A rotation of the input shaft is transmitted to the intermediate shaft through an auxiliary transmission means. The auxiliary transmission means includes a counter shaft which is parallel to the input shaft.
The rotation of the intermediate shaft is selectively transmitted to both the front and rear wheels or one of the front and rear wheels by a 2WD-4WD change-over means. The 2WD-4WD change-over means includes a center differential gear.
The power transmission apparatus further comprises a differential limiting means for restricting a differential motion of the center differential gear by use of fluid pressure, and a supply means for supplying the fluid pressure to the differential limiting means. The supply means a fluid pressure pomp which is coaxially connected to a counter shaft and is driven by the counter shaft.
The power transmission apparatus further comprises a shift actuator for operating the auxiliary transmission means and 2WD-4WD change-over means, as the aforementioned change-over unit. The shift actuator includes a first change-over member for operating the auxiliary transmission means, a second change-over member for operating the 2WD-4WD change-over means, the second change-over member disposed coaxially with the first change-over member, and a driv

REFERENCES:
patent: 4727966 (1988-03-01), Hiramatsu et al.
patent: 4819506 (1989-04-01), Matsumoto
patent: 5036940 (1991-08-01), Takemura
patent: 5320586 (1994-06-01), Baxter, Jr.
patent: 5697861 (1997-12-01), Wilson

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