Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid pump and motor in one of plural paths to or from...
Patent
1995-05-24
1999-03-30
Wright, Dirk
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid pump and motor in one of plural paths to or from...
475 80, 475 81, F16H 4704
Patent
active
058881620
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a drive transmission.
An object of the invention is to provide a new and improved drive transmission. Another object of the invention is to provide a new and improved differential gear which may be used therein.
In a vehicle such as an agricultural tractor or construction vehicle such as a front end loader vehicle it is desirable to provide a high torque to the driving wheels or tracks of the vehicle when the vehicle is stationery or moving slowly to facilitate, for example, ploughing or loader shovel filling operations. Hitherto such a facility has been provided by disposing a hydrokinetic torque converter in the transmission between a prime mover and the driving wheels or tracks of the vehicle. Use of a hydrokinetic torque converter results in power loss.
A further object of the invention is to provide a new and improved infinitely variable transmission whereby the above mentioned disadvantages are overcome or are reduced.
SUMMARY OF THE INVENTION
According to one aspect of the present invention we provide an infinitely variable drive transmission comprising input member and an output element; one element of the summing gear set, to provide a first path between the input member and the summing gear set, set to provide a second path between the input member and the summing gear set, the summing gear set having a driven member drivable by at least one further element of the summing gear set and drive transmitting means connectable between the output element of the variable speed transmission and said other element of the summing gear set.
The drive transmitting means may cause rotation of the one and other elements in the same direction.
The drive transmitting means may cause rotation of the one and other elements in opposite directions.
The drive transmitting means may be a reversing gear set connectable between the output element of the summing gear set and said one or other element of the summing gear set.
By providing said drive transmitting means the direction of rotation imparted to the other element by the output element of the variable speed transmission, which is in the same sense as the direction of rotation imparted to the other element by the input member, may be in the same or the opposite direction to the direction of rotation of the one element, as desired for any particular transmission.
The transmission preferably comprises a first clutch for connecting said output element of the variable speed transmission to said other element of the summing gear set through said drive transmitting means and a second clutch for connecting said input member to said other element of the summing gear set.
The transmission may include a third clutch for connecting said input member, in the reverse sense to the direction of rotation of the input member provided by the second clutch, to said other element.
When the first clutch is engaged and the second and third clutches are disengaged, is driven solely by the variable speed transmission. When the second clutch is engaged and the first and third clutches are disengaged "compound" forward drive is achieved, with the gear ratio being adjustable dependent upon the speed of rotation of the output element of the variable speed transmission.
When the first and second clutches are disengaged and the third clutch is engaged "compound" reverse direction drive of the driven member is provided with the speed of rotation being dependent upon the speed of rotation of the output element of the variable speed transmission.
The drive transmitting means thus acts as a mode selector permitting selection of solely variable speed transmission, drive in forward or reverse or "compound", e.g. hydromechanical drive in forward or in reverse.
The input member may rotate about a first axis of rotation and the one and other elements of the summing gear set may rotate about a second axis of rotation parallel to and spaced from the first axis of rotation.
The variable speed transmission may be a hydrostatic transmission.
The hydro
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Hicks Raymond John
Moeller Frank
Turner William Stanley
J.C. Bamford Excavators Limited
Kwon Peter T.
Wright Dirk
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