Transmissions

Details Transmissions Transmissions

1993-11-04

1996-04-16

Marmor, Charles A.

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural outputs

475316, 74 1566, F16H 354, F16H 3706

Patent

active

055077048

DESCRIPTION:

BRIEF SUMMARY
This invention relates to transmissions and in particular, though not exclusively, to transmissions for use in tractor drive lines.
It is well known to use a planetary powershift gear unit as one element in a series connection of units which together form a tractor transmission. It is also well known to use a multi-plate oil-immersed clutch as a main transmission drive clutch in tractor applications.
It is an object of the present invention to provide a combined powershift and main clutch assembly which is suitable for use in a tractor drive line and which is particularly compact, reliable and readily installed in an existing tractor transmission housing.


SUMMARY OF THE INVENTION

A combined powershift and main clutch assembly for a vehicle transmission comprising a casing containing: driven therefrom, drivingly connecting an output member of the powershift unit with the output shaft, and within the output shaft.
The powershift unit preferably includes a secondary clutch means coaxially surrounding the input shaft within the casing for selecting the operative ratio of the powershift unit.
The powershift unit may comprise a sun gear and an annulus gear inter- connected by one or more planet gears carried on a planet carrier, one element of the said sun, annulus or carrier being connected to the input shaft, a second element of said sun, annulus or carrier acting as the output member of the powershift and the third element of said sun, annulus or carrier being clutchable by the secondary clutch means either for co-rotation with the first or a second element or to the casing of the assembly.
The carrier is preferably connected to the input shaft, the annulus gear acts as the output member of the powershift and the sun gear surrounds the input shaft and is clutchable by the secondary clutch means to either the carrier or the casing.
The carrier is preferably splined onto the input shaft by a sleeve portion which surrounds the input shaft, the power take off shaft also being splined to the same sleeve portion.
The secondary clutch means may conveniently comprise a first clutch which is spring-engaged to drivingly connect said third element to said first or second element to provide the unitary or lock-up condition of the powershift unit and a second hydraulically-engaged clutch which clutches said third element to said casing to provide a planetary ratio of the powershift unit.
The main multi-plate clutch is preferably engaged by an annular piston which surrounds the output and power-take-off shafts.


BRIEF DESCRIPTION OF THE DRAWINGS

One embodiment of the present invention will now described, by way of an example only, with reference to the accompanying FIG. 1 which is a vertical section through a tractor transmission assembly embodying the present invention.


BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to the drawing, a tractor transmission assembly 10 comprises a two-speed planetary powershift unit 11 coaxially mounted around input shaft 12 which is driven directly from an engine flywheel 13. A main multi-plate oil-immersed clutch 14 coaxially surrounds a hollow output shaft 15 within which a power-take-off (pto) shaft 16 extends. Output shaft 15 is connected to further transmission stages, for example, a synchromesh gearbox (not shown), to complete the tractor transmission.
The 2-speed powershift unit 11 comprises an input member in the form of a planet carrier 17 which is splined onto input shaft 12 via a sleeve portion 52, carrier 17 carries planet gears 18 which mesh with a sun gear 19 which rotatably surrounds the input shaft 12 and also with annulus gear 20, which acts as the output member of the powershift unit.
The operative ratio of the powershift unit is changed by a secondary clutch means in the form of a first clutch 22 which is spring engaged and a second clutch 23 which is hydraulically engaged. The first and second clutches are interlinked by a common clutch member 24 which forms part of both clutches.
Common clutch member 24 is supported on carrier 25 which is splined onto s

REFERENCES:
patent: 3487726 (1970-01-01), Burnett
patent: 4420992 (1983-12-01), Windish
patent: 4528872 (1985-07-01), Umemoto et al.
patent: 4549443 (1985-10-01), White
patent: 4649771 (1987-03-01), Atkinson et al.
patent: 4685343 (1987-08-01), Ehrlinger et al.
patent: 4788886 (1988-12-01), Nussbaumer et al.
patent: 4811614 (1989-03-01), Lasoen

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