US 5,570,605 AGranted

Transmission assembly for tractors

AssigneeKanzaki Kokyukoki Mfg. Co., Ltd.

InventorsHiroshi Kitagawara, Keisaku Hikishima

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Abstract

A bearing support frame (4) is disposed within a rear end portion of a tractor front housing (1) and is fixedly supported by this housing which has an internal partition wall (1a) and an open rear end. A transmission casing (2) having an open front end is fastened to the rear of the front housing and includes a primary speed change mechanism (14) which is disposed between a drive shaft (12) and change shaft (13). These shafts are supported at their front end portions by the support frame and extend forwardly of this frame. An additional speed change mechanism (9) is disposed within a rear half of the front housing and comprises a primary shaft (7), rotatable output member (10) and countershaft (11). The output member is fixedly mounted on a front end portion of the drive shaft, and a rear end portion of the countershaft is journaled by a front end portion of the change shaft. Preferably, the support frame includes therein an annular bore portion (4c) for temporarily holding the output member in position at a preassembled condition of the additional change mechanism in the front housing.

A transmission assembly for tractors which comprises:

a front housing (1) including an internal partition wall (1a) and an open rear end;
a transmission casing (2) including an open front end and being fastened to the rear end of said front housing;
a bearing support frame (4) fixedly disposed within a rear end portion of said front housing;
a primary shaft (7) extending through said partition wall and being supported by said partition wall;
an additional speed change mechanism (9) disposed within said front housing at a location behind said partition wall so as to perform a speed change transmission between said primary shaft and a rotatable output member (10) which is supported by said bearing support frame, said additional speed change mechanism including a countershaft (11) which is supported by said partition wall and by said bearing support frame;
and a primary speed change mechanism (14) disposed within said transmission casing so as to perform a speed change transmission between a drive shaft (12) and a speed change shaft (13) which are supported respectively at their front end portions by said bearing support frame, said drive shaft being drivenly connected to said rotatable output member, the improvement characterized in:
that said bearing support frame (4) is fixedly supported by said front housing (1);
that said drive shaft (12) is disposed co-axially with said rotatable output member (10) and extends forwardly of said bearing support frame (4), said rotatable output member being fixedly mounted on said drive shaft such that said rotatable output member is supported by said bearing support frame through said drive shaft;
and
that said drive speed change shaft (13) is disposed co-axially with said countershaft (11) and extends forwardly of said bearing support frame (4), a rear end portion of said countershaft being journaled by said speed change shaft such that the rear end portion of said countershaft is supported by said bearing support frame through said speed change shaft.

7 more elements

Facts

Application

08/509,155Filed 31 Jul 1995

Priority

JP 6-24465813 Sep 1994

Granted

5 Nov 1996

Term ends

Not estimatedThe source records don’t support an estimate.

Classification15 codes

F16H 57/023
Gearboxes; Mounting gearing therein: mounting or installation of gears or shafts in the gearboxes, e.g. methods or means for assembly
F16H 37/043
Change gear transmissions in group arrangement: without gears having orbital motion
F16H 61/70
Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid…
F16H 63/32
Constructional features of the final output mechanisms: gear shift yokes, e.g. shift forks

Abstract

Claims6