Machine element or mechanism – Gearing – Interchangeably locked
Patent
1995-05-23
1997-07-29
Ta, Khoi Q.
Machine element or mechanism
Gearing
Interchangeably locked
74336R, B60K 2000
Patent
active
056512899
ABSTRACT:
A drive transmission system for a working vehicle for transmitting power of an engine to running devices through a main clutch, a main change speed device and an auxiliary change speed device is disclosed. The main change speed device includes a first group of hydraulic clutches and a group of control valves for operating these clutches. The auxiliary change speed device includes a second group of hydraulic clutches and control valves for operating these clutches. Pressure oil is supplied to selected clutches of the first and second groups of hydraulic clutches to obtain the desired speed. The drive transmission system includes a shifter mechanism for transmitting a shift command to the main and auxiliary change speed devices; a first controller operable in response to the shift command to operate one of the first control valves to a drain position which was placed in a supply position prior to transmission of the shift command, and to operate to a supply position a different one of the first control valves corresponding to the shift command; and a second controller operable in response to the shift command to operate one of the second control valves to a drain position which was placed in a supply position, and thereafter to operate one of the second control valves gradually to a supply position.
REFERENCES:
patent: 4993285 (1991-02-01), Asayama et al.
patent: 5113720 (1992-05-01), Asayama et al.
patent: 5172603 (1992-12-01), Macinnis
patent: 5407042 (1995-04-01), Fukui et al.
patent: 5429005 (1995-07-01), Fukui et al.
patent: 5487004 (1996-01-01), Amsallen
Asada Akihiro
Inamori Akio
Komori Kazushige
Kubota Hironobu
Sakamoto Shigeo
Kubota Corporation
Ta Khoi Q.
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