Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1981-12-16
1984-03-27
Braun, Leslie A.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74861, 74869, B60K 4110, B60K 4122
Patent
active
044386664
ABSTRACT:
Disclosed is an automatic control system for a powershift, preselect transmission (10) including a plurality of power paths (36, 38) alternately connectable between input (12) and output (20) shafts by first engaging selected ones of synchronizer clutches (42, 74, 84) associated with each of a plurality speed ratio gears (44, 46, 76, 78, 80) in each path and then alternately engaging a powershift clutch (48, 82) associated with each path. The control system includes a hydraulic logic system (118) which may be electronic and a hydraulic and shift valve system which may be electrically controlled should the logic be electronic. The control system preselects ratio gears in a nondriving path and then alternately engages the powershift clutches to switch driving connections from one path to the other. The logic system includes an improved reverse sequence valve (132) and improved shift valves (124, 126, 128). The shift valve system includes the feature of trimmer valves (364, 370, 372, 373) to control the engagement rate of the synchronizer clutches and combination trimmer valves (360, 366) to control the engagement rate of the powershift clutches.
The logic system further includes the feature of a reverse sequence valve (132') for preselecting reverse as a function of speed and independent of the shift selector position.
REFERENCES:
patent: 2974766 (1961-03-01), Perkins et al.
patent: 3908485 (1975-09-01), Miyanchi et al.
patent: 4325271 (1982-04-01), Iwanaga et al.
Andrews Stephen B.
Braun Leslie A.
Eaton Corporation
Grace C. H.
Rulon P. S.
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