Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1977-11-14
1980-01-29
Chandler, Lance
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74733, 74687, 74861, B60K 4116, F16H 4700
Patent
active
041855213
ABSTRACT:
A hydraulic circuit adjusts an infinitely variable drive ratio hydro-mechanical transmission in response to movements of operators speed and torque controls to enable precise selection of the wheel torque of a vehicle and selective variation of ground speed by changing drive ratio while the driving engine operates at a constant engine speed. Control fluid from a pump driven by the engine is used to generate a displacement signal for the hydrostatic section of the transmission. The displacement signal is limited to a value determined by an operators maximum speed selector while being modulated within that limit by means which compare actual output torque with a selected torque signal from the operators controls and which vary the displacement signal to conform output torque with that called for by the operator. The displacement signal is further modified when necessary by engine underspeed and overspeed sensing means responsive to variations in control fluid flow from the pump. Additional means sense extremes of hydrostatic section displacement and automatically shift drive range in the mechanical section of the transmission when necessary to enable continued ground speed variation by drive ratio adjustment.
REFERENCES:
patent: 2808737 (1957-10-01), Bullard
patent: 3274946 (1966-09-01), Simmons
patent: 3381472 (1968-05-01), Brown et al.
patent: 3463034 (1969-08-01), Miller
patent: 3477225 (1969-11-01), Cryder et al.
patent: 3528322 (1970-09-01), Schou
patent: 3580107 (1971-05-01), Orshansky, Jr.
patent: 3782225 (1974-01-01), Grabow
patent: 3864991 (1975-02-01), Nembach
patent: 3897697 (1975-08-01), Chambers et al.
patent: 3899957 (1975-08-01), Carlson, Jr. et al.
Caterpillar Tractor Co.
Chandler Lance
LandOfFree
Hydraulic control system for a hydrostatic-mechanical transmissi does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hydraulic control system for a hydrostatic-mechanical transmissi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic control system for a hydrostatic-mechanical transmissi will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-875687