Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow
Patent
1998-11-16
2000-08-29
Lopez, F. Daniel
Power plants
Pressure fluid source and motor
Condition responsive control of motive fluid flow
60487, 91489, 91505, F16D 3102, F01B 302
Patent
active
061090328
ABSTRACT:
A hydrostatic transmission is provided comprising a hydraulic pump and a hydraulic motor fluidly connected with each other through a closed fluid circuit. Pistons press against a control arm connected with a movable swash plate of the hydraulic pump and generate a friction force when the movable swash plate, which has been rotated slantwise, automatically returns toward the neutral position by a neutral return spring. The movable swash plate gradually returns to the neutral position by pressure of the piston. A discharging oil hole is open at the utmost end of each of the pistons for draining a portion of operating oil which operates the piston in the closed fluid circuit to the interior of a housing. Grooves are formed along a surface of the control arm abutting against the pistons. When the movable swash plate is rotated between the neutral position and a predetermined position, the discharging oil holes are connected to the interior of the housing through the grooves so as to release the oil pressure out of the closed fluid circuit. Thus, braking shock can be moderated and the neutral position can be expanded.
REFERENCES:
patent: 3837235 (1974-09-01), Peterson
patent: 4968227 (1990-11-01), Szulczewski et al.
patent: 5094077 (1992-03-01), Okada
patent: 5235810 (1993-08-01), Havens
patent: 5239827 (1993-08-01), Havens
patent: 5809781 (1998-09-01), Krantz
patent: 5836159 (1998-11-01), Shimizu et al.
Iida Masaru
Ohashi Ryota
Shimizu Hiroaki
Kanzaki Kokyukoki Mfg. Co. Ltd.
Lopez F. Daniel
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