| US 7,523,609 B2 | ||
| Hydrostatic transmission | ||
| Yasuhisa Mochizuki, Amagasaki (Japan); Koji Sakata, Amagasaki (Japan); and Kazuhiro Owada, Amagasaki (Japan) | ||
| Assigned to Kanzaki Kokyukoki Mfg. Co., Ltd., Hyogo (Japan) | ||
| Filed on Jan. 24, 2007, as Appl. No. 11/626,783. | ||
| Claims priority of application No. 2006-014799 (JP), filed on Jan. 24, 2006. | ||
| Prior Publication US 2007/0169475 A1, Jul. 26, 2007 | ||
| Int. Cl. F16D 39/00 (2006.01) | ||
| U.S. Cl. 60—464 [60/488] | 8 Claims |
| 1. An HST in which a hydraulic pump unit operatively driven by a driving power source and a hydraulic motor unit arranged
spaced apart from the hydraulic pump unit and operatively driving a driving-wheel are fluidly connected by way of operation
fluid lines so as to form a closed circuit; wherein
the hydraulic motor unit is provided with motor-side operation fluid passages forming one part of the operation fluid lines;
a motor-side charge fluid passage having a first end opened to an outside to form a motor-side charge port and a second end
fluidly connected to at least one of the motor-side operation fluid passages; and a check valve interposed in the motor-side
charge fluid passage so as to allow the fluid to flow from the motor-side charge port to the one motor-side operation fluid
passage while preventing the reverse flow,
the hydraulic pump unit is provided with pump-side operation fluid passages forming one part of the pair of operation fluid
lines; a pump-side charge fluid passage having a first end opened to an outside to form a pump-side charge port and a second
end fluidly connected to at least one of the pump-side operation fluid passages; and a check valve interposed in the pump-side
charge fluid passage so as to allow the fluid to flow from the pump-side charge port to the one pump-side operation fluid
passage while preventing the reverse flow, and
the flow path resistance of a motor-side charge line for replenishing the operation fluid from a fluid source to the one motor-side
operation fluid passage through the motor-side charge fluid port is set to be smaller than that of a pump-side charge line
for replenishing the operation fluid from the fluid source to the one pump-side operation fluid passage through the pump-side
charge fluid port.
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