US 4,856,264 AGranted

Hydraulic transmission apparatus

AssigneeHonda Giken Kogyo Kabushiki Kaisha

InventorsSadanori Nishimura, Hiroshige Makita, Tomoaki Ishikawa

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Abstract

A hydraulic transmission apparatus comprises an input unit to which power from a power source is applied in a first direction, a direction changing unit hydraulically coupled to the input unit for extracting power in a second direction which is different from the first direction, and a case supporting the input unit and the direction changing unit. The input unit and the direction changing unit comprise an oil pump and an oil motor mounted respectively on one surface and another surface of the case. The case is filled with working oil for operating the oil pump and the oil motor. An operating device for a lawn mower has a first power transmitting path for transmitting power from the power source to a drive wheel, the first power transmitting path having a hydraulic transmission apparatus and a first clutch for selectively rotating and stopping the drive wheel, and a second power transmitting path for transmitting power from the power source to a grass cutter, the second power transmitting path including a second clutch for selectively rotating and stopping the grass cutter. The first clutch is independently operable. The second clutch has a mechanism for inactivating the first clutch in unison therewith when the second clutch is inactivated.

Claims7

Dependent claims

A hydraulic transmission apparatus for a vehicle having driving wheels, said apparatus comprising at least one oil pump to which power from a power source having a drive shaft is applied in a first direction, at least one oil motor hydraulically coupled to the oil pump for extracting power from said oil pump in a second direction which is different from said first direction, an output shaft for outputting the power extracted in said second direction, and a case supporting said oil pump and said oil motor, said case being in the form of a box, wherein

(A) said drive shaft is directly connected to an input shaft of said oil pump,
(B) said case is filled with working oil for operating said oil pump and said oil motor,
(C) said oil pump is mounted on a first outer surface of said case,
(D) said oil motor is mounted on a second outer surface of said case, said second surface being perpendicular to said first surface,
(E) said oil motor has a driven shaft which extends into the interior of said case,
(F) a speed reducer mechanism for transmitting power from said driven shaft to said output shaft is disposed within said case,
(G) said output shaft penetrates said case in said second direction through an inner chamber of said case which is filled with said working oil, said output shaft being operatively connected at its ends with corresponding ones of said drive wheels, and
(H) said case has a wall defining therein an inlet oil passages for communicating said working oil within said inner chamber of said case with said oil pump, an outlet oil passage for communicating said oil pump with said oil motor, and a return passage for communicating said oil motor with said working oil within said inner chamber of said case.

5 more elements

An operating device for a lawn mower having a handle, a power source, a drive wheel, a grass cutter, a first power transmitting path for transmitting power from said power source to said drive wheel, and a second power transmitting path for transmitting power from said power source to said grass cutter, said first power transmitting path including a hydraulic transmission apparatus and first clutch means operatively coupled to said hydraulic transmission apparatus for selectively inactivating the hydraulic transmission apparatus, said second power transmitting path including second clutch means for selectively cutting off said second power transmitting path,

said first clutch means being independently operable;
and
said second clutch means having a mechanism for actuating said first clutch means in unison therewith when said second clutch means is actuated.

Dependencies are inferred from the claim text.