Yanmar Co., Ltd.

Hiroshi Matsuyama

Shuji Shiozaki

Hidekazu Niu

Takeshi Oouchida

Hiroshi Masuda

Kunihiko Sakamoto

Takeshi Ouchida

Hisanori Mori

Michihiko Hara

Yukio Kubota

Shuuji Shiozaki

An engine exhaust gas purifier includes a filter, a hydraulic load mechanism, a clog detector and a forced actuation valve. The filter purifies the exhaust gas of the engine. The hydraulic load mechanism is driven by the engine's power. The clog detector detects a clogging state of the filter. The forced actuation valve forcibly increases an actuation amount of the hydraulic load mechanism. The filter is regenerated by increasing an engine load while maintaining an engine rotating speed, by increasing the actuation amount of the hydraulic load mechanism with an actuation of the forced actuation valve on the basis of detection information of the clog detector.

Exhaust gas purifier

A hydraulic circuithaving a simple structure can recover energy of fluid. Hydraulic circuitcomprises a boom cylindera hydraulic pumpa motion switchover valvea hydraulic pressure regulation systemand a recovery pipeHydraulic pumpis driven by a drive sourceso as to deliver fluid to boom cylinderMotion switchover valveis disposed between boom cylinderand hydraulic pumpso as to switch a motion of boom cylinderHydraulic pressure regulation systemadjusts a differential pressure of motion switchover valvebetween a delivery portof hydraulic pumpand a suction port of boom cylinderto a predetermined value. Recovery pipesupplies hydraulic pumpwith fluid from motion switchover valveto which the fluid is drained from a drain port of boom cylinder

Hydraulic circuit

The present invention relates to hydraulic equipment comprising input shaft () and output shaft; first and second plungers () and first and second spool valves () which are moved reciprocally axially; a cylinder block () which houses the plungers and spool valves and is rotated integrally with the input shaft; an input side swash plate () which touches the first plungers; and an output side swash plate () which touches the second plungers and is rotated integrally with the output shaft. The purpose of the present invention is to reduce number of parts concerning to the accuracy of the reciprocal movement of the first and second spool valves. Spool valve guides (and) on which guide grooves (and) slanted against axis of the rotary shaft are formed, and the first or second spool valve is engaged with a holding member (or) attached to the guide groove or the guide groove.

Hydraulic equipment

A hydraulic stepless transmission comprises a first hydraulic system. Formed in a cylinder block are first and second plunger holes that contain first and second plungers, respectively, a hydraulic closed circuit that connects the first and second plunger holes, and distributing valve holes that contain distributing valves, which switch flow direction of hydraulic fluid in the circuit. A shaft and cylinder block synchronously rotate, with the first and second plunger holes formed in parallel to the shaft, respectively, and the swash plate of the second hydraulic system is rotatably supported around the shaft. The first and second plungers are urged toward the swash plates by springs provided in the corresponding first and second plunger holes, respectively. The swash plate of the first hydraulic system is supported by an outer ring of a first combined thrust and radial bearing that supports the shaft, and the swash plate of the second hydraulic system is supported by an outer ring of a second combined thrust and radial bearing that supports the shaft. The movement of inner rings of the first and second combined thrust and radial bearings in an axial direction to the shaft is regulated.

Hydraulic stepless transmission and power transmission

A hydraulic continuously variable transmission has a variable displacement type first hydraulic system having a first plunger and a plunger abutting section which actuates the first plunger, and a second hydraulic system having a second plunger and provided with an output rotary section which rotates with abutment on the second plunger. A cylinder block rotates about an axis and has a first plunger hole and a second plunger hole which respectively retain the first and second plungers. A hydraulic closing circuit connects the first and second plunger holes and circulates a working oil between the first and second plunger holes. The continuously variable transmission has a distributing valve for controlling circulation of the working oil in the hydraulic closing circuit, a valve hole, formed in the cylinder block, for retaining the distributing valve, and a shaft which penetrates the cylinder block. The shaft and the cylinder block rotate synchronously and the output rotary section is rotatably supported around the shaft. The valve hole is formed in parallel to the shaft, and restriction means is arranged inclined with respect to the shaft and rotates in synchronism with the cylinder block to reciprocate the distributing valve with the distributing valve being restricted.

Growing community of inventors

Osaka, Japan

Hiroshi Matsuyama