Komatsu Corporation

Kabushiki Kaisha Komatsu Seisakusho

Daijiro Ito

Tsuyoshi Yoshida

Akira Hashimoto

Kenichi Higuchi

Takuya Tsukada

Hiroshi Imai

Hisao Asada

Hiroshi Yamamoto

Takeshi Nishide

An edge of a guide hole includes a first contact portion, a second contact portion, and a guide portion. The first contact portion is in contact with the second connecting pin while the second connecting pin is positioned in the lock actuation position. The second contact portion is in contact with the second connecting pin while the second connecting pin is positioned in the lock release position. The guide portion extends in a direction intersecting the movement direction of the second connecting pin between the first contact portion and the second contact portion. The guide portion is pressed by the second connecting pin that moves from the lock actuation position to the lock release position in order to resist the urging force of an urging member and cause the second lock member to move from the locked position to the unlocked position.

Quick coupler

A quick coupler includes a coupler body having a first hook, a lock member, a slidable second hook, a hydraulic cylinder, and a connecting pin connecting the cylinder and coupler body. The lock member is movable between locking and unlocking positions in which the lock member protrudes into and retracts from an opening of the first hook. The cylinder includes first and second end portions connected to the coupler body and the second hook, respectively. The cylinder extends and contracts to cause the second hook to slide away from and towards the first hook, respectively. The coupler body includes a support hole moveably supporting the connecting pin in an extension and contraction direction of the cylinder. The first end portion of the cylinder moves away from the second end portion within a movability range of the connecting pin to move the lock member from the unlocking to locking position.

A bush is provided at its sliding surface with oil-supply groove portions. An area ratio of the oil-supply groove portions to the sliding surface of the journal shaft is set to 30 to 90%. A length Lbetween the oil-supply groove portions in a circumferential direction and an inner diameter D of the bearing satisfy L&#x3c;&#x3c0;D/36. Even in a bearing device in which the journal shaft and the bush mutually rotate in a predetermined angle range or in which the journal shaft and the bush relatively and continuously rotate, the present invention can effectively be used while maintaining the existing sizes of the journal shaft and the bush, and it is possible to prevent partial break of oil film or shortage of oil film.

Bearing device

Circuit capable of varying pump discharge volume in closed center-load

Growing community of inventors

Hirakata, Japan

Daijiro Ito