Mazda Motor Corporation

Kobelco Construction Machinery Co., Ltd.

Noriyuki Wada

Yasuki Okadome

Shinya Tage

Kazuyuki Takeda

Masanosuke Nagamine

Yuka Nakagawa

An oil-feeding member () catches oil picked up by a gear, and is provided with a gutter () guiding the oil from one side to the other of a transmission in an axial direction. The gutter () has a bottom which is divided into a first bottom portion () and a second bottom portion (). The second bottom portion () is provided with an oil-dripping hole (). The first and second bottom portions () are configured so that (i) the oil flows over only the first bottom portion () toward the other side if an amount of the oil caught by the oil-feeding member () is smaller than or equal to a predetermined amount, and that (ii) the oil flows over both of these bottom portions () toward the other side if the amount of the oil is greater than the predetermined amount.

Structure for lubricating transmission

An oil feeding member (), catching oil picked up by a gear, includes a gutter guiding the oil from one end to the other end of a transmission in its axial direction. The gutter is comprised of a first gutter () and a second gutter (). A portion of the oil feeding member closer to the one end includes a catching wall () standing between the first and second gutters, catching the oil picked up by a speed change gear () serving as the gear, and guiding the oil into the first gutter. A transmission case () includes a guiding portion () guiding, into the second gutter, the oil picked up by the speed change gear and deposited on a ceiling surface () of the transmission case.

A guide groove including a groove section extending from the vicinity of an entrance of a main passage to a side opposite the entrance is formed on the inner circumferential surface of a main passage. The groove section is provided in an inclined fashion with respect to the axial direction such that lubricating oil inside the groove section is sent towards the side opposite the entrance by rotation of a rotary shaft in a predetermined direction. Of a plurality of subsidiary passages, the entrance of a subsidiary passage that is most distant from the entrance of a main passage is disposed in the guide groove. In a lubrication structure for a transmission, insufficient lubrication is effectively prevented in parts requiring lubrication corresponding to the subsidiary passages, irrespective of the positions of the subsidiary passages in the axial direction, while avoiding increase in the size of the transmission.

Lubrication structure for transmission

The present invention is provided with a pair of vertical plates disposed on a rotating frame, a fuel tank and a working oil tank aligned on the rotating frame in the front-back direction, hydraulic pipes for coupling a control valve provided in the working oil tank and a working actuator, and a retaining tool for retaining the hydraulic pipes between the control valve and the actuator, and the hydraulic pipes are arranged from the control valve to the retaining tool through a clearance formed between the fuel tank and the working oil tank.

Growing community of inventors

Hiroshima, Japan

Noriyuki Wada