Hitachi Construction Machinery Co., Ltd.

Tomoharu Morita

Takeshi Shibukawa

Motoki Sato

Masahiko Ono

Hayato Masuda

Takeshi Kurihara

Makoto Henmi

Nobuo Uzawa

Shinichi Sekido

Yutaro Iwabuchi

Koki Sugiyama

Tomohiro Ueki

Taira Yamabuki

Tatsuya Ono

An abnormality diagnosis device for a planetary gear speed reducer includes a second vibration sensor attached to a housing of a hydraulic motor having an output shaft coupled to the planetary gear speed reducer. A controller computes a peak frequency Fm of the hydraulic motor and a speed of rotation of the hydraulic motor on the basis of second vibration data acquired through the second vibration sensor, compute, on the basis of the computed speed of rotation, the number of a plurality of gears included in the planetary gear speed reducer, and the number of teeth of each of the gears, characteristic frequencies fd of the plurality of gears, and determines presence or absence of abnormality in the plurality of gears on the basis of the peak frequency Fm of the hydraulic motor and amplitudes at the characteristic frequencies fd of first vibration data acquired through a first vibration sensor attached to the planetary gear speed reducer.

Abnormality diagnosis device for planetary gear speed reducer and construction machine

A traveling motor () of a reduction device () is mounted on a reduction gear () in a state protruding to an inner side in a left-and-right direction from a left side frame () and a right side frame () toward a center frame (). Moreover, a motor guard () provided on a rear side which is the other side in a front-and-rear direction of each of the side frames () and (), respectively, and covering the traveling motor () is constituted by an inner guard member () covering the traveling motor () and an outer guard member () covering the inner guard member () from an outer side.

Tracked vehicle

A planetary gear reduction mechanism is provided in a housing for making up a revolving apparatus, and the planetary gear reduction mechanism is constituted by a sun gear, a plurality of planetary gears, and a carrier. Lubricating oil for lubricating the planetary gear reduction mechanism is stored in the housing. A doughnut-shaped guide member for covering meshing portions of the sun gear and the planetary gears and for receiving the lubricating oil scattered from the meshing portions and guiding it to planetary gear bearings is provided at an upper position of the planetary gear reduction mechanism. Hence, the lubricating oil which is scattered from the meshing portions of the sun gear and the planetary gears can be efficiently guided to the planetary gear bearings through the doughnut-shaped guide member.

Revolving apparatus for construction machine

Growing community of inventors

Kasumigaura, Japan

Tomoharu Morita