Kanzaki Kokyukoki Mfg. Co., Ltd.

Ryo Motooka

Koji Iwaki

Akihiro Ima

Koji Kiyooka

Hitoshi Sawada

Ken Morishita

Kazuhiro Owada

Tomoyuki Tsuji

Kohei Ogura

Takumi Takahashi

Terunobu Yoshioka

Disclosed is a power transmission unit including a motor case that is provided on the same side as a second axle with respect to a center between a first axle and the second axle, separated to right and left, in a right-left direction and that houses the electric motor, a first axle case housing a reduction gear mechanism, a differential gear mechanism, and the first axle, and a second axle case that is fixed to the first axle case in a separable manner and houses the second axle.

Power transmission unit

[Problem] A power transmission unit that improves quietness of a gear mechanism and prevents a size of the unit from increasing when a brake rotor is installed around an input shaft of the gear mechanism. [Solution] The power transmission unit includes an electric driving motor with a motor shaft, a gear mechanism, and an output shaft, which are accommodated in a transmission housing, wherein the power of the motor shaft is transmitted to the output shaft via the gear mechanism. The gear mechanism has a gear shaft rotatably supported on the transmission housing and a first helical gear provided on the gear shaft. The power transmission unit further includes a connecting member provided with a tubular portion fitted to the motor shaft and the gear shaft so as to allow the motor shaft and the gear shaft to synchronously rotate. The connecting member is integrally provided with a brake rotor on the outer periphery thereof.

A transmission structure of the present invention causes, during a period from a time point when a rotational speed of a drive rotational power reaches a predetermined first/second speed stage shift-up start speed until a first/second speed stage shift-up end time point, one of an input-side clutch mechanism pair and an output-side clutch mechanism pair to be in a double transmitting state, and causes, in the double transmitting state, a first clutch mechanism and a second clutch mechanism of the other one of the input-side clutch mechanism pair and the output-side clutch mechanism pair to be shifted to a disengagement sate and an engagement state, respectively, while having frictional plate slid.

Transmission structure

A hydromechanical continuously variable speed transmission is provided. The hydromechanical continuously variable speed transmission can include: the HSTin which the planetary gear mechanismis housed in the planetary gear support casemounted on a face of the center sectionto form the HMT unit, the face being on the side opposite to the side on which the HST caseis mounted, and the HMT unitis further provided with the housing mounting facefor fixing the HMT unitto the housingof the traveling power transmission mechanism, the housing mounting facebeing provided on the center sectionso as to surround the outer circumference of the mounting faceon which the planetary gear support caseis mounted.

Growing community of inventors

Amagasaki, Japan

Ryo Motooka