Kabushiki Kaisha Komatsu Seisakusho

Shingo Ota

Ryoichi Maruyama

Tsutomu Ishino

Masaru Nakamura

Teruo Nakahara

A response control system for a hydrostatic-mechanical transmission. In this system, it is determined in digging/moving operation whether an actual speed ratio which is the ratio of the revolution speed of the output shaft to the revolution speed of the power source is equal to a specified value or less, and if so, a target speed ratio which is a target value for the ratio of the revolution speed of the output shaft to the revolution speed of the power source is set, limiting the amount of change in the target speed ratio per unit time. Based on the target speed ratio thus set, the angle of at least either of discharge controlling swash plates is controlled, thereby reducing vehicle acceleration at the primary stage of digging. In order to slow down the response to a change in load during digging operation, a constant indicating the response to a change in engine revolution is set small in proximity to a target engine revolution speed. With this arrangement, the response of the transmission to a change in load during digging operation can be retarded.

Response control system for hydrostatic-mechanical transmissions

A vehicle inching mechanism is interlocked with a braking mechanism so as to overlap their operating ranges without hampering the low-speed start or stop of the vehicle by the inching mechanism. An inching pedal and a brake pedal are mounted side by side on a stationary shaft via sleeves rotatably fitted thereover and linked to an inching valve and a brake master cylinder, respectively. The sleeves have square jaws at their opposed ends for mating engagement, with clearances therebetween to allow rotation of either sleeve relative to the other within limits. A torsion spring is anchored at one end to the inching pedal sleeve and held at the other end against an abutment on the brake pedal sleeve. Upon depression of the inching pedal, therefore, not only the inching valve but also the brake master cylinder is activated, first through the torsion spring and then through the intermeshing jaws. The depression of the brake pedal results only in the actuation of the master cylinder.

Vehicle inching mechanism interlocked with a braking mechanism

An operating force transmitting apparatus adapted to be used for brake or clutch operation of a vehicle which is capable of reducing required operating force. The apparatus comprises a pair of brackets fixedly secured to a vehicle frame, a first shaft mounted on said pair of brackets, a first cylinder rotatably mounted on the first shaft, the first cylinder having an operating member and a lever fixedly secured thereto, a cam follower mounted for rotation on the lever, a second shaft mounted on the pair of the brackets, a second cylinder rotatably mounted on the second shaft, a cam link fixedly secured to the second cylinder, and a spring for urging the cam link to always contact with the cam follower.

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Osaka, Japan

Shingo Ota