Kabushiki Kaisha Komatsu Seisakusho

Kohei Kusaka

Takeo Kato

Yoshiaki Kato

Yasunori Ohkura

Kiyoshi Kaneko

Masaaki Ichimura

Yuuichi Anami

A hydraulically-actuated multi-step transmission is adapted to prevent the occurrence of engagement shocks of a direct-coupled or lock-up clutch associated with a torque converter. Downshifting is carried out once with the direct-coupled clutch (8) engaged when the vehicle is slowed toward a stop. This is followed by a further downshift with the accelerator released and the direct-coupled clutch disengaged.

Method of controlling a lock-up clutch during down-shifting of

Control system for selecting a retarder mode shifting pattern for a

A method for automatically changing the speed of a dump truck for use as a construction vehicle which is capable of improving the fuel cost by utilizing the engine output effectively and efficiently, improving the durability of the power transmission system and giving the driver a comfortable ride. According to this automatic speed change method, a desired, optimum speed stage which meets the loading condition of the dump truck and/or the engine output condition can be selected by using controllers each having a built-in computer.

Method of automatically changing the speed stage of a vehicle based on

Method of automatically changing the speed stage of a construction

Apparatus for detecting abnormality in speed changing system

A brake system for a construction vehicle which ensures the safety of the vehicle when it is parked on a sloping road and started again, and enables the vehicle to get away for itself from a dangerous place where it has been brought to an emergency stop. It includes a battery relay which is closed if a main switch is turned on, a parking brake switch provided with a self-holding relay, an emergency brake switch and a solenoid valve for a parking brake. The parking brake switch, emergency brake switch and solenoid valve are connected in series to a power source via the battery relay one after another. The system may further include a parking brake relay connected between the battery relay and the solenoid valve and adapted to close if the emergency brake switch is closed when an electric current can flow through the parking brake switch, and a neutralizer relay connected between the battery relay and a direction circuit for a transmission gear in the vehicle and adapted to close when an electric current can flow through the parking brake switch.

Brake system for use in a construction vehicle

A controller device for a wheeled construction machine has a variable speed lever for electrically controlling steps of speed of a transmission disposed near a steering wheel. It comprises a combination switch box disposed at the top of a steering column, a variable speed lever of a length enough for the leading end thereof to protrude slightly from the periphery of the steering wheel disposed on the left side of the combination switch box in such a manner as to approximate the steering wheel, and a control lever for turning on and off various lamps disposed protrudingly on the right side of the combination switch box. At least either of the variable speed lever and the control lever is attached to the combination switch box.

Growing community of inventors

Tokyo, Japan

Kohei Kusaka