Komatsu Corporation

Kabushiki Kaisha Komatsu Seisakusho

Seita Hayashi

Sadao Nunotani

Hideki Kado

Jun Maruyama

Mitsuru Arai

Masayoshi Mototani

Takuya Miyata

Mitsuru Oshiro

Tosiyuki Akasaka

Tadao Karakama

Shinobu Nagura

Koichi Morita

Suji Hori

A bent-axis hydraulic pump motor includes: a cylinder block, a retainer plate; and a constant velocity joint, which includes an inner joint element; an outer joint element; and a plurality of balls interposed between block-side ball grooves and shaft-side ball grooves to transmit torque between the cylinder block and the retainer plate, so that all block-side groove planes, which include respective extending axial lines of the block-side ball grooves and the inclined rotation center, are inclined with respect to an axial center of a center shaft and all drive shaft-side groove planes, which include respective extending axial lines of the shaft-side ball grooves and the inclined rotation center, are inclined with respect to an axial center of a drive shaft such that loads applied to a cage in an axial direction from the balls are balanced.

Bent-axis hydraulic pump motor

A center shaft of a bent axis type axial piston pump/motor includes an outer race, which is attached to a shaft attachment hole of a cylinder block, has a shaft portion accommodation hole at one end and has a spring accommodation hole at the other end, and an inner shaft, which includes a shaft supporting spherical head portion having a large outer shape dimension at a distal end of a shaft base portion and attached to the shaft portion accommodation hole of the outer race through the shaft base portion.

Bent axis type axial piston pump/motor

In a direct drive type hydraulic pump, the displacement of the hydraulic pump is forcedly changed to a desired displacement according to an instruction of a channel different from a usual instruction, thereby changing to a desired displacement quickly with good responsivity. When an emergency brake switch is turned on, an emergency brake signal is entered an emergency brake control valve. Thus, an emergency brake signal pressure is entered a piston through an emergency brake signal oil passage, and a piston is forcedly positioned in a neutral position. In other words, the piston can be forcedly positioned in the neutral position according to the emergency brake signal regardless of the entry of a usual brake signal. Therefore, the displacement of the hydraulic pump can be forcedly changed to the neutral position (minimum displacement).

Displacement control device for hydraulic pump and brake control device for hydraulic motor

Travel drive apparatus for hydraulic drive work vehicles and control therefor

A travel drive apparatus for a hydraulic drive work vehicle and control method therefor, the apparatus including: a travel hydraulic pump driven by the power of an engine; a hydraulic motor that receives discharged oil from the travel hydraulic pump and causes the vehicle to travel; a travel changeover valve that receives the discharged oil from the travel hydraulic pump, supplies the discharged oil to the hydraulic motor and discharges return oil from the hydraulic motor to a tank, in which the travel drive apparatus comprises; an accelerator for controlling an engine rotational speed; an operation unit for selecting vehicle forward travel, stop, and reverse travel; the travel changeover valve being adapted for receiving signals from the operation unit, switching the discharge oil supplied from the travel hydraulic pump to the hydraulic motor, and controlling vehicle forward travel, stop and reverse travel; a relief valve that regulates pressure for controlling the hydraulic motor when the vehicle has decelerated, positioned between the travel changeover valve and the hydraulic motor; and a pressurizing unit for raising the set pressure at the relief valve controlling the hydraulic motor when the engine rotational speed is increased, while switching the vehicle from forward travel to reverse travel, or from reverse travel to forward travel, so that the work vehicle may switch over from forward to reverse travel; or vice versa, while exhibiting good acceleration performance.

Travel drive apparatus for hydraulic drive work vehicle and control method therefor

Backpressure control circuit for hydraulic drive device

Counter balance valve

A damper for a hydraulic pilot valve having a valve body in which a plurality of pressure reducing valves, a rotational shaft, an operation member attached to the rotational shaft and a handling member rotating the rotational shaft are provided. The pressure reducing valves are operated through the operation member by rotating the rotational shaft by the handling member, and the damper is disposed in the valve body and is adapted to apply an operational resistance to the operation member due to a viscous resistance of a fluid having high viscosity.

Damper of hydraulic pilot valve

Hydraulic circuit for hydraulically driven working vehicle

Driving device for a hydraulic motor

Capacity control device for a hydraulic motor for a hydraulically driven

Hydraulic braking apparatus having two safety valves

A damper for a hydraulic pilot valve having a valve body in which a plurality of pressure reducing valves, a rotational shaft, an operation member attached to the rotational shaft and a handling member rotating the rotational shaft are provided. The pressure reducing valves are operated through the operation member, by rotating the rotational shaft by the handling member, and the damper is disposed in the valve body and is adapted to apply an operational resistance to the operation member due to a viscous resistance of a fluid having high viscosity.

Swash plate angle changing apparatus for a piston pump/motor of swash

Electrical lever assembly

Growing community of inventors

Oyama, Japan

Seita Hayashi