Komatsu Corporation

Kabushiki Kaisha Komatsu Seisakusho

Kenzo Kimoto

Masatake Tamaru

Masami Naruse

Tetsuyuki Hirano

Kunihiko Imanishi

Minpei Shoda

Kazuo Otsuka

Takashi Kawakami

Jun Maruyama

Sadao Nunotani

Kazutoshi Hori

Hiroaki Watanabe

Hidehiko Kobayashi

Koji Ohigashi

Tatsuya Futami

Kenji Kanemaru

Kou Nagaoka

Masakazu Yanagisawa

A hydraulic fluid tank includes a tank main member of a box-shaped member with a return port and a drawing port that are opened therein; and a divider member that is located in an interior of the tank main member and defines a path of fluid flow from the return port to the drawing port. In addition, the divider member is formed so that the fluid flow makes at least one turn in a vertical direction and at least one turn in a width direction.

Hydraulic fluid tank

In construction machinery, control is conducted to keep a work machine to operate at a constant speed regardless of the operation thereof. Different engine output lines T-Tand pump torque lines M-Mare defined for different operation types. All the matching points of the engine output lines T-Tand pump torque lines M-Mdesignate a constant engine speed N. One engine output line and one pump torque line are selected according to the operation type presently selected. An output horsepower of the engine is controlled on an equal horsepower line corresponding to a sum of a horsepower for an auxiliary machine and a horsepower at a matching point of the selected lines. The pump torque for the work machine is controlled on the selected pump torque line. The engine operates at a constant speed Neven when the operation type varies or the horsepower for the auxiliary machine changes.

Device and method of controlling hydraulic drive of construction machinery

Hybrid construction equipment leveling an engine load and effectively performing regeneration of energy is provided. For this purpose, the construction equipment includes a hydraulic pump ( ) and a first electric motor ( ) driven by an engine ( ), a battery ( ) for charging electric power generated by the first electric motor, a second electric motor ( ) driven by electric power of the battery and functioning as a generator at a time of braking revolution, a swash plate angel sensor and a pressure sensor for the hydraulic pump, and a controller ( ) for controlling the first electric motor as a generator by surplus torque when absorption torque is smaller than predetermined output torque of the engine and controlling the first electric motor as a motor to generate an amount of shortage of torque when the absorption torque is larger than the predetermined torque.

Hybrid construction equipment

A hybrid construction equipment capable of sufficiently exhibiting performance of a battery with strategic arrangement of the apparatuses being carried out is provided. For this purpose, the hybrid construction equipment includes, on an upper revolving superstructure ( ) rotatably placed on a lower traveling unit, an engine ( ), a generator ( ) driven by the engine ( ), a battery ( ) charged with electric power generated by the generator ( ), an electric motor ( ) driven by electric power of the battery ( ), an inverter ( ) for controlling drive of the electric motor ( ) and a driver's cab ( ), and the battery ( ) is placed to be isolated from the engine ( ) and the generator ( ).

A hydraulic shovel is provided which comprises a pair of left and right running/rotation pedals ( L and R) for running or rotating a vehicle, and a single running/rotation lever which is installed separately from the pedals for similarly running or rotating the vehicle. The shovel allows the operator to run or rotate the vehicle by operating on the running/rotation pedals L and R, as well as by manipulating the running/rotation lever Moreover, because the running/rotation lever consists of a single lever, the operator can easily manipulate it by one hand, being relieved of complicated operations and inconveniencies encountered with the conventional machine, which ensures the improved operability.

Hydraulic shovel

A hydraulic pipe arrangement of a working machine is not in contact with an obstacle and no torsion and no bending are generated. Accordingly, in a hydraulically driven type working machine provided with a boom ( ) having a vertical swing supporting point supported at a base end side by a machine frame and a joint connection supporting point in a front end side, an arm ( ) connected in a base end side to the joint connection supporting point, a boom driving hydraulic cylinder ( a) hoisting around a hoist supporting point provided in the machine frame so as to drive the boom, an arm driving hydraulic cylinder ( ), and a working tool driving hydraulic cylinder ( ), a swivel joint mechanism relaying a hydraulic pipe arrangement from a side of the machine frame is provided at a center of at least one of the vertical swing supporting point, the joint connection supporting point and the boom driving hydraulic cylinder hoist supporting point.

Hydraulically driven type working machine

A rubber crawler belt having a pattern of a lug provided on an outer circumferential side of a rubber belt has a central lug portion provided to continuously extend around a center portion in a width direction of the outer circumference of the rubber belt, in a waveform, and a plurality of branch lug portions each having a predetermined width and provided from the central lug portion toward left and right end portions of the rubber belt to be away therefrom diagonally in a circumferential direction, and an interval between the branched lug portions adjacent to each other being the same as an interval between drive protrusions, in the circumferential direction of the rubber belt.

Rubber crawler belt

Operator cabin of power shovel

Operator's seat for construction machinery

Power shovel

Control device for a variable displacement hydraulic pump

Workload detecting system for excavating and loading apparatus

An apparatus for detecting an amount of metal powder in a hydraulic circuit for supplying a drain pressurized oil from a hydraulic pump driven by an engine is characterized by comprising a metal powder amount detection sensor (9) disposed in a flow passage of the pressurized oil and adapted to transmit a signal in proportion to an adhering amount of the metal powder and a controller (11) for calculating the metal powder amount from the signal outputted from the metal powder detection sensor and displaying the calculated amount.

Apparatus for detecting metal powder amount in hydraulic circuit

A twin-scrape dozer, capable of maintaining a satisfactory balance during earth loading, of loading a larger quantity of earth, of efficiently conveying earth even over a soft ground, and of adjusting the rate at which earth is scattered, has a crawler type tractor (1, 1A) equipped with a traveling mechanism, a front earth loading and ejecting device (10, 50), and a rear earth loading and ejecting device (30, 70). The traveling mechanism has track frames (2, 2A) at right and left sides of the vehicle (1, 1A), track shoes (5, 5A) and drive units (6, 6A). The earth loading and ejecting devices are provided at the front and rear parts of the vehicle (1, 1A), and are installed to be vertically movable with lift cylinders (13, 33, 56, 78). Each of the earth loading and ejecting devices is provided with a scraper (21, 34, 53, 75) and a bowl member (14, 41, 61, 81) pivotably connected together by pivot pins (22, 42, 62, 83). Each scraper (21, 34, 53, 75) and bowl member (14, 41, 61, 81) are controlled by a bowl cylinder (23, 43, 63, 84), so that the bottom of the bowls (20, 40, 60, 80) can be opened and closed by extending and retracting the respective bowl cylinders (23, 43, 63, 84). The excavating angle of the scrapers (21, 34, 53, 72) can be changed by extending and retracting the tilt cylinders (16, 36) or by adjusting the length of variable length braces (57, 73).

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Hirakata, Japan

Kenzo Kimoto