Komatsu Corporation

Kabushiki Kaisha Komatsu Seisakusho

Kazuya Imamura

Kuniaki Nakada

Masahiro Ikeda

Kikuo Ejima

Kenji Nishikawa

Taizou Nakagawa

Kazuhisa Suzuki

Tairo Samejima

Yoshitaka Nishihara

Hirohide Sato

Hiroyasu Suda

Shigeki Honda

Mitsuo Yabe

Noboru Kanayama

Tomoya Watanabe

Tatsunori Suwa

Teruyuki Hosoya

Shigeki Iwasaki

Takaaki Mizokami

Naoya Ando

Naotsuna Matsuda

A work machine includes: a partition member provided with an intake port and an exhaust port and forming an engine room; an engine disposed in the engine room; a cooling fan disposed on an intake port side of the engine in the engine room; an exhaust pipe discharging exhaust gas from the engine; and an exhaust duct disposed in the engine room and having an inflow port into which air from the cooling fan flows, and an outflow port. At least a portion of the exhaust duct is disposed above the engine and has a facing surface facing the engine and a through-hole provided in the facing surface. At least a portion of the exhaust pipe is disposed in the through-hole. A gap is formed between an outer surface of the exhaust pipe and an inner surface of the through-hole.

Work machine

A work machine includes a first cooling unit that protrudes from a first wall surface at a first position of a main flow path and defines a first opening portion between the second wall surface and the first cooling unit; a second cooling unit that protrudes from the second wall surface on a downstream side of the first position in the flow path direction of the main flow path, defines a second opening portion between the first wall surface and the second cooling unit and partly overlaps with the first cooling unit when viewed from the flow path direction; and partition member that defines a first section flow path having the first cooling unit as an inlet and the second opening portion as an outlet and a second section flow path having the first opening portion as an inlet and the second cooling unit as an outlet.

A bucket for a construction machine including a side plate (); a bottom plate (), at least a portion of which is connected to the side plate (); and a laminated plate () that is attached to an outside of the side plate (). At least a part () of the portion where the side plate () and the bottom plate () are connected on an inside of the side plate () and the bottom plate () is reinforced.

Vibration damping device and bucket for construction machine

A pressure-receiving face plateis mounted on one end face of a piston, and a support memberis raised on the end face of the piston. Disposed on the support memberwith an allowance are, from the pressure-receiving faceplaterespectively, a disk spring, a plate, and a plunger. A flangeprevents these members from slipping off the support member. When the pistonapproaches a stroke end, the plungeris inserted in an oil passageand applies a cushioning effect to the piston. In addition, a gap between the pressure-receiving faceplateand the platebrought into contact with a cylinder bottombecomes narrow, and produces a squeeze effect such that oil escapes from the narrow gap. This makes it possible to provide a hydraulic cylinder that produces a sufficient impact force at the stroke end of the piston and also reduces noise emitted by the impact force, without increasing a length of the hydraulic cylinder.

Hydraulic cylinder

A vibration damping device capable of maintaining high vibration damping effect, and a bucket for a construction machine. The vibration damping device has a laminated plate () having at least its inner region fixed in a noise-emitting base material (), the inner region being a region (G) other then a region which becomes a loop in a vibration mode when the base material () is vibrated in a vibration mode with a predetermined frequency.

An engine noise reduction device to reduce sound output from an engine compartment and supply cooling air to the engine compartment to increase cooling efficiency and prevent engine and component overheating. The device opposes a plurality of air inlets, to receive an air flow therefrom, and includes a split-type noise absorbing portion and a cell-type noise absorbing portion.

Noise absorbing device and device for taking air into engine room of a construction machine

Breakthrough buffer for presses and control method therefor

A press machine having side frames which are effectively reinforced so as to appreciably reduce the noise generated during operation of the machine and improve the working accuracy of the machine without installing any special device on the outside thereof, significantly increasing the weight of the entire press machine, or obstructing a space between the side frames of the press machine. The side frames of the press machine are C-shaped in side view and are reinforced by at least one reinforcing member fixedly secured to each of the side frames at at least one predetermined place. The reinforcing members function to suppress the deformation of the opening of the C-shaped side frames to reduce noise and improve accuracy. The reinforcing members convert the vibrational energy of the side frames into heat energy which is then absorbed into the side frames.

Press machine having reinforced side frames

A press machine having side frames which are effectively reinforced so as to appreciably reduce the noise generated during operation of the machine and improve the working accuracy of the machine without installing any special device on the outside thereof or significantly increasing the weight of the entire press machine. The side frames of the press machine which are C-shaped in side view, are reinforced by at least one reinforcing member fixedly secured to each of the side frames at at least one predetermined place. The reinforcing members function to suppress the deformation of the opening of the C-shaped side frames to reduce noise and improve accuracy.

Growing community of inventors

Kanagawa, Japan

Kazuya Imamura