Komatsu Corporation

Nichias Corporation

Tadashi Mori

Takahiro Niwa

Manabu Himoto

Osamu Nishimura

Motonori Kondoh

Hiroyuki Shioji

Jin Yogita

Masaki Yoshihara

Koudou Tsuji

Kenji Sanada

Masanori Sogo

Kaname Arimizu

Hiroshi Yamashita

Michihiro Inagaki

Tatsushi Itou

Kazuyoshi Morimoto

Akinao Hiraoka

Kiichirou Kouno

Ryo Kondo

A work vehicle includes a valve for switching between a merging position for causing a first oil passage for driving a bucket and a second oil passage for driving an arm to communicate with each other, and a diverging position for separating the first oil passage and the second oil passage. The work vehicle is adapted to switch the valve from the merging position to the diverging position, when one of a pump pressure in the first pump and a pump pressure in the second pump comes to be equal to a predetermined value during an excavation operation. The work vehicle is adapted to control both pumps, such that the amount of the oil discharged from the first pump is larger than the amount of the oil discharged from the second pump, when the pump pressure in the first pump is equal to or more than the predetermined value.

Work vehicle and hydraulic control method

A sound proof material here disclosed comprises an exterior material layerincluding a holding materialmade of a woven fabric and a skin materialmade of a thermoplastic resin film, and a sound absorbing material layer, the exterior material layerbeing laminated on the sound absorbing material layerso that the skin materialis located on the surface side of the sound proof material, whereby the sound proof material can endure long-time use without deterioration in moldability under inhibition of aging in severe operating environments so that the sound proof material can be suitably used while suppressing sound from a sound source around an engine installed in an engine compartment of an automobile.

Sound proof material and method for manufacturing the sound proof cover

A hydraulic excavator includes an engine, a revolving frame supporting the engine, a vehicle body frame, a first exhaust treatment apparatus and a connecting pipe. The vehicle body frame includes a plurality of column members disposed upright on the revolving frame. The first exhaust treatment apparatus is supported by the vehicle body frame and treats exhaust from the engine. The connecting pipe connects the engine and the first exhaust treatment apparatus. At least a portion of the connecting pipe includes an extendable and contractable bellows portion. The connecting pipe includes a fixing portion fixed to the vehicle body frame. The fixing portion is positioned in the connecting pipe between the bellows portion and the first exhaust treatment apparatus.

Hydraulic excavator

A work vehicle includes an engine, an exhaust gas purification apparatus, a reducing agent tank, an engine coolant circuit, a branch path, a valve, an accepting portion, and a valve control unit. The exhaust gas purification apparatus purifies a nitrogen oxide in an exhaust gas. The reducing agent tank stores a reducing agent to be supplied to the exhaust gas purification apparatus. The engine coolant circuit includes a water pump for circulating a engine coolant through a circulation path as the engine is driven. The branch path is provided for heat exchange between the engine coolant and the reducing agent in the reducing agent tank. The valve controls supply of the engine coolant into the branch path. The accepting portion accepts an operation instruction from an operator. The valve control unit gives an instruction for an opening operation of the valve in response to the operation instruction from the operator.

Work vehicle

A work vehicle includes an engine, an injector injecting a reducing agent to an exhaust gas exhausted from the engine, a determination portion determining whether or not a temperature of the injector is high, a stop determination portion determining whether or not the engine has stopped while the injector is in a high-temperature state as a result of determination by the determination portion, a counter counting the number of times of stop of the engine while the injector is in the high-temperature state based on a result of determination by the stop determination portion, and a warning portion giving a warning in connection with stop of the engine when a count value of the counter exceeds a first prescribed value.

A hydraulic excavator includes an engine, a rotating frame, a vehicle body frame, a diesel particulate filtering device, a selective catalytic reduction device, and a connecting pipe. The diesel particulate filtering device and the selective catalytic reduction device are supported by a vehicle body frame. At least a portion of the connecting pipe includes an extendable bellows part. The connecting pipe connects the engine and the diesel particulate filtering device. The diesel particulate filtering device is located further away from the engine than the selective catalytic reduction device along a first direction on a horizontal plane. The first tubular body portion of the diesel particulate filtering device and the second tubular body portion of the selective catalytic reduction device are disposed apart from each other with a space therebetween in a plan view.

A hydraulic excavator includes an engine, a revolving frame supporting the engine, a vehicle body frame, a diesel particulate filter device, and a first connecting pipe. The vehicle body frame is disposed on the revolving frame. The diesel particulate filter device and the selective catalytic reduction device are supported by the vehicle body frame. The first connecting pipe connects the engine and the diesel particulate filter device. The first connecting pipe includes a bellows part that is extendable in at least a portion thereof. The diesel particulate filter device is located further away from the engine than the selective catalytic reduction device. The first connecting pipe passes below the selective catalytic reduction device and is connected to the diesel particulate filter device. A connecting portion for the diesel particulate filter device and the first connecting pipe is located below the diesel particulate filter device.

The present invention relates to a sound-proof material containing a first sound-absorbing material disposed facing a sound source, a first soft sound-insulating layer laminated on a face of the first sound-absorbing material opposite to the sound source and having an air permeability measured in accordance with JIS L1018 of 10 cc/cm&#xb7;sec or lower, a second sound-absorbing material laminated on the first soft sound-insulating layer, and a second soft sound-insulating layer laminated on the second sound-absorbing material and having an air permeability measured in accordance with JIS L1018 of 10 cc/cm&#xb7;sec or lower and a Young's modulus measured in accordance with JIS K7127 greater than or equal to five times that of the first soft sound-insulating layer, in which at least the second soft sound-insulating layer is partially or entirely bonded to the second sound-absorbing material.

Sound-proof material and process for production thereof, sound-proof molding, and sound insulation method

A work vehicle includes an engine, an idling stop execution portion, a determination portion, a counting portion, and an idling stop time period adjustment portion. The engine can rotate in a first idling state and a second idling state in which the engine rotates at the number of rotations higher than a prescribed number of rotations. The idling stop execution portion performs an idling stop operation for stopping the engine. The determination portion determines whether or not stop has been made from the second idling state. The counting portion counts the number of times of stop of the engine from the second idling state. An idling stop time period adjustment portion makes a prescribed time period of the second idling state longer than a current time period, when the number of times of stop of the engine is equal to or greater than the prescribed number of times.

An exhaust treatment unit treats exhaust gas from an engine of a work vehicle. The exhaust treatment unit includes a diesel particulate filter device, a selective catalytic reduction device, a first support component and a second support component. The diesel particulate filter device treats the exhaust gas. The selective catalytic reduction device treats the exhaust gas. The first support component supports the diesel particulate filter device. The second support component supports the selective catalytic reduction device and the first support component. The first support component is detachable from the second support component.

Exhaust treatment unit

The present invention relates to a soundproof cover containing: a sound-absorbing material disposed facing to a sound source; a soft sound-insulating layer laminated on the sound-absorbing material and having an air permeability measured according to JIS L 1018 (1999) of 10 cc/cm&#xb7;sec or less; and a soft cover forming an air layer with the soft sound-insulating layer and having a Young's modulus measured according to JIS K 7127 (1999) of 0.2 to 1.5 GPa, in which the air layer is hermetically sealed.

Soundproof cover and method for producing the same

The present invention provides a soundproof cover comprising: a sound-absorbing material having air permeability; and a skin material impregnated with a viscoelastic material and having air permeability, wherein the skin material is provided on a surface of the sound-absorbing material opposite to a sound source, and wherein the soundproof cover has a three-dimensional shape corresponding to an outer shape of the sound source.

Soundproof cover

The present invention relates to a soundproof cover for automobiles, the soundproof cover including: a cover body formed of a metal or a resin; and a sound-absorbing material disposed opposite to a sound source, in which the sound-absorbing material has a soft sound-insulating layer on a surface side thereof facing the cover body, the sound-absorbing material is disposed apart from the cover body, and the sound-absorbing material has a peripheral edge that contacts with an inner wall of an edge of the cover body.

Soundproof cover for automobiles

A cab for a construction machine is provided which is capable of providing a protective space to protect the operator from injury even if a transversely working external force is imposed on the cab, causing deformation of the cab. To this end, a transverse member, which is disposed at a position above an operator's seat and constitutes the framework of the cab, has a deformation inducing part located at a position outside the projected area of the central part of the operator's seat. Even if the cab is deformed by an external force, the cab is not largely deformed in a direction toward the operator.

Cab for construction machine

A cab for a construction machine is provided which is cost effective, good in strength as a cab, usable in narrow sites where an obstacle exists, and good in front visibility and design. The cab for a construction machine has left front, left rear, right front and right rear pillarswhich vertically extend. The left rear and right rear pillarsare made of a pipe material, and the rear part of the cab has greater rigidity than the front part of the cab. The left front and right front pillarsare respectively constituted by at least two press-molded parts which are respectively formed into a specified shape by press molding.

Growing community of inventors

Hirakata, Japan

Tadashi Mori