Komatsu Corporation

Mitsuo Yabe

Tomoya Watanabe

Masahiro Ikeda

Teruyuki Matsuki

Seiichi Fuchita

Yasuhiro Kusuyama

Atsushi Kawano

Hiroki Shinoda

Toshiya Shintani

Akihiro Ohsawa

Yoshiaki Yoshida

Yosuke Yamagoe

Hiroyuki Kitaoka

Masahiro Tazou

Takashi Kawakami

Toshihiko Nishiyama

Hiroaki Inoue

Noboru Kanayama

Satoru Nishimura

Kuniaki Nakada

Kazuya Imamura

Kengo Koshimizu

Teruyuki Hosoya

A wheel loader is provided with an engine, an engine compartment, a top plate, an injection device, and a duct member. The engine compartment houses the engine. The top plate has a first opening section. The top plate defines the upper surface of the engine compartment. The injection device is disposed inside the engine compartment. The duct member is disposed above the injection device. The duct member is disposed below the first opening section.

Work vehicle

A wheel loader is provided with an engine compartment, a urea water injection device, a second side plate, a guiding member, and a suction part. The second side plate has a first outdoor air intake port. The guiding member is configured to guide outdoor air sucked in through the first outdoor air intake port onto the urea water injection device. The suction part sucks air into the engine compartment. The urea water injection device is disposed within an air flow produced between the suction part and the guiding member.

A wheel loader is provided with an engine compartment, a cooling compartment, a radiator, a cooling fan, a partition wall, a first duct body part, and a top plate. A first end part of the first duct body part is positioned inside the engine compartment. A second end part of the first duct body part is positioned inside the cooling compartment in front of the radiator and the cooling fan. A first outdoor air intake port formed in the top plate is formed in front of the radiator and the cooling fan.

A cooling device includes: a cooling fan; a shroud provided at an outer circumferential side of the cooling fan; and a ring having an inner circumferential wall and an outer circumferential wall. The inner circumferential wall is provided on the shroud and adjacent to an outer circumference of the cooling fan. The outer circumferential wall surrounds the inner circumferential wall, and an air-flow-direction downstream side end of the outer circumferential wall is positioned at a further downstream position in an air flow direction than an air-flow-direction downstream side end of the inner circumferential wall. An air-flow-direction downstream side end of an outer circumferential edge of the cooling fan is positioned at a further downstream position in the air flow direction than the air-flow-direction downstream side end of the inner circumferential wall.

Cooling device and construction machine or working machine equipped with the same

A cooling device includes: a cooling fan; a shroud provided at an outer circumferential side of the cooling fan; an inner circumferential wall provided on the shroud and adjacent to the outer circumference of the cooling fan so as to surround the cooling fan; an outer circumferential wall provided to surround the inner circumferential wall. An air-flow-direction downstream side end of the outer circumferential wall is positioned at a further downstream position in an air flow direction than an air-flow-direction downstream side end of the inner circumferential wall. The cooling fan is rotatable within a space provided on a radially inner side of the inner circumferential wall. The air-flow-direction downstream side end of the outer circumferential wall is provided at a further upstream position in the air flow direction than an air-flow-direction downstream side end of the cooling fan.

A cooling device includes: a cooling fan; a shroud provided at an outer circumferential side of the cooling fan; an inner circumferential wall provided on the shroud and adjacent to the outer circumference of the cooling fan; and an outer circumferential wall provided to surround the inner circumferential wall. An air-flow-direction downstream side end of the outer circumferential wall is positioned at a further downstream position in an air flow direction than an air-flow-direction downstream side end of the inner circumferential wall. An air-flow-direction downstream side end of the cooling fan is positioned at a further downstream position than the air-flow-direction downstream side end of the inner circumferential wall. A ratio between a length of the outer circumferential wall and a length of the inner circumferential wall in the air flow direction is 1.07 or more and 1.81 or less, and a width between the outer circumferential wall and the inner circumferential wall is 15 mm or more and 55 mm or less.

A cooling device includes: a cooling fan; a shroud provided at an outer circumferential side of the cooling fan; an inner circumferential wall provided on the shroud and adjacent to the outer circumference of the cooling fan; and an outer circumferential wall provided to surround the inner circumferential wall. An air-flow-direction downstream side end of an outer circumferential edge of the cooling fan is positioned at a further downstream position in an air flow direction than an air-flow-direction downstream side end of the inner circumferential wall. An angle between: an line connecting the air-flow-direction downstream side end of the inner circumferential wall to the air-flow-direction downstream side end of the outer circumferential wall in cross section along the air flow direction of the inner circumferential wall and the outer circumferential wall; and a line orthogonal to the air flow direction, is 9 degrees or more and 45 degrees or less.

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

Fan shroud for construction machinery

An engine cooling air passage for construction equipment, which is capable of reducing noise released from a cooling air exhaust port with back pressure of cooling air remaining low and making an engine room compact, is provided. To this end, in the engine cooling passage, a fan air diversion passage ( ) of a predetermined length, which has a fan air diversion opening ( ) located near an outer periphery portion of a cooling fan ( ) and taking in a cooling air blown by the cooling fan ( ), at one end side, and an opening ( ) located near a lateral end portion of a counterweight ( ) and discharging the cooling air taken in to an outside, at the other end side, is formed either in a front portion of or in front of the counterweight ( ).

Engine cooling air passage for construction equipment

Porous damping material ( ) is attached to an entire inner circumference of the fan shroud ( ) opposing to an end of a fan ( ) and is exposed to opposing space without using conventional perforated metal. Accordingly, jet noise caused by strong swirl between the fan ( ) and the fan shroud ( ) can be damped by the damping material ( ) and impulsive sound scarcely occurs. Thus, both of the impulsive sound and the jet noise can be effectively damped, thereby securely reducing noise. The pours member ( ) constituting the porous damping material ( ) is a die-molding product made by a die ( ) having a cavity ( ).

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Hiratsuka, Japan

Mitsuo Yabe