Komatsu Corporation

Kabushiki Kaisha Komatsu Seisakusho

Hiroshi Nakagami

Taira Ozaki

Hironori Yamamitsu

Shigeru Yamamoto

Shigenori Matsushita

Kazuki Kure

Kanji Namimatsu

Hiroshi Ohta

Kenji Matsubara

Akihito Ounishi

Tomohiro Nakagawa

Ryoichi Maruyama

Tsutomu Ishino

Satoru Shintani

Takashi Katou

Tomoaki Tsuji

Hironori Toda

Hisao Asada

Singo Ota

Yoshihisa Fujimoto

Shuta Matsumura

Akhito Ounishi

An exhaust gas treatment unit includes an exhaust gas treatment device, a bracket and a connecting pipe. The exhaust gas treatment device is mounted on a bracket. The connecting pipe is connected to the exhaust gas treatment device. The connecting pipe directs exhaust gas to the exhaust gas treatment device. The connecting pipe may include a supporting portion and a pipe portion, with the supporting portion supporting the bracket and the pipe portion being integrated with the supporting portion. Alternatively, the exhaust gas treatment unit may further include a supporting member having a supporting portion supporting the bracket and a pipe portion integrated with the supporting portion, with the pipe portion connected to the connecting pipe.

Exhaust gas treatment unit

An engine unit includes an engine, an exhaust gas treatment device and a connecting pipe. The engine has an exhaust gas port. The exhaust gas treatment device is arranged above the engine. The connecting pipe connects the exhaust gas port and the exhaust gas treatment device. The connecting pipe has an expandable-contractible bellows portion. The bellows portion has a linear form following the upward-downward direction. The lower end portion of the bellows portion is positioned lower than at least a part of the exhaust gas port.

Engine unit

An exhaust treatment unit for a work vehicle includes a selective catalytic reduction apparatus, a connection pipe, an ejection apparatus attached to the connection pipe, a first pipe section that guides coolant to the ejection apparatus, a second pipe section that discharges coolant from the ejection apparatus, first and second retaining sections, and a coolant pump. The ejection apparatus ejects reducing agent into exhaust supplied to the selective catalytic reduction apparatus. The first and second retaining sections retain coolant and are connected to the first and second pipe sections above the ejection apparatus, respectively. The coolant pump is driven by an engine driving force and supplies the coolant to the ejection apparatus via the first pipe section. The first and second pipe sections extend upward from first and second connecting sections of the first and second pipe sections and the ejection apparatus toward the first and second retaining sections, respectively.

Exhaust treatment unit and work vehicle having exhaust treatment unit

A bulldozer includes a cab and an engine hood. The cab has a foremost surface, and left and right front surfaces. The engine hood has an upper surface, left and right side surfaces, and flat first, second and third inclined surfaces. The first and second inclined surfaces contact the rear side of the upper surface and rear sides of the left and right side surfaces, and are inclined more obliquely to the right rear and left rear than the left and right side surfaces, respectively. The first, second and third inclined surfaces are inclined to face downward to the rear. The third inclined surface contacts the first and second inclined surfaces, and the upper surface. A window attached to the foremost surface is arranged in a vertical direction above first and second sides closest to the foremost surface out of sides constituting the first and second inclined surfaces, respectively.

Bulldozer

A bulldozer includes a cab, a fuel tank arranged to a rear of the cab, and first and second engaging members. The cab includes a driver seat and an air-conditioning cooling module projecting rearward from an upper end portion of the cab. The first and second engaging members are provided on the fuel tank, with each having an engaging part to engage onto a suspension member. The engaging part of the first engaging member is positioned on a first lateral side of a first straight line connecting a first lateral side end of the air-conditioning cooling module and a first lateral side end of the fuel tank. The engaging part of the second engaging member is positioned on a second lateral side of a second straight line connecting a second lateral side end of the air-conditioning cooling module, and a second lateral side end of the fuel tank.

A radiator grill is mounted on a work vehicle and includes a frame and a plate member. The plate member is supported by the frame and having a plurality of through-holes aligned in a first direction and a second direction orthogonal to the first direction. Each of the through-holes has a pair of circular parts aligned in the first direction, and an interconnecting part having a width in the second direction that is smaller than diameters of the circular parts, the interconnecting part interconnecting the circular parts. The through-holes are disposed alternately so that one of the circular parts of one of two adjacent ones of the through-holes adjacent to each other in the second direction is aligned with the interconnecting part of the other of the two adjacent ones of the through-holes in the second direction.

Radiator grill

In the engine compartment of a bulldozer the radiator is arranged forward of the engine. An exhaust gas treatment unit is arranged above the engine. A first exhaust gas treatment device of the exhaust gas treatment unit is arranged such that the longitudinal direction of the first exhaust gas treatment device follows the forward-backward direction of the vehicle. A second exhaust gas treatment device of the exhaust gas treatment unit is positioned to the side of the first exhaust gas treatment device, and arranged such that the longitudinal direction of the first exhaust gas treatment device follows the forward-backward direction of the vehicle. The air cleaner is arranged between the radiator and the exhaust gas treatment unit in the forward-backward direction of the vehicle.

A bulldozer includes an engine, first and second exhaust treatment apparatuses arranged above the engine, a relay connection pipe connecting the first and second apparatuses, and an engine hood covering upper parts of the first and second apparatuses. The relay connection pipe has a cylindrical shaped main section, a first section connecting the main section and the first apparatus, and a second section connecting the main section and the second apparatus. The lower end of the main section is positioned above upper ends of the first and second apparatuses. The upper surface of the hood has a convex section protruding above the relay connection pipe and a base section formed integrally with the convex section below the convex section. At least a portion of a line segment extending along the upper edge of the main section overlaps an upper surface part of the convex section in a bulldozer top view.

A bulldozer includes an engine, first and second exhaust treatment apparatuses, and an engine hood. The first and second apparatuses are arranged above the engine. The hood covers upper parts of the first and second apparatuses. Longitudinal directions of the first and second apparatuses extend along the vehicle front and back direction. The hood has an upper surface, left and right side surfaces, and first and second inclined surfaces. The first and second inclined surfaces contact the rear side of the upper surface and rear sides of the left and right side surfaces, respectively. The first and second inclined surfaces are inclined more obliquely to the right and left rear than the left and right side surfaces, respectively, and face downward to the rear. Front edges of the first and second inclined surfaces are positioned in front of rear edges of the first and second apparatuses.

A controller of a work vehicle sets the upper limit of a fan target rotational speed in accordance with an engine rotational speed. The controller reduces an upper limit of the fan target rotational speed further when a lock-up clutch is in an engaged state than when the lock-up clutch is in a released state.

Work vehicle and method for controlling work vehicle

In a work vehicle, an engine compartment is disposed forwards of a cab. An exhaust gas treatment device is disposed over an engine in the engine compartment. A radiator is disposed forwards of the exhaust gas treatment device (33) in the engine compartment. A blower is configured to generate an airflow passing through the radiator from back to front of the radiator. The exhaust gas treatment device is slanted with respect to a vehicle width direction for increasing a distance between the exhaust gas treatment device and the radiator towards a first lateral face portion. Further, the first lateral face portion includes air inlets facing a space between the exhaust gas treatment device and the radiator.

Work vehicle with engine compartment and exhaust gas treatment arrangement

A ground leveling control system for a bulldozer, comprising: (a) a cutting edge position detector for detecting a position of a cutting edge of a blade with respect to the ground; and (b) a blade controller for controlling the blade to be lifted or lowered such that the cutting edge position of the blade detected by the cutting edge position detector is kept coincident with a preset target cutting edge position.

Ground leveling control system for a bulldozer

A running slip control system for a bulldozer, comprising: (a) a running slip detector for detecting the running slip of a vehicle body; and (b) a blade controller for lifting a blade to eliminate the running slip when the running slip detector detects the occurrence of running slip.

Running slip control system for a bulldozer

A blade control system for a bulldozer, comprising: (a) a pitch angle detector for detecting a pitch angle of a vehicle body when the vehicle body inclines back and forth; (b) an actual tractive force detector for detecting an actual tractive force of the vehicle body; and (c) a controller for correcting the actual tractive force detected by the actual tractive force detector according to the pitch angle detected by the pitch angle detector and for controlling the blade to be lifted or lowered such that the corrected actual tractive force becomes equal to a target tractive force.

Growing community of inventors

Hirakata, Japan

Hiroshi Nakagami