Hitachi Construction Machinery Co., Ltd.

Hitachi Construction Machinery Tierra Co., Ltd.

Junya Kawamoto

Yasutaka Tsuruga

Takashi Kanai

Hiroshi Tabeta

Yasuhiro Miyahara

Shigehisa Hagura

Tomoyuki Tanaka

Osamu Kokuryo

Osamu Kokuryou

Kazuhiko Hiraoka

Tomoyuki Miyata

Katsuhiro Sasaki

Yasuharu Okazaki

Satoshi Hamamoto

Kenichiro Nakatani

Yukiaki Nagao

Yohei Iwamoto

Kohei Maeda

Keiji Ahiko

Kiwamu Takahashi

Masashi Setaki

Kosuke Moriguchi

Masaya Ueda

Masayuki Yunoue

Yuuki Umizaki

Akira Saito

Kazuyoshi Yamada

Daisuke Yamamoto

Kentaro Kamakura

Tomoaki Ashida

Kenji Itou

Takashi Higuchi

Hitoshi Kimura

Kouhei Maeda

Ryozo Fujikawa

Tetsuya Sumino

Yuki Hashimoto

A controller mounted on a small-sized hydraulic excavator includes an engine restart section that restarts an engine when a horn switch operation determining section determines that a horn switch is operated and a gate lock lever position determining section determines that a gate lock lever is at a lock position in a case where a restart standby time determining section determines that restart standby time does not yet elapse after the engine is automatically stopped by an idling stop function, and a power supply stopping section that stops an electric power supply of a vehicle body when the restart standby time determining section determines that the restart standby time has elapsed.

Construction machine with engine restart section and horn switch and gate lock lever operations

An engine cover () is provided between a counterweight () and a rear surface part (B) of a cab () to be capable of opening/closing in an upper-lower direction and a heat exchanger cover () is provided between the rear side of a left side surface part (C) and a right side surface part (D) of the cab () and a revolving frame (). The heat exchanger cover () is formed of a horizontal-opening structure of being rotatable in a front-rear direction to the revolving frame () with a front end (C) in the front-rear direction as a fulcrum and a rear end (D) in the front-rear direction as a free end. A heat exchanger cover lock mechanism () is provided on the rear end side of the heat exchanger cover () to hold the heat exchanger cover () in a closed state, and in a state where both the heat exchanger cover () and the engine cover () are closed, the engine cover () covers the rear end (D) of the heat exchanger cover () and the heat exchanger cover lock mechanism () from backward.

Small-sized construction machine with heat exchanger cover

A cap holder () that is attached to the inner surface side of a fuel filling door () in a state of facing an inner surface of the fuel filling door () with an interval in order to hold a cap (K) removed from a fuel tank () and a lock () that locks the fuel filling door () from the outside in a state where the fuel filling door () closes a fuel filling opening () are provided on the fuel filling door (). The lock () has a lock lever (C) that rotationally moves between a locking position where the fuel filing door () maintains a state of closing the fuel filling opening () and an unlocking position where the fuel filling door () allows opening of the fuel filling opening (). This lock lever (C) is configured by a long member a base end of which is rotatably attached to the fuel filling door () and a leading end of which is allowed to enter a gap between the fuel filling door () and the cap holder ().

Small-sized construction machine

An upper revolving structure () includes a revolving frame (), an engine (), a fuel tank (), an operator's seat platform () provided by covering an upper side of the fuel tank (), an operator's seat () mounted on the operator's seat platform (), and a cab () covering a periphery of the operator's seat (). The fuel tank () is disposed between the revolving frame () and the operator's seat platform (), brought closer to a left surface part () side of the cab (). A level gauge () is provided on an outer surface of the fuel tank (). A fuel filling opening () surrounding a fuel filling port (J) of the fuel tank () and a level gauge opening () are provided on the left surface part () of the cab ().

A floor-plate side opening part (B) through which each lever part () of a traveling lever pedal () is inserted is provided on a front side of a floor plate (). A mat-side opening part (C) corresponding to the floor-plate side opening part (B) is provided on a floor mat (). A cover member () formed of a flat plate part () covering the mat-side opening part (C) and having a slit (A,B) allowing tilting of each lever part () and a cylindrical part () extending from the flat plate part () is provided on the mat-side opening part (C). An entire-circumferential lip part (D) is provided on the mat-side opening partC. An entire-circumferential stepped part () for sealing a space from the entire-circumferential lip part (D) is provided on the flat plate part (). An entire-circumferential engaging protrusion part (C) is provided on the floor-plate side opening part (B), and an entire-circumferential recessed groove () engaged with the entire-circumferential engaging protrusion part (C) is provided on the cylindrical part ().

A heat exchanging device includes a frame member assembled having a square frame shape by using a lower frame extending in a front and rear direction and mounted on a revolving frame, side frames extending to an upper side from both ends of the lower frame, and an upper frame extending on an upper part of the side frames. A cooling fan is disposed in a state in which each of the blades enters into the frame member from an engine side end surface with respect to the frame member. An oil cooler and a radiator are mounted on a mounting surface plate on an opposite side to the engine and interposing said cooling fan at an interval from the cooling fan with respect to the frame member. A flat plate shaped shroud surrounding each of the blades of the cooling fan and forming a fan accommodating chamber among the frame member, the oil cooler, and the radiator is mounted on the engine side end surface of the frame member.

Construction machine

A floor support frame () is provided with a left side pilot valve (). The left side pilot valve () is provided with a left side operating pedal () that is foot-operated. The left side operating pedal () is configured of a first foot board () that is mounted on the left pilot valve () to be rotatable in an upper-lower direction, a shaft () that is mounted in a rear portion of the first foot board (), and a second foot board () that is mounted through the shaft () on the first foot board () to be rotatable in a horizontal direction. The second foot board () is rotatable between a storage position of overlapping the first foot board () and a use position of being rotated in the rear side of the first foot board (). An operation regulating mechanism () is provided in the front side of the first foot board () to be engaged to the second foot board () when the second foot board () is rotated to the storage position to regulate a foot operation.

Small-sized hydraulic excavator

A compact excavator includes: a swing post which is attached to a upperstructure and which can swing in a left/right direction, a working device which is attached to the swing post and which includes a boom cylinder, a counterweight, and hydraulic hoses which extend upwards between opposite side plates of the swing post, and through which pressure oil for driving the boom cylinder of the working device is guided. The compact excavator further includes a guide plate which is provided in the swing post, and which guides the hydraulic hoses downwards while restricting the hydraulic hoses from moving to approach a handrail when the hydraulic hoses attempt to expand toward the handrail due to driving of the working device.

Construction equipment

Disclosed is a construction machine that enables an operator to operate a vehicle width changing control lever while visually confirming positions of crawlers. The construction machine includes a lower track structurewhose left and right crawler track devicesA andB are adapted to change in spatial interval, and an upper swing structureswingably mounted above the lower track structure. The construction machine further includes a hydraulically actuated cylinder for changing vehicle width, disposed between the left and right crawler track devices, the vehicle width changing cylinder changing the interval between the left and right crawler track devices upon supply and discharge of a hydraulic fluid being controlled by a vehicle width changing control valve, and a vehicle width changing control leverdisposed on a left section of a swing body support structurerelative to an operator's seat, the vehicle width changing control lever operating the vehicle width changing control valve.

A heat exchanging device has a frame member mounted on a revolving frame, and this frame member supports an oil-cooler and a radiator. A support member is to support a canopy and the like. The support member is composed of a housing support base provided by extending in the left-right direction on an upper side of the engine and a left front leg part and a left rear leg part each having an upper end mounted on a left-side position in the left-right direction of the housing support base and a lower end mounted on the revolving frame by straddling an engine. The housing support base of this support member has a right side in the left-right direction formed as a free end. Further, the free end of the housing support base is configured to be mounted on the frame member of the heat exchanging device.

A hydraulic oil tank attachment structure arranged in a construction machine secures the strength of a hydraulic oil tank as well as secures a large capacity thereof. The attachment structure is arranged in a compact excavator provided with a revolving superstructure, a working device attached to the revolving superstructure, a hydraulic actuator including a revolving motor that drives the revolving superstructure and an actuator that drives the working device. A hydraulic oil tank made of synthetic resin, which stores hydraulic oil to be supplied to the hydraulic actuator, is attached on a revolving frame of the revolving superstructure. The hydraulic oil tank attachment structure has a holding member provided with a projecting part formed on a side surface of the tank, which is fixed on the revolving frame of the revolving superstructure so as to surround side surfaces thereof to hold the hydraulic oil tank via the projecting part.

Hydraulic oil tank attachment structure of construction machine

A control valve block is mounted on a bottom plate of a revolving frame through a control valve block mounting plate. In this case, a left support member and a right support member are provided on a back surface of the control valve block mounting plate at two spots with equal distances sandwiching a center position of gravity (G) of the control valve block. The left and right support members are mounted on a support beam provided on the bottom plate of the revolving frame. On the other hand, a weight-reducing part is provided at a part in the bottom plate of the revolving frame away from the support beam. The control valve block which is a heavy article is stably supported on the bottom plate at two spots sandwiching its center position of gravity (G). Moreover, the weight of the revolving frame can be reduced by the weight-reducing part.

Growing community of inventors

Moriyama, Japan

Junya Kawamoto