公开(公告)号：US20210372431A1

公开(公告)日：2021-12-02

申请号：US17284507

申请日：2019-10-10

Applicant: Hitachi Construction Machinery Co., Ltd.

Inventor： Daiwa SATO ,  Kazuya KUSANO ,  Hitoshi NISHIGUCHI ,  Kunihiko IKEDA ,  Kenichi HANO

IPC: F04D29/42 ,  F04D29/28 ,  F04D29/30 ,  F04D29/44

Abstract: A construction machine includes a centrifugal fan, and a bell mouth arranged on the suction side of the centrifugal fan. The centrifugal fan has a rotatable hub, an annular shroud arranged so as to face the hub and having a suction port, and multiple blades provided between the hub and the shroud. An outlet of the bell mouth is arranged on the radially inner side of the suction port of the shroud. Each blade is formed such that: a leading edge has a convex shape protruding toward a suction surface relative to a line segment linking a connection of the leading edge with the hub and a connection of the leading edge with the shroud; and a vertex of the convex shape of the leading edge is positioned on a radially inner side of a wall surface of the outlet of the bell mouth when the suction side of the centrifugal fan is seen in an axis direction.

公开(公告)号：US20170275846A1

公开(公告)日：2017-09-28

申请号：US15506778

申请日：2015-08-31

Applicant: Hitachi Construction Machinery Co., Ltd.

Inventor： Hitoshi NISHIGUCHI ,  Toshihiro ABE ,  Tetsuya MATSUMOTO

IPC: E02F3/32 ,  B60K11/04 ,  F01P11/04 ,  F01P3/20 ,  F01P1/06 ,  F01P5/02 ,  E02F9/08 ,  B60K11/08

CPC classification number: E02F3/32 ,  B60K11/04 ,  B60K11/08 ,  B60Y2200/412 ,  B62D25/10 ,  E02F9/00 ,  E02F9/0866 ,  E02F9/0875 ,  E02F9/0883 ,  F01P1/06 ,  F01P3/20 ,  F01P5/02 ,  F01P11/04 ,  F01P11/10

Abstract: A construction machine includes a cooling fan (10) and a shroud (11). The cooling fan (10) sends air drawn in via a radiator (30) to an engine. The shroud (11) is disposed on an outer peripheral side of the cooling fan and forms a passage for air to be drawn in via the radiator. The construction machine includes a tank (12) and a cover (14B). The tank (12) is disposed superior to an upper end portion of the radiator and stores cooling water to be supplied to the radiator and the engine. The cover (14B) is disposed openably in an opening (14A) formed in a top surface plate (11B) of the shroud. The tank (12) is disposed at a position adjacent to the shroud (11) on a side closer to the engine side than the cover (14B) is.

公开(公告)号：US20190352883A1

公开(公告)日：2019-11-21

申请号：US16330325

申请日：2017-12-26

Applicant: Hitachi Construction Machinery Co., Ltd.

Inventor： Hitoshi NISHIGUCHI ,  Hidefumi HIRAMATSU ,  Tsuyoshi ONOZAKI

IPC: E02F9/22 ,  E02F9/08 ,  F15B11/08 ,  F15B11/12 ,  F15B13/043

Abstract: A bypass line (35) having one end side connected to a pilot delivery line (23) between a pilot pump (16) and a throttle (32) and the other end side connected to the pilot delivery line (23) between a check valve (33) and a pressure reducing valve type pilot valve (25) so as to bypass the throttle (32), a gate lock valve (27), and the check valve (33) provided in order from a pilot pump (16) is provided in the pilot delivery line (23). A lock switching valve (36) shutting down a flow of a pilot pressure oil from the pilot pump (16) through the bypass line (35) at a normal time and allowing the flow of the pilot pressure oil through the bypass line (35) when a pressure generated in the pilot delivery line (23) exceeds a predetermined pressure between the gate lock valve (27) and the check valve (33) is provided in the bypass line (35).

公开(公告)号：US20200256232A1

公开(公告)日：2020-08-13

申请号：US16642468

申请日：2019-01-31

Applicant: Hitachi Construction Machinery Co., Ltd.

Inventor： Toshinori FUJII ,  Hitoshi NISHIGUCHI ,  Masaharu IMI

IPC: F01N3/20 ,  F01N3/28

Abstract: There is provided a urea water supply device (25) that is disposed in a urea water pipe line (23) to supply urea water toward a urea water injection valve (21) from a urea water tank (22). A bracket (24) for attaching the urea water supply device (25) is attached to a revolving frame (5) of an upper revolving structure (3). A cover (31) for covering the urea water supply device (25) is attached to the bracket (24). On top of that, a urea water filter (33) that is disposed in the urea water pipe line (23) and traps foreign objects mixed into the urea water is attached to the cover (31).

公开(公告)号：US20160222869A1

公开(公告)日：2016-08-04

申请号：US15000501

申请日：2016-01-19

Applicant: Hitachi Construction Machinery Co., Ltd.

Inventor： Hitoshi NISHIGUCHI ,  Tomoyuki SAITO

IPC: F01P11/02

CPC classification number: F01P11/029

Abstract: An expansion tank, while maintaining gas-liquid separation performance of coolant circulating through an engine cooling apparatus, can absorb pressure variations occurring with volume change of the coolant even when an excessive amount of coolant is supplied. A bulkhead 42 partitions an expansion tank 30 into separate chambers R1 to R6 that communicate with each other via a first communication hole 44 positioned lower than a FULL line. The separate chambers R4 to R6 that constitute a separate chamber group X communicate with each other via a third communication hole 45a positioned higher than the FULL line. The separate chambers R1 to R3 that constitute a separate chamber group Y communicate with each other via a fourth communication hole 45b positioned higher than the FULL line. The separate chamber R1 and the separate chamber R4 communicate with each other via a second communication hole 45c disposed at the height of the FULL line.

Abstract translation: 膨胀箱同时保持通过发动机冷却装置循环的冷却剂的气液分离性能，即使在供给过量的冷却剂时也能够吸收随着冷却剂体积变化而发生的压力变化。 隔板42将膨胀箱30分隔成通过位于低于FULL线的第一连通孔44彼此连通的分开的室R1至R6。 构成分离室组X的分离室R4〜R6通过位于高于FULL线的第三连通孔45a相互连通。 构成分离室组Y的分离室R1〜R3通过位于高于FULL线的第四连通孔45b而相互连通。 分离室R1和分离室R4通过布置在FULL线的高度处的第二连通孔45c相互连通。