CONSTRUCTION MACHINE

• US 20120205171A1
• Filed: 05/20/2011
• Published: 08/16/2012
• Est. Priority Date: 06/09/2010
• Status: Active Grant

• Current Assignee: Hitachi Construction Machinery Tierra Co.,Ltd. (Hitachi Construction Machinery (China) Co., Ltd.)
• Original Assignee: Hitachi Construction Machinery Company Limited (Hitachi, Ltd.)
• Inventors: Takishita, Tatsuo, Nasu, Katsuyoshi, Kurikuma, Hajime
• Granted Patent: US 8,672,072 B2
• Time in Patent Office: Days
• US Class Current: 180/68.1
• CPC Class Codes: B60K 1/00 Arrangement or mounting of electrical propulsion units B60K7/00 takes precedence; arrangement or mounting of plural diverse prime-movers for mutual or common propulsion B60K6/00; electric transmission arrangements B60K17/12; electric equipment or propulsion of electrically-propelled vehicles per se B60L; current-collectors for power supply lines of electrically-propelled vehicles B60L5/00
• CPC Class Codes: B60K 11/02 with liquid cooling
• CPC Class Codes: B60K 11/04 Arrangement or mounting of radiators, radiator shutters, or radiator blinds B60K11/085 takes precedence
• CPC Class Codes: B60K 11/06 with air cooling
• CPC Class Codes: B60K 2001/003 with means for cooling the electrical propulsion units
• CPC Class Codes: B60K 2001/006 the electric motors
• CPC Class Codes: B60K 2025/005 driven by electric motors forming part of the propulsion unit
• CPC Class Codes: B60K 2025/026 by a hydraulic transmission
• CPC Class Codes: B60K 25/02 directly from an engine shaft
• CPC Class Codes: B60Y 2200/412 Excavators
• CPC Class Codes: E02F 9/207 of the type electric propulsion units, e.g. electric motors or generators
• CPC Class Codes: E02F 9/2091 Control of energy storage means for electrical energy, e.g. battery or capacitors energy recovery arrangements in hydraulic or pneumatic drives E02F9/2217
• CPC Class Codes: E02F 9/2095 Control of electric, electro-mechanical or mechanical equipment not otherwise provided for, e.g. ventilators, electro-driven fans control of hydraulic driven equipment E02F9/22
• CPC Class Codes: E02F 9/2285 Pilot-operated systems

Abstract

A construction machine that can limit consumption of battery electric power is provided. The construction machine includes: air-cooled heat exchangers 47, 48; a cooling fan 49 for generating cooling air for the heat exchangers 47, 48; a fan electric drive motor 50 that is driven by electric power of a battery 8 for rotating the cooling fan 49; an inverter unit 30 for drivingly controlling the fan electric drive motor 50; a lock lever 25 disposed at a boarding-alighting port and configured to be operated into an unlocked position and a locked position; and a lock valve 42 for making an operation of an operating device 27 or the like ineffective or the operating device inoperative when the lock lever 25 is operated into the locked position. The inverter unit 30 stops the fan electric drive motor 50 when the lock lever 25 is operated into the locked position.

Claims

1. A construction machine comprising:

an air-cooled heat exchanger;

a cooling fan for generating cooling air for the heat exchanger;

a battery;

a fan electric drive device for rotating the cooling fan, the fan electric drive device being driven by electric power of the battery;

fan control means for drivingly controlling the fan electric drive device;

a lock lever disposed at a boarding-alighting port and configured to be operated into an unlocked position and a locked position;

an operating device for directing an operation of a hydraulic actuator; and

locking means for making an operation of the operating device ineffective or the operating device inoperative when the lock lever is operated into the locked position, wherein;

the fan control means stops the fan electric drive device when the lock lever is operated into the locked position.

2. The construction machine according to claim 1, further comprising:

operation detecting means for detecting whether the operating device is in a condition of not being operated, wherein;

the fan control means stops the fan electric drive device when a predetermined period of time elapses under a condition in which the lock lever is operated into the unlocked position and the operating device is in the condition of not being operated.

3. The construction machine according to claim 1, further comprising:

a main pump for generating hydraulic fluid to be supplied to the hydraulic actuator;

a main electric drive motor for driving the main pump, the main electric drive motor being driven by the electric power of the battery; and

main control means for drivingly controlling the main electric drive motor, wherein;

the main control means stops the main electric drive motor when the lock lever is operated into the locked position.

4. The construction machine according to claim 3, wherein:

the main control means stops the main electric drive motor when a predetermined period of time elapses under a condition in which the lock lever is operated into the unlocked position and the operating device is in the condition of not being operated.

5. The construction machine according to claim 2, further comprising:

a main pump for generating hydraulic fluid to be supplied to the hydraulic actuator;

a main electric drive motor for driving the main pump, the main electric drive motor being driven by the electric power of the battery; and

main control means for drivingly controlling the main electric drive motor, wherein;

the main control means stops the main electric drive motor when the lock lever is operated into the locked position.