Electric construction machine

• US 8,631,890 B2
• Filed: 05/24/2011
• Issued: 01/21/2014
• Est. Priority Date: 06/15/2010
• Status: Expired due to Fees

• Current Assignee: Hitachi Construction Machinery Tierra Co.,Ltd. (Hitachi Construction Machinery (China) Co., Ltd.)
• Original Assignee: Hitachi Construction Machinery Company Limited (Hitachi, Ltd.)
• Inventors: Noguchi, Akira, Yunoue, Masayuki
• Primary Examiner(s): Olszewski, John R
• Assistant Examiner(s): CLEMMONS, STEVE M
• Application Number:
  US13/513,894
• Publication Number:
  US 20130075171A1
• Time in Patent Office: 973 Days
• Field of Search: 180/68.1, 180/68.2, 180/68.5, 180/311, 361/676, 361/678, 361/695, 361/679.49, 361/679.5, 361/724, 429/148, 429/163, 429/167, 429175-177, 383/100
• US Class Current: 180/68.1
• CPC Class Codes: B60K 1/04 of the electric storage means for propulsion exchanging batteries for electric propulsion of vehicles B60L53/80; for auxiliary purposes only B60R16/04; supplying batteries to, or removing batteries from, vehicles B60S5/06
• CPC Class Codes: B60K 11/06 with air cooling
• CPC Class Codes: B60K 2001/005 the electric storage means
• CPC Class Codes: B60Y 2200/412 Excavators
• CPC Class Codes: E02F 9/0858 Arrangement of component parts installed on superstructures not otherwise provided for, e.g. electric components, fenders, air-conditioning units E02F9/16, E02F9/18 take precedence
• CPC Class Codes: E02F 9/0866 Engine compartment, e.g. heat exchangers, exhaust filters, cooling devices, silencers, mufflers, position of hydraulic pumps in the engine compartment
• CPC Class Codes: E02F 9/207 of the type electric propulsion units, e.g. electric motors or generators

Abstract

The object of the present invention is to provide an electric construction machine capable of efficiently cooling the battery mounted on the swing structure. To achieve the object, there is provided an electric construction machine in which a battery storage room 11 is formed in the swing structure 3 and a plurality of batteries 231 as electric power sources are arranged in the battery storage room 11, comprising: a battery storage structure 23 storing the batteries 231 and having an air flow channel through which air can flow upward from a lower part of the battery storage structure 23; a covering sheet 26 entirely covering the top and side faces of the battery storage structure 23; and a duct 27 for discharging the air, one end of which is arranged in an upper part of the covering sheet 26.

Claims

1. An electric construction machine in which a battery storage room is formed in a rear part of a swing structure and a plurality of batteries as electric power sources are arranged in the battery storage room, comprising:

a battery storage structure storing the batteries and having an air flow channel through which air can flow upward from a lower part of the battery storage structure;

a flexible covering sheet entirely covering the top and side faces of the battery storage structure; and

a duct for discharging the air, one end of which is arranged in an upper part of the covering sheet,

wherein the swing structure includes two rear beams extending in the longitudinal direction of the swing structure in a rear part thereof and mounting the battery storage structure thereon, and

wherein the battery storage structure includes plural stages of battery tables each having a plurality of air vents and storing and holding the batteries in multiple stages in the vertical direction and in multiple columns in the transverse direction of the swing structure, the two rear beams forming a space therebetween for taking in air and the plurality of air vents forming an air flow channel through which air flows upwards from the lowermost stage to the uppermost stage.

2. The electric construction machine according to claim 1, wherein the other end of the duct is connected to a room from which air is forcefully discharged.

3. The electric construction machine according to claim 2, wherein the room from which air is forcefully discharged is a machine room which is provided in the swing structure to store devices including a hydraulic pump, an electric motor, an inverter, an oil tank, a heat exchanger, a cooling fan and which discharges air from the inside to the outside of the room with the cooling fan.

4. The electric construction machine according to claim 3, wherein the one end of the duct is connected to the top of the covering sheet.

5. The electric construction machine according to claim 3, wherein the one end of the duct is connected to an upper part of one of the side faces of the covering sheet.

6. The electric construction machine according to claim 3, wherein the covering sheet is formed of a waterproof sheet.

7. The electric construction machine according to claim 3, wherein the covering sheet is formed of an antistatic sheet.

8. The electric construction machine according to claim 2, wherein the other end of the duct is equipped with an exhaust fan.

9. The electric construction machine according to claim 8, wherein the one end of the duct is connected to the top of the covering sheet.

10. The electric construction machine according to claim 8, wherein the one end of the duct is connected to an upper part of one of the side faces of the covering sheet.

11. The electric construction machine according to claim 8, wherein the covering sheet is formed of a waterproof sheet.

12. The electric construction machine according to claim 8, wherein the covering sheet is formed of an antistatic sheet.

13. The electric construction machine according to claim 2, wherein the one end of the duct is connected to the top of the covering sheet.

14. The electric construction machine according to claim 2, wherein the one end of the duct is connected to an upper part of one of the side faces of the covering sheet.

15. The electric construction machine according to claim 2, wherein the covering sheet is formed of a waterproof sheet.

16. The electric construction machine according to claim 2, wherein the covering sheet is formed of an antistatic sheet.

17. The electric construction machine according to claim 1, wherein the one end of the duct is connected to the top of the covering sheet.

18. The electric construction machine according to claim 17, wherein the covering sheet is formed of a waterproof sheet.

19. The electric construction machine according to claim 17, wherein the covering sheet is formed of an antistatic sheet.

20. The electric construction machine according to claim 1, wherein the one end of the duct is connected to an upper part of one of the side faces of the covering sheet.

21. The electric construction machine according to claim 20, wherein the covering sheet is formed of a waterproof sheet.

22. The electric construction machine according to claim 20, wherein the covering sheet is formed of an antistatic sheet.

23. The electric construction machine according to claim 1, wherein the covering sheet is formed of an antistatic sheet.

24. The electric construction machine according to claim 1, wherein the one end of the duct is connected to an upper part of one of the side faces of the covering sheet.

25. The electric construction machine according to claim 1, wherein the covering sheet is formed of a waterproof sheet.