Cooling system for work machine

Details Cooling system for work machine Cooling system for work machine

2005-11-01

2005-11-01

Kamen, Noah P. (Department: 3747)

Internal-combustion engines

Cooling

Devices for cooling liquid by air flow

C123S041120, C060S493000

Reexamination Certificate

active

06959671

ABSTRACT:
A cooling system for use in a work machine is provided, in which an increase in the load imposed on a fan driving circuit and occurrence of abnormal noise can be prevented without fail by means of an inexpensive arrangement at the time of switching the rotating direction of a cooling fan. To this end, the cooling system comprises: (1) a variable displacement hydraulic pump driven by the engine; (2) a forwardly and reversely rotatable hydraulic motor operated by hydraulic oil supplied from the hydraulic pump; (3) a cooling fan driven by the hydraulic motor; (4) an electromagnetic selector valve for switching the rotating direction of the hydraulic motor between a forward direction and a reverse direction; (5) controlling means for controlling switching of the electromagnetic selector valve and controlling the hydraulic pump so as to minimize the discharge oil rate of the hydraulic pump during switching of the electromagnetic selector valve.

REFERENCES:
patent: 5165377 (1992-11-01), Hosseini
patent: 6076488 (2000-06-01), Yamagishi
patent: 6286308 (2001-09-01), Yoshida et al.
patent: 6311488 (2001-11-01), Maruta et al.
patent: 6349882 (2002-02-01), Kita et al.
patent: 6481388 (2002-11-01), Yamamoto
patent: 10-068142 (1998-03-01), None
patent: 11-193719 (1999-07-01), None

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