| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heat exchanger for constituting an oil temperature control system which has improved capability of reducing extra pressure loss along with the circulation of operating oil and controlling the temperature of the operating oil. <P>SOLUTION: The heat exchanger 12 includes a bypass oil path 23 provided between an introduction side end 20a and a return side end 20b of an operating oil flow path 20 for bypassing a heat exchange part 22 when circulating operating oil, and an operating oil delivery path 24 for delivering the operating oil from the return side end 20b to a cooling oil path 13. It also includes a four-way valve 25 for changing over the conditions of communicating the bypassing oil path 23 and the operating oil delivery path 24 with the return side end 20b of the operating oil flow path 20 into a warming mode, a steady mode, or a cooling mode. The four-way valve 25 is controlled to change over them in accordance with an external signal. <P>COPYRIGHT: (C)2010,JPO&INPIT |
