| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a solenoid in which the number of windings of a coil is increased without enlarging the external size of the solenoid and strength to be necessary for a coil bobbin can be secured while increasing such attracting force that a plunger is attracted to an attraction surface by magnetic force thereof. <P>SOLUTION: A second outside diameter part 322 of the coil bobbin 3 is continuously connected to a first outside diameter part 321, is used as the outer peripheral surface of the coil bobbin 3, and starts to be parted from the sliding surface A in the direction parallel to the center axis O of each of the coil bobbin 3 and the plunger 2. Accordingly, the pressure by an oil 7 as a fluid is not exerted on the second outside diameter part 322 even when the outside diameter of the second outside diameter part 322 is smaller than that of the first outside diameter part 321, for example, around 1 mm, and the coil bobbin 3 can be prevented from being damaged by the pressure by the oil 7 without enlarging the solenoid 1. <P>COPYRIGHT: (C)2013,JPO&INPIT |
