| 摘要 |
<p>PURPOSE:To make unnecessary special constitution because of the oil tightness of the device and to reduce the cost of the device by making a rotation detecting portion resistant to oil, and disposing above the oil level a base con nected to the detecting portion. CONSTITUTION:The detecting portion 33 of a detector 30 is made oil-resistant so as to prevent foreign material other than hydraulic oil 2 from entering a space defined by a bushing 35 mounted to the portion of the wiring 36 of a case 30b and by a bearing portion 30c and from attaching to the detecting portion 33. Also, a base 44 electrically connected to the detecting portion 33 by the wiring 36 is disposed inside a box body 41 of drip-proof structure disposed at a position above the maximum level of the hydraulic oil 2 inside an oil tank 1. Alternatively, the base may be disposed inside a control board 20 and electrically connected to the detecting portion 33. Thereby the cost of the detector 30 is reduced and malfunctioning of the detector 30 is prevented.</p> |
