| 摘要 |
<p>PURPOSE:To obtain both easy 'off-operation' and inexpensive, operation structure by providing both a pressure oil chamber, which is constantly supplied with oil, and a relief circuit to a friction clutch, thus adopting a totally hydraulic operation system in order to reduce the operating physical force. CONSTITUTION:A pressure oil chamber 8 is formed between a driving-side revolving body 2 and a driven-side revolving body 5 in order to operate the main clutch A. A hydraulic pump 9 is connected to this hydraulic chamber 8 via oil passages 1A and 3A, which are formed on the driving-side shaft 1 and the driven-side shaft 3, respectively so that the hydraulic chamber 8 can constantly be supplied with oil. In addition, a relief circuit 17 with a relief valve 16, which automatically relieves the internal pressure of the hydraulic chamber 8 when the main clutch A is turned off, is interposed between the hydraulic pump 9 and the hydraulic chamber 8. Accordingly, even when an operator treads down an operation pedal 14 deeply in order to turn the main clutch A off, he can turn the main clutch A off with a certain, depressing- operation force, or without increasing this depressing-operation force.</p> |
