| 摘要 |
PURPOSE:To operate the shift valve exactly and prevent overrun of the engine, by short-circuiting the supply oil passage and the governor oil passage by use of the short-circuit oil passage equipped with the orifice. CONSTITUTION:The supply oil passage 11 is communicated with the pressure source such as an oil pump, etc., and the governor oil passage 12 is communicated with the valve mechanism such as a shift valve, etc. Also, the short-circuit oil passage 14 by which the governor 1 is by-passed is provided between the supply oil passage 11 and the governor oil passage 12, and the orifice 15 is provided in the short-circuit oil passage 14. Accordingly, since oil pressure in the supply oil passage 11 is directly supplied to the governor oil passage 12, the maximum governor pressure increases and approaches by the supply pressure. As a result, the shift valve is operated exactly, and therefore, overrun of the engine is prevented from generation. |
