| 摘要 |
<p>1,146,236. Friction clutches. TWIN DISC CLUTCH CO. 4 May, 1967 [5 May, 1966], No. 20754/67. Heading F2C. In an hydraulically operated continuously slipping friction clutch of the type described in Specification 1,146,234, wherein the speed of the clutch input or output member is maintained constant by a valve D which varies the pressure supplied to the clutch engaging servo C1 in response to centrifugal force and an opposed control pressure, the valve is a ball valve. As shown, pressure liquid supplied through a duct 1 acts on the ball valve D in opposition to centrifugal force and the valve meters the liquid to the servo chamber C1. An orifice F continuously bleeds the chamber C1 so that when the valve D is closed the clutch engagement is reduced. In order to maintain the valve ball D small an additional ball D1 having the necessary mass to provide the required centrifugal force acts directly (Fig. 3, not shown) or through an intermediate ball d on the valve ball D. In Fig. 4 (not shown), the required centrifugal force is reduced by supplying the control pressure to an additional ball (d2) which acts through the ball (D1) on the valve ball (D) in opposition to the control pressure acting directly thereon. In Fig. 5 (not shown), the servo chamber (C1) is continuously supplied with pressure liquid through an orifice (F) and the valve (D) controls the exhaust from the chamber. In Fig. 6 (not shown), the pressure supply (2) to the servo chamber (C1) which is controlled by the valve (D) is independent from the control pressure (1) acting on the valve. In Figs. 7 and 8 (not shown) the valve D is carried by the input member and a speed increase of the input member causes increased clutch engagement and thus additionally loads the input member to maintain its speed constant. In Fig. 1 (not shown), the clutch drives the input member of a torque converter in series therewith.</p> |
