| 摘要 |
<p>1481383 Valves GENERAL MOTORS CORP 13 Aug 1975 [3 Sept 1974] 33727/75 Heading F2V [Also in Division F1] An I.C. engine induction air flow control device comprises an air flow conduit having a primary air inlet 28 and an air outlet 30 at opposite ends, an auxiliary air inlet (opening 34) connected by a channel (36) Fig. 5 (not shown), to the conduit, a damper 42 having a main portion 54 in the conduit to control air flow through the primary inlet 28 and an auxiliary portion 56 in the channel 36 to control air flow through the auxiliary inlet 34 independent of the rate of air flow therethrough by sliding across the auxiliary inlet. The damper is pivoted to move between a position wherein the main portion 54 obstructs flow through primary inlet 28 and auxiliary portion 56 permits flow through the auxiliary inlet 36 and a position wherein the main portion 54 permits air flow through primary inlet 28 and the auxiliary portion 56 obstructs air flow through the auxiliary inlet 36. The damper 42 is connected to a lever 40 by way of a torsion spring 48, both members 40, 42 being independently pivoted about a pin 44. A bimetal coil 62 acts on the lever 40 through a control arm 58. At low temperature and low air flow rate, the damper 42 occupies the position shown in Fig. 2, obstructing flow through ambient air inlet 28 and permitting heated air to flow through the auxiliary air inlet openings 34. At low temperature and high air flow rate, the damper 42 occupies the Fig. 3 position, with flow permitted through inlet 28 and prevented through inlet openings 34. At higher temperatures, the bimetal coil 62 rotates the arm 58 clockwise allowing the lever 40 to rotate anticlockwise so that the damper 42 occupies the Fig. 3 position at all air flow rates. At intermediate temperatures, the position of the lever 40 is such that at normal flow rates air passes through both inlets 28 and 34 but at high flow rates it passes only through inlet 28 because the auxiliary portion 56 of the damper 42 closes the inlet openings 34.</p> |
