GB983150A - Control apparatus for hydraulically operated clutches - Google Patents

Abstract

983,150. Clutch control. K. HAUSSERMANN, H. HAUSSERMANN, L. HAUSSERMANN, [trading as LAMELLEN UND KUPPLUNGSBAU AUGUST HAUSSERMANN]. April 12, 1961 [April 12, 1960], No. 13113/61. Headings F2C and F2L. An hydraulically engaged friction clutch in a vehicle transmission which is disengaged on actuation of the gear-shift lever comprises a driving flywheel 1 fast with a back plate la on which is mounted an annular diaphragm 2 acting on the clutch presser plate 3. Supply and exhaust of pressure liquid to the annular chamber behind the diaphragm is controlled by valve sleeves 15, 16 axially slidable on projections 13, 14 of the back plate 1a. Liquid is drawn from a sump 19 by an input driven pump 9 and supplied through an annular passage 22 to a passage 23 in the back plate leading to the projection 14. The valve sleeve 16 in the inward position shown connects the passage 23 to a passage 24 leading to the annular chamber, and an exhaust passage 26 in the projection 13 is blocked by the sleeve 15. In the outer position of the sleeves passage 23 is blocked and passage 26 opened to exhaust the chamber and permit springs 38 to disengage the clutch. The sleeves 15, 16 are controlled by a common collar 30 having a peripheral groove engaged by lugs 27, 28 on the sleeves. The collar 30 is held from rotation and may be shifted to the right by electromagnetic or other means on actuating the gear-shift lever, and be biased to the left by springs. The groove has wide portions bounded by side walls 30<SP>1</SP>, 3011 with intervening narrow portions. On shifting the collar to the right or left, as viewed in Fig. 1, when the valve sleeve lugs are in a wide part of the groove the sleeves first remain in position, then the lugs engage a side wall 30<SP>1</SP> or 30<SP>11</SP> and the sleeves are shifted to the right or left. At the end of this movement spring-loaded balls 35 mounted in bores in the valve sleeves 15, 16 engage holes 32 in a detent stirrup 31 and give a slight further movement to the valve sleeves so that the lugs are held in a mid-position out of contact with the side walls of the groove and the valve sleeves are retained in their end positions. Specification 981,593 is referred to.