| 摘要 |
1,066,876. Friction clutches; controlling clutches; springs. SOC. ANON. FRANCAISE DU FERODO. April 2, 1965 [April 3, 1964], No. 14125/65. Headings F2C, F2L and F2S. A diaphragm spring for a friction clutch (Fig. 1, not shown) has radial slots, forming spring fingers 23, which slots are each formed with an inner portion 22, adjacent the spring axis, having a lesser width than a second portion 40 formed adjacent, or extending from (Fig. 4, not shown), the spring pivot pin mounting holes 24, the arrangement providing improved contact between the spring fingers 23 and the contacting rib of a release member (27) (Figs. 1 and 7, not shown), the holes 40 additionally improving ventilation of the clutch. The rigidity of the spring fingers may be increased by deformed raised edges (41a) (Figs. 4 and 5, not shown) of enlarged ventilation holes extending from the mounting holes 24, or, by curving or cambering the levers 23 in crosssection. In Fig. 7 (not shown), the inner narrow portions (43) are punched out and completed by a sanding operation or a chemical, electrolytic or electro-chemical treatment to remove burrs. Clearance for the spring fingers may further be obtained directly, by retaining several slots cut out along their full length (Fig. 7, not shown). The diaphragm spring may be polished or ground to improve contact between the spring fingers and the release member (27). In Figs. 4 to 6 (not shown), the inner ends of the spring fingers have forged chamfers (42). The fulcrum rings (25), Figs. 9 to 11 (not shown), arranged one each side of the diaphragm spring may be mild steel closed strips or wires having their ends joined by a weld (45), the flash burr of which is limited to a square circumscribing the cross-section of the wire, the burr (45) being reduced to size by forging and trimming, after which the fulcrum rings (25) are cyanide hardened. Alternatively, the fulcrum rings may be nylon. The rotary outer race of the usual clutch-release ball-bearing (34), or carbon block, acts on the diaphragm spring fingers 23 through a ribbed case-hardened steel ring (27) secured to the clutch cover (17) by tangential strips (28) and carrying a bonded friction facing (33) of asbestos impregnated with resin or Teflon, or of nitrided steel. |
