GB1339327A - Mechanical servo devices - Google Patents

Abstract

1339327 Clutch control; toggles AUTOMOTIVE PRODUCTS CO Ltd 23 Feb 1972 [31 March 1971] 8325/71 Headings F2L and F2K In a clutch release mechanism for a spring engaged friction clutch in which a member 16, 64 is arranged for translational movement by an operator to effect release of the clutch, a mechanical servo comprising spring means which exert a force normal to the direction of movement of the member 16, 64 are provided, these means exerting a component of force to aid the movement of the member when the mechanism is operated to release the clutch. The device shown in Fig. 1 comprises a rod 16 acted on by an overcentre toggle arrangement comprising pivoted links 26, there being springs connected between pivots 33, these springs aiding movement of rod 16 to operate clutch 10 via master and slave cylinders 14 and 13 after initial movement of pedal 15. Further embodiments operating in a similar manner, but with alternative means of arranging the links or mounting the springs, are described, these springs being tension (Figs. 3, 5 and 7, not shown), compression (Figs. 8 and 13) or leaf springs (Fig. 14). A further series of embodiments has cam surfaces acted upon by sprung rollers to provide the overcentre action, two types being shown in Figs. 10 and 12, Fig. 10 having rollers 76 sprung by leaf springs 79 acting on cam surfaces 75 of the clutch operating member 64 and Fig. 12 having the rollers 81 pivoted to a member 86 on the rod 64 and acting outwardly on cam surfaces 82. Further alternatives are also described (Figs. 9, 11 and 15, not shown).