GB951038A - Improvements in or relating to reversing gears - Google Patents

Abstract

951,038. Reverse gear and control; friction clutches. VOLVO-PENTA A.B. Nov. 22, 1962 [Nov. 24, 1961 ; Sept. 10, 1962], No. 44272/62. Headings F2C and F2D. In a forward-neutral-reverse gear for a marine outboard motor, forward or reverse opposed bevel gears 1, 2 freely carried by an output shaft 3 and meshing a driving bevel pinion fast with an input shaft, are selectively clutched to the shaft 3 by a double-ended slidable friction cone clutch member 7 helically splined on the shaft 3 to provide a self-tightening action on clutch engagement. The clutch member 7 is normally engaged by a spring with the forward drive bevel 1 and controlled by two electromagnetic devices 12, 14 which when energized, respectively serve to disengage the clutch member 7 and engage it, against the spring bias, with the reverse bevel 2, the member 7 being formed with a central groove 9 provided each side with inclined cam surfaces 11. On energization of the magnet 12, a pin 13 moves radially inwards to engage one of the cam surfaces 11 whereby the member 7 is moved to a central neutral position and locked there by further penetration of the pin 13 into the groove 9. Reverse is engaged by energizing the magnet 14, or operating a manual lever 16, to turn an eccentric pin 15 permanently engaging the groove 9, which moves the clutch member 7 into engagement with the reverse bevel 2, the pin 13 being withdrawn when the pin 15 starts to rotate, the control devices 12, 14 being electrically interconnected to prevent the pin 13 locking the member 7. The spring 8 may be omitted in which case the clutch member 7 by its own weight engages the bevel 2 for forward drive, reverse then being effected through the bevel 1, the input shaft being driven in the opposite direction to the former arrangement or, a reversible pitch propeller is used. In Fig. 4 the clutch member is controlled solely by an eccentric pin such as 15, Fig. 1, the rock shaft 31 of which is turned by manually rocking a shaft 34 having an eccentric 35 engaging a V- groove in the shaft 31 through a spring loaded ball 40 which serves to resiliently maintain the shift device in either extreme engaged position whilst the manual rock shaft can be further rotated to perform additional functions such as to increase the engine fuel supply. In Fig. 6, the shaft 41 carrying the eccentrically mounted clutch shift pin is rotated by a forked arm 42 operated by a control lever 43 through a link 44 spring loaded against the bottom of the forked arm such that, as before, on further rotation of the operating lever beyond that required for clutch engagement, the rod rides up the slot of the lever against the spring bias.