GB1308318A - Power plants for tractive vehicles - Google Patents

Abstract

1308318 Motor vehicle power plant PERKINS ENGINES Ltd 18 May 1970 [4 June 1969] 28337/69 Heading B7H The two axles of a shovel loader are selectively driven either through a first transmission path by an internal combustion or through a second transmission path by hydrostatic motors 31, 32 supplied from an hydraulic accumulator charged by an engine-driven pump 26. The engine 1 drives the planet carrier 3 of a first planetery train 2 having an annular gear which drives the impeller 10 of a torque converter 11 and a sunwheel 5 which is connected through intermediate gears 6 to a supercharger 7 for the engine 1. The turbine 12 of the torque converter is connected through a transfer gearbox 13 to output shafts 14, 15 which drives the planet carriers 18, 19 of second and third planetary trains 16, 17 having sunwheels 20 which drive the differentials 22, 23 of the two axles through universally-jointed shafts 24, 25 and annulargears 33, 34 which carry external gears 37, 38 in mesh with pinions 35, 36 connected to the motors 31, 32. An external gear 28 on the annular gear 9 of the first planetary train 2 meshes with a pinion 29 which drives a pump 27 supplying a control unit for rams controlling movements of the shovel bucket and lift arms of the machine. In operation, when the bucket is to be driven into the material to be loaded the driver actuates a valve which connects the hydraulic accumulator to the motors 31, 32 and also to an hydraulic actuator for applying a brake 30 so that a high-torque low-speed drive is obtained and the engine power is available for bucket movements.