Patent GB-474294-A (GB)
Title: Improvements in and relating to power transmission mechanisms for automotive vehicles and the like
IPC: B60K25/00
Filed: 1936-04-27
Abstract: 474,294. Motor vehicles; driving air compressors and auxiliary machines. DAVEY, P. H. April 27, 1936, No. 11987. [Classes 79 (ii) and 79 (iii)] A power take-off unit adapted to be inserted in a driving shaft on a vehicle or machine to drive auxiliary mechanism comprises a shaft having two sections, one section being driven from the driving shaft, and the other section being driven from the first section, both sections being supported in self-aligning bearings on the vehicle frame so that warping of the frame does not affect the power takeoff unit. In the construction shown in Fig. 10 a first shaft section 501 is driven from a vehicle change-speed gear (not shown) through a universal joint 504 and can drive, at will, either the road wheels (not shown) through a second shaft section 519 and a universal joint 521, or a power-transmitting pulley 532, the shaft sections 501, 519 being mounted on the vehicle frame 513, 527 by means of selfaligning bearings 506, 524. The two shaft sections are kept in relative alignment by bearings 514, 517. The first shaft section 501 is slidably connected to the universal joint 504 by splines 502, and a clutch member 539 is also slidably mounted on these splines so that it can be shifted axially to cause clutch teeth 542 thereon to engage either clutch teeth 516 on the shaft 519 as shown, or clutch teeth 537 on the pulley 532. The pulley 532 is mounted on bearings 529, 531 on the shaft section 519. Grease nipples 544, 552 and 554 are provided, together with corresponding lubricant passages. When grease is being forced through the nipple 544 air can escape past a relief valve 549. In the construction shown in Figs. 5 and 6, the first shaft section 201, driven from the vehicle gear-box, can be connected by a slidable clutch member 224 having clutch teeth 223 either with clutch teeth 225 on the second shaft section 202 to drive the vehicle wheels, or with clutch teeth 236 on a power pulley 235, or with clutch teeth 251 on a power pulley 247. The shaft sections 201, 202 are kept in relative alignment by bearings 215, 216, and are mounted on the vehicle frame in self-aligning bearings 211, 212. Pulley 235 is mounted on bearings 232 on shaft section 202, and pulley 247 is mounted on bearings 245 on pulley 235. The pulley 247 drives a dynamo 268 through a belt or belts 266, and the pulley 235 drives an air compressor 272 through a belt 269. An additional pulley or pulleys may e mounted coaxially with the pulleys 235, 247 and be driven in a similar manner: Modifications are described in which the power pulley may be driven at the same time as the vehicle wheels are driven. In the construction shown in Fig. 9, a first shaft section 381 is aligned with the second shaft section 382 by bearings 425, 426, and the shaft sections are mounted on vehicle frame members 405, 392 in self-aligning bearings 401, 397 respectively. The shaft section 381 is driven from the vehicle gear-box (not shown) and can be connected by a slidable clutch member 415, 416 either to clutch teeth 428 on shaft section 382 to drive the vehicle wheels,. or to clutch teeth 436 on an eccentric 437 to drive an air pump 444 mounted concentrically with the shaft sections by means of bearings 407,455. The pump is prevented from rotating by bars 458 fixed thereto and to the vehicle frame. The eccentric 437 drives the pistons 449 by means of side-by-side straps 453, the cylinders 444 being slightly out of line to allow each strap to be connected to a central rod 452. The eccentric is mounted on shaft section 382 by bearings 432, 433. - The sliding clutch member 415 is operated by the driver by means of a rod 424 and clutch fork 418.