Patent GB-568904-A (GB)
Title: Improvements in rotary ignition distributors for internal combustion engines
IPC: F02P7/02
Filed: 1943-10-12
Abstract: 568,904. Ignition timing. BENDIX AVIATION CORPORATION. Oct. 12, 1943, No. 16746. Convention date, Oct. 15, 1942. [Class 7 (iv)] [Also in Groups XXVI, XXVIII, XXXVI and XXXVII] The rotatable current-distributing member of ignition apparatus is housed in one chamber of an enclosing casing, a torus-like second chamber in which surrounds the drive shaft for the distributing member and houses the currentconducting cables, a plurality of terminals which bring the cables and rotating member into conducting relation with one another being mounted on the separating means between the two chambers. The metal casing 1 has an annular flange 8, 9 forming a chamber 7 in which the leads 18 to the several fixed contacts 19 are embedded in solid insulation which also fills the harness 12 and orifice 10 communicating therewith. Each terminal 19 is threaded in a, metal tube 17 moulded in the insulator 15 and co-operates with a pair of arms 40 (only one shown), one of which is connected to a carbon centre-contact 43 in the rotor 24, whereas the other is connected to ring 42 cooperating with conductor 49 for giving a boosting current during starting, the conductors 49, 48 being carried in an insulating body 45 on the cover. The rotor body 24 of hard rubber, " Melma,c " or " Bakelite " (Registered Trade Mark), is carried on a spindle 31 adjustably mounted in the driving sleeve 29 which in turn is mounted in. bearings in member 25. The adjustable coupling between 29, 31 comprises a ring 33 loose on shaft 31 having oppositelydirected ratchet teeth engaging corresponding teeth respectively on the end of sleeve 29 and on the enlarged end of shaft 31, the number of teeth on opposite faces of 33 differing by one, so as to permit fine adjustment. The internal walls of casing 1 and harness 12 are insulationsprayed, and a suitable filling compound is polymerized cashew-nut-shell oil mixed with a drying agent such as para-formaldehyde or formaldehyde and inserted in liquid form. Alternatively, the harness may be filled with compressed air from a pump in the distributer casing. Thus, in Fig. 6, the sleeve 29 drives by splines a sleeve 78 which is formed with an eccentric part 79 carrying a ball race 80. The outer race engages a push-rod 72 operating through rod 71 a spring-returned diaphragm 59 which, when moved to the left, sucks atmospheric air through one-way valve 61 and, when moved to the right, blows the air through oneway valve 63 and channels 64, 66 into the casing 1. Lubricant for rod 72 is fed through porous metal bushing from a pad 72a, and grease cup 81. is provided for rod 71. A " Gits " seal 82 for lower end of sleeve 78 maintains the casing air-tight. Figs. 7, 8 show a form using a rotary pump in the casing 83, 84. The rotor comprises centrifugal vanes 89 in a slotted body 86 secured by elements 87 to a sleeve 85 on shaft 29. The pump casing comprises end plates 90 and cylinder 91 having a groove 97a extending from inlet 97 in the direction of rotation. The casing is arranged eccentrically to the rotor-axis, the plates 90 being separated from 85 by bearing rings 92 and the proper clearance being maintained by thrust washers 92a. A combined cushioning and lubricating pad surrounds the pump casing, the oil being inserted at 94 and kept by sealing members 95 from the bearings 28. Air is drawn in through passage 96 and port 97 having a rubber tube 100, and expelled through a similarly-arranged port 98 to the casing 1 and, if desired, chamber 7. A relief valve 102 is normally closed by a bellows B which opens the valve when the casing-pressure is excessive. The pump-rotor may be hollowed out for lightness, Fig. 9 (not shown), and the drive thereto may include a shearable key in case of pump-seizure. In case of failure of one distributer of a dual ignition system, the other can still provide the compressed air, Fig. 11 (not shown), in connection with which Specifications 572,441, 572,465, 572,466 and 572,467, [all in Group XXXV], are referred to. Specification 540,618, [Group XXXVI], also is referred to.