Patent GB-523246-A (GB)
Title: Improvements in or relating to transmission synchronizers
IPC: F16D23/06
Filed: 1938-09-29
Abstract: 523,246. Claw clutches. STEVENS, A. H. (Borg-Warner Corporation). Sept. 29, 1938, No. 28327. [Class 80 (ii)] A claw clutch comprises a movable jaw clutch element slidable along an axially fixed member of the clutch to engage the other clutch member, a synchronizing and blocking ring carried on the axially fixed member, having a lost motion connection therewith and adapted to be moved by thrust members arranged to receive axial thrust from the movable clutch element, the ring being adapted to engage a friction surface on the other clutch element so as to be moved into a position to block the path of axial movement of the clutch element until synchronization is reached. In the double clutch shown in Figs. 1 and 2, wherein internal teeth 15 on the movable clutch member 14, splined on a member 12 fixed to the gear shaft 9, are engageable with teeth 21 or 22 on gears 3 or 7, light-weight thrust members 41, arranged between a pair of friction cones 24 and 25 engageable with complementary surfaces on the gears 3 and 7, are slidable axially in channels 42 formed on the member 12 and are urged outwardly by spring-pressed balls 46 so as normally to engage spherical projections 44 with an annular groove 45 in the member 14. The cones 24 and 25 have lost-motion rotary connections with the member 12 by means of projections 29 on the cones engaging enlarged apertures in the member 12. and are provided with teeth 33 and 34, the adjacent ends of the teeth 15, 33 and 34 being chamfered. As the member 14 is moved, say, to the left, the members 41 are carried along therewith to thrust the friction cone 24 into engagement, the resulting relative movement between the members 12 and 24 then preventing further movement of the member 14 until synchronism is attained, whereupon the teeth 15 can pass through the teeth 33 into engagement with the teeth 21 after the yielding connection between the members 41 and the member 14 has been broken. In one modification, conical helical springs are used instead of the spring-pressed balls 46, while in other modifications resilient bowed thrust members have central cylindrical projections or depressions engageable with an annular groove in the member 14 or with cylindrical projections formed on straps secured in the member 14. Alternatively, the resilient or spring-urged thrust members may engage with the member 14 solely by friction, as shown in Figs. 11 and 13, wherein the teeth 33 and 34 are replaced by lugs 33a and 34a having chamfered ends co-operating with the inclined end walls 36a of recesses formed in the member 14 to provide both the balking effect and the lost-motion connections of the members 24 and 25 with the member 14. Fig. 16 shows another embodiment wherein the thrust members 41 are secured to the member 14 and their outer ends provide inwardly-biased spring fingers 67. The fingers occupy the position shown when the member 14 has been moved to its right-hand position, so that, on the member 14 being moved to the left, the left-hand finger thrusts the cone 24 into engagement and, when balking ceases upon the attainment of synchronism, the fingers ride over the lugs 33a and 34a. As shown in Figs. 17 and 19, each thrust member 41, which is located in a channel in the member 12 and is urged outwards by a spring or by a rubber cushion 147 so as normally to engage a ball 145, carried in a conical depression in the member 41, with an annular groove in the member 14, has inwardlyturned flanges 142 at its ends engaging in enlarged radial grooves 143 in the members 24 and 25 so as to provide the lost-motion connections of the latter with the member 12.