Patent GB-425655-A (GB)
Title: Automatically operating locking devices for liquid medium power transmission devices
IPC: F16H61/60
Filed: 1934-05-18
Abstract: 425,655. Hydraulic and free-wheel clutches. KLEIN, SCHANZLIN, & BECKER AKT.-GES., Frankenthal, Germany. May 18, 1934, Nos. 15089 and 15090. Convention dates, May 18, 1933 and July 14, 1933. [Class 80 (ii)] [See also Group XXIX] In an hydraulic transmission clutch embodying an auxiliary guide blade wheel, locking elements, which co-operate with a fixed member and with the driven turbine element respectively and which are so interconnected that only one can be operative at any one time, are so carried by a member connected to the auxiliary wheel that the latter becomes connected to the driven element or to the fixed member when it tends to over-run the driven element or to reverse, respectively, while reverse rotation of the driven element can occur. As shown in Fig. 1, a ring 4 connected to the auxiliary wheel carries two sets of pivoted pawls 5 and 6 co-operating with ratchet teeth 2 and 3 on the driven shaft 1 and on the fixed casing respectively, the two sets being interconnected by links 7. The ends of arms 8, 9 turning with the pawls coact with friction rings 11, 13 carried on the shaft 1 and casing, in such a way that when the ring 4 tends to overrun the shaft 1 the pawls 5 engage the teeth 2 and when the ring 4 tends to reverse the pawls 6 engage the teeth 3, while when the speed of the ring 4 is less than that of the shaft 1 the pawls are maintained in an intermediate disengaged position. Alternatively, a single set of doubleacting pawls may be employed, with arms in constant frictional engagement with the shaft 1. No intermediate position is possible in this case, but the arrangements may be modified to give an intermediate position. The pawls may be replaced by inter-connected sets of wedging rollers 24, 25, Fig. 4, arranged in cam recesses 26, 27 in the ring 4 and cooperating with the cylindrical surfaces of a ring 28 secured to the shaft 1 and of the casing, the inner rollers 24 being frictionally engaged by spring-pressed rings 30 carried by the shaft 1. If an intermediate position is desired, the outer rollers are also engaged by similar rings carried by the casing. The connecting links 34 may be guided by studs 36, 37. In these constructions, the locking elements of each set may be caused to move in unison by means of a ring having a pin-and-slot connection with each element of the set ; or where two sets are employed a single ring may be used to interconnect all the elements, in which case the connecting links 7 or 34 are unnecessary. As shown in Fig. 6, a member 38, mounted through a quick-pitch thread 54 on a member 41 connected to the auxiliary wheel, has end claws 39 and 40 adapted to engage with claws 42 and 43 formed on a member 48 secured to the shaft 1 and on a fixed member 49 respectively. The member 38 carries spring-pressed friction discs 46, 47 co-operating with the members 48, 49. The front faces of the claws are bevelled, and stops 64, 65 limit the axial movements of the member 41. In a modification, spring- pressed friction discs, which may be conical, are carried by the members 48, 49 to co-operate with the member 38. In a modified construction, the member 38 carries a split friction ring 68, Fig. 8, which is pressed outwards by springs into contact with drums 72, 73 carried by the members 48, 49.