GB639843A - Improvements in and relating to toothed gearing - Google Patents

Abstract

639,843. Toothed gearing. KIRSTEN, K. F. J. April 2, 1947, No. 8996. Convention date, April 7, 1945. [Class 80 (i)] In a toothed gear pair between shafts disposed other than in line, one gear is in unequal portions interconnected by force balancing means so as to equalize the tooth pressures therebetween. As shown, mutually rigid sections 10, 11, Fig. 2, of a herring-bone bevel pinion mesh respectively bevel rings 21, 22 rotatably. mounted in a main gear frame 2 and connected thereto and mutually interconnected by levers 3, Fig. 1, pivoted in the frame 2 and slidably engaging journal blocks 31, 32 mounted in the rings 21, 22. Each lever 3 is made of sufficient strength to transmit the entire load, and the radial positions of the fulcra 30 are located so that the levers are in balance when the unitary tooth pressures on the rings 21, 22 are equal. Formulµ for calculating the radial location of the fulcra, both when the journal blocks 31, 32 are situated symmetrically and asymmetrically radially with regard to the rings 21, 22, are given. The axial extent of the sections 10, 11 is preferably one quarter of the height of their respective pitch cones, and to balance out axial thrusts the helix angle of the section 11 may be greater than that of the section 10. In a modification, three pinion sections are used gearing with rotatably mounted rings 21, 4, 22, Fig. 6, balanced by a chinese lever system. A lever 45, the ends of which are received in journal blocks 32, 46 mounted in the rings 22, 4, carries a fulcrum boss 44 mounting a journal block 43 receiving one end of a lever 3 which is fulcrummed in the gear frame 2 and the remote end of which is received in a journal block 31 in the ring 21. The invention is applicable to straight-toothed bevel gearing.