Universal joint of small caliber tube propulsion machine

摘要

(57) Abstract Objective When it decreases the surface pressure of the torque transmission aspect, simultaneously,There are times when relief of concentration of stress is assured. Constitution Is provided in the Tip of the lead tube the cutter head which diggingThe earth and sand , providing to the small caliber inside of pipe which follows to the lead tubeThe small caliber which it tries to carry out it is due to the screw conveyerIn the tube propulsion machine, the screw of the above-mentioned screw conveyeru axis the universal joint which joints between 1 and 2,The screw axis in the destal of 1 which is and it should joint and 2 in circumferential directionThe fit section which possesses thread portion 1b, 2b and trough 1c and 2c alternatelyTo form 1a and 2a, at the same time these thread portions 1b, 2b and the troughAs 1c and 2c are fit mutually, each fit section 1a, 2The Interpolation passing through reaction force receiving axis 5 to the center of a, this reaction force receiving axisThrough 5, way each screw axis you joint between 1 and 2, structureBeing something which it forms, the thread portion 1b which torque transmission fits mutually,Because it is done between 2b and trough 1c and 2c by surface contact,Stress concentrating on the surface pressure decrease and the trough of the torque transmission aspectIt is possible to ease.