| 摘要 |
1,272,682. Machining crank pins. M. KOBAYASHI, and T. KOBAYASHI. 16 June, 1969 [20 June, 1968], No. 30421/69. Heading B3T. A portable crank-pin machining apparatus comprises an annular casing 5 in which is located an annular worm-wheel 2 which engages a worm 1 mounted in a housing on the periphery of the casing 5, an annular rotor 17 situated within the worm-wheel and connected thereto by a freely movable link 23, the rotor carrying equally angularly spaced crank-pin supporting elements 27 to 30 and a cutting tool and holders 31, 32. The casing, worm-wheel, and rotor are diametrically separable to facilitate the location of the apparatus on a crank-pin in situ. The support elements 27 and 28 are fixable in an adjustable position and elements 29, 30 are radially movable and biased by springs 48 whereby all support elements are retained in contact with the crank-pin surface during machining. The cutting tool 31 is radially adjustable in its holder to determine the depth of cut. The casing with the worm-wheel and rotor are supported in a frame 49 having members spaced axially and on each side of the casing and which are urged into abutment with opposite facing sides of the crank webs adjacent the crank-pin being machined by a jack 60. The frame carries rotatable lead screws 57 transversely spaced one on each side and extending through the casing and which are secured to the casing by a bolt 59 which engages the lead screw thread. In operation, the rotation of the worm 1 effects rotation of the rotor 17 with the tool 31 around the crank-pin on which the apparatus is assembled and the casing 5 with the tool 31 is traversable along the crank-pin by rotation of the feed screws 57. The latter traversing movement is only necessary in cases where the cutting tool length is less than the length of the crank-pin. |
