Patent GB-874248-A (GB)
Title: Improvements in or relating to tool stone expander units for honing machines
IPC: B24B33/10
Filed: 1959-01-20
Abstract: 874,248. Honing. FULMER, C. A. Jan. 20, 1959, No. 2104/59. Class 60. A tool stone expander unit, for honing machines having a tool-carrying spindle mounted on the base thereof for concurrent reciprocating and rotating movements relative to a fixed work piece, comprises a main drive member fixed to the spindle and having a driving connection with the tool, a reciprocated housing for the unit having the main drive member rotatably mounted therewithin against axial displacement, a main drive gear rotatably mounted on the main drive member, a mechanical connection between the main drive gear and the tool for expanding the abrading stones thereof, a planet cage encircling the main drive member, first and second sets of planet gears mounted for rotation in the cage and operable respectively by the main drive member and by the housing, a reversible motor mounted on the housing, a first train of gears connecting the motor to the first set of planet gears and a second train of gears connecting the second set of planet gears to the main drive gear. A machine for honing a cylindrical bore in a workpiece 27 has a spindle 8 rotated by a motor 9 and reciprocated hydraulically. A housing comprises upper and lower sections 34, 35 secured together by bolts ; the upper section has a laterally extending portion 37 carrying a wheel 38 movable in a guide track 39 bolted to the machine frame 6, so as to prevent rotation of the housing while permitting it to reciprocate. A main drive member journalled by thrust bearings 31, 32 within the housing comprises upper and lower sleeves 40, 41 having flanges 42, 43 secured together by bolts. The upper sleeve 40 is formed with a spindle connection 45 received in a socket 46 in the lower end 29 of the spindle 8 and held therein by a key 47. The lower sleeve 41 has ears 48, 48 between which is pivotally mounted a drive block 49 of a universal joint ; a socket member 50 has ears 51, 51 pivotally mounted to the block. The upper end of a hollow extension shank 60 of the honing tool body has a head 61 fitting within the socket member 50, the head having pins 62 receivable in bayonet slots 63 in the socket member. The radial position of the honing stones of the tool is controlled by cones 56 which are moved towards or away from each other by rotating a rod 57. The upper end of the control rod 57 has a square shank 64 removably received in a tube 65 journalled by bearing 66 in the lower sleeve 41. A gear 67 keyed on the upper end of the tube 65 meshes with pinions 69 having stub shafts 70, 71 journalled in the flanges 42, 43. Secured to each stub shaft 70 is a gear 72. The upper sleeve 40 is encircled by a planet cage comprising rings 75, 76 secured together by blocks 77 between the rings ; two sets of planet gears 80, 81 alternate with the blocks 77 adjacent gears of each set being independently journalled on a bearing shaft 82 anchored at its ends in the rings. The first set of planet gears 80 all mesh with an external ring gear 83 keyed on the upper sleeve 40. The second set of planet gears 81 all mesh with an internal ring gear 85 secured to the upper housing section 34 by a pin 86 and with a gear 185 rotatably mounted on the upper sleeve 40. The gear 185 meshes with the gears 72. A ring gear 87 encircling the planet gears 80 and meshing with them also meshes with an idler 90 journalled on a bolt 91 which fixes a motor support plate 92 to the underside of the housing extension 37. The idler meshes with a drive gear 93 on the shaft of reversible fluid motor. 95. Mounted on the plate 92. The tool is expanded or contracted during its rotation and. reciprocation by operating the motor in the. appropriate direction. Operation of the motor may be either controlled manually or by an automatic pressure fluid system that will intermittently or continuously expand the tool under a predetermined torque and be automatically shut off at the end of the work period.