| 摘要 |
1,112,164. Friction clutches; change-speed controL HOOVER Ltd. (Hoover Co.) 28 Nov., 1966 [1 Dec., 1965], No. 51018/.65. Headings F2C and F2D. [Also in Division D1]. An electric motor drive for driving part of a washing-machine at widely differing speeds.comprise a pole-changing motor 10 having a pulley 12 or the like rotatably mounted on its shaft 15 and selectively connected thereto.through a lowratio transmission including a friction clutch and through a direct drive clutch, a centrifugal device being provided for engaging the direct drive clutch and disengaging the low-speed clutch when the motor speed exceeds a predetermined value and vice versa. The shaft 15 of the 4-2pole changing motor 10 carries the gear unit, the reduction gear comprising 7: 1 belt or :gear drive to a low-speed clutch disc 16 mounted on ball-bearing 17 carried on the shaft. Between bearing 17 and the motor, the shaft carries a pulley 18 driving through toothed belt 19, a large pulley 20 on a lay shaft 21 carried by the motor casing., Integral with pulley 20 is a pulley 22 which through toothed belt 23 drives a large pulley 24 integral with clutch disc 16. Output V-pulley 1-2 is axially slidable on the shaft and is rotatable on ball-bearing 25 and is biased away from the motor by a light coilspring 26. Beyond bearings 25 on shaft 15 is a freely slidable operating cone 27 and at its end shaft 15 carries a apider28 carrying pivots'29 at diametrically opposed points each carrying a clutch shoe 30 pivoted at one end and urged inwards by a powerful spring at its other end which carries a wedge 33 to engage cono 27 and push pulley 12'towards the motor. Pulley 12 has a clutch face 35 which engages a lining 36 on the low-speed clutch member 16 when wedges 33 force wheel 12 towards the motor. A drum 37 on wheel 12 surrounds the shoes 30 of clutch 28 and these are forced outwards by centrifugal force against the action of the springs when the motor rotates rapidly. In another arrangement, Fig. 2, gears 45 are carried on lay shafts 21 on motor casing 10 and mesh with a pinion 46 on motor shaft 15. Integral with each pinion 45 is a pinion 47 meshing with a gear 48 carried by a low speed driving sleeve 50>having bearings 51 at its end adjacent the motor and a low-speed clutch disc 52 with a clutch cone 53. A direct drive clutch disc 55 on the end of shaft 15 has a clutch face 56. Between discs 52 and 53 is a member 60 comprising a hub 61 connected by a web 62 to a ring 63 having a conical surface with linings 64, 65 to engage surface 53 and clutch face 56 respectively. An axially movable freely rotatable spider 67 on bearing 66 on hub 61 carries, on lugs 73 extending through disc 55, L-shaped weights 68 each with a short hub 69 overlying the outer face of disc 55 and a long limb 70 weighted at the end and extending towards the motor through a hole 71 in disc 55. Rotation of disc 55 causes the weighted limbs 70 of the weights to fly outwards so that ends 69 engage disc 55 and draw member 60 towards disc 55 so that, during high-speed rotation, lining 65 engages face 56. Powerful compression springs surrounding pins 74 aligning spider 67 and disc 55 force spider 67 towards-the motor so that, during low-speed rotation when there is insufficient centrifugal force, surface 64 engages surface 53. Output member 60 has radially projecting lugs 79 which drive an output member 80 comprising a shell 81, 82 and a driving pulley 83 for a belt. Shell 80,is connected to clutch member 60 through pins 86 surrounded by springs 87 to hold hub 84 against a shoulder 88 on sleeve 50. |
