| 摘要 |
1,183,557. Bearings; clutch-brake combinations. SINGER CO. 21 May, 1968 [25 May, 1967], No. 24072/68. Headings F2A and F2L. Bearings.-A shaft 32 (Fig. 2) is supported by a pair of tapered roller bearings 130 and 132 in a housing 20. The outer race of one of the bearings 130 is fixed axially in the housing while the other outer race is slidable axially. A sleeve 170 disposed about the shaft positions the inner races axially relative to each other, and a nut 172 clamps the inner races in position on the shaft. A spring 164 abutting a plate 160 in the housing biases the member 154 against the slidable outer race 132 thereby loading the tapered roller bearings. An 0-ring 176 located in a recess in the nut 172 forms a seal between the shaft and the nut. and lubricant seals 148 and 180 are also provided at each end of the tapered roller bearing assembly. The tapered roller bearing is applied to supporting the rotor of an electric motor in its casing. The spindle 52 ofthe motor 10 is supported in the casing by a roller bearing 44 and in the rotor by a roller bearing 56, both bearings allowing limited axial movement of the spindle. Clutch-brake combinations.-The driven shaft 52 of the motor 10 has at one end a hub 64 and the inner race of a ball bearing 66 secured to it by means of a nut 68. The outer race of the ball bearing is attached to a plate 70 by means of screws 74. A lever 82 pivots about a pin 84 the position of which may be varied by means of the assembly 76, 78 and 80. A block 88 is pivotally connected to the lever by means of a pin 90 and may slide in a recess formed in the plate 70. A spring 94 abuts the housing of the motor and is secured to the lever 82 by means of an adjusting screw 96. The movement of the lever in an anticlockwise direction is limited by an adjustable screw 100 and in a clockwise direction by a latch 104 abutting an adjustable screw 114. A clutch disc 120 is secured to the hub 64 by screws 116 and carries a friction clutch facing 122 and a friction brake facing 124. When the lever is actuated by movement of the rod 126 a thrust is transmitted via the bearing 66 to the shaft 52 moving it axially. The clutch surface 122 may engage with the rotor 30 of the motor or the brake surface 124 may engage with the inner surface of the end casing 16 of the motor. |
