| 摘要 |
On this drive unit (1) a traction sheave (7) or, more specifically, the end of a drive shaft (3) is supported by a second bearing (8) which is mounted on an extension (9) of a second bearing plate (2.2). The traction sheave (7) has an extension which serves as a brake drum (11) Mounted between the traction sheave (7) and casing (2), the brake drum (11) together with first brake arms (12), second brake arms (13), first electromagnets (14), second electromagnets (15), first compression springs (16) and second compression springs forms the braking device of the drive unit. On top of the second bearing plate (2.2) is a first arm linkage (17) and at the bottom of the second bearing plate (2.2) is a second arm linkage (18). The force of the first compression spring (16) is transmitted to the brake drum (11) by means of the first brake arm (12), the required friction force on the brake drum (11) being generated by a first brake lining (20) mounted on a first brake shoe (19). The friction force on the second half of the brake is generated analogously. To release the brake the electromagnets (14, 15) are activated, these overcoming the forces of the compression springs and lifting the brake shoes (19, 21) together with the brake linings (20, 22) off brake drum (11).
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