| 摘要 |
A pneumatic expander brake/clutch 10 having a first power transmission member as a drum (20, fig 1) with an annular friction surface (24, fig 1) on the outer periphery. Arcuate backing block segments 30 are circumferentially closely spaced and adjacent about the drum friction surface. The backing blocks 32 have brake friction pads 34 on the radially inner surface. An inflatable expander ring 54 surrounds the backing blocks 32 and upon inflation forces the blocks radially inward and the pads against the drum friction surface. Baffles 50, 52 are provided on the end of the backing blocks and extend into the spaces between circumferentially adjacent blocks to form a tortuous path for heat emanating from the drum friction surface in a radially outer direction. The baffles 50, 52 insulate the inflatable expander 54 from heat which permits the drum friction surface to operate at a higher temperature, and power transmission/dissipation without overheating the expander. |
