Motor brake unit

Claim 2

In combination with a motor having a motor enclosure provided with a generally radially disposed mounting end portion and a rotatable drive shaft projecting axially outwardly therefrom, a preassembled brake unit adapted to be surmounted axially onto the drive shaft and be fixedly attached to the mounting end portion of the motor enclosure, the unit comprising: a sleeve member having a bore located at one end adapted to nestingly receive the drive shaft for rotation therewith; a housing structure defining an internal cavity at least partially surrounding said sleeve member, said structure having a first end portion adapted to be moved into confronting relationship with said mounting end portion, said housing structure further having a second end portion axially spaced from said first end portion; separate bearing and seal means interposed between said second end portion and the end of said sleeve opposite said first mentioned end portion thereof for respectively rotatably supporting and sealing said opposite end of said sleeve relative to said housing structure; fastening means extending between said first end portion and said mounting end portion for non-rotatably connecting said structure to the motor; a liquid heat transfer medium at least partially filling said internal cavity; a first plurality of brake elements located in said internal cavity and rotatable with said sleeve member; a second plurality of brake elements located in said internal cAvity and non-rotatably supported by said housing structure; piston means movable axially of said drive shaft and slidably supported by said housing structure proximate said first end thereof for selectively engaging and disengaging said first and second plurality of brake elements; and spring means located between said first end portion and said piston means for normally biasing said piston means in an axial direction to engage said first and second brake elements.

Claim 3

In combination with a motor having a motor enclosure provided with a generally radially disposed mounting end portion and a rotatable drive shaft projecting axially outwardly therefrom, a preassembled brake unit adapted to be surmounted axially onto the drive shaft and be fixedly attached to the mounting end portion of the motor enclosure, the unit comprising: an adapter plate connected to said mounting end portion, a sleeve member having a bore located at one end adapted to nestingly receive the drive shaft for rotation therewith; a housing structure defining an internal cavity at least partially surrounding said sleeve member, said structure having a first end portion adapted to be moved into confronting relationship with said adapter plate, said housing structure further having a second end portion axially spaced from said first end portion; separate bearing and seal means interposed between said second end portion and the end of said sleeve opposite said first mentioned end portion thereof for respectively rotatably supporting and sealing said opposite end of said sleeve relative to said housing structure; fastening means extending between said first end portion and said mounting end portion for non-rotatably connecting said structure to the motor; a liquid heat transfer medium at least partially filling said internal cavity; a first plurality of brake elements located in said internal cavity and rotatable with said sleeve member; a second plurality of brake elements located in said internal cavity and non-rotatably supported by said housing structure; piston means movable axially of said drive shaft and slidably supported by said housing structure proximate said second end thereof for selectively engaging and disengaging said first and second plurality of brake elements; and spring means located between said second end portion of said housing structure and said piston means for normally biasing said piston means in an axial direction to engage said first and second brake elements.

Claim 4

In combination with a motor having a motor enclosure provided with a generally radially disposed mounting end portion and a rotatable drive shaft projecting axially outwardly therefrom, a preassembled brake unit adapted to be surmounted axially onto the drive shaft and be fixedly attached to the mounting end portion of the motor enclosure, the unit comprising: an adapter plate connected to said mounting end portion, a sleeve member having a bore located at one end adapted to nestingly receive the drive shaft for rotation therewith; a housing structure defining an internal cavity at least partially surrounding said sleeve member, said structure having a first end portion adapted to be moved into confronting relationship with said adapter plate, said housing structure further having a second end portion axially spaced from said first end portion; separate bearing and seal means interposed between said second end portion and the end of said sleeve opposite said first mentioned end portion thereof for respectively rotatably supporting and sealing said opposite end of said sleeve relative to said housing structure; fastening means extending between said first end portion and said mounting end portion for non-rotatably connecting said structure to the motor; a liquid heat transfer medium at least partially filling said internal cavity; a first plurality of brake elements located in said internal cavity and rotatable with said sleeve member; a second plurality of brake elements located in said internal cavity and non-rotatably supported by said housing structure; piston means movable axially of said drive shaft and slidably supported by said housing structure proximate said second end thereof for selectively engaging and disengaging said first and second plurality of brake elements; and spring means located between said second end portion of said housing structure and said piston means for normally biasing said piston means in an axial direction to engage said first and second brake elements.

Claim 5

In combination with a motor having a motor enclosure provided with a generally radially disposed mounting end portion and a rotatable drive shaft projecting axially outwardly therefrom, a preassembled brake unit adapted to be surmounted axially onto the drive shaft and be fixedly attached to the mounting end portion of the motor enclosure, the unit comprising: a sleeve member having a bore located at one end adapted to nestingly receive the drive shaft for rotation therewith; a housing structure defining an internal cavity at least partially surrounding said sleeve member, said structure having a first end portion adapted to be moved into confronting relationship with said mounting end portion of said motor enclosure, said housing structure further having a second end portion axially spaced from said first end portion; separate bearing and seal means interposed between said second end portion and the end of said sleeve opposite said first mentioned end portion thereof for respectively rotatably supporting and sealing said opposite end of said sleeve relative to said housing structure; fastening means extending between said first end portion and said mounting end portion for non-rotatably connecting said structure to the motor; a liquid heat transfer medium at least partially filling said internal cavity; a first plurality of brake elements located in said internal cavity and rotatable with said sleeve member; a second plurality of brake elements located in said internal cavity and nonrotatably supported by said housing structure; and actuatIng means for selectively engaging and disengaging said first and second plurality of brake elements, said actuating means including fluid actuable piston means movable axially of said drive shaft, and spring means for normally biasing said piston means in an axial direction to engage said first and second plurality of brake elements.

Claim 6

In combination with a motor having a motor enclosure provided with a generally radially disposed mounting end portion and a rotatable drive shaft projecting axially outwardly therefrom, a preassembled brake unit adapted to be surmounted axially onto the drive shaft and be fixedly attached to the mounting end portion of the motor enclosure, the unit comprising: a sleeve member having a bore located at one end adapted to nestingly receive the drive shaft for rotation therewith; a housing structure defining an internal cavity at least partially surrounding said sleeve member, said structure having a first end portion adapted to be moved into confronting relationship with said mounting end portion of said motor enclosure, said housing structure further having a second end portion axially spaced from said first end portion; separate bearing and seal means interposed between said second end portion and the end of said sleeve opposite said first mentioned end portion thereof for respectively rotatably supporting and sealing said opposite end of said sleeve relative to said housing structure; fastening means extending between said first end portion and said mounting end portion for non-rotatably connecting said structure to the motor; a liquid heat transfer medium at least partially filling said internal cavity; a first plurality of brake elements located in said internal cavity and rotatable with said sleeve member; a second plurality of brake elements located in said internal cavity and nonrotatably supported by said housing structure; and actuatIng means for selectively engaging and disengaging said first and second plurality of brake elements, said actuating means including fluid actuable piston means movable axially of said drive shaft, and spring means for normally biasing said piston means in an axial direction to engage said first and second plurality of brake elements.

Claim 7

The combination as set forth in claim 1 wherein said piston means is air-pressure actuated.

Claim 8

The combination as set forth in claim 1 wherein said brake elements are at least partially submerged in said fluid heat transfer medium.

Claim 9

The combination as set forth in claim 3 which includes fluid passage defining means for communicating cooling fluid around said pluralities of brake elements for transferring heat to the exterior of said housing structure.

Claim 10

The combination as set forth in claim 3 wherein said brake unit is completely sealed to the atmosphere to prevent the ingress of dirt, dust and the like into said housing structure thereof.

Claim 11

The combination as set forth in claim 3 wherein said fluid heat transfer medium is sheared by selectively engaging and disengaging said first and second plurality of brake elements.