Traction assembly, particularly for terrestrial traction machines and the like

Patent metadata

Field	Value
Publication number	US-11718282-B2
Application number	US-202016897005-A
Country	US
Kind code	B2
Filing date	Jun 9, 2020
Priority date	Jun 11, 2019
Publication date	Aug 8, 2023
Grant date	Aug 8, 2023

Abstract

A traction assembly for terrestrial traction machines, which includes at least one gearmotor adapted to be associated with a track or wheel of the terrestrial traction machine, and a parking brake of an electromagnetic type which is associated with the gearmotor, and wherein the parking brake is of a multi-dry-disk type and is interposed between the driving component of the gearmotor and a speed limiter of the gearmotor.

First claim

The invention claimed is:

1. A traction assembly for terrestrial traction machines, which comprises:
at least one gearmotor and a track or wheel, and
an electromagnetic and multi-dry-disk parking brake interposed between a driving component of said at least one gearmotor and a speed limiter of said at least one gearmotor, wherein said parking brake comprises:
a closure flange and an outer casing;
a pack of friction disks fitted over an input coupling of the speed limiter;
a moving anchor movable along a direction parallel to a rotation axis of a driving shaft between a braking position and a neutral position,
in the braking position, said moving anchor pressed into contact with said pack of friction disks by elastic means positioned between the moving anchor and the closure flange, and
in the neutral position, an electromagnet urges the moving anchor away from said pack of friction disks and opposes thrust exerted by said elastic means; and

a screw and a threaded hole adapted to release said moving anchor from said braking position to said neutral position, the threaded hole positioned on the moving anchor and radially inside of a coil of the electromagnet, the screw passing through said closure flange; said screw having a head arranged on an opposite side of the closure flange of said moving anchor, the screw engaging with said moving anchor to attract the moving anchor in the direction of said head and away from said friction disks to release the friction disks from a locked position.

2. The traction assembly according to claim 1 , wherein the outer casing is associated with the input coupling of said speed limiter and is substantially bell-shaped, and
the closure flange is associated with said outer casing at its wider base and is capable of being integrally associated with supporting structure of said terrestrial traction machine in such a way that it is stationary with respect to the rotation of the driving shaft; said outer casing and said closure flange being coaxially fitted over said input coupling via two mutually opposite central holes which are defined, respectively, on said outer casing and on said closure flange; said outer casing and said closure flange being associated with said input coupling by way of watertight means in such a way as to define a watertight chamber for accommodating the pack of friction disks; the pack of friction disks comprising first disks and second disks which are mutually alternated with each other and are integral in rotation, respectively, with said input coupling and with said outer casing, said disks of said pack of friction disks being interposed between a spacer, which is integral with said outer casing, and the moving anchor, which is integral with said closure flange which in turn is connected to said outer casing, the moving anchor movable via the elastic means interposed between said moving anchor and said closure flange and activation or deactivation of the electromagnet associated with said closure flange,
wherein in the braking position the electromagnet is deactivated.

3. The traction assembly according to claim 2 , wherein said moving anchor is slideably associated with said closure flange by way of a plurality of pins which protrude from said closure flange in the direction of said outer casing along a direction parallel to said rotation axis.

4. The traction assembly according to claim 2 , wherein said elastic means comprise a plurality of helical springs which are interposed between said moving anchor and said closure flange and are oriented in a direction which is substantially parallel to said rotation axis, said helical springs being at least partially accommodated in adapted seats which are defined on the face of said closure flange that faces the direction of said moving anchor.

5. The traction assembly according to claim 2 , wherein said watertight means comprise a gasket interposed between the inner surface of said outer casing and the outer surface of said input coupling.

6. The traction assembly according to claim 2 , wherein said means for generating electromagnetic fields comprise a toroidal solenoid which is associated with said closure flange and has a central axis which coincides substantially with said rotation axis.

7. The traction assembly according to claim 2 , wherein said first disks are slideably associated with said outer casing by way of male/female shape mating, said male/female shape mating being of the type with lobes, and said first disks are of the smooth type.

8. The traction assembly according to claim 2 , wherein said second disks are slideably associated with said input coupling by way of male/female shape mating, said male/female shape mating being of the type with grooved profiles, and said second disks are of the sintered type.

9. The traction assembly according to claim 1 , wherein the head is engaged by manual tools to screw the screw into said moving anchor and release the friction disks from the locked position or unscrew the screw from said moving anchor and allow the elastic means to urge the moving anchor toward the friction disks.

10. The traction assembly according to claim 1 , wherein said speed limiter is of a planetary gear type.

11. The traction assembly according to claim 10 , wherein an outer ring gear of said speed limiter of the planetary gear type defines a drive wheel of said terrestrial traction machine.

12. The traction assembly according to claim 11 , wherein said terrestrial traction machine is a tracked vehicle.

13. A traction assembly comprising:
a gearmotor having an input shaft rotatable about an axis of rotation of a track or wheel of a terrestrial traction machine;
a parking brake with an outer casing that extends along the axis of rotation into a drive wheel of the track or wheel and a closure flange attached to one another and adapted to attach to a non-rotating structure of the terrestrial traction machine;
an input coupling rotatable along the axis of rotation and configured to receive the input shaft of the gearmotor, the input coupling extending along the axis of rotation into the outer casing that extends into the drive wheel, and the input coupling rotatably connectable via one or more gears to drive the drive wheel;
a pack of friction disks sized and shaped so as to fit over the input coupling; and
a moving anchor slideably movable along the axis of rotation between the pack of friction disks and the closure flange, the moving anchor slideably movable by an electromagnet and elastic means so as to selectably move the moving anchor into contact with the pack of friction disks to lock the friction disks to prevent relative rotation between the input coupling and the outer casing; and
a screw and a threaded hole of the moving anchor, the screw comprising a head arranged on an opposite side of the closure flange from the moving anchor and the screw arranged radially inside of a coil of the electromagnet, and the moving anchor moved away from contact with the friction disks when the screw is in an engaged position.

14. The traction assembly of claim 13 , wherein the pack of friction disks comprises a multi-dry-disk type.

15. The traction assembly of claim 13 , further comprising planetary gears arranged within the drive wheel and rotatably connecting the input coupling to the drive wheel.

16. The traction assembly of claim 14 , wherein the multi-dry-disk type comprises pairs of friction disks, each pair comprising a smooth type and a sintered type.

17. The traction assembly of claim 16 , wherein the movable anchor, when moved axially toward the

Assignees

• Dana Motion Sys Italia Srl

Inventors

• Fiumano Antonio Francesco

Classifications

• B60T13/743 Primary

  with a spring accumulator · CPC title

• B60K1/00

  Arrangement or mounting of electrical propulsion units (B60K7/00 takes precedence; arrangement or mounting of plural diverse prime-movers for mutual or common propulsion B60K6/00) · CPC title

• B60T1/005

  by locking of wheel or transmission rotation · CPC title

• B60T1/065

  employing disc (B60T1/062 takes precedence) · CPC title

• B62D55/00

  Endless track vehicles (steering aspects B62D11/00; {characterised by the driver not being seated B62D51/007}) · CPC title