Mechanical brake

Patent metadata

Field	Value
Publication number	US-12017894-B2
Application number	US-202117200395-A
Country	US
Kind code	B2
Filing date	Mar 12, 2021
Priority date	Mar 12, 2021
Publication date	Jun 25, 2024
Grant date	Jun 25, 2024

Abstract

A brake or a clutch includes a central shaft, an output-side threaded driver, an output brake plate, an input brake plate, and an input-side threaded driver. The output-side threaded driver and the input-side threaded driver are rotationally locked to the central shaft, such as by splines. The output-side threaded driver is threaded to the output brake plate and the input-side threaded driver is threaded to the input brake plate. The output brake plate is threaded to the input brake plate in a direction opposite the threaded engagement of the drivers to the brake plates. The brake or clutch may include two stator plates and three friction discs located between the output brake plate and the input brake plate.

First claim

The invention claimed is:

1. A system, comprising:
a central shaft to be coupled to a source of mechanical power;
an input brake plate;
an output brake plate coupled to a mechanical device to be powered by the source of mechanical power; and
a stator plate located between the input brake plate and the output brake plate;
wherein when the source of mechanical power applies a first input torque to the central shaft, the first input torque is transmitted from the central shaft through the output brake plate to the mechanical device and drives operation of the mechanical device in a forward direction;
wherein when the source of mechanical power applies a second input torque to the central shaft, the second input torque is transmitted from the central shaft to the input brake plate to allow operation of the mechanical device in a reverse direction; and
wherein when the source of mechanical power does not apply a torque to the central shaft and the mechanical device is biased toward the reverse direction, the mechanical device applies a third input torque to the output brake plate, the stator plate is compressed between the input brake plate and the output brake plate, and compression of the stator plate between the input brake plate and the output brake plate prevents rotation of the output brake plate.

2. The system of claim 1 wherein the system is a brake.

3. The system of claim 1 wherein the system is a clutch.

4. The system of claim 1 wherein the mechanical device is a winch.

5. The system of claim 1 wherein the mechanical device is a hoist.

6. The system of claim 1 wherein the system does not include a ratchet.

7. The system of claim 1 wherein when the source of mechanical power applies the first input torque to the central shaft, compression of the stator plate between the input brake plate and the output brake plate is reduced.

8. The system of claim 1 wherein when the source of mechanical power applies the second input torque to the central shaft, compression of the stator plate between the input brake plate and the output brake plate is controlled to allow operation of the mechanical device in the reverse direction.

9. The system of claim 1 wherein when the source of mechanical power does not apply a torque to the central shaft and the mechanical device is biased toward the forward direction, the mechanical device applies a fourth input torque to the output brake plate that drives rotation of the output brake plate, the central shaft, and the input brake plate.

10. A system, comprising:
a central shaft to be coupled to a source of mechanical power;
an input-side driver coupled to an input end portion of the central shaft;
an input brake plate coupled to the input-side driver;
an output-side driver coupled to an output end portion of the central shaft;
an output brake plate coupled to the output-side driver, to the input brake plate, and to a mechanical device to be powered by the source of mechanical power; and
a stator plate located between the input brake plate and the output brake plate;
wherein when the source of mechanical power applies a first input torque to the central shaft, the first input torque is transmitted from the central shaft to the output-side driver, through the output-side driver to the output brake plate, and through the output brake plate to the mechanical device to drive operation of the mechanical device in a forward direction;
wherein when the source of mechanical power applies a second input torque to the central shaft, the second input torque is transmitted from the central shaft to the input-side driver and through the input-side driver to the input brake plate to allow operation of the mechanical device in a reverse direction; and
wherein when the source of mechanical power does not apply a torque to the central shaft and the mechanical device is biased toward the reverse direction, the mechanical device applies a third input torque to the output brake plate, the stator plate is compressed between the input brake plate and the output brake plate, and compression of the stator plate between the input brake plate and the output brake plate prevents rotation of the output brake plate.

11. The system of claim 10 wherein the input-side driver is rotationally locked to the input end portion of the central shaft.

12. The system of claim 10 wherein the output-side driver is rotationally locked to the output end portion of the central shaft.

13. The system of claim 10 wherein the output brake plate is threaded to the output-side driver.

14. The system of claim 13 wherein the input brake plate is threaded to the input-side driver.

15. The system of claim 14 wherein a first handedness of a first threaded engagement of the output brake plate to the output-side driver matches a second handedness of a second threaded engagement of the input brake plate to the input-side driver.

16. The system of claim 15 wherein the output brake plate is threaded to the input brake plate and a third handedness of a third threaded engagement of the output brake plate to the input brake plate is opposite to the first handedness and the second handedness.

17. The system of claim 10 , wherein the stator plate is a first stator plate and the system further comprises:
a second stator plate located between the input brake plate and the output brake plate;
a first friction disc located between the input brake plate and the first stator plate;
a second friction disc located between the first stator plate and the second stator plate; and
a third friction disc located between the second stator plate and the output brake plate.

18. A method of operating a system including a central shaft, an input brake plate, an output brake plate coupled to a mechanical device, and a stator plate located between the input brake plate and the output brake plate, the method comprising:
applying a forward input torque to the central shaft;
transmitting the forward input torque from the central shaft through the output brake plate to the mechanical device, thereby driving forward operation of the mechanical device;
removing the forward input torque from the central shaft, thereby allowing the mechanical device to bias the output brake plate in a reverse direction, thereby causing the stator plate to be compressed between the input brake plate and the output brake plate, thereby preventing rotation of the output brake plate;
applying a reverse input torque to the central shaft; and
transmitting the reverse input torque from the central shaft to the input brake plate to allow operation of the mechanical device in reverse.

19. The method of claim 18 wherein applying the forward input torque to the central shaft reduces compression of the stator plate between the input brake plate and the output brake plate and applying the reverse input torque to the central shaft controls compression of the stator plate between the input brake plate and the output brake plate to allow operation of the mechanical device in reverse.

20. The method of claim 18 , further comprising operating the mechanical device to bias the output brake plate in a forward direction, thereby driving rotation of the output brake plate, the central shaft, and the input brake plate.

Assignees

• Paccar Inc

Inventors

• Miller Jonathan
• Conley Jacob

Classifications

• F16D43/213

  with axially applied torque-limiting friction surfaces · CPC title

• F16D13/38

  with flat clutching surfaces, e.g. discs · CPC title

• B66D5/14 Primary

  embodying discs · CPC title

• B66D1/58

  responsive to excess of load · CPC title

• B66D2700/03

  Mechanisms with latches or braking devices in general for capstans, hoists or similar devices as well as braking devices actuated electrically or by fluid under pressure · CPC title