Drive train with thermal overload safeguard

Patent metadata

Field	Value
Publication number	US-11378137-B2
Application number	US-201916666725-A
Country	US
Kind code	B2
Filing date	Oct 29, 2019
Priority date	May 22, 2017
Publication date	Jul 5, 2022
Grant date	Jul 5, 2022

Abstract

A drive train includes a drive element, an output element and a thermal overload safeguard. The thermal overload safeguard is configured in such a way that there is a connection between the drive element and the output element below a critical temperature, and the drive element and the output element are decoupled mechanically from one another above the critical temperature.

First claim

What is claimed is:

1. A drive train, comprising:
a drive input element;
a drive output element; and
a thermal overload safeguard, wherein
the thermal overload safeguard is configured such that there is a connection between the drive input element and the drive output element below a critical temperature, and the drive input element and the drive output element are mutually mechanically decoupled above the critical temperature,
wherein the thermal overload safeguard comprises at least one thermal securing element further comprising at least one pin, the at least one pin comprising a notch configured as a predetermined breaking point of the pin.

2. The drive train according to claim 1 , wherein
the overload safeguard is a thermal coupling which is disposed between the drive input element and the drive output element.

3. The drive train according to claim 1 , wherein
the thermal securing element varies the mechanical properties thereof above the critical temperature.

4. The drive train according to claim 1 , wherein
the at least one pin melts above the critical temperature.

5. The drive train according to claim 1 , wherein
the at least one pin breaks at the predetermined breaking point above the critical temperature and a predefined force.

6. The drive train according to claim 1 , wherein
a volume of the thermal securing element decreases above the critical temperature.

7. The drive train according to claim 1 , wherein
a torque flow in the drive train is mechanically interrupted above the critical temperature.

8. The drive train according to claim 1 , wherein
the drive input element is configured as a shaft and the drive output element is configured as a hub.

9. The drive train according to claim 1 , wherein
the at least one pin is configured to break at the predetermined breaking point in response to a first predefined force applied to the at least one pin below the critical temperature,
the at least one pin is configured to break at the predetermined breaking point in response to a second predefined force applied to the at least one pin above the critical temperature, and
wherein the first predefined force is greater than the second predefined force.

10. The drive train according to claim 1 , wherein
the drive input element comprises a first bore,
the drive output element comprises a second bore, and
wherein the at least one pin is disposed in both the first bore and the second bore.

11. The drive train according to claim 10 , further comprising
a first hardened sleeve disposed in the first bore and surrounding a first end of the at least one pin on a first side of the notch; and
a second hardened sleeve disposed in the second bore and surrounding a second end of the at least one pin on a second side of the notch.

12. The drive train according to claim 1 , wherein
the notch is located at a position between the drive input element and the drive output element.

13. The drive train according to claim 1 , wherein
the drive input element comprises a first flanged hub, and
the drive output element comprises a second flanged hub.

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Brk Nikola

Classifications

• F16B31/021

  by means of a frangible part (F16B31/025, F16B31/028 take precedence; break members in torque limiters or torque indicators in wrenches or screwdrivers B25B23/1415) · CPC title

• F16D9/06

  by breaking due to shear stress · CPC title

• F16D9/02 Primary

  by thermal means, e.g. melting member · CPC title