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Compliant non-jamming end of travel stop for a ball screw actuator and method of absorbing energy in the actuator

A stopper and ball screw technology, applied in the direction of transmission, belt/chain/gear, mechanical equipment, etc., can solve problems such as ball screw or gearbox damage, EMA damage, etc.

Inactive Publication Date: 2011-04-27
HAMILTON SUNDSTRAND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a traveling actuator hits the end of its travel stop, the moment of inertia of the motor will tend to cause the actuator to continue driving past the end stop, causing significant damage to the EMA
If the end stops are strong enough to maintain their integrity, the next weakest link, typically the ball screw or gearbox, can be compromised

Method used

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  • Compliant non-jamming end of travel stop for a ball screw actuator and method of absorbing energy in the actuator
  • Compliant non-jamming end of travel stop for a ball screw actuator and method of absorbing energy in the actuator
  • Compliant non-jamming end of travel stop for a ball screw actuator and method of absorbing energy in the actuator

Examples

Experimental program
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Embodiment Construction

[0013] figure 1 A linear actuator system 10 is shown. System 10 includes an electromechanical actuator 12 interconnected between a first member 14 and a second member 16 . The actuator 12 extends and retracts, thereby moving the first member 14 and the second member 16 relative to each other.

[0014] The actuator 12 includes a housing 19 providing a first end 18 connected to the first member 14 . The second end 20 is supported for translation by the housing 19 and is connected to the second member 16 . Motor 20 and gearbox 24 are supported on housing 19 . In the example shown, a brake 26 is also supported by the housing 19 and is intended to cooperate with the gearbox 24 during operation of the actuator 12 .

[0015] refer to figure 2 and image 3 , the actuator 12 includes a sleeve 30 supporting an end 32 providing the second end 20 . The sleeve 30 is received in a bore in the housing 19 (in figure 1 and Figure 4 shown) so as to translate linearly relative to hous...

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Abstract

A linear actuator includes a first structure having an axis. A second structure is configured to translate relative to the first structure in response to rotation of the first structure. First and second stops are respectively operatively connected to the first and second structures. The first and second stops are configured to engage with one another at a travel limiting position. A compliant member is operatively arranged between the first and second structures and is configured to absorb energy between the first and second structures in the travel limiting position.

Description

technical field [0001] The present invention relates to a ball screw actuator, and more particularly to an electromechanical actuator for aerospace applications. Background technique [0002] One type of electromechanical actuator (EMA) uses a ball screw driven by an electric motor, and optionally through a gearbox. The moment of inertia imposed by the motor on the ball screw can be problematic when designing small high power density EMAs. A large motor will generate a significant amount of moment of inertia. When using a gearbox, the motor inertia imparted to the ball screw is proportional to the square of the motor inertia multiplied by the gear reduction ratio. [0003] Motor inertia is important when dimensioning gear trains, ball screws, and / or support structures. Typical EMAs include one or more end stops to limit actuator travel at fully retracted and / or fully extended positions. If a traveling actuator hits the end of its travel stop, the moment of inertia of the...

Claims

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Application Information

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IPC IPC(8): F16H25/22
CPCF16H25/2015F16H25/2204Y10T74/18688Y10T74/18704
Inventor R·A·希默尔曼
Owner HAMILTON SUNDSTRAND CORP
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