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Torque reacting bellows seal for linear actuator

A linear actuator, bellows technology, applied in the direction of transmission, belt/chain/gear, bellows, etc., can solve problems such as increasing actuator wear and reducing efficiency

Inactive Publication Date: 2011-08-17
HAMILTON SUNDSTRAND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most, if not all, dynamic seals provide some level of leakage which increases wear on the actuator and reduces efficiency

Method used

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  • Torque reacting bellows seal for linear actuator
  • Torque reacting bellows seal for linear actuator
  • Torque reacting bellows seal for linear actuator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] figure 1 A cross-sectional view of one embodiment of the linear actuator 10 is shown in . The actuator 10 includes a nut 12 and a lead screw 14 disposed within an actuator housing 16 . Lead screw 14 is positioned at the radial inside of nut 12, and just as figure 2 As shown, a helical channel 18 is included at the outer surface 20 of the lead screw 14 . The nut 12 substantially surrounds the screw 14 and includes a plurality of ball bearings 22 secured within the nut 12 and located within the helical channel 18 . As lead screw 14 rotates about lead screw axis 24 , ball bearing 22 runs along helical channel 18 , forcing nut 12 to translate linearly relative to lead screw 14 along lead screw axis 24 . Although in the illustrated embodiment the lead screw 14 is rotated to linearly translate the nut 12 , it should be understood that other embodiments may include rotating the nut 12 which linearly translates the lead screw 14 along the lead screw axis 24 .

[0014] See ...

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PUM

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Abstract

Disclosed is a linear actuator (10) including a housing (16) and a rotating element (14) located in the housing (16). A nonrotating element (12) is located in the housing (16) in operable communication with the rotating element (14). A bellows seal (40) is secured to the housing (16) and the nonrotating element (12) to react a torque applied to the rotating element (14) and allow linear translation of the nonrotating element (12) along an axis of rotation (24) of the rotating element (14). A method of operating a linear actuator (10) includes applying a torque to a rotating component (14) of the linear actuator (10) located in a housing (16) at an axis of rotation (24), and operably connected to a non-rotating component (12). The rotating component (14) is rotated about the axis of rotation (24) as a result of the torque application and the torque is reacted through a bellows seal (40) secured to the nonrotating component (12) and the housing (16). The nonrotating component (12) is translated linearly along the axis of rotation (24).

Description

technical field [0001] The subject matter disclosed herein relates generally to actuators. More specifically, the subject matter disclosed herein relates to torque reaction devices for linear actuators. Background technique [0002] Linear actuators, especially ball screw actuators, convert rotary motion to linear motion through a helical raceway interface between rotating and non-rotating parts. Multiple ball bearings are typically arranged in a helical raceway between a rotating part (usually a nut) and a non-rotating part (usually a lead screw). When torque is applied to the nut, and as the nut rotates while the lead screw is prevented from rotating, the ball bearings are forced to move along the helical raceways, thereby forcing the lead screw to move in a linear direction. [0003] To prevent the screw from rotating, the torque applied to the nut must be reacted to some degree. One way to react nut torque is to employ structures associated with the actuation load. B...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H25/22F16H25/24
CPCF16J3/041F16H25/2418F16H25/2204Y10T74/18576Y10T74/18568
Inventor R.A.希默尔曼
Owner HAMILTON SUNDSTRAND CORP