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Radford, VA, United States

Horn H.,Thomson Industries Inc.
Machine Design | Year: 2012

Planetary gearheads are high-precision, motion-control devices that generate substantial torque for their size, have high torsional stiffness, and low backlash, making them suited for wide-ranging tasks. A planetary gearhead takes a high-speed, low-torque input, say from an electric motor, then increases torque and reduces speed at the output by the gearhead ratio. This lets motors run at higher, more-efficient rpms in equipment that operates at low speeds. Planetary units with helical gears, rather than spur gears, have a larger contact ratio. Single-stage planetary gearhead ratios range from 3:1 to 10:1. Gear ratios cannot exceed 10:1 because pinion gears can be made only so small. Gear ratios greater than 10:1 are possible with an additional planetary stage, although this normally increases length and cost. To precisely size a gearhead, however, engineers must consider the complete motion profile, including speed, torque, acceleration, deceleration, and cycle rate. Source


Patent
Thomson Industries Inc. | Date: 2014-04-01

An anti-rotation device for use in a linear actuator comprises a hollow body permitting passage of a screw therein. At least one pair of legs extends longitudinally away from the hollow body and each leg of the at least one pair includes a first key feature configured for mating or complementary engagement with a second key feature of an housing used to enclose the screw, nut and anti-rotation device. In one embodiment, each leg is configured to extend or flex radially outward relative to an outer diameter of the hollow body. In another embodiment, the second key features of the housing are substantially longitudinally uniform, whereas the first key feature of at least one of the legs includes a longitudinally non-uniform feature. These pre-loading features induce self-centering of the anti-rotation device that reduces or eliminates play between the components and noise while also improving performance of the linear actuator.


Patent
Thomson Industries Inc. | Date: 2015-12-01

A linear motion bearing system that includes a rolling element retainer structure having at least a portion of a plurality of open axial rolling element tracks formed therein. The rolling element tracks includes an open load-bearing portion, an open return portion and turnarounds interconnecting the load bearing and return portions. Bearing rolling elements are disposed in the rolling element tracks. Load bearing outer races are axially positioned adjacent the rolling element retainer structure for receiving load from the rolling elements disposed in the load-bearing portion of the rolling element tracks. An outer housing sleeve is effective to hold the rolling element retainer structure. A rail is effective to mate with the rolling element retainer structure, the rail including at least one recess sized and shaped so as to be mateable with at least one of the bearing rolling elements.


Patent
Thomson Industries Inc. | Date: 2011-07-15

A linear motion bearing assembly comprising a ball retainer structure having at least a portion of a plurality of open axial ball tracks formed therein. The ball tracks including an open load-bearing portion, an open return portion and turnarounds interconnecting the load bearing and return portions. A plurality of bearing balls are disposed in the ball tracks. At lease one load bearing plate is axially positioned adjacent said ball retainer structure for receiving load from the balls disposed in the load-bearing portion of the ball tracks. Various outer housing sleeves are disclosed including a structure split axially and a monolithic structure.


Patent
Thomson Industries Inc. | Date: 2015-02-17

A linear motion bearing assembly comprising a ball retainer structure having at least a portion of a plurality of open axial ball tracks formed therein. The ball tracks including an open load bearing portion, an open return portion and turnarounds interconnecting the load bearing and return portions. A plurality of bearing balls are disposed in the ball tracks. A plurality of load bearing plates are axially positioned adjacent the ball retainer structure for receiving load from the balls disposed in the load bearing portion of the ball tracks. A first outer housing sleeve is effective to hold the ball retainer structure. The first outer housing sleeve includes a first interlock structure. A second outer housing sleeve is effective to hold the ball retainer structure, the second outer housing sleeve including a second interlock structure. The first interlock structure is effective to mate with the second interlock structure.

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