Measuring and testing – Dynamometers – Responsive to torque
Reexamination Certificate
1999-03-18
2001-10-16
Fuller, Benjamin R. (Department: 2855)
Measuring and testing
Dynamometers
Responsive to torque
C075S728000, C075S010330
Reexamination Certificate
active
06301976
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a torque sensing apparatus, and more particularly to a torque sensor that includes a magnetoelastic member.
BACKGROUND OF THE INVENTION
Numerous torque sensing devices have been developed to detect torque applied to an elongated shaft. Such torque sensing devices typically include a magnetoelastic ring secured about a shaft. The ring provides a magnetic field, typically in the axial direction, in response to torque applied to the shaft. A sensor is positioned adjacent to the magnetoelastic ring for sensing the magnetic field. The amount of torque is determined based upon the sensed magnetic field. Such systems often require complex sensors to adequately detect the magnetic field.
SUMMARY OF THE INVENTION
The present invention relates to a torque sensing apparatus for sensing torque in an elongated shaft having a longitudinal axis. The torque sensing apparatus includes a cylindrical magnetoelastic member secured coaxially about the shaft. The magnetoelastic member has first and second spaced apart end portions. Each end portion is axially chamfered at a predetermined angle with respect to a plane extending perpendicular to the shaft axis. The predetermined angle for each end portion ranges from about 42° to about 48°. The magnetoelastic member provides an axial magnetic field which changes in response to a torque applied to the shaft. A detector is positioned adjacent to the magnetoelastic member for sensing the magnetic field and providing a signal indicative of the applied torque.
BRIEF DESCRIPTION OF THE DRAWING
The foregoing and other features of the invention will become more apparent to one skilled in the art upon consideration of the following description of the invention and the accompanying drawing which illustrates a side elevation of a torque sensing apparatus in accordance with a preferred embodiment of the present invention.
REFERENCES:
patent: 4845999 (1989-07-01), Sobel
patent: 4873874 (1989-10-01), Sobel
patent: 5280729 (1994-01-01), Aoki et al.
patent: 5353649 (1994-10-01), Hase et al.
patent: 5520059 (1996-05-01), Garshelis
patent: 5831180 (1998-11-01), Tanaka et al.
patent: 63317734 (1988-12-01), None
patent: 05045240 (1993-02-01), None
Allen Andre
Fuller Benjamin R.
Tarolli, Sundheim, Covell Tummino & Szabo L.L.P.
TRW Inc.
LandOfFree
Torque sensing apparatus having a magnetoelastic member... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Torque sensing apparatus having a magnetoelastic member..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Torque sensing apparatus having a magnetoelastic member... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2597895