Measuring and testing – Dynamometers – Responsive to force
Patent
1998-01-21
2000-08-08
Noori, Max
Measuring and testing
Dynamometers
Responsive to force
G01L 500
Patent
active
060984694
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a dynamometric detector device and method for bearings, which applies a means of transmitting stresses integral with a bearing ring and ensures connection with a sensor means.
FIELD OF THE INVENTION
Patent FR-A-2125926 describes a bearing in which a ring carries strain gages and is provided with a fitted sleeve which carries the means of connection of a connecting cable from said gages to a measuring apparatus.
Mounting of such strain gages on the bearing necessitates prior machining of the ring. Therefore, the dynamometric detector device cannot equip a bearing not containing such machining, such as a mass-produced bearing.
SUMMARY OF THE INVENTION
According to the invention, the means transmitting stress and supporting the sensor means consists of the frame of the gasket of the bearing, in which a cylindrical bearing surface of mounting on a stationary bearing ring is extended radially by a support disk of a sealing lip of said gasket.
The device thus formed is advantageously fastened to the support frame of a removable gasket. Consequently, the device can be mounted on different types of bearings without prior modification of the components of the bearing.
The bearing equipped with a gasket carrying the detector device according to the invention therefore possesses standardized dimensional characteristics which allow its integration in existing application assemblies.
BRIEF DESCRIPTION OF THE DRAWINGS
Other characteristics and advantages of the invention will appear on reading the specification of working examples of the dynamometric detector device, with reference to the attached drawing on which:
FIG. 1 is a radial section of a bearing equipped with the dynamometric detector device mounted on a gasket with radial lip.
FIG. 2 is a view on a larger scale of the zone of mounting of the gasket represented on FIG. 1.
FIG. 3 is a view on a larger scale of the zone of mounting of the gasket equipped with a variant application of the dynamometric detector device.
FIG. 4 is a perspective of the frame represented on FIG. 3, supporting the detector device and the gasket.
FIGS. 5 and 6 are schematic representations of a bearing and of the zones of mounting of the detector device.
FIGS. 7 and 8 represent the diagram of variation of the signal depicting the load of the bearing as a function of time, with reference to the assemblies of the device represented on FIGS. 5 and 6 respectively.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 represents a bearing consisting mainly of a stationary outer ring 1, a rotating inner ring 2 and rolling bodies 3 in contact with the bearing races carried by said rings 1, 2. Gaskets 4, 5 are carried by the outer ring and are located on both sides of the bearing race machined in said ring.
The gaskets 4 and 5 respectively possess a mounting support frame 6, 7. The frame, such as 6, possesses a cylindrical axial bearing surface.
The frame 7 on which the stress transmitting means is fastened possesses a cylindrical axial bearing surface 11 of mounting in contact with the bore 12 of the stationary ring 1 and a disk-shaped radial extension 13 supporting a sealing lip of the gasket 8.
The frame 7 also carries the head 14 of a connecting cable 15, a working example of which is described in patent EP-A-484195.
The transmitting means consists of a sensor element 16, sensitive to the deformations it undergoes.
By way of example, the stress sensor element consists of a piezoelectric or piezoresistive film placed on the cylindrical part 11 (FIG. 3) or on the support disk 13 (FIG. 2).
The sensor element 16 is fastened by any known means either on the free face of the axial bearing surface 11 (FIG. 3) or on one of the faces of the disk 13 (FIG. 2). The sensor element 16 can possibly be molded with the elastomer constituting the gasket 8.
FIG. 4 is a working example of the frame 7 and shows at least one elastically deformable A.sub..chi. (.chi.=1) which possesses an increased sensitivity to deformation stresses. For that purpose, the
REFERENCES:
patent: 4138783 (1979-02-01), Portier
Noori Max
SNR Roulements
Thompson Jewel
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