Geometrical instruments – Gauge – Plural tests
Patent
1990-07-25
1992-03-17
Cuchlinski, Jr., William A.
Geometrical instruments
Gauge
Plural tests
33543, 335445, 33600, G01B 712, G01B 731, G01B 512
Patent
active
050956345
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns an instrument for simultaneously measuring a succession of cylinder bores, especially the bores in the bearing lanes of motor blocks, cylinder heads, and similar structures, with respect to shape and alignment.
An instrument of this type and for this purpose is known from the sales literature PAT MULTI-INCOMETER. The instrument is a mobile piece of equipment used to measure a succession of bores like the bores in a crankshaft bearing lane for roundness, geometrical defects, and alignment. It has a probe that operates in conjunction with two motors and a drive mechanism, generating a rotary motion and an axial motion, that is provided with heads associated with the bores in the work that are to be measured with respect to number and position, and that extends when employed as intended through the bores. The probe rotates and slides back and forth in bearings at each end. The bearings can be secured to the particular face of the work by a universal suspension, allowing angular error in the faces of the work to be compensated for within design-dictated limits. The drive unit that the end of the probe extends through is flanged to one of these bearings.
The known instrument has been proven outstanding for measuring bearing lanes that have large-measure bores and/or are not too long. For very long bore lanes and/or small-diameter bores on the other hand there is an unacceptable risk of contaminated results because the drive unit flanged like a projecting collar onto one of the probe's bearings exerts bending moments on the probe that can distort it in ways difficult to correct for.
SUMMARY OF THE INVENTION
The object of the present invention is accordingly to so improve an instrument of the aforesaid type and for the aforesaid purpose that any incorrect results deriving from flections in the probe will at least be extensively reduced and that even very long bore lanes and/or bores with short diameters can be precisely measured.
This object is attained in accordance with the invention in an instrument for simultaneously measuring a succession of bores with respect to shape and alignment in that a probe is an elongated tube with sensors positioned to match the cylinder bores with respect to number and distance apart and having radially projecting contact pins, in that, when employed as intended, the probe rotates and slides back and forth in stationary bearings that are in turn accommodated in uprights in a stand and extends the bores in the work, which is precisely positioned between the uprights by the same bearings, in that a drive unit with a driveshaft in alignment with the probe and with motors that operate in conjunction with the latter to generate a translation and a rotation respectively is also mounted stationary in the stand independent of the aforesaid bearings, and in that one end of the probe is coupled to the driveshaft such that it can neither rotate on nor slide axially along it by a universal joint that compensates within limits for angular error and radial shaft displacement.
Considering the operational relationship between the probe and the drive unit's driveshaft by way of a universal joint that compensates within design-dictated limits for angular error and radial shaft displacement between the driveshaft and the probe, the instrument in accordance with the invention incorporates a drive mechanism that is practically free of transverse forces for a probe that is also mounted completely independent of the drive unit.
To promote the desired adaptability of the instrument to various conditions the universal joint is rigidly secured to the takeoff end of the driveshaft in the drive unit and the probe is coupled to the universal joint, in such a way that it cannot rotate on or slide along it but can be released from it, by a clutch. The clutch can be a compression clutch with a slotted compression ring that has a cylindrical accommodation for one of the probe's insertion pins and that can be radially tensioned by a screw.
In spite of the prac
REFERENCES:
patent: 3889380 (1975-06-01), Albertazzi
patent: 4006529 (1977-02-01), Herman
patent: 4338726 (1982-07-01), Swailes
patent: 4412385 (1983-11-01), Selleri
patent: 4916824 (1990-04-01), Shimazutsu et al.
patent: 4986004 (1991-01-01), Hartmann et al.
Overlach Knud
Wamser Manfred
Cuchlinski Jr. William A.
Fogiel Max
Fulton C. W.
Pietzsch Automatisierungstechnik GmbH
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