US 6,644,094 B1Granted

Traction coefficient measurement device

AssigneeNsk Ltd.

InventorsRyoichi Otaki, Hiroya Achiha, Shinichi Natsumeda

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Abstract

The present invention provides a traction coefficient measurement device having a driving roller rotated around a driving shaft, a driven shaft is rotated together with a driven shaft, corresponding to the rotation of the driving roller, based on the engagement with the driving roller, and a load device for applying a resistance to the driven shaft against the rotation, wherein the driving shaft is fixed in position and the driven shaft is supported so as to move to and from the driving shaft, and a press apparatus is used to force the driven shaft to the driving shaft for measurement operation, and the driven shaft is positioned lower than the driving shaft in height, and the traction force acting on the engagement portion between the driving roller and the driven roller is directed in a direction to push the driven shaft downward.

Claims12

Dependent claims

A traction coefficient measurement device comprising driving and driven rollers each having an outer peripheral surface defined by generatrices, a support portion for the respective rollers, a drive shaft, and a driven shaft,

the generatrices in at least one of the driving and driven rollers being formed in an arc with a center of curvature to define the outer peripheral surface of the at least one in a convex shape,
the support portion for the at least one being adapted to be relatively displaced around a vertical line extending through the center of curvature of one of the generatrices
one of the drive shaft and the driven shaft being fixed in position, the other being supported so as to move to and from the one shaft, and a press apparatus being used to force the other shaft to the one shaft for measurement operation, and the other shaft being positioned lower than the one shaft in vertical level,
wherein the driving roller has a diameter D10 while the driven roller has a diameter D27, and the other shaft is positioned lower than the one shaft in vertical level by a height difference which is up to 1/2,000 of the smaller one of the diameter D10 and diameter D27.

1 more element

A traction coefficient measurement device comprising:

a drive shaft;
a driven shaft;
a driving roller having an outer peripheral surface and rotated together with the driving shaft by a drive source,
a driven roller having an outer peripheral surface, such that as the outer peripheral surface of the driven roller comes into contact with the outer peripheral surface of the driving roller, the driven roller is rotated together with the driven shaft due to rotation of the driving roller,
a load apparatus for applying to the driven shaft a resistance against the rotation of the driven shaft,
a driving unit support plate for supporting the driving roller, and
a driven unit support plate for supporting the driven roller,
a surface plate on which the driving unit support plate and driven unit support plate are placed,
a translation bearing for supporting the driving unit support plate such that the driving unit support plate can be displaced orthogonal to the direction in which the drive shaft is provided,
a pivot shaft by which the driven unit support plate is mounted to the surface plate at a variable mount angle,
the outer peripheral surface of the driven roller having being defined by generatrices in an arc to form the outer peripheral surface in a convex shape, and
the driven unit support plate having the pivot shaft provided around a vertical line extending through the center of curvature of the generatrices of the outer peripheral surface of the driven roller and being possible to move around the axis of the pivot shaft.

9 more elements

Dependencies are inferred from the claim text.