Structure of bearing of geared shaft
AssigneeNissan Motor Co., Ltd.
InventorNoboru Maruyama
Life of this patent
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Abstract
A structure of bearing journaling a geared shaft is disclosed in which a piezoelectric sensor is installed in a space between an outer ring of the bearing and its casing for detecting at least one of a force applied to the bearing and generated due to a mesh of gears, its acceleration, velocity, or displacement and outputting a detection signal according to a result of detection of the force and a piezoelectric actuator installed in the bearing so as to be in series with the piezoelectric element sensor or so as to be axially symmetrical to the opposing piezoelectric element sensor for providing an expansion and constriction movement according to a drive signal, the driving signal being based on the detection signal and having a phase opposite to the phase of the force detected by the piezoelectric element sensor.
Claims11
A structure of a bearing of a geared shaft, comprising:
- a) a bearing having a casing;
- an inner ring linked to the geared shaft;
- an outer ring interposed between the inner ring and the casing;
- b) detecting means for detecting at least one of a force applied to the bearing in a predetermined direction, its acceleration, velocity, or displacement in a mid way through which the detecting means is installed, the force being generated due to a transmission of a vibration from the geared portion of the shaft to the bearing at which its gears are meshed with other gears and for outputting a signal according to a result of detection of at least one of the force, acceleration, velocity or displacement;
- c) an actuator, responsive to a drive signal supplied thereto, for spontaneously expanding or constricting in the predetermined direction according to the drive signal;
- and
- d) driving means interposed between the detecting means and the actuator for providing the drive signal for the actuator, the drive signal being provided on the basis of the detection signal of the detecting means so that the expansion and constriction of the actuator serve to absorb the vibration due to the meshing of the gears.
A structure of a bearing of a geared shaft, comprising:
- a) a bearing having a casing;
- an inner ring linked to the geared shaft;
- an outer ring interposed between the inner ring and the casing;
- b) detecting means for detecting a force applied to the bearing toward a radial direction of the bearing and generated due to an engagement of any one of gears of the geared shaft with another of gears and outputting a detection signal according to the result of detection of the force;
- c) an actuator, responsive to a drive signal supplied thereto, for providing a counteractive force so as to cancel the force according to the drive signal;
- and
- d) driving means interposed between the detecting means and the actuator for providing the drive signal for the actuator, the drive signal being provided on the basis of the detection signal of the detecting means so that the counteractive force exerted by the actuator cancels the force applied to the bearing.
Dependencies are inferred from the claim text.