Nsk Corporation

Takeo Kawamata

Takashi Maeda

Hiroyuki Matsuzaki

Hiroshi Shibazaki

Kazumasa Nakajima

A bearing vibration measuring apparatus is an apparatus of measuring vibration of a bearing. The bearing vibration measuring apparatus detects a vibration component generated from the bearing in a state of pressing one of an inner ring and an outer ring of the bearing in an axial direction while relatively rotating other of the inner ring and the outer ring to detect a defect of the bearing based on the vibration component. The bearing vibration measuring apparatus includes a driving mechanism elongated and contracted for inclining the inner ring or the outer ring.

Bearing vibration measuring apparatus, bearing vibration measuring method, and radial type bearing

A ball bearing inspection apparatus,comprising: a rotation shaft,fitted to one (for example, inner race,) of inner and outer races,and,for rotating one race while limiting the movement of one race in an axial direction of the rotation shaft,a press plate,disposed on an opposite side of the rotation shaft,with respect to a ball bearing,for pressing the other race (for example, outer race,) in the axial direction of the rotation shaft,while limiting the rotation of the other race; and a press-back plate,provided so as to be movable in the axial direction of the rotation shaft,for pressing back the other race in a direction reverse to the pressing direction of the press plate,Hence, the ball bearing inspection apparatus can inspect a large area of ball surfaces in a short time at one installing try.

Ball bearing inspection apparatus

While maintaining a shaft in a fixed state, an outer ring is rotated. Vibrations of the shaft are detected by a first vibration pickup and a second vibration pickup. Detection signals of both the vibration pickups are delivered to a frequency converter via amplifier, respectively. The frequency converter determines, by Fourier transformation, the rotation frequency of the outer ring, the revolution frequency of balls and the resonance frequency of the double-row ball bearing. A first computing assembly then calculates the contact angle and bearing rigidity, and a second computing assembly calculates the preload.

Method and instrument for measuring for measuring preload of rolling

While maintaining a shaft in a fixed state, an outer ring is rotated. Vibrations of the shaft are detected by a first vibration pickup and a second vibration pickup. Detection signals of both the vibration pickups are delivered to a frequency converter via amplifier, respectively. The frequency converter determines, by Fourier transformation, the rotation frequency of the outer ring, the revolution frequency of balls and the resonance frequency of the double-row ball bearing. The first computing device then calculates the contact angle and bearing rigidity, and the second computing device calculates the preload.

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Kanagawa, Japan

Takeo Kawamata