Ultrasonic vibration processing device

An ultrasonic vibration processing device comprising:

• a housing;
• an ultrasonic vibrator including a horn portion having a distal end portion to which a tool holder is detachably attached and a piezoelectric element held at an intermediate portion in a direction of a rotation axis, the ultrasonic vibrator being supported inside the housing so as to be rotatable around the rotation axis;
• a connecting portion having a front end portion connected to a rear end portion of the ultrasonic vibrator, and stored in the housing so as to be rotatable around the rotation axis together with the ultrasonic vibrator, the connecting portion including a spline bearing having an insertion opening opened at a rear end of the connecting portion;
• a rotational driving unit including a spline shaft that is inserted into the spline bearing through the insertion opening of the connecting portion and rotatable around the rotation axis, the rotational driving unit being connected to a rear end portion of the connecting portion;
• and
• a non-contact power supply unit including a primary transformer and a secondary transformer, the primary transformer being fixed to the housing and including a primary coil that receives high frequency power from an external power supply, the secondary transformer being connected to a rear end of the ultrasonic vibrator with a clearance maintained between the secondary transformer and the primary transformer, the secondary transformer being configured to be rotated around the rotation axis together with the ultrasonic vibrator and including a secondary coil that supplies an induced electromotive force, generated between the secondary coil and the primary coil by electromagnetic induction, to the piezoelectric element, and wherein the spline bearing is located at a node of ultrasonic vibration generated by the piezoelectric element.

An ultrasonic vibration processing device comprising:

• a housing;
• an ultrasonic vibrator including a horn portion having a distal end portion to which a tool holder is detachably attached and a piezoelectric element held at an intermediate portion in a direction of a rotation axis, the ultrasonic vibrator being supported inside the housing so as to be rotatable around the rotation axis;
• a connecting portion having a front end portion connected to a rear end portion of the ultrasonic vibrator, and stored in the housing so as to be rotatable around the rotation axis together with the ultrasonic vibrator, the connecting portion including a spline bearing having an insertion opening opened at a rear end of the connecting portion;
• a rotational driving unit including a spline shaft that is inserted into the spline bearing through the insertion opening of the connecting portion and rotatable around the rotation axis, the rotational driving unit being connected to a rear end portion of the connection portion;
• and
• a non-contact power supply unit including a primary transformer and a secondary transformer, the primary transformer being fixed to the housing and including a primary coil that receives high frequency power from an external power supply, the secondary transformer being connected to a rear end of the ultrasonic vibrator with a clearance maintained between the secondary transformer and the primary transformer, the secondary transformer being configured to be rotated around the rotation axis together with the ultrasonic vibrator and including a secondary coil that supplies an induced electromotive force, generated between the secondary coil and the primary coil by electromagnetic induction, to the piezoelectric element, and wherein an inner circumferential surface of the spline bearing and an outer circumferential surface of the spline shaft are coated with DLC (Diamond-Like Carbon).