Active type dynamic damper

• US 20040017033A1
• Filed: 07/10/2003
• Published: 01/29/2004
• Est. Priority Date: 07/11/2002
• Status: Active Grant

• Current Assignee: Sumitomo Riko Company Limited.
• Original Assignee: Tokai Rubber Industries Limited
• Inventors: Muramatsu, Atsushi, Ichikawa, Hiroyuki
• Granted Patent: US 6,907,969 B2
• Time in Patent Office: Days
• US Class Current: 267/140.14
• CPC Class Codes: F16F 7/1011 by electromagnetic means
• CPC Class Codes: F16F 7/108 on plastics springs

Abstract

A damper main body 11 of a dynamic damper 10 comprises a long flat mounting plate portion 12, a rod-like central supporting metal member 15 which is erected vertically in the center of atop face of the mounting plate portion 12, constituting a supporting member together with the mounting plate portion 12, cylindrical rubber bushings 17 placed on the central supporting metal member in succession from its bottom side, a coil member 24, a magnet portion 28, a yoke 33 and a cylindrical case 38 mounted over the yoke 33. Grommets 41, which are cylindrical supporting portions made of rubber elastic bodies, are inserted into mounting holes 13c in side plate portions 12c of the mounting plate portion. The damper main body is fixed on a mating plate member 45 through the compressed grommets such that it is floated over the mating plate member.

Claims

1. An active dynamic damper comprising:

a supporting member having a mounting plate portion;

a mass member disposed on the side of a surface of the mounting plate portion such that it is departed from the mounting plate portion;

a rubber elastic body connecting portion which connects the supporting member with the mass member elastically; and

a vibration means which generates a driving force by inputting a control pulse signal corresponding to vibration of a vibration generating source to the same vibration means and vibrates said mass member, said mounting plate portion being fixed on a vibration damping object member, wherein said mounting plate portion is fixed on the vibration damping object member through a rubber elastic supporting portion such that it is departed from said vibration damping object member.

2. The active dynamic damper according to claim 1 wherein said control pulse signal is formed by overlaying a pulse width modulated carrier signal having a control frequency of several kHz several tens kHz on a reference pulse signal having the same frequency as the vibration frequency of an input pulse signal corresponding to vibration of a vibration generating source and adjusted in terms of phase and gain.

3. The active dynamic damper according to claim 2 wherein a resonance frequency of said rubber elastic body supporting portion with respect to said mass member is set up to a frequency region higher than said vibration frequency and lower than the control frequency of said carrier signal.