Active vibration-absorber
First Claim
1. An active vibration-absorber for a vibrating machine part, the vibration-absorber defining an axial direction, comprising:
- a carrier plate adapted to be attached to a vibrating machine part;
a magnet system including a magnet casing movably disposed along the axial direction of the vibration-absorber, a permanent magnet disposed in said magnet casing, and an electrical coil projecting away from said carrier plate and into said magnet casing;
a stationary ferromagnet defining a magnetic leakage field with said magnet system for holding said magnet system in the axial direction;
and a stationary, central guide bolt extending axially in said magnet casing, said magnet system being guided on said central guide bolt.
1 Assignment
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Accused Products
Abstract
The active vibration-absorber is, in particular, an engine mount for motor vehicles. A magnet system has a magnet casing which receives a permanent magnet and which is guided in the assembly so as to be capable of movement in the axial direction. An electrical moving coil projects perpendicularly from a carrier plate and moves into the magnet casing. The carrier plate can be connected to a vibrating machine part, such as between the engine and the vehicle frame. The magnet system is held, in the axial direction, by a magnetic leakage field which is present between the magnet system and stationary ferromagnet.
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Citations
15 Claims
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1. An active vibration-absorber for a vibrating machine part, the vibration-absorber defining an axial direction, comprising:
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a carrier plate adapted to be attached to a vibrating machine part; a magnet system including a magnet casing movably disposed along the axial direction of the vibration-absorber, a permanent magnet disposed in said magnet casing, and an electrical coil projecting away from said carrier plate and into said magnet casing; a stationary ferromagnet defining a magnetic leakage field with said magnet system for holding said magnet system in the axial direction; and a stationary, central guide bolt extending axially in said magnet casing, said magnet system being guided on said central guide bolt. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An active vibration-absorber for a vibrating machine part, the vibration-absorber defining an axial direction, comprising:
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a carrier plate adapted to be attached to a vibrating machine part; a magnet system including a magnet casing movably disposed along the axial direction of the vibration-absorber, a permanent magnet disposed in said magnet casing, and an electrical coil projecting substantially perpendicularly away from said carrier plate and into said magnet casing;
a stationary ferromagnet defining a magnetic leakage field with said magnet system for holding said magnet system in the axial direction and defining an adjustable restoring force of the vibration-absorber;a stationary, central guide bolt extending axially in said magnet casing, said magnet casing being guided on said central guide bolt; a housing shell surrounding said magnet casing with a spacing therebetween, centering caps closing off said housing shell at end faces thereof and being attached to said central guide bolt; and wherein the adjustable restoring force is adjustable by changing a shape of said stationary ferromagnet.
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Specification