Vibration damper for a sensor unit and sensor arrangement for a motor vehicle

Patent metadata

Field	Value
Publication number	US-9689458-B2
Application number	US-201314654243-A
Country	US
Kind code	B2
Filing date	Dec 17, 2013
Priority date	Dec 20, 2012
Publication date	Jun 27, 2017
Grant date	Jun 27, 2017

Abstract

A vibration damper for a sensor unit comprises an elastic damping element including a central plate, a plurality of damping fingers joined at a first end to the central plate, and a plurality of fastening surfaces. At least two fastening surfaces of the plurality of fastening surfaces are disposed at a distance from each other in a first spatial direction. The damping element is flexurally elastically soft along the first spatial direction and is formed with a higher stiffness in a main extension plane defined perpendicular to the first spatial direction. A layer of adhesive is applied to each of the at least two fastening surfaces which are configured to be subjected to shear stress as a result of vibrations in the main extension plane.

First claim

The invention claimed is:

1. A vibration damper for a sensor unit, comprising:
an elastic damping element including:
a central plate;
a plurality of damping fingers, each damping finger of the plurality of damping fingers joined at a first end to the central plate; and
a plurality of fastening surfaces, wherein:

the central plate has a first fastening surface of the plurality of fastening surfaces,
at least one of the damping fingers of the plurality of damping fingers has a second fastening surface of the plurality of fastening surfaces,
the first and second fastening surfaces are disposed at a distance from each other in a first spatial direction,
the damping element is flexurally elastically soft along the first spatial direction and is formed with a higher stiffness in a main extension plane defined perpendicular to the first spatial direction,
a first layer of adhesive is applied to the first fastening surface and a second layer of adhesive is applied to the second fastening surface, and the first and second layers of adhesive are configured and arranged to be subjected to shear stress as a result of vibrations in the main extension plane, and
the first fastening surface is fastened directly to a housing of the sensor unit via the first layer of adhesive and the second fastening surface is fastened directly to a supporting plate of the sensor unit via the second layer of adhesive.

2. The vibration damper as claimed in claim 1 , wherein each damping finger of the plurality of damping fingers includes a second fastening surface at a free, second end.

3. The vibration damper as claimed in claim 2 , further comprising:
a plurality of transition regions each having two bending edges, each of the plurality of transition regions located between the central plate and a respective free, second end of the plurality of damping fingers.

4. The vibration damper as claimed in claim 1 , wherein a shape and a dimension of the damping element are configured depending on natural vibration modes and a planar thermal expansion of an assembly that is to be damped with restriction of a thermal expansion that is to be minimized.

5. The vibration damper as claimed in claim 1 , wherein the damping element is a stamped and bent part.

6. A sensor arrangement, comprising:
a housing;
a base plate;
fastening elements;
a supporting plate, the base plate joined to the supporting plate by the fastening elements;
at least one micromechanical or microelectromechanical sensor positioned on the supporting plate; and
a vibration damper including an elastic damping element including a central plate, a plurality of damping fingers, each joined at a first end to the central plate, and a plurality of fastening surfaces, wherein:
the central plate has a first fastening surface of the plurality of fastening surfaces and at least one of the damping fingers of the plurality of damping fingers has a second fastening surface of the plurality of fastening surfaces,
the first and second fastening surfaces are disposed at a distance from each other in a first spatial direction;
the damping element is flexurally elastically soft along the first spatial direction and is formed with a higher stiffness in a main extension plane defined perpendicular to the first spatial direction;
a first layer of adhesive is applied to the first fastening surface and a second layer of adhesive is applied to the second fastening surface, and the first and second layers of adhesive are configured and arranged to be subjected to shear stress as a result of vibrations in the main extension plane;
wherein the first fastening surface is directly fastened to the housing via the first layer of adhesive and the second fastening surface is directly fastened to the supporting plate via the second layer of adhesive, and
wherein the supporting plate is joined to the housing via the vibration damper.

7. The sensor arrangement as claimed in claim 6 , wherein
the at least one damping finger is joined to an attachment point of the supporting plate via the second layer of adhesive.

8. The sensor arrangement as claimed in claim 7 , wherein the attachment point of the supporting plate is located on a thermal package and/or on an electrical or electronic component which is/are permanently joined to the supporting plate.

9. The sensor arrangement as claimed in claim 6 , further comprising:
pressfit pins, the supporting plate joined to the base plate by the pressfit pins.

Assignees

• Bosch Gmbh Robert

Inventors

• Pruksch Achim
• Kaeferstein Berthold

Classifications

• G01P1/003 Primary

  used for damping · CPC title

• G01D11/10

  Elements for damping the movement of parts · CPC title

• F16F15/04 Primary

  using elastic means (single elements or their attachment F16F1/00 - F16F13/00); {(F16F15/023, F16F15/03 take precedence)} · CPC title

• F16F1/00

  Springs (working with fluid F16F5/00, F16F9/00) · CPC title

• G01P1/023

  for acceleration measuring devices · CPC title