US6333587B1
Expired / Lapsed
US
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Piezoelectric actuator
Assignee: Robert Bosch GmbH
•
Filing: 1999-12-03
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Granted: 2001-12-25
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Expires: 2019-12-03
Abstract
Abstract The invention relates to a piezoelectric actuator in particular for actuating control valves or injection valves in internal combustion engines in motor vehicles, having a piezoelectric actuator body, in particular in the form of a multilayer laminate of stacked layers of piezoelectric material and intervening metal or electrically conductive layers acting as electrodes, in which one of the face ends of the actuator body is fixed on a highly heat-conducting or metal actuator base, in which the piezoelectric actuator includes at least one highly heat-conductive cooling body joined highly heat-conductingly to the side faces of the actuator body and to the actuator base.
Inventors
- 👤 Rudolf Heinz
- 👤 Bertram Sugg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:24
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/50; F; F02; F02M; F02M51/00; F02M51/005; F02M51/06; F02M51/0603; H10N30/80; H10N30/88; F02M63/00; F02M63/0012; F02M63/0014; F02M63/0015; F02M63/0026
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
113 words
A piezoelectric actuator for actuating control valves or injection valves in internal combustion engines in motor vehicles, having a piezoelectric actuator body ( 1 ), in the form of a multilayer laminate of layered plies of piezoelectric material and intervening electrically conductive layers acting as electrodes, said actuator body having face ends and side faces, one of which face ends is fixed on a highly heat-conducting actuator base ( 6 ), and at least one highly heat-conductive cooling body ( 5 ; 5 . 1 , 5 . 2 ) is joined highly heat-conductively to the side faces of the actuator body ( 1 ) and to the actuator base ( 6 ).
Claim 2
Dependent Claim
113 words
A piezoelectric actuator for actuating control valves or injection valves in internal combustion engines in motor vehicles, having a piezoelectric actuator body ( 1 ), in the form of a multilayer laminate of layered plies of piezoelectric material and intervening electrically conductive layers acting as electrodes, said actuator body having face ends and side faces, one of which face ends is fixed on a highly heat-conducting actuator base ( 6 ), and at least one highly heat-conductive cooling body ( 5 ; 5 . 1 , 5 . 2 ) is joined highly heat-conductively to the side faces of the actuator body ( 1 ) and to the actuator base ( 6 ).
Claim 3
Dependent Claim
25 words
The piezoelectric actuator of claim 1 , wherein at least one of said electrically conductive layers and said highly heat conducting actuator base is metallic.
Claim 4
Dependent Claim
33 words
The piezoelectric actuator of claim 2 , in which said at least one highly heat-conducting cooling body ( 5 ; 5 . 1 , 5 . 2 ) is of metal, preferably copper.
Claim 5
Dependent Claim
33 words
The piezoelectric actuator of claim 1 , in which said at least one highly heat-conducting cooling body ( 5 ; 5 . 1 , 5 . 2 ) is of metal, preferably copper.
Claim 6
Dependent Claim
49 words
The piezoelectric actuator of claim 4 , in which the actuator body ( 1 ) has a rectangular cross section, and the at least one cooling body ( 5 ; 5 . 1 , 5 . 2 ) is joined to two opposed side faces of the actuator body.
Claim 7
Dependent Claim
49 words
The piezoelectric actuator of claim 4 , in which the actuator body ( 1 ) has a square cross section, and the at least one cooling body ( 5 ; 5 . 1 , 5 . 2 ) is joined to two opposed side faces of the actuator body.
Claim 8
Dependent Claim
49 words
The piezoelectric actuator of claim 1 , in which the actuator body ( 1 ) has a rectangular cross section, and the at least one cooling body ( 5 ; 5 . 1 , 5 . 2 ) is joined to two opposed side faces of the actuator body.
Claim 9
Dependent Claim
49 words
The piezoelectric actuator of claim 1 , in which the actuator body ( 1 ) has a square cross section, and the at least one cooling body ( 5 ; 5 . 1 , 5 . 2 ) is joined to two opposed side faces of the actuator body.
Claim 10
Dependent Claim
42 words
The piezoelectric actuator of claim 1 , in which said at least one cooling body comprises two separate cooling bodies ( 5 . 1 and 5 . 2 ) joined to two opposed side faces of the actuator body ( 1 ).
Claim 11
Dependent Claim
54 words
The piezoelectric actuator of claim 1 , in which said at least one cooling body ( 5 ) is a single U-shaped cooling body joined to two opposed side faces of the actuator body ( 1 ) and to the face end of the actuator body pointing toward the actuator base ( 6 ).
Claim 12
Dependent Claim
49 words
The piezoelectric actuator of claim 1 , in which said at least one cooling body includes portions ( 5 ; 5 . 1 , 5 . 2 ) that border on the side faces of the actuator body ( 1 ) and take the form of a corrugated band.
Claim 13
Dependent Claim
49 words
The piezoelectric actuator of claim 1 , in which said at least one cooling body ( 5 ; 5 . 1 , 5 . 2 ) is glued to the opposed side faces of the actuator body ( 1 ) with an elastic, thermally conductive adhesive ( 4 ).
Claim 14
Dependent Claim
19 words
The piezoelectric actuator of claim 12 , in which the heat-conductive adhesive ( 4 ) comprises a silicone elastomer.
Claim 15
Dependent Claim
17 words
The piezoelectric actuator of claim 13 , in which the silicone elastomer is filled with heat-conductive filler.
Claim 16
Dependent Claim
35 words
The piezoelectric actuator of claim 1 , in which the at least one cooling body ( 5 ; 5 . 1 , 5 . 2 ) is welded to the actuator base ( 6 ).
Claim 17
Dependent Claim
35 words
The piezoelectric actuator of claim 1 , in which the at least one cooling body ( 5 ; 5 . 1 , 5 . 2 ) is soldered to the actuator base ( 6 ).
Claim 18
Dependent Claim
39 words
The piezoelectric actuator of claim 1 , in which said at least one cooling body 5 ; 5 . 1 , 5 . 2 ) is joined to the actuator base ( 6 ) by a silver conductive adhesive.
Claim 19
Dependent Claim
126 words
A piezoelectric actuator, provided with an actuator body ( 1 ) having side faces and end faces, and having at least one band spring ( 8 ) arranged to prestress the two face ends of the actuator body ( 1 ), said at least one band spring being spaced apart from the actuator body ( 1 ) along the side faces thereof that are not covered by at least one cooling body ( 5 ; 5 . 1 , 5 . 2 ), said at least one band spring and said actuator body define at least one interstice between the side faces of the actuator body ( 1 ) and the band spring ( 8 ), which at least one interstice is filled with heat-conductive elastomer.
Claim 20
Dependent Claim
126 words
A piezoelectric actuator, provided with an actuator body ( 1 ) having side faces and end faces, and having at least one band spring ( 8 ) arranged to prestress the two face ends of the actuator body ( 1 ), said at least one band spring being spaced apart from the actuator body ( 1 ) along the side faces thereof that are not covered by at least one cooling body ( 5 ; 5 . 1 , 5 . 2 ), said at least one band spring and said actuator body define at least one interstice between the side faces of the actuator body ( 1 ) and the band spring ( 8 ), which at least one interstice is filled with heat-conductive elastomer.
Claim 21
Dependent Claim
19 words
The piezoelectric actuator of claim 18 , in which said heat-conductive elastomer is supplied with additional heat conductive filler.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-12-24 | 2005-06-25 | 2005-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-12-24 | 2009-06-25 | 2009-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-12-24 | 2013-06-25 | 2013-12-25 | $7700.00 | Window Closed / Lapsed |