US7339308B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Actuating unit for a piezo-electrically controlled fuel injection valve
Assignee: Robert Bosch GmbH
•
Filing: 2004-03-19
•
Granted: 2008-03-04
•
Expires: 2024-03-19
Abstract
Abstract An actuator unit which is suitable for actuating a fuel injection valve of an injection system for internal combustion engines includes a piezoelectric actuator and a hollow body embodied as a spring. The service life of the actuator unit can be improved by designing the hollow body to eliminate or minimize bending stresses on the piezoelectric actuator.
Inventors
- 👤 Friedrich Boecking
- 👤 Dieter Kienzler
- 👤 Dietmar Uhlmann
- 👤 Uwe Bruetsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:41
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/80; H10N30/88; F; F02; F02M; F02M51/00; F02M51/06; F02M51/0603; H10N30/886; F02M2200/00; F02M2200/26
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
109 words
An actuator unit, comprising a piezoelectric actuator ( 1 ) disposed in a hollow body ( 4 ), the hollow body ( 4 ) being embodied elastically and prestressing the actuator ( 1 ), a plurality of recesses ( 7 ) formed though the hollow body ( 4 ) a first seam ( 31 ) in the hollow body extending parallel to the longitudinal axis ( 35 ), of the hollow body, and at least one second seam ( 33 ) which is located diametrically opposite the first seam ( 31 ), and located selectively at one or both end portions of the hollow body but not medially thereof.
Claim 2
Dependent Claim
109 words
An actuator unit, comprising a piezoelectric actuator ( 1 ) disposed in a hollow body ( 4 ), the hollow body ( 4 ) being embodied elastically and prestressing the actuator ( 1 ), a plurality of recesses ( 7 ) formed though the hollow body ( 4 ) a first seam ( 31 ) in the hollow body extending parallel to the longitudinal axis ( 35 ), of the hollow body, and at least one second seam ( 33 ) which is located diametrically opposite the first seam ( 31 ), and located selectively at one or both end portions of the hollow body but not medially thereof.
Claim 3
Dependent Claim
103 words
An actuator unit, comprising a piezoelectric actuator ( 1 ) disposed in a hollow body ( 4 ), the hollow body ( 4 ) being embodied elastically and prestressing the actuator ( 1 ), a plurality of recesses ( 7 ) formed through the hollow body ( 4 ), a first seam ( 31 ) in the hollow body extending parallel to the longitudinal axis ( 35 ) of the hollow body, and a first recess formed at least on a first end ( 17 ) of the hollow body ( 4 ) and located diametrically opposite the first seam ( 31 ).
Claim 4
Dependent Claim
103 words
An actuator unit, comprising a piezoelectric actuator ( 1 ) disposed in a hollow body ( 4 ), the hollow body ( 4 ) being embodied elastically and prestressing the actuator ( 1 ), a plurality of recesses ( 7 ) formed through the hollow body ( 4 ), a first seam ( 31 ) in the hollow body extending parallel to the longitudinal axis ( 35 ) of the hollow body, and a first recess formed at least on a first end ( 17 ) of the hollow body ( 4 ) and located diametrically opposite the first seam ( 31 ).
Claim 5
Dependent Claim
39 words
The actuator unit of claim 2 , further comprising a further recess ( 51 ), located diametrically opposite the first seam ( 31 ) and on a second end ( 15 ) of the hollow body ( 4 ).
Claim 6
Dependent Claim
48 words
The actuator unit of claim 2 , wherein one recess ( 53 ) each is provided on the first end ( 17 ) and/or on the second end ( 15 ) of the hollow body ( 4 ), in the region of the first seam ( 31 ).
Claim 7
Dependent Claim
39 words
The actuator unit of claim 1 , wherein the hollow body ( 4 ) is joined on its first end ( 17 ) to an upper cover plate ( 6 ) or to an adjusting disk ( 93 ).
Claim 8
Dependent Claim
39 words
The actuator unit of claim 2 , wherein the hollow body ( 4 ) is joined on its first end ( 17 ) to an upper cover plate ( 6 ) or to an adjusting disk ( 93 ).
Claim 9
Dependent Claim
24 words
The actuator unit of claim 1 , wherein the hollow body ( 4 ) is radially fixed on its first end ( 17 ).
Claim 10
Dependent Claim
24 words
The actuator unit of claim 2 , wherein the hollow body ( 4 ) is radially fixed on its first end ( 17 ).
Claim 11
Dependent Claim
49 words
The actuator unit of claim 7 , wherein the hollow body ( 4 ) is fixed radially on its first end ( 17 ) in the upper cover plate ( 6 ) in particular by means of an annular groove ( 39 ) or a shoulder ( 37 ).
Claim 12
Dependent Claim
48 words
The actuator unit of claim 7 , wherein the hollow body ( 4 ) is fixed radially on its first end ( 17 ) in the adjusting disk ( 93 ) in particular by means of an annular groove ( 39 ) or a shoulder ( 37 ).
Claim 13
Dependent Claim
36 words
The actuator unit of claim 7 , wherein the hollow body ( 4 ) is secured by its first end ( 17 ) to the upper cover plate ( 6 ) by welding ( 41 ).
Claim 14
Dependent Claim
35 words
The actuator unit of claim 2 , wherein the contacting of a piezoelectric actuator ( 1 ) located in the hollow body ( 4 ) is effected via the upper cover plate ( 6 ).
Claim 15
Dependent Claim
45 words
The actuator unit of claim 2 , wherein the upper cover plate ( 6 ) is embodied in two parts ( 6 a , 6 b ); and wherein a parting seam is present between the two pans ( 6 a , 6 b ).
Claim 16
Dependent Claim
38 words
The actuator unit of claim 13 , wherein the first seam ( 31 ) and the second seam ( 33 ) open into the parting seam of the upper cover plate ( 6 a , 6 b ).
Claim 17
Dependent Claim
30 words
The actuator unit of claim 12 , further comprising a ceramic insulator ( 43 ) electrically insulating the upper cover plate ( 6 , 6 a , 6 b ).
Claim 18
Dependent Claim
34 words
The actuator unit of claim 12 , further comprising a securing clamp ( 45 ) or a securing cup holding the upper cover plate ( 6 , 6 a , 6 b ) together.
Claim 19
Dependent Claim
33 words
The actuator unit of claim 12 , further comprising a flexible, plastic-bonded metal or a soft solder binding mean between the hollow body ( 4 ) and the piezoelectric actuator ( 1 ).
Claim 20
Dependent Claim
24 words
The actuator unit of claim 1 , wherein the hollow body ( 4 ) is radially fixed on its second end ( 15 ).
Claim 21
Dependent Claim
38 words
The actuator unit of claim 1 wherein the hollow body ( 4 ) is joined on its second end ( 15 ) to a lower cover plate ( 5 ) or to a coupler housing ( 86 ).
Claim 22
Dependent Claim
57 words
The actuator unit of claim 19 , wherein the hollow body ( 4 ) is fixed radially on its second end ( 15 ) in the lower cover plate ( 5 ) or in the coupler housing ( 86 ), in particular by means of an annular groove ( 39 ) or a shoulder ( 91 ).
Claim 23
Dependent Claim
36 words
The actuator unit of claim 19 , wherein the hollow body ( 4 ) is secured by its second end ( 15 ) to the lower cover plate ( 5 ) by welding ( 41 ).
Claim 24
Dependent Claim
35 words
The actuator unit of claim 1 , wherein the recesses ( 7 ) are embodied in bonelike shape and extend transversely to the longitudinal axis ( 35 ) of the hollow body ( 4 ).
Claim 25
Dependent Claim
52 words
The actuator unit of claim 1 , wherein a plurality of recesses ( 7 ) are located one behind the other in a plane (E 2 ); and wherein the plane (E 2 ) forms a right angle with the longitudinal axis ( 35 ) of the hollow body ( 4 ).
Claim 26
Dependent Claim
24 words
The actuator unit of claim 23 , wherein there is an even number of recesses ( 7 ) in one plane (E 2 ).
Claim 27
Dependent Claim
34 words
The actuator unit of claim 23 , wherein a plurality of planes (E i ) are provided with recesses ( 7 ); and that the planes (E i ) extend parallel to one another.
Claim 28
Dependent Claim
28 words
The actuator unit of claim 25 , wherein the recesses ( 7 ) of two adjacent planes (E 1 ) are offset ( 23 ) from one another.
Claim 29
Dependent Claim
44 words
The actuator unit of claim 26 , wherein the offset ( 23 ) of the recesses ( 7 ) of two adjacent planes is equal to half the repeat ( 21 ) of the recesses ( 7 ) in one plane (E 1 ).
Claim 30
Dependent Claim
19 words
The actuator unit of claim 1 , wherein the hollow body ( 4 ) has a circular cross section.
Claim 31
Dependent Claim
25 words
The actuator unit of claim 1 , wherein the cross section of the hollow body ( 4 ) has the form of a regular polygon.
Claim 32
Dependent Claim
43 words
The actuator unit of claim 1 , wherein the piezoelectric actuator ( 1 ) is disposed in the hollow body ( 4 ); and wherein the piezoelectric actuator ( 1 ) is stressed in compression by the prestressed hollow body ( 4 ).
Claim 33
Dependent Claim
155 words
An actuator unit, comprising a piezoelectric actuator ( 1 ) disposed adjacent one end of a hollow body ( 4 ), the hollow body ( 4 ) being embodied elastically and being connected to the actuator so as to prestress the actuator ( 1 ), a plurality of recesses ( 7 ) formed through the hollow body ( 4 ) a first seam ( 31 ) in the hollow body extending parallel to the longitudinal axis ( 35 ), of the hollow body and at least one second seam ( 33 ) at least on a first end ( 17 ) portion of the hollow body ( 4 ) and located diametrically opposite the first scam ( 31 ), wherein the piezoelectric actuator ( 1 ) is disposed outside the hollow body ( 4 ); and wherein the piezoelectric actuator ( 1 ) is stressed in compression by the prestressed hollow body ( 4 ).
Claim 34
Dependent Claim
155 words
An actuator unit, comprising a piezoelectric actuator ( 1 ) disposed adjacent one end of a hollow body ( 4 ), the hollow body ( 4 ) being embodied elastically and being connected to the actuator so as to prestress the actuator ( 1 ), a plurality of recesses ( 7 ) formed through the hollow body ( 4 ) a first seam ( 31 ) in the hollow body extending parallel to the longitudinal axis ( 35 ), of the hollow body and at least one second seam ( 33 ) at least on a first end ( 17 ) portion of the hollow body ( 4 ) and located diametrically opposite the first scam ( 31 ), wherein the piezoelectric actuator ( 1 ) is disposed outside the hollow body ( 4 ); and wherein the piezoelectric actuator ( 1 ) is stressed in compression by the prestressed hollow body ( 4 ).
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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) | 2011-03-04 | 2011-09-03 | 2012-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2015-03-04 | 2015-09-03 | 2016-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2019-03-04 | 2019-09-03 | 2020-03-04 | $7700.00 | Window Closed / Lapsed |