US4510898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reciprocating piston internal combustion engine, preferably of four-cylinder construction
Assignee: Dr Ing HCF Porsche AG
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Filing: 1982-09-27
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Granted: 1985-04-16
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Expires: 2002-09-27
Abstract
Abstract A reciprocating piston internal combustion engine equipped with a vibration-damping balancing shaft that is rotatably supported in a bearing housing which in turn is secured at the cylinder crankcase by means of a threaded connection; in order to support the rotational forces of the balancing shaft between bearing housing and cylinder housing without play, at least one of the bolts of the threaded connection includes a conically shaped neck that cooperates with a corresponding chamfering in the bearing housing.
Inventors
- 👤 Herbert Ampferer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:36
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/02; F01L1/04; F02; F02B; F02B67/00; F02B67/04; F02B75/00; F02B75/16; F02B75/18; F02B2075/1804; F02B2075/1816
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
82 words
A reciprocating piston internal combustion engine with a cylinder crankcase comprising at least one balancing shaft means for damping of vibration rotatably supported by a bearing housing retained relative to a cylinder crankcase by a threaded connection means, at least one part of the threaded connection means being a bolt, said bolt being a stud bolt which is connected with a bolt nut having the conically shaped neck cooperating with a corresponding chamfered area of one of the bearing housing and crankcase.
Claim 2
Dependent Claim
82 words
A reciprocating piston internal combustion engine with a cylinder crankcase comprising at least one balancing shaft means for damping of vibration rotatably supported by a bearing housing retained relative to a cylinder crankcase by a threaded connection means, at least one part of the threaded connection means being a bolt, said bolt being a stud bolt which is connected with a bolt nut having the conically shaped neck cooperating with a corresponding chamfered area of one of the bearing housing and crankcase.
Claim 3
Dependent Claim
34 words
A reciprocating piston internal combustion engine according to claim 1, wherein a threaded portion of the stud bolt includes a conically shaped neck which is supported at a chamfered area of the cylinder crankcase.
Claim 4
Dependent Claim
19 words
A reciprocating piston internal combustion engine according to claim 1, wherein the neck and chamfered area have rounded-off surfaces.
Claim 5
Dependent Claim
71 words
A reciprocating piston internal combustion engine with a cylinder crankcase comprising at least one balancing shaft means for damping of vibration rotatably supported by a bearing housing retained relative to a cylinder crankcase by a threaded connection means, at least one part of the threaded connection means being a bolt nut and including a conically shaped neck cooperating with a corresponding chamfered area of one of the bearing housing and crankcase.
Claim 6
Dependent Claim
71 words
A reciprocating piston internal combustion engine with a cylinder crankcase comprising at least one balancing shaft means for damping of vibration rotatably supported by a bearing housing retained relative to a cylinder crankcase by a threaded connection means, at least one part of the threaded connection means being a bolt nut and including a conically shaped neck cooperating with a corresponding chamfered area of one of the bearing housing and crankcase.
Claim 7
Dependent Claim
20 words
A reciprocating piston internal combustion engine according to claim 1, wherein the neck and the chambered area have rounded-off surfaces.
References Cited (Backward Citations)
US3245142A
Cited
DE2935384A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-15 | 1988-10-15 | 1989-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-15 | 1992-10-15 | 1993-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-15 | 1996-10-15 | 1997-04-16 | $7700.00 | Window Closed / Lapsed |