US3859965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine with silencing means
Assignee: Motorenfabrik Hatz GmbH and Co KG
•
Filing: 1973-05-08
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Granted: 1975-01-14
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Expires: 1993-05-08
Abstract
Abstract In an internal combustion engine of the type having a closed cooling air conducting system associated with the engine cylinder or cylinders, a cooling air blower in the system, sound muffling means associated with the system, and an air filter through which combustion air is introduced to the cylinder or cylinders, long sound deadening channels are provided without a simultaneous increase in the overall constructional size of the engine. The inlet side of the conducting system is made of a maximum length utilizing the free-space which is available at the outer side of the engine, the filter is fastened from the exterior to a wall of the conducting system to receive air from the interior of the conducting system, the suction tube of the cylinder or cylinders is arranged within the conducting system to communicate with the discharge of the air filter, and the exit side of the conducting system is made of maximum length by utilizing the free space available at the outer side of the engine, and surrounds the exhaust conduit of the cylinder or cylinders.
Inventors
- 👤 Ernst Hatz
- 👤 Johann Schmuck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:42
CPC Classifications
F; F02; F02B; F02B77/00; F02B77/11; F02B77/13; F01; F01P; F01P1/00; F01P1/02; F02M; F02M35/00; F02M35/12; F02M35/1205; F02M35/1227; F02M35/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
240 words
In an internal combusion engine having a row of cylinders, combustion air intake and discharge pipes, and a closed coolant air conduit system that includes an air fan, with which conduit system noise damping means are associated, the combustion air being introduced via an air filter, the improvements wherein the intake side of the conduit system includes a relatively long duct arranged along, laterally of and above the cylinder heads of the row of cylinders, the intake opening of the duct being at a first end of the row and the discharge end of the duct leading to the fan, said fan being arranged at the other end of said row and being connected with the air filter at the first end of the row by a passage defined by a guide plate lying laterally beside and along the row of cylinders, said filter receiving coolant air and leading it to the combustion air intake pipe of the engine, whereby the damping length on said intake side is at least as long as the row of cylinders, the discharge side of the conduit system including a flat channel disposed closely adjacent and along the row of cylinders and cylinder heads and extending downwardly along and adjacent the crankcase of the engine, said flat channel also surrounding the combustion exhaust pipe of the engine, such that the damping passage on the discharge side is approximately of the height of the engine.
Claim 2
Dependent Claim
240 words
In an internal combusion engine having a row of cylinders, combustion air intake and discharge pipes, and a closed coolant air conduit system that includes an air fan, with which conduit system noise damping means are associated, the combustion air being introduced via an air filter, the improvements wherein the intake side of the conduit system includes a relatively long duct arranged along, laterally of and above the cylinder heads of the row of cylinders, the intake opening of the duct being at a first end of the row and the discharge end of the duct leading to the fan, said fan being arranged at the other end of said row and being connected with the air filter at the first end of the row by a passage defined by a guide plate lying laterally beside and along the row of cylinders, said filter receiving coolant air and leading it to the combustion air intake pipe of the engine, whereby the damping length on said intake side is at least as long as the row of cylinders, the discharge side of the conduit system including a flat channel disposed closely adjacent and along the row of cylinders and cylinder heads and extending downwardly along and adjacent the crankcase of the engine, said flat channel also surrounding the combustion exhaust pipe of the engine, such that the damping passage on the discharge side is approximately of the height of the engine.
Claim 3
Dependent Claim
53 words
A combustion engine as claimed in claim 1, further including a flywheel seated on the crankshaft of the engine, the intake opening of said relatively long duct being provided on the flywheel end of the engine, and the air filter being removably fixed from the outside on a wall of the conduit system.
Claim 4
Dependent Claim
30 words
A combustion engine as claimed in claim 1, wherein noise damping means comprising at least one layer of rock wool is disposed on all inner walls of said conduit system.
Claim 5
Dependent Claim
36 words
A combustion engine as claimed in claim 3, wherein said air fan is enclosed by the conduit system and is also covered on its housing walls with a layer of rock wool for additional noise damping.
References Cited (Backward Citations)
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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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |