US4813232A — Exhaust device for internal combustion engine

Claim 1

Independent Claim 112 words

An exhaust device for an internal combustion engine having a plurality of cylinders with respective exhaust ports, said exhaust device comprising: a plurality of independent passages having upstream ends for connection to respective exhaust ports of respective of the cylinders and downstream ends joined together at at least one junction; and communicating passage means for connecting at least some of said independent passages at positions upstream of said junction, said communicating passage means including a long passage connecting at least those of said independent passages the respective cylinders of the engine of which are spaced the furthest from each other and have exhaust strokes that substantially do not overlap with each other.

Claim 2

Dependent Claim 112 words

An exhaust device for an internal combustion engine having a plurality of cylinders with respective exhaust ports, said exhaust device comprising: a plurality of independent passages having upstream ends for connection to respective exhaust ports of respective of the cylinders and downstream ends joined together at at least one junction; and communicating passage means for connecting at least some of said independent passages at positions upstream of said junction, said communicating passage means including a long passage connecting at least those of said independent passages the respective cylinders of the engine of which are spaced the furthest from each other and have exhaust strokes that substantially do not overlap with each other.

Claim 3

Dependent Claim 56 words

A device as claimed in claim 1, wherein said communicating passage means comprises plural passages, said long passage comprising one of said plural passages, and each of said plural passages connects a group of said independent passages the respective cylinders of the engine of which have exhaust strokes that substantially do not overlap with each other.

Claim 4

Dependent Claim 47 words

A device as claimed in claim 1, wherein the distance between the connection of said long passage to each said independent passage and said first end of said independent passage is less than 50% of the distance between said first and second ends of said independent passage.

Claim 5

Dependent Claim 35 words

A device as claimed in claim 1, for use in a naturally aspirated engine, wherein said long passage has an equivalent diameter of more than 25% of an equivalent diameter of each said independent passage.

Claim 6

Dependent Claim 32 words

A device as claimed in claim 1, wherein said long passage is formed in a double wall member defining a space for circulating cooling water from a cylinder head of the engine.

Claim 7

Dependent Claim 35 words

A device as claimed in claim 1, wherein each cylinder of the engine includes plural exhaust valves, and said long passage is to be positioned closer to an earliest opening of the plural exhaust valves.

Claim 8

Dependent Claim 34 words

A device as claimed in claim 1, wherein said long passage permits the flow therethrough of exhaust gases from said those independent passages without interaction with exhaust gases from other of said independent passages.

Claim 9

Dependent Claim 32 words

A device as claimed in claim 1, wherein said long passage has a substantially uniform dimension throughout the entire length thereof and includes branches bifurcating from the least said those independent passages.

Claim 10

Dependent Claim 53 words

A device as claimed in claim 1, for use in a four-cylinder engine, wherein said long passage connects said independent passages for the first and fourth cylinders of the engine, and said communicating passage means further comprises a short passage connecting said independent passages of the second and third cylinders of the engine.

Claim 11

Independent Claim 25 words

A device as claimed in 1, wherein said communicating passage means connects only said those independent passages without connection to other of said independent passages.

Claim 12

Dependent Claim 119 words

An exhaust device for use in an internal combustion engine having a plurality of cylinders with respective exhaust ports and having an exhaust turbo-supercharger, said exhaust device comprising: a plurality of independent passages having upstream ends for connection to respective exhaust ports of respective of the cylinders and downstream ends joined together at at least one junction; and communicating passage means for connecting at least some of said independent passages at positions upstream of said junction, said communicating passage means including a long passage connecting at least those of said independent passages the respective cylinders of the engine of which are spaced the furthest from each other and have exhaust strokes that substantially do not overlap with each other.

Claim 13

Dependent Claim 119 words

An exhaust device for use in an internal combustion engine having a plurality of cylinders with respective exhaust ports and having an exhaust turbo-supercharger, said exhaust device comprising: a plurality of independent passages having upstream ends for connection to respective exhaust ports of respective of the cylinders and downstream ends joined together at at least one junction; and communicating passage means for connecting at least some of said independent passages at positions upstream of said junction, said communicating passage means including a long passage connecting at least those of said independent passages the respective cylinders of the engine of which are spaced the furthest from each other and have exhaust strokes that substantially do not overlap with each other.

Claim 14

Dependent Claim 31 words

A device as claimed in claim 11, wherein said independent passages are combined at said junction to form two extensions for separately leading exhaust gases to a turbine of the turbo-supercharger.

Claim 15

Dependent Claim 31 words

A device as claimed in claim 11, wherein at least one of said independent passages for a cylinder located close to the turbo-charger is not connected to said communicating passage means.

Claim 16

Dependent Claim 31 words

A device as claimed in claim 13, wherein said independent passages connected to said communicating passage means have a diameter smaller than the diameter of said at least one independent passage.

Claim 17

Dependent Claim 34 words

A device as claimed in claim 11, wherein the exhaust turbosupercharger includes two separately arranged turbines, and said independent passages are arranged in two groups for leading exhaust gases to respective of the turbines.

Claim 18

Dependent Claim 38 words

A device as claimed in claim 11, wherein said communicating passage means includes valve means for controlling the communication between said independent passages, said valve means being opened for achieving communication in high-speed and high loaded engine conditions.

Claim 19

Dependent Claim 34 words

A device as claimed in claim 16, wherein said valve means comprises a plurality of valves each mounted at a position where a respective said independent passage is connected to said communicating passage means.

Claim 20

Dependent Claim 24 words

A device as claimed in claim 16, wherein said valve means comprises a single valve mounted in the middle of said communicating passage means.

Claim 21

Dependent Claim 15 words

A device as claimed in claim 16, wherein said valve means comprises a rotary valve.

Claim 22

Dependent Claim 20 words

A device as claimed in claim 16, wherein said valve means comprises a swing valve pivoted at one end thereof.

Claim 23

Dependent Claim 28 words

A device as claimed in claim 11, wherein said communicating passage means has an equivalent diameter of more than 50% of an equivalent diameter of said independent passages.

Claim 24

Dependent Claim 56 words

A device as claimed in claim 11, wherein said communicating passage means comprises plural passages, said long passage comprising one of said plural passages, and each of said plural passages connects a group of said independent passages the respective cylinders of the engine of which have exhaust strokes that substantially do not overlap with each other.

Claim 25

Dependent Claim 47 words

A device as claimed in claim 11, wherein the distance between the connection of said long passage to each said independent passage and said first end of said independent passage is less than 50% of the distance between said first and second ends of said independent passage.

Claim 26

Dependent Claim 32 words

A device as claimed in claim 11, wherein said long passage is formed in a double wall member defining a space for circulating cooling water from a cylinder head of the engine.

Claim 27

Dependent Claim 35 words

A device as claimed in claim 11, wherein each cylinder of the engine includes plural exhaust valves, and said long passage is to be positioned closer to an earliest opening of the plural exhaust valves.

Claim 28

Dependent Claim 34 words

A device as claimed in claim 11, wherein said long passage permits the flow therethrough of exhaust gases from said those independent passages without interaction with exhaust gases from other of said independent passages.

Claim 29

Dependent Claim 32 words

A device as claimed in claim 11, wherein said long passage has a substantially uniform dimension throughout the entire length thereof and includes branches bifurcating from at least said those independent passages.

Claim 30

Dependent Claim 53 words

A device as claimed in claim 11, for use in a four-cylinder engine, wherein said long passage connects said independent passages for the first and fourth cylinders of the engine, and said communicating passage means further comprises a short passage connecting said independent passages of the second and third cylinders of the engine.

Claim 31

Dependent Claim 26 words

A device as claimed in claim 11, wherein said communicating passage means connects only said those independent passages without connection to other of said independent passages.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1992-03-20	1992-09-19	1993-03-21	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1996-03-20	1996-09-19	1997-03-21	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2000-03-20	2000-09-19	2001-03-21	$7700.00	Window Closed / Lapsed

Exhaust device for internal combustion engine

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