# US 6,719,084 B2 · Exhaust system for vehicular two-cylinder engine

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- Number: US 6,719,084 B2
- Document ID: US6719084B2
- Status: Granted
- Kind: B2
- Application number: 10/051,107
- Filed: 2002-01-22
- Published: 2002-07-25
- Granted: 2004-04-13
- Earliest claimed: 2001-01-23
- Assignees: Kawasaki Jukogyo Kabushiki Kaisha
- Inventors: Yasuhiro Kuji; Yuichi Kawamoto
- Web page: https://patentgrep.com/patent/US6719084B2

## CPC

- F01N 13/08: Other arrangements or adaptations of exhaust conduits {(pipes, joints or supports therefor in general F16L; collecting or removing exhaust gases of vehicle engines in workshops B08B15/00, on highways E01C1/005)}
- F01N 1/02: by using resonance
- F01N 1/089: {using two or more expansion chambers in series (F01N1/083, F01N1/084, F01N1/086 take precedence)}
- F01N 3/02: for cooling, or for removing solid constituents of, exhaust (by means of electric or electrostatic separators F01N3/01 {; mixing air with exhaust in tailpipes F01N13/082, F01N13/20})
- F01N 3/037: by means of inertial or centrifugal separators, e.g. of cyclone type, optionally combined or associated with agglomerators
- B60K 13/04: concerning exhaust
- F01N 2210/04: Throttling-expansion and resonance
- F01N 2340/04: Arrangement of the exhaust system relative to a vehicle or parts thereof
- F01N 2470/18: the axis of inlet or outlet tubes being other than the longitudinal axis of apparatus
- F01N 2590/04: for motorcycles
- Y02T 10/12: Improving ICE efficiencies
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

An exhaust system for a two-cylinder V-engine, having front and rear cylinders and mounted on a saddle-type all-terrain vehicle, includes a muffler disposed behind the two-cylinder V-engine and provided with two connecting openings, a front-cylinder exhaust pipe having one end connected to the exhaust port of the front cylinder, and a rear-cylinder exhaust pipe having one end connected to the rear cylinder. The front-cylinder exhaust pipe is bent so as to extend rearward along side surfaces of the front and the rear cylinders to the muffler and is detachably connected to the connecting opening. The rear-cylinder exhaust pipe is fitted in the other connecting opening and is welded to the muffler.

## Claims

### Claim 1

An exhaust system for a two-cylinder V-engine having a front cylinder and a rear cylinder and mounted on a saddle-type all-terrain vehicle, said exhaust system comprising:
a muffler disposed behind the two-cylinder V-engine;
a front-cylinder exhaust pipe having one end connected to a front cylinder, the front cylinder being tilted forward with respect to a moving direction of a vehicle;
a rear-cylinder exhaust pipe having one end connected to a rear cylinder, the rear cylinder being tilted rearward with respect to the moving direction of the vehicle; and
a crankcase on which the front cylinder and the rear cylinder are being held, the crankcase having a projected portion projected with respect to side surfaces of the front and the rear cylinders, a space being formed by an upper surface of the projected portion and the side surfaces of the front and the rear cylinders,
wherein the front-cylinder exhaust pipe is bent upwardly to pass through the space, and passes along the side surfaces of the front and the rear cylinders to the muffler.

### Claim 2 (depends on 1)

The exhaust system according to claim 1, wherein the muffler is provided with two connecting openings, the rear-cylinder exhaust pipe is connected to one of the connecting opening and is welded to the muffler, and the front-cylinder exhaust pipe is connected detachably to the other connecting opening.

### Claim 3

An exhaust system for a two-cylinder V-engine having a front cylinder and a rear cylinder and mounted on a saddle-type all-terrain vehicle, said exhaust system comprising:
a muffler disposed behind the two-cylinder V-engine;
a front-cylinder exhaust pipe having one end connected to a front cylinder, the front cylinder being disposed at a front portion with respect to a moving direction of a vehicle;
a rear-cylinder exhaust pipe having one end connected to a rear cylinder, the rear cylinder being disposed at a rear portion with respect to the moving direction of the vehicle; and
a crankcase on which the front cylinder and the rear cylinder are being held, the crankcase having a projected portion, wherein an upper surface of the projected portion and side surfaces of the front and the rear cylinders form a space,
wherein the front-cylinder exhaust pipe is bent upwardly to pass through the space, and passes along the side surfaces of the front and the rear cylinders to the muffler.

### Claim 4 (depends on 3)

The exhaust system according to claim 3, wherein the muffler is provided with two openings, the rear-cylinder exhaust pipe is connected to one of the openings and is welded to the muffler, and the front-cylinder exhaust pipe is connected detachably to the other opening.