Snowmobile

Patent metadata

Field	Value
Publication number	US-9845004-B2
Application number	US-201514607688-A
Country	US
Kind code	B2
Filing date	Jan 28, 2015
Priority date	Jan 10, 2014
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

A snowmobile includes a chassis, an engine positioned in a front chassis portion and having at least one intake port and at least one exhaust port, an air intake system coupled to the intake port and comprising a duct being at least partially comprised of a porous material, and an exhaust system comprising an exhaust pipe having a stinger tube and a rear cone which are curved, with centerlines of the stinger tube and rear cone being concentric.

First claim

The invention claimed is:

1. A snowmobile, comprising:
a chassis;
an engine positioned in a front chassis portion and having at least one intake port and at least one exhaust port;
an air intake system coupled to the intake port and comprising a duct being at least partially comprised of a porous material; and
an exhaust system comprising an exhaust pipe having a stinger tube and a rear cone which are curved, with centerlines of the stinger tube and rear cone being concentric, and the rear cone includes an expansion chamber having a first diameter, an inlet having a second diameter which is less than the first diameter, and an outlet with a third diameter which is less than the first diameter, and the stinger tube extends from the outlet into the expansion chamber, and the expansion chamber is positioned intermediate the inlet and the outlet of the rear cone, and the stinger tube includes an inlet and an outlet, and the inlet is positioned adjacent the expansion chamber and the outlet of the stinger tube is coupled to the outlet of the rear cone, and the stinger tube has a substantially constant diameter extending between the inlet and the outlet.

2. The snowmobile of claim 1 , wherein the exhaust pipe further comprises a diffuser.

3. The exhaust pipe of claim 1 , wherein the stinger and rear cone have a single radius bend.

4. The exhaust pipe of claim 1 , wherein the stinger and rear cone have a compound, multi-dimensional bend.

5. The snowmobile of claim 1 , wherein a front body portion is defined over a front chassis portion and defines an engine compartment.

6. The snowmobile of claim 5 , wherein a plenum assembly is coupled to the front chassis portion and having at least one intake air vent and at least one air exit opening.

7. The snowmobile of claim 5 , wherein the plenum assembly is defined at least in part by the front body portion.

8. The snowmobile of claim 7 , wherein the front body portion comprises at least one upper body panel, rear panel, side panel and hood.

9. The snowmobile of claim 8 , wherein the plenum is defined by an upper plenum housing and a lower plenum housing.

10. The snowmobile of claim 9 , wherein the upper body panel defines a top wall of the upper plenum housing.

11. The snowmobile of claim 1 , further comprising a second duct and an air box, the second duct being coupled to the first duct, and to the air box.

12. The snowmobile of claim 11 , wherein the air box includes an air filter.

13. The snowmobile of claim 1 , wherein the first duct includes a composite of a molded plastic portion and the porous material.

14. The snowmobile of claim 13 , wherein the porous material has a porosity in the range of 20-40%.

15. The snowmobile of claim 14 , wherein the porous material has a porosity of approximately 30%.

16. An exhaust pipe, comprising:
a rear cone, and
a stinger tube extending into the rear cone, wherein the stinger tube and rear cone are curved, with centerlines of the stinger tube and rear cone being concentric, and the rear cone includes an expansion chamber having a first diameter, an inlet having a second diameter which is less than the first diameter, and an outlet with a third diameter which is less than the first diameter, and the stinger tube extends from the outlet into the expansion chamber, and the expansion chamber is positioned intermediate the inlet and the outlet of the rear cone, and the stinger tube includes an inlet and an outlet, and the inlet is positioned adjacent the expansion chamber and the outlet of the stinger tube is coupled to the outlet of the rear cone, and the stinger tube has a substantially constant diameter extending between the inlet and the outlet.

17. The exhaust pipe of claim 16 , wherein the stinger and rear cone have a single radius bend.

18. The exhaust pipe of claim 16 , wherein the stinger and rear cone have a compound, multi-dimensional bend.

19. A snowmobile comprising the exhaust pipe of claim 16 .

20. The snowmobile of claim 19 , further comprising an air intake system coupled to the intake port and comprising a duct being at least partially comprised of a porous material.

21. The snowmobile of claim 1 , wherein the stinger tube defines a first flow path and the rear cone defines a second flow path, and the first and second flow paths are curved.

Assignees

• Polaris Inc

Inventors

• Hedlund Darren J
• Vistad Jan R
• Mertens Dustin A
• Mills Andrew J

Classifications

• B62M2027/028

  Snow mobiles characterised by chassis or bodywork · CPC title

• B62M2027/023

  Snow mobiles characterised by engine mounting arrangements · CPC title

• B62M27/02

  power driven · CPC title

• B60Y2200/252

  Snowmobiles · CPC title

• B60K13/04

  concerning exhaust · CPC title