Intake noise reduction device and straddle-type vehicle including the same

Patent metadata

Field	Value
Publication number	US-9382883-B2
Application number	US-201514728351-A
Country	US
Kind code	B2
Filing date	Jun 2, 2015
Priority date	Jun 3, 2014
Publication date	Jul 5, 2016
Grant date	Jul 5, 2016

Abstract

An intake noise reduction device includes an air cleaner, an intake funnel and a resonator, and is connected to an engine via a throttle body. The resonator is provided inside of the air cleaner. The resonator includes a chamber portion and a pipe portion. The pipe portion is formed to extend downward from the chamber portion, and has an opening end at a lower end. The intake funnel is provided at a lower end of the air cleaner. An opening end of the resonator is inserted into the intake funnel. A cross sectional area of an intake passage between the intake funnel and the pipe portion is set to not less than an opening area of an intake passage of the throttle body opened to a maximum throttle opening.

First claim

We claim:

1. An intake noise reduction device that leads air to an engine, comprising:
an air cleaner;
an intake funnel having an upstream opening positioned in the air cleaner;
a throttle body provided between a downstream opening of the intake funnel and an intake port of the engine; and
a resonator having a chamber portion and a pipe portion, the resonator being arranged in the air cleaner such that an opening end of the pipe portion is inserted into the intake funnel, and
a cross-sectional area of a passage formed between an inner peripheral surface of the intake funnel and an outer peripheral surface of the pipe portion is set to be not less than an opening area of an intake passage of the throttle body opened to a maximum throttle opening.

2. The intake noise reduction device according to claim 1 , wherein the air cleaner includes
a filter element, and
a casing that stores the filter element,
wherein the intake noise reduction device further comprises a support member that supports the filter element on the casing at a position further upstream than the intake funnel, and
further wherein the chamber portion of the resonator is provided at a position further downstream than the filter element.

3. The intake noise reduction device according to claim 2 , wherein the chamber portion of the resonator has an attachment portion attached to the support member.

4. The intake noise reduction device according to claim 3 , wherein the attachment portion includes a plate-shape member provided to close part of a space located at a position further downstream than the filter element.

5. The intake noise reduction device according to claim 1 , wherein the resonator has a projection projecting outward of the upstream opening of the intake funnel.

6. The intake noise reduction device according to claim 5 , wherein a lower edge of the projection is formed to extend outward from the pipe portion.

7. A straddle-type vehicle including:
an engine;
a drive wheel rotated by motive power generated by the engine; and
an intake noise reduction device that leads air to the engine, including
an air cleaner,
an intake funnel having an upstream opening positioned in the air cleaner,
a throttle body provided between a downstream opening of the intake funnel and an intake port of the engine, and including an intake passage,
a resonator having a chamber portion and a pipe portion, the resonator being arranged in the air cleaner such that an opening end of the pipe portion is inserted into the intake funnel,
a connecting passage formed between an inner peripheral surface of the intake funnel and an outer peripheral surface of the pipe portion, the connecting passage having a cross-sectional area not less than an opening area of the intake passage of the throttle body opened to a maximum throttle opening.

8. The straddle-type vehicle according to claim 7 , further comprising:
a head pipe;
a main frame that extends in a rearward direction of the vehicle from the head pipe; and
a down frame that obliquely extends rearward and downward from the head pipe at a position below the main frame, wherein
the air cleaner is supported at a front portion of the main frame,
the engine is held by the main frame at a position below the air cleaner, and
the intake funnel and the throttle body are arranged along the down frame behind the down frame.

Assignees

• Yamaha Motor Co Ltd

Inventors

• Nishizawa Kazuya
• Ueno Hisahide
• Terada Takuji

Classifications

• F02M35/1255 Primary

  using resonance · CPC title

• B62M7/04

  below the frame · CPC title

• F02M35/10118

  with variable cross-sections of intake ducts along their length; Venturis; Diffusers · CPC title

• F02M35/162

  Motorcycles; All-terrain vehicles, e.g. quads, snowmobiles; Small vehicles, e.g. forklifts · CPC title

• F02M35/02425

  Support structures increasing the stability or stiffness of the filter element · CPC title