Jet propulsion boat

Patent metadata

Field	Value
Publication number	US-9193425-B2
Application number	US-201313891217-A
Country	US
Kind code	B2
Filing date	May 10, 2013
Priority date	Oct 5, 2012
Publication date	Nov 24, 2015
Grant date	Nov 24, 2015

Abstract

A jet propulsion boat includes a boat body, an engine, a jet propulsion mechanism, and a reverse gate. The reverse gate is arranged rearward of the jet propulsion mechanism and is configured to move to a forward movement position that allows a jet flow from the jet propulsion mechanism to flow backward, a reverse movement position that allows the jet flow from the jet propulsion mechanism to flow forward and downward, and a neutral position that allows the jet flow from the jet propulsion mechanism to flow in the lateral direction. The reverse gate includes a first member and a second member. The first member includes a downward opening and a pair of lateral openings open to the right and left when the reverse gate is positioned in the neutral position. The second member covers at least a portion of the downward opening when the reverse gate is positioned in the neutral position.

First claim

What is claimed is:

1. A jet propulsion boat comprising:
a boat body;
an engine housed in the boat body;
a jet propulsion mechanism arranged to generate a propulsion power based on a driving power from the engine; and
a reverse gate arranged rearward of the jet propulsion mechanism, the reverse gate arranged to be moved to a forward movement position that allows a jet flow from the jet propulsion mechanism to flow backward, a reverse movement position that allows the jet flow from the jet propulsion mechanism to flow forward and downward, and a neutral position that allows the jet flow from the jet propulsion mechanism to flow in a lateral direction; wherein
the reverse gate includes a first member and a second member;
the first member includes a downward opening and a pair of lateral openings, the downward opening opens downward and the pair of lateral openings open to a right side and to a left side when the reverse gate is positioned in the neutral position; and
the second member covers at least a portion of the downward opening when the reverse gate is positioned in the neutral position.

2. The jet propulsion boat according to claim 1 , wherein the second member is arranged outside of the first member.

3. The jet propulsion boat according to claim 1 , wherein the second member includes a jet flow restraint wall which covers at least a portion of the downward opening when the reverse gate is in the neutral position.

4. The jet propulsion boat according to claim 3 , wherein the jet flow restraint wall allows the downward opening to be open when the reverse gate is in the reverse movement position.

5. The jet propulsion boat according to claim 4 , wherein the first member includes a pair of side plates and a back plate;
the pair of lateral openings are provided in the pair of side plates;
the back plate faces the jet propulsion mechanism when the reverse gate is in the reverse movement position; and
a lower end of the jet flow restraint wall is positioned below and forward of a lower end of the back plate and is positioned forward of an upper end of the jet flow restraint wall when the reverse gate is positioned in the reverse movement position.

6. The jet propulsion boat according to claim 4 , wherein the first member includes a pair of side plates and a back plate;
the pair of lateral openings are provided in the pair of side plates;
the back plate faces the jet propulsion mechanism when the reverse gate is in the reverse movement position;
the second member includes a back wall including a lower end and an upper end;
the lower end of the back wall is positioned forward of the upper end when the reverse gate is in the reverse movement position; and
the lower end of the back wall is positioned forward of a lower end of the back plate when the reverse gate is in the reverse movement position.

7. The jet propulsion boat according to claim 1 , wherein the second member includes a pair of lateral walls, and the pair of lateral walls cover at least a portion of the pair of lateral openings when the reverse gate is in the reverse movement position.

8. The jet propulsion boat according to claim 1 , wherein the second member is pivotably attached to the first member.

9. The jet propulsion boat according to claim 1 , wherein the first member includes an upward opening, and the upward opening is open upward when the reverse gate is in the neutral position.

10. The jet propulsion boat according to claim 9 , wherein the second member includes an upper wall, and the upper wall covers at least a portion of the upward opening when the reverse gate is in the reverse movement position.

11. The jet propulsion boat according to claim 9 , wherein the boat body includes a flow rectifying portion, the flow rectifying portion is tapered downward in a center of the boat body in the lateral direction, and the flow rectifying portion divides a water flow flowing toward the boat body from the upward opening to the right side and to the left side.

Assignees

• Yamaha Motor Co Ltd

Inventors

• Kaneko Yoshiyuki
• Suzuki Masaru

Classifications

• B63H2021/216

  using electric control means · CPC title

• B63H11/11 Primary

  with bucket or clamshell-type reversing means · CPC title

• B63H11/08 Primary

  of rotary type · CPC title

• B63H21/21

  Control means for engine or transmission, specially adapted for use on marine vessels · CPC title