Motorcycle fuel system with flow from a main tank through a lower auxiliary tank to its engine

• US 4,577,719 A
• Filed: 12/12/1984
• Issued: 03/25/1986
• Est. Priority Date: 06/29/1979
• Status: Expired due to Term

• Current Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Original Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Inventors: Kazuta, Hisashi, Nomura, Kazuhiko, Kimura, Hiroshi
• Primary Examiner(s): Peters, Jr., Joseph F.
• Assistant Examiner(s): Hill, Mitchell J.
• Application Number:
  US06/680,745
• Time in Patent Office: 468 Days
• Field of Search: 180/219, 280/5 A, 280/289 R, 280/289 A, 297/193, 297/195
• US Class Current: 180/219
• CPC Class Codes: B62J 1/12 Box-shaped seats; Bench-type seats, e.g. dual or twin seats
• CPC Class Codes: B62J 35/00 Fuel tanks specially adapted for motorcycles or engine-assisted cycles; Arrangements thereof fuel tanks forming part of cycle frames B62K11/00; tanks in general B60K ; closure caps for fuel tanks B60K15/0406
• CPC Class Codes: F02B 2075/027 four
• CPC Class Codes: F02B 2075/1808 two
• CPC Class Codes: F02B 61/02 for driving cycles
• CPC Class Codes: F02B 75/22 with cylinders in V, fan, or star arrangement

Abstract

In a motorcycle having a main frame, a seat support on the frame, and a seat mounted to the seat support. The seat support is at least partially separable from the main frame so as to provide ready access to stored items or for maintenance and repair of motorcycle elements beneath the seat. The seat support is made separable by separable fasteners, or by hinges or pivot pins. The seat support can also serve as the mount for a rear fender. It can be made in a monocoque configuration for improved rigidity, and even for storage such as for a fuel tank.

Claims

1. In combination with a motorcycle which has a main frame and an engine mounted to said frame, a fuel supply system for said engine comprising:

an upper main tank having a filler neck for filling the same, and a lower outlet port;

a separate auxiliary tank disposed at a lower elevation than said main tank, said auxiliary tank having an upper inlet port and a lower outlet port, both of said tanks being mounted to said motorcycle;

first conduit means connecting the outlet port of said main tank to the inlet port of said auxiliary tank; and

a second conduit means connecting the outlet port of said auxiliary tank to said engine, whereby fuel flow is from said main tank through said auxiliary tank to said engine.

2. Apparatus according to claim 1 in which a seat supporting frame is pivotally mounted to said main frame, and in which said auxiliary tank is mounted to said seat supporting frame.

3. Apparatus according to claim 2 in which said first conduit is flexible, whereby to bend when the seat supporting frame is pivotally moved.