Frame for two-wheeled vehicle

• US 4,327,930 A
• Filed: 03/11/1980
• Issued: 05/04/1982
• Est. Priority Date: 03/19/1979
• Status: Expired due to Term

• Current Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Original Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Inventors: Ueno, Hajime, Kurai, Nobuyoshi, Tominaga, Nobuyoshi, Suzuki, Sadahide
• Primary Examiner(s): Pekar, John A.
• Application Number:
  US06/129,329
• Time in Patent Office: 784 Days
• Field of Search: 280/284, 280/227, 280/226, 180/227
• US Class Current: 280/284
• CPC Class Codes: B62K 11/04 characterised by the engine being between front and rear wheels

Abstract

A frame for a two-wheeled vehicle such as a motorcycle or a power-driven cycle or a bicycle which has a bifurcated rear portion that forms a chamber to receive a suspension member. The suspension member interlinks the frame and an upper portion of a rear arm that has pivot points for the joinder to the suspension, for the frame, and for the rear wheel.

Claims

1. In a two-wheeled vehicle including a main frame, a rear arm which is generally triangular in side elevation, said rear arm having a front end pivotally connected to said main frame, and a suspension mounted between the top of said rear arm and said main frame, said main frame comprising a pair of horizontally opposed metal plate members joined together at their forward portions and diverging from one another from a mid-portion to their rear portions, whereby to form a bifurcated portion;

and a generally V-shaped inner plate bent aroung generally upright axes covering the insides of said metal plate members where they diverge, said metal plate members being continuously welded to one another in said formed portion, and to said inner plate where they diverge from one another, whereby said inner plate reinforces said frame where the metal plate members diverge, and forms, therewithin a chamber in which said suspension is mounted.

2. Apparatus according to claim 1 including said suspension means connected to said inner plate, and said rear arm pivotally mounted to said main frame and pivotally connected to said suspension means to cause said suspension means to shorten and elongate as said rear arm deflects up and down.

3. Apparatus according to claim 1 in which said metal plate members are bulged sidewardly, and joined at their edges to each other and to the inner plate, whereby to form a hollow frame.