VEHICLE BODY FRAME OF MOTORCYCLE

• US 20110278085A1
• Filed: 05/17/2011
• Published: 11/17/2011
• Est. Priority Date: 05/17/2010
• Status: Active Grant

• Current Assignee: Suzuki Motor Corporation
• Original Assignee: Suzuki Motor Corporation
• Inventors: YAGI, Toshiaki, HATANAKA, Akimasa, HORI, Naoto
• Granted Patent: US 8,550,200 B2
• Time in Patent Office: Days
• US Class Current: 180/219
• CPC Class Codes: B62K 11/04 characterised by the engine being between front and rear wheels

Abstract

A motorcycle having a vehicle body and a vehicle body frame. The vehicle body frame includes a head pipe; a pair of left and right tank rail portions including a widening portion having a width increasing in a vehicle width direction extending rearward of the vehicle from the head pipe, a parallel portion having a substantially fixed width, and a narrowing portion having a width decreasing the vehicle width direction, the widening portion, the parallel portion and the narrowing portion extend along left and right sides of the vehicle body of a motorcycle; and a pair of left and right rear arm bracket portions bending and extending from rear ends of the tank rail portions. The vehicle body frame has a front frame part and a rear frame part connected through a frame connecting surface substantially perpendicular to an axial direction of the parallel portion.

Claims

1. A vehicle body frame of a motorcycle comprising:

a head pipe;

a pair of left and right tank rail portions including a widening portion having a width increasing in a vehicle width direction, on a plan view of a vehicle, extending rearward of the vehicle from the head pipe, a parallel portion having a substantially fixed width in the vehicle width direction, and a narrowing portion having a width decreasing the vehicle width direction, the widening portion, the parallel portion and the narrowing portion subsequently extending along left and right sides of the vehicle body of a motorcycle, respectively; and

a pair of left and right rear arm bracket portions bending and extending from rear ends of the tank rail portions, respectively,

wherein the vehicle body frame is constituted by a front frame part and a rear frame part connected through a frame connecting surface substantially perpendicular to an axial direction of the parallel portion.

2. The vehicle body frame of a motorcycle according to claim 1, further comprising:

an engine suspension stay portion provided substantially downward from the tank rail portion across the front frame part and the rear frame part, the engine suspension stay portion being provided with a front engine suspension portion so as to support a front portion of an engine of the motorcycle,

wherein the engine suspension stay portion includes a front stay part and a rear stay part connected through a stay connecting surface, and the front engine suspension portion is disposed to the front stay portion.

3. The vehicle body frame of a motorcycle according to claim 2, wherein the engine suspension stay portion is a frame member having an inverted triangular shape including the tank rail portion on one side, the front engine suspension portion is disposed in a vicinity of a vertex of the inverted triangular shape, and the stay connecting surface is disposed in a vicinity of the front engine suspension portion.

4. The vehicle body frame of a motorcycle according to claim 2, wherein the front stay part and the rear stay part are integrally formed with the front frame part and the rear frame part, respectively.

5. The vehicle body frame of a motorcycle according to claim 3, wherein the front stay part is formed to be thicker than the rear stay part.