Body frame of motorcycle

Abstract

A body frame for a motorcycle for ensuring the binding rigidity between an engine and a body frame while reducing the weight of the body frame, and also increasing the flexibility of the disposition of motorcycle components. A body frame includes a first frame member and a second frame member, the first frame member and the second frame member being separated relative to each other. At least one engine support is formed integrally with the first frame member. Another engine support and a pivot portion for a rear swing arm is integrally formed with the second frame member. The first frame member gradually expands towards the at least one engine support with three approximately M-shaped projections being formed at an end of the first frame member wherein the at least one engine support is formed at these projections.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:

FIG. 1 is a side view illustrating the body frame of a motorcycle according to the present invention;

FIG. 2 is a diagram as viewed from 2 in FIG. 1;

FIG. 3 is a side view of the substantial part of body frame for the motorcycle according to the present invention;

FIG. 4 is a cross-section view taken along 4-4 in FIG. 3; and

FIG. 5 is a modification of the embodiment in FIG. 2.

Claims

1. A body frame for a motorcycle comprising: a first frame member and a second frame member, the first frame member and the second frame member being separated relative to each other;the first frame member extending from a head pipe to a crankcase of an engine, said first frame member being formed integrally with at least one engine support;the second frame member being disposed at a rear of the engine, said second frame member being formed integrally with at least one engine support; anda pivot portion of a rear swing arm being operatively mounted relative to the second frame member;the first frame member gradually expands toward the at least one engine support wherein approximately M-shaped projections are formed at an end of the first frame member, and the at least one engine support is formed at these projections.

2. The body frame for a motorcycle according to claim 1, wherein the engine is a multiple-cylinder engine including a front cylinder and a rear cylinder; the first frame member gradually expands toward the at least one engine support, and three approximately M-shaped projections are formed at the end of the first frame member; anda front projection of these projections supports the front portion of the front cylinder, a center projection supports the portion between the front cylinder and the rear cylinder, and a rear projection supports the rear portion of the rear cylinder.

3. The body frame for a motorcycle according to claim 1, wherein the at least one engine support of the first frame member is operatively connected to the engine and the at least one engine support of the second frame member is operatively connected to the engine for forming the body frame from the first frame member, the engine and the second frame member.

4. The body frame for a motorcycle according to claim 1, wherein the second frame member includes a cross member having an upwardly formed recess therein, and further including a muffler operatively connected to said engine wherein said muffler projects upwardly and is partially disposed within said upwardly formed recess.

5. The body frame for a motorcycle according to claim 4, wherein said cross member further includes an downwardly formed recess and further including a power transmission member operatively connected between the engine and a rear wheel wherein said power transmission member is accommodated within said downwardly formed recess formed in said cross member.

6. The body frame for a motorcycle according to claim 2, wherein the three approximately M-shaped projections are secured directly to the engine for reducing the weight and increasing the rigidity of the body frame.

7. The body frame for a motorcycle according to claim 1, wherein the engine is a multiple-cylinder engine including a front cylinder and a rear cylinder; the first frame member gradually expands toward the at least one engine support, and three approximately W-shaped projections are formed at the end of the first frame member; anda front projection of these projections supports the front portion of the front cylinder, a center projection supports the portion between the front cylinder and the rear cylinder, and a rear projection supports the rear portion of the rear cylinder.

8. A body frame for a motorcycle comprising: a first frame member and a second frame member, the first frame member and the second frame member being separated relative to each other;the first frame member extending from a head pipe to a crankcase of an engine and being formed integrally with at least one engine support;the second frame member extending from the rear portion of the engine toward the rear of the engine, said second frame member being formed integrally with other engine support; anda pivot portion of a rear swing arm being operatively mounted relative to the second frame member;wherein the engine is a multiple-cylinder engine comprising a front cylinder and a rear cylinder;the at least one engine support supports at least a front portion of the front cylinder, a rear portion of the rear cylinder, and a portion between the front cylinder and the rear cylinder.

9. The body frame for a motorcycle according to claim 8, wherein the first frame member gradually expands toward the at least one engine support, and three approximately M-shaped projections are formed at the end of the first frame member; and a front projection of these projections supports the front portion of the front cylinder, a center projection supports the portion between the front cylinder and the rear cylinder, and a rear projection supports the rear portion of the rear cylinder.

10. The body frame for a motorcycle according to claim 8, wherein the at least one engine support of the first frame member is operatively connected to the engine and the at least one engine support of the second frame member is operatively connected to the engine for forming the body frame from the first frame member, the engine and the second frame member.

11. The body frame for a motorcycle according to claim 8, wherein the second frame member includes a cross member having an upwardly formed recess therein, and further including a muffler operatively connected to said engine wherein said muffler projects upwardly and is partially disposed within said upwardly formed recess.

12. The body frame for a motorcycle according to claim 11, wherein said cross member further includes an downwardly formed recess and further including a power transmission member operatively connected between the engine and a rear wheel wherein said power transmission member is accommodated within said downwardly formed recess formed in said cross member.

13. The body frame for a motorcycle according to claim 9, wherein the three approximately M-shaped projections are secured directly to the engine for reducing the weight and increasing the rigidity of the body frame.

14. The body frame for a motorcycle according to claim 8, wherein the first frame member gradually expands toward the at least one engine support, and three approximately W-shaped projections are formed at the end of the first frame member; and a front projection of these projections Supports the front portion of the front cylinder, a center projection supports the portion between the front cylinder and the rear cylinder, and a rear projection supports the rear portion of the rear cylinder.

15. A body frame for a motorcycle comprising: a first frame member and a second frame member, the first frame member and the second frame member being separated relative to each other;the first frame member extending from a head pipe to a crankcase of an engine and being formed integrally with at least one engine support;the second frame member extending from the rear portion of the engine toward the rear of the engine, said second frame member being formed integrally with another engine support;a pivot portion of a rear swing arm being operatively mounted relative to the second frame member;wherein the second frame member comprises left and right frame portions and a cross portion connecting the left and right frame portions is integrally formed below the pivot portion; anda first upwardly recessed portion formed at the bottom of the cross portion wherein a muffler can be passed through the first recessed portion.

16. The body frame for a motorcycle according to claim 15, wherein a second downwardly formed recessed portion is formed at the top of the cross portion wherein a power transmission member is passed through the second recessed portion.

17. The body frame for a motorcycle according to claim 15, wherein the engine is a multiple-cylinder engine including a front cylinder and a rear cylinder; the first frame member gradually expands toward the at least one engine support, and three approximately M-shaped projections are formed at the end of the first frame member; anda front projection of these projections supports the front portion of the front cylinder, a center projection supports the portion between the front cylinder and the rear cylinder, and a rear projection supports the rear portion of the rear cylinder.

18. The body frame for a motorcycle according to claim 15, wherein the at least one engine support of the first frame member is operatively connected to the engine and the at least one engine support of the second frame member is operatively connected to the engine for forming the body frame from the first frame member, the engine and the second frame member.

19. The body frame for a motorcycle according to claim 17, wherein the three approximately M-shaped projections are secured directly to the engine for reducing the weight and increasing the rigidity of the body frame.

20. The body frame for a motorcycle according to claim 15, wherein the engine is a multiple-cylinder engine including a front cylinder and a rear cylinder; the first frame member gradually expands toward the at least one engine support, and three approximately W-shaped projections are formed at the end of the first frame member; anda front projection of these projections supports the front portion of the front cylinder, a center projection supports the portion between the front cylinder and the rear cylinder, and a rear projection supports the rear portion of the rear cylinder.