Body frames for automatic two-wheeled vehicles

• US 4,727,953 A
• Filed: 05/29/1987
• Issued: 03/01/1988
• Est. Priority Date: 12/05/1984
• Status: Expired due to Term

• Current Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Original Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Inventors: Noguchi, Shusaku, Kurosawa, Tatsuo, Mizumachi, Shigeki, Kudo, Takashi, Takemura, Hiroo
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Watts, Charles R.
• Application Number:
  US07/056,293
• Time in Patent Office: 277 Days
• Field of Search: 180/219, 180/311, 180/312, 280/281 R, 280/274, 280/781
• US Class Current: 180/219
• CPC Class Codes: B62J 11/19 specially adapted for electric wires
• CPC Class Codes: B62K 11/04 characterised by the engine being between front and rear wheels
• CPC Class Codes: B62K 19/04 the material being wholly or mainly metallic, e.g. of high elasticity
• CPC Class Codes: B62K 19/30 Frame parts shaped to receive other cycle parts or accessories axle suspensions B62K25/00
• CPC Class Codes: B62M 7/04 below the frame

Abstract

A pair of main frames, which form an essential part of a body frame of a motorcycle, are fixed at the front ends to a head pipe, and extend toward the rear portion of a body at a given increasing interval. Each of the main frames includes therein a partition extending in the longitudinal direction.

Claims

1. A body frame for an automatic two-wheeled vehicle, said body frame comprising:

a head pipe; and

a pair of main frames having front ends, said front end of said main frame being fixed to said head pipe for forming a front wheel-steering mechanism, said pair of main frames extending downwardly at a given interval and in a linear manner toward a rear portion of said body frame, said pair of main frames each including at a lower portion a downwardly extending hanger, each of said main frames being a rectangular cross section having a vertical cross sectional length longer than a horizontal cross sectional length, said rectangular cross section forming a top wall, bottom wall and side walls, said main frame including at least one partition, said partition extending within said main frame in a longitudinal direction and being parallel to said bottom wall of said main frame, each of said main frames further including a groove at an outer surface of said side walls at a location corresponding to a junction of said partition and said side walls, said groove being located on said outside surface of said main frame to avoid abnormal deformation during bending to said main frame.

2. A body frame as defined in claim 1 wherein said pair of frames are each formed of an aluminum alloy.

3. A body frame as defined in claim 1, wherein said pair of main frames are each connected in a vicinity of said front end to a tubular member which is open at both ends through which a horizontal rod of a support stand is inserted.

4. A body frame as defined in claim 1, wherein said pair of main frames each pass on either side of an upper side portion of an engine and extend toward the rear portion of said body frame, and includes a tool-insertion passage at a position of each main frame corresponding to a position of an adjusting screw of a carburetor disposed on said engine, said passage extending in an axial direction of said adjusting screw.

5. A body frame as defined in claim 1, wherein reinforcing head pipe gussets are fixedly provided from lower portions of said pair of main frames to said head pipe.

6. A body frame as defined in claim 5, wherein said head pipe gussets are integrally coupled to engine hanger fittings provided on lower portions of said pair of main frames.

7. A body frame as defined in claim 5, wherein at least one of said head pipe gussets in provided with a passage for insertion of cables sich as control cables or wire harness, said passage extending through said body frame.

8. A body frame for an automatic two-wheeled vehicle, said body frame comprising:

a head pipe; and

a pair of main frames having front ends, said front end of said main frame being fixed to said head pipe for forming a front wheel-steering mechanism, said pair of main frames extending downwardly at a given interval and in a linear manner toward a rear portion of said body frame, said pair of main frames each including at a lower portion a downwardly extending hanger, each of said main frames being a rectangular cross section having a vertical cross sectional length longer than a horizontal cross sectional length, said rectangular cross section forming a top wall, bottom wall and side walls, wherein a portion of said top wall and one of said side walls of said rectangular cross section main frame forms an inclined face such that said main frame is pentagonal shaped at least in part thereof, said main frame including at least one partition, said partition extending within said main frame in a longitudinal direction and being parallel to said bottom wall of said main frame, each of said main frames further including a groove at an outer surface of said side walls at a location corresponding to a junction of said partition and said side walls, said groove being located on said outside surface of said main frame to avoid abnormal deformation during bending of said main frame.

9. A body frame as defined in claim 8 wherein said pair of main frames are each formed of an aluminum alloy.

10. A body frame as defined in claim 8, wherein said pair of main frames are each connected in a vicinity of said front end to a tubular member which is open at both ends through which a horizontal rod of a support stand is inserted.

11. A body frame as defined in claim 8, wherein said pair of main frames each pass on either side of an upper side portions of an engine and extend toward the rear portion of said body frame, and includes a tool-insertion passage at a position of each main frame corresponding to a position of an adjusting screw of a carburetor disposed on said engine, said passage extending in an axial direction of said adjusting screw.

12. A body frame as defined in claim 8, wherein reinforcing head pipe gussets are fixedly provided from lower portions of said pair of main frames to said head pipe.

13. A body frame as defined in claim 12, wherein said pipe gussets are integrally coupled to engine hanger fittings provided on lower portions of said pair of main frames.

14. A body frame as defined in claim 12, wherein at least one of said head pipe gussets is provided with a passage for insertion of cables such as control cables or wire harness, said passage extending through said body frame.

15. A body frame for an automatic two-wheeled vehicle, said body frame comprising:

a head pipe;

a pair of main frames having front ends, said front end of said main frame being fixed to said head pipe for forming a front wheel-steering mechanism, said pair of main frames extending downwardly at a given interval and in a linear manner toward a rear portion of said body frame, said pair of main frames each including at a lower portion a downwardly extending hanger, each of said main frames being a rectangular cross section having a vertical cross sectional length longer than a horizontal cross sectional length, said rectangular cross section forming a top wall, bottom wall and side walls;

a pair of pivot plates being connected to rear ends of said main frame to pivotally support a rear fork, said pivot plates extending longitudinally at the middle of the vehicle;

a pair of seat rail gussets being integrally formed at the top end of said pivot plates, and a pair of seat rails being fixed at the front ends thereof to an intermediate portion of the top wall of said main frame and extending rearwards over a rear wheel, said seat rails having portions slightly curved inward at the middle part thereof and being supportedly connected to said seat rail gussets at said curved portion.

16. A body frame as defined in claim 15, wherein reinforcing head pipe gussets are fixedly provided from lower portions of said pair of main frames to said head pipe.

17. A body frame as defined in claim 15, wherein said pipe gussets are integrally coupled to engine hanger fittings provided on lower portions of said pair of main frames.

18. A body frame for an automatic two-wheeled vehicle, said body frame comprising:

a head pipe;

a pair of main frames having front ends, said front end of said main frame being fixed to said head pipe for forming a front wheel-steering mechanism, said pair of main frames extending downwardly at a given interval and in a linear manner toward a rear portion of said body frame, said pair of main frames each including at a lower portion a downwardly extending hanger, each of said main frames being a rectangular cross section having a vertical cross sectional length longer than a horizontal cross sectional length, said rectangular cross section forming a top wall, bottom wall and side walls;

a pair of pivot plates being connected to rear ends of said main frame to pivotally support a rear fork, said pivot plates extending longitudinally at the middle of the vehicle;

a pair of seat rail gussets being integrally formed at the top end of said pivot plates, and a pair of seat rails being fixed at the front ends thereof to an intermediate portion of the top wall of said main frame and extending rearwards over a rear wheel, said seat rails having portions slightly curved inward at the middle part thereof and being supportedly connected to said seat rail gussets at said curved portion;

a fuel tank being supported on its front portion by said main frame and on its rear portion by said seat rails; and

a rear suspension being provided in the vicinity of said pivot plates and extending longitudinally therebetween, a lower end of the suspension being positioned below said rear fork and held to said pivot plates via a linkage.