BODY COVERS FOR MOTORCYCLE

Abstract: The motorcycle frame cover (17) comprises a front cover (20). There are detachable left hand and right hand side covers (21) fastened to its rearward edges. These side covers (21) extend rearwards passing below the seat, covering openings in the front cover opposite the engine (9). They curve gently inward toward the frame centre line to give space for the rider's knees.

Description: Technical Field This invention relates to a body cover for covering all over the front and both right and left sides of the body of a motorcycle. Background Art Some motorcycles are of the type in that a front part of a car body is covered with a front cowling from the front to both right and left sides so as to minimize air disturbance caused by car running, thereby to reduce running resistance. The front cowling is provided on the front with a cooling air inlet port so that an engine mounted inside the front cowling is cooled by running air flowing frown the inlet port. Japanese Patent Early Laid-open Publication No. 60-146771 discloses a body cover for such motorcycles, wherein both right and left frame covers 01 with front parts thereof bent outwards generally in a U-shape, as shown in Fig. 1, is mounted on an under side of a seat 02 and with outsides of front ends thereof held in alingment with a rear edge 04 of a front cowling 03, thereby to prevent a leg portion of a rider from hot air which has just finished its task for cooling an engine 06. In such motorcycles as described, however, the rear edge 04 of the front cowling 03 is situated at a part where the leg of the rider who sits astride the seat 02, is abutted and thus undesirable. Moreover, cooling air flowing backwards passing through the engine 06, receives resistance from the portion 05 of the front end of the frame cover 01 which is bent generally in a U-shape. Furthermore, running air flowing a long the outside of the front cowling 03, is disturbed at a portion where the outside of the front cowling 03 is discontinued at the rear adge 04, thereby to increase air resistance. In addition, in such motorcycles as mentioned, the whole front cowling 03 must be removed from the body when a maintenance is performed on the engine. Disclosure of Invention Under the circumstances as mentioned, a body cover for a motorcycle of the present invention comprises a body an engine, a seat and a cover for covering the body and the engine, the cover comprising : a front cover covering a front part of the body from the front to both sides thereof having an air inlet port ; and right and left side covers joined to the front cover and extending to rear under the seat ; characterised in that the front cover comprises openings facing the engine in both sides ; and in that the side covers comprise : front side parts covering the openings and dividably attached to sides of the front cover ; rear side parts, the cover width between the rear side parts being smaller than that between the front side parts ; and middle side parts gently bent towards the center line of the body from the front side parts at the rear end of the engine to the rear side parts. Hence, cooling air flowing inside the body cover as well as running air flowing outside thereof are smoothly moved backwards along the gently bent surfaces. Air resistance is not increased and the bent surfaces allow for a confortable riding. Various parts including the engine covered with the body cover may be exposed sidewards simply by removing the side covers from the front cover. Thus, daily inspection, maintenance and repairing work are very easy to perform. Brief Description of Drawings Fig.1 is a cross sectional view of a conventional body cover for motorcycles. Fig.2 is a side view of a motorcycle equipped with a body cover according to the present invention. Fig.3 is a side view of the motorcycle with side covers removed therefrom. Fig.4 is a perspective view of side covers. Fig.5 is a generally sectional view taken along line V-V of Fig.2. Best Mode for Carrying Out the Invention Figs.2 through 5 show one embodiment of the present invention. A body of the illustrated motorcycle, as apparent from Fig.3, includes a main frame 4 extending backwards from a head pipe 3 pivotably supporting a front wheel 1 through a front fork 2. The main frame 4 is provided with a rear wheel 6 swingably mounted on a rear lower part thereof through a rear fork 5. An upper half part of the rear wheel 6 is covered with a fender 6a mounted on the rear fork 5. A back-stay 7 extends backwards from a rear part of the main frame 4. A rear end of the back-stay 7 and an intermediate part of the main frame 4 are connected together by a seat rail 8. In this way, a body frame comprising main frame 4, back-stay 7, and seat rail 8, is provided with auxiliary equipment such as an engine 9, a radiator 10, a radiator reserve tank 11, a battery 12, a carburetor 13, and an air cleaner 14. A seat 15 is placed on and secured to the seat rail 8. A fuel tank 16 is mounted on a front part of the seat 15 in such a fashion as to cover the head of the engine 9, the carburetor 13, and the air cleaner 14. The fuel tank 16 is pivotably attached at an rear end thereof to the body frame as such that it can be vertically opened and closed. The body, as shown in Figs. 2 and 5, is widely covered at its front part with a body cover 17 from the front to both sides thereof. A rider sits astride the seat 15 with his feet placed on steps 18 projecting sidewards from the body and with his knees placed along the outer surfaces of the rear both sides of the body cover 17 and operates a handle 19. The body cover 17 is divided into a front cover 20 and a pair of right and left side covers 21, 21. The front cover 20, as shown in Fig. 3, covers at its upper part a front part of the handle 19 from the front to both sides thereof, and at its lower part a front part of the engine 9. The lowermost part of the front cover 20 extends backwards close to the rear wheel 6 along both sides of the car body. That is, both sides of the front cover 20 are each provided at a part facing the engine 9 installed at a vertically intermediate position, with an opening 22 which is widely and deeply scooped out from a rear edge to the front thereof. In this embodiment, the front cover 20 is divided into two vertical parts along a separating line S. Alternatively, the front cover 20 may be integrally formed. The front cover 20 is provided at a part thereof positioned in front of the engine 9 with an air inlet port, so that heating portions such as radiator 10 and engine 9 are cooled by running air which flows into the inlet port from the front during the motorcycle is running. The opening 22 of the front cover 20 is covered with the side covers 21. The side covers 21 is secured to the front cover 20 by a bolt 23 (Fig. 5) at its front part 21a along the edge of the opening 22. The front part 21a forms a same plane as the front cover 20 and makes up for the side cut out by the opening 22. The right and left side covers 21, 21, as shown in Fig. 4, are symmetric with each other with respect to the central vertical plane of the car body. A width between the side covers 21, 21 is formed wide at the front part 21a. Each side cover 21 becomes, at a rear part of the front part 21a, an inclined surface 21b gently bent towards the center line of the car body and extends backwards at the rear part 21c succeeding the inclined surface 21b. The rear part 21c extends backwards under the seat along the side of the car body. A width between the right and left rear parts 21c becomes narrow compared with that between the front parts 21a. Accordingly, a rider can comfortably sit on the seat 15 with his knees placed along the rear parts 21c in the manner as described. Furthermore, a part from the rear part 21c to the front inclined surface 21b is a smooth outer surface comprising a sheet of the side cover 21. Since no unnatural projections such as bolt, rear edge of the front cover 20, etc. are present at that part, a comfortable riding can be obtained. A rear end of the rear part 21c is formed with a swelling part 21d covering the front part of the rear wheel 6 from both sides. The feet of the rider placed on the steps 18, as shown by the dotted line in Fig. 5, are situated in spaces between the inclined surface 21b and the swelling part 21d. The front part 21a is provided with an air outlet port 24 far releasing a part of air passed through the radiator 10. In this way, the sides of the body cover 17 comprising the front part 20 and the side covers 21, form a smooth outer surface which is continuously shifted into the front part 21a of the side covers 21 from the front cover 20 and smoothly continued to the rear part 21c via the smooth inclined surface 21b. Accordingly, a running air a flowing outside the body cover 17 flows to the rear from the front along such smooth outer surface without being disturbed. As a result, the running resistance is reduced. The inner surface of the body cover 17 also becomes a smooth surface continuously extending from the front part having a wide width to the rear part having a comparatively narrow width via the inclined surface 21b. Accordingly, a running air b flowing from the front air inlet port cools the engine 9, etc. and thereafter, flows backwards without any resistance being guided by the smooth inner surface. Therefore, a sufficient amount of cooling air can be taken into the body cover 17 through the air inlet port. After passing through the radiator 10, a part of the running air b is discharged outside through the air outlet port 24, and the remaining air passes the rear part 21c. Accordingly, notwithstanding of the fact that the width of the rear part is narrow, the flow resistance is small. Furthermore, the side covers 21 can be very easily removed from the front cover 20 by removing the bolt 23. When the side covers 21 are removed, various equipment such as engine 9, radiator 10, radiator reserve tank 11, battery 12, carburetor 13, and air cleaner 14 which are covered with the body cover 17, expose sidewards. Therefore, these equipment can be very easily inspected, maintained, repaired and so on. As described in the foregoing, a body cover for a motorcycle of the present invention comprises a front cover for covering a front part of a car body from the front to both sides thereof and having openings on both sides thereof facing an engine, and right and left covers dividably attached to the sides of said front cover and covering said openings, said right and left covers being bent gently toward the center line of the car body from the front toward the rear and then extending to the rear under a seat along the car body. Accordingly, since the parts where the rider's legs abut become smooth surfaces, a comfortable riding is obtainable. Moreover, since cooling air flows smoothly along the outer surface of the body cover, the running resistance can be reduced. Similarly, cooling air flowing inside the body cover flows backwards smoothly along the inner surface of the cover to effectively cool heating parts such as engine. Furthermore, various parts including the engine covered with the body cover are exposed sidewards simply by removing the side covers from the front cover. Thus, the inspection, maintenance and repairing work are very easy to perform.

Claims: Motorcycle comprising a body (4), an engine (9), a seat (15) and a cover (17) for covering the body and the engine, the cover comprising : a front cover (20) covering a front part of the body from the front to both sides thereof having an air inlet port ; and right and left side covers (21) joined to the front cover and extensing to rear under the seat ; characterised in that the front cover comprises openings facing the engine in both sides ; and in that the side covers comprise : front side parts (21a) covering the openings and dividably attached to sides of the front cover ; rear side parts (21c), the cover width between the rear side parts being smaller than that between the front side parts ; and middle side parts (21b) gently bent towards the center line of the body from the front side parts at the rear end of the engine to the rear side parts. A body cover as claimed in claim 1, wherein a front edge of the opening of said front cover is connected with a front edge of said side covers as such that the outer surfaces of said front cover and side covers form a continuous surface. A body cover as claimed in claim 1, wherein said side covers are each formed in a front portion thereof with an air outlet port (24) for introducing air from inside of said side covers to outside.

Inventors: KOHAMA, MITSUYOSHI K.K HONDA GIJUTSU KENKYUSHO NAI, OGISHIMA, TETSUO K.K HONDA GIJUTSU KENKYUSHO NAI
Applicants: HONDA GIKEN KOGYO KABUSHIKI KAISHA
Application year: 1987
Main classification: B62J17
IPC codes: B62J23, B62J17