JPS61202990A - Main frame of motorcycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a main frame of a motorcycle.

[Conventional technology]

As a conventional motorcycle that has a pair of main frames arranged symmetrically on the left and right sides of the vehicle body, the pair of main frames made of pipe material with an elongated rectangular cross section are gradually expanded symmetrically from the head pipe at the front of the vehicle body. extending rearward, and suspending the vertical V-type engine from the main frame in the F direction between the two main frames, and arranging the engine so that the two main frames bypass both sides of the upper part of the engine, respectively;
Some engines are equipped with a carburetor in the space formed between the front and rear cylinders of the vertical ifV engine.

[Problem that the invention seeks to solve]

In this way, when the main frame, which has a vertically long rectangular cross section, is arranged close to each other on both sides of the upper part of the engine,
Since the upper part is covered with a fuel tank, for example,
When adjusting the slow jet of a carburetor, you must either insert a special jig into the gap between the bottom of the main frame and the engine, or remove the carburetor that requires adjustment. Not necessarily,
There was an inconvenience that adjustment work, etc., took time and effort.

The present invention has been made in view of the above points, and is intended for use in motorcycles! The purpose of the present invention is to provide a main frame for a motorcycle that allows easy adjustment of a carburetor installed in the space between the cylinders of a stationary engine.

[Means for solving problems]

As a means for solving the above problems, the present invention includes a pair of main frames that extend symmetrically from the head vibrator at the front of the vehicle body and extend toward the rear of the vehicle body, bypassing the sides of the upper part of the engine. The motorcycle is characterized in that a tool insertion hole is provided in a side surface of the main frame at a position corresponding to an adjustment screw of a carburetor disposed above the engine, the tool insertion hole passing through the adjustment screw in a substantially extending direction of the axis of the adjustment screw. .

(Function) With this configuration, the carburetor can be adjusted by inserting a general-purpose tool such as a screwdriver through the through hole on the side of the main frame that surrounds the side of the carburetor, and operating the adjustment screw. This can be easily achieved by

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a motorcycle having a vertical V-type four-cylinder engine will be described below with reference to the drawings.

Figures 1 and 2 show a motorcycle according to an embodiment of the present invention with the seat, cowling, gauges, etc. removed, and the motorcycle 1 has a front wheel 2 rotatably supported between its lower ends. A front fork 4 having a handlebar 3 at its upper end is rotatably supported by a head vibe 5, and the head vibe 5 includes an aluminum extrusion having an R-shaped vertical rectangular cross section (see Fig. 2). The leading ends of a pair of closed hollow main frames 6 made of material are connected, and the connecting portion is reinforced by a head vibe gusset 7.

The pair of main frames 6 are tilted so that the rear side of the vehicle body is lower, and are gradually expanded symmetrically from the head vibrator 5 to extend toward the rear of the vehicle body in order to secure a housing space for the engine in the width direction. The separated rear end sides of both main frames 6 are connected in a ring shape by a cross pipe 8, and pivot plates 9 are respectively attached to the rear ends of both main frames 6, and the main frames 6 are supported between the two pivot plates 9. A rear fork 12, which rotatably supports a rear wheel 11, is supported so as to be swingable in the vertical direction.

Further, a seat rail 13 is provided on the upper surface of the main frame 6 so as to be tilted so that the rear side of the vehicle body is higher.
Sheet gusset plates 14 each extending above the
The rear fork 12 is also suspended by a rear suspension 15 so as to be able to absorb shock.

Further, the vertical V type 4 cylinder engine 16 is
6 is suspended from both main frames 6 via a pair of engine hangers 17 and a rear side of the vehicle via a pair of pivot plates 9, respectively, and the engine is a V-type device. The front cylinder part 16a provided with two front cylinders of 16 projects its upper part in the direction of the front wheel 2, and the rear cylinder part 16b provided with two rear cylinders projects its upper part upward from between the two main frames 6. ,
Seven fuel tanks 25 are fixedly installed on the upper surfaces of both main frames 6.

Further, in front of the engine 16, a radiator 18 has an upper part suspended from the head pipe gusset 7, and an intermediate part and a lower part connected to the engine 18 through link rods.
It is supported and provided at 6 (-).

Furthermore, two front cylinder exhaust pipes 19 are provided in the exhaust holes of each cylinder formed on the front side of the vehicle body of the front cylinder portion 16b of the engine 16, and an exhaust pipe 19 of each cylinder is formed on the rear side of the vehicle body of the rear cylinder portion 16b. Two rear cylinder exhaust pipes 20 are respectively connected to the holes, and both exhaust pipes 19
．． 20 is a primary merging pipe 21 at the rear of the engine 16.
．． After connecting to 21 and merging them, the secondary merging pipe 2
2 into one pipe, and is connected to an exhaust pipe 24 having a muffler 23 at its rear end.

On the other hand, in the space formed between the front cylinder part 16a and the rear cylinder part 16b of the engine 16 vertically installed in the shape of a square, there is air-fuel mixture in each combustion chamber of the front cylinder part 16a of the four-cylinder engine 16. A pair of carburetors to send 2
6 and a carburetor 27 that sends the air-fuel mixture to each combustion chamber of the rear cylinder portion 16b are respectively disposed, and a float is connected to the outer surface of each of the carburetors 26 and 27 on both sides of the vehicle body when the engine 16 is operated at low speed. Heads of adjusting screws 26a and 27a for adjusting the fuel supply speed of a slow jet (not shown) which sends fuel from a slow jet are respectively disposed, and the head position of the adjusting screw 27a of the carburetor 27 of the rear cylinder portion 16b is provided. corresponds to the inner surfaces of both main frames 6.

Tool insertion holes 28 are formed in the side surfaces of both the main frames 6 at positions corresponding to and covering the heads of the adjusting screws 27a in the axial extension direction of the adjusting screws 27a.

In this way, by forming the tool insertion hole 28 at a predetermined position on the side surface of each main frame 6 that surrounds the side of the carburetor 27, it is possible to perform not only carburetor adjustment but also slow jet adjustment work, which is performed relatively frequently. However, this can be easily done with a screwdriver, etc., while the carburetor is still assembled.

In this embodiment, a case has been described in which the main frame 6 is made of an aluminum extrusion molded material having an "eye"-shaped vertically elongated rectangular cross section with two internal partition walls. It can also be applied when using a member with a cross-sectional shape of "1 day" shape or a vertically elongated rectangle with no internal partition walls, or when using a member with a large vertical width such as a 7-sided oval. The present invention can also be applied to the main frame of a motorcycle equipped with an engine other than a vertical V-type four-cylinder engine.

FIG. 3 is a sectional view showing another embodiment of the main frame of a motorcycle according to the present invention, in which a tool insertion hole 31 is provided at a predetermined position in the side surface of the main frame 30, as in the previous embodiment. At the same time, a guide sleeve 32 is inserted into the tool insertion hole 31. By providing this guide sleeve 32, the tip of the inserted tool is guided to the inner circumferential surface of the guide sleeve 32 and automatically reach the head of the adjustment screw.

〔Effect of the invention〕

As explained above, the present invention provides a tool insertion hole that penetrates approximately in the direction of extension of the axis of the adjustment screw in the side surface of a pair of main frames at a position corresponding to the adjustment screw of the carburetor disposed at the top of the engine. Because of the built-in design, there is no need to remove the carburetor when adjusting the ignition brake, and the adjustment can be easily done using a general-purpose tool such as a screwdriver while the carburetor is still assembled, and it is not necessary in the past. There is no need for special jigs for adjustment work.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention,
FIG. 1 is a side view showing a motorcycle equipped with a main frame according to the present invention, FIG. 2 is a sectional view taken along the line ■-■ of FIG.
The figure is a sectional view showing a main frame according to another embodiment of the present invention. 1... Motorcycle 5... Head vibe 6.
・・Main frame 9・Pivot plate 1
2...Rear fork 13...Seat rail 1
6...Engine 16a...Front cylinder part 1
6b... Rear cylinder part 17... Engine hanger 25... Fuel tank 26, 27
... Carburetor 268.27a ... Slow jet adjustment screw 28 ... Tool insertion hole 30.
・・Main frame material 31 ・・Tool insertion hole 32
...Guide Sleeve Patent Applicant: Honda Motor Co., Ltd. Procedural Amendment June 6, 1986 Director General of the Patent Office Mr. Michibu Uga 2, Title of Invention: Motorcycle Main Frame 3, Person Making Amendment Case Relationship with Patent applicant (532) Honda Motor Co., Ltd. 4, substitute! Person 5 corrects Figure 2 of the voluntarily submitted drawings on the date of the amendment order as shown in the attached sheet. that's all

Claims (1)

[Claims] 1. In a motorcycle equipped with a pair of main frames that expand symmetrically from a head pipe at the front of the vehicle body and extend toward the rear of the vehicle body bypassing the sides of the upper part of the engine, the upper part of the engine on the side surface of the main frame. 1. A main frame for a motorcycle, characterized in that a tool insertion hole is provided at a position corresponding to an adjustment screw of a carburetor disposed in the main frame, the tool insertion hole passing through the adjustment screw in a substantially extending direction of the axis of the adjustment screw.