JPS62128891A - Frame for 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] (Industrial application field) This invention relates to motorcycle frames.

(Prior art and its problems) Motorcycles are equipped with an engine and run by driving the rear wheels through an engine chain.Then, a front fork that suspends the front wheel and a swing arm that suspends the rear wheel are used. for,
Each vehicle is provided with a cushion so that the front and rear wheels can be cushioned. Once the size of the engine and the size of the front and rear wheels are determined, the front end of the swing arm is pivoted to the rear of the engine, so the size of the frame is determined, and the wheelbase is also approximately determined. It's small, and there are limits to how much it can be made into a compact light 4.

[Purpose of the invention]

This invention enables the rear part of the engine case and the pivot part of the front end of the swing arm to be arranged side by side, so that the frame is small and has a short wheelbase, making it possible to create a small and light motorcycle frame with good vehicle performance. The purpose is to obtain.

(Structure of the Invention) The present invention will be described below with reference to examples of solid/I colors shown in the drawings.

Brackets 1 to 3 on both sides of the left 6 consisting of an outer plate 1 and an inner plate 2 are provided. Insert the rear part of the engine case 4 between the left and right inner plates 2, insert the front end of the swing arm 5 between the left and right outer plates 1 and the inner plate 2, and attach it pivotably, using a through bolt, The inner plate 2 and the outer plate 1 are fastened together.Then, the brackets 3 on both sides, consisting of the outer plate 1 and the inner plate 2, are each tightened using bolts to the rear ends of the left and right main tubes 6 of the frame. .

There is a gap between the inner plate 2 and outer plate 1 of one bracket 3, through which a chain 8 for driving the rear wheel 7 passes. A rear wheel 7 is suspended from the rear end of the swing arm 5, and a cushion unit 10 is connected to the east of the swing arm 5 via a link 9, so that the swing arm 5 swings to provide a cushion. Steps 11 on which the rider places his/her feet are attached to the outer panels 1 of the brackets 3 on both sides, as well as stands 12, placket pedals, etc.

[Action of the invention]

The brackets 3 on both sides are made of an outer plate 1 and an inner plate 2, and the rear part of the engine case 4 is sandwiched between the inner plates 2 on both sides and tightened. Both curved ends of the swing arm 5 are rotatably pivoted with a gap provided therebetween. Therefore, the rear part of the engine case 4 and the front end of the swing arm 5 can be extended 1 m rearward, the swing arm 5 can be positioned on the front side, the wheelbase can be shortened, and the whole can be made smaller and lighter. chain 8
Since the bracket 3 is designed to pass through the gap between the outer plate 1 and the inner plate 2 of the bracket 3 on one side, the width does not become too large.

〔Effect of the invention〕

As explained above, the present invention provides brackets on both the left and right sides in which outer plates and inner plates are arranged with a gap, connects the rear part of the engine case between the inner plates of the brackets on both sides, and connects the outer plates of the brackets on both sides. Attach both sides of the front end of the swing arm between the inner plates, pass the chain that drives the rear wheel between the outer plate and inner plate of one bracket, and tighten the tops of the brackets on both sides to the rear ends of the left and right main tubes of the frame. This allows the rear part of the engine case and the front end of the swing arm to be arranged so that they overlap in the front-rear direction, making it possible to shorten the wheelbase and make the overall vehicle lighter and smaller, with better performance. And since the chain passes between the inner and outer panels on one side, the width does not become too large. In addition, in the case of assembly, it is sufficient to assemble the engine case and swing arm to the left and right brackets 1- in advance and connect these to the main tube, making it possible to perform partial assembly and making the work easier.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, in which Fig. 1 is an overall side view, Fig. 2 is an enlarged side view of the main part, Fig. 3 is an enlarged rear view of the main part,
FIG. 4 is a perspective view of the frame with the bracket removed. 1...Outer plate, 2...Inner plate, 3...Bracket [・
, 4...Engine coupe, 5...Swing arm, 6...Main duplex, 7...Rear wheel, 8...Chin.

Claims (1)

[Claims] Brackets are provided on both the left and right sides with outer and inner plates arranged with a gap, the rear of the engine case is connected between the inner plates of both brackets, and both front ends of the swing arm are pivoted between the outer and inner plates of both brackets. The motorcycle is characterized in that a chain for driving the rear wheel is passed between the outer plate and inner plate of the bracket on one side, and the upper parts of the brackets on both sides are fastened to the rear ends of the left and right main tubes of the frame. flame.