JPH0231990A - Frame of motorcycle - Google Patents

Abstract

PURPOSE:To mount a front cylinder firmly by intersecting at a right angle bridge pipes for connecting the front of a tank rail to the upper part of a down tube with the axis of the front cylinder arranged in V-type and by suspending a cylinder head between suspending plates of the bridge pipes. CONSTITUTION:The front part of a pair of right and left tank rails 3 forming a double cradle type frame is connected to the upper part of a down tube 4 by means of a pair of right and left bridge pipes 19a and 19b in such a manner that the bridge pipes intersect with the axis of a front cylinder 20 of a V-type engine 6. A pair of right and left suspending plates 23a and 23b are mounted to the bridge pipes 19a and 19b and the cylinder head 21 of the front cylinder 20 is suspended with a through bolt 26 between the suspending plates 23a and 23b. Thus, the front cylinder of the V-type engine can be mounted rigidly and firmly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a frame for a motorcycle equipped with a V-type engine.

(Prior art) In motorcycles, the engine mounted in the center of the vehicle body is usually suspended with the crankcase or millon case attached to the frame and the cylinder part floating. In this case, since the mass of the floating part is large, the cylinder part is often also connected to the frame, as seen in Japanese Patent Laid-Open No. 62-59184. As a result, the @rib of the engine is suppressed, and at the same time,
The engine unit is used as part of the frame, increasing the rigidity of the frame.

Depending on the shape of the frame, if it is difficult to connect the cylinder portion directly to the frame as in the above-mentioned publication, the cylinder portion may be suspended via a suspension plate. However, the suspension plate has become larger and shaped due to the relative relationship between the cylinder part and the frame.
Therefore, the deformation under load becomes large and complicated, which may affect the rigidity of the frame. For this reason, there is a tendency to increase the thickness of the plate, which leads to an increase in quantity, and if the shape is rough, the processing cost increases, resulting in an overall increase in cost.

(Problem to be solved by the invention) As described above, in a motorcycle equipped with a V-type engine,
When the engine cylinder part is suspended from the frame using a suspension plate, there are problems in that the suspension plate becomes larger and has a more complicated shape, which tends to increase weight and cost.
This invention reduces and simplifies the shape of the suspension plate,
It is an object of the present invention to provide a frame for a two-wheeled motor vehicle that can solve the above problems.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, a frame in a motorcycle of the present invention has a rear end portion of a pair of left and right tank rails extending rearward from a head pipe, and a lower The front part of the tank rail and the upper part of the down tube are connected to the front part of the tank rail and the upper part of the down tube in a motorcycle equipped with a ■ type engine in a double cradle type frame that connects the rear ends of a pair of left and right down tubes that hang down and are guided rearward by a center pillar. A pair of left and right bridge pipes to be connected are arranged so as to be almost perpendicular to the front cylinder axis of the V-type engine, and the cylinder head of the front cylinder is passed through the bolts between the pair of left and right suspension plates 1- attached to this bridge vibe. The structure is such that it can be suspended.

(Function) In this way, since the bridge vibrator is made to be substantially perpendicular to the axis of the front cylinder, the suspension plate, which is substantially parallel to the upper surface of the cylinder head and interposed between them, has a long and simple shape.

Therefore, the suspension plate can be easily formed by pressing or other forming processes, and since it is miniaturized, the rigidity is increased, and the plate thickness does not need to be increased. It also increases the rigidity of the frame.

By making the axis of the rear cylinder almost perpendicular to the tank rail, it is also suspended via a long and thin rectangular suspension plate, which works in the same way as front cylinder suspension, doubling the weight and cost reduction effect. do.

(Example) DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings showing embodiments of the present invention will be explained below.

Figure 1 is a side view of a two-wheeled motor vehicle constructed with the frame of the present invention, in which the main frame 1 is of a double cradle type, and the rear part of a pair of left and right tank rails 3 extending rearward from a head vibe 2, and the rear part of a pair of left and right tank rails 3 extending rearward from a head vibe 2, are shown. It is formed by connecting the rear ends of a pair of left and right down dupes 4 that are guided rearward with a center pillar 5, and a ■-type engine 6 is mounted therein.

A face width 7 is supported on the head vibrator 2 so as to be steerable, and a rear wheel 9 is supported on the rear end of a swing arm 8 which is pivotally supported by a center pillar 5. Fuel tank 1 is on tank rail 3
0 is placed thereon, and the seat 12 is placed R on the seat rail 11 connected to the rear.

The engine 6 mounted in the main frame 1 is suspended by bolts 15 on a suspension plate 14 to which the front edge of a crankcase 13 is welded to the down tube 4, and the rear upper end of the mission case 16 is extended to the center pillar 5. It is suspended on a suspension plate 17 with bolts 18.

Next, a pair of left and right bridge vibes 19a and 19b connecting the front part of the tank rail 3 and the upper part of the down tube 4 are provided. These bridge vibes 19a, 19b are connected to the V
It is set to be substantially perpendicular to the axis of the front cylinder 20 of the type engine 6 and to pass above the cylinder head 21.

A pair of attachment pipes 22a and 22b are welded to each of the bridge vibes 19a and 19b, passing through the pipes horizontally at the front and rear, and a suspension plate 23a is attached to the inner end of each of the attachment pipes 22a and 22b.
, the front and rear ends of 23b are connected to bolts 24a, 24b and oak t-2
5a and 25b are tightened and fixed.

The lower edges of the suspension plates 23a and 23b sandwich the cylinder head 21, and the through bolts 2 are stacked in three rows at the rear end of the bamboo.
6 is penetrated and by tightening the knot 27, the front cylinder 20 is suspended on the main frame 1. Since the front cylinder 20 is offset to one side from the longitudinal centerline of the main frame 1, one of the attachment pipes 22b is set long.

With this configuration, the suspension plate 23a,
23b has an elongated and simple shape, so that the load deformation of the front and rear attachment parts is equalized, and since the distance from the fixed upper edge to the free lower edge is short, the load deformation is small and the rigidity is high. The rigidity of the frame 1 is increased through the engine 6, the load distribution is equalized, and the stability is increased. In addition, the suspension plates 23a and 23b can be easily processed by press molding, etc., and there is no need to increase the plate thickness due to the small size. , the cost burden is reduced.

On the other hand, the tank rail 3 is set to be substantially perpendicular to the axis of the rear cylinder 28 and to pass directly above the cylinder head 29. A pair of left and right suspension plates 30 are suspended and fixed to the tank rail 3, and the cylinder head 29 is sandwiched between the lower edges thereof and suspended by through bolts 31.

Like the suspension plates 23a and 23b, the suspension plate 30 can be set to a small size with an elongated, medium-sized shape, which enhances its function as a suspension plate, and reduces vehicle size and cost.

(Effect of the invention) As mentioned above, the motorcycle frame according to the present invention has the following features:
A ■-type engine is mounted on a double cradle-type frame, and a pair of left and right bridge pipes that connect the top of the down tube and the front of the tank rail are arranged almost perpendicular to the axis of the ■-type engine's front cylinder. The cylinder head of the front cylinder is sandwiched between a pair of left and right suspension plates attached to this bridge pipe, and suspended using through bolts.The suspension plates can be set to a simple shape with a small and long rope, and the rigidity is increased. This has the effect of stabilizing the suspension, reducing flooding, and reducing costs including processing costs.

[Brief explanation of the drawing]

Fig. 1 is a side view of a motorcycle constructed with a frame according to an embodiment of the present invention, Fig. 2 is an enlarged side view of the main parts of the frame shown in Fig. 1, and Fig. 3 is Fig. 2A- FIG. 3 is an enlarged vertical cross-sectional view taken in the direction of arrow A. 1...Main frame, 2...Cylinder head, 3...
・Tank rail, 4... Down tube, 5... Center pillar, 6... V type engine, 19a, 19b
...Bridge pipe, 20...Front cylinder,
27... Cylinder head, 23a, 23b... Suspension plate, 26... Through bolt, 28... A cylinder, 29... Cylinder head, 30... Suspension plate, 31... Through bolt. Figure 3

Claims (1)

[Claims] 1. A double cradle in which the rear ends of a pair of left and right tank rails extending rearward from a head pipe and the rear ends of a pair of left and right down tubes that hang downward and are guided rearward are connected by a center pillar. In a motorcycle equipped with a V-type engine in a type frame, a pair of left and right bridge pipes connecting the front part of the tank rail and the upper part of the down tube are arranged so as to be almost perpendicular to the front cylinder axis of the V-type engine. A frame for a two-wheeled motor vehicle, characterized in that the cylinder head of a front cylinder is passed between a pair of left and right suspension plates attached to the bridge pipe and suspended by bolts. 2. The tank rail and the axis of the rear cylinder of the V-type engine are set to be almost perpendicular to each other, and the cylinder head of the rear cylinder is passed through and suspended between a pair of left and right suspension plates attached to this tank rail with bolts. A frame for a two-wheeled motor vehicle according to claim 1.