JPH11342886A - Power unit suspension device for motor scooter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a power unit suspension device strong to a twist, to improve maneuvering stability, and reduce weight by fastening/installing stopper rubber to/on a boss piece of a plate projected in both end parts of a cylindrical bracket, and cutting out mutual left/right bearings of the cylindrical bracket as a semicylindrical part. SOLUTION: A cylindrical bracket 4 is a laterally long cylindrical shape, a bearing 5 and a bush 6 are respectively installed in both end parts, and mutual left/right bearings 5, 5 are cut out in half so as to become the semicylindrical part 7. A support shaft 8 is laternally inserted to be pivoted to a frame 9. The reason for forming the semicylindrical part 7 is to reduce weight as well as to insert the bolt-shaped support shaft 8. A boss piece of a plate is protrusively arranged in both end parts of the cylindrical bracket 4, and a central hole of stopper rubber is fastened/installed by a bolt. An outer cylinder of the stopper rubber is fixed to the frame 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power unit suspension system for a scooter.

[0002]

2. Description of the Related Art A scooter is formed by extending one side of an engine case to a rear side, accommodating a clutch and a speed reducer, and mounting a rear axle for rotating and driving a rear wheel, to form a single unit from the engine to the rear wheel. Power unit type. In the power unit, a front upper portion is pivotally mounted on a frame by a suspension bracket, and a rear portion is connected to a cushion cylinder so that the power unit can swing and the rear wheel can be cushioned up and down. There are a pair of left and right brackets and a left and right integrated type for suspending the power unit on the frame.

As shown in FIGS. 9 to 11, the right and left cylindrical brackets A and B are mounted on a frame E with a support shaft D via a bearing B and a bush C, as shown in FIGS. A bearing H is mounted on the cylindrical body G at the tip of the arm F, a boss J at the upper front of the power unit is inserted between the left and right cylindrical bodies G, and the power unit is pivotally mounted through a pivot shaft K. . Also, the center of the cylindrical stopper rubber N is fastened to the boss piece M of the plate L protruding from one side of the left and right cylindrical brackets A. The outer periphery of the stopper rubber N is fixed to the frame E side.

[0004] The power unit can swing about a swing axis K to cushion the rear wheel up and down. In the power unit, the engine swings, and the rear wheels also start and brake, causing a shock mainly in the front-rear direction. This swing or shock is absorbed by the left and right cylindrical brackets A slightly swinging about the support shaft D within the range in which the stopper rubber N can bend, and the vibration and shock are transferred to the frame E side. Reduce transmission.

As shown in FIGS. 12 and 13, the left and right integrated type is such that the cylindrical bracket A is elongated, and the pair of left and right type left and right cylindrical brackets A is formed into one long cylindrical bracket A. The support shaft D is also long, and a central spacer Q is inserted in the center in order to maintain the position of the inner P of the left and right bearings B. In addition, the bush C, the frame E, the arm F, the cylindrical body G, the bearing H, the boss portion J of the power unit, the swing shaft K, the plate L, the boss piece M, etc. are the same as those of the left and right pair type, and have the same reference numerals. And the description is omitted. Then, the power unit swings around the swing axis K to cushion the rear wheel, and the cylindrical bracket A can slightly swing to absorb the swing and shock.

[0006]

When a vehicle is traveling on a curve or the like, the scooter may be subjected to a lateral force due to centrifugal force, and may exert a force that twists the power unit horizontally. The left-right paired type is vulnerable to torsion and lowers steering stability because the cylindrical bracket is divided into right and left and can move left and right when it is twisted. On the other hand, the left and right integrated type is hard to twist and has good steering stability.
However, the right-and-left integrated type has a disadvantage that the cylindrical bracket A is longer, the support shaft D is longer, the central spacer Q is required, and the weight is heavier than the left-right integrated type.

The present invention has been made in view of the above-mentioned problems of the prior art, and it is strong against twisting, has good steering stability, and can be lighter in weight and has better performance as compared with the left and right integrated type. It is an object to obtain a power unit suspension for a scooter.

[0008]

In order to achieve the above object, a power unit suspension device for a scooter according to the present invention comprises an arm cylinder projecting from both ends of a cylindrical bracket which is mounted on a frame with left and right support shafts. Insert the boss of the power unit between the bodies, swing the power unit through the swing shaft, and fasten the stopper rubber to the boss pieces of the plate protruding from both ends of the cylindrical bracket, The semi-cylindrical part is cut off between the left and right bearings. Then, the cutout portion of the semi-cylindrical portion of the cylindrical bracket may be limited to only the portions near the left and right bearings.

Also, the power unit boss portion of the cylindrical body of the arm protruding from the left and right cylindrical brackets that are pivotally mounted on the frame is sandwiched therebetween, and the power unit is pivotally pivoted through the pivot shaft, and the right and left pivots are pivoted. A stopper rubber is fastened to a boss piece of a plate protruding from the cylindrical bracket, and the left and right cylindrical brackets are connected by connecting pieces.

[0010] The cylindrical bracket is provided with a portion through which a support shaft passes on both sides, and a center portion or an inner portion of left and right bearings is cut into a semi-cylindrical portion so that a support shaft or a nut of the support shaft can pass therethrough. The parts supported by the left and right spindles swing slightly together. In addition, since the left and right cylindrical brackets are integrally connected by the connecting pieces, they are resistant to torsion and can improve steering stability. Since the support shaft is divided into right and left portions and is short, and a central spacer is unnecessary, the weight can be reduced.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 4 and FIG.
1 shows an embodiment of the present invention. The power unit 1 has the engine 2 to the rear wheel 3 integrally formed.

The cylindrical bracket 4 has a long tubular shape on the left and right.
A bearing 5 and a bush 6 are provided at both ends, and a half of the bearing 5 and the bush 6 is cut off so as to form a semi-cylindrical portion 7 between the left and right bearings 5. Then, the support shaft 8 is passed right and left, and the shaft 9 is attached to the frame 9. The semi-cylindrical part 7 is
The weight is reduced and the bolt-shaped support shaft 8 can be passed through. When the bolt-shaped support shaft is passed from the outside and a nut is screwed inside, the notch of the semi-cylindrical portion 7 is cut out. The semi-cylindrical portion 7 can be assembled even if the length is short.
As shown by a two-dot chain line 10, the portion to be formed into the semi-cylindrical portion 7 may be a portion close to the bearing 5.

A cylindrical body 12 is fixed to both ends of the cylindrical bracket 4 at the tip of a protruding arm 11. Left and right cylinders 1
The bearing 2 is provided with a bearing 13 therein. The boss 14 of the power unit 1 is sandwiched between the left and right cylinders 12. At both ends of the cylindrical bracket 4, boss pieces 17 are provided to project from the plate 16, and a central hole of the stopper rubber 18 is fastened with a bolt 19. The outer cylinder 20 of the stopper rubber 18 is fixed to the frame 9.

FIGS. 5 and 6 show another embodiment of the present invention. In this case, the cylindrical bracket 4 is a pair of left and right types, and the cylindrical body 12 and the boss piece 17 are provided on the left and right cylindrical brackets 4 so as to protrude. And
Instead of the cut-out portion of the semi-cylindrical portion 7 of the cylindrical bracket 4 shown in FIGS. 1 to 4 and 7, the left and right cylindrical brackets 4 are integrally connected by connecting pieces 21 by bolting or welding. I do. Others are shown in FIGS. 1 to 4 and FIG.
The same components are denoted by the same reference numerals in the drawings.

The power unit 1 swings about a swing shaft 15 to cushion the rear wheel 3 up and down. The rocking of the engine and the shock of the rear wheel 3
The cylindrical bracket 4 is supported by the support shaft 8 within a range where the
, And absorbs vibrations and shocks, thereby reducing vibrations and shocks transmitted to the frame 9. The cylindrical bracket 4 is formed integrally with the semi-cylindrical portion 7 or is integrally formed by connecting the pair of left and right cylindrical brackets 4 with the connecting pieces 21, so that the cylindrical bracket 4 is hardly twisted and steering stability is improved. . Then, the support shaft 8 can be divided into right and left parts and shortened, the central spacer can be omitted, and the weight can be reduced.

[0016]

As described above, since the present invention is constructed as described above, the notch in the semi-cylindrical portion of the cylindrical bracket or the left and right cylindrical brackets are integrally connected by the connecting piece, so that It can be made to oscillate by movement, and it can be made tough against twisting, and steering stability is improved. In addition, the support shafts to be attached to the frame can be shortened separately on the left and right sides, and the center spacer is not required, and the performance can be improved by reducing the weight. The notch in the semi-cylindrical portion of the cylindrical bracket is effective for passing the support shaft or a nut for stopping the support shaft.

[Brief description of the drawings]

FIG. 1 is a partially longitudinal plan view showing an embodiment of the present invention.

FIG. 2 is a partial vertical sectional view of a stopper rubber portion showing one embodiment of the present invention.

FIG. 3 is a sectional view taken along line XX of FIG. 1;

FIG. 4 is a perspective view showing an embodiment of the present invention.

FIG. 5 is a perspective view showing another embodiment of the present invention.

FIG. 6 is a partially longitudinal plan view showing another embodiment of the present invention.

FIG. 7 is a side view showing an embodiment of the present invention.

FIG. 8 is an overall side view of the appearance of a power unit type scooter.

FIG. 9 is a partially longitudinal plan view of a conventional pair of left and right brackets.

FIG. 10 is a side view of FIG. 9;

FIG. 11 is a perspective view of a conventional left-right paired bracket.

FIG. 12 is a perspective view of a conventional left and right integrated bracket.

FIG. 13 is a partially longitudinal plan view of a conventional left and right integrated bracket.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power unit 4 Cylindrical bracket 5 Bearing 7 Semi-cylindrical part 8 Support shaft 9 Frame 11 Arm 12 Cylindrical body 14 Boss part 15 Oscillating shaft 16 Plate 17 Boss piece 18 Stopper rubber 21 Connecting piece.

Claims (3)

[Claims] 1. A boss portion of a power unit is inserted between cylinders of arms protruding from both ends of a cylindrical bracket which is pivotally mounted on a frame on both left and right sides, and the power unit is swingable through a swing shaft. A scooter characterized in that a stopper rubber is fastened to a boss piece of a plate protruding from both ends of a cylindrical bracket by being attached to a shaft, so that a semicylindrical portion is cut out between left and right bearings of the cylindrical bracket. Power unit suspension. 2. The power unit suspension system for a scooter according to claim 1, wherein the notch in the semi-cylindrical portion of the cylindrical bracket is formed only in a portion near the left and right bearings. 3. A boss of the power unit is inserted between the cylinders of the arms protruding from the left and right cylindrical brackets which are pivotally mounted on the frame with the support shaft, and the power unit is pivotally pivoted through the pivot shaft. A power unit suspension device for a scooter, wherein stopper rubber is fastened to a boss piece of a plate protruding from left and right cylindrical brackets, and the left and right cylindrical brackets are connected by connecting pieces.