JP2003237667A - Power unit supporting device for scooter type motor cycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify a supporting structure of a link, and to reduce cost, while keeping high stiffness in a twisting direction of a connection part between a vehicular body frame and a power unit coupling link. <P>SOLUTION: A middle supporting portion is formed between a rocking base portion and a rocking end portion of the power unit coupling link 5. A part of the vehicular body frame 4 is extended to a side part of the middle supporting portion. The rocking base portion and the middle supporting portion are elastically supported by an extending portion 26b. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power unit supporting device for a scooter type motorcycle for supporting a unit swing type power unit on a vehicle body frame by a link so that the power unit can swing.

[0002]

2. Description of the Related Art A conventional power unit supporting device of this type is disclosed in, for example, Japanese Patent Laid-Open No. 11-198890. The power unit support device disclosed in this publication includes a tubular bracket arranged between one side of the vehicle body frame on the left side of the vehicle body and the other side of the vehicle body on the right side of the vehicle body. The power unit is swingably supported by the vehicle body frame by a link having a pair of arms projecting downward and rearward.

In the power unit, an engine and a transmission case are integrally formed, and a rear wheel is provided at a rear end portion of the transmission case, and the engine is connected to the link. In addition to the arms, the brackets are provided with rotation restricting arms protruding downward toward the front side of the vehicle body at both end portions in the left-right direction, and are rotatably supported on the both side portions of the vehicle body frame via support shafts. Has been done. The support shaft is inserted through the shaft center portion of the bracket, and both end portions are fixed to the both side portions of the vehicle body frame. A bearing for rotatably supporting the bracket on the support shaft and a rubber for restricting the rotation of the bracket and reducing vibration are interposed between the support shaft and the inner peripheral surface of the bracket. ing.

The power unit connecting arm provided on the bracket has a power unit pivot shaft rotatably provided at a projecting end through a bearing, and the power unit is connected via the pivot shaft. There is. The rotation restricting arm provided on the bracket is provided with a bolt extending laterally of the vehicle body at an end portion on the projecting side, and is connected to the vehicle body frame via this bolt and rubber fixed to the bolt. .
The bolt is inserted into a through hole formed in the support plate of the vehicle body frame, and is connected to the hole wall surface of the through hole via the rubber.

In the conventional power unit supporting device having such a structure, the link is restricted from rotating with respect to the vehicle body frame by the two rubbers on the left side of the vehicle body and the two rubbers on the right side of the vehicle body, and the power unit is pivoted. It swings up and down around. On the other hand, when the body frame is tilted in the left-right direction, the load in the torsional direction is transmitted from both sides of the body frame to the bracket via the support shaft and the bearing, and the power unit together with the bracket is tilted in the same direction as the body frame. To do.

That is, in this conventional power unit supporting apparatus, the impact and vibration transmitted from the power unit to the vehicle body when the power unit swings is damped by the rubber, and the vehicle body frame is attached to the vehicle body with respect to the power unit. When leaning in the left-right direction, the power unit follows the vehicle body frame with good responsiveness because no rubber is interposed in the load transmission system at this time.

[0007]

However, in the conventional power unit supporting device constructed as described above, the bearing is used to rotatably support the link for connecting the power unit to the body frame. However, there is a problem that the number of parts increases and the cost increases. The bearing is for transmitting a load in the torsional direction to the power unit when the body frame is tilted in the left-right direction at the time of cornering, for example, when the use of the bearing is stopped for cost reduction, In order to maintain the torsional rigidity of the connection between the body frame and power unit,
Some measures must be taken.

The present invention has been made in order to solve the above problems and has a simple structure of the link while maintaining a high rigidity in the torsional direction of the connecting portion between the vehicle body frame and the link for connecting the power unit. The purpose is to support the body frame so that it can swing, and to reduce costs.

[0009]

In order to achieve this object, a power unit supporting device for a scooter type motorcycle according to the present invention is provided on a vehicle body frame side in a power unit connecting link which is swingably supported by a vehicle body frame. A halfway support portion is formed between the swinging base portion and the swinging end portion on the power unit side, and a part of the vehicle body frame is extended to the side of the halfway support portion to support the swinging base portion and the halfway support portion. And an elastic member to elastically support the extended portion.

According to the present invention, the rotation of the link is restricted by the two elastic members mounted on the vehicle body frame, and the impact and vibration transmitted from the power unit to the vehicle body frame via the link are reduced. Further, since the elastic member is positioned outside the vehicle body with respect to the link,
Compared with the case where elastic members are provided on the links on the left side of the vehicle body and the links on the right side of the vehicle body as in the conventional supporting device, the support width of the portion supported by the elastic members, that is, the connecting portion of the body frame and the pair of left and right links The width in the left-right direction can be widened. Therefore, the rigidity of the connecting portion between the body frame and the link in the torsional direction is increased.

A power unit supporting device for a scooter type motorcycle according to a second aspect of the present invention is the power unit supporting device for a scooter type motorcycle according to the first aspect, wherein the link on the left side of the vehicle body and the right side of the vehicle body are provided. The link is provided so as to extend downward from the swing base portion, and the power unit is supported by a rod connecting the swing end portions of these links. According to the present invention, the link and the rod form an upward U-shaped link assembly when viewed from the front-rear direction of the vehicle body.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a power unit supporting device for a scooter type motorcycle according to the present invention will be described below with reference to FIG.
14 to 14 will be described in detail. FIG. 1 is a side view of a scooter type motorcycle adopting a power unit supporting device according to the present invention, FIG. 2 is a plan view of a body frame, FIG. 3 is a side view of a front half of an upper frame, and FIG. 4 is a plan view of the same. Is. 5 is a side view of the rear half of the upper frame, and FIG. 6 is a plan view of the same. FIG. 7 is a side view of the lower frame, and FIG. 8 is a plan view of the same. 9 is a cross-sectional view taken along the line IX-IX of the left down frame in FIG. 3, FIG. 10 is a cross-sectional view taken along the line XX of the front-rear direction extending portion on the left side of the vehicle body in FIG. 5, and FIG.
FIG. 9 is a cross-sectional view taken along line XI-XI of the front-rear direction extending portion on the left side of the vehicle body in FIG. 12 is a perspective view of the vehicle body frame, FIG. 13 is a sectional view taken along line XIII-XIII in FIG. 5, and FIG. 14 is XI in FIG.
It is a V-XIV sectional view taken on the line.

In these figures, reference numeral 1 denotes a scooter type motorcycle (hereinafter, simply referred to as a scooter) according to this embodiment. This scooter 1
A unit swing type power unit 3 having a rear wheel 2 is supported by a rear portion of a vehicle body frame 4 via a link 5 according to the present invention so as to be vertically swingable. In FIG. 1, 6
Indicates a front wheel, 7 indicates a front fork, 8 indicates a steering wheel, 9 indicates a seat, and 10 indicates a vehicle body cover.

The power unit 3 is the same as the one well known in the prior art, in which the engine 11 and the transmission case 12 are integrally formed, and the rear wheel 2 is provided at the rear end of the transmission case 12. It is supported. The rear wheel 2 is a V-belt type automatic transmission (not shown) provided in the transmission case 12.
Power is transmitted from the engine 11 via the.

In FIG. 1, the reference numeral 13 provided above the transmission case 12 is an air cleaner of the engine 11. This power unit 3 includes a crankcase 14
The upper part of the vehicle body frame 4 via the link 5 according to the present invention.
The rear end portion of the transmission case 12 is connected to the rear end portion of the vehicle body frame 4 via the rear cushion unit 15. This rear cushion unit 15
The structure is similar to that well known in the art, and includes a cushion spring and a hydraulic damper (not shown).

The vehicle body frame 4 is an upper frame extending from a head pipe 21 that rotatably supports the front fork 7 and the steering handle 8 to a rear end portion of the vehicle body through a footrest portion 22 and a lower portion of the seat 9. 23 and a lower frame 24 extending downward from the middle of the upper frame 23. The upper frame 2
3 is made of an aluminum alloy, and the lower frame 24 is made of an iron-based alloy. That is, the weight of the vehicle body frame 4 is reduced by forming a part thereof with a relatively lightweight aluminum alloy.

The upper frame 23 is the head pipe 2
A front half portion 25 extending from 1 to the footrest portion 22 and a rear half portion 26 welded to the rear end portion of the front half portion 25 and extending to the rear end portion of the vehicle body are separately formed. As shown in FIGS. 3 and 4, the front half portion 25 includes the head pipe 2
1, a pair of left and right down frames 27 extending rearward and downward from the head pipe 21, and two cross members 28, 2 interposed between the down frames 27.
9 and is formed by so-called gravity casting to integrally form the above respective parts. The gravity casting is a casting method in which a molten metal is filled in a mold by gravity.

As shown in FIG. 9, the down frame 27 is formed in a box shape having a closed cross section. Further, of the two cross members 28 and 29, the front cross member 28 located on the side of the head pipe 21 is formed to have a closed vertical cross-section as shown in FIG. The numeral 29 is formed in a V shape in cross section. A mounting seat 30 for mounting a front end portion of a lower frame 24, which will be described later, is provided in the vicinity of the rear cross member 29 in each of the down frames 27.

The rear half 26 of the upper frame 23 is shown in FIG.
As shown in FIG. 6 and FIG. 6, a left front-rear extending portion 31 and a right front-rear extending portion 32 extending in the front-rear direction of the vehicle body at both end portions in the vehicle width direction, and these front-rear extending portions 3 are formed.
1, 32 are composed of first to third cross members 33 to 35 connecting the front end portion, the central portion, and the rear end portion to each other, and are formed by a vacuum die casting method to integrally form the respective portions. Has been done.

The left and right front and rear extending portions 31, 32 are
A front portion of the power unit 3 is swingably connected in the vertical direction to a center portion of the vehicle body in the front-rear direction via a power unit supporting link 5 described later, and a rear end portion of the front-rear extension portion 31 on the left side of the vehicle body. A cushion unit bracket 36 for connecting the upper end portion of the rear cushion unit is provided in the. In addition, the left and right front and rear extending portions 31, 3
A bracket 37 for connecting an intermediate portion of the lower frame 24, which will be described later, is provided at the front end portion of the No. 2 so as to project downward.

A left-right front-rear extending portion 3 of the rear half portion 26.
Of the first to third cross members 33 to 35 that connect 1 and the right front-rear extension 32, both front-rear extension 31,
First cross member 33 connecting front end portions of 32
And a second cross member 34 that connects the central parts to each other.
Is formed so that a large storage box (not shown) capable of storing a helmet can be mounted between them. That is, the rear surface of the first cross member 33 is formed so as to be gradually positioned forward as it goes to the central portion in the vehicle width direction, and the front surface of the second cross member 34 has both ends in the central portion in the vehicle width direction. It is formed so as to be located behind the part. The storage box has a structure similar to that of a conventional scooter, and the opening of the upper end is opened and closed by the seat 9. As shown in FIG. 12, the third cross member 35 that connects the rear end portions of the left and right frontward and rearward extending portions 31 and 32 is formed in a box shape that opens upward, and is shown in the figure. No batteries are stored.

The rear half 2 comprising the left and right front and rear extending portions 31 and 32 and the first to third cross members 33 to 35.
6 is molded by using different molds for the front part in the range indicated by the symbol A in FIG. 5 and the rear part in the range indicated by the symbol B in FIG. The front part of the rear half part 26 is formed by a mold that divides in the vehicle width direction, and the rear part is formed by a mold that divides in the vertical direction. For this reason, the front portions of the left and right front-back direction extending portions 31 and 32 are formed in a U shape that opens to the side as shown in FIG. 10, and the rear portions are
As shown in FIG. 11, it is formed in a U-shape that opens downward.

By molding the rear half portion 26 with the dies having different dividing directions in this way, the extending portion 3 in the front-rear direction is formed.
It is possible to improve the lateral rigidity of the front portions of the Nos. 1 and 32 and the longitudinal rigidity of the rear portions. The lateral rigidity of the front portions of the front-rear extending portions 31 and 32 is improved because the front portions are the front half portions 2.
While being connected to the two down frames 27 of 5,
This is because the front portion of the power unit 3 is connected and a load is mainly applied in the lateral direction during cornering or the like.

The down frame 27 of the front half portion 25 connected to the front portions of the front-rear extending portions 31 and 32 extends rearward and downward, and the down-frame 27 extends in the front-rear extending portion 3.
Since the front end portions of 1, 32 are firmly supported in the vertical direction,
By combining the front half portion 25 and the rear half portion 26, it is possible to form the upper frame 23 having high rigidity in the torsion direction. In this embodiment, in order to increase the rigidity in the torsional direction only in the front-rear direction extending portions 31 and 32, inside the U-shape in the front portion having a U-shaped cross section, an X-shape in a side view is formed. The reinforcing ribs 38 (see FIGS. 1, 3, 10, and 12) are integrally formed.

The longitudinal rigidity of the rear portions of the front and rear extending portions 31 and 32 is improved because a cushion reaction force is applied from the rear cushion unit 15 to the rear portions. As a result, the allowable value of the cushion reaction force applied from the rear cushion unit 15 to the rear half portion 26 can be increased. In this embodiment, as shown in FIG. 11, vertical walls 40 and 41 are provided so as to project grooves 39 on the upper surfaces of the rear portions of the front-rear direction extending portions 31 and 32. By this groove 39, the rigidity in the vertical direction can be further improved, and
A cable 42 for connecting to other electric components such as a battery and a tail lamp can be stored.

As shown in FIGS. 5, 6 and 13, 14, the power unit supporting link 5 constituting the power unit supporting device according to the present invention has the left and right front and rear extending portions 3 as shown in FIGS.
Cylindrical bosses 5 arranged in the vicinity of the inside of the vehicle body of 1 and 32, and two in each of the front and rear extending portions 31 and 32.
1 and 52 are elastically supported by damper rubbers 53 and 54, which will be described later.

In this embodiment, this link 5
Is a side plate 58 formed into a plate shape by punching.
59, and bosses 55-57 made of a drawn material welded to three end portions of the side plates 58, 59 in the longitudinal direction and an intermediate portion. Of these three bosses 55 to 57, the boss 55 located at the top in FIG. 13 constitutes the swing base S1 of the link 5, and the boss 57 at the lower end constitutes the swing end S2 of the link 5. The boss 56 at the midway portion constitutes the midway support portion S3 of the link 5.

The cylindrical bosses 51 and 52 extend on the rear half portion 26 of the vehicle body frame 4 so as to extend vertically in the lateral direction of the link 5 (see FIGS. 5 and 13).
Are formed on the upper boss 51 while being arranged in the vertical direction.
Is formed so as to be located on the front side of the vehicle body with respect to the lower boss 52. For this reason, the link 5 is inclined so as to extend rearward and downward in this embodiment.

Of the three bosses 55 to 57 of the link 5, the boss 55 at the upper end and the boss 56 at the middle of the boss, as shown in FIG. The shafts 61 and 62 are respectively erected so as to project toward the outer side of the vehicle body, and a support shaft 63 for connecting a power unit is inserted through a boss 57 at a lower end portion which constitutes the swing end portion. The support shafts 61 and 62 for connecting the frame are
The cylindrical bosses 51, 52 of the vehicle body frame 4 are formed of bolts and penetrate the bosses 55, 56 of the link 5.
Through which the head part projects laterally, and the damper rubber assembly 64 provided inside the cylindrical bosses 51, 52,
The center of 65 is fastened to the link 5. As shown in FIGS. 13 and 14, the damper rubber assemblies 64 and 65 have the support shafts 61 and 62 fitted therein, and thus the link 5 is assembled.
Inner cylinders 66, 67 fastened to the cylindrical boss 51,
The outer cylinders 68 and 69 are press-fitted into the inner peripheral surface of 52, and the damper rubbers 53 and 54 interposed between the inner cylinders 66 and 67 and the outer cylinders 68 and 69.

The damper rubbers 53 and 54 are the inner cylinder 6
It is solidified in a state of being filled between 6, 67 and outer cylinders 68, 69, and adhered to the outer peripheral surfaces of the inner cylinders 66, 67 and the inner peripheral surfaces of the outer cylinders 68, 69. That is, the damper rubber assemblies 64 and 65 are press-fitted into the cylindrical bosses 51 and 52 and fastened to the links 5 by the support shafts 61 and 62, so that the damper rubbers 53 and 54 located outside the vehicle body with respect to the links 5. The link 5 is elastically supported by the vehicle body frame 4 via the. The damper rubbers 53, 54 constitute the elastic member according to the present invention.

Further, the damper rubbers 53 and 54 are
As shown in FIG. 14, grooves 71 are formed at two points in the axial center portion so as to be point-symmetrical in a side view. This groove 7
1 is formed so as to extend from one end surface to the other end surface along the axial direction of the damper rubbers 53, 54 (the left-right direction of the vehicle body). In this way, the groove 71 is formed in the damper rubber 5
By forming the damper rubbers 53, 5
The elastic force of No. 4 becomes relatively small at the portions corresponding to these grooves 71.

The grooves 71 of the damper rubbers 53, 54 mounted on the upper cylindrical bosses 51, 52 are formed so as to be aligned along the longitudinal direction of the link 5, and the lower cylindrical bosses 51, 52 are formed.
The grooves 71 of the damper rubbers 53 and 54 mounted on the 52 are formed so as to be aligned in a direction substantially orthogonal to the longitudinal direction of the link 5. Therefore, the upper damper rubbers 53, 54
Has a relatively small elastic force in the longitudinal direction of the link 5, and the damper rubbers 53, 54 on the lower side have a relatively small elastic force in a direction substantially orthogonal to the longitudinal direction of the link 5. Become.

In this way, the groove 71 is formed in the damper rubber 53, 5
4, the link 5 has a swinging end portion in a direction substantially orthogonal to the longitudinal direction (indicated by an arrow R in FIG. 14).
When a load is applied to the upper damper rubber 53,
54, the elastic force becomes relatively large in the same direction, and the elastic force becomes relatively small in the lower damper rubbers 53, 54, so that the link 5 of the vehicle body is centered on the swing base. It becomes easy to swing in the front-back direction.

The shaft 63 for connecting the power unit, which is provided at the swinging end of the link 5, is made of a bolt and, as shown in FIG. 13, two cylinders interposed between the links 5 and 5. Link 5 on the left side of the vehicle body through the spacers 72, 73
To the link 5 on the right side of the vehicle body, and both links 5 and the spacers 72 and 73 are fastened. For this reason,
The link 5 on the left side of the vehicle body and the link 5 on the right side of the vehicle body are connected to each other by a supporting shaft 63 for connecting a power unit, and a U-shaped link assembly 74 is formed which opens upward as viewed from the front-rear direction of the vehicle body. There is.

The spacers 72, 73 are rotatably provided with a sleeve 76 connected to a connecting bracket 75 (see FIG. 1) of the power unit 3 via a slide bearing 77. That is, the power unit 3 swings in the vertical direction with respect to the link 5 and the vehicle body frame 4 as the sleeve 76 rotates with respect to the spacers 72 and 73.

The lower frame 24 of the vehicle body frame 4
Is the upper frame 2 as shown in FIG. 7 and FIG.
A pair of left and right pipes 81, 8 extending in the front-rear direction below 3
2 and the first to fourth cross members 83 to 86 which are laterally bridged between the pipes 81 and 82.

As shown in FIG. 7, each of the pipes 81 and 82 is formed in a mountain shape that is convex downward, and the front end portion is fixed to the front half portion 25 of the upper frame 23 by a fixing bolt 87.
The rear end portion is fixed to the rear half portion 26 of the upper frame 23 via the connecting bracket 88. The connecting bracket 88 is formed in a box shape from an iron-based alloy equivalent to the pipes 81 and 82, the lower end portion is welded to the pipes 81 and 82, and the upper end portion is fixed to the rear half portion 26 by a fixing bolt 89. (See FIG. 1).

A connecting plate 90 is provided at a front end portion of a lower portion of each of the pipes 81 and 82 extending in the front-rear direction, and the connecting plate 90 and the rear half portion 26 are provided. The bracket 37 provided so as to extend downward at the front end portion thereof is fastened with a fixing bolt 91 as shown in FIG. 1 to be supported by the upper frame 23. The left and right pipes 81, 82 are welded with stays 92 to 94 for supporting the lower portion of the vehicle body cover 10, a side stand supporting stay 95, etc., and a radiator 96 via a bracket (not shown).
Is supported.

The radiator 96 is of a horizontal water flow type similar to that well known in the prior art, and as shown in FIGS. 1 and 7, the front end portions of the pipes 81 and 82 extending rearward and downward. It is arranged so as to be inclined downward so as to point to the upper front. In this embodiment, a part of the cooling water passage between the radiator 96 and the engine 11 is formed by the pipes 81 and 82. A cooling water hose connecting the radiator and the pipes 81 and 82 is designated by reference numeral 9.
7, the cooling water hose connecting the pipes 81, 82 and the engine 11 is shown by reference numeral 98 (see FIGS. 1 and 8).

Both pipes 81, 8 of the lower frame 24
First to fourth cross members 83 to 8 for connecting two members
Among the six, the first to third cross members 83 to 85 are formed of steel plates, and the fourth cross member 86 is formed of a pipe. Also, the third cross member 8
As shown in FIG. 8, 5 is formed in an X shape in a plan view, and is welded to both pipes 81, 82 at four positions, front, rear, left and right. A fuel tank 99 is supported on the third cross member 85 as shown in FIG. The fuel tank 99 is housed above the third cross member 85 in a space formed between the fuel tank 99 and the storage box. The fourth cross member 86 is formed in a mountain shape that protrudes downward when viewed from the rear of the vehicle body, and the main stand bracket 100 is welded to the center portion in the vehicle width direction.

In the scooter 1 configured as described above, the rear half portion 26 of the vehicle body frame 4 is located on the side of the link 5 connecting the power unit 3 to the vehicle body frame 4 from the side above the midway portion of the link 5. The two swing rubbers 53, 54 extended to cover the rear half portion 26 elastically support the swing base portion and the middle portion of the link 5 on the rear half portion 26. One damper rubber 53, 54
Thus, the rotation of the link 5 is restricted, and the impact and vibration transmitted from the power unit 3 to the vehicle body frame 4 via the link 5 can be reduced.

The damper rubbers 53 and 54 are the links 5
Since it is positioned on the outer side of the vehicle body, the supporting width of the portion supported by the elastic member is greater than that in the case where the elastic member is provided on the link on the left side of the vehicle body and the link on the right side of the vehicle body as in the conventional power unit supporting device. That is, the width in the left-right direction of the connecting portion between the body frame 4 and the pair of left and right links 5 can be increased. Therefore, the rigidity of the connecting portion between the vehicle body frame 4 and the link 5 in the torsional direction is increased.

Furthermore, the link 5 on the left side of the vehicle body and the link 5 on the right side of the vehicle body are provided so as to extend downward from the swing base portion, and the swing end portions of these links 5 are supported by the support shaft 6.
3 and the link 5 and the support shaft 63 form an upwardly U-shaped link assembly 74 when viewed from the front-rear direction of the vehicle body. Therefore, the lateral rigidity of the link 5 is increased in the front-rear direction. The rocking can be improved without being hindered. In this embodiment, the damper rubber 53,
Since a groove 71 is formed in 54 so that the link 5 can easily swing in the front-back direction, the vibration of the power unit 3 in the front-back direction can be efficiently damped by the link 5 swinging. .

[0044]

As described above, according to the present invention, the two elastic members for connecting the power unit connecting link to the vehicle body frame are positioned outside the vehicle body with respect to the links, and the elastic member is provided on the link. Compared with the case, the supporting width of the portion supported by the elastic member can be made wider. Therefore, although the bearing is not used to rotatably support the link on the body frame,
Since the torsional rigidity of the connecting portion between the vehicle body frame and the link is increased, the number of parts can be reduced and the cost can be reduced as compared with the conventional one while maintaining the same performance as the conventional one.

According to the second aspect of the present invention, since the link and the rod form the upward U-shaped link assembly when viewed from the front-rear direction of the vehicle body, the swinging operation in the front-rear direction is prevented. The lateral rigidity of the link can be improved. Therefore, the rigidity in the twisting direction can be further enhanced, and thus the power unit can be made to follow the vehicle body frame more responsively, for example, during cornering.

[Brief description of drawings]

FIG. 1 is a side view of a scooter type motorcycle that employs a power unit support device according to the present invention.

FIG. 2 is a plan view of a body frame.

FIG. 3 is a side view of a front half of the upper frame.

FIG. 4 is a plan view of the front half of the upper frame.

FIG. 5 is a side view of the rear half of the upper frame.

FIG. 6 is a plan view of the rear half of the upper frame.

FIG. 7 is a side view of the lower frame.

FIG. 8 is a plan view of a lower frame.

9 is a sectional view taken along line IX-IX of the left down frame in FIG.

FIG. 10 shows a front-rear extending portion on the left side of the vehicle body in FIG.
It is a XX sectional view.

11 is a longitudinally extending portion XI on the left side of the vehicle body in FIG.
It is a XI line sectional view.

FIG. 12 is a perspective view of a body frame.

13 is a sectional view taken along line XIII-XIII in FIG.

14 is a sectional view taken along line XIV-XIV in FIG.

[Explanation of symbols]

3 ... power unit, 4 ... vehicle body frame, 5 ... link, 2
3 ... Upper frame, 26 ... Rear half, 51, 52 ... Cylindrical boss, 53, 54 ... Damper rubber, 55-57 ... Boss, 61-63 ... Spindle, S1 ... Swing base, S2 ... Swing End, S3 ... Midway support.

Claims (2)

[Claims] 1. A scooter in which a unit swing type power unit is swingably supported by swing end portions of a pair of left and right links swingably supported by a vehicle body frame, and swing of the links is restricted by an elastic member. A power unit supporting device for a two-wheeled motor vehicle, wherein a midway supporting portion is formed between a rocking base portion on the vehicle body frame side and a rocking end portion on the power unit side in the link, and a side portion of the midway supporting portion is formed. A power unit supporting device for a scooter type motorcycle, wherein a part of the vehicle body frame is extended, and the swing base portion and the midway support portion are elastically supported by the extended portion by an elastic member. 2. The power unit supporting device for a scooter type motorcycle according to claim 1, wherein a link on the left side of the vehicle body and a link on the right side of the vehicle body are provided so as to extend downward from a swing base portion, and the links swing. A power unit support device for a scooter-type motorcycle in which a power unit is supported by a rod that connects the ends.