JPH10236376A - Motorcycle engine suspension - Google Patents

Abstract

(57) Abstract: Down tubes (43) extend downward from a head pipe of a vehicle body frame, and a pair of left and right hanger plates (71) extend rearward from the down tubes. A predetermined length of sufficiently rigid collars 73, 73 are extended from the vehicle to the side of the vehicle, and front hanger portions 63, 63 of the engine 10 having a vertically extending cylinder are superimposed on the outer end surfaces of these collars. The hanger part and the rear end of the hanger plate were connected by bolts 74, 74 penetrating the collar. [Effect] The engine suspension device such as the hanger plate and the collar fits inward from the outer surface of the engine, and there is no need to increase the width of the body frame. Therefore, the width of the motorcycle does not increase.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motorcycle engine suspension.

[0002]

2. Description of the Related Art As an engine suspension system for a motorcycle,
For example, JP-A-2-38198 entitled "Engine Suspension Spacer" is available. According to the above prior art, according to FIGS. 4 to 6 of the publication, an engine mount plate E is bolted to an outer surface of a vehicle body frame B (the reference numeral is cited in the publication. The same applies hereinafter). The spacers C, F having a predetermined length are extended from the rear end of the engine mount plate E toward the center of the vehicle, and the engine A is suspended via the spacers C, F. According to the prior art, according to FIG. 1 of the publication, an engine mount plate 3 is bolted to an outer surface of a vehicle body frame 2 and a predetermined length is set from a rear end of the engine mount plate 3 toward a vehicle center. The spacer 10 is extended.
Is used to suspend the engine 1.

There are the following three suspension systems. A system shown in FIG. 1 of the publication; a suspension system in which the engine 1 and the engine mount plate 3 are connected by bolts and nuts 5 and 6 via a semi-rigid cylindrical spacer 10. The cylindrical spacer 10 is formed by laminating a plurality of unit plate members 11.
Furthermore, it is a spacer in which the conveyed surface is covered with a flexible material. A system shown in FIG. 5 of the gazette; a suspension system in which an engine A and an engine mount plate E are connected by bolts and nuts D via a metallic tubular spacer C. 6, a suspension system in which an engine A and an engine mount plate E are connected by bolts and nuts G via a cylindrical spacer F made of an elastic material such as rubber.

[0004] The above prior art and the engine 1,
Since A and the body frames 2 and B are semi-fixedly connected,
The engine 1, A itself can also serve as a strength member of the body frames 2, B to some extent, and the rigidity of the body frame 2 can be increased. Further, since the connection is semi-fixed, the vibrations of the engines 1 and A can be attenuated to some extent.

[0005]

However, the prior art described above is different from the prior art in that an engine mount plate 3, E is superimposed on the outer surface of a body frame 2, B, and a predetermined length from the engine mount plate 3, E toward the vehicle center. Spacer 1
The spacers 0 and C are extended, and the brackets of the engines 1 and A are overlapped on the inner end faces of the spacers 10 and C. For this reason, since the engine mount plates 3, E and the spacers 10, C protrude from the outer surfaces of the engines 1, A, the width of the body frames 2, B must be increased accordingly. Due to the large frame width, the motorcycle becomes large. On the other hand, it is possible to arrange the brackets of the engines 1 and A near the center of the vehicle, but the mounting positions of the brackets are limited, which is not advantageous. Also,
In the above-described conventional technique, the vibration of the engine A is absorbed by the spacer F made of an elastic material, so that a high damping effect can be obtained, but the engine A cannot assist the rigidity of the body frame B.

It is an object of the present invention to secure the rigidity of the body frame without increasing the size of the motorcycle and to reduce the vibration transmitted from the engine to the body frame to improve the ride comfort.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, a down tube is extended downward from a head pipe of a vehicle body frame, and a pair of right and left hanger plates is extended rearward from the down tube. Procrastinate,
From the rear end of the hanger plate, a sufficiently rigid collar of a predetermined length is extended to the side of the vehicle, and the front hanger portion of an engine having a vertically extending cylinder is overlapped on the outer end surface of the collar. The hanger portion and the rear end of the hanger plate are connected by a bolt penetrating the collar.

Since a collar of a predetermined length is extended from the rear end of the hanger plate to the side of the vehicle, and the front hanger portion of the engine is overlapped on the outer end surface of the collar, the engine suspension device such as the hanger plate or the collar is provided. It fits inside the outer surface of the engine, and there is no need to increase the width of the body frame. Therefore, the width of the motorcycle does not increase. In addition, the appearance of the motorcycle is improved because the engine suspension device is accommodated inside the outer surface of the engine. Further, since the front hanger portion can be provided in the vicinity of the end of the engine case having high rigidity, the engine itself can sufficiently serve as a strength member of the vehicle body frame.

Furthermore, a collar having a predetermined length and having sufficient rigidity is extended from the rear end of the hanger plate to the side of the vehicle, and a front hanger portion of the engine is overlapped on the outer end surface of the collar. Since the rear end of the hanger plate is connected to the rear end of the hanger plate by a bolt penetrating through the collar, the collar and the bolt extending from the hanger plate to the side of the vehicle attenuate the vertical vibration of the engine. For this reason, it is difficult for the vibration in the vertical direction to be transmitted to the down tube, and as a result, the vibration is not easily transmitted to the handle. Since the vibration of the steering wheel is reduced, riding comfort is good.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that "before", "after",
“Left”, “right”, “up”, and “down” follow the direction viewed from the driver, and Fr indicates the front side, Rr indicates the rear side, L indicates the left side, and R indicates the right side. Also, the drawings should be viewed in the direction of reference numerals.

FIG. 1 is a side view of a motorcycle according to the present invention. The motorcycle 1 includes a cradle-type body frame 2 and
A front fork 4 attached to the head pipe 3 of the body frame 2, a front wheel 5 and a front fender 6 attached to the front fork 4, a handle 7 connected to the front fork 4, and a front upper portion of the body frame 2 The fuel tank 8 is mounted, a seat 9 (double seat having a driver's seat and a passenger seat) mounted on the upper rear part of the body frame 2 and a cradle space surrounded by each pipe of the body frame 2. 4 cycle engine 1
0, an air cleaner 11 arranged behind the cradle space and below the seat 9, a carburetor 12 connected between the air cleaner 11 and an intake port of the engine 10, and an exhaust pipe 13 connected to an exhaust port of the engine 10. , A collecting chamber 14 and a silencer 15, a radiator 16 disposed in front of the engine 10, a swing arm 17 attached to a rear portion of the body frame 2 via a pivot 2 a, and a rear end of the swing arm 17 attached to the body frame 2. It comprises a suspended rear suspension 18 and a rear wheel 19 attached to the swing arm 17. In the figure, 21 is a step bracket, 22 is a stand, and 23 is a rear grab rail.

FIG. 2 is a plan view of the motorcycle according to the present invention. The rear side portions of the body frame 2 shown in FIG. 1 are covered with side covers 26, 26 and auxiliary side covers 27, 27, A rear fender 28 is put on the rear fender 28 and a rear cowl 29 is put on the rear fender 28. The rear cowl 29 is a cover member that covers the body frame 2 around the rear part of the seat 9. In the figure, 31 is a headlamp, 32 and 32 are front turn signals, 33 and 3
4 is a meter, 35 is a tail lamp, 36 and 36 are rear turn signals, and 37 and 37 are steps.

FIG. 3 is a perspective view of a vehicle body frame according to the present invention.
It is a double cradle type frame having 3,43.
More specifically, the vehicle body frame 2 includes a head pipe 3, one main pipe 41 extending rearward from the head pipe 3, bending downward from the rear end thereof, and hanging down from the lower end thereof, and extending from the lower end of the main pipe 41 to both sides in the vehicle width direction. Main cross pipe 42 and a pair of left and right down tubes 4 hanging down from the head pipe 3 and extending rearward while bending from the lower end thereof
3 and 43, a pair of left and right connecting members 44 and 44 connecting the front and rear intermediate portions of the pair of down tubes 43 and 43 and both ends of the main cross pipe 42, and extend rearward from the rear portion of the main pipe 41. It comprises a pair of left and right seat rails 45,45. A pair of seat rails 45, 45
Extends rearward from the rear part of the body frame 2.

The main pipe 41 is a square pipe. The pair of down tubes 43 also serves as a stay for supporting rear portions of the pair of seat rails 45. In the figure, 46 ... (... indicate a plurality; the same applies hereinafter) are cross members, 47, 47 are rear suspension receiving portions, 51 ... are front receiving pipes of the engine, 52, 53 are rear upper receiving brackets of the engine, 54 and 55 are rear lower receiving brackets of the engine, 56 and 56 are pivot arm receiving portions for a swing arm, 57 is a bracket for a stand, 58 and 58 are mounting bosses for a rear grab rail, and 59 and 59 are receiving brackets for a rear grab rail. is there.

FIG. 4 is a side view (a sectional view of a main part) of an engine according to the present invention. The four-stroke engine 10 is a vertical engine in which four cylinders 61 extending in the vertical direction are arranged in the front and rear directions in the figure. The axis of the cylinder 61 is indicated by L. The crankcase 62 of the engine 10 includes front hanger portions 63, 63 (only one on the left is shown in this figure; the same applies hereinafter), rear upper hanger portions 64, 64, and rear lower hanger portions 65, 65. It is formed two by two.
In the figure, 66 is a piston, 67 is a cylinder block, 68
Is a cylinder head, and 69 is a head cover.

FIG. 5 is a side view of the main part of the front part of the motorcycle according to the present invention, in which hanger plates 71, 71 are attached to left and right front receiving pipes 51 (only the left side is shown in this figure; the same applies hereinafter). The front hanger portions 63, 63 are suspended through the rear, the rear upper hanger portions 64, 64 are suspended on the left and right rear upper receiving brackets 52, 53, and the rear lower hanger portion 65 is suspended on the left and right rear lower receiving brackets 54, 55. , 65 are suspended so that the engine 10 is suspended on the vehicle body frame 2.

FIG. 6 is a sectional view taken along the line 6-6 in FIG. 5, and shows the detailed structure of the suspension of the front hanger portions 63, 63 (the suspension at the front of the engine). The left and right front receiving pipes 51 arranged two by two in the upper and lower sides (only one upper part is shown in this figure) are pipes which are welded by penetrating the down tubes 43, 43 in the left and right direction. The pipe is
A pair of hanger plates 7 on the left and right sides facing each other
Bolts and nuts 7
2, 72 connected.

The suspension system at the front of the engine extends left and right hanger plates 71, 71 rearward from the front receiving pipes 51 of the down tubes 43, 43, from the outer end faces of the rear ends of the hanger plates 71, 71. The collars 73, 73 of a predetermined length are extended to the side of the vehicle (outward in the vehicle width direction), and the inner end surfaces of the front hanger portions 63, 63 are overlapped on the outer end surfaces of the collars 73, 73. Bolts and nuts 74, 74 penetrating the collars 73, 63 with the rear ends of the hanger plates 71, 71.
It is a suspension device connected by.

The collars 73 are made of a pipe having sufficient rigidity, and are made of, for example, a metal material such as a perforated bar or a steel pipe. The length of the collars 73, 73 depends on the rigidity of the collars 73, 73, the rigidity of the bolts / nuts 74, 74,
It is determined in consideration of the tightening force of the bolts / nuts 74, 74, and is set to, for example, about 5 to 6 times the bolt diameter and about 2 to 3 times the outer diameter of the collar.

Thus, the hanger plates 71, 71
The collars 73, 73 of a predetermined length are extended from the rear end to the side of the vehicle, and the front hanger portions 63, 63 of the engine 10 are overlapped on the outer end surfaces of the collars 73, 73. The suspension devices at the front of the engine, such as the collar and the collars 73, 73, fit inside the outer surface of the engine 10 and do not require the width of the body frame 2 to be increased. Therefore, the width of the motorcycle does not increase. Also, the suspension at the front of the engine is
The inside of the motorcycle is placed inside the outside, so that the appearance of the motorcycle is enhanced. Further, front hanger portions 63, 63 of the crankcase (engine case) 62 can be provided near the end portions (corner portions) 62a, 62a having high rigidity. It can sufficiently serve as a strength member.

Next, the operation of the above-structured front suspension system will be described with reference to FIGS. 6 and 7. FIG. In FIG. 6, the collars 73, 73 and the bolts 74, 74 are in a state in which one end is fixed to the hanger plates 71, 71. When vibration is transmitted from the front hanger portions 63, 63 to the other end, they are slightly bent. Absorb vibration.

FIG. 7 is an operation view of the suspension system for the front part of the engine according to the present invention. The axis L of the cylinder of the engine 10 extends vertically. In the engine 10, generally, the vibration A in the direction of the axis L of the cylinder (the vibration A in the vertical direction) tends to be particularly large. Since the down tube 43 has high rigidity in the vertical direction, it is difficult to absorb vibration. On the other hand, in the suspension system according to the embodiment of the present invention, the vertical vibration A is absorbed by the collar 73 and the bolt 74 being slightly bent in the vibration direction. Therefore, the vibration A in the vertical direction is not easily transmitted to the down tube 43. As a result, the vertical vibration transmitted from the down tube 43 to the handle 7 via the head pipe 3 is reduced, so that the riding comfort is good.

On the other hand, the vibration B of the engine 10 in the front-rear direction
Is connected to the down tube 43 via the hanger plate 71.
Transmitted in a direction substantially orthogonal to. For this reason, the vibration B in the front-rear direction is absorbed by the bending of the elongated down tube 43, so that it is difficult for the vibration B to be transmitted from the head pipe 3 to the handle 7. Therefore, the riding comfort is good.

Next, results of comparison between the two conventional suspension systems and the suspension system according to the embodiment of the present invention will be described. (1) Comparative Example 1: Conventional fixed suspension system A suspension system in which a front hanger portion of an engine is directly bolted to a hanger plate of a down tube. (2) Comparative Example 2: Conventional floating suspension system A suspension system in which a front hanger portion of an engine is bolted to a hanger plate of a down tube via a cylindrical spacer made of an elastic material such as rubber. (3) Example: Suspension system according to the embodiment of the present invention

First, the rate at which the vertical vibration of the engine 10 is transmitted to the down tube (vibration transmission rate) is as follows. Assuming that the vibration transmissibility of Comparative Example 1 was 100%, the vibration transmissibility of Comparative Example 2 was about 20%, and the vibration transmissivity of the example was about 40%. From this, it was recognized that the examples could sufficiently absorb vibration.

Next, the ratio of the role of the engine itself as the strength member of the vehicle body frame was as follows. Assuming that the vertical stiffness of the front part in the vehicle body frame of Comparative Example 1 is 100%, the bending stiffness of Comparative Example 2 is 50%.
%, But the bending stiffness of the example was only reduced by about 20%. From this, it was recognized that in the embodiment, the engine itself sufficiently plays the role of the strength member of the body frame.

In the above embodiment, the pair of left and right hanger plates 71, 71
Any structure may be used as long as it can suspend the members 3 and 63. In addition to a hanger made of a plate, a hanger made of, for example, a bar or a pipe may be used. The pair of left and right hanger plates 71, 71 is not limited to a structure that is bolted to the down tubes 43, 43 via the front receiving pipes 51, for example.
Riveting or direct welding may be used. Bolts and nuts 74, 74 penetrating the collars 73, 73
The combination of the stepped bolt and nut allows the collar 7
3, 73 may be used. The engine case provided with the front hanger portions 63, 63 may be any member that constitutes the case of the engine 10, and in addition to the crankcase 62, for example, the cylinder block 67
It may be.

[0028]

According to the present invention, the following effects are exhibited by the above configuration. According to the first aspect of the present invention, a down tube extends downward from a head pipe of a vehicle body frame, a pair of left and right hanger plates extend rearward from the down tube, and a predetermined length extends from a rear end of the hanger plate to a side of the vehicle. The collars having sufficient rigidity are extended, and the front hanger portions of the engine having vertically extending cylinders are overlapped on the outer end faces of the collars, and the front hanger portions and the rear end portions of the hanger plates pass through the collars. It is characterized by being connected by bolts.

The collar of a predetermined length is extended from the rear end of the hanger plate to the side of the vehicle, and the front hanger portion of the engine is overlapped on the outer end surface of the collar. It fits inside the outer surface of the engine, and there is no need to increase the width of the body frame. Therefore, the width of the motorcycle does not increase. In addition, the appearance of the motorcycle is improved because the engine suspension device is accommodated inside the outer surface of the engine. Further, since the front hanger portion can be provided in the vicinity of the end of the engine case having high rigidity, the engine itself can sufficiently serve as a strength member of the vehicle body frame.

Furthermore, a collar having a predetermined length and having sufficient rigidity is extended from the rear end of the hanger plate to the side of the vehicle, and a front hanger portion of the engine is overlapped on the outer end surface of the collar. Since the rear end of the hanger plate is connected to the rear end of the hanger plate by a bolt penetrating through the collar, the collar and the bolt extending from the hanger plate to the side of the vehicle attenuate the vertical vibration of the engine. For this reason, it is difficult for the vibration in the vertical direction to be transmitted to the down tube, and as a result, the vibration is not easily transmitted to the handle. Since the vibration of the steering wheel is reduced, riding comfort is good.

[Brief description of the drawings]

FIG. 1 is a side view of a motorcycle according to the present invention.

FIG. 2 is a plan view of the motorcycle according to the present invention.

FIG. 3 is a perspective view of a vehicle body frame according to the present invention.

FIG. 4 is a side view (a cross-sectional view of a main part) of an engine according to the present invention.

FIG. 5 is a side view of a main part of a front part of the motorcycle according to the present invention.

FIG. 6 is a sectional view taken along line 6-6 in FIG. 5;

FIG. 7 is an operation view of a suspension device for an engine front according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Motorcycle, 2 ... Body frame, 3 ... Head pipe, 10 ... Engine, 43 ... Down tube, 51 ... Front receiving pipe, 61 ... Cylinder, 62 ... Crank case, 63 ... Front hanger part, 71 ... Hanger plate,
72: bolts and nuts, 73: collars, 74: bolts
Nut, L: The axis of the cylinder.

Claims (1)

[Claims] 1. A down tube extends downward from a head pipe of a vehicle body frame, and a pair of left and right hanger plates extends rearward from the down tube. A rigid collar is extended, and a front hanger portion of an engine having a cylinder extending vertically is overlapped on the outer end surface of the collar, and the front hanger portion and the rear end of the hanger plate are bolted through the collar. An engine suspension device for a motorcycle, wherein the engine suspension device is connected.