JPH08207867A - Engine supporting structure for motorcycle - Google Patents

Abstract

PURPOSE: To provide a lightweight and compact engine hanger. CONSTITUTION: An engine hanger 7 is formed into a nearly T-shape when viewed from the side, a mounting hole 40 and a mounting hole 41 are provided in front and in the rear of the upper part, and small round parts 43 are provided at the lower end part. A narrow part 50 is provided in the intermediate part, and the center 51 of torsion is located at the smallest width part of this part. Thus, the width of vertical deflection is reduced, and the rigidity of the whole engine hanger 7 can be reduced. As a result, the engine hanger becomes lightweight and compact.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine support structure for a motorcycle.

[0002]

2. Description of the Related Art In Japanese Utility Model Publication No. 62-66898, automatic 2
An engine hanger is provided integrally with the radiator mounting stay of the wheeled vehicle, and the upper end is attached to the main frame at two front and rear locations.
It is shown connected to the engine at one lower end. .

[0003]

By the way, since the engine hanger supports an engine which is a vibrating body, a considerably large rigidity is required, and as a result, the engine hanger becomes large and heavy. Therefore, the present invention provides an engine hanger that can support the engine with such a large rigidity.

[0004]

In order to solve the above problems, an engine support structure for a motorcycle according to the present invention is
The engine hanger is characterized in that a minimum width portion is provided at an intermediate portion in the vertical direction, and a twist center of the engine hanger is located in the minimum width portion.

At this time, the lightening portion may be provided above the minimum width portion of the engine hanger. The lightening portion in the present invention includes both a hole and a thin portion.

[0006]

When the vehicle body and the engine vibrate, the center of the screw of the engine hanger is located in the minimum width portion of the intermediate portion in the vertical direction, so that the vertical amplitudes are reduced. Therefore, the rigidity of the entire engine hanger can be reduced, and as a result, the entire engine hanger can be made lightweight and compact.

At this time, if the lightening portion is provided above the minimum width portion of the engine hanger, the twist center can be freely adjusted so as to move to the main frame side.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described with reference to the drawings. FIG. 3 shows a front side surface of a motorcycle having a diamond type frame structure according to an embodiment.

In this figure, an upper portion of a front fork 2 supporting a front wheel 1 is connected to a head pipe 3 and steered by a handle 4. A main frame 5 extends rearward from the head pipe 3, and a fuel tank 6 is supported thereon. An upper part of an upper engine hanger 7 protruding downward is attached to a side surface of the main frame 5.

The engine hanger 7 is substantially T-shaped when viewed from the side and is the subject of the present invention. The lower end portion of the engine hanger 7 is connected to a mounting portion 9 provided on a cylinder head cover 8 of a 4-cycle engine. .

A carburetor 11 is connected to the intake side of a cylinder head 10 of this engine, and its upstream side is connected to an air cleaner 12. Further, the exhaust pipe 13 is provided on the exhaust side.
Is connected.

The crankcase 15 to which the cylinder block 14 is attached has a down pipe 1 which is disposed diagonally above and below the head pipe 3 in front of the engine.
Attached to the front mount bracket 17 at the lower end of 6. Reference numerals 18 and 19 are mount portions thereof.

Further, the rear portion of the transmission case 20 integrated with the crankcase 15 is vertically arranged from the rear end portion of the main frame 5 to the pivot frame 21 which is bifurcated to the left and right and extends vertically by mount portions 22 and 23. It is installed.

A drive sprocket 24 provided on the mission case 20 drives a driven sprocket (all not shown) for the rear wheels via a chain 25. A front end portion of a rear swing arm 27 is rotatably supported on the pivot portion 26 of the pivot frame 21.

FIG. 4 is a view in which a portion of the main frame 5 to which the engine hanger 7 is attached is cut away from above. The main frame 5 is arranged in the front-rear direction along the center of the vehicle body, and a pair of engine hangers 7 are attached to both sides of the main frame 5.

The engine hanger 7 is a main frame 5
Abutting on each end of a pair of front and rear collars 30 that cross the
It is fixed with a bolt 31 and a nut 32, respectively.

A lower portion of the engine hanger 7 extends downward, and a lower end portion of the engine hanger 7 is similarly fixed to both ends of a collar 33 that traverses the engine mounting portion 9 in the vehicle width direction with bolts 34 and nuts 35.

FIG. 1 is a side view of the engine hanger 7, FIG.
FIG. 2 is a sectional view taken along line 2-2. As shown in these drawings, the engine hanger 7 is a plate-shaped member, and mounting holes 40, 41, and 42 are formed in the front and rear portions and the lower portion of the lower portion, respectively.

Upper front mounting hole 40 and upper rear mounting hole 4
The end portions near 1 are small radius portions 43 and 44, and the end portions near the lower mounting hole 42 are large radius portions 45.

An upper end connecting the small rounded portion 43 and the small rounded portion 44 forms a rounded portion 46 curved inward of the engine hanger 7, and a front end portion and a small rounded portion 44 connecting the small rounded portion 43 and the large rounded portion 45. The rear ends connecting the large radius portion 45 and the large radius portion 45 are also large radius portions 47 and 48 that curve inward of the engine hanger 7, respectively.

Below the line L1 connecting the centers of the mounting holes 40 and 41, there is formed a constricted portion 50 formed by the rounded portions 47 and the rounded portions 48, and the twisted portion is formed in the portion having the smallest width. A center 51 is formed above the mounting hole 42.

A line L connecting the mounting hole 42 with a substantially midpoint of the line L1.
In FIG. 2, lightening holes 52 are formed in the vicinity of the mounting holes 40 and 41. Reference numeral 53 is a strainer stay.

The small radius portion 43, the small radius portion 44, the radius portions 46, and the radius portion 48 reduce the rigidity of the upper portion of the engine hanger 7. In addition, since the lightening hole 52 is formed on the upper side, the twist center 51 is set to move relatively upward and become the minimum width portion of the constricted portion 50.

The position of the twist center 51 can be easily adjusted by changing the position and size of the lightening hole 52. The plate thickness of the engine hanger 7 is set according to the magnitude of rigidity required for each vehicle type.

Next, the operation of this embodiment will be described. When the upper and lower mounting portions of the engine hanger 7 vibrate in the vehicle width direction due to the vibration of the engine and the vehicle body, the torsion center 51 is located at the vertical middle portion of the engine hanger 7, so that the swing width of each becomes small.

In addition, since the rigidity of the engine hanger 7 as a whole can be reduced, it can be made light and compact.

Moreover, the position of the twist center can be easily adjusted by changing the position and size of the lightening hole 52.

The invention of the present application is not limited to the above-described embodiments, but can be applied in various ways. For example, the engine hanger 7 is not limited to a flat plate, but can be bent so as to form a substantially crank shape in the vertical cross section of FIG. Also, the mounting collar can be welded in advance to all or some of the mounting holes.

Further, by making either one of the rounded portion 47 and the rounded portion 48 linear, the side view shape can be made substantially L-shaped. Similarly, various variations such as a Y-shape and a P-shape are possible.

Moreover, the frame shape to be applied is not limited to the diamond type, but may be a credor type.

Further, it is not always necessary to provide the lightening hole 52 of the embodiment, and the position of the twist center can be adjusted by changing the shape and the thickness. In addition, the thinned portion 52 can be replaced with a thin portion.

[0032]

According to the engine support structure for a motorcycle according to the present invention, a minimum width portion is provided at an intermediate portion in the vertical direction of the engine hanger, and the twist center of the engine hanger is located in this minimum width portion.

Therefore, when the vehicle body and the engine vibrate, the center of the screw of the engine hanger is located in the minimum width portion of the intermediate portion in the vertical direction, so that the vertical amplitudes can be made small and the vehicle body vibration becomes small. Moreover, the rigidity of the entire engine hanger can be reduced, and as a result, the entire engine hanger can be made light and compact.

At this time, if the lightening portion is provided above the minimum width portion of the engine hanger, the position of the twist center can be freely adjusted so as to move to the main frame side.

[Brief description of drawings]

FIG. 1 is a side view of an engine hanger according to an embodiment.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a side view of the entire motorcycle to which the embodiment is applied.

FIG. 4 is a view showing the vicinity of the mounting portion of the engine hanger of the main frame

[Explanation of symbols]

5: Main frame, 7: Engine hanger, 8: Cylinder head cover, 9: Mounting part, 40: Mounting hole, 41:
Mounting hole, 42: mounting hole, 50: constricted portion, 51: twist center, 52: lightening hole

Claims (2)

[Claims] 1. A main frame extending rearward from a head pipe, an engine arranged below the main frame, and an upper end attached to the main frame and a lower end attached to the engine to suspend the engine on the main frame. A motorcycle having a supporting engine hanger, characterized in that a minimum width portion is provided at an intermediate portion in the vertical direction of the engine hanger, and a twist center of the engine hanger is positioned at the minimum width portion. Car engine support structure. 2. The engine support structure for a motorcycle according to claim 1, wherein a lightening portion is provided above the minimum width portion.