JP2000108994A - Outboard motor mounting structure - Google Patents

Abstract

(57) [Problem] To provide an outboard motor mounting structure capable of sufficiently absorbing engine vibration while receiving a load in a thrust direction. In an outboard motor mounted on a bracket fixed to a ship via a mounting device, the mounting device is configured by disposing an elastic body around a support member. The cross-sectional shape is a cross shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outboard motor mounting structure.

[0002]

2. Description of the Related Art An outboard motor is generally mounted on a hull of a ship via a bracket. In addition, a mounting device made of an elastic material such as rubber is interposed between the outboard motor and the bracket so that the thrust force generated by the engine of the outboard motor is received and vibration generated by the engine is not transmitted to the boat. ing.

[0003] As a structure of the mounting device, for example, FIG.
As shown in FIGS. 1 (a) and 1 (b), it is common to arrange a cylindrical outer tube Ta and an inner tube Tb concentrically and arrange an elastic body G such as rubber between both tubes Ta and Tb. It is.

[0004]

However, in the above-described structure of the mounting apparatus, the elastic body must be hardened to some extent in order to receive a load in the thrust direction. The vertical and horizontal vibrations sometimes generated cannot be sufficiently absorbed. On the other hand, if the elastic body is softened, the vibration of the engine can be absorbed, but the displacement in the thrust direction becomes large and the durability is impaired.

The present invention has been made in view of the above circumstances, and has as its object to provide a mount structure for an outboard motor capable of sufficiently absorbing vibration of an engine while receiving a load in a thrust direction.

[0006]

According to a first aspect of the present invention, there is provided a mounting structure for an outboard motor through a mounting device mounted on a bracket fixed to a boat. In the outboard motor mounted by means of an outboard motor, the mounting device is configured by disposing an elastic body around a support member, and the elastic body has a cross-sectional shape.

In order to solve the above-mentioned problem, the elastic body has four projections adjacent to each other at an angle of 90 degrees with each other, and the cross-sectional length of one surface of the elastic body is reduced. The cross-sectional length of the protrusion located on the short surface side is smaller than the cross-sectional length of the adjacent surface, and is larger than the cross-sectional width of the protrusion located on the long surface side.

Further, in order to solve the above-mentioned problems,
According to a third aspect of the present invention, the cross section of the housing for accommodating the mounting device including the elastic body having a cross shape is a polygon.

Further, in order to solve the above-mentioned problem, the cross section of the housing is made quadrangular as described in claim 4.

[0010] In order to solve the above-mentioned problems,
As described in claim 5, the cross section of the housing is octagonal.

According to another aspect of the present invention, there is provided an outboard motor mounted on a bracket fixed to a ship via a mounting device, wherein the mounting device includes a support member. The elastic body is disposed around the periphery of the elastic member, the cross-sectional shape of the elastic body is a cylindrical cross shape, and the shape of a housing for housing the mounting device is a cylindrical shape.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a left side view showing an example of an outboard motor to which the present invention is applied. As shown in FIG. 1, the outboard motor 1 includes an engine holder 2, and an engine 4 having a crankshaft 3 in a vertical direction is installed inside the engine holder 2.

An oil pan 5 for storing lubricating oil is arranged below the engine holder 2, and a shaft housing 6 is arranged below the oil pan 5. A drive shaft 7 connected to a lower end of the crankshaft 3 is disposed in the shaft housing 6 and extends downward. The drive shaft 7 is configured to rotationally drive a propeller 11 via a bevel gear 9 and a propeller shaft 10 in a gear case 8 provided below the shaft housing 6. The outboard motor 1 is mounted on a hull of a ship (not shown) via a bracket 12.

FIG. 2 is an enlarged longitudinal sectional view of the central portion of the outboard motor 1. FIG. 3 is a view taken in the direction of the arrow III in FIG. 2, and FIG.
FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2. As shown in FIGS. 1 to 4, the bracket 12 includes a clamp portion 13 and a swivel portion 14. The swivel part 14 has a double pipe structure composed of an inner pipe 15 and an outer pipe 16. The outer pipe 16 is fixed to the clamp part 13 fixed to the boat, and the inner pipe 15 is fixed to the outboard motor 1. Thus, the outboard motor 1 can be steered left and right. The inner pipe 15 is attached to the outboard motor 1 via, for example, two upper and lower portions via a mounting device 17.

As shown in FIG. 3, the upper part of the swivel part 14 is mounted to a pair of left and right upper mounting devices 17a provided on the engine holder 2 via mounting bolts 18. The upper mount device 17a is housed in an upper housing 20 which is split vertically with the upper mount cover 19, for example.

On the other hand, as shown in FIG.
Is mounted via a mounting bolt 18 to a pair of left and right lower mounting devices 17b provided in the shaft housing 6. The lower mount device 17b is housed in a lower housing 22 that is divided into right and left together with the lower mount cover 21, for example.

FIGS. 5A and 5B are a side view and a front view of the mounting device 17 according to the first embodiment of the present invention. As shown in FIGS. 5A and 5B, the mounting device 17 includes a cylindrical inner tube 2 serving as a support member.
The elastic body 24 made of rubber or the like is disposed around the periphery of the elastic member 3.
The edges of the protruding portions 25 that are adjacent and face each other at an angle of degrees are set in a parallel cross shape. The elastic body 24 has a length L and a hardness in the thrust direction sufficient to receive a load in the thrust direction, and has a dimension of a sectional shape, that is, a sectional width A of the elastic body 24, a sectional height B of the elastic body 24, The cross-sectional width a of the protrusion 25 located in the width direction of the elastic body 24, the cross-sectional height b of the protrusion 25 located in the height direction of the elastic body 24, and the fillet formed between the adjacent protrusions 25 Is set to a size that can sufficiently absorb vertical and horizontal vibrations generated when the engine 4 rotates at a low speed. In the first embodiment, the sectional width A of the elastic body 24 and the sectional height B of the elastic body 24, the sectional width a of the protrusion 25 located in the width direction of the elastic body 24, and the height of the elastic body 24. Height b of the projection 25 located in the vertical direction
Are set to be the same (A = B, a = b).

FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 4, and shows a first state in which the lower mount device 17 b is housed in the lower housing 22 of the shaft housing 6 and fixed by the lower mount cover 21. An example will be described. As shown in FIG. 6, the lower housing 22 formed by the shaft housing 6 and the lower mount cover 21 has a polygonal cross section, and in the first embodiment, an octagon.

The cross section of the lower mounting device 17b is arranged in the lower housing 22 in a cross shape. As shown in FIG. 7, which is a second example of the first embodiment, the lower mounting device 17b is It is also possible to rotate by 45 degrees and arrange so that the cross section becomes an X-shape. If it is not necessary to rotate the lower mount device 17b, the cross section of the lower housing 22 may be square (see FIG. 10 described later).

FIGS. 8A and 8B are a side view and a front view of a mount device 117 according to a second embodiment of the present invention. As shown in FIGS. 8A and 8B, the mounting device 117 has an elastic body 124 made of rubber or the like disposed around a cylindrical inner tube 123. The elastic body 124 has four projections. The portions 125 are adjacent to each other at an angle of 90 degrees, and the edges of each protrusion 125 are set in a cylindrical cross shape arranged on the same circumference.

FIG. 9 is a sectional view taken along the line IX-IX of FIG. 3. The upper mounting device 17a (117) according to the second embodiment of the present invention is housed in the upper housing 20 of the engine holder 2. Upper mount cover 1
9 shows a fixed state. As shown in FIG. 9, the shape of the upper housing 20 formed by the engine holder 2 and the upper mount cover 19 is set to be cylindrical along the outer shape of the upper mount device 17a (117).

The cross section of the upper mounting device 17a (117) is arranged in the upper housing 20 in a cross shape. A fitting projection 26 is provided on one side surface of the upper mounting device 17a (117). A plurality of fitting grooves 27 are formed on the inner wall of the upper housing 20 at a predetermined angle.
7 is formed at an angle of 45 degrees, and the upper mounting device 17 is formed.
a (117) By fitting the fitting protrusion 26 into any one of the fitting grooves 27 at the time of insertion, the rotation of the upper mount device 17a (117) is prevented, and the upper mount device 17a (117) is not shown in detail. The device 17a (11
7) can also be arranged such that its cross section is in an X-shaped state. Note that the angle of the two fitting grooves 27 is not limited to 45 degrees, and may be, for example, 30 degrees or 60 degrees.

Incidentally, since the mounting device 17 shown in the first embodiment has a cross-shaped cross section, it is possible to provide an optimum vibration absorption characteristic by changing each dimension of the cross section. As an example of the change in the dimensions, for example, the cross-sectional length of one surface of the elastic body 24 is smaller than the cross-sectional length of the adjacent surface, and the cross-sectional width of the protruding portion 25 located on the short surface side is the protruding portion positioned on the long surface side. 25 may be larger than the cross-sectional width.

As a specific example, as shown in FIG. 10 showing a third embodiment of the present invention, an elastic body 224 is provided.
Is smaller than the cross-sectional height B of the elastic body 224, and the cross-sectional width a of the protrusion 225 positioned in the width direction of the elastic body 224 is set to the protrusion 22 positioned in the height direction of the elastic body 224.
5 (A <B, a> b). In this case, the rigidity in the direction supporting the weight of the engine 4 is increased. In this case, since A ≠ B and a ≠ b, the housing 222 of the mounting device 217 has a rectangular cross-sectional shape.

Next, the operation of the present embodiment will be described.

If the cross-sectional shape of the elastic body 24 constituting the mounting device 17 is formed in a cross shape, the vibration of the engine 4 which has been conventionally absorbed only by the hardness of the elastic body 24 can be absorbed by the cross-sectional shape of the elastic body 24. Therefore, the vibration of the engine 4 can be sufficiently absorbed while the elastic body 24 is hardened to sufficiently receive the load in the thrust direction. Of course, the change in hardness of the elastic body 24 does not hinder the vibration of the engine 4 from being absorbed.

In addition, since it is possible to change the setting of each dimension of the cross-sectional shape, which was impossible in the past, it is possible to increase rigidity in a specific direction and to provide more optimal vibration absorption characteristics.

Furthermore, the mounting device 17 can be easily accommodated by making the cross-sectional shape of the housing in which the mounting device 17 is stored a polygonal shape. In particular, when the cross-sectional shape of the housing is made octagonal, the mounting device 17 becomes two-way. It can be arranged, and can easily cope with vibration characteristics that are changed by using different engines 4. In the case of a housing having a polygonal cross-sectional shape, a space is formed between an inner wall of the housing and a fillet formed between adjacent protrusions 25,
This space serves as a relief portion when the elastic body 24 is deformed.

Further, if the cross-sectional shape of the elastic body 124 is a cylindrical cross shape, the degree of freedom in the location of the mounting device 117 is further increased, and the outboard motor mounted with different engines 4 using the same mounting structural parts. 1 can be used as a common part, and cost can be reduced.

[0031]

As described above, according to the outboard motor mounting structure of the present invention, in an outboard motor mounted on a bracket fixed to a ship via a mounting device, the mounting device is supported. Since the elastic member is arranged around the member and the cross-sectional shape of the elastic member is formed in a cross shape, the vibration of the engine can be sufficiently absorbed while sufficiently receiving the load in the thrust direction.

In the elastic member, four protrusions are adjacent to each other at an angle of 90 degrees, and the cross-sectional length of one surface of the elastic member is smaller than the cross-sectional length of the adjacent surface, and the protrusions located on the shorter surface side. Is made larger than the cross-sectional width of the protrusion located on the long surface side, so that rigidity in a specific direction can be increased and more optimal vibration absorption characteristics can be provided.

Further, since the cross section of the housing for accommodating the mounting device provided with the elastic body having a cross-shaped cross section is polygonal, the mounting of the mounting device is improved.

Further, since the cross section of the housing is rectangular, the mounting device can be easily accommodated.

Since the housing has an octagonal cross section, the mounting device can be arranged in two ways, and different vibration characteristics can be accommodated.

Further, in the outboard motor mounted on a bracket fixed to a ship via a mounting device, the mounting device is configured by disposing an elastic body around a support member. And the housing for accommodating the mounting device is formed in a cylindrical shape, so that the degree of freedom in the location of the mounting device is increased.

[Brief description of the drawings]

FIG. 1 is a left side view of an outboard motor showing one embodiment of a mount structure for an outboard motor according to the present invention.

FIG. 2 is an enlarged vertical sectional view of a central portion of the outboard motor.

FIG. 3 is a view taken in the direction of the arrow III in FIG. 2;

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2;

FIGS. 5A and 5B are a side view and a front view of the mounting device according to the first embodiment of the present invention.

FIG. 6 is a sectional view taken along the line VI-VI in FIG. 4;

FIG. 7 is a diagram showing a second example of the first embodiment of the present invention.

FIGS. 8 (a) and (b) are a side view and a front view of a mounting device according to a second embodiment of the present invention.

FIG. 9 is a sectional view taken along the line IX-IX of FIG. 3;

FIG. 10 is a diagram showing a third embodiment of the present invention.

11 (a) and (b) are a side view and a front view of a conventional general mounting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outboard motor 12 Bracket 13 Clamping part 14 Swivel part 17, 117, 217 Mounting device 17a Upper mounting device 17b Lower mounting device 20 Upper housing 22, 222 Lower housing 23, 123 Inner tube (support member) 24, 124, 224 Elasticity Body 25, 125, 225 Projection 26 Fitting protrusion 27 Fitting groove A Cross-sectional width of elastic body B Cross-sectional height of elastic body a Cross-sectional width of protrusion b Cross-sectional height L Thrust direction length R Formed between protrusions Fillet radius

Claims (6)

[Claims] 1. An outboard motor mounted on a bracket fixed to a ship via a mounting device, wherein the mounting device 17 is configured by disposing an elastic body 24 around a support member 23. The outboard motor mounting structure, characterized in that the cross-sectional shape of the outboard motor is a cross. 2. The elastic body 24 has four protrusions 25 adjacent to each other at an angle of 90 degrees, and the cross-sectional length A of one surface of the elastic body 24 is smaller than the cross-sectional length B of the adjacent surface. The outboard motor mounting structure according to claim 1, wherein a cross-sectional width (a) of the protruding portion (25) located on the side of the long side is larger than a cross-sectional width (b) of the protruding portion (25) positioned on the long side. 3. The mounting structure for an outboard motor according to claim 1, wherein the cross section of the housing for accommodating the mounting device provided with the elastic body having a cross-shaped cross section is polygonal. 4. The mounting structure for an outboard motor according to claim 3, wherein the cross section of the housing 22 is square. 5. The mounting structure for an outboard motor according to claim 3, wherein the cross section of the housing 22 is octagonal. 6. In an outboard motor mounted on a bracket fixed to a ship via a mounting device, the mounting device 117 includes an elastic member 124 around a support member 123.
The cross-sectional shape of the elastic body 124 is a cylindrical cross shape, and the shape of the housing 20 that houses the mounting device 117 is a cylindrical shape.