JPH0694280B2 - Outboard motor - Google Patents

Description

The present invention relates to an outboard motor, and more particularly to an installation mode of a vibration proof mount.

[Prior art]

The outboard motor is usually provided with some vibration isolating means to prevent the vibration of the engine from being transmitted to the hull. As one of such vibration damping means, there is an inner and outer cylindrical vibration damping mount shown in FIG. In this vibration-proof mount A, an outer cylinder B serving as one holder is fitted with an inner cylinder C serving as the other holder, and a rubber D serving as a cushioning material is provided in a gap between the outer cylinder B and the inner cylinder C. Is installed. That is, the rubber D is sandwiched between the outer cylinder inner peripheral surface B ′ and the inner cylinder outer peripheral surface C ′ that face each other. Further, in the vibration isolation mount A, the radial direction of the outer cylinder B and the inner cylinder C is the action direction for vibration isolation. That is, the relative displacement in the direction in which the outer cylinder B and the inner cylinder C as the holders facing each other approach each other is absorbed. Further, in the above-described vibration-proof mount A, the outer cylinder B and the inner cylinder C can be relatively displaced in the direction along the central axis, that is, in the thrust direction. The outer cylinder B of the anti-vibration mount A is attached to, for example, the outboard motor body, while the inner cylinder C is attached to the swivel bracket, and the outboard motor body and the swivel bracket are connected to each other. The vibration D is absorbed by the rubber D of the antivibration mount A and the transmission of the vibration to the hull is reduced. Further, the vibration-proof mount A is generally arranged so that its axis (reference numeral EE in the drawing), that is, the thrust axis extending orthogonally to the above-described action direction, is parallel to the outboard motor and the hull of the hull. Then, it is interposed between the outboard motor body and the swivel bracket.

By the way, it is preferable to set the rubber D of the antivibration mount A to be soft for antivibration. However, there is an inconvenience that the alignment between the outboard motor body and the swivel bracket becomes unstable and the steering stability deteriorates.
Further, when the rubber D is soft, when the propulsive force of the outboard motor body becomes large like during high-speed navigation, the outer cylinder B and the inner cylinder C are largely displaced relative to each other, and the outboard motor body and the swivel bracket are separated from each other. At the end, there is a possibility that the function of vibration proof will be significantly impaired. Therefore, if the rubber D is set to be hard, it is possible to prevent lowering of steering stability and contact between the outboard motor main body and the swivel bracket during high-speed navigation, but it is difficult to absorb engine vibrations, and thus the ride comfort is improved. It becomes a bad ship.

[Object of the Invention]

The present invention has been made in view of the above circumstances, and an object thereof is to provide an outboard motor that is excellent in vibration damping properties and, at the same time, can improve steering stability of a ship.

[Structure of Invention]

Therefore, in the present invention, a vibration-damping mount formed by interposing a cushioning material between the outer cylinder and the inner cylinder is such that the axis of the vibration-damping mount is aligned with one point on the front-rear center line of the outboard motor body and the front-rear center is formed. The two cylinders are tilted to the right and left with respect to each other at equal angles, and are arranged at symmetrical positions with the front-rear center line of the outboard motor body in plan view, and the outer cylinder of the vibration isolation mount is attached to the swivel bracket and the outboard motor. The above object is achieved by being fixed to one of the main bodies, and the inner cylinder of the vibration isolation mount being fixed to the other of the swivel bracket and the outboard motor main body.

〔Example〕

Hereinafter, a specific configuration of the present invention will be described in detail with reference to the drawings showing an embodiment.

1 to 4 show an outboard motor according to the present invention. As shown in FIG. 3, the outboard motor 1 includes a clamp bracket 2 and a swivel bracket 3 swingably attached to the clamp bracket 2, and the outboard motor main body 4 is attached to the swivel bracket 3. It is supported. The swivel bracket 3 has a bracket main body 3a that is swingably supported around a horizontal axis with respect to the clamp bracket 2, and a support shaft (not shown) that extends vertically through the bracket main body 3a. Further, a steering bracket 5 is fixedly mounted on the upper portion of the support shaft, and a mount bracket 6 is fixedly mounted on a lower portion of the support shaft. Further, between the steering bracket 5 and the outboard motor body 4, and the mount bracket 6
A pair of left and right anti-vibration mounts 10 are respectively interposed between the outboard motor body 4 and the outboard motor body 4, and thus the outboard motor body 4 is
It is mounted on the swivel bracket 3 via the vibration-damping mounts 10, 10 ... And is swingably supported about a support shaft (not shown) of the swivel bracket 3. As shown in FIG. 3, the vibration isolation mounts 10 are arranged along the axis of the outboard motor 1 and the hull (not shown) in the direction of the tail line, that is, in the left-right direction in the figure. . Further, as shown in FIG. 1, the pair of anti-vibration mounts 10, 10 interposed between the outboard motor body 4 and the steering bracket 5 are arranged in the front-rear direction of the outboard motor body 4 (left-right direction in the figure). Are provided so as to sandwich a front-rear center line O-O extending along the
o and 10o are respectively aligned with the point P on the front-rear centerline O-O, and are arranged in the left-right direction with respect to the front-rear center-line O-O by mutually equal center angles α. The anti-vibration mounts 10 and 10 are occupying positions symmetrical to each other with the front-rear center line OO interposed therebetween in a plan view of the outboard motor body 4. The vibration-proof mount 10 has an outer cylinder 11 and an inner cylinder 12 that is loosely fitted in the outer cylinder 11, and a rubber 13 as a cushioning material is interposed between the outer cylinder 11 and the inner cylinder 12. The outer cylinder 11 is fitted and fixed to the outboard motor body 4, and the inner cylinder 12 is fixed to the steering bracket 5 via bolts 20. On the other hand, a pair of anti-vibration mounts 1 interposed between the outboard motor body 4 and the mount bracket 6
As shown in FIG. 2, 0 and 10 are also provided so as to sandwich a front-rear center line OO extending along the front-rear direction (the left-right direction in the drawing) of the outboard motor main body 4 and own axis lines 10o, 10o. Are aligned with a point P on the front-rear center line OO and are inclined in the left-right direction with respect to the front-rear center line OO at the same central angle α, and the outboard motor main body 4 is provided. In the plan view of FIG. 1, the positions are symmetric with respect to each other with the front-rear center line OO interposed therebetween. The outer cylinder 11 of the vibration isolation mount 10 is fixed to the outboard motor body 1, and the inner cylinder 12 is fixed to the mount bracket 6 via bolts 20.

Now, when traveling at a low speed, a large vibration generated due to uneven rotation of the engine is absorbed by the rubber 13 of the antivibration mount 10. Thus, a good ride comfort is ensured during low speed navigation. Further, when the speed is increased from the low speed navigation state, the thrust of the outboard motor body 4 increases and the arrow F in FIG.
As shown by, the outboard motor body 4 is pressed against the swivel bracket 3 side. As a result, the outer cylinder 11 fixedly mounted on the outboard motor body 4 moves substantially along the front-rear centerline OO, as indicated by the arrow F'in FIG. Fig. 4 shows
FIG. 1 shows an anti-vibration mount 10 drawn on the upper left side of FIG. 1, and the right side of the figure is the traveling direction of the ship. When the outer cylinder 11 moves, the lower half peripheral portion 13a of the rubber 13 in FIG.
The inner peripheral surface 11a of 1 and the outer peripheral surface 12a of the inner cylinder 12 compress and harden. In such a high-speed navigation state, the rubber 13 becomes hard, so that the alignment between the outboard motor body 4 and the swivel bracket 3 becomes stable and reliable, so that the fluctuation of the outboard motor body 4 is suppressed and the steering stability is stabilized. The property is improved. Further, since the rubber 13 becomes harder as the navigation speed increases, the alignment becomes reliable. It should be noted that, at the time of high-speed navigation, since the wave shock received on the bottom of the ship is large, the rubber 13 becomes hard and the absorption of the engine vibration is slightly deteriorated, but this does not cause a particularly serious problem in ride comfort. In addition, each of the anti-vibration mounts 10 shown in FIGS.
However, it goes without saying that the same behavior as described above is exhibited. In this way, even if the rubber 13 is set to be soft so that the vibration of the engine is effectively absorbed during low speed navigation, the hardness of the rubber 13 increases during high speed navigation, so good steering stability is obtained. Sex is obtained.

In the present embodiment, each anti-vibration mount 10 is tilted so as to approach the front-rear centerline OO as it goes forward, but conversely, as it goes forward, it tilts so as to move away from the front-rear centerline OO. Alternatively, the tilt direction of the anti-vibration mount attached to the steering bracket 5 and the tilt direction of the anti-vibration mount attached to the mount bracket 6 may be arranged opposite to each other. Further, the vibration-proof mount may have its axial axis in the thrust direction inclined with respect to the front-rear center line O-O. It can be set appropriately within the range.

〔The invention's effect〕

As described above in detail, in the outboard motor according to the present invention, the anti-vibration mount formed by interposing the cushioning material between the outer cylinder and the inner cylinder is used. Matched with a point on the front-rear centerline and inclined at equal angles to the front-rear centerline with respect to the left and right, and arranged at symmetrical positions on both sides of the front-rear centerline of the outboard motor body in plan view,
The outer cylinder of the anti-vibration mount is fixed to one of the swivel bracket and the outboard motor main body, and the inner cylinder of the anti-vibration mount is fixed to the other one of the swivel bracket and the outboard motor main body. While the vibration is effectively absorbed, during high-speed navigation, the outer cylinder and the inner cylinder of the anti-vibration mount are relatively displaced along the front-rear center line of the outboard motor body, whereby the outer cylinder and the inner cylinder are displaced. A part of the cushioning material sandwiched between and is compressed to increase hardness. Thus, it is possible to obtain an outboard motor that has excellent vibration damping properties and, at the same time, can also achieve improved steering stability.

[Brief description of drawings]

1 is a sectional view taken along line I-I in FIG. 3, FIG. 2 is a sectional view taken along line II-II in FIG. 3, and FIG. 3 is a side view of an outboard motor according to the present invention. 4 is a sectional view showing the structure and operation of the vibration proof mount, and FIG. 5 is a sectional view of the vibration proof mount. 1 ... Outboard motor, 3 ... Swivel bracket, 4 ... Outboard motor body, 5 ... Steering bracket, 6 ... Mount bracket, 10 ... Vibration mount, 11 ... Outer cylinder, 12 ...
… Inner cylinder, 13 …… rubber.

Claims (1)

[Claims] 1. A clamp bracket fixedly installed at a rear portion of a hull, a swivel bracket having a vertically extending spindle and supported by the clamp bracket, and swinging around the swivel bracket around the spindle. An outboard motor comprising a freely mounted outboard motor main body and a pair of left and right anti-vibration mounts provided between the swivel bracket and the outboard motor main body, wherein the anti-vibration mount comprises: An outer cylinder and an inner cylinder loosely fitted to the outer cylinder, and a cushioning material interposed between the outer cylinder and the inner cylinder, the outer cylinder including the swivel bracket and the outboard motor. The inner cylinder is fixed to one of the main bodies, the inner cylinder is fixed to the other of the swivel bracket and the outboard motor main body, and the axis of the vibration isolation mount extends in the front-rear direction of the outboard motor main body. The front and rear centerlines are aligned with each other, and the axes are inclined to the left and right with respect to the front and rear centerlines by the same angle, thereby sandwiching the front and rear centerlines in a plan view of the outboard motor body. The outboard motor is characterized by arranging the right and left at target positions.