JP2006182220A - Top cowl of outboard motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize large weight reduction while making a top cowl and a molding into the equivalent strength and rigidity, enable furthermore improvement of suction efficiency and output improvement without hampering heat radiation characteristic of the top cowl, and remarkably improve adhesion quality, reduce the cost, and contribute to the weight reduction due to abolishment of joining components. <P>SOLUTION: The top cowl 71 of the outboard motor 1 has a bottom part 71a having an opening, houses an engine 10 from the opening 71b, and is equipped with a molding 91 having an intake air duct 92 sucking the outside air into an engine room 93. The top cowl 71 and the molding 91 are formed with nonferrous metal material, and the molding 91 is mounted to the top cowl 71 by bonding. The molding 91 and the intake air duct 92 are separately formed, and the molding 91 and the intake air duct 92 are mounted by adhesion. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a top cowling of an outboard motor including a molding having an intake air duct that sucks outside air into an engine room.

  Conventionally, in an outboard motor mounted on a small boat, the engine of the propulsion unit is covered with a top cowl and a bottom cowl.

Some of the top cowls include a molding having an intake air duct that opens at the bottom, accommodates the engine from the opening, and sucks outside air into the engine room (for example, Patent Document 1). Conventional moldings are made of resin. For example, mounting to a resin top cowl is usually bolted using a female screw inserted into the top cowl side.
Japanese Patent No. 3046391 (first to fifth pages, FIGS. 1 to 5)

  By the way, in order to reduce the weight of the top cowl, it has been attempted to mold the top cowl with aluminum. However, if the molding attached to the top cowl is made of a conventional resin, it is a thin and large part. It is difficult to reduce the weight.

  In addition, when the top cowl is formed of aluminum, the heat dissipation of the engine can be improved, but the heat dissipation characteristics are hindered by the resin molding covering a large proportion of the surface of the top cowl.

  Further, for example, when a mounting bolt is abolished to reduce the weight and an adhesive is taken into consideration for bonding, dissimilar materials are bonded, and the type of adhesive for obtaining a necessary adhesive force is limited.

  The present invention has been made in view of the above points, and can achieve a significant weight reduction while maintaining the same strength and rigidity of the top cowling and molding, and without further impairing the heat dissipation characteristics of the top cowling. Providing a top cowling for outboard motors that can improve suction efficiency and output, further improve adhesion quality, reduce costs, and contribute to weight reduction by eliminating fastening parts. It is an object.

  In order to solve the above-described problems and achieve the object, the present invention is configured as follows.

The invention according to claim 1 is a top cowl of an outboard motor including a molding having an intake air duct that opens at the bottom, accommodates the engine from the opening, and sucks outside air into the engine room.
Forming the top cowl and the molding with a non-ferrous metal material;
An outboard motor top cowl, wherein the molding is attached to the top cowl by bonding.

The invention according to claim 2 forms the molding and the intake air duct separately.
The outboard motor top cowl according to claim 1, wherein the molding and the intake air duct are attached by adhesion.

According to a third aspect of the present invention, the molding is formed by a press,
3. The top cowl for an outboard motor according to claim 1, further comprising a convex portion formed by pressing.

In the invention according to claim 4, the left and right side portions and the rear portion of the molding are bonded to the left and right side surfaces and the rear side surface of the top cowl,
4. The outboard motor top cowl according to claim 1, wherein a front portion of the molding is bonded to an inner surface of a ceiling of the top cowl. 5.

  With the above configuration, the present invention has the following effects.

  According to the first aspect of the present invention, the top cowl and the molding are made of a non-ferrous metal material having excellent specific strength and specific rigidity with respect to the resin, so that the weight can be significantly reduced while maintaining the same strength and rigidity. realizable. Further, since the nonferrous metal material has a very high thermal conductivity with respect to the resin, the suction efficiency is further improved and the output is improved without impeding the improvement of the heat dissipation characteristics of the top cowl. In addition, since the top cowl and molding are made of the same non-ferrous metal material, it is possible to greatly improve the adhesive quality of the adhesive and to eliminate the need for primer treatment on the surface of the adherend before bonding. Cost reduction is also expected. In addition, the conventional bolt fixing can also contribute to weight reduction by eliminating the fastening parts.

  According to the second aspect of the present invention, the molding and the intake air duct are formed separately from each other by using a non-ferrous metal material, and the molding and the intake air duct are attached to each other by bonding.

  According to the invention described in claim 3, the molding is formed by pressing and has a convex portion formed by pressing, and the convex portion improves the rigidity of the molding, and as a result, the rigidity of the cowl is improved. be able to. Further, the water on the molding can be smoothly discharged without hindering the flow of water to the outside air intake opening.

  According to the invention described in claim 4, the left and right side portions and the rear portion of the molding are bonded to the left and right side surfaces and the rear side surface of the top cowl, the front portion of the molding is bonded to the ceiling inner surface of the top cowl, and the entire circumference of the molding is formed. By adhering and fixing with an adhesive, the waterproofness of the molding mounting surface can be secured without using another seal member. Moreover, the rigidity of the ceiling surface and the side surface of the top cowl is improved by bonding and fixing with an adhesive all around the molding.

  Hereinafter, although the embodiment of the top cowl of the outboard motor of the present invention will be described, the present invention is not limited to this embodiment. The embodiment of the present invention shows the most preferable mode of the present invention, and the present invention is not limited to this.

  First, the overall configuration of the outboard motor will be outlined with reference to FIG. FIG. 1 is a side view of the outboard motor.

  The outboard motor 1 is attached to the stern plate 3 a of the hull 3 by a clamp bracket 2, and a swivel bracket 6 that elastically supports the propulsion unit 5 by upper and lower mount members 4 a and 4 b is attached to the clamp bracket 2 by a tilt shaft 20. It is pivotally attached to it.

  The propulsion unit 5 has a housing composed of a cowl 7, an upper case 8 and a lower case 9, and a 4-cycle engine 10 is accommodated in the cowl 7. The upper case 8 is attached to the lower part of the exhaust guide 11. The engine 10 is supported by an exhaust guide 11.

  A crankshaft 12 is disposed in the engine 10 in the vertical direction, and the crankshaft 12 is connected to an upper end of a drive shaft 13 that vertically cuts through the upper case 8. The lower end of the drive shaft 13 is connected to a forward / reverse switching mechanism 14 housed in the lower case 9, and a propeller shaft 15 extends in the horizontal direction from the forward / backward switching mechanism 14, and the propeller shaft 15 is outside the lower case 9. A propeller 16 is attached to the rear end protruding to the rear.

  The cowling 7 includes a bottom cowl 70 and a top cowl 71. The top cowl 71 has an outside air intake opening 90, and the air sucked from the outside air intake opening 90 is sucked into the engine room 93 through the intake air duct 92 of the molding 91.

  The top cowl 71 is formed as shown in FIGS. FIG. 2 is a diagram showing a top cowl outside air intake opening section, FIG. 3 is a diagram showing a molding having an intake air duct, and FIG. 4 is a sectional view taken along line IV-IV in FIG.

  The top cowl 71 of this embodiment is formed of a non-ferrous metal material, the bottom 71a is opened, and the engine 10 is accommodated from the opening 71b. The top cowl 71 is formed by die casting, pressing, or the like using a lightweight non-ferrous metal material with good heat dissipation such as aluminum, an aluminum alloy, or magnesium.

  Further, like the top cowl 71, the molding 91 and the intake air duct 92 are formed by die-casting, pressing or the like using a light non-ferrous metal material with good heat dissipation such as aluminum, aluminum alloy or magnesium.

  The molding 91 and the pair of left and right intake air ducts 92 are formed separately. The molding 91 is formed by pressing, and has a left and right side portions 91a and 91b, a rear portion 91c, and a front portion 91d by bending the outer peripheral edge downward.

  The left and right side portions 91a and 91b and the rear portion 91c of the molding 91 are bonded to the left and right side surfaces 71r and 71s and the rear side surface 71t of the top cowl 71, and the front portion 91d of the molding 91 is bonded to the ceiling inner surface 71u of the top cowl 71 with an adhesive. To do. In this way, by adhering and fixing to the top cowl 71 with an adhesive over the entire circumference of the molding 91, the waterproofness of the molding mounting surface can be secured without using another seal member. In addition, by fixing with an adhesive over the entire circumference of the molding 91, the rigidity of the ceiling surface and the side surface of the top cowl 71 is improved.

  The molding 91 is formed by pressing and has a convex portion 91g formed by pressing. The convex portion 91g is formed in a convex shape upward on a wide flat surface portion 91h between the pair of intake air ducts 92. The convex portion 91g improves the rigidity of the molding 91. As a result, the rigidity of the cowl is improved. Can do. Further, the water on the molding 91 can be smoothly discharged without hindering the flow of water to the outside air intake opening 90. By forming the convex-shaped portion 91g above, water is accumulated in the molding 91. Can be prevented.

  Further, the convex portion 91g is formed in the front-rear direction of the outboard motor, and can further increase the intake efficiency and improve the output without increasing the intake resistance. In the left and right rear portions of the molding 91, drain holes 91j are formed.

  As shown in FIG. 2, a water tray 98 is disposed below the drain hole 91j, and water falling from the drain hole 91j accumulates in the water tray 98. A water drain pipe 99 is connected to the water tray 98, and the water drain pipe 99 is held along the inner surface of the water drain pipe 99. The water collected in the water tray 98 is discharged downward from the front side of the top cowl 71 through the water discharge pipe 99.

  The intake air duct 92 has a pair of openings 91f in which left and right divided bodies 92a and 92b are bonded in a cylindrical shape, and mounting portions 92a1 and 92b1 formed by bending the ends of the divided bodies 92a and 92b are formed in the molding 91. Attach by gluing around. In this manner, the molding 91 and the intake air duct 92 are formed separately from each other by using a non-ferrous metal material, and the molding 91 and the intake air duct 92 are attached by bonding, thereby facilitating molding using the non-ferrous metal material.

  A molding 91 having an intake air duct 92 is attached to the top cowl 71 at a position facing the opening 90 for taking in outside air.

  The rear portion 91c of the molding 91 is bonded to the rear side surface 71t along the lower opening edge 90a of the opening 90 for taking in outside air of the top cowl 71. The lower opening edge 90a and the rear portion 91c of the molding 91 have a continuous shape, and the intake resistance can be suppressed by smoothing the flow of intake air.

  As described above, the top cowl 71 and the molding 91 are made of a non-ferrous metal material having excellent specific strength and specific rigidity with respect to the resin, so that significant weight reduction can be realized while maintaining the same strength and rigidity. Further, since the nonferrous metal material has a very high thermal conductivity with respect to the resin, the suction efficiency is further improved and the output is improved without impeding the improvement of the heat dissipation characteristics of the top cowl 71. Further, since the top cowl 71 and the molding 91 are made of the same non-ferrous metal material, the adhesive quality of the adhesive can be greatly improved, and primer treatment on the surface of the adherend before bonding is not necessary. Therefore, cost reduction can be expected. In addition, the conventional bolt fixing can also contribute to weight reduction by eliminating the fastening parts.

  In the present invention, the top cowl and the molding are made of a non-ferrous metal material having excellent specific strength and specific rigidity with respect to the resin, so that significant weight reduction can be realized while maintaining the same strength and rigidity. Further, since the nonferrous metal material has a very high thermal conductivity with respect to the resin, the suction efficiency is further improved and the output is improved without impeding the improvement of the heat dissipation characteristics of the top cowl. In addition, since the top cowl and molding are made of the same non-ferrous metal material, it is possible to greatly improve the adhesive quality of the adhesive and to eliminate the need for primer treatment on the surface of the adherend before bonding. Cost reduction is also expected. In addition, the conventional bolt fixing can also contribute to weight reduction by eliminating the fastening parts.

It is a side view of an outboard motor. It is a figure which fractures | ruptures and shows the opening part for external air intake of a top cowl. It is a figure which shows the molding which has an intake air duct. It is sectional drawing which follows the IV-IV line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outboard motor 10 Engine 71 Top cowl 71a Bottom part 71b Opening part 90 Opening part for taking in outside air 91 Molding 92 Intake air duct 93 Engine room

Claims (4)

A top cowling of an outboard motor having a molding that has an intake air duct that opens at the bottom, accommodates the engine from the opening, and sucks outside air into the engine room,
Forming the top cowl and the molding with a non-ferrous metal material;
A top cowl for an outboard motor, wherein the molding is attached to the top cowl by bonding. Forming the molding and the intake air duct separately;
2. The outboard motor top cowl according to claim 1, wherein the molding and the intake air duct are attached by adhesion. The molding is formed by a press,
The top cowling of the outboard motor according to claim 1, wherein the top cowl has a convex portion formed by pressing. Adhering the left and right sides and the rear of the molding to the left and right sides and the rear side of the top cowl,
The top cowl of an outboard motor according to any one of claims 1 to 3, wherein a front portion of the molding is bonded to an inner surface of a ceiling of the top cowl.

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