JPH0510196U - Outboard motor - Google Patents

Abstract

(57) [Summary] [Purpose] Prevention of electrochemical corrosion of outboard motors. [Structure] An outboard motor body 13 has a case 8 mounted on a lower end thereof, and a drive shaft 16 protruding from the case 8. The drive shaft 16 has a plurality of blades 6 on the protruding portion. In an outboard motor equipped with a propeller hub 7 provided with, an insulating member is coated on at least one of the edge portions where the case 8 and the propeller hub 7 are close to each other. [Effect] Corrosion of the outboard motor is prevented, and the gloss of the propeller hub and the like can be maintained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention relates to an outboard motor, and in particular, it is mounted on the rear part of a hull of a small boat or the like to be propelled for the boat. The present invention relates to an outboard motor used as a means.

[0002]

[Prior art]

  The outboard motor is used as a propulsion means for small vessels (boats, etc.) mounted on the rear part of the hull. Widely used in general. 4 to 8 show conventional outboard motors. this The outboard motor of the conventional example shown in FIG. 5 has an outboard motor body 13 and a fulcrum shaft for supporting the outboard motor body 13. And a main body support member 10 that rotatably and rotatably supports the main body support member 10a. this The main body supporting portion 10 is fixed to the rear portion of the hull. And the outboard motor During use, the support member 10 is manually rotated to move the outboard motor body 13 It descends so that it is almost perpendicular to the sea surface 11, and the propeller hub 7 part is below the sea surface. To set. Then, the propeller hub 7 is connected to the drive unit ( It is driven to rotate by (not shown), and propulsive force is applied to the hull 9. It

[0003]   In FIG. 5, the outboard motor includes an engine unit 27 housed in an upper cover 20. Cooling is required for the mechanical parts including. Therefore, the outboard motor A plurality of water channels for cooling are provided inside the main body 13. Cooling these Figure 6 shows the structure of the irrigation canal. In FIG. 6, the cooling water 28 is the main cooling water intake port. 19 and auxiliary cooling water intake 21 from the crankshaft (not shown) It is sent into the engine section 27 by the water pump 22 that operates in the same manner. That The cooling water 28 sent into the engine 27 constitutes the engine 27. It is distributed to the cylinder 24, the cylinder head 25, the exhaust cover 26, etc. After cooling each part, pass through the exhaust tube 23 and the case 8, and The exhaust gas is discharged from the rear end of the Rahab 7. In addition, some cooling water 28 It is discharged from the outlet 29.

[0004]   FIG. 7 shows a detailed sectional view of the case 8 portion in FIG. Inside the case 8 A cooling water passage 14 is formed as a cooling water passage on the discharge side. This cooling water The passage 14 drives the cooling water and the exhaust gas sent from the engine portion on the upstream side into a drive shuffle. From the gap 14a between the terminal end of the housing 18 and the case 8. It is discharged in the external C direction through the inner space 7b. Also the propeller Between the hub 7 and the adjacent case 8, there is a clearance for rotation escape of the propeller hub 7. 15 is provided to prevent the propeller hub 7 from contacting the case 8. It can be rotated without any problem.

[0005]   FIG. 8 shows a sectional view of the case in FIG. 5 when the case is tilted up. At the time of mooring the boat, the outboard motor body 13 is rotated by rotating a support member (not shown). By holding the outboard motor lower part above the sea surface 11 by tilting up Made of For this reason, the cooling water that has entered the cooling water passage 14 in the case 8 is It is discharged to the outside through a gap 15a between the case 8 and the propeller hub 7.

[0006]

[Problems to be solved by the device]

  However, in the outboard motor in the above-mentioned conventional example, in FIG. Since the outboard motor body is held at an angle when the The positional relationship between 15a and the lower portion 14a of the cooling water passage is displaced, and the gap portion 15a is directed upward. . For this reason, the cooling water contained in the cooling water passage 14 in the case does not enter the gap 15a. It was not discharged to the position and below and remained as pooled water 3.

[0007]   FIG. 9 shows details of the portion A in FIG. Therefore, with the aluminum case 8. The propeller hub 7 made of stainless steel is used when the outboard motor is not used as well as when it is used. Is continuously electrically conducted by the accumulated water 3 accumulated in the cooling water passage 14 in the case. It was supposed to form a circuit that passed through.

[0008]   Metals have different unipolar potentials (hereinafter referred to as potentials) depending on their types. have. Then, different kinds of metals with different potentials serve as electrodes for each other. When a circuit that conducts through a solvent (such as seawater) that has an electrolyte is formed, The electrode with a base potential acts as an anode and emits electrons into the solvent. on the other hand, The electrode with a more noble potential acts as the cathode and receives electrons. These natural progressions Electrolytic corrosion of metals (hereinafter referred to as "electrolytic corrosion") is generally caused by the row. Are known.

[0009]   From the above, in FIG. 9, the seawater accumulated in the cavity 14 in the case is The base metal aluminum case 8 electrically conducted by the accumulated water 3 For the anode, the precious metal stainless steel propeller hub 7 acts as the cathode. Become. As a result, a local battery is formed, and damaged aluminum such as an anticorrosion film is formed. Corrosion of the aluminum case 8 and stainless steel glossy surface Not only the gloss of the propeller hub 7 and blades (not shown) that have been marked is lost, but also durable. There was an inconvenience that it was bad.

[0010]

[The purpose of the device]

  The object of the present invention is to improve the disadvantages of the conventional example, and in particular It is an object of the present invention to provide an outboard motor in which electric corrosion of an outer motor member is prevented.

[0011]

[Means for Solving the Problems]

  According to the present invention, the case portion mounted on the lower end of the outboard motor main body and the case And a drive shaft projecting from the space, and a plurality of projecting parts of the drive shaft are provided. In the outboard motor equipped with a propeller hub with blades, At least one of the edges that are close to each other with the lopera hub is covered with an insulating member. Etc. are adopted. With these, we try to achieve the above-mentioned purpose. is there.

[0012]

[Action]

  Insulate at least one of the edges where the case and propeller hub face each other. By covering the members, the case and plow made of pooled water such as seawater The formation of an electrical conduction circuit with the lopera hub is prevented, and the occurrence of electrolytic corrosion is suppressed.

[0013]

【Example】

  An embodiment of the present invention will be described below with reference to FIGS. In Figure 5, the ship The outer unit mainly includes the engine unit 27 housed in the upper cover 20 as a drive unit. It needs to be cooled. Therefore, the cooling water taken in from the main cooling water intake 19 After being circulated in the cooling water channel inside the main body, it is discharged to the outside. This 2 is a sectional view of the case portion 8 of the outboard motor main body 13 of FIG. In Figure 2, The case 8 from the engine (not shown) on the upper part of the base to the propeller hub 7. A cooling water passage 14 is formed inside as a cooling water passage on the discharge side. And , The cooling water passage 14 passes around the shaft storage portion 18, and is connected to the drive shaft storage portion. From the gap 14a between the end of 18 and the case 8 to the propeller hub inner space 7 It comes out to the outside C direction through b. Also, close to the propeller hub 7. A gap 15 for rotation escape of the propeller hub 7 is provided between the contacting case 8 and the case 8. Therefore, the propeller hub 7 rotates without contacting the case 8. You can do it.

[0014]   In FIG. 2, the gear case 8 and the rotation escape clearance 15 described above are used for proximity. At the edge of the propeller hub 7, the insulating member 1 made of resin or the like is provided around the edge. Have been dressed. Therefore, an insulating film is formed on the edge of the propeller hub 7. There is. Further, in FIG. 1, a predetermined case of the lower part of the case 8 is attached to the case 8. A drain hole 2 communicating with the cooling water passage 14 is provided at the position.

[0015]   FIG. 3 shows a cross-sectional view when tilting up in FIG. As mentioned above, When pooled water 3 is generated in the cooling water passage 14 of the case 8, the edge portion 7a of the propeller hub 7 When the insulating member 1 is applied to the casing, the case 8 and the propeller hub 7 are collected by the accumulated water 3. Contact. The details of the part B in this state are shown in FIG. Therefore, it is close to GACASE 8. At the edge portion 7a of the propeller hub 7 in contact with the insulating member 1 made of resin or the like, By covering the circumference, this propeller hub 7 was effectively insulated from the accumulated water 3. It has become a thing. Therefore, the propeller hub 7 and the case 8 due to the accumulated water 3 The formation of an electrical conduction circuit is prevented.

[0016]   Further, in FIG. 3, a predetermined position of the lower part of the case 8 which is the deepest part of the accumulated water 3 Since the drain hole 2 for draining the accumulated water is provided in the The cooling water entering the passage 14 is simultaneously discharged to the outside from the gap 15 and the drain hole 2. . After the accumulated water 3 becomes below the level of the gap 15a, the drain hole 2 Drainage is performed. Therefore, since the accumulated water 3 is removed without remaining, This also prevents the formation of an electrical conduction circuit between the case 8 and the propeller hub 7. It is supposed to be.

[0017]   Here, in this embodiment, an insulating member made of resin or the like is provided around the edge of the propeller hub. The coated material has been described, but the material is not limited to this. A passive film such as an oxide may be formed directly on the metal material.

[0018]

[Effect of device]

  As described above, according to the present invention, the case that is installed at the lower end of the outboard motor body And a drive shaft projecting from the case, the drive shaft In an outboard motor that is equipped with a propeller hub equipped with a plurality of blades on the protruding portion of the At least one of the edge portions where the case and the propeller hub are close to each other On the other hand, since the insulation member is covered, the cooling water in the case is Due to the accumulated water remaining in the path, the electrical connection circuit between the case and the propeller hub Formation will be prevented. Therefore, the accumulated water inside the outboard motor may cause Electrolytic corrosion is prevented. Therefore, the aluminum case is protected against corrosion and Durable and practical to maintain the gloss of propeller hubs made of steel Outboard motor can be provided.

[Brief description of drawings]

FIG. 1 is a partial view of an outboard motor body showing an embodiment of the present invention.

FIG. 2 is a sectional view in FIG.

FIG. 3 is an explanatory view when tilting up in FIG.

FIG. 4 is a detailed view of part B in FIG.

FIG. 5 is a front view of a conventional outboard motor body.

6 is an explanatory view of an outboard motor main body in FIG.

FIG. 7 is a partial cross-sectional view in FIG.

8 is an explanatory diagram when tilting up in FIG. 7. FIG.

9 is a detailed view of a portion A in FIG.

[Explanation of symbols]

1 Resin member as an insulating member 2 drain hole 6 feathers 7 Propeller hub 8 GACASE 13 Outboard motor body 16 shafts

Claims (2)

[Scope of utility model registration request] 1. A propeller having a case portion mounted on a lower end portion of an outboard motor body and a drive shaft projecting from the case portion, and a plurality of blades provided on the projecting portion of the drive shaft. An outboard motor equipped with a hub, characterized in that at least one of the edge portions where the casing and the propeller hub are close to each other is covered with an insulating member. 2. A propeller having a case portion mounted on a lower end portion of an outboard motor body and a drive shaft projecting from the case portion, and a plurality of blades provided on the projecting portion of the drive shaft. In an outboard motor equipped with a hub, at least one of edge portions where the case case portion and the propeller hub are close to each other is covered with an insulating member, and 1 or 2 is provided at a predetermined position on the bottom portion of the case case portion. An outboard motor having the above drainage holes for draining water.