JP2008223801A - Fastening structure comprising hose and metal clamp fastening the hose - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastening structure improving corrosion resistance by inhibiting electric erosion of a metal clip fastening a hose and an oil introducing pipe and a delivery pipe as much as possible under an environment where splash of see water or the like scattered even through it is covered by an engine cover such as an oil hose of an outboard engine, and provide a fastening structure comprising a hose and a metal clamp fastening the same capable of materializing such a fastening structure easily at low cost with a simple structure. <P>SOLUTION: In fastening structures comprising hoses 31 and metal clamps 32 fastening the hoses 31, the fastening structure comprises the hose provided with a layer 33 having higher electrical resistance than that of the hose between a fastening section of the hose 31 and the metal clamp 32, and the metal clamp fastening the same. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an improvement in a fastening structure including a hose and a metal clamp for fastening the hose.

Conventionally, a technique is known in which a rubber hose is inserted and connected to the tube tip, and the outer periphery of the hose is clamped and fixed with a metal clamp.
Japanese Patent Laid-Open No. 4-91311

The invention of Patent Document 1 relates to an outboard motor. In FIG. 3 of the publication, an oil passage is provided at the lower end of a valve mechanism chamber surrounded by a cylinder head cover, and a lead-out pipe projects downward from the oil passage. The oil hose is connected to the outlet pipe, the oil hose is connected to an oil introduction pipe communicating with the oil pan, and the lubricating oil in the valve mechanism chamber is introduced to the oil pan.
Such an oil hose, an oil lead-out pipe, and an oil introduction pipe are fastened by a metal clamp.

When the above-described oil hose of the outboard motor is fastened with the metal clamp, electric corrosion is generated in the metal clamp, and the metal clamp is corroded. The reason is that the metal clamp is often galvanized and carbon is contained in the rubber hose, so that electric corrosion is likely to occur. As a result of the electric corrosion, corrosion of the metal clamp proceeds.
Although it is an outboard motor, the surroundings of the engine are covered with an engine cover. However, due to the environment used in the sea and lakes, seawater etc. enter the engine cover of the outboard motor, and seawater etc. enter the metal clamp. As a result, the electric corrosion of the metal clamp is promoted and the corrosion may be further promoted.
The present invention has been made to solve the above problems.

  The present invention is a metal clip that fastens a hose and an oil introduction pipe or a lead-out pipe in an environment in which splashes of seawater or the like are scattered, even though it is covered with an engine cover like an oil hose of an outboard motor The present invention provides a fastening structure that suppresses the occurrence of electrolytic corrosion as much as possible and improves corrosion resistance, and a hose that can be realized simply and inexpensively with a simple configuration, with such a fastening structure. It is an object of the present invention to provide a fastening structure including a metal clamp for fastening a metal.

  The invention according to claim 1 is characterized in that, in a fastening structure comprising a hose and a metal clamp for fastening the hose, a layer having a higher electrical resistance than the hose is provided between the fastening portion of the hose and the metal clamp. And

  The invention according to claim 2 is characterized in that, in claim 1, the hose and the metal clamp for tightening the hose are used in an engine for an outboard motor housed in an engine cover having an opening for taking in outside air. And

  The invention according to claim 3 is characterized in that, in claim 1 or 2, the layer having high electrical resistance is a tape-like high resistance material interposed between a metal clamp and a hose.

  The invention according to claim 4 is characterized in that, in claim 1 or 2, the layer having high electrical resistance is formed of a coating formed on an outer peripheral portion of a hose fastened by a metal clamp.

In the invention according to claim 1, since a layer having a higher electric resistance than the hose is provided between the fastening portion of the hose and the metal clamp, an insulating effect is obtained by the layer having a higher electric resistance. It is difficult for electric corrosion to occur between the metal clamps to be fastened and corrosion of the metal clamps is suppressed.
In addition, since the present invention only provides a layer having a higher electrical resistance than the hose between the fastening portion of the hose and the metal clamp, a layer having a higher electrical resistance is provided on the entire metal clamp, or the material of the hose has a higher electrical resistance. It is possible to obtain a fastening structure including a hose excellent in corrosion resistance and excellent in corrosion resistance and a metal clamp for fastening the same, such as no need to form the material.

  In the invention according to claim 2, in claim 1, since the hose and the metal clamp for tightening the hose are used for an engine for an outboard motor housed in an engine cover having an opening for taking in outside air, In addition to the effect of 1, the seam or the like can be infiltrated and scattered, and as a fastening structure in the hose connection of an outboard motor, a metal clamp excellent in anticorrosion resistance and corrosion resistance can be obtained.

  In the invention according to claim 3, in claim 1 or 2, the high electrical resistance layer is a tape-like high resistance material interposed between the metal clamp and the hose. In addition to the effect of the above, when fastening the hose connection with a metal clamp, a tape material may be interposed between the metal clamp, such as by wrapping a high resistance tape around the outer periphery of the hose connection, High corrosion resistance and corrosion resistance can be obtained with a simple configuration and an inexpensive method.

  In the invention according to claim 4, in claim 1 or 2, the layer having a high electrical resistance is formed of a coating formed on the outer peripheral portion of the hose fastened by the metal clamp, so that the electrical resistance is applied to the outer periphery of the connecting portion of the hose. What is necessary is just to form with a high coating material, a resin coating, etc., and high corrosion resistance and corrosion resistance can be obtained with a simple and simple structure and an inexpensive method.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is an overall side view in which a part of an engine cover and an under cover constituting the exterior of an outboard motor are broken so that the main part of the engine can be visually recognized, and FIG. 2 is a longitudinal side view of the engine part. It is a longitudinal cross-sectional view of the outboard motor upper part including.
The outline of the outboard motor will be described with reference to FIGS.

The outboard motor 1 includes an engine cover 2 that covers the engine 8, an under cover 3 that covers the lower part of the engine 8, an extension case 4 that extends below, and a lowermost gear case 5. The stern is mounted and supported so as to be tiltable and steerable by the swivel case 7.
The engine cover accommodates a vertical engine with a crankshaft 14 oriented vertically, in the embodiment, an engine 8 having a plurality of cylinders (three cylinders in the figure). The crankcase 10 and the cylinder head 11 at the rear portion where the cylinder head cover 12 is covered.
The engine cover 2 includes a cylindrical portion 2b having an opening 2a in the upper portion thereof, and constitutes an outside air inlet 2c.

In the cylinder block 9, pistons 13 are slidably fitted in the cylinders 9 a... (... represents a plurality, the same applies hereinafter) with the axis extending sideways, and are vertically inserted through the connecting rods 13 a. It is connected to the crankshaft 14 arranged in the direction.
A camshaft 15 is mounted and supported vertically on the cylinder head 11 via a camshaft holder 15a, and a valve mechanism is slidably contacted with the cam portion of the camshaft 15 to move the valve in the cylinder head cover 12. The mechanism chamber 16 is assumed.

The lower part of the engine 8 is supported by a mount case or an undercase 17 as a support case. A drive shaft 19 is suspended vertically at the output end of the crankshaft 14 via a gear mechanism 18. The propeller 20 protruding rearward is driven to obtain propulsive force. That is, the upper surface of the undercase and the inner surface of the undercover 3 constitute the lower part of the engine room.
An oil pan 21 is coupled and supported below the engine, 21a is an oil return pipe, 22 in FIG. 2 is a flywheel started by a starter 23, and 24 is a crankshaft 14 and a belt pulley mechanism. A driven pulley for driving a camshaft.
In FIG. 1, 25 is a combustion supply device such as a carburetor, 26 is an intake manifold, and 27 is a fuel pump.

In the above, the lowermost part of the cylinder head cover 12 constituting the valve mechanism chamber 16 is provided with a lead-out port 28 for lubricating oil for lubricating the valve mechanism, and the lead-out port 28 is a suspended connecting pipe part 30. Have
On the other hand, the upper wall portion of the oil pan 21 is provided with an introduction pipe portion 29 that constitutes an oil introduction port, and the outlet port 28 and the introduction tube portion 29 are connected by a rubber hose 31, and the valve operating mechanism chamber. The oil after lubrication in 16 is returned to the oil pan 21.

FIG. 3 is an enlarged vertical cross-sectional view of the main part of the fastening structure according to the first embodiment of the present invention, and FIG. 4 is a perspective view of the fastening part.
Reference numeral 30 denotes a lead-out pipe constituting an oil lead-out part. An end part 30a fitted to the end part 31a of the rubber hose (rubber tube) 31 is provided with a tapered enlarged diameter part 30b, and the end part of the rubber hose 31 is connected to the lead-out pipe 30. Lightly press-fit from the outer periphery of the end portion 30a, and fit the hose end portion to the outlet tube end portion.

After that, the metal clamp 32 is surrounded by the outer periphery of the end portion of the rubber hose 31 that faces the outer periphery of the outlet tube 30, and the end portions 31 a and 30 a that are elastically overlapped inside and outside are fastened.
In the above, the tape material 33 having a high electrical resistance (high resistance) is interposed between the inner periphery 32 a of the metal clamp 32 and the outer periphery 31 b of the end portion 31 a of the rubber hose 31.
The tape material 33 is wound around the outer periphery of the end portion of the rubber hose 31, and the width is set to be sufficiently larger than the width of the metal clamp 32.

By the way, although it is high resistance mentioned above, high resistance means that a volume specific resistance value is high, and 107 ohm-cm or 109 ohm-cm or more is considered as high resistance.
The volume resistivity value is measured based on standards such as HES3219-00 or JIS K7194, JIS K6911.

By winding the tape 33 made of the above high resistance material so as to hold the circumference of the end portion of the rubber hose 31 when the metal clamp 32 is sandwiched, the metal clamp 32 and the rubber hose 31 are insulated from each other. It becomes.
The metal clamp 32 can prevent rust by applying a zinc-aluminum composite coating. The metal clamp 32 can improve mechanical properties by adding a zinc component to the base material. As a result, the occurrence of electrolytic corrosion between the metal clamp 32 containing the zinc component or containing the zinc component and the rubber hose 31 containing a small amount of carbon is suppressed, and the corrosion of the metal clamp 32 is suppressed. .

In the above case, the tape made of a high resistance material is wrapped around the end of the rubber hose fitted around the outer periphery of the outlet pipe, surrounded by a metal clamp, clamped, and fastened. On the other hand, it can be manufactured at a relatively low cost.
In addition, since a tape made of a high resistance material is wound, there is an advantage that it can be repaired by rewinding it and maintenance is high for maintaining performance.
Instead of the high resistance tape material, a silicon rubber sheet which is a high resistance material may be interposed between the metal clamp and the rubber hose.

FIG. 5 is a sectional view similar to FIG. 3, showing a second embodiment of the present invention.
In the present embodiment, since the metal clamp, the rubber hose, and the outlet pipe 30 are the same, the same portions are denoted by the same reference numerals, and detailed description thereof is omitted.
In the present embodiment, the coating layer 34 is formed on the outer periphery of the end portion 31a of the rubber hose 31 using a coating made of a high resistance material, and tightened so as to surround the metal clamp 32 from the outer periphery of the coating layer 34. A coating layer 34 made of a material is interposed between the metal clamp 32 and the rubber hose.

Also in the above, the coating film 34 made of a high resistance material as described above covers the periphery of the end portion of the rubber hose 31 when the metal clamp 32 is sandwiched, and the high resistance is provided between the metal clamp 32 and the rubber hose 31. It is insulated by the coating film 34 made of a material.
It should be noted that the same action and effect can be obtained even when the electrical resistance value is increased by coating an epoxy resin, a silicon resin or the like as the coating of the high resistance material.

  The fastening structure comprising the hose according to the present invention and the metal clamp for fastening the hose is suitable as a metal clamp for the hose, in which the oil passage of the outboard motor is constituted by a hose.

FIG. 2 is an overall side view in which a part of an engine cover and an under cover that constitute the exterior of the outboard motor are broken so that the main part of the engine can be visually recognized. It is a longitudinal cross-sectional view of the outboard motor upper part including the vertical side view of an engine part. It is a principal part expanded longitudinal cross-sectional view of the fastening structure which concerns on 1st Example of this invention. It is a perspective view of a fastening part. It is sectional drawing similar to FIG. 3 which shows 2nd Example of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Outboard motor, 2 ... Engine cover, 8 ... Engine, 31 ... Hose, 32 ... Metal clamp, 33 ... Tape-like high resistance material, 34 ... Film.

Claims (4)

In the fastening structure consisting of a hose and a metal clamp that tightens this hose,
Between the fastening portion of the hose and the metal clamp, a layer having a higher electrical resistance than the hose was provided.
The fastening structure which consists of the hose characterized by this and the metal clamp which clamps this. The hose and the hose according to claim 1, wherein the hose and the metal clamp for fastening the hose are used in an engine for an outboard motor housed in an engine cover having an opening for taking in outside air. Fastening structure consisting of metal clamps to be tightened. The high electrical resistance layer is a tape-like high resistance material interposed between a metal clamp and a hose, and comprises the hose according to claim 1 or 2, and a metal clamp for fastening the hose. tightening structure. 3. The fastening structure comprising a hose and a metal clamp for fastening the hose according to claim 1, wherein the high electrical resistance layer is formed of a coating formed on an outer peripheral portion of a hose fastened by a metal clamp. .

Images