JPH1111390A - Anode setting structure for outboard motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately perform temperature control of cooling water, and also facilitate inspection work. SOLUTION: An opening part 105 is formed, which makes cooling water pass through a water jacket in a cylinder body of an engine. On this opening part 105, a single mounting member 5 provided with a drainage port is mounted in an attachable/detachable manner; on this mounting member, a thermostat 6 having an opening/closing valve and an anticorrosion anode 8 are mounted so as to respectively appear in the water jacket 10. The thermostat 6 is constituted such that when it leads to a preset temperature, the valve is opened, cooling water in the water jacket 10 is allowed to flow in the drainage port. The opening part 105 is formed in one side part of the water jacket 10 and in the vicinity of the highest position of the water jacket 10 in the cylinder body 1, and the thermostat 6 is mounted on the mounting member 5 in almost the horizontal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, a thermostat for controlling the temperature of cooling water is installed at an appropriate position in a water jacket for cooling an engine of an outboard motor, and electrochemical protection is provided for preventing corrosion in the water jacket. Installation of an anticorrosion anode (sacrificial anode material) has been performed. Then, the thermostat and the anticorrosion anode are appropriately arranged in a portion having a sufficient space according to the structure of the engine or the arrangement of the auxiliary equipment.

[0003]

The above-mentioned thermostat operates when the temperature of the cooling water around the thermostat reaches a predetermined appropriate value to open a valve to start circulation of the cooling water. It is unavoidable that the temperature of the cooling water in the inside varies depending on the position. For this reason, even when the thermostat operates normally, if the thermostat is placed in a low-temperature portion such as near the inlet of cooling water in a water jacket, the temperature of the cooling water is higher than an appropriate value in a portion having a temperature higher than the temperature at this installation position. Therefore, corrosion of the inner surface of the water jacket at that portion tends to occur. Further, since the thermostat and the anticorrosion anode are separately installed, there is also a problem that it takes time to attach and remove each of the inspections.

The present invention has been made to solve such a conventional problem, and an outboard motor capable of accurately controlling the temperature of cooling water and easily performing inspection work. Is provided.

[0005]

According to a first aspect of the present invention, a water jacket of an engine cylinder body is provided with an opening for allowing cooling water to pass therethrough, and a single mounting provided with a drain port for the opening. The member is attached detachably,
A thermostat having an on-off valve and an anode for electrochemical protection are mounted on the mounting member so as to face the water jacket, respectively, and a drainage channel is connected to the drain port of the mounting member, and the thermostat is set at a set temperature. , The valve is opened to allow the cooling water in the water jacket to flow to the drain port.

According to the first aspect of the present invention, since the mounting member is common for the thermostat and the anode,
The attachment and detachment for inspection and replacement can be performed simultaneously by a single attachment member, so that the operation can be performed easily. Further, by using a common mounting member, there is an advantage that the structure is simplified and the space is saved. When the performance of the thermostat deteriorates due to deterioration over time, the set temperature usually rises.However, when the water temperature rises, corrosion tends to occur. Since the anticorrosion anode is installed near the thermostat, the anticorrosion effect is effectively achieved. Furthermore, the number of mounting bolts of the mounting member to which the anode is mounted is also increased because the mounting bolts are shared with the thermostat mounting member, thereby improving conduction with the cylinder body and improving the anticorrosion effect. Achieved. Therefore, even if the performance of the thermostat deteriorates due to long-term use and the operating temperature rises, the temperature of the cooling water rises and corrosion tends to occur. can do.

According to a second aspect of the present invention, the opening is formed near the highest position of the water jacket of the cylinder body.

According to the second aspect of the present invention, since the thermostat is disposed near the highest position of the water jacket, the internal air flows through the thermostat valve in response to the supply of cooling water into the water jacket. As a result, the cooling water is smoothly filled without air remaining in the water jacket.

Further, when the engine is stopped, it is necessary to immediately drain the water, and when the cooling water is drained, air enters through a thermostat valve installed at a high position, thereby draining the water. Will be promoted. Particularly in the case of an OHV engine, there is no camshaft timing belt on the side of the engine, and a space can be provided, which is preferable for downsizing the outboard motor.

According to a third aspect of the present invention, the opening is formed on one side of the water jacket, and the thermostat is mounted on the mounting member in a substantially horizontal direction.

According to the third aspect of the present invention, since the thermostat is installed in a horizontal posture, there is an advantage that foreign matter in the cooling water is less likely to be caught between the valve seat and the valve element.

According to a fourth aspect of the present invention, the engine is an OHV.
Type.

According to the fourth aspect of the present invention, there is no camshaft timing belt on the side of the engine, so that a space can be provided, which is preferable for downsizing the outboard motor.

[0014]

FIG. 1 is a sectional view taken along the line AA of FIG. 3, FIG. 2 is a side view of the upper structure of the outboard motor 100, and FIG.
FIG. 4 is a plan view of FIG. 3, and FIG. 5 is a side view of a state in which the outboard motor 100 is attached to the hull. The tilted-up state is shown by a solid line, and the normal operation state is shown. This is indicated by a virtual line.

Referring to FIG. 5, an outboard motor 100 has an upper structure such as an engine housed in a cowling 9 comprising an upper cowling 91 and a lower cowling 92.
An upper casing 93 is provided below the lower cowling 92.
And a lower casing 94 are sequentially connected. A drive shaft connected to the crankshaft of the engine extends to a lower end inside the upper casing 93 and the lower casing 94 and is connected to a propeller 95 at the lower end. The upper casing 93 has a bracket 9.
9 is provided, and a clamp bracket 96 is attached to the tip of the bracket 99 via a tilt shaft 97.
This clamp bracket 96 is used for the transom 101 of the hull.
And fixed by being clamped by a clamp handle 98.

In a normal operation state, the outboard motor 100 is maintained in a substantially vertical posture as shown by the imaginary line in FIG. The propeller 95 can be raised (tilted up) above the water surface, and the cowling 9 can be raised.
The outboard motor 100 can be rotated (steered) around a vertical axis (not shown) by a steering handle 90 provided to protrude forward from the side of the motor.

As shown in FIGS. 2 to 4, this engine is of the OHV type, and its cylinder body 1 is installed so that the crankshaft 13 is oriented in the vertical direction. A shaft 42 is arranged, and the rotational torque of the crankshaft 13 is transmitted to a propeller shaft horizontally installed at a lower end portion of the outboard motor via a drive shaft (not shown) extending downward to rotate the propeller. ing.

The cylinder body 1 has a rear side (FIG. 2).
A cylinder head cover 12 is coupled to the rear side, a fuel tank 4 is arranged at the front side of the cylinder body 1, and an oil pan 14 is formed at a lower part. . A manual starter 3 is disposed above the cylinder body 1, and a carburetor 7 is disposed above the cylinder head 11 behind. This carburetor 7
Are arranged to be inclined with respect to the cylinder direction of the engine in plan view.

A silencer is connected to one side of the carburetor 7 so that an intake pipe 71 extends downward, and an intake port is opened downward at a lower end thereof. The other side of the carburetor 7 has an intake manifold 73.
The intake manifold 73 is bent into a U-shape and guided to the cylinder head 11 below the intake manifold 73.

As shown in FIGS. 1 to 4, the water jacket 10 of the cylinder body 1 is provided with an opening 105 for allowing cooling water to pass therethrough. The member 5 is detachably attached. The opening 105 is formed near the highest position of the water jacket of the cylinder body 1 and on one side of the water jacket. A thermostat 6 having an on-off valve and an anode 8 for electrochemical protection are mounted on the mounting member 5 so as to face the water jacket 10 and close to the cylinder 18.

The mounting member 5 is shown in FIGS.
It is configured as shown in FIG. That is, the mounting member main body 50 includes a concave portion 51 facing the outlet of the thermostat 6 and a mounting portion 52 for the anticorrosion anode 8, and bolt holes 54, 55, for mounting the mounting member 5 to the cylinder body 1 on the peripheral edge portion. 56 are formed. This recess 51
Is formed with a discharge port 53 for discharging cooling water, and a screw hole 57 is formed in the mounting portion 52. Then, the mounting bolt 81 is screwed into the screw hole 57 via the anticorrosion anode 8 to fix the anticorrosion anode 8. The flange 19 of the opening 105 and the mounting member 5
The thermostat 6 is mounted by clamping the flange portion 69 of the thermostat 6 with the flange 59 of the thermostat 6 and tightening it with the mounting bolt 58. The thermostat 6 and the anticorrosion anode 8 are arranged close to each other and opposed to the cylinder 18. And are arranged in close proximity.

In this mounted state, the thermostat 6 is in a horizontal position, the temperature sensing portion 65 of the thermostat 6 is disposed so as to protrude into the water jacket 10, and the valve seat 61 and the valve body 62 are placed in the concave portion 51 of the mounting member 5. It is arranged to protrude. As shown in FIGS. 10 and 11, relief grooves 63 are formed in the valve body 62 at appropriate intervals in the circumferential direction.
Even when the valve is closed, a small amount of water and air is always allowed to escape through the escape groove 63.

The cooling water circulation system is configured as shown in FIG. That is, the cooling water is sent out from the water pump 80 arranged in the lower casing of the outboard motor through the pipe 801 through the upper casing 93, and the pipe 801 cools the oil by passing through the oil pan 82, and then cools down. The cooling water is sent into the water jacket of the cylinder body 1 and the cylinder head 11 to cool the engine, and then sent to the mounting member 5 located near the outlet of the cylinder body 1. Then, these parts are cooled by the return pipe 802 through the cylinder head 11 and the oil pan 82, and are discharged from the lower casing of the outboard motor. The cooling water sent to the vicinity of the outlet of the cylinder body 1 reaches around the thermostat 6 and the anticorrosion anode 8 as shown in FIGS. A measurement is made.
The cooling water that has reached here rises in temperature by absorbing the heat of the cylinder body 1 and the cylinder head 11 generated by the operation of the engine, and when the water temperature reaches a predetermined set value, the valve 6
2 opens the valve by moving in the direction of the arrow in FIG.
The cooling water in the water jacket 10 is discharged from the recess 51 through the outlet 53 into the return pipe 802.

In the above configuration, when starting the engine, first, cooling water is supplied into the water jacket 10.
At this time, the thermostat 6 is connected to the water jacket 10.
Is located at the highest position of the thermostat 6, as the cooling water is supplied into the water jacket 10, the air inside the thermostat 6 closes the valve relief groove 63.
The cooling water is smoothly filled without air remaining in the water jacket 10. Note that even after the cooling water is filled, the cooling water is released little by little through the release groove 63 while the valve is closed.

When the engine is stopped, there is a problem that the cooling water freezes when the outside air temperature is low, and water evaporates due to the heat of the engine, and salts in the cooling water condense and block the passage. There is a risk. Therefore, when the engine is stopped, it is necessary to drain water immediately. In this case, air enters through the relief groove 63 of the thermostat 6 installed at a high position in accordance with the removal of the cooling water, thereby promoting the removal of the water. In addition, when the performance of the thermostat 6 deteriorates due to deterioration with time, the set temperature usually rises, but when the water temperature rises (especially when the temperature rises to 60 ° C. or more), corrosion tends to occur. Since the anticorrosion anode 8 is installed near the thermostat 6, that is, at a position where the temperature of the cooling water is high, the rise of the cooling water that promotes the occurrence of corrosion is suppressed, and the anticorrosion action is effectively performed.

Since the mounting member 5 is common to the thermostat 6 and the anode 8, the mounting and removal for inspection and replacement can be performed simultaneously by a single mounting member 5. Work can be performed easily. Also, by using a common mounting member, the structure is simplified and the space is saved.
In the case of an HV type engine, there is no camshaft timing belt on the engine side, and a space can be provided, which is preferable for downsizing of the outboard motor. Further, the mounting bolt 58 of the mounting member 5 to which the anode 8 is mounted is also
Since the mounting member for the thermostat 6 is used in common, the number thereof is also increased, and thereby the conduction with the cylinder body 1 is improved, so that the anticorrosion effect is better achieved. For this reason, even when the performance of the thermostat 6 is deteriorated due to long-term use and the operating temperature rises, the temperature of the cooling water rises and the corrosion tends to occur. Can be prevented. In addition, since the thermostat 6 is installed in a horizontal position, the valve seat 6 is compared to a case where the valve seat is in a horizontal position.
There is also an advantage that foreign matter in the cooling water is hardly caught between the valve body 1 and the valve body 62, and the life of the valve is increased.

[0027]

According to the first aspect of the present invention, since the mounting member is common for the thermostat and the anode, the inspection and replacement for inspection and replacement can be performed simultaneously by a single mounting member. Work can be performed easily. Further, by using a common mounting member, there is an advantage that the structure is simplified and the space is saved. When the performance of the thermostat deteriorates due to deterioration over time, the set temperature usually rises.However, when the water temperature rises, corrosion tends to occur. Since the anticorrosion anode is installed near the thermostat, the anticorrosion effect is effectively achieved. In addition, the number of mounting bolts of the mounting member to which the anode is mounted is also increased because the mounting bolts for the thermostat are shared, so that conduction with the cylinder body is improved,
The anticorrosion effect is better achieved. Therefore, even if the performance of the thermostat deteriorates due to long-term use and the operating temperature rises, the temperature of the cooling water rises and corrosion tends to occur. can do.

According to the second aspect of the present invention, since the thermostat is disposed near the highest position of the water jacket, the internal air is passed through the thermostat valve as the cooling water is supplied into the water jacket. As a result, the cooling water is smoothly filled without air remaining in the water jacket.

Further, when the engine is stopped, it is necessary to immediately drain the water. In response to the extraction of the cooling water, air enters through a thermostat valve installed at a high position. Will be promoted. Particularly in the case of an OHV engine, there is no camshaft timing belt on the side of the engine, and a space can be provided, which is preferable for downsizing the outboard motor.

According to the third aspect of the present invention, since the thermostat is installed in a horizontal posture, there is also an advantage that foreign matter in the cooling water is hardly caught between the valve seat and the valve element.

According to the fourth aspect of the present invention, there is no camshaft timing belt on the side of the engine, so that a space can be provided, which is preferable for downsizing of the outboard motor.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view taken along the line AA of FIG. 3 showing a thermostat and an anticorrosion anode mounting portion in the configuration of FIG.

FIG. 2 is a side view of the upper structure of the outboard motor showing the embodiment of the present invention.

FIG. 3 is an enlarged view of a main part of FIG. 2;

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is a side view showing a state where the outboard motor is attached to the hull;
The tilted state is indicated by a solid line, and the normal operation state is indicated by a virtual line.

FIG. 6 is a front view of a mounting member for the thermostat and the anticorrosion anode.

FIG. 7 is a rear view of FIG. 6;

FIG. 8 is a sectional view taken along line BB of FIG. 6;

FIG. 9 is a sectional view taken along line CC of FIG. 6;

FIG. 10 is a side view of the lower half of the thermostat in section.

FIG. 11 is an enlarged sectional view of the valve opening / closing section of FIG.

FIG. 12 is a diagram of a circulation system of cooling water for the engine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder body 5 Mounting member 6 Thermostat 8 Corrosion prevention anode 10 Water jacket 11 Cylinder head 18 Cylinder 50 Mounting member main body 51 Depression of mounting member 52 Anode mounting portion of mounting member 53 Cooling water outlet 100 Outboard motor

Claims (4)

[Claims] An opening for passing cooling water is formed in a water jacket of a cylinder body of an engine, and a single attaching member having a drain port is detachably attached to the opening, and the attaching member is attached to the opening. A thermostat having an on-off valve and an electrochemical anticorrosion anode are mounted so as to face the water jacket, respectively.
A drainage channel is connected to the drainage port of the mounting member, and the thermostat is configured to open a valve when the set temperature is reached and to flow the cooling water in the water jacket to the drainage port. Anode installation structure of the machine. 2. The anode installation structure for an outboard motor according to claim 1, wherein the opening is formed near a highest position of a water jacket of the cylinder body. 3. An outboard motor anode installation according to claim 2, wherein said opening is formed in one side of a water jacket, and said thermostat is mounted on said mounting member in a substantially horizontal direction. Construction. 4. The anode installation structure for an outboard motor according to claim 1, wherein said engine is an OHV type.