JPH0733157B2 - Water propulsion system for ship propulsion - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water amount adjusting device for a ship propulsion device.

[0002]

2. Description of the Related Art In outboard motors, outboard motors, etc., a water jacket is formed on a cylinder body and a cylinder head that form an engine body, and a flow control valve that opens and closes according to changes in water temperature and water pressure in the water jacket. It is provided on the outlet side of the water jacket, and the flow rate of cooling water in the water jacket can be adjusted according to the operating condition of the engine.

The control valve is mounted on the outer surface of the engine body. The engine body includes a starting motor, a fuel supply system component, a throttle operation link system component, and a forward / reverse switching operation link system. It is necessary to mount a large number of engine auxiliary parts such as constituent parts and constituent parts of the electrical component system, and therefore it is desirable to install a control valve that does not significantly project from the engine body and does not interfere with other parts.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a control valve is arranged at a position advantageous in constructing a cooling system at a position where it does not interfere with other parts and the size of the engine periphery does not increase. The purpose is to make it easy to maintain the control valve.

[0005]

According to the present invention, in a water amount adjusting device for a ship propulsion device, a cylinder is horizontally arranged in a cylinder body of an engine, and the flow rate of cooling water in a water jacket of the engine is detected by detecting the temperature. The control valve is adjusted by a control valve having a function of operating the valve, and the control valve is arranged in a space above the exhaust passage arrangement portion on the side of the cylinder body, and a control valve cap covering the control valve is provided in the cylinder. Fixing to the body is the technical means.

[0006]

[Operation] When the temperature of the cooling water in the water jacket of the engine rises above the set temperature by operating the ship propulsion device,
The control valve senses the temperature and operates the valve, and the cooling water is discharged. Since the control valve is disposed in the upper void portion of the exhaust passage disposition portion, the control valve can quickly detect an increase in the engine temperature as well as the cooling water temperature and adjust the water amount.

[0007]

1 and 2 are views showing an embodiment of the present invention. The outboard motor 10 is attachable to the hull via a bracket 11 so as to be tiltable and steerable. Outboard motor
An engine 12 is mounted on an upper portion of the engine 10. The output of the engine 12 is transmitted to a lower propeller shaft 14 via a drive shaft 13 to allow a propeller 15 directly connected to the propeller shaft 14 to rotate.

The engine 12 is covered with a cowling 16 in order to avoid troubles caused by fogging of drainage, rainwater and the like. Then, the cowling 16 has an air intake portion 17 capable of introducing combustion air into the engine 12 from the external space.
Is equipped with. The engine 12 has an engine body 20 composed of a cylinder body 18, a cylinder head 19 and the like shown in FIG. 2, and the cylinders are horizontally arranged in the cylinder body 18. In FIG. 2, reference numerals 21 and 22 denote an inner exhaust cover and an outer exhaust cover, which are fastened together to the side of the cylinder body 18.

The engine body 20 is provided with a water jacket 23 which allows cooling water to circulate. Water jacket 23
A water pump 25 is connected to the inlet of the water tank via a water supply channel 24. The water pump 25 can be driven by the rotation of the drive shaft 13. That is, the water pump 25 is
It is possible to pump the external water, which is driven during the operation of (1) and sucked in from the outside, to the water jacket 23 via the water supply channel 24. The outlet side of the water jacket 23 is connected to the drainage channel via the control valve 26.
It is possible to communicate with 27. Ie water jacket 23
When the internal water temperature reaches or exceeds a predetermined value, the control valve 26 is opened, and the cooling water after cooling the engine 12 can be discharged from the drainage channel 27 to the outside.

The control valve 26 is arranged at a side portion of the cylinder body 18 constituting the engine body 20 above the exhaust passage. Reference numeral 28 denotes a cap of the control valve 26, which is fixed to the cylinder body 18 in a state in which the inner exhaust cover 21 is pinched by bolts 29. The cap 28 for the control valve 26 has a portion that covers the discharge side of the control valve 26, and a slightly thin protrusion is formed at the opening of the cap 28. A support portion 30 that holds an elastic body such as rubber in combination is formed on the flange portion of the outer peripheral portion of the valve seat 31 of the control valve 26, and the support portion 30 is fitted to the recessed seat surface formed in the cylinder body 18. Are combined. The protrusions of the cap 28 are inserted into the insertion holes formed in the inner exhaust cover 21, and the bolts 29 are inserted into the bolt holes of the two flange portions of the cap 28 to fix the cap 28 to the cylinder body 18. The discharge side of the control valve 26 is covered by the cap 28, and the support portion 30 of the control valve 26 is clamped and held by the protrusion of the cap 28 and the cylinder body 18, and at the same time, the inner exhaust cover 21 is clamped by the cap 28 and the cylinder body 18. It The two flange portions of the cap 28 are located on the side surface of the engine 12 below the upper surface of the cylinder body 18, and are provided in front of and behind the center of the cap 28.

A frame-shaped housing 32 is hung under the valve seat 31 in a fixed state.
33 bases are supported. The temperature-sensitive operating body 33 has a built-in wax that increases in volume due to an increase in ambient temperature, and has an actuator 34 that projects due to the increase in volume, and the upper end of the actuator 34 can be connected to the valve seat 31. Valve body
35 is fixed. Support legs for the actuator 34 and valve body 35
The upper ends of 36 are integrated with each other. Each leg portion of the support leg portion 36 is arranged radially in a plurality of directions around the temperature-sensitive actuator 33,
A compression spring 37 is held between the valve seat 31 and the back surface thereof. That is, when the water temperature in the water jacket 23 is equal to or lower than the predetermined value, the valve body 35 is brought into contact with the valve seat 31 by the urging force of the compression spring 37, which enables the control valve 26 to be closed and the water jacket 23. When the water temperature inside reaches a predetermined value or higher, the temperature sensitive actuating body 33 is operated to separate the valve body 35 from the valve seat 31, and the control valve 26 can be opened.

The operation of this embodiment will be described. When the water pump 25 is activated by starting the engine 12, external water is supplied to the water jacket 23 via the water supply passage 24, and cools the cylinder body 18 and the cylinder head 19 that form the engine body 20. This cooling water stays around the control valve 26 in the water jacket 23. When the cooling water temperature reaches a predetermined value or more, the operator 34 of the temperature sensitive actuator 33 projects against the biasing force of the compression spring 37, the valve body 35 separates from the valve seat 31, and the control valve 26 is opened. After cooling the engine 12, the cooling water is discharged to the outside through the drainage channel 27.

In this embodiment, a control valve 26 is arranged in a side space of the engine body 20 in a space above the exhaust passage. Here, the upper portion of the side portion of the engine main body 20 is not arranged with the engine auxiliary component and is separated from various components arranged in other portions, and bulges greatly toward the engine side of the cowling 16. There is no possibility of causing interference with the air intake section 17 and the like. Therefore, the control valve 26 is provided at the portion so that the cowling 16 is provided.
In a limited space surrounded by the engine body 20, the engine body 20 can be compactly attached without significantly protruding from the engine body 20 and without interfering with other parts. Therefore also the control valve
Maintenance workability for 26 is also good.

In this embodiment, in the engine 12, a space is provided above the exhaust passage disposition portion provided on the side portion of the cylinder body 18. Therefore, when arranging the control valve 26 in this space, use the space to dispose the control valve 26 at a position where it does not interfere with other parts and the size of the engine periphery does not increase. You can Since high-temperature exhaust gas passes through the exhaust passage of the cylinder body 18, the temperature around the exhaust passage rises faster than other parts. Therefore, in the upper part of the exhaust passage arrangement part,
By arranging the control valve 26 having the function of sensing the temperature and operating the valve, the amount of water can be regulated by quickly sensing the rise of the engine temperature together with the cooling water temperature. That is, the control valve 26 can be arranged at a position advantageous for constructing the cooling system. Since the cap 28 that covers the control valve 26 is provided, the control valve 26 can be easily maintained by removing the cap 28. Also, the cap 28 of the control valve 26
Since the bolt for fixing is used at least for mounting the inner exhaust cover 21, the bolt used only for mounting the cap 28 is unnecessary, and the number of assembly steps can be reduced.

This embodiment has described the case where the present invention is applied to a water amount adjusting device provided with a control valve having a temperature sensitive valve type function. However, the present invention shows that the valve element is changed by the pressure change in the water jacket, for example. The present invention is also applicable to a water amount adjusting device equipped with a control valve having both a pressure-sensitive function that enables contact with and separation from a valve seat and the temperature-sensitive function.

[0016]

According to the present invention, in a water quantity adjusting device for a boat propulsion machine, the flow rate of cooling water in a water jacket of an engine is adjusted by a control valve having a function of sensing temperature and operating the valve. The control valve is arranged in a space above the exhaust passage arrangement portion in the side portion. In addition, in the engine of the marine vessel propulsion device, a space is provided above the exhaust passage arrangement portion provided on the side portion of the cylinder body. Therefore, by arranging the control valve in this space, the space can be effectively used, and the control valve is arranged at a position where it does not interfere with other parts and does not increase the size of the engine periphery. be able to. Further, since the high temperature exhaust gas passes through the exhaust passage on the side portion of the cylinder body, the temperature around the exhaust passage rises faster than the other portions. Therefore, if a control valve having a function of sensing the temperature and operating the valve is disposed above the exhaust passage, the amount of water can be regulated by quickly sensing the rise of the engine temperature as well as the cooling water temperature. be able to. That is, the control valve can be arranged at a position advantageous for constructing the cooling system. Further, in the present invention, since the control valve cap covering the control valve is fixed to the cylinder body, the control valve can be easily maintained by removing the cap.

[Brief description of drawings]

FIG. 1 is a side view showing an outboard motor to which an embodiment of the present invention is applied.

FIG. 2 is a front view showing a main part of an embodiment of the present invention in a cutaway manner.

[Explanation of symbols]

 12-Engine 18-Cylinder body 23-Water jacket 26-Control valve. 28-Cap

Claims (1)

[Claims] 1. A marine propulsion device in which a cylinder is horizontally arranged in a cylinder body of an engine, and a flow rate of cooling water in a water jacket of the engine is adjusted by a control valve having a function of sensing a temperature and operating the valve. In the water amount control device, the control valve is disposed in a space above the exhaust passage disposition portion on a side portion of the cylinder body, and a control valve cap covering the control valve is fixed to the cylinder body. Water volume control device for ship propulsion.