JPS62243979A - Water pump protective device for marine propeller - Google Patents

Abstract

PURPOSE:To protect a water pump from waterless operation, by providing a tank, which contains pump cooling fluid, and a cooling fluid supplying means which supplies the pump cooling fluid in the tank to the inside of the water pump. CONSTITUTION:An outboard engine 10 has an engine 14 and a water pump 19, and the water pump 19 forces the outside water to be fed to a water jacket 29 of the engine 14. The outboard engine, in which an oil tank 38 contains oil serving as the pump cooling fluid, mounts a manual pump 42, serving as the cooling fluid supplying means, to be interposed in the intermediate part of a feed oil pipe 39, and when the engine 14 is started, the oil can be supplied into the water pump 19. Consequently, friction heat, generated between an impeller of the water pump and the internal surface of an impeller chamber, is cooled, and the water pump is prevented from the generation of its damage.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a water pump protection device for a marine vessel propulsion device.

[Prior Art] A marine propulsion device such as an outboard motor or an inboard/outboard motor is equipped with a propulsion drive unit, and a peripheral portion of an impeller driven in conjunction with the propulsion drive unit is pressed against the inner surface of the impeller chamber. Some types include a water pump that elastically slides into contact with each other and pumps outside water, and the propulsion drive unit is cooled by the outside water pumped by the water pump.

By the way, in marine propulsion systems used for large ships or rescue boats stored on land, the propulsion drive unit is started before the rescue boat floats on the surface of the water for emergency relief dispatch. , then transported into the water.

[Problems to be Solved by the Invention] However, when the propulsion drive unit is driven while being stored on land or on a ship, as described in (h), the water pump that is driven in conjunction with the propulsion drive unit is The system operates without water, without drawing in outside water, that is, it runs idly without cooling. As a result, in the water pump, frictional heat between the impeller and the inner surface of the impeller chamber may cause melting of the impeller, deformation of the inner surface of the impeller chamber, etc., and the pump function may be impaired.

In addition, if the pumping function of the water pump is impaired, there is a risk of engine trouble due to inability to cool the water when the marine propulsion device is brought into the water.

An object of the present invention is to prevent damage to a water pump that is operated without a tree in conjunction with the propulsion drive section when the propulsion drive section is driven while being stored on land or on a ship.

Means for Solving Problem E] The present invention includes a propulsion drive unit, and elastically slides the peripheral portion of an impeller driven in conjunction with the propulsion drive unit while being pressed against the inner surface of the impeller chamber. In a water pump protection device for a marine propulsion device, the device is equipped with a water pump that is in contact with the pump and pumps outside water, and the propulsion drive unit is cooled by the outside water that is pumped by the wooden pump. The wooden pump is provided with a cooling fluid supply means for supplying the pump cooling fluid to the inside of the wooden pump.

[Function] According to the present invention, the main body of the propulsion unit can be used on land without being submerged in water! - Alternatively, when the propulsion drive is started under shipboard storage conditions, the pump cooling fluid in the tank can be supplied into the wood pump by actuation of the cooling fluid supply means. As a result, the water pump receives the cooling action of the pump cooling fluid to cool the frictional heat between the impeller and the inner surface of the impeller chamber, thereby preventing the impeller from melting and deforming the inner surface of the impeller chamber. That is, according to the present invention, it is possible to reliably prevent damage to the water pump that is operated without water in conjunction with the propulsion drive unit.

[Embodiment] Fig. 1 is a side view showing an outboard motor to which the first embodiment of the present invention is applied, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig.
The figure is a sectional view taken along the line ■--■ in FIG. 2, and FIG. 4 is a sectional view taken along the line IV--IV in FIG.

The outboard motor 10 connects its propulsion unit 13 to the hull 13 via a clamp bracket 11 and a swivel bracket 12.
A is fixed as rTl f@. Jashin unit 13
is equipped with an engine 14 as a propulsion drive unit, and the output of the engine 14 is connected to a drive shaft 15 and a forward/reverse switching tooth device 1.
6. Transmission to the propeller 18 via the propeller shaft 17 Of
It is considered to be Noh. 10A is a cowling that covers the engine 14.

A water pump 19 that is driven in conjunction with the engine 14 is housed inside the propulsion unit 13 . water pump 1
9 is constructed as shown in FIGS. 2 to 4. That is, 20 is a housing made of resin and has four parts 21 that open downward and a discharge passage 22. A metal insert 23 is fitted into the four parts 21 of the housing 20. The lower surface of the housing 20 is liquid-tightly closed by a bottom plate 24 to form an impeller chamber 25 inside the insert 23. An impeller chamber 25 and a discharge passage 22 are formed on a part of the circumferential surface of the housing 20 and the insert 23.
A discharge port 26 is formed to communicate with. In addition, a part of the bottom plate 24 has a suction port 2 that opens into the impeller chamber 25.
7 is formed.

The discharge passage 22, the engine 14, and the
The water pipe 28 extending toward the i! I'A has been done. 29 is a water jacket provided in the engine 14. In addition, 1-note suction "127.

The suction passage 30, the propulsion unit, and the suction port 31 opened at a portion of the outer surface of the housing 13 that is equivalent to being submerged in water are in communication with each other.

Further, a drive shaft 15 passes through the impeller chamber 25, and an impeller 32 is attached to the penetrating portion of the drive shaft 15. Drive shaft 15 and impeller 32
is so that its center is located closer to the discharge port 26,
It is eccentrically arranged inside the impeller chamber 25. The impeller 32 is made of rubber, has a plurality of bays 734 integrally formed on the outer circumference of the boss portion 33, and has a bush 35 integrated on the inner circumferential surface of the boss portion 33. is fixed. That is, impeller 3
The second vane 34 is in sliding contact with the inner surface of the impeller chamber 25, that is, the inner surface of the insert 23 and the bottom plate 24, so that a pump chamber 37 can be formed between the two adjacent vanes 30.

Here, due to the eccentric arrangement of the impeller 32, the volume of the pump chamber 37 increases when the suction port 27 is in the open position, and the pump chamber 37 sucks outside water from the suction port 127, and
At the position facing 6, its volume is reduced to enable pumping of this water.

As a result, the water pump 19 pumps outside water to the water jacket 29 of the engine 14, making the engine 14 capable of water cooling.

Thus, the outboard motor 10 has an oil tank 38 fixed to the side of the engine 14 covered by the cowling IOA. The oil tank 38 contains oil as a pump cooling fluid. One end of an oil feed pipe 39 is connected to an oil outlet of the oil tank 38 . On the other hand, the water pump 19 is provided with an oil inlet [140 in the insert 23 and a housing 2 corresponding to the oil inlet 40].
A connecting pipe 41 is installed at 0, and the other end of the oil feed pipe 39 is connected to this connecting pipe 41. In addition, oil injection 1140
are arranged opposite to a portion of the bottom plate 24 where the suction port 27 is not provided.

Further, a manual pump 42 as a cooling fluid supply means is interposed in a middle portion of the oil pipe 39 located inside the cowling 10A. The pump 42 is of a piston type, and its knob is disposed on the outer surface of the bottom portion of the cowling IOA. In addition, the filtration pipe 4 of the oil supply pipe 39
A check valve 43 that only allows oil to move toward the water pump 19 is installed in a portion adjacent to the water pump 19 .

Next, the operation of the first embodiment will be explained.

According to the first embodiment, the cooling fluid is supplied when starting the engine 14 as the propulsion drive part of the propulsion unit 13 as the main body of the propulsion device when it is stored on land or at sea without being submerged in water. The operation of the pump 42 as a means makes it possible to supply oil as a pump cooling fluid inside the tank 38 into the water pump 19 .

As a result, the wooden pump 19 receives the cooling effect of the oil as the pump cooling fluid, and cools down the frictional heat between the impeller 32 and the inner surface of the impeller chamber 25, causing melting of the impeller 32 and the inner surface of the impeller chamber 25. This prevents the occurrence of deformation, etc.

That is, according to the first embodiment, it is possible to reliably prevent damage to the water pump 19 which is operated without water in conjunction with the engine 14.

FIG. 5 is a side view showing an outboard motor to which a second embodiment of the present invention is applied.

Portions in the outboard motor 50 of the second embodiment that are substantially the same as those in the outboard motor 10 of the first embodiment are designated by the same reference numerals. The outboard motor 50 differs from the outboard motor 1O in the following points.

That is, the outboard motor 50 has an oil tank 51 for supplying 1111 ftN of oil to the two-stroke engine 14;
An oil pump 52 is provided. Also, oil tank 5
1 is connected to one end of an oil feed pipe 53, and the other end of the oil feed pipe 53 is connected to the inside of a water pump similarly to the outboard motor 10. Here, at the middle part of the oil pipe 53, the cowling IOA
A pump 54 as a cooling fluid supply means is interposed in a portion located inside. The pump 54 is of a piston type, and the operating end of the pump 54 is connected to the engine 1.
The rotary lever 56 of the carburetor 55 provided at 4 serves as a pushing rotation part. That is, when the engine 14 is started, the pump 54 is driven in conjunction with the choke operation of the choke lever 56, so that the oil in the oil tank 51 can be reliably supplied to the inside of the water pump.

FIG. 6 is a drive circuit diagram of a pump constituting a third embodiment of the present invention.

The pump 60 of the third embodiment is installed in the middle of an oil pipe 61 that communicates between an oil tank containing pump cooling fluid and the inside of a water pump, and an electromagnetic coil 63 is excited by opening and closing a remote switch 62. It becomes a driving circuit by operation. 64 is a power source, 65 is a driving link, 66 is a driven link, and 66A is a swinging fulcrum of the driven link 66.

Note that the oil as the cooling fluid according to the present invention may be the gear oil in which the forward/reverse switching gear system 2!116 of the outboard motor 10 is immersed, or the engine oil of a 4-stroke engine. In addition to oil, the cooling fluid may include 4-ethyl glycol, water, etc.
Since 4-ethyl glycol has antifreeze properties at low temperatures, it can be used at all times even in cold regions.

Furthermore, in implementing the present invention, if the tank containing the pump cooling fluid is installed more vertically than the water pump, it is also possible to supply the cooling fluid by using the head difference between the two. Therefore, it is also possible to use a cock provided in the cooling fluid supply path as the cooling fluid supply means.

Note that the tank in the present invention is not limited to a specific container, and may include the cylinder block itself forming the crank chamber in a 4-cycle engine, or the propulsion unit 1 in an engine that uses gear oil as a cooling fluid.
The casing part 3 itself becomes the tank.

Furthermore, the present invention is also applicable to inboard and outboard motors.

[9. Effect of light] As described in 1- below, the present invention includes a propulsion drive unit and presses the peripheral portion of the impeller driven in conjunction with the propulsion drive unit against the inner surface of the impeller chamber. In water pump protection equipment for marine propulsion equipment, which is equipped with a wooden pump that makes sliding contact with the wooden pump and pumps outside water under pressure, and cools the propulsion drive unit with the outside water pumped by the wooden pump, it houses the pump cooling fluid. The water pump is equipped with a tank for cooling the water pump, and a cooling fluid supply means for supplying the pump cooling fluid in the tank to the inside of the water pump.

Therefore, according to the present invention, when the propulsion drive unit is started while the propulsion unit is stored on land or on board a ship without being submerged in water, the cooling fluid supply means is activated to cool the tank. It becomes possible to supply pump cooling fluid into the water pump. As a result, the water pump receives the cooling action of the pump cooling fluid to cool down the frictional heat between the impeller and the inner surface of the impeller chamber, thereby preventing the impeller from melting and deformation of the inner surface of the impeller chamber. That is, according to the present invention, it is possible to reliably prevent damage to the water pump that is operated without trees in conjunction with the propulsion drive unit.

[Brief explanation of drawings]

FIG. 1 is a side view showing an overcharged outboard motor according to a first embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-H in FIG. 1.
Figure 3 is a cross-sectional view taken along the line m-m in Figure 2, and Figure 4 is a cross-sectional view of the
FIG. 5 is a side view showing an outboard motor to which the second embodiment of the present invention is applied, and FIG. 6 constitutes a third embodiment of the present invention. It is a drive circuit diagram of a pump. lO...outboard motor, 13...propulsion unit/), 14
...Engine, 19...Water pump. 25... Impeller chamber, 38... Oil tank, 39
...Oil feed pipe, 40...Oil inlet, 42..."
dynamic pump, 50... outboard motor, 51... oil tank, 53... oil feed pipe, 54... pump, 56... choke lever, 60... pump, 61... oil feed pipe ,
62...Remote switch, 63...Electromagnetic coil. Agent Patent Attorney Osamu Shiokawa Figure 1, /, -10A Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (4)

[Claims] (1) A water pump is equipped with a propulsion drive unit, and the peripheral part of an impeller driven in conjunction with the propulsion drive unit is pressed into elastic sliding contact with the inner surface of the impeller chamber, and pumps outside water under pressure. A water pump protection device for a marine propulsion device that cools the propulsion drive unit with external water pumped by the water pump, which is equipped with a tank that accommodates the pump cooling fluid, and the pump cooling fluid in the tank is transferred to the inside of the water pump. 1. A water pump protection device for a marine propulsion device, comprising: a cooling fluid supply means. (2) The water pump protection device for a marine vessel propulsion device according to claim 1, wherein the cooling fluid supply means is a manual pump. (3) The water pump protection device for a marine vessel propulsion device according to claim 1, wherein the cooling fluid supply means is a pump driven in conjunction with the starting operation of the propulsion drive unit. (4) The water pump protection device for a marine vessel propulsion device according to claim 1, wherein the cooling fluid supply means is a pump driven by electrical operation.