JPH0640079Y2 - Outboard motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an outboard motor provided with a radiator for cooling a cooling liquid returning from a water jacket of an engine.

[Conventional technology]

Generally, in the outboard motor, the engine is often cooled by taking in seawater or the like. But with this method,
As is well known, various disadvantages occur.

Therefore, conventionally, there is an outboard motor equipped with the radiator (see, for example, JP-A-61-211197). An example of this is shown in FIG.

In FIG. 7, a cavity 53 is provided above the cage plate 52 in the lower case 51 of the outboard motor 50. A radiator 54 to which the fresh water cooling liquid that has cooled the engine (not shown) returns is disposed in the cavity 53. Then, due to the dynamic pressure generated at the time of traveling, seawater is taken into the cavity 53 to cool the radiator 54,
The fresh water cooling liquid in the radiator 54 is efficiently cooled.

[Problems to be solved by the device]

However, in this conventional technique, a cooling water passage (not shown) for taking in seawater is required in the hollow portion 53, so that the structure of the outboard motor becomes complicated.

Therefore, as shown in FIG. 8, the cage plate 52
The portion of the outboard motor 50 facing the radiator 54 is cut out, and the seawater is guided into the cavity 53 through the cutout 55.
There is. However, according to this method, the cavitation plate 52 is notched, so that the cavitation cannot be sufficiently prevented. Moreover, the radiator has a thin structure
The lower surface of the 54 is exposed to seawater that causes a strong swirling flow due to the high-speed rotation of the propeller 56. Therefore,
The radiator 54 must be thick because of its strength.

This invention has been made in view of the above circumstances, without complicating the structure, while sufficiently achieving the effect of preventing cavitation and the protection of the radiator from seawater causing a strong swirling flow, An object of the present invention is to provide an outboard motor capable of efficiently cooling a cooling liquid with seawater.

[Means for Solving the Problems]

In order to achieve the above object, the outboard motor according to the present invention comprises:
The radiator that cools the cooling liquid returning from the water jacket of the engine is located at the rear of the left and right outer parts of the case of the outboard motor and projects sideways from just below the upper and lower split surfaces of the case. The radiator is disposed between the provided splash plate and the cavitation plate disposed below the splash plate, and the lower surface side of the radiator is covered so as to face the cavitation plate.

[Action]

According to this invention, a radiator provided at a position close to a rear portion on both left and right outer sides of the main body case is disposed on the upper and lower split surfaces of the main body case, the splash plate being provided so as to project laterally from just below and below the splash plate. Since it is located between the cavitation plate and the cavitation plate, the seawater that hits the front part of the body case splashes as it sails, hits the splash plate, and then part of the splash hits the cavitation plate and bounces off. The radiator will be bathed in. Therefore, it is not necessary to provide a notch in a special passage or cavitation plate for taking in seawater,
The cavitation plate keeps the cavitation prevention effect sufficient, and the radiator is not directly exposed to the seawater that causes a strong swirling flow. It is possible to cool efficiently.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1 showing a first embodiment, an outboard motor 1 has an engine 2 at an upper portion thereof and a body case 5 composed of an upper ace 3 and a lower case 4 below the engine 2. 6 is a propulsion device, and 6a is its propeller. An intake 7 for taking in external water is provided in the lower case 4 slightly above the propulsion device 6. In addition, 5a is a dividing surface between the upper case 3 and the lower case 4, W is a surface of water while sailing, Wa
Is the water surface when anchored.

A splash plate 4b protruding laterally of the outboard motor 1 is provided immediately below the dividing surface 5a. Radiators 8A and 8B are disposed on the left and right, further below the splash plate 4b and slightly above the cavitation plate 4a. The radiators 8A and 8B cool the fresh water cooling liquid returning from the water jacket (not shown) of the engine 2, and include a cooling section 8a including a large number of pipes and cooling fins (not shown), and both sides of the cooling section 8a. And a tank portion 8b provided in the. This radiator 8A, 8
B is exposed and provided on the rear side on both sides outside the lower case 4, and the lower surface side 8c thereof faces the cage plate 4a shown by the alternate long and short dash line in FIG. In this embodiment, the lower surface 8c (Fig. 1) of the radiator 8A, 8B is completely covered by the cavitation plate 4a.

In FIG. 8, reference numeral 9 denotes a drive shaft, which transmits the drive force of the engine 2 of FIG. 1 to the propulsion device 6 as is well known. In the drive shaft 9 shown in FIG. 8 above, in the vicinity of the dividing surface 5a,
A first water pump 10 and a second water pump 20 are provided axially adjacent to each other. The first water pump 10 is a centrifugal pump, while the second water pump 20 is a vane pump.

In FIG. 4, the first water pump 10 comprises an upper housing 10a, a lower housing 10b, an impeller 10c, a mechanical seal 10d, a suction pipe 10e and a discharge pipe 10f. The lower housing 10b is integrally formed with the upper housing 20a of the second water pump 20. In addition, 30 is an oil seal.

Next, the first cooling device will be described.

In FIG. 3, the first cooling device is a circulation type cooling device in which the first water pump 10 and the radiators 8A and 8B are arranged in a closed circuit, and the water of the engine 2 in FIG. It supplies fresh water cooling liquid to a jacket.

The supply pipe 11 of FIG. 3 is inserted and connected to the discharge pipe 10f of the first water pump 10 of FIG. The supply pipe 11 extends upward in the upper case 3 and communicates with the water jacket (not shown). Therefore, the fresh water cooling liquid (arrow A) discharged by the first water pump 10 is supplied to the water jacket (not shown) through the supply pipe 11.

Reference numeral 12 denotes a first recovery pipe, the upper part of which communicates with the water jacket (not shown) and extends downward in the upper case 3. The lower portion of the first recovery pipe 12 is bent and is connected to the connecting pipe 13 of FIG. 2, and the tank portion of one radiator 8A is connected.
It communicates with 8b. The one radiator 8A is a connecting pipe.
Via 14 is connected in series to the other radiator 8B. Therefore, the fresh water cooling liquid A has two radiators 8A, 8
When passing through the large number of pipes of the cooling unit 8a in B,
It is cooled, as described below.

The other radiator 8B communicates with the second recovery pipe 16 in FIG. 3 via the connecting pipe 15. This second recovery pipe 16
Extends upward in the lower case 4 and the upper case 3 and is connected to the suction pipe 10e of the first water pump pump 10. Therefore, the fresh water cooling liquid A cooled by the radiators 8A and 8B is sucked into the first water pump 10.

Next, details of the radiators 8A and 8B shown in FIG. 2 will be described. The radiators 8A and 8B are provided symmetrically to each other. A bracket 8d is fixed to the tank portion 8b and fixed to the lower case 4 with a bolt (not shown). A press-fitting collar 31 is interposed between the lower case 4 and the connecting pipes 13 and 15. Therefore, radiator 8A, 8B
Is supported by the lower case 4 by the bracket 8d and the press-fitting collar 31. Incidentally, 32 is a joint.

Lower case 4 between the above two radiators 8A and 8B
A passage 33 is formed inside. The upper portion of this passage 33 communicates with the exhaust pipe 34 of FIG. 3, and guides the exhaust gas of the engine 2 of FIG. 1 into the propulsion device 6 as is well known. That is, the outboard motor 1 exhausts the exhaust gas C into the water behind the propeller 6a.

The second cooling device takes in external water such as seawater sucked from the intake 7 (FIG. 1) by the second water pump 20 shown in FIG. This is a well-known cooling device that is supplied to the outer periphery to cool the exhaust pipe 34, the muffler 35, the exhaust gas C, and the like. The external water B that has cooled the exhaust gas C is discharged together with the exhaust gas C behind the propeller 6a in FIG. Since the second cooling device is not necessarily provided, detailed description thereof will be omitted. Of course, when the second cooling device is not provided, the exhaust pipe 34 shown in FIG. 3 and the like are also cooled by the first cooling device.

In the above structure, the boat (not shown) is indicated by the arrow D in FIG.
The seawater that hits the front part of the lower case 4 splashes with the water as it travels forward in this direction.
Since it hits 4b, the seawater is bathed above the cavitation plate 4a on the side of the lower case 4. Since the radiators 8A and 8B are located above the cavitation plate 4a and are provided laterally outside the lower case 4, the radiators 8A and 8B are also cooled by being bathed in the seawater. . Therefore, the fresh water cooling liquid A of FIG. 3 is cooled through the radiators 8A and 8B.

Here, in this invention, the radiators 8A and 8B are provided so as to be exposed to the outside of the lower case 4 laterally. Therefore, it is not necessary to separately provide a passage for introducing the seawater that cools the radiators 8A and 8B, so that the structure of the outboard motor 1 does not become complicated. Therefore, for example, as shown in FIG.
Since the exhaust passage 33 can be formed between the two radiators 8A and 8B, the exhaust gas can be guided to the propulsion device 6 of FIG. 1 to be exhausted underwater.

In addition, as described above, the radiator 8A, 8B is attached to the main body case 5
This radiator 8 is installed on both left and right sides outside the
The lower surface side 8c of the A and 8B may be provided with the cavitation plate 4a so as to face each other. In other words, unlike the past, radiator 8
It is not necessary to form notches for guiding seawater to A and 8B.
Therefore, the cavitation can be sufficiently prevented, and the seawater that causes a strong swirling flow due to the high-speed rotation of the propeller 6a abuts the cavitation plate 4a, so the thin-walled radiators 8A and 8B are used. Can protect from seawater.

By the way, when the boat is not sailing in Neutral,
The radiator 8A, 8B cannot be cooled by the above dynamic pressure. On the other hand, the water surface rises to the water surface Wa at the time of mooring due to the weight of the boat, so that the radiators 8A and 8B are submerged.

Here, if the radiator 54 is provided in the outboard motor 50 as in the conventional example of FIG. 7 or 8, heat is stored in the cavity 53, and the cooling effect of the radiator 54 is significantly reduced. On the other hand, in this invention, since the radiators 8A and 8B shown in FIG. 1 are provided outside the outboard motor 1, the radiators 8A and 8B are cooled by a large amount of seawater.

Further, foreign matter such as algae may be attached to the surfaces of many pipes and cooling fins in the cooling units 8a of the radiators 8A and 8B, which may be stacked, resulting in a decrease in cooling efficiency. is there. Here, unlike the prior art, since the radiators 8A and 8B are exposed to the outside in the present invention, cleaning of the foreign matter is facilitated. That is, maintenance of the radiators 8A and 8B becomes easy.

FIG. 6 shows a second embodiment.

In FIG. 6, in this embodiment, radiators 8A and 8B are provided in parallel. A connecting pipe 13 connected to the upstream side of the radiator 8A, 8B and a connecting pipe connected to the downstream side
15 is sandwiched between a lower case 4 and an upper case (not shown) via a grommet seal member 36. The pair of connecting pipes 13 are joined together on the upstream side and communicate with the first recovery pipe 12 (Fig. 3). On the other hand, the pair of connecting pipes 15 merge at the downstream side and communicate with the second recovery pipe 16 (FIG. 3). In addition,
In this embodiment, some of the radiators 8A and 8B project outward from the cavitation plate 4a, but most of them face the cavitation plate 4a.

According to this embodiment, since the connecting pipes 13 and 15 are sandwiched between the lower case 4 and the upper case, the connecting pipes 13 and 15 can be easily piped. It should be noted that some seawater or the like enters the lower case 4 through the seal member 36 of the grommet, but since the outside water originally enters the space S in the lower case 4, there is no problem. Other configurations are the same as those of the first embodiment, and the same portions or corresponding portions will be denoted by the same reference numerals and the description thereof will be omitted.

[Effect of device]

As described above, according to the present invention, since the radiator is arranged outside the main body case, it is not necessary to provide a special passage for taking in seawater, and it is necessary to form a notch in the cavitation plate. Nor. Therefore, without complicating the overall structure of the outboard motor, and
This allows the cavitation plate to fully exhibit the effect of preventing cavitation, and also to prevent the radiator from being directly exposed to the seawater that causes a strong swirling flow, and to sufficiently protect the thin wall radiator with the cavitation plate. On the other hand, the radiator can be sufficiently bathed with seawater to efficiently cool the cooling liquid in the radiator. Further, since the radiator is provided outside the main body case, the maintenance including the removal of foreign matter such as algae adhering to the surface of the cooling fin is very easy, and the cooling efficiency can be kept high at all times. Play.

[Brief description of drawings]

FIG. 1 is a side view of an outboard motor showing a first embodiment of the present invention, FIG. 2 is a plan view of a lower case on a split surface, and FIG.
FIG. 4 is a vertical sectional view of an outboard motor showing a first cooling device, FIG. 4 is a vertical sectional view of a first water pump, FIG. 5 is a plan view of a first water pump, and FIG. FIG. 7 is a plan view of a lower case on a dividing surface showing the embodiment of FIG. 7, FIG. 7 is a partial vertical sectional view of a conventional example, and FIG. DESCRIPTION OF SYMBOLS 1 ... Outboard motor, 2 ... Engine, 5 ... Main body case, 4a ... Cabin plate, 8A, 8B ... Radiator, 8c ... Radiator lower surface side, 10 ... (First) water pump, 33 ...
(Exhaust gas) passage, A ... (fresh water) cooling liquid, C ... exhaust gas.

Claims (2)

[Scope of utility model registration request] 1. An outboard motor having a cooling device in which a water pump for supplying a cooling liquid to a water jacket of an engine and a radiator for cooling the cooling liquid returning from the water jacket are arranged in a closed circuit. The radiator is a splash plate and a lower portion of the splash plate, which are provided at positions near the rear of the left and right outer sides of the main body case of the outboard motor and project laterally from just below the upper and lower split surfaces of the main body case. An outboard motor, which is disposed between the cavitation plate arranged in the above and is covered with a lower surface side of the radiator facing the cavitation plate. 2. The outboard motor according to claim 1, wherein an exhaust gas passage is formed inside the main body case between the radiators on the left and right sides.