JPS60222394A - Air intake divice with air guide plate for outboard motor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION PRIOR ART AND PROBLEMS THEREOF Outboard motors are equipped with covers designed to reduce the ingress of water into the cylinders of the motor.

Possible sources of water include rain, water splash, and raging waves.

The cover also helps reduce sound, as it is usually lined with sound-absorbing material.

Even if water does not get into the engine, it can still cause problems if it reaches the engine. This causes poor spark ignition and leaves corrosive deposits as the brine evaporates.

Add water'F1. Everyone agrees that it would be best not to have it. The air intake had a vane and a deflector arranged inside the opening. Even under normal conditions, water will still infiltrate. This problem becomes more pronounced in large engines that require large amounts of combustion air. This motor requires a larger opening in the cover, making water and noise more of a problem.

The present invention seeks to overcome these problems.

The following prior art is noteworthy: U.S. Patent No. 798,470, U.S. Patent No. 3,195,530
No. 6,610,198, No. 2,815,742, No. 3,204,619, No. 4,166.756,
2.839,042, 3.557.902, 4.326,600, 2,914,133, 712,416 and 4.379.702.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air suction device for an outboard motor that includes a motor that drives a propeller. The engine cover consists of a lower pan-shaped cover and an upper dome-shaped cover that is sealingly connected to the lower pan-shaped cover. A combustion air opening is provided in the upper part of the two-part cover.

The baffle plate cooperates with the inside of the upper cover to form a chamber. A combustion air opening communicates with this chamber, and a partition between the opening and the chamber forces the incoming air upwardly into the kernel chamber. The baffle plate cooperates with the manure cover to form a downward duct that directs air away from the engine and toward the lower cover. Combustion air from the engine is drawn upward through the partial force of the lower pan, and water that enters through the opening and is entrained by the air moving down the duct accumulates on the lower cover.

The invention further includes a duct near the back of the cover, while air enters the engine near the front of said cover.

Another feature is that in this device, an air hole is provided on the back of the cover, and a hole is also provided near the upper rear screen corner of the cover, and each of the holes has a partition on the inside of the hole. , while allowing the air to flow upwards and reach the chamber;
The partition plate is designed to return the water that has accumulated there to the outside.

Yet another feature is that such devices include means for draining water that collects on the lower cover to the outside of the cover.

The invention is not limited to the detailed construction and arrangement of components described in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being carried out and carried out in various ways.
It is possible to do so.

For example, although the baffle plate is shown as being fixed to the cover, it could also be disposed on the engine and shaped to cooperate closely with the inside of the cover. The terminology used herein is for purposes of explanation only and should not be considered limiting.

The example outboard motor has a propeller 1 through a normal drive shaft and transmission device.
4 has a power end 12 with a cover assembly 10 containing a motor for driving the motor.

The spark plug 16 is on the back of the engine and the blower 18 is on the front of the engine. This is the normal arrangement.

The cover assembly 10 consists of a lower pan-shaped cover 20 and an upper dome-shaped cover 22, which are hermetically joined at a seam 24.

The upper cover includes an internal baffle plate 26 connected to the inner side of the upper cover 22 and coupled to the inner side in a sealing manner. As mentioned above, the baffle plate can be fixed to the motor by means of suitable brackets or the like, and in this case also can be provided with all the features of the example shown in conjunction with the cover.

The inner guide plate 26 cooperates with the inside of the top cover to form an upper chamber, which may be referred to as a side chamber 28, at both corners of the upper back of the cover. These side chambers 28 adjoin one on a central sloping partition plate 60 which together with both sides of the baffle plate forms a space for accommodating the flywheel of the motor. A side air opening 62 opens into this chamber 28 . opening 62
11'j: It has a plurality of vertical air holes 64, and just inside the air holes there is an air deflection partition 66 that projects inward in two directions. The partition projects upward from the opening 62, and is formed by the downwardly projecting portion 40 of the baffle plate 26 and the back surface 42 of the cover 22 so that the air flowing into the opening is directed downward by the dome-shaped cover. Push up under the dome-shaped cover before flowing into the duct.

The cover 22 also includes a back opening 44 just above the duct 68. Air entering this opening must go around the chimney portion 46 of the cover and rise to the insert 52.
must pass through the opening 48 in the partition 50, which is part of the partition 50. The partition 50 also has a central opening 54;
Air entering the back opening 44 and opening 48 can pass downwardly through the chimney 46 and into the duct 68.

In this way, air entering each side opening is deflected upwardly into the side chamber between the baffle plate and the cover.

This air then flows down into a duct 68 which continues down to the back of the cover. Air entering the upper back opening 44 provided in the cover passes through the opening 4 surrounding the chimney 46.
8 and then through the opening 54 into the chimney 46
It is diverted into the space between the baffle and the cover and enters the downwardly directed duct 68. A duct 68 directs air downward between the spark plugs 16.16 on either side of the engine. A duct 68 opens into the lower pan cover 20 at the back of the cover assembly. next,
The combustion air rises to the bottom of the cover and enters the carburetor 18, which is connected to the engine cylinder.

Air entering the back or side openings must flow upwards to reach the central chamber between the baffle and the cover. The ox riding on the wind, the water blown up by the wind, becomes thrown out by changing direction. In the case of side openings, the water thus precipitated then passes through the partition 6.
6 back out of the opening 62. Water entering the back opening must rise up the plate 50 and then be redirected downward into the chimney. Therefore, water tends to precipitate on the outside of the chimney and then backs out through the opening. Once on the indoor side between the cover and the baffle, the air is forced down along the back of the cover and away from the spark plug and the engine itself. Therefore, the incoming water does not wet the outside of the engine. The water changes direction at the bottom of the duct 38 and flows forward, and the airborne water tends to be thrown out of the airflow again and collects on the bottom surface 56 of the lower pan-shaped cover 20. Air flows forward,
It turns upwards (releasing more water) and passes into the vaporizer 18, where it flows into the engine. All this water collects at the bottom of the pan-like cover and can be pumped out by means of a pump 58 operated by the inlet or by a suitable one-way or check valve arrangement.

The inner surface of the dome-shaped cover 22 is made of an i-proof material such as foam.
or lined with sound-absorbing material. Labyrinths or convoluted airflow passages are also suitable to provide convolution to the hepatic transmission. Therefore, the sound volume outside the motor cover is reduced compared to a motor with a normal opening without such a baffle plate arrangement. Which device significantly reduces the volume.

By means of the baffle plate, water that is carried by the air current or is initially drawn into the opening toward the cover is first moved upwards even before reaching the inside of the cover. The water that passes through this redirection is redirected to flow back down to the bottom of the cover assembly and deposit, while the air continues to travel forward and then rise into the aerator. At each turn, water flows down and this water can then drain out of the cover.

[Brief explanation of the drawing]

Figure 1 is a side view of the outboard motor somewhat schematically showing the side air intake of the l-t1 motor cover and the baffle plate device inside the cover. FIG. 6 is a partially cutaway longitudinal cross-sectional view showing various features. FIG. 6 is a rear view of the upper part of the power head of the outboard motor, with the portion cut away and the other portion showing the air flow to the engine with dotted lines. FIG. 4 is a horizontal sectional view taken along line 4-4 in FIG. 6. FIG. 5 is a horizontal sectional view taken along line 5-5 in FIG. 10 is an enlarged perspective view of an internal baffle plate device including a cover and an inlet, with the cover shown in chain lines to show the relationship between each part and the air flow path. 10...Cover assembly 12...・Power head 14...Propeller 16...Spark plug 18...Air blower 20...Lower pan-shaped cover 22...Upper dome-shaped cover 24...Joint 26...Air guide plate 28... Side chamber 60... Partition plate 32... Air opening 64... Air hole 66... Air deflecting partition 68... Duct 40... Portion 42 of the baffle plate projecting downward... - Back side 44 of the cover...back opening 46...chimney-shaped part 48 of the cover...opening 50...partition 52...insert 54...center opening 56...bottom surface 58 of the lower cover...・Pump. Patent applicant: Outboard Merlin Corporation (5 others)

Claims (1)

[Scope of Claims] 1. An air intake device for an outboard motor equipped with a motor that drives a propeller, which comprises a lower pan-shaped cover and an upper dome-shaped cover that is sealed in a sealed manner with the lower cover. a cover of the engine; a combustion air opening extending to an upper portion of the top cover; and a baffle plate cooperating with the inside of the top cover to form a chamber communicating with the opening;
a partition between the opening and the chamber so that air entering the opening moves upward as it enters the chamber, and the baffle plate cooperates with the upper cover to move the engine. The lower cover forms a downwardly directed duct which directs air in one direction so that the combustion air of the engine is drawn up from the lower pan section and thus enters the opening and into the air moving through the duct. An air intake device for an outboard motor, wherein the filled water is deposited on the lower cover. 2. In the air intake device for an outboard motor according to claim 1, the partition is arranged so that when water entering the opening adheres to the partition, the water returns to the outside of the cover. Air intake device for the outboard motor installed. 6. In the air intake device for an outboard motor according to claim 2, the duct is located near the back of the cover, and air enters the engine near the front of the cover. Air intake device. 4. In the air intake device for an outboard motor according to claim 6, the @recording port is located at the back of the cover. 5. In the air intake device for an outboard motor as set forth in claim 4, there are also holes near each upper rear corner of the cover, and all of these holes communicate with the chamber and the duct. Air intake device for the outside engine. 6. In the air intake device for an outboard motor as set forth in claim 2, each of the upper rear outer corners of the upper cover is provided with a hole as described above and, in combination with the hole, a partition that communicates with the chamber. The duct continues downward from the chamber along the inside back of the upper cover, and the duct is connected to the outboard motor that draws combustion air from the inside front of the engine. 2. In the air intake device for an outboard motor as set forth in claim 1, water entering the chamber is directed downwardly to the lower cover by the duct, and the device An air suction device for an outboard motor, comprising means for discharging water collected in the lower cover to the outside of the cover.