JP3858558B2 - Hydraulic detection structure of outboard motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hydraulic pressure detection structure for an outboard motor.
[0002]
[Prior art]
In a 4-cycle engine mounted on an outboard motor or the like, oil in an oil pan is usually pumped up by an oil pump and pumped to various parts of the engine through an oil passage. Since sufficient lubrication performance cannot be exhibited when the oil pressure in the oil passage decreases, a sensor device such as an oil pressure switch is provided in the middle of the oil passage so that the decrease in oil pressure can be transmitted to the user.
[0003]
Conventionally, the sensor device is provided in a main gallery that is an oil passage formed in a cylinder block of an engine.
[0004]
[Problems to be solved by the invention]
In the case of an engine having the above-described configuration, it is common to remove a sensor device and connect a measuring instrument to a mounting hole of the sensor device before checking the hydraulic pressure before shipment or during maintenance.
[0005]
However, in the case of an engine in which the sensor device is attached to the main gallery formed in the cylinder block, since the mounting hole of the sensor device is located on the side surface of the engine, it is difficult to check the hydraulic pressure from the ship.
[0006]
In addition, if the sensor device is installed at a position close to the air intake port disposed at the rear part of the outboard motor, seawater entering from the air intake port may be applied to the sensor device and reduce its function.
[0007]
The present invention has been made in consideration of the above-described circumstances, and an object thereof is to provide a hydraulic pressure detection structure for an outboard motor that prevents a decrease in the function of a hydraulic pressure sensor device and improves the workability of a hydraulic pressure check. And
[0008]
[Means for Solving the Problems]
In order to solve the above-described problem, an outboard motor hydraulic pressure detection structure according to the present invention has a crankcase, a cylinder block, and a cylinder head arranged in this order from the front as described in claim 1. In the engine of the outboard motor in which the crankshaft is arranged substantially vertically inside the mating surface of the cylinder block, the engine is covered with an engine cover that can be divided into upper and lower parts composed of an upper cover and a lower cover, and the upper rear part of the upper cover The lower cover is composed of a pair of left and right side covers divided into left and right sides and a front panel arranged on the front, while a main gallery for guiding lubricating oil to each part of the engine is formed on the front of the crankcase. It formed so as to extend in the vertical direction, for detecting the oil pressure in the main gallery Sen Device is attached to the main gallery a front surface of the above the split face of the upper cover and lower cover of the crankcase, the oil filter for filtering lubricating oil of a position deviated in the width direction from the main gallery of the crankcase It is a front side portion, and is disposed in the oil passage below the split surfaces of the upper cover and the lower cover .
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0013]
FIG. 1 is a left side view of an outboard motor to which the present invention is applied. As shown in FIG. 1, the outboard motor 1 includes an engine holder 2, and an engine 3 is installed above the engine holder 2. The engine 3 is a vertical type engine in which the crankshaft 4 is disposed substantially vertically. An oil pan 5 is disposed below the engine holder 2 and, for example, a bracket 6 is attached to the engine holder 2, and the outboard motor 1 is attached to a transom of a hull (not shown) via the bracket 6. .
[0014]
Further, the engine 3, the engine holder 2, and the oil pan 5 around the outboard motor 1 are covered with an engine cover 7. The engine cover 7 is divided into an upper cover 8 that detachably covers the upper part of the engine 3 and a lower cover 9 that covers the lower part of the engine 3, the engine holder 2 and the oil pan 5. Further, the lower cover 9 includes a pair of left and right side covers 10 divided into left and right sides and a front panel 11 disposed on the front surface, and is fixed to the outboard motor 1 side. An intake port 12 is formed in the upper rear portion of the upper cover 8.
[0015]
A drive shaft housing 13 is installed below the oil pan 5. A drive shaft 14 is disposed substantially vertically in the engine holder 2, the oil pan 5, and the drive shaft housing 13, and an upper end portion thereof is connected to a lower end portion of the crankshaft 4. The drive shaft 14 extends downward in the drive shaft housing 13 and is configured to drive the propeller 18 via a bevel gear 16 and a propeller shaft 17 in a gear case 15 provided at the lower portion of the drive shaft housing 13.
[0016]
FIG. 2 is an enlarged side view of the upper half portion of the outboard motor 1 shown in FIG. 1, and a part thereof is shown in cross section. As shown in FIGS. 1 and 2, the engine 3 mounted on the outboard motor 1 is a water-cooled cycle three-cylinder engine configured by combining, for example, a crankcase 19, a cylinder block 20, a cylinder head 21, and the like.
[0017]
A cylinder block 20 is arranged at the foremost part of the engine 3, behind the crankcase 19 arranged on the leftmost side in FIGS. 1 and 2 (right side). A cylinder head 21 is disposed behind the cylinder block 20.
[0018]
As described above, the crankshaft 4 is disposed substantially vertically inside the mating surface of the crankcase 19 and the cylinder block 20. Further, a valve operating device (not shown) is provided in the cylinder head 21, and a camshaft 22 for operating the valve operating device is disposed in parallel to the crankshaft 4 at the rear portion of the cylinder head 21.
[0019]
Further, a cam chain chamber 23 is formed in a space between the engine holder 2 and the lower surface of the engine 3, and the rotation of the crankshaft 4 is transmitted to the camshaft 22 in the camchain chamber 23 to rotate the camshaft 22. A camshaft drive mechanism 24 to be driven is provided. The camshaft drive mechanism 24 is, for example, a chain drive system, and includes a cam drive sprocket 25 provided on a portion of the crankshaft 4 that protrudes below the engine 3, and a camshaft 22 that also protrudes below the engine 3. A cam driven sprocket 26 provided at the lower end and a timing chain 27 wound around the sprockets 25 and 26 are formed.
[0020]
By the way, the outboard motor 1 is provided with a lubricating device for lubricating the inside of the engine 3. This lubricating device sucks up the lubricating oil stored in the oil pan 5 by the oil pump 28 and supplies it to each part of the engine 3. The oil pump 28 is provided in the engine holder 2, and is disposed immediately below the camshaft 22 in the cylinder head 21 at the rearmost part on the lower surface side of the engine holder 2.
[0021]
The oil pump 28 is, for example, a general trochoid pump, and a pump drive shaft 29 that drives the oil pump 28 is coupled to the camshaft 22 so as to be integrally rotatable and separable. That is, when the engine 3 operates and the camshaft 22 rotates, the oil pump 28 is driven.
[0022]
An oil strainer 30 for filtering the lubricating oil is disposed near the bottom surface of the oil pan 5, and an oil supply pipe 31 extending upward from the oil strainer 30 is connected to an oil suction port (not shown) of the oil pump 28. The oil strainer 30 is supported by the stay 32 on the lower surface of the engine holder 2.
[0023]
From an oil discharge port (not shown) of the oil pump 28, an oil discharge passage 33 extends substantially horizontally rearward in the engine holder 2. For example, the oil discharge passage 33 extends upward below the cylinder block 20 and is oiled on the upper surface of the engine holder 2. An outlet 34 is formed.
[0024]
On the other hand, the crankcase 19 is provided with a main gallery 35 that is an oil passage. The main gallery 35 extends, for example, in the vertical direction in the crankcase 19 in front of the crankshaft 4, and the lower end of the main gallery 35 has an oil communication path 36 formed substantially horizontally below the crankcase 19 and the cylinder block 20. To the oil outlet 34 on the upper surface of the engine holder 2 described above. Further, a plurality of oil passages 37 are extended from the main gallery 35 toward the bearing portion 38 of the crankshaft 4 formed in the crankcase 19.
[0025]
An oil filter 39 is interposed between the main gallery 35 and the oil communication path 36, and the lubricating oil guided through the oil communication path 36 is once guided to the oil filter 39 and filtered, and then the main gallery 35. Led to. The oil filter 39 is disposed on the front surface of the crankcase 19.
[0026]
FIG. 3 is a front view of the engine 3 and shows the front surface of the crankcase 19. FIG. 4 is a front view of a single crankcase 19 with the auxiliary devices removed. FIG. 5 is a cross-sectional view taken along line VV in FIG.
[0027]
As shown in FIGS. 2 to 5, the main gallery 35 is formed integrally with the crankcase 19 on the front surface of the crankcase 19. The main gallery 35 is provided with an oil pressure switch 40 which is a sensor device that responds to the oil pressure of the lubricating oil. The oil pressure switch 40 is activated when the flow rate of the lubricating oil in the main gallery 35 decreases and the hydraulic pressure drops below a predetermined value due to a leakage of lubricating oil or a decrease in the function of the oil pump 28. A detection signal is issued to a warning means described later.
[0028]
The oil pressure switch 40 has a mounting boss 41 formed on the main gallery 35 on the front surface of the crankcase 19 and above the split surface 42 between the upper cover 8 and the lower cover 9 of the engine cover 7.
[0029]
FIG. 6 is a front view of the outboard motor 1. As shown in FIG. 6, the front panel 11 constituting the lower cover 9 is provided with, for example, an LED lamp 43 serving as the warning means, and is lit when the hydraulic pressure in the main gallery 35 is lowered to inform the user of an abnormality in the lubricating device. To communicate. Note that a buzzer (not shown) may be used instead of the LED lamp 43, and the warning means may be arranged not on the front panel 11 of the engine cover 7 but on a marine vessel maneuvering console (not shown).
[0030]
Next, the operation of this embodiment will be described.
[0031]
A main gallery 35 that is an oil passage is formed on the front surface of the crankcase 19, and an oil pressure switch 40 that is a sensor device is provided on the main gallery 35. This makes it easy to check the hydraulic pressure from the ship. Further, since it is also moved away from the air inlet 12 formed in the engine cover 7, seawater that has entered from the air inlet 12 is less likely to be applied to the oil pressure switch 40, and malfunction due to corrosion or the like can be prevented.
[0032]
In addition, since the oil pressure switch 40 is disposed above the split surface 42 between the upper cover 8 and the lower cover 9 of the engine cover 7, the oil pressure switch 40 can be operated even if seawater entering from the intake port 12 accumulates in the lower cover 9. Since the seawater pool is not immersed, the oil pressure switch 40 can be prevented from being corroded and the upper cover 8 is detachable, so that the hydraulic pressure check operation is further facilitated.
[0033]
The oil filter 39 can be disposed on the front surface of the crankcase 19 by forming the main gallery 35 on the front surface of the crankcase 19. As a result, the replacement work from the ship becomes easier as compared with the case where the engine 3 is conventionally disposed at the lower side of the engine 3.
[0034]
【The invention's effect】
As described above, according to the hydraulic pressure detection structure for an outboard motor according to the present invention, the crankcase, the cylinder block, and the cylinder head are arranged in this order from the front, and the inside of the mating surface between the crankcase and the cylinder block. In an outboard engine in which the crankshaft is arranged substantially vertically, the engine is covered with an engine cover that can be divided into upper and lower parts composed of an upper cover and a lower cover, an intake port is formed at the upper rear portion of the upper cover, and a lower cover is formed. A main gallery for guiding lubricating oil to each part of the engine is formed so as to extend in the vertical direction on the front surface of the crankcase , and comprises a pair of left and right side covers divided into left and right and a front panel arranged on the front surface. before the sensor device for detecting the oil pressure in main gallery of the crankcase It is attached to the main gallery above the split surface of the upper cover and the lower cover, and an oil filter for filtering lubricating oil is a front side portion at a position removed from the main gallery of the crankcase in the width direction, Since it is arranged in the oil passage below the split surface of the upper cover and the lower cover, it is easier to check the hydraulic pressure than in the prior art, and it is possible to prevent the sensor device from deteriorating in function.
[0035]
In addition, the engine is covered with an engine cover that can be divided into upper and lower parts consisting of an upper cover and a lower cover, and an intake port is formed in the upper rear part of the upper cover. together constituting between been front panel, for which a front surface of the crankcase by placing the sensor devices on above the main gallery from the split face of the upper cover and lower cover, with access to the sensor device is facilitated The maintainability of the hydraulic pressure check is improved and the function of the sensor device can be maintained high.
[0036]
In addition, since the main gallery is formed to extend in the vertical direction on the front surface of the crankcase, and the sensor device is attached to the main gallery , maintainability of the hydraulic check is further improved, and the function of the sensor device is reduced. Is prevented.
[0037]
In addition, since the oil filter for filtering the lubricating oil is disposed in the oil passage on the front side of the front side of the crankcase where it is separated in the width direction and below the split surface of the upper cover and the lower cover , replacement work is performed. Improves.
[Brief description of the drawings]
FIG. 1 is a left side view of an outboard motor showing an embodiment of a hydraulic pressure detection structure for an outboard motor according to the present invention.
FIG. 2 is an enlarged side view of an upper half portion of the outboard motor shown in FIG.
FIG. 3 is a front view of the engine.
FIG. 4 is a front view of a single crankcase from which auxiliary devices are removed.
5 is a cross-sectional view taken along line VV in FIG.
FIG. 6 is a front view of the outboard motor.
[Explanation of symbols]
1 Outboard 3 Engine 4 Crankshaft 5 Oil pan 7 Engine cover 19 Crankcase 20 Cylinder block 21 Cylinder head 28 Oil pump 35 Main gallery (oil passage)
39 Oil filter 40 Oil pressure switch (sensor device)
42 Split face of engine cover

Claims (1)

In an outboard engine in which a crankcase, a cylinder block and a cylinder head are arranged in this order from the front, and a crankshaft is arranged substantially vertically inside the mating surface of the crankcase and the cylinder block, the engine is connected to the upper cover. The upper cover is covered with an engine cover that can be divided into upper and lower parts, an air inlet is formed in the upper rear part of the upper cover, and the lower cover is composed of a pair of left and right side covers divided into left and right and a front panel arranged on the front On the other hand, a main gallery for guiding lubricating oil to each part of the engine is formed to extend in the vertical direction on the front surface of the crankcase, and a sensor device for detecting the hydraulic pressure in the main gallery is provided on the front surface of the crankcase and the upper Main above the split surface of the cover and lower cover The oil filter that filters the lubricating oil is mounted on the gallery and is disposed in the oil passage on the front side of the crankcase main gallery at a position removed in the width direction and below the split surfaces of the upper cover and the lower cover. hydraulic sensing structure of the outboard motor, characterized in that the.

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