JP2652367B2 - Lubrication device for 4-cycle engine 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 lubricating device for a four-stroke engine marine propulsion device.

[0002]

2. Description of the Related Art Conventionally, as a lubricating device for a four-stroke engine marine propulsion device, an oil reservoir for receiving and storing lubricating oil after lubricating a required portion of a crank chamber and a cam chamber of an internal combustion engine is provided below an engine body. And a lubricating device that supplies lubricating oil in the oil reservoir to a lubrication-requiring portion of the internal combustion engine by a suction pump. In this lubricating device, the oil reservoir communicates with the crank chamber and the cam chamber through an oil return path that is always open, and receives the lubricating oil after lubricating the necessary parts of the internal combustion engine by natural fall with almost no resistance. Recover, store this, then recirculate,
Thus, the lubricating oil is circulated through the circulating oil passage and reused.

[0003] In a four-stroke engine marine propulsion system, there are many usage states in which high-power operation is continued for a long time on a wide sea or the like, and as a result, the oil temperature of the lubricating oil is increased, and as a result, the lubricating oil It is easy to cause early deterioration. Therefore,
In order to cool the lubricating oil, two engine cooling water passages are provided in the space between the exhaust pipe and the oil reservoir, with the forward path adjacent to the oil reservoir and the return path adjacent to the exhaust pipe. That was being done. (For example, Jikken 47-27
No. 113) Also, the oil reservoir is connected to the outer cylinder part.
Formed in a substantially triple cylinder structure consisting of an intermediate cylinder part and an inner cylinder part, an oil storage part is formed by an outer cylinder part, an intermediate cylinder part and a middle bottom part, It has been practiced to form a drain passage for cooling water and to use the inner cylinder as an exhaust passage. (See, for example, JP-A-60-19904)

[0004]

The output and performance of a four-stroke engine marine propulsion system have been further enhanced, and the oil temperature rise and deterioration of the lubricating oil have been required only by cooling the oil reservoir with water as in the prior art. Can no longer be prevented. SUMMARY OF THE INVENTION It is an object of the present invention to provide a lubricating device for a four-stroke engine marine propulsion system, in which lubricating oil is cooled in a portion other than the oil reservoir to prevent the lubricating oil temperature from rising and deteriorating.

[0005]

According to the present invention, a suction port of a suction pump is opened in an oil reservoir, and lubricating oil in the oil reservoir is lubricated to an internal combustion engine through an oil feed passage by the suction pump. The lubricating oil after lubricating the necessary parts of the internal combustion engine flows into the oil reservoir via the return oil passage, and circulates the lubricating oil through the lubricating oil passage including the oil supply passage and the return oil passage. In a lubricating device for a four-stroke engine marine propulsion system, an oil filter is interposed in the lubricating oil passage.
And form a vertical exhaust passage inside the cylinder block.
An oil filter is installed on the
Forming a socket, the external water taken in from inlet water supplied to the water jacket by the water pump, the suction pump
A first configuration is such that a part of an oil supply passage between the oil filter and the oil filter is formed as a cooling unit disposed close to the water jacket, and the cooling unit cools the lubricating oil.
The present invention, in the first configuration is to utilize the engine cooling water jacket as a water jacket and the second configuration.

[0006]

1 to 6 show a first embodiment of the present invention. As shown in FIG. 1, an outboard motor 10 as an example of a four-cycle engine ship has a clamp bracket 12 attached to a hull 11, a swivel bracket 14 supported on the clamp bracket 12 via a tilt shaft 13, and a swivel. A propulsion casing 15 is supported on the bracket 14 via a steered shaft (not shown) so as to be steerable. A four-cycle internal combustion engine 17 is mounted on the upper part of the propulsion casing 15 via a plate-shaped intermediate member 16. 10A is a cowling. The output of the internal combustion engine 17 is supplied to a propeller shaft via a drive shaft 18 suspended in a propulsion casing 15 and a forward / reverse switching gear train 19.
The propeller 21 is allowed to rotate forward or backward.

[0007] As shown in FIGS.
A cycle four-cylinder internal combustion engine with a cylinder block 22;
Crank case 23, cylinder head 24 and head cover
25 forms the engine body. Cylinder block
The 22 has four cylinders, each with a piston.
26 are arranged so as to be able to reciprocate in the horizontal direction. The space formed by the cylinder block 22 and the cylinder head 24 on the top side of the piston 26 is a combustion chamber. The space formed by the cylinder block 22 and the crankcase 23 on the back side of the piston 26 is a crank chamber 28. In the crank chamber 28, a crankshaft 29 supported by a bearing portion formed at a mating surface between the cylinder block 22 and the crankcase 23 is vertically disposed. An upper end of the drive shaft 18 is provided at a lower end of the crankshaft 29. Are connected. Reference numeral 30 denotes a connecting rod that connects the piston 26 and the crankshaft 29.

The space defined by the cylinder head 24 and the head cover 25 is a cam chamber 31. A cam shaft 32 is placed vertically in the cam chamber 31, and upper and lower ends of the cam shaft 32 are supported by the cylinder head 24. In FIG. 3, 33 is an intake cam, 34 is an exhaust cam, and 35 is a rocker arm. A belt 38 is wound around a driving wheel 36 provided at an end of the crankshaft 29 protruding from the crank chamber 28 and a driven wheel 37 provided at an end of the camshaft 32 protruding from the cam chamber 31. The camshaft 32 is rotated once by two rotations of the crankshaft 29, and an intake valve and an exhaust valve (not shown) are opened and closed.

Since the internal combustion engine 17 constitutes a dry sump lubrication system, an oil receiver 41 is disposed on the intermediate member 16 located below the cylinder block 22 as shown in FIGS. An oil tank 42 is disposed laterally or forward, and a pump device 43 is disposed on a lower side surface of the cylinder block 22. The oil receiver 41 is set in the intermediate member 16 at a position close to the crankshaft 29. An oil return path 44 extending from the crank chamber 28 to the oil receiver 41 is formed in the cylinder block 22, and an oil return path 45 extending from the cam chamber 31 to the oil receiver 41 is formed in the cylinder head 24 and the cylinder block 22. The return paths 44 and 45 meet at the upper part of the oil receiver 41 and communicate with the oil receiver 41 via a filtration / defoaming screen 46 sandwiched between the cylinder block 22 and the intermediate member 16. That is, the lubricating oil after lubricating the respective lubrication required parts of the engine flows down the oil return paths 44 and 45 by natural fall, and collects in the oil receiver 41 via the screen 46.

The oil tank 42 has an oil inflow path 47 and an oil outflow path 48, and a screen located at an intermediate portion in the tank above the suction port 48A of the oil outflow path 48.
It has 49. The discharge port 47A of the oil inflow path 47 is set so as to protrude above the oil level in the tank, and is spaced above the suction port 48A.
It is effective for gas-liquid separation of the lubricating oil flowing into 42. Further, the screen 49 is for filtering and defoaming, and prevents foreign substances and bubbles from flowing into the oil outlet path 48 toward the suction port side. In addition,
The oil tank 42 has an oil inlet cap and an oil level gauge 50. Further, the oil tank 42 is provided with an air bleed pipe 51 for releasing the air in the tank to the upper space of the cam chamber 31 when the oil level in the tank or the tank internal pressure increases, and the air bleed pipe 51 is connected to the oil tank 42. Oil tank 42 by tilting the propulsion casing 15
Check valve to prevent oil leakage when the machine falls down
52 are provided. (See FIG. 2 (b)). The valve opening pressure of the check valve 52 is set by a spring.

The pump device 43 is, as shown in FIGS.
Installed around the lower end of the crankshaft 29, the oil feed pump 53
And the lubricating pump 54 are provided in a two-stage state in the pump body 43A, and the pump shaft 55 common to both is driven by the rotational force of the crankshaft 29. That is, a pump shaft drive shaft 56 is coupled to the pump shaft 55, a driven gear 57 is fixed to the pump shaft drive shaft 56, and the driven gear 57 is meshed with a drive gear 58 provided on the crank shaft 29. I have.

As shown in FIG. 4, the oil feed pump 53 has a suction opening 60 in which a suction passage 59 provided in the pump body 43A and the cylinder block 22 is continuous.
The discharge path 61A provided in the pump body 43A communicates with the discharge path 61B provided in the cylinder block 22, the discharge path 61B communicates with the oil inflow path 47 of the oil tank 42, and the rotor 62 fixed to the pump shaft 55 The lubricating oil in the oil receiver 41 is fed by rotation and supplied to the oil tank 42. At this time, a check valve 63 is provided in the discharge path 61A in the pump body 43A, and the outboard motor
The lubricating oil in the oil tank 42 is prevented from flowing back to the oil receiver 41 when the 10 is placed horizontally. The valve opening pressure of the check valve 63 is set by a spring.

As shown in FIG. 5, the lubrication pump 54 connects a suction port 64 provided in the pump body 43A and the cylinder block 22 to the oil outflow passage 48 of the oil tank 42,
The discharge passage 65 provided in the pump body 43A is connected to the cylinder block 22.
The lubricating oil in the oil tank 42 is pressure-fed to the oil passage 66 by the rotation of a rotor 67 fixed to the pump shaft 55 and communicates with an oil passage 66 provided in the cylinder head 24 so that the lubrication of the engine (crank) Shaft 29, camshaft 32, etc.). At this time, a check valve is provided in the discharge passage 65 in the pump body 43A.
68 is provided, and the lubricating oil supplied to the oil supply passage 66
In addition to preventing backflow to the side of 67, the valve closing pressure of the check valve 68 set by a spring allows the outboard motor 10 to be placed sideways with the lubrication pump 54 stopped with the engine stopped. The flow of the lubricating oil in the forward direction from the oil tank 42 to the oil supply path 66 is prevented.

As shown in FIGS. 2 and 3, the oil supply passage 66 is connected to the discharge passage 65 of the lubrication pump 54 located below the cylinder block 22, and from the connection point to the lower end of the pump-side oil supply passage 66A. Oil passage leading to and pump-side oil passage 66A extending upward
And a distribution-side oil supply passage 66B connected to the upper end of the pump-side oil supply passage 66A via an oil filter 69 and extending vertically from the oil filter 69, and further from each part of the distribution-side oil supply passage 66B. It has a branch oil supply passage 66C that branches and extends toward each lubrication required portion of the engine. Bearing and camshaft at upper end of crankshaft
A transfer oil supply passage 66D is arranged between the 32 oil holes 32A. The lubricating oil in the uppermost branch oil supply passage 66C lubricates the crankshaft upper bearing, the camshaft upper bearing, the cam surface and the camshaft lower bearing. Oil passage for pump side to oil filter 69
A relief valve 70 for pressure regulation is provided in communication with 66A, and the relief valve 70 protects the oil filter 69 by releasing the high pressure of the pump-side oil supply passage 66A to the crank chamber 28.

The upper end of the pump-side oil supply passage 66A has a lubricating suction opening 48A opening to the oil tank 42, and a lubrication discharge opening each branch oil supply passage 66C of the oil supply passage 66 opening to a portion requiring lubrication. And is located above the highest oil level of the oil tank 42 under the normal use condition of the oil tank 42. By reducing the amount of lubricating oil retained in the oil receiver 41 and increasing the amount of lubricating oil in the oil tank 42 by that amount, it is possible to prevent poor lubrication during restart after tilting up and down. . For this purpose, it is necessary to enhance the pump performance of the oil feed pump that returns the lubricating oil from the oil receiver 41 to the oil tank 42, rather than the pump performance of the lubricating pump that circulates the lubricating oil from the oil tank 42 to the oil receiver 41. In addition, since the lubricating oil on the oil receiver 41 side contains more air than the oil tank 42 side, it is necessary to further improve the pump performance. For this reason, the rotor thickness (capacity) of the oil supply pump 53 is made larger than the rotor thickness (capacity) of the lubrication pump 54. Oil tank 42 by oil pump 53
The air sent to the tank increases the tank internal pressure, and the air is discharged to the air bleed tube 51 described above.

The outboard motor 10 has a drive shaft as shown in FIG.
A water pump 71 driven by 18 is built in the propulsion casing 15 and is driven in conjunction with the internal combustion engine 17.
Thus, external water (sea water, river water, lake water, etc.) taken in from the water inlet 72 is supplied to the water jacket 74 of the internal combustion engine 17 through the water supply pipe 73, and the internal combustion engine 17 is cooled. The cooling water obtained by water-cooling the engine 17 passes through a thermostat valve 74A,
It is guided from 74B to the drainage channel inside the propulsion casing 15, and then discharged from the boss of the propeller 21 to the outside. Also,
In FIG. 6, reference numeral 75 denotes an exhaust passage. In this embodiment, as shown in FIG. 1, FIG. 2, and FIG. 6, the intermediate portion of the pump-side oil supply passage 66A is disposed around the exhaust passage 75 of the cylinder block 22 and around the combustion chamber of the cylinder head 24. A cooling unit 81 is attached to the outer surface of the water jacket 74 provided in the cooling unit 81 and cools the oil supply passage 66A by cooling water pumped by the water pump 71.

The first operation of the embodiment of the present invention will be described. In the first embodiment, an oil tank 42 for storing the lubricating oil transferred from the oil receiver 41 is provided separately from the oil receiver 41 for receiving the lubricating oil after lubricating the necessary parts of the engine. I did it. Therefore, the oil pan
Although the oil tank 41 is disposed relatively close to the engine main body for simplification of the oil return passages 44 and 45, the oil tank 42 can be arranged separately from the propulsion casing in which the engine main body and the exhaust expansion chamber are arranged. As a result, the temperature rise of the oil tank 42 due to combustion heat and exhaust heat of the engine is suppressed, and an increase in the oil temperature of the lubricating oil stored in the oil tank 42 can be suppressed as much as possible. Further, it is possible to prevent poor lubrication after restarting after tilt up / down.

In the first embodiment of the present invention, external water taken in from a water inlet 72 by a water pump 71 is supplied to a water jacket, and a pump-side oil supply passage, which is a part of a circulation oil passage, is provided. Cooling section with 66A arranged along the water jacket
81 are provided. Therefore, the lubricating oil for lubricating the engine 17 is actively cooled by the cooling unit 81, and the temperature rise and deterioration of the lubricating oil are prevented. Since the cooling unit 81 is disposed in the oil supply passage between the oil filter 69 and the lubrication pump, the temperature of the lubricating oil sent to the oil filter 69 is prevented from rising, and the aging of the rubber seal in the oil filter 69 is prevented. Is prevented.

FIG. 7 shows the second embodiment, but there is no direct relationship between the second embodiment and the claims. Outboard motor
Since 170 is substantially the same as the outboard motor 10 as shown in FIG. 7, the same functional portions are denoted by the same reference numerals and description thereof is omitted. The outboard motor 170 is substantially different from the outboard motor 10 in the following points. That is, the outboard motor 170 is
A branch water passage 172 is connected to a water passage 171 provided in the intermediate member 16 so as to connect a water supply space 73 connected to the water jacket 74 and a water jacket 74, and an oil cooling pipe 173 penetrating or juxtaposed from the bottom to the top of the oil tank 42 is provided. And the branch water channel 172 is connected to an oil cooling pipe.
173 at the lower end. The upper end of the oil cooling pipe 173 communicates with the outlet side of the water jacket 74 via a water pipe 174. According to the second embodiment, the oil tank
An oil cooling pipe penetrating or juxtaposing the inside of the oil tank constitutes a cooling unit, and the lubricating oil inside the oil tank is cooled by cooling water pumped by the water pump 71. Therefore, the lubricating oil is actively cooled by the oil cooling pipe 173, and its deterioration is prevented.

FIGS. 8 to 10 show a third embodiment, but there is no direct relationship between the third embodiment and the claims.
As shown in FIGS. 8 to 10, the outboard motor 110 has a four-stroke internal combustion engine 113 mounted on an upper part of a propulsion casing 111 via an intermediate member 112, similarly to the outboard motor 10. The internal combustion engine 113 is composed of two cylinders. However, since the basic configuration of each part of the engine is substantially the same as that of the internal combustion engine 17,
The same reference numerals are given to the same functional portions as in FIG. 17, and the description is omitted. The point that the internal combustion engine 113 is substantially different from the internal combustion engine 17 is as follows.

Since the internal combustion engine 113 constitutes a dry sump type lubricating device, as shown in FIG. 9, an oil receiving portion is provided at a position between the crankshaft 29 and the camshaft 32 in the intermediate member 112.
114A is arranged, and the oil feed pump 123 described later
16A, the cylinder head 24, and a suction pipe 127A connected to a suction passage 126A provided in the intermediate member 112.
It is open to 4A. An oil tank 115 is disposed at the upper end on the rear side of the propulsion casing 111, and a pump device 116 is disposed at the lower end of the cam shaft 32.

The oil tank 115 is installed at a position near the camshaft 32 at the upper end on the rear side of the propulsion casing 111, and has a check valve 117A, an oil inflow pipe 117A, and an oil outflow pipe attached to the intermediate member 112. 118. In addition,
The oil tank 115 has an oil level gauge 120. The pump device 116 is installed around the lower end of the cam shaft 32 as shown in FIG.
4 are provided in a two-tiered state in the pump body 116A, and a common pump shaft 125 is directly connected to the lower end of the cam shaft 32.

The oil feed pump 123 has a suction opening 127 of a suction passage 126 provided in the pump body 116A and an oil receiver 114A, and also has a pump body 116A, a cover 116B,
The discharge passage 128 provided in the elastic seal member 132 is connected to an oil tank.
The lubricating oil in the oil receiver 114A is fed to the oil tank 115 by the rotation of a rotor 129 fixed to a pump shaft 125. At this time, a check valve (not shown) is provided in the discharge passage 128 in the pump body 116A, and the oil tank is provided when the outboard motor 110 is placed horizontally.
The lubricating oil in 115 is prevented from flowing back to the oil receiver 114A side.

The lubricating pump 124 includes a suction passage 130 provided in the pump body 116 A, the cover 116 B, and the elastic seal member 134.
Is connected to an oil outlet pipe 118 of an oil tank 115, and a discharge passage 131 provided in a pump body 116A is connected to an oil feed passage 132 provided in a cylinder block 22 and a cylinder head 24.
The lubricating oil in the oil tank 115 is pumped from the oil supply passage 132 by the rotation of the rotor 133 fixed to the pump shaft 125, and the lubrication parts of the engine (bearing of the crankshaft 29, bearing of the camshaft 32, etc.) ). Below the oil tank 115, a drain plug 115A is provided.

The discharge passage 131 in the pump body 116A is provided with a valve (not shown) which opens when pressure is applied,
The lubricating oil sent to the rotor 133 is prevented from flowing back to the rotor 133, and the outboard motor 110 in a state in which the lubrication pump 124 is stopped with the engine stopped is stopped by the closing pressure of the valve set by a spring. Oil tank 115 from the oil tank 115 when the
Prevents the flow of lubricating oil in the forward direction to the side. In FIG. 9, an intermediate portion of the cooling water supply pipe 73 is attached to the side wall of the oil tank 115 with an adhesive 134A containing a metal such as aluminum which is a good heat conductor to constitute a cooling portion. The lubricating oil in the tank 115 can be water-cooled. In FIG. 9, reference numeral 135 denotes an exhaust pipe. The middle part of the water supply pipe 73 is also attached to the bottom wall of the oil receiver 114A by the above-mentioned adhesive 134A to form a cooling unit, and the lubricating oil in the oil receiver 114A can be water-cooled.

According to the third embodiment, an intermediate portion of the water supply pipe 73 is attached to each of the side wall of the oil tank 115 and the bottom wall of the oil receiver 114A to form a cooling section.
Therefore, the lubricating oil in the oil tank 115 or the oil receiver 114A is actively cooled by the cooling water pumped by the water pump 71, and its deterioration is prevented.

[0027]

According to a first aspect of the present invention, there is provided a lubricating device for a four-stroke engine marine propulsion device, wherein a lubricating oil supply passage is provided.
With a filter installed vertically in the cylinder block.
An oil filter is installed on the side where the extended exhaust passage is formed
Together to form a water jacket, the external water taken in from inlet water by the water pump is supplied to the water jacket, proximate a portion of Okuaburaro between suction pump and the oil filter to the water jacket The cooling unit is not provided, and the cooling unit cools the lubricating oil. According to claim 1 of the present invention, the water jacket and the exhaust
The passage is formed on the same side of the cylinder block
The outside water at the normal temperature of about 10 ° C
And is heated by the heat from the exhaust passage, and the temperature of the cooling water is lubricated.
The temperature is suitable for cooling oil. Therefore, cold start
In such a case, the temperature of the lubricating oil
Performance can be made appropriate and at high speed rotation
The lubricating oil to the appropriate temperature by cooling it with moderately cold outside water.
Can be kept. Then, seal the oil filter
Suction pump located on the exhaust passage side in the cylinder block
A part of the oil passage between the oil filter and
Temperature of the lubricating oil sent to the oil filter
Prevents aging of the rubber seal in the oil filter
Is done. Also, install the oil filter inside the cylinder block.
Since it is located on the exhaust passage side, that is, on the water jacket side,
The passage connecting the jacket and the oil filter is short.
The configuration has been simplified. Claim 2 of the present invention
1. The lubricating device for a four-stroke engine marine propulsion device according to item 1, wherein an engine cooling water jacket is used as a water jacket. According to the second aspect of the present invention, since the existing engine cooling water jacket is also used for cooling the lubricating oil, the manufacturing cost is low.

[Brief description of the drawings]

FIG. 1 is a side view schematically showing a four-cycle engine marine propulsion device to which a first embodiment of the present invention is applied.

FIG. 2 is a partially broken side view showing the four-stroke internal combustion engine of FIG. 1;

FIG. 3 is a sectional view showing the four-stroke internal combustion engine of FIG. 1;

FIG. 4 is a sectional view showing an oil feed pump in the pump device of FIG. 1;

FIG. 5 is a sectional view showing a lubrication pump in the pump device of FIG.

FIG. 6 is a sectional view of a main part showing the four-stroke internal combustion engine of FIG. 1;

FIG. 7 is a side view schematically showing a four-cycle engine marine propulsion device to which the second embodiment is applied.

FIG. 8 is a side sectional view schematically showing a four-cycle engine marine propulsion device to which the third embodiment is applied.

FIG. 9 is a sectional view showing the four-stroke internal combustion engine of FIG. 8;

FIG. 10 is a sectional view showing the pump device of FIG. 9;

[Explanation of symbols]

 17 Internal combustion engine 22 Cylinder block 24 Cylinder head 29 Crankshaft 32 Camshaft 43 Pump device (suction pump) 66 Oil supply path 69 Oil filter 71 Water pump 72 Water inlet 74 Water jacket 81 Cooling unit

Claims (2)

(57) [Claims] 1. A suction port of a suction pump is opened to an oil reservoir, and lubricating oil in the oil reservoir is supplied to a necessary lubrication part of the internal combustion engine through an oil feed passage by the suction pump to lubricate the internal combustion engine. A four-stroke engine ship propulsion device in which lubricating oil after lubricating necessary parts flows into an oil reservoir via a return oil passage, and the lubricating oil is circulated through a lubricating oil passage including an oil supply passage and a return oil passage. Of lubricating oil
Oil filter on the road,
Oil filter on the side where the exhaust passage extending in
Water jacket formed with disposing, outside water taken in from inlet water by the water pump is supplied to the water jacket, oil feeding between the suction pump and the oil filter
A lubricating device for a four-stroke engine marine propulsion device, wherein a part of a road is formed as a cooling unit disposed close to the water jacket, and the cooling unit cools the lubricating oil. 2. A water jacket for engine cooling as a water jacket.
The lubricating device for a four-stroke engine marine propulsion device according to claim 1, wherein the lubricating device utilizes a racket .