JP4690989B2 - Outboard motor lubrication system - Google Patents

Description

The invention, together with supporting a propeller shaft at the bottom, are formed in the casing for mounting the engine in the upright position of the crankshaft to the top, and an oil pan for storing lubricating oil supplied to the engine, it is driven by the engine Outboard equipped with an oil pump, a suction oil passage that guides oil in the oil pan to the suction port of the oil pump, and a supply oil passage that guides oil discharged from the discharge port of the oil pump to the lubrication part of the engine The present invention relates to improvement of a machine lubrication device.

Lubricating device of such outboard motor is known as disclosed in Patent Document 1.
JP-A-58-183384

In the lubricating device of the prior art for either Ru outboard motor is in the center of the oil pan, so as to penetrate it, by placing the cooling water passage of the engine, so that to cool the stored oil in the oil pan. However, in order to cool the entire stored oil in the oil pan with the cooling water of the engine, a large amount of cooling water is required, so the cooling efficiency is extremely low.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points. An oil lubrication part of an engine is formed by cooling a suction oil passage for guiding oil in an oil pan to an intake port of an oil pump with engine cooling water. oil can be efficiently cooled to be supplied to, and to provide a lubricating device of the outboard motor.

To achieve the above object, the present invention is to support the propeller shaft under portion, it is formed in the casing for mounting the engine in the upright position of the crankshaft to the top, for storing lubricating oil supplied to the engine An oil pan, an oil pump driven by the engine, a suction oil passage that guides oil in the oil pan to the suction port of the oil pump, and oil discharged from the discharge port of the oil pump is guided to the lubricating portion of the engine In an outboard motor lubrication device comprising a supply oil passage, the passage cross-sectional area is larger than that of the water suction pipe at the downstream end of the water suction pipe for taking in engine cooling water from the water intake at the bottom of the casing, and the engine water A cooling water inlet chamber communicating with the jacket inlet is connected, and the cooling water inlet chamber and the oil pan are connected to the cooling water inlet chamber by a half or more. The oil pan is disposed adjacently through a part of the side wall of the oil pan so that the upstream oil passage having a circular cross section of the suction oil passage is in the side wall of the oil pan. is formed in a vertical direction, that between the oil passage and the inner space of the oil pan, features that are communicated via the upstream end hole formed in the lower end portion of the common partition wall for partitioning between to.

According to the first feature of the present invention, the limited amount of oil that is discharged from the oil pan and sucked up by the oil pump is cooled by the cooling water flowing through the cooling water inlet chamber connected to the downstream end of the water absorption pipe. In addition to improving the cooling efficiency of the oil, the cooled oil can be used not only to lubricate the engine, but also to cool it, which can contribute to improving its durability.

Also forming the oil passage of the oil passage wicking in one side wall of the oil pan in the vertical direction, and the cooling water inlet chamber, so that it is adjacent via a common partition wall between the upstream oil passage, integral with the oil pan By connecting to the casing, not only the oil pan but also the upstream oil passage, the cooling water inlet chamber and the common partition wall are formed in the casing, so that the piping of the upstream oil passage and the cooling water inlet chamber and supporting them are supported. A stay is not required, the outboard motor lubrication device can be simplified and reduced in weight, and oil cooling can be further promoted by heat radiation from the oil pan and the upstream oil passage to the casing.

  Embodiments of the present invention will be described below based on preferred embodiments of the present invention shown in the drawings.

  1 is a side view of an outboard motor according to an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of the main part of FIG. 1, FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. FIG. 5 is a plan view of the gasket, FIG. 6 is an enlarged view of a portion 6 in FIG. 2, and FIG. 7 is a flow chart of the engine lubrication device.

  In FIG. 1, in the outboard motor O, the stern bracket 8 side is referred to as the front, and the opposite side is referred to as the rear. The casing 1 of the outboard motor O is equipped with a water-cooled multi-cylinder four-stroke engine E at the top and supports a propeller shaft 3 having a propeller 2 at the rear end at the bottom. A vertical swivel shaft 6 attached to the casing 1 via an upper arm 4 and a lower arm 5 is disposed immediately before the casing 1, and a swivel case 7 that rotatably supports the swivel shaft 6 is a transom of the hull. It is connected to a stern bracket 8 clamped to Bt via a tilt shaft 9 in the horizontal direction. Therefore, the casing 1 can be steered left and right around the swivel shaft 6 and can be tilted up and down around the tilt shaft 9.

  An engine hood 10 that covers the engine E is detachably attached to the upper end of the casing 1. An air intake 11 is provided at the upper rear end of the engine hood 10, and an intake chamber 12 and a throttle body 13 are disposed at the front of the engine hood 10.

  The casing 1 includes an extension case 15, a mount case 16 that is bolted to the upper end of the extension case 15, and a gear case 17 that is bolted to the lower end of the extension case 15. The extension case 15 includes an upper case 15a and a lower case 15b that is bolted to the upper case 15a. A mount case 16 is bolted to the upper end surface of the upper case 15a with a gasket 18 interposed therebetween. The engine E is mounted on the mount case 16 with the crankshaft 20 directed vertically and the cylinder block 14 directed rearward, and an output shaft 21 connected to the crankshaft 20 is disposed vertically on the extension case 15. Is done. A ring gear 22 driven by a starter (not shown) is fixed to the lower end portion of the crankshaft 20.

  The gear case 17 horizontally supports the propeller shaft 3 with the propeller 2 attached to the rear outer end thereof, and houses a forward / reverse switching gear mechanism 23 for connecting the output shaft 21 to the propeller shaft 3.

  Thus, during operation of the engine E, the power is transmitted from the crankshaft 20 to the output shaft 21 and further to the propeller shaft 3 via the forward / reverse switching gear mechanism 23 to drive the propeller 2. At that time, the rotation direction of the propeller 2 is controlled by the forward / reverse switching gear mechanism 23.

2 and 3, the upper case 15a of the extension case 15 includes an oil pan 25 occupying the front majority, a cooling water outlet chamber 27 adjacent to the rear half of the oil pan 25, and an oil pan 25. An idle exhaust chamber 50 adjacent to the rear other half is integrally formed. A cooling chamber inlet chamber 26 having a passage cross-sectional area larger than that of a water absorption pipe 52 (described later) is integrally formed at the center of the upper case 15a so as to enter between the oil pan 25 and the cooling water outlet chamber 27. That is, the cooling water inlet chamber 26 and the oil pan 25 are adjacent to each other through a part of the side wall of the oil pan 25 so that the cooling water inlet chamber 26 bites into the oil pan 25 over a half circumference. Be placed. More central portion of the cooling water inlet chamber 26, is formed integrally such that the exhaust passage 28 through the cooling water inlet chamber 26 up and down. The idle exhaust chamber 50 is divided into a first chamber 50a on the radially inner side and a second chamber 50b on the outer side thereof, and both the chambers 50a and 50b communicate with each other through a lower communication hole 54. The first chamber 50 a communicates with an intermediate portion of the exhaust passage 28 via a passage (not shown), and the second chamber 50 b communicates with an idle exhaust pipe 56 attached to the rear end portion of the mount case 16. Therefore, when the engine E is idling, even if the lower end of the exhaust passage 28 is submerged below the water surface, the exhaust gas of the engine E is smoothly discharged from the idle exhaust pipe 56 through the idle exhaust chamber 50 from the middle of the exhaust passage 28. be able to.

  Now, a lubricating device for the engine E including the oil pan 25 will be described with reference to FIGS.

  As shown in FIG. 2, the cylinder head 19 joined to the rear end of the cylinder block 14 is driven at a reduction ratio of ½ from the crankshaft 20 through a timing transmission device 29 above the engine E. A valve camshaft 30 is supported in a posture parallel to the crankshaft 20, and an oil pump 31 driven by the camshaft 30 is attached to the lower end portion of the cylinder head 19. A suction oil passage 33 that guides the oil 32 in the oil pan 25 to the oil pump 31 is provided between the suction port of the oil pump 31 and the oil pan 25.

  The suction oil passage 33 is composed of an upstream oil passage 33a and a downstream oil passage 33b that are divided at the joint surface between the oil pan 25 and the mount case 16, and is disposed at a portion opposite to the upstream oil passage 33a and the downstream oil passage 33b. The stainless steel filter net 34 is inserted as a strainer.

The upstream oil passage 33 a of the suction oil passage 33 has a circular cross section and is formed vertically in the partial side wall of the oil pan 25, and an upstream end hole 35 that opens to the bottom of the oil pan 25. Is drilled by the rotary tool 36 which is made to enter obliquely from the upper open surface of the oil pan 25. This eliminates the need for a closing plug after the upstream end hole 35 is processed.

  The downstream oil passage 33 b is formed integrally from the mount case 16 to the cylinder block 14 and the cylinder head 19 and reaches the suction port of the oil pump 31.

  As shown in FIGS. 2, 5, and 6, the gasket 18 interposed between the joint surfaces of the upper case 15 a and the mount case 16 is made of stainless steel, and the oil pan 25 and the mount case 16 are joined. It extends to between the surfaces, and a portion corresponding to the suction oil passage 33 is an opening 37. On the other hand, the filter net 34 includes a bulging portion 34a that is received in the upstream oil passage 33a from the upper end surface of the oil pan 25, and a joining flange 34b that projects radially from the upper end of the bulging portion 34a. The joint flange 34b is welded around the opening 37 of the gasket 18. Thus, the filter net 34 is integrally connected to the gasket 18.

  As shown in FIG. 7, the discharge port of the oil pump 31 includes a first lubrication portion 39 around the crankshaft 20 of the engine E, a second lubrication portion 40 around the camshaft 30, and a third around the timing transmission device 29. A supply oil passage 38 for supplying the oil 32 is connected to the lubricating portion 41, and an oil filter 43 and a relief valve 44 are provided on the upstream side of the supply oil passage 38.

  Thus, during operation of the engine E, the oil pump 31 driven from the camshaft 30 sucks up the oil 32 in the oil pan 25 through the suction oil passage 33 and discharges it to the supply oil passage 38. Oil 32 is supplied to the first to third lubrication portions 39 to 41 to lubricate the crankshaft 20, the camshaft 30, the timing transmission device 29, and the like. The oil that has been lubricated returns to the oil pan 25 by gravity.

  During this time, in the suction oil passage 33, the filter net 34 filters the oil 32 going to the oil pump 31, and in the supply oil passage 38, the oil filter 43 further filters the oil 32 going to the first to third lubrication parts 39 to 41. To do.

  By the way, since the said filter net | network 34 which exhibits a strainer function is pinched | interposed between the upstream oil path 33a and the downstream oil path 33b, it does not require a strainer case like the conventional strainer, and can contribute to the weight reduction of a lubrication apparatus. .

  In particular, since the filter screen 34 is integrally connected to the gasket 18 interposed between the oil pan 25 and the mount case 16, the support structure of the filter screen 34 is simple and reliable, and the cost of the lubrication apparatus is reduced. Can contribute.

  Further, since the upstream oil passage 33a of the suction oil passage is formed integrally with the side wall of the oil pan 25, a stay for supporting the suction pipe as in the prior art becomes unnecessary, which also contributes to the weight reduction of the lubricating device.

  Next, a cooling device for the engine E including the cooling water inlet chamber 26 and the cooling water outlet chamber 27 will be described with reference to FIGS.

  In FIG. 1, a water intake 51 for taking outside water as cooling water is provided on one side wall of the gear case 17. On the other hand, as shown in FIG. 2, the bottom wall of the cooling water inlet chamber 26 is shaped like a mortar, and a connection port 26a is provided at the lowermost part to connect the intake port 51 and the connection port 26a. A water absorption pipe 52 is disposed in the extension case 15. A water pump 53 driven by the output shaft 21 is interposed in the water absorption pipe 52, and the water taken in from the water intake 51 is supplied to the cooling water inlet chamber 26. It is supposed to be pumped to.

  The cooling water inlet chamber 26 communicates with an inlet of a water jacket (not shown) of the engine E, and guides the cooling water pumped from the water pump 53 to the water jacket. The cooling water that has finished cooling the engine E while passing through the water jacket moves to the cooling water outlet chamber 27. The cooling water transferred to the cooling water outlet chamber 27 is discharged into the extension case 15 through the drain hole 27a in the bottom wall of the cooling water outlet chamber 27.

  Since the downstream end of the exhaust passage 28 passing through the central portion of the cooling water inlet chamber 26 is also opened in the extension case 15, the cooling water is discharged into the central portion of the propeller 2 together with the exhaust gas discharged from the exhaust passage 28. It is discharged to the outside from the provided through hole.

  If the connecting port 26a is disposed on the front side at the bottom of the cooling water inlet chamber 26, the cooling water inlet chamber is set when the outboard motor O is tilted forward after the operation of the engine E is stopped. The remaining water can be more reliably discharged to the connection port 26a.

  The cooling water inlet chamber 26, the oil pan 25, and the upstream oil passage 33a of the suction oil passage 33 are formed integrally with the upper case 15a of the extension case 15, and the cooling water inlet chamber 26 and the upstream oil passage 33a are: It arrange | positions so that it may adjoin on both sides of the common partition 16a integral with the upper case 15a.

  Thus, the cooling water in the cooling water inlet chamber 26 cools the oil at a limited flow rate that comes out of the oil pan 25 and is sucked into the oil pump 31. The cooled oil can cool the first to third lubrication parts 39 to 41 of the engine E as well as lubrication, and can contribute to improving the durability of the engine E.

  At that time, the oil pan 25, the upstream oil passage 33a of the suction oil passage 33, the cooling water inlet chamber 33a, and the common partition wall 55 between the upstream oil passage 33a and the cooling water inlet chamber 33a are integrated with the upper case 15a of the extension case 15. This eliminates the need for the piping of the upstream oil passage 33a and some of the water passages and stays for supporting them, simplifying and reducing the weight of the lubrication device, and further simplifying and reducing the weight of the outboard motor O. Moreover, the cooling of the oil can be further promoted by the heat radiation from the oil pan 25 and the upstream oil passage 33a to the extension case 15.

  The present invention is not limited to the above embodiments, and various design changes can be made without departing from the scope of the invention.

The side view of the outboard motor which concerns on the Example of this invention. The principal part expanded sectional view of FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. FIG. 4 is a sectional view taken along line 4-4 of FIG. The top view of a gasket. FIG. 6 is an enlarged view of 6 parts in FIG. 2. FIG. 3 is a flow chart of an engine lubrication device.

E ... Engine O ... Outboard motor 1 ... Casing 3 ... Propeller shaft 20 ... Crankshaft 25 ... Oil Bread
26 ... Cooling water inlet chamber 31 ... Oil pump 32 ... Oil 33 ... Suction oil passage 33a ... Upstream oil passage 33b ... Downstream oil passage
35... Upstream end hole 38... Supply oil passage 39 to 41... Lubrication part 51.
52 ... Water absorption pipe 55 ... Common bulkhead

Claims (1)

While supporting the propeller shaft (3) under unit, a crank shaft at the top (20) is formed in the casing (1) for mounting the engine (E) in which the mounted vertically, lubricating oil supplied to the engine (E) The oil pan (25) storing (32), the oil pump (31) driven by the engine (E), and the oil (32) in the oil pan (25) are guided to the suction port of the oil pump (31). And a supply oil passage (38) for guiding oil discharged from a discharge port of the oil pump (31) to a lubricating portion (39 to 41) of the engine (E). Machine lubrication equipment,
The passage cross-sectional area is larger than that of the water absorption pipe (52) at the downstream end of the water absorption pipe (52) for taking in the engine cooling water from the water intake (51) at the bottom of the casing (1), and the water of the engine (E) A cooling water inlet chamber (26) communicating with the jacket inlet is connected, and the cooling water inlet chamber (26) and the oil pan (25) are used for oil around the cooling water inlet chamber (26) over a half circumference. It is arranged adjacently through a side wall of a part of the oil pan (25) so as to bite into the pan (25),
An upstream oil passage (33a) having a circular cross section of the suction oil passage (33) is formed in the vertical direction in the partial side wall of the oil pan (25), and the upstream oil passage (33a) and Lubrication of an outboard motor, characterized in that it communicates with the internal space of the oil pan (25) via an upstream end hole (35) drilled at the lower end of a common partition partitioning the oil pan (25). apparatus.

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