JP4757098B2 - Outboard motor - Google Patents

Description

  The present invention includes a torque converter, an output shaft connected to the crankshaft of the engine via the torque converter, and a lower portion so as to be driven by the output shaft. An oil tank disposed in the casing, a first oil pump that sucks up the stored oil in the oil tank, and oil discharged from the first oil pump. The present invention relates to an outboard motor comprising a first supply oil path that leads to a lubrication section and a first return oil path that returns oil from the lubrication section to the oil tank.

A torque converter, an output shaft connected to the crankshaft of the engine via the torque converter, and a propeller disposed below the output shaft so as to be driven by the output shaft in a casing in which the engine is mounted An outboard motor having a shaft is already known as disclosed in Patent Document 1.
US Pat. No. 3,407,600

  In the outboard motor disclosed in Patent Document 1, since the torque converter has an internal circulation circuit configured in a hermetically sealed manner, there is a drawback that the working oil in the circulation circuit is poorly cooled and easily deteriorates.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and appropriately supplies lubricating oil that circulates between a lubricating portion of an engine and an oil tank as a working oil to a circulation circuit of a torque converter. An object of the present invention is to provide an outboard motor that can promote the cooling of the oil in the circulation circuit and prevent its deterioration without adding an oil tank.

In order to achieve the above object, the present invention provides a torque converter, an output shaft connected to the crankshaft of the engine via the torque converter, and a drive by the output shaft in a casing in which the engine is mounted on the top. a propeller shaft arranged below the output shaft so as to be, and Oh Irutanku, a first oil pump attached to the engine to suck up the stored oil in the oil tank, the discharge oil of the first oil pump a first oil supply passage to induce the lubrication of the engine, a first return oil passage recirculates the oil from the lubricating portion to said oil tank, and a second oil pump to suck the stored oil before Symbol in the oil tank, the A second supply oil path for guiding oil discharged from the second oil pump to a circulation circuit in the torque converter; A second return oil passage and outboard motor is disposed is refluxed to the oil tank, the bearing for supporting the pump shaft for driving the second oil pump is connected to the torque converter pump impeller via the bearing A bracket is fixed to the casing, a pump housing of the second oil pump is formed on a lower surface of the bearing bracket, and a lower surface of the second oil pump is a pump cover detachably coupled to the lower surface of the bearing bracket. The bearing bracket is covered with a part of a suction oil passage that guides the stored oil in the oil tank to the suction side of the second oil pump, and the part extends from the suction side of the first oil pump. A connection port to be connected to the conduit is formed, and the pump cover is formed with a part of the second return oil passage. The second return oil passage formed in the above is provided with a pressure responsive valve that opens when the upstream pressure becomes a predetermined value or more, and passes through the coupling surface between the pump cover and the bearing bracket so as to pass through the suction oil. A path and the second return oil path are in communication with each other.

According to the present invention, the lubricating oil that circulates between the lubricating portion of the engine and the oil tank is supplied to the circulation circuit of the torque converter as the working oil, so that the oil circulates between the circulation circuit and the oil pump. Therefore, the cooling of the oil in the circulation circuit can be promoted to prevent the deterioration. In addition, since it is not necessary to additionally install an oil tank for supplying oil to the circulation circuit, it is possible to avoid an increase in the size and complexity of the outboard motor. Furthermore, since the first and second oil pumps are separately provided to supply oil to the engine lubrication unit and the torque converter, the capacities of the first and second oil pumps correspond to the lubrication unit and the circulation circuit. Therefore, it is possible to easily prevent power loss due to excessive supply of oil. In addition, a pressure responsive valve is provided in the second return oil passage for returning the stored oil in the oil tank to the suction oil passage that leads to the suction side of the second oil pump. Therefore, when the engine operation is stopped, the pressure responsive valve is closed and the second return oil passage is shut off, thereby preventing oil from flowing from the torque converter circulation circuit to the oil tank. Can be maintained in a state filled with oil, so that the operational response of the torque converter can be improved.

  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 including a vertical power unit according to the present invention, FIG. 2 is an enlarged cross-sectional view of part 2 of FIG. 1, FIG. 3 is an enlarged view of the main part of FIG. FIG. 5 is a hydraulic circuit diagram including an oil pump.

  In FIG. 1, a casing 1 of an outboard motor O is mounted 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. Reference numeral Ef is a detachable engine hood that covers the engine E.

2, 3, and 4, the casing 1 includes an extension case 10, a mount case 11 that is bolted to the upper end of the extension case 10, and a gear case 12 that is bolted to the lower end of the extension case 10. The extension case 10 includes an upper case 10a and a lower case 10b coupled to the upper case 10a. The mount case 11 is coupled to the upper end surface of the upper case 10a by a plurality of bolts 16 ₃ .

The casing 1 further includes an annular lower distance member 13, a bearing bracket 14, and an annular upper distance member 15 that are sequentially stacked on the upper end of the mount case 11. The engine E is mounted on the upper distance member 15 with the crankshaft 17 facing the vertical direction and the cylinder block 18 facing the rear. The bottom wall of the cylinder block 18 and the crankcase 19 of the engine E, bearing bracket 14 and upper distance member 15 are secured by a plurality of bolts 16 ₁ and the lower distance member 13, the bearing bracket 14 and upper distance member 15 These are fixed to each other by a plurality of bolts 16 ₂ . A first oil pump 24 driven by a valve drive cam shaft 57 is attached to the cylinder head of the engine E.

  2 and 3, a vertical torque converter T is disposed in the annular upper distance member 15, and the output shaft 20 connected to the crankshaft 17 via the torque converter T is vertically mounted on the extension case 10. Placed in.

  Further, the gear case 12 horizontally supports the propeller shaft 3 provided with the propeller 2 at the rear outer end, and accommodates a forward / reverse switching gear mechanism 21 for connecting the output shaft 20 to the propeller shaft 3.

  Thus, during operation of the engine E, the power is transmitted from the crankshaft 17 to the output shaft 20 via the torque converter T and further to the propeller shaft 3 via the forward / reverse switching gear mechanism 21 to drive the propeller 2. To do. At that time, the rotation direction of the propeller 2 is controlled by the forward / reverse switching gear mechanism 21.

  In the extension case 10, an oil tank 22 that opens toward the mount case 11 is integrally formed in the upper case 10 a of the extension case 10, and is commonly used for the lubrication of the engine E and the operation of the torque converter T. Oil 23 is stored in the oil tank 22. The upper case 10a is integrally formed with a downstream end portion 90 of the exhaust path of the engine E.

  As clearly shown in FIG. 3, the torque converter T includes a pump impeller 25, a turbine runner 26 disposed above the pump impeller 25, a stator 27 disposed between the inner peripheral portions thereof, and the three It is comprised with the circulation circuit 28 for hydraulic oil defined between the impellers 25-27. These three-blade wheels 25 to 27 are arranged such that a common axis is oriented in the vertical direction in the same manner as the crankshaft 17 and the output shaft 20.

A transmission cover 29 that covers the upper surface of the turbine runner 3 is integrally connected to the pump impeller 25. A starting ring gear 30 is fixed to the outer peripheral surface of the transmission cover 29, and a drive plate 31 fixed to the lower end of the crankshaft 17 with a bolt 32 ₁ is fixed to the ring gear 30 with a bolt 32 ₂ . The torque converter T is suspended from the crankshaft 17 via the drive plate 31.

  A cup-shaped support cylinder 34 that fits into a support hole 33 that opens at the center of the lower end surface of the crankshaft 17 is fixed to the center of the transmission cover 29. The output shaft 20 has an upper end extending into the support cylinder 34, and the upper end is supported in the support cylinder 34 via a bearing bush 35. A hub of the turbine runner 26 is splined to the output shaft 20. Combined. A hollow stator shaft 37 supported by a needle bearing 36 is disposed on the outer periphery of the output shaft 20, and a known free wheel 38 is interposed between the stator shaft 37 and the hub of the stator 27. Is done.

  On the outer periphery of the stator shaft 37, a hollow pump shaft 39 that is integrally connected to the pump impeller 25 and extends downward is disposed. The pump shaft 39 is supported on the bearing bracket 14 via an upper ball bearing 43 on the outer peripheral side, and a second oil pump 41 driven by the lower end portion of the pump shaft 39 is formed on the lower surface of the bearing bracket 14. A pump cover 42 mounted on the pump housing 40 and covering the lower surface of the second oil pump 41 is bolted to the lower surface of the bearing bracket 14. Further, an oil seal 45 is attached to the upper end portion of the bearing bracket 14 so that the lip is brought into close contact with the outer peripheral surface of the pump shaft 39 immediately above the ball bearing 43.

  The stator shaft 37 has an enlarged diameter portion 37a at its lower end, and a flange 37b fixed to the pump cover 42 with a bolt 46 is integrally formed on the outer circumference of the enlarged diameter portion 37a. A lower ball bearing 44 that supports the output shaft 20 is mounted on the periphery.

  Thus, the pump shaft 39 is supported on the bearing bracket 14 via the upper ball bearing 43, and the output shaft 20 is supported on the enlarged diameter portion 37 a of the stator shaft 37 via the lower ball bearing 44. The support of the pump shaft 39, the stator shaft 37, and the output shaft 20 becomes rational, and the vertical fluid transmission device including the torque converter T and the output shaft 20 can be made compact.

  Further, since the second oil pump 41 is attached to the bearing bracket 14 using the space between the upper and lower ball bearings 43, 44, the vertical fluid transmission device with the second oil pump 41 can be configured compactly. it can.

  A thrust needle bearing 47 is interposed between the pump impeller 25 and the hub of the stator 27, and a thrust needle bearing 48 is also interposed between the hub of the turbine runner 26 and the transmission cover 29.

  The first oil pump 24 (see FIG. 1) pumps up the oil in the oil tank 22 and supplies it to the lubrication part of the engine E, and the second oil pump 41 is also the oil in the oil tank 22. Is supplied to the circulation circuit 28 of the torque converter T, and the paths of the oil discharged from the first and second oil pumps 24 and 41 will be described with reference to FIG.

The downstream side of the intake oil passage 50 extending from the single oil tank 22 is divided into two branches , the first and second branch intake oil passages 50a and 50b. These first and second branch intake oil passages 50a, The first and second oil pumps 24 and 41 are connected to 50b, respectively. The first oil pump 24 discharges the oil sucked up from the oil tank 22 through the first branch intake oil passage 50 a to the first supply oil passage 51. The oil discharged to the first supply oil passage 51 is filtered by an oil filter 53 provided in the middle of the first supply oil passage 51 and then supplied to the lubrication part of the engine E. The lubricated oil flows down to the bottom of the crankcase 19 of the engine E, and returns to the oil tank 22 through the first return oil passage 59.

  On the other hand, the second oil pump 41 discharges oil drawn up from the same oil tank 22 through the second branch intake oil passage 50b to the second supply oil passage 52, and the oil is used as working oil in the circulation circuit 28 of the torque converter T. The oil that has finished its work in the circulation circuit 28 returns to the suction oil passage 50 or the oil tank 22 through the second return oil passage 54.

  A relief oil passage 55 that reaches the suction oil passage 50 is branched from the first supply oil passage 51 upstream of the oil filter 53, and the oil pressure of the first supply oil passage 51 is a specified value in the relief oil passage 55. A relief valve 56 is provided that opens when the above is reached.

The second return oil passage 54 is provided with a normally closed type pressure responsive valve 58, which opens when the oil pressure upstream of the second return oil passage 54 exceeds a predetermined value. ing.

  The first and second oil pumps 24 and 41 are configured with capacities corresponding to required characteristics of the circulating portion of the engine E and the circulating circuit 28 of the torque converter T. In the illustrated example, the second oil pump 41 is provided. Is configured to have a smaller capacity than the first oil pump 24.

Again, in FIGS. 2 and 3, the upstream portion of the intake oil passage 50 is constructed above only tube 50c sucks to plunge the lower end is suspended in a bearing bracket 14 in the oil tank 22, the suction tube 50c Is connected to the second branch intake oil passage 50 b provided on the bearing bracket 14 and communicating with the intake port 41 a of the second oil pump 41 . A conduit that extends from the suction side of the first oil pump 24 and constitutes the first branch intake oil passage 50a is connected to a connection port 50d that is formed in the bearing bracket 14 and communicates with the second branch intake oil passage 50b. .

  The second supply oil passage 52 has a bottomed vertical hole 52b provided at the center thereof so as to open to the upper end surface of the output shaft 20, the pump cover 42, the stator shaft 37, and the output shaft 20. The inlet oil passage 52a is provided so as to pass through the fitting portion and communicates the discharge port 41b of the second oil pump 41 with the lower portion of the vertical hole 52b, and the upper portion of the vertical hole 52b passes through the peripheral portion of the thrust needle bearing 48. And a horizontal hole 52c provided in the output shaft 20 so as to communicate with the transmission cover 29.

The second return oil passage 54 is defined between the output shaft 20 and the stator shaft 37 and communicates with the circulation circuit 28 through the peripheral portion of the thrust needle bearing 47 on the hub of the pump impeller 25. And a lateral outlet oil passage 54b provided in the pump cover 42 so as to communicate with the lower end of the cylindrical oil passage 54a. The outlet oil passage 54b is connected to the second branch intake via the pressure responsive valve 58. It communicates with the oil passage 50b.

The pressure responsive valve 58 includes a horizontal cylindrical valve chamber 60 provided in the pump cover 42, and a piston-like valve body 61 that is slidably fitted in the valve chamber 60. The outlet oil passage 54 b is opened at the end face, and the valve branch 62 that opens to the second branch intake oil passage 50 b or the oil tank 22 is opened on the inner surface of the valve chamber 60. The valve body 61 is arranged with its top surface or pressure receiving surface facing the outlet oil passage 54b, and closes the valve hole 62 when moving forward toward the outlet oil passage 54b, and opens the valve hole 62 when moving backward. Yes. A valve spring 63 that urges the valve body 61 in a forward direction, that is, a valve closing direction with a predetermined set load is contracted between the back surface of the valve body 61 and a screw plug 64 that is screwed into the opening of the valve chamber 60. Established. Therefore, the valve body 61 is normally held at the valve-closed position by the set load of the valve spring 63, thereby blocking the second return oil passage 54, and hydraulic pressure is provided upstream of the second return oil passage 54. When this occurs and rises above a predetermined value, the valve body 61 that has received the hydraulic pressure on its top surface retreats against the set load of the valve spring 63 and opens, thereby opening the second return oil passage 54. Is turned on.

  The bottom wall of the crankcase 19 of the engine E is provided with an opening 66 (see FIG. 2) through which oil that has been lubricated by the engine E flows out, and this opening 66 is formed between the upper distance member 15 and the bearing bracket 14. It is opened to the upper surface of the mount case 11 through a series of longitudinal through holes 67 provided in the outer peripheral portion and the inner portion of the annular lower distance member 13. The mount case 11 is provided with an opening 68 that opens toward the oil tank 22. Therefore, the oil that has finished lubricating the engine E and has flowed down to the bottom of the crankcase 19 returns to the oil tank 22 through the opening 66, the through hole 67, and the opening 68. The opening 66, the through hole 67, and the opening 68 constitute the first return oil passage 59.

In Figure 3, the outer periphery of the stator shaft 37, the first seal member 70 ₁ is attached to close relatively rotatable on the inner peripheral surface of the pump shaft 39, oil in the torque converter T is, flows out to the pump shaft 39 downwardly To prevent you from doing.

The said _two second seal member 70 is Kai裝below the inlet oil passage 52a to the contact portion of the stator shaft 37 and the pump cover 42, the oil inlet oil passage 52a is of the stator shaft 37 and the pump cover 42 abuts subordinates To prevent it from leaking out.

Further, in the fitting portion of the output shaft 20 and the stator shaft 37, third and fourth are arranged on the outer periphery of the output shaft 20 so as to be relatively rotatable with the inner peripheral surface of the stator shaft 37 along the upper and lower sides of the inlet oil passage 52 a. Seal members 70 ₃ and 70 ₄ are attached, and the third and fourth seal members 70 ₃ and 70 ₄ cooperate with each other so that the oil in the inlet oil passage 52a is outside the fitting portion between the output shaft 20 and the stator shaft 37. prevented from flowing out to, also the third seal member 70 ₃ at the top, the oil of the cylindrical oil passage 54a is adapted to prevent flow out to the fitting portion of the lower output shaft 20 and the stator shaft 37 ing.

  3 to 4, the output shaft 20 includes the upper output shaft 20a having the vertical hole 52b and supported by the lower ball bearing 44, and the forward / reverse switching gear mechanism 21 (see FIG. 1). The upper end of the lower output shaft 20b is supported by a support cylinder 71 formed integrally with the outside of the oil tank 22 via a bush 72. The upper output shaft 20 a has a flange 73 that abuts on the upper end surface of the inner race of the ball bearing 44 mounted on the inner periphery of the enlarged diameter portion 37 a of the stator shaft 37, and below the outer race of the ball bearing 44. A retaining ring 74 that supports the end surface is locked to the inner peripheral surface of the enlarged diameter portion 37a. Therefore, unless the retaining ring 74 is removed, the upper output shaft 20a is prevented from coming out downward from the center of the torque converter T.

In addition to the vertical hole 52b, the upper output shaft 20a is provided with a plug hole 76 that is continuous with the lower end of the vertical hole 52b, and a spline hole 77 that is continuous with the lower end of the plug hole 76 and opens at the lower end surface of the upper output shaft 20a. Then, a plug 78 constituting the bottom wall of the vertical hole 52b is screwed into the plug hole 76. The plug 78, the fifth seal member 70 ₅ to close contact with the inner peripheral surface of Sen'ana 76 is mounted.

  The inlet oil passage 52a can be formed by avoiding the plug 78.

  On the other hand, a spline shaft 80 is formed at the upper end of the lower output shaft 20b, and the upper and lower output shafts 20a and 20b are connected to each other by fitting the spline shaft 80 into the spline hole 77.

  Next, the operation of this embodiment will be described.

  During the operation of the engine E, the first oil pump 24 driven by the valve camshaft 57 sucks up the oil 23 in the oil tank 22 through the first branch intake oil passage 50a as described above, and the first supply oil passage 51 Therefore, the oil is supplied to the lubrication part of the engine E. The lubricated oil flows down to the bottom of the crankcase 19 of the engine E, and returns to the oil tank 22 through the first return oil passage 59.

  On the other hand, the second oil pump 41 driven by the pump shaft 39 sucks up the oil 23 in the same oil tank 22 through the second branch intake oil passage 50b as described above, and supplies it to the second supply oil passage 52 as working oil. Since the hydraulic oil is discharged, the hydraulic oil goes up the vertical hole 52b of the upper output shaft 20a through the inlet oil passage 52a, goes out of the horizontal hole 52c and moves into the transmission cover 29 while lubricating the thrust needle bearing 48, and then the turbine runner. 26 flows into the circulation circuit 28 from the outer peripheral side of the circuit 26.

  The oil in the circulation circuit 28 circulates in the circulation circuit 28 as indicated by the arrow accompanying the rotation of the pump impeller 25, thereby transmitting the rotational torque of the pump impeller 25 to the turbine runner 26 and driving the output shaft 20. At this time, if a torque amplifying action is generated between the pump impeller 25 and the turbine runner 26, a reaction force associated therewith is borne by the stator 27, and the stator 27 is fixed by the locking action of the free wheel 38. Since the propeller 2 can be driven strongly by such torque amplification action of the torque converter T, the start and acceleration of the ship can be effectively enhanced.

  When the torque amplification action is finished, the stator 27 rotates in the same direction together with the pump impeller 25 and the turbine runner 26 while the free wheel 38 is idling due to the reversal of the torque direction received by the stator 27.

  The working oil that has finished its work in the circulation circuit 28 descends the cylindrical oil passage 54a while lubricating the thrust needle bearing 47 at the upper part of the hub of the pump impeller 25, and moves from the outlet oil passage 54b to the valve chamber of the pressure responsive valve 58. .

  The oil flowing into the valve chamber 60 presses the valve body 61 of the pressure responsive valve 58 against the set load of the valve spring 63 by the pressure, so that the valve body 61 is opened and the valve hole 62 is opened. The oil returns from the valve chamber 60 to the intake oil passage 50 or the oil tank 22 through the valve hole 62.

  Thus, oil circulates through the second supply oil passage 52 and the second return oil passage 54 between the circulation circuit 28 of the torque converter T and the oil tank 22 disposed therebelow. There is no need to provide an oil sump, so that the torque converter T can be made compact, and the cooling of the oil in the circulation circuit 28 can be promoted and its deterioration can be prevented.

  In particular, the oil tank 22 disposed below the torque converter T is separated from the engine E, so that the heating by the engine E is small, and the capacity is relatively large without being interfered by the engine E and the torque converter T. The cooling of the circulating oil can be further promoted, for example, by increasing the oil flow rate to the circulation circuit 28. In addition, the engine E, the torque converter T, and the oil tank 22 are arranged in that order, and the torque converter T can be configured to be compact without being interfered with the oil tank 22, so that a ship including them is provided. The outer unit O can be made slim and lightweight.

  Further, since the oil pumped up by the first and second oil pumps 24 and 41 from the common oil tank 22 is supplied to the lubrication part of the engine E and the circulation circuit 28 of the torque converter T, the circulation circuit 28 of the torque converter T. It is not necessary to add a dedicated oil tank for the engine, and the size and structure of the outboard motor can be avoided, and the capacity of the first and second oil pumps 24 and 41 can be increased by lubricating the engine E. And a circuit corresponding to each required characteristic of the circulation circuit 28 of the torque converter T, and power loss due to excessive supply of oil can be easily prevented.

  Meanwhile, the long output shaft 20 is divided into an upper output shaft 20a and a lower output shaft 20b that are spline-coupled to each other so that the upper output shaft 20a can be connected to the stator shaft 37, the lower ball bearing 44, and the stop shaft. Since it is connected in the axial direction via the ring 74, the torque converter T, the bearing bracket 14, the pump cover 42, and the upper output shaft 20a are used as vertical fluid transmission devices and are compact without being obstructed by the lower output shaft 20b. It can be unitized, and the assembly property of the vertical fluid transmission device and the mounting property to the outboard motor O can be improved.

  Further, for example, when the gear case 12 is separated from the extension case 10 for maintenance of the forward / reverse switching gear mechanism 21, the spline shaft 80 of the lower output shaft 20b is pulled out from the spline hole 77 of the upper output shaft 20a. The lower output shaft 20b can be separated downward together with the gear case 12 while leaving the output shaft 20a on the torque converter T side. Thereby, not only can the maintenance of the forward / reverse switching gear mechanism 21 be performed easily, but also the vertical fluid transmission can be avoided from being disassembled, and the gear case 12 can be easily reassembled.

  Moreover, since the bottom wall of the vertical hole 52b that is a part of the second supply oil passage 52, that is, the plug 78, is screwed to the upper output shaft 20a remaining in the vertical fluid transmission device, the lower output shaft 20b Even at the time of separation, oil can be prevented from flowing out from the vertical hole 52b to the lower side of the upper output shaft 20a. In this case, the bottom wall of the vertical hole 52b can be formed integrally with the upper output shaft 20a. However, when the plug 78 is used, the vertical hole 52b, the plug hole 76, and the spline hole 77 are formed on the upper output shaft 20a. Since it is provided so as to penetrate in the axial direction, it is advantageous in that it is possible to reliably prevent residual chips by washing after the processing of these holes.

  The same applies to the case where the engine E and the torque converter T are removed from the mount case 11, and therefore maintenance thereof can be easily performed.

  Further, the engine E includes a bearing bracket 14 that supports the pump shaft 39 of the torque converter T, an upper distance member 15 that is connected to the upper end of the bearing bracket 14 and surrounds the torque converter T, and a lower distance that is connected to the lower end of the bearing bracket 14. Since it is attached to the mount case 11 via the member 13, the engine E can be easily attached to the mount case 11 without being interfered by the torque converter T, and the assemblability is good.

  In addition, since the second oil pump 41 is mounted on a pump housing 40 formed on the lower surface of the bearing bracket 14 and the pump cover 42 is held, the bearing bracket 14 not only supports the torque converter T but also the second oil pump. 41 is also supported, and the support structure of the second oil pump 41 can be simplified.

  When the operation of the engine E is stopped, the operation of the second oil pump 41 is also stopped. Therefore, in the pressure responsive valve 58, the pressure in the valve chamber 60 is reduced, and the valve body 61 is closed by the set load of the valve spring 63. To do. As a result, the outlet oil passage 54b is cut off, so that oil outflow from the circulation circuit 28 of the torque converter T to the oil tank 22 can be prevented, and the circulation circuit 28 can be held in a state filled with oil. Therefore, the operation responsiveness of the torque converter T can be improved.

  Further, a part of the second supply oil passage 52 is formed by a vertical hole 52b that is formed at the center of the upper output shaft 20a and communicates the upper end portion with the circulation circuit 28. The configuration can be simplified and the backflow of oil from the circulation circuit 28 to the second oil pump 41 can be prevented by the vertical hole 52b when the operation of the engine E is stopped.

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 containing the vertical power unit of this invention. FIG. 2 is an enlarged sectional view of a part 2 in FIG. 1. The principal part enlarged view of FIG. 4 is an enlarged cross-sectional view of part 4 in FIG. 1 is a hydraulic circuit diagram including an oil pump.

E ... Engine O ... Outboard motor T ... Torque converter 1 ... Casing 3 ... Propeller shaft
14 ··· Bearing bracket 17 ··· Crankshaft 20 ··· Output shaft 22 · · · Oil tank 23 · · · Oil 24 · · · First oil pump
25... Pump impeller 28... Circulation circuit
39 ... Pump shaft
40: Pump housing 41: Second oil pump
42... Pump cover 51... First supply oil passage 52... Second supply oil passage 54.
58: Pressure responsive valve 59: First return oil passage

Claims (1)

In a casing (1) on which the engine (E) is mounted, a torque converter (T) and an output shaft (17) connected to the crankshaft (17) of the engine (E) via the torque converter (T) 20), a propeller shaft arranged below the output shaft to be driven by the output shaft (20) (20) and (3), and Oh Irutanku (22), the reservoir in the oil tank (22) A first oil pump (24) attached to the engine (E ) to suck up the oil (23), and a first supply oil for guiding the oil discharged from the first oil pump (24) to the lubrication part of the engine (E) a road (51), and the oil passage (59) first return recirculates the oil from the lubricating portion to said oil tank (22), before Symbol second Oirupon siphon oil (23) stored in the oil tank (22) (41), a second supply oil passage (52) for guiding oil discharged from the second oil pump (41) to a circulation circuit (28) in the torque converter (T), and the circulation circuit (28). An outboard motor provided with a second return oil passage (54) for returning oil to the oil tank (22) side ;
A bearing bracket (14) connected to a pump impeller (25) of the torque converter (T) and supporting a pump shaft (39) for driving the second oil pump (41) via a bearing (43) is provided in the casing. The pump housing (40) of the second oil pump (41) is formed on the lower surface of the bearing bracket (14) and is detachably coupled to the lower surface of the bearing bracket (14). The lower surface of the second oil pump (41) is covered by the pump cover (42), and the stored oil (23) in the oil tank (22) is supplied to the bearing bracket (14) by the second oil pump ( 41) a part of the suction oil passage (50) leading to the suction side, and a connection for connecting the part to a conduit (50a) extending from the suction side of the first oil pump (24). The pump cover (42) is formed with a part of the second return oil passage (54), and the second return oil passage formed in the pump cover (42). (54) is provided with a pressure responsive valve (58) that opens when the upstream pressure exceeds a predetermined value, and penetrates the coupling surface between the pump cover (42) and the bearing bracket (14). The outboard motor characterized in that the suction oil passage (50) and the second return oil passage (54) communicate with each other .

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