JP5867014B2 - Foreign matter recovery structure for outboard motor lubricant - Google Patents

Description

  The present invention relates to a foreign matter recovery structure for lubricating oil of an outboard motor. Specifically, the present invention relates to a foreign matter recovery structure for an outboard motor lubricant that removes foreign matter such as wear powder contained in the lubricant by adsorbing it with a magnet.

  Conventional outboard motors transmit a drive shaft for transmitting the rotational power of the engine, a propeller shaft provided with a propeller for propulsion, and transmit the rotation of the drive shaft to the propeller shaft in an intermittent manner and change the rotation direction of the propeller shaft. And a reverse rotation mechanism for switching. An engine is disposed in the upper portion of the outboard motor, and a propeller shaft and a reverse rotation mechanism are disposed in the lower portion of the outboard motor. Rotational power is transmitted from the engine to the reverse rotation mechanism by a drive shaft disposed substantially vertically.

  Lubricating oil is filled inside the gear box, and a lubricating oil path for circulating the lubricating oil is formed above the gear box. Then, the lubricating oil is supplied to gears and the like included in the reverse rotation mechanism by circulating the lubricating oil. In order to maintain the effect of lubrication with the lubricating oil, it is necessary to remove foreign matters such as wear powder contained in the lubrication.

  As a configuration for collecting foreign matter such as wear powder contained in the lubricating oil, there is a configuration in which a trap for the lubricating oil path is formed and a magnet is disposed inside the trap, as described in Patent Document 1, for example. . According to such a configuration, foreign matter such as wear powder contained in the lubricating oil can be adsorbed and removed by the magnet. However, the configuration described in Patent Document 1 has the following problems. First, with the configuration described in Patent Document 1, only foreign matter existing within the range covered by the magnetic force of the magnet can be recovered. For this reason, even if the foreign matter passes through the trap, the foreign matter that passes through a position away from the magnet cannot be adsorbed and removed. Moreover, in the structure of patent document 1, lubricating oil flows and passes through the inside of a trap. For this reason, if the flow rate of the lubricating oil is high, the foreign matter contained in the lubricating oil may pass through without being attracted to the magnet. Therefore, the foreign matter cannot be removed sufficiently. Furthermore, in the configuration of Patent Document 1, when a certain amount of foreign matter adheres to the magnet, the ability of the magnet to attract the foreign matter decreases. For this reason, there is little quantity of the foreign material which can be collect | recovered. Further, the foreign matter adsorbed on the magnet may be released from the magnet and again into the lubricating oil.

Japanese Utility Model Publication No. 05-086060

  In view of the above circumstances, the problem to be solved by the present invention is to use a magnet to attract and collect foreign matter such as wear powder contained in lubricating oil. This is to improve the efficiency of recovery. In addition, the problem to be solved by the present invention is to prevent foreign matter from being discharged into the path through which the lubricating oil circulates even when the foreign matter attracted by the magnet is separated from the magnet.

In order to solve the above-mentioned problem, the present invention is a foreign matter recovery structure for outboard motor lubricant having a reverse rotation mechanism for transmitting rotation of a drive shaft to a propeller shaft,
A guide surface provided in a path through which the lubricating oil circulates, and inclined at a predetermined angle with respect to the flow direction of the lubricating oil;
Provided in a path through which the lubricating oil circulates, and is formed in a cup shape having an opening through which the lubricating oil can flow in on the upstream side in the flow direction and closed on the downstream side, and the opening is formed in the guide surface A lubricating oil trap,
A magnet disposed inside the lubricating oil trap to adsorb foreign matter contained in the lubricating oil;
It is characterized by having.

  The magnet is entirely accommodated in the lubricating oil trap.

  The magnet is provided on the downstream side of the most upstream end of the flow direction in the guide surface.

  The shape of the outer peripheral surface of the magnet and the shape of the inner peripheral surface of the lubricating oil trap are substantially similar when viewed from the flow direction.

The present invention is a lubricating oil foreign matter recovery structure for an outboard motor having a reverse rotation mechanism for transmitting the rotation of the drive shaft to the propeller shaft,
A shift rod chamber in which a shift rod for operating the reverse rotation mechanism is housed;
A guide portion formed at a lower end portion of the shift rod chamber and having a guide surface inclined at a predetermined angle with respect to an axis of the shift rod;
A lubricant trap formed in a cup shape having an opening on the upper side and closed on the lower side, and the opening formed on the guide surface;
A magnet that is housed inside the lubricating oil trap and adsorbs foreign matter contained in the lubricating oil;
It is characterized by having.

  The magnet is entirely accommodated in the lubricating oil trap.

  The magnet is provided on the downstream side of the most upstream end of the flow direction of the lubricating oil on the guide surface.

  The shape of the outer peripheral surface of the magnet and the shape of the inner peripheral surface of the lubricating oil trap are substantially similar.

A lubricant supply passage for supplying lubricant to the shift rod chamber from the outside;
A lubricating oil flow path that allows the lubricating oil to flow through the reversing mechanism chamber in which the reversing mechanism is accommodated and the shift rod chamber;
Is further formed,
An upper end of the lubricating oil supply channel and one end of the lubricating oil channel are provided below the guide portion.

The guide portion overlaps one end of the lubricating oil passage in a plan view in the vertical direction, and a narrow portion through which the lubricating oil can flow is provided between the guide portion and the inner peripheral surface of the shift rod chamber. It is formed.

  According to the present invention, the foreign matter contained in the lubricating oil forms a trap that branches off from the flow path of the lubricating oil. According to such a configuration, the flow of the lubricating oil is small inside the trap and is in a so-called stagnant state. For this reason, foreign matters such as wear that have entered the trap are attracted to the magnet without flowing.

FIG. 1 is a side view showing a configuration of an outboard motor to which a foreign substance recovery structure according to an embodiment of the present invention is applied. FIG. 2 is a partial cross-sectional view schematically showing the internal structure of the outboard motor to which the foreign material recovery structure according to the embodiment of the present invention is applied. FIG. 3 is a cross-sectional view schematically showing the internal structure of the lower unit of the outboard motor, viewed from the left side. FIG. 4 is a cross-sectional view showing a portion where lubricating oil circulates from the lower unit of the outboard motor. FIG. 5 is a perspective view showing the configuration of the foreign matter recovery structure for lubricating oil according to the embodiment of the present invention, as seen from the upper left front side. FIG. 6 is a cross-sectional view schematically showing the configuration of the foreign matter recovery structure for lubricating oil according to the embodiment of the present invention, as viewed from the left side. FIG. 7 is a cross-sectional view schematically showing the configuration of the foreign matter recovery structure for lubricating oil according to the embodiment of the present invention, as viewed from above.

  Embodiments of the present invention will be described below in detail with reference to the drawings. For convenience of explanation, the outboard motor to which the lubricating oil recovery structure according to the embodiment of the present invention is applied is referred to as “outboard motor 1”. Further, the directions of “front”, “rear”, “right”, “left”, “upper”, and “lower” of the outboard motor 1 are based on the direction of the ship 9 on which the outboard motor 1 is mounted. The same applies to the orientation of each member constituting the outboard motor 1. In each figure, the front side of the outboard motor 1 is indicated by an arrow Fr, the rear side is indicated by an arrow Rr, the upper side is indicated by an arrow Tp, and the lower side is indicated by an arrow Bt.

  First, the overall configuration of the outboard motor 1 will be described with reference to FIGS. FIG. 1 is a side view schematically showing the configuration of the outboard motor 1 as viewed from the left side. FIG. 2 is a partial cross-sectional view schematically showing the configuration of the outboard motor 1 as viewed from the left side. FIG. 3 is a cross-sectional view schematically showing the internal structure of the lower unit 103 of the outboard motor 1, viewed from the left side. As shown in FIGS. 1 and 2, the outboard motor 1 is used with its front side fixed to a stern plate 91 (transam board) of the ship 9.

  The outboard motor 1 includes an engine unit 101 located on the uppermost side, a mid unit 102 located on the lower side, and a lower unit 103 located on the lowermost side. Cover members 17 and 18 are attached to the engine unit 101 and the mid unit 102, respectively. The devices arranged inside the engine unit 101 and the mid unit 102 are covered with the cover members 17 and 18.

  The engine unit 101 is provided with an engine 11 as a rotational power source. The engine 11 is supported by an engine base 12 provided at the lower part of the engine unit 101. The engine 11 is arranged in a posture in which the crankshaft is substantially vertical. For example, a V-type engine is applied to the engine 11. When a V-type engine is applied to the engine 11, for example, the crankshaft is positioned on the front side, and the cylinder and the piston are positioned on the rear side. An actuator 13 is arranged at the front lower part of the engine unit 101. The actuator 13 operates a reverse rotation mechanism 5 (described later) to switch the forward, reverse, and neutral of the outboard motor 1. The actuator 13 can rotate an upper shift rod 14 (described later) by a predetermined angle in both forward and reverse directions. In addition, the actuator 13 should just be an apparatus which can perform the said operation | movement, and a specific structure is not limited. Therefore, various known actuators can be applied. In addition, the engine unit 101 is provided with an engine control unit (ECU) for controlling the engine 11, an intake device for taking in combustion air, and the like (all not shown).

  The mid unit 102 accommodates a drive shaft 21, a cooling water tank 24, an oil pan 25 for lubricating oil, a cooling water pump 26, and the upper shift rod 14. The drive shaft 21 is arranged so that the axis is substantially vertical and penetrates the mid unit 102 in the vertical direction. The upper end portion of the drive shaft 21 is coupled to the crankshaft of the engine 11. The drive shaft 21 is rotated by the rotational power of the crankshaft of the engine 11 being transmitted. The lower end portion of the drive shaft 21 protrudes further from the lower side of the mid unit 102 and enters the lower unit 103. The water tank 24 is disposed adjacent to the rear side of the drive shaft 21 in the upper part of the mid unit 102. The oil pan 25 is disposed on the rear side of the water tank 24. A cooling water pipe 28 is drawn downward from the bottom of the water tank 24. The lower end of the cooling water pipe 28 is connected to the cooling water pump 26. The cooling water pump 26 is connected to an intake port 38 provided in the lower unit 103 via an intake pipe 37. The cooling water pump 26 sucks water from the outside through the water intake port 38 and the water intake pipe 37 and supplies the water to the water tank 24 through the cooling water pipe 28. The upper shift rod 14 is provided on the front side of the drive shaft 21 so as to be substantially parallel to the drive shaft 21 and rotatable on the mid unit 102. An upper end portion of the upper shift rod 14 is connected to the actuator 13, and a lower end portion of the upper shift rod 14 is connected to a lower shift rod 27 (described later) via a gear, for example. The upper shift rod 14 rotates by a predetermined angle in the front-rear direction by the operation of the actuator 13, and transmits the operation of the actuator 13 to the lower shift rod 27.

  In particular, as shown in FIG. 3, the lower unit 103 accommodates the lower part of the drive shaft 21, the propeller shaft 29, the lower shift rod 27, and the reverse rotation mechanism 5. The reverse rotation mechanism 5 is configured between the drive shaft 21 and the propeller shaft 29, and transmits the rotational power of the drive shaft 21 to the propeller shaft 29. Furthermore, the lower unit 103 is provided with a lubrication mechanism for lubricating the lower part of the drive shaft 21 and gears included in the reverse rotation mechanism 5. The lubrication mechanism has a path through which the lubricating oil circulates and a foreign matter collection structure 7 that collects foreign substances contained in the lubricating oil that circulates in the path. Details of the lubrication mechanism will be described later. Further, the lubrication mechanism for lubricating the lower portion of the drive shaft 21 and the reverse rotation mechanism 5 and the lubrication mechanism of the engine 11 itself are independent and independent. A propeller 39 for propulsion is attached to the rear end portion of the propeller shaft 29. In addition, a front side of the lower unit 103 is provided with a water intake port 38 for taking in cooling water and an oil drain hole 42 for supplying lubricating oil from the outside.

  As shown in FIG. 2, a pair of left and right upper mounts 15 are provided on the front edge portion of the engine base 12. In addition, a pair of left and right lower mounts 16 are provided at the front edge of the mid unit 102. The engine unit 101, the mid unit 102, and the lower unit 103 are supported by the upper mount 15 and the lower mount 16 so as to be integrally rotatable about the support shaft of the swivel bracket 19. As shown in FIG. 1, the engine unit 101 is provided with a steering handle 22 that protrudes forward. The boat operator can rotate the outboard motor 1 in a substantially horizontal direction around the support shaft of the swivel bracket 19 by operating the steering handle 22. As a result, the traveling direction of the ship 9 on which the outboard motor 1 is mounted can be controlled. Clamp brackets 20 are provided on the left and right sides of the swivel bracket 19. The clamp bracket 20 has a configuration that can be fixed to the stern plate 91 (transam board) of the ship 9. The clamp bracket 20 is supported so as to be rotatable about a tilt axis whose axis is directed in the left-right direction.

  Next, details of the configuration of the lower unit 103 will be described with reference to FIG. As shown in FIG. 3, the lower unit 103 has a housing 23. The casing 23 of the lower unit 103 is made of a metal such as an aluminum alloy, for example, and is manufactured by a die casting method or the like. A drive shaft chamber 717, a reverse rotation mechanism chamber 716, and a shift rod chamber 715 are formed inside the housing 23 of the lower unit 103. The drive shaft chamber 717 is a space in which the lower part of the drive shaft 21 is rotatably accommodated. The drive shaft chamber 717 has a configuration of a vertical hole whose axis is directed in the vertical direction, and is formed at a substantially center in the front-rear direction of the casing 23 of the lower unit 103. The reverse rotation mechanism chamber 716 is a space in which the propeller shaft 29 and the reverse rotation mechanism 5 are accommodated. The reversing mechanism chamber 716 has a configuration of a horizontal hole whose axis is directed in the front-rear direction, and is formed below the lower unit 103 and below the drive shaft chamber 717. The shift rod chamber 715 is a space in which the lower shift rod 27 is rotatably accommodated. The shift rod chamber 715 has a configuration of a vertical hole whose axis is directed in the vertical direction, and is formed on the front side of the drive shaft chamber 717 and substantially parallel to the drive shaft chamber 717. The lower end of the drive shaft chamber 717 communicates with an intermediate portion in the front-rear direction of the reverse rotation mechanism chamber 716. Further, the lower end of the shift rod chamber 715 communicates with the front end portion of the reverse rotation mechanism chamber 716.

  Two conical roller bearings 801 are disposed on the upper portion of the drive shaft chamber 717 in opposite postures. A radial bearing 803 is disposed below the drive shaft chamber 717 and immediately above the reverse rotation mechanism chamber 716. The lower portion of the drive shaft 21 accommodated in the drive shaft chamber 717 is rotatably supported by the two conical roller bearings 801 and the radial bearing 803.

  The reverse rotation mechanism 5 housed in the reverse rotation mechanism chamber 716 includes a drive gear 51, a forward gear 52, a reverse gear 53, a dog clutch 58, a connector rod 59, a shift slider 60, and lower ends of the lower shift rod 27. Part. The lower end portion of the drive shaft 21 enters the reverse rotation mechanism chamber 716. A drive gear 51 is provided at the lower end of the drive shaft 21. A bevel gear is applied to the drive gear 51. As the forward gear 52 and the reverse gear 53, a cylindrical bevel gear that penetrates in the front-rear direction is applied. The forward gear 52 and the reverse gear 53 are coaxial, are spaced apart from each other at a predetermined distance in the front-rear direction, and are disposed so that the teeth of the bevel gear face each other. As shown in FIG. 3, the forward gear 52 is disposed on the front side, and the reverse gear 53 is disposed on the rear side. The forward gear 52 and the reverse gear 53 are always meshed with the drive gear 51, and rotate in opposite directions by the rotation of the drive gear 51. Specifically, when rotation is transmitted from the engine 11, the forward gear 52 rotates to the right and the reverse gear 53 rotates to the left as viewed from the rear side. The forward gear 52 and the reverse gear 53 are rotatably supported by bearings (radial bearings 30 and 32 and thrust bearings 31 and 33), respectively. Furthermore, engaging portions (not shown) are formed on the surfaces of the forward gear 52 and the reverse gear 53 facing each other. The engaging portion has a configuration that can be engaged with an engaging portion (described later) of the dog clutch 58.

  The front portion of the propeller shaft 29 is accommodated inside the reverse rotation mechanism chamber 716 so that the axis is oriented in the front-rear direction. The front end portion of the propeller shaft 29 enters the inner periphery of the forward gear 52 and is rotatably supported by a conical roller bearing 34 disposed in front of or in the inner periphery of the forward gear 52. An intermediate portion of the propeller shaft 29 penetrates the inner periphery of the reverse gear 53 and is rotatably supported by a radial bearing 35 provided on the inner periphery of the reverse gear 53. The propeller shaft 29 is further rotatably supported by a radial bearing 36 disposed on the inner periphery of the reverse rotation mechanism chamber 716 at the rear thereof.

  A dog clutch 58 is disposed between the forward gear 52 and the reverse gear 53. The dog clutch 58 has a cylindrical configuration that penetrates in the front-rear direction, and is attached to the outer periphery of the propeller shaft 29. The dog clutch 58 can reciprocate in the front-rear direction (= the axial direction of the propeller shaft 29), but cannot rotate relative to the propeller shaft 29 and rotates integrally. An engagement portion (not shown) is formed at the front end portion and the rear end portion of the dog clutch 58. When the dog clutch 58 moves to the front side, the engaging portion formed at the front end engages with the engaging portion of the forward gear 52. Then, the forward gear 52 and the dog clutch 58 rotate together, and the rotation of the forward gear 52 is transmitted to the propeller shaft 29 via the dog clutch 58. On the other hand, when the dog clutch 58 moves rearward, the engaging portion formed at the rear end engages with the engaging portion formed at the reverse gear 53. Then, the dog clutch 58 rotates integrally with the reverse gear 53, and the rotation of the reverse gear 53 is transmitted to the propeller shaft 29 via the dog clutch 58. Further, when the dog clutch 58 is positioned between the forward gear 52 and the reverse gear 53, the engaging portion of the dog clutch 58 does not engage with any of the engaging portions of the forward gear 52 and the reverse gear 53. In this state, neither rotation of the forward gear 52 nor the reverse gear 53 is transmitted to the propeller shaft 29. That is, the reverse rotation mechanism 5 is in a neutral state.

  The front part of the propeller shaft 29 is formed hollow. And the connector rod 59 is arrange | positioned by the hollow part of the propeller shaft 29 so that a reciprocation is possible in the front-back direction. Further, the propeller shaft 29 is formed with an opening that communicates the outer periphery with the hollow portion inside. The rear end portion of the connector rod 59 and the dog clutch 58 are coupled by a pin member 61 or the like through this opening. A shift slider 60 is coupled to the front end portion of the connector rod 59. The shift slider 60 is a member that converts the rotational motion of the lower shift rod 27 into a reciprocating motion and reciprocates the dog clutch 58. The shift slider 60 is a rod-like member that is long in the front-rear direction. The shift slider 60 is formed with a long hole penetrating in the vertical direction and extending in the front-rear direction. Furthermore, a notch is formed in the side of this long hole. And the lower end part of the lower side shift rod 27 is loosely inserted in this long hole. The lower shift rod 27 is formed in a substantially rod shape and is rotatably accommodated in the shift rod chamber 715. A shift yoke that protrudes laterally is provided at the lower end of the lower shift rod 27. The lower end portion of the lower shift rod 27 is loosely inserted into the long hole of the shift slider 60. The shift yoke of the lower shift rod 27 engages with a notch formed on the side of the long hole of the shift slider 60 so as to fit.

  With such a configuration, when the actuator 13 operates and the upper shift rod 14 and the lower shift rod 27 rotate, the shift yoke slides the shift slider 60 in the front-rear direction. The dog clutch 58 moves to the front side or the rear side in conjunction with the shift slider 60. For this reason, forward rotation, reverse rotation, and neutral of the propeller shaft 29 can be switched.

  Next, the structure of the lubrication mechanism provided in the lower unit 103 will be described with reference to FIGS. FIG. 4 is a cross-sectional view showing a portion where the lubricating oil circulates from the lower unit 103 of the outboard motor 1. FIG. 5 is a perspective view showing a configuration of the foreign matter collecting structure 7 for the lubricating oil according to the embodiment of the present invention, as seen from the upper left front side. FIG. 6 is a cross-sectional view schematically showing a configuration of the lubricant foreign matter recovery structure 7 according to the embodiment of the present invention, as viewed from the left side. FIG. 7 is a cross-sectional view schematically showing the configuration of the foreign matter recovery structure 7 for lubricating oil according to the embodiment of the present invention, as viewed from above. The arrows in FIGS. 5 and 6 schematically show the flow of the lubricating oil. The lubrication mechanism provided in the lower unit 103 lubricates the meshing of each gear of the reverse rotation mechanism 5, each bearing, and the engaging portion of each other member, etc. by circulating lubricating oil. The lubrication mechanism provided in the lower unit 103 includes a path through which the lubricating oil circulates, a pump mechanism through which the lubricating oil circulates, and a foreign matter collection structure 7 provided in the path. The foreign substance recovery structure 7 is provided at the lower end of the shift rod chamber 715. Then, foreign matter such as wear powder contained in the lubricating oil flowing down the shift rod chamber 715 is collected.

  As shown in FIGS. 3 and 4, the shift rod chamber 715 and the reverse rotation mechanism chamber 716 have lubricating oil flowing through a first lubricating oil passage 711 and a second lubricating oil passage 712 having a through-hole configuration. Communicate as possible. One end (upper end) of the first lubricating oil passage 711 is provided in the vicinity of the lower end portion of the shift rod chamber 715. The other end (lower end) of the first lubricating oil passage 711 is the front end portion of the reverse rotation mechanism chamber 716 and is provided in the vicinity of the lower end portion of the lower shift rod 27 and the location where the shift slider 60 is accommodated. One end (front end) of the second lubricating oil passage 712 is provided in the vicinity of the lower end of the shift rod chamber 715 and in the vicinity of the upper end of the first lubricating oil passage 711. The other end (rear end) of the second lubricating oil passage 712 is an intermediate portion in the front-rear direction of the reverse rotation mechanism chamber 716 and is provided above the front side of the meshing position of the drive gear 51 and the forward gear 52.

  The reverse rotation mechanism chamber 716 and the drive shaft chamber 717 communicate with each other through a third lubricating oil passage 713 having a through-hole configuration so that the lubricating oil can flow. One end (lower end) of the third lubricating oil passage 713 is an intermediate portion in the front-rear direction of the reverse rotation mechanism chamber 716 and is provided above the rear side of the meshing position of the drive gear 51 and the reverse gear 53. The other end (upper end) of the third lubricating oil passage 713 is an intermediate portion in the vertical direction of the drive shaft chamber 717 and is provided directly above the radial bearing 803 that supports the drive shaft 21.

  The drive shaft chamber 717 and the shift rod chamber 715 are in fluid communication with each other through a fourth lubricating oil passage 714 having a through-hole configuration. One end (rear end) of the fourth lubricating oil passage 714 is provided above the two conical roller bearings 801 provided in the drive shaft chamber 717. The other end (front end) of the fourth lubricating oil channel 714 is provided above the shift rod chamber 715 and above the guide surface 702 (described later) of the guide portion 701.

  A spiral groove 802 is formed between the two conical roller bearings 801 on the outer peripheral surface of the drive shaft 21 and the radial bearing 803 provided below them. The spiral groove 802 functions as a lubricating oil pump that pumps up the lubricating oil from the lower side to the upper side as the drive shaft 21 rotates.

  The lubricating oil pumped up by the rotation of the drive shaft 21 passes around the two conical roller bearings 801 to lubricate them, and then flows into the fourth lubricating oil flow path 714. The lubricating oil that has flowed into the fourth lubricating oil flow path 714 flows down by its own weight and flows into the interior from the upper part of the shift rod chamber 715. The lubricating oil that has flowed into the shift rod chamber 715 flows downward and reaches the lubricating oil foreign material recovery structure 7 provided at the lower end of the shift rod chamber 715. Then, foreign matter such as wear powder is removed by the foreign matter collecting structure 7 for the lubricating oil. Thereafter, a part of the lubricating oil flows into the first lubricating oil passage 711 and the rest flows into the second lubricating oil passage 712. The lubricating oil that has passed through the first lubricating oil flow path 711 flows into the front end portion of the reverse rotation mechanism chamber 716 and lubricates the lower end portion of the lower shift rod 27 and the shift slider 60. The bearings (radial bearing 30 and thrust bearing 31) that flow backward and rotatably support the forward gear 52 and the conical roller bearing 34 that rotatably supports the propeller shaft 29 are lubricated. The lubricating oil that has passed through the second lubricating oil flow path 712 flows into the intermediate portion of the reverse rotation mechanism chamber 716 and lubricates the meshing portion between the drive gear 51 and the forward gear 52. Further, the lubricating oil that has flowed into the reverse rotation mechanism chamber 716 flows rearward, and meshes with the dog clutch 58, the drive gear 51 and the reverse gear 53, and a bearing (radial bearing) that rotatably supports the reverse gear 53. 32 and thrust bearing 33) are lubricated. Thereafter, the lubricating oil flows into the third lubricating oil flow path 713 and is sucked into the drive shaft chamber 717.

  With such a configuration, the lubricating oil filled in the lower unit 103 is the shift rod chamber 715, the first lubricating oil flow channel 711, the second lubricating oil flow channel 712, the reverse rotation mechanism chamber 716, and the third lubricating oil. The oil passage 713, the drive shaft chamber 717, the fourth lubricating oil passage 714, and the shift rod chamber 715 are circulated endlessly in the lower unit 103 in this order. That is, the shift rod chamber 715, the first lubricating oil passage 711, the second lubricating oil passage 712, the reverse rotation mechanism chamber 716, the third lubricating oil passage 713, the drive shaft chamber 717, and the fourth lubrication. The oil flow path 714 constitutes a path through which the lubricating oil circulates endlessly. In the path through which the lubricating oil circulates, a foreign matter collecting structure 7 for collecting foreign matters contained in the lubricating oil is provided near the lower end of the shift rod chamber 715. For this reason, before the lubricating oil circulating in the lower unit 103 flows into the reverse rotation mechanism chamber 716, foreign matters such as abrasion powder are removed by the foreign matter collecting structure 7. Therefore, the reverse rotation mechanism chamber 716 is supplied with clean lubricating oil from which foreign matter has been removed, and each gear, each bearing, and the like are lubricated with clean lubricating oil.

  In addition, the lower unit 103 is provided with an oil drain hole 42 for supplying lubricating oil from the outside and an oil level hole 43 for determining whether a specified amount of lubricating oil has been supplied from the outside. The oil drain hole 42 has a through-hole-like configuration, and in the vicinity of the front end portion of the lower unit 103, communicates between the front end portion of the reverse rotation mechanism chamber 716 and the outside so that lubricating oil can flow. The oil level hole 43 has a through-hole-like configuration, and communicates between the inside and the outside so that lubricating oil can flow at a predetermined height position of the shift rod chamber 715. The oil drain hole 42 and the oil level hole 43 are opened when lubricating oil is supplied, and the oil drain hole 42 and the oil level hole 43 are closed with screws, lids, and the like. The lubricating oil supplied from the outside through the oil drain hole 42 flows into the shift rod chamber 715 and the second lubricating oil flow path 712 through the first lubricating oil flow path 711. The lubricating oil that has passed through the second lubricating oil flow path 712 flows into the reverse rotation mechanism chamber 716. Thus, the first lubricating oil flow path 711 is a lubricating oil supply flow path for supplying lubricating oil to the shift rod chamber 715 from the outside. The lubricating oil that has flowed into the reverse rotation mechanism chamber 716 flows into the drive shaft chamber 717 through the third lubricating oil passage 713. When the supplied lubricating oil reaches a specified amount, the lubricating oil flows out through the oil level hole 43 provided in the shift rod chamber 715. As a result, it is possible to grasp that the supplied lubricating oil has reached the specified amount, and it is possible to prevent the lubricating oil exceeding the specified amount from being supplied.

  Next, details of the configuration of the foreign matter recovery structure 7 for the lubricating oil according to the embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 3 and 4, one end (upper end) of the first lubricating oil passage 711 is located near the lower end of the shift rod chamber 715. The other end (lower end) of the first lubricating oil passage 711 is located above the front end of the reverse rotation mechanism chamber 716. One end (front end) of the second lubricating oil passage 712 is located in the vicinity of the lower end portion of the shift rod chamber 715 and one end (upper end) of the first lubricating oil passage 711. The other end (rear end) of the second lubricating oil passage 712 is an intermediate portion in the front-rear direction of the reverse rotation mechanism chamber 716 and is located in front of the meshing position of the forward gear 52 and the drive gear 51. The lubricating oil foreign material recovery structure 7 according to the embodiment of the present invention is provided at the lower end of the shift rod chamber 715. As shown in FIGS. 5 to 7, the foreign matter recovery structure 7 for a lubricating oil according to an embodiment of the present invention includes a guide portion 701 that guides the flow of the lubricating oil, a lubricating oil trap 703 into which the lubricating oil can flow, And a magnet 704 that adsorbs foreign matter such as wear powder contained in the lubricating oil.

  The guide portion 701 uses the lubricant that has flowed down inside the shift rod chamber 715 as the lubricant foreign matter recovery structure 7 according to the embodiment of the present invention, the first lubricant channel 711, and the second lubricant channel 712. Has the function of leading to A guide surface 702 is formed on the upper side of the guide portion 701. The guide surface 702 is an inclined surface that inclines backward and downward. That is, the guide surface 702 is an inclined surface that is inclined at a predetermined angle with respect to the flow direction (= vertical direction) of the lubricating oil inside the shift rod chamber 715. And as for the guide surface 702 and the guide part 701, the front-end part is the highest and the rear-end part is the lowest. The rear end portion of the guide portion 701 has a plate-like or bowl-like configuration projecting obliquely downward on the rear side. Therefore, the lubricating oil that has flowed down inside the shift rod chamber 715 has its flow direction changed by the guide surface 702 formed in the guide portion 701, and is guided obliquely downward on the rear side.

  With such a configuration, the lubricating oil flowing down the shift rod chamber 715 is guided rearward and obliquely downward by the guide surface 702 of the guide portion 701, and the rear end portion of the guide portion 701 and the inner peripheral surface of the shift rod chamber 715. It flows into the narrow part 706 that is a gap between the two. A part of the lubricating oil that has flowed into the narrow portion 706 flows into the second lubricating oil flow path 712, and the rest flows into the first lubricating oil flow path 711. The lubricating oil that has passed through the first lubricating oil flow path 711 flows into the vicinity of the front end portion of the reverse rotation mechanism chamber 716. On the other hand, the lubricating oil that has passed through the second lubricating oil flow path 712 flows into the intermediate portion of the reverse rotation mechanism chamber 716.

  The guide portion 701 is provided with a lubricating oil trap 703. The lubricating oil trap 703 has a depth from the guide surface 702 toward the lower side (= the downstream side in the flow direction of the lubricating oil), and an opening is formed on the upper side (= the upstream side in the flow direction of the lubricating oil). It has a cup-shaped configuration. An opening on the upper side of the lubricant trap 703 is formed in the guide surface 702. A through hole is formed in the bottom surface of the lubricating oil trap 703, and the lower shift rod 27 penetrates the inside of the lubricating oil trap 703. The through hole formed in the bottom surface of the lubricating oil trap 703 is closed by the lower shift rod 27, and is configured so that the lubricating oil does not flow through the through hole. Thus, the lubricating oil trap 703 as a whole has an opening that allows the lubricating oil to flow into the upper side, and has a cup-shaped configuration that closes the lower side so that the lubricating oil cannot substantially pass therethrough.

  Inside the lubricating oil trap 703, a magnet 704 for adsorbing foreign matter such as wear powder contained in the lubricating oil is provided. The magnet 704 has a cylindrical configuration and is attached to the outer periphery of the lower shift rod 27. Further, the magnet 704 is entirely accommodated inside the lubricating oil trap 703 and is arranged in such a manner that it does not protrude outside. Specifically, as shown particularly in FIG. 6, the upper end of the magnet 704 is positioned below the guide surface 702 when viewed from the side. That is, a portion of the guide surface 702 on the upstream side (= upper side) in the flow direction of the lubricating oil from the lubricating oil trap 703 functions as an introduction portion for introducing the lubricating oil into the lubricating oil trap 703. The magnet 704 is located downstream of the introduction portion in the direction of lubricant flow. In particular, the magnet 704 is located on the downstream side of the position of the guide surface 702 on the most upstream side in the flow direction of the lubricating oil (= the upper end of the guide surface, the upstream end of the introduction portion).

  In particular, as shown in FIG. 7, when viewed from above (= viewed from the flow direction of the lubricating oil), the shape of the outer peripheral surface of the magnet 704 and the shape of the inner peripheral surface of the lubricating oil trap 703 are formed to be substantially similar. . A gap having substantially uniform dimensions is formed between the outer peripheral surface of the magnet 704 and the inner peripheral surface of the lubricant trap 703 over the entire length in the circumferential direction. For example, a configuration in which the magnet 704 is formed in a substantially cylindrical shape, the inner peripheral surface of the lubricating oil trap 703 is formed in a vertical hole shape with a substantially circular cross section, and the magnet 704 is disposed coaxially with the lubricating oil trap 703 is applied. it can. 5 to 7 show a configuration in which the inner diameter of the lubricating oil trap 703 decreases as it goes downward, but the inner diameter may be uniform over the entire length. Furthermore, the shape of the outer peripheral surface of the magnet 704 and the inner peripheral surface of the lubricating oil trap 703 when viewed from above is not limited to a substantially circular shape. For example, it may be a polygon such as a rectangle. The point is that the gap between the outer peripheral surface of the magnet 704 and the inner peripheral surface of the lubricant trap 703 may be a substantially uniform configuration along the circumferential direction of the lower shift rod 27. That is, the distance between the outer peripheral surface of the magnet 704 and the inner peripheral surface of the lubricant trap 703 may be within a distance that the magnetic force of the magnet 704 reaches.

  According to such a configuration, the foreign matter contained in the lubricating oil settles on the guide surface 702 and the lubricating oil trap 703 due to the flow of the lubricating oil and its own weight when the lubricating oil flows down the shift rod chamber 715. The foreign matter settled on the guide surface 702 moves rearward and obliquely downward along the guide surface 702 due to the flow of the lubricating oil and its own weight. Since the front end portion of the guide surface 702 is at the highest position, when the foreign matter moves along the upper surface of the guide surface 702, it sinks into the lubricant trap 703. The foreign matter settled inside the lubricating oil trap 703 is attracted to the magnet 704 and collected. In this way, the foreign matter contained in the lubricating oil is collected by the guide surface 702 formed in the guide portion 701, the lubricating oil trap 703, and the magnet 704.

  The lubricating oil trap 703 branches off from the path through which the lubricating oil circulates and has a dead end configuration. With such a configuration, the lubricating oil flowing into the inside from the opening is reversed inside the lubricating oil trap 703 and flows out from the opening. For this reason, inside the lubricating oil trap 703, the flow rate of the lubricating oil is smaller than that of the other part (path through which the lubricating oil circulates), and the lubricating oil is in a so-called “stagnation state”. Therefore, in the lubricating oil trap 703, the moving speed of the foreign matter is reduced, so that it is easily attracted by the magnet 704. Further, when the foreign matter is attracted to the magnet 704 and then separated, the foreign matter separated from the magnet 704 sinks to the bottom of the lubricating oil trap 703 by its own weight. In this way, the foreign matter that has settled in the lubricating oil trap 703 does not flow out of the opening. For this reason, the foreign material away from the magnet 704 is not released to the route through which the lubricating oil circulates.

  That is, in the conventional configuration in which the magnet 704 is disposed in the flow of lubricating oil, the speed of the foreign matter passing through the vicinity of the magnet 704 is high, so that the foreign matter may not be attracted. Furthermore, if the foreign matter is not attracted while passing in the vicinity of the magnet 704, the foreign matter circulates as it is contained in the lubricating oil. Further, the foreign matter adsorbed on the magnet 704 is easily separated from the magnet 704 because it is exposed to the circulation flow of the lubricating oil. And the foreign material which left | separated from the magnet 704 flows through the inside of the path | route through which lubricating oil circulates again. As described above, the configuration in which the magnet 704 is disposed in the flow through which the lubricating oil circulates has a low effect of adsorbing foreign matter and an effect of preventing the adsorbed foreign matter from drifting away from the magnet 704 again. On the other hand, according to the foreign matter recovery structure 7 for the lubricating oil according to the embodiment of the present invention, these problems can be solved, the effect of adsorbing the foreign matter contained in the lubricating oil, and the adsorbed foreign matter The effect of preventing drifting away from the magnet 704 again can be improved.

  Next, the relationship between the lubricating oil foreign material recovery structure 7 according to the embodiment of the present invention, the first lubricating oil flow path 711 and the second lubricating oil flow path 712 will be described with reference to FIGS. . In particular, as shown in FIGS. 5 and 6, the upper end of the first lubricating oil passage 711 is located below the shift rod chamber 715. The shift rod chamber 715 and the first lubricating oil flow path 711 are partitioned by the guide portion 701. In particular, as shown in FIG. 6, the rear end portion of the inner peripheral surface of the first lubricating oil flow path 711 is positioned in front of the rear end portion of the inner peripheral surface of the shift rod chamber 715 in a side view. Then, a step surface 705 that faces substantially upward is formed between the rear end portion of the inner peripheral surface of the first lubricating oil passage 711 and the rear end portion of the inner peripheral surface of the shift rod chamber 715. An opening at one end of the second lubricating oil passage 712 is formed in the step surface 705. The rear end portion of the guide portion 701 is provided at a position spaced apart from the step surface 705 by a predetermined distance. In particular, as shown in FIG. 7, a part of the rear end portion of the guide portion 701 is an inner peripheral surface of the shift rod chamber 715 and an inner peripheral surface of the first lubricating oil channel 711 in a plan view from the up and down direction. Is superimposed on the step surface 705 between the two. Further, the rear end portion of the guide portion 701 and the rear end portion of the inner peripheral surface of the shift rod chamber 715 are separated from each other by a predetermined distance. A narrow portion 706 through which lubricating oil can flow is formed between the rear end portion of the guide portion 701 and the inner peripheral surface and step surface 705 of the shift rod chamber 715. The cross-sectional area of the narrow portion 706 is smaller than the cross-sectional areas of the shift rod chamber 715 and the first lubricating oil channel 711. Thus, the shift rod chamber 715 and the first lubricating oil flow path 711 communicate with each other through the narrowed portion 706 so that the lubricating oil can flow. Further, the shift rod chamber 715 and the second lubricating oil flow path 712 also communicate with each other through the narrowed portion 706 so that the lubricating oil can flow. On the other hand, the upper end of the first lubricating oil passage 711 and the front end of the second lubricating oil passage 712 communicate with each other so that the lubricating oil can flow directly without passing through the narrow portion 706. That is, the opening on the front end side of the second lubricating oil passage 712 is formed in the vicinity of the upper end portion of the inner peripheral surface of the first lubricating oil passage 711.

  Here, the mode of flow of the lubricating oil when the lubricating oil is supplied from the outside will be described. Lubricating oil is supplied to the inside through an oil drain hole 42 formed near the front end of the lower unit 103. First, the lubricating oil flows into the vicinity of the front end portion of the reverse rotation mechanism chamber 716 through the oil drain hole 42 (= the vicinity of the portion where the lower end portion of the lower shift rod 27 and the shift slider 60 are accommodated). The lubricating oil that has flowed into the vicinity of the front end portion of the reverse rotation mechanism chamber 716 rises in the first lubricating oil passage 711 as a lubricating oil supply passage from the lower end toward the upper end. The upper end of the first lubricating oil passage 711 and the lower end of the shift rod chamber 715 are partitioned by a guide portion 701. For this reason, the lubricating oil that has reached the upper end of the first lubricating oil flow path 711 is guided by the guide portion 701 so as to flow toward the rear side. Therefore, a part of the lubricating oil flows into the second lubricating oil flow path 712 and the rest of the lubricating oil passes through the narrow portion 706 between the guide portion 701, the step surface 705 and the inner peripheral surface of the shift rod chamber 715. Flow into 715. Note that the lower arrow in FIG. 6 schematically shows the lubricating oil flowing from the first lubricating oil passage 711 into the second lubricating oil passage 712. The cross-sectional area of the narrow portion 706 is smaller than the cross-sectional areas of the first lubricating oil passage 711 and the shift rod chamber 715. For this reason, the narrow portion 706 becomes a resistance to the flow of the lubricating oil, and limits the amount of the lubricating oil flowing into the shift rod chamber 715. Therefore, as compared with a configuration in which the narrowed portion 706 is not formed, the amount of lubricating oil flowing into the second lubricating oil passage 712 can be increased, and the amount of lubricating oil flowing into the shift rod chamber 715 can be decreased. According to such a configuration, when the lubricating oil is supplied, the oil level of the lubricating oil that has flowed into the shift rod chamber 715 flows into the drive shaft chamber 717 through the reverse rotation mechanism chamber 716 and the reverse rotation mechanism chamber 716. It is possible to prevent the oil level from becoming higher.

  That is, when the guide portion 701 and the narrow portion 706 are not provided, the lubricating oil that has risen in the first lubricating oil passage 711 flows directly into the shift rod chamber 715 without being restricted in flow. When the cross-sectional area of the second lubricating oil passage 712 is smaller than the cross-sectional area of the shift rod chamber 715, the amount of lubricating oil flowing into the reverse rotation mechanism chamber 716 through the second lubricating oil passage 712 flows into the shift rod chamber 715. The amount of lubricating oil to be reduced is small. In particular, the difference in this amount increases as the viscosity of the lubricating oil increases. Then, when the lubricating oil is supplied, the oil level of the lubricating oil flowing into the shift rod chamber 715 becomes higher than the oil level of the lubricating oil flowing into the drive shaft chamber 717 through the reverse rotation mechanism chamber 716. . As described above, when the lubricating oil overflows from the oil level hole 43, it is determined that the specified amount of lubricating oil has been supplied to the casing 23 of the lower unit 103. For this reason, at the time of supply, if the oil level of the lubricating oil flowing into the shift rod chamber 715 becomes higher than the oil level of the lubricating oil flowing into the drive shaft chamber 717, the specified amount of lubricating oil is supplied. First, the lubricating oil overflows from the oil level hole 43. Then, there is a possibility that it may be erroneously determined that the specified amount of lubricating oil has been supplied even though the supplied lubricating oil is less than the specified amount. As a result, the lubricating oil is insufficient, and there is a possibility that the gears and the bearings are not sufficiently lubricated.

  On the other hand, according to the embodiment of the present invention, the guide portion 701 and the narrow portion 706 formed between the first lubricant passage 711 and the shift rod chamber 715 are separated from the first lubricant passage 711. The amount of lubricating oil flowing into the shift rod chamber 715 is regulated, and guidance is performed so that the lubricating oil flows into the second lubricating oil passage 712. For this reason, the oil level of the lubricating oil flowing into the shift rod chamber 715 is prevented from becoming higher than the oil level of the lubricating oil flowing into the drive shaft chamber 717. Therefore, since the said problem is eliminated, it is prevented that the supply amount of lubricating oil becomes too small, and each gear, each bearing, etc. can be lubricated appropriately.

  As mentioned above, although embodiment of this invention was described in detail, the said embodiment is only what showed the example of actualization in implementing this invention. The technical scope of the present invention should not be construed as being limited by the embodiment. That is, the present invention can be implemented in various forms without departing from the technical idea or the main features thereof.

  The present invention is a technique effective for a foreign matter recovery structure for lubricating oil of an outboard motor. In addition, this technique is effective not only for outboard motors but also for foreign matter recovery structures for lubricating oil in various machines.

1: Outboard motor according to an embodiment of the present invention, 5: reverse rotation mechanism, 51: drive gear, 52: forward gear, 53: reverse gear, 27: lower shift rod, 7: foreign matter recovery structure for lubricating oil, 701 : Guide part, 702: Guide surface, 703: Lubricating oil trap, 704: Magnet, 705: Stepped surface, 706: Narrow part, 711: First lubricating oil path, 712: Second lubricating oil path, 713: Third lubricating Oil path, 714: fourth lubricating oil passage, 715: shift rod chamber, 716: reverse rotation mechanism chamber, 717: drive shaft chamber

Claims (10)

Foreign matter recovery structure for outboard motor lubricating oil having a reverse rotation mechanism that transmits the rotation of the drive shaft to the propeller shaft,
A guide surface provided in a path through which the lubricating oil circulates, and inclined at a predetermined angle with respect to the flow direction of the lubricating oil;
Provided in a path through which the lubricating oil circulates, and is formed in a cup shape having an opening through which the lubricating oil can flow in on the upstream side in the flow direction and closed on the downstream side, and the opening is formed in the guide surface A lubricating oil trap,
A magnet disposed inside the lubricating oil trap to adsorb foreign matter contained in the lubricating oil;
A foreign matter recovery structure for lubricating oil of an outboard motor, comprising:   The foreign matter recovery structure for outboard motor lubricant according to claim 1, wherein the magnet is entirely accommodated in the lubricant trap.   3. The foreign matter recovery structure for an outboard motor lubricant according to claim 1, wherein the magnet is provided on a downstream side of an end portion on the most upstream side in the flow direction on the guide surface.   The shape of the outer peripheral surface of the said magnet and the shape of the inner peripheral surface of the said lubricant trap are substantially similar seeing from the said flow direction, The ship of any one of Claim 1 to 3 characterized by the above-mentioned. Foreign matter recovery structure for external unit lubricant. Foreign matter recovery structure for outboard motor lubricating oil having a reverse rotation mechanism that transmits the rotation of the drive shaft to the propeller shaft,
A shift rod chamber in which a shift rod for operating the reverse rotation mechanism is housed;
A guide portion formed at a lower end portion of the shift rod chamber and having a guide surface inclined at a predetermined angle with respect to an axis of the shift rod;
A lubricant trap formed in a cup shape having an opening on the upper side and closed on the lower side, and the opening formed on the guide surface;
A magnet that is housed inside the lubricating oil trap and adsorbs foreign matter contained in the lubricating oil;
A foreign matter recovery structure for lubricating oil of an outboard motor, comprising:   6. The outboard motor lubricant recovery structure according to claim 5, wherein the magnet is entirely accommodated in the lubricant trap.   7. The foreign matter recovery of the outboard motor lubricant according to claim 5, wherein the magnet is provided on the downstream side of the most upstream end of the guide surface in the flow direction of the lubricant. Construction.   8. The foreign matter in the outboard motor lubricant according to claim 5, wherein the shape of the outer peripheral surface of the magnet and the shape of the inner peripheral surface of the lubricant trap are substantially similar. Collection structure. A lubricant supply passage for supplying lubricant to the shift rod chamber from the outside;
A lubricating oil flow path that allows the lubricating oil to flow through the reversing mechanism chamber in which the reversing mechanism is accommodated and the shift rod chamber;
Is further formed,
The outboard motor lubricating oil according to any one of claims 5 to 8, wherein an upper end of the lubricating oil supply channel and one end of the lubricating oil channel are provided below the guide portion. Foreign matter recovery structure. The guide portion overlaps one end of the lubricating oil passage in a plan view in the vertical direction, and a narrow portion through which the lubricating oil can flow is provided between the guide portion and the inner peripheral surface of the shift rod chamber. The foreign matter recovery structure for an outboard motor lubricating oil according to claim 9, which is formed.

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