JP4993553B2 - Outboard motor - Google Patents

Description

  The present invention relates to an outboard motor in which a case supported by a hull is divided into an upper case and a lower case, and the upper case and the lower case in a combination of an upper case and a drive side member are detachable from each other. It is.

  Conventionally, the above-described outboard motor is disclosed in Patent Document 1 below. According to this publication, the outboard motor includes a cast case that extends in a substantially vertical direction and can be supported on the hull side, an engine supported by the upper end of the case, and an interior of the lower end of the case. A propeller shaft that is housed in the space and supported by the case so as to be rotatable around a substantially horizontal first axis, a propeller supported by the propeller shaft, and a substantially vertical second axis. The drive shaft is supported by the case so that its upper end is interlocked with the engine, the drive gear is housed in the internal space and is supported by the lower end of the drive shaft, and the internal space. And a driven gear which is connected to the propeller shaft and meshes with the drive gear. The case is divided into an upper case and a lower case, and the upper case and the lower case are detachably coupled to each other.

  The upper case supports the upper portion of the drive shaft, and the lower case supports the propeller shaft, the lower portion of the drive shaft, the drive gear, and the driven gear. The lower end portion of the drive shaft and the drive gear supported by the lower end portion are accommodated in a recess formed in the upper inner surface of the internal space.

  The case is generally die cast. During this casting operation, usually, first, a core corresponding to the internal space and a kind of abandoned core called a loose piece corresponding to the recess are installed in the outer mold to mold a mold. The Next, molten metal is cast into the mold, and then cooled and solidified, and the casting is taken out from the outer mold together with the cores. Next, both the cores are taken out from the inside of the casting. In this way, the case is cast.

  On the other hand, when assembling the outboard motor, usually, the upper and lower cases are first coupled to each other, and a drive shaft is assembled to the upper and lower cases. Next, the drive gear is inserted into the recess through the inner space of the lower end portion of the case, and is assembled to the lower end portion of the drive shaft. Next, the propeller shaft and the driven gear assembled to each other are fitted into the internal space, and the propeller shaft is supported by the lower end portion of the case so that the driving and driven gears mesh with each other. In this way, the assembly work of the outboard motor is performed.

JP-A-8-34394

  By the way, in the casting operation of the case, the installation operation of the core inside the outer mold and the extraction operation of the core from the inside of the casting can be mechanically performed by a robot or the like. However, it is difficult to mechanize the installation and removal work of the abandoned core because it requires skill. Therefore, these work is assumed to be complicated manual work. It is complicated.

  On the other hand, the internal space at the lower end of the case is narrow. For this reason, in the assembly work of the outboard motor, the work of fitting the drive gear into the recess through the internal space and assembling the drive gear to the lower end portion of the drive shaft is complicated. As a result, the assembly work of the outboard motor is complicated.

  The present invention has been made paying attention to the above situation, and an object of the present invention is to facilitate the casting operation of a case constituting the outer shell of the outboard motor, and It is to make assembly work easy.

According to the first aspect of the present invention, a case 10 that extends in a substantially vertical direction and can be supported on the hull 3 side, and is accommodated in an internal space 12 at the lower end of the case 10, rotates around a substantially horizontal first axis 13. The propeller shaft 16 supported by the case 10 so as to be capable of being supported, and the case 10 being supported so as to be rotatable around the substantially vertical second axis 31, and the upper end portion thereof being interlocked and coupled to the engine 11. A drive shaft 34, a drive gear 37 received in the internal space 12 and supported by the lower end of the drive shaft 34, and a drive gear 37 received in the internal space 12, connected to the propeller shaft 16, and connected to the drive gear 37 and a driven gear 39 which meshes, on the case 10, to divide the lower case 43, on these, the outboard motor and detachably mountable to the lower case 43 to each other,
On the, in mutual detachment condition of the lower case 42 and 43, on these, among the lower case 42 and 43, by Rukoto the drive shaft 34 only in the upper case 42 is supported, these upper case 42, the drive shaft 34, and the drive gear 37 is a combination member 73 which is combined integrally, and the upper casing 42 in this combination 73, in which the aforementioned lower case 43 are detachably coupled to each other.

  According to a second aspect of the present invention, in addition to the first aspect of the present invention, a cylindrical protrusion 59 that protrudes downward and accommodates the drive gear 37 is formed in the lower portion of the upper case 42, and the inner space is formed. 12, a circular hole 61 is formed in the lower case 43 so that the drive gear 37 is inserted together with the cylindrical protrusion 59.

  According to a third aspect of the present invention, in addition to the first aspect of the invention, the drive and driven gears 37 and 39 have the same shape and the same size.

According to a fourth aspect of the present invention, in addition to the second aspect of the present invention, when the axial direction of the propeller shaft 16 is the front-rear direction, before the upper and lower cases 42 and 43 are coupled to each other, the rear fastener 63, 64, the front fastener 63 is disposed in front of the circular hole 61, and the rear fastener 64 is disposed behind the circular hole 61.

  In this section, the reference numerals appended to the above terms are not to be construed as limiting the technical scope of the present invention to the section “Example” described later or the contents of the drawings.

  The effects of the present invention are as follows.

The invention of claim 1 is a case that extends in a substantially vertical direction and can be supported on the hull side, and is housed in an internal space at the lower end of the case, so that it can rotate around a substantially horizontal first axis. A propeller shaft supported by the case, a drive shaft supported by the case so as to be rotatable about a substantially vertical second axis, and an upper end portion of which is interlocked with the engine; A drive gear supported by the lower end of the drive shaft, and a driven gear housed in the internal space and coupled to the propeller shaft and meshing with the drive gear, and the case is divided into an upper case and a lower case In these outboard motors, the upper and lower cases can be attached to and detached from each other.
On the, in mutual detachment condition of the lower case, on those among the lower case, the Rukoto the drive shaft only in the upper case is supported, these upper case, the drive shaft, and the drive gear combined integrally It is a is combination thereof, and the upper case in the combination thereof, and the said lower case are detachably coupled to each other.

  For this reason, in the prior art, the lower end portion of the drive shaft and the drive gear supported by the lower end portion are accommodated in the recess formed in the upper inner surface of the internal space. For example, in the portion corresponding to the recess, the case is divided into an upper case and a lower case, and the portion corresponding to the recess in the internal space of the lower case is open to the outside of the lower case.

  Therefore, since there is no recess in the inner surface of the internal space, when the lower case of the case is made of cast, a casting core corresponding to the recess is provided in the mold in the casting operation of the lower case. Is not necessary, and in accordance with this, it is not necessary to perform the operation of installing the discarded core in the mold and the operation of taking it out of the casting. As a result, the case can be easily cast.

  Further, according to the above configuration, in the assembly work of the outboard motor, first, in the wide work space, by supporting the drive shaft only in the upper case among the upper and lower cases, the upper case, the drive The shaft and the drive gear are integrally combined to form a combined body, and then the upper case and the lower case in the combined body may be coupled to each other.

  Therefore, in the assembly work of the outboard motor, the drive gear is inserted into a recess formed in the inner surface of the internal space through a narrow internal space as in the prior art, and the drive gear is inserted into the drive shaft. The troublesome work of assembling to the lower end of the is not necessary. As a result, the outboard motor can be easily assembled.

  According to a second aspect of the present invention, a cylindrical projection that protrudes downward and accommodates the drive gear is formed in a lower portion of the upper case, and constitutes a part of the inner space together with the cylindrical projection. A circular hole into which the drive gear is fitted is formed in the lower case.

  For this reason, in the assembly work of the outboard motor, the cylindrical protrusion is closely fitted into the circular hole before the upper case and the lower case in the combined body are coupled to each other as described above. For example, the relative positioning of the drive gear and the driven gear supported by the lower case can be automatically performed with high accuracy, and the engagement between the drive gear and the driven gear can be achieved with high accuracy. Therefore, in the assembling work of the outboard motor, the assembling work of the outboard motor can be more easily performed because it is not necessary to pay attention to the meshing accuracy between the drive gear and the driven gear.

  According to a third aspect of the present invention, the drive and driven gears have the same shape and size.

  For this reason, the types of the number of parts of the outboard motor can be reduced, and these parts can be easily managed. Therefore, the assembly work of the outboard motor is further facilitated in this respect.

  According to a fourth aspect of the present invention, when the axial direction of the propeller shaft is the front-rear direction, a rear fastener is provided before the upper and lower cases are coupled to each other, and the front fastener is disposed in front of the circular hole. The rear fastener is disposed behind the circular hole.

  For this reason, it is prevented that the width dimension of the joint part of the upper and lower cases in the case is increased by the front and rear fasteners. Therefore, the width dimension of the case can be suppressed to be small, and the resistance at the time of propulsion of the ship can be reduced.

  The present invention relates to an outboard motor in order to achieve the object of facilitating the casting operation of the case constituting the outer shell of the outboard motor and facilitating the assembly operation of the outboard motor. The best mode for carrying out the present invention is as follows.

  That is, the outboard motor is accommodated in an inner space of a case that extends in a substantially vertical direction and can be supported on the hull side, an engine that is supported on the upper end of the case, and a lower end of the case. A propeller shaft supported by the case so as to be rotatable about one axis, a propeller supported by the propeller shaft, and supported by the case so as to be rotatable about a substantially vertical second axis. A drive shaft whose upper end is linked to the engine, a drive gear housed in the internal space and supported by the lower end of the drive shaft, and housed in the internal space and coupled to the propeller shaft. And a driven gear meshing with the drive gear.

On the above case, it is divided into the lower case, on these, the lower case is that is detachable from each other. This lower case is made of casting. On the, in mutual detachment condition of the lower case, on those among the lower case, the Rukoto the drive shaft only in the upper case is supported, these upper case, the drive shaft, and the drive gear is combined integrally The upper case and the lower case in the combination are detachably coupled to each other.

  In order to explain the present invention in more detail, an embodiment thereof will be described with reference to the accompanying drawings.

  In FIG. 1, reference numeral 1 is a ship floating on the water surface 2, and an arrow Fr indicates the forward direction of the ship 1 in the propulsion direction.

  The ship 1 includes a hull 3 and an outboard motor 5 supported by a horizontal plate 4 provided on the hull 3 side. The outboard motor 5 includes an outboard motor main body 7 that generates propulsive force and can propel the hull 3 forward, and a bracket 8 that supports the outboard motor main body 7 on the horizontal plate 4. .

  In FIG. 1-7, the outboard motor main body 7 includes an aluminum alloy cast case 10 that extends in a substantially vertical direction and can be supported on the hull 3 side by the bracket 8, and an upper end portion side of the case 10. The front and rear bearings 14 and 15 are supported by an engine 11 to be supported and the front and rear bearings 14 and 15 so that the engine 11 is accommodated in the internal space 12 at the lower end portion of the case 10 and can be rotated about a substantially horizontal first axis 13 extending in the longitudinal direction of the hull 3. The propeller shaft 16 supported by the case 10, the propeller 18 supported by a fastener 17 at the rear portion of the propeller shaft 16 protruding rearward from the lower end portion of the case 10, and the first axis 13, An annular seal body 19 is provided between the inner peripheral surface of the rear end in the inner space 12 at the lower end of the case 10 and the outer peripheral surface of the propeller shaft 16.

  The engine 11 is a four-cycle single-cylinder air-cooled internal combustion engine. The engine 11 includes a crankcase 24 that supports a crankshaft 23 that has a substantially vertical shaft center 22, and an oil pan 26 that is attached to the crankcase 24 and stores lubricating oil 25 so as to close a lower end opening of the crankcase 24. And. A lower end portion of the crankshaft 23 is supported on the oil pan 26 by a bearing 27.

  The outboard motor main body 7 is accommodated in an internal space 30 in the middle of the case 10 in the longitudinal direction, and can be rotated around a substantially vertical second axis 31 by upper bearings 32 and 33. A planetary gear type reduction device that is interposed between the drive shaft 34 supported by the case 10 and the upper end portion of the case 10 and the engine 11 and interlocks the drive shaft 34 with the lower end portion of the crankshaft 23. 35, a bevel gear type drive gear 37 received in the inner space 12 at the lower end portion of the case 10 and fitted and supported by the lower end portion of the drive shaft 34 by spline teeth 36, and received in the inner space 12, A propeller shaft 16 is provided with a driven gear 39 fitted and connected to the front end portion (free end portion) of the propeller shaft 16 by spline teeth 38.

  The second axis 31 is coaxial with the axis 22 of the crankshaft 23 and is orthogonal to the first axis 13. The drive gear 37 and the driven gear 39 have the same shape and the same size, and are compatible.

  The case 10 is divided into upper and lower cases 42 and 43. The upper case 42 includes an extruded product 44 that constitutes a middle portion in the longitudinal direction and extends in a substantially vertical direction, an upper member 46 that is coupled to the upper end portion of the extruded product 44 by a coupler 45, and the extrusion molding. A lower member 48 coupled to a lower end portion of the product 44 by a coupling tool 47 is provided.

  More specifically, the extruded product 44 is made of an aluminum alloy, the upper and lower members 46 and 48 are made of an aluminum alloy, and the couplers 45 and 47 are rivets. The extruded product 44 has an elliptical cylindrical shape in which the cross section of each part in the longitudinal direction is long in the longitudinal direction of the ship 1. The lower portion of the extruded product 44 is immersed below the water surface 2.

  The upper member 46 is located on the second axis 31 and is integrally formed with a cylindrical upper member body 51 supported on the hull 3 side by the bracket 8 and an upper end portion of the upper member body 51. The outward flange 52, the outward flange 53 formed integrally with the lower end portion of the upper member body 51, and the lower portion of the outward flange 53 integrally projecting downward from the bottom, and the extruded product. And a cylindrical portion 54 that is closely fitted to the inside of the upper end portion 44 and is coupled to the extruded product 44 by the coupling tool 45.

  The outward flange 52 is coupled to the crankcase 24 side by a fastener 55 via the speed reducer 35. A liquid sealing material is interposed between the upper end portion of the extruded product 44 and the cylindrical portion 54. The upper end surface of the extruded product 44 is in contact with the lower surface of the outward flange 53, and the upper end portion of the extruded product 44 is covered by the outward flange 53 from above.

  On the upper part of the lower member 48, there is a cylindrical portion 57 that protrudes upward and fits tightly inside the lower end of the extruded product 44 and is coupled to the extruded product 44 by the coupler 47. Is formed. Further, a liquid sealing material is interposed between the lower end portion of the extruded product 44 and the cylindrical portion 57. At the lower part of the lower member 48, front and rear flanges 58 are formed, and a cylindrical projection 59 protruding downward from the flange 58 side on the second axis 31 is integrally formed. Yes. The cylindrical protrusion 59 accommodates the upper part, which is at least part of the drive gear 37, and the lower end of the drive shaft 34 is supported by the cylindrical protrusion 59 together with the drive gear 37 by the lower bearing 33. ing.

  The lower case 43 is made of aluminum alloy and constitutes the lower end of the case 10. The lower case 43 accommodates the propeller shaft 16 and the driven gear 39 in the internal space 12 and supports the propeller shaft 16. In the lower case 43, a circular hole 61 that forms a part of the internal space 12 is formed on the second axis 31. The drive gear 37 is fitted in the circular hole 61 together with the cylindrical protrusion 59 so as to be detachable. In this case, the lower portion of the drive gear 37 is accommodated in the internal space 12 of the lower case 43. Further, the cylindrical protrusion 59 and the circular hole 61 are closely fitted, and a circle is formed between the outer peripheral surface of the cylindrical protrusion 59 and the inner peripheral surface of the circular hole 61 on the second axis 31. An annular seal body 62 is interposed.

  When the axial direction of the propeller shaft 16 is the front-rear direction, rear fasteners 63 and 64 are provided before the upper and lower cases 42 and 43 are coupled to each other. Specifically, the front and rear flanges 58 of the upper case 42 are coupled to the upper surface of the lower case 43 by the front and rear fasteners 63 and 64. In plan view, the front and rear fasteners 63 and 64 are disposed on the first axis 13, the front fastener 63 is disposed near the front of the circular hole 61, and the rear fastener 64 is disposed in the circular hole. It is arranged near the rear of 61.

  Rubber that is externally fitted to the lower end portion of the extruded product 44 of the upper case 42, the coupler 47, the lower member 48, the upper portion of the lower case 43, and the front and rear fasteners 63, 64 to protect them. A cover body 66 made of metal is provided.

  The propeller 18 is externally fitted to the propeller shaft 16 on the first axis 13, and is supported by being fastened to the propeller shaft 16 by the fastener 17, and the boss portion 68. Propeller blades 69 projecting radially outward are provided. The front and rear bearings 14 and 15 are disposed on the rear side of the tooth portion of the drive gear 37, and at least a part of the rear bearing 15 is fitted into the front end portion of the boss portion 68.

  A first stopper 70 that prevents the rear bearing 15 from moving forward relative to the lower case 43 is provided. The first stopper 70 is an annular protrusion integrally projecting on the inner peripheral surface of the internal space 12, and the front surface of the outer race of the rear bearing 15 abuts on the first stopper 70. 15 forward movement is prevented. A second stopper 71 is provided to prevent the propeller shaft 16 from moving forward relative to the rear bearing 15. The second stopper 71 is an annular protrusion integrally protruding on the outer peripheral surface of the axially intermediate portion of the propeller shaft 16, and the second stopper 71 contacts the rear surface of the inner race of the rear bearing 15. As a result, the forward movement of the second stopper 71 is prevented.

  The inner diameter of the seal body 19 is made larger than the outer diameter of the front end portion that is a part of the propeller shaft 16 that supports the driven gear 39.

  As shown in FIGS. 4, 7, and 8, the upper case 42, the drive shaft 34, and the drive gear 37 are combined into a combined body 73 that is integrally combined. On the other hand, the lower case 43, the propeller shaft 16, the propeller 18, and the driven gear 39 are another combined body 74 that is integrally combined. The upper case 42 in the combination 73 and the lower case 43 in the other combination 74 can be fixed to each other by the front and rear fasteners 63 and 64 (FIGS. 4 and 7) and can be detached (FIG. 8). It is said that.

  When the engine 11 of the outboard motor 5 is driven, the driving force of the engine 11 is decelerated by the reduction gear 35, and then the drive shaft 34, the drive gear 37, the driven gear 39, and the propeller shaft 16 are driven. To the propeller 18 and the ship 1 is propelled forward. In this case, the propeller shaft 16 attempts to move forward with respect to the lower case 43, but this forward movement is blocked by the rear bearing 15 and the first and second stoppers 70 and 71.

  According to the above configuration, the upper case 42, the drive shaft 34, and the drive gear 37 are combined into a combined body 73, and the upper case 42 and the lower case 43 in the combined body 73 can be attached to and detached from each other. Yes.

  For this reason, in the prior art, the lower end portion of the drive shaft and the drive gear supported by the lower end portion are accommodated in the recess formed in the upper inner surface of the internal space. For example, in the portion corresponding to the recess, the case 10 is divided into upper and lower cases 42 and 43, and the portion corresponding to the recess in the internal space 12 of the lower case 43 is outside the lower case 43. It is open to.

  Therefore, since there is no recess in the inner surface of the internal space 12, it is not necessary to provide a casting core corresponding to the recess in the mold in the casting operation of the lower case 43 of the case 10, Along with this, there is no need for installation work of the discarded core in the mold and removal work from the casting. As a result, the casting operation of the case 10 can be facilitated.

  Further, according to the above configuration, in the assembly work of the outboard motor 5, first, the upper case 42, the drive shaft 34, and the drive gear 37 are integrally combined to form the combined body 73 in a wide work space. Next, the upper case 42 and the lower case 43 in the combined body 73 may be coupled to each other.

  Therefore, in the assembling work of the outboard motor 5, the drive gear 37 is fitted into the recess formed in the inner surface of the internal space 12 through the narrow internal space 12 as in the prior art, and the drive gear The complicated operation of assembling 37 to the lower end of the drive shaft 34 is not necessary. As a result, assembly work of the outboard motor 5 can be facilitated.

  Further, as described above, the cylindrical protrusion 59 that protrudes downward and accommodates the drive gear 37 is formed in the lower portion of the upper case 42, and constitutes a part of the internal space 12 to The lower case 43 is formed with a circular hole 61 into which the drive gear 37 is fitted together with the cylindrical projection 59 and into which the cylindrical projection 59 is closely fitted.

  Therefore, in the assembly work of the outboard motor 5, the cylindrical protrusion 59 is tightly attached to the circular hole 61 before the upper case 42 and the lower case 43 in the combined body 73 are coupled to each other as described above. So that the relative positioning of the drive gear 37 and the driven gear 39 supported by the lower case 43 can be automatically and accurately performed, and the engagement of the drive gear 37 and the driven gear 39 can be accurately performed. Achieved. Therefore, in the assembling work of the outboard motor 5, the assembling work of the outboard motor 5 can be performed more easily because it is not necessary to pay attention to the meshing accuracy of the drive gear 37 and the driven gear 39.

  Further, as described above, the driving and driven gears 37 and 39 have the same shape and size.

  For this reason, the kind of the number of parts of the outboard motor 5 can be reduced, and management of these parts becomes easy. Therefore, the assembly work of the outboard motor 5 is further facilitated in this respect.

  Further, as described above, when the axial direction of the propeller shaft 16 is the front-rear direction, the rear fasteners 63 and 64 are provided before the upper and lower cases 42 and 43 are coupled to each other, and the front fastener 63 is formed into the circular shape described above. The rear fastener 64 is disposed in front of the hole 61 and the rear fastener 64 is disposed behind the circular hole 61.

  For this reason, it is prevented that the width dimension of the joint part of the upper and lower cases 42 and 43 in the case 10 is increased by the front and rear fasteners 63 and 64. Therefore, the width dimension of the case 10 can be reduced, and the resistance when the ship 1 is propelled can be reduced.

  In addition, although the above is based on the example of illustration, the said lower case 43 may be integrally integral as a whole.

It is a side view of an outboard motor. It is side surface upper cross-sectional view of an outboard motor. FIG. 4 is a side cross-sectional view of the outboard motor. It is side surface lower part sectional drawing of an outboard motor. It is a bottom view of the outward flange on the upper side of the upper case. FIG. 6 is a cross-sectional view of a joint portion between an extruded product and an upper member in an upper case. It is a lower top view of an outboard motor. It is an expanded view of a combination body and another combination body.

DESCRIPTION OF SYMBOLS 1 Ship 3 Hull 5 Outboard motor 10 Case 11 Engine 12 Internal space 13 1st shaft center 16 Propeller shaft 18 Propeller 31 2nd shaft center 34 Drive shaft 37 Drive gear 39 Driven gear 42 Upper case 43 Lower case 59 Cylindrical protrusion 61 Circular hole 62 Seal body 63 Front fastener 64 Rear fastener 73 Combination body 74 Other combination body

Claims (4)

A case that extends in a substantially vertical direction and can be supported on the hull side, and a propeller shaft that is accommodated in the internal space of the lower end of the case and supported by the case so as to be rotatable about a substantially horizontal first axis. And a drive shaft that is supported by the case so as to be rotatable about a substantially vertical second axis, and whose upper end is interlocked with the engine, and is housed in the internal space, and the lower end of the drive shaft And a driven gear housed in the internal space and coupled to the propeller shaft and meshing with the drive gear. The case is divided into an upper case and a lower case. in a mutually detachable to outboard,
On the, in mutual detachment condition of the lower case, on those among the lower case, the Rukoto the drive shaft only in the upper case is supported, these upper case, the drive shaft, and the drive gear combined integrally have been been combined body, the outboard motor, characterized in that the said upper case in the combination thereof, and the said lower case detachably coupled to each other.   A circular protrusion that protrudes downward, and that includes a cylindrical protrusion that accommodates the drive gear in the lower portion of the upper case, forms a part of the internal space, and fits the drive gear together with the cylindrical protrusion. The outboard motor according to claim 1, wherein a hole is formed in the lower case.   2. The outboard motor according to claim 1, wherein the driving and driven gears have the same shape and size. When the axial direction of the propeller shaft is the front-rear direction, a rear fastener is provided before the upper and lower cases are coupled to each other, the front fastener is disposed in front of the circular hole, and the rear fastener is the circular shape. The outboard motor according to claim 2 , wherein the outboard motor is disposed behind the hole.

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