JP2005319877A - Outboard motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an outboard motor allowing reduction in weight and miniaturization, while securing required strength of clamp brackets. <P>SOLUTION: The clamp brackets 5 and 6 are manufactured by a vacuum die-casting for supplying molten metal, while holding negative pressure within a metallic mold. Each of the clamp brackets 5 and 6 has a vertical side part 25 fixed to a transom plate 2a of a stern 2 and an upper side part 27 extending by bending forward from an upper end of the vertical side part 25 and vertically oscillatably supporting a swivel bracket 7 by the front part 27a. A bent part 26 from an upper part of the vertical side part 25 to an upper part 27 is made to have a film-beam-film structure provided with a band plate shaped outer peripheral film part 30 arranged along outer peripheries of the vertical side part 25 and the upper side part 27, a band plate shaped inner peripheral film part 31 arranged along inner peripheries and a planar beam part 32 for connecting the inner peripheral film part 31 and the outer peripheral film part 30. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an outboard motor supported by a clamp bracket disposed at the stern so as to be swingable up and down and steerable via a swivel bracket.

  Generally, in an outboard motor mounted on a small vessel, etc., a swivel bracket is supported by a clamp bracket fixed to the stern so that the swivel bracket can swing up and down around the swing axis, and the outboard motor main body around the steering shaft is supported by the swivel bracket. A structure that can be steered is adopted (for example, see Patent Documents 1 and 2).

In this type of outboard motor, a propulsion device collision load when a driftwood or the like collides during traveling and a forward thrust load due to propeller propulsion force are applied to the clamp bracket and swivel bracket. Therefore, it is necessary to make the rigidity and strength of the clamp bracket and swivel bracket corresponding to the input load. In this case, conventionally, it is common to set the portion where the largest load is applied to a thickness that provides the necessary rigidity and strength, and to design the basic shape of the entire bracket according to the thickness of the portion. .
JP 11-310194 A JP 2000-289691 A

  By the way, since the clamp bracket is generally manufactured by low pressure casting of an aluminum alloy, there is a restriction that the clamp bracket must be thick and relatively simple. For this reason, conventionally, in order to ensure the necessary rigidity and strength of the clamp bracket, there is a situation in which a basic shape based on the premise that the clamp bracket is excessively thick must be selected. This point causes an increase in weight and an increase in size.

  The present invention has been made in view of the above-described conventional situation, and an object thereof is to provide an outboard motor capable of realizing weight reduction and size reduction while ensuring necessary rigidity and strength of a clamp bracket.

  The invention according to claim 1 is an outboard motor comprising a clamp bracket fixed to the stern, a swivel bracket supported by the clamp bracket so as to be swingable up and down, and an outboard motor main body supported by the swivel bracket. The clamp bracket is manufactured by vacuum die casting that supplies a molten metal while holding the inside of the mold at a negative pressure, and a vertical side portion fixed to the transom plate of the stern, the vertical side And an upper side portion that extends forwardly from the upper end of the portion and supports the swivel bracket so that the swivel bracket can swing up and down. A plate-shaped outer peripheral film portion disposed along the outer periphery of the vertical side portion and the upper side portion, a plate-shaped inner peripheral film portion disposed along the inner periphery, and the inner peripheral film portion and the outer peripheral film portion. Board to connect with The film surface of the outer peripheral film part and the inner peripheral film part is substantially parallel to the swing axis of the swivel bracket. The beam surface is characterized by being substantially orthogonal to the swing axis of the swivel bracket.

  According to a second aspect of the present invention, in the first aspect, a plurality of ribs are integrally formed on the beam portion so as to connect the inner peripheral membrane portion and the outer peripheral membrane portion and to form a radial shape centering on the bent portion. It is characterized by being.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, a strip-like intermediate film portion is located between the outer peripheral film portion and the inner peripheral film portion and closer to the inner peripheral film portion side. It is characterized by being arranged so as to be substantially parallel to the movement axis.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the inner peripheral membrane portion is formed wider outside the outer peripheral membrane portion in the ship width direction.

  According to a fifth aspect of the present invention, in the fourth aspect, the clamp bracket is cast using a mold that opens and closes in a swing axis direction of the swivel bracket, and the mold parting line of the mold is The bent portion is characterized in that it is displaced outward in the ship width direction from other portions.

  According to a sixth aspect of the present invention, in any one of the first to fifth aspects, a tilt position restricting portion for restricting a tilt position of the swivel bracket is formed at a middle portion in the vertical direction of the clamp bracket, and a lower end of the clamp bracket. The lower pin support portion for supporting the lower pin to which the lower end portion of the cylinder mechanism that swings the swivel bracket up and down is coupled is formed on the portion so as to be displaced toward the ship width direction swivel bracket side. The beam portion connecting the peripheral membrane portion is characterized in that it is displaced from the ship width direction anti-swivel bracket side to the swivel bracket side between the tilt position restricting portion and the lower pin support portion.

  In the invention of claim 1, at least the bent portion of the clamp bracket includes a plate-like outer peripheral film portion disposed along the outer periphery, an inner peripheral film portion disposed along the inner periphery, and the inner peripheral film portion. It has a film-beam-film structure provided with a plate-like beam portion connecting the outer peripheral film portion. This membrane-beam-membrane structure can increase the cross-sectional secondary moment at the same weight by appropriately setting the thickness of the membrane part. As a result, the clamp bracket of the present invention can improve rigidity and strength while reducing the weight.

  Since the rigidity and strength can be improved as described above, the clamp bracket of the present invention can be manufactured by vacuum die casting. As a result, it is possible to increase the degree of freedom in design, for example, by adopting a basic shape in which the thickness of a portion requiring rigidity and strength is increased and the thickness of other portions is decreased. As a result, the clamp bracket can be further reduced in weight and size.

  Further, in the present invention, the inner and outer peripheral film portions having a large film area are arranged in the outer peripheral portion of the bent portion where the largest tensile stress or compressive stress is generated by the thruster impact load or forward thrust load. Yes. And these film parts have the surface high intensity | strength chill layer in which allowable stress is high by the chill effect by the said vacuum die-casting. Therefore, the large input load can be borne by the distributed stress of the entire surface. As a result, the clamp bracket of the present invention can realize further weight reduction and size reduction while ensuring necessary rigidity and strength.

  In the invention of claim 2, a plurality of ribs for connecting the inner peripheral film portion and the outer peripheral film portion are formed in the beam portion, and each rib is arranged so as to form a radial shape around the bent portion. Therefore, the bent portion can maintain the shape for securing the membrane-beam-membrane structure, and the strength and rigidity of the bent portion can be reliably increased.

  In the invention of claim 3, the intermediate film part is formed between the outer peripheral film part and the inner peripheral film part and closer to the inner peripheral film part side. The intermediate film part can reinforce the inner peripheral film part. As a result, it is not necessary to increase the thickness of the inner peripheral membrane portion, and therefore it is possible to bear a large input load without causing a intensive increase in weight in the inner peripheral membrane portion. That is, a substantially semicircular concave portion for avoiding interference with the corner portion of the transom plate is formed in the inner peripheral film portion of the bent portion, and the concave portion tends to cause a concentration of tensile stress. For this reason, conventionally, the required strength and rigidity have been ensured by making the concave portions thicker or larger. On the other hand, in the present invention, since the intermediate film portion is disposed in the vicinity of the inner peripheral film portion, the intermediate film portion also bears the input load, so that a large input is achieved without increasing the thickness and size. It is possible to bear the load and contribute to further weight reduction.

  In the invention of claim 4, the inner peripheral membrane portion is formed wider in the ship width direction than the outer peripheral membrane portion. Therefore, the area of the inner peripheral film portion where the largest tensile stress is generated is increased, and the rigidity and strength can be increased accordingly.

  In the invention of claim 5, the parting line of the mold at the bent portion is offset outward from the other portions. This means that the parting line has been shifted to a smaller stress, and the effect of stress concentration on the parting line can be mitigated. In other words, the stress distribution at the bent portion is generally larger at the inner side in the ship width direction and smaller at the outer side. In addition, burrs generally occur at the parting line portion. Depending on the degree of removal of the burrs, the stress tends to concentrate on the burrs. Therefore, when the parting line is set at the center in the width direction of the inner peripheral film part as usual, there is a concern that the degree of stress concentration is determined depending on the deburring after casting, and the quality becomes unstable. On the other hand, in the present invention, the parting line is displaced outward in the ship width direction. That is, since the parting line is deviated to the side where the stress is small, the degree is small even if the stress concentration occurs due to deburring. Therefore, the reliability with respect to quality is increased accordingly.

  In the invention of claim 6, the tilt position restricting portion is disposed in the middle portion of the clamp bracket, the lower pin support portion is disposed near the swivel bracket at the lower end portion, and the beam portion is swiveled between the tilt position restricting portion and the lower pin support portion. It is deviated to the bracket side. Therefore, the beam structure is advantageous to ensure rigidity and strength against thruster impact load or forward thrust load. That is, a large load is input to the lower pin support portion via the lower pin. And the beam part which consists of a single surface displaced by the side close | similar to the input position of this load, ie, the swivel bracket side, is couple | bonded with the said lower pin support part. As described above, the lower pin support portion is positioned in a state closer to the input position of the large load, that is, a position advantageous in terms of load load, in a state where the lower pin support portion is reinforced with the beam portion, and without excessive thickness. It becomes possible to bear the said big load.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 to 14 are views for explaining an outboard motor according to an embodiment of the present invention. FIG. 1 is a side view of the outboard motor mounted on the stern of the hull, and FIGS. 2 and 3 are brackets. FIG. 4, FIG. 5, FIG. 6 and FIG. 7 are a perspective view, a right side view, a left side view, and a front sectional view of the clamp bracket (a cross section taken along line VII-VII in FIG. 5, respectively). 8, 9, 10, 11, 12, and 13 are a perspective view, a right side view, a left side view of the swivel bracket (a cross-sectional view taken along line XX in FIG. 10), a front view, and a rear side, respectively. FIG. 14 is a cross-sectional plan view (cross-sectional view taken along line XIII-XIII in FIG. 9), and FIG. 14 is a cross-sectional view of a housing portion of the pump drive motor. Note that front and rear and left and right in this embodiment mean front and rear and left and right when viewed from the front of the hull.

  In the figure, reference numeral 1 denotes an outboard motor mounted on the stern 2 of a small vessel. The outboard motor main body 4 of the outboard motor 1 is supported on the stern by the bracket unit 3. The bracket unit 3 includes a pair of left and right clamp brackets 5 and 6 fixed to the transom plate 2a of the stern 2 and a tilt shaft 8 extending between the left and right clamp brackets 5 and 6, and a swing axis A And a swivel bracket 7 supported so as to be swingable up and down. The outboard motor main body 4 is supported by the swivel bracket 7 via the shaft portion of the steering 9 so as to be steerable around the steering axis B.

  The outboard motor main body 4 is connected to an upper case 12 having a drive shaft (not shown) on a lower case 11 on which a propulsion device 10 having a propeller 10a is disposed, and an exhaust guide (not shown) is connected to the upper case 12. The engine is mounted, and the outer periphery of the engine is surrounded by a cowling 14. The outboard motor 1 obtains propulsive force by transmitting the rotational force of the engine to the propeller 10a of the propulsion device 10 via a drive shaft.

  The exhaust guide is supported on the upper end portion of the shaft portion of the steering 9 with the upper mount member 16 interposed therebetween, and the upper case 12 is supported on the lower end portion with the lower mount member 17 interposed therebetween. A steering handle mounting portion 9 a extending forward is integrally formed at the upper end portion of the shaft portion of the steering 9.

  The bracket unit 3 is provided with a swing mechanism 19 described later. The swing mechanism 19 has a schematic structure in which an upper pin 20 supported by the swivel bracket 7 and a lower pin 21 supported by the left and right clamp brackets 5 and 6 are connected by a cylinder mechanism 22. The cylinder mechanism 22 includes, via the swivel bracket 7, the outboard motor body 4 in a traveling position where the propeller 10a is located underwater and a non-cruising position where the propeller 10a is located above the water surface (tilt up). Oscillate with the position).

  The left and right clamp brackets 5 and 6 are manufactured by supplying a molten aluminum alloy into the cavities while vacuuming the molds having cavities having shapes corresponding to the left and right clamp brackets 5 and 6 while maintaining the negative pressure. It is a vacuum die cast product. Since the left and right clamp brackets 5 and 6 have substantially the same shape, the right clamp bracket 6 will be mainly described.

  The clamp bracket 6 on the right side can vertically swing the swivel bracket 7 at a longitudinal side 25 fixed to the transom plate 2a and bent forward from the upper end of the longitudinal side 25 to its front part 27a. The bent portion 26 is a portion extending from the upper portion of the vertical side portion 25 to the rear portion of the upper side portion 27.

  A tilt boss portion 27b is formed in the front portion 27a of the upper side portion 27, the cylindrical tilt shaft 8 is inserted between the left and right tilt boss portions 27b, 27b, and both ends thereof are fastened and fixed by nuts 8a. ing.

  A portion of the clamp bracket 6 extending from the vertical side portion 25 to the bent portion 26 and further to the upper side portion 27 is arranged along the belt plate-like outer peripheral film portion 30 arranged along the outer periphery thereof and along the inner periphery. The film-beam-membrane structure includes a strip-shaped inner peripheral film portion 31 and a plate-shaped beam portion 32 connecting the inner peripheral film portion 31 and the outer peripheral film portion 30. The outer peripheral film portion 30, the inner peripheral film portion 31, and the beam portion 32 are set to have a thickness of about 1.5 to 5 mm.

  The film surfaces of the outer peripheral film portion 30 and the inner peripheral film portion 31 are parallel to the swing axis A of the swivel bracket 7, and the beam surface of the beam portion 32 extends in a direction perpendicular to the swing axis A. ing. In this way, the clamp bracket 6 is generally I-shaped when viewed in cross section.

  The upper part of the inner peripheral film part 31 of the vertical side part 25 is expanded in the ship width direction so as to reliably contact the transom plate 2a with a large area, and the lower part is narrower than the upper part. Further, since the outer peripheral film portion 30 of the vertical side portion 25 is inclined so as to be located rearward from the upper end portion to the height direction central portion, the beam portion 32 is arranged in the front and rear of the hull from the upper end to the height direction central portion. It is expanding in the direction. The central portion of the outer peripheral membrane portion 30 and the central portion of the inner peripheral membrane portion 31 are connected by a transverse membrane portion 33 that obliquely crosses the beam portion 32. Further, the lower part of the beam part 32 from the transverse film part 33 has the same width up to the lower end. A plurality of attachment holes 31a are formed in the upper part of the inner peripheral film part 31 of the vertical side part 25, and a long hole-like attachment hole 31b is formed in the lower part. The clamp bracket 6 is bolted and fixed to the transom plate 2a through the mounting holes 31a and 31b so that the clamp bracket 6 can be adjusted to a vertical position corresponding to the hull.

  A tilt position restricting portion 32e for restricting the tilt position of the outboard motor main body 4 is formed in the vicinity of the lower side of the transverse membrane portion 33 of the beam portion 32 of the vertical side portion 25. The restricting portion 32e has a plurality of pin holes 32a formed in the boss portion 32f formed so as to protrude inward in the ship width direction (the swivel bracket 7 side) of the beam portion 32. They are arranged along the trajectory and are formed so as to penetrate the tilt axis 8 in parallel. By mounting the tilt position restricting member 34 in any one of the pin holes 32a, the tilt position of the swivel bracket 7 and thus the outboard motor main body 4 is restricted.

  An arcuate recess 31c is formed in a portion corresponding to the corner of the transom plate 2a of the inner peripheral membrane portion 31 of the bent portion 26. A plurality of ribs 35 are integrally formed on the beam portion 32 extending from the bent portion 26 to the upper side portion 27 so as to form a radial shape centering on the concave portion 31c. The ribs 35 connect the concave portion 31 c and the outer peripheral film portion 30. In addition, arc-shaped film ribs 36 for connecting the ribs 35 are integrally formed on the beam part 32 of the bent part 26, and the film surface of the film ribs 36 is parallel to the swing axis A.

  A strip-like intermediate film portion 38 is formed between the outer peripheral film portion 30 and the inner peripheral film portion 31 of the bent portion 26. The intermediate film portion 38 is disposed closer to the inner peripheral film surface portion 31 than the outer peripheral film portion 30, and the film surface of the intermediate film portion 38 is parallel to the swing axis A. The intermediate film portion 38 is formed so as to be substantially concentric with the concave portion 31c, and is connected to the inner peripheral film portion 31 while connecting the ribs 35 to each other.

  The inner peripheral membrane portion 31 and the intermediate membrane portion 38 of the bent portion 26 are formed wider outside the outer peripheral membrane portion 30 in the ship width direction (see FIG. 7). A cast portion 37 having a depth reaching the position in the ship width direction of the beam 32 from the outer side in the ship width direction is formed between the inner peripheral film portion 31 and the intermediate film portion 38. Note that a cast portion is not formed on the inner side in the ship width direction between the inner peripheral portion 31 and the intermediate film portion 38.

  The clamp bracket 6 is formed by casting using a mold having a movable mold and a fixed mold that are opened and closed in the swing axis A direction of the swivel bracket 7. In this case, the mold parting line C is set to the beam surface on the inner side in the ship width direction of the beam portion 32 in the vertical side portion 25, and is offset to the outer side in the ship width direction from the inner beam surface in the bent portion 26. It is set at the position.

  A cylindrical lower pin support portion 39 that supports the lower pin 21 is formed at the lower end portion of the clamp bracket 6 so as to be displaced inward in the ship width direction (swivel bracket 7 side) from the tilt position restricting portion 32e. Yes. The lower pin support portion 39 is formed by penetrating a pin hole 39e in parallel with the tilt shaft 8 in a boss portion 39d arranged to be displaced toward the ship width direction swivel bracket side (inner side). The beam portion 32 is located on the outer side in the ship width direction of the boss portion 32f in which the pin hole 32a of the tilt position restricting portion 32e is formed. However, the pin beam portion 32b in which the lower pin support portion 39 is formed is displaced inward in the ship width direction via the inclined wall 32b ′. A plurality of ribs 39a are integrally formed on the outer side in the ship width direction of the pin beam portion 32b so as to form an upward radial shape with the lower pin support portion 39 as the center.

  The outboard motor 1 includes left and right clamp brackets 5 and 6 fixed to the stern 2 as described above, a swivel bracket 7 supported by the clamp brackets 5 and 6 so as to be swingable up and down, and the swivel bracket 7. Is provided with an outboard motor main body 4 supported so as to be steerable, and a swing mechanism 19 for swinging the outboard motor main body 4 between a sailing position and a non-cruising position.

  The swing mechanism 19 includes the cylinder mechanism 22 disposed between the swivel bracket 7 and the left and right clamp brackets 5 and 6, and a hydraulic mechanism 40 that supplies hydraulic oil to the cylinder mechanism 22. .

  The cylinder mechanism 22 slidably disposes a piston (not shown) in a cylinder 23 disposed so as to be located in the center of the swivel bracket 7 in the ship width direction, and a piston rod 24 is connected to the piston. The piston rod 24 is oil-tightly projected from the upper end of the cylinder 23. The piston rod 24 is connected to the upper pin 20, and the cylinder 23 is connected to the lower pin 21.

  The hydraulic mechanism 40 includes a hydraulic pump 41 that is connected to the cylinder 23 and supplies hydraulic pressure into the cylinder 23, and a pump drive motor 42 that drives the hydraulic pump 41. The drive motor 42 protrudes outward in the ship width direction through an opening 32c formed in the beam portion 32 of the left clamp bracket 5.

  The housing portion 32d for housing the drive motor 42 is integrally formed with the beam portion 32 so as to bulge outward in the ship width direction following the opening portion 32c of the left clamp bracket 5 (see FIG. 4). .

  The housing portion 32d is integrally formed when the clamp bracket is manufactured by the vacuum die casting described above, and the thickness of the housing portion 32d is set to be thinner than the thickness of the beam portion 32. Yes. Specifically, the thickness of the accommodating portion 32d is about 1.0 to 1.5 mm.

  The housing portion 32d has an oval shape in which a long axis is disposed in an arc direction centering on the swing axis A of the swivel bracket 7 when viewed in a cross section across the motor shaft.

  In the present embodiment, since the housing portion 32d is integrally formed with the clamp bracket 5 by vacuum die casting, the housing portion 32d can be formed with the minimum necessary thickness, and the strength against external force can be ensured. Thereby, the increase in the weight of the clamp bracket 5 due to the formation of the accommodating portion 32d can be suppressed as much as possible.

  Further, since the housing portion 32d is integrally formed so as to be continuous with the opening portion 32c formed in the beam portion 32 of the clamp bracket 5, the housing portion 32d functions as a reinforcing member for the opening portion 32c. 5 can be prevented from lowering in strength. Further, the strength of the housing portion 32d itself can be increased, and for example, deformation when an occupant gets on the housing portion 32d can be prevented.

  That is, when the drive motor is structured to protrude outward in the ship width direction from the motor insertion hole formed in the clamp bracket, the motor insertion hole is closed with a metal or resin cover (for example, (Refer to FIG. 12 of JP 2000-289691 A). However, when the metal cover is attached, there is a problem that the weight of the entire cover including the attachment parts increases, and when the resin cover is attached, the strength against the external force tends to be insufficient.

  Since the housing portion 32d is formed in an oval shape having a long axis in the arc direction centering on the swing axis A, the drive motor 42 can be prevented from interfering with the housing portion 32d during tilt-up, and the drive motor can be maintained during maintenance. 42 can be easily removed.

  Further, since the housing portion 32d is integrally formed with the clamp bracket 5 by vacuum die casting, the thickness of the housing portion 32d can be suppressed to a necessary minimum, and the increase in weight can be suppressed as described above.

  The swivel bracket 7 is manufactured by supplying a molten aluminum alloy into the cavity while sucking the inside of a mold having a cavity having a shape corresponding to the swivel bracket 7 and holding it at a negative pressure. It is a die cast product.

  The swivel bracket 7 includes a cylindrical steering tube portion 50 that supports the outboard motor main body 4 so as to be steerable, a vertical side portion 51 that is disposed along both sides of the steering tube portion 50 in the ship width direction, The front side 53a has a top side 53a which is bent and extended forward from the upper end of the vertical side 51, and is supported by the left and right clamp brackets 5 and 6 so as to be swingable. A bent portion 52 is formed from the upper part to the rear part of the upper side portion 53.

  The shaft portion of the steering 9 is inserted into the steering cylinder portion 50 and is rotatably supported via a bearing (not shown). Further, a stopper boss portion 52a for restricting the opening degree of the steering wheel 9 when the steering wheel 9 comes into contact with the bent portion 52 projects.

  The upper side portion 53 has left and right side portions 53b and 53b extending forward from the bent portion 52, and a cylindrical tilt shaft support boss portion 53c is formed on the front portions 53a and 53a of the left and right side portions 53b. Is formed so as to integrally couple the side portions 53b. The tilt shaft 8 is inserted into the tilt shaft support boss portion 53c.

  The portion of the swivel bracket 7 extending from the vertical side 51 to the bent portion 52 and the upper side 53 includes a plate-like outer peripheral film portion 55 arranged along the outer periphery thereof, and a plate-like shape arranged along the inner periphery. The inner peripheral membrane portion 56 and the plate-like beam portion 57 that connects the inner peripheral membrane portion 56 and the outer peripheral membrane portion 55 have a membrane-beam-membrane structure. In addition, the thickness of the inner peripheral membrane portions 55 and 56 and the beam portion 57 is about 1.5 to 5 mm, and the thickness of the inner peripheral membrane portion 56 is equal to or greater than the thickness of the outer peripheral membrane portion 55. It has become. Further, the dimensions in the ship width direction of the outer peripheral film part 55 and the inner peripheral film part 56 are set to substantially the same value.

  The film surfaces of the outer peripheral film part 55 and the inner peripheral film part 56 are parallel to the swing axis A of the swivel bracket 7, and the beam surface of the beam part 57 extends in a direction perpendicular to the swing axis A. Yes.

  A connecting rib 58 that connects the outer peripheral film portion 55 and the inner peripheral film portion 56 is integrally formed on the beam portion 57 so as to be substantially radially centered around the bent portion 52. Further, intermediate ribs 59 connecting the connecting ribs 58 are integrally formed between the outer peripheral film part 55 and the inner peripheral film part 56 of the beam part 57 so as to extend from the bent part 52 to the upper side part 53.

  The vertical side 51 portion of the outer peripheral membrane portion 55 is disposed along both sides of the steering cylinder portion 50 in the ship width direction, and crosses the steering axis B of the steering cylinder portion 50 when viewed from the side. It is inclined so that the lower part is located rearward. Further, the bent portion 52 of the outer peripheral membrane portion 55 is formed at the upper edge of the steering tube portion 50 across the entire width in the ship width direction from the left side portion 53b to the right side portion 53b in the ship width direction. The upper side portion 53 is formed along the left and right side portions 53b and 53b. A portion between the left and right side portions 53b in the upper side portion 53 is a recess.

  The vertical side 51 portion of the inner peripheral membrane portion 53 connects the side membrane portions 60 and 60 disposed on both sides of the steering tube portion 50 in the ship width direction and the lower end portions of the both side membrane portions 60, and the steering. And a central membrane portion 61 disposed so as to cover the cylindrical portion 50 from the front side. A space is formed between the left and right side film portions 60 and 60. A portion of the inner peripheral membrane portion 53 extending from the bent portion 52 to the upper side portion 53 extends over the entire width in the ship width direction of the left and right side portions 53b and 53b and continues to the tilt shaft support boss portion 53c. It is formed to do.

  Upper pin support boss portions 60a are formed on the left and right side film portions 60, and the upper pins 20 are bridged and supported on the left and right support boss portions 60a. The connecting rib 58 and the intermediate rib 59 are connected to the upper pin support boss 60a.

  An outer reinforcing rib 63 that connects the vertical side portion 51 and the steering cylinder portion 50 is integrally formed at the lower end of the outer peripheral membrane portion 55 so as to be continuous with the outer peripheral membrane portion 55. An inner reinforcing rib 64 that connects the vertical side portion 51 and the steering cylinder portion 50 is integrally formed at the lower end of the inner peripheral membrane portion 56 so as to be continuous with the inner peripheral membrane portion 56. The outer and inner reinforcing ribs 63 and 64 are formed so as to narrow toward the lower side from the outer edges of the outer and inner peripheral membrane portions 55 and 56.

  The left and right side membrane portions 60, 60 of the inner peripheral membrane portion 56 are stopper portions 65, which regulate the tilt position by contacting the tilt position regulating members 34, 34 mounted on the left and right clamp brackets 5, 6. 65 is integrally projected. The stopper portion 65 is disposed so as to be positioned at a corner portion where the outer edge of the side membrane portion 60 and the inner reinforcing rib 64 are continuous. The side film part 60 and the central film part 61 form a continuous surface through the side part a of the stopper part 65. Further, the ship width direction dimension w1 of the distal end portion of the stopper portion 65 is set to approximately ½ of the ship width dimension w of the side membrane portion 60, and spreads toward the side membrane portion 60 from the distal end portion. ing.

  Next, the effect of this embodiment is demonstrated.

  In the present embodiment, the portions extending from the vertical side portion 25 of the left and right clamp brackets 5 and 6 to the bent portion 26 and the upper side portion 27 are formed on the inner peripheral surface of the belt-like outer peripheral film portion 30 disposed along the outer periphery. A film-beam-film structure including an inner peripheral film portion 31 disposed along the plate and a plate-shaped beam portion 32 connecting the inner peripheral film portion 31 and the outer peripheral film portion 30 is formed. Therefore, the clamp brackets 5 and 6 can increase the sectional moment at the same weight by appropriately setting the film thickness of the film portion, and can improve the rigidity and strength while reducing the weight.

  Moreover, since the rigidity and strength can be improved by the membrane-beam-membrane structure as described above, the clamp brackets 5 and 6 can be manufactured by vacuum die casting. For this reason, it is possible to increase the degree of freedom in design, for example, by adopting a basic shape in which the thickness of a portion requiring strength is increased and the thickness of other portions is decreased. As a result, the weight and size of the clamp brackets 5 and 6 can be more reliably realized.

  Further, the propulsion unit collision load F1 or the forward thrust load F2 can be borne by the distributed stress of the entire surface, and as a result, the weight reduction and size reduction can be achieved while ensuring the required strength of the clamp brackets 5 and 6.

  That is, to the left and right clamp brackets 5 and 6, a propulsion device collision load F1 when colliding with driftwood or the like during traveling is applied via the swivel bracket 7, and a forward thrust load F2 due to the propulsion force of the propeller 10a is swiveled. Join through the bracket 7. In this case, although the magnitude of the impact force is greater in the propulsion unit collision load F1 than the forward thrust load F2, the propulsion unit collision load F1 is a collision buffer function disposed between the swivel bracket 7 and the clamp brackets 5 and 6. The impact force is attenuated by the cylinder mechanism 22 having Accordingly, the load acting on the left and right clamp brackets 5 and 6 is substantially larger in the forward thrust load F2. This forward thrust load F2 acts on the left and right clamp brackets 5 and 6 so as to push the tilt boss portion 27b at the front end upward from the swivel bracket 7 via the tilt shaft 8, and as a result, a large pull is applied to the inner peripheral portion of the bent portion 26. A large compressive stress f2 acts on the outer periphery of the stress f1.

  In the present embodiment, a membrane-beam-membrane structure is adopted in which the inner peripheral film portion 31 and the outer peripheral film portion 30 are arranged at intervals in the outer peripheral portion of the bent portion 26 and both are joined by the beam portion 32. As a result, the sectional moment of inertia of the clamp bracket at the same weight is increased. Moreover, each said film part has a surface high intensity | strength chill layer with a large allowable stress by the chill effect by vacuum die-casting. As a result, the tensile stress f1 and the compressive stress f2 can be borne as distributed stress over the entire film surface, and the clamp bracket of this embodiment can efficiently withstand a large load.

  In the present embodiment, a plurality of ribs 35 are formed on the beam portion 32 to connect the inner peripheral membrane portion 31 and the outer peripheral membrane portion 30, and each rib 35 is arranged so as to form a radial shape around the bent portion 26. Yes. Therefore, the respective rackets can reliably maintain the shape for holding the membrane-beam-membrane structure, and as a result, the strength and rigidity of the bent portion 26 can be further increased.

  In the present embodiment, the intermediate film part 38 is formed between the outer peripheral film part 30 and the inner peripheral film part 31 of the bent part 26 and closer to the inner peripheral film part 31 side. The intermediate film portion 38 bears a part of the tensile stress f1 and can reinforce the inner peripheral film portion 31. Therefore, it is not necessary to concentrate the weight arrangement on the bent portion 26. That is, the clamp bracket of the present embodiment is thick and can bear a large input load without increasing its size. That is, the inner peripheral film portion 31 of the bent portion 26 must be provided with a relief portion for avoiding interference with the corner portion of the transom plate 2a. In the present embodiment, a semicircular concave portion 31c is formed. ing. In the recess 31c, a tensile stress exceeding the aluminum proof stress is easily generated. For this reason, conventionally, the concave portion is made thick and large to ensure the required strength. On the other hand, in the present embodiment, the intermediate film portion 38 is disposed in the vicinity of the inner peripheral film portion 31. As a result, it is possible to bear a large input load without intensively increasing the thickness and further reducing the weight.

  In the present embodiment, since the inner peripheral membrane portion 31 is formed wider in the ship width direction than the outer peripheral membrane portion 30, the strength of the inner peripheral membrane portion 31 to which the largest tensile force is applied is further increased.

  In the present embodiment, the mold parting line C at the bent part 26 is offset from the parting line C of the vertical side part 25 outward in the ship width direction. That is, the parting line C is shifted to the smaller stress distribution. Therefore, the stress concentration in the bent portion 26 can be relaxed.

  In other words, the stress distribution on the inner peripheral surface of the bent portion 26 is generally larger at the inner side in the ship width direction and smaller at the outer side as schematically shown in FIG. A cast burr is generally formed in the parting line C. This burr causes stress concentration if it is not reliably removed. In this embodiment, the parting line C in which this stress tends to concentrate is displaced to the outside where the distributed stress is small. For this reason, even if there is a stress concentration, the degree is small. As a result, it is possible to alleviate the problem of excessive stress concentration caused by deburring after casting. Therefore, the reliability for quality can be increased accordingly.

  In the present embodiment, the lower pin support portion 39 to which the cylinder mechanisms 22 of the left and right clamp brackets 5 and 6 are connected is offset on the swivel bracket side (inner side), and the outer peripheral membrane portion 30 and the inner peripheral membrane portion. The pin beam portion 32 b of the beam 32 connecting the beam 31 is offset to the same side as the lower pin support portion 39. Therefore, it is advantageous in securing rigidity and strength against the propulsion unit collision load F1 or the forward thrust load F2. That is, a large load is input to the lower pin support portion 39 via the lower pin 21. A pin beam portion 32b having a single surface is coupled to the lower pin support portion on the side close to the input position of the large load, that is, on the swivel bracket side. In this way, the lower pin support portion is positioned on the side close to the input position of the large load, that is, at a position advantageous in terms of load bearing, with the pin beam portion 32b reinforced, and can withstand the large load. it can.

  In the present embodiment, the portion of the swivel bracket 7 that extends from the vertical side portion 51 of the swivel bracket 7 to the bent portion 52 and the upper side portion 53 includes a plate-like outer peripheral film portion 55 disposed along the outer periphery, and an inner periphery. A film-beam-film structure including an inner peripheral film portion 56 disposed along the plate and a plate-like beam portion 57 connecting the inner peripheral film portion 56 and the outer peripheral film portion 55 is formed. This structure can increase the secondary moment of inertia at the same weight, and can improve rigidity and strength while reducing weight.

  Further, since the rigidity and strength can be improved as described above, the swivel bracket 7 can be manufactured by vacuum die casting. For this reason, it is possible to increase the degree of freedom in design, for example, by adopting a basic shape in which the thickness of a portion requiring rigidity and strength is increased and the thickness of other portions is decreased. As a result, the weight and size of the swivel bracket 7 can be realized more easily and reliably.

  Further, an inner peripheral film portion having a high strength chill layer on the inner peripheral surface of the bent portion 52 where the largest tensile stress is generated by the propulsion unit collision load F1 and whose allowable stress is increased by the chill effect by the vacuum die casting. 56 can be arranged, and the input load can be borne by the distributed stress of the entire film surface. As a result, it is possible to reduce the weight and size while ensuring the necessary strength of the swivel bracket 7.

  Since the propulsion unit collision load F1 is directly applied to the swivel bracket 7, the propulsion unit collision load F1 is larger than the forward thrust load F2, contrary to the clamp brackets 5 and 6. Due to this propulsion unit collision load F1, a large tensile stress f1 is generated on the inner peripheral surface of the swivel bracket 7, and a large compressive stress f2 is generated on the outer peripheral surface.

  In the present embodiment, the outer peripheral membrane portion 55 is disposed on both sides of the steering tube portion 50 in the ship width direction, and the left and right side membrane portions 60, 60 are disposed on both sides of the steering tube portion 50, and Since the two side membrane portions 60 are connected to each other and the central membrane portion 61 is arranged so as to cover the steering cylinder portion 50, it is not necessary to perform a concentrated weight arrangement. That is, the strength and rigidity of the bent portion 52 with respect to the tensile force and compressive force can be increased without increasing the thickness and size of the bent portion, which can contribute to further weight reduction.

  In the present embodiment, the outer reinforcing rib 63 that connects the vertical side portion 51 and the steering cylinder portion 50 is formed to be continuous with the outer peripheral membrane portion 55, and the inner reinforcing rib 64 is continuous with the inner peripheral membrane portion 56. It is formed as follows. Therefore, the strength against the bending moment applied to the steering cylinder portion 50 by the propulsion unit collision load F1 and the forward thrust load F2 can be increased. That is, when the planar reinforcing ribs 63 and 64 are arranged at the front and rear positions at a distance from the center of the cross-sectional secondary moment, a high reinforcing effect of the cross-sectional secondary moment can be obtained. In the present embodiment, the reinforcing ribs 63 and 64 are integrally formed so as to be continuous with the inner peripheral membrane portions 55 and 56 outside the space where the reinforcing ribs 63 and 64 are spaced apart from each other. Good thinning has been realized.

  In the present embodiment, the stopper portion 65 that regulates the tilt position is formed on the left and right side film portions 60, and the side film portion 60 and the central film portion 61 are continuous surfaces passing through the side portion a of the stopper portion 65. Therefore, the load applied to the stopper portion 65 can be dispersed from the side film portion 60 onto the surface of the central film portion 61, and stress can be prevented from concentrating on the stopper portion 64.

  That is, when the propulsion unit collision load F1 is input, the impact load from the collision part (propulsion unit or lower case part) propagates from the vicinity of the lower end of the steering shaft of the swivel bracket 7 to the shock absorbing mechanism of the swing mechanism. In this case, when the side portion a and the inclined surface w2 as shown in FIG. 11 do not exist in the stopper portion 65, stress concentrates on the stopper portion, and it is necessary to reinforce it with a thick wall. In the present embodiment, the impact load can be smoothly propagated from the lower part to the upper part through the side part a, and the periphery of the stopper part 65 is the inclined surface w2, so from these points Stress concentration can be relaxed.

  In the present embodiment, since the left and right side portions 53b, 53b of the upper side portion 53 are integrally joined by the cylindrical tilt shaft support boss portion 53c, the rigidity against external force can be increased without increasing the thickness. That is, the conventional tilt shaft boss is generally provided with left and right bearings from the viewpoint of weight reduction, and is generally stealed between the two to form a cavity. On the other hand, since the tilt shaft boss part has a structure in which the steering guide slides on the inner diameter part, it is necessary to suppress the elastic deformation itself within a specified value as well as damage to the load. For this reason, conventionally, the bearing portion has been made thicker, which resulted in an increase in weight.

  Further, in the present embodiment, the connecting rib 58 and the intermediate rib 59 that are regarded as integral surfaces are continuously disposed between the outer peripheral film portion 55 and the inner peripheral film portion 56 of the swivel bracket 7, so that the connection as an integral surface is achieved. It is possible to avoid stress concentration and to further reduce the weight by making the shape simple. Moreover, the hot water flow around each rib at the time of casting can be improved, and the quality can be improved.

  Since the thickness of the inner peripheral membrane portion 56 is equal to or greater than the thickness of the outer peripheral membrane portion 55, the strength of the inner peripheral surface of the bent portion 52 that receives the largest tensile force due to the thruster collision load F1 is excessively thick. Can be secured without.

1 is a side view of an outboard motor mounted on a stern of a hull according to an embodiment of the present invention. It is a partial cross section front view of the bracket unit arrange | positioned at the said stern. It is a perspective view of the said bracket unit. It is a perspective view of the left and right clamp brackets of the bracket unit. It is a right side view of the clamp bracket. It is a left side view of the clamp bracket. FIG. 7 is a sectional front view of the clamp bracket (sectional view taken along line VII-VII in FIG. 5). It is a perspective view of the swivel bracket of the bracket unit. It is a right view of the said swivel bracket. FIG. 11 is a cross-sectional left side view of the swivel bracket (cross-sectional view taken along line XX in FIG. 10). It is a front view of the said swivel bracket. It is a rear view of the said swivel bracket. FIG. 10 is a cross-sectional plan view of the swivel bracket (cross-sectional view taken along line XIII-XIII in FIG. 9). It is sectional drawing of the accommodating part of the pump drive motor of the said clamp bracket.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outboard motor 2 Stern 2a Transom board 4 Outboard motor main body 5,6 Clamp bracket 7 Swivel bracket 19 Oscillating mechanism 22 Cylinder mechanism 25 Vertical side portion 26 Bending portion 27 Upper side portion 27a Front portion 30 Outer peripheral membrane portion 31 Inner peripheral membrane Part 32 Beam part 32d Storage part 35 Rib 38 Intermediate film part 39 Lower pin support part 40 Hydraulic mechanism 42 Hydraulic pump drive motor A Oscillating axis C type dividing line

Claims (6)

  An outboard motor comprising a clamp bracket fixed to the stern, a swivel bracket supported by the clamp bracket so as to be swingable up and down, and an outboard motor main body supported by the swivel bracket. It is manufactured by vacuum die-casting that supplies molten metal while keeping the inside of the mold at a negative pressure, and is bent forward from the upper end of the vertical side and fixed to the transom plate of the stern And at the front part thereof, an upper side part that supports the swivel bracket so as to be able to swing up and down, and at least a bent part extending from the upper part of the vertical side part to the rear part of the upper side part, A plate-like outer peripheral membrane portion arranged along the outer periphery of the plate portion, a plate-like inner peripheral membrane portion arranged along the inner circumference, and a plate-like shape connecting the inner peripheral membrane portion and the outer peripheral membrane portion With beam -A beam-membrane structure, in which the film surface of the outer peripheral film portion and the inner peripheral film portion is substantially parallel to the swing axis of the swivel bracket, and the beam surface of the beam portion is the swing of the swivel bracket. An outboard motor characterized by being substantially orthogonal to a moving axis.   In Claim 1, A plurality of ribs are integrally formed in the beam part so as to connect the inner peripheral film part and the outer peripheral film part and to form a radial shape centering on the bent part. Outboard motor.   3. The plate-like intermediate film part between the outer peripheral film part and the inner peripheral film part and closer to the inner peripheral film part side so that the film surface thereof is substantially parallel to the oscillation axis. An outboard motor characterized by being arranged toward the vehicle.   The outboard motor according to any one of claims 1 to 3, wherein the inner peripheral membrane portion is formed wider outward in the ship width direction than the outer peripheral membrane portion.   5. The clamp bracket according to claim 4, wherein the clamp bracket is cast using a mold that opens and closes in the swing axis direction of the swivel bracket, and the bent portion of the mold parting line of the mold is the other part. An outboard motor characterized by being offset more outward in the width direction.   6. The tilt position restricting portion for restricting the tilt position of the swivel bracket is formed at a middle portion in the vertical direction of the clamp bracket, and the swivel bracket is provided at a lower end portion of the clamp bracket. A lower pin support portion that supports a lower pin to which a lower end portion of a cylinder mechanism that swings up and down is connected is formed to be displaced toward the ship width direction swivel bracket side, and connects the outer peripheral membrane portion and the inner peripheral membrane portion. An outboard motor characterized in that the beam portion is offset from the side opposite the swivel bracket side to the swivel bracket side between the tilt position restricting part and the lower pin support part.

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