JP2007246037A - Outboard motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an outboard motor having a compact structure capable of reliably supporting a drive side bevel gear and a driven side bevel gear. <P>SOLUTION: In the outboard motor which transmits an output of an engine 60 to a drive shaft 53a of an upper casing 157, and transmits a rotational force transmitted to the drive shaft 53a to a propeller shaft 53c of a lower casing 158, an integrally rotating drive side bevel gear 110 is provided on an intermediate portion of the drive shaft 53a, the lower end of the drive shaft 53a is supported by the lower casing 158 via a bearing 200 so as to be turnable, an integrally rotating driven side bevel gear 130 is provided on one end of the propeller shaft 53a, the driven side bevel gear 130 is fastened and fixed by a fastening member fastened to the end of the propeller shaft 53a, and the fastening member is located between the drive shaft 53a and the driven side bevel gear 130 to make the drive side bevel gear 110 located on an upper side engaged with the driven side bevel gear 130 located on a lower side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an outboard motor, and more particularly, to an outboard motor that transmits an engine output to a drive shaft and transmits a rotational force transmitted to the drive shaft to a propeller shaft to obtain a propulsion force.

Among such outboard motors, there is an outboard motor that transmits the output of the engine to the drive shaft of the upper casing and transmits the rotational force transmitted to the drive shaft to the propeller shaft of the lower casing (Patent Document 1). In this device, a tip end portion of a drive shaft is rotatably supported by a lower casing via a bearing, and a driven side bevel gear of the propeller shaft is meshed with a driving side bevel gear provided on the drive shaft from above. Further, in a small outboard motor, the drive shaft and drive side bevel gear support structure is such that the drive shaft is supported by two bearings in the lower casing, and the drive side bevel gear overhangs outside the drive shaft at the tip. This drive-side bevel gear meshes with the lower driven-side bevel gear.
JP 2000-105859 A

  In this way, in the structure in which the driving side bevel gear and the driven side bevel gear are meshed and the power of the drive shaft is transmitted to the propeller shaft, a meshing force is generated during driving, so that the tooth surface of the driving side bevel gear and the driven side bevel gear is It will shift relatively. Further, the gear endurance performance is likely to be deteriorated due to the contact failure of the driving side bevel gear and the driven side bevel gear.

  On the other hand, the structure that supports the driven bevel gear on the propeller shaft performs positioning in the axial thrust direction using a circlip, so that there is a defect that the outboard motor may easily shift due to the axial impact force, for example, when it is thrust into shallow water. .

  The present invention has been made in view of this point, and an object of the present invention is to provide an outboard motor capable of reliably supporting the driving side bevel gear and the driven side bevel gear with a compact structure.

  In order to solve the above problems and achieve the object, the present invention is configured as follows.

The invention described in claim 1
In an outboard motor that transmits the engine output to the drive shaft of the upper casing and transmits the rotational force transmitted to the drive shaft to the propeller shaft of the lower casing.
A drive-side bevel gear that rotates integrally with an intermediate portion of the drive shaft;
The lower end of the drive shaft is supported rotatably on the lower casing via a bearing,
At one end of the propeller shaft, it has a driven bevel gear that rotates integrally,
The driven bevel gear is fastened and fixed by a fastening member fastened to one end of the propeller shaft,
The fastening member is located between the drive shaft and the driven bevel gear;
An outboard motor characterized in that the driving bevel gear positioned above and the driven bevel gear positioned below are meshed.

The invention described in claim 2
A step is provided on the outer periphery of the lower end of the drive shaft,
The bearing is a rolling bearing,
The outboard motor according to claim 1, wherein the stepped portion is in contact with an inner ring of the rolling bearing.

The invention described in claim 3
A fixing member that supports the drive-side bevel gear is disposed on the drive shaft;
3. The outboard motor according to claim 1, wherein an elastic member for adding a load is disposed between the driving side bevel gear and the fixing member. 4.

  With the above configuration, the present invention has the following effects.

  According to the first aspect of the present invention, the drive shaft provided with the drive side bevel gear has its lower end portion connected to the lower casing via the bearing even when the engagement force is generated by the engagement of the drive side bevel gear and the driven side bevel gear. On the other hand, since the driven bevel gear is fastened and fixed by the fastening member, the displacement of the tooth surface position between the driving bevel gear and the driven bevel gear can be suppressed, and durability and impact strength are improved. . In addition, the outboard motor may rush into the shallows, but the bevel gear on the driven side is securely supported by the propeller shaft even in the axial impact force applied from the propeller to the propeller shaft at this time, and there is no axial displacement. The durability is improved, and the fastening member is positioned between the drive shaft and the driven bevel gear, thereby providing a compact support structure.

  According to the second aspect of the present invention, a step portion is provided on the outer periphery of the lower end portion of the drive shaft, and the step portion is brought into contact with the inner ring of the rolling bearing to support the drive shaft, whereby the drive side bevel gear and the driven side bevel gear are engaged. It is possible to prevent tooth contact due to the weight of the drive shaft at the time, and it is possible to prevent abnormal noise and improve durability by improving to the normal tooth contact.

  According to the third aspect of the present invention, the fixing member that supports the driving side bevel gear is disposed on the drive shaft, and an elastic member that adds a load is disposed between the driving side bevel gear and the fixing member. The downward movement due to the weight of the bevel gear itself can be restricted by the reaction force of the elastic member, and the tooth contact is stabilized and the durability is improved.

  Hereinafter, embodiments of the outboard motor of the present invention will be described. However, the embodiments of the present invention show the most preferable modes of the present invention, and the present invention is not limited thereto.

  FIG. 1 is a side view of an outboard motor mounted on a ship, FIG. 2 is a plan view of the engine of the outboard motor, and FIG. 3 is a side view of the engine of the outboard motor as viewed from the rear in the traveling direction. In this embodiment, the forward direction, the rear side, the right side, and the left side are defined with respect to the traveling direction in which the ship advances, and the vertical direction is defined as the vertical direction.

  First, in FIG. 1, the ship has a transom board 2 at the rear of the hull 1. A clamp bracket 10 is fixed to the transom board 2 by a clamp screw mechanism 20. A swivel bracket 30 is rotatably connected to the clamp bracket 10 via a tilt shaft 4. A support cylinder 51 of the propulsion unit 50 is supported on the swivel bracket 30 via upper and lower swivel bracket covers 33 so as to be rotatable.

  An upper casing 157 is attached to the lower part of the support cylinder 51, and a lower casing 158 is attached to the lower end of the upper casing 157. A drive shaft 53 a is disposed in the upper casing 157. The lower casing 158 is provided with a power transmission gear unit 53b and a propeller shaft 53c, and a propeller 52 is provided on the propeller shaft 53c.

  On the other hand, a four-cycle engine 60 is provided above the support cylinder 51 via a planetary gear unit 70. The engine 60 is air-cooled, and the power of the engine 60 is decelerated by a speed reduction mechanism 70 a built in the planetary gear unit 70, thereby constituting a power transmission mechanism 53 built in the upper casing 157 and the lower casing 158 from the support cylinder 51. Is transmitted to the propeller 52 via the drive shaft 53a, the power transmission gear unit 53b, and the propeller shaft 53c, and a propulsive force is obtained by the rotation of the propeller 52.

  The engine 60 has an engine main body 61, and the engine main body 61 is arranged with the cylinder 62 facing rearward. An intake pipe 63 is connected to the upper part of the cylinder 62, and an air cleaner 64 is connected to the intake pipe 63. A carburetor 65 is disposed in the intake pipe 63, and the carburetor 65 is operated by a throttle operation mechanism 80. An exhaust pipe 265 is connected to the lower part of the cylinder 62, and a muffler 266 is connected to the exhaust pipe 265 so that the exhaust gas is exhausted in the air.

  The throttle operation mechanism 80 includes a throttle lever 81, a first throttle rod 82, a second throttle rod 83, a support link 84, an operation link 85, and an operation shaft 86. The throttle lever 81 is rotatably supported by a mounting plate 87 with a rotating shaft 88 as a fulcrum. One end of the first throttle rod 82 is locked to the throttle lever 81, and the other end of the first throttle rod 82 is connected to the support link 84. It is locked. One end of the second throttle rod 83 is locked to the support link 84, the other end of the second throttle rod 83 is locked to the operation link 85, and the operation link 85 is fixed to the operation shaft 86. By pulling the throttle lever 81 forward, the operation shaft 86 is rotated in the opening direction via the first throttle rod 82, the support link 84, the second throttle rod 83, and the operation link 85, while the throttle lever 81 is returned. The operating shaft 86 can be returned to the initial closed position.

  The mounting plate 87 is fastened and fixed to the right side of the engine main body 61 by a bolt 188, and has a stopper 89 that restricts the rotation of the throttle lever 81, and the operation position in the pulling direction when the claw portion 81a of the throttle lever 81 abuts. Regulate. The support link 84 is rotatably supported by a support portion 63a formed integrally with the intake pipe 63.

  A fuel tank 90 is disposed on the upper portion of the engine body 61. The rear side of the fuel tank 90 is supported on both sides of the engine body 61 by a pair of left and right stays 91, and the front side is supported by a flywheel magneto cover 93 of the engine body 61 by one front side stay 92. A predetermined space 190 is formed between 90 and the flywheel magneto cover 93. A starter handle 101 for starting the recoil starter 100 protrudes from the front side of the flywheel magnet cover 93 so that the passenger can easily start the engine 60 by pulling the starter handle 101 from the front side.

  The pair of left and right stays 91 are respectively formed in an L shape, and mounting portions 91a extending in the vertical direction are mounted on both side portions of the engine body 61 by bolts 94, and brackets 91c are welded to support portions 91b extending rearward. Attachment portions 90a on the left and right sides of the fuel tank 90 are fastened and fixed to the bracket 91c by bolts 95.

  The front stay 92 is formed so as to extend left and right, and is fixed to the upper part of the front side of the flywheel magneto cover 93 by welding or the like. A pair of left and right mounting portions 90 b formed on the front side of the fuel tank 90 are fastened and fixed to the front stay 92 by bolts 96. A fuel cap 90c is provided at the upper part of the fuel tank 90, and the fuel is supplied by removing the fuel cap 90c. A fuel cock 90d is provided at the lower right side of the fuel tank 90. By opening the fuel cock 90d, fuel is supplied to the carburetor 65 via the fuel supply pipe 90e.

  A handle mounting portion 110 is fastened and fixed to the lower left portion of the engine main body 61 by a bolt 111. A manual operation handle 112 is provided on the handle attachment portion 110 so as to be rotatable about a rotation shaft 113. The position adjustment of the manual operation handle 112 is performed by tightening and fixing the positioning bolt 114 at a predetermined position of the arc-shaped groove 112b provided in the base 112a. State.

  In this outboard motor, the front end 30a of the swivel bracket 30 is in contact with a stopper 211 fixed to the clamp bracket 10, and can be tilted up with the tilt shaft 4 as a fulcrum. Further, the outboard motor of FIG. 1 shows a forward movement state, and when moving backward, the propulsion unit 50 is rotated around the axis center of the support cylinder 51 to be reversed forward and backward. The lifting prevention claw 120 fixed to the support cylinder 51 of the propulsion unit 50 by this reverse rotation is engaged with the support piece 121 fixed to the clamp bracket 10 so that the propulsion unit 50 is not lifted by the propulsive force of the propeller 52. To do.

  In addition, since the engine 60 of the propulsion unit 50 is not covered with a cowl, this outboard motor is directly exposed to seawater or water when used in the sea or a lake. It is easy to wash it. Further, since the fuel tank 90 is disposed above the engine body 61 so as to form a space 190, the space 190 can be easily washed with water.

  When this outboard motor travels in shallow water, for example, the occupant pulls the side support stay 91 toward the water in order to bring the propeller 52 onto the water surface, so that the propulsion unit 50 moves upward with the tilt shaft 4 as a fulcrum. Rotate to tilt up. The tilt shaft 4 is disposed behind the transom board 2 and below the upper end 2a, and the distance L1 between the position of the tilt shaft 4 and the center of gravity position G of the outboard motor is shortened. The load when tilting up can be greatly reduced. Therefore, the passenger can pull the engine 60 forward by hand, and the propulsion unit 50 can be easily tilted up.

  Next, the power transmission mechanism of the outboard motor will be described in detail with reference to FIGS. 4 is a cross-sectional view of the lower part of the upper casing and the lower casing, and FIG. 5 is an enlarged view showing a state in which the driving side bevel gear and the driven side bevel gear are engaged with each other.

  In this embodiment, the lower portion 157a of the upper casing 157 and the upper portion 158a of the lower casing 158 are fixed by screwing nuts 160 to the studs 159 provided on the upper portion 158a. Further, the lower portion 157 a of the upper casing 157 and the upper portion 158 a of the lower casing 158 are sealed by an O-ring 116.

  A flange portion 161 a of the propeller shaft housing 161 is fastened and fixed to the rear portion 158 d of the lower casing 158 by fastening bolts 162. A space between the rear portion 158 d of the lower casing 158 and the housing portion 161 b of the propeller shaft housing 161 is sealed by an O-ring 117.

  The drive shaft 53a in the upper casing 157 extends substantially vertically downward in the lower casing 158, and supports the lower end portion 53a1 of the drive shaft 53a to the lower casing 158 via the bearing 200 so as to be rotatable. .

  The support structure of the drive shaft 53a is as follows. A stepped portion 53a2 is provided on the outer periphery of the lower end portion 53a1 of the drive shaft 53a by cutting into a circumferential shape. A rolling bearing 201 is used as the bearing 200. The rolling bearing 201 includes an outer ring 201a, an inner ring 201b, and a ball 201c disposed between the outer ring 201a and the inner ring 201b. The lower casing 158 is formed with a circular recess 158a as viewed from above, and a step 158b is formed in the recess 158a. The rolling bearing 201 is provided in the recessed portion 158a by engaging the outer ring 201a with the step portion 158b. The lower end portion 53a1 of the drive shaft 53a is supported in a state where the stepped portion 53a2 contacts the inner ring 201b of the rolling bearing 201 and the end surface 53a11 of the lower end portion 53a1 floats without contacting the bottom surface 158a1 of the recessed portion 158a.

  A spline 53b is formed at an intermediate portion of the drive shaft 53a, and the spline 110a of the drive side bevel gear 110 is engaged with the spline 53b, whereby the drive shaft 53a and the drive side bevel gear 110 rotate integrally. An elastic member 111 is supported on the drive shaft 53a by a fixed member 112 at the position of the spline 53b, and a load is applied to the drive-side bevel gear 110 positioned above by the elastic member 111. As the elastic member 111, a wave washer, a spring washer, or the like can be used. In this embodiment, a wave washer is used. Further, although a circlip is used as the fixing member 112, a pin may be inserted into the drive shaft 53a for support.

  The shaft portion 110b of the drive side bevel gear 110 is rotatably supported by the lower portion 157a of the upper casing 157 via the bearing 113, and the bearing 113 is supported by the lower portion 157a so as not to fall by the circlip 115. The upper side of the spline 53b of the drive shaft 53a is sealed by a seal member 118 provided between the upper axis 157 and the lower portion 157a.

  A through-hole 161c is formed in the housing portion 161b of the propeller shaft housing 161, and a propeller shaft 53c is passed through the through-hole 161c in the front-rear direction, and an intermediate portion of the propeller shaft 53c is connected to the housing portion 161b via the bearing 120. It is supported by. A sealing material 122 that seals the space between the housing portion 161b and the propeller shaft 53c in a water-tight manner is provided so that water does not enter the through-hole 161c.

  A spline 53c1 is formed at one end of the propeller shaft 53c, and the spline 130a of the driven bevel gear 130 is engaged with the spline 53c1, and the propeller shaft 53c and the driven bevel gear 130 rotate integrally. Further, a nut 131 constituting a fastening member is screwed to one end portion of the propeller shaft 53c via a washer 132, and the driven side bevel gear 130 is fastened and fixed. The nut 131 is located between the drive shaft 53a and the driven bevel gear 130.

  The shaft portion 130b of the driven side bevel gear 130 is rotatably supported by the housing portion 161b via the bearing 120. The driving side bevel gear 110 positioned above and the driven side bevel gear 130 positioned below are meshed with each other. A boss portion 52a of the propeller 52 having a large diameter is fitted to the rear end side of the propeller shaft 53c extending substantially horizontally rearward from the through hole 161c of the propeller shaft housing 161, and is integrally formed by a bolt 54. It is fixed. A cap 55 is fixed to the boss portion 52 a with a bolt 56.

  In this embodiment, the output of the engine 60 is transmitted to the drive shaft 53a, and the rotational force transmitted to the drive shaft 53a is transmitted from the drive-side bevel gear 110 to the driven-side bevel gear 130, and the propeller 52 is transmitted via the propeller shaft 53c. Rotate in the forward direction. In this embodiment, the rotation direction of the drive shaft 53a and the propeller shaft 53c is one direction, and when moving backward, the propulsion unit 50 is rotated around the axis center of the support cylinder 51 to be reversed in the front-rear direction.

  The drive shaft 53a provided with the drive side bevel gear 110 has a lower end portion 53a1 on the drive side bevel gear 110 side engaged with a bearing 200 positioned concentrically with the drive shaft 53a on the lower casing 158, thereby driving the drive side bevel gear 110. 110 is a structure in which both ends of 110 are supported. On the other hand, since the driven bevel gear 130 is fastened and fixed to the propeller shaft 53c by the nut 131 constituting the fastening member, the rotational force transmitted to the drive shaft 53a is transmitted from the drive side bevel gear 110 to the driven side bevel gear 130, and the drive side bevel gear 130 Even if meshing due to meshing between 110 and the driven bevel gear 130 occurs, the displacement of the tooth surface positions of the driving bevel gear 110 and the driven bevel gear 130 can be suppressed, and durability and impact strength are improved.

  Further, even if the driven bevel gear 130 of the propeller shaft 53c receives an axial impact force due to the outboard motor thrusting into the shallow water, the driven bevel gear 130 is securely supported by the propeller shaft 53c, and the axial displacement And durability is improved. In addition, a nut 131 as a fastening member is positioned between the drive shaft 53a and the driven bevel gear 130, and the structure is compact.

  Further, a step portion 53a2 is provided on the outer periphery of the lower end portion 53a1 of the drive shaft 53a, the step portion 53a2 is in contact with the inner ring 201b of the rolling bearing 200, and the drive shaft 53a is supported, and the driving side bevel gear 110 and the driven side bevel gear 130 are provided. It is possible to prevent tooth contact due to the weight of the drive shaft at the time of meshing, and to improve normal tooth contact, it is possible to prevent abnormal noise and improve durability.

  Further, a fixed member 112 that supports the drive side bevel gear 110 is disposed on the drive shaft 53a, and an elastic member 111 that adds a load is disposed between the drive side bevel gear 110 and the fixed member 112. The drive-side bevel gear 110 located above is supported by the fixed member 112 via the elastic member 111, and the downward movement due to the weight of the drive-side bevel gear 110 itself can be restricted by the reaction force of the elastic member 111. The tooth contact of 110 is stabilized and the durability is improved.

  The present invention can be applied to an outboard motor that transmits an engine output to a drive shaft and transmits a rotational force transmitted to the drive shaft to a propeller shaft to obtain a propulsive force. The drive-side bevel gear and the driven-side bevel gear are It can be reliably supported with a compact structure.

It is a side view of the state where an outboard motor is mounted on a ship. It is a top view of the engine of an outboard motor. It is the side view which looked at the engine of the outboard motor from the advancing direction back. It is sectional drawing of the lower part of an upper casing, and a lower casing. It is an enlarged view which shows the state which mesh | engaged the drive side bevel gear and the driven side bevel gear.

Explanation of symbols

1 Hull 2 Transom board 4 Tilt axis 10 Clamp bracket
30 Swivel bracket 50 Propulsion unit 51 Support cylinder 52 Propeller 53 Power transmission mechanism 53a Drive shaft 53c Propeller shaft 59 Crankshaft 60 Engine 61 Engine body 70 Planetary gear unit 70a Transmission mechanism 90 Fuel tank 110 Drive-side bevel gear 111 Preload washer 112 Circlip 130 Drive side bevel gear 131 Nut 157 Upper casing 158 Lower casing 110 Drive side bevel gear 200 Bearing

Claims (3)

In an outboard motor that transmits the engine output to the drive shaft of the upper casing and transmits the rotational force transmitted to the drive shaft to the propeller shaft of the lower casing.
A drive-side bevel gear that rotates integrally with an intermediate portion of the drive shaft;
The lower end of the drive shaft is supported rotatably on the lower casing via a bearing,
At one end of the propeller shaft, it has a driven bevel gear that rotates integrally,
The driven bevel gear is fastened and fixed by a fastening member fastened to one end of the propeller shaft,
The fastening member is located between the drive shaft and the driven bevel gear;
An outboard motor characterized in that the driving side bevel gear located above and the driven side bevel gear located below are meshed. A step is provided on the outer periphery of the lower end of the drive shaft,
The bearing is a rolling bearing,
The outboard motor according to claim 1, wherein the stepped portion is in contact with an inner ring of the rolling bearing. A fixing member that supports the drive-side bevel gear is disposed on the drive shaft;
3. The outboard motor according to claim 1, wherein an elastic member for adding a load is disposed between the drive-side bevel gear and the fixing member.