JP2003165492A - Outboard motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To sufficiently lubricate with the grease, and to secure a friction function. <P>SOLUTION: In this outboard motor 2, a propeller unit 6 is supported by a hull 1 through a swivel bracket 33, and the propeller unit 6 can be turned for steering in relation to the swivel bracket 33, and a bush is provided between a bearing part 33a of the swivel bracket 33 and a pivot part 6C10 of the propeller unit 6, and the friction member 7 is brought in pressure-contact with the pivot part 6C10 through a friction opening 75d of the bush to give the friction, and while the grease is supplied from a grease opening 76d to the pivot part 6C10. The inner surface of a pivot part side of the bush is formed with spiral grease grooves 75f and 76f, and a grease opening 76d is provided at a position corresponding to the spiral grease groove 76f, and the friction opening 75d is arranged at a position displaced from the spiral grease grooves 75f and 76f. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to outboard motors.

[0002]

2. Description of the Related Art Generally, in an outboard motor, a propulsion unit is supported by a hull via a swivel bracket, and the propulsion unit is rotatable and steerable with respect to the swivel bracket. There is a bush provided between the pivot part and the pivot part, and a friction member is pressed against the pivot part from the friction opening of the bush to give friction, and grease is supplied to the pivot part from the grease opening.

[0003]

In such a small outboard motor, the steering of the propulsion unit can be rotated 360 degrees, but the lubrication by grease is insufficient.

Further, the rear surface of the friction member is pressed by a bolt to apply a friction load, but it is displaced from the axial center of the pivot portion of the propulsion unit, and the friction function is insufficient.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an outboard motor that is sufficiently lubricated with grease and that can secure a friction function.

[0006]

In order to solve the above-mentioned problems and to achieve the object, the present invention has the following constitution.

According to a first aspect of the present invention, "a propulsion unit is supported on a hull via a swivel bracket, and the propulsion unit can be steered by rotating a steering handle with respect to the swivel bracket. A bush is provided between the bearing portion of the bracket and the pivot portion of the propulsion unit, a friction member is pressed against the pivot portion from the friction opening of the bush to give friction, and grease is supplied to the pivot portion from the grease opening. In the outboard motor, a spiral grease groove is formed on the inner surface of the bush on the side of the pivot portion, the grease opening is provided at a position corresponding to the spiral grease groove, and the friction is provided at a position deviated from the spiral grease groove. An outboard motor with an opening. ].

According to the first aspect of the present invention, the grease is spread over the inner surface of the bush on the side of the pivot portion, the lubrication by the grease is sufficient, and the adhesion of the grease to the friction member can be reduced. Can be secured.

According to a second aspect of the present invention, the outboard motor according to the first aspect is characterized in that the bush has a non-slip rib that abuts the friction member on the circumferential side of the friction opening. . ].

According to the second aspect of the present invention, the non-slip ribs of the bush come into contact with the friction member to prevent the bush from slipping, and the grease is more reliably spread over the inner surface of the bush on the side of the pivot portion. There is sufficient lubrication.

According to a third aspect of the present invention, "a friction pressing member provided on the swivel bracket is capable of pressing the friction member in the axial direction of the pivot portion, and the friction pressing member is attached to the outboard motor center. The outboard motor according to claim 1 or 2, wherein the outboard motor is arranged on the opposite side of the steering handle from the handle. ].

According to the third aspect of the invention, the friction function can be secured by pressing the friction member in the axial direction of the pivot portion. Further, the handle of the steering handle can be held with one hand from the hull side to rotate the propulsion unit, the friction pressing member can be brought close to the hull side and operated with the other hand, and the workability is improved.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of an outboard motor of the present invention will be described in detail with reference to the drawings. 1 is a side view of the outboard motor, FIG. 2 is a front view of the outboard motor, FIG. 3 is a plan view of the outboard motor, FIG. 4 is a vertical sectional view of a case portion of the outboard motor, and FIG. 6 is a front view of the case portion of FIG. 6, FIG. 6 is a cross-sectional view of the swivel bracket portion in the forward state, FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. 6, and FIG. 8 is a side view of the first bush half body. 9
Is a plan view of the first bush half, and FIG. 10 is XX of FIG.
FIG. 11 is a side view of the first bush half, showing a spiral grease groove, FIG. 12 is a side view of the second bush half, and FIG. 13 is a plan view of the second bush half. , FIG. 14
Is a side view of the second bush half showing a helical grease groove,
FIG. 15 is a sectional view taken along line XV-XV in FIG.

At the stern of the hull 1 of a small boat, there is a transom board 1a, and the clamp bracket 3 of the outboard motor 2 is sandwiched between the transom board 1a and the transom board 1a.
It is fixed by the tightening member 4. The clamp bracket 3 is provided with a swivel bracket 33 via a tilt shaft 5, and the propulsion unit 6 uses the tilt shaft 5 as a fulcrum.
Is provided so that it can be tilted up.

The propulsion unit 6 includes a top cowl 6A,
It has a bottom cowl 6B, an upper case 6C, and a lower case 6D. Top cowl 6A and bottom cowl 6
The engine 9 and the like are housed inside B. A choke knob 10 and a starter handle 11 project from the front side of the top cowl 6A, and a fuel cap 12 projects from the upper side. Further, a pair of left and right air intakes 34 are formed in the upper portion of the top cowl 6A, and air is introduced from the air intakes 34 into the top cowl 6A and the bottom cowl 6B,
The intake of the engine 9 is performed.

A carrying handle 13 is provided on the upper rear side of the upper case 6C, and a bottom cowl 6B is provided.
On the left side surface of the steering wheel 7 is a bar-shaped steering handle 7 protruding forward.
The carrying unit 13 or the steering handle 7 allows the propulsion unit 6 to rotate 180 degrees to move from forward to backward or from backward to forward. Further, a shift lever 8 for connecting the propulsive force and switching it to neutral is attached to the right side surface of the bottom cowl 6B.

The drive shaft 15 driven by the engine 9 extends substantially vertically downward in the upper case 6C and the lower case 6D. The upper case 6C and the lower case 6D are assembled by a tightening bolt 16.

A small diameter bevel gear 17 is fixed to the lower end of the drive shaft 15, and the bevel gear 17 meshes with a large diameter bevel gear 18. The bevel gear 18 is rotatably supported by the lower case 6D via a bearing 19 to reduce the rotation of the drive shaft 15.

The propeller housing 20 is fixed to the rear end of the lower case 6D by a plurality of bolts 21. A propeller shaft 22 penetrates the propeller housing 20 in the front-rear direction, and an intermediate portion of the propeller shaft 22 is rotatably supported by the propeller housing 20 via a bearing 23.

A boss portion 25a of a propeller 25 is fitted on the rear end side of the propeller shaft 22 and is integrally fixed by a nut 26. Boss 25a and collar 27
Are integrated via a rubber damper 28 and a collar 27
Is spline-engaged with the rear end of the propeller shaft 22, so that the propeller 25 rotates integrally.

Above the propeller 25, the propeller 2
A cavity plate 30 is attached to the lower case 6D by bolts 31 so as to be close to the outer periphery of the lower casing 5. An exhaust passage 32 is formed in the upper case 6C and the lower case 6D, and an outlet 32a of the exhaust passage 32 is formed in the lower front portion of the cavity plate 30.

A dog clutch 40 is provided on the front end side of the propeller shaft 22 so as to be movable in the axial direction, and is biased by a spring 41 so as to always abut the shift pin 42. The shift pin 42 is shift-operated by the shift rod 50. The shift rod 50 has an upper portion 50.
It consists of a and a lower part 50b.
Can be connected by connecting means 60.

When the shift lever 8 is shifted, the shift rod 50 moves up and down around the shift shaft 55 via the link 56, and the shift pin 42 is pushed by the operating portion 50b1 provided in the lower portion 50b. Then, the clutch convex portion 40a of the dog clutch 40 is released from the mesh with the clutch concave portion 18a of the bevel gear 18, and the rotation of the propeller shaft 22 is stopped.

On the other hand, if the operating portion 50b1 does not push the shift pin 42, the dog clutch 40 is pushed by the spring 41 at this connecting position, and the clutch convex portion 40a of the dog clutch 40 is changed to the clutch concave portion 18 of the bevel gear 18.
The propeller shaft 22 is integrally rotated by meshing with a.

The upper portion 50a and the lower portion 50 of the shift rod 50
The connecting means 60 for connecting b is a pair of tightening plates 6
1, 62 and a tightening bolt 63. The pair of tightening plates 61 and 62 are temporarily fixed by tightening bolts 63 and are held by the washer 64 on the upper portion 50 a of the shift rod 50.

The lower portion 5 of the shift rod 50 is temporarily fixed to the upper portion 50a of the shift rod 50 with a pair of fastening plates 61 and 62.
0b to the tightening plates 61, 62 and the upper part 50a
The lower part 50b and the lower part 50b at predetermined positions to tighten the tightening bolt 6
The pair of tightening plates 61 and 62 is tightened and fixed by 3.

Work openings 70a and 70b are provided at a pair of left and right facing positions at a portion of the case corresponding to the connecting portion between the upper portion 50a and the lower portion 50b of the shift rod 50.

In the upper case 6C which is the case of the propulsion unit 6, the upper portion 6C1 of the portion where the drive shaft 15 is arranged has a circular cross section, and the lower portion 6C2 has a substantially wing cross section which is long in the front-rear direction. Work opening 7 on the front
0a and 70b are provided.

The working openings 70a and 70b are used for the lid member 7.
1, 72 can be closed, and the lid members 71, 7
2 is made of a rubber member, and the working openings 70a, 70b are sealed by lid members 71, 72.

The upper portion of the drive shaft 15 located behind the shift rod 50 is pivotally supported by the crankcase 90 of the engine 9 via a bearing 80.
The lower part is axially supported by the lower case 6D via a bearing 81. The drive shaft 15 drives the water pump 82, and water is sucked into the water passage 84 from the water hole 83 formed in the lower case 6D. Water discharged from the water pump 82 flows from the water passage 85 to the water pipe 86.
Is supplied to a water passage 87 formed between the upper case 6C and the crankcase 90 via the
Is sent to each part of the engine 9 to cool the engine 9. The water passage 87 is formed by a groove 6C3 formed on the joint surface of the upper portion 6C1 of the upper case 6C and a groove 90a1 formed on the joint surface of the lower portion 90a of the crankcase 90.

Excess pilot water from the water passage 87 drops from a water discharge hole 88 formed in the upper portion 6C1 of the upper case 6C and is drained to the outside.

The upper case 6C of the propulsion unit 2 is
The swivel bracket 33 is rotatably supported by the bearing portion 33 a, and the propulsion unit 2 can be rotated 180 degrees with respect to the swivel bracket 33 by holding the carrying handle 13 to change the forward and reverse positions.

The swivel bracket 33 has a water discharge hole 8
A separate gutter member 89 for receiving the pilot water falling from 8 and flowing it to the side other than the hull side is attached. The gutter member 89 is located at a lower position of the trajectory drawn by the water discharge hole 88 when the propulsion unit 6 is rotated and on the hull side portion, and is attached to the swivel bracket 33.

As described above, the propulsion unit 6 may be rotated 180 degrees with respect to the swivel bracket 33 to change the forward and backward positions.
Is located on the rear side, and the pilot water falls from the rear side of the propulsion unit 6 and is discharged. On the other hand, the propulsion unit 6
When turning backward by 0 degree and moving backward, the water discharge hole 88 changes its position to the front side and becomes the hull side, but the pilot water drops from the water discharge hole 88 onto the gutter member 89, and this gutter member 89 The pilot water that has fallen is prevented from entering the hull side because it is discharged by flowing it to the side other than the hull side.

In this embodiment, the propulsion unit 6 can be rotated and steered with respect to the swivel bracket 33 by the steering handle 7, and as shown in FIG. 6 and FIG.
The first bush half body 75 and the second bush half body 76 are arranged between the bearing portion 33a of the swivel bracket 33 and the pivot portion 6C10 of the propulsion unit 6.

The first bush half 75 is shown in FIGS.
As shown in FIG. 1, ribs 75b and 75c are provided above and below a bush portion 75a having a semicircular cross section, and a friction opening 75d is formed. The bush portion 75a is formed with a pair of anti-slip ribs 75e on the circumferential side of the friction opening 75d. A pair of spiral grease grooves 75f are formed on the inner surface of the bush portion 75a on the side of the pivot portion so as to cross each other, and a friction opening 75d is formed at a position outside the spiral grease groove 75f.

As shown in FIGS. 12 to 15, the second bush half body 76 has ribs 76b and 76c above and below a bush portion 76a having a semicircular cross section, and the grease opening 7 is provided.
6d is formed. A pair of spiral grease grooves 76f are formed on the inner surface of the bush portion 76a on the side of the pivot portion so as to cross each other, and a grease opening 76d is formed at a position corresponding to the spiral grease groove 75f.

The first bush half 75 and the second bush half 76 are arranged so as to face each other as shown in FIG.
A friction member 77 is arranged in the friction opening 75d of the first bush half 75. The friction member 77 comprises a rubber 77a and a plate member 77b, and a plate member 7 of the friction member 77 is fixed by a friction pressing member 78 screwed to the bearing portion 33a of the swivel bracket 33.
Friction is applied by pressing 7b and pressing the rubber 77a against the pivot portion 6C10 of the propulsion unit 6.

The friction pressing member 78 has a threaded portion 78a at its tip screwed to the mounting portion 33a1 of the bearing portion 33a and is urged by a spring 78A to prevent rotation. The friction pressing member 78 can be pressed in the axial direction of the pivot portion 6C10, and the friction pressing member 78 is arranged on the opposite side of the outboard motor center L from the handle 7a of the steering handle 7.

A cover 79 is attached to the pivot portion 6C10.
Are attached by bolts 79A, and the head of the friction pressing member 78 projects outside from an opening 79a formed in the cover 79. By rotating the friction pressing member 78 from the outside, the pressure contact force of the friction member 76 is adjusted to give a predetermined friction.

As described above, the friction pressing member 78 presses the friction member 77 in the axial direction of the pivot portion 6C10, whereby the friction function can be secured.
In addition, holding the handle 7a of the steering handle 7 from one side of the hull with one hand to rotate the propulsion unit 6, the friction pressing member 7 is rotated.
8 can be brought closer to the hull side and easily operated with the other hand, and workability is improved.

Further, a grease nipple 98 is provided in the bearing portion 33 corresponding to the grease opening 76d of the second bush half body 76.
It is screwed to the mounting portion 33a2 of a. The grease is supplied from this grease nipple 98, and the second bush half 7
The spiral grease groove 76f of No. 6 guides the grease to the spiral grease groove 75f of the first bush half 75, and the grease spreads.

Therefore, the lubrication between the bearing portion 33a of the swivel bracket 33 and the pivot portion 6C10 of the propulsion unit 6 is sufficient, and the adhesion of the grease to the friction member 77 can be reduced to reduce the friction. Functions can also be secured.

Further, in the first bush half body 75 and the second bush half body 76, the anti-slip ribs 75e of the first bush half body 75 come into contact with the friction member 77 to prevent the bushes from slipping. Grease is surely spread on the inner surface of the bushing on the pivot side, and lubrication with grease is sufficient.

[0045]

As is apparent from the above description, in the invention described in claim 1, the grease is spread over the inner surface of the bush on the side of the pivot portion, the lubrication by the grease is sufficient, and the grease is attached to the friction member. Can be reduced,
The function of friction can also be secured.

According to the second aspect of the present invention, the anti-slip ribs of the bush come into contact with the friction member to prevent the bush from slipping, and the grease is spread more reliably on the inner surface of the bush on the side of the pivot portion, and the lubrication by the grease is sufficient. Is.

In the third aspect of the invention, the friction function can be secured by pressing the friction member in the axial direction of the pivot portion. Further, the handle of the steering handle can be held with one hand from the hull side to rotate the propulsion unit, the friction pressing member can be brought close to the hull side and operated with the other hand, and the workability is improved.

[Brief description of drawings]

FIG. 1 is a side view of an outboard motor.

FIG. 2 is a front view of an outboard motor.

FIG. 3 is a plan view of an outboard motor.

FIG. 4 is a vertical sectional view of a case portion of the outboard motor.

FIG. 5 is a front view of a case portion of the outboard motor.

FIG. 6 is a cross-sectional view of a swivel bracket portion in a forward movement state.

7 is a cross-sectional view taken along the line VII-VII of FIG.

FIG. 8 is a side view of the first bush half.

FIG. 9 is a plan view of the first bush half.

10 is a cross-sectional view taken along line XX of FIG.

FIG. 11 is a side view of the first bush half showing the spiral grease groove.

FIG. 12 is a side view of the second bush half.

FIG. 13 is a plan view of the second bush half.

FIG. 14 is a side view of the second bush half showing the spiral grease groove.

15 is a sectional view taken along line XV-XV in FIG.

[Explanation of symbols]

1 hull 2 outboard motor 6 propulsion unit 6C10 pivot part 9 engine 15 drive shaft 22 Propeller shaft 25 propeller 33 swivel bracket 33a Bearing part 75 First bush half 75d friction opening 75f spiral grease groove 76 Second Bush Half 76d grease opening 76f spiral grease groove 77 Friction member 78 Friction pressing member 98 grease nipple

Claims (3)

[Claims] 1. A propulsion unit is supported on a hull via a swivel bracket, and the propulsion unit can be steered by rotating a steering handle with respect to the swivel bracket, and the bearing portion of the swivel bracket and the propulsion unit. In the outboard motor, a bush is provided between the pivot portion of the bush, a friction member is pressed against the pivot portion from a friction opening of the bush to provide friction, and grease is supplied from the grease opening to the pivot portion. Characterized in that a spiral grease groove is formed on the inner surface of the pivot part side, the grease opening is provided at a position corresponding to the spiral grease groove, and the friction opening is arranged at a position deviated from the spiral grease groove. Outboard motor to do. 2. The outboard motor according to claim 1, wherein the bush has a non-slip rib that is in contact with the friction member on the circumferential side of the friction opening. 3. A friction pressing member provided on the swivel bracket can press the friction member in the axial direction of the pivot portion, and the friction pressing member serves as a handle of the steering handle with respect to an outboard motor center. The outboard motor according to claim 1 or 2, wherein the outboard motor is arranged on the opposite side.