JP3038937B2 - Outboard motor trim / tilt device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[Object of the invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outboard motor trim / tilt apparatus having an improved trim mechanism.

[0003]

2. Description of the Related Art FIG. 1 shows a configuration example of a trim / tilt type outboard motor.
It is shown in FIG.

An outboard motor main body 1 is composed of an upper unit 1a including an engine and a starter motor, a middle unit 1b including a drive shaft and the like, and a lower unit 1c including a transmission gear and a screw.

[0005] The outboard motor main body 1 includes a swivel bracket 2.
The swivel bracket 2 is rotatably connected to a clamp bracket 4 attached to the transom 3a of the hull 3 via a tilt pivot 5.

A trim / tilt device 6 is provided between the swivel bracket 2 and the clamp bracket 4, and the angle of attachment of the outboard motor body 1 to the hull 3 is determined by turning the swivel bracket 4 by the trim / tilt device 6. It is adjusted by movement.

The trim / tilt device 6 includes a tilt mechanism 7 for driving the swivel bracket 2 at a position near the tilt pivot 5 and a trim mechanism 8 for driving the swivel bracket 2 at a position farther from the tilt pivot 5.

The tilt mechanism 7 includes a clamp bracket 4
A tilt cylinder 7a whose lower end is rotatably supported via a support shaft 9, and a tilt piston rod 7b protruding above the tilt cylinder 7a. A swivel bracket is provided at the tip of the tilt piston rod 7b. 2 are connected via pins 10. In the tilt mechanism 7, the angle of a large “tilt range” is set by a link-like operation involving the swing of the tilt piston rod 7b.

On the other hand, the trim mechanism 8 has a trim cylinder 8a fixedly mounted rearwardly and upwardly from the clamp bracket 4, and a trim piston rod 8b projecting from the trim cylinder 8a and linearly moving forward and backward. The tip of the trim piston rod 8b is in contact with the surface of a trim pad 11 provided on the swivel bracket 2. Then, by the reciprocation of the trim piston rod 8b, a small "trim range" is mainly used for setting the cruising angle.
The angle setting is performed.

[0010]

In the trim mechanism 8 of the trim / tilt device 6, the trim piston rod 8b moves linearly, whereas the swivel bracket 2 rotates about the tilt pivot. Therefore, it is necessary to absorb the displacement of the contact surface and the change in the contact angle generated between the trim piston rod and the swivel bracket.

Therefore, conventionally, for example, as shown in FIG. 12, means for bringing the tip end of the trim piston rod 8b and the trim pad 11 of the swivel bracket 2 into spherical contact with each other is adopted, or as shown in FIG. In addition, a swingable end block 12 is attached to the tip of the rod, and two rollers 13 are provided on the trim pad 11 to take measures such as rolling contact, thereby absorbing deviations and angle changes. ing. A structure similar to that shown in FIG. 13 is also disclosed in Japanese Patent Application Laid-Open No. 62-247998.

The contact load between the tip of the trim piston rod 8b and the trim pad 11 is extremely large due to the outboard motor's own weight and the running thrust force.

In this case, in FIG. 12, the trim piston rod 8b and the trim pad 11 are both made of metal, but the metal contact is poor in slidability under a large contact load and generates abnormal noise. There is a problem of doing.

In the apparatus shown in FIG.
3 improves the slidability, but the end block 1
2, and a large load is received with a small contact area. Therefore, there is a problem that parts need to have higher hardness and durability than necessary, the unit cost of parts increases, and since the number of parts is large, the number of assembly steps is increased, and the manufacturing cost is increased.

The present invention has been made in view of such circumstances, and it is possible to suppress the generation of abnormal noise in the sliding portion of the trim mechanism, to ensure the reliability against the pressing load, and to reduce the cost of parts. It is another object of the present invention to provide an outboard motor trim / tilt device capable of reducing the number of parts. [Configuration of the invention]

[0016]

SUMMARY OF THE INVENTION The present invention provides a clamp bracket attached to a hull, a swivel bracket provided on the clamp bracket so as to be rotatable around a tilt pivot, and supporting an outboard motor body, and the clamp bracket. A trim piston rod provided linearly toward the rear of the hull, and a trim pad provided on the swivel bracket and in contact with a tip end of the trim piston rod, and a swivel bracket is provided by the advance / retreat of the trim piston rod. In the trim / tilt device of the outboard motor for performing the trim operation of the outboard motor main body by pushing and pulling, a metal end block is provided at the tip of the trim piston rod so as to swing freely, while the swivel bracket of the swivel bracket is provided. Trim pad with at least surface made of resin And, and the abutted an end block and the trim pad surface as a surface contact due to the flat surface, and always characterized by being allowed to hold the contact area or constant within the trim range.

[0017]

According to the present invention, the portion of the trim pad provided on the swivel bracket, which abuts on the trim piston rod, is made of resin, and the portion is in metal-to-resin contact. Sliding property is improved compared to
Generation of abnormal noise is suppressed.

Further, since the contact surface between the trim pad and the end block is a flat surface and is always in contact with a predetermined area or more in the trim range, the load is evenly distributed over the entire contact surface. Therefore, unlike line contact, there is no load concentration, and the reliability for the press-contact load can be ensured without requiring an excessively high hardness for the component material, thereby reducing the unit cost of the component.

In addition, since the number of parts is reduced, the number of assembling steps is reduced, and the manufacturing cost can be reduced.

The use of resin parts reduces the number of places where rust prevention must be taken into consideration, and in this regard, cost reduction can be achieved.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

<Embodiment 1> FIGS. 1 and 2 show the structure of this embodiment.

The overall structure of the trim / tilt device is substantially the same as that of the prior art shown in FIG. 11, and a clamp bracket attached to the hull and provided on the clamp bracket so as to be rotatable around a tilt pivot. And a swivel bracket for supporting the outboard motor main body. Further, the trim / tilt device includes a tilt mechanism for driving the swivel bracket at a position near the tilt pivot, and a trim mechanism for driving the swivel bracket at a position farther from the tilt pivot. The overall configuration of these is also substantially the same as the conventional example. Therefore, in the present embodiment, redundant description will be avoided, and only the main configuration will be illustrated and described in detail.

FIG. 1 shows a structure of a joint portion between a trim piston rod 21 of a trim cylinder 20 provided on a clamp bracket and a trim pad 23 provided on a swivel bracket 22 at a plurality of positions associated with the reciprocating operation of the trim piston rod 21. FIG. 2 is a view taken along the line AA in FIG.

As shown in FIG. 1, the trim piston rod 21 moves forward and backward within a predetermined trim range (see FIG. 11) along the axis a. The distal end portion of the trim piston rod 21 is formed in a ball shape, and a metal end block 24 is swingably provided on the ball-shaped distal end portion 21a, for example, in a universal joint shape. The end block 24 has, for example, a columnar shape or a polygonal column shape, and the top 24a is formed as a flat surface.

On the other hand, the trim pad 23 disposed on the swivel bracket 22 side is made of resin and has a stepped column shape.
The small diameter portion is fixed to the swivel bracket 22 by a fastener 30 such as a nut. This trim pad 23
The surface 23a on the large-diameter side is a flat surface facing the end block 24. The surface 23a of the trim pad 23 has, for example, an elliptical shape as shown in FIG.
The area is larger than the top 24a of the end block 24.

When the trim piston rod 21 moves forward from the basic position shown in FIG. 1A and pushes the trim pad 23 through the position shown in FIG. 1 to the position shown in FIG. 21 moves linearly along the axis a, while the trim pad 23 rotates about a tilt pivot (not shown) together with the swivel bracket 22, so that the joining position between the two is displaced, and the joining surface Then, a sliding action is performed. In this embodiment, in response to such a displacement, the end bracket 24 having a smaller area is provided on the surface of the trim pad 23 having a larger area.
Is set so that substantially the entirety of the top 24a always contacts in the trim range.

According to the configuration of the present embodiment described above, the joining surface between the trim pad 23 and the end block 24 comes into contact between the resin and the metal. Sound generation is suppressed.

Further, since the contact surface between the trim pad 23 and the end block 24 is a flat surface and is always in contact with a certain area or more in the trim range, the load is evenly distributed over the entire contact surface. Therefore, unlike line contact, there is no load concentration, and the reliability for the press-contact load can be ensured without requiring an excessively high hardness for the component material, thereby reducing the unit cost of the component.

Moreover, since the number of parts is reduced, the number of assembling steps is reduced, and the manufacturing cost can be reduced.

The use of resin parts reduces the number of places where rust prevention must be considered, and in this regard, cost reduction can be achieved.

<Embodiment 2> FIGS. 3 and 4 show the structure of this embodiment.

The main difference between this embodiment and the first embodiment is that the trim pad is composed of two parts, a metal part and a resin part. The other components are the same as those of the first and second embodiments, and the corresponding components are denoted by the same reference numerals as in FIG.

In this embodiment, as shown in FIG. 3, a trim pad 25 includes a metal holder 25a fixed to the swivel bracket 22, a resin pad held by the holder 25a and forming a contact portion with the end block 24. 25b. As shown in FIG. 4, for example, the holder 25a has a hexagonal outline, and a pad 25b is fitted and fixed in a circular recess formed on the surface thereof.

Also in this embodiment, the surface of the trim pad 25 is made of resin and abuts on the end block 24 in a flat surface contact state, so that a constant or more contact area is always maintained within the trim range. It has become.

Accordingly, the same effects as those of the first embodiment can be obtained, for example, the slidability can be improved and the generation of abnormal noise can be suppressed. Since the holder is held by the holder 25a, there is an advantage that the shear resistance of the trim pad due to the displacement of the contact surface is improved.

<Embodiment 3> FIGS. 5 and 6 show the structure of this embodiment.

The main difference between the present embodiment and the first and second embodiments is that the entire trim pad is made of metal and the resin portion exists only on the surface portion which is the contact surface with the end block. Since other components are the same as those of the first and second embodiments,
Corresponding parts are assigned the same reference numerals as in FIG. 1 and descriptions thereof are omitted.

In this embodiment, a resin coating film 26a is formed on the surface of the metal trim pad 26 which is the contact surface with the end block.

Also in this embodiment, since the surface of the trim pad 26 is formed of resin, the same effects as those of the first and second embodiments are obtained, such as improved slidability and suppression of generation of abnormal noise. Needless to say, according to the present embodiment, since the portion other than the resin coating film 26a of the trim pad 26 is made of metal, the performance against compression by load is improved.

<Embodiment 4> FIGS. 7 and 8 show the structure of this embodiment.

In this embodiment, the lubricating oil can be supplied to the contact surface between the trim pad and the end block. The other components are substantially the same as those in the second embodiment, and the corresponding components are denoted by the same reference numerals as in FIG. 3 and description thereof is omitted.

As shown in FIG. 7, the trim pad 25
Metal holder 25 fixed to swivel bracket 22
a and the end block 2 held by the holder 25a.
And a resin pad 25b forming four contact portions. As shown in FIG. 8, the holder 25a has a hexagonal outline, and a pad 25b is formed in a circular recess formed on the surface thereof.
Are fitted and fixed.

In this embodiment, the oil holes 27a for accommodating grease are provided at the axial centers of the holder 25a and the pad 25b.
27b are respectively formed. A grease nipple 28 for supplying grease to the oil hole 27a is provided at a small-diameter end of the holder 25a.

The oil hole 27b of the pad 25b is tapered so as to have a smaller diameter toward the end block 24, and a pin 2 having the same taper is provided in the oil hole 27b.
9 is housed so as to be able to protrude and retract in a state where it can partially protrude toward the end block 24 side. And this pin 29
Is urged toward the end block 24 by a compression coil spring 31 inserted into the oil hole 27a of the holder 25a.

At the position (a) in FIG. 9 where the outboard motor main body 1 is set in the vertical state, the end block 24 and the pad 25b are not in contact with each other. Of the pad 25b to close the oil hole 27b of the pad 25b. Therefore, in this state, the grease in the oil hole 27b is not discharged to the end block 24 side.

On the other hand, at the positions (b) and (c) in FIG. 9 where the trim operation is set on the outboard motor main body 1, the end block 24 and the pad 25b are in contact with each other. The end block 24 pushes the oil hole 27 b against the urging force of the compression coil spring 31. Therefore, in this state, grease in the oil hole 27b is discharged toward the end block 24, and the contact surface between the end block 24 and the pad 25b is lubricated. Therefore,
By repeating the states (a), (b), and (c), the contact surface is always in a necessary grease-up state, and the slidability of the contact surface is improved.

Although not shown, the pad 25b is separated from the end block 24 when the outboard motor is not used, and the pin 29 is pushed by the compression coil spring 31, so that the grease in the pad 25b does not leak.

If the inside of the pad 25b is constantly greased by lubrication from the grease nipple 28, there is no fear that the compression coil spring 31 is fixed or rusted.

According to the fourth embodiment, the same effects as those of the first to third embodiments can be obtained. However, since the slidability is improved by the grease-up action, the generation of abnormal noise can be suppressed. It will be more effective.

<Embodiment 5> FIGS. 9 and 10 show the structure of this embodiment.

This embodiment is a modification of the configuration that can supply lubricating oil to the contact surface between the trim pad and the end block.

That is, as for the contact component between the trim pad and the end block, the trim pad as a whole is integrally formed of resin, as in the first embodiment shown in FIGS. Is substantially the same as that of the fourth embodiment shown in FIGS.

Therefore, in this embodiment, the basic components such as the trim pad and the end block are shown in FIG.
The same reference numerals as in FIG. 7 denote the same components as those in FIG. 7, and a description thereof will be omitted.

According to the present embodiment, not only the same effects as those of the above-described embodiments can be obtained, but also remarkable effects such as improvement in slidability and suppression of generation of abnormal noise can be obtained by the grease-up action.

[0056]

As described above, according to the present invention, it is possible to suppress the generation of abnormal noise in the sliding portion of the trim mechanism, to ensure the reliability against the pressure load, and to reduce the cost of parts and the parts. Effects such as reduction of points can be achieved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of a trim / tilt device according to the present invention.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is a diagram showing a second embodiment of the trim / tilt device according to the present invention.

FIG. 4 is a view taken in the direction of arrow B in FIG. 3;

FIG. 5 is a diagram showing a third embodiment of the trim / tilt device according to the present invention.

FIG. 6 is a view taken in the direction of the arrow C in FIG. 5;

FIG. 7 is a diagram showing a fourth embodiment of the trim / tilt device according to the present invention.

FIG. 8 is a view taken in the direction of arrow D in FIG. 7;

FIG. 9 is a view showing a fifth embodiment of the trim / tilt device according to the present invention.

FIG. 10 is a view taken in the direction of arrow E in FIG. 9;

FIG. 11 is a diagram showing the entire outboard motor.

FIG. 12 is a diagram showing a conventional example.

FIG. 13 is a diagram showing another conventional example.

[Explanation of symbols]

 3 Hull 4 Clamp Bracket 5 Tilt Pivot 21 Trim Piston Rod 22 Swivel Bracket 23, 25, 26, Trim Pad 24 End Block

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-247998 (JP, A) JP-A-62-155193 (JP, A) JP-A-63-219498 (JP, A) 122995 (JP, U) Japanese Utility Model Hei 3-67293 (JP, U) Japanese Utility Model Application No. 64-5898 (JP, U) Japanese Utility Model Application No. 62-100297 (JP, U) Japanese Utility Model Application No. 61-132199 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B63H 20/08 F16C 11/00

Claims (1)

(57) [Claims] 1. A clamp bracket attached to a hull, a swivel bracket provided on the clamp bracket so as to be rotatable around a tilt pivot and supporting an outboard motor main body, and provided on the clamp bracket toward the rear of the hull. A trim piston rod that linearly moves forward and backward, and a trim pad that is provided on the swivel bracket and abuts on a tip end of the trim piston rod. In a trim / tilt device for an outboard motor for performing a trim operation of a main body, a metal end block is swingably provided at a tip end of the trim piston rod, and at least a surface of a trim pad of the swivel bracket is made of resin. Shall be formed,
A trim / tilt device for an outboard motor, wherein the end block and the surface of the trim pad are brought into contact with each other as a surface contact by a flat surface, and a constant contact area is always maintained within a trim range.