JPH0769289A - Trim/tilt device for marine pusher - Google Patents

Abstract

PURPOSE:To generate large trim up force without spoiling an impact absorbing property by means of a small device by constituting a cylinder device supported with a hull or a marine pusher through engagedly fitting a trim piston, a tilt piston and a cushioning piston in a cylinder. CONSTITUTION:A cylinder device 11 is constituted as a cylinder unit 33 in which a cylinder 31 is slidably arranged in a cylinder housing 32, and a trim piston 34 is fixed to the base end part of the cylinder 31 and slidably provided in the cylinder housing 32. Further a tilt piston 35 slidable in the cylinder 31 and capable of being contacted with the trim piston 34 is provided, and a cushioning piston 37 slidable in the cylinder 31, fixed to a piston rod 36, and having a cushioning valve 55 is provided. Either of the cylinder housing 32 or the piston rod 36 is connected to a hull, the other is connected to an outboard engine, and charge/discharge of pressure oil to the up chamber 45 and the down chambers 46, 47 in the cylinder unit 33 is controlled by means of a working oil changeover device 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trim / tilt device for a boat propulsion device which is suitable for use in outboard motors, outboard motors and the like.

[0002]

2. Description of the Related Art A trim / tilt device used for a propulsion device for a ship, for example, an outboard motor, has a cylinder device disposed between a hull and an outboard motor tiltably supported by the hull. The outboard motor is trimmed and tilted by expanding and contracting the cylinder device.

A power trim / tilt device for an outboard motor disclosed in Japanese Patent Publication No. 61-45599 has been proposed.
In this conventional example, a plurality of trim pistons integrally connected in series via a connecting sleeve are arranged in a hydraulic cylinder, and a tilt piston is arranged in the connecting sleeve. Trim-up force is generated. Further, since there is only one hydraulic cylinder and the tilt piston is arranged in the trim piston assembly (connection sleeve), the trim / tilt device can be downsized.

[0004]

By the way, it is necessary to absorb the collision energy when an outboard motor collides with a fluid or the like while riding on an underwater obstacle such as a reef during traveling. This absorption is performed by tilting the outboard motor to the tilt region. However, in the conventional example described in the above publication, since the tilt piston is formed in the connecting sleeve with a small diameter, the pressure receiving area is small, the pressure in the internal chamber is high, and the plate thickness of the sleeve is high or high. Sealing performance is required.

If the connecting sleeve has a large diameter and the tilt piston also has a large diameter, the hydraulic cylinder must be made large in order to increase the trim-up force, resulting in an increase in size of the apparatus.

The present invention has been made in consideration of the above circumstances, and even if the device is small, the trim / tilt of a marine propulsion device capable of generating a large trim-up force without impairing shock absorption. The purpose is to provide a device.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a cylinder device is arranged between a hull and a marine propulsion device tiltably supported on the hull, and the cylinder device trims the marine propulsion device. And a trim / tilt device for a boat propulsion device that is tilted, the cylinder device includes a cylinder unit in which a cylinder is slidably disposed in a cylinder housing, and the cylinder unit is provided so as to project from the cylinder housing. A trim piston fixed to the base end of the cylinder and slidably accommodated in the cylinder housing within a predetermined range, and a tilt provided slidably accommodated in the cylinder and abuttable on the trim piston. The piston and the cylinder are slidably accommodated in the cylinder, are fixed to the piston rod, and have a buffer valve. A shock-absorbing piston that is placed, and one of the cylinder housing and the piston rod is connected to the hull and the other is connected to the marine vessel propulsion unit, and further defined by the tilt piston and the trim piston. The up chamber and the down chamber in the cylinder unit are selectively communicated with the working fluid supply pump by the working fluid switching device.

[0008]

Therefore, according to the trim / tilt device of the marine vessel propulsion apparatus according to the present invention, the trim piston is pushed up by the hydraulic oil supplied to the up chamber of the cylinder unit and the piston rod is moved through the cylinder. When the tilting piston is pressed at the same time as the up force acts on the piston rod, the up force acts on the piston rod through the buffer piston. Further, after the movement of the trim piston is restricted, only the tilt piston is pressed by the hydraulic oil, and the piston rod is further moved (projected) via the buffer piston to perform the tilt-up.

Since the tilt piston is housed in the cylinder and the trim piston is housed in the cylinder housing together with the cylinder, the structure of the cylinder device can be made compact and the trim / tilt device can be made compact. That is, in the trim stroke, the cylinder itself serves as a pressure receiving portion (large pressure receiving area), so that a large trim up force can be obtained. Therefore, it is not necessary to increase the diameter of the cylinder,
There is no adverse effect that the tilt up / down speed becomes slow.

Further, it is not necessary to reduce the diameter of the cylinder as described above, the diameter of the buffer piston accommodated in the cylinder is not reduced, and the buffer piston can have a sufficient pressure receiving area. It can absorb energy well.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a trim / outboard motor trim / tilt device to which an embodiment of a trim / tilt device for a marine propulsion device according to the present invention is applied.
Shows the tilt device, (A) shows the full trim down state,
FIG. 6B is a cross-sectional view showing a full tilt-up state. FIG. 2 shows the trim and tilt device of FIG.
FIG. 4A is a cross-sectional view showing a trim-up state and FIG. FIG. 3 is a side view showing an outboard motor provided with the trim / tilt device of FIGS. 1 and 2.

As shown in FIG. 3, the outboard motor 1 is constructed by mounting an engine 4 covered with a cowling 5 on a propulsion unit 3 having a propeller 2. This outboard motor 1
Is supported so as to be tiltable with respect to the hull 6 by a mounting bracket 7 fixed to the hull 6. When the propeller 2 of the outboard motor 1 is rotated in the forward and reverse directions by the engine 4, the hull 6 moves forward or backward.

A cylinder device 11 of a trim / tilt device 10 is arranged between the outboard motor 1 and the mounting bracket 7, and the expansion / contraction of the cylinder device 11 causes the outboard motor 1 to perform a trim operation and a tilt operation. The trim operation changes the sailing attitude of the hull by tilting the outboard motor against the thrust of the screw during high speed running. The tilting operation tilts the outboard motor against the weight of the outboard motor while the boat is stopped.

As shown in FIG. 1A, the cylinder device 1
1 is a hydraulic oil supply pump 1 via a hydraulic oil switching device 12.
3 and the drain tank 14. The hydraulic oil switching device 12 has a direction switching valve 15, and the direction switching valve 15
Is configured by accommodating the spool 17 in the sleeve 16 and installing check valves 18 and 19 at both ends of the sleeve 16. The inside of the sleeve 16 is partitioned by the spool 17 into an up-side valve chamber 20A and a down-side valve chamber 20B. Further, the check valves 18 and 19 are provided so as to be opened by being pressed by the pressing element 20 of the spool 17.

The hydraulic oil supply pump 13 includes an electric motor 21.
Is driven to rotate in the forward and reverse directions. Two pump supply / discharge pipes 22 and 23 are connected to the hydraulic oil supply pump 13. Of these, the pump supply / discharge pipe 22 is connected to the drain tank 14 via a check valve 24, and the direction switching valve 15 is connected. Is connected to the up side valve chamber 20A. Further, the pump supply / discharge pipe 23 is connected to the drain tank 1 via the check valve 25.
4 and also to the down side valve chamber 20B of the direction switching valve 15.

The check valve 18 of the direction switching valve 15 is connected to the switching device supply / discharge pipe 26, and the drain tank 14 is connected to the switching device supply / discharge pipe 26 via the up blow valve 27. The check valve 19 of the direction switching valve 15 is connected to a switching device supply / discharge pipe 28, and the drain tank 14 is connected to the switching device supply / discharge pipe 28 via a thermal blow valve 29. A down blow valve 30 is arranged in the pump supply / discharge pipe 23 upstream of the direction switching valve 15.

Therefore, at the time of normal rotation of the hydraulic oil supply pump 13, as shown by the solid arrow in FIG.
The working oil flows from the drain tank 14 to the pump supply / discharge pipe 22 via 5, and the working oil reaches the upside valve chamber 20A of the direction switching valve 15. At this time, check valve 18
Is opened by hydraulic pressure, hydraulic oil flows to the switching device supply / discharge pipe 26, and the check valve 19 is also opened by being pressed by the pressing element 20 of the spool 17, and from the cylinder device 11 to the switching device supply / discharge pipe 28. The returned hydraulic oil is supplied to the pump supply / discharge pipe 23.
Through the hydraulic oil supply pump 13.

When the hydraulic oil supply pump 13 is rotated in the reverse direction, as shown by the broken line arrow in FIG.
4, the hydraulic oil in the drain tank 14 flows to the hydraulic oil supply pump 13, and the down side valve chamber 20B of the direction switching valve 15
To the inside. The check valve 19 of the direction switching valve 15 is opened by hydraulic pressure, the working oil is guided to the switching device supply / discharge pipe 28, and the check valve 19 of the direction switching valve 15 is also pressed.
The hydraulic oil pressed by 0 to open the valve and returned from the cylinder device 11 is guided to the hydraulic oil supply pump 13 via the switching device supply / discharge pipe 26, the up-side valve chamber 20A, and the pump supply / discharge pipe 22.

In the cylinder device 11, the cylinder unit 33 having the cylinder 31 and the cylinder housing 32, the trim piston 34 fixed to the cylinder 31, and the cylinder 31 slidably in a liquid-tight manner. The tilt piston 35 accommodated and the cylinder 31
A shock-absorbing piston 37 which is slidably housed in a liquid-tight manner and is fixed to a piston rod 36. A base end connecting portion 38 is formed at the base end of the cylinder housing 32 of the cylinder unit 33, and the piston rod 36
A tip connecting portion 39 is formed at the tip of the. Either the base end connecting portion 38 or the tip end connecting portion 39 is connected to the outboard motor 1
And the other is connected to the mounting bracket 7, respectively.

A trim piston 34 is joined to the base end of the cylinder 31 by screwing or the like, and the trim piston 34 is housed in the cylinder housing 32 so as to be slidable in a liquid-tight manner. A stopper cap 40 is attached to the cylinder housing 32. A part of the outer peripheral surface of the cylinder 31 is fluid-tightly slidable by the stop cap 40. The trim piston 34 includes the stopper 41 of the cylinder housing 32 and the stopper cap 40.
In the range (trim stroke L ₁ ; FIG. 2) in which the cylinder 31 abuts, the cylinder 31 also reciprocates in the above range. When the cylinder 31 reciprocates in this range, the cylinder 31 is provided so as to project from the cylinder housing 32.

A support bolt 42 is mounted on the cylinder housing 32, and a guide rod 43 is screwed onto the support bolt 42. The guide rod 43 is provided upright in the cylinder 31 and extends into the hollow portion 48 (described later) of the piston rod 36. The guide rod 43 is formed in a hollow shape having a hollow portion 43A.
Further, a bellows 44 is mounted between the cylinder 31 and the stopper cap 40 to protect the sliding surface on which the cylinder 31 slides on the stopper cap 40.

The tilt piston 35 and the buffer piston 37 are penetrated by the guide rod 43 and slide on the outer peripheral surface of the guide rod 43 in a liquid-tight manner. Of these, the tilt piston 35 is provided so as to be able to contact the contact portion 44 of the trim piston 34. The interior of the cylinder unit 33 surrounded by the cylinder 31 and the cylinder housing 32 by the trim piston 34, the tilt piston 35, and the buffer piston 35 is located in the up chamber 45 and the main down chamber 46.
Is divided into Further, the cylinder housing 32, the cylinder 31, the trim piston 34, and the stopper cap 40
The sub-down chamber 47 is formed by being surrounded by.

On the other hand, the piston rod 36 has a hollow portion 48.
And a small flow path 49 is formed on the side where the buffer piston 37 is fixed. The small flow path 49 connects the main down chamber 46 and the hollow portion 48 of the piston rod 36. In addition, the support bolt 4
A bolt supply / discharge channel 50 is formed in the valve 2, and the bolt supply / discharge channel 50 is communicated with the hollow portion 43A of the guide rod 43. Housing supply / discharge channels 51 and 52 are formed in the cylinder housing 32. Housing supply / discharge channel 51
Communicates the up chamber 45 with the switching device supply / discharge pipe 26 of the hydraulic oil switching device 12. In addition, the housing supply / discharge channel 5
2 connects the switching device supply / discharge pipe 28 of the hydraulic oil switching device 12 and the bolt supply / discharge flow passage 50 of the support bolt 42.
Therefore, the switching device supply / exhaust pipe 28 passes through the housing supply / exhaust flow passage 52, the bolt supply / exhaust flow passage 50, the hollow portion 43A of the guide rod 43, the hollow portion 48 of the piston rod 36, and the small flow passage 49, and the main down passage. It communicates with the chamber 46. Further, the sub-down chamber 47 includes check valves 53 and 54.
Is connected to the housing supply / discharge channel 52 via.

A buffer valve 55 and a return valve 56 are provided on the buffer piston 37. Figure 2
As shown in (B), only the buffer piston 37 slides at the time of collision with driftwood or the like, and the hydraulic oil in the main down chamber 46 passes through the buffer valve 55 and the hydraulic chamber between the buffer piston 37 and the tilt piston 35. Guided into 57. During this time, the fluid resistance of the hydraulic oil flowing through the buffer valve 55 absorbs the impact energy. Further, the return valve 56 allows the flow of the hydraulic oil from the oil chamber 57 to the main down chamber 46, and after absorbing the shock, the buffer piston 37 is returned to the position of the tilt piston 35 by the own weight of the outboard motor 1. .

Next, the operation will be described. (1) Trim-up operation To perform the trim-up operation, see Fig. 1 (A) and Fig. 2.
As shown in (A), the hydraulic oil supply pump 13 is rotated in the forward direction, and the hydraulic oil from the drain tank 14 is guided to the switching device supply / discharge pipe 26 via the up side valve chamber 20A of the direction switching valve 15,
This hydraulic oil is pressure-fed from the housing supply / discharge passage 51 of the cylinder housing 32 to the up chamber 45. The hydraulic oil guided to the up chamber 45 presses the trim piston 34 upward in FIG. 1A, and the up force acts on the piston rod 36 via the cylinder 31, and at the same time, the tilt piston 35 also receives the up force. The tilt piston 35 also slides in the same direction, and an up force acts on the piston rod 36 via the buffer piston 37, causing the piston rod 36 to slide upward in FIG. .

During the trim-up operation, the hydraulic oil in the main down chamber 46 is supplied to the small passage 49 and the hollow portion 48 of the piston rod 36, the hollow portion 43A of the guide rod 43, and the bolt supply / discharge passage of the support bolt 42. It is guided to the housing supply / discharge channel 52 via 50. On the other hand, sub-down chamber 4
The hydraulic oil in 7 is also guided to the housing supply / discharge passage 52 through the check valve 54. The hydraulic oil thus guided to the housing supply / discharge flow path 52 reaches the down side valve chamber 20B of the direction switching valve 15 from the switching device supply / discharge pipe 28 of the hydraulic oil switching device 12, and the check valve 19 and the pump supply. It returns to the hydraulic oil supply pump 13 via the drain pipe 23. During the trim-up operation, the trim piston 34 moves by the trim stroke L, contacts the stopper cap 40, and stops.

(2) Tilt-up operation As shown in FIGS. 2 (A) and 1 (B), when the working oil supply pump 13 is further rotated in the forward direction to continue supplying working oil to the up chamber 45, the tilt piston 35 is moved. Is the trim piston 34
The contact portion 44 moves away from the contact portion 44 and moves upward in the drawing.
From this point, the hydraulic oil presses only the tilt piston 35, and moves the piston rod 36 in the same direction by the tilt stroke M via the buffer piston 37. When the buffer piston 37 comes into contact with the inner surface of the upper end of the cylinder 31,
Tilt up ends.

After the tilt-up is completed, when the hydraulic oil is further supplied from the hydraulic oil supply pump 13, the hydraulic oil switching device 12
Also, the hydraulic pressure in the cylinder device 11 rises, the up blow valve 27 opens, and an abnormal pressure rise in the cylinder device 11 and the hydraulic fluid switching device 12 is prevented.

(3) Tilt down operation To tilt down, as shown in FIGS. 1 (B) and 2 (A), the hydraulic oil supply pump 13 is rotated in the reverse direction so that the hydraulic oil from the drain tank 14 is directed. It is guided to the down side valve chamber 20B of the switching valve 15, and is guided to the switching device supply / discharge pipe 28 and the housing supply / discharge passage 52 of the cylinder housing 32. The hydraulic oil guided to the housing supply / discharge passage 52 passes through the bolt supply / discharge passage 50 of the support bolt 42, the hollow portion 43A of the guide rod 43, the hollow portion 48 of the piston rod 36, and the small passage 49, It is guided into the main down chamber 46. The hydraulic oil that has reached the main down chamber pushes the buffer piston 37 and the tilt piston 35 downward in the drawing to lower the piston rod 36, and the tilt piston 3
5 is brought into contact with the trim piston 34, and the outboard motor 1 is trimmed down.

At this time, the hydraulic oil in the up chamber 45 passes through the housing supply / discharge passage 51 and the switching device supply / discharge pipe 26 of the hydraulic oil switching device 12, and the up-side valve chamber 20 of the direction switching valve 15 is moved.
It reaches A and is guided to the hydraulic oil supply pump 13. During this time, the oil equivalent to the stroke volume of the piston rod 36 is opened by the down blow valve 30 and flows into the drain tank 14.

(4) Trim Down Operation As shown in FIGS. 2 (A) and 1 (A), the hydraulic oil supply pump 13 is further reversed to supply hydraulic oil to the housing supply / discharge passage 52 of the cylinder housing 32. By continuing the operation, the hydraulic oil that has reached the housing supply / discharge channel 52 is pressure-fed into the sub-down chamber 47 via the check valve 53. The hydraulic oil in the sub-down chamber 47 presses the trim piston 34 downward. Due to the action of these hydraulic oils, the trim piston 34, the tilt piston 35, and the buffer piston 37.
Simultaneously move downward to move the piston rod 36 in the same direction to trim down the outboard motor 1.

This trim down is performed by the trim piston 34.
Is terminated when the stopper contacts the stopper 41 of the cylinder housing 32. After the trim down is completed, even if the hydraulic oil supply pump 13 continues to supply the hydraulic oil, the hydraulic oil is discharged from the down blow valve 30.

(5) Impact Energy Absorption Operation If the outboard motor 1 collides with driftwood or an underwater obstacle while the outboard motor 1 is in motion, the piston rod 36 will shockly move.
It projects upward in (B). At this time, only the impact piston 37 moves upward, and the hydraulic oil in the main down chamber 46 flows into the oil chamber 57 via the buffer valve 55. The fluid resistance while the hydraulic oil flows through the buffer valve 55 absorbs the impact force.

The outboard motor 1, which has been shocked and swung, eventually descends due to its own weight, and pressure acts on the hydraulic oil in the oil chamber 57. Then, the return valve 56 of the impact piston 37 is opened, the working oil in the oil chamber 57 returns to the main down chamber 46, the piston rod 36 descends, and the outboard motor 1 also returns to the fixed position.

The effects will be described below. According to the above-described embodiment, since the trim up force acts on the cylinder 31 having the trim piston 34 together with the tilt piston 35, a large trim up force can be obtained without increasing the inner diameter of the cylinder 31, and the trim / tilt device can be downsized. Can be converted.

Further, it is not necessary to increase the diameter of the cylinder 31 either, the pressure receiving area of the tilt piston 35 does not need to be increased, and the tilt operation speed can be prevented from decreasing.

Further, since the diameter of the cylinder 31 can be prevented from being reduced as described above, the pressure receiving area of the buffer piston 37 can be secured, and the shock energy acting on the piston rod 36 by the buffer valve 55 can be well absorbed.

Further, the main down chamber 46 includes the small flow path 49 of the piston rod 36, the hollow portion 48, and the guide rod 4.
3 through the hollow portion 43A and the bolt supply / discharge channel 50 of the support bolt 42, and is communicated with the housing supply / discharge channel 52 of the cylinder housing 32. The supply / discharge channel 52 is connected to the switching device supply / discharge pipe 28 in the exposed state. Connected. Also, up room 45
Is also connected to the exposed switching device supply / discharge pipe 26 via the housing supply / discharge channel 52 formed in the cylinder housing 32. Therefore, these exposed pipes 26 and 28 can be shortened, and as a result, damage to these exposed pipes 26 and 28 can be reduced.

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific structure of the present invention is not limited to this embodiment, and changes in design within the scope not departing from the gist of the present invention can be made. Even if it exists, it is included in the present invention.

[0040]

As described above, according to the trim / tilt device for a marine vessel propulsion device according to the present invention, a large tilt-up force can be generated without impairing the shock absorbing property and the tilt operation speed even if the device is small. .

[Brief description of drawings]

FIG. 1 is a trim / outboard motor trim / tilt device to which an embodiment of a trim / tilt device for a marine propulsion device according to the present invention is applied.
Shows the tilt device, (A) shows the full trim down state,
FIG. 6B is a cross-sectional view showing a full tilt-up state.

2 shows the trim and tilt device of FIG. 1,
FIG. 4A is a cross-sectional view showing a trim-up state and FIG.

FIG. 3 is a side view showing an outboard motor provided with the trim / tilt device of FIGS. 1 and 2.

[Explanation of symbols]

 1 Outboard Motor 6 Hull 10 Trim / Tilt Device 11 Cylinder Device 12 Hydraulic Oil Switching Device 13 Hydraulic Oil Supply Pump 15 Directional Switching Valve 26, 28 Switching Device Supply / Discharge Pipe 31 Cylinder 32 Cylinder Housing 33 Cylinder Unit 34 Trim Piston 35 Tilt Piston 36 Piston Rod 37 Buffer Piston 38 Base End Connection 39 End Tip Connection 45 Up Chamber 46 Main Down Chamber 47 Sub Down Chamber 51, 52 Housing Supply / Discharge Flow Path 55 Buffer Valve

Claims (1)

[Claims] 1. A marine propulsion device in which a cylinder device is disposed between a hull and a marine propulsion device tiltably supported by the hull, and the marine propulsion device is trimmed and tilted by the cylinder device. In the above trimming and tilting device, in the cylinder device, a cylinder is slidably arranged in a cylinder housing, and the cylinder is fixed to a cylinder unit projecting from the cylinder housing and a base end portion of the cylinder. A trim piston slidably accommodated in the cylinder housing within a predetermined range, a tilt piston slidably accommodated in the cylinder so as to come into contact with the trim piston, and a slidable piston in the cylinder. A buffer piston that is movably accommodated, is fixed to the piston rod, and has a buffer valve installed, One of the cylinder housing and the piston rod is connected to the hull, and the other is connected to the marine vessel propulsion device, and further, an up-position within the cylinder unit defined by the tilt piston and the trim piston. A trim / tilt device for a marine propulsion device, characterized in that the chamber and the down chamber are selectively communicated with a working fluid supply pump by a working fluid switching device.