JPS6145599B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power trim/tilt device for an outboard motor.

The outboard motor is swingably attached to the hull of the boat and is swung so as to have both a trim range and a tilt range by a hydraulic cylinder device installed between the two. This trim range is a range in which the cruising attitude can be changed by changing the thrust direction of the propeller while traveling at high speed, and it requires a large amount of force to rock the outboard motor against the thrust. . On the other hand, tilt range simply swings the outboard motor against its own weight, and when the outboard motor collides with a reef, the outboard motor swings even further beyond the trim range. This is the range where it acts as a shock absorber, and only a small amount of force is required.

Conventionally, this type of hydraulic cylinder device has two hydraulic cylinders: a trim hydraulic cylinder and a tilt hydraulic cylinder.
Trim hydraulic cylinders are often made up of sets, and require a large amount of force, so
An extremely large one used multiple small ones. Therefore, the conventional hydraulic cylinder device has the disadvantage that the entire hydraulic cylinder device becomes large.

The present invention solves the above-mentioned drawbacks, and aims to provide a device in which a single hydraulic cylinder is used for both trimming and tilting purposes, and in which the hydraulic cylinder can generate a large force even though it is small. . For this reason, the hydraulic cylinder device used in the present invention is provided with a plurality of trim pistons integrally connected in series within the cylinder in order to boost output, and a tilt piston is provided within the assembly of the trim pistons. Its basic feature is that it is equipped with a piston.

Embodiments of the present invention will be described below with reference to the drawings. In Figure 1, 1 is the hull, 2 is the outboard motor, and 3
is an outboard motor mounting fixture detachably fixed to the hull 1. The outboard motor 2 is pivoted to the mounting bracket 3 using a horizontal pin 4 so as to be able to swing clockwise and counterclockwise in the figure. A tilt range B in which the propulsion device 5 of the outboard motor 2 swings toward the water surface even more than the trim range A is possible. A hydraulic cylinder device 6 is installed between the hull 1 (in the embodiment, the attachment 3 fixed to the hull 1) and the outboard motor 2, and the outboard motor receives the driving force from the hydraulic cylinder device 6. 1 is oscillated so that both ranges A and B can be taken.

FIG. 2 shows a hydraulic cylinder device 6 and a control device (hydraulic circuit) for controlling the supply and discharge of hydraulic oil to the hydraulic cylinder device 6.
7 is shown. The hydraulic cylinder device 6 has an outer shell composed of a bottomed cylindrical cylinder 8 and a rod guide 9 that closes the open end thereof, and the inside of the cylinder 8 is divided into two chambers 11 and 12 by a partition 10. has been done. The partition wall 10 is integrally provided with a cylinder liner 10a extending toward the rod guide 9, and is fixed in a predetermined position by being pressed by the rod guide 9 and the cylinder 8 from the axial direction (left-right direction in FIG. 2). Trim pistons 13 and 14 are slidably inserted into each chamber 11 and 12,
The trim pistons 13 and 14 are connected to the partition wall 10.
A connecting sleeve 15 that slidably and liquid-tightly penetrates the
are integrally connected.

A tilt piston 16 is slidably fitted into the connecting sleeve 15, and a piston rod 17, which extends integrally with the tilt piston 16, is loosely fitted around the trim piston 13 and slidably passes through the rod guide 9. It extends outside the cylinder 8. The tilt piston 16 has two communication passages 18 and 19 that open to the extension side (rod guide 9 side) end surface and the contraction side end surface of the piston rod 17, respectively.
is formed in the communication passage 18, and a check valve 20 is provided in the communication passage 18 that allows flow only from the contraction side end face to the expansion side end face.
However, the communication path 19 is also provided with a check valve 21 that only allows flow in the opposite direction.

Each of the chambers 11 and 12 is divided into two independent small chambers 1 by a trim piston 13 or 14.
1a, 11b, 12a, 12b, and each chamber 11a, 11b, 12a, 12
b is a hydraulic oil supply/discharge port 2 formed in the cylinder 8.
2, 23, 24, and 25 are open. The small chamber 11a located on the most extended side is a through hole 13a of the trim piston 13 into which the rod guide 9 is loosely fitted.
It communicates with the inside of the connecting sleeve 15 through the small chamber 11a, so that the pressure inside the small chamber 11a acts on the extension side end surface of the tilt piston 16. In addition, the trim piston 14 has a small chamber 1 located on the most contraction side.
A small-diameter communication port 14a is formed so that the pressure inside 2b acts on the contraction side end surface of the tilt piston 16, and the tilt piston 16 can be seated and taken off from the periphery of the opening end of the communication port 14a on the tilt piston 16 side. A gasket 26 is inserted.

To explain the hydraulic oil supply/discharge control device 7, 27 is a storage tank, 28 is a reversible pump (a pump whose suction port acts as a discharge port and the discharge port acts as a suction port depending on the rotation direction), 29 is a motor that drives the pump 28, and 30 is a 6-port, 3-position spool valve. The spool valve 30 has two valve bodies 31 and 32 that move together integrally, and is normally held in the illustrated position by the balance of two springs 33 and 34. One valve body 31 acts on the ports 35, 36, 37, and the other valve body 31 acts on the ports 35, 36, 37.
2 is adapted to act on ports 38, 39, and 40.

One side connection port 28 a as an inlet or outlet of the pump 28 is connected to the oil storage tank 27 via check valves 42 and 43 using a branch pipe 41 , and is connected to one set of the spool valve 30 . is connected to two ports 35, 36 of each element 28a, 4.
2, 43, 35, and 36 are in direct communication with each other only via piping 41. Also, the pump 28
The other side connection port 28b is connected to the oil storage tank 27 via the check valves 45 and 46 using the branch pipe 44, and is also connected to the two ports 38 and 39 of the other set of the spool valve 30. and each element 28
b, 45, 46, 38, and 39 are in direct communication with each other only via piping 44.

Of the remaining ports 37 and 40 of the spool valve 30, the port 37 on one group side is connected to the supply/discharge ports 22 and 24 via a branch pipe 47, and the port 40 on the other group side is connected to the branch pipe 47. Via tube 48,
It is connected to the supply/discharge ports 23 and 25. Both branch pipes 47 and 48 are connected via a manually operated release valve 49. Further, the branch pipe 47 and the oil storage tank 27 are connected via a bypass pipe 50 that bypasses the spool valve 30 and a check valve 51. In the power supply circuit of the motor 29, the inside of the branch pipe 47, that is, the small chambers 11a, 1
A pressure switch 52 that is activated when the pressure exceeds a predetermined pressure is connected to the inside of the motor 2a, and when the pressure switch 52 is activated, the motor 29 is energized even if the main changeover switch (not shown) of the motor 29 is OFF. It is designed to be reversed as described below. In addition, in the figure, 53 and 54 are filters, and 55 is a pump drive shaft.

The hydraulic cylinder device 6 as described above is used with the cylinder 8 being pivotally connected to either the hull 1 or the outboard motor 2, and the piston rod 17 being pivotally connected to the other of the two. In the embodiment, the hull 1
By attaching the cylinder 8 to the fixture 3 fixed to the
It is detachable from the hull 1. The mounting fixture 3 is provided with a plurality of connecting holes 56 for pivotally mounting the cylinders 8, so that the rocking angle of the outboard motor 1 can be adjusted to a desired angle when the hydraulic cylinder device 6 is in the minimum state. It is now possible to set it to Of course, this swing angle adjustment is performed with the on-off valve 49 open to communicate the small chambers 11a, 11b, 12a, and 12b, and after this adjustment, the on-off valve 49 is kept closed.

Next, the operation of the above-mentioned component device will be explained. A main changeover switch (not shown) rotates the motor 29 in the forward direction to drive the pump 28, with the connection port 28a of the pump 28 serving as a suction port and the connection port 28b serving as a discharge port. The hydraulic oil in the oil storage tank 27 flows as pressure oil from the connection port 28b of the pump 28 to the port 39 of the spool valve 30, and the valve bodies 31 and 32 move to the left in the figure to connect the ports 38 and 40 and the port 39. 36 and 37 are communicated.

The pressure oil exiting the port 40 passes through the branch pipe 48 and the supply/discharge ports 23 and 25 to the small chamber 1 of the hydraulic cylinder device 6.
1b, 12b. On the other hand, small room 11
a, 12a are supply/discharge ports 22, 24, branch pipe 47,
Ports 37, 36 of spool valve 30, branch pipe 41
via the suction port (connection port 28a) of the pump 28
communicated with the side. Therefore, trim piston 1
3 and 14 move in the extension direction, the tilt piston 16 moves integrally with both trim pistons 13 and 14 while seated on the trim piston 14 (the tilt piston 16 moves due to the thrust from the outboard motor 2).
A pressing force is applied to the shrinking side, and the packing 26
(The pressure-receiving area of the contraction side end surface of the tilt piston 16 becomes smaller due to the effect of
Swing clockwise in the figure.

When the trim piston 13 or 14 reaches the extension stroke end, only the tilt piston 16 slides inside the connecting sleeve 15, and the piston rod 17 is further extended from the inside of the cylinder 8. As a result, the outboard motor 2 It is swung beyond trim range A to tilt range B.

When the motor 29 is reversed, the pump 28 uses its connection port 28b as the suction port and the connection port 28b as the suction port.
a is driven as a discharge port, and the valve bodies 31 and 32 of the spool valve 30 move rightward in FIG. Therefore,
In this case, contrary to the above, the piston rod 17 is retracted into the cylinder 8, and the outboard motor 2 is swung clockwise in FIG.

In this way, the trim range A is determined according to the stroke of the trim piston 13 or 14,
Further, the tilt range B is determined according to the stroke of the tilt piston 16 with respect to the trim pistons 13 and 14.

When the outboard motor 2 collides with a reef while sailing, a moment acts on the outboard motor 2 in the clockwise direction in FIG. An external force acts on the connecting sleeve 15 to cause it to slide toward the extension side, but at this time, the hydraulic oil in the small chamber 11a flows into the small chamber 12b via the check valve 21, and this hydraulic oil flows through the check valve 21. Due to the resistance force when passing through
Buffers the above external force. To be more specific, each small room 1
1a, 11b, 12a, and 12b are in communication with each other through the open check valve 21 as a damping force generating mechanism, and the above-mentioned buffering is performed. In addition, when the impact at the time of a collision is so large that it cannot be cushioned by the check valve 21 alone, the check valve 51 opens and reduces the pressure in the small chambers 11a and 12a to the oil storage tank 2.
Release to 7.

Here, at the moment of collision, branch pipe 47 (small chamber 1
Since the pressures 1a and 12a) temporarily become high, the pressure switch 52 is activated and the motor 29 is rotated in the reverse direction. As a result, as is clear from the explanation up to now, the outboard motor 2, which had temporarily swung clockwise in Figure 1 compared to normal cruising, returns to its normal cruising position. The motor 29 is also stopped, and the cruise continues. In addition,
At the time of return, the check valve 20 is opened to provide a buffering effect, so that the return operation is performed relatively slowly.

In the above embodiment, the case where two trim pistons are provided has been described, but it goes without saying that three or more trim pistons may be provided. Further, other hydraulic circuits can be used as the hydraulic oil supply/discharge control device.

As is clear from the above description, the present invention has the following features:
One hydraulic cylinder can be used for both trim and tilt purposes. In addition, multiple trim pistons are arranged in series to dramatically increase the total pressure-receiving area, so the output is boosted and the outboard motor can rock with plenty of room during trimming. can. Furthermore, since only one hydraulic cylinder is required and the tilt piston is installed within the trim piston assembly, it is possible to reduce the size of the tilt piston.

[Brief explanation of the drawing]

FIG. 1 is a side view showing how the outboard motor is attached to the hull, and FIG. 2 is a system diagram of the device of the present invention showing a hydraulic cylinder device in section. DESCRIPTION OF SYMBOLS 1... Hull, 2... Outboard motor, 6... Hydraulic cylinder device, 7... Hydraulic oil supply and discharge control device, 8... Cylinder, 10... Bulkhead, 11, 12... Chamber, 11
a, 11b, 12a, 12b...small room, 13,1
4...Trim piston, 15...Connection sleeve,
16...Tilt piston, 17...Piston rod, 22, 23, 24, 25...Hydraulic oil supply/discharge port.

Claims (1)

[Claims] 1. A hydraulic cylinder device installed between a hull and an outboard motor swingably attached to the hull, and a hydraulic oil supply/discharge control device for the hydraulic cylinder device, A hydraulic cylinder device has multiple chambers defined in series inside by partition walls,
a cylinder connected to one of the hull or the outboard motor; and a plurality of trim pistons that are slidably inserted into each of the chambers and integrally connected to each other by connection sleeves that slidably penetrate the partition wall. , a tilt piston slidably inserted into the connecting sleeve; and one end that is slidable relative to the cylinder and extends into the cylinder is integrated with the tilt piston, and is connected to the outside of the cylinder. a piston rod, the other end of which extends to the other end of the piston rod, which is connected to the other side of the hull or the outboard motor; a plurality of hydraulic oil supply and discharge ports connected to a supply and discharge control device; the tilt piston is integrally displaced with the trim piston only in the trim range, and in the tilt range, the tilt piston is displaced relative to the trim piston in the tilt range; A power trim/tilt device for an outboard motor, characterized in that it is configured to be displaced.