JP3329403B2 - Hydraulic power tilt / trim device for marine propulsion - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic power tilt / trim device for swinging a propulsion device mounted on a small or medium-sized ship independently in a trim region and a tilt region. The present invention relates to a structure capable of preventing a trim cylinder from performing a trim operation in a tilt operation area.

[0002]

2. Description of the Related Art A hydraulic power tilt / trim device is for independently swinging a propulsion device mounted on a stern of a hull in a trim region and a tilt region.
The trim operation is performed when the thrust angle of the propulsion unit is changed during cruising to control the cruising attitude. The tilt operation is performed when the hull is stopped or when the propulsion unit collides with a reef. This is done when raising the machine above the water surface.

[0003] As an example of such a hydraulic power tilt / trim device, there is a conventional hydraulic power tilt / trim device having a double cylinder structure in which a trim cylinder is coaxially disposed in a tilt cylinder (for example, Japanese Patent Publication No. 61-45599, Japanese Patent Application No. 3-
214807). As shown in FIG. 6, this double-cylinder type device has a trim cylinder 52 slidably inserted into a tilt cylinder 51 connected to a hull (not shown), and a tilt piston 53 is inserted into the trim cylinder 52. Is slidably inserted, the rod 54 of the piston 53 is projected outward through the cylinders 51 and 52, and the projected portion is connected to an outboard motor (not shown). It is.

When performing a trim operation in the tilt / trim device 50, the hydraulic pressure 58b or 58a is supplied to the lower chamber 57b or the upper chamber 57a of the tilt cylinder 51 with the tilt piston 53 contracted to the lower end (FIG. 1). 6
(A)). In this case, the switching valve 55 of the trim cylinder 52 is closed. As a result, the trim cylinder 52 rises (expands and contracts) integrally with the tilt piston 53,
Or, it descends (shrinks) (see FIGS. 6B and 6C).

When performing a tilt operation, the switching valve 55 is opened by extending the trim cylinder 52 to the rising end, and in this state, the lower chamber 57b of the tilt cylinder 51 is opened.
Alternatively, the hydraulic pressure 58b or 58a is supplied to the upper chamber 57a (see FIG. 6C). Then, since the tilt piston 53 can move relative to the trim cylinder 52, the tilt piston 53 moves up or down alone (FIG. 6).
(See (d) and (e)).

[0006]

However, in the above-described conventional hydraulic power tilt / trim device 50, the trim cylinder 52 may be lowered in the tilt operation region. When the trim cylinder 52 is lowered, the switching valve 55 is closed, and as a result, the operation order of trim and tilt is reversed.

That is, since the volume of the lower chamber 57b of the tilt cylinder 51 is set larger than that of the upper chamber 57a,
An oil amount adjusting valve is interposed in the hydraulic circuit, and a pressure up to the valve pressure is applied to the upper chamber 57a.

On the other hand, in the normal state, since the downward pressure is always applied to the tilt piston 53 by the weight of the outboard motor, the hydraulic pressure in the lower chamber 57b is set higher than the hydraulic pressure in the upper chamber 57a. ing. However, depending on the posture of the outboard motor at the time of tilt-up or the like, the pressure in the lower chamber 57b may decrease, and in consideration of the above-described pressure difference, the pressure in the upper chamber 57a may increase from the lower chamber 57b side. .

As a result, a force for pressing the trim cylinder 52 in the downward direction acts, and this pressing force becomes larger than the friction of the O-ring of the trim cylinder 52. Therefore, the trim cylinder 52 may move downward even in the tilt region.

Further, when the tilt / trim device is operated during reverse cruising, when the lower case of the outboard motor is removed for maintenance, or when the tilt / trim device is assembled at a factory or the like, the tilt / trim device is used alone. In the case where the tilt piston is operated, a tensile load may be applied to the tilt piston, and also in this case, there is a problem that the same operation order is reversed.

The present invention has been made in view of the above-mentioned conventional circumstances, and provides a hydraulic power tilt / trim device for a marine propulsion device capable of reliably preventing a trim cylinder from performing a trim operation in a tilt operation region. It is intended to be.

[0012]

According to the present invention, a trim cylinder is slidably inserted into a tilt cylinder connected to one of a hull and a propulsion device, and a tilt piston is slidably inserted into the trim cylinder. Movably inserted, a rod of the tilt piston is projected outward through the trim cylinder and the tilt cylinder, and a projecting end of the rod is connected to the other side of the hull or the propulsion device, In the trim operation of the propulsion device, the trim cylinder is moved integrally with the tilt piston located at the rod protruding end, and in the tilt operation, only the tilt piston is moved with the trim cylinder positioned at the rod protruding end. In the hydraulic power tilt / trim device for a marine propulsion device to be moved, the trim cylinder is moved to the rod projecting side end at the time of the tilt operation. It is characterized in that a locking means for locking the near position.

[0013]

According to the hydraulic power tilt / trim device of the present invention, the trim cylinder is locked at a position near the rod projecting side end of the cylinder, that is, at the trim operation end position or the tilt operation start position. Since the movement is restricted, the trim cylinder does not fall even if a force for contracting the trim cylinder acts on the trim cylinder due to its own weight or the like as described above. As a result, the downward movement of the trim cylinder in the tilt region can be reliably prevented, and the reliability of the operation function can be improved.

Further, since the operation order can be prevented from being reversed by providing the trim cylinder locking means, the operation function of the tilt / trim device can be sufficiently improved when performing reverse voyage or performing maintenance by removing the lower case or the like. It is possible to improve serviceability in the market. Further, since the tilt / trim device alone can be operated, assembly at a factory can be facilitated and workability can be improved.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to 5 are views for explaining a hydraulic power tilt / trim device of a marine propulsion device according to an embodiment of the present invention. FIG. 1 is a cross-sectional view of a hydraulic cylinder device constituting the hydraulic power tilt / trim device. FIG. 2, FIG. 2 is an enlarged view of a main part, FIG. 3 is a front view of the device, FIG. 4 is a side view showing an outboard motor employing the device, and FIG. 5 shows tilt and trim operations of the hydraulic cylinder device. It is a schematic diagram.

In FIG. 4, reference numeral 1 denotes a hull on which the apparatus of this embodiment is mounted, and an outboard motor (propulsion device) 2 is disposed at the stern 1a of the hull 1. The outboard motor 2 includes a screw 3
The upper case 4b is provided above the lower case 4a in which
And an engine 5 is mounted on the upper part of the upper case 4b, and the screw 3 is driven to rotate by the engine 5.

A clamp bracket 6 is fixed to the stern 1a, and a swivel arm 7 is attached to the bracket 6.
The upper edge portion 7a is pivotally supported by a tilt shaft 8, whereby the swivel arm 7 is rotatable about the tilt shaft 8. The outboard motor 2 is fixed to the swivel arm 7, and the hydraulic power tilt / trim device 10 of the present embodiment is interposed between the clamp bracket 6 and the swivel arm 7.

As shown in FIG. 3, the tilt / trim device 10 has a hydraulic cylinder device 11 and a hydraulic control device 12 arranged in parallel and integrated with each other, and has one operation button (not shown). By pressing, the driving operation can be performed. The hydraulic control device 12 has a schematic structure in which a hydraulic pump 12b is connected to a lower portion of a motor 12a, and an oil tank 12c is connected to a lower portion of the pump 12b.

In the hydraulic cylinder device 11, a piston rod 21 is inserted into a tilt cylinder 13 to be described later so as to be movable forward and backward.
3 a is connected to the clamp bracket 6, and the upper end 21 a of the piston rod 21 is connected to the swivel arm 7. Thus, the outboard motor 2 swings up and down with the extension and contraction of the piston rod 21.

The hydraulic cylinder device 11 is shown in FIGS.
As shown in FIG. 1, a cylindrical trim cylinder 14 is inserted into a bottomed cylindrical tilt cylinder 13 so as to be slidable in the axial direction. The trim cylinder 14 allows the tilt cylinder 13 to have an upper chamber 15a and a lower chamber 15a. And a chamber 15b. Further, lid members 16 and 17 for closing the openings are fitted and fixed to the upper end opening of the tilt cylinder 13 and the upper end opening of the trim cylinder 14, respectively.

A free piston 18 is slidably inserted in the trim cylinder 14 in the axial direction. The free piston 18 is moved downward by a stopper ring 19 fitted on a lower opening edge of the trim cylinder 14. Movement is regulated.

A tilt piston 20 is slidably inserted in the trim cylinder 14 above the free piston 18 in the axial direction. The inner end of a piston rod 21 is fastened and fixed to the tilt piston 20 by bolts 22. The outer end of the rod 21 is connected to the lid members 16 of the trim cylinder 14 and the tilt cylinder 13,
17 and project outward.

The tilt piston 20 has passages 23a and 23b communicating the lower chamber 15b and the interior of the trim cylinder 14.
Are formed, and check valves 24 and 25 are disposed in the passages 23a and 23b, respectively.

The cover member 1 of the trim cylinder 14
7 is formed with a passage 26 for communicating the inside of the cylinder 14 with the upper chamber 15a.
7 are interposed. The switching valve 27 closes the passage 26 during a trim operation described later, and opens during a tilt operation.

A liner 30 is fitted on the outer peripheral surface of the upper end of the trim cylinder 14, and the liner 30 is in sliding contact with the inner peripheral surface of the upper chamber 15a of the tilt cylinder 13. The two cylinders 1 are provided on the inner and outer peripheral surfaces of the liner 30.
O-rings 31, 31 for sealing between 3, 14 are inserted.

In a portion facing the hydraulic pump 12b at a substantially central portion in the axial direction of the tilt cylinder 13, two connection ports (not shown) for hydraulic oil are formed, and each connection port is connected to the pump 12b. The mouth is connected directly, that is, without passing through another passage. The one connection port is communicated with the inside of the upper chamber 15a through a hydraulic passage (not shown) formed in the tilt cylinder 13, and the other connection port is provided between the tilt cylinder 13 and the trim cylinder 14. It communicates with the lower chamber 15b through the formed hydraulic passage.

At the lower end of the trim cylinder 14, there is provided a lock means 33 which is a feature of the present embodiment. The lock means 33 has the following configuration.
Lock holes 34, 34 are formed in the lower end of the trim cylinder 14.
Are formed to penetrate in the radial direction, and a lock ball 35 is inserted into each lock hole 34 so as to be able to advance and retreat.

At the lower end of the trim cylinder 14, an annular pressing plate 36 is inserted and arranged. The pressing plate 36 is pulled down by a stopper ring 37 fitted on the lower opening edge of the trim cylinder 14. Has been prevented. The lock ball 35 is engaged with the outer edge of the pressing plate 36, and the free piston 18 is inserted into the inner edge. Further, a spring 38 is provided on the pressing plate 36, and the spring 38 urges the pressing plate 36 upward.

An engagement groove 40 is formed in the inner peripheral surface of the tilt cylinder 13. The engagement groove 40 is formed at a position where the lock ball 35 can be retracted when the trim cylinder 14 reaches the vicinity of the extension end.

Next, the operation and effect of this embodiment will be described. The hydraulic power tilt / trim device 10 of the present embodiment controls the swing angle of the outboard motor 2 in the trim area A and the tilt area B.

In the state where the outboard motor 2 is located at the lowermost end, when the operation button is pressed to perform the trim operation, the hydraulic pump 12b is driven by the motor 12a, and the hydraulic oil is supplied into the lower chamber 15b. You. At this time, since the switching valve 27 of the trim cylinder 14 is closed, the trim cylinder 14 extends integrally with the tilt piston 20, and the outboard motor 2 swings with this extension, and the trim angle is adjusted. Done. (See FIGS. 5A to 5C). It should be noted that even if the operation button is kept pressed while the trim cylinder 14 is located at the extended end in FIG.
Does not shift from the trim area A to the tilt area B because the thrust of the propulsion device 3 is larger than the force acting on the tilt area B.

To perform the tilt operation, if the operation button is kept pressed while the propulsion unit 3 is stopped or in the low-speed operation state, the trim cylinder 14 reaches the extension end and the switching valve 27 is opened (see FIG. 4C). ). Then, the free piston 18 and the tilt piston 20 can move relative to the trim cylinder 14, so that the two pistons 1
Only the extension 8, 20 further extends, and with this extension, the outboard motor 2 rises above the water surface (FIGS. 4 (d), 4 (e)).
reference).

When the free piston 18 is raised during the tilt operation, the pressing plate 36 is moved upward by the urging force of the spring 38. Then, the pressing plate 38 moves the lock ball 35 to the tilt cylinder 13.
(See FIG. 4D). This locks the trim cylinder 14 at the extended end position.

On the other hand, when the free piston 18 pushes down the pressing plate 36 with the downward movement of the tilt piston 20, the lock ball 35 moves from the engagement groove 40 to the inside of the cylinder, whereby the lock is released (FIG. 9). 4
(C)).

As described above, according to the present embodiment, the lock ball 35 is provided in the trim cylinder 14 so as to be able to advance and retreat, and the groove 40 in which the lock ball 35 is engaged is formed in the tilt cylinder 13 so that the tilt cylinder 13 can be used during the tilt operation. Press plate 3
6, the lock ball 35 is fitted into the engagement groove 40 to restrict the movement of the trim cylinder 14. Therefore, when the outboard motor 2 is tilted up on the water surface, the trim cylinder 1
4 does not move down to cause a trim operation, and a malfunction can be reliably prevented. As a result, the problem that the operation order is reversed can be avoided, and the reliability of the operation function can be improved.

Further, the provision of the locking means 33 can prevent a malfunction of the trim cylinder even during reverse cruising, and furthermore, the lower case 4a or the like can be removed to sufficiently operate the tilt / trim device 10 for maintenance. The serviceability in the market can be improved. Furthermore, the assemblability when assembling the tilt / trim device 10 can be improved.

In the above embodiment, the case where the lock ball is fitted into the engagement groove by the pressing plate and locked is described as an example. However, the lock means of the present invention is not limited to this. Locking means may be employed.

Further, in the above embodiment, the case where the lock mechanism is operated at the start of the tilt operation is taken as an example. However, the present invention is designed to operate the lock mechanism when the trim cylinder starts to descend in the tilt operation area. May be configured.

[0039]

As described above, according to the hydraulic power tilt / trim device for a marine propulsion device according to the present invention, the trim cylinder is locked at a position near the rod protruding side end during the tilt operation. Therefore, it is possible to reliably prevent the trim operation from being performed even if any load is applied to the trim cylinder, thereby improving the reliability of the operation function.

[Brief description of the drawings]

FIG. 1 is a sectional view of a hydraulic cylinder device constituting a hydraulic power tilt / trim device according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the hydraulic cylinder device.

FIG. 3 is a front view showing an assembled state of the hydraulic cylinder device and the hydraulic supply device of the embodiment device.

FIG. 4 is a side view showing an outboard motor to which the apparatus of the embodiment is applied.

FIG. 5 is a schematic view showing a tilt / trim operation of the apparatus of the embodiment.

FIG. 6 is a schematic diagram showing a tilt / trim operation by a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hull 3 Propulsion device 10 Hydraulic power tilt / trim device 13 Tilt cylinder 14 Trim cylinder 20 Tilt piston 21 Piston rod 33 Lock means A Trim area B Tilt area

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-6-64588 (JP, A) JP-A-4-126694 (JP, A) JP-B-61-45599 (JP, B1) (58) Field (Int.Cl. ⁷ , DB name) B63H 20/08

Claims (1)

(57) [Claims] 1. A trim cylinder is slidably inserted into a tilt cylinder connected to one of a hull and a propulsion device, and a tilt piston is slidably inserted into the trim cylinder. A rod of a tilt piston is protruded outward through the trim cylinder and the tilt cylinder, and the protruding end is connected to the other side of the hull or the propulsion device. Of the marine propulsion device in which the tilt piston is moved integrally with the tilt piston located at the rod protruding end, and only the tilt piston is moved with the trim cylinder positioned at the rod protruding end in the tilt operation. In the hydraulic power tilt / trim device, lock means for locking the trim cylinder to a position near the rod protruding side end during the tilt operation is provided. A hydraulic power tilt / trim device for a marine propulsion device.