JPS6283298A - Hydraulic type tilt device for outboard propeller - Google Patents

Abstract

PURPOSE:To make automation for the pull-up operation of an outboard propeller and its successive rod's retracting operation performable as well as to aim at the facilitation of housing work, by making a selector valve so as to operate selection to its reverse connection by means of a detection signal out of a sensor detecting the operational terminal of a tilt cylinder. CONSTITUTION:To pull up an underwater outboard propeller 3 on the surface of the water, a pump 8 is rotated clockwise and oil is fed to an oil passage 12, but a selector valve 16 is connected to a sequent direction by a sensor 20 so that pressure oil is simultaneously fed to a tilt cylinder 6 and a trim cylinder 7, and since an upper chamber 7d of this trim cylinder is connected to a release valve 26, an unoperational state is maintained till the specified pressure works, whereby the whole quantity of feeding pressure oil out of the pump 8 is fed to the tilt cylinder 6, thus the pulling-up operation of the outboard propeller 3 is carried out so speedily. Next, when this propeller 3 is completely pulled up and reached to a stroke end, the selector valve 16 is automatically selected from the sequent direction to the reverse direction by the sensor 20, and oil is fed to the upper chamber 7d so that a piston 7c makes a rod 7b retract as removing a hydraulic fluid inside a lower chamber 7e.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to an outboard propulsion device such as a drive unit connected to an outboard motor or an inboard motor, and particularly relates to an outboard propulsion device such as a drive unit connected to an outboard motor or an inboard motor. Or it relates to the improvement of a hydraulic tilt device for lowering into water.

[Prior art and its problems] It is known that a hydraulic cylinder is used to raise and lower an outboard motor or an inboard motor between underwater and above water. Generally, in such a device, the lift switch TI4 provided on the grip of the speed control lever is selectively pressed to rotate the hydraulic bong forward or reverse, so the tilt cylinder and trim cylinder are connected parallel to each other. As a result, when the tilt cylinder is refueled to raise the outboard propulsion unit above water, the trim cylinder is also refueled, causing the piston rod to protrude outward. There is a problem with "Fujitsubo" and other aquatic creatures adhering to the water. Conventionally, in order to solve this problem, a technique is known in which the tilt cylinder is extended to lift the outboard propulsion unit into the water, and then pressure oil is supplied in the opposite direction to the trim cylinder to withdraw the rod ( For example, JP-A-60-1044
Publication No. 92).

However, in such a system, the trim rod is removed by reversing the hydraulic pump, which has the disadvantage of requiring a long time to operate.

[Objective of the Invention, Summary of the Structure of the Invention J The purpose of the invention is to automatically perform the above-mentioned lifting operation of the outboard propulsion device and the subsequent retracting operation of the rod, which had conventionally been performed manually. The cylinder and the trim cylinder are composed of a hydraulic cylinder, a piston loosely fitted in the hydraulic cylinder, and a piston rod protruding from the piston to the outside of the hydraulic cylinder. The lower chamber of the tilt cylinder is connected to a first oil passage, and the royal chamber and upper chamber of the trim cylinder are connected to a first oil passage branched from the first oil passage by a switching valve. It is connected to a branch oil passage and a return oil passage having a relief valve, and the switching valve is configured to be switched to reverse connection in response to a detection signal from a sensor that detects the end of operation of the tilt cylinder.

〔Example〕

Hereinafter, the present invention will be described with reference to the illustrated embodiment. In the figure, 1 is a hull, and a bracket 2 is fixed to the rear of the hull in a removable manner, and an outboard propulsion unit 3 equipped with a screw 3a't is attached to the bracket 2. The main shaft of the outboard motor is rotatably mounted on a shaft by a bin 4. That is, the upper part of the outboard propulsion device 3 and the bracket 2 are connected by the tilt cylinder 6, and the outboard propulsion device 3 is pulled up above the water by extension and lowered into the water by contraction.

The tilt cylinder 6 has a hydraulic cylinder 6a, a rod 6b on one side, and a piston 6c protruding from the hydraulic cylinder fitted in a slidable manner.The hydraulic cylinder 6a is connected to the outboard propulsion unit 3, and the rod rod b is connected to the bracket 2. Each is rotatably connected. The inside of the hydraulic cylinder 6a is divided by the piston 6c into an upper chamber 6d located on the rod 6b side and a lower chamber 6e on the back side thereof.

A trim cylinder 7 is fixedly mounted on the bracket 2, and is composed of a pair of hydraulic cylinders connected in parallel to each other. The configuration of the trim cylinder 7 is the same as that of the tilt cylinder 6 described above, and consists of a hydraulic cylinder 7a, a piston IC fitted thereto, a rod ab protruding from one side of the piston 7c, and an outer end of the rod 1b that is connected to the hydraulic cylinder 7a. It penetrates the outer end of the cylinder 7a, supports the front side of the outboard propulsion device 3 at its tip, and transmits the thrust of the screw 3a to the hull.
The angle at which the outboard motor main body 3 is attached to the hull 1 is adjusted. The inside of the hydraulic cylinder Ia is divided by the piston IC into an upper chamber 7d located on the rod 6b side and a lower chamber 7e on the back side thereof.

Reference numeral 8 denotes a rotary pump configured so that the discharge port and suction port can be alternated by changing the direction of rotation, and is driven by an electric motor in both forward and reverse directions. That is, when the pump 8 rotates normally, the first boat 8a becomes the discharge port and the second boat 8b becomes the suction port. When rotating in reverse, the second boat 8b becomes the discharge port and the first boat 8a becomes the suction port. 9 is this pump 8
8a and 8bK are connected, and the balance valve 9 is a cylinder 9a and a free piston 9 that plays with it.
b and check valves 9c, 9c that close both ends of the cylinder 9a.
and has. 8f, U The valve body of the check valve 9C is pushed away from the valve seat, and the check valve 9ci is a protrusion that is normally open. The pump 8 communicates with an upper chamber 9d and a lower chamber 9e defined by a free piston 9b.

10 is a hydraulic oil tank.

Next, oil passages connecting these hydraulic devices will be explained. The first port 8a of the pump 8 is connected to a first oil passage 12 that passes through the balance valve 9 and is connected to the lower chamber 6e of the tilt cylinder 6, and the second port 8bK is connected to the tilt cylinder 6.
A second oil passage 14 is connected to the upper chamber 6d.

The first oil passage 12 is branched in the middle and connected to the trim cylinder 7 via a first branch passage 13. That is, the upper chamber Td and lower chamber 7e of the trim cylinder 7 are connected to one boat of a switching valve 16 that switches the oil passage between forward and reverse directions, and the other boat of the switching valve 16 is connected to the first branch passage 13. and a return oil path 18 connected to the hydraulic oil tank 10. The switching valve 16 is a renoid valve, and when a detection signal is issued from the sensor 20 that detects the end of operation of the tilt cylinder 6 to detect that the outboard propulsion unit 3 has been lifted above the water, it switches between forward and reverse directions. It will be done.

Note that various aspects of the sensor 20 are considered. For example, the detection switch 20a that detects the main body 3 of the outboard motor that has been pulled up to the water can be used as a detection switch 20a that is attached to a beautiful metal rod (not shown) that is pivoted to the hull at the ninth point that locks the outboard propulsion engine 3 above the water. In addition, as a detection switch for detecting that the holder has been rotated to the operating position, it is also used as a detection switch in the second oil passage 14 to anchor the outboard propulsion unit 3 above the water, as shown by the imaginary line in the figure. Interposed lock valve 2
4 is closed, such as a detection switch 20b. Although these detection switches may be used independently or in combination, they are not directly related to this invention. 26, 34, and 36 are relief valves that open at a predetermined pressure, and are connected to the return oil passage 18 and the second oil passage 14, respectively.
It is provided in the first oil passage 12. 28, 30, and 32 are both check valves.

Return oil passage 18, first oil passage 12, and second oil passage 1, respectively.
4, and only allows flow of hydraulic oil from the tank 10 to the tilt cylinder 6 and trim cylinder 1 direction.

Next, the operation of this embodiment will be explained. First, to lower the outboard propulsion unit 3 moored on the water into the water and start sailing,
After death, remove the Bibumi '4s or open the lock valve 24.
When the pump 8 is reversed, the first oil passage 1 is connected from the second port 8b.
4, pressure oil is supplied to the lower chamber 9e of the balance valve 9, the free piston 9b moves upward, and the protrusion 9f permanently opens the upper reverse valve 9C. Therefore, the pressure oil is fed to the upper chamber 6d of the tilt cylinder 6 through the lower check valve 9ct, and moves the piston 6C in the direction of shortening the entire piston, while the lower chamber 6e
The hydraulic oil inside is removed, flows back through the first oil passage 12, and is sucked into the WJL 8a of the pump 8.

In addition, since the volume of the lower chamber 6e of the tilt cylinder 6 is larger than the volume of the upper chamber 6d, the amount of hydraulic oil discharged is excessive, and when the pump 8 cannot suck in the hydraulic oil, the relief valve 3
The hydraulic oil is returned to the tank 10 via 6 and 1. In this way, the outboard propulsion machine 3 is lowered into the water.

Next, we will explain the case of cruising in shallow water at a relatively low speed. In shallow water, the outboard propulsion unit 3 is tilted by the tilt cylinder 6 to an angle of about 30 degrees from the vertical plane, and this state is maintained during navigation. It is slightly higher to avoid buffering it with the bottom of the water.

The inclination angle of the outboard propulsion device 3 for shallow water cruising is set by rotating the pump 8 in the normal direction, supplying oil to the first oil passage 12, and extending the tilt cylinder 6 appropriately.

However, the thrust of the outboard propulsion unit 3 generated during cruising is transmitted to the hull via the tilt cylinder 6 and the pin 4. In order to return to normal cruising, the pump 8 is reversed, oil is supplied to the second oil passage 14, the tilt cylinder 6 is appropriately shortened, and the front portion of the outboard propulsion device 3 is brought into contact with the trim rod 1b. At this time, the trim angle is set depending on the advanced position of the trim rod 7b.

Generally, the trim angle is set during navigation.

That is, when the pump 8 is rotated forward and oil is supplied to the first oil passage 12 while cruising, the pressure oil acts on the tilt cylinder 6 and the trim cylinder 7 at the same time, but at this time, the outboard propulsion unit 6 receives large Since it is receiving thrust, tilt cylinder 6
operation is inhibited, only the two trim rods 7b protrude, and the outboard propulsion device 3 is rotated clockwise in the figure by an angle corresponding to the two trim rods 7b.

Finally, to raise the outboard propulsion device 3 that is underwater to the surface, the pump 8 is rotated in the normal direction to supply oil to the first oil passage 12, similarly to the adjustment of the trim angle. At this time, since the switching valve 16, which is a renoid valve, is connected in the forward direction by the sensor 20, the 5-pressure oil is supplied to the tilt cylinder 6 and the trim cylinder 7 at the same time, but the upper chamber γd of the trim cylinder I is released. Since it is connected to the valve 26, it remains inactive until a predetermined high pressure is applied, and the entire amount of pressure oil fed from the pump 8 is sent to the tilt cylinder 6. Therefore, the outboard propulsion device 3 is quickly raised above the water. When the outboard propulsion unit 3 is completely lifted above the water and reaches the end of its stroke, the switching valve 16 is automatically switched from the forward direction to the reverse direction by the operation of the sensor 20, and the trimming is performed via the first branch path 13. Since the upper chamber 1d of the cylinder I is supplied with oil, the piston 1c moves the rod 7b backward while removing the hydraulic oil in the lower chamber 1e. At this time, the outboard propulsion unit 3 has already reached the rising end, so the tilt cylinder 6
Since no pressure oil flows into the trim cylinder and the full pressure of the pump 8 acts on the trim cylinder, the release valve 26 opens and the above-described operation is performed.

Effects of the Invention As described above, in the present invention, the tilt cylinder and the trim cylinder are composed of a hydraulic cylinder, a piston loosely fitted in the hydraulic cylinder, and a piston rod protruding from the piston to the outside of the hydraulic cylinder, The inside of the hydraulic cylinder is divided into an upper chamber located on the rod side of the piston and a lower chamber on the back side thereof, the lower chamber of the tilt cylinder is connected to the first oil passage, and the lower chamber and the upper chamber of the trim cylinder are switched. A first branch oil passage branched from the first oil passage and a return oil passage having a relief valve are connected by a valve, and the switching valve is switched to reverse connection by a detection signal from a sensor that detects an end of operation of the tilt cylinder. Because it is configured to operate,
The action of lifting the outboard propulsion device 3 above the water is quickly performed. Furthermore, since the tilt rod 7b automatically moves away after the outboard propulsion device 3 is pulled up, there is an effect that the work of collapsing the outboard propulsion device 3 becomes easier.

[Brief explanation of drawings]

The drawing shows an actual example of the present invention, and is an operational diagram showing the outboard propulsion device at the stern. 3φ...Outboard propulsion unit, 6...Tilt cylinder, 1
...Trim cylinder, 8...Rotary pump. Patent applicant Yamaha Motor Co., Ltd. Showa Seisakusho Co., Ltd.

Claims (3)

[Claims] (1) The tilt cylinder and the trim cylinder are composed of a hydraulic cylinder, a piston that is loosely fitted in the hydraulic cylinder, and a piston rod that projects from the piston to the outside of the hydraulic cylinder, and the inside of the hydraulic cylinder is moved toward the rod side of the piston. The lower chamber of the tilt cylinder is connected to the first oil passage, and the lower chamber and the upper chamber of the trim cylinder are branched from the first oil passage by a switching valve. A ship connected to a first branch oil passage and a return oil passage having a relief valve, and configured to switch the switching valve to reverse connection in response to a detection signal from a sensor that detects the end of operation of a tilt cylinder. Hydraulic tilt device for external propulsion machine. (2) The sensor that detects the end of tilt cylinder operation is
The hydraulic tilt device for an outboard propulsion machine according to claim 1, which detects the operation of a locking means for locking the tilt cylinder above water. (3) The sensor that detects the end of tilt cylinder operation is
The hydraulic tilt device for an outboard propulsion machine according to claim 1, wherein the detection switch is a detection switch provided at the rotation end of the tilt cylinder on the water side.