JPH078675B2 - Hydraulic tilt device for outboard propulsion - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an outboard propulsion device such as a drive unit connected to an outboard motor or an outboard motor, and in particular, pulling the outboard propulsion device from underwater to above water. Alternatively, the present invention relates to an improvement of a hydraulic tilt device for lowering the water.

[Conventional technology and its problems]

It is known to use hydraulic cylinders for raising and lowering outboard motors and inboard motors in and out of water. Generally, in such a device, the lifting switch provided on the grip of the speed control lever is selectively pressed to normally or reversely rotate the hydraulic pump, so that the tilt cylinder and the trim cylinder are connected in parallel, As a result, when the tilt cylinder is refueled to raise the outboard propulsion device above the water, the trim cylinder is also refueled, and the piston rod projects outwards. There is a problem that other aquatic organisms attach. Conventionally, in order to solve such a problem, there is known a technique in which a tilt cylinder is extended to pull up an outboard propulsion device into water, and then pressure oil in a reverse direction is supplied to a trim cylinder to withdraw a rod ( For example, JP-A-60-104492).

However, in such a device, since the trim rod is retreated by reversing the hydraulic pump, there is a problem that it takes a long time to operate.

[Object of Invention, Outline of Structure of Invention]

The purpose of this invention is to automatically perform the pulling-up operation of the above-mentioned outboard propulsion unit and the subsequent rod leaving operation which have been manually performed, and the outboard propulsion unit provided at the stern is put underwater. A hydraulic tilt cylinder mechanism that tilts between a lowered position and a raised position above the water, a hydraulic trim cylinder mechanism that adjusts the tilt angle with respect to the hull when the outboard propulsion device is lowered into the water, and the rotation direction of the pump. And a return oil passage for switching the operation oil by switching the oil supply chamber and the return oil passage, and both oil chambers defined by pistons in the hydraulic cylinder of the tilt cylinder mechanism One of the two oil chambers, which is connected to the discharge oil passage and the return oil passage of the oil supply device, and which has the outboard propulsion device pulled up by supplying the working oil, is turned on. Of the two oil chambers defined by the piston in the hydraulic cylinder for the trim cylinder mechanism to supply the hydraulic oil to the oil chamber in which the outboard propulsion machine leans toward the pull-up side through the oil passage. The trim cylinder mechanism hydraulic cylinder has the other oil chamber communicated with the hydraulic oil tank via an oil passage having a relief valve in which the flow direction of the hydraulic oil is directed toward the hydraulic oil tank. When the detection signal of the sensor for detecting that the outboard propulsion machine is pulled up to the water is not input to the two oil passages that are communicated with the hydraulic cylinder for the cylinder mechanism, the communication destinations of these oil passages are as described above. age,
When the detection signal of the sensor is input, hydraulic oil is supplied so that the oil chamber in which the outboard propulsion machine leans toward the pulling up side communicates with the oil passage leading to the hydraulic oil tank and the other oil chamber tilts. A four-port switching valve that communicates with an oil passage leading to a hydraulic cylinder for a cylinder mechanism is provided.

〔Example〕

Hereinafter, the present invention will be described with reference to the illustrated embodiment. In the drawing, reference numeral 1 is a hull, and a bracket 2 is fixed to the rear portion of the hull so that the bracket 2 can be disassembled. The main body of the outboard motor is rotatably supported by a pin 4. That is, the upper portion of the outboard propulsion device 3 and the bracket 2 are connected by the tilt cylinder 6, and the extension thereof raises the outboard propulsion device 3 above the water, and the contraction causes it to descend into the water. .

The tilt cylinder 6 is slidably fitted with a hydraulic cylinder 6a and a piston 6c having a rod 6b projecting to one side in the hydraulic cylinder. The hydraulic cylinder 6a is connected to the outboard propulsion unit 3 and the rod 6b is connected to the bracket 2. Are rotatably connected to each other. The inside of the hydraulic cylinder 6a is partitioned by a piston 6c into an upper chamber 6d located on the rod 6b side and a lower chamber 6e on the rear surface thereof.

Reference numeral 7 is a trim cylinder fixedly mounted on the bracket 2, and is composed of a pair of two hydraulic cylinders connected in parallel with each other. The structure of the trim cylinder 7 is not different from that of the tilt cylinder 6, and the hydraulic cylinder 7a, the piston 7c fitted to the hydraulic cylinder 7a, and the rod protruding from one side of the piston 7c.
7b, the outer end of the rod 7b penetrates the outer end of the hydraulic cylinder 7a, the front end of which supports the front side of the outboard propulsion unit 3 to transmit the thrust of the screw 3a to the hull and to This is to adjust the mounting angle of the main body 3 of the machine. The inside of the hydraulic cylinder 7a is partitioned by a piston 7c into an upper chamber 7d located on the rod 7b side and a lower chamber 7e on the rear surface thereof.

Reference numeral 8 is a rotary pump configured such that the discharge port and the suction port are changed by changing the rotation direction, and is driven in the forward and reverse directions by an electric motor. That is, when the pump 8 rotates in the normal direction, the first port 8a becomes the discharge port and the second port 8b becomes the suction port. When reversing, the second port 8b becomes the discharge port and the first
Port 8a serves as an inlet. 9 are both ports of this pump 8
8a, 8b is a balance valve connected to the balance valve 9 is a cylinder 9
a and free piston 9b and cylinder 9a that play with it
And check valves 9c and 9c for closing both ends of the. 9f is a check valve 9c
Is a protrusion that pushes the valve body of the above from the valve seat and normally opens the check valve 9c. The pump 8 communicates with an upper chamber 9d and a lower chamber 9e which are partitioned by a free piston 9b. 10 is a hydraulic oil tank.

Next, an oil passage connecting these hydraulic devices will be described. A first oil passage 12 connected to the lower chamber 6e of the tilt cylinder 6 through a balance valve 9 is connected to the first port 8a of the pump 8, and the upper chamber 6d of the chilled cylinder 6 is similarly connected to the second port 8b.
The second oil passage 14 connected to the is connected.

The first oil passage 12 is branched on the way, and is connected to the trim cylinder 7 via the first branch passage 13. That is, the upper chamber 7d and the lower chamber 7e of the trim cylinder 7 are connected to one port of the switching valve 16 that switches the oil passage between the forward and reverse directions, and the other port of the switching valve 16 is connected to the first branch passage 13 as described above. It is connected to a return oil passage 18 connected to the hydraulic oil tank 10. The switching valve 16 is a solenoid valve, and when a detection signal for detecting that the outboard propulsion device 3 has been pulled up above the water is issued from the sensor 20 for detecting the operation end of the tilt cylinder 6, the forward / reverse direction is thereby changed. Can be switched.

Various aspects of the sensor 20 are considered. For example, as a detection switch 20a that senses the main body 3 of the outboard motor pulled up above the water in the price contact, a supporting rod pivotally supported on the hull for locking the outboard propulsion device 3 above the water (illustration shown). Is a detection switch that detects that it has been rotated to the operating position.
Further, as shown by a phantom line in the drawing, there is a detection switch 20b or the like for detecting that the lock valve 24 interposed in the second oil passage 14 for locking the outboard propulsion device 3 on the water is closed. . These detection switches may be independently used or used in combination, but they have no direct relation to the present invention. Reference numerals 26, 34, and 36 are relief valves that open at a predetermined pressure, and are provided in the return oil passage 18, the second oil passage 14, and the first oil passage 12, respectively. Reference numerals 28, 30, 32 are all check valves, which are provided in the return oil passage 18, the first oil passage 12 and the second oil passage 14, respectively, from the tank 10 of hydraulic oil toward the tilt cylinder 6 and the trim cylinder 7. Only flow is allowed.

Next, the operation of this embodiment will be described. First, in order to lower the outboard propulsion unit 3 locked on the water into the water and start sailing,
When the pump 8 is rotated in the reverse direction after the support rod is removed or the lock valve 24 is opened, the pressure oil is fed from the second port 8b to the lower chamber 9e of the balance valve 9 through the first oil passage 14 to free piston. 9b moves to the upper side, and the protrusion 9f normally opens the upper check valve 9c. Therefore, the pressure oil passes through the lower check valve 9c, and then the tilt cylinder 6
Is fed to the upper chamber 6d and moves the piston 6c in a direction to shorten the whole, while the hydraulic oil in the lower chamber 6e is removed,
It flows backward through the oil passage 12 and is sucked into the first port 8a of the pump 8.

Since the volume of the lower chamber 6e of the tilt cylinder 6 is larger than the volume of the upper chamber 6d, the discharge force of the hydraulic oil becomes excessive and the pump 8
When it is no longer able to inhale it, it flows back to the tank 10 of hydraulic oil via the relief valve 36. In this way, the outboard propulsion device 3 is lowered into the water.

Next, a case where this is carried out in a shallow water at a relatively low speed will be described. In the 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 the sailing is performed while maintaining that state. At this time, the lowest part of the outboard propulsion unit 3 is It is slightly higher than the bottom of the ship, avoiding buffering with the bottom of the water. The inclination angle of the outboard propulsion unit 3 for shallow water traveling is set by rotating the pump 8 in the forward direction to supply oil to the first oil passage 12 and appropriately extending the tilt cylinder 6. Therefore, the thrust of the outboard propulsion unit 3 generated during traveling is transmitted to the hull via the tilt cylinder 6 and the pin 4. To return to normal running, reverse pump 8
Fill the oil passage 14 to shorten the tilt cylinder 6 appropriately,
The front portion of the outboard propulsion device 3 may be butted against the trim rod 7b. At this time, the trim angle is set according to the advanced position of the trim rod 7b.

Generally, the trim angle is set during the cruise. That is, when the pump 8 is rotated in the forward direction and oil is supplied to the first oil passage 12 during traveling, the pressure oil acts on the tilt cylinder 6 and the trim cylinder 7 at the same time. Since the thrust cylinder 6 receives the thrust, the operation of the tilt cylinder 6 is suppressed, and only the two trim rods 7b project to rotate the outboard propulsion unit 3 clockwise by an angle corresponding to the amount.

Lastly, the outboard propulsion unit 3 in water is pulled up to the surface by adjusting the trim angle and rotating the pump 8 in the forward direction to supply oil to the first oil passage 12. At this time, since the switching valve 16, which is a solenoid valve, is connected in the forward direction by the sensor 20, the pressure oil is transferred to the tilt cylinder 6
And the trim cylinder 7 are simultaneously refueled, but since the upper chamber 7d of the trim cylinder 7 is connected to the release valve 26, the inoperative state is maintained until a predetermined high pressure acts, and the pump 8
The entire amount of pressure oil fed from is sent to the tilt cylinder 6. Therefore, the lifting of the outboard propulsion unit 3 above the water is rapidly performed. When the outboard propulsion device 3 is completely lifted above the water and reaches the stroke end, the switching valve 16 is automatically switched from the forward direction to the reverse direction by the operation of the sensor 20, and the trim cylinder 7 is passed through the first branch path 13. Since oil is supplied to the upper chamber 7d, the piston 7c causes the rod 7b to retract while removing the hydraulic oil in the lower chamber 7e. At this time, since the outboard propulsion unit 3 has already reached the rising end, pressure oil does not flow to the tilt cylinder 6 and the total pressure of the pump 8 acts on the trim cylinder, so that the release valve 26
Is opened and the above-mentioned operation is performed.

〔The invention's effect〕

As described above, the present invention provides a hydraulic tilt cylinder mechanism for tilting the outboard propulsion unit provided at the stern between a position in which it is lowered into water and a position in which it is pulled up above water, and a state in which the outboard propulsion unit is lowered into water. And a hydraulic oil trim cylinder mechanism for adjusting the tilt angle with respect to the hull, and a hydraulic oil supply device for switching the hydraulic oil discharge oil passage and the return oil passage by changing the rotation direction of the pump in the forward and reverse directions. Both oil chambers defined by the piston in the hydraulic cylinder of the cylinder mechanism are connected to the discharge oil passage of the hydraulic oil supply device,
The two oil chambers that are communicated with the return oil passage and are the ones of the two oil chambers in which the outboard propulsion device is pulled up by the supply of hydraulic oil are defined by two pistons in the hydraulic cylinder for the trim cylinder mechanism. When hydraulic oil is supplied from the oil chamber, the outboard propulsion unit communicates with the oil chamber inclining to the pull-up side via an oil passage, and the other oil chamber of the hydraulic cylinder for the trim cylinder mechanism is connected to the hydraulic oil. Is communicated with the hydraulic oil tank via an oil passage having a relief valve whose flow direction is directed toward the hydraulic oil tank side, and the two oil passages communicated with the hydraulic cylinder for the trim cylinder mechanism are propelled overboard. When the detection signal of the sensor that detects that the machine is pulled up to the water is not input, the communication destination of these oil passages is as described above, and the detection signal of the sensor is When the force is applied, the hydraulic oil is supplied so that the oil chamber in which the outboard propulsion machine leans toward the pulling up side communicates with the passage leading to the hydraulic oil tank, and the other oil chamber reaches the hydraulic cylinder for the tilt cylinder mechanism. Since the 4-port switching valve that communicates with the oil passage is provided, the operation of pulling the outboard propulsion unit 3 above the water can be performed quickly. Further, since the tilt rod 7b automatically retreats after the outboard propulsion device 3 is pulled up, there is an effect that the work of housing the outboard propulsion device 3 becomes different.

[Brief description of drawings]

The drawing shows an embodiment of the present invention and is an operation diagram showing a stern outboard propulsion device. 3 ... Outboard propulsion device, 6 ... Tilt cylinder, 7 ... Trim cylinder, 8 ... Rotary pump.

Claims (4)

[Claims] 1. A hydraulic tilt cylinder mechanism for tilting an outboard propulsion unit provided at the stern between a position in which it is lowered into water and a position in which it is pulled up above water, and a hull with the outboard propulsion unit being lowered into water. The tilt cylinder mechanism is provided with a hydraulic trim cylinder mechanism for adjusting the tilt angle and a hydraulic oil supply device for switching the hydraulic oil discharge oil passage and the return oil passage by changing the rotation direction of the pump in the forward and reverse directions. Both the oil chambers defined by the pistons in the hydraulic cylinders are communicated with the discharge oil passage and the return oil passage of the hydraulic oil supply device, and the hydraulic oil is supplied from both of the oil chambers to supply the outboard propulsion device. The working oil is to be supplied to the one of the two oil chambers defined by the piston in the hydraulic cylinder for the trim cylinder mechanism. The outboard propulsion unit is connected to the oil chamber that leans toward the pulling up side through an oil passage, and the other oil chamber of this hydraulic cylinder for the trim cylinder mechanism is oriented so that the flow direction of the hydraulic oil is toward the hydraulic oil tank side. It is made to communicate with the hydraulic oil tank through the oil passage having the relief valve, and it is detected that the outboard propulsion machine is pulled up to the water in the two oil passages communicated with the hydraulic cylinder for the trim cylinder mechanism. When the detection signal of the sensor is not input, the communication destinations of these oil passages are as described above, and when the detection signal of the sensor is input, hydraulic oil is supplied to tilt the outboard propulsion unit to the pull-up side. One of the oil chambers is connected to the oil passage leading to the hydraulic oil tank, and the other oil chamber is connected to the oil passage leading to the hydraulic cylinder for the tilt cylinder mechanism. Hydraulic tilting device for outboard propulsion machine according to. 2. A sensor for detecting that the outboard propulsion device has been lifted above the water, wherein the sensor detects the operation of locking means for locking the outboard propulsion device above the water. The hydraulic tilt device for the outboard propulsion device described. 3. The sensor for detecting that the outboard propulsion device has been lifted above the water is a detection switch for detecting the turning end on the water side of the outboard propulsion device lifted above the water. A hydraulic tilt device for an outboard propulsion device according to item 1. 4. The hydraulic system for an outboard propulsion device according to claim 1, wherein the sensor for detecting that the outboard propulsion device has been lifted above the water is a detection switch for detecting the operation end of the tilt cylinder. Tilt device.