JPH0637199B2 - Hydraulic tilting device for outboard propulsion - Google Patents

Description

The present invention relates to an outboard propulsion device such as an outboard motor provided with a stern of a motor boat or a small fishing boat or an outboard propulsion mechanism of an inboard motor for submersible and above-water applications. The present invention relates to a hydraulic tilting device for an outboard propulsion device that tilts between water and, in particular, a tilt mechanism that tiltably supports between a position in which the outboard propulsion device is hydraulically lowered into water and a position in which the outboard propulsion device is pulled up above water. Also, with the outboard propulsion device lowered into the water, a hydraulic cylinder is provided for each of the trim mechanism for adjusting the tilt angle of the propulsion device with respect to the hull,
Further, the present invention relates to a hydraulic tilting device for an outboard propulsion device, in which the respective hydraulic cylinders of the tilt mechanism and the trim mechanism are operated by a common hydraulic pump.

[Conventional technology and its problems]

Conventionally, hydraulic oil is sent from a hydraulic pump that is common to the tilt cylinder and the trim cylinder that pulls the outboard propulsion device out of the water, and the trim cylinder is also used when refueling the tilt cylinder to lift the outboard motor above the water. Since the pressure of the hydraulic pump is applied and the trim rod is projected into the water, aquatic organisms will adhere to the trim rod when it is left as it is, and the seal will be damaged when it is subsequently retracted into the trim cylinder. I have something to do.
Further, in order to avoid such a problem, it is known that the outboard propulsion device is temporarily pulled up and held on the water and then pressure oil is sent to a chamber on the opposite side of the trim cylinder to withdraw the trim rod. (For example, JP-A-60-104492).

However, such a configuration not only complicates the hydraulic circuit, but also requires the lifting operation of the outboard propulsion unit and the operation of moving the trim rod to be performed separately. There was a problem that required a long time.

[Outline of Object and Structure of Invention]

It is an object of the present invention to obtain a hydraulic tilting device for an outboard propulsion device which does not have the above-mentioned problems and has a simple structure and is easy to operate. A hydraulic cylinder provided in both mechanisms, which includes a tilt mechanism for tiltably supporting it in a position where it is pulled up to the water, and a trim mechanism for adjusting the tilt angle with respect to the hull when the outboard propulsion device is lowered into the water. Is connected to a common hydraulic pump, the trim piston is fitted to the trim cylinder that constitutes the trim mechanism, and the trim rod connected to the trim piston is configured to be able to project by the pressure of the hydraulic pump.
A return spring for urging the trim rod in the retreat direction is provided so that the trim rod is elastically returned to the retreat position when the pressure of the hydraulic pump is released.

[Work]

Thus, if pressure oil is supplied to the hydraulic cylinder of the tilt mechanism to pull up the outboard propulsion unit above the water, and once locked in that position, the hydraulic pump is stopped and the hydraulic pressure acting on the trim cylinder is released. The trim rod is retracted into the trim cylinder by the elastic force of the return spring.

〔Example〕

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described with reference to the illustrated embodiment. In the figure, 1 is a stern, at which a stern side for mounting an outboard propulsion device such as an outboard propulsion mechanism of an outboard motor or an inboard motor. A member 2 is provided, and an outboard motor 4 serving as an outboard propulsion device is pivotally supported by a pin 3 so as to be vertically tiltable. 4a is an outboard motor 4
It is a propeller provided at the rear lower end. Stern side member 2
A tilt mechanism 5 and a trim mechanism 6 are interposed between and the outboard motor 4.

The tilt mechanism 5 includes a tilt cylinder 5a pivotally supported on the outboard motor 4 side, a tilt piston 5b fitted therein, and a tilt rod 5c connecting the tilt piston 5b and the stern member 2 to each other. When extended or shortened, the outboard motor 4 is lifted above the water or lowered into the water.

On the other hand, the trim mechanism 6 has a trim cylinder 6a attached to the stern side member 1 and a trim piston 6b fitted thereto, and the trim piston 6b is provided with a trim rod 6c and penetrates the end plate of the trim cylinder 6a. And protrudes rearward, and moves back and forth between two positions, a relatively protruding position and a retracted position. Reference numeral 6d is a return spring, which constantly biases the trim rod 6c in the closing direction. In this embodiment, two trim cylinders 6a are juxtaposed in the plane of the drawing, although it is not clear in the figure. Thus, if hydraulic oil is slightly sent to the lower chamber 6f of the trim cylinder 6a, the trim rod 6c projects outward against the return spring 6d and tilts the outboard motor 4 clockwise by a desired angle. That is, the tilt angle of the outboard motor 4 with respect to the hull can be adjusted.

Reference numeral 7 denotes a hydraulic pump that is a hydraulic pressure source that supplies pressure oil to the tilt cylinder 5a and the trim cylinder 6a via a switching valve 8 described later. The hydraulic pump 7 is a gear pump, and the discharge port is determined depending on the rotation direction. The hydraulic pump 7 has two suction ports 7a and 7b which also serve as discharge ports, which are directly connected to the switching valve 8 and the check valves 7c and 7d to the oil tank 11.
It is indirectly connected via. The check valves 7c and 7d allow only the oil flow to the hydraulic pump 7 side. Therefore, when the hydraulic pump 7 rotates normally, the working oil in the oil tank 11 passes through the check valve 7d and the suction port. 7b, is supplied from the suction port 7a to the chamber above the switching valve 8 as pressure oil, and when reversing, passes through the check valve 7c and the throttle 7f, and the suction port 7
It is sucked from a and is supplied as pressure oil from the suction port 7b to the chamber below the switching valve 8.

The switching valve 8 includes a free piston 8b in a cylindrical oil chamber 8a.
Is slidably provided, and both ends thereof communicate with the upper chamber 5d and the lower chamber 5e of the tilt cylinder 5a via the relief valves 8c, 8c and the first oil passage 9a and the second oil passage 9b which are continuous with the relief valves 8c, 8c, respectively. There is. Reference numerals 8d and 8e denote projecting pins projectingly provided on both ends of the free piston 8b.
The seat 8c is blocked to keep the valve open. That is, when pressure oil is supplied from the discharge port 7a of the hydraulic pump 7 to the first oil passage 9a, the lower oil opens the relief valve 7c and flows back into the oil tank 11, and the free piston 8b is shown in the figure. The protrusion pin 8e moves downward and prevents the lower relief valve 8c from being seated, and keeps the valve open. Thus, the first return oil passage 9c, which will be described later, is opened, and the working oil is transferred from the switching valve 8 to the relief valve 7e.
And is returned to the oil tank 11 via.

In addition, the first oil passage 9a is branched in the middle, and the trim cylinder 6
It is also connected to the lower chamber 6f of a. 9c is the first oil passage 9
The first return oil passage 9c is a first return oil passage that connects a to the oil tank 11, and a relief valve 9d for maintaining the first return oil passage 9c at a predetermined hydraulic pressure is provided. Further, 9e is a manual opening / closing valve provided in the second oil passage 9b, and by closing this, the inflow or outflow of the hydraulic oil to / from the lower chamber 5e is prevented, so that the outboard motor 4 is placed in water or above water. It can be locked in the raised position.

The operation of this embodiment will be described. When the boat is sailing, the outboard motor 4 is lowered into the water, and the front side of the outboard motor 4 in the traveling direction is in contact with the trim rod 6c. Yotte, propeller 4
When a rotates in the forward direction, its thrust pushes the hull forward through the trim rod 6c. Propeller 4a while the ship is navigating
To adjust the tilt angle of the trim cylinder 6a, the hydraulic pump 7 is operated to supply pressure oil from the discharge port 7a to the lower chamber 6f of the trim cylinder 6a through the first oil passage 9a and the first return oil passage 9c, and the elasticity of the return spring 6d is adjusted. The trim rod 6c is advanced to the outside to tilt the outboard motor 4 clockwise, or the first manual on-off valve 9e is opened to release the pressure oil in the trim cylinder 6a to the first return oil passage 9c. This is done by tilting the outboard motor 4 counterclockwise by the elastic force of the return spring 6d.

After finishing the navigation, the outboard motor 4 is pulled up to the water. That is, from the discharge port 7a that operates the hydraulic pump 7 to the first
When pressure oil is supplied to the upper chamber 5d of the tilt cylinder 5a through the oil passage 9a, the tilt rod 5c extends to the outside, and the outboard motor 4 tilts counterclockwise about the pin 3 and is lifted above the water. After that, if the second manual open / close valve 9f is closed, the outboard motor 4 is locked on the water even if the supply of pressure oil is stopped thereafter. The means for locking the outboard motor 4 on the water is not limited to this method, and it is also possible to prevent the outboard motor 4 from naturally descending into the water by using a strut rod or the like. In the process of raising the outboard motor 4 above the water, a part of the pressure oil sent to the tilt cylinder 5a through the first oil passage 9a is part of the first oil.
Although it also acts on the lower chamber 6f of the trim cylinder 6a through the return oil passage 9c to push the trim rod 6c to the outside, the pressure oil in the first oil passage 9a is removed after the outboard motor 4 is lifted above the water. If so, the elastic force of the return spring 6d causes the trim cylinder 6a to retract.

〔The invention's effect〕

As described above, according to the present invention, the trim piston having the tilt mechanism and the trim mechanism, the hydraulic cylinders provided for both the mechanisms are operated by the common hydraulic pump, and the trim cylinder forming the trim mechanism has the trim rod having the trim rod. Is configured to be able to project by the pressure of the hydraulic pump, and a return spring for urging the trim rod in the retreating direction is provided so that when the pressure of the hydraulic pump is released, the trim rod is elastically returned to the retracted position. Therefore, after supplying pressure oil to the hydraulic cylinder of the tilt mechanism, pulling the outboard propulsion unit above the water and temporarily locking it in that position, stop the hydraulic pump and release the hydraulic pressure that acts on the trim cylinder. if,
The trim rod retreats into the trim cylinder by the elastic force of the return spring, and the trim rod 6c is the return spring 6d.
Since it automatically retreats into the trim cylinder 6a by the resilience, the aquatic organisms do not adhere to the trim rod 6c, and a special operation for retreating the trim rod 6c into the trim cylinder 6a is not required. In addition to being simple, the hydraulic circuit is also simple, and the manufacturing is easy.

[Brief description of drawings]

The drawings are hydraulic circuit diagrams showing an embodiment of the present invention. 4 ... Outboard motor, 5 ... Tilt mechanism, 6 ... Trim mechanism,
7 ... hydraulic pump, 8 ... switching valve, 9a ... first oil passage, 9c ... first return oil passage.

Claims (3)

[Claims] 1. A tilt mechanism for tiltably supporting an outboard propulsion unit provided at the stern between a position lowered into water and a position pulled up above water, and a hull with the outboard propulsion unit lowered into water. And a trim mechanism that adjusts the tilt angle with respect to each other. The hydraulic cylinders provided in both mechanisms are connected to a common hydraulic pump, and the trim piston that is included in the trim cylinder that constitutes the trim mechanism is connected to the trim piston. The trim rod is configured to be able to project by the pressure of the hydraulic pump, and a return spring for urging the trim rod in the retracting direction is provided so that when the pressure of the hydraulic pump is released, the trim rod is elastically returned to the retracted position. A hydraulic tilting device for an outboard propulsion system. 2. The hydraulic tilting device for an outboard propulsion device according to claim 1, wherein the outboard propulsion device is an outboard motor. 3. The hydraulic tilting device for an outboard propulsion device according to claim 1, wherein the outboard propulsion device is an outboard propulsion mechanism for the outboard motor.