JPS60234095A - Tilt apparatus for vessel propulsion machine - Google Patents

Abstract

PURPOSE:To facilitate air vent by installing, in demountable ways, an air vent means for opening the part close to the oil chamber of a hydraulic housing in an oil feeding passage to the atmosphere, onto the hydraulic housing for accommodating a hydraulic pump for feeding the pressurized oil into a tilt cylinder apparatus. CONSTITUTION:In the captioned apparatus, a propulsion unit is installed turnably around a steering rudder shaft onto a tilting bracket supported in vertically tiltable ways onto the stern plate of a hull, and said tilting bracket is tilted by a tilt cylinder apparatus 19. The oil pressure for said tilt cylinder apparatus 19 is supplied from a hydraulic pump 31 which is arranged in an oil chamber 30 formed on a hydraulic housing 18 and driven by an electric motor 32. In this case, an air vent 35A is formed at the position close to the oil chamber 30 of an oil feeding passage 34 which is formed onto the housing 18, for feeding the working oil in a reservoir tank 33 into the oil chamber 30, and said air vent 35A can be closed by a plug 35B.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a tilt device suitable for use in a marine vessel propulsion device such as an outboard motor or an inboard/outboard motor.

[Background technology] A marine propulsion device includes a fixed bracket fixed to the hull,
A tilting bracket supporting the propulsion unit, a tilt cylinder device interposed between the two brackets, a hydraulic housing, and an oil chamber provided in the hydraulic housing. ,
a hydraulic pump capable of pumping hydraulic oil to the tilt cylinder device; an electric motor fixed to the hydraulic housing to cover the oil chamber and drive the hydraulic pump; and a reserve tank formed in the hydraulic housing to contain hydraulic oil. and,
A tilt device is used that includes an oil feed path formed in a hydraulic housing and capable of transferring hydraulic oil in a reserve tank to the oil chamber.

When disassembling and reassembling the hydraulic circuit of the tilt device for maintenance etc., be sure to bleed air from the oil passage and oil chamber formed in the hydraulic housing. It is necessary to fill the oil passage and oil chamber with hydraulic oil.

Conventionally, when assembling the hydraulic circuit of the above-mentioned tilt device, hydraulic oil was supplied directly into the oil chamber from which the cover of the electric motor was removed to bleed air from the oil chamber, or to remove the oil from the electric motor. The hydraulic oil in the reserve tank is guided into the oil chamber from the oil feed path while floating from the covered position with respect to the chamber, and air is removed from the oil feed path and the oil chamber.

However, the conventional air bleeding work described above is extremely complicated, and the installation of the hydraulic circuit makes the work inefficient.
There is a possibility that air may get mixed into the hydraulic circuit.

[Object of the Invention] An object of the present invention is to reliably and easily bleed air from an oil feed passage and an oil chamber formed in a hydraulic housing when assembling a hydraulic circuit.

[Structure of the Invention] In order to achieve the purpose of arrangement, the tilting device for a marine propulsion device according to the present invention is removable from the hydraulic housing, and a portion of the oil passageway adjacent to the oil chamber can be opened to the atmosphere. The device is equipped with an air bleed means.

[Detailed description of the invention] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an outboard motor 10 to which an embodiment of the present invention is applied.
FIG. 2 is a side view showing the main part of FIG. 1, FIG. 3 is a front view of the main part of FIG. FIG. 3 is a circuit diagram showing such a hydraulic circuit.

A clamp bracket 12 as a fixed bracket is fixed to the stern plate 11A of the hull 11.
A swivel bracket 14 as a tilting bracket is pivotally attached to 12 via a tilt shaft 13 so as to be rotatable around a substantially horizontal axis. A propulsion unit 15 is pivotally attached to the swivel bracket 14 via a steering shaft (not shown) so as to be rotatable around the steering shaft. An engine 16 is mounted on the upper part of the propulsion unit 15, and a propeller 17 is provided on the lower part of the propulsion unit 15.

The clamp bracket 12 includes a clamp bracket) 12.
A tilt-silling device 19 is pin-coupled via a hydraulic housing 18 which is fixed to the inner side of the housing. That is, the tilt cylinder device 19 consists of a cylinder 20 and a piston rod 21. The cylinder 20 is pin-coupled to the lower center of the hydraulic housing 18 by a pin 22, and the piston rod 22 is pin-coupled to the upper part of the swivel bracket 14 by a pin 23. are combined.

The inside of the cylinder 20 constituting the tilt cylinder device 19 is connected to a piston 24 fixed to the end of the piston rod 21, and two cylinders 25 on the housing side of the piston rod 21 are connected to each other.
and a lower chamber 26 on the side where the piston rod 21 is not accommodated. The piston 24 has an absorber valve 27 and a return valve 28 arranged in parallel with each other. Absorber valve 27
The valve opens when the pressure in the upper chamber 25 rises abnormally, such as under the impact force caused by a collision with an obstacle, and the lN pressure reaches a predetermined pressure value or higher, and the valve in the royal chamber 25 is opened. The hydraulic oil can be transferred to the lower chamber 26. Return valve 2
The valve 8 can be opened when the pressure in the lower chamber 26 reaches a predetermined pressure value or less under the action of the own weight of the tilted propulsion unit 15 after absorbing the impact force due to the collision with an obstacle. has been done. Note that a free piston 2 is provided in the lower chamber 26.
9 is arranged close to the piston 24. The free piston 29 remains at a fixed position before and after absorbing the shock caused by the collision with the obstacle, and therefore controls the amount of hydraulic oil transferred from the upper chamber 25 to the lower chamber 26 via the absorber valve 27 and the return valve 28. This makes it possible to make the amount of hydraulic oil returned from the lower chamber 26 to the upper chamber 25 the same as that of the cylinder 20.
This makes it possible to reliably match the return position of the piston rod 21 after absorbing the shock to the resting position of the piston rod 21 before absorbing the shock.

The hydraulic housing 18 includes hydraulic equipment and circuits for operating the tilt cylinder device 19.

That is, the hydraulic housing 18 is formed with an oil chamber 30, and a hydraulic pump 31 is disposed inside the oil chamber 30. Further, 32 is an electric motor, and this electric motor 32
is fixed to the hydraulic housing 18, covers the oil chamber 30, and enables the hydraulic pump 31 to be driven. here,
The electric motor 32 is a reversible DC motor, the hydraulic pump 31 is a reversible gear pump, and the pump 31 can be selectively rotated forward or reverse by the motor 31.

Moreover, 33 is a reserve tank, and this reserve tank 33 is integrated with the hydraulic housing 18, and can store hydraulic oil. Further, reference numeral 34 denotes an oil feed passage, which is formed in the hydraulic housing 18 and enables the hydraulic oil in the reserve tank 33 to be transferred to the oil chamber 30.

Here, the hydraulic housing 18 includes an oil chamber 3 of an oil feed path 34.
An air vent 35 that opens a portion close to 0 to the external space
A is formed, and a plug 35B as an air bleed means is removably screwed into this air bleed port 35A.

In addition, 36 is an opening/closing device, and a shuttle piston 37,
It has a first check valve 38A and a second check valve 38B. Here, the first check valve 38A is connected to the pump 3.
The second check valve 38B is opened by the oil pressure supplied through the pipe 40 when the pump 31 rotates in the normal direction, and the second check valve 38B is opened by the oil pressure supplied through the pipe 40 when the pump 31 rotates in the reverse direction. It is considered operational. In addition, the shuttle piston 37 can open the second check valve 38B by the oil supply pressure caused by the forward rotation of the pump 31, and can open the first check valve 38A by the oil supply pressure by the reverse rotation of the pump 31.

The first check valve 38A side of the opening/closing device 36 and the lower chamber 26 of the tilt cylinder device 19 are communicated through a conduit 41. Further, the second check valve 38B side of the opening/closing device 36 and the two groups 25 of the tilt cylinder device 1119 are connected to the pipe line 42.
communicated by.

A check valve 43 is interposed between the oil feed path 34 and the pipe line 39. That is, when the tilt cylinder device 19 reaches the maximum retraction position during a tilt-down operation of the outboard motor 10 and the oil is no longer returned from the lower chamber 26 of the cylinder 20 to the pump 31, the pump 31 still operates. Then, the check valve 43 is opened and the pump 3 is removed from the reserve tank 33.
It is possible to supply hydraulic oil to 1.

Further, a check valve 44 is interposed between the oil feed path 34 and the pipe line 40. That is, when the outboard motor 10 is tilted up, the cylinder internal volume of the tilt cylinder device 19 increases by the volume of the piston rod 21 withdrawn from the cylinder 20, and the amount of circulating hydraulic oil becomes insufficient. The check valve 44 is opened to compensate for the insufficient amount of oil circulating from the reserve tank 33 to the pump 31.

Further, a down relief valve 45 is connected to an intermediate portion of the pipe line 40. That is, when the outboard motor 10 is tilted down, the cylinder internal volume is reduced by the volume of the piston port 21 entering the cylinder 20, resulting in a surplus in the amount of circulating hydraulic oil. The valve 45 is opened to allow oil discharged from the pump 31 to be returned to the reserve tank 33.

Further, an amplifier relief valve 46 is connected to the intermediate portion of the pipe line 41. That is, when the tilt cylinder assembly 919 reaches the maximum extension position during a tilt-up operation of the outboard motor 10, the up-relief valve 46 is opened, allowing the oil discharged from the pump 31 to be returned to the reserve tank 33. There is.

Further, a manual switching valve 47 is interposed between the middle part of the pipe line 41 and the middle part of the pipe line 42, and the manual switching valve 47 is opened.
This allows the tilt cylinder device 19 to be expanded and contracted by manual operation.

Next, the operation of the above embodiment will be explained.

When the electric motor 32 is operated upward and the hydraulic pump 31 is rotated forward, the oil discharged from the pump 31 is sent to the lower chamber 26 of the tilt cylinder device 19, which extends the tilt cylinder device 19 and moves the propulsion unit/) 15. can be tilted up. On the other hand, when the electric motor 32 is operated down and the hydraulic pump 31 is reversed, the oil discharged from the pump 31 is sent to the crown 25 of the tilt cylinder device 19, contracting the tilt cylinder device 19 and tilting the propulsion unit 15. Make it possible to download.

Therefore, when the hydraulic circuit of the tilt cylinder device 19 is disassembled and reassembled for maintenance or the like, the hydraulic pump 31, the electric motor 32, and the reserve tank 33 are assembled to the hydraulic housing 18, and then the air Remove the plug 35B from the drain port 35A, and remove the plug 35B from the oil filler port 3 of the reserve tank 33.
Supply hydraulic oil from 3A. Thereby, the hydraulic oil reaches the oil chamber 30 from the reserve tank 33 via the oil feed path 34, and the residual air in the oil chamber 30 and the oil feed path 34 is discharged to the outside from the air vent 35A. Here, air vent 35
When it is confirmed that the residual air in the oil chamber 30 and the oil passage 34 has been completely discharged and the oil chamber 30 and the oil passage 34 have been filled with the hydraulic oil due to the leakage of the hydraulic oil from A. Air vent 3
Screw the plug 35B onto 5A. After that, electric motor 3
2. By operating the hydraulic pump 31, hydraulic oil is supplied to the lower chamber 26 of the tilt cylinder device 19 which is in the most contracted state, and the remaining air in each oil supply pipe is sequentially transferred to the reserve tank 3.
It is discharged to the outside space through the upper space of No. 3.

According to the above embodiment, the hydraulic circuit is sometimes assembled by attaching and detaching the plug 35B, which serves as an air bleed means, to the air bleed port 35A. It is now possible to bleed air from the oil passage 34 reliably and easily, making the work of assembling the hydraulic circuit more efficient and eliminating the possibility of air getting mixed into the hydraulic circuit. Become.

In the above embodiment, the case where the hydraulic housing 18 is integrated with the clamp bracket 12 has been described, but the hydraulic housing according to the present invention may be arranged inside the hull.

[Effects of the Invention] As described above, the tilt device for a marine propulsion device according to the present invention is removably attached to the hydraulic housing, and the portion of the oil feed path formed in the hydraulic housing that is close to the oil chamber is exposed to the atmosphere. It is equipped with an air bleed means that can be opened. Therefore, when assembling a hydraulic circuit, it is possible to reliably and easily bleed air from the oil passage and the oil chamber by using the air bleed means.

[Brief explanation of drawings]

Fig. 1 is a side view showing an outboard motor to which an embodiment of the present invention is applied, Fig. 2 is a side view showing the main parts of Fig. 1, and Fig. 3 is the main parts of Fig. 1. A partially cutaway front view of the
FIG. 4 is a circuit diagram showing a hydraulic circuit according to the same embodiment. DESCRIPTION OF SYMBOLS 10... Outboard motor, 11... Hull, 12... Clamp bracket, 14... Swivel bracket, 15...
... Propulsion unit, 18... Hydraulic housing, 19.
...Tilt cylinder device, 30...Oil chamber, 31...
Hydraulic pump, 32... Electric motor, 33... Reserve tank, 34... Oil supply path, 35A... Air vent, 35B... Plug. Agent Patent Attorney Osamu Shiokawa

Claims (1)

[Claims] (1) A fixed bracket fixed to the hull, a tilting bracket tiltably supported by the fixed bracket and supporting the propulsion unit, a tilt cylinder device interposed between the two brackets, and a tilt cylinder device a hydraulic housing that supplies hydraulic oil to the pain pressure housing; a hydraulic pump that is disposed within an oil chamber provided in the pain pressure housing and is capable of pumping hydraulic oil to the tilt cylinder device; and a hydraulic pump that is fixed to the hydraulic housing and covers the oil chamber; An electric motor that drives a hydraulic pump, a reserve tank formed in the hydraulic housing and containing hydraulic oil, and a reserve tank formed in the hydraulic housing,
A tilting device for a marine propulsion device comprising an oil feed passage that can transfer hydraulic oil in a reserve tank to the oil chamber, which is detachable from a hydraulic housing and is close to the oil chamber of the oil feed passage. A tilting device for a marine propulsion device, which is equipped with an air bleed means that allows a portion of the vehicle to be exposed to the atmosphere.