JP2001001989A - Trim tilt device for marine propeller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the man-hour for processing a cylinder forming a tilt device for easy and secure attainment of stainless properties, by covering the cylinder of a cylinder device with a tank forming a hydraulic fluid supply and delivery apparatus, in a device which tilt-operates a marine propeller by expanding and contracting a cylinder device. SOLUTION: This marine propeller is provided with a swivel bracket journaled to a clamp bracket, which is fixed to the stern plate of a hull, through a tilt shaft so as to be capable of tilting, and the cylinder device 21 of a trim tilt device 20 provided between the clamp bracket and the swivel bracket. A propulsion unit is tilted in a trim zone or a tilt zone by supplying hydraulic fluid from a hydraulic fluid supply and delivery apparatus 22 to the cylinder device 21 or controlling its delivery. The part of the cylinder 41 of the cylinder device 21, protruding outward from the cylinder guide 34 of a housing 31 in a trim operation zone, is covered with a sub tank housing 28 forming the hydraulic fluid supply and delivery apparatus 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trim / tilt device for a marine propulsion device for an outboard motor, an inboard / outboard motor, and the like.

[0002]

2. Description of the Related Art Conventionally, as a trim / tilt device for a marine propulsion device, a cylinder device is interposed between a hull and a marine propulsion device tiltably supported on the hull, and a cylinder is provided from a hydraulic oil supply / discharge device. There is an apparatus that controls the supply or discharge of hydraulic oil to the apparatus so that the cylinder apparatus expands and contracts to perform the trim operation and the tilt operation of the marine propulsion device.

As a cylinder device of a conventional trim / tilt device for a marine propulsion device, as described in US Pat. No. 3,325,240, a housing forming a large-diameter trim chamber used in connection with one of a hull and a marine propulsion device. A cylinder that is telescopically inserted into a trim chamber of the housing and forms a small-diameter tilt chamber, and is fixed to a cylinder end in the trim chamber of the housing, and a first trim chamber on the cylinder housing side of the trim chamber and a cylinder not housed. A large-diameter trim piston partitioned into a second trim chamber on the side, a piston rod used to be connected to the other of the hull and the marine propulsion device, and inserted into the tilt chamber of the cylinder so as to extend and contract, and a tilt chamber of the cylinder. And a small diameter partitioning the tilt chamber into a first tilt chamber on the piston rod housing side and a second tilt chamber on the non-piston rod housing side. And a tilt piston. In this prior art, after the cylinder of the cylinder device protrudes outward from the housing in the trim operation region, the piston rod of the cylinder device protrudes outward from the cylinder in the tilt operation region.

[0004]

However, the prior art has the following problems. The cylinder of the cylinder device is a member that transmits a constant propulsion force (axial compression force) between the hull and the marine propulsion device. It is necessary to secure a constant strength in a small cross section. It will be composed of materials. At this time, in order to make the cylinder stainless steel against outside water, it is necessary to use a high-grade stainless steel or other stainless steel material, or to perform a stainless steel treatment such as painting, which leads to an increase in cost.

[0005] The cylinder of the cylinder device repeatedly comes into sliding contact with the seal member of the cylinder guide provided in the housing in the trim operation area, and the outer surface of the cylinder must avoid the generation of rust which may scratch the seal member. . For this reason, from this point as well, it is necessary to make the cylinder stainless steel against external water, etc., and it is necessary to adopt a high-grade stainless steel or other stainless steel material, or to apply a stainless steel treatment such as painting to increase the cost. Invite.

When the hydraulic oil supply / discharge device is integrated with the cylinder device, a tank constituting the hydraulic oil supply / discharge device is provided so as to protrude largely outward and laterally around the cylinder base of the cylinder device. There is a limit to compactness.

Although the above is a problem peculiar to the trim / tilt device, the above problem is not limited to the trim / tilt device but is a problem common to widely used tilt devices.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the number of processing steps of a cylinder constituting a tilt device, to easily and surely make the cylinder stainless, and to make the tilt device compact.

[0009]

According to a first aspect of the present invention, there is provided a hydraulic oil supply / discharge device in which a cylinder device is interposed between a hull and a marine propulsion device which is tiltably supported on the hull. In a tilting device for a marine propulsion device that controls the supply or discharge of hydraulic oil to or from a cylinder device to extend and contract the cylinder device to tilt the marine propulsion device, the cylinder device is connected to one of the hull and the marine propulsion device And a piston rod used by being connected to the other, and the cylinder of the cylinder device is covered by a tank constituting a hydraulic oil supply / discharge device.

According to a second aspect of the present invention, in the first aspect, the cylinder device forms the cylinder in a cylinder block, and the hydraulic oil supply / discharge device fixes the pump to a pump housing. The pump housing is formed separately from the cylinder block and is bolted.

According to a third aspect of the present invention, a cylinder device is interposed between a hull and a marine propulsion device which is tiltably supported on the hull, and hydraulic oil is supplied from the hydraulic oil supply / discharge device to the cylinder device. In the trim / tilt device for a marine propulsion device that controls the supply or discharge of the marine vessel propulsion device by extending and contracting the cylinder device to trim and tilt the marine propulsion device, the cylinder device is connected to one of the hull and the marine propulsion device. A housing forming a large-diameter trim chamber,
A cylinder which is telescopically inserted into a trim chamber of the housing to form a small-diameter tilt chamber, and which is fixed to a cylinder end in the trim chamber of the housing, and wherein the trim chamber is a first trim chamber on a cylinder housing side; A second trim chamber, a large-diameter trim piston, a piston rod that is used in connection with the other of the hull and the boat propulsion device, and is extendably inserted into the tilt chamber of the cylinder, A cylinder having a small-diameter tilt piston fixed to the end of the piston rod and partitioning the tilt chamber into a first tilt chamber on the piston rod housing side and a second tilt chamber on the non-piston rod housing side; Has a portion that protrudes outward from the housing in the trim operation area, which is covered by a tank constituting a hydraulic oil supply / discharge device.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the cylinder device forms the housing in a cylinder block, and the hydraulic oil supply / discharge device fixes the pump to the pump housing. The pump housing is formed separately from the cylinder block and is bolted.

[0013]

According to the first and third aspects of the present invention, the following effects are obtained. The cylinder of the cylinder device is covered with the tank and does not come into contact with outside water, and is easily and reliably rusted by the hydraulic oil in the tank. For this reason, when the cylinder is made of a metal material such as an iron-based material so as to secure a constant strength in a small cross section as a member for transmitting a constant propulsive force (axial compression force) between the hull and the marine propulsion device. Also, there is no need to form the cylinder from a high-grade stainless steel material or to perform a stainless steel treatment such as painting, so that the number of processing steps for the stainless steel treatment can be reduced and the cost can be reduced.

Since the outer surface of the cylinder is made rust and does not rust as described above, even when the cylinder repeatedly slides on the seal member of the cylinder guide provided in the housing in the trim operation area, the outer surface of the cylinder is kept in contact with the seal member. Does not scratch.

The tank of the hydraulic oil supply / discharge device covers the entire cylinder protruding outward from the housing over the entire area in the longitudinal direction of the cylinder. For this reason, the tank extends along the longitudinal direction of the cylinder, so that the tank does not protrude laterally and outward around the base of the cylinder, and the tilt device can be made compact.

According to the second and fourth aspects of the present invention, the following operations are provided. By integrating the cylinder block and the pump housing by bolting, the piping of the tilt device is housed and the overall size and installation space are reduced, while the pump housing is formed separately by molding both. It becomes easy, and moldability and workability can be improved.
Also, the combination of the capacity and length of the cylinder and the capacity of the pump can be changed in various ways, and the compatibility with various types of marine propulsion machines can be improved. Further, in the event of a failure of the tilt device or the like, it is sufficient to replace one of the cylinder block and the pump housing, and the maintainability is good.

[0017]

FIG. 1 is a schematic diagram showing a marine propulsion device according to a first embodiment, FIG. 2 is a schematic diagram showing a trim / tilt device, FIG. 3 is a side view of FIG. 2, and FIG. FIG. 5 is a schematic view showing a state in which a hydraulic oil supply / discharge device is incorporated into a housing of a cylinder device, FIG. 6 is a schematic diagram showing a hydraulic circuit of a trim / tilt device, and FIG. FIG. 8 is a schematic diagram showing a tilt device, and FIG. 8 is a schematic diagram showing a hydraulic circuit of the trim / tilt device.

(First Embodiment) (FIGS. 1 to 6) As shown in FIG. 1, a marine propulsion device 10 (an outboard motor, but may be an inboard / outboard motor) is mounted on a stern plate 11A of a hull 11 as shown in FIG. A clamp bracket 12 is fixed, and a swivel bracket 14 is attached to the clamp bracket 12 via a tilt shaft 13.
Are pivotally mounted so as to be tiltable about a substantially horizontal axis. A propulsion unit 15 is pivotally attached to the swivel bracket 14 via a not-shown substantially vertically arranged turning shaft so as to be rotatable around the turning shaft. An engine unit 16 is mounted on an upper part of the propulsion unit 15, and a propeller 17 is provided on a lower part of the propulsion unit 15.

That is, the marine propulsion device 10 is supported by a clamp bracket 12 fixed to the hull 11 via a tilt shaft 13 and a swivel bracket 14 so that the propulsion unit 15 can be tilted. The cylinder device 21 of the trim / tilt device 20 is interposed between the cylinder device 2 and the hydraulic device supply / discharge device 22.
By controlling the supply or discharge of the hydraulic oil to the cylinder 1, the propulsion unit 15 can be tilted in the trim area or the tilt area in FIG. still,
The boat propulsion device 10 can obtain an optimum cruising attitude with respect to a change in water surface load by holding the propulsion unit 15 at a relatively gentle inclination in the trim area.

(Cylinder Device 21) As shown in FIGS. 1 and 2, the cylinder device 21 of the trim / tilt device 20 has a housing 31 used in connection with the clamp bracket 12, and the housing 31 has a large diameter. Trim room 32
Is formed. The housing 31 is made of, for example, an aluminum alloy casting, and has a mounting pin insertion hole 33 to the clamp bracket 12.

The cylinder device 21 has a cylinder 41 which is inserted into the trim chamber 32 from the cylinder guide 34 provided at the open end of the housing 31 so as to be able to expand and contract during a trim up / down operation in the trim area. A small-diameter tilt chamber 42 is formed in the cylinder 41. The cylinder guide 34 has a seal member 35 such as an O-ring that is screwed to the open end of the housing 31 and is in close contact with the trim chamber 32, and has a seal member 36 such as an O-ring that slides on the outer surface of the cylinder 41. .

The cylinder device 21 includes the housing 3
A large-diameter trim piston 51 is screwed and fixed to an end of a cylinder 41 in one trim chamber 32. The trim piston 51 is slidably contacting the inner surface of the trim chamber 32.
The trim chamber 32 is provided with a seal member 52 such as a ring, and divides the trim chamber 32 into a first trim chamber 32A on which the cylinder 41 is housed and a second trim chamber 32B on which the cylinder 41 is not housed.

The cylinder device 21 has a piston rod 61 connected to the swivel bracket 14, and this piston rod 61 is provided at the open end of the cylinder 41 during a tilt up / down operation in a tilt range. It is inserted into the tilt chamber 42 from the rod guide 43 so as to be extendable and contractible. The rod guide 43 is provided for the piston rod 6.
1 is provided with a seal member 44 such as an O-ring that slides on the outer surface. The piston rod 61 is provided with a mounting pin insertion hole 62A for the swivel bracket 14 in the mounting joint 62.

The cylinder device 21 includes a cylinder 41
Has a small-diameter tilt piston 71 fixed to an end of a piston rod 61 in a tilt chamber 42 through a washer 71A with a nut 71B. The tilt piston 71 is
The cylinder 41 includes a sealing member 72 such as an O-ring that slides on the inner surface of the cylinder 41. The tilt chamber 42 is provided with a first tilt chamber 42 </ b> A on the side where the piston rod 61 is accommodated, and a piston rod 61.
And the second tilt chamber 42 </ b> B on the side that does not accommodate the second tilt chamber 42 </ b> B.

The tilt piston 71 has an extension side buffer valve 73 and a check valve 74. The extension side buffer valve 73 opens at a set pressure to protect the hydraulic circuit when an impact force in the extension direction of the cylinder device 21 is applied, such as at the time of a driftwood collision with the propulsion unit 15, and the first tilt chamber 42A. Second hydraulic fluid
The piston rod 61 is transferred to a later-described free piston 81 in the tilt chamber 42B so that the piston rod 61 can be extended. At this time, the free piston 81 remains at that position, and only the tilt piston 71 moves. The check valve 74 attempts to return the tilt piston 71 of the piston rod 61 to the original position (the position where the free piston 81 stays) by the weight of the propulsion unit 15 after the above-described opening of the extension side buffer valve 73. Open when tilt piston 71 and free piston 81
Is returned to the first tilt chamber 42A.

The cylinder device 21 includes a cylinder 41
And a free piston 81 set at a position in contact with the normal tilt piston 71 in the second tilt chamber 42B.
The free piston 81 is in contact with the inner periphery of the cylinder 41
A seal member 83 such as a ring is provided.

However, in the cylinder device 21, the cylinder 41 is formed by forging with an iron-based material.
The outer pipe 41B and the above-described rod guide 43 are integrally formed by forging, thereby reducing the number of assembling steps and increasing the strength in terms of strength. Then, the cylinder 41 sandwiches the inner pipe 41A between a concave portion provided on the inner end surface of the rod guide portion 43 and a concave portion provided on the inner end surface of the trim piston 51 screwed to the outer pipe 41B, It is a tilt cylinder assembly. Thereby, the cylinder 41 is connected to the inner pipe 4
1A and an outer pipe 41B, and a gap between the inner pipe 41A and the outer pipe 41B is formed in the first trim chamber 3.
A communication passage 46 connects the first tilt chamber 42A to the second tilt chamber 42A. That is, the first trim chamber 32A is directly connected to the first flow path 91 provided in the housing 31, and the first tilt chamber 42A is connected to the passage 9 provided in the inner pipe 41A of the cylinder 41.
1A, a communication passage 46 of the cylinder 41, a passage 91B provided in the outer pipe 41B of the cylinder 41, a passage 91C provided in the trim piston 51, and a first trim chamber 32A via the first trim chamber 32A. Thereby, the first trim chamber 32A
And the first tilt chamber 42A are used for trim operation and tilt operation.
(a) In the contraction stroke, the supply side of the hydraulic oil supply / discharge device 22 is communicated via the first flow passage 91, and (b) in the extension stroke, the discharge side of the hydraulic oil supply / discharge device 22 is communicated via the first flow passage 91. Will be contacted.

Further, in the cylinder device 21, the trim piston 51 includes the second trim chamber 32B and the second tilt chamber 4B.
There is provided a through-hole-shaped communication passage 53 communicating with 2B.
That is, the second trim chamber 32B is directly connected to the second flow path 92 provided in the housing 31, and the second tilt chamber 42B
Is connected to the second flow path 92 via the free piston 81, the communication passage 53 of the trim piston 51, and the second trim chamber 32B. Accordingly, the second trim chamber 32B and the second tilt chamber 42B are connected to the supply side of the hydraulic oil supply / discharge device 22 via the second flow path 92 in the (a) extension stroke of the trim operation and the tilt operation, and ( b) In the contraction stroke, the discharge side of the hydraulic oil supply / discharge device 22 is communicated via the second flow path 92.

(Hydraulic oil supply / discharge device 22) Hydraulic oil supply / discharge device 2
Reference numeral 2 denotes a reversible motor 23, a reversible gear pump 24, a tank 25, and a switching valve-equipped flow path 26, and the first of the cylinder device 21 via the first flow path 91 and the second flow path 92.
Trim room 32A, second trim room 32B, first tilt room 4
2A, the hydraulic oil can be supplied to and discharged from the second tilt chamber 42B.

At this time, as shown in FIG. 5, the hydraulic oil supply / discharge device 22 is mounted on a motor installation surface 31A formed on a housing 31 of the cylinder device 21 on a mounting base 23 of the motor 23.
A is installed and fixed with bolts 27, and the motor 23 is juxtaposed beside the cylinder 41 of the cylinder device 21.

The hydraulic oil supply / discharge device 22 stores hydraulic oil as a tank 25 using a hollow portion formed on the side of the trim chamber 32 in the housing 31 of the cylinder device 21. In the tank 25 provided in the housing 31, an opening 25A is provided in a portion corresponding to a lower portion of the motor 23, and the opening 25A is provided in the opening 25A.
The fitting portion 23B connected to A is a sealing member 25 such as an O-ring.
It is fitted airtight through B. And the housing 31
A pump 24 is fixedly disposed under the motor 23 in a tank 25 provided in the tank 25 in a state of being immersed in oil, and an output shaft 23C protruding from a fitting portion 23B of the motor 23 and a driven shaft 24A of the pump 24. Is connected.

However, in the present embodiment, the cylinder 41 of the cylinder device 21 is moved in the trim operation range by the housing 3.
A portion protruding outward from one of the cylinder guides 34 is a sub-tank housing 28 that constitutes the hydraulic oil supply / discharge device 22.
Covered by. The sub-tank housing 28 is made of, for example, a resin. The lower-end opening of the sub-tank housing 28 is fitted around the cylinder guide 34, and the lower-end flange 28A of the sub-tank housing 28 is fitted with an O-ring 29A.
And is liquid-tightly fastened to the opening end face of the housing 31 by bolts 30. And the sub tank housing 2
A seal member 28B such as an oil seal that allows the piston rod 61 to slidably contact the piston rod 61 in a liquid-tight manner is provided at the upper end opening of the nozzle 8. Thereby, the sub-tank housing 28 is erected along the longitudinal direction of the cylinder 41 and the piston rod 61 around the cylinder 41 and the piston rod 61 with a certain gap therebetween to form a sub-tank 28C,
The sub tank 28C communicates with the tank 25 of the housing 31 via a passage 28D provided in the cylinder guide 34 and a passage 28E provided in the housing 31.
3 and 4, reference numeral 28F denotes an oiling plug.

The hydraulic oil supply / discharge device 22 also incorporates a switching valve-equipped flow path 26 for connecting the pump 24 to the first flow path 91 and the second flow path 92 in the housing 31.
6, a shuttle type switching valve 101, check valves 102, 103,
Compression side relief valve 104, extension side relief valve 105, compression side buffer valve 106A, extension side buffer valve 106B, manual switching valve 107
Is provided.

The shuttle type switching valve 101 has a shuttle piston 111, a first check valve 112A and a second check valve 112B located on both sides of the shuttle piston 111, and the first check valve 112 of the shuttle piston 111.
A first shuttle chamber 113A is defined on the A side, and a second shuttle chamber 113B is defined on the second check valve 112B side of the shuttle piston 111. First check valve 112A
Is the first through the pipe 93A by the forward rotation of the pump 24.
The second check valve 112B is opened by the oil supply pressure applied to the shuttle chamber 113A and opened by the oil supply pressure applied to the second shuttle chamber 113B via the pipe 93B by the reverse rotation of the pump 24. I have.
Further, the shuttle piston 111 can open the second check valve 112B by the oil supply pressure due to the forward rotation of the pump 24, and can open the first check valve 112A by the oil supply pressure due to the reverse rotation of the pump 24.

The first check valve 112A of the shuttle type switching valve 101 is connected to the first flow path 91, and the second check valve 1
12B is connected to the second flow path 92.

Connection line 94 between pump 24 and tank 25
A is provided with a check valve 102. That is, at the time of the tilt-up operation of the marine propulsion device 10, the internal volume of the first tilt chamber 42A increases by the retreat volume of the piston rod 61 and the amount of circulating oil of the working oil becomes insufficient. Is opened to allow the tank 25 to pump 24 to compensate for the circulating oil shortage.

Connection line 94 between pump 24 and tank 25
A check valve 103 is interposed in B. That is, at the time of the trim down operation of the marine propulsion device 10, when the trim piston 51 reaches the maximum contraction position and the trim down is completed, and the return oil from the second trim chamber 32B to the pump 24 is exhausted, the pump 24 is still operated. When activated, the check valve 10
3 is opened to supply hydraulic oil from the tank 25 to the pump 24.

The contraction-side relief valve 104 is connected to the first shuttle chamber 113A to return the remaining oil amount of the rod to the tank 25 at the time of tilt-down and trim-down operations. The circuit pressure is released to the tank 25 at the set pressure in order to protect the hydraulic circuit when the operation is continued.

The extension side relief valve 105 is built in the shuttle piston 111, and when the tilt-up operation is performed, the hydraulic pressure when the pump 24 continues to operate even after the piston rod 61 reaches the maximum extension position and the tilt-up is completed. The circuit pressure is released to the tank 25 at a set pressure for circuit protection.

The compression side buffer valve 106A is connected to the cylinder device 21.
When the tilt piston 71 and the free piston 81 are traveling at an intermediate position of the tilt chamber 42 and an impact force in the direction of contracting the piston rod 61 is applied to the propulsion unit 15 (an obstacle collides with the propulsion unit 15 from behind). In such a case, the circuit pressure is released to the tank 25 at a set pressure for protecting the hydraulic circuit.

The extension side buffer valve 106B is connected to the cylinder device 21.
While the tilt piston 71 and the free piston 81 are traveling at an intermediate position of the tilt chamber 42, the circuit is operated at a set pressure to protect the hydraulic circuit when any impact force in the direction of extending the piston rod 61 is applied to the propulsion unit 15. Pressure to tank 2
5 to escape.

The manual switching valve 107 is connected to the first flow path 91 and the second flow path 91.
The first flow path 91 and the second flow path
By conducting the flow path 92, the cylinder device 21 is manually expanded and contracted, and the propulsion unit 15 can be tilted between the trim area and the tilt area.

The operation of the trim / tilt device 20 will be described below. (1) Trim-up When the motor 23 and the pump 24 are rotated in reverse, the oil discharged from the pump 24 flows from the pipe 93B to the second shuttle chamber 113B of the shuttle type switching valve 101, and the shuttle piston 111
Moves to the right in FIG. 6, and pushes and opens the first check valve 112A. In addition, the hydraulic oil that has flowed into the second shuttle chamber 113B of the switching valve 101 uses its own pressure to generate the second check valve 112B.
And is sent to the second trim chamber 32B via the pipe line 92 as shown by the solid arrow. In this way, the second
The hydraulic oil flowing into the trim chamber 32B tries to push up the trim piston 51. The hydraulic oil in the second trim chamber 32B not only acts on the trim piston 51, but also
Tilt piston 71 close to trim piston 51
Also acts through the through-hole-shaped communication passage 53 of the trim piston 51, but the area of the communication passage 53 is set such that the pressure receiving area of the trim piston 51 is larger than the pressure receiving area of the tilt piston 71. Therefore, the trim piston 51
Pushes up and moves the tilt piston 71.
At this time, the hydraulic oil in the first trim chamber 32A is supplied to the first flow path 91.
The trim piston 51 moves and the cylinder 41 and the piston rod 61 protrude out of the housing 31 to trim up. Then, the trim piston 51 comes into abutment with the stroke end in the trim-up direction in the first trim chamber 32A, and the maximum trim-up occurs.

(2) Tilt Up In the above (1), after the trim piston 51 has moved to the maximum trim up, the hydraulic oil is further moved to the second trim chamber 32.
B, the hydraulic oil pressure in the second trim chamber 32 </ b> B causes the through-hole communication passage 5 provided in the trim piston 51.
3 through a free piston 81 and a tilt piston 71
To the end face on the side opposite to the piston rod 61. Thereby, the hydraulic oil supplied to the second trim chamber 32B is supplied to the cylinder 41
A second portion gradually formed between the trim piston 51 and the free piston 81 (and the tilt piston 71) within
Hydraulic oil filled in the tilt chamber 42 </ b> B and in the first tilt chamber 42 </ b> A passes through the passage 9 provided in the rod guide 43 of the cylinder 41.
1A, communication passage 46 of cylinder 41, passage 91B provided in outer pipe 41B of cylinder 41, passage 91C provided in cylinder guide 34 of housing 31, first trim chamber 32
Since the air flows out to the first flow path 91A via the line A, only the tilt piston 71 moves. As a result, the piston rod 61 protrudes outward from the cylinder 41 and tilts up. Then, the tilt piston 71 comes into contact with the stroke end in the tilt-up direction in the first tilt chamber 42A, and the maximum tilt-up occurs.

(3) Tilt-down When the motor 23 and the pump 24 rotate forward, the oil discharged from the pump 24 flows from the pipe 93A to the first shuttle chamber 113A of the switching valve 101, and the shuttle piston 111 moves to the left in FIG. It moves and pushes the second check valve 112B open. Also, the hydraulic oil that has flowed into the first shuttle chamber 113A of the switching valve 101 pushes and opens the first check valve 112A with its own pressure, and as shown by the dashed arrow, from the first flow path 91 to the first trim chamber 32A, Passage 91C, passage 91B, cylinder 41
Of the first tilt chamber 42A via the communication passage 46 and the passage 91A.
Sent to In this manner, the hydraulic oil is supplied to the first tilt chamber 4
2A, the hydraulic oil is supplied to the tilt piston 71
(And the free piston 81). At this time, the operating oil in the first trim chamber 32A is
Since the pressure receiving area of the tilt piston 71 facing the first tilt chamber 42A is set to be larger than the pressure receiving area of the trim piston 51 facing the first trim chamber 32A, the tilt piston 71 Only the tilt piston 71 is pushed down until the strikes against the trim piston 51. As a result, the piston rod 61 enters into the cylinder 41 and tilts down. At this time, the hydraulic oil in the second tilt chamber 42B flows out of the through passage 53 of the trim piston 51 through the second trim chamber 32B to the second flow path 92, and eventually returns to the pump 24. And
The trim piston 51 in which the tilt piston 71 is parked at the stroke end of the trim chamber 32 in the trim-up direction
Then, the tilt down is completed.

(4) Trim Down After the end of the tilt down in the above (3), when the hydraulic oil is further supplied to the first trim chamber 32A and the first tilt chamber 42A, the tilt piston 71 (and the free piston 81) is moved. The cylinder 41 and the piston rod 61 are pushed into the housing 31 because the hydraulic oil in the second trim chamber 32B flows out to the second flow path 92 because the hydraulic oil in the second trim chamber 32B is pushed down toward the second trim chamber 32B integrally with the trim piston 51. Immerse yourself further and trim down. Then, the trim piston 51 comes into contact with the stroke end in the trim down direction in the second trim chamber 32B, and the trim down ends.

Here, in the trim / tilt device 22, the process of shifting from the trim-up to the tilt-up in (1) and (2) and the tilt-down to the trim-down in (3) and (4) are performed. The effective area of the pistons 51 and 71 changes between the large-diameter trim piston 51 and the small-diameter tilt piston 71 during the transition process. Therefore, the transition speed of the piston rod 61 is “trim range <tilt range”, and the force acting on the piston rod 61 is “trim range> tilt range”. That is, in the above embodiment, (a) in the trim area, the trim angle can be finely adjusted in opposition to the propeller thrust,
Shallow navigation is also possible. (B) In the tilt area, the tilt unit can be quickly tilted up / down with a relatively small force required to support its own weight.

The procedure for assembling the trim / tilt device 20 is as follows. (1) The cylinder 41 has an inner pipe 41A and a piston rod 6
1. Insert the tilt piston 71 and the free piston 81, and insert the trim piston 5 into the outer pipe 41B of the cylinder 41.
1 constitutes a tilt cylinder assembly.

(2) Insert the tilt cylinder assembly of the above (1) into the trim chamber 32 of the housing 31,
Screw the cylinder guide 34.

(3) Put the sub-tank housing 28 over the cylinder 41 and the piston rod, and
8 is fastened to the housing 31 by bolts 30.

(4) Finally, the mounting joint 6 is attached to the piston rod 61 projecting from the sub tank housing 28.
Screw 2 on.

Therefore, according to the present embodiment, the following operations are provided. The cylinder 41 of the cylinder device 21 is covered with the tank 28C and does not come into contact with outside water, and is easily and reliably rusted by the hydraulic oil in the tank 28C. For this reason,
Even when the cylinder 41 is made of a metal material such as an iron-based material so as to secure a constant strength in a small cross section as a member for transmitting a constant propulsion force (axial compression force) between the hull 11 and the propulsion unit 15. In addition, there is no need to form the cylinder 41 from a high-grade stainless steel material or to perform a stainless steel treatment such as painting, so that the number of processing steps for the stainless steel treatment can be reduced and the cost can be reduced.

Since the outer surface of the cylinder 41 is made rust and does not rust as described above, even when the cylinder 41 repeatedly slides on the seal member 35 of the cylinder guide 34 provided on the housing 31 in the trim operation area, the cylinder 41 is not rusted.
Does not scratch the seal member 35.

The tank 28C of the hydraulic oil supply / discharge device 22
The entirety of the cylinder 41 protruding outward from the housing 31 is covered by the entire area of the cylinder 41 in the longitudinal direction.
For this reason, the tank 28C extends along the longitudinal direction of the cylinder 41, and does not protrude laterally and outward around the base of the cylinder 41, so that the trim and tilt device 20 can be made compact.

Here, the housing 3 of the cylinder device 21
Reference numeral 1 denotes an aluminum alloy casting in which the tank 25 of the hydraulic oil supply / discharge device 22 is integrally formed, and does not rust. The sub tank housing 28 is made of, for example, resin and does not rust.

Incidentally, the outer peripheral surface of the cylinder 41 may be subjected to a treatment such as plating to improve the slidability of the housing 31 with respect to the cylinder guide 34.

According to the present embodiment, the following operation is also obtained. Since the first trim chamber 32 </ b> A and the first tilt chamber 42 </ b> A are communicated with each other through the communication passage 46 provided in the wall of the cylinder 41, the piping for the hydraulic oil supplied and discharged from the hydraulic oil supply / discharge device 22 to the cylinder device 21 is reduced. Exposure to the outside of the cylinder device 21 can be suppressed. Thus, the appearance of the cylinder device 21 is compact, and there is no fear of damage to the exposed piping or oil leakage from the connection portion. At this time, since the communication passage 46 between the first trim chamber 32A and the first tilt chamber 42A is provided in the wall of the cylinder 41, the configuration of the cylinder device 21 is simple.

The required portion of the cylinder device 21 for the liquid-tight seal is a sliding portion (seal member 35) of the cylinder 41 with respect to the cylinder guide 34 provided in the housing 31, and a trim piston 51 with respect to the inner surface of the trim chamber 31 of the housing 31.
, The sliding portion of the piston rod 61 with respect to the rod guide portion 43 provided on the cylinder 41 (the sealing member 44), and the sliding portion of the tilt piston 71 with the inner surface of the tilt chamber 42 of the cylinder 41 (the seal). Member 7
There are only four locations of 2), and the sealing performance of the cylinder device 21 can be improved.

The tilt piston 71 moves up and down only by sliding the outer peripheral portion against the inner surface of the tilt chamber 42 of the cylinder 41 during the tilt operation. The tilt piston 71 has good assemblability and slidability, and can improve the tilt operation. .

By forming the cylinder 41 of the cylinder device 21 into a double cylinder structure, the inner pipe 41A and the outer pipe 4
1B, this double cylindrical structure is formed, and the gap between the two pipes 41A, 41B can be used as a communication path 46 between the first trim chamber 32A and the first tilt chamber 42A. Thereby, the configuration of the cylinder device 21 can be extremely simplified.

The pump 24, the tank 25, and the switching valve-equipped flow path 26 of the hydraulic oil supply / discharge device 22 are built in the housing 31 of the cylinder device 21 so that the hydraulic oil supply / discharge device 2
The communication flow path between the cylinder 2 and the cylinder device 21 is not exposed to the outside, and in combination with the above, all the exposed piping of the trim / tilt device 20 can be eliminated.

The hydraulic oil supply / discharge device 22 is connected to the cylinder device 21
By simply connecting the housing 31 of the cylinder device 21 and the piston rod 61 to the hull 11 and the marine propulsion device 10, the mounting of the hydraulic oil supply / discharge device 22 is completed at the same time.

According to the present invention, however, the communication passage built in the wall of the cylinder and communicating the first trim chamber and the first tilt chamber is replaced with a hole-shaped communication passage provided in the thickness of the cylinder. It may be constituted by. At this time, the cylinder may be formed by casting, and the hole-shaped communication passage may be cast, or the cylinder may be formed by a pipe, and the hole-shaped communication passage may be formed in the thickness of the pipe. May be.

Second Embodiment (FIGS. 7 and 8) The second embodiment differs from the first embodiment in that a housing 31 is formed in a cylinder block 201 of a cylinder device 21 as shown in FIG. That is, the pump 24 is fixed to the pump housing 202 of the hydraulic oil supply / discharge device 22, the pump housing 202 is formed separately from the cylinder block 201, and both are integrally connected by bolts 203 (FIG. 7). The cylinder block 201 can be made of, for example, an aluminum alloy casting, and the pump housing 202 can be made of, for example, an aluminum alloy casting or a resin such as an engineering plastic.

At this time, as shown in FIG. 7, the hydraulic oil supply / discharge device 22 mounts the mounting base 23A of the motor 23 on the motor mounting surface 202A formed on the pump housing 202, fixes the mounting base 23A with the bolt 27, and fixes the motor 23 to the cylinder. It is juxtaposed beside the housing 31 of the device 21.

The hydraulic oil supply / discharge device 22 stores the hydraulic oil in the pump housing 202 using the hollow portion formed on the side of the housing 31 as the tank 25. In the tank 25 provided in the pump housing 202, an opening 25A (not shown) is provided in a portion corresponding to a lower portion of the motor 23, and the fitting portion 23B ( (Not shown) is hermetically fitted via a seal member 25B (not shown) such as an O-ring. A pump 24 (not shown) is fixedly disposed under the motor 23 in a tank 25 provided in the pump housing 202 in a state of being immersed in oil.
An output shaft 23C (not shown) projecting from the third fitting portion 23B and a driven shaft 24A (not shown) of the pump 24 are connected.

In the hydraulic oil supply / discharge device 22, the sub-tank 28C formed by the sub-tank housing 28 is passed through a communication port 204 provided in the sub-tank housing 28 to the side wall of the pump housing 202 in a liquid-tight manner via an O-ring or the like. This allows the pump housing 202 to communicate with the tank 25 described above.

The second embodiment differs from the first embodiment in the following points (FIG. 8). (a) The free piston 81 has a reset check valve 82 (FIGS. 7 and 8). When an external force in the direction of extension of the cylinder device 21 is applied for any reason at the time of a collision with an obstacle during forward movement of the marine propulsion device 10, a brake operation during forward movement, or a start operation, the extension side buffer valve 73 is opened. The piston rod 61 extends and the oil transferred from the first tilt chamber 42A to the second tilt chambers 42B and 42C
1 and the free piston 81, when the free piston 81 is at the lowest point, when the piston is moved forward while compressing the piston rod 61 by the pump operation, the reset check valve 82 is opened. Tilt piston 71
And the free piston 81 is reset to the original position where it contacts.

(B) In the marine propulsion device 10, an external force acting in the direction in which the cylinder device 21 extends, such as the force of lifting the propulsion unit 15 due to the reverse thrust or wave force during backward cruising, acts. In order to avoid the disadvantage that the cylinder device 21 is tilted up before the trim up operation when the cylinder device 21 is extended (up), the check valve 121 and the relief valve 21 It has a valve 122. That is, the hydraulic oil supply / discharge device 22 is connected to the first trim chamber 3.
2A and the first tilt chamber 42A connected to the pump 24
The first trim chamber 32 </ b> A is connected to the first trim chamber 32 </ b> A
A check valve 121 that allows the flow of hydraulic oil to the tilt chamber 42A and a relief valve 122 that opens on the condition that the hydraulic pressure of the first trim chamber 32A and the hydraulic pressure of the first tilt chamber 42A have increased to a certain value or more are arranged in parallel. Connected. Accordingly, even when an external force in the direction in which the cylinder device 21 is extended, such as a reverse thrust during backward running or a force of a wave that lifts the propulsion unit 15, is applied to the cylinder device 21. After the trim-up movement of the trim piston 51 is completed, the tilt piston 71 can be extended so as to start the tilt-up movement.

(C) The marine propulsion device 10 stops the pump 24 of the trim / tilt device 20 in the trim operable range (the state in which the cylinder device 21 has not been completely trimmed up) during forward cruising, and In a state where the hydraulic passages 91 and 92 to the cylinder device 21 by the supply / discharge device 22 are locked, an underwater obstacle such as a driftwood collides with the propulsion unit 15,
The hydraulic oil supply / discharge device 22 has a relief valve 131 to avoid abnormal pressurization of the tank 25 due to the piston rod 61 and the cylinder 41 integrally performing a trim stroke with respect to the housings 28 and 31 and the tank 25. ing. That is, the valve is opened when the hydraulic pressure of the tank 25 is increased to a certain value or more, and the hydraulic oil in the tank 25 is supplied to the second trim chamber 3.
A relief valve 131 that enables relief to the second trim chamber 32B is installed below the motor 23 of the tank 25 on the bottom surface where the pump 24 is fixedly arranged, and the flow path 9 communicating with the second trim chamber 32B is provided.
5 (92). Thereby, abnormal pressurization of the tank 25 due to movement (trim stroke) of the cylinder 41 due to impact of an underwater obstacle or the like on the propulsion unit 15 and application of an impact force in a direction to extend the cylinder device 21 can be avoided. And

Therefore, according to the present embodiment, the following operations are provided. By integrating the cylinder block 201 and the pump housing 202 by bolting, the piping of the trim / tilt device 20 is stored, and the overall size and installation space are reduced, while both are molded separately. The molding of the pump housing 202 is facilitated,
Formability and workability can be improved. Also, the housing 31,
The combination of the capacity and length of the cylinder 41 and the capacity of the pump 24 can be variously changed, and the compatibility with various marine propulsion machines can be improved. Further, when the trim / tilt device 20 fails, etc., the cylinder block 201 and the pump housing 202
It is sufficient to replace one of them, and the maintenance is good.

The cylinder block 201 to which the impact force is applied when the trim / tilt device 20 is raised or lowered is made of aluminum to secure the strength.
2 is made separate from the cylinder block 201 and made of resin, etc.
Improved workability can be realized.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and the design can be changed without departing from the scope of the present invention. The present invention is also included in the present invention.

[0074]

As described above, according to the present invention, the cylinder constituting the tilt device can be easily and reliably made stainless steel by reducing the number of processing steps, and the tilt device can be made compact.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a marine propulsion device according to a first embodiment.

FIG. 2 is a schematic view showing a trim / tilt device.

FIG. 3 is a side view of FIG. 2;

FIG. 4 is a plan view of FIG. 2;

FIG. 5 is a schematic view showing a state in which a hydraulic oil supply / discharge device is incorporated into a housing of a cylinder device.

FIG. 6 is a schematic diagram showing a hydraulic circuit of the trim / tilt device.

FIG. 7 is a schematic view showing a trim / tilt device according to a second embodiment.

FIG. 8 is a schematic diagram showing a hydraulic circuit of the trim / tilt device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Ship propulsion machine 11 Hull 15 Propulsion unit (ship propulsion machine) 21 Cylinder device 22 Hydraulic oil supply / discharge device 23 Motor 24 Pump 25 Tank 26 Flow passage with switching valve 28 Subtank housing 28C Subtank 31 Housing 32 Trim room 32A First trim room 32B Second trim chamber 41 Cylinder 42 Tilt chamber 42A First tilt chamber 42B Second tilt chamber 46 Communication path 51 Trim piston 53 Communication path 61 Piston rod 71 Tilt piston 201 Cylinder block 202 Pump housing 203 Bolt

Claims (4)

[Claims] A cylinder device is interposed between a hull and a marine vessel propulsion device which is tiltably supported on the hull, and supply or discharge of hydraulic oil from a hydraulic oil supply / discharge device to the cylinder device is controlled. A tilt device for a marine propulsion device that tilts a marine propulsion device by expanding and contracting a cylinder device, wherein the cylinder device is used by being connected to one of a hull and a marine propulsion device and to the other. A tilt device for a marine propulsion device, comprising: a piston rod; and a cylinder of the cylinder device covered by a tank constituting a hydraulic oil supply / discharge device. 2. The cylinder device forms the cylinder in a cylinder block, the hydraulic oil supply / discharge device fixes a pump to a pump housing, and the pump housing is formed separately from the cylinder block and bolted. The tilt device for a marine propulsion device according to claim 1, wherein 3. A cylinder device is interposed between a hull and a marine vessel propulsion device which is supported to be tiltable on the hull, and supply or discharge of hydraulic oil from a hydraulic oil supply / discharge device to the cylinder device is controlled. A trim / tilt device for a marine propulsion device for extending and contracting a cylinder device to perform a trim operation and a tilt operation of a marine propulsion device, wherein the cylinder device is used in connection with one of a hull and a marine propulsion device. A housing that forms a chamber; a cylinder that is telescopically inserted into a trim chamber of the housing to form a small-diameter tilt chamber; and a first trim that is fixed to a cylinder end in the trim chamber of the housing, and that connects the trim chamber to the cylinder housing side. A large-diameter trim piston partitioned into a chamber and a second trim chamber on the non-cylinder side, and used in connection with the other of the hull and the marine propulsion unit. A piston rod inserted into the tilt chamber so as to be extendable and retractable; a first tilt chamber fixed to the piston rod end in the tilt chamber of the cylinder; A small-diameter tilt piston partitioned into a cylinder and a portion of the cylinder device that protrudes outward from the housing in a trim operation range by a tank constituting a hydraulic oil supply / discharge device. Trim and tilt device for propulsion. 4. The cylinder device forms the housing in a cylinder block, the hydraulic oil supply / discharge device fixes a pump to the pump housing, and the pump housing is formed separately from the cylinder block and bolted. The trim / tilt device for a marine propulsion device according to claim 1.