JPH0659873B2 - Tilt lock device for outboard motor - Google Patents

Description

The present invention relates to a tilt lock device for an outboard motor.

(Prior Art) As prior art, there are, for example, JP-A-51-131091 and JP-A-51-131092.

In the above, the first of the fluid pressure actuated cylinders 33 for tilting is
19 which is a communication path between the end portion 37 of the
Although a manually operable valve 199 is arranged at 7, when the tilt down operation or the tilt up operation is manually performed, the liquid that flows out from the tilting fluid pressure operation cylinder 33 as a surplus due to the entry and exit of the rod is sump 71. Or a conduit serving as a passage for supplying the liquid from the sump 71 to the tilting fluid pressure actuated cylinder 33 as a shortage is a conduit from the first end to the sump via the one-way valve 191 and the sump 71. From the one-way valve 179 to the second end 39 via the conduit 115.

Then, when the valve 190 is opened and the tilt-down operation is manually performed, the liquid that flows out from the tilting fluid pressure operating cylinder 33 as an excess due to the entry of the rod needs to pass through the one-way valve 191 and be stored in the sump. is there. That is, the one-way valve 191 needs to have a valve opening pressure that is opened by a manual tilt-down operation. On the other hand, if the tilt-up operation is performed manually, the liquid that runs short due to the rod leaving the
It is supplied from the sump 71 to the tilting fluid pressure operated cylinder 33 via the one-way valve 179 and the conduit 115.

However, when the tilt-down operation is manually performed with the valve opened, the liquid moves from the first end portion 37 to the sump 71 via the overload valve 191, while the one-way valve 179 from the sump 71, Second end 39 via conduit 115
The liquid is supplied to the device, and tilt down is performed.

That is, there is a problem that the movement of the piston is limited to a small amount even by the thrust generated by the rotation of the propeller during reverse travel, and the outboard motor cannot be held so that the posture of the outboard motor does not change significantly from the locked state.

On the other hand, in Japanese Patent Application Laid-Open No. 51-131092, the first reservoir 51 and the second reservoir 55 are connected to the fluid pressure actuated cylinder piston assembly 31 via a hydraulic circuit, and the first valve 73 and the first valve 73 are connected. In the state where both valves of the third valve 77 are open and the valve is tilted up and down, only the tilt-up operation can be performed because of the one-way valves 95 and 119, and the working liquid moves from the second chamber to the second reservoir 55. On the other hand, the working liquid moves from the first reservoir 51 to the first chamber. That is, at least the first reservoir 5
No. 1 requires a volume that can supply the working liquid of the entire volume of the first chamber with the movement of the piston, and the second reservoir 55 has a volume of all the volumes of the second chamber with the movement of the piston. It needs a volume that can accept the working liquid.

Further, when the valve of the second valve 75 is in the fixed position descent, only the tilt-down operation can be performed because of the one-way valve 179, and the working liquid moves from the first chamber to the first reservoir 51,
The working liquid moves from the second reservoir 55 to the second chamber. That is, at least the first storage portion 51 needs to have a volume capable of receiving the working liquid of the entire volume of the first chamber as the piston moves, and the second storage portion 55.
Has a problem in that the volume of the working liquid in the entire second chamber needs to be supplied with the movement of the piston.

(Problems to be Solved by the Invention) The present invention has been made in view of the above circumstances, and a problem thereof is to reduce a manual tilt-up load and generate thrust with rotation of a propeller during forward or reverse travel. Also by this, the movement of the piston is limited to a small amount, the outboard motor can be held so that the posture does not greatly change from the hooked state, and the gas cylinder is made compact.

In addition, it is to prevent the outboard motor from being damaged when the outboard motor collides with an obstacle such as driftwood during traveling.

Still another object is to simplify the structure of the tilt lock device and allow the outboard motor to be swung up quickly.

(Means for Solving the Problems) In order to solve the above-mentioned problems, a tilt lock device for an outboard motor according to the present invention has a clamp bracket that is hooked on a hull and is mounted and supported by an outboard motor body. A cylinder that is rotatably supported by one of a swivel bracket that is pivotally supported up and down with respect to the clamp bracket and that contains the working liquid, and the remaining bracket that is inserted into and retracted from this cylinder A rod rotatably supported on one side, and a first chamber connected to an inner end of the rod and slidably fitted in a cylinder to expand in the cylinder when an external force in a retreating direction acts on the rod. And a piston that is divided into two chambers, that is, a second chamber that is compressed, and a communication passage that communicates between the first chamber and the second chamber.
A valve mechanism for switching and selecting a state in which movement of the working liquid between the first chamber and the second chamber in both directions is blocked and a state in which movement of the working liquid is allowed in both directions, and a first chamber provided in the communication passage. A check valve that prevents movement of the working liquid between the second chamber and opens when the pressure in the second chamber rises above a predetermined level, and stores the gas and the working liquid in two layers. A gas cylinder is provided separately from the cylinder, and the other end of the connecting pipe, one end of which opens into the working liquid of the gas cylinder, is connected to the other end of the working liquid storage portion including the first chamber, the second chamber and the communication passage. Inside, either the first chamber side or the second chamber side, which is partitioned by the valve mechanism, is opened.

According to a second aspect of the present invention, there is provided a tilt lock device for an outboard motor, comprising: a valve body that is seated on a valve seat and opens toward the first chamber; and a valve body that is supported by pressing the valve body in a seating direction with a predetermined pressure. And second
When the pressure in the chamber rises above a predetermined level, the check valve is composed of a valve support body that passively retracts the valve body in the valve opening direction by the pressure, and the valve body of this check valve is An operating member for switching the valve to open it is provided, and the operating member and the check valve constitute a valve mechanism.

In the tilt lock device for an outboard motor according to a third aspect of the present invention, the communication passage is formed of a plurality of communication passages, and one of the communication passages is provided in the piston, and the communication passage provided in the piston is non-returned. It is provided with a valve.

(Example) An example of the present invention will be described with reference to the drawings. In FIG. 1, (A) is a hull, (B) is an outboard motor, (b) is an outboard motor body, and (1) is a propeller.

The outboard motor body (b) is composed of an upper casing (b ₁ ) and a lower casing (b ₂ ), and the upper casing (b ₁ ) is a hull with a clamp bracket (2) and a swivel bracket (3). It is attached and supported by (A).

The two brackets (2) and (3) are shown enlarged in FIGS. 2 and 3.

The clamp bracket (2) is fitted to the upper end of the stern (a) of the hull (A) and is fixed so as to hold it from inside and outside.

Reference numeral (4) is an insertion hole formed in the lower portion of the clamp bracket (2) at a front and rear interval with a plurality of openings, and the pins (5) are selectively inserted.

On the other hand, the upper end of the swivel bracket (3) is rotatably supported on the upper part of the clamp bracket (2) so that the swivel bracket (3) is loosely fitted inside the bracket (2) and the rear edge of the outboard motor body (b) is attached. The upper casing (b ₁ ) is attached and fixed.

Therefore, the outboard motor (B) is vertically rotatable about the pivotal fulcrum of the swivel bracket (3).

(6) is a locking portion formed by cutting out at the lower front edge of the swivel bracket (3), and the swivel bracket (3) is locked to the pin (5) via the locking portion (6), Rotation toward the front, that is, the hull (A) side is restricted.

Therefore, even when the outboard motor (B) tries to move to the hull (A) side by its thrust when moving forward, the movement is restricted by the swivel bracket (3) being locked by the pin (5).

In addition, the engagement position of the swivel bracket (3) is changed by replacing the pin (5) with another insertion hole (4), and accordingly, the mounting angle of the outboard motor (B) is changed.

Reference numeral (7) is a locking lever pivotally supported on the upper part of the swivel bracket (3) and bent in an L shape.

The lower end of the locking lever (7) is engaged with the upper edge of the clamp bracket (2) when the swivel bracket (3) is rotated upward as the outboard motor (B) is pulled up, and the swivel bracket (3) is rotated. ) Is retained so that the outboard motor (B) is held in the raised state.

Reference numeral (8) is a cylinder rotatably attached to and supported by one of the brackets (2) and (3), for example, a swivel bracket (3), in which a rod (11) and a piston (12) are fitted and inserted. Is enlarged and shown in FIG.

The cylinder (8) contains oil (9) as a working liquid therein.

The rod (11) is inserted into and retracted from the cylinder (8), and its outer end is rotatably attached to and supported by the remaining one of the brackets (2) and (3), that is, the clamp bracket (2). .

The piston (12) is connected to the inner end of the rod (11) and slidably fitted in the cylinder (8), and the two chambers in the cylinder (8), namely the first chamber (8a) and the second chamber (8b). ), And oil (9) is stored in each of the first chamber (8a) and the second chamber (8b).

(13) and (14) are communication passages that are formed in the piston (12) and connect the first chamber (8a) and the second chamber (8b).

(15) and (16) are check valves provided in the communication passages (13) and (14) to allow only one-way flow of the oil (9) in each of the communication passages (13) and (14). It has become.

On the other hand, in FIG. 4, the check valve (15) on the left side is the second chamber.
When the pressure in (8b) rises above a certain level, it opens to allow the oil (9) to flow from the chamber (8b) to the first chamber (8a). It consists of a valve seat (17) formed and a spherical valve body (29) corresponding to it.

Reference numeral (19) is a spring for biasing the valve body (18) in the valve closing direction via the support member (20), and the spring has a second force than the spring force of the spring (19).
When the pressure in the chamber (8b) rises, the valve body (18) opens and the check valve
(15) is designed to be opened.

The remaining one, that is, the check valve (16) on the right side in FIG. 4 is the first chamber.
The oil (9) is allowed to flow from the (8a) to the second chamber (8b) and is composed of a valve seat (21) and a valve body (22) like the check valve (15). .

(23) is a spring that holds the valve body (22) in a closed state,
The spring force is set weaker than that of the spring (19).

(24) is a pipe-shaped communication passage that bypasses the piston (12) and connects the first chamber (8a) and the second chamber (8b), and at the lower portion thereof, the second passage via the small passage (25). It communicates with the chamber (8b), and also communicates with the first chamber (8a) through the small passage (26) at the upper part.

As shown in FIGS. 5 and 6, a switching valve (37) constituting a valve mechanism for opening and closing the communication passage (24) in the middle of the communication passage (24).
The switching valve (37) is provided with two first and second valve chambers (39) and (40) and valve seats (41) () provided in the respective valve chambers (39) (40). It is provided with two valve bodies (43) (44) corresponding to 42).

The first valve chamber (39) communicates with the second chamber (8b) in the cylinder (8), and the second valve chamber (40) constitutes a gas chamber (38) and a gas cylinder (45) and a cylinder. It communicates with the first chamber (8a) in (8).

The valve bodies (43) and (44) are connected via a connecting member (46), and the valve body (44) of the second valve chamber (40) is closed by springs (47) elastically mounted on its back. It is supported in a biased state.

The spring force of the spring (47) is set to be equal to or greater than that of the spring (19) of the check valve (15).

The valve body (44) prevents the oil (9) from moving from the first chamber (8a) to the second chamber (8b), and within the range of the spring force of the spring (47), the second chamber (8b). ) To prevent the oil (9) from moving from the first chamber (8a). Then, when the pressure in the second chamber (8b) rises above a predetermined level, it is compressed by the pressure and the first chamber
It retreats to the (8a) side and opens the valve element (44) to allow the movement of the oil (9) from the second chamber (8b) to the first chamber (8a).

That is, the valve body (44) is similar to the check valve (15) in the first chamber.
A check valve that prevents the movement of the oil (9) between the (8a) and the second chamber (8b) and that opens when the pressure in the second chamber (8b) rises above a predetermined level is formed. There is.

Reference numeral (48) denotes an operation shaft that is a switching operation member that faces the first valve chamber (39) so as to move back and forth. The operation shaft constitutes a valve mechanism together with the valve body (44) serving as a check valve, and the valve body (43 ) Push (44) to open the valve.

On the other hand, the gas cylinder (45) forming the gas chamber (38) is provided separately from the cylinder (8) and is partitioned by the partition wall (45a) slidably fitted in the cylinder (45). Then
On the other hand, in the gas chamber (38), an inert gas (1
(0) is enclosed and the other (9) is accommodated, and the oil (9) is communicated with the valve chamber (40) of the switching valve (37) through the communication pipe (45b), thereby making The cylinder (45) communicates with the first chamber (8a) of the cylinder (8). The partition wall (45a) described above does not necessarily have to be provided, and when the partition wall (45a) is not provided, the oil (9) and the inert gas (10) are naturally separated.

When the cylinder (8) and the gas cylinder (45) are separately provided as described above, the clamp bracket (2) and the swivel bracket (3) are compared with, for example, a case where the gas cylinder is integrally connected to one end of the cylinder. There is an advantage that the length of the cylinder (8), which is restricted to be installed within a narrow range between and, can be shortened and downsized.

The gas cylinder (45) separated from the cylinder (8) is fixed so as to be along one side of the cylinder (8) so as not to interfere with the brackets (2) and (3), for example.

As described above, in the present embodiment, the two communication passages (13) (24) that communicate between the first chamber (8a) and the second chamber (8b) are provided,
Each block the movement of oil (9) between the first chamber (8a) and the second chamber (8b) in both directions, and open the valve when the pressure in the second chamber (8b) rises above a certain level. From the second chamber (8b) to the first chamber (8
Check valves (15) (44) are provided to allow oil to flow to a).

The operation of such a tilt lock device is shown in FIGS. 7 to 11.

First, FIG. 7 shows the case where the outboard motor (B) is kept in the hooked state during normal traveling.

In this case, the rod (11) enters the cylinder (8) to the maximum extent, the piston (12) is positioned above, the first chamber (8a) is fitted, and the switching valve (37) is closed.

In this state, the inert gas in the gas cylinder (45) which communicates with the first chamber (8a) is compressed and compensates for the increase in volume accompanying the entry of the rod (11).

That is, the gas cylinder (45) does not have to accommodate all the oil discharged from the first chamber (8a) as the piston (12) moves, and the rod (11) that simply enters the cylinder (8). Since it is sufficient to absorb only the oil corresponding to the volume of, it can be made compact.

Then, in such a state, when the thrusting force at the time of reverse travel acts on the outboard motor (B) so as to flip it up, the rod (11) tries to retract from the cylinder (8) and the second chamber
Although the pressure in (8b) increases, the check valve (15) does not open and the communication passage (24) is closed at this level of pressure increase, so the oil (9) in the second chamber (8b) is It does not flow into the first chamber (8a).

Therefore, the withdrawal of the rod (11) is restricted, and the locked state of the outboard motor (B) is maintained.

Similarly, the outboard motor (B) is not flipped up even during deceleration or braking which is performed during normal traveling, and the hooked state is maintained.

Next, FIG. 8 and FIG. 9 show the case where the hooked state of the outboard motor (B) is released when traveling in shallow water or landing.

In this case, the switching valve (37) is opened and the communication passage (24) is opened.

Therefore, when the tilt-up operation for pulling up the outboard motor (B) is performed, the rod (11) withdraws from the cylinder (8), the piston (12) is displaced downward, and the second chamber (8b) is accordingly displaced. The oil (9) in the chamber (8b) that has been reduced is passed through the communication passage (24) to the first chamber.
It flows into (8a).

Before the tilt-up operation, the own weight of the outboard motor (B) pushes up the piston (12) to the first chamber side via the rod (11), and the inside of the gas cylinder (45) communicating with the first chamber (8a). It is in a state of compressing the inert gas (10). Then, when the outboard motor (B) is pulled up by the tilt-up operation as described above,
The repulsive force due to the compressed inert gas (10) is
The pressure in (a) is increased to work in the direction of retracting the rod (11), thereby reducing the load when pulling out the outboard motor (B) itself, and the tilt-up operation can be performed easily by that amount.

Further, when the tilt-up operation is performed and the rod (11) withdraws from the cylinder (8), the inert gas (10) expands by the amount of the withdrawal volume to compensate for the decrease in volume.

When the switching valve (37) is closed and the outboard motor (B) is released in the state shown in FIG. 8, the communication passage (24) is closed, so that the oil (9) does not flow from there. The force of the approaching direction acts on the rod (11) by the own weight of the outboard motor (B), and the pressure in the first chamber (8a) rises.

Then, due to the pressure increase in the first chamber (8a), the check valve (16)
Is opened, the oil (9) in the first chamber (8a) flows into the second chamber (8b), and the rod (11) enters the cylinder (8).

Therefore, since the outboard motor (B) will rotate downwards as it is, the locking lever (7) is attached to the clamp bracket (2) as described above in order to maintain the pulled-up state of the outboard motor (B). To engage.

When the outboard motor (B) collides with an obstacle, the check valve (15) opens similarly due to the impact as shown in FIG. 6, but the spring of the spring (47) in the switching valve (37) is the same. Power Check Valve (15)
If it is the same as the spring (19), the first chamber (8a) to the second chamber (8)
The valve element (44) that was blocking the movement of oil (9) to b) opens.

That is, the pressure of the second chamber (8b) acts on the first valve chamber (39) communicating with the second chamber (8b) through the communication passageway (24), and the valve body (44) increases as the pressure of the chamber (39) increases. Opens.

Therefore, the oil (9) in the second chamber (8b) is connected to the communication passage of the piston (12).
It flows into the first chamber (8a) through the (13) and the communication passage (24).

Further, when the spring force of the spring (47) is set to be larger than that of the spring (19), the outboard motor (B) received a larger impact than the force for opening the check valve (15). At this time, after the check valve (15) is opened, the switching valve (37) is opened along with the opening of the valve body (44).
The impact can be mitigated in two stages by flowing the oil (9) also from the communication passage (24).

Then, after the impact is released, as shown in Fig. 11, the check valve
Although the valve (15) is closed, the dead weight of the outboard motor (B) acts on the rod (11) in that state to increase the pressure in the first chamber (8a), and the check valve (16) accordingly. Opens and the oil (9) in the first chamber (8a) flows into the second chamber (8b).

As a result, the rod (11) enters the cylinder (8) and the outboard motor (B) returns to the original state shown in FIG.

Further, the outboard motor (B) is detached from the hull (A) as necessary, but at this time, the outboard motor (B) may lie sideways and its posture may change significantly. Then, the switching valve (2
When the valve 7) is opened, the inert gas (10) in the gas cylinder (45) tries to flow into the second chamber (8b) through the connecting pipe (45b). In the embodiment shown in FIG. 5, since the partition wall (45a) is provided in the gas cylinder (45), the inert gas (10) does not flow out.

However, when the partition wall (45a) is not provided in the gas cylinder (45), if the switching valve (37) is opened, the inert gas in the gas cylinder (45) will change as the posture changes. The inert gas (10) enters into the second chamber (8b) through the communication pipe (45b).

Then, when the inert gas (10) enters the second chamber (8b),
Due to the thrust load generated during reverse, the inert gas (10) that has entered the second chamber (8b) is compressed, and the outboard motor (B) jumps up by that amount, making the reverse of the ship extremely unstable. .

However, by closing the switching valve (37) described above, the oil (9) between the gas cylinder (45) and the second chamber (8b) is kept within the spring force of the spring (47). ) Movement can be suppressed. Therefore, even when the outboard motor (B) is removed from the hull (A) as described above, the inert gas (10) in the gas cylinder (45) passes through the communication pipe (45b) into the second chamber. (8b) It is possible to prevent problems that flow into the inside.

As described above, when the outboard motor (B) collides with an obstacle or when the piston (12) is moved forward or backward or in the approaching direction due to an impact when the vehicle suddenly starts, the first chamber of the cylinder (8) is moved.
The inert gas (10) in the gas cylinder (45) communicating with (8a) can be elastically compressed or expanded to alleviate the impact force described above.

On the other hand, the partition wall (4
5a) does not necessarily have to be provided, and the impact mitigation described above can be exerted even if it is not provided. However, when the partition wall (45a) is fitted inside as in the above embodiment, even if the partition wall (45a) is subjected to vibration due to impact force or vibration from the engine or the like, the inert gas (10) remains in the oil (9). ) Can be completely prevented by the partition wall (45a), so that the impact relaxation characteristics described above can be made very stable.

(Effects of the Invention) Since the tilt lock device for an outboard motor according to the present invention is configured as described above, it has the following effects.

1. A gas cylinder for storing the working gas is provided separately from the cylinder, and is arranged so as to communicate with the working liquid storage portion including the cylinder and the communication passage, so that the working liquid storage is provided when the outboard motor body is tilted down manually. From the gas cylinder to the gas cylinder, energy is stored by compressing the working gas in the gas cylinder, and when the tilt-up operation of the outboard motor body is manually performed, the gas cylinder moves to the working liquid container. The movement of the working liquid is allowed, the energy of the working gas is transmitted to the piston through the working liquid, and the tilt-up load can be reduced.

2. A gas cylinder that stores gas and the working liquid in two layers is provided separately from the cylinder, and the other end of the connecting pipe whose one end opens into the working liquid of the gas cylinder is connected to the first chamber and the first chamber. By opening the working liquid storage portion including the two chambers and the communication passage on one of the first chamber side and the second chamber side that are defined by the valve mechanism as a boundary, the gas cylinder is provided. Even if the valve mechanism is in the closed state, the first chamber side and the second chamber side do not communicate with each other, and the valve mechanism is in the closed state so that the working liquid in both directions can flow between the first chamber and the second chamber. By blocking the movement, the movement of the piston is limited to a small amount even by the thrust generated by the rotation of the propeller during forward or reverse movement, and the outboard motor is held so that the posture does not change significantly from the locked state. You can

3. When the valve mechanism is opened and the working fluid is allowed to move in both directions between the first chamber and the second chamber, the first chamber, the second chamber, and the gas cylinder communicate with each other, so that when the tilt-down operation is performed, the first chamber When the working liquid moves from the chamber to the second chamber, and the working liquid accommodation volume that sums up the first chamber and the second chamber at this time, the decrease due to the rod entering the cylinder (the volume of the rod entry portion). ) Only working liquid moves to the gas cylinder. On the contrary, when the tilt-up operation is performed, the working liquid corresponding to the volume of the entry portion of the rod is supplied to the working liquid storage portion. That is, the volume of the working liquid flowing in and out of the gas cylinder can be reduced, and the gas cylinder can be made compact accordingly.

4. It is arranged in a communication passage that communicates between the first chamber and the second chamber to prevent movement of the working liquid between the first chamber and the second chamber, and the pressure in the second chamber rises above a predetermined level. Since a check valve that opens at times is provided, when the outboard motor collides with an obstacle such as driftwood and the pressure in the second chamber rises sharply, the working fluid in the second chamber flows from the check valve to the first valve. You can escape to the room,
As a result, the outboard motor can be repelled and the impact force at that time can be mitigated.

In the tilt lock device of the second aspect, by operating the operation member during the tilt-up operation, the working liquid in the second chamber can be released toward the first chamber, and the tilt-up load can be reduced. Further, since the operation member switches the check valve provided in the communication passage, the check valve can be used not only when the outboard motor collides with driftwood but also when tilting up by the driver's intention. Can be operated as a valve that switches the communication state between the second chamber and the second chamber, and the structure is simplified.

In the tilt lock device according to claim 3, since the communication passage is constituted by a plurality of communication passages and the check valve is arranged in the communication passage provided in the piston, the working liquid from the second chamber to the first chamber is prevented. Inflow, that is, splashing of the outboard motor can be performed quickly.

[Brief description of drawings]

FIG. 1 is a side view showing the device of the present invention, FIGS. 2 and 3 are enlarged side views of the device, FIG. 4 is an enlarged sectional view of a cylinder, and FIGS. 5 and 6 are schematic views of the device. 7 to 11 are explanatory views of the operation of the apparatus. In the figure, (B) ... outboard motor, (b) ... outboard motor body (A) ... hull (2) ... clamp bracket (3) ... swivel bracket (8) ... cylinder, (8a) ... first chamber ( 8b) ... second chamber, (9) ... oil (working liquid) (10) ... inert gas (working gas) (11) ... rod, (12) ... piston (13) ... passage (communication passage) (15) (16) ... Check valve, (24) ... Communication passage (37) ... Switching valve (valve mechanism), (44) ... Valve body (check valve) (45) ... Gas cylinder (45a) ... Section wall (Section) Member) (47)… spring (valve support member) (48)… operation shaft (operation member)

Claims (3)

[Claims] 1. A rotatably supported one of a clamp bracket to be hooked on a hull and an outboard motor main body to be mounted and supported, and a swivel bracket rotatably supported vertically with respect to the clamp bracket. A cylinder containing a working fluid, a rod inserted into and retracted from the cylinder and rotatably supported by the remaining one of the brackets, and slidable on the cylinder connected to the inner end of the rod. A second chamber that is compressed in the opposite direction of the first chamber that expands when an external force in the retreating direction acts on the rod in the cylinder.
And a piston which is divided into two chambers, a chamber and a communication passage which communicates between the first chamber and the second chamber, and which is provided in both directions of the working liquid between the first chamber and the second chamber. A valve mechanism for switching and selecting between a state in which movement is blocked and a state in which movement in both directions is permitted, and a valve mechanism that is disposed in the communication passage to block movement of the working liquid between the first chamber and the second chamber. A check valve that opens when the pressure between the two chambers rises above a predetermined level, and a gas cylinder that stores the gas and the working liquid in two layers is provided separately from the cylinder, and one end thereof is the above-mentioned. The other end of the communication pipe that opens into the working liquid of the gas cylinder is the first chamber side that is defined by the valve mechanism as a boundary in the working liquid storage portion that includes the first chamber, the second chamber, and the communication passage. And a tilt lock device for an outboard motor, which is opened to either one of the second chamber side and the second chamber side. 2. A valve body which is seated on a valve seat and opens toward the first chamber side, and the valve body is supported while being pressed in a seating direction with a predetermined pressure, and the pressure of the second chamber is predetermined. When the pressure rises above, a check valve is formed with the valve support that passively retracts the valve element in the valve opening direction, and the valve element of this check valve is moved to the valve opening side. The tilt lock device for an outboard motor according to claim 1, wherein an operating member for performing switching operation is provided, and the operating member and the check valve constitute a valve mechanism. 3. The communication passage comprises a plurality of communication passages, one of which is provided in the piston, and a check valve is provided in the communication passage provided in the piston. A tilt lock device for an outboard motor according to claim 1.