JPH02290795A - Tilt lock device for outboard motor - Google Patents

Abstract

PURPOSE:To allow a propulsion unit to jump an obstruction at the time of collision thereto in a shock-absorbing manner by providing a shock-absorbing means, compensating means and intercommunicating means on a cylinder device interposed between a supporting bracket on a hull side and an universal bracket on the propulsion unit side. CONSTITUTION:A cylinder 8 interposed between a clamp bracket 2 on a hull side and a swivel bracket 3 on a propulsion unit side is partitioned into two chambers 8a, 8b by a piston 12, integrated with a rod 11, which is slidably inserted in a cylinder main body. The piston 12 has a check valve or a relief valve comprising such a shock absorbing means that is opened when a pressure in the chamber 8b is raised up at a predetermined value or more, and also a check valve 16 as an intercommunicating means for allowing oil 9 to flow from the chamber 8a to the chamber 8b. Besides, there is provided an intercommunicating passage 24 for intercommunicating between the chambers 8a, 8b while bypassing the piston 12. In the mid way of the intercommunicating passage 24, there is interposed a selecting valve 37 through which the chamber 8a is connected with a gas cylinder or compensating means 45.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a tilt lock device for an outboard motor.

(Prior art) An outboard motor tilt lock device installed between a clamp bracket and a swivel bracket that pivotally supports the outboard motor with respect to the hull so that it can move up and down freely satisfies the following basic functions. There is a need.

That is, first of all, the outboard motor must be kept in a locked state so that it does not jump up due to the thrust generated by the rotation of the propeller when going in reverse.

Second, the outboard motor must be kept in a locked state during deceleration or braking to prevent it from jumping up due to water resistance.

Third, when the outboard motor collides with an obstacle such as driftwood while traveling, the latching state is automatically released so that the outboard motor can be displaced and damage can be prevented.

Fourthly, when performing a so-called tilt-up operation to raise the outboard motor for running in shallow water or landing, the latched state can be released.

However, conventional tilt lock devices use many links and springs in order to satisfy the above basic functions, and are also equipped with a large number of latching mechanisms, which unnecessarily increases the number of parts, making the structure complicated and large. was inviting.

(Problems to be Solved by the Invention) The present invention has been made in view of the above circumstances, and its object is to provide the basic functions of the above-mentioned tilt lock device with a small and simple configuration.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the tilt lock device of the present invention supports a support bracket and a propulsion unit that are attached to the hull, and pivots freely up and down relative to the support bracket. a cylinder that is rotatably supported on one side of the supporting bracket and accommodates a working fluid; a rod that is inserted into and out of the cylinder and rotatably supported on the remaining one of the brackets; A first member disposed at the inner end of the rod, slidably fitted into the cylinder, and expanding inside the cylinder when an external force in the direction of withdrawal is applied to the rod.
A piston that is divided into two chambers, a second chamber that is compressed in the opposite direction, and a piston that prevents movement of working fluid from the second chamber to the first chamber and when the pressure of the second chamber rises above a predetermined level. a buffer means consisting of a relief valve that opens to allow movement of working fluid from the second chamber to the first chamber and acts as a buffer when the propulsion unit hits an underwater obstacle; and the first and second chambers. and is disposed outside the in-cylinder working fluid storage section, and when the rod is inserted into the cylinder, it accommodates working fluid corresponding to the volume reduction of the in-cylinder working fluid storage section, and causes the rod to withdraw. a compensating means capable of supplying working fluid to the in-cylinder working fluid storage portion corresponding to an increase in the volume of the cylinder working fluid storage portion, and disposed in a communication path between the first chamber and the second chamber, When an external force is applied to the rod in the insertion direction, a tilt-down state is established that allows movement of the working fluid from the first chamber to the second chamber, and at least the backward thrust generated by the propulsion unit is applied to the rod in the withdrawal direction. When an external force is applied, a communication means is provided that can prevent the working fluid from moving from the second chamber to the first chamber.

As a component of the above-mentioned communication means, it is designed to prevent the movement of working fluid from the second chamber to the first chamber during forward sailing, and to enable immediate tilt-down after the propulsion unit jumps up due to the impact during forward sailing. , it is preferable to arrange a check valve that allows movement of the working fluid from the first chamber to the second chamber.

Further, the check valve may be arranged on the piston.

The damping means can be arranged on the piston.

The communication means can also be provided outside the cylinder.

The communication means may allow movement of the working fluid from the second chamber to the first chamber at the same time as it allows movement of the working fluid from the first chamber to the second chamber.

The damping means can also be arranged outside the cylinder.

The check valve may be located on the piston and the second damping means may be located outside the cylinder.

The communication means may also have an opening/closing means that doubles as a buffer means and allows the IJ valve to be opened and closed.

The communication means allows the working fluid to move from the first chamber to the second chamber in the open state, and also allows the working fluid to move from the second chamber to the first chamber, and in the closed state, allows the working fluid to move from the first chamber to the second chamber.
It may be composed of an on-off valve that shuts off the chamber and the second chamber.

(Example) An example of carrying out the present invention will be explained with reference to the drawings. In Fig. 1, (A) is the hull, (B) is the outboard motor, (b) is the outboard motor main body which is the propulsion unit, and (1) is the outboard motor body. It's a propeller.

The outboard motor main body (b) is composed of an upper casing (b1) and a lower casing (b2), and the upper casing (b1) includes a clamp bracket (2) which is a support bracket and a swivel bracket (3) which is a flexible bracket. ) is attached and supported to the hull (A).

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

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

Reference numeral (4) denotes a plurality of insertion holes drilled in the lower part of the clamp bracket (2) at intervals in the front and back, into which the bottles (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), and is loosely fitted inside the bracket (2). The upper casing (b1) is attached and fixed.

Therefore, the outboard motor (B) can freely move up and down about the pivot point of the swivel bracket (3).

(6) is a locking part formed in the lower front edge of the swivel bracket (3), and the swivel bracket (3) is locked to the pin (5) through this locking part (6); Rotation forward, that is, toward the hull (A) side is restricted.

Therefore, when moving forward, the outboard motor (B) uses its thrust to
) side, the above swivel bracket (
3) is locked to the pin (5), thereby restricting its movement.

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

(7) is a locking lever rotatably supported on the upper part of the swivel bracket (3), and is bent into an L-shape.

When the swivel bracket (3) rotates upward as the outboard motor (B) is pulled up, the lower end of this locking lever (7) engages with the upper edge of the clamp bracket (2). ) to keep the outboard motor (B) in the pulled up position.

(8) is a cylinder rotatably mounted and supported on one of the brackets (2) and (3), for example, the swivel bracket (3), into which the rod (I1) and piston (12) are fitted. is shown enlarged in Fig. 4.

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

The rod (l1) is inserted into and out of 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 (l2) is connected to the inner end of the rod (I1) and is slidably fitted into the cylinder (8).
The interior is divided into two chambers, the first chamber (8a) and the second chamber (8b).
b) respectively contain oil (9).

(+3) (+4) is a passage formed in the piston (12), which communicates the two chambers (8a) and (8b).

(15) (I6) is the passage (+3) (14)
It is a check valve installed in each passage (13) (14
), the oil (9) is allowed to flow in only one direction.

One of the check valves (15) on the left in FIG. 4 is a relief valve that is a component of the buffer means of the present invention, and the second
When the pressure in the chamber (8b) rises above a predetermined level, the valve opens to allow oil (9) to flow from the chamber (8b) to the first chamber (8a). The formed valve seat (I
7) and the corresponding spherical valve body (29). ! : It consists of.

(19) is connected to the valve body (l8) via the support member (20).
When the pressure in the second chamber (8b) increases more than the spring force of this spring (I9), the valve body (18) opens and closes the check valve (I5). is now open.

The remaining check valve (l6) on the right side in FIG. 4 is a component of the communication means of the present invention, and allows oil (9) to flow from the first chamber (8a) to the second chamber (8b). Like the check valve (15), it has a valve seat (21) and a valve body (22).
It consists of

(23) is a spring that maintains the valve body (22) in the closed state, and its spring force is set to be 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 the second
It communicates with the chamber (8b), and also has a small passageway (26) in the upper part.
) is in communication with the first chamber (8a).

As shown in FIGS. 5 and 6, an on-off valve that opens and closes the communication path (24) is provided in the middle of the communication path (24), but in the illustrated example, this on-off valve is a switching valve (37 ) is used. This switching valve (37) has two first and second valve chambers (39) (40) and each of the valve chambers 09) (
The valve body (40) is provided with two valve bodies (43) and (44) corresponding to the valve seats (41) and (42), respectively.

The first valve chamber (39) is connected to the second chamber (
8b), and the second valve chamber (4o) communicates with the gas chamber (38).
The gas cylinder (45) and the first chamber (8a) in the cylinder (8) communicate with each other.

The valve bodies (43) and (44) are connected via a connecting member (46), and the valve body (44) of the second valve chamber (4o) is moved in the valve closing direction by a spring (47) elastically loaded on the back. It is supported in a state where it is energized.

The spring force of this spring (47) is the spring force of the check valve (l5).
9) is set equal to or higher than that of 9).

The above-mentioned spring (47) prevents the movement of heno oil (9) from the second chamber (8b) to the first chamber (8a) within the range of the spring force, and at the same time, the pressure in the second chamber (8b) is reduced. When it rises above a certain level, it is compressed by the pressure and the first chamber (
8a) side, open the valve body (44) and open the second chamber (
8b) to the first chamber (8a). Thus, the switching valve (37) is an opening/closing valve for the communication means, and at the same time, like the check valve (15), it also serves as an IJ-F valve for the buffer means.

(48) is an operating shaft which is an opening/closing means for the switching valve (37), and faces the first valve chamber (39) so as to be able to move forward and backward.
43) Push (44) to open the valve.

On the other hand, the gas cylinder (4) constituting the gas chamber (38)
5) constitutes the compensation means of the present invention, and is provided separately from the cylinder (8) and partitioned by a partition wall (45a) that is slidably fitted inside the cylinder (45). , one of the gas chambers (38) is filled with an inert gas (10) such as nitrogen gas, the other is filled with oil (9), and the oil (9) is passed through the connecting pipe (45b) to the By communicating with the valve chamber (40) of the switching valve (37),
The gas cylinder (45) is inserted into the first chamber (8a) of the cylinder (8).
) have been contacted.

When the cylinder (8) and the gas cylinder (45) are provided separately as described above, the clamp bracket (2) and the swivel bracket (3) are There is an advantage that the length of the cylinder (8), which is subject to the restriction that it must be disposed within a narrow range between the cylinder (8) and the cylinder (8), can be shortened and the cylinder (8) can be made smaller.

In addition, a gas cylinder (45) separated from the cylinder (8)
For example, so as not to interfere with both brackets (2) and (3),
It is fixed along one side of the cylinder (8).

When the outboard motor (B) is held in the locked state during normal running, the rod (11) enters the cylinder (8) as much as possible, the piston (12) is positioned upward, and the first chamber (8a) is narrowed. At the same time, the switching valve (37) is closed.

In this state, the gas cylinder (4) communicating with the first chamber (8a)
The inert gas in 5) is compressed by the inflow of oil (9) to compensate for the increase in volume due to the entry of the rod (1l).

In such a state, when a force is applied to the outboard motor (B) due to the thrust during reverse movement, the rod (1l) tries to exit from the cylinder (8) and moves into the second chamber (8b). The pressure rises, but the check valve (l5) does not open and the communication passage (24) is closed when the pressure rises to this extent, so the oil (9) in the second chamber (8b) flows into the first chamber ( 8
It will not flow to 3).

Therefore, the exit of the rod (1l) is restricted and the outboard motor (B
) is retained.

Similarly, even during deceleration or braking during normal running, the outboard motor (B) does not jump up and maintains its latched state.

Next, when the outboard motor (B) is released from the locked state when traveling in shallow water or landing, the switching valve (37) is opened to open the communication passage (24).

Therefore, when a tilt-up operation is performed to pull up the outboard motor (B), the rod (It) exits from the cylinder (8), the piston (l2) is displaced downward, and the second chamber (8b) is accordingly moved. The oil (9) in the reduced chamber (8b) is transferred to the communication path (
24) into the first chamber (8a).

When the rod (1l) is withdrawn from the cylinder (8), the total volume of the working fluid storage section in the cylinder consisting of the first chamber (8a) and the second chamber (8b) is moved out of the cylinder (8).
1), but the working fluid corresponding to this volume increase is supplied from the oil (9) contained in the gas cylinder (45) into the first chamber (8e). will be compensated for.

On the other hand, when the rod (1l) is inserted into the cylinder (8), the total volume of the working fluid storage section in the cylinder decreases by the amount that the rod (l1) is inserted into the cylinder (8). However, along with this volume reduction, the cylinder (
The working fluid flowing out from the gas cylinder (45)
) is compensated for by being accommodated in the partition wall (45!) while pushing it up.

Also, before the tilt-up operation, the dead weight of the outboard motor (B) moves the piston (l2) to the first position via the rod (11).
It is in a state of pushing up toward the chamber side and compressing the inert gas (10) in the gas cylinder (45) communicating with the first chamber (8a). When the outboard motor (B) is pulled up by the tilt-up operation as described above, the compressed inert gas (I
The repulsive force caused by O) increases the pressure in the first chamber (8a) and acts in the direction of withdrawing the rod (11), thereby reducing the load when lifting the outboard motor (B) itself, and tilting accordingly. You can easily perform up operations.

Furthermore, when the rod (11) is withdrawn from the cylinder (8) due to a tilt-up operation, the first
The inert gas (10) in the chamber (8a) expands to compensate for the volume reduction.

The gas cylinder (45) serving as a compensating means stores the external force applied in the direction of inserting the rod (11) as pressure energy, and uses the stored pressure energy when performing a tilt-up operation as a force for withdrawing the rod (1l). It also has the function of a power storage device that can be used as a power storage device to reduce tilt-up loads.

Also, when the switching valve (37) is closed and the outboard motor (B) is released in the tilted-up state, the communication passage (24) is closed and the oil (9) does not flow from there, but the outboard motor (B) is Machine (B
) acts on the rod (1l) in the direction of entry, increasing the pressure in the first chamber (8a).

The pressure rise in the first chamber (8a) opens the check valve (16), and the oil (9) in the first chamber (8a) flows into the second chamber (8b), causing the rod (11) to flow into the second chamber (8b). is the cylinder (8)
Go inside.

Therefore, if this continues, the outboard motor (B) will rotate downward, so in order to maintain the pulled up state of the outboard motor (B), the locking lever (7) must be moved between the clamp brackets (2 and 3) as described above.
).

When the outboard motor (B) collides with an obstacle, the impact causes the check valve (15) to open, but the spring force of the spring (47) in the switching valve (37) opens the check valve. (15
), the valve body (44) that was blocking the movement of oil (9) from the first chamber (8a) to the second chamber (8b) opens.

That is, the pressure in the second chamber (8b) acts on the first valve chamber (39), which communicates with it via the communication passage (24), and the pressure in the second chamber (39)
9) The valve body (44) opens as the pressure increases.

Therefore, the oil (9) in the second chamber (8b) reaches the piston (l2).
The first chamber (8
flows into a).

In addition, if the spring force of the spring (47) is set to be larger than the above-mentioned knob (19), the outboard motor (B) will receive a larger impact than the force that opens the check valve (l5). When the check valve (l5) is opened, the switching valve (37) opens with the opening movement of the valve body (44), and the oil (
By flowing 9), the impact can be alleviated in two stages.

Next, after the shock is released, the check valve (l5) closes, but in this state, the dead weight of the outboard motor (B) is applied to the rod (11).
As a result, the pressure in the first chamber (8a) increases, and the check valve (l6) opens and the oil (9) in the first chamber (8a) increases.
flows into the second chamber (8b).

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

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

On the other hand, the partition wall (45a) that fits inside the gas cylinder (45) described above does not necessarily need to be provided, and even if it is not provided, the above-described impact mitigation can be achieved. However, in the case where the partition wall (45a) is fitted inside as in the above embodiment, even if the partition wall (45a) is subjected to vibrations due to impact force or vibrations from the engine, etc., the inert gas (IO) in the oil (9)
) can be completely prevented from being mixed in by the partition wall (45a), so the above-mentioned impact mitigation characteristics can be made very stable.

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

■ The tilt lock device of the present invention prevents the working fluid from moving from the second chamber to the first chamber, and opens when the pressure in the second chamber rises above a predetermined level, allowing the working fluid to flow from the second chamber to the first chamber. a buffer means consisting of a relief valve that allows movement of the propulsion unit and acts as a buffer when the propulsion unit hits an underwater obstacle; When applying an external force in the direction, it is possible to take a tilt-down state that allows movement of the working fluid from the first chamber to the second chamber, and at least apply an external force in the withdrawal direction to the rod by the backward thrust generated by the propulsion unit. and a communication means that can prevent movement of the working fluid from the second chamber to the first chamber. Therefore, it can absorb the back thrust load within the range that occurs during normal driving, reliably preventing the propulsion unit from jumping up when reversing or suddenly decelerating, and also prevent the propulsion unit from jumping up suddenly when colliding with an obstacle such as driftwood. The pressure in the second chamber is discharged from the relief valve of the buffer means toward the first chamber, making it possible for the propulsion unit to flip up, reducing the impact force generated at that time, and furthermore, allowing the propulsion unit to tilt up. When the system is in the tilt-down state, the communication means can move the working fluid from the first chamber to the second chamber to return the propulsion unit to the tilt-down state, and it provides the basic functions necessary for a tilt-lock device without any problems. It is possible.

■ It is arranged outside the in-cylinder working fluid storage section consisting of a first chamber and a second chamber, and when the rod is inserted into the cylinder, the working fluid is removed by the amount that reduces the volume of the cylinder working fluid storage section. When storing and withdrawing the rod,
Compensation means is provided for supplying working fluid to the in-cylinder working fluid accommodating portion corresponding to the increase in the volume of the in-cylinder working fluid accommodating portion, so that the rod does not move out of the cylinder when tilting up. The compensating means supplies working fluid corresponding to the increase in volume of the cylinder working housing caused by this, and conversely, the volume reduction of the cylinder working housing due to the rod being inserted into the cylinder during tilt-down. A corresponding working fluid can be accommodated in the compensating means. Therefore, it becomes possible to reliably compensate for the increase or decrease in the volume of the in-cylinder working fluid storage portion that occurs due to the insertion and withdrawal of the rod by the compensation means.

■ A cylinder containing working fluid, a rod inserted into this cylinder, a buffer means, a communication means, and a compensating means, are used to latch and release the propulsion unit, buffer the impact force in the event of a collision, and act as a working fluid storage section in the cylinder. Since the volume increase/decrease compensation is performed in the tilt lock device, the basic function of the tilt lock device and the volume increase/decrease compensation function described above can be provided with a simple configuration.

[Brief explanation 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 the cylinder, and Figs. 5 and 6 are schematic views of the device. be. In the diagram (B)... Outboard motor (b)... Outboard motor body (propulsion unit) (A)...
Hull (2)...Clamp bracket (support bracket) (
3)...Swivel bracket (flexible bracket) (8
)...Cylinder (8a)...First chamber (8b)...Second chamber (9)...Oil (working fluid) (0)...Inert gas (1l)...Rod (l2)... Piston (13)... Passage (15)... Check valve (relief valve) (l6)... Check valve (24)... Communication passage (45g)... Switching valve (relief valve) (opening/closing valve)...valve body...gas cylinder (compensating means)...compartment wall...spring...operating shaft (opening/closing means) Applicant: Yamaha Motor Co., Ltd. Application Hitosanshin Kogyo Co., Ltd. - 868-1 Figure 4 Procedural Amendment (Method) May 23, 1990 Heisei Patent Application No. 2 Title of Invention Drawing of tilt lock device for outboard motor

Claims (10)

[Claims] (1) A cylinder rotatably supported by one of a support bracket attached to the hull and a flexible bracket supporting a propulsion unit and pivotally supported to be able to move up and down with respect to the support bracket, and containing a working fluid; a rod that is inserted into and out of the cylinder and rotatably supported by the remaining one of the brackets; The first part expands when an external force in the withdrawal direction is applied to the
A piston that is divided into two chambers, a second chamber that is compressed in the opposite direction, and a piston that prevents movement of working fluid from the second chamber to the first chamber and when the pressure of the second chamber rises above a predetermined level. a buffer means consisting of a relief valve that opens to allow movement of working fluid from the second chamber to the first chamber and acts as a buffer when the propulsion unit hits an underwater obstacle; and the first and second chambers. and is disposed outside the in-cylinder working fluid accommodating part, and when the rod is inserted into the cylinder, the working fluid is accommodated in an amount equivalent to the volume of the in-cylinder working fluid accommodating part being reduced, and the rod is inserted. a compensating means capable of supplying working fluid to the in-cylinder working fluid storage portion corresponding to an increase in the volume of the cylinder working fluid storage portion, and disposed in a communication path between the first chamber and the second chamber, When an external force is applied to the rod in the insertion direction, it can be tilted down to allow movement of the working fluid from the first chamber to the second chamber, and at least the backward thrust generated by the propulsion unit forces the rod in the withdrawal direction. A tilt lock device for an outboard motor, comprising a communication means capable of preventing movement of working fluid from a second chamber to a first chamber when an external force is applied. (2) As a component of the communication means, it prevents the movement of working fluid from the second chamber to the first chamber during forward sailing, and also enables immediate tilt-down after the propulsion unit jumps up due to the impact during forward sailing. Claim 1 wherein a check valve is arranged to allow movement of working fluid from the first chamber to the second chamber.
Tilt lock device for the outboard motor described. (3) The tilt lock device for an outboard motor according to claim 2, characterized in that a check valve is disposed on the piston. (4) The tilt lock device for an outboard motor according to claim 1, wherein a buffer means is arranged on the piston. (5) The tilt lock device for an outboard motor according to claim 1, wherein the communication means is arranged outside the cylinder. (6) Claim characterized in that the communication means allows the working fluid to move from the second chamber to the first chamber at the same time as it allows the working fluid to move from the first chamber to the second chamber. 1. The tilt lock device for an outboard motor according to 1. (7) The tilt lock device for an outboard motor according to claim 1, further comprising a buffer means disposed outside the cylinder. (8) The tilt lock device for an outboard motor according to claim 3, further comprising a second buffer means disposed outside the cylinder. (9) The tilt lock device for an outboard motor according to claim 1, wherein the communication means has an opening/closing means that also serves as a buffer means and opens and closes the relief valve. (10) The communication means allows the working fluid to move from the first chamber to the second chamber in the open state, and also allows the working fluid to move from the second chamber to the first chamber, and in the closed state. 2. The tilt lock device for an outboard motor according to claim 1, further comprising an on-off valve that shuts off the first chamber and the second chamber.