JPH04126694A - Tilter device for ship-propulsion machine - Google Patents

Abstract

PURPOSE:To simplify the operating circuit by forming within a housing in series a small-diameter chamber for tilting piston and a large-diameter cylinder chamber for trimming piston and connecting a piston rod integral with the tilting piston to one of a clamp bracket and a swivel bracket. CONSTITUTION:The tilter device which is interposed between a clamp bracket 12 and a swivel bracket 14 is prepared by pin-connection to the clamp bracket 12 of a housing 19 formed by serial communication between a small-diameter cylinder chamber 23 and a large-diameter cylinder chamber 24, a tilting piston 20 being accommodated within the small-diameter cylinder chamber 23 of the housing 19. This tilting piston 20 is provided with an absorber valve 27 which, at the time of collision with flow wood articles, is opened when the pressure in the small-diameter cylinder chamber 23 has reached a value larger than a prescribed value, so as to enable supply or transfer of the operating oil in the chamber 23 into an intermediate chamber 25. And the end portion of a piston rod 21 protruded from the small-diameter cylinder chamber 23 is pin- connected to the swivel bracket 14. Further, a trimming piston 22 is accommodated within the large-diameter cylinder chamber 24 and is urged toward the chamber 23 side by means of a large-diameter spring 30.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a tilt device for a marine propulsion device for an outboard motor, an inboard/outboard motor, and the like.

[Prior Art] A marine propulsion device has a trim cylinder and a tilt cylinder arranged in parallel between a clamp bracket fixed to the stern plate and a swivel bracket tiltably supported by the clamp bracket via a tilt axis. It is equipped with an interposed tilt device.

The above tilt device tilts the propulsion unit within a predetermined trim range through trim up and trim down operations using the trim cylinder, and adjusts the sailing attitude to changes in water surface load, making it possible to obtain the best sailing condition. The propulsion unit can be tilted within a predetermined tilt range by tilting up and down operations using the tilt cylinder.

However, in conventional tilt devices, the tip of the piston rod of the trim cylinder supported by the clamp bracket is in sliding contact with the swivel bracket, and during trim up and trim down operations, There is a possibility that abnormal noise may be generated due to the sliding contact between the tip of the piston rod and the swivel bracket.

Therefore, in order to be able to trim up and trim down without having the piston rod tip of the trim cylinder come into sliding contact with the clamp bracket or swivel bracket, the present applicant has developed a system in which a trim cylinder and a tilt cylinder are arranged in series, and the trim cylinder is proposed a tilt device in which the tip of a piston rod of a tilt cylinder is connected by a pin to a clamp bracket or a swivel bracket, and the tip of a piston rod of a tilt cylinder is connected to a swivel bracket or a clamp bracket by a pin (Japanese Patent Publication No. 2-5637).

[Problem to be solved by the invention] However, in the prior art of Japanese Patent Publication No. 2-5637, a trim cylinder and a tilt cylinder which are independent of each other are arranged in series, so the fluid pressure circuit is connected to the trim cylinder. Is it necessary to connect fluid pressure supply lines to each of the four chambers, the upper chamber and the royal chamber, and the upper chamber and the royal chamber of the tilt cylinder? Further, a complicated operating circuit is required that can appropriately switch and connect each fluid pressure supply line to a pump serving as a fluid pressure supply source in accordance with various operating modes such as trim operation and tilt operation.

Furthermore, with a tilt device, it is necessary to quickly tilt up when you want to tilt, and move slowly when you want to trim. In other words, it is required to have a function that enables full range tilt operation when there is no propeller thrust, and enables trim operation when propeller thrust is generated.

When configuring a tilt device that performs a trim operation and a tilt operation, the present invention connects the tip of a piston rod of the tilt device to a clamp bracket or a swivel bracket so that the trim operation can be performed without slidingly contacting those brackets, and The purpose is to reduce the number of fluid pressure supply pipes and simplify the operating circuit.

Another object of the present invention is to make it possible to quickly tilt up and down with a small force when there is no propeller thrust, and to finely adjust the trim angle with a large force that can counteract the propeller thrust when propeller thrust is generated. .

[Means for Solving the Problems] The present invention as set forth in claim 1 provides a tilt device for a marine propulsion device interposed between a clamp bracket on the hull side and a swivel bracket on the propulsion unit side. and a large diameter cylinder chamber, the housing is connected to one of the clamp bracket and the swivel bracket, and the small diameter tilt piston is reciprocatably housed in the small diameter cylinder chamber of the housing sink. A piston rod is connected to the piston and is used by connecting the end protruding from the small diameter cylinder chamber of the housing sink to the other of the clamp bracket and the swivel bracket. It is provided with a through passage for applying the fluid pressure in the cylinder chamber to the end face of the tilt piston on the side opposite to the piston rod, and is provided with a sealing surface that comes into close contact with a portion corresponding to the end face of the tilt piston on the side opposite to the piston rod around the through passage, It has a large-diameter trim piston to which an acting force is applied toward the small-diameter cylinder chamber, and is configured such that a fluid pressure circuit can be connected to each of the small-diameter cylinder chamber and the large-diameter cylinder chamber.

In the present invention according to claim 2, the housing is provided with an intermediate chamber that communicates with the large diameter cylinder chamber between the tilt piston and the trim piston, and the intermediate chamber is provided with a fluid reservoir through a communication passage. can communicate with each other, and a valve device is disposed in the communication path, and the valve device (1) allows fluid to flow from the fluid reservoir to the intermediate chamber when the pressure in the intermediate chamber is lower than the pressure in the fluid reservoir; When the pressure in the intermediate chamber is greater than the pressure in the fluid reservoir, the fluid is configured to allow fluid to flow from the intermediate chamber to the fluid reservoir only when the pressure in the large diameter cylinder chamber is greater than a predetermined value. It is.

[Function] According to the present invention as set forth in claim 1, the tilt device performs the following from the tilt-down state according to <1) and (2) below.
Trim up and tilt up work.

(1) When the fluid pressurized by the trim-up fluid pressure supply source (pump) flows from the fluid pressure circuit into the large-diameter cylinder chamber, the sealing surface of the trim piston and the portion of the tilt piston that corresponds to the end surface on the side opposite to the piston rod come into close contact with each other. Therefore, the fluid tends to push the trim piston toward the small diameter cylinder chamber. At this time, since the fluid in the small diameter cylinder chamber flows out into the fluid pressure circuit, the tilt piston moves as the trim piston moves, and the piston rod is projected to the outside of the small diameter cylinder chamber to be trimmed up. Then, the trim piston collides with the stroke end in the trim-up direction inside the large-diameter cylinder chamber, resulting in maximum trim-up.

(2) Tilt up In (1) above, after the trim piston has moved to the maximum trim up position, when fluid is further supplied to the large diameter cylinder chamber, the fluid pressure in the large diameter cylinder chamber is increased by the pressure provided to the trim piston. It extends from a certain through passage to the end surface of the tilt piston on the side opposite to the piston rod. As a result, the fluid supplied to the large-diameter cylinder chamber fills the intermediate chamber that is gradually expanded and formed between the trim piston and the tilt piston, and the fluid in the small-diameter cylinder chamber flows out to the fluid circuit, so that only the tilt piston Or I'll have to move. As a result, the piston rod further protrudes outward from the small diameter cylinder chamber and tilts up. Then, the tilt piston collides with the stroke end in the tilt-up direction in the small diameter cylinder chamber, resulting in the maximum tilt-up.

Note that when the tilt-up is completed, the trim piston does not receive fluid pressure that tries to push the piston up toward the small-diameter cylinder chamber, but it is constantly subjected to acting forces such as spring force and gravity toward the small-diameter cylinder chamber. and stays at the stroke end in the trim-up direction inside the large-diameter cylinder chamber.

In addition, the tilt device can be adjusted from the tilt up state (3) below.
, (4), the tilt-down and trim-down operations are performed.

(3) When fluid pressurized by the tilt-down fluid pressure supply source flows from the fluid pressure circuit into the small-diameter cylinder chamber, the fluid pushes the tilt piston down toward the large-diameter cylinder chamber. As a result, the piston rod sinks into the small diameter cylinder chamber and tilts down. At this time, the fluid in the intermediate chamber between the trim piston and the tilt piston flows out from the through passage of the trim piston, through the large diameter cylinder chamber, and into the fluid pressure circuit. Then, the portion corresponding to the end surface of the tilt piston on the side opposite to the piston rod comes into contact with the trim piston staying at the stroke end in the trim-up direction in the large-diameter cylinder chamber, and the tilt-down is completed.

(4) Trim down After the tilt down in (3) above is completed, when fluid is further supplied to the small diameter cylinder chamber, the tilt piston is pushed down into the large diameter cylinder chamber together with the trim piston, and the large diameter Since the fluid in the cylinder chamber flows out to the fluid pressure circuit, the piston rod retracts further into the small diameter cylinder chamber and is trimmed down. Then, the trim piston comes into contact with the stroke end in the trim-down direction inside the large-diameter cylinder chamber, and the trim-down ends.

Here, in the present invention according to claim 1, (1) to
(2) The transition process from trim up to tilt up,
In the transition process from tilt down to trim down in (3) and (4), the effective area of the piston changes between the large diameter trim piston and the small diameter tilt piston. For this reason,
The moving speed of the piston rod is [trim range x tilt range], and the force acting on the piston rod is [trim range>tilt range]. That is, in the present invention, (1) in the trim region, it is possible to finely adjust the trim angle against the propeller thrust, and shallow water navigation is also possible; (2) in the tilt region, the relatively small force required to support the propulsion unit's own weight is You can quickly tilt up/down.

However, in the present invention as set forth in claim 1, when configuring the above-mentioned trim operation and tilt operation, the following effects (1) and (2) occur.

■A small-diameter cylinder chamber for the tilt piston and a large-diameter cylinder chamber for the trim piston are formed in series in the shaped housing, and one of the clamp bracket and swivel bracket is connected to the housing sink, and the tilt piston is connected to the housing sink. An integral piston rod was connected to the other of the clamp bracket and the swivel bracket. That is, by connecting the tip of the piston rod of the tilt device to a clamp bracket or a swivel bracket, trimming can be performed without slidingly contacting these brackets.

(2) For the fluid pressure circuit, it is sufficient to connect a fluid pressure supply pipe to each of the two chambers, the small-diameter cylinder chamber and the large-diameter cylinder chamber, and the number of fluid pressure supply pipes can be reduced.

Therefore, an operating circuit that can appropriately switch and connect each fluid pressure supply pipe to a pump serving as a fluid pressure supply source according to various operating modes such as trim operation and tilt operation also requires only two fluid pressure supply pipes. It is sufficient to construct it for , and it is simple.

According to the present invention as set forth in claim 2, the tilt device performs a tilt operation and a trim operation as described in (A) and (B) below.

(A) Tilt operation When the propulsion unit is stopped or in neutral and there is no propeller thrust, the only force acting on the tilt device is the propulsion unit's own weight, so the pressure in the large diameter cylinder chamber and the intermediate chamber is small. That is, the pressure in the intermediate chamber is less than the pressure in the fluid reservoir so that fluid in the fluid reservoir can flow into the intermediate chamber;
Fluid flow in the opposite direction from the intermediate chamber to the fluid reservoir is not permitted. Therefore, the trim piston cannot be moved.

Therefore, in this case, only the tilt piston capable of discharging the fluid in the small-diameter cylinder chamber can move in the apple-down direction, and only the tilt-up-tilt-town tilt operation is performed.

That is, when there is no propeller thrust, by moving only the small-diameter tilt piston, which has a small effective piston area, it is possible to quickly tilt up and down with a small force.

(B) Trim operation When propeller thrust is generated, a large force is applied to the large diameter cylinder chamber and the intermediate chamber. That is, when the pressure in the intermediate chamber is greater than the pressure in the fluid reservoir and the pressure in the large diameter cylinder chamber is greater than a predetermined value, the fluid in the intermediate chamber can be discharged into the fluid reservoir and the trim piston begins to move.

Therefore, in this case, the trim piston, which allows the fluid in the intermediate chamber to be discharged, moves in the apple-down direction.
Perform trim apple trim down trim operations.

That is, when a propeller thrust is generated, the trim angle can be finely adjusted by moving the large-diameter trim piston having a large effective piston area, using a large force that opposes the propeller thrust.

[Embodiment] Fig. 1 is a side view showing an outboard motor to which an embodiment of the present invention is applied, Fig. 2 is a sectional view showing the tilt device of Fig. 1,
Figure 3 (A) is an explanatory diagram of trim up, Figure 3 (B) is an explanatory diagram of tilt up, Figure 4 (A) is an explanatory diagram of tilt down, Figure 4 (B) is an explanatory diagram of trim town, and Figure 5 FIG. 5(A) is an explanatory diagram of the operation upon collision with driftwood, FIG. 5(B) is an explanatory diagram of restoration after collision with driftwood, and FIG. 6(A) is a sectional view showing a tilt device according to another embodiment of the present invention. FIG. 6(B) is an explanatory diagram of the operation at the time of collision with driftwood.

A clamp bracket 12 is fixed to the stern plate 11A of the hull 11, and a swivel bracket 14 is pivotally connected to the clamp bracket 12 via a tilt shaft 13 so as to be rotatable around a substantially horizontal axis. The swivel bracket 14 has
The propulsion unit 15 is rotatably mounted around the steering shaft via a steering shaft (not shown) arranged substantially vertically. An engine unit 16 is mounted on the upper part of the propulsion unit 15, and a propeller 17 is provided on the lower part of the propulsion unit 15. That is, the outboard motor 10 can be tilted through a trim range or a tilt range as shown by a two-dot chain line from a down position shown by a solid line in FIG. 1 by a tilt device 18 described below. The outboard motor 10 maintains the propulsion unit 15 at a relatively gentle inclination within the trim range, thereby making it possible to obtain an optimal cruising attitude against changes in the water surface funnel.

A tilt device 18 as shown in FIG. 2 is interposed between the clamp bracket 12 and the swivel bracket 14. The tilt device 18 includes a cap 19A and a main body 19B.
The housing 19 includes a housing 19, a tilt piston 2o, a piston rod 21, and a trim piston 22. The housing 19 has a small diameter cylinder chamber 23
and a large-diameter cylinder chamber 24 are connected in series and connected to the clamp bracket 12 with a pin. In addition, house sink 1
In addition to the small-diameter cylinder chamber 23 and the large-diameter cylinder chamber 24, the intermediate chamber 25 communicating with the large-diameter cylinder chamber 24 can be formed between the tilt piston 20 and the trim piston 22, and is located at the maximum trim-up position. trim piston 22
It is possible to form a release chamber 26 that is isolated from both the large diameter cylinder chamber 24 and the intermediate chamber 25 by the outer peripheral end surface of the cylinder chamber 24 .

Note that the release chamber 26 is connected to a reservoir 32, which will be described later, via a connection port 26a.

The tilt piston 2o has a small diameter and is housed in a small diameter cylinder chamber 23 of the housing sink 19 so as to be able to reciprocate.

The tilt piston 20 has an absorber valve 27. The absorber valve 27 opens when the pressure in the small-diameter cylinder chamber 23 abnormally increases when the driftwood collides with it and reaches a predetermined pressure value or higher, and drains the hydraulic oil in the small-diameter cylinder chamber 23 to the intermediate chamber 25. Make it transportable.

The piston rod 2↓ is connected to the tilt piston 2o, and its end protruding from the small diameter cylinder chamber 23 of the housing sink 19 is pin-coupled to the swivel bracket 14.

The trim piston 22 has a large diameter and is housed in a large-diameter cylinder chamber 24 of the housing sink 19 so as to be able to reciprocate. A through passage 28 is provided for affecting the end surface forming the chamber 25. Further, the trim piston 22 includes a seal member 29 that comes into close contact with the end surface of the tilt piston 20 on the side opposite to the piston rod 21 around the through passage 28 . Further, a spring 30 is interposed between the trim piston 22 and the end face of the large diameter cylinder chamber 24, thereby constantly applying an acting force toward the small diameter cylinder chamber 23. In the tilt device 18, hydraulic circuits described below are connected to connection ports 23a and 24a of the small-diameter cylinder chamber 23 and the large-diameter cylinder chamber 24, respectively.

32 has a watertight reservoir that can store hydraulic oil,
A reversible gear pump 35 is connected to the reservoir 32 through conduits 33 and 34, and the pump 35 can be selectively rotated forward or reverse by a reversible DC motor 36.

37 is an opening/closing device, which has a shuttle piston 38, a first check valve 39 and a second check valve 4o located on both sides of the shuttle piston 38, and a first shuttle chamber 41 on the first check valve 39 side of the shuttle piston 38. define,
A second shuttle chamber 42 is defined on the second check valve 40 side of the shuttle piston 38, a first check chamber 43 is defined around the valve body of the first check valve 39, and a first check chamber 43 is defined on the second check valve 40 side of the shuttle piston 38.
A second check chamber 44 is defined around the valve body. The first check valve 39 opens the pipe line 4 by normal rotation of the pump 35.
The second check valve 40 is opened by the oil supply pressure applied to the first shuttle chamber 41 via the pump 35.
The opening operation is enabled by the oil supply pressure applied to the second shuttle chamber 42 via the conduit 46 by reversing the rotation.

In addition, the shuttle piston 38 operates to open the second check valve 40 by the oil feeding pressure caused by the forward rotation of the pump 35, and opens the first check valve 3 by the oil feeding pressure caused by the reverse rotation of the pump 35.
9 is enabled to open.

The first check chamber 43 of the opening/closing device 37 is communicated with the large diameter cylinder chamber 24 via a conduit 47 and a connection port 24a. In addition, the second check chamber 44 of the opening/closing device 37 has a conduit 4.
8 and a small diameter cylinder chamber 23 via a connection port 23a.

A check valve 57 is interposed in the middle of the pipe line 33. That is, when the outboard motor 10 is operated between tilt town and trim town, when the piston rod 21 reaches the maximum retracted position and oil is no longer returned from the large diameter cylinder chamber 24 to the pump 35, the pump 35 still operates. Then, the check valve 57 is opened so that hydraulic oil can be supplied from the reservoir 32 to the pump 35.

Further, a check valve 58 is interposed in the intermediate portion of the pipe line 34. That is, when the outboard motor 10 is trimmed up or tilted up, the internal volume of the small diameter cylinder chamber 23 increases by the amount of the withdrawal volume of the piston rod 21, and the amount of circulating hydraulic oil becomes insufficient. The valve 58 is opened to compensate for the lack of circulating oil from the reservoir 32 to the pump 35.

Further, an up relief valve 59 is connected to the intermediate portion of the pipe line 47. That is, when the piston rod 21 reaches the maximum extension position during a trim-up-tilt-up operation of the outboard motor 10, the up-relief valve 59 is opened, allowing the oil discharged from the pump 35 to be returned to the reservoir 32. .

Further, a down relief valve 60 is connected to the conduit 46. That is, when the outboard motor 10 is operated for tilt-down and trim-down, the volume of the small-diameter cylinder chamber 23 is reduced by the amount of entry volume of the piston rod 21, and if a surplus is generated in the amount of circulating hydraulic oil, the town relief valve 60 is opened to allow oil discharged from the pump 35 to be returned to the reservoir 32.

Further, a manual valve 61 is interposed between the pipe line 47 and the pipe line 48. That is, by opening the manual valve 61, communication between the small-diameter cylinder chamber 23 and the large-diameter cylinder chamber 24 is made possible, and the piston rod 21 is manually expanded and contracted to move the propulsion unit 15 between its down position and maximum tilt-up position. It can be freely oscillated between.

Next, the operation of the tilt device 18 will be explained.

(1) Trim-up (see FIG. 3(A)) When the motor 36 and pump 35 are rotated forward, the oil discharged from the pump 35 flows from the pipe 45 to the first shuttle chamber 41 of the opening/closing device 37.
Shuttle piston 38 moves to the right in FIG. 3 and forces second check valve 40 open. Further, the hydraulic oil that has flowed into the first shuttle chamber 41 of the opening/closing device 37 uses its own pressure to push open the first check valve 39, and as shown by the solid line arrow, the hydraulic oil flows through the pipe 47.
It is sent to the large-diameter cylinder chamber 24 via. In this way, when the hydraulic oil flows into the large diameter cylinder chamber 24, the sealing member 29 of the trim piston 22 and the end surface of the tilt piston 20 on the side opposite to the piston rod 21 are in close contact, so that the hydraulic oil flows into the trim piston 22. is pushed up toward the small diameter cylinder chamber 23. At this time, small diameter cylinder chamber 2
3 flows out into the pipe 48, and the working oil in the intermediate chamber 25 flows out into the reservoir 32. Therefore, as the trim piston 22 moves, the tilt piston 20 also moves, moving the piston rod 21 into the small diameter cylinder chamber. Protrude outward from 23 and trim up. Then, the trim piston 22 comes into contact with the stroke end in the trim-up direction within the large-diameter cylinder chamber 24, resulting in maximum trim-up.

(2) Tilt up (see Figure 3 (B)) In (1) above, after the trim piston 22 has moved to the maximum trim up position, when hydraulic oil is further supplied to the large diameter cylinder chamber 24, the Hydraulic oil pressure within the radial cylinder chamber 24 is applied from a through passage 28 provided in the trim piston 22 to the end surface of the tilt piston 20 on the side opposite to the piston rod 21 . As a result, the hydraulic oil supplied to the large-diameter cylinder chamber 24 is filled into the intermediate chamber 25 that is gradually expanded and formed between the trim piston 22 and the tilt piston 20, and the hydraulic oil in the small-diameter cylinder chamber 23 is filled through the pipe. 48, the tilt piston 2
Only 0 will be moved. At this time, the seal member 29 of the trim piston 22 and the tilt piston rod 21
Although the side end surfaces are separated, since the trim piston 22 is in close contact with the seal member 19C provided on the cap 19A, hydraulic oil will not leak from the intermediate chamber 25 to the release chamber 26. As a result, the piston rod 21 further protrudes outward from the small diameter cylinder chamber 23 and tilts up. Then, the tilt piston 20 collides with the stroke end in the tilt up direction in the small diameter cylinder chamber 23,
Maximum tilt up.

Incidentally, at the end of the tilt-up, the trim piston 22 does not receive hydraulic oil pressure that tries to push the piston 22 up toward the small-diameter cylinder chamber 23;
It is under the action of the spring force of the spring 30 toward the side of 3,
It stays at the stroke end in the trim-up direction inside the large-diameter cylinder chamber 24.

(3) Tilt down (see FIG. 4(A)) When the motor 36 and pump 35 are reversed, the oil discharged from the pump 35 flows from the pipe 46 to the second shuttle chamber 42 of the opening/closing device 37, and the shuttle piston 38 Move to the left in Figure 4 and
Push open the check valve 39. Further, the hydraulic oil that has flowed into the second shuttle chamber 42 of the opening/closing device 37 pushes open the second check valve 40 with its own pressure, and is sent to the small diameter cylinder chamber 23 via a conduit 48 as shown by the solid arrow. It will be done. In this way, when the hydraulic oil flows into the small diameter cylinder chamber 23, the hydraulic oil pushes the tilt piston 20 down toward the large diameter cylinder chamber 24.

This allows the piston rod 21 to move into the small diameter cylinder chamber 23.
Immerse yourself inward and tilt down. At this time, the hydraulic oil in the intermediate chamber 25 between the trim piston 22 and the tilt piston 20 flows out from the through passage 28 of the trim piston 22, through the large diameter cylinder chamber 24, and into the pipe 47. Then, the end surface of the tilt piston 20 on the side opposite to the piston rod 21 comes into contact with the trim piston 22 that is stationary at the stroke end in the trim-up direction in the large diameter cylinder chamber 24.
Exit tiltdown.

(4) Trim down (see Figure 4 (B)) After completing the tilt down in (3) above, further remove the hydraulic oil from the small diameter cylinder chamber 2.
3, the tilt piston 20 is pushed down together with the trim piston 22 toward the large diameter cylinder chamber 24, and the hydraulic oil in the large diameter cylinder chamber 24 flows out to the pipe 47, so that the piston rod 21 is a small diameter cylinder chamber 23
Immerse yourself further inward and trim down. Then, the trim piston 22 reaches the stroke end in the trim-down direction in the large-diameter cylinder chamber 24, and the trim-down ends.

Here, in the tilt device 18, the upper "self (1) ~ (
In the transition process from trim up to tilt up in 2) and in the transition process from tilt down to trim town in (3) to (4), the effective area of the piston 20.22 or the large diameter trim piston 22 and the small diameter tilt piston It varies between 20 and 20. Therefore, the moving speed of the piston rod 21 is [trim range>tilt range], and the force acting on the piston rod 21 is [trim range>tilt range]. That is, in the above embodiment, (1) in the trim region, the trim angle can be finely adjusted against the propeller thrust, and shallow water navigation is also possible; (2) in the tilt region, the comparison required to support the propulsion unit's own weight is made possible. It can be tilted up and down quickly with a small amount of force.

(5) Driftwood collision (see Figures 5 (A) and (B)) ■ When the piston rod 21 is about to be pulled out suddenly due to the driftwood collision, the pressure of the hydraulic oil in the small diameter cylinder chamber 23 increases and the absorber valve 27 is opened, and the hydraulic oil in the small diameter cylinder chamber 23 moves to the intermediate chamber 25 formed between the tilt piston 2o and the trim piston 22. The impact force of the collision with the driftwood is absorbed by the pipe line resistance of the absorber valve 27.

■At this time, the trim piston 22 is raised by the force of the spring 30, but it cannot follow the rising speed of the tilt piston 20, so the tilt piston 20 and the trim piston 22 are separated, and the large diameter cylinder chamber 24 and the intermediate chamber 25 and release room 2
6 is connected.

As the piston rod 21 moves out of the housing 19, the pressure in the three chambers communicating with each other equal to the volume of the piston rod 21 becomes negative, but oil is supplied from the reservoir 32 to the release chamber 26.

(2) The tilt piston 20 stops when it has completely absorbed the impact force or when it hits the stroke end of the small diameter cylinder chamber 23.

■After hitting the driftwood, when the weight of the propulsion unit 15 or the rebound force when hitting the stroke end of the small-diameter cylinder chamber 23 acts on the piston rod 21, the small-diameter cylinder chamber 23 is sealed and becomes negative pressure. Become.

■At this time, by opening the manual valve 61, the reservoir 32
Hydraulic oil is supplied to the smaller diameter cylinder chamber 23 to eliminate the negative pressure, and the tilt piston 20 and piston rod 2
1 moves to the large diameter cylinder chamber 24 side. The tilt piston 20 comes into contact with the trim piston 22, and the tilt piston 20 and the trim piston 22 move down together to reach the stroke end of the large diameter cylinder chamber 24. At this stage, the oil in the volume of the piston rod 21 is removed from the manual valve 61.
is returned to the reservoir 32.

Alternatively, by rotating the reversible pump in the tilt-down direction, the piston rod can be restored to the down side.

Incidentally, the absorber valve 27 in the tilt piston 20 may be removed and the absorber valve 27A may be arranged in the pipe line that communicates the pipe line 47 and the pipe line 48 outside the tilt device W18 (the fifth
(See figure (A)). At this time as well, by opening the manual valve 61, the piston rod 21 pulled out due to the collision with the driftwood is restored to the down side.

However, the tilt device 218 has the following effects (1) and (2).

■Tilt piston 20 inside the unified house sink 19
A small diameter cylinder chamber 23 for the trim piston 22 and a large diameter cylinder chamber 24 for the trim piston 22 are formed in series, the clamp bracket 12 is connected to the housing 19, and the piston rod 21 integrated with the tilt piston 20 is connected to the swivel bracket 14. Connected. That is, the tip of the piston rod 21 of the tilt device 18 is connected to the clamp bracket 12 or the swivel bracket 14, and these brackets 12.1
You can perform trim operations without sliding into contact with 4.

■The hydraulic circuit consists of a small diameter cylinder chamber 23 and a large diameter cylinder chamber 2.
It is sufficient to connect the fluid pressure supply pipes 47 and 48 to each of the two chambers of 4, and the number of fluid pressure supply pipes can be reduced. Therefore, the operating circuit that allows each of the fluid pressure supply pipes 47, 48 to be connected to the pump 35 in an appropriate manner according to various operating modes such as trim operation, tilt operation, etc. is also required using only two fluid pressure supply pipes 47, 48. It is sufficient to construct it for 48, and it is simple.

Incidentally, when the tilt device shown in FIG. 2 is installed upside down, the spring 30 can be omitted.

The tilt device 118 in FIGS. 6(A) and 6(B) differs from the tilt device 18 described above in the following points (a) to (d).

(a) It was decided to install the tilt device 18 upside down, and the housing sink 19 was coupled to the swivel bracket 14 with a pin, and the piston rod 21 was coupled to the clamp bracket 12 with a pin.

(b) In accordance with (a) above, gravity was used as an acting force to constantly move the trim piston 22 toward the small diameter cylinder chamber 23, and the spring 30 in the tilt device [18] was removed.

(c) Absorber valve 27 for shock absorption during driftwood collision
In addition to providing the tilt piston 20 with a check valve 100 for restoration after a collision, a free piston 101 is interposed between the tilt piston 20 and the trim piston 22. As a result, the piston rod 21 pulled out due to the collision with the driftwood can be moved without waiting for the opening operation of the manual valve 61 in the tilt device 18.
The presence of the check valve 100 automatically causes the return operation, and the presence of the free piston 101 causes it to automatically return to the original position before the collision with the driftwood and stop.

(d) In the tilt device 118, the tilt device 1
8, when the piston rod 21 is pulled out due to a driftwood collision (see FIG. 6(B)), the release chamber 26 can be constructed so as not to communicate with both the large diameter cylinder chamber 24 and the intermediate chamber 25. In this case, the release chamber 26 can be released to the atmosphere without being made into a hydraulic oil filling chamber communicating with the reservoir 32. still,
In the tilting device shown in FIG. 6, the piston rod 21 is connected to the swivel bracket 14 with a pin, and
It is also possible to connect the clamp bracket 12 with a pin.

FIG. 7 is an explanatory diagram showing the tilt operation of a tilt device according to another embodiment of the present invention, FIG. 8 is an explanatory diagram of tilt-up, FIG. 9 is an explanatory diagram of tilt-down, and FIG. 1o is an explanatory diagram of the tilt device of FIG. 7. FIG. 11 is an explanatory diagram showing the trim operation, FIG. 11 is an explanatory diagram of trim-up, and FIG. 12 is an explanatory diagram of tilt-up following trim-up.

The tilt device 218 shown in FIGS. 7 to 12 differs from each of the tilt devices 18 and 118 described above in the following points. still,
In the tilt device 218, each of the tilt devices 18, 1
Functional parts substantially the same as 18 are given the same reference numerals.

In the tilt device 218, the intermediate chamber 25 and the release chamber 26
The reservoir 32 can be communicated with the connection port 26a through a communication passage 219, and a valve device 220 is disposed in the communication passage 219. The valve device 220 includes a check valve 221 and an unload valve 222.
It is composed of. The check valve 221 only allows flow from the reservoir 32 toward the connection port 26a. The unload valve 222 is normally closed and opens only when the pilot pressure connected to the large diameter cylinder chamber 24 exceeds a predetermined set value.

Therefore, the tilt device 218 performs a tilt operation and a trim operation as shown in (A) and (B) below.

(A) Tilt operation (see Figures 7 to 9) When the propulsion unit 15 is stopped or in neutral and there is no propeller thrust, the force applied to the tilt device 218 is only the propulsion unit's own weight, so the large diameter cylinder chamber 24 and the intermediate chamber 25 is small and the unloading valve 222 does not open, i.e. the pressure in the intermediate chamber 25 is smaller than the pressure in the reservoir 32;
The hydraulic oil in the reservoir 32 can flow into the intermediate chamber 25, and the flow of hydraulic oil in the opposite direction from the intermediate chamber 25 to the reservoir 32 is not allowed due to the presence of the check valve 221 and the closed unload valve 222. . For this reason, trim piston 2
2 cannot move.

Therefore, in this case, as shown in FIG. 7 (white arrow indicates tilt down, black arrow indicates tilt up), only the tilt piston 20 that can discharge the hydraulic oil from the small diameter cylinder chamber 23 can move in the apple down direction. Performs only tilt up/tilt down tilt operations. FIG. 8 shows the frame in a tilted up state, and FIG. 9 shows the frame in a tilted town state.

That is, when there is no propeller thrust, only the small-diameter tilt piston 20, which has a small effective piston area, moves;
Achieves quick tilt up and town with a small amount of force.

(B) Trim operation (see Figures 10 to 12) When propeller thrust occurs, large diameter cylinder chamber 24 and intermediate chamber 2
5 takes a lot of force. That is, since the pressure in the intermediate chamber 25 is higher than the pressure in the reservoir 32 and the pressure in the large diameter cylinder chamber 24 is higher than a predetermined set value, the unload valve 2
22 opens, the hydraulic oil in the intermediate chamber 25 can be discharged to the reservoir 32 via the open unload valve 222, and the trim piston 22 begins to move.

Therefore, in this case, as shown in FIG. 10 (white arrow indicates trim down, black arrow indicates trim up), the trim piston 22, which has made it possible to discharge the hydraulic oil from the intermediate chamber 25, cannot move in the apple-down direction. , performs the trim operation of trim apple trim down. And tilt device F218
In this case, after the trim piston 22 has moved to the maximum trim up position, when hydraulic oil is further supplied, only the tilt piston 20 moves, and a tilt operation such as tilt up and tilt down can be performed. FIG. 11 shows a trim-up state, and FIG. 12 shows a tilt-up state following trim-up. Note that during the trim-down operation, the hydraulic oil in the intermediate chamber 25 is replenished from the reservoir 32 via the check valve 221.

That is, when propeller thrust is generated, the movement of the large-diameter trim piston 22, which has a large effective piston area,
The large force that opposes the propeller thrust allows you to fine-tune the trim angle.

[Effects of the Invention] As described above, according to the present invention, when configuring a tilt device that performs a trim operation and a tilt operation, the tip of the piston rod of the tilt device is connected to a clamp bracket or a swivel bracket, and those brackets are connected. It is possible to perform trim operations without slidingly contacting the body, reduce the number of fluid pressure supply pipes, and simplify the operating circuit.

Furthermore, according to the present invention, when there is no propeller thrust, it is possible to quickly tilt up and down with a small force, and when propeller thrust is generated, a large force that opposes the propeller thrust can be used to adjust the trim angle to 6! ! I can adjust it.

[Brief explanation of drawings]

FIG. 1 is a side view showing an outboard motor to which an embodiment of the present invention is applied; FIG. 2 is a sectional view showing the tilt device of FIG. 1;
Fig. 3 (A) is an explanatory diagram of trim-up, Fig. 3 (B) is an explanatory diagram of tilt-up, Fig. 4 (A) is an explanatory diagram of tilt-down, Fig. 4 (B) is an explanatory diagram of trim-down, and Fig. 5 FIG. 5(A) is an explanatory diagram of the operation upon collision with driftwood, FIG. 5(B) is an explanatory diagram of restoration after collision with driftwood, and FIG. 6(A) is a sectional view showing a tilt device according to another embodiment of the present invention. FIG. 6(B) is an explanatory diagram of the operation at the time of collision with driftwood, FIG. 7 is an explanatory diagram showing the tilting operation of the tilt device according to another embodiment of the present invention, and FIG. 8 is an explanatory diagram of tilting up.
FIG. 9 is an explanatory diagram of tilt-down, FIG. 10 is an explanatory diagram of the trim operation of the tilt device of FIG. 7, No. 11Ug is an explanatory diagram of trim-up, and FIG. 12 is an explanatory diagram of tilt-up following trim-up. DESCRIPTION OF SYMBOLS 11... Hull, 12... Clamp bracket, 14... Swivel bracket, 18... Tilt device, 19 River housing, 20... Tilt piston, 21... Piston rod, 22... Trim Piston, 23...Small diameter cylinder chamber, 24...Large diameter cylinder chamber, 28...Through passage, 29...Seal surface, 30...Spring, 218...Tilt device, 219... Communication path, 220... Valve device, 221... Check valve, 222... Unload valve. Agent Patent Attorney Osamu Shiokawa Figure 5 (A) Figure 6 Figure 7 =) Tilt down Figure 10 → Trim, tilt up, retilt, trim down

Claims (2)

[Claims] (1) In a tilt device for a marine propulsion device that is interposed between a clamp bracket on the hull side and a swivel bracket on the propulsion unit side, a small diameter cylinder chamber and a large diameter cylinder chamber are connected in series, and the clamp bracket and a housing used in conjunction with one of the swivel brackets;
A small-diameter tilt piston is reciprocatably housed in a small-diameter cylinder chamber of a housing, and an end that is connected to the tilt piston and projects from the small-diameter cylinder chamber of the housing is connected to the other of a clamp bracket and a swivel bracket. The piston rod is housed in a large-diameter cylinder chamber of the housing so as to be reciprocally movable, and includes a through-path for applying fluid pressure in the large-diameter cylinder chamber to an end surface of the tilt piston opposite to the piston rod, and around the through-path. It has a sealing surface that comes into close contact with the end surface of the tilt piston on the side opposite to the piston rod, and also has a large-diameter trim piston that is constantly applied with an acting force toward the small-diameter cylinder chamber, so that the small-diameter cylinder chamber and the large-diameter cylinder chamber are connected to each other. A tilt device for a marine propulsion device, characterized in that it is configured such that a fluid pressure circuit can be connected to each of the cylinder chambers. (2) The housing is provided with an intermediate chamber that can communicate with the large-diameter cylinder chamber between the tilt piston and the trim piston, and the intermediate chamber can communicate with a fluid reservoir via a communication passage. The valve device is arranged, and the valve device is
(a) allow fluid flow from the fluid reservoir to the intermediate chamber when the pressure in the intermediate chamber is less than the pressure in the fluid reservoir; and (b) increase the diameter when the pressure in the intermediate chamber is greater than the pressure in the fluid reservoir. 2. The tilt device for a marine vessel propulsion device according to claim 1, wherein the tilt device is configured to allow fluid to flow from the intermediate chamber to the fluid reservoir only when the pressure in the cylinder chamber is greater than a predetermined value.