JPH07228296A - Tilt down working fluid circuit for trim tilt device - Google Patents

Abstract

PURPOSE:To stabilize tilt down operation through prevention of the occurrence of jerk phenomenon by a method wherein a throttle valve is installed in a flow passage through which the upper chamber of a tilt cylinder and release valve on the upper chamber side are intercommunicated. CONSTITUTION:A flow passage 46 on the cylinder first upper chamber side is communicated with the upper chamber 28B of a tilt cylinder 28 through a flow passage 47 on the cylinder second upper chamber extending to the upper chamber 28B side of the tilt cylinder 28. The flow passage 46 on the cylinder first upper chamber side and the flow passage 47 on the cylinder second chamber side are formed as an internal flow passage in a cylinder housing 20. An orifice 88 serving as a throttle part is located in a flow passage through which the flow passage 46 on the cylinder first upper chamber side and a release valve 43 on the upper chamber side. This constitution prevents the occurrence of jerk phenomenon to execute stable tilt down operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tilt-down working fluid circuit of a trim / tilt device applied to a propulsion device for ships.

[0002]

2. Description of the Related Art Conventionally, in a trim / tilt device applied to a marine propulsion device, for example, an outboard motor, a gear pump is installed above a tilt cylinder via an upper chamber side open valve and an upper chamber side check valve. Supplying hydraulic oil to the chamber, the lower chamber of this tilt cylinder can communicate with the suction side of the gear pump through the lower chamber side check valve of the lower chamber side opening valve, and is introduced from the operating valve of the upper chamber side opening valve. A hydraulic circuit is configured so that the hydraulic pressure of the hydraulic oil generated causes the hydraulic valve of the lower chamber side opening valve to open the lower chamber side check valve and guide the hydraulic oil in the lower chamber of the tilt cylinder to the suction side of the gear pump. There is.

[0003]

However, in the tilt down hydraulic circuit of the trim / tilt device as described above, when the outboard motor is in the vicinity of the horizontal state during the tilt down operation, the weight of the outboard motor is reduced. It works best on the piston rod of the tilt cylinder device. At this time, there is a possibility that a jerk phenomenon may occur in which the piston rod is intermittently lowered (stored in the tilt cylinder).

That is, when an excessive load is applied to the piston rod of the tilt cylinder device from the outboard motor during the tilt-down operation, the hydraulic pressure in the lower chamber of the tilt cylinder rises, and this hydraulic pressure opens the check valve on the lower chamber side. Act to speak. Also,
At this time, the volume of the upper chamber of the tilt cylinder rapidly increases, the amount of hydraulic oil supplied from the gear pump becomes insufficient, and the hydraulic pressure in the upper chamber decreases. Then, the hydraulic oil supplied to the operating valve of the upper chamber side opening valve is insufficient, and the operating valve of the lower chamber side opening valve maintains the open state of the lower chamber side check valve of this lower chamber side opening valve. become unable. As a result of these, the lower chamber side check valve is closed,
The hydraulic oil does not flow from the lower chamber of the tilt cylinder to the suction side of the gear pump, and the lowering of the piston rod of the tilt cylinder device stops.

As described above, when the hydraulic oil does not flow out from the lower chamber of the piston cylinder, the hydraulic pressure in the upper chamber of the tilt cylinder rises and the hydraulic oil flows to the operating valve of the upper chamber side opening valve, and this operation is performed. The valve activates the operation valve of the lower chamber side open valve,
Open the lower chamber side check valve. As a result, hydraulic oil flows from the lower chamber of the tilt cylinder to the suction side of the gear pump,
The piston rod of the tilt cylinder device moves down.

In this way, the stopping and continuing of the lowering of the piston rod of the tilt cylinder device are repeated,
A jerk phenomenon in which the piston rod descends intermittently may occur, and the tilt-down operation may become unstable.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a trim / tilt device for a boat propulsion device which can prevent a jerk phenomenon and stably perform a tilt-down operation. And

[0008]

According to the present invention, a working fluid is supplied from a pump to an upper chamber of a tilt cylinder through an upper check valve of an upper opening valve of the upper chamber, and a lower chamber of the tilt cylinder is lowered. It is possible to communicate with the suction side of the pump through the lower chamber side check valve of the chamber side opening valve, and the operating valve of the lower chamber side opening valve by the working fluid introduced from the operating valve of the upper chamber side opening valve. Opens the lower chamber side check valve to guide the working fluid from the lower chamber of the tilt cylinder to the suction side of the pump.
In the tilt-down working fluid circuit of the tilt device, a throttle portion is installed in a flow path that connects the upper chamber of the tilt cylinder and the upper chamber side opening valve.

[0009]

Therefore, according to the tilt-down working fluid circuit of the trim / tilt device according to the present invention, the working fluid is supplied from the pump to the upper chamber of the tilt cylinder via the upper chamber side check valve of the upper chamber side opening valve. Even if the pressure in the upper chamber of the tilt cylinder decreases due to the weight of the marine propulsion unit during the tilt-down operation, the throttle is installed between the upper chamber of the tilt cylinder and the upper chamber side opening valve. , The working fluid pressure from the pump to the upper chamber side open valve can be always maintained properly. Therefore, the pressure of the working fluid appropriately acts from the operating valve of the upper chamber side opening valve to the operating valve of the lower chamber side opening valve, and the operating valve of the lower chamber side opening valve always operates the lower chamber side check valve. Hold the valve open. Therefore, since the working fluid always flows from the lower chamber of the tilt cylinder to the suction side of the pump through the lower chamber side check valve, the piston rod of the tilt cylinder device can be smoothly housed in the tilt cylinder. Therefore, the jerk phenomenon during the tilt-down operation is prevented, and the smooth tilt-down operation can be realized.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing an outboard motor equipped with a trim / tilt device to which an embodiment of a tilt-down working fluid circuit of a trim / tilt device according to the present invention is applied. FIG. 2 is a hydraulic circuit diagram of the trim / tilt device of FIG. 3A is an overall front view showing the trim / tilt device of FIG. 1, and FIG. 3B is a view on arrow IIIA of FIG. 3A. 4 (A) is a front view showing the cylinder housing of FIG. 3 (A) with a part cut away.
4B is a view as seen from the arrow IVB in FIG. FIG. 5 is a view on arrow V in FIG. 4 (B). FIG. 6 is a view on arrow VI of FIG. FIG. 7 is a sectional view taken along line VII-VII of FIG. FIG. 8 is a sectional view taken along the line VIII-VIII of FIG. FIG. 9 is a sectional view taken along line IX-IX in FIG. FIG. 10 is a sectional view taken along the line XX of FIG. FIG. 11 is a sectional view taken along line XI-XI of FIG. FIG. 12 is a sectional view taken along line XII-XII in FIG. FIG. 13 is a sectional view taken along line XIII-XIII in FIG. FIG. 14 (A) is a front view showing the pump unit of FIG. 3 (A), and FIG. 14 (B) is a right side view of the pump unit of FIG. 14 (A). 15 is the same as FIG.
It is an arrow plane view which follows the XV-XV line of (A). 16
FIG. 16 is a sectional view taken along line XVI-XVI in FIG. 15. FIG. 17 is a partial plan view of FIG. 15 with the filter removed. Figure 1
8 is a rear view of the gear pump case of FIG. Figure 1
9 is a sectional view taken along line XIX-XIX in FIG. Figure 20
FIG. 20 is a sectional view taken along line XX-XX in FIG. 19.

As shown in FIG. 1, in an outboard motor 10 as a marine propulsion device, a propulsion unit 13 including a propeller 11 and an engine 12 is pivotally supported by a swivel bracket 14 so as to be horizontally swingable. A swivel bracket 14 is pivotally supported by a clamp bracket 15 so as to be vertically tiltable. The clamp bracket 15 grips the hull 16 and is fixed to the hull 16, whereby the propulsion unit 13 can swing horizontally with respect to the hull 16 and can tilt vertically. The propeller 11 of the outboard motor 10 is rotated in the forward and reverse directions by the engine 12, and the hull 16 moves forward or backward.

The swivel bracket 14 of the outboard motor 10
A trim / tilt device 17 is installed between the clamp bracket 15 and the clamp bracket 15. By expanding and contracting the trim cylinder device 18 and the tilt cylinder device 19 of the trim / tilt device 17, the propulsion unit 13 of the outboard motor 10 is trimmed or tilted. The trim operation is to tilt the propulsion unit 13 against the thrust of the propeller 11 while the hull 16 is traveling to change the running attitude of the hull 16. In addition, the tilt operation is to tilt the propulsion unit 13 against its own weight when the ship is stopped or when the hull 16 is landed, so that the propulsion unit 13 is lifted above the water surface.

The trim / tilt device 17 is shown in FIG.
As shown in (A) and (B), the trim cylinder device 1
8 and the cylinder housing 20 that constitutes the tilt cylinder device 19, the pump unit 21 as a working fluid supply / discharge portion and the tank 22 are assembled by being fixed by a mounting bolt 23. The pump unit 21 supplies hydraulic oil as a working fluid to the trim cylinder device 18 and the tilt cylinder device 19, and the tank 22 stores the hydraulic oil from the trim cylinder device 18 and the tilt cylinder device 19.

In the trim cylinder device 18, a piston 25 is slidably arranged in each of the two trim cylinders 24, a cylinder cap 26 closes the openings of these trim cylinders 24, and the pistons are connected to the piston 25. The rod 27 is configured to penetrate the cylinder cap 26. Further, the tilt cylinder device 19 is shown in FIG.
As shown in FIG. 4A, a piston 28P (FIG. 2) is slidably arranged in the tilt cylinder 28, and a piston rod 29 connected to the piston 28P penetrates the cylinder cap 30. To be done. The cylinder cap 30 also closes the opening of the tilt cylinder 28. Reference numeral 28Q in FIG. 2 indicates a free piston.

The cylinder housing 20 is supported by the clamp bracket 15 by inserting a pivot bolt (not shown) into the pivot portion 20A of the cylinder housing 20 shown in FIGS. 3 (A) and 3 (B). Further, a shaft support portion 29A is formed at the tip of the piston rod 29 of the tilt cylinder device 19, and the shaft support portion 29A is supported by the swivel bracket 14 via a shaft support bolt (not shown). Further, the tip of the piston rod 27 of the trim cylinder device 18 can be brought into contact with the swivel bracket 14.

The trim cylinder 24 and the tilt cylinder 28 are integrally formed with the cylinder housing 20.
As shown in FIG. 3B, the lower chamber 2 of the trim cylinder 24
4A and the lower chamber 28A of the tilt cylinder 28 are formed so as to partially overlap each other in horizontal projection. Further, in the cylinder housing 20, a pump unit mounting surface 31 (FIG. 4B) and a tank mounting surface 32 (FIG. 6) are formed on both sides of the tilt cylinder 28. The pump unit 21 is mounted on the pump unit mounting surface 31, the tank 22 is mounted on the tank mounting surface 32, and the mounting bolt 23 is mounted as described above.
It is fixed directly using.

As shown in FIG. 3 (A), the pump unit 2
1 includes a motor 33 and a gear pump 34. As shown in FIG. 2, the gear pump 34 is communicated with the main oil chamber 37 of the lower chamber side opening valve 36 via the unit first lower chamber side flow path 35, and the lower chamber side reverse valve 36 of the lower chamber side reverse valve 36 is connected. Stop valve 38, unit second lower chamber side flow passage 39, cylinder first lower chamber side flow passage 4
0 and the cylinder second lower chamber side passage 41, the lower chamber 24A of the trim cylinder 24 and the lower chamber 2 of the tilt cylinder 28.
It is connected to 8A. Further, the gear pump 34 is communicated with the main oil chamber 37 of the upper chamber side opening valve 43 via the unit first upper chamber side flow path 42, and the upper chamber side check valve 44 of the upper chamber side opening valve 43, the unit first check valve 44. 2 Upper chamber side flow path 45, first cylinder
Through the upper chamber side flow path 46 and the cylinder second upper chamber side flow path 47, the tilt cylinder 28 is communicated with the upper chamber 28B. The upper chamber 24B of the trim cylinder 24 has the first tank flow path 4
8, the second tank channel 49 and the third tank channel 50 are communicated with the tank 22. A filter 51 is arranged in the third tank flow path 50. Further, one trim cylinder 24 has a cylinder first oil sump flow path 52,
It communicates with an oil sump chamber 54 formed in the pump unit 21 via the cylinder second oil sump flow path 53 and the unit first oil sump flow path 53A.

The oil sump chamber 54 is communicated with the gear pump 34 via a unit second oil sump flow path 55 and a unit third oil sump flow path 56 which are arranged in parallel. A filter 57 is arranged at a communication portion between the oil sump chamber 54, the unit second oil sump flow path 55, and the unit third oil sump flow path 56. In addition, the unit second oil sump flow path 5
5 and the unit third oil sump flow path 56 are each provided with a check valve 58 which allows only the flow from the oil sump chamber 54 to the gear pump 34 during operation. further,
In the unit third oil sump flow path 56, an orifice 59 is arranged between the filter 57 and the check valve 58. In addition, the oil sump chamber 54 and the unit first upper chamber side flow path 4
2 is connected via a flow path 42A, and the flow path 42A is provided with a relief valve 42B that opens when the discharge pressure of the pump becomes equal to or higher than a predetermined pressure.

In the unit second lower chamber side channel 39, the first
The communication passage 60 is branched, and the second communication passage 61 is branched to the unit second upper chamber side flow passage 45. The first communication passage 60 and the second communication passage 61 can be communicated with each other by the manual valve 63 of the manual valve unit 62. The manual valve 63 communicates with the oil sump chamber 54 via a unit fourth oil sump flow path 66 (described later). By manually opening the manual valve 63, the upper chamber 28B of the tilt cylinder 28 is moved to the oil sump chamber 5
4, the lower chamber 28A of the tilt cylinder 28 and the lower chamber 24A of the trim cylinder 24 are communicated with the oil sump chamber 54, respectively. Due to this communication, when the gear pump 34 becomes inoperable due to a failure or the like, the propulsion unit 1 of the outboard motor 10 is manually operated.
3 can be tilted up or tilted down.

Further, a filter 64 as a filtering means and a relief valve 65 are respectively connected to the first communication passage 60, and the relief valve 65 is communicated with the oil sump chamber 54 through the unit fourth sump flow path 66. . In the relief valve 65, the gear pump 34 is still rotating even after the tilt-up is completed, and the lower chamber 28A of the tilt cylinder 28 is
Also, when the pressure in the flow passages 40, 41 and 39 reaching these reaches a predetermined pressure or more, the valve is opened to let the working oil escape to the oil sump chamber 54 and protect the flow passage system.

The lower chamber side open valve 36 is a lower chamber side check valve 38,
The lower chamber side operation valve 67, the main oil chamber 37 and the sub oil chamber 68 are configured. Further, the upper chamber side opening valve 43 is configured to have the upper chamber side check valve 44, the upper chamber side operation valve 69, the main oil chamber 37 and the sub oil chamber 68. Then, the sub oil chambers 68 of the lower chamber side open valve 36 and the upper chamber side open valve 43 are
The open valve communication passages 70 communicate with each other. In addition, the lower chamber side operation valve 67 allows the lower chamber side check valve 38 to be opened by pressing the lower chamber side check valve 38 due to a pressure increase in the sub oil chamber 38 of the lower chamber side opening valve 36, and the upper chamber side operation valve 69 also moves upward. The pressure increase in the sub oil chamber 68 of the chamber side opening valve 43 pushes the upper chamber side check valve 44 to open the valve.

For example, when working oil flows from the unit first lower chamber side flow path 35 into the main oil chamber 37 of the lower chamber side opening valve 36, this working oil opens the lower chamber side check valve 38. While flowing into the unit second lower chamber side flow path 39, the lower chamber side operation valve 67 is also opened and flows into the sub oil chamber 68 of the upper chamber side open valve 43 through the open valve communication passage 70. At this time, since the upper chamber side operating valve 69 is in the closed state, the pressure in the sub oil chamber 68 of the upper chamber side opening valve 43 rises, and the upper chamber side operating valve 69 becomes the upper chamber side check valve 44. Open the valve. Even when the working oil flows from the unit first upper chamber side flow path 42 into the main oil chamber 37 of the upper chamber side opening valve 43, this working oil causes the upper chamber side check valve 44 to open and the upper chamber side. Operation valve 69 and lower chamber side operation valve 67
By this action, the lower chamber side check valve 38 of the lower chamber side open valve 36 is opened.

The tilting operation and trimming operation of the outboard motor 10 by the trimming / tilting device 17 will be described below with reference to FIG.

First, the tilt-up operation is carried out by rotating the gear pump 34 in the normal direction by the motor 33. That is, the gear pump 34 sucks the working oil from the unit second oil sump flow passage 55 as shown by the solid line arrow, and operates to the main oil chamber 37 of the lower chamber side open valve 36 via the unit first lower chamber side flow passage 35. Pump oil. Most of this hydraulic oil opens the lower chamber side check valve 38 to open the unit second lower chamber side flow passage 39, the cylinder first lower chamber side flow passage 40 and the cylinder second lower chamber side flow passage 41. Rear chamber 28 of tilt cylinder 28
A and the trim cylinder 24 flow into the lower chamber 24A. On the other hand, part of the hydraulic oil that has reached the main oil chamber 37 of the lower chamber side opening valve 36 opens the lower chamber side operating valve 67, and the sub oil chamber 68 and the opening valve communication passage of the lower chamber side opening valve 36. The sub-oil chamber 68 of the upper chamber side opening valve 43 is reached via 70, and the upper chamber side check valve 44 is opened via the upper chamber side operation valve 69. As a result, the upper chamber 28B of the tilt cylinder 28 has the cylinder second upper chamber side flow channel 47, the cylinder first upper chamber side flow channel 46, the unit second upper chamber side flow channel 45, and the unit first upper chamber side flow channel 42. Through the suction side of the gear pump 34. These results,
The piston rod 29 of the tilt cylinder device 19 advances (moves to the right side in FIG. 2) to tilt up the propulsion unit 13 of the outboard motor 10.

Next, the tilt-down operation is performed by rotating the gear pump 34 in the reverse direction by the motor 33. That is, the gear pump 34 sucks the working oil from the unit third oil sump flow path 56, and passes through the unit first upper chamber side flow path 42 to the main oil chamber 37 of the upper chamber side open valve 43, as shown by the broken line arrow. Pump hydraulic fluid. Most of this hydraulic oil opens the upper chamber side check valve 44 to open the unit second upper chamber side flow passage 45, the cylinder first upper chamber side flow passage 46 and the cylinder second upper chamber side flow passage 47. Upper chamber 28 of tilt cylinder 28
Flow into B. On the other hand, the main oil chamber 3 of the upper chamber side opening valve 43
Part of the hydraulic oil reaching 7 opens the upper chamber side operating valve 69, passes through the sub oil chamber 68 of the upper chamber side opening valve 43 and the opening valve communication passage 70, and becomes the sub chamber of the lower chamber side opening valve 36. The oil chamber 68 is reached, and the lower chamber side check valve 38 is opened via the lower chamber side operation valve 67. As a result, the lower chamber 28A of the tilt cylinder 28 is moved to the cylinder second lower chamber side flow passage 41 and the cylinder first lower chamber side flow passage 4
0 and the unit second lower chamber side flow path 39 to communicate with the suction side of the gear pump 34. As a result, the piston rod 29 of the tilt cylinder device 19 is housed in the tilt cylinder 28 (moved to the left side in FIG. 2), and the propulsion unit 13 of the outboard motor 10 is tilted down.

When tilting down, the gear pump 34
Lower chamber 28 of the tilt cylinder 28 that is returned to the suction side of the
The hydraulic oil in A is larger than the hydraulic oil in the upper chamber 28B by the amount of the piston rod 29 entering the upper chamber 28B. Therefore, the hydraulic oil discharged from the gear pump 34 is corresponding to that amount. 42B to open the oil reservoir 54
Returned inside.

Next, the trim-up operation is carried out by rotating the gear pump 34 in the forward direction, similarly to the tilt-up operation. That is, the operating oil flows from the lower chamber side check valve 38 of the lower chamber side opening valve 36 to the unit second lower chamber side flow passage 39, the cylinder first lower chamber side flow passage 40, and the cylinder second lower chamber side flow passage 4.
1 is supplied to the lower chamber 24A of the trim cylinder 24 and the lower chamber 28A of the tilt cylinder 28. At this time, since the upper chamber 24B of the trim cylinder 24 is communicated with the tank 22 via the first tank flow path 48, the second tank flow path 49 and the third tank flow path 50, the piston rod of the trim cylinder device 18 is 27 and the piston rod 29 of the tilt cylinder device 19 advance, and the propulsion unit 13 of the outboard motor 10 is trimmed up.

The trim down operation is carried out by reversing the gear pump 34 in the same manner as the tilt down operation. That is, the operating oil is the upper chamber side operating valve 69 of the upper chamber side opening valve 43 and the lower chamber side operating valve 6 of the lower chamber side opening valve 36.
7 is operated to open the lower chamber side check valve 38. As a result, the lower chamber 24A of the trim cylinder 24 communicates with the suction side of the gear pump 34 via the cylinder second lower chamber side flow passage 41, the cylinder first lower chamber side flow passage 40, and the unit second lower chamber side flow passage 39. Then, the piston rod 27 of the trim cylinder device 18 is pushed by the weight of the propulsion unit 13 of the outboard motor 10, is housed in the trim cylinder 24, and is trimmed down. At this time, the upper chamber 24 of the trim cylinder 24
The inside of B becomes a negative pressure, and the hydraulic oil in the tank 22 is introduced into the upper chamber 24B.

Finally, after the above tilt-up operation, when the propulsion unit 13 of the outboard motor 10 is mechanically locked in the tilt-up state, the piston rod 27 of the trim cylinder device 18 is moved to the trim cylinder 24 to prevent corrosion. It needs to be stored inside. The piston rod protection operation of the trim cylinder device 18 reverses the gear pump 34,
The lower chamber side check valve 38 is opened by the operation of the upper chamber side operating valve 69 of the upper chamber side opening valve 43 and the lower chamber side operating valve 67 of the lower chamber side opening valve 36 to open the lower chamber 24A of the trim cylinder 24. Is communicated with the suction side of the gear pump 34, the piston rod 27 of the trim cylinder 18 is housed in the trim cylinder 24 in the same manner as the trim down operation described above. At this time, the operation of the orifice 59 limits the amount of hydraulic oil flowing from the oil sump chamber 54 to the gear pump 34.
Suction of hydraulic oil from the lower chamber 24A of the trim cylinder 24 to the gear pump 34 is ensured.

Now, the pump unit 21 shown in FIG.
As shown in FIGS. 14A and 14B, the manifold 7
The motor 33 is bolted to the No. 1 and the manifold 71
The gear pump 34 is housed between the gear pump 34 and the gear pump case 72 (FIG. 17) that is fixed to the gear pump case 72 (FIG. 16, FIG. 1).
8, FIG. 19). The gear pump 34 is connected to the shaft 33A of the motor 33 via a joint 73. Also,
Motor 33, manifold 71 and gear pump case 7
The oil sump chamber 54 (FIG. 19) is surrounded by 2. A unit second oil sump flow path 55 and a unit third oil sump flow path 56 are formed so as to penetrate through the upper surface and the lower surface of the gear pump case 72, and the gear pump case 7
The filter 57 is capped on the upper surface of 2. Therefore, the hydraulic oil in the oil sump chamber 54 is filtered by the filter 57 and can flow into and out of the unit second oil sump flow path 55 and the unit third oil sump flow path 56.

Further, as shown in FIGS. 16 and 19, a lower chamber side open valve 36 and an upper chamber side open valve 43 are housed between the manifold 71 and the gear pump case 72. The lower chamber side check valve 38 of the lower chamber side opening valve 36 and the upper chamber side check valve 44 of the upper chamber side opening valve 43 are housed in a check valve recess 74 formed in the manifold 71. Further, the lower chamber side operating valve 67 of the lower chamber side opening valve 36 and the upper chamber side operating valve 69 of the upper chamber side opening valve 43 are housed in the operating valve recess 75 formed in the gear pump case 72.

In each of the lower chamber side check valve 38 and the upper chamber side check valve 44, a valve body 77 is slidably arranged in a valve case 76 having a substantially covered cylindrical shape.
The valve portion 78 of No. 7 can open and close the valve port 79. The valve port 79 is formed in the top portion 76A of the valve case 76. In addition, a valve spring 80 as an urging body is arranged in the valve case 76. One end of the valve spring 80 is supported by the valve main body 77 and the other end is supported by the valve receiver 81 as a receiving member, and the valve spring 80 applies an urging force in the valve port 79 closing direction to the valve main body 77.

The spring receiver 81 is press-fitted and fixed to the lower end of the valve case 76 in FIGS. 16 and 19. Therefore, by using this spring receiver 81, the valve body 77 and the valve spring 8 are provided in the valve case 76.
After accommodating and holding 0 to form an assembly, the assembly is fitted into the check valve recess 74 of the manifold 71. A seal material 82 is attached around the valve portion 78 of the valve body 77. The sealing material 82 liquid-tightens the space between the valve portion 78 and the valve port 79 when the valve portion 78 closes the valve port 79.

The lower chamber side operating valve 67 and the upper chamber side operating valve 6
Each of 9 is configured such that an operating valve ball 84 is built in a spool 83 having an open upper portion, and the spool 83 is slidably arranged in an operating valve recess 75. Spool 83
A spool channel 85 is formed in the lower part of the valve so that the operating valve ball 84 can close the spool channel 85. Further, the lower end of the spool flow path 85 has a lower chamber side check valve 38,
The upper chamber side check valve 44 can be closed by a valve portion 78 of a valve body 77. Therefore, the spool channel 85 is
The operating valve ball 82 and the valve portion 78 are configured to be closed.

The lower chamber side check valve 38 and the upper chamber side check valve 44 have a top portion 76A of the valve case 76 and the lower chamber side operation valve 6
7, the main oil chamber 37 of the lower chamber side opening valve 36 and the upper chamber side opening valve 43 is surrounded by the spool 83 of the upper chamber side operating valve 69. A through hole 86 is formed in the valve case 76, and the main oil chamber 37 of the lower chamber side opening valve 36 is connected to the unit first lower chamber side flow passage 35 and the upper chamber side opening valve 43 through the through hole 86. The main oil chamber 37 is the unit first upper chamber side flow path 42.
The hydraulic oil can be supplied from the gear pump 34 into the respective main oil chambers 37.

Further, the lower chamber side operation valve 67 and the upper chamber side operation valve 6
Surrounded by the spool 83 of No. 9 and the operation valve recess 75, the sub oil chamber 68 of the lower chamber side open valve 36 and the upper chamber side open valve 43 is constituted. The operating valve ball 84 is built in the sub oil chamber 68. Further, the gear pump case 72 is formed with an opening valve communication hole 70 (FIG. 16) that communicates the two operation valve recesses 75. Through this open valve communication passage 70, the lower chamber side open valve 3
The sub oil chamber 83 of No. 6 and the sub oil chamber 83 of the upper chamber side opening valve 43 are communicated with each other.

Therefore, from the gear pump 34 to the unit first
When the hydraulic oil flows to the lower chamber side flow passage 35, the hydraulic oil reaches the main oil chamber 37 of the lower chamber side opening valve 36 through the through hole 86, as shown by the solid line in FIG. The lower chamber side check valve 38 is opened to flow from the valve port 79 to the unit second lower chamber side flow passage 39. At the same time, part of the hydraulic oil that has reached the main oil chamber 37 reaches the sub oil chamber 68 via the spool flow path 85 of the lower chamber side operation valve 67, and passes through the open valve communication passage 70 to open the upper chamber side open valve. It reaches the inside of the sub oil chamber 68 of 43, and presses the spool 83 of the upper chamber side operation valve 69. Then, the spool 83 presses the valve body 77 of the upper chamber side check valve 44 to open the upper chamber side check valve 44 and open the valve port 79 of the upper chamber side check valve 44. hand,
The unit second upper chamber side flow passage 45 and the unit first upper chamber side flow passage 42 (that is, the suction side flow passage of the gear pump 34) are in communication with each other.

On the contrary, when the working oil flows from the gear pump 34 to the unit first upper chamber side flow path 42, as shown by the broken line in FIG. 19, the working oil reaching the main oil chamber 37 of the upper chamber side opening valve 43 is reached. Opens the lower chamber side check valve 38, most of which flows to the unit second upper chamber side flow passage 45 through the valve port 79, and part of it flows into the spool passage of the upper chamber side operation valve 69. 85 to the sub oil chamber 68 of the upper chamber side opening valve 43
To The working oil that has reached the sub oil chamber 68 reaches the sub oil chamber 68 of the lower chamber side opening valve 36 via the opening valve communication passage 70, and presses the spool 83 of the lower chamber side working valve 67. Then, the spool 83 pushes down the valve body 77 of the lower chamber side check valve 38 to open the lower chamber side check valve 38, and the unit second lower chamber side flow passage 39 and the unit first lower chamber side flow passage 39. 35
(That is, the flow path on the suction side of the gear pump 34) is in communication.

By the way, the unit second lower chamber side flow passage 39 and the unit second upper chamber side flow passage 45 formed in the manifold 71 of the pump unit 21 are opened at the joint surface 87 shown in FIG. 14B. It Also, the pump unit 2
The unit first oil sump flow path 53A (FIG. 19) communicating with the first oil sump chamber 54 is also opened at the joint surface 47.
The cylinder unit first lower chamber side flow that directly communicates with the unit second lower chamber side flow passage 39 in the manifold 71 is provided on the pump unit mounting surface 31 (FIG. 4B) of the cylinder housing 20 to which the joint surface 47 is joined. The cylinder second oil in which the passage 40 directly communicates with the unit second upper chamber side passage 45 of the manifold 71 and the cylinder first upper chamber side passage 46 directly communicates with the unit first oil sump passage 53A of the manifold 71. The reservoir channels 53 are opened respectively.

First, the cylinder first lower chamber side flow passage 40.
4A, FIG. 7 and FIG. 8, and FIG. 9 and FIG. 10, are formed as internal flow passages along the longitudinal direction of the tilt cylinder 28, and the lower chamber 28 of the tilt cylinder 28 is formed.
It is connected to the cylinder second lower chamber side flow path 41 on the A side. The cylinder second lower chamber side channel 41 is formed as an internal channel orthogonal to the cylinder first lower chamber side channel 40, and as described above, the tilt cylinder 28 and the trim cylinder 24 are projected in the horizontal direction. It is formed at the overlapping location (Fig. 3
(B)). Further, the cylinder second lower chamber side flow passage 41 is
As shown in FIG. 3 (B) and FIG. 7, it extends in a straight line and communicates with the lower chamber 28A of the tilt cylinder 28 and the lower chamber 24A of the trim cylinder 24. Therefore, the lower chambers 28A and 24A are communicated with each other through the cylinder second lower chamber flow passage 41.

Further, the cylinder first upper chamber side flow path 46
As shown in FIG. 4A and FIG. 11, extends to the upper chamber 28B side of the tilt cylinder 28 and communicates with the upper chamber 28B of the tilt cylinder 28 via the second cylinder upper chamber side passage 47. The cylinder first upper chamber side flow path 46 and the cylinder second upper chamber side flow path 47 are also formed in the cylinder housing 20 as internal flow paths. An orifice 88 as a throttle portion is provided in the vicinity of the pump unit mounting surface 31 of the cylinder first upper chamber side flow path 46.

With this orifice 88, at the time of tilt down operation, from the gear pump 34 shown in FIG. 2 to the upper chamber 28B of the tilt cylinder 28 through the unit second upper chamber side flow passage 45, the cylinder first upper chamber side flow passage 46 and the like. The flowing hydraulic oil is limited, a predetermined amount of hydraulic oil flows into the main oil chamber 37 of the upper chamber side opening valve 43, and the inside of the main oil chamber 37 is always maintained at an appropriate pressure. As a result, the operation of the sub oil chamber 68 of the upper chamber side open valve 43 and the lower chamber side open valve 36 and the lower chamber side actuating valve 67 maintains the open state of the lower chamber side check valve 38 at all times, and the tilt cylinder The lower chamber 28A of 28 is the gear pump 3
No. 4 suction side flow path (unit first lower chamber side flow path 35) is always in communication.

Further, the cylinder second oil sump flow path 53
As shown in FIGS. 10 and 13, on the upper chamber 28B side of the tilt cylinder 28 in the cylinder housing 20,
It is bored in parallel with the cylinder first upper chamber side flow path 46. The second cylinder oil sump flow path 53 communicates with the upper chamber 24B of the one trim cylinder 24 via the first cylinder oil sump flow path 52. Like the cylinder second oil sump flow path 53, the cylinder first oil sump flow path 52 is also formed as an internal flow path in the cylinder housing 20. Since the upper chamber 24B of the two trim cylinders 24 is communicated with the first tank flow passage 48 (FIG. 9) as described later, the cylinder second oil sump flow passage 53 and the cylinder first oil sump flow passage 52 cause , The upper chamber 24B of both trim cylinders 24,
It communicates with the oil sump chamber 54 of the pump unit 21 via the unit first oil sump flow path 53A.

As shown in FIG. 6, the cylinder housing 2
The third tank channel 50 is opened in the tank mounting surface 32 of No. 0, and the third tank channel 50 is directly communicated with the tank 22. As shown in FIG. 9, the cylinder housing 20 is provided with a first tank flow path 48 that connects the upper chambers 24B of the two trim cylinders 24. Also, the cylinder first
As shown in FIG. 10, a second tank channel 49 is communicated with the upper chamber 24B of the other trim cylinder 24 to which the oil sump channel 52 is not communicated, and the second tank channel 49 is connected with the second tank channel 49 as shown in FIG.
The third tank flow path 50 shown in FIG. The third tank channel 50 is formed in the cylinder housing 20 on the upper chamber 28B side of the tilt cylinder 28, and is configured as an internal channel together with the first tank channel 48 and the second tank channel 49. Therefore, these first, second and third
The upper chambers 24B of both trim cylinders 24 are communicated with the tank 22 by the tank channels 48, 49, and 50. Furthermore,
The filter 51 is arranged near the tank mounting surface 32 in the third tank flow passage 50 (FIG. 12). Incidentally, FIG.
Reference numeral 92 in FIGS. 11, 12 and 13 indicates a blind plug.

As shown in FIGS. 19 and 20, the pump unit 21 includes a second unit unit in the manifold 71.
A first communication passage 60 that communicates with the lower chamber side flow passage 39, a second communication passage 61 that communicates with the unit second upper chamber side flow passage 45, and a unit first upper chamber side flow passage 42 and the oil sump chamber 54. A flow path 42A is formed in the flow path 42A, and the relief valve 90 is provided in the flow path 42A.
Is provided. The manual valve unit 62 is installed at a position where the first communication passage 60, the second communication passage 61, and the unit fourth oil sump flow passage 66 intersect. Here, the unit fourth oil sump flow path 66 is shown in FIGS.
As shown in FIG. 8, similarly to the unit second oil sump flow path 55 and the unit third oil sump flow path 56, the gear pump case 72 is perforated from the upper surface to the lower surface, and the opening is covered by the filter 57. .

The manual valve unit 62 is shown in FIG.
As shown in FIG. 3, the manual valve 63 has a relief valve 65 and a filter 64 installed at the tip of the manual valve 63. Manual valve 6
3 is a substantially cylindrical shape, and an external thread 89 is engraved on the outer periphery,
It is screwed into the female screw 90 of the manifold 71. The female screw 90 is engraved on the inner peripheral surface of a manual valve recess 91 formed in the manifold 71. Manifold 71
Is located on the outermost side of the manual valve 91.
1, a unit fourth oil sump flow path 66 is formed inside thereof, and a first communication path 60 is formed inside thereof. As described later, by loosening the male screw 89 of the manual valve 63 and the female screw 90 of the manifold 71,
The manual valve 63 moves in the direction of arrow A in FIG. 20 so that the second communication passage 61 and the unit fourth oil sump flow passage 66 can communicate with each other.

The relief valve 65 is a relief ball 9
3, a valve seat 94, a spring seat 95, and a spring 96. The valve seat 94 is attached to the filter base 97, and the filter 64 is interposed between the valve seat 94 and the filter base 97. The filter base 97 can be brought into contact with the bottom surface of the manual valve recess 91 via a seal 98, and a base flow path 99 communicating with the first communication passage 60 is bored in the filter base 97. Therefore, the hydraulic oil in the first communication passage 60 is guided to the filter 64 and filtered through the base flow path 99.

The valve seat 94 also includes a filter 64.
Sheet flow channel 100 that can communicate with the base flow channel 99 via
And a relief ball 93 is arranged in the opening of the sheet flow channel 100. The spring 96 is a spring housing hole 1 formed on the tip side of the manual valve 63.
01, which applies a biasing force to the relief ball 93 via the spring seat 95. This urging force allows the relief ball 93 to close the flow path of the seat flow path 100.

The male screw 89 of the manual valve 63 is slightly loosened with respect to the female screw 90 of the manifold 71 to move the manual valve 63 in the direction of arrow A in FIG. 12, whereby the biasing force of the spring 96 is weakened. As a result, when the lower chamber 28A of the tilt cylinder 28 communicating with the unit second lower chamber side flow passage 39 becomes higher than or equal to a predetermined pressure, the relief ball 93 brings the seat passage 100 into the communication state, and the relief valve 65 opens. Speak. As a result, the first communication passage 60 communicates with the unit fourth oil sump flow passage 66 through the first flow passage 99, the filter 64, and the seat flow passage 100, and through the notch groove 102 formed at the tip of the manual valve 63. To do. As a result, the lower chamber 28A of the tilt cylinder 28 communicates with the oil sump chamber 54 via the unit second lower chamber side flow path 39, and the tilt cylinder 28 and the like are protected from hydraulic pressure.

The male screw 89 of the manual valve 63 is most loosened with respect to the female screw 90 of the manifold 71, and the O-ring 103 fitted in the manual valve 63 is further moved in the direction of arrow A by the distance L in FIG. At this time, as described above, the second communication passage 61 is connected to the unit fourth oil sump flow passage 6
Connect to 6. At this time, the biasing force of the spring 96 of the relief valve 65 becomes the minimum, so that the first communication passage 6
0 and the unit fourth oil sump flow path 66 are also in a communication state.
Therefore, by maximally loosening the male screw 89 of the manual valve 63, the lower chamber 28A and the upper chamber 28B of the tilt cylinder 28 are in communication with the oil sump chamber 54, and the tilt cylinder device 19 can be manually operated.

According to the above embodiment, the tilt cylinder 28
The lower chamber 28A of the trim cylinder 24 and the lower chamber 24A of the trim cylinder 24 are formed in the cylinder housing 20.
1 is connected to the gear pump 34 of the pump unit 21, and the upper chamber 28B of the tilt cylinder 28 is pumped by the cylinder first upper chamber side flow passage 46 and the cylinder second upper chamber side flow passage 47 formed in the cylinder housing 20. A first tank flow path 48 (FIG. 9), a second tank flow path 49 (FIG. 12) and a third tank flow path 48 (FIG. 9) connected to the gear pump 34 of the unit 21 and further having the upper chamber 24B of the trim cylinder 24 formed in the cylinder housing 20. It is connected to the tank 22 by a tank channel 50, and also the trim cylinder 24 (see FIG.
0) Since the upper chamber 24B is connected to the oil sump chamber 54 of the cylinder housing 21 by the cylinder first oil sump flow path 52 and the cylinder second oil sump flow path 53 formed in the cylinder housing 20, the tilt cylinder 28
Also, it is possible to eliminate external exposed piping between the trim cylinder 24 and the pump unit 21 and the tank 22. Therefore, the cost can be reduced and the assemblability of the trim / tilt device 17 and the corrosion resistance of the flow path can be improved. Furthermore, it is possible to reliably prevent the externally exposed pipe from being torn and the pipe from being detached during operation.

Further, the tilt cylinder 28 (FIG. 3B)
Since the lower chamber 28A of the trim cylinder 24 and the lower chamber 24A of the trim cylinder 24 are communicated with each other by the linear second cylinder lower chamber side flow passage 41, both lower chambers 28A and 24A can be communicated with each other at the shortest distance. The resistance can be reduced. Of course, it is possible to easily process the flow path that connects the lower chambers 28A and 24A.

Further, at the time of a tilt down operation for supplying hydraulic oil from the gear pump 34 shown in FIG. 2 to the upper chamber 28B of the tilt cylinder 28 via the upper chamber side check valve 44 of the upper chamber side opening valve 43, the outboard motor is operated. With the weight of 10, the tilt cylinder 2
Even if the pressure in the upper chamber 28B of No. 8 is reduced, since the orifice 88 (FIGS. 11 and 2) is installed between the upper chamber 28B of the tilt cylinder 28 and the upper chamber side opening valve 43, the gear pump 34 To the upper chamber side opening valve 43 can always maintain an appropriate pressure of the hydraulic oil. Therefore, from the operation valve 69 of the upper chamber side opening valve 43 to the operation valve 67 of the lower chamber side opening valve 36.
The pressure of the hydraulic oil properly acts on the lower chamber side release valve 3
The operation valve 67 of 6 can always hold the lower chamber side check valve 38 open. Therefore, from the lower chamber 28B of the tilt cylinder 28 to the cylinder second lower chamber side flow passage 41 and the cylinder first lower chamber side flow passage 40.
And unit second lower chamber side flow path 39 and lower chamber side check valve 3
Since the hydraulic oil always flows to the suction side flow path (unit first lower chamber side flow path 35) of the gear pump 34 via 8, the piston rod 29 of the tilt cylinder device 19 is moved to the tilt cylinder 2
Can be stored in 8 without delay. Therefore, the jerk phenomenon of the tilt cylinder device 19 can be prevented from occurring, and a smooth tilt down can be realized. This effect is particularly beneficial in the trim / tilt device 17 applied to the heavy cylinder 10.

Further, the lower chamber side check valve 3 of the lower chamber side open valve 36
8 and the end portion of the valve spring 80 that applies a biasing force to the valve body 77 (FIG. 19) of the upper chamber side check valve 44 of the upper chamber side open valve 43 is fixedly supported by the valve case 76 using the spring receiver 81. Therefore, the lower chamber side check valve 38 including the valve case 76, the valve body 77, and the valve spring 80 is
The upper chamber check valve 44 can be integrally configured as a single assembly. Therefore, the lower chamber check valve 38 and the upper chamber check valve 44 can be easily attached to the check valve recess 74 formed in the manifold 71 of the pump unit 21. 38, the mountability of the upper chamber side check valve 44 can be improved.

Further, when the lower chamber side check valve 38 and the upper chamber side check valve 44 are mounted, a spring receiver 81
Place the valve spring 80 in the proper position on the valve case 76.
Since the lower chamber side check valve 38 and the upper chamber side check valve 44 do not malfunction, the lower chamber side check valve 3
8. The reliability of the upper chamber side check valve 44 can be improved.

Further, the lower chamber side operation valve 6 of the lower chamber side opening valve 36
7 and the upper chamber side operation valve 69 of the upper chamber side opening valve 43 are housed in the operation valve recess 75 of the gear pump case 72. Since the gear pump case 72 is relatively large, the lower chamber side operation valve 67 and the upper chamber side. The layout of the operating valve 69 can be set arbitrarily, and the layout can be made compact.

Further, in the manual valve unit 62 (FIG. 2), the flow path (unit second lower chamber side flow path 39, cylinder first lower chamber side flow) which communicates with the lower chamber 28A of the tilt cylinder 28 during tilt-up operation. When the pressure in the passage 40 and the cylinder second lower chamber side flow passage 41) becomes equal to or higher than a predetermined value, the relief valve 65 opens and the working oil in this flow passage is sent to the tank 22 via the oil sump chamber 54. Although the filter 64 (FIG. 20) is installed adjacent to the relief valve 65, impurities (such as dust and burrs) in the hydraulic oil are discharged by the filter 64 every time the filter 64 is discharged to the oil sump chamber 54.
Can be satisfactorily removed.

The manual valve 63 of the manual valve unit 62 is manually operated, and is installed in the trim / tilt device 17 at a location where it is easy to work. Since the relief valve 65 and the filter 64 are arranged at the tip of the manual valve 63, the filter 64 can be taken out together with the relief valve 65 by removing the manual valve 63. Therefore, the filter 64 can be easily replaced.

[0059]

As described above, the trim
According to the tilt-down working fluid circuit of the tilt device, the jerk phenomenon can be prevented and the tilt-down operation can be stably performed.

[Brief description of drawings]

FIG. 1 is a side view showing an outboard motor equipped with a trim / tilt device to which an embodiment of a tilt-down working fluid circuit of a trim / tilt device according to the present invention is applied.

FIG. 2 is a hydraulic circuit diagram of the trim / tilt device of FIG.

3 (A) is an overall front view showing the trim / tilt device of FIG. 1, and FIG. 3 (B) is a IIIB of FIG. 3 (A).
FIG.

FIG. 4 (A) is a front view showing the cylinder housing of FIG. 3 (A) with a part cut away, and FIG.
FIG. 4 is a view as seen from an arrow IVB in FIG.

FIG. 5 is a view on arrow V of FIG. 4 (B).

FIG. 6 is a view on arrow VI in FIG. 4 (A).

7 is a cross-sectional view taken along the line VII-VII of FIG. 4 (A).

FIG. 8 is a sectional view taken along the line VIII-VIII of FIG. 4 (B).

9 is a sectional view taken along line IX-IX in FIG. 4 (B).

10 is a sectional view taken along line XX of FIG. 4 (B).

11 is a cross-sectional view taken along line XI-XI of FIG. 4 (B).

12 is a sectional view taken along line XII-XII in FIG.

FIG. 13 is a sectional view taken along line XIII-XIII in FIG.

14 (A) is a front view showing the pump unit of FIG. 3 (A), and FIG. 14 (B) is FIG. 14 (A).
It is a right view of the pump unit of FIG.

FIG. 15 is a plan view taken along the line XV-XV in FIG.

16 is a sectional view taken along line XVI-XVI in FIG.

FIG. 17 is a partial plan view of FIG. 15 with the filter removed.

18 is a rear view of the gear pump case of FIG.

19 is a sectional view taken along line XIX-XIX in FIG.

20 is a sectional view taken along line XX-XX in FIG.

[Explanation of symbols]

 10 Outboard Motor 14 Swivel Bracket 15 Clamp Bracket 16 Hull 17 Trim / Tilt Device 18 Trim Cylinder Device 19 Tilt Cylinder Device 20 Cylinder Housing 21 Pump Unit 22 Tank 24 Trim Cylinder 28 Tilt Cylinder 24A Trim Cylinder Lower Chamber 28A Tilt Cylinder Below Chamber 24B Trim cylinder upper chamber 28B Tilt cylinder upper chamber 34 Gear pump 36 Lower chamber side opening valve 38 Lower chamber side check valve 43 Upper chamber side opening valve 44 Upper chamber side check valve 54 Oil sump chamber 62 Manual valve unit 63 Manual valve 64 Filter 65 Relief valve 67 Lower chamber side operating valve 69 Upper chamber side operating valve 70 Open valve communication passage 71 Manifold 72 Gear pump case 74 Manifold check valve recess 76 Valve case 77 Bar Lub body 79 Valve port 80 Valve spring 81 Spring receiver 83 Spool 84 Operating valve ball 88 Orifice 89 Manual valve male thread 90 Manifold female thread 91 Manual valve recess 93 Relief ball 94 Valve seat 95 Spring seat 96 Spring 97 Filter base

Claims (1)

[Claims] 1. A working fluid is supplied from a pump to an upper chamber of a tilt cylinder via an upper check valve of an upper release valve of the upper chamber, the lower chamber of the tilt cylinder being the lower chamber of the lower release valve. It is made possible to communicate with the suction side of the pump through a check valve, and the working fluid of the lower chamber side open valve causes the lower chamber side check valve to operate by the working fluid introduced from the working valve of the upper chamber side open valve. In the tilt-down working fluid circuit of the trim / tilt device that guides working fluid from the lower chamber of the tilt cylinder to the suction side of the pump by opening the upper chamber of the tilt cylinder and the upper chamber side open valve of the tilt cylinder. A tilt-down working fluid circuit for a trim / tilt device, characterized in that a throttle portion is installed in a communicating flow path.