JPS6332680B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ship propulsion device, and more specifically,
The present invention relates to a type of marine propulsion system in which a hydraulic cylinder-piston assembly for pitching and a cylinder-piston assembly for trimming are provided between a member attached to the hull and a propulsion assembly.

Such cylinder-piston assemblies for tilting and trimming are already known. However, in many of these types of devices, these cylinders, pistons,
Because the circuits supplying fluid to the assembly are not independent of each other, it is inevitable that once set, the trim position will be influenced and changed by the fluid flowing through the fluid supply circuit to the tilting cylinder/piston assembly. . On the other hand, it is known that the trim position is not affected by the liquid flowing into the liquid supply circuit of the cylinder-piston assembly for tilting, but in such a type, separate pumps are used for tilting and trimming. As a result, the entire device becomes large and the cost increases.

It is an object of the present invention to use a common pump for tilting and trimming, and to have a so-called memory characteristic in which the trim position is not affected by the liquid flowing through the liquid supply circuit of the cylinder-piston assembly for tilting. Our objective is to provide a propulsion system for ships with

The drawing shows a ship's propulsion system, schematically shown in the form of an outboard motor 11, which is attached to the hull 1.
5 and a propulsion assembly connected to the member 13 for vertical oscillating movement between a fully lowered position and a fully raised position when the member 13 is connected to the hull 15; 17. For example, a swivel bracket 19 connected to member 13 for pivoting about a horizontal slanted pin 21;
Any suitable type of propulsion assembly may be used, including a propulsion unit 23 connected for steering movement relative to the propulsion assembly. The invention is equally applicable to stern drive units and outboard motors.

Between the member 13 and the propulsion assembly 17, the propulsion assembly 1 is connected relative to the member 13 mounted on the ship.
A hydraulic system 25 for tilting and trimming 7 is connected (FIG. 2). As used herein, the term "trimming" refers to an angular adjustment or movement within a trim range extending upwardly from a fully lowered position of the propulsion assembly 17, and the term "tilting" refers to an angular adjustment or movement within a trim range extending upwardly from a fully lowered position of the propulsion assembly 17, and the term "tilting" refers to an angular adjustment or movement within a trim range extending upwardly from a fully lowered position of the propulsion assembly 17; Refers to angular adjustment or movement within a range of tilt extending upwardly to a fully extended or raised position of assembly 17.

Hydraulic system 25 connects member 13 and propulsion assembly 17
and one or more hydraulic cylinder/piston assemblies 31, 33, one for trim and one for tilting, respectively. More specifically, the tilting cylinder-piston assembly 33 has opposed first and second ends 37,
39, the first end 37 is pivotally connected to one of the member 13 and the propulsion assembly 17;
5 houses an inclined piston 41 extending through second end 39 and connected to a piston rod 43 pivotally connected to the other of member 13 and propulsion assembly 17. A tilting cylinder and piston assembly 33 is connected between member 13 and swivel bracket 19, and a first end 37 of tilting cylinder 35 is pivotally connected to member 13 and piston rod 43 is connected to swivel bracket 19. Preferably, they are connected in a pivoted manner.

Trim cylinder piston assembly 31
has opposed first and second ends 47, 49;
A trim piston 51 is fixed to one of member 13 and propulsion assembly 17 and connected to a piston rod 53 that extends through second end 49 of trim cylinder 45. The other of elongate member 13 and propulsion assembly 17 is releasably engageable. Trim cylinder 45 is fixed to member 13 and piston rod 53
preferably releasably engages the universal bracket 19.

A one-way valve 61 of the type of a spring-loaded spherical check valve is positioned within the inclined piston 41;
The one-way valve prevents fluid from flowing from the first end 37 of the inclined cylinder 35 to the second end 39 but not from the second end 39 of the inclined cylinder 35 to the first end 39 of the inclined cylinder 35.
so that if the propulsion assembly 17 hits an underwater obstacle and the tilting cylinder 35 rapidly extends, the valve 61 allows the fluid to flow to the second end of the tilting cylinder 35. 39 through the inclined piston 41 to the first end 37 of the inclined cylinder 35. The load applied to the valve 61 is relatively high, for example, approximately 176 kg/cm ²
(2500psi).

The hydraulic system 25 also includes hydraulic fluid supply and control means for selectively supplying hydraulic fluid to the trim and tilt cylinder and piston assemblies 31,33. Although various means can be used, in the illustrated construction such means include a reservoir or sump 71 and a pump 73 operatively connected to the sump.
, a shuttle valve 75 connected to a pump 73, a shuttle valve and a tilt and trim cylinder 3.
5 and 45, respectively.

More specifically, the pump 73 has first and second fluid connections or ducts or ports 77, 79.
of the type of reversible motor having a duct or port 77 in which the first duct or port 77 supplies liquid under pressure and the second duct or port 77 supplies liquid under pressure when the pump is operating in one direction. Liquid fluid is supplied under pressure to the second duct or orifice 79 when the orifice 79 is in the suction state and the pump is operating in the opposite direction, and the first duct or orifice 77 is in the suction state. It is arranged so that Furthermore, the ducts or ports 77, 79 communicate with the reservoir 71 via conduits 81, 83, respectively.
In turn, conduits 81 and 83 include one-way valves 87 and 89 that allow fluid to flow to pump 73 but not to reservoir 71. Conduit 81, 8
3 preferably communicate with a reservoir or storage tank through a common filter 91.

Shuttle valve 75 includes a housing 93 having opposed first and second ends 95, 97, each of which is such that a first end 95 of the housing is under pressure when pump 73 is operating in one direction. The second end 97 of the housing communicates with ducts or ports 77 and 79, respectively, for pressurization when the pump 73 is operating in the other direction. The shuttle valve 75 also has a cylindrical portion housing a piston 99, which is connected to the housing 93.
from its center position to its first and second ends 95, 97
are movable to first and second positions near respective ones of.

Second end 97 of shuttle valve housing 93
A normally closed, spring-loaded valve 111 also communicates with the second end 49 of the trim cylinder 45 and the second end 39 of the tilt cylinder 35 via conduits 113 and 115, respectively. is connected to.
Communicating with the first end 95 of the shuttle valve housing 93 is another spring-loaded normally closed valve 121 .
This valve 121 communicates directly with the first end 47 of the trim cylinder 45 via a conduit 131.

The shuttle valve piston 99 is provided with means in the form of projections 123, 125 extending in opposite directions for opening the valves 121, 111, respectively, when it is positioned in the first and second positions. More specifically, when the first end 95 of the shuttle valve housing 93 is pressurized, the protrusion 125 opens the valve 111 and fluid flows between the second end 39 of the ramp cylinder 35 and the trim cylinder 45. second end 4
9 and into the housing 93.

Second end 97 of shuttle valve housing 93
When the trim cylinder 45 is pressurized, the protrusion 123 opens the valve 121 to allow fluid to flow from the first end 47 of the trim cylinder 45 into the housing 93.

When pump 73 is not operating, piston 99 is positioned in its central position and both valves 11 are closed.
1,121 are closed by their respective springs.

At the first end 37 of the inclined cylinder 35 there is a conduit 1
37 is in communication with the first end 9 of the shuttle valve housing 93 and includes a normally closed valve 139.
5 and thus effectively communicates with the first port 77 of the pump. Valve 139 releasably prevents fluid from flowing from first end 37 of ramp cylinder 35 in response to the presence of pressurized liquid in first port 77 of pump 73. from the first port hole 77 of the pump to the first port of the inclined cylinder 35.
end 37 of which is loaded for fluid flow.

Resisting a load on the valve 139 actuates the valve 139 to discharge the pump's first port from the first end 37 of the inclined cylinder 35 in response to the presence of liquid fluid under pressure in the second port 79 of the pump. Means are also provided for allowing hydraulic fluid to flow through the ports 77 of 1 . Although other constructions are possible, in the construction shown, the conduit 137 is routed through the first end 95 of the shuttle valve housing 93 to the pump first orifice 77.
and another portion 203 communicating with the first end 37 of the inclined cylinder 35 and an intermediate portion 205 between this portion.

In the illustrated configuration, the valve 139 is located at the intermediate portion 20 of the conduit 137, although other configurations may be used.
5 includes a valve seat 211 and a ball-shaped valve 139.
valve 139 with an open position allowing hydraulic fluid to flow to the valve 139;
a valve member 213 movable relative to the valve seat 211 between a closed position that prevents hydraulic fluid from flowing through the valve member 213 and a spring 215 that urges the valve member 213 toward the closed position;
Contains.

Although other configurations may be used, the illustrated configuration includes an intermediate portion 205 of conduit 137 and valve 1
39 and the valve actuation means are incorporated into a housing 231 which has a first end 2 in communication with a second port 79 of the pump via a conduit 237.
35 and a second end 239 communicating with intermediate portion 205 of conduit 137 . In the specifically illustrated configuration, conduit 137 communicates with pump second port 79 through valve 111 and second end 97 of shuttle valve housing 93. Furthermore, cylinder 233 is positioned between opposite ends 235 and 239 of valve member 213.
Piston 2 having a protrusion 243 extending toward
Contains 41. Piston 241 is cylinder 2
33 to a position that engages the valve member 213 and displaces the valve member 213 to an open position in response to the presence of pumped liquid fluid at the first end of the valve member 33. Furthermore, the piston 241 is connected to the cylinder 2
It is also movable away from the opening position of the valve member 213 in response to liquid fluid present under pump pressure at the second end 239 of the conduit 205, i.e. in the intermediate portion 205 of the conduit.

Hydraulic system 25 also automatically moves hydraulic fluid from first end 37 to second end 39 of ramp cylinder 35 to automatically lower propulsion assembly 17 after impacting an underwater obstacle. Includes lowering means. More specifically, the inclined cylinder 35
A self-pull assembly 151 is hydraulically connected between the first end 37 and the second end 39 of the valve, the assembly 151 being in the form of a normally closed, spring-loaded check valve. A conduit 154 communicates with the second end 39 of the inclined cylinder 35 and prevents hydraulic fluid from flowing into the second end 39 of the inclined cylinder 35 . It includes an actuated valve 153 arranged to releasably block or permit flow of hydraulic fluid therethrough. The load applied to valve 153 is, for example, approximately 176 kg/cm ² (2500 psi).

The pull-down assembly 151 also includes a pull-down valve 15.
5, the pull-down valve 155 has a first end 159 in communication with the valve 153 and a second end 161 in communication with a bypass valve 163 in the form of a normally closed, spring-loaded check valve. This bypass valve 1
63 on the other hand, portion 203 of conduit 137 and conduit 1
65 , and the conduit 137 communicates with the first end 37 of the inclined cylinder 35 . valve 163
For example, the load applied is approximately 1.76Kg/cm ²
(25psi), which is a relatively low value.

A pull-down piston 171 is positioned within the housing 157 of the pull-down valve.
is a first position near the first end of the pull-down valve housing 157 and a second position of the pull-down valve housing 157.
is movable between a first position and a spaced second position in a direction toward the end 161 of the holder. The pull-down piston 171 includes a restricted orifice or slot 172 communicating between first and second ends of the pull-down valve housing 157. Furthermore, the pull-down piston 171 is also the piston 171
includes a protrusion 173 operative to open valve 163 when moved to the second position to allow fluid to flow from first end 37 of ramp cylinder 35 into drawdown valve housing 157 .

Second end 161 of pull-down valve housing 157
and a second end 39 of the angled housing 35 , conduit means is in communication with a conduit 175 extending from about the second end 161 of the pull-down valve housing 157 to the sump 71 . Liquid reservoir 71
and a conduit 177 having a one-way valve 179 extending from the sump to the second end 39 of the inclined cylinder 35 to prevent hydraulic fluid from flowing toward the sump 71 and to permit flow away therefrom. conduit 17
7 includes the filter 91 described above.

Hydraulic system 25 also includes a normally closed overload or relief valve 191 that is connected to conduits 137, 16.
The propulsion assembly 17 is of the type of a normally closed, spring-loaded check valve in communication with the propulsion assembly 17.
Excessive thrust during operation will cause hydraulic fluid to flow from conduits 137, 165 to conduit 175 and from conduit 175 to conduit 137, thereby preventing hydraulic fluid from flowing into the first of inclined cylinders 35. The arrangement is such that the liquid flows from the end 37 of the liquid into the reservoir 71. Furthermore, when shuttle valve piston 99 is in a position to power upward movement of propulsion assembly 17, overload or relief valve 191 prevents movement of trim piston 51 or tilt piston 41 or prevents propulsion assembly 17 from moving upwardly. Overloading of pump 73 is prevented by bypassing hydraulic fluid to sump 71 whenever pump 73 is in a sufficiently raised position. It should be noted that the spring load on valve 191 is greater than the spring load on valve 139.

The hydraulic system 25 also includes a shuttle valve housing 9
3 includes a pressure relief valve 193 that communicates with the reservoir via a conduit 195 that communicates with the second end 97 of the shuttle piston 99 to prevent excessive Hydraulic fluid is operative to flow from the second end of shuttle valve housing 93 to sump 71 when pressure is developed. Furthermore, the pressure relief valve 193 also serves to prevent relatively high pressures due to shock absorption from adversely affecting the pump 73 when the shuttle valve piston 99 is in the position for powering the propulsion assembly 17. Pressure relief valve 193
The valve 111 is preferably of the spring loaded, normally closed check valve type and has a higher spring load than valve 111.

The hydraulic system 25 also includes a manual valve that connects the first and second ends 37, 39 of the tilt cylinder 35 to each other and bypasses fluid around the tilt piston 41 so that the propulsion assembly 17 can be raised and lowered by hand. 199 is also included.

When it is desired to power up propulsion assembly 17 in operation, pump 73 pressurizes first end 95 of shuttle valve housing 93 to displace piston 99 toward end 97 of shuttle valve housing 93. so that the adjacent valve 1
11 is actuated in the appropriate direction to open it.
At the same time, the pump pressure causes the other spring 121 to open against its spring force and supply pressure fluid to the first end 47 of the trim cylinder 45 through the conduit 131.
Furthermore, this pressurized liquid fluid is routed through conduit 137.
and valve 139 to first end 37 of inclined cylinder 35 .

At the same time, hydraulic fluid near the second end 39 of the tilt cylinder 35 and the second end 49 of the trim cylinder 45 passes through conduits 113, 115 past the now open valve 111 and into the valve housing 93. It flows to the inlet of pump 73 via second end 97 and second duct or port 79 . Replenishment fluid is filled 7
1 through a conduit 83 and a check valve 89.

In the event of upward movement of the propulsion assembly 17 or protection at the end of such movement, the hydraulic fluid supplied by the sump 71 is connected to conduit 137 containing valve 139 and conduit 165 to act as a pressure relief valve. Flows back to sump 71 via overload valve 191 and conduit 175.

During powered lowering of propulsion assembly 17, pump 73 is actuated in the opposite direction to direct hydraulic fluid to the second
through the duct or port 79 of the shuttle valve housing 93 to the second end 97 of the shuttle valve housing 93 thereby opening the adjacent valve 111 and forcing the shuttle valve piston 99 into the first end 95 of the shuttle valve housing 93. Change the position near the valve 1
Open 21. Hydraulic fluid flows through valve 111 and conduit 113 to second end 49 of trim cylinder 45 thereby retracting piston rod 51 and through conduit 115 to second end 3 of tilt cylinder 35.
At 9, the flow ramp cylinder-piston assembly 31 is retracted.

Simultaneously, hydraulic fluid flows through conduit 237 and acts on piston 241 to displace piston 241 and resist the force of spring 215 to open valve 129 whereby hydraulic fluid flows into first end 3 of inclined cylinder 35.
7 to the pump 73 through the first port hole 77 of the pump.
Return to

Also, during powered lowering of propulsion assembly 17, hydraulic fluid from first end 47 of trim cylinder 45 returns to pump 73 via conduit 131 and valve 121 to pump first port 77 and then to pump 73.

If there is a guard against the movement of the propulsion assembly 17 or at the end of its movement when the propulsion assembly 17 is in the fully retracted position, the pump 73
The fluid pressure generated is returned to sump 71 through conduit 195 and pressure relief valve 193. Fluid is supplied from reservoir 71 to pump 73 via conduit 81 and check valve 87.

If the propulsion assembly 17 hits an underwater obstacle, the propulsion assembly 17 will move rapidly upwards to extend the tilted cylinder 35 and thus cause the liquid fluid near the second end 39 of the tilted cylinder 35 to rise to a relatively high level. Pressurize to pressure. Under such circumstances, the hydraulic fluid will flow to the second end 3 of the inclined cylinder 35.
9, through the valve 61, past the inclined cylinder 41, and the first
The end 37 of the flow cylinder 35 is allowed to extend. When pump 73 is not operating, shuttle valve piston 99 is in the center position and both valves 1
11 and 121 are closed. During the time that the second end 39 of the tilting piston 35 is under high pressure, such applied pressure is applied via the conduit 154 to open the valve 153 and direct a relatively small amount of high pressure fluid into the valve 1.
53 to the first end 159 of the pull-down valve housing 157, the fluid is effective to change the pull-down piston 171 from the first position to the second position.

When the ramp cylinder 35 is fully extended, the pressure condition at the second end 39 of the cylinder 35 is resolved and the valve 153 is closed again so that hydraulic fluid at the first end 159 of the pull-down valve housing 157 closes the valve 153. through the second end 3 of the inclined cylinder 35
9 and thereby temporarily hold the pull-down valve piston 171 in the second position to close the valve 163.
hold in open position.

When the propulsion assembly 17 reaches a fully raised position, it tends to drop either due to the shock it experiences in this position or simply due to the weight of the motor. Temporarily holding valve 163 open by pull-down valve piston 171 causes tilting piston 35 to retract and accordingly pull propulsion assembly 17 down. In this regard, contraction of the tilting cylinder 35 causes hydraulic fluid to overflow from the first end 37 of the cylinder, which overflow fluid is routed through the conduit 165 and the valve 163 to the second end 161 of the pull-down valve housing 157. The liquid then flows back to the liquid reservoir 71. At the same time, the second tilt cylinder 35
A widening space at the end 39 of the inclined cylinder 35 directs hydraulic fluid from the reservoir 71 through a conduit 177 containing a filter 91 and a one-way valve 179.
end 39 of the inclined cylinder 35 to keep the second end 39 of the inclined cylinder 35 fully filled with hydraulic fluid.

First end 159 of pull-down valve housing 157
With reference to hydraulic fluid contained in the fluid, such fluid is progressively passed through a restricted orifice or slot 172 to the second end 161 of the pull-down valve housing 157 and then via conduit 175 to the sump 71. flows. As the confined hydraulic fluid thus moves past the pull-down piston 171, the pull-down valve housing 157 is moved by the spring force that urges the pull-down piston 171 toward the closed position of the valve 163.
, so that the hydraulic fluid finally reaches the first end 159 of the inclined cylinder 35 .
After completing the movement from the end 37 of the liquid back into the reservoir 71, the valve 163 can be closed again. Therefore,
The hydraulic system 25 is again in a state where it can operate either up or down and is ready for other shocks.

The pressurization of the liquid fluid at the second end 39 of the angled cylinder 35 also acts to pressurize the liquid fluid at the first end 235 of the valve housing 231. This pressurization displaces the valve member 213 to the open position. However, because the liquid fluid at the first end 37 of the tilted cylinder 35 is not pressurized during the upward swing of the propulsion assembly 17, no fluid flows through the valve 139. As the propulsion assembly 17 begins its downward movement, the pressure of the hydraulic fluid at the first end 235 of the housing 231 is released and the spring 215 displaces the valve member 213 to the closed position and moves the piston 241 into the housing 231.
235. Therefore, valve 13
Although 9 is opened in response to hitting an underwater obstruction, substantially no hydraulic fluid flows through valve 139.

Trim cylinder 45 connects conduit 131 and valve 121
is connected to the first orifice 77 of the pump via and independently of the connection with the first orifice 77 of the pump via the conduit 137 and valve 139 of the incline cylinder 35, so that the incline cylinder It should be particularly noted that 35 is hydraulically isolated from the first end 47 of trim cylinder 45. Therefore, the flow of hydraulic fluid relative to the tilting cylinder 35 caused by hitting an underwater obstruction does not adversely affect the position of the trim piston 51. Therefore,
The trim piston 51 does not move while tilting or returning downward due to the impact, so the propulsion assembly 17
always returns to the preset position after receiving an impact. Also, since the valve piston 99 is in the center position and the valve 111 is in the closed position, the propulsion assembly 1
It should also be noted that the pump 73 is isolated from the relatively high pressure created at the second end 39 of the tilting cylinder 35 due to the sudden shock of the pump 7 by an underwater obstruction.

As is clear from the above description, in the present invention, the tilting cylinder-piston assembly 3
The valve 139, which allows flow in the direction of extension of the 3 but prevents flow in the opposite direction, is independent of the circuit supplying liquid to the trim cylinder-piston assembly 31, so that, for example, when the propulsion assembly is underwater The trim cylinder 45 is unaffected even if it were to hit an obstacle and lift up, thereby pressurizing the liquid in the second end 39 of the tilting cylinder 35 and thereby opening the valve 139. Therefore, even though a common pump is used for the tilting and trimming cylinders, the memory characteristics of the trimming cylinder can be ensured.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view of a ship's propulsion system having various features of the present invention, and FIG. 2 is a diagram of a hydraulic system incorporated in the ship's propulsion system shown in FIG. DESCRIPTION OF SYMBOLS 11... Propulsion device, 13... Member, 17... Propulsion assembly, 31... Trim cylinder/piston assembly, 33... Incline cylinder/piston assembly, 35... Incline cylinder, 3
7, 39... End of inclined cylinder, 45... Trim cylinder, 47, 49... Trim cylinder end, 51... Trim piston, 53... Piston rod, 71... Storage tank, 73... pump, 77,
79... Pump port hole, 87... Relief valve, 93...
... first valve actuation means, shuttle valve housing, 95, 97 ... end of shuttle valve housing, 99 ... shuttle piston, 111 ...
Third valve, 113...Third conduit means, 121...
...Second valve, 123, 125...Means provided on the shuttle piston, 131...Second conduit means, 137...First conduit means, 163...Bypass valve, 165...Additional conduit means , 191...
Relief valve, 211... Valve seat, 213... Valve member, 2
15... Spring, 231... Housing of the first valve actuating means, 233... Cylinder in housing 231, 235, 239... End of cylinder 233, 241... Piston in cylinder 233.

Claims (1)

[Scope of Claims] 1. A member attached to a ship's hull; a propulsion assembly connected to the member so as to be able to swing vertically in a state where the member is attached to the ship's hull; and between the member and the propulsion assembly. connected to the first
a tilting hydraulic cylinder and piston assembly including a tilting cylinder having a first end; a trim cylinder secured to one of the member and the propulsion assembly; a reciprocatable trim piston including a piston rod having a second end and a piston rod extending through one end thereof for releasably engaging the other of the member and the propulsion assembly; a hydraulic cylinder and piston assembly for trim having therein; first and second orifices having a liquid pressurized in the first orifice when operating in one mode; a reversible pump that supplies pressurized liquid to the second orifice and applies suction to the first orifice when operating in a second mode; and; communicating between the first end of the inclined cylinder and the first port of the pump;
the first port of the pump in response to the presence of pressurized liquid in the first port of the pump; a first valve comprising a valve seat and a valve member receiving a pressing force toward the valve seat for allowing liquid to flow from the mouth hole to the first end of the inclined cylinder; conduit means for communicating between the first end of the trim cylinder and the first orifice of the pump independently of the first valve; a portion communicating with the orifice and engaging the valve member, the pump resisting the pressing force in response to the presence of pressurized liquid in the second orifice of the pump; a piston for moving a valve member to permit liquid to flow from a first end of an inclined cylinder to a first orifice of a pump; 2. The pressing force is provided by a spring that presses the valve member against the valve seat, and the piston is
a first end communicating with a second port of the pump and a second end communicating with the first conduit means between the first valve and the first port of the pump; A propulsion device for a ship according to claim 1, which is housed in a cylinder section. 3. The cylinder portion and the valve seat are formed in a housing forming part of the first conduit means, and the valve member and the spring are also positioned within the housing. The ship's propulsion system described in . 4 including a relief valve communicating between the first conduit means and the reservoir and arranged to allow liquid to escape from the first conduit means to the reservoir if the pressure in the first conduit means exceeds a predetermined value; Claim 1
The propulsion system of the ship described in paragraph.