US3842789A - Hydraulic trim/tilt system for outboard propulsion units - Google Patents

Hydraulic trim/tilt system for outboard propulsion units Download PDF

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US3842789A
US3842789A US00317062A US31706272A US3842789A US 3842789 A US3842789 A US 3842789A US 00317062 A US00317062 A US 00317062A US 31706272 A US31706272 A US 31706272A US 3842789 A US3842789 A US 3842789A
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chamber
cylinder
valve
piston
manually movable
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K Bergstedt
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Volvo Penta AB
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Volvo Penta AB
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H20/00—Outboard propulsion units, e.g. outboard motors or Z-drives; Arrangements thereof on vessels
    • B63H20/08—Means enabling movement of the position of the propulsion element, e.g. for trim, tilt or steering; Control of trim or tilt
    • B63H20/10—Means enabling trim or tilt, or lifting of the propulsion element when an obstruction is hit; Control of trim or tilt
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/024—Systems essentially incorporating special features for controlling the speed or actuating force of an output member by means of differential connection of the servomotor lines, e.g. regenerative circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/2053—Type of pump
    • F15B2211/20561—Type of pump reversible
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/27—Directional control by means of the pressure source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
    • F15B2211/3058—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve having additional valves for interconnecting the fluid chambers of a double-acting actuator, e.g. for regeneration mode or for floating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/329—Directional control characterised by the type of actuation actuated by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41527—Flow control characterised by the connections of the flow control means in the circuit being connected to an output member and a directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/46—Control of flow in the return line, i.e. meter-out control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50545—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using braking valves to maintain a back pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/515—Pressure control characterised by the connections of the pressure control means in the circuit
    • F15B2211/5157—Pressure control characterised by the connections of the pressure control means in the circuit being connected to a pressure source and a return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/61—Secondary circuits
    • F15B2211/613—Feeding circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/775—Combined control, e.g. control of speed and force for providing a high speed approach stroke with low force followed by a low speed working stroke with high force, e.g. for a hydraulic press

Definitions

  • tilt movement when the boat lies still and when no propeller thrust acts on the drive, a wide range of tilting is to be performed in a short time. Under this condition, only a relatively small force is needed.
  • the trimming movement when the boat is driven and the drive is subjected to the propeller thrust, a relatively greater force is needed to achieve the trimming movement.
  • the trim angle is small and a low speed of the trimming movement is desirable to permit accurate setting of the trim angle.
  • the fluid pressure delivered by the pump to the cylinder will act on the difference between the piston areas of the two chambers of the cylinder, i.e., on the cross-sectional area of the piston rod. Since this area is much smaller than the total piston area exposed to the chamber at the piston end of the cylinder, the fluid will cause a fast movement of the piston and little force, which is desired during tilting.
  • the cylinder-piston assembly is arranged, as in said US. Pat. No. 3,548,777, so that an outward movement of the piston rod causes an upward tilting of the drive unit.
  • the manually adjustable valve member is preferably coordinated to a known locking valve, which is connected to the reverse gear of the drive and adapted to lock the connection between the piston rod side of the cylinder and the tank when shifting from forward to reverse drive.
  • FIG. 1 is a side view of an inboard-outboard drive unit for a boat embodying the invention
  • FIG. 2 is a schematic view of a previous known hydraulic trim/tilt system with two cylinders
  • FIG. 3 is a schematic view of a second embodiment of the invention with a manually adjustable valve unit
  • FIGS. 4a, 4b, 4c and 4d are schematic views of the different positions of the manually adjustable valve unit.
  • FIG. 5 is a schematic side view of the adjusting mechanism for the valve unit in FIGS. 4 a-d.
  • This invention contemplates an outboard drive unit for a boat, such as the inboard-outboard unit shown in FIG. 1 as comprising an outboard leg 60 mounted for tilting on a pivot 61 to the boat transom 62.
  • the leg is arranged for steering, for example, as shown in US. Pat. No. 3,605,677 Bergstedt, and is provided with a cylinder 63 rockably connected to a fixed portion 64 of the boat or drive unit and with an extensible piston rod 36 pivotally connected to the leg, whereby extension of the rod causes rearward trimming or tilting movement ofthe leg about pivot 61.
  • a control cable or rod linkage 56, 58 leads from a housing 65 which may form an integral part of the cylinder and in which control valves of the system are contained.
  • a pump and fluid pump schematically shown at P is connected by means of fluid conduits schematically represented at 66 to supply pressure fluid to and receive return fluid from the control system.
  • a forward, neutral and reverse gear transmission of the unit is controlled by lever 67 linked to lever 56.
  • the known hydraulic system showed in FIG. 2 comprises a reversible pump 1 which can deliver fluid in both directions, and it is therefore connected to the sump tank 6 over two lines 2 and 3 with back pressure valves 4 and 5.
  • the pump is also connected to the sump tank via lines 7 and 8 comprising safety relief valves 9 and 10.
  • the lines 2 and 3 of which one acts as a suction line and the other as a pressure line depending on the pump direction of the pump 1, connect the pump to two regulating valve units 11 and 12, of which the first one 11 communicates, via the lines 13 and 14, with the chamber 16 at the piston end of a double acting tilt cylinder 17 and also with a single acting trim cylinder 19 in order to regulate the fluid flow to and from these cylinders.
  • the other regulating valve unit 12 communicates, via the line 15, with the chamber 20 at the piston rod end of the double acting cylinder 17. Both valve units 11 and 12 also communicate with the sump tank via respective return lines 21 and 22. Units 11 and 12 comprise respective piston means 25 and 26, which are influenced by the pressure in lines 3 and 2 and which are spring biased by respective compression springs 23 and 24 against the pressure in the respective lines.
  • the piston means 25 controls the communication between sump return line 21 and lines 13 and 14 depending on the pressure in line 3, while piston means 26 controls the communication between sump return line 22 and line depending on the pressure in line 2.
  • the hydraulic system further comprises a lock valve 27, which is manually adjustable and is interposed in the line 15 which communicates with the chamber in cylinder 17.
  • the system also comprises a safety relief valve 29 in a short circuit line 28 connecting between lines 12 and 15.
  • Another safety relief valve is disposed in a channel in the piston 32, said channel connecting chambers 16 and 20 of the double acting cylinder to each other.
  • the system also comprises a line 33, which via a relief valve 48 connects line 13 to the sump tank.
  • the described system suffers of very little, actually neglectable, leakage and keeps the pistons 32 and 34 of the cylinders 17 and 19 in their adjusted positions.
  • the hydraulic cylinders are adapted to act between a stationary part of the boat and the tiltable part of the drive unit in such a way that an outward movement of the respective piston rods 35 and 36 causes an upward swinging movement of the drive. This arrangement, being well known in the art, is therefore not further shown in the drawings.
  • the pump When the angular position of the drive unit is to be adjusted, for upward or downward tilting or trimming, the pump is actuated and connected in the desired direction until the desired position of the drive unit is achieved.
  • the pump is actuated and connected in a direction which makes the line 3 constitute a suction line and the line 2 a pressure line.
  • the pressure in line 2 opens a spring biased back pressure ball valve 37 in the regulating valve unit 11, whereupon the fluid under pressure is delivered to chambers 16 and 18 in the cylinders 17 and 19 via lines 13 and 14.
  • the pressure in line 2 causes the piston 26 in the regulating valve unit 12 to move to the right as seen in FIG. 2 and thus to force open a back pressure valve 38 in the valve unit 12, whereupon chamber 20 in the cylinder 17 communicates with the sump tank 6 via the line 15 and the return line 22.
  • the trimming cylinder has a relatively short stroke.
  • the piston 32 of the cylinder 17 has a smaller area than the piston 34 of cylinder 19 and as the same pressure prevails in the cylinder chambers 16 and 18, a fast outward movement of the piston rod 35, and thus a fast tilting of the drive, is achieved after the piston 34 has reached its limit.
  • the rod 36 is so arranged that the outboard leg swings away therefrom beyond the trim range.
  • the pressure in line 3 causes piston 25 in the valve unit 11 to open a spring biased back pressure valve in the valve unit 11, whereupon the cylinder chambers 16 and 18 communicate with the tank 6 via the line 13, the back pressure valve 40 and the return line 21.
  • a spring biased back pressure valve in the valve unit 11 communicates with the tank 6 via the line 13, the back pressure valve 40 and the return line 21.
  • the cylinder 17 When the boat is propelled, whereby the piston rods 35 and 36 are exposed to the force caused by the propeller thrust which tends to press the pistons inwardly, the cylinder 17, due to its small piston area, is not able to produce an outwardly directed force which is enough to overcome the propeller force and accomplish a short movement of the drive for trimming.
  • the short movement of the drive is instead accomplished primarily by the cylinder 19 with the piston 34 which has a larger piston area, assisted to some extent by the lesser force of piston 32.
  • the cylinder 19 is preferable positioned so that a relatively long moment arm is obtained, which is made possible by the fact that only a relatively short swinging motion is needed for trimming compared with tilting.
  • the cylinder 17, however, is positioned so that a relatively short moment arm is obtained, in order to get a fast and wide swinging movement.
  • valve 27 works as a lock valve which is manually adjustable together with the gear mechanism of the drive in order to block the drainage from the cylinder chamber 20. In this way it is ensured that the drive will not be tilted by the rearwardly directed propeller force during reverse drive.
  • the valve 29 is a safety release valve which permits drainage of the chamber 20 if the drive is exposed to an extreme rearwardly directed force, for example upon impact with a submerged or floating object.
  • Valve 30 has the same function when the lock valve 27 is in its locking position.
  • FIGS. 3, 4a, 4b, 4c, 4d, and 5 The hydraulic system according to the invention will hereafter be described with reference to FIGS. 3, 4a, 4b, 4c, 4d, and 5 in which the components corresponding to those in FIG. 2 have been given the same numbers as in FIG. 2.
  • the system showed in FIG. 3 connects at fluid lines 13, 15 and 33 to the system as shown in FIG. 2.
  • the difference between the system according to this invention as shown in FIG. 3 and the prior art system of FIG. 2 lies, as will be seen, in the omission of cylinder 19, in the substitution of valve 50 for valve 27, and in the provision of short circuit line 52. Furthermore, since in the FIG.
  • the cylinder 17 performs the tilting function and the function of preventing tilting movement of the outboard leg during operation in reverse gear, whereas cylinder 63 according to the invention performs these functions as well as the function of trimming the leg during forward driving of the boat, the cylinder 63 should be of larger dimensions, for a drive unit of the same power, than are required for the cylinder 17.
  • cylinder 63 may be identical to cylinder 17 as above described, being provided with a throughpiston safety valve 30 for the purposes hereinabove explained.
  • line 13 is pressurized when the pump is actuated to trim or tilt the outboard leg, while a sump return connection is opened to line 15.
  • line 15 is pressurized and line 13 is opened to a sump return line.
  • lines 13 and 15 are blocked off although, as described, the safety valves 48, 29 and 30 are provided to prevent excessive build-up of destructive pressures therein.
  • the manually actuated valve 50 controls or provides not only the reverse lock function (ascribed to valve 27 of the system of FIG. 2) but also control and selection of the trimming and tilting operations.
  • the valve 50 comprises a rotatably movable valve member 51, which is connected or coupled to the reverse gear control mechanism of the drive over a lost motion mechanism (FIG. 5) so that shifting of the gears of the drive unit between forward, reverse and neutral also causes an adjustment of the valve member 51.
  • the lost motion" mechanism is in the shown embodiment constituted by a control lever 56 with slots 55 in which pins 57 on the valve member 51 mesh. The slots are dimensioned so that a 30 lost motion of the control lever is provided before the member 51 is engaged.
  • the control lever is connected to the reverse gear control mechanism via a push-pull rod 58 or the like.
  • FIGS. 4a 4d Two positions of the valve member 51 are achieved in the neutral position of the drive gear and the control lever 56, namely: a first neutral position is achieved by shifting gears from forward drive to neutral, and a second neutral position is achieved by shifting gears from reverse drive to neutral.
  • the different positions of the valve member 51 are shown in FIGS. 4a 4d.
  • the chamber 20 of cylinder 63 communicates with the sump tank 6 via achannel 53 in the valve member 51 and via line 15.
  • the drive gear control is in position for forward drive.
  • the system is now adjusted for trimming. Upon actuation of pump 1 in one direction, the outboard leg is slowly and forceably trimmed aft, or upon such actuation in the opposite direction, it is slowly trimmed forwardly.
  • FIG. 4b there is shown said first neutral position which is obtained by a 60 clockwise adjustment of the control lever 56 from the position in which the drive gears are engaged for forward drive into the position in which the gears are in neutral.
  • This position of lever 56 is that shown in solid lines in FIG. 5.
  • the lost motion between the lever and the valve member 51 is 30.
  • the valve member is thus adjusted 30 but is still maintaining communciation between the chamber 20 and the sump tank and the system, consequently, is still in position for trimming as shown in FIG. 4b.
  • the valve member 51 is adjusted 60 and blocks the drainage from chamber 20 as FIG. 40 shows.
  • the valve establishes communication between chambers 16 and 20 of the cylinder 63 via a channel 54, the channel 53 and the short circuit line 52.
  • U.S. Patents having some pertinence in connection with the present invention include No. 3,003,724 Kiekhaefer; No. 3,434,448 Woodfill; No. 3,653,270 Bergstedt; and No. 3,581,702 Moberg, in addition to No. 3,548,777 identified above.
  • a hydraulic system for trimming and tilting of outboard drive unitsfor boats comprising pump means adapted to deliver hydraulic liquid from a liquid sump to a double acting cylinder-piston assembly, said cylinder-piston assembly being arranged between said tiltable drive unit and the boat or a stationary part of the drive, characterized by a valve unit, said valve unit being adjustable between a first position and a second position and comprising means for connecting said pump means to the chamber at the piston rod end of the cylinder and to the chamber at the piston end of the cylinder when said valve unit is in said first position to tilt said drive unit and for disconnecting said chamber at said piston rod end of said cylinder from said chamber at the piston end of said cylinder and for connecting said chamber at said piston rod end of said cylinder with said sump when said valve unit is in said second,
  • a double acting hydraulic cylinder-piston assembly including a piston rod and having a cylinder with a piston therein dividing the space in the cylinder into a first chamber at the piston end and a second chamber at the piston rod end of said cylinder, means connecting said cylinder and rod between said leg and said boat and spanning said axis, and a reversible pressure liquid pump connected to said first chamber, valve means connected to said sump and to each of said chambers adjustable between a first and a second position and comprising means for connecting said second chamber to said first chamber when in said first position to tilt said drive leg and for connecting said second chamber to said sump when in said second position to trim said drive leg, and manual control means for adjusting said valve means between its said two positions.
  • a drive unit for a boat including a hydraulic system for trimming and tilting an outboard drive leg about a horizontal tilt axis, said system comprising a hydraulic liquid sump, a double acting hydraulic cylinderpiston assembly including a piston rod and having a cylinder with a piston therein dividing the space in the cylinder into a first chamber at the piston end and a second chamber at the piston rod end of said cylinder, means connecting said cylinder and rod between said leg and said boat and spanning said axis, and a source of pressure liquid connected to said first chamber, said unit comprising a forward, neutral and reverse gear transmission and manually movable means for shifting said gears, said system being characterized by including valve means connected to said sump and to each of said chambers adjustable between a first and a second position and comprising means for connecting said second chamber to said first chamber when in said first position to tilt said drive leg and for connecting said second chamber to said sump when in said second position to trim said drive leg, and means coupling said valve means to said manually movable means for coordinate
  • valve means is further adjustable into a third position into which it is adjusted in response to movement of said manually movable means into the position to shift said gear transmission into reverse, and said valve means further comprises means for closing off said second chamber when in said third position.
  • said means connecting said valve means to said manually movable means includes a lost motion connection, and wherein, upon movement of said manually movable means to shift said transmission gears from reverse into neutral, said valve means is thereby adjusted into its said first position, and, upon further movement of said manually movable means to shift said transmission gears from neutral into forward gear, said valve means is adjusted thereby into its said second position, said lost motion connection being operative, upon return movement of said manually movable means from its forward gear position to shift said transmission gears into neutral, to render said connecting means inoperative to return said valve means into its said first position.
  • valve means is further adjustable into a third position into which it is adjusted in response to movement of said manually movable means into the position to shift said gear transmission into reverse, and said valve means further comprises means for closing off said second chamber when in said third position.
  • a drive unit for a boat including a hydraulic system for trimming and tilting an outboard drive leg about a horizontal tilt axis, said system comprising a hydraulic fluid sump, a double acting hydraulic cylinderpiston assembly including a piston rod and having a cylinder with a piston therein dividing the space in the cylinder into a first chamber at the piston end and a second chamber at the piston rod end of said cylinder, means connecting said cylinder and rod between said leg and said boat and spanning said axis, and a selectively operable pressure fluid pump means connected to said first chamber, said unit comprising a forward, neutral and reverse gear transmission and manually movable gear shift means for shifting said gears between forward, neutral and reverse, said system being characterized by including valve means connected to said sump and to each of said chambers adjustable between first, second, third and fourth positions, said valve means comprising means to open hydraulic connection between said second chamber and said first chamber when in said first position, to open hydraulic connection between said second chamber and said sump in said second and third positions, and closing off hydraulic

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
US00317062A 1971-12-21 1972-12-20 Hydraulic trim/tilt system for outboard propulsion units Expired - Lifetime US3842789A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE16407/71A SE350939B (enrdf_load_stackoverflow) 1971-12-21 1971-12-21

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US3842789A true US3842789A (en) 1974-10-22

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US00317062A Expired - Lifetime US3842789A (en) 1971-12-21 1972-12-20 Hydraulic trim/tilt system for outboard propulsion units
US00317061A Expired - Lifetime US3799104A (en) 1971-12-21 1972-12-20 Hydraulic trim/tilt system for outboard propulsion units

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US (2) US3842789A (enrdf_load_stackoverflow)
JP (2) JPS4869287A (enrdf_load_stackoverflow)
CA (2) CA960917A (enrdf_load_stackoverflow)
DE (1) DE2262459A1 (enrdf_load_stackoverflow)
FR (1) FR2170501A5 (enrdf_load_stackoverflow)
GB (1) GB1369530A (enrdf_load_stackoverflow)
IT (1) IT974176B (enrdf_load_stackoverflow)
SE (1) SE350939B (enrdf_load_stackoverflow)

Cited By (15)

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Publication number Priority date Publication date Assignee Title
US3999502A (en) * 1975-09-04 1976-12-28 Brunswick Corporation Hydraulic power trim and power tilt system supply
WO1981000547A1 (en) * 1979-08-27 1981-03-05 Eltra Corp Hydraulic trim tilt system for outboard propulsion units using a pressure amplifier
US4457725A (en) * 1979-08-27 1984-07-03 Kern Calvin V Hydraulic trim tile system for outboard propulsion units using a pressure amplifier
US4490120A (en) * 1982-12-20 1984-12-25 Brunswick Corporation Hydraulic trim-tilt system
US4702714A (en) * 1983-03-19 1987-10-27 Sanshin Kogyo Kabushiki Kaisha Tilt mechanism for marine propulsion device
US5007866A (en) * 1988-10-04 1991-04-16 Sanshin Industries Co., Ltd. Trimming/tilting system for marine propulsion unit
US5018994A (en) * 1989-08-03 1991-05-28 Sanshin Kogyo Kabushiki Kaisha Tilting/trimming system for marine propulsion unit
US5067919A (en) * 1988-10-12 1991-11-26 Sanshin Industries Co., Ltd. Tilting/trimming system for marine propulsion unit
US6015318A (en) * 1997-01-17 2000-01-18 Yamaha Hatsudoki Kabushiki Kaisha Hydraulic tilt and trim unit for marine drive
US6048234A (en) * 1997-03-07 2000-04-11 Yamaha Hatsudoki Kabushiki Kaisha Hydraulic tilt and trim unit for marine drive
US6558212B2 (en) 1998-08-20 2003-05-06 Sogi Kabushiki Kaisha Hydraulic tilt device for marine outboard drive
US12065230B1 (en) 2022-02-15 2024-08-20 Brunswick Corporation Marine propulsion control system and method with rear and lateral marine drives
US12110088B1 (en) 2022-07-20 2024-10-08 Brunswick Corporation Marine propulsion system and method with rear and lateral marine drives
US12134454B1 (en) 2022-07-20 2024-11-05 Brunswick Corporation Marine propulsion system and method with single rear drive and lateral marine drive
US12258115B2 (en) 2022-07-20 2025-03-25 Brunswick Corporation Marine propulsion system and joystick control method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1053083A (en) * 1975-04-24 1979-04-24 Charles B. Hall Hydraulically powered marine propulsion tilting system with automatic let-down assembly
CA1060724A (en) * 1976-03-24 1979-08-21 Charles B. Hall Hydraulically powered marine propulsion tilting and trimming system with memory
US4349041A (en) * 1979-08-20 1982-09-14 Nl Industries, Inc. Control valve system for blowout preventers
US4509405A (en) * 1979-08-20 1985-04-09 Nl Industries, Inc. Control valve system for blowout preventers
JPS56160296A (en) * 1980-05-14 1981-12-09 Aisin Seiki Co Ltd Marine propeller lifting device
JPS5795295A (en) * 1980-12-03 1982-06-14 Yamaha Motor Co Ltd Tilting lock device of outboard engine
US4395239A (en) * 1981-04-10 1983-07-26 Outboard Marine Corporation Hydraulic system for marine propulsion device with sequentially operating tilt and trim means
JPS58185397A (ja) * 1982-04-26 1983-10-29 Sanshin Ind Co Ltd 船舶推進機のチルトロツク装置
JPS58214495A (ja) * 1982-06-08 1983-12-13 Sanshin Ind Co Ltd 船舶推進機のチルトロツク装置
JPS59120596A (ja) * 1982-12-28 1984-07-12 Sanshin Ind Co Ltd 船舶推進機のチルトロツク装置
JPS59153694A (ja) * 1983-02-22 1984-09-01 Sanshin Ind Co Ltd 船舶推進機のチルト装置
JPS60116592A (ja) * 1983-11-29 1985-06-24 Sanshin Ind Co Ltd 船舶推進機のチルトロック装置
US4568292A (en) * 1983-12-05 1986-02-04 Outboard Marine Corporation Hydraulic assistance device for use in a steering system
US4605377A (en) * 1984-06-21 1986-08-12 Outboard Marine Corporation Manual lift means for marine propulsion device
JPH0270596A (ja) * 1989-06-12 1990-03-09 Yamaha Motor Co Ltd 船外機のチルトロック装置
JPH0659874B2 (ja) * 1989-12-16 1994-08-10 ヤマハ発動機株式会社 船外機のチルトロック装置
US5062349A (en) * 1990-03-19 1991-11-05 Baroid Technology, Inc. Fluid economizer control valve system for blowout preventers
JPH11278385A (ja) * 1998-03-31 1999-10-12 Showa Corp 船舶推進機用トリム・チルト装置
US7901258B1 (en) * 2007-11-30 2011-03-08 Brp Us Inc. Hydraulic system for a marine outboard engine
US7942711B1 (en) * 2008-01-09 2011-05-17 Brunswick Corporation Method for controlling a marine propulsion trim system
US10689027B2 (en) 2017-07-13 2020-06-23 Cnh Industrial America Llc Hydraulic steering system of a work vehicle

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
US3008445A (en) * 1958-08-04 1961-11-14 Herbert H Black Outboard motor lifting apparatus
US3241461A (en) * 1963-09-03 1966-03-22 Allis Chalmers Mfg Co Hydraulic control system
JPS4418364Y1 (enrdf_load_stackoverflow) * 1965-06-17 1969-08-07
GB1161105A (en) * 1966-02-08 1969-08-13 Volvo Penta Ab Hydraulic System for Boats for Controlling and Actuating a Tiltable Outboard Propeller Shaft Housing.
US3434448A (en) * 1967-01-12 1969-03-25 Brunswick Corp Combined impact damping and power lift mechanism for an outboard propulsion unit assembly

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3999502A (en) * 1975-09-04 1976-12-28 Brunswick Corporation Hydraulic power trim and power tilt system supply
WO1981000547A1 (en) * 1979-08-27 1981-03-05 Eltra Corp Hydraulic trim tilt system for outboard propulsion units using a pressure amplifier
US4457725A (en) * 1979-08-27 1984-07-03 Kern Calvin V Hydraulic trim tile system for outboard propulsion units using a pressure amplifier
US4490120A (en) * 1982-12-20 1984-12-25 Brunswick Corporation Hydraulic trim-tilt system
US4702714A (en) * 1983-03-19 1987-10-27 Sanshin Kogyo Kabushiki Kaisha Tilt mechanism for marine propulsion device
US5007866A (en) * 1988-10-04 1991-04-16 Sanshin Industries Co., Ltd. Trimming/tilting system for marine propulsion unit
US5067919A (en) * 1988-10-12 1991-11-26 Sanshin Industries Co., Ltd. Tilting/trimming system for marine propulsion unit
US5018994A (en) * 1989-08-03 1991-05-28 Sanshin Kogyo Kabushiki Kaisha Tilting/trimming system for marine propulsion unit
US6015318A (en) * 1997-01-17 2000-01-18 Yamaha Hatsudoki Kabushiki Kaisha Hydraulic tilt and trim unit for marine drive
US6048234A (en) * 1997-03-07 2000-04-11 Yamaha Hatsudoki Kabushiki Kaisha Hydraulic tilt and trim unit for marine drive
US6558212B2 (en) 1998-08-20 2003-05-06 Sogi Kabushiki Kaisha Hydraulic tilt device for marine outboard drive
US12065230B1 (en) 2022-02-15 2024-08-20 Brunswick Corporation Marine propulsion control system and method with rear and lateral marine drives
US12110088B1 (en) 2022-07-20 2024-10-08 Brunswick Corporation Marine propulsion system and method with rear and lateral marine drives
US12134454B1 (en) 2022-07-20 2024-11-05 Brunswick Corporation Marine propulsion system and method with single rear drive and lateral marine drive
US12258115B2 (en) 2022-07-20 2025-03-25 Brunswick Corporation Marine propulsion system and joystick control method

Also Published As

Publication number Publication date
CA960917A (en) 1975-01-14
AU5004972A (en) 1974-06-20
SE350939B (enrdf_load_stackoverflow) 1972-11-13
IT974176B (it) 1974-06-20
JPS5933756Y2 (ja) 1984-09-19
DE2262459A1 (de) 1973-07-05
JPS5598700U (enrdf_load_stackoverflow) 1980-07-09
CA965650A (en) 1975-04-08
FR2170501A5 (enrdf_load_stackoverflow) 1973-09-14
JPS4869287A (enrdf_load_stackoverflow) 1973-09-20
GB1369530A (en) 1974-10-09
US3799104A (en) 1974-03-26

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