US3711221A - Device for varying the pitch of propeller blades - Google Patents

Device for varying the pitch of propeller blades Download PDF

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Publication number
US3711221A
US3711221A US00044522A US3711221DA US3711221A US 3711221 A US3711221 A US 3711221A US 00044522 A US00044522 A US 00044522A US 3711221D A US3711221D A US 3711221DA US 3711221 A US3711221 A US 3711221A
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United States
Prior art keywords
pressure medium
slide
pressure
channel
shaft
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US00044522A
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English (en)
Inventor
B Almqvist
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Saab AB
Scania Vabis AB
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Saab Scania AB
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H3/00—Propeller-blade pitch changing
    • B63H3/06—Propeller-blade pitch changing characterised by use of non-mechanical actuating means, e.g. electrical
    • B63H3/08—Propeller-blade pitch changing characterised by use of non-mechanical actuating means, e.g. electrical fluid
    • B63H3/081—Propeller-blade pitch changing characterised by use of non-mechanical actuating means, e.g. electrical fluid actuated by control element coaxial with the propeller shaft
    • B63H3/082—Propeller-blade pitch changing characterised by use of non-mechanical actuating means, e.g. electrical fluid actuated by control element coaxial with the propeller shaft the control element being axially reciprocatable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H3/00—Propeller-blade pitch changing
    • B63H3/06—Propeller-blade pitch changing characterised by use of non-mechanical actuating means, e.g. electrical
    • B63H3/08—Propeller-blade pitch changing characterised by use of non-mechanical actuating means, e.g. electrical fluid
    • B63H2003/088—Propeller-blade pitch changing characterised by use of non-mechanical actuating means, e.g. electrical fluid characterised by supply of fluid actuating medium to control element, e.g. of hydraulic fluid to actuator co-rotating with the propeller

Definitions

  • the auxiliary cylinder includes a follow-up slide which cooperates with the transmission member.
  • the transmission member has inlet and outlet openings and a channel to conduct a pressure medium to and from the working cylinder.
  • the follow-up slide has inlet and outlet openings which cooperate with the openings in the transmission member so that control of the position of the working piston is determined by the position of the follow-up slide.
  • the present invention relates to a device for varying the pitch of the propeller blades in engine driven boats.
  • the rotating forces required for such adjustment are rather great even in boats with a relatively low engine power. Therefore, hydraulic adjusting devices are regularly used.
  • the hydraulic servo-motor which is used for this purpose is generally located in or adjacent to the boss for the propeller shaft. From a movement transmission device associated with the propeller blades a displaceable, reversal rod which is coaxial with the propeller shaft is connected to a working piston in a hydraulic working cylinder, to which hydraulic pressure medium is supplied.
  • a position valve or follow-up-valve In connection with this device a position valve or follow-up-valve is provided.
  • the follow-up-valve comprises a follow-up slide located in an auxiliary cylinder, said slide cooperating with an extension of the piston rod of said piston projecting from the opposite side of the piston.
  • This piston rod extension is provided with channels through which pressure medium is supplied to and removed from the working cylinder.
  • the channels are provided with inlet and outlet openings which lead to openings in the surface of the piston rod extension and which cooperate with corresponding openings in the slide of the follow-up-valve.
  • Said indication is, however, not reliable, because due to the great length of the link rod and the other mechanical transmission devices between the propeller blades and an indicator means, it has not been possible to avoid that said indication has been dependent of the temperature.
  • the present invention relates to a device for varying the pitch of the propeller blades in engine driven boats and the like by means of a hydraulic motor comprising a working cylinder provided with a working piston which through a mechanical transmission member imparts a movement to the propeller blades and an auxiliary cylinder with a follow-up slide which cooperates with a transmission device mechanically connected to the working piston, said transmission device having at least one channel for pressure medium through which the pressure medium is conducted to and from the working cylinder and inlet and outlet openings, respectively, connected to said channel for the pressure medium, said transmission member being slidably cooperating with the follow-up slide, said follow-up slide being displaceable in the auxiliary cylinder, said follow-up slide being further provided with inlet and outlet openings, respectively, for the pressure medium, said openings cooperating with the inlet and outlet openings respectively of the transmission member in such a manner, that the transmission device and consequently also the position of the working piston is determined by the position of the follow-up slide.
  • the invention is mainly characterized by the fact that the position of the follow-up slide is controlled by a control pressure medium which is active in a control pressure medium chamber in the auxiliary cylinder, the pressure of said control pressure medium being manually adjustable by means of a pressure control valve and also of a force which counteracts the pressure in the control pressure medium chamber.
  • FIG. 1 illustrates diagrammatically a pitch varying device for propeller blades according to this invention, as seen in longitudinal section,
  • FIG. 2 illustrates diagrammatically a device according to a further development of the invention
  • FIG. 3 illustrates diagrammatically a pressure control valve provided in the arrangement of FIG. 2 and
  • FIG. 4 illustrates a modified embodiment of the device according to theinvention.
  • the device according to FIG. 1 comprises a transmission rod 10 which may be located within the propeller shaft and concentrically with the latter and, by further transmission devices not shown, for example teeth provided on the rod and gear wheels arranged on the shafts of the propeller blades, may be arranged to transmit torsional movement to the propeller blades by longitudinal displacement of the rod 10 forwards and backwards.
  • the mechanical details for translating the axial movement of the rod or shaft 10 to change of the pitch of blades is not part of the present invention, the same being well known in the art.
  • attention is directed to the Ekman U.S. Pat. No. 3,534,703, issued Oct. 20, 1970. lt will be understood that both the propeller shaft and the rod 10 will be in rotation when the shaft is connected to the prime mover.
  • the piston rod 10 On the rod 10, there is a working piston 11 fastened.
  • the piston is slidable in a working cylinder 12 and is actuated at one side by a pressure medium in a working pressure medium chamber 13 and at the other side of a spring or the like 14.
  • a draining tube 15 At the side of the piston which is not exposed to pressure medium, there is a draining tube 15 provided, in order to remove pressure medium which may leak through the piston packing 16.
  • the piston rod 10 has an extension on the rear side of the piston and is provided with a concentric, channel 16 through which pressure medium is transmitted to the working side of the piston.
  • the piston rod has radial channels 17 through which pressure medium can stream out from the channel 16 and stream back again into the channel 16.
  • the extension of the piston rod projects into an auxiliary cylinder 18 and in this cylinder there is provided a displaceable follow-up slide 19.
  • the slide 19 is provided with a concentric bore 20 in which the piston rod is slidable.
  • pressure medium is supplied through a pump 22 which generates a I 1 high pressure, to a conduit 23 connected to the auxiliary cylinder 18 through an inlet opening 24. Pressure medium is removed through an outlet conduit 25 which is connected to an outlet opening 26. The outlet conduit 25 is connected to a return conduit 27 which leads to the pressure medium tank 21.
  • the slide 19 In connection with the inlet opening 24 for the pressure medium the slide 19 is provided with a pressure medium receiving annular channel 28 which through channels 29 leads to inlet openings 30 which normally are closed or substantially closed by the surface of the extension of the piston rod.
  • annular channel 31 in the slide 19 In connection with the outlet opening 26 there is, in a corresponding way, an annular channel 31 in the slide 19, said annular channel being connected to a channel 32 which has an opening 33 which is normally closed by the surface of the extension 10.
  • the piston rod extension 10 is provided with radial channels 34 leading from the concentric pressure medium channel 16 to the outer surface of the piston rod extension.
  • the opening of the radial channels 34 are located in the position illustrated in FIG. 1 i.e., just adjacent to the opening 30 of the channel 29 of the slide, so that by a very little displacement of the slide to the right or of the piston rod to the left there will be a connection between the channel 29 and the channel 34.
  • the piston rod extension 10 has a radial channel 35 leading from the concentric channel 16 to the surface of the piston rod extension. This channel cooperates with an opening 33 of the channel 32 of the slide 19. By the slightest displacement of the slide to the left or of the piston rod to the right from the position shown in FIG. 1 there will be connection between the channel '32 and the channel 35.
  • the piston rod extension 10 is provided with stoppers 36 and 37 which limit the displacement of the slide 19 relative to the piston rod extension.
  • the slide 19 is actuated at the right end thereof by a pressure spring 38 which is provided in an extension of the cylinder 18. On the left side the slide is actuated by control pressure from a pressure chamber 18.
  • Control pressure is supplied through the conduit 39 from the pump 22 through a pressure control valve 40.
  • the pressure in the chamber 18 is indicated by a manometer or pressure gauge 41.
  • the manometer 41 may be calibrated for directly indicating the pitch angle of the propeller blades because said angle is exactly defined by the pressure in the control pressure chamber 18 which will be understood from the following description.
  • FIG. 3 there is shown a pressure control valve 40 which is suitable to be used in connection with a device according to FIG. 1.
  • the pressure control valve comprises a valve house 49 with an inlet 50 for pressure medium and an outlet 52 to which the draining conduit 27 in FIG. 1 is connected and a second outlet opening 53 to which the conduit 39 in FIG. 1 is connected.
  • the valve house 49 has a cylinder 54in which a valve member 55 is slidable.
  • the valve member is actuated at the right end thereof by a weak pressure spring 56 and at the left end by a stronger pressure spring 57.
  • the pressure spring 57 is located in a space 58 which is a continuation of the cylinder 54 but which has greater diameter than the cylinder 54. To this space 58 the draining opening 52 is connected.
  • the pressure of the pressure spring 57 may be adjusted by a handle 59, which actuates a screw 60 against which'the pressure spring rests.
  • the device shown in FIG. 1 operates in the following way.
  • the position shown in FIG. 1 is stable as long as the pressure in the pressure chamber 18 is constant. If the pressure in the pressure chamber 18 increases by actuating the handle 59 of the pressure control valve 40 (the spring 57, FIG. 3, is tightened) the slide 19 will be displaced to the right against the action of the spring 38. Thereby, the channel 29 of the slide will be put in connection with the channels 34 on the piston rod extension 10 and pressure medium will flow into the pressure chamber 13 behind the working piston 11, through the channels 24,34,16,17. Now, the working piston 11 will be displaced to the right against the action of the spring 14. This displacement will continue until the channel 34 again is out of connection with the channel 29.
  • FIG. 2 there is shown a modified embodiment of the invention.
  • the corresponding reference numerals as in FIG. 1 have been used.
  • FIG. 1 The only difference between FIG. 1 and FIG. 2 is that in the device according to FIG. 2 the return pressure from the working cylinder is used as a control pressure for the adjustment of the slide 19 in the auxiliary cylinder.
  • the return channel 32 of the slide opens through the left end of the slide into the control pressure medium chamber 18.
  • the function of the device shown in FIG. 2 corresponds entirely to the function of the device shown in FIG. 1.
  • the pressure in the control pressure chamber 18 may be increased whereby the slide 19 will be displaced to the right.
  • pressure medium will be supplied to the cylinder space 13 in the working cylinder through the channels 23, 28,29,34,16,17.
  • pressure medium is supplied through the conduit 39 to the pressure control valve 40 and because the pressure from the spring 32 has been decreased by the adjustment of the control member 59, the slide has been displaced so much to the'left, that the channel has been opened to the space 58 and consequently, pressure medium streams into the space 58 and further through the conduits 52 and 27 to the pressure medium tank 21.
  • FIG. 4 there is illustrated a further embodiment, in which the working piston 11 is not actuated by any spring but by the pressure from pressure medium on both sides.
  • the piston rod 10 is provided with two parallel pressure medium channels and 71.
  • the channel 70 is connected by a radial channel 72 to the space 13 on the left side of the piston and the channel 71 through another radial channel 73 is in connection with a space 12 on the right side of the piston.
  • the slide 19 in the auxiliary cylinder 18 has three annular channels 74,75,76 in the surface which cooperates with the surface of the piston rod 10.
  • the two outer annular channels 74 and 76 are connected with each other through a channel 77. Further, said channels are connected to an outer annular channel 31 through a radial channel 78.
  • the middle, annular channel is connected to another outer annular channel 28 on the slide 19 by a channel 79.
  • a radial channel 80 is connected, which opens on the surface of the piston rod between the two annular channels 75 and 76.
  • another radi al channel 81 is connected, which opens on the surface of the piston rod between the annular channels 74 and 75 of the slide.
  • the device according to FIG. 4 operates in the following way.
  • the position illustrated in the drawing is stable. If the pressure in the control pressure chamber 18 is increased by actuating the handle means 59 of the pressure control valve, the slide 19 will be displaced slightly to the right in relation to the piston rod 10. Thereby a pressure medium transmitting connection will be established between the annular channel 75 and the channel 80 and also between the annular channel 74 and the channel 81. Then the working pressure medium will be introduced at the left side of the piston 11 through the following transmission path: The conduit 23, the annular channel 28, the channel 79, the annular channel 75, the channel 80, the channel 70, the channel 72.
  • the device according to the invention gives the advantages in comparison with arrangements hitherto known, that no extended mechanical link systems for the control device will be needed and a direct indication of the pitch angle of the propeller blades will be obtained without any mechanical transmission means of such dimensions, that the accuracy is affected by temperature variations.
  • the propeller shaft may also in this arrangement be made simpler because the device with the auxiliary cylinder 18 and the associated slide 19 will be arranged adjacent to the working cylinder 13 and the working piston 14 which in turn may be arranged in the propeller hub or very adjacent to the latter.
  • the counterforce which is acting on the piston and which in the device according to FIG. 1 and 2 is generated by a spring may be made as great as needed without use of a strong and heavy spring.
  • a device for varying the pitch of propeller blades mounted for rotation about a pitch change shaft comprising: an hydraulic motor having a piston connected to said shaft for movement therewith and slidable in a cylinder, means for changing the pitch of said blades upon movement of said shaft, an auxiliary cylinder having a follow-up slide positioned therein and having a pressure medium chamber adjacent an end face of said slide, said follow-up slide being slidably mounted on said shaft, said shaft having at least one channel extending longitudinally therein for conducting a pressure medium to and from the working cylinder, a pressure medium tank, control valve means mechanically independent of said slide for selectively admitting the pressure medium into said pressure medium chamber from said tank, the channel in said shaft being provided with inlet and outlet openings for access and egress of said pressure medium, said follow-up slide being displaceable in the auxiliary cylinder by pressure in the pressure medium chamber and also by axial movement of said shaft beyond a predetermined amount, said follow-up slide having inlet and outlet passageways adapted to cooperate
  • a device as claimed in claim 1 in which said passageways open into the pressure medium chamber, said pressure medium chamber being connected to a return conduit, said control valve means being in said return conduit, said control valve means having a spring actuated pressure control slide and an actuating handle whereby the pressure of the spring and also the return pressure of the pressure medium in the control pressure chamber are manually adjustable.
  • A'device as claimed in claim 1 in which said follow-up slide is biased toward said pressure medium chamber by a pressure spring.
  • a device as claimed in claim I in which the piston is actuated by pressure medium on one side thereof and by a spring force on the other side thereof.

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  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Actuator (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Hydraulic Motors (AREA)
US00044522A 1969-06-06 1970-06-08 Device for varying the pitch of propeller blades Expired - Lifetime US3711221A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8105/69A SE321160B (xx) 1969-06-06 1969-06-06

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US3711221A true US3711221A (en) 1973-01-16

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US00044522A Expired - Lifetime US3711221A (en) 1969-06-06 1970-06-08 Device for varying the pitch of propeller blades

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US (1) US3711221A (xx)
BE (1) BE751534A (xx)
DE (1) DE2027824A1 (xx)
FR (1) FR2050019A5 (xx)
GB (1) GB1310839A (xx)
NL (1) NL7008257A (xx)
SE (1) SE321160B (xx)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4020781A (en) * 1974-12-04 1977-05-03 Newage Engineers Limited Marine propulsion systems with variable-pitch screw propellers
US4028004A (en) * 1974-07-03 1977-06-07 Lips B.V. Feathering controllable pitch propeller
US4049363A (en) * 1974-07-13 1977-09-20 Gea Luftkuhlergesellschaft Happel Gmbh & Co. Kg Axial flow fan with adjustable blades
US4822243A (en) * 1986-04-18 1989-04-18 Dowty Rotol Limited Bladed rotor assemblies and control means therefor
US4863347A (en) * 1987-10-03 1989-09-05 Dowty Rotol Limited Bladed rotor assemblies
US6261062B1 (en) * 2000-01-17 2001-07-17 Brunswick Corporation Actuation system for a controllable pitch propeller
US20090180883A1 (en) * 2008-01-11 2009-07-16 Mt-Propeller Entwicklung Gmbh Hydraulically controlled variable pitch propeller
US20110142640A1 (en) * 2009-01-22 2011-06-16 Mitsubishi Heavy Industries, Ltd. Cylinder driving device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3819296A (en) * 1972-03-06 1974-06-25 Mitsubishi Heavy Ind Ltd Control for hydraulic machine having adjustable blades

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2244770A (en) * 1937-01-15 1941-06-10 Englesson John Elov Operating device for propellers, turbine wheels, and pump wheels having rotatable blades
US2255920A (en) * 1937-02-01 1941-09-16 Englesson John Elov Ship propeller having rotatable blades
US2456361A (en) * 1943-08-14 1948-12-14 Sulzer Ag Device for adjusting the blades of ships' propellers
FR1083482A (fr) * 1953-04-17 1955-01-10 Helice Marine Ratier Forges & Dispositif de commande, notamment du pas d'une hélice
US2959156A (en) * 1956-08-03 1960-11-08 Sarl Ratier Aviat Marine Hydraulic servo-device for controlling linearly or rotatably movable members, with indication of the position thereof
FR1260746A (fr) * 1960-03-31 1961-05-12 Moteurs Baudouin Soc D Commande hydraulique d'hélice marine réversible
US3229771A (en) * 1963-04-29 1966-01-18 Karlstad Mekaniska Ab Runner-controlled hydraulic turbines, pumps and propellers

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2244770A (en) * 1937-01-15 1941-06-10 Englesson John Elov Operating device for propellers, turbine wheels, and pump wheels having rotatable blades
US2255920A (en) * 1937-02-01 1941-09-16 Englesson John Elov Ship propeller having rotatable blades
US2456361A (en) * 1943-08-14 1948-12-14 Sulzer Ag Device for adjusting the blades of ships' propellers
FR1083482A (fr) * 1953-04-17 1955-01-10 Helice Marine Ratier Forges & Dispositif de commande, notamment du pas d'une hélice
US2959156A (en) * 1956-08-03 1960-11-08 Sarl Ratier Aviat Marine Hydraulic servo-device for controlling linearly or rotatably movable members, with indication of the position thereof
FR1260746A (fr) * 1960-03-31 1961-05-12 Moteurs Baudouin Soc D Commande hydraulique d'hélice marine réversible
US3229771A (en) * 1963-04-29 1966-01-18 Karlstad Mekaniska Ab Runner-controlled hydraulic turbines, pumps and propellers

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4028004A (en) * 1974-07-03 1977-06-07 Lips B.V. Feathering controllable pitch propeller
US4049363A (en) * 1974-07-13 1977-09-20 Gea Luftkuhlergesellschaft Happel Gmbh & Co. Kg Axial flow fan with adjustable blades
US4020781A (en) * 1974-12-04 1977-05-03 Newage Engineers Limited Marine propulsion systems with variable-pitch screw propellers
US4822243A (en) * 1986-04-18 1989-04-18 Dowty Rotol Limited Bladed rotor assemblies and control means therefor
US4863347A (en) * 1987-10-03 1989-09-05 Dowty Rotol Limited Bladed rotor assemblies
US6261062B1 (en) * 2000-01-17 2001-07-17 Brunswick Corporation Actuation system for a controllable pitch propeller
US20090180883A1 (en) * 2008-01-11 2009-07-16 Mt-Propeller Entwicklung Gmbh Hydraulically controlled variable pitch propeller
US8469668B2 (en) * 2008-01-11 2013-06-25 Mt-Propeller Entwicklung Gmbh Hydraulically controlled variable pitch propeller
US20110142640A1 (en) * 2009-01-22 2011-06-16 Mitsubishi Heavy Industries, Ltd. Cylinder driving device

Also Published As

Publication number Publication date
SE321160B (xx) 1970-02-23
FR2050019A5 (xx) 1971-03-26
BE751534A (fr) 1970-11-16
DE2027824A1 (de) 1970-12-17
GB1310839A (en) 1973-03-21
NL7008257A (xx) 1970-12-08

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