WO2022044833A1 - Cylindre hydraulique de type à plusieurs étages - Google Patents

Cylindre hydraulique de type à plusieurs étages Download PDF

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Publication number
WO2022044833A1
WO2022044833A1 PCT/JP2021/029752 JP2021029752W WO2022044833A1 WO 2022044833 A1 WO2022044833 A1 WO 2022044833A1 JP 2021029752 W JP2021029752 W JP 2021029752W WO 2022044833 A1 WO2022044833 A1 WO 2022044833A1
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WO
WIPO (PCT)
Prior art keywords
rod
side chamber
supply
rod side
rod assembly
Prior art date
Application number
PCT/JP2021/029752
Other languages
English (en)
Japanese (ja)
Inventor
泰志 船戸
夏樹 谷川
Original Assignee
Ｋｙｂ株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ｋｙｂ株式会社 filed Critical Ｋｙｂ株式会社
Priority to CN202180052327.1A priority Critical patent/CN115943261A/zh
Priority to GB2303134.7A priority patent/GB2613494B/en
Publication of WO2022044833A1 publication Critical patent/WO2022044833A1/fr

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Classifications

    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/16—Characterised by the construction of the motor unit of the straight-cylinder type of the telescopic type
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/204—Control means for piston speed or actuating force without external control, e.g. control valve inside the piston
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1423—Component parts; Constructional details
    • F15B15/1447—Pistons; Piston to piston rod assemblies
    • 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
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/04—Special measures taken in connection with the properties of the fluid
    • F15B21/047—Preventing foaming, churning or cavitation
    • 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
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7057—Linear output members being of the telescopic type
    • 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
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/8609—Control during or prevention of abnormal conditions the abnormal condition being cavitation
    • 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
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/86—Control during or prevention of abnormal conditions
    • F15B2211/8616—Control during or prevention of abnormal conditions the abnormal condition being noise or vibration

Definitions

  • the present invention relates to a multi-stage fluid pressure cylinder.
  • a cylinder tube In JP2017-172681A, a cylinder tube, a tubular outer rod member having an outer piston portion sliding along the inner peripheral surface of the cylinder tube provided at the end, and a rod arranged inside the outer rod member.
  • a multi-stage fluid pressure cylinder comprising an inner rod member having a flow path for supplying and discharging the working fluid to the side chamber and a flow path for supplying and discharging the working fluid to the anti-rod side chamber is disclosed.
  • the device in which the multi-stage fluid pressure cylinder is installed may vibrate.
  • An object of the present invention is to suppress the momentary operation of a multi-stage fluid pressure cylinder generated in response to an external force.
  • the multi-stage fluid pressure cylinder is a cylinder tube and an outer piston that slides along the inner peripheral surface of the cylinder tube and divides the inside of the cylinder tube into a rod side chamber and an anti-rod side chamber.
  • a tubular outer rod member whose portion is provided at the end, an inner rod member provided inside the outer rod member so as to be movable in the axial direction of the cylinder tube, and a working fluid for the anti-rod side chamber.
  • a first supply / discharge passage for supplying / discharging and a second supply / discharge passage for supplying / discharging the working fluid to the rod side chamber are provided, and the second supply / discharge passage is provided on the inner rod member and is provided on the inner side.
  • the rod member is provided with a backflow prevention mechanism that allows only the flow of the working fluid from the second supply / discharge passage to the anti-rod side chamber.
  • the multi-stage fluid pressure cylinder 100 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 5.
  • the multi-stage hydraulic cylinder 100 is a multi-stage hydraulic cylinder 100 (hereinafter, simply referred to as “hydraulic cylinder 100”) in which hydraulic oil is used as a working fluid will be described.
  • the hydraulic cylinder 100 includes a bottomed cylinder-shaped cylinder tube 10, a first rod assembly 30 as an outer rod member slidably inserted inside the cylinder tube 10, and a first rod.
  • a third rod assembly 50 as an inner rod member movably provided inside the assembly 30 in the central axial direction of the cylinder tube 10 (hereinafter, simply referred to as "axial direction"), a first rod assembly 30, and a third rod assembly 30.
  • a second rod assembly 40 as an intermediate rod member provided so as to be movable in the axial direction between the rod assembly 50 and the rod assembly 50 is provided.
  • FIG. 1 is a cross-sectional view showing a state in which the hydraulic cylinder 100 is most contracted.
  • the hydraulic cylinder 100 is connected to the cylinder tube via a first mounting portion 61 provided at the bottom of the cylinder tube 10 and a second mounting portion 62 provided at the end of the third rod assembly 50 protruding from the cylinder tube 10. 10 is located on the upper side in the vertical direction, and the third rod assembly 50 is located on the lower side in the vertical direction, and is attached to the device to be driven. That is, the hydraulic cylinder 100 is attached to the drive target device so that the first attachment portion 61 is displaced in the substantially vertical direction, that is, in the vertical direction with respect to the second attachment portion 62.
  • the direction in which the hydraulic cylinder 100 is attached is not limited to this, and the cylinder tube 10 may be attached so as to be located on the lower side in the vertical direction and the third rod assembly 50 on the upper side in the vertical direction. Further, the hydraulic cylinder 100 may be mounted on the drive target device so that the first mounting portion 61 is displaced along the horizontal direction with respect to the second mounting portion 62.
  • the first rod assembly 30 slides along the inner peripheral surface 10a of the cylinder tube 10 provided at one end of the cylindrical outer rod portion 31 and the outer rod portion 31, and the inside of the cylinder tube 10 is opposite to the rod side chamber 2.
  • a cylindrical first support that is formed so as to project radially inward from the other end of the outer rod portion 31 and the annular outer piston portion 32 that is partitioned into the rod side chamber 5 and slidably supports the second rod assembly 40. It has a portion 33 and.
  • the first snap ring 35 is a metal wire rod formed in a substantially annular shape, and has a joint portion (not shown) which is partially divided.
  • the first snap ring 35 is inserted into the first rod assembly 30 in a reduced diameter state, and its outer diameter side is pressed against the inner peripheral surface 30a by the elastic force acting in the diameter expansion direction and fitted into the annular recess 30b. Is done.
  • the inner diameter side of the first snap ring 35 is in a state of protruding inward in the radial direction from the inner peripheral surface 30a of the first rod assembly 30. Become.
  • the first snap ring 35 is attached after the second rod assembly 40 is inserted into the first rod assembly 30.
  • the second rod assembly 40 has the same shape as the first rod assembly 30, and has a cylindrical first inner rod portion 41 inserted into the outer rod portion 31 and a second rod assembly 40 facing the anti-rod side chamber 5. 1
  • An annular first inner piston portion 42 provided at one end of the inner rod portion 41 and sliding along the inner peripheral surface 30a of the first rod assembly 30, and diameters from the other end of the first inner rod portion 41. It has a cylindrical second support portion 43 that is formed so as to project inward in the direction and slidably supports the third rod assembly 50.
  • a second annular recess 40b to which the second snap ring 45 is mounted is formed on the inner peripheral surface 40a on the first inner piston portion 42 side of the second rod assembly 40.
  • the second snap ring 45 is a metal wire rod formed in a substantially annular shape, and has a joint portion (not shown) which is partially divided.
  • the second snap ring 45 is inserted into the second rod assembly 40 in a reduced diameter state, and its outer diameter side is pressed against the inner peripheral surface 40a by the elastic force acting in the diameter expansion direction, and the second annular recess 40b is used. It is fitted in.
  • the third rod assembly 50 is provided at the end of the second inner rod portion 51 as an inner rod portion inserted into the first inner rod portion 41 and the second inner rod portion 51 so as to face the anti-rod side chamber 5.
  • the second rod assembly 40 has an annular second inner piston portion 52 as an inner piston portion that slides along the inner peripheral surface 40a.
  • the second inner piston portion 52 is coupled to one end of the second inner rod portion 51 via a plurality of bolts 53.
  • a cylinder head 11 that slidably supports the outer rod portion 31 of the first rod assembly 30 is provided at the opening of the cylinder tube 10, and the cylinder tube 10 opposes the piston portions 32, 42, 52 in the axial direction.
  • a recess 10b recessed toward the first mounting portion 61 is formed in the bottom portion of the above. The inner diameter of the recess 10b is set to be larger than the inner diameter of the outer piston portion 32 of the first rod assembly 30.
  • the maximum contraction position of the first rod assembly 30 inserted into the cylinder tube 10 is defined by the outer piston portion 32 abutting on the bottom of the cylinder tube 10, and the maximum extension position is the maximum extension position of the outer piston portion 32 on the cylinder head 11. Specified by abutment.
  • the inner peripheral surface of the cylinder head 11 is shown to seal a gap between the inner peripheral surface of the cylinder head 11 and the outer peripheral surface of the outer rod portion 31 in order to prevent leakage of hydraulic oil to the outside. No sealing member is provided.
  • the maximum contraction position of the second rod assembly 40 inserted into the first rod assembly 30 is defined by the contact of the first inner piston portion 42 with the first snap ring 35 mounted on the first rod assembly 30.
  • the extension position is defined by the first inner piston portion 42 coming into contact with the first support portion 33.
  • the first snap ring 35 limits the movement of the second rod assembly 40 in the contraction direction, and when the hydraulic cylinder 100 contracts, the first rod assembly 30 falls off from the cylinder tube 10. Is being prevented.
  • a sealing member (not shown) for sealing the gap is provided.
  • the maximum contraction position of the third rod assembly 50 inserted into the second rod assembly 40 is defined by the contact of the second inner piston portion 52 with the second snap ring 45 mounted on the second rod assembly 40, and is the most defined.
  • the extension position is defined by the second inner piston portion 52 coming into contact with the second support portion 43.
  • the second snap ring 45 limits the movement of the third rod assembly 50 in the contraction direction, and when the hydraulic cylinder 100 contracts, the second rod assembly 40 falls off from the cylinder tube 10. Is being prevented.
  • annular recess 43a facing the opening of the communication hole 51b described later formed in the second inner rod portion 51 when the third rod assembly 50 is most extended is formed. Will be done.
  • the annular recess 43a is formed so as to open into the second inner rod side chamber 4, which will be described later.
  • the cylinder tube 10 into which the first rod assembly 30, the second rod assembly 40 and the third rod assembly 50 having the above shapes are inserted the cylinder tube 10, the cylinder head 11, the outer rod portion 31 and the outer piston portion 32 are inserted.
  • the anti-rod side chamber 5 partitioned by the inner piston portion 52 is formed.
  • a first seal member 34 is provided on the outer peripheral surface 32a of the outer piston portion 32 of the first rod assembly 30, and is passed through a gap between the outer peripheral surface 32a of the outer piston portion 32 and the inner peripheral surface 10a of the cylinder tube 10. The communication between the rod side chamber 2 and the anti-rod side chamber 5 is blocked by the first seal member 34.
  • a plurality of supply / discharge ports 32b for supplying / discharging hydraulic oil to / from the rod side chamber 2 are formed so as to penetrate in the radial direction.
  • a second seal member 44 is provided on the outer peripheral surface 42a of the first inner piston portion 42 of the second rod assembly 40, and the outer peripheral surface 42a of the first inner piston portion 42 and the inner peripheral surface 30a of the first rod assembly 30 are provided. The communication between the first inner rod side chamber 3 and the anti-rod side chamber 5 through the gap between them is blocked by the second seal member 44.
  • a plurality of inner supply / discharge ports 42b for supplying / discharging hydraulic oil to / from the first inner rod side chamber 3 are formed so as to penetrate in the radial direction. ..
  • a third seal member 54 is provided on the outer peripheral surface 52a of the second inner piston portion 52 of the third rod assembly 50, and the outer peripheral surface 52a of the second inner piston portion 52 and the inner peripheral surface 40a of the second rod assembly 40 are provided. The communication between the second inner rod side chamber 4 and the anti-rod side chamber 5 through the gap between them is blocked by the third seal member 54.
  • the second inner rod portion 51 of the third rod assembly 50 includes a second supply / discharge passage 51a connected to an external device (not shown) for supplying / discharging hydraulic oil to the hydraulic cylinder 100, and a second supply / discharge passage 51a.
  • a communication hole 51b that communicates with the second inner rod side chamber 4 is formed.
  • the second inner rod portion 51 is formed with a connecting passage 51c for connecting the passage 64 formed in the second mounting portion 62 and the second supply / discharge passage 51a.
  • the second supply / discharge passage 51a communicates with the second inner rod side chamber 4 through the communication hole 51b, and also communicates with the first inner rod side chamber 3 through the inner supply / discharge port 42b and the communication hole 51b. It communicates with the rod side chamber 2 through the exhaust port 42b and the communication hole 51b.
  • the hydraulic oil is supplied to the rod side chamber 2, the first inner rod side chamber 3 and the second inner rod side chamber 4, and the hydraulic oil is discharged from the rod side chamber 2, the first inner rod side chamber 3 and the second inner rod side chamber 4. Is performed through the second supply / discharge passage 51a formed in the second inner rod portion 51.
  • the second inner rod portion 51 is provided with a pipe-shaped supply / discharge pipe 55 in which a first supply / discharge passage 55a connected to an external device for supplying / discharging hydraulic oil to the hydraulic cylinder 100 is formed inside. Be done.
  • the supply / discharge pipe 55 is incorporated in the second inner rod portion 51 so that one end faces the anti-rod side chamber 5 and opens. Specifically, the supply / discharge pipe 55 penetrates the second supply / discharge passage 51a in the axial direction. It is joined to the second inner rod portion 51.
  • the second inner rod portion 51 is formed with a connection passage 51d for connecting the passage 63 formed in the second attachment portion 62 and the other end side of the supply / discharge pipe 55.
  • the supply / discharge pipe 55 is provided so as to open in the anti-rod side chamber 5, so as to open in the anti-rod side chamber 5, the supply of the hydraulic oil to the anti-rod side chamber 5 and the discharge of the hydraulic oil from the anti-rod side chamber 5 can be performed. It will be performed through the first supply / discharge passage 55a in the supply / discharge pipe 55.
  • hydraulic oil is supplied to the anti-rod side chamber 5 from a hydraulic source such as a pump (not shown) through the first supply / discharge passage 55a in the supply / discharge pipe 55, and the rod side chamber 2 and the first inside.
  • the hydraulic oil in the rod side chamber 3 and the second inner rod side chamber 4 is discharged to a tank (not shown) through the second supply / discharge passage 51a.
  • the hydraulic cylinder 100 When the hydraulic cylinder 100 extends from the maximum contracted state shown in FIG. 1, hydraulic oil is supplied to the anti-rod side chamber 5 through the first supply / discharge passage 55a.
  • the pressure receiving area that receives the pressure of the anti-rod side chamber 5 is the largest when the first rod assembly 30 is extended, and is the smallest when the third rod assembly 50 is extended. Therefore, when the hydraulic cylinder 100 is extended from the most contracted state, the cylinder tube 10 first moves relative to the first rod assembly 30. Specifically, as shown in FIG. 2, the cylinder tube 10 moves upward (upper side in FIG. 2) with respect to the first rod assembly 30.
  • the recess 10b formed in the bottom of the cylinder tube 10 has an inner diameter larger than the inner diameter of the outer piston portion 32 of the first rod assembly 30, the pressure of the hydraulic oil guided to the anti-rod side chamber 5 is the recess. It acts on the outer piston portion 32 through 10b.
  • the cylinder tube 10 is in a state in which the cylinder tube 10 is most extended with respect to the first rod assembly 30, that is, the cylinder tube 10 is in contact with the outer piston portion 32 of the first rod assembly 30.
  • the cylinder tube 10 and the first rod assembly 30 move relative to the second rod assembly 40 due to the pressure of the anti-rod side chamber 5.
  • the cylinder tube 10 and the first rod assembly 30 move upward (upper side in FIG. 3) with respect to the second rod assembly 40.
  • the state in which the first rod assembly 30 is most extended with respect to the second rod assembly 40, that is, the first support portion 33 of the first rod assembly 30 is the first of the second rod assembly 40.
  • the pressure of the anti-rod side chamber 5 causes the cylinder tube 10 to the third rod assembly 50.
  • the first rod assembly 30 and the second rod assembly 40 will move relative to each other. Specifically, as shown in FIG. 4, the cylinder tube 10, the first rod assembly 30, and the second rod assembly 40 move upward (upper side in FIG. 4) with respect to the third rod assembly 50.
  • the state in which the second rod assembly 40 is most extended with respect to the third rod assembly 50, that is, the second support portion 43 of the second rod assembly 40 is the second of the third rod assembly 50.
  • the first rod assembly 30, and the second rod assembly 40 move upward until they come into contact with the inner piston portion 52, the hydraulic cylinder 100 is in the fully extended state.
  • the hydraulic cylinder 100 contracts, hydraulic oil is supplied from the hydraulic source to the rod side chamber 2, the first inner rod side chamber 3 and the second inner rod side chamber 4 through the second supply / discharge passage 51a, and the anti-rod side chamber is used.
  • the hydraulic oil of No. 5 is discharged to the tank through the first supply / discharge passage 55a.
  • the contraction operation of the hydraulic cylinder 100 may be due to the own weight of the drive target device connected to the first mounting portion 61. In this case, it is not necessary to supply hydraulic oil to the rod side chamber 2, the first inner rod side chamber 3 and the second inner rod side chamber 4, and the rod side chamber 2, the first inner rod side chamber 3 and the second inner rod side chamber 4 do not need to be supplied with hydraulic oil. Hydraulic oil will be sucked from the tank.
  • the hydraulic cylinder 100 momentarily moves. After slightly contracting, expansion and contraction due to the reaction are repeated to some extent, and then the expansion operation is resumed. If the hydraulic cylinder 100 repeatedly expands and contracts in such a relatively short time, the device on which the hydraulic cylinder 100 is installed, for example, the vehicle on which the hydraulic cylinder 100 is mounted may vibrate.
  • FIG. 5 is an enlarged view of a portion surrounded by a broken line indicated by an arrow A in FIG. 1 showing the hydraulic cylinder 100 in the most contracted state.
  • the backflow prevention mechanism 71 shown in FIG. 5 is formed so as to penetrate the inside of the second inner piston portion 52 in the axial direction, and one end thereof opens to the second supply / discharge passage 51a and the other end opens to the anti-rod side chamber 5.
  • a check valve 72 provided in the hole.
  • the check valve 72 has a valve body 72a and a spring 72b for urging the valve body 72a, and blocks the flow of hydraulic oil from the anti-rod side chamber 5 to the second supply / discharge passage 51a to block the second supply.
  • the pressure of the exhaust passage 51a becomes larger than the pressure of the anti-rod side chamber 5, the operation is performed so as to allow the flow of hydraulic oil from the second supply / exhaust passage 51a to the anti-rod side chamber 5.
  • the second supply / discharge passage 51a provided in the third rod assembly 50 communicates with the second inner rod side chamber 4 through the communication hole 51b when the first rod assembly 30 extends, and the inner supply / discharge port It communicates with the first inner rod side chamber 3 through the 42b and the communication hole 51b, and communicates with the rod side chamber 2 through the supply / discharge port 32b, the inner supply / discharge port 42b and the communication hole 51b.
  • the second rod assembly 40 extends, it communicates with the second inner rod side chamber 4 through the communication hole 51b, and communicates with the first inner rod side chamber 3 through the inner supply / discharge port 42b and the communication hole 51b.
  • the third rod assembly 50 extends, it communicates with the second inner rod side chamber 4 through the communication hole 51b.
  • the first rod assembly 30 when the first rod assembly 30 is provided with a check valve that allows the flow of hydraulic oil from the rod side chamber 2 to the anti-rod side chamber 5, the supply is supplied while the first rod assembly 30 is extended.
  • the pressure of the first inner rod side chamber 3 and the second inner rod side chamber 4 communicating through the exhaust port 32b becomes larger than the pressure of the anti-rod side chamber 5, hydraulic oil flows into the anti-rod side chamber 5 through the check valve.
  • the second rod assembly 40 is extended, the first inner rod side chamber 3 and the second inner rod side chamber 4 and the rod side chamber 2 are not in communication with each other. Even if the pressure of the inner rod side chamber 4 becomes larger than the pressure of the anti-rod side chamber 5, hydraulic oil cannot flow into the anti-rod side chamber 5 through the check valve provided in the first rod assembly 30.
  • the second rod assembly 40 is provided with a check valve that allows the flow of hydraulic oil from the first inner rod side chamber 3 to the anti-rod side chamber 5
  • the third rod assembly 50 when the third rod assembly 50 is extended, for example, Since the first inner rod side chamber 3 and the second inner rod side chamber 4 are not in communication with each other, the second rod assembly is made even if the pressure of the second inner rod side chamber 4 becomes larger than the pressure of the anti-rod side chamber 5. The hydraulic oil cannot flow into the anti-rod side chamber 5 through the check valve provided in 40.
  • the hydraulic cylinder 100 is described above.
  • an external force that forcibly extends the hydraulic cylinder 100 beyond the extension speed acts suddenly, and the pressure of any of the rod side chambers 2, 3 and 4 is applied to the check valve side chamber 5.
  • the hydraulic oil will quickly flow into the counter-rod side chamber 5 from the second supply / discharge passage 51a through the check valve 72.
  • the check valve 72 is arranged inside the third rod assembly 50 provided with the first supply / discharge passage 55a and the second supply / discharge passage 51a, that is, the rod member provided in the cylinder tube 10. It is provided on the rod member.
  • the cross-sectional shape of the pressure receiving surface of the third rod assembly 50 arranged on the innermost side is not an annular shape but a circular shape. Therefore, as compared with the case where the check valve 72 is provided on the first rod assembly 30 and the second rod assembly 40 whose cross-sectional shape of the pressure receiving surface is annular, the check valve does not need to increase the outer diameter of the rod member. Space for arranging the 72 can be easily secured.
  • the through holes provided with the check valve 72 are the first through holes 51e formed in the second inner rod portion 51 and the insertion holes formed in the second inner piston portion 52.
  • the second through hole 52b formed in the second inner piston portion 52 is formed as an insertion hole through which a bolt 53 as a fastening member used for assembling the second inner piston portion 52 to the second inner rod portion 51 is inserted. It is one of a plurality of second through holes 52b.
  • the manufacturing cost of the hydraulic cylinder 100 is compared with the case where the through hole is separately formed.
  • the check valve 72 can be arranged compactly.
  • the check valve 72 may be built in a bolt 53 that fastens the second inner piston portion 52 and the second inner rod portion 51.
  • the second inner piston portion 52 and the second inner piston portion 52 and the second check valve 72 may be built in the bolt 53. A sufficient fastening force for fastening the inner rod portion 51 can be secured.
  • the pressure of the check valve side chamber 5 is higher. Since the pressure is always higher than the pressures of the rod side chambers 2, 3 and 4, even if the check valve 71 is merely a check valve 72, it does not affect the operation of the hydraulic cylinder 100. However, when the hydraulic cylinder 100 is contracted by supplying pressurized hydraulic oil to the rod side chambers 2, 3 and 4, the pressure of the anti-rod side chamber 5 is higher than the pressure of the rod side chambers 2, 3 and 4. If the check valve 72 is used as the check valve 72, the hydraulic cylinder 100 may not be able to contract.
  • the backflow prevention mechanism 71 is used in the rod side chambers 2 and 3 so that the hydraulic oil does not flow from the second supply / discharge passage 51a to the anti-rod side chamber 5 through the backflow prevention mechanism 71 during the contraction operation.
  • 4 may be a relief valve that opens only when the pressure of 4 is higher than the pressure of the anti-rod side chamber 5 by a predetermined value or more.
  • the valve opening pressure of the valve body 72a can be changed by appropriately changing the load of the spring 72b that urges the valve body 72a.
  • the check valve 72 as a backflow prevention mechanism 71 that allows only the flow of hydraulic oil from the second supply / discharge passage 51a to the anti-rod side chamber 5 is provided in the first supply / discharge passage 55a and the second. It is provided on the third rod assembly 50 having the supply / discharge passage 51a, that is, the rod member arranged on the innermost side among the rod members provided in the cylinder tube 10.
  • the backflow prevention mechanism 71 that allows only the flow of hydraulic oil from the second supply / discharge passage 51a to the anti-rod side chamber 5 is provided with the third rod assembly having the first supply / discharge passage 55a and the second supply / discharge passage 51a.
  • the sealing member that seals the rod side chambers 2, 3 and 4 may come off or the cylinder tube 10 may expand. Can be prevented.
  • the cross-sectional shape of the pressure receiving surface of the third rod assembly 50 arranged on the innermost side among the rod members provided in the cylinder tube 10 is not an annular shape but a circular shape. Therefore, as compared with the case where the check valve 72 is provided on the first rod assembly 30 and the second rod assembly 40 whose cross-sectional shape of the pressure receiving surface is annular, the check valve does not need to increase the outer diameter of the rod member. Space for arranging the 72 can be easily secured.
  • the check valve 72 of the hydraulic cylinder 100 according to the first embodiment is a check valve 72 provided in a through hole formed so as to penetrate the inside of the second inner piston portion 52 in the axial direction.
  • the backflow prevention mechanism 171 of the hydraulic cylinder 200 is a check seal 172 provided between the outer circumference of the supply / discharge pipe 55 as a tubular member and the inner circumference of the through hole 51f. It's different.
  • FIG. 6 is a diagram showing the hydraulic cylinder 200 according to the second embodiment, and is a diagram showing a portion corresponding to FIG. 5. Since the basic configuration and operation of the hydraulic cylinder 200 are the same as those of the hydraulic cylinder 100 according to the first embodiment, the description thereof will be omitted.
  • the through hole 51f is formed so as to penetrate the inside of the second inner piston portion 52 in the axial direction, one end of which opens in the second supply / discharge passage 51a and the other end of which opens in the anti-rod side chamber 5. It is a hole and is provided at the end of the second inner rod portion 51 to which the second inner piston portion 52 is coupled.
  • One end of the supply / discharge pipe 55 is inserted into the through hole 51f through a predetermined gap, and the outer periphery of the supply / discharge pipe 55 inserted into the through hole 51f is along the outer peripheral surface 55b of the supply / discharge pipe 55.
  • a check seal 172 that slides on the surface is provided.
  • the through hole 51f is provided with a storage groove 51g formed to be recessed toward the outside in the radial direction in order to store the check seal 172.
  • the check seal 172 is an annular member formed of a resin material such as rubber or an elastic material such as metal, and as shown in FIGS. 7A and 7B, the inner peripheral surface 172a in contact with the outer peripheral surface 55b of the supply / discharge pipe 55.
  • Has a divided joint portion 172f. 7A is a plan view of the check seal 172
  • FIG. 7B is a cross-sectional view showing a cross section taken along the line BB of FIG. 7A.
  • the check seal 172 having the above shape is attached to the outer peripheral surface 55b of the supply / discharge pipe 55 so as to widen the gap of the abutment portion 172f, and the inner peripheral surface 172a of the supply / discharge pipe 55 is due to the elastic force acting in the diameter reduction direction. It is slightly pressed against the outer peripheral surface 55b, and the outer peripheral surface 55b of the supply / discharge pipe 55 becomes slidable along the axial direction. In this state, the size of the outer diameter of the check seal 172 is set so that a gap having a predetermined size is formed between the outer peripheral surface 172b and the bottom surface of the accommodating groove 51g.
  • the abutment portion 172f is not limited to this, and the shape of the abutment portion 172f is not limited to this, with respect to the circumferential direction of the check seal 172. It may have a shape cut at a right angle or diagonally.
  • the check seal 172 is housed in the storage groove 51g so that the distribution surface 172d is located on the anti-rod side chamber 5 side and the seal surface 172e is located on the second supply / discharge path 51a side.
  • the check seal 172 By providing the check seal 172 in this way, when the pressure of the second supply / discharge passage 51a, that is, the pressure of the rod side chambers 2, 3 and 4 becomes higher than the pressure of the anti-rod side chamber 5, the check seal 172 is distributed. The surface 172d is pressed against the side surface of the accommodation groove 51g. Then, in this state, the working fluid is supplied through the gap formed between the outer peripheral surface 172b of the check seal 172 and the bottom surface of the accommodating groove 51g and the notch groove 172c formed in the flow surface 172d. It is possible to flow from the exhaust passage 51a to the anti-rod side chamber 5.
  • the check seal 172 has the seal surface 172e which is a flat surface and the accommodation groove 51g. It will be in a state of being pressed against the side surface of. In this state, a gap through which the hydraulic oil can flow is not formed, and the flow of the hydraulic oil from the anti-rod side chamber 5 to the second supply / discharge passage 51a is blocked.
  • the check seal 172 that allows only the flow of hydraulic oil from the second supply / discharge passage 51a to the anti-rod side chamber 5 is provided with the through hole 51f capable of communicating the second supply / discharge passage 51a and the anti-rod side chamber 5.
  • the hydraulic cylinder 200 since the check seal 172 is provided between the through hole 51f formed in the second inner rod portion 51 and the supply / discharge pipe 55 inserted into the through hole 51f, the supply / discharge pipe is provided. It is not necessary to weld the 55 to the second inner rod portion 51. Therefore, it is not necessary to take measures to prevent the welded portion from cracking due to the expansion or contraction of the supply / discharge pipe 55 due to the temperature change and the hydraulic oil leaking from the anti-rod side chamber 5 to the second supply / discharge passage 51a. Become.
  • the check seal 172 as a backflow prevention mechanism 171 that allows only the flow of hydraulic oil from the second supply / discharge passage 51a to the anti-rod side chamber 5 is provided in the first supply / discharge passage 55a and the second supply. It is provided on the third rod assembly 50 having the exhaust passage 51a, that is, the rod member arranged on the innermost side among the rod members provided in the cylinder tube 10.
  • the backflow prevention mechanism 171 that allows only the flow of hydraulic oil from the second supply / discharge passage 51a to the anti-rod side chamber 5 is provided with the third rod assembly having the first supply / discharge passage 55a and the second supply / discharge passage 51a.
  • the sealing member that seals the rod side chambers 2, 3 and 4 may come off or the cylinder tube 10 may expand. Can be prevented.
  • the multi-stage fluid pressure cylinder 300 (hereinafter, referred to as “hydraulic cylinder 300”) according to the third embodiment of the present invention will be described.
  • the points different from those of the first embodiment will be mainly described, and the same reference numerals are given to the same configurations as those of the first embodiment, and the description thereof will be omitted.
  • the check valve 72 of the hydraulic cylinder 100 according to the first embodiment is a check valve 72 provided in a through hole formed so as to penetrate the inside of the second inner piston portion 52 in the axial direction.
  • the check valve mechanism 271 of the hydraulic cylinder 300 has an outer peripheral surface 52a of the second inner piston portion 52 of the third rod assembly 50 and an inner peripheral surface 40a of the second rod assembly 40. The difference is that it is a check seal 172 provided between them.
  • FIG. 8 is a diagram showing the hydraulic cylinder 300 according to the third embodiment, and is a diagram showing a portion corresponding to FIG. 5. Since the basic configuration and operation of the hydraulic cylinder 300 are the same as those of the hydraulic cylinder 100 according to the first embodiment, the description thereof will be omitted. Further, since the check seal 172 used in the hydraulic cylinder 300 is only different in radial size from the check seal 172 used in the hydraulic cylinder 200 according to the second embodiment, detailed description thereof will be omitted.
  • the check seal 172 used in the hydraulic cylinder 300 is slidably provided along the inner peripheral surface 40a of the second rod assembly 40, and the check seal 172 is provided on the outer peripheral surface 52a of the second inner piston portion 52.
  • an accommodating groove 52c formed indented inward in the radial direction is provided.
  • the check seal 172 is attached to the inner peripheral surface 40a of the second rod assembly 40 so as to narrow the gap of the abutment portion 172f, and the outer peripheral surface 172b is inside the second rod assembly 40 due to the elastic force acting in the diameter expansion direction. It is slightly pressed against the peripheral surface 40a, and the inner peripheral surface 40a of the second rod assembly 40 becomes slidable along the axial direction. In this state, the size of the inner diameter of the check seal 172 is set so that a gap having a predetermined size is formed between the inner peripheral surface 172a and the bottom surface of the accommodating groove 52c.
  • the check seal 172 is provided in the accommodating groove 52c so that the distribution surface 172d is located on the anti-rod side chamber 5 side and the seal surface 172e is located on the second inner rod side chamber 4 side.
  • the check seal 172 By providing the check seal 172 in this way, the pressure of the second supply / discharge passage 51a and the rod side chambers 2 and 3 communicating with the second inner rod side chamber 4 and the second inner rod side chamber 4 is higher than the pressure of the anti-rod side chamber 5.
  • the check seal 172 When the height is increased, the check seal 172 is in a state where the distribution surface 172d is pressed against the side surface of the accommodating groove 52c. Then, in this state, the working fluid is second through the gap formed between the inner peripheral surface 172a of the check seal 172 and the bottom surface of the accommodating groove 52c and the notch groove 172c formed in the flow surface 172d. It is possible to flow from the inner rod side chamber 4 to the anti-rod side chamber 5.
  • the check seal 172 becomes flat.
  • the sealing surface 172e which is a surface, is pressed against the side surface of the accommodating groove 52c. In this state, a gap through which the hydraulic oil can flow is not formed, and the flow of the hydraulic oil from the anti-rod side chamber 5 to the second inner rod side chamber 4 is blocked.
  • the check seal 172 that allows only the flow of hydraulic oil from the second supply / discharge passage 51a to the anti-rod side chamber 5 through the second inner rod side chamber 4 is provided, and the second supply / discharge passage 51a and the anti-rod side chamber 5 are provided.
  • the rod side chambers 2, 3 and 4 can be arranged.
  • the hydraulic cylinder 300 it is possible to suppress the momentary expansion / contraction operation of the hydraulic cylinder 300 generated in response to an external force, as in the first embodiment. Further, in the hydraulic cylinder 300, a check is made between the outer peripheral surface 52a of the second inner piston portion 52 of the third rod assembly 50, which has been a sliding surface, and the inner peripheral surface 40a of the second rod assembly 40. Since the seal 172 is provided, it does not require much design change or additional processing, so that it is possible to suppress an increase in the manufacturing cost of the hydraulic cylinder 300 provided with the backflow prevention mechanism 271.
  • the check seal 172 may be provided in place of the third seal member 54, or may be provided together with the third seal member 54.
  • the check seal 172 as the backflow prevention mechanism 271 that allows only the flow of hydraulic oil from the second supply / discharge passage 51a to the anti-rod side chamber 5 is provided in the first supply / discharge passage 55a and the second supply. It is provided on the third rod assembly 50 having the exhaust passage 51a, that is, the rod member arranged on the innermost side among the rod members provided in the cylinder tube 10.
  • the backflow prevention mechanism 271 that allows only the flow of hydraulic oil from the second supply / discharge passage 51a to the anti-rod side chamber 5 is provided with the third rod assembly having the first supply / discharge passage 55a and the second supply / discharge passage 51a.
  • the sealing member that seals the rod side chambers 2, 3 and 4 may come off or the cylinder tube 10 may expand. Can be prevented.
  • the first supply / discharge passage 55a for supplying / discharging hydraulic oil to the anti-rod side chamber 5 is provided in the third rod assembly 50.
  • the first supply / discharge passage 55a may be provided in the cylinder tube 10, and in this case, with respect to the anti-rod side chamber 5 formed in the cylinder tube 10, for example, in the cylinder tube 10.
  • the hydraulic oil is directly supplied and discharged through the first supply / discharge passage 55a opened in the peripheral surface 10a.
  • three rod members (first rod assembly 30, second rod assembly 40, and third rod assembly 50) are radially overlapped in the cylinder tube 10.
  • the three-stage hydraulic cylinders 100, 200, and 300 are provided as an intermediate rod member between the first rod assembly 30 as the outer rod member and the third rod assembly 50 as the inner rod member.
  • One second rod assembly 40 is provided.
  • two or more second rod assemblies 40 as intermediate rod members may be provided between the first rod assembly 30 and the third rod assembly 50.
  • the hydraulic cylinders 100, 200, and 300 are not provided with the second rod assembly 40 as the intermediate rod member, and the third rod assembly as the inner rod member is inside the first rod assembly 30 as the outer rod member. It may be a two-stage hydraulic cylinder provided with only 50.
  • the hydraulic cylinders 100, 200, and 300 have a cylinder tube 10 and an outer piston portion 32 that slides along the inner peripheral surface 10a of the cylinder tube 10 and divides the inside of the cylinder tube 10 into a rod side chamber 2 and an anti-rod side chamber 5.
  • the third rod assembly 50 provided inside the first rod assembly 30 so as to be movable in the axial direction of the cylinder tube 10, and the anti-rod side chamber 5.
  • a first supply / discharge passage 55a for supplying / discharging hydraulic oil and a second supply / discharge passage 51a for supplying / discharging hydraulic oil to the rod side chamber 2 are provided, and the second supply / discharge passage 51a is a third rod assembly 50.
  • the third rod assembly 50 is provided with a backflow prevention mechanism 71, 171, 271 that allows only the flow of hydraulic oil from the second supply / discharge passage 51a to the anti-rod side chamber 5.
  • the backflow prevention mechanisms 71, 171 and 271 which allow only the flow of hydraulic oil from the second supply / discharge passage 51a to the anti-rod side chamber 5, are provided with the third rod assembly 50 provided with the second supply / discharge passage 51a. That is, it is provided in the third rod assembly 50 arranged on the innermost side among the rod members provided in the cylinder tube 10.
  • the hydraulic cylinders 100, 200, 300 contract momentarily even when the external force acting on the hydraulic cylinders 100, 200, 300 is released. It is possible to return to the extension operation relatively smoothly again without doing so, and as a result, it is possible to suppress the momentary expansion / contraction operation of the hydraulic cylinders 100, 200, 300 generated in response to the external force. Further, since the pressure in the rod side chambers 2, 3 and 4 is suppressed from suddenly increasing, the sealing member that seals the rod side chambers 2, 3 and 4 may come off or the cylinder tube 10 may expand. Can be prevented.
  • the cross-sectional shape of the pressure receiving surface of the third rod assembly 50 arranged on the innermost side among the rod members provided in the cylinder tube 10 is not an annular shape but a circular shape. Therefore, as compared with the case where the backflow prevention mechanisms 71, 171, 271 are provided on the first rod assembly 30 and the second rod assembly 40 whose cross-sectional shape of the pressure receiving surface is annular, the outer diameter of the rod member does not need to be increased. , The space for arranging the backflow prevention mechanisms 71, 171, 271 can be easily secured.
  • the third rod assembly 50 is provided at the end of the second inner rod portion 51 in which the second supply / discharge passage 51a is formed and the second inner rod portion 51, and is arranged facing the anti-rod side chamber 5.
  • a through hole 51e formed by penetrating the second inner piston portion 52 and the second inner piston portion 52 in the axial direction, one end opening in the second supply / discharge passage 51a and the other end opening in the anti-rod side chamber 5.
  • the check valve 72 having 52b and the check valve is provided in the through holes 51e and 52b.
  • the check valve mechanism 71 is a check valve 72 provided in the through holes 51e and 52b formed in the third rod assembly 50.
  • the check valve 72 By adding the simple structure of the check valve 72 to the third rod assembly 50 in this way, it is possible to suppress the momentary expansion / contraction operation of the hydraulic cylinder 100 generated in response to an external force.
  • the cross-sectional shape of the pressure receiving surface facing the anti-rod side chamber 5 is not an annular shape but a circular shape.
  • the through holes 51e and 52b provided with the check valve 72 and the check valve 72 that function as the check valve 71 can be easily laid out.
  • the second inner piston portion 52 is formed with a plurality of second through holes 52b through which the bolt 53 used for assembling the second inner piston portion 52 to the second inner rod portion 51 can be inserted.
  • One of the plurality of second through holes 52b constitutes a part of the through holes 51e and 52b.
  • one of the plurality of second through holes 52b through which the bolt 53 can be inserted constitutes a part of the through holes 51e and 52b in which the check valve 72 is provided.
  • the first supply / discharge passage 55a is provided in the third rod assembly 50, and the third rod assembly 50 has a second inner rod portion 51 having a second supply / discharge passage 51a formed therein and a second inner rod.
  • the second inner piston portion 52 provided at the end of the portion 51 and arranged facing the anti-rod side chamber 5 and the second inner piston portion 52 are formed so as to penetrate in the axial direction, and one end thereof is the second supply / discharge passage 51a. It has a through hole 51f whose other end is open to the anti-rod side chamber 5 and a supply / discharge pipe 55 which is inserted through the through hole 51f and has a first supply / discharge passage 55a formed inside.
  • Reference numeral 171 is a check seal 172 provided between the outer periphery of the supply / discharge pipe 55 and the inner circumference of the through hole 51f.
  • the backflow prevention mechanism 171 is a check seal 172 provided between the outer circumference of the supply / discharge pipe 55 and the inner circumference of the through hole 51f.
  • the check seal 172 is provided between the through hole 51f formed in the second inner rod portion 51 and the supply / discharge pipe 55 inserted into the through hole 51f, the check seal 172 is provided with a second supply / discharge pipe 55. It is not necessary to weld and join the inner rod portion 51.
  • the third rod assembly 50 is provided at the end of the second inner rod portion 51 in which the second supply / discharge passage 51a is formed and the second inner rod portion 51, and is arranged facing the anti-rod side chamber 5.
  • the second inner piston portion 52 has a second inner piston portion 52, and the second inner piston portion 52 has an inner peripheral surface 40a of the second rod assembly 40 provided between the first rod assembly 30 and the third rod assembly 50.
  • the backflow prevention mechanism 271 slides along the inner peripheral surface 30a of the first rod assembly 30, and the backflow prevention mechanism 271 has a second rod assembly 40 or a first rod assembly 30 with which the second inner piston portion 52 is in sliding contact, and a second inner side. It is a check seal 172 provided between the piston portion 52 and the piston portion 52.
  • the backflow prevention mechanism 271 is provided with a check seal 172 provided between the second rod assembly 40 or the first rod assembly 30 to which the second inner piston portion 52 is in sliding contact and the second inner piston portion 52. be.
  • a check seal 172 By adding the simple structure of the check seal 172 to the third rod assembly 50 in this way, it is possible to suppress the momentary expansion / contraction operation of the hydraulic cylinder 300 generated in response to an external force.
  • the check seal 172 may be provided in place of the third seal member 54 conventionally provided on the outer peripheral surface 52a of the second inner piston portion 52, or may be provided together with the third seal member 54. Since it does not require much change or additional processing, it is possible to suppress an increase in the manufacturing cost of the hydraulic cylinder 300 provided with the backflow prevention mechanism 271.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)

Abstract

Le cylindre hydraulique de type à plusieurs étages (100) de l'invention est équipé : d'un tube de cylindre (10) ; d'un premier assemblage de tige (30) dans lequel est agencée une partie piston côté externe (32) ; d'un troisième assemblage de tige (50) agencé côté interne du premier assemblage de tige (30) ; d'un premier trajet d'alimentation/décharge (55a) assurant l'alimentation en huile hydraulique et la décharge de celle-ci pour une chambre côté tige opposée (5) ; et d'un second trajet d'alimentation/décharge (51a) assurant l'alimentation en huile hydraulique et la décharge de celle-ci pour une chambre côté tige (2). Le second trajet d'alimentation/décharge (51a) est agencé au niveau du troisième assemblage de tige (50). Un mécanisme de prévention d'inversion de débit (71) qui autorise uniquement l'écoulement de l'huile hydraulique du second trajet d'alimentation/décharge (51a) vers la chambre côté tige opposée (5), est agencé au niveau du troisième assemblage de tige (50).
PCT/JP2021/029752 2020-08-24 2021-08-12 Cylindre hydraulique de type à plusieurs étages WO2022044833A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202180052327.1A CN115943261A (zh) 2020-08-24 2021-08-12 多级式流体压力缸
GB2303134.7A GB2613494B (en) 2020-08-24 2021-08-12 Multistage fluid pressure cylinder

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JP2020-141116 2020-08-24
JP2020141116A JP7177805B2 (ja) 2020-08-24 2020-08-24 多段式流体圧シリンダ

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115059661A (zh) * 2022-07-02 2022-09-16 安徽工程大学 一种带有行程锁止功能的多级伸出式液压缸结构

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023137714A (ja) * 2022-03-18 2023-09-29 Ｋｙｂ株式会社 流体圧シリンダ

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09277814A (ja) * 1996-04-15 1997-10-28 Kayaba Ind Co Ltd 車高調整装置
JP2012086666A (ja) * 2010-10-19 2012-05-10 Showa Corp 船舶推進機用トリム・チルト装置
JP2016148361A (ja) * 2015-02-10 2016-08-18 Ｋｙｂ株式会社 流体圧シリンダ
JP2017172681A (ja) * 2016-03-23 2017-09-28 Ｋｙｂ株式会社 多段式流体圧シリンダ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09277814A (ja) * 1996-04-15 1997-10-28 Kayaba Ind Co Ltd 車高調整装置
JP2012086666A (ja) * 2010-10-19 2012-05-10 Showa Corp 船舶推進機用トリム・チルト装置
JP2016148361A (ja) * 2015-02-10 2016-08-18 Ｋｙｂ株式会社 流体圧シリンダ
JP2017172681A (ja) * 2016-03-23 2017-09-28 Ｋｙｂ株式会社 多段式流体圧シリンダ

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115059661A (zh) * 2022-07-02 2022-09-16 安徽工程大学 一种带有行程锁止功能的多级伸出式液压缸结构
CN115059661B (zh) * 2022-07-02 2024-05-28 安徽工程大学 一种带有行程锁止功能的多级伸出式液压缸结构

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GB202303134D0 (en) 2023-04-19
JP2022036748A (ja) 2022-03-08
CN115943261A (zh) 2023-04-07
GB2613494A (en) 2023-06-07
GB2613494B (en) 2024-03-13

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