WO2015159722A1 - シリンダ装置 - Google Patents
シリンダ装置 Download PDFInfo
- Publication number
- WO2015159722A1 WO2015159722A1 PCT/JP2015/060503 JP2015060503W WO2015159722A1 WO 2015159722 A1 WO2015159722 A1 WO 2015159722A1 JP 2015060503 W JP2015060503 W JP 2015060503W WO 2015159722 A1 WO2015159722 A1 WO 2015159722A1
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- WO
- WIPO (PCT)
- Prior art keywords
- rod
- piston
- cylinder
- side chamber
- orifice plug
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/48—Arrangements for providing different damping effects at different parts of the stroke
- F16F9/486—Arrangements for providing different damping effects at different parts of the stroke comprising a pin or stem co-operating with an aperture, e.g. a cylinder-mounted stem co-operating with a hollow piston rod
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/48—Arrangements for providing different damping effects at different parts of the stroke
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
- F16F9/063—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid comprising a hollow piston rod
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
- F16F9/3228—Constructional features of connections between pistons and piston rods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/34—Special valve constructions; Shape or construction of throttling passages
Definitions
- the present invention relates to a cylinder device used as a shock absorber or an actuator.
- JP 2005-227270A discloses a suspension cylinder including a piston and a cylinder to which the piston is slidably attached.
- the piston is composed of a bottomed cylindrical piston main body and a cylindrical ring member provided on the upper outer peripheral side of the piston main body.
- An annular cavity is provided between the piston body and the cylinder.
- the piston body is provided with a predetermined number of first orifices spaced apart in the circumferential direction. Each first orifice is formed so as to communicate the internal space of the piston body with the cavity.
- the piston body is provided with a predetermined number of second orifices spaced apart in the circumferential direction at positions different from the first orifice in the longitudinal direction.
- a check ball is provided outside each second orifice.
- the object of the present invention is to prevent the orifice plug from falling off by a simple method.
- a cylinder device comprising a cylinder and a piston rod that is inserted into the cylinder so as to freely advance and retract, wherein the piston rod extends to the outside of the cylinder;
- a piston that is coupled to an end of the rod portion and slidably moves in the cylinder, and divides the inside of the cylinder into a piston side chamber and a rod side chamber, and the rod portion is formed of the rod portion.
- a rod inner space that is formed inside and communicates with the piston side chamber of the cylinder, a first communication passage that connects the rod inner space and the rod side chamber of the cylinder, and is provided to be exchangeable with the first communication passage.
- the piston is connected to the rod portion so as to cover a part of the orifice plug.
- FIG. 1 is a cross-sectional view of a shock absorber according to a first embodiment of the present invention.
- FIG. 2 is a partially enlarged view of the piston rod in FIG.
- FIG. 3 is a sectional view of an actuator according to the second embodiment of the present invention.
- FIG. 4 is a partially enlarged view of FIG.
- FIG. 5 is a partial cross-sectional view of the actuator according to the second embodiment of the present invention, and shows a cross section different from FIG.
- the shock absorber 100 is a device that is interposed between a vehicle body and an axle of a vehicle, for example, and generates damping force to suppress vibration of the vehicle body.
- the shock absorber 100 includes a cylindrical cylinder 1 and a piston rod 2 inserted into the cylinder 1 so as to freely advance and retract.
- the shock absorber 100 is mounted on a vehicle in a direction in which the cylinder 1 is on the upper side and the piston rod 2 is on the lower side, as shown in FIG.
- the piston rod 2 includes a rod portion 11 that extends to the outside of the cylinder 1 and a piston 12 that is connected to the end of the rod portion 11 and moves slidably within the cylinder 1.
- the inside of the cylinder 1 is divided into a piston side chamber 13 and a rod side chamber 14 by a piston 12, and hydraulic oil as a working fluid is sealed in the piston side chamber 13 and the rod side chamber 14.
- the cylinder 1 is filled with a gas for obtaining a spring action by utilizing the volume change in the cylinder 1 as the piston rod 2 enters and leaves the cylinder 1.
- a cylinder head 3 through which the rod portion 11 of the piston rod 2 is slidably inserted is provided at the end of the cylinder 1.
- the cylinder head 3 has a cylindrical main body portion 3a and a flange portion 3b having a diameter larger than that of the main body portion 3a.
- the cylinder head 3 is fixed to the cylinder 1 by fastening the flange portion 3 b to the end portion of the cylinder 1 with a bolt 4.
- a seal member 7 and a dust seal 8 that are in sliding contact with the outer peripheral surface of the rod portion 11 are provided on the inner peripheral surface of the main body 3 a of the cylinder head 3.
- the bottom member 5 is joined to the end of the cylinder 1 opposite to the cylinder head 3.
- the bottom member 5 has an attachment portion 5a for attaching the shock absorber 100 to the vehicle.
- the rod portion 11 is a cylindrical member, and has a rod inner chamber 16 as a rod inner space communicating with the piston side chamber 13 of the cylinder 1 inside.
- the rod portion 11 is provided in the first communication passage 18 and the second communication passage 19 that connect the rod inner chamber 16 and the rod side chamber 14 of the cylinder 1 and the hydraulic fluid that is exchangeably provided in the first communication passage 18 and passes therethrough.
- a check valve 21 that is provided in the second communication passage 19 and permits only the flow of hydraulic oil from the rod inner chamber 16 to the rod side chamber 14. .
- a rod head 6 is provided at the end of the rod portion 11 on the side extending from the cylinder 1.
- the opening end on the piston 12 side in the rod portion 11 communicates with the piston side chamber 13, and the opening end on the opposite side to the piston 12 is sealed by the rod head 6.
- the rod inner chamber 16 has one end communicating with the piston side chamber 13 and the other end sealed by the rod head 6.
- the rod head 6 has a stopper portion 6a that is formed with a larger diameter than the piston rod 2 and defines a stroke end when the shock absorber 100 is contracted, and an attachment portion 6b for attaching the shock absorber 100 to the vehicle.
- the stopper portion 6 a is provided with an annular cushion ring 10 that prevents a collision between the cylinder head 3 and the rod head 6 at the stroke end when the shock absorber 100 is contracted.
- the shock absorber 100 When the shock absorber 100 is contracted, the pressure in the piston side chamber 13 and the rod inner chamber 16 rises and the check valve 21 is opened, so that the hydraulic oil in the piston side chamber 13 and the rod inner chamber 16 becomes the orifice plug 20. And flows into the rod side chamber 14 through the check valve 21.
- the shock absorber 100 when the shock absorber 100 is extended, the pressure in the rod side chamber 14 is increased and the check valve 21 is closed, so that the hydraulic oil in the rod side chamber 14 passes through only the orifice plug 20 and the piston side chamber 13 and the rod interior. It flows into the chamber 16.
- the damping force generated by the shock absorber 100 is greater during the extension operation than during the contraction operation.
- the shock absorber 100 contracts relatively smoothly, and then generates a large damping force when the vehicle is extended, so that the shock absorber 100 moves from the road surface to the vehicle body. Effectively attenuates input vibration.
- the first communication path 18 and the second communication path 19 have openings on the inner and outer peripheral surfaces of the rod portion 11 and are formed to penetrate in the radial direction.
- the first communication path 18 and the second communication path 19 are formed at substantially the same position in the axial direction of the rod portion 11, and are formed at different positions in the circumferential direction of the rod portion 11.
- the first communication passage 18 has a uniform inner diameter.
- a female screw 18 a is formed on the outer peripheral surface side of the rod portion 11, while no female screw is formed on the inner peripheral surface side of the rod portion 11.
- the orifice plug 20 has a male screw 20a formed on the outer peripheral surface and screwed into the female screw 18a of the first communication passage 18, and an orifice portion 20b for restricting the flow of hydraulic oil.
- the orifice plug 20 is screwed into the first communication passage 18 and fastened, and the damping force generated by the orifice plug 20 is determined by the diameter of the orifice portion 20b.
- the second communication path 19 has a large diameter portion 19a that opens to the outer peripheral surface of the rod portion 11, and a small diameter portion 19b that opens to the inner peripheral surface of the rod portion 11 and has a smaller diameter than the large diameter portion 19a.
- the check valve 21 includes an annular seat surface 21a formed between the large diameter portion 19a and the small diameter portion 19b, a ball 21b accommodated in the large diameter portion 19a and having a diameter larger than the inner diameter of the small diameter portion 19b, Have When the pressure on the large diameter portion 19a side is larger than the pressure on the small diameter portion 19b side, the ball 21b is seated on the seat surface 21a, and the flow of hydraulic oil from the large diameter portion 19a side to the small diameter portion 19b side is blocked.
- the piston 12 is a cylindrical member, and includes a fastening part 25 fastened to the rod part 11 and a ring part 26 provided along the outer peripheral surface of the rod part 11.
- the inner diameter of the fastening portion 25 is substantially the same as the inner diameter of the rod portion 11, and the inner diameter of the ring portion 26 is substantially the same as the outer diameter of the rod portion 11.
- the inner diameter of the fastening portion 25 is formed smaller than the inner diameter of the ring portion 26.
- an annular end surface 27 that is flat in the radial direction is formed at the boundary between the fastening portion 25 and the ring portion 26 on the inner periphery of the piston 12.
- the outer peripheral surface of the fastening part 25 and the outer peripheral surface of the ring part 26 are the same and formed continuously. That is, the outer diameter of the piston 12 is uniform in the axial direction. However, the outer diameter of the piston 12 does not need to be uniform in the axial direction.
- the fastening portion 25 is formed with a fastening hole 25 a that is formed along the axial direction and opens to the annular end surface 27.
- a plurality of fastening holes 25a are formed at predetermined intervals in the circumferential direction.
- the rod portion 11 is also formed with a fastening hole 11b formed along the axial direction and opening to the end surface 11a.
- a plurality of fastening holes 11b are formed in the circumferential direction at the same interval as the fastening holes 25a.
- the rod portion 11 When connecting the piston 12 to the rod portion 11, the rod portion 11 is inserted into the ring portion 26 of the piston 12 until the annular end surface 27 of the piston 12 and the end surface 11a of the rod portion 11 come into contact with each other.
- the fastening holes 11b are aligned.
- the bolt 29 is fastened from the fastening hole 25a to the fastening hole 11b. In this way, the piston 12 is fixed to the rod portion 11.
- the ring part 26 of the piston 12 closes a part of the opening on the outer peripheral surface of the rod part 11 in the first communication path 18. That is, the piston 12 is connected to the rod portion 11 so as to close a part of the opening portion of the outer peripheral surface of the rod portion 11 in the first communication path 18.
- the piston 12 is connected to the rod portion 11 so that the ring portion 26 covers a part of the orifice plug 20.
- the orifice plug 20 is prevented from dropping from the first communication passage 18 to the rod side chamber 14. Since an internal thread is not formed on the inner peripheral surface side of the rod portion 11 on the inner peripheral surface of the first communication path 18, the orifice plug 20 does not drop into the rod inner chamber 16. In this manner, the piston plug 12 connected to the rod portion 11 can prevent the orifice plug 20 from falling off.
- the ring portion 26 of the piston 12 closes a part of the opening on the outer peripheral surface of the rod portion 11 in the second communication path 19. That is, the piston 12 is connected to the rod portion 11 so that the ring portion 26 covers a part of the check valve 21.
- the axial length of the ring portion 26 of the piston 12 is set so that the tip of the ring portion 26 overlaps a part of the orifice plug 20 and does not reduce the flow path of the orifice portion 20b. It is necessary to set so that the ball 21 b of the valve 21 does not fall off from the large diameter portion 19 a of the second communication passage 19.
- the orifice plug 20 To replace the orifice plug 20, loosen and remove the bolt 29 to release the piston 12 and the rod part 11 and remove the piston 12 from the rod part 11. Thereby, the end surface of the orifice plug 20 is exposed to the opening of the outer peripheral surface of the rod portion 11 in the first communication path 18. In this state, the orifice plug 20 is removed from the first communication path 18 by attaching a tool to the orifice plug 20 from the outer peripheral surface side of the rod portion 11 and rotating the orifice plug 20. And the orifice plug 20 which has the orifice part 20b of a desired diameter is fastened to the 1st communicating path 18 using a tool.
- the replacement of the orifice plug 20 is performed by removing the piston 12 from the rod portion 11 and replacing the orifice plug 20 screwed into the first communication passage 18 and fastened with a tool.
- replacement with the orifice plug 20 having a different diameter of the orifice portion 20b can be easily performed, so that the damping force generated by the shock absorber 100 can be easily adjusted.
- the shock absorber 100 having a structure in which a first communication passage 18 connecting the rod inner chamber 16 and the rod side chamber 14 is provided in the rod portion 11 and a damping force is generated by squeezing the hydraulic oil flowing through the first communication passage 18.
- a desired damping force characteristic can be obtained.
- the piston 12 is connected to the end of the rod portion 11 so as to cover a part of the orifice plug 20, the orifice plug 20 is prevented from loosening and dropping off due to vibration. In this way, it is possible to prevent the orifice plug 20 from falling off by a simple method.
- the orifice plug 20 is prevented from falling off by the piston 12, no loosening prevention treatment such as screwing agent or caulking is required when the orifice plug 20 is attached to the rod portion 11. As a result of not requiring the locking treatment, the orifice plug 20 can be easily replaced.
- the damping action is exhibited only by the orifice portion 20b of the orifice plug 20. Therefore, since it is difficult to be influenced by the viscosity of the hydraulic oil, the change in the damping force characteristic with respect to the viscosity change can be reduced, and the damping force can be easily adjusted.
- a plurality of orifice plugs 20 may be provided.
- a plurality of first communication paths 18 are formed in the circumferential direction of the rod portion 11, and an orifice plug 20 is fastened to each first communication path 18.
- the piston 12 is connected to the rod portion 11 so as to cover a part of each orifice plug 20.
- the orifice plug 20 is configured to be screwed into the first communication passage 18 and fastened. Instead of this, the orifice plug 20 may be press-fitted into the first communication path 18.
- the first communication path 18 is configured to have a uniform inner diameter. Instead, in order to prevent the orifice plug 20 from dropping into the rod inner chamber 16, the inner diameter of the first communication passage 18 on the rod inner chamber 16 side may be slightly reduced.
- the shock absorber 100 is configured to obtain a spring action with the gas sealed in the cylinder 1.
- a suspension spring may be provided between the vehicle body and the wheel separately from the shock absorber 100.
- the piston 12 is fixed to the rod portion 11 by the bolt 29.
- the piston 12 may be fixed to the outer periphery of the rod portion 11 with a screw.
- the actuator 200 is used as, for example, a bucket cylinder mounted on a hydraulic excavator, and the bucket of the hydraulic excavator rotates when the actuator 200 expands and contracts.
- the actuator 200 includes a cylindrical cylinder 31 and a piston rod 32 that is inserted into the cylinder 31 so as to freely advance and retract.
- the piston rod 32 includes a rod portion 41 that extends to the outside of the cylinder 31 and a piston 42 that is connected to the end portion of the rod portion 41 and moves slidably within the cylinder 1.
- the inside of the cylinder 31 is partitioned into a piston side chamber 43 and a rod side chamber 44 by a piston 42, and hydraulic oil as a working fluid is sealed in the piston side chamber 43 and the rod side chamber 44.
- the piston side chamber 43 and the rod side chamber 44 are connected to a hydraulic pump or tank as a hydraulic pressure supply source through a switching valve. When one of the piston side chamber 43 and the rod side chamber 44 is connected to the hydraulic pump, the other is connected to the tank.
- the actuator 200 expands and contracts when hydraulic oil is guided from the hydraulic pump to the piston side chamber 43 or the rod side chamber 44 and the piston rod 32 moves in the axial direction.
- a cylinder head 33 through which the rod portion 41 of the piston rod 32 is slidably inserted is provided at the end of the cylinder 31.
- the cylinder head 33 has a cylindrical main body portion 33a and a flange portion 33b having a diameter larger than that of the main body portion 33a.
- the cylinder head 33 is fixed to the cylinder 31 by fastening the flange portion 33 b to the end portion of the cylinder 31 with a bolt 34.
- a seal member 37, a dust seal 38, and a bearing 39 that are in sliding contact with the outer peripheral surface of the rod portion 41 are provided on the inner peripheral surface of the main body portion 33 a of the cylinder head 33.
- the bottom member 35 is joined to the end of the cylinder 31 opposite to the cylinder head 33.
- the bottom member 35 has an attachment portion 35a for attaching the actuator 200 to the hydraulic excavator.
- the rod portion 41 has a small diameter portion 41a formed at the tip portion, and a large diameter portion 41b that is in sliding contact with the inner peripheral surface of the cylinder head 33 and has a larger diameter than the small diameter portion 41a.
- an annular shoulder end surface 41c flat in the radial direction is formed at the boundary between the small diameter portion 41a and the large diameter portion 41b.
- a male screw is formed in the small diameter portion 41a.
- the piston 42 is a cylindrical member, and includes a fastening portion 57 that is formed with an internal thread on the inner periphery and fastened to the rod portion 41, and a ring portion 58 that is provided along the outer peripheral surface of the rod portion 41.
- the inner diameter of the ring portion 58 is formed larger than the inner diameter of the fastening portion 57.
- an annular end surface 42 c that is flat in the radial direction is formed on the inner periphery of the piston 42 at the boundary between the fastening portion 57 and the ring portion 58.
- the fastening portion 57 of the piston 42 is screwed into the small diameter portion 41a of the rod portion 41 until the annular end surface 42c of the piston 42 and the shoulder end surface 41c of the rod portion 41 abut.
- the piston 42 is tightened with a predetermined tightening torque.
- a rod head 36 is provided at the end of the rod portion 41 on the side extending from the cylinder 1.
- the rod head 36 is formed with an attachment portion 36a for attaching the actuator 200 to the hydraulic excavator.
- a reduced oil passage 51 and an oil extension passage 52 are formed side by side in the axial direction.
- the oil extension passage 52 is formed to open at the end face of the rod portion 41 on the piston 42 side, and communicates with the piston side chamber 43.
- an opening portion that opens to an end surface of the rod portion 41 on the piston 42 side is sealed with a plug 53, and does not communicate with the piston-side chamber 43.
- a main communication passage 54 having one end opened on the outer peripheral surface of the rod portion 41 and the other end communicating with the oil reduction passage 51 is formed in the radial direction.
- the contracted oil passage 51 communicates with the rod side chamber 44 through the main communication passage 54.
- the contracted oil passage 51 corresponds to the rod internal space described in the claims.
- supply / discharge ports 55 and 56 that open to the outer peripheral surface of the rod portion 41 and communicate with the oil reduction passage 51 and the oil extension passage 52 are formed in the radial direction.
- Hydraulic piping is connected to the supply / discharge ports 55 and 56, and the hydraulic piping is connected to a hydraulic pump or a tank through a switching valve.
- the supply / discharge port is provided by attaching the actuator 200 so that the piston rod 32 is on the upper side and the cylinder 31 is on the lower side.
- the hydraulic piping connected to 55 and 56 is far from the ground, and damage to the hydraulic piping can be prevented.
- Actuator 200 exhibits a cushioning action that decelerates piston rod 32 in the vicinity of the stroke end during extension operation. Below, a cushion effect
- the rod portion 41 is provided in exchange for the first communication passage 48 and the second communication passage 49 that connect the oil reduction passage 51 and the rod side chamber 44 of the cylinder 31, and the first communication passage 48. And an orifice plug 60 that generates a damping force by applying resistance, and a check valve 61 that is provided in the second communication passage 49 and allows only the flow of hydraulic oil from the reduced oil passage 51 to the rod side chamber 44. .
- the hydraulic oil is discharged only through the orifice plug 60.
- the pressure in the rod side chamber 44 is increased and the piston rod 32 is decelerated. In this way, the cushioning action is exhibited. It should be noted that the hydraulic oil in the rod side chamber 44 is not discharged through the check valve 61 while the cushion action is exerted.
- a plurality of sub-communication passages having one end opened in the outer peripheral surface of the rod portion 41 and the other end opened in the oil reduction passage 51 are formed between the main communication passage 54 and the first communication passage 48 in the rod portion 41. It may be.
- the sub communication passages are shut off in order, and finally the hydraulic oil in the rod side chamber 44 is only the orifice plug 60. Will be discharged through. If comprised in this way, after the main communicating path 54 is interrupted
- the cushion pressure which is the pressure in the rod side chamber 44 during the cushion operation in which the cushion action is exerted, is adjusted by the orifice plug 60. That is, the effectiveness of the cushioning action can be freely adjusted by replacing the orifice plug 60.
- the first communication path 48 and the second communication path 49 are formed in the radial direction of the rod portion 41, and one end opens to the outer peripheral surface of the rod portion 41 and the other end opens to the oil reduction passage 51.
- the first communication path 48 and the second communication path 49 are formed at substantially the same position in the axial direction of the rod portion 41, and are formed at different positions in the circumferential direction of the rod portion 41.
- the first communication passage 48 has a uniform inner diameter. On the inner peripheral surface of the first communication passage 48, a female screw 48 a is formed on the outer peripheral surface side of the rod portion 41, while no female screw is formed on the reduced oil passage 51 side.
- the orifice plug 60 has a male screw 60a formed on the outer peripheral surface and screwed into the female screw 48a of the first communication passage 48, and an orifice portion 60b for restricting the flow of hydraulic oil.
- the orifice plug 60 is screwed into the first communication passage 48 and fastened, and the damping force generated by the orifice plug 60 is determined by the diameter of the orifice portion 60b.
- the second communication passage 49 has a large diameter portion 49a that opens to the outer peripheral surface of the rod portion 41, and a small diameter portion 49b that opens to the inner peripheral surface of the rod portion 41 and has a smaller diameter than the large diameter portion 49a.
- the check valve 61 includes an annular seat surface 61a formed between the large diameter portion 49a and the small diameter portion 49b, a ball 61b accommodated in the large diameter portion 49a and having a diameter larger than the inner diameter of the small diameter portion 49b, Have When the pressure on the large-diameter portion 49a side is larger than the pressure on the small-diameter portion 49b side, the ball 61b is seated on the seat surface 61a and the flow of hydraulic oil from the large-diameter portion 49a side to the small-diameter portion 49b side is blocked.
- the ring portion 58 of the piston 42 closes a part of the opening on the outer peripheral surface of the rod portion 41 in the first communication path 48. That is, the piston 42 is connected to the rod portion 41 so that the ring portion 58 covers a part of the orifice plug 60. Thereby, the orifice plug 60 is prevented from dropping from the first communication passage 48 to the rod side chamber 44. Since an internal thread is not formed on the inner peripheral surface of the first communication passage 48 on the side of the reduced oil passage 51, the orifice plug 60 does not drop into the reduced oil passage 51. As described above, the piston 42 connected to the rod portion 41 can prevent the orifice plug 60 from falling off.
- the ring portion 58 of the piston 42 closes a part of the opening on the outer peripheral surface of the rod portion 41 in the second communication path 49. That is, the piston 42 is connected to the rod portion 41 so that the ring portion 58 covers a part of the check valve 61. Thereby, the ball 61b of the check valve 61 is prevented from dropping from the second communication passage 49 to the rod side chamber 44. Since the diameter of the ball 61 b is larger than the inner diameter of the small diameter portion 49 b of the second communication passage 49, the ball 61 b does not drop into the oil reduction passage 51. In this way, the check valve 61 can be prevented from falling off by the piston 42 connected to the rod portion 41.
- the axial length of the ring portion 58 of the piston 42 is set so that the tip of the ring portion 58 overlaps with a part of the orifice plug 60 and does not reduce the flow path of the orifice portion 60b. It is necessary to set so that the ball 61 b of the valve 61 does not fall off from the large diameter portion 49 a of the second communication passage 49.
- the screwing of the piston 42 and the rod portion 41 is released, and the piston 42 is removed from the rod portion 41.
- the end surface of the orifice plug 60 is exposed at the opening of the outer peripheral surface of the rod portion 41 in the first communication passage 48.
- the orifice plug 60 is removed from the first communication passage 48 by attaching a tool to the orifice plug 60 from the outer peripheral surface side of the rod portion 41 and rotating the orifice plug 60.
- the orifice plug 60 which has the orifice part 60b of a desired diameter is fastened to the 1st communicating path 48 using a tool.
- the replacement of the orifice plug 60 is performed by removing the piston 42 from the rod portion 41 and replacing the orifice plug 60, which is screwed into the first communication passage 48 and fastened, with a tool.
- replacement with the orifice plug 60 having a different diameter of the orifice portion 60b can be easily performed, so that the effectiveness of the cushion action can be easily adjusted.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
Abstract
Description
本第1実施形態では、シリンダ装置が車両に搭載されるショックアブソーバ100である場合について、図1及び2を参照して説明する。
本第2実施形態では、シリンダ装置が流体圧供給源から供給される作動流体によって伸縮作動して負荷を駆動するアクチュエータ200である場合について、図3~5を参照して説明する。
Claims (4)
- シリンダと、当該シリンダに進退自在に挿入されたピストンロッドと、を備えるシリンダ装置であって、
前記ピストンロッドは、
前記シリンダの外部へと延出するロッド部と、
前記ロッド部の端部に連結されて前記シリンダ内を摺動自在に移動し、前記シリンダ内をピストン側室とロッド側室に区画するピストンと、を有し、
前記ロッド部は、
前記ロッド部の内部に形成されて前記シリンダの前記ピストン側室と連通するロッド内空間と、
前記ロッド内空間と前記シリンダの前記ロッド側室とを接続する第1連通路と、
前記第1連通路に交換可能に設けられるオリフィスプラグと、を有し、
前記ピストンは、前記オリフィスプラグの一部を覆うように前記ロッド部に連結されるシリンダ装置。 - 請求項1に記載のシリンダ装置であって、
前記ロッド内空間と前記シリンダの前記ロッド側室とを接続する第2連通路と、
前記第2連通路に設けられ前記ロッド内空間から前記ロッド側室への作動流体の流れのみを許容する逆止弁と、をさらに備え、
前記ピストンは、前記逆止弁の一部を覆うように前記ロッド部に連結されるシリンダ装置。 - 請求項1に記載のシリンダ装置であって、
前記シリンダ装置は、車体の振動を抑制するショックアブソーバであって、
前記オリフィスプラグは、通過する作動流体に対して抵抗を付与して減衰力を発生するシリンダ装置。 - 請求項1に記載のシリンダ装置であって、
前記シリンダ装置は、流体圧供給源から前記シリンダに供給される作動流体によって伸縮作動して負荷を駆動するアクチュエータであって、
前記オリフィスプラグは、通過する作動流体に対して抵抗を付与して前記アクチュエータの伸長作動時のストローク端付近で前記ピストンロッドを減速させるクッション作用を発揮するシリンダ装置。
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KR1020167024131A KR20160145541A (ko) | 2014-04-17 | 2015-04-02 | 실린더 장치 |
EP15780345.3A EP3109501B1 (en) | 2014-04-17 | 2015-04-02 | Cylinder device |
CA2941517A CA2941517C (en) | 2014-04-17 | 2015-04-02 | Cylinder device |
US15/124,141 US9995362B2 (en) | 2014-04-17 | 2015-04-02 | Cylinder device |
CN201580013486.5A CN106133380B (zh) | 2014-04-17 | 2015-04-02 | 作动缸装置 |
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US10470876B2 (en) * | 2015-11-10 | 2019-11-12 | Edwards Lifesciences Corporation | Transcatheter heart valve for replacing natural mitral valve |
JP2019108905A (ja) * | 2017-12-15 | 2019-07-04 | 本田技研工業株式会社 | ダンパー装置 |
DE102018106157A1 (de) * | 2018-03-16 | 2019-09-19 | Voith Patent Gmbh | Vorrichtung zum Abdämpfen von Druckkräften |
JP7202170B2 (ja) * | 2018-12-18 | 2023-01-11 | Kyb株式会社 | 流体圧緩衝器 |
US20220009302A1 (en) * | 2020-07-10 | 2022-01-13 | Caterpillar Inc. | Clevis-ended suspension strut manufactured without welds |
JP2022147805A (ja) | 2021-03-23 | 2022-10-06 | Kyb株式会社 | 流体圧緩衝器 |
JP2022147806A (ja) | 2021-03-23 | 2022-10-06 | Kyb株式会社 | 流体圧緩衝器 |
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JP2005227270A (ja) * | 2004-01-15 | 2005-08-25 | Komatsu Ltd | ダンプトラックの積載重量測定方法及び積載重量測定装置 |
JP2008157393A (ja) * | 2006-12-26 | 2008-07-10 | Kayaba Ind Co Ltd | 緩衝器のバルブ構造 |
JP2009243634A (ja) * | 2008-03-31 | 2009-10-22 | Hitachi Ltd | 液圧緩衝器 |
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CA2941517A1 (en) | 2015-10-22 |
CN106133380A (zh) | 2016-11-16 |
CN106133380B (zh) | 2019-05-14 |
CA2941517C (en) | 2021-11-02 |
EP3109501B1 (en) | 2018-10-10 |
EP3109501A4 (en) | 2017-12-06 |
US20170016505A1 (en) | 2017-01-19 |
JP6343480B2 (ja) | 2018-06-13 |
JP2015206374A (ja) | 2015-11-19 |
US9995362B2 (en) | 2018-06-12 |
KR20160145541A (ko) | 2016-12-20 |
EP3109501A1 (en) | 2016-12-28 |
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