WO2013190961A1 - 両ロッド型ショックアブソーバ - Google Patents
両ロッド型ショックアブソーバ Download PDFInfo
- Publication number
- WO2013190961A1 WO2013190961A1 PCT/JP2013/064887 JP2013064887W WO2013190961A1 WO 2013190961 A1 WO2013190961 A1 WO 2013190961A1 JP 2013064887 W JP2013064887 W JP 2013064887W WO 2013190961 A1 WO2013190961 A1 WO 2013190961A1
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- Prior art keywords
- piston
- liquid
- chamber
- rod
- pistons
- 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
- F16F9/10—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using liquid only; using a fluid of which the nature is immaterial
- F16F9/14—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect
- F16F9/16—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts
- F16F9/18—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein
- F16F9/20—Devices with one or more members, e.g. pistons, vanes, moving to and fro in chambers and using throttling effect involving only straight-line movement of the effective parts with a closed cylinder and a piston separating two or more working spaces therein with the piston-rod extending through both ends of the cylinder, e.g. constant-volume dampers
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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
- F16F9/30—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium with solid or semi-solid material, e.g. pasty masses, as damping medium
- F16F9/303—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium with solid or semi-solid material, e.g. pasty masses, as damping medium the damper being of the telescopic type
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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
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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
- F16F9/483—Arrangements for providing different damping effects at different parts of the stroke characterised by giving a particular shape to the cylinder, e.g. conical
Definitions
- the present invention relates to a double rod type hydraulic shock absorber that is intended for a moving body that reciprocates and that stops any of the reciprocating motion in a buffering manner.
- a hydraulic shock absorber that has been generally known in the art is that a liquid chamber of a cylinder housing is filled with oil such as mineral oil and a brake piston. And a rod connected to the piston projecting from one end of the cylinder housing to the outside. When the moving body collides with the tip of the rod and the piston is displaced, the kinetic energy of the moving body is absorbed by the flow resistance of the oil flowing through the flow gap.
- a known shock absorber having such a configuration is such that a rod connected to a piston protrudes from one end of a cylinder housing to the outside, and a moving body that collides with its tip is buffered and stopped.
- a pair of shock absorbers When buffering and stopping both of the movements, it is necessary to dispose a pair of shock absorbers in opposite directions in the moving direction of the moving body.
- the moving body that stops the reciprocating motion is, for example, driven reciprocally by a fluid pressure driving device, a space for arranging a pair of shock absorbers is provided in the fluid pressure driving device or in the vicinity thereof. Since it is necessary to ensure, there is a possibility that the configuration of the fluid pressure drive device becomes complicated, or the installation thereof is restricted.
- Patent Document 3 discloses a shock absorber (shock absorber) having a pair of mutually independent piston rods whose one ends protrude in the axial direction of the cylinder from both ends of the cylinder.
- the shock absorber disclosed in Patent Document 3 is substantially formed by connecting two shock absorbers having a single piston rod in opposite directions, and is pushed out by the piston in both shock absorbers.
- the two shock absorbers can independently Since the flow resistance can be adjusted, a separate flow path for flowing fluid to the back side of the piston that becomes negative pressure due to the movement of the piston in the cylinder is formed separately, so that the braking force by both piston rods can be varied independently. It is a thing. For this reason, the flow path of fluid such as oil that provides flow resistance to the pair of pistons in the shock absorber is extremely complicated, is not easy to manufacture, and is difficult to stably exhibit a buffer function over a long period of time. There is sex.
- the two shock absorbers are connected as described above, and the braking force by both piston rods is made variable independently, it is relatively difficult to provide a structure part shared by the two shock absorbers,
- the flow resistance of the fluid pushed out by both pistons can be adjusted independently as described above, the flow path of the fluid such as oil providing the flow resistance is extremely complicated and has a large flow. It is necessary to provide a path, and as a result, the size of the configuration is increased as a whole, and at least it is difficult to reduce the size.
- the technical problem of the present invention is to provide a double rod type hydraulic shock absorber having a rational and simple design structure capable of bufferingly stopping a reciprocating moving body in both reciprocating directions. There is to do.
- Another technical problem of the present invention is to have a series of rods that project outward from both ends of the cylinder housing and collide with the moving body, and the rod collides with one end of the rod, the rod moves, and the buffer stops.
- the other end of the rod is surely pushed back to the proper return position of the other end of the cylinder housing, and the liquid pressurized by the brake piston flows in the direction opposite to the movement of the rod.
- a cylinder housing having a liquid chamber filled with a liquid, and one end and the other end of the cylinder housing that pass through the cylinder housing in the axial direction.
- a series of rods that protrude liquid-tightly from the end and reciprocate in the axial direction; and first and second pistons that are held in the axial direction at portions located in the liquid chamber of the rods;
- the first and second pistons are formed between the first piston and the second piston, and the first and second piston chambers partitioned by the one end side and the other end side of the liquid chamber.
- First and second unidirectional flow paths, and the first and second unidirectional flow paths are unidirectional flows located forward of the rod in the reciprocating movement of the rod.
- the passage is closed to prevent the flow of liquid from the piston chamber on the front side in the movement direction to the liquid storage chamber, and the one-way flow path located on the rear side in the movement direction of the rod is opened to remove the liquid from the liquid storage chamber.
- a double rod type shock absorber configured to allow the flow of liquid toward the piston chamber on the rear side in the moving direction is provided.
- the rod includes a first rod member projecting from one end of the cylinder housing, a second rod member projecting from the other end, and the first rod member and the second rod member.
- An intermediate member that is connected indoors, and the first and second pistons are axially displaced by a piston mounting portion formed at a position adjacent to the intermediate member of the first and second rod members. Disposed by the reciprocating movement of the rod, the intermediate member is alternately brought into contact with and separated from the first and second contact surfaces at one end and the other end, and the first and second directions are arranged.
- the flow path is formed between the inner peripheral surface of the first and second pistons and the outer peripheral surface of the piston mounting portion so as to always communicate with the first and second piston chambers;
- the first and second contact surfaces of the intermediate member and the top Between the side surfaces of the first and second pistons, there is an open / close path formed so as to cut off the communication path and the liquid storage chamber, and the first and second contact surfaces are in contact with each other. It is preferable that the opening / closing path is opened / closed by contacting / separating the first and second pistons.
- the side surface of the first and second pistons facing the first and second piston chambers and the stepped portion of the piston mounting portion at which the piston contacts and separates is formed.
- the inner diameter of the liquid chamber is largest at a position between the first piston chamber and the second piston chamber, and goes toward the first piston chamber side and the second piston chamber side. It is desirable that the diameter is gradually reduced. In this case, the inner diameter of the liquid chamber may be different between the first piston chamber side and the second piston chamber side.
- the portion of the first and second rod members that reciprocates in the liquid chamber, the intermediate member, the first and second pistons, and the first and second directions is desirable that the flow path is symmetric with respect to the center in the axial direction of the intermediate member.
- an accumulator is configured by accommodating an elastic member formed of a stretchable foam having closed cells in the liquid storage chamber, and applying pressure to the liquid to compress the elastic member. You can also. Further, the cylinder housing is formed with a filling hole for filling the liquid at a position which is a central portion of the liquid chamber, and the filling hole is closed with a pressure adjusting plug for applying a preload to the liquid. May be.
- the double rod type shock absorber having the above-described configuration is such that a pair of pistons are held by a series of rods penetrating the liquid chamber, and a moving body collides alternately with one end and the other end of the rod and the rod reciprocates.
- the liquid in the piston chamber pressurized by one piston flows into the liquid storage chamber through the circulation gap around the piston that performs the pressurization, and passes through the one-way flow path in the other piston from the liquid storage chamber.
- the other end of the rod is configured to flow into a piston chamber defined by the other piston, and when the rod moves in one direction due to the collision of the moving body and stops buffering at the moving end, the other end of the rod is the cylinder housing.
- the liquid pressed by the brake piston flows into the liquid chamber in the direction opposite to the rod moving direction. It is intended to prepare for the next collision of the moving body to the other end of the rod.
- the double-rod type having a rational and simple design structure capable of buffering and stopping the reciprocating moving body in either of the reciprocating directions.
- a hydraulic shock absorber can be obtained.
- FIGS. 1-4 show a first embodiment having a basic structure of a double rod type shock absorber according to the present invention.
- This double rod type shock absorber is intended to stop a reciprocating motion as a main braking target, and to stop any of the reciprocating motion in a buffered manner. It is used by being attached to a reciprocating actuator or a device that is reciprocally driven by the actuator, but is not limited thereto.
- This double rod type shock absorber includes a cylinder housing 1 in which one cylindrical (circular hole-shaped) liquid chamber 3 in which a liquid such as oil is filled is formed, and the liquid chamber 3 extends in the direction of the axis L.
- One end is closed by the first seal mechanism 20A and the first cover 4a, and the other end of the liquid chamber 3 in the axis L direction is closed by the second seal mechanism 20B and the second cover 4b.
- the end of the columnar first rod member 6a protrudes liquid-tightly outside through the center hole of the first seal mechanism 20A and the first cover 4a.
- the tip of the second rod member 6b protrudes liquid-tightly outside through the center hole with the second seal mechanism 20B and the second cover 4b, and the rod member
- the moving bodies that reciprocate at the tips of 6a and 6b collide alternately to stop the moving bodies in a buffering manner.
- a spiral groove 2 for mounting the shock absorber at a required position of the actuator for reciprocating the moving body is formed.
- the cylinder housing 1 is formed by any means. Etc. can be fixed at a required position. For example, in the third embodiment shown in FIG. 6, there is no spiral groove, and the cylinder housing 1 is fixed at a required installation position by any other means.
- the first and second rod members 6a and 6b are mechanically connected to each other in the configuration described below to form a series of connecting rods 5. Therefore, the connecting rod 5 passes through the liquid chamber 3 in the cylinder housing 1 in the direction of the axis L, and one end and the other end of the connecting rod 5 are the first and second sealing mechanisms 20A at both ends of the liquid chamber 3.
- the first and second covers 4a, 4b, respectively, are liquid-tightly projected to the outside, either one of the one end or the other end, that is, the tip of the first rod member 6a and the second
- the tip of the other rod member is removed from the cover of the liquid chamber 3.
- the length of the one connecting rod 5 is set so as to project to a required projecting position (return position) and wait for the next moving object to collide.
- the connecting rod is simply called a rod.
- the rod 5 has the proximal ends of the first and second rod members 6a, 6b protruding from the covers 4a, 4b at both ends of the liquid chamber 3 in the liquid chamber 3 in the axis L direction.
- the first and second pistons 10a and 10b having movable annular shapes are connected to each other by a cylindrical intermediate member 12 so as to sandwich the movable first and second pistons 10a and 10b. More specifically, as can be seen from FIG. 4, on the connecting end side of the rod members 6a and 6b with respect to the intermediate member 12, the piston mounting portions 7a and 7b having reduced diameters and the screws of the intermediate member 12 are provided.
- a connecting portion 8 having a male screw for screwing into the hole 12c is sequentially provided, and the pistons 10a and 10b are slidably fitted on the piston mounting portions 7a and 7b, and then the connecting portion 8 is placed in the middle.
- the member 12 is screwed into and connected to the screw hole 12c.
- the length of the piston mounting portions 7a and 7b in the direction of the axis L is slightly larger than the thickness of the pistons 10a and 10b, and the pistons 10a and 10b are within the range of the dimensional difference. It is possible to displace in the direction of the axis L.
- a first piston chamber 14a is formed between the first piston 10a and the first seal mechanism 20A at one end of the liquid chamber 3, and the second piston 10b and the liquid chamber 3 other than the first piston chamber 14a.
- a second piston chamber 14b is formed between the end and the second seal mechanism 20B.
- the first and second pistons 10a and 10b are disposed between the outer circumferences of the first and second pistons 10a and 10b and the inner circumferential surfaces of the first and second piston chambers 14a and 14b.
- the moving body moves in the direction of arrow A with respect to the first rod member 6a in a state where the first rod member 6a protrudes from the cylinder housing 1 as shown in FIG. 3 and 4, when the first rod member 6 a is pushed into the liquid chamber 3, the second piston chamber 14 b is moved by the second piston 10 b on the front side in the moving direction of the rod 5. Since the liquid inside is pressurized, the liquid inside the second piston chamber 14b flows into the liquid storage chamber 17 while being given flow resistance through the flow gap 13b around the second piston 10b. To do.
- the flow resistance in the flow gaps 13a and 13b at that time is reduced, that is, the flow gaps 13a and 13b are compared.
- the kinetic energy of the moving body needs to be largely absorbed, it is necessary to narrow the flow gaps 13a and 13b.
- the flow gaps 13a and 13b change in size according to the positions of the pistons 10a and 10b by adjusting the shapes of the inner peripheral surfaces of the piston chambers 14a and 14b.
- the flow gaps 13a and 13b are large at the part where the pistons 10a and 10b are located at the initial stage of the collision of the moving body, and then processed into a tapered surface or a curved surface approximated thereto, or reciprocating.
- the piston chamber peripheral surface is formed in a simple cylindrical shape so that the flow gaps 13a and 13b are constant.
- the flow gaps 13a and 13b are set appropriately.
- the adjustment of the shape of the inner peripheral surfaces of the piston chambers 14a and 14b for the piston chambers 14a and 14b is different depending on the kinetic energy of the moving body that moves forward and the moving body that moves backward in each of the piston chambers 14a and 14b. be able to.
- the distribution gaps 13a and 13b can be arbitrarily set regardless of the above-described example.
- the inner diameter of the liquid chamber 3 is set between the first piston chamber 14a and the second piston chamber 14b.
- the position is the largest, and the diameter is gradually decreased as it goes to the first piston chamber 14a side and the second piston chamber 14b side.
- the inner diameter of the liquid chamber 3 is changed in a curved line, but may be changed linearly.
- the rate of change in the inner diameter of the liquid chamber 3 can be made different between the piston chambers 14a and 14b.
- the inner diameter of the liquid chamber 3 may be constant over the entire length.
- first piston 10a moves to the first piston chamber 14a side between the first piston 10a and the holding portion of the rod 5 for the first piston 10a
- first piston 10a moves to the first piston chamber 14a side.
- the flow of liquid from the piston chamber 14a toward the liquid storage chamber 17 is prevented, and when the first piston 10a moves in the opposite direction, the flow of liquid from the liquid storage chamber 17 toward the first piston chamber 14a
- a first one-way flow path 18a is provided to allow
- the second piston 10b moves to the second piston chamber 14b side between the second piston 10b and the holding portion of the rod 5 for the second piston 10b
- the second piston 10b moves to the second piston chamber 14b side.
- the communication grooves 15a and 15b communicating with the piston chambers 14a and 14b) are provided in the radial direction of the pistons 10a and 10b, and a contact surface 12a which is a flat end surface of the intermediate member 12. 12b and the flat side surfaces of the pistons 10a and 10b are formed open / close paths 19a and 19b that open and close by the contact and separation of the pistons 10a and 10b with respect to the contact surfaces 12a and 12b.
- 19b cuts off the other end of the communication passages 11a and 11b and the liquid storage chamber 17, and the one-way flow passages 18a and 18b are formed by the opening and closing passages 19a and 19b and the communication passages 11a and 11b. Is formed.
- the length of the piston mounting portions 7a and 7b in the direction of the axis L is slightly larger than the thickness of the pistons 10a and 10b.
- 19a is opened, and the communication path 11a of the first rod member 6a communicates with the liquid storage chamber 17, so that the liquid in the liquid storage chamber 17 flows from the opening / closing path 19a to the communication path 11a and the communication groove 15a. It is possible to flow into the piston chamber 14a through the first one-way flow path 18a.
- the dimensional difference only needs to be such that a smooth flow of liquid can be secured through the opening / closing path 19a.
- the second piston 10b comes into contact with the contact surface 12b of the intermediate member 12, and the opening / closing path 19b is closed.
- the communication passage 11b of the rod member 6b is blocked from the liquid storage chamber 17, and no liquid flows into the liquid storage chamber 17 from the piston chamber 14b through the communication passage 11b, that is, the second one-way flow path 18b.
- the liquid in the second piston chamber 14b flows into the liquid storage chamber 17 while being given flow resistance only through the flow gap 13b around the second piston 10b, and at this time, a braking force acts. Then, the liquid flowing into the liquid storage chamber 17 acts on the first piston 10a on the rear side in the moving direction of the rod 5 and presses it toward the rear side in the moving direction of the rod 5, so that the first The piston 10a is separated from the contact surface 12a of the intermediate member 12, the opening / closing path 19a is opened, and the communication path 11a communicates with the liquid storage chamber 17. Therefore, the liquid in the liquid storage chamber 17 passes through the communication path 11a. 1 will flow into the piston chamber 14a. When the moving body collides with the second rod 6b and the second rod 6b is pushed into the liquid chamber 3, it goes without saying that the operation opposite to that described above is performed.
- the configuration of the illustrated one-way flow paths 18a and 18b is merely an example.
- the communication paths 11a and 11b are formed on the outer surfaces of the piston mounting portions 7a and 7b of the rod members 6a and 6b. It can also be formed by axial grooves provided on the inner peripheral surfaces of the pistons 10a, 10b.
- the said communication grooves 15a and 15b are provided in piston 10a, 10b, it can also be provided in the step part 9a, 9b side of rod member 6a, 6b.
- the one-way flow paths 18a and 18b are provided between the pistons 10a and 10b and the holding portions of the rods 5 of the pistons 10a and 10b.
- an independent check valve may be incorporated in the flow path that connects the front and back surfaces of the pistons 10a and 10b, or a check valve may be incorporated in the rod members 6a and 6b. In such a case, it is not always necessary to hold the pistons 10a and 10b so as to be movable in the axial direction with respect to the rod 5, and the pistons 10a and 10b may be fixedly provided to the rod 5.
- the sealing mechanisms 20A and 20B for sealing both ends of the cylinder housing 1 are provided inside the covers 4a and 4b fixed by crimping the ends of the cylinder housing 1 to both ends of the cylinder housing 1. Is provided.
- the seal mechanisms 20A and 20B include holding members 21a and 21b fixedly fitted inside the covers 4a and 4b, and are formed of O-rings in annular grooves provided on the outer peripheral surfaces of the holding members 21a and 21b. Seal members 22 a and 22 b are fitted, and the seal members 22 a and 22 b seal between the outer peripheral surfaces of the holding members 21 a and 21 b and the inner peripheral surface of the cylinder housing 1.
- rod receiving holes 23a and 23b through which the rod members 6a and 6b pass in a sliding state are formed in the half portions of the holding members 21a and 21b on the pistons 10a and 10b side, and the holding members 21a and 21b are formed. Are formed so as to function as bearings and guides for the rod members 6a and 6b. Further, in the space formed in the inner periphery of the half of the holding member 21a, 21b on the cover 4a, 4b side, seal members 24a, 24b in contact with the outer peripheral surfaces of the rod members 6a, 6b are accommodated. The members 24a and 24b seal between the inner periphery of the holding members 21a and 21b and the outer periphery of the rod members 6a and 6b, thereby preventing leakage of liquid such as oil filled in the liquid chamber 3. .
- the double rod type shock absorber of the first embodiment having the above configuration moves a pair of buffer pistons 10a and 10b in the direction of the axis L with respect to the rod 5 through the single liquid chamber 3.
- the liquid in the piston chambers 14a and 14b pressurized by one piston 10a and 10b is retained.
- the rod 5 is configured to flow into the piston chambers 14b and 14a defined by the other pistons 10b and 10a. And the other end of the rod 5 is pushed back to the return position protruding from the other end of the cylinder housing 1, and the liquid pressurized by the brake pistons 10a and 10b is discharged.
- the liquid chamber 3 flows in the direction opposite to the moving direction of the rod 5, and prepares for the collision of the next moving body with the other end of the rod 5. Therefore, the double rod type hydraulic shock absorber can stably exhibit a buffer stop function with respect to the movement of the reciprocating moving body in any direction, and the number of parts is small. In addition, the configuration is simple and the cost is reduced.
- the moving body collides with one of the pair of rod members 6a and 6b, and the pistons 10b and 10a are connected to the piston chamber 14b,
- the liquid pushed out from the piston chambers 14b and 14a flows in and flows into the other piston chambers 14a and 14b through the liquid storage chamber 17, and this liquid storage chamber 17 Since it itself forms a space through which only liquid passes, the axial length is shortened as much as possible, and in the limit it does not impair the above functions, thereby reducing the cylinder housing 1.
- the shock absorber can be reduced in size.
- the liquid storage chamber 17 is an accumulator that extends the life of the shock absorber by containing the liquid in the liquid chamber 3 in a pressurized state as in the embodiment shown in FIGS. 5 and 6 described below. It can also be used effectively.
- the intermediate member 12 between the pair of pistons 10a and 10b held on the rod 5 is connected to the rod members 6a and 6b in the same manner as in the first embodiment.
- the intermediate member 12 is provided with flanges 12d and 12e at both ends to partition the liquid storage chamber 17 formed around the intermediate member 12, and the liquid in the liquid storage chamber 17
- an annular elastic member 27 formed of a stretchable synthetic resin foam having closed cells is accommodated.
- the accumulator is comprised by forming the said liquid storage chamber 17 comparatively large, and accommodating the liquid which gave the preload so that this elastic member 27 may be compressed in the liquid chamber 3 containing this liquid storage chamber 17. I am letting.
- the function as a shock absorber is suppressed from being attenuated, and the shock absorber The life can be extended.
- the annular elastic member 27 is accommodated in the liquid storage chamber 17 formed around the intermediate member 12 as in the second embodiment.
- a liquid filling hole 28 that opens the chamber 17 to the outside is formed, and the filling hole 28 is closed with a pressure regulating plug 29 that applies a preload to the liquid inside the liquid chamber 3.
- the liquid filling hole 28 formed in the wall surface of the cylinder housing 1 is not closed by a part of the rod 5, and must always be open to the liquid chamber 3 regardless of the position of the rod 5. It is.
- the filling hole 28 has a cylindrical portion closed by an O-ring 29a of the pressure adjusting plug 29 therein, and the filling hole 28 is an O-ring 29a of the pressure adjusting plug 29 screwed into the filling hole.
- the liquid filled in the 28 cylindrical portions is press-fitted into the liquid chamber 3 so that a preload can be applied to the liquid in the liquid chamber 3.
- the rod 5 and 6 are in a state in which one rod member 6a protrudes from the cylinder housing 1 and stands by while the moving body collides with the rod member 6a, as in FIG.
- the other configurations and operations of the second and third embodiments described above with reference to the drawings are substantially the same as those of the first embodiment described with reference to FIGS. Since there is no change, the same or corresponding main parts in the drawings are denoted by the same reference numerals, and description thereof is omitted.
- the rod 5 is configured such that a pair of rod members 6a and 6b are mechanically connected by the intermediate member 12, but the rod is integrally connected. 5.
- flanges 12d and 12e are provided on both ends of the cylinder, or between the pair of pistons 10a and 10b that can move in the axial direction of the liquid chamber 3, if necessary.
- a member corresponding to the intermediate member 12 can be attached to the rod 5 as an integral or separate member.
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Abstract
Description
この特許文献3に開示の緩衝器は、実質的には、単一のピストンロッドを備えた緩衝器の二つを逆向きにして連結したものであり、しかも、両緩衝器においてピストンにより押し出される流体を、特許文献1のようにピストンの周囲の間隙を通して該ピストンの背面側に導くことなく、流路断面積を調整可能にした別設の絞り部分に導くことにより、両緩衝器において独立に流路抵抗を調整可能にしているため、シリンダ内におけるピストンの移動により負圧になる該ピストンの背面側に流体を流す流路も別途形成し、それにより両ピストンロッドによる制動力を独立に可変にしたものである。そのため、緩衝器内において一対のピストンに対して流動抵抗を与える油等の流体の流路が極端に複雑で、製造が容易ではなく、長期に亘って安定的に緩衝機能を発揮させることに困難性がある。
この場合、上記液室の内径は、上記第1のピストン室側と第2のピストン室側とで異なっていても良い。
また、上記シリンダハウジングには、上記液室の中央部となる位置に上記液体を充填するための充填孔が形成され、該充填孔は、上記液体に予圧を与える調圧プラグで塞がれていても良い。
従って、交互に往復動する移動体のいずれの方向への移動に対しても安定的に緩衝停止機能を発揮し、部品点数を減らすと共に構成の簡単化を図り、コストの低減を図った両ロッド型の油圧式ショックアブソーバを得ることができる。
以下の説明においては、上記連接ロッドを単にロッドと呼ぶこととする。
更に具体的には、図4から分かるように、上記ロッド部材6a,6bの上記中間部材12に対する連結端側には、細径化されたピストン取付部7a,7bと、上記中間部材12の螺子孔12cに螺挿するための雄ねじを有する連結部8とを順次設け、上記ピストン取付部7a,7bに上記ピストン10a,10bを摺動自在に外嵌させたうえで、上記連結部8を中間部材12の螺子孔12cに螺挿して連結している。その際、上記ピストン取付部7a,7bの軸線L方向長さをピストン10a,10bの厚さよりも若干大きくして、その寸法差の範囲内で該ピストン10a,10bが該ピストン取付部7a,7bにおいて軸線L方向に変位できるようにしている。
移動体が第2のロッド6bに衝突して該第2のロッド6bが液室3内に押入されたときには、上述したところと左右逆の動作が行われるのは勿論である。
従って、上記両ロッド型の油圧式ショックアブソーは、交互に往復動する移動体のいずれの方向への移動に対しても安定的に緩衝停止機能を発揮することができ、部品点数が少ないために構成も簡単であり、コストも低減化される。
また、図示の第1-第3実施例では、上記ロッド5を、一対のロッド部材6a,6bを中間部材12により機械的に連接したものとして構成しているが、それらを一体に連接したロッド5として構成することもでき、その場合に、必要に応じて、液室3の軸線方向に移動可能な一対のピストン10a,10bに挟まれる筒状、あるいは両端部にフランジ12d,12eを設けた中間部材12に相当するものを、ロッド5上に一体的または別体のものとして付設することができる。
3 液室
4a,4b カバー
5 ロッド
6a,6b ロッド部材
7a,7b ピストン取付部
9a,9b 段部
10a,10b ピストン
11a,11b 連通路
12 中間部材
12a,12b 当接面
13a,13b 流通間隙
14a,14b ピストン室
15a,15b 連通溝
17 蓄液室17
18a,18b 一方向流路
19a,19b 開閉路
27 弾性部材
28 充填孔
29 調圧プラグ
Claims (8)
- 液体が充填された液室を内部に有するシリンダハウジングと、該シリンダハウジングを軸線方向に貫通して一端及び他端が上記シリンダハウジングの一端及び他端から外部に液密に突出し、軸線方向に往復動する一連のロッドと、該ロッドの上記液室内に位置する部分に軸線方向の間隔を保って保持された第1及び第2のピストンと、該第1及び第2のピストンにより上記液室の一端側及び他端側に区画された第1及び第2のピストン室と、上記第1のピストンと第2のピストンとの間に形成された蓄液室と、液体に流動抵抗を与えるため上記第1及び第2のピストンの外周面と上記液室の内周面との間にそれぞれ形成された流通間隙と、上記第1及び第2のピストン室と上記蓄液室とを結ぶ開閉自在の第1及び第2の一方向流路とを有し、
上記第1及び第2の一方向流路は、上記ロッドの往復移動時に、該ロッドの移動方向前方側に位置する一方向流路が閉鎖して該移動方向前方側のピストン室から上記蓄液室に向かう液体の流れを阻止し、上記ロッドの移動方向後方側に位置する一方向流路が開放して上記蓄液室から該移動方向後方側のピストン室に向かう液体の流れを許容するように構成された、
ことを特徴とする両ロッド型ショックアブソーバ。 - 上記ロッドは、上記シリンダハウジングの一端から突出する第1のロッド部材及び他端から突出する第2のロッド部材と、これら第1のロッド部材と第2のロッド部材とを上記液室内で連結する中間部材とを有し、
上記第1及び第2のピストンは、上記第1及び第2のロッド部材の上記中間部材に隣接する位置に形成されたピストン取付部に軸線方向に変位自在なるように配設され、上記ロッドの往復動により変位して上記中間部材の一端及び他端の第1及び第2の当接面に交互に接離し、
上記第1及び第2の一方向流路は、上記第1及び第2のピストンの内周面と上記ピストン取付部の外周面との間に上記第1及び第2のピストン室に常時連通するように形成された連通路と、上記中間部材の第1及び第2の当接面と上記第1及び第2のピストンの側面との間に、上記連通路と上記蓄液室とを通断するように形成された開閉路とを有し、上記第1及び第2の当接面に対する上記第1及び第2のピストンの接離によって上記開閉路が開閉されるように構成された、
ことを特徴とする請求項1に記載の両ロッド型ショックアブソーバ。 - 上記第1及び第2のピストンの上記第1及び第2のピストン室側を向く側面と、上記ピストン取付部の端部の上記ピストンが接離する段部との間に、上記連通路を該第1及び第2のピストン室に常時連通させるための連通溝が形成されていることを特徴とする請求項2に記載の両ロッド型ショックアブソーバ。
- 上記液室の内径は、上記第1のピストン室と第2のピストン室との間の位置で最も大きく、上記第1のピストン室側及び第2のピストン室側に行くにしたがって次第に小径化されていることを特徴とする請求項1から3の何れかに記載の両ロッド型ショックアブソーバ。
- 上記液室の内径は、上記第1のピストン室側と第2のピストン室側とで異なることを特徴とする請求項4に記載の両ロッド型ショックアブソーバ。
- 上記第1及び第2のロッド部材の上記液室内を往復動する部分と、上記中間部材と、上記第1及び第2のピストンと、上記第1及び第2の一方向流路とは、上記中間部材の軸線方向の中央に対して左右対称をなしていることを特徴とする請求項2又は3に記載の両ロッド型ショックアブソーバ。
- 上記蓄液室内に、独立気泡を有する伸縮自在の発泡体で形成された弾性部材を収容し、上記液体に与圧を与えて該弾性部材を圧縮させることによってアキュムレータを構成したことを特徴とする請求項1に記載の両ロッド型ショックアブソーバ。
- 上記シリンダハウジングには、上記液室の中央部となる位置に上記液体を充填するための充填孔が形成され、該充填孔は、上記液体に予圧を与える調圧プラグで塞がれていることを特徴とする請求項7に記載の両ロッド型ショックアブソーバ。
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RU2015101708A RU2608985C2 (ru) | 2012-06-21 | 2013-05-29 | Двухштоковый амортизатор |
KR1020147036877A KR101669833B1 (ko) | 2012-06-21 | 2013-05-29 | 양 로드형 쇼크 업소버 |
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RU2608985C2 (ru) | 2017-01-30 |
US20150198212A1 (en) | 2015-07-16 |
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