WO2017022494A1

WO2017022494A1 - Cylinder apparatus

Info

Publication number: WO2017022494A1
Application number: PCT/JP2016/071357
Authority: WO
Inventors: 柴原　和晶
Original assignee: 日立オートモティブシステムズ株式会社
Priority date: 2015-07-31
Filing date: 2016-07-21
Publication date: 2017-02-09
Also published as: JPWO2017022494A1; GB2557106A; CN107850167A; CN107850167B; GB201802920D0; JP6501887B2

Abstract

Provided is a cylinder apparatus with which problems such as cost can be solved by simplifying an air vent structure and improving workability relating to assembly and machining, while maintaining air discharge performance. In a cylinder apparatus 1a, a front-side annular disc 40 is provided between a front-side end plate 4 and a cylinder 3, a cylinder-side opening 45 is provided to the front-side annular disc 40, a reservoir chamber-side opening 48, which communicates with the cylinder-side opening 45, is provided to the front-side annular disc 40, and rotation-restraining parts 27, 43 for restraining relative rotation are formed between the front-side end plate 4 and the front-side annular disc 40. The air vent structure is thereby simplified and workability relating to assembly and machining is improved while air discharge performance is maintained, which can contribute to reducing costs.

Description

Cylinder device

The present invention relates to a cylinder device as a damper used in, for example, a railway vehicle.

Various structures have been proposed for the cylinder device as a damper so as to be able to cope with the required damping force characteristics and the target vehicle to be mounted. For example, when the cylinder device is used in a railway vehicle, Since there are fewer scenes where the stroke is larger than that, it is difficult for the air to escape, and a device for removing the air is required.

For example, in Patent Document 1 as a conventional technique, as a double cylinder type horizontal hydraulic shock absorber, both ends of an outer cylinder and an inner cylinder arranged concentrically are closed by end plates, and a liquid and a gas are enclosed between the two. The gas accumulated in the corner of the liquid chamber in the inner cylinder, which is the upper side in the mounted state, around the fitting portion between at least one end of the inner cylinder and the end plate. In the multi-cylinder horizontal hydraulic shock absorber provided with an annular passage that escapes to the reservoir and an orifice for generating a damping force, the annular passage is a fitting portion between the upper portion of the end portion of the inner cylinder and the end plate The orifice communicates with the liquid chamber in the inner cylinder by a communication passage provided between the bottom of the recess and the orifice communicates with the annular passage and the reservoir at a portion of the end plate that is always in liquid. It is disclosed that it is arranged.

JP 2009-243634 A

However, in the invention according to Patent Document 1, since the recessed portion bottom as the communication path and the orifice are provided in the fitting portion of the end plate, and the length in the axial direction is required, the viewpoint of cost and weight is required. Is not preferable.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cylinder device capable of simplifying an air vent structure while maintaining air discharge performance, improving workability related to assembly and processing, and solving problems such as cost. And

A cylinder device according to an embodiment of the present invention includes a cylinder, a piston that is slidably fitted in the cylinder, an outer peripheral side of the cylinder, and forms a reservoir chamber between the cylinder. An outer cylinder, an end member for closing the end of the cylinder and the end of the outer cylinder, and an annular disk provided between the end member and the cylinder, the annular disk, or A cylinder side opening that opens into the cylinder is provided between the end member and the annular disk, and a reservoir chamber side opening that communicates with the cylinder side opening and opens into the reservoir chamber is provided in the annular disk. Provided is a rotation restricting portion that restricts relative rotation between the end member and the annular disk.

In the cylinder device according to an embodiment of the present invention, while maintaining the air discharge performance, the air venting structure can be simplified and the workability related to assembly and processing can be improved to reduce the cost.

FIG. 1 is a cross-sectional view of a cylinder device according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the peripheral structure of the front end plate in the cylinder device according to the first embodiment. FIG. 3 is an arrow view of the peripheral structure of the front end plate of FIG. 2 as viewed from the cylinder side. FIG. 4 is a front end plate of the cylinder device according to the first embodiment, (a) is a cross-sectional view taken along line AA in (b), and (b) is an arrow view seen from the cylinder side. It is. FIG. 5 is a plan view of the front annular disk. FIG. 6 is a plan view of the front side sub annular disk and the rear side sub annular disk. FIG. 7 is a cross-sectional view of the peripheral structure of the rear end plate in the cylinder device according to the first embodiment. 8 is an arrow view of the peripheral structure of the rear end plate of FIG. 7 as viewed from the cylinder side. FIG. 9 is a rear end plate of the cylinder device according to the first embodiment, (a) is an arrow view seen from the cylinder side, and (b) is a cross section taken along line BB of (a). FIG. FIG. 10 is a plan view of the rear annular disk. FIG. 11 is a sectional view in which the peripheral structure of the front end plate employed in the cylinder device according to the first embodiment is employed in a uniflow type cylinder device. FIG. 12 is a sectional view of the peripheral structure of the front end plate in the cylinder device according to the second embodiment. 13 is an arrow view of the peripheral structure of the front end plate of FIG. 12 as viewed from the cylinder side. FIG. 14 is a front end plate of the cylinder device according to the second embodiment, wherein (a) is a cross-sectional view taken along the line CC of (b), and (b) is an arrow view seen from the cylinder side. It is. FIG. 15 is a plan view of the front annular disk. FIG. 16 is a cross-sectional view of the peripheral structure of the front end plate in the cylinder device according to the third embodiment. FIG. 17 is an arrow view of the peripheral structure of the front end plate of FIG. 16 as viewed from the cylinder side. 18A and 18B are front end plates of a cylinder device according to the third embodiment, wherein FIG. 18A is a cross-sectional view taken along the line DD in FIG. 18B, and FIG. 18B is an arrow view viewed from the cylinder side. It is. FIG. 19 is a plan view of the front annular disk. FIG. 20 is a plan view of the front auxiliary annular disk. FIG. 21 is a cross-sectional view of the peripheral structure of the front end plate in the cylinder device according to the fourth embodiment. 22A is an arrow view of the peripheral structure of the front end plate of FIG. 21 as viewed from the cylinder side, and FIG. 22B is an enlarged view of the E portion of FIG. FIG. 23 is a front end plate of a cylinder device according to the fourth embodiment, (a) is a sectional view taken along line FF in (b), and (b) is an arrow view as viewed from the cylinder side. It is. FIG. 24 is a plan view of the front annular disk. FIG. 25 is a cross-sectional view of the peripheral structure of the front side end plate in the cylinder device according to the fifth embodiment. FIG. 26A is an arrow view of the peripheral structure of the front end plate of FIG. 25 as viewed from the cylinder side, and FIG. 26B is an enlarged view of the G portion of FIG. FIG. 27 is a front end plate of a cylinder device according to a fifth embodiment, (a) is a cross-sectional view taken along line HH in (b), and (b) is an arrow view seen from the cylinder side. It is. FIG. 28A is a plan view of the front annular disk, and FIG. 28B is an enlarged view of the I portion. FIG. 29A is a plan view of the front auxiliary annular disk, and FIG. 29B is an enlarged view of a J portion.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to FIGS.
The cylinder devices 1a to 1e according to the first to fifth embodiments are employed as railway vehicle yaw dampers that are mounted horizontally between a carriage and a vehicle body. First, the cylinder device 1a according to the first embodiment will be described with reference to FIGS.
As shown in FIG. 1, the cylinder device 1 a according to the first embodiment is a biflow type, and includes an outer cylinder 2 that extends in a horizontal direction in an attached state to a railway vehicle, and an outer cylinder 2 on the inner side of the outer cylinder 2. And a cylinder 3 arranged concentrically. Both ends of the outer cylinder 2 and the cylinder 3 are closed by a front end plate 4 and a rear end plate 5, respectively. An annular reservoir chamber 6 is formed between the inner wall surface of the outer cylinder 2 and the outer wall surface of the cylinder 3. The reservoir chamber 6 is filled with hydraulic oil and gas. For convenience of explanation, the following description will be made with the left side in the figure (when the sign is viewed upright), that is, the bracket 19 side as the front side, and the right side in the figure, ie, the bracket 20 side as the rear side.

As shown in FIGS. 2 to 4, the front end plate 4 closes the front end openings of the outer cylinder 2 and the cylinder 3 and also has a guide function for the piston rod 11. Is formed with a support hole 24 that supports the piston rod 11 so as to be movable along the axial direction. The front end plate 4 is a disc-shaped front outer cylinder fitting portion 25 fitted into the outer cylinder 2, and projects from the cylinder 3 side integrally with the front outer cylinder fitting portion 25. It is comprised from the disk-shaped front cylinder fitting part 26 fitted inside. On the outer peripheral surface of the front cylinder fitting portion 26, a concave rotation restricting portion 27 is formed along the axial direction at a position located at the uppermost end when the cylinder device 1a is attached to the railway vehicle.

The concave rotation restricting portion 27 is formed over the entire axial direction of the front cylinder fitting portion 26. The front view shape of the concave rotation restricting portion 27 is formed in a substantially semicircular shape. An annular sheet portion 28 that protrudes toward the cylinder 3 is formed on the surface of the front outer cylinder fitting portion 25 that faces the reservoir chamber 6. In the present embodiment, the cross-sectional shape of the annular sheet portion 28 protrudes with a predetermined width and the end surface is formed in a semicircular shape, but is not limited to this shape.

As shown in FIGS. 1 and 7 to 9, the rear end plate 5 includes a first rear end plate 31 that closes the rear end opening of the outer cylinder 2, and a second rear end opening that closes the rear end opening of the cylinder 3. A divided structure including the rear end plate 32 is formed. A bracket 20 for connection to the vehicle body side is fixed to the first rear end plate 31. The second rear end plate 32 protrudes toward the cylinder 3 integrally with the disc-shaped rear outer cylinder fitting portion 33 fitted into the outer cylinder 2 and the rear outer cylinder fitting portion 33. And a disc-shaped rear cylinder fitting portion 34 fitted in the cylinder 3. The rear outer tube fitting portion 33 of the second rear end plate 32 is integrally connected to the surface of the first rear end plate 31 on the cylinder 3 side. On the outer peripheral surface of the rear cylinder fitting portion 34, when the cylinder device 1a is attached to the railway vehicle, a concave rotation restricting portion 35 is formed along the axial direction at a position located at the uppermost end.

The concave rotation restricting portion 35 is formed over the entire axial direction of the rear cylinder fitting portion 34. The front view shape of the concave rotation restricting portion 35 is formed in a substantially semicircular shape. On the surface facing the reservoir chamber 6 of the rear outer cylinder fitting portion 33 of the second rear end plate 32, an annular sheet portion 36 protruding toward the cylinder 3 is formed. In the present embodiment, the cross-sectional shape of the annular sheet portion 36 is projected with a predetermined width and the end surface is formed in a semicircular shape, but is not limited to this shape.

As shown in FIG. 1, a piston 10 is slidably disposed in the cylinder 3. The inside of the cylinder 3 is defined by a piston 10 into a rod side oil chamber 12 and an anti-rod side oil chamber 13. Working oil (working fluid) is sealed in each of the rod-side oil chamber 12 and the anti-rod-side oil chamber 13. The piston 10 is opened according to the pressure in the rod side oil chamber 12, and the pressure regulating valve 15 that causes the hydraulic oil in the rod side oil chamber 12 to flow to the anti-rod side oil chamber 13, and the anti-rod side oil A pressure regulating valve 16 that opens according to the pressure in the chamber 13 and flows the hydraulic oil in the non-rod-side oil chamber 13 to the rod-side oil chamber 12 is disposed. One end of a piston rod 11 is connected to the piston 10, and the other end of the piston rod 11 extends through the front end plate 4 in a liquid-tight manner to the outside of the outer cylinder 2. A connecting bracket 19 that is connected to the carriage side is fixed to the other end of the piston rod 11.

A relief is provided in the second rear side end plate 32 of the rear side end plate 5 to open the hydraulic oil in the anti-rod side oil chamber 13 to the reservoir chamber 6 according to the pressure in the anti-rod side oil chamber 13. A valve 17 and a check valve 18 that allows only the flow of hydraulic oil from the reservoir chamber 6 to the anti-rod side oil chamber 13 are disposed.

As shown in FIGS. 1 and 2, a front annular disk 40 and a front auxiliary annular disk 41 (from the front end plate 4 side between the front outer cylinder fitting portion 25 of the front end plate 4 and the front end of the cylinder 3 are provided. FIG. 5 and FIG. 6 are also arranged in this order. The front annular disk 40 and the front auxiliary annular disk 41 have the same outer diameter. The outer diameters of the front annular disk 40 and the front auxiliary annular disk 41 are larger than the outer diameter of the annular seat portion 28. The inner diameters of the front annular disc 40 and the front auxiliary annular disc 41 substantially coincide with the outer diameter of the front cylinder fitting portion 26 of the front end plate 4. In this embodiment, the thickness of the front annular disk 40 and the thickness of the front auxiliary annular disk 41 are substantially the same, but the thickness of the front auxiliary annular disk 41 is made larger than the thickness of the front annular disk 40, etc. The thickness of the disk 40 may be different from the thickness of the front sub annular disk 41.

As shown in FIGS. 2, 3 and 5, a convex rotation restricting portion 43 protruding inwardly protrudes from the inner peripheral surface of the front annular disk 40. The convex rotation restricting portion 43 protrudes in a substantially semicircular shape and is fitted to a concave rotation restricting portion 27 provided on the outer peripheral surface of the front cylinder fitting portion 26. The convex rotation restricting portion 43 provided on the inner peripheral surface of the front annular disk 40 and the concave rotation restricting portion 27 provided on the outer peripheral surface of the front cylinder fitting portion 26 are formed in substantially the same shape. Thereby, the convex rotation restricting portion 43 is fitted to the concave rotation restricting portion 27 provided on the outer peripheral surface of the front cylinder fitting portion 26 without a gap. A long hole 44 having a predetermined width penetrating in the axial direction is formed in the convex rotation restricting portion 43 of the front annular disk 40. The long hole 44 extends radially outward from the convex rotation restricting portion 43. In the present embodiment, the radially outer end of the elongated hole 44 substantially coincides with the outer wall surface of the cylinder 3 in an assembled state, but may be formed longer than that. The range of the convex rotation restricting portion 43 of the long hole 44 becomes the cylinder side opening 45. Note that a notch portion may be provided on the outer peripheral surface of the convex rotation restricting portion 43, and the notch portion may be the cylinder side opening 45. On the lower part of the outer peripheral surface of the front annular disk 40, a communication projection 46 is formed at a position different from the convex rotation restricting portion 43 by 150 ° in the counterclockwise direction in FIG. The communication protrusion 46 may be formed at the lowermost portion that is 180 ° different from the convex rotation restricting portion 43. The communication protrusion 46 is formed with a long hole 47 (orifice) having a predetermined width penetrating in the axial direction. The long hole 47 extends radially inward from the communication protrusion 46. The range of the communication projection 46 of the elongated hole 47 is the reservoir chamber side opening 48.

Then, as shown in FIG. 2, a front annular disk 40 and a front auxiliary annular disk 41 are arranged between the annular seat portion 28 provided in the front outer cylinder fitting portion 25 of the front end plate 4 and the front end of the cylinder 3. Thus, the convex rotation restricting portion 43 provided on the front annular disk 40 is fitted to the concave rotation restricting portion 27 provided on the outer peripheral surface of the front cylinder fitting portion 26 without a gap. As a result, relative rotation between the front end plate 4 and the front annular disk 40 is restricted. Further, a long hole 44 formed in the range of the convex rotation restricting portion 43 provided in the front annular disk 40, that is, a cylinder side opening 45 is provided in the outer peripheral surface of the front cylinder fitting portion 26 in the rod side oil chamber 12. Opening in the range of the concave rotation restricting portion 27, the cylinder side opening 45 communicates with the rod side oil chamber 12 in the cylinder 3. In addition, a pressure chamber 50 extending in an annular shape is formed between the front outer cylinder fitting portion 25 and the front annular disk 40 inside the annular seat portion 28. The pressure chamber 50 communicates with a long hole 44 on the convex rotation restricting portion 43 side provided in the front annular disk 40 and also communicates with a long hole 47 on the communication projection 46 side provided on the front annular disk 40. A long hole 47 formed in the range of the communication projection 46 provided in the front annular disk 40, that is, a reservoir chamber side opening 48 opens into the reservoir chamber 6.

Thereby, the rod side oil chamber 12 in the cylinder 3 is annular between the cylinder side opening 45 provided in the convex rotation restricting portion 43 of the front annular disc 40, the front outer cylinder fitting portion 25 and the front annular disc 40. And the reservoir chamber 6 through a reservoir chamber side opening 48 provided in the communication projection 46 of the front annular disc 40. In the present embodiment, a communication projection 46 is provided on the outer peripheral surface of the front annular disk 40, and a long hole 47 as an orifice is provided in the communication projection 46. Without providing the projection 46, a notch communicating with the pressure chamber 50 may be provided on the outer peripheral surface thereof, and an opening (orifice) in the radial direction of the notch may be used as the reservoir chamber side opening 48.

As shown in FIGS. 7 and 8, there is a rear end plate between the rear outer cylinder fitting portion 33 provided on the second rear end plate 32 of the rear end plate 5 and the rear end of the cylinder 3. A rear annular disk 55 and a plurality of rear subsidiary annular disks 56, 56 (two rear subsidiary annular disks in this embodiment) (see also FIGS. 6 and 10) are arranged from the 5th side. The rear annular disk 55 and the rear subsidiary annular disk 56 have the same outer diameter. The outer diameters of the rear annular disc 55 and the rear sub annular disc 56 are larger than the outer diameter of the annular seat portion 36 provided in the rear outer cylinder fitting portion 33. The inner diameters of the rear annular disk 55 and each rear auxiliary annular disk 56 substantially coincide with the outer diameter of the rear cylinder fitting portion 34 of the second rear end plate 32. In the present embodiment, the thickness of the rear annular disk 55 and the thickness of the rear subsidiary annular disk 56 are substantially the same, but the thickness of the rear subsidiary annular disk 565 is made larger than the thickness of the rear annular disk 55. For example, the thickness of the rear annular disk 55 may be different from the thickness of the rear auxiliary annular disk 56.

As shown in FIGS. 7, 8, and 10, a convex rotation restricting portion 60 that protrudes inwardly protrudes from the inner peripheral surface of the rear annular disk 55. The convex rotation restricting portion 60 protrudes in a substantially semicircular shape and is fitted into a concave rotation restricting portion 35 provided on the outer peripheral surface of the rear cylinder fitting portion 34. The convex rotation restricting portion 60 provided on the inner peripheral surface of the rear annular disk 55 and the concave rotation restricting portion 35 provided on the outer peripheral surface of the rear cylinder fitting portion 34 are formed in substantially the same shape. Thereby, the convex rotation restricting portion 60 is fitted to the concave rotation restricting portion 35 provided on the outer peripheral surface of the rear cylinder fitting portion 34 without a gap. A long hole 61 is formed in the convex rotation restricting portion 60 of the rear annular disk 55 so as to penetrate in the axial direction and extend in the radial direction. The long hole 61 extends radially outward from the convex rotation restricting portion 60. In the present embodiment, the radially outer end of the elongated hole 61 substantially coincides with the outer wall surface of the cylinder 3 in the assembled state, but may be formed longer than that. The range of the convex rotation restricting portion 60 of the long hole 61 becomes the cylinder side opening 62. Note that a cutout portion may be provided on the outer peripheral surface of the convex rotation restricting portion 60, and the cutout portion may be the cylinder side opening 62. On the outer peripheral surface of the rear annular disk 55, a notch 63 is formed at the lowest portion that is 180 ° different from the convex rotation restricting portion 43. A portion (orifice) opening in the radial direction of the notch 63 is a reservoir chamber side opening 64.

As shown in FIG. 7, a rear annular disk 55 and two sheets are provided between the annular sheet portion 36 provided in the rear outer cylinder fitting portion 33 of the second rear end plate 32 and the rear end of the cylinder 3. The rear

sub-annular disks

56, 56 are arranged, and the convex rotation restricting portion 60 provided on the rear annular disc 55 is formed without a gap between the concave rotation restricting portion 35 provided on the outer peripheral surface of the rear cylinder fitting portion 34. Mating. As a result, the relative rotation between the rear end plate 5 and the rear annular disk 55 is restricted. Further, a long hole 61 formed in the range of the convex rotation restricting portion 60 provided in the rear annular disk 55, that is, the cylinder side opening 62 is the outer peripheral surface of the rear cylinder fitting portion 34 in the anti-rod side oil chamber 13. The cylinder-side opening 62 communicates with the anti-rod-side oil chamber 13 in the cylinder 3.

Further, a pressure chamber 65 extending in an annular shape is formed between the rear outer cylinder fitting portion 33 and the rear annular disk 55 inside the annular seat portion 36. The pressure chamber 65 communicates with a long hole 61 provided in the rear annular disk 55 and also communicates with a notch 63 provided in the rear annular disk 55. A reservoir chamber side opening 64 that opens in the radial direction of the notch 63 provided in the rear annular disk 55 communicates with the reservoir chamber 6. Thereby, the rod side oil chamber 12 in the cylinder 3 is located between the cylinder side opening 62 provided in the convex rotation restricting portion 60 of the rear annular disk 55, the rear outer cylinder fitting portion 33 and the rear annular disk 55. The pressure chamber 65 extends annularly and communicates with the reservoir chamber 6 through a reservoir chamber side opening 64 of a notch 63 provided on the outer peripheral surface of the rear annular disk 55.

Next, the operation of the cylinder device 1a according to the first embodiment will be described.
The cylinder device 1a according to the present embodiment is mounted horizontally between the carriage and the vehicle body, the bracket 19 on the piston rod 11 side is connected to the carriage, and the bracket 20 on the outer cylinder 2 side is connected to the vehicle body. Is done.
Thereafter, when the carriage and the vehicle body move relative to each other in the horizontal direction, the piston rod 11 of the cylinder device 1a expands and contracts. During the extension stroke of the piston rod 11, the hydraulic oil in the rod side oil chamber 12 is opened via the pressure regulating valve 15 by the pressure regulating valve 15 provided in the piston 10 being opened according to the pressure in the rod side oil chamber 12. Then, it flows to the anti-rod side oil chamber 13 and an extension side damping force is generated accordingly. During the extension stroke, the hydraulic oil for the withdrawal of the piston rod 11 passes from the reservoir chamber 6 to the anti-rod side oil chamber 13 via the check valve 18 provided on the second rear end plate 32 of the rear end plate 5. To be replenished.

At this time, the air accumulated in the corner portion of the front end within the concave rotation restricting portion 27 of the front cylinder fitting portion 26 of the front end plate 4 together with the hydraulic oil in the rod side oil chamber 12, the inside of the rod side oil chamber 12 → the front side The cylinder side opening 45 provided in the convex rotation restricting portion 43 of the annular disk 40 → the pressure chamber 50 extending in an annular shape between the front outer cylinder fitting part 25 and the front annular disk 40 → the communication protrusion 46 of the front annular disk 40. The reservoir chamber-side opening 48 provided in (a long hole 47 which is an orifice) is discharged to the reservoir chamber 6. Further, a damping force is generated when the hydraulic oil flows through this path, particularly when flowing through the orifice 47.

Further, when the pressure in the rod oil side chamber 12 in the cylinder 3 reaches a predetermined value or more, the pressure in the pressure chamber 50 extending annularly between the front outer cylinder fitting portion 25 and the front annular disk 40 becomes more than a predetermined value. The front annular disk 40 and the front auxiliary annular disk 41 are elastically deformed so as to be separated from the annular seat portion 28, and the hydraulic oil in the rod-side oil chamber 12 is relieved from the pressure chamber 50 to the reservoir chamber 6. become. As described above, the front annular disk 40 and the front auxiliary annular disk 41 are reliefs that relieve the hydraulic oil from the pressure chamber 50 to the reservoir chamber 6 when the pressure of the hydraulic oil in the rod-side oil chamber 12 reaches a predetermined pressure. Also acts as a valve.

On the other hand, during the contraction stroke of the piston rod 11, the hydraulic oil in the anti-rod side oil chamber 13 is opened by the pressure regulating valve 16 provided in the piston 10 according to the pressure in the anti-rod side oil chamber 13. And then flows into the rod side oil chamber 12 and a contraction-side damping force is generated accordingly. During this contraction stroke, the hydraulic oil that has entered the piston rod 26 flows from the anti-rod side oil chamber 13 into the reservoir chamber 6 via the relief valve 17 provided on the second rear side member of the rear end plate 5. At this time, a damping force is generated.

At this time, the air accumulated in the corner of the rear end in the concave rotation restricting portion 35 of the rear cylinder fitting portion 34 of the rear end plate 5 is combined with the hydraulic oil in the anti-rod side oil chamber 13 and the anti-rod side oil. Inside the chamber 13 → Cylinder side opening 62 provided in the convex rotation restricting portion 60 of the rear annular disk 55 → Pressure chamber 65 extending annularly between the rear outer cylinder fitting portion 33 and the rear annular disk 55 → rear The reservoir chamber side opening (orifice) 64 provided in the side annular disk 55 is discharged to the reservoir chamber 6. Further, when the hydraulic fluid flows through this path, particularly when the hydraulic fluid flows through the orifice 64 which is the reservoir chamber side opening, a damping force is generated.

Further, the pressure in the pressure chamber 65 extending in a ring shape between the rear outer cylinder fitting portion 33 and the rear annular disk 55 when the pressure in the anti-rod side oil chamber 13 in the cylinder 3 reaches a predetermined value or more. Reaches the predetermined value or more, the rear annular disk 55 and the rear auxiliary

annular disks

56, 56 are elastically deformed so as to be separated from the annular seat portion 36, and the hydraulic oil in the anti-rod side oil chamber 13 is supplied to the pressure chamber. Relief comes from 65 to the reservoir chamber 6. As described above, when the pressure of the hydraulic oil in the anti-rod side oil chamber 13 reaches a predetermined pressure, the front annular disc 40 and the rear auxiliary

annular discs

56 and 56 transfer the hydraulic oil from the pressure chamber 65 to the reservoir chamber 6. Also acts as a relief valve for relief.

The peripheral structure of the front end plate 4 employed in the cylinder device 1a according to the first embodiment can also be employed in the uniflow type cylinder device 1a 'shown in FIG.
That is, as shown in FIG. 11, in the cylinder device 1a ′, the piston 10 is provided with a check valve 67 that allows only the flow of hydraulic oil from the anti-rod side oil chamber 13 to the rod side oil chamber 12. ing. The second rear end plate 32 of the rear end plate 5 is provided with a check valve 68 that allows only the flow of hydraulic oil from the reservoir chamber 6 to the anti-rod side oil chamber 13. The front end plate 4 is provided with a pressure regulating valve 69 that opens according to the pressure in the rod-side oil chamber 12 and flows the working oil in the rod-side oil chamber 12 to the reservoir chamber 6.

During the extension stroke of the piston rod 11, the hydraulic oil in the rod side oil chamber 12 is opened to the reservoir chamber 6 by the pressure regulating valve 69 provided on the front end plate 4 according to the pressure in the rod side oil chamber 12. It flows, and the damping force on the expansion side is generated accordingly. Note that during this extension stroke, the hydraulic oil corresponding to the retraction of the piston rod 11 passes from the reservoir chamber 6 to the anti-rod side oil chamber 13 via the check valve 68 provided on the second rear end plate 32 of the rear end plate 5. To be replenished. On the other hand, during the contraction stroke of the piston rod 11, the hydraulic oil in the anti-rod side oil chamber 13 flows into the rod side oil chamber 12 through the check valve 67 provided in the piston 10, and the inside of the anti-rod side oil chamber 13 and the rod The pressure in the side oil chamber 12 becomes the same pressure, and the hydraulic oil corresponding to the ingress of the piston rod 26 flows into the reservoir chamber 6 through the pressure regulating valve 69 provided in the front end plate 4, and the contraction side damping is accordingly performed. Force is generated.

Thus, the air accumulated in the corner of the front end in the concave rotation restricting portion 27 of the front cylinder fitting portion 26 of the front end plate 4 together with the hydraulic oil in the rod side oil chamber 12 in both the extension stroke and the contraction stroke. Rod side oil chamber 12 → Cylinder side opening 45 provided in the convex rotation restricting portion 43 of the front annular disc 40 → Pressure chamber 50 extending annularly between the front outer cylinder fitting portion 25 and the front annular disc 40 → Front annular The reservoir chamber side opening 48 (long hole 47 which is an orifice) provided in the communication projection 46 of the disk 40 is discharged to the reservoir chamber 6. Further, a damping force is generated when the hydraulic oil flows through this path, particularly when flowing through the orifice 47.

Next, a cylinder device 1b according to a second embodiment will be described with reference to FIGS. When the cylinder device 1b according to the second embodiment is described, differences from the cylinder device 1a according to the first embodiment will be mainly described.
In the cylinder device 1b according to the second embodiment, an annular seat portion 28 provided in the front outer cylinder fitting portion 25 of the cylinder device 1a according to the first embodiment is provided in the front outer cylinder fitting portion 25 of the front end plate 4. Not equipped.

In the cylinder device 1b according to the second embodiment, a cylinder communication groove 72 extending from the convex rotation restricting portion 43 toward the radially outer side is formed on the surface of the front annular disk 40 on the cylinder 3 side. The cylinder communication groove 72 is formed so that its opening width gradually increases toward the radially outer side. A range of the cylinder communication groove 72 formed in the convex rotation restricting portion 43 is a cylinder side opening 45. A reservoir chamber communication groove 73 extending radially inward from the communication protrusion 46 is formed on the surface of the front annular disk 40 on the cylinder 3 side. The reservoir chamber communication groove 73 has the same opening width and is smaller than the minimum opening width of the cylinder communication groove 72. The reservoir chamber side communication groove 73 functions as an orifice. The reservoir chamber side opening 48 is a range formed in the communication chamber projection groove 46 of the reservoir chamber communication groove 73. The annular surface on the cylinder 3 side of the front annular disk 40 is circumferentially connected so that the radially outer end of the cylinder communication groove 72 and the radially inner end of the reservoir chamber communication groove 73 communicate with each other. A communication groove 74 extending and having a predetermined width is formed. The depth of the cylinder communication groove 72, the depth of the reservoir chamber communication groove 73, and the depth of the communication groove 74 are substantially the same. The depth of the cylinder communication groove 72, the depth of the reservoir chamber communication groove 73, and the depth of the communication groove 74 may be different.

A front annular disk 40 and a front auxiliary annular disk 41 are arranged between the front outer cylinder fitting portion 25 of the front end plate 4 and the front end of the cylinder 3, and are provided on the outer peripheral surface of the front cylinder fitting portion 26. The convex rotation restricting portion 43 provided on the front annular disk 40 is fitted into the concave rotation restricting portion 27 without any gap. As a result, relative rotation between the front end plate 4 and the front annular disk 40 is restricted. Further, a cylinder communication groove 72 formed in the range of the convex rotation restricting portion 43 of the front annular disk 40, that is, a cylinder side opening 45 is provided on the outer peripheral surface of the front cylinder fitting portion 26 in the rod side oil chamber 12. It opens to the range of the concave rotation restricting portion 27 and communicates with the rod side oil chamber 12 in the cylinder 3.

Also, the communication groove 74 provided in the front annular disk 40 functions as the pressure chamber 50. Furthermore, a reservoir chamber communication groove 73 formed in the range of the communication projection 46 of the front annular disk 40, that is, a reservoir chamber side opening 48 opens into the reservoir chamber 6. As a result, the rod-side oil chamber 12 in the cylinder 3 extends in the circumferential direction provided in the cylinder-side opening 45 (cylinder communication groove 72) provided in the convex rotation restricting portion 43 of the front annular disc 40 and the front annular disc 40. It communicates with the reservoir chamber 6 via the pressure chamber 50 as the extending communication groove 74 and the reservoir chamber side opening 48 (reservoir chamber communication groove 73) provided in the communication protrusion 46 of the front annular disk 40.

Next, the operation of the cylinder device 1b according to the second embodiment will be described.
In particular, during the extension stroke of the piston rod 11, the air accumulated in the corner portion of the front end within the concave rotation restricting portion 27 of the front cylinder fitting portion 26 of the front end plate 4 together with the hydraulic oil in the rod side oil chamber 12 Pressure in the side oil chamber 12 → cylinder side opening 45 provided in the convex rotation restricting portion 43 of the front annular disc 40 → cylinder communication groove portion 72 of the front annular disc 40 → pressure as the communication groove portion 74 provided in the front annular disc 40 From the chamber 50 to the reservoir chamber communication groove 73 as an orifice provided in the front annular disk 40 → the reservoir chamber side opening 48 provided in the communication projection 46 of the front annular disk 40 → discharged to the reservoir chamber 6. Further, when the hydraulic fluid flows through this path, particularly when the hydraulic fluid flows through the reservoir chamber communication groove 73 as an orifice, a damping force is generated.

Further, when the pressure in the pressure chamber 50 as the communication groove 74 provided in the front annular disk 40 reaches a predetermined value or more, the outer peripheral portion of the front auxiliary annular disk 41 is elastically deformed so as to be separated from the front annular disk 40. Thus, the hydraulic oil in the rod side oil chamber 12 is relieved from the pressure chamber 50 to the reservoir chamber 6. In this manner, the front side sub annular disk 41 functions as a relief valve that relieves the hydraulic oil from the pressure chamber 50 to the reservoir chamber 6 when the pressure of the hydraulic oil in the rod side oil chamber 12 reaches a predetermined pressure.

Next, a cylinder device 1c according to a third embodiment will be described with reference to FIGS. When the cylinder device 1c according to the third embodiment is described, differences from the cylinder device 1b according to the second embodiment will be mainly described.
In the cylinder device 1c according to the third embodiment, a reservoir chamber communication groove 73 extending radially inward from the communication protrusion 46 is formed. The reservoir chamber communication groove 73 is formed with the cylinder communication groove 72. Similarly, the opening width is formed so as to gradually increase toward the radially outer side. Further, a communication groove 74 that communicates the radially outer end of the cylinder communication groove 72 and the radially inner end of the reservoir chamber communication groove 73, at a site close to the cylinder communication groove 72. An orifice 75 having a small opening width is formed.

Further, in the cylinder device 1c according to the third embodiment, a locking groove portion 78 as a movement restricting portion is formed on the front end outer peripheral surface of the front cylinder fitting portion 26 of the front end plate 4 and extends in an annular shape. The locking groove 78 is formed over the entire circumference of the front cylinder fitting portion 26. The width along the axial direction of the locking groove 78 substantially matches the dimension of the thickness of the front annular disk 40 and the thickness of the front auxiliary annular disk 41. The locking groove 78 is formed in a U shape. The locking groove 78 may be formed in a U shape or a triangular shape.
A plurality of locking claw portions 79 as movement restricting portions are formed on the inner peripheral surface of the front annular disk 40. A plurality of the locking claws 79 are formed at intervals along the circumferential direction. The thickness of each locking claw 79 is substantially the same as the thickness of the front annular disk 40. Each locking claw 79 is formed in a triangular shape in plan view. In addition, the planar view shape of each latching claw part 79 may be rectangular or semicircular. In this embodiment, four places are formed at equal intervals. A plurality of locking claws 79 are also formed on the inner peripheral surface of the front auxiliary annular disk 41. A plurality of the locking claws 79 are formed at intervals along the circumferential direction. The thickness of each locking claw portion 79 is substantially the same as the thickness of the front side auxiliary annular disk 41. Each locking claw 79 is formed in a triangular shape in plan view. In addition, the planar view shape of each latching claw part 79 may be rectangular or semicircular. In this embodiment, four places are formed at equal intervals. The protruding amount of each locking claw 79 of the front annular disk 40 and the front auxiliary annular disk 41 is substantially the same as the depth of the locking groove 78 provided in the front cylinder fitting part 26.

The front annular disc 40 and the front sub annular disc 41 are arranged around the front end of the front cylinder fitting portion 26 of the front end plate 4, and the front annular disc 40 is inserted into the locking groove 78 provided in the front cylinder fitting portion 26. And each latching claw part 79 of the front side sub annular disk 41 is fitted. Accordingly, relative movement along the axial direction of each of the front end plate 4, the front annular disk 40, and the front auxiliary annular disk 41 is restricted. As a result, when the cylinder device 1c is assembled, the front end plate 4 is incorporated in a state where the hydraulic oil in the outer cylinder 2 is full. At this time, the front cylinder fitting portion 26 of the front end plate 4 Since the annular disk 40 and the front auxiliary annular disk 41 can be assembled in a fitted state, workability is improved.

Next, the operation of the cylinder device 1c according to the third embodiment will be described.
In particular, during the extension stroke of the piston rod 11, the air accumulated in the corner portion of the front end within the concave rotation restricting portion 27 of the front cylinder fitting portion 26 of the front end plate 4 together with the hydraulic oil in the rod side oil chamber 12 In the side oil chamber 12 → the cylinder side opening 45 provided in the convex rotation restricting portion 43 of the front annular disk 40 → the cylinder communication groove 72 provided in the front annular disk 40 → the communication groove portion 74 provided in the front annular disk 40 Orifice 75 → Communication groove 74 as pressure chamber 50 → Reservoir chamber communication groove 73 provided in the front annular disk 40 → Reservoir chamber side opening 48 provided in the communication projection 46 of the front annular disk 40 → Reservoir chamber 6 Discharged. Further, when hydraulic fluid flows through this path, a damping force is generated particularly when flowing through the orifice 75 provided in the communication groove 74 of the front annular disk 40.

Next, a cylinder device 1d according to a fourth embodiment will be described with reference to FIGS. When the cylinder device 1d according to the fourth embodiment is described, differences from the cylinder device 1a according to the first embodiment will be mainly described.
In the cylinder device 1d according to the fourth embodiment, the cylinder 3 side surface of the front outer cylinder fitting portion 25 of the front end plate 4 (the surface on which the front annular disk 40 abuts) has a predetermined width and extends in a ring shape. A one-communication groove 81 is formed. The first communication groove 81 is arranged at the position of the reservoir chamber 6 in the radial direction. A second communication groove 82 extending linearly in a radial direction from the front end of the concave rotation restricting portion 27 provided on the outer peripheral surface of the front cylinder fitting portion 26 is formed on the surface of the front outer cylinder fitting portion 25 on the cylinder 3 side. It is formed. The second communication groove 82 communicates with the first communication groove 81. The first and second

communication groove portions

81 and 82 are formed in a U shape. The first communication groove 81 is formed deeper than the second communication groove 82. The depth of the first communication groove 81 and the depth of the second communication groove 82 may be substantially the same. The first and second

communication groove portions

81 and 82 may be formed in a U shape or a triangular shape. The second communication groove 82 functions as the pressure chamber 50. In FIG. 22, the first communication groove portion 81 communicates with the second communication groove portion 82 (concave rotation restricting portion 27), and only the range of 150 ° from the second communication groove portion 82 is counterclockwise. And may be communicated with a notch 85 provided on the outer peripheral surface of the front annular disk 40, which will be described later.

A convex rotation restricting portion 43 is formed on the inner peripheral surface of the front annular disk 40, and the protruding amount of the convex rotation restricting portion 43 is a concave rotation provided on the outer peripheral surface of the front cylinder fitting portion 26. It is formed smaller than the depth to the bottom of the restricting portion 27. Thus, when the convex rotation restricting portion 43 provided on the front annular disk 40 is fitted to the concave rotation restricting portion 27 provided on the outer peripheral surface of the front cylinder fitting portion 26, the tip of the convex rotation restricting portion 43 and the concave shape A clearance 83 is formed between the bottom of the rotation restricting portion 27, and this clearance 83 becomes the cylinder side opening 45. On the other hand, a cutout portion 85 as an orifice is formed on the outer peripheral surface of the front annular disk 40 at a position that is 150 ° different from the convex rotation restricting portion 43 in the counterclockwise direction in FIG. The notch 85 communicates with a first communication groove 81 provided on the cylinder 3 side surface of the front outer cylinder fitting portion 25 of the front end plate 4. A portion opening in the radial direction of the notch 85 is a reservoir chamber side opening 48.

A front annular disk 40 and a front auxiliary annular disk 41 are arranged between the front outer cylinder fitting portion 25 of the front end plate 4 and the front end of the cylinder 3, and are provided on the outer peripheral surface of the front cylinder fitting portion 26. The convex rotation restricting portion 43 provided on the front annular disk 40 is fitted into the concave rotation restricting portion 27. As a result, relative rotation between the front end plate 4 and the front annular disk 40 is restricted. The rod side oil chamber 12 in the cylinder 3 is a gap 83 provided between the tip of the convex rotation restricting portion 43 of the front annular disk 40 and the bottom of the concave rotation restricting portion 27 of the front cylinder fitting portion 26. A certain cylinder side opening 45, a second communication groove portion 82 provided in the front outer cylinder fitting portion 25, a pressure chamber 50 and a front annular disk 40 as the first communication groove portion 81 provided in the front outer cylinder fitting portion 25. It communicates with the reservoir chamber 6 through a reservoir chamber side opening 48 that opens in the radial direction of the notch 85 provided.

Next, the operation of the cylinder device 1d according to the fourth embodiment will be described.
In particular, during the extension stroke of the piston rod 11, the air accumulated in the corner portion of the front end within the concave rotation restricting portion 27 of the front cylinder fitting portion 26 of the front end plate 4 together with the hydraulic oil in the rod side oil chamber 12 Inside the side oil chamber 12 → cylinder side opening 45 which is a gap 83 provided between the tip of the convex rotation restricting portion 43 of the front annular disk 40 and the bottom of the concave rotation restricting portion 27 of the front cylinder fitting portion 26 → front side The second communication groove 82 provided in the outer cylinder fitting portion 25 → the pressure chamber 50 as the first communication groove portion 81 provided in the front outer cylinder fitting portion 25 → the notch as an orifice provided in the front annular disk 40 It is discharged from the reservoir chamber side opening 48 opened toward the radial direction of the portion 85 to the reservoir chamber 6. Further, when the hydraulic fluid flows in this path, a damping force is generated particularly when flowing in the notch portion 85 as an orifice provided in the front annular disk 40.

Further, when the pressure in the pressure chamber 50 as the first communication groove 81 provided in the front annular disk 40 reaches a predetermined value or more, the outer peripheral parts of the front annular disk 40 and the front auxiliary annular disk 41 are fitted to the front outer cylinder. The hydraulic oil in the rod side oil chamber 12 is elastically deformed so as to be separated from the cylinder 3 side surface of the portion 25, and the hydraulic oil in the rod side oil chamber 12 is relieved from the pressure chamber 50 to the reservoir chamber 6. Thus, when the pressure of the hydraulic oil in the rod side oil chamber 12 reaches a predetermined pressure, the front annular disk 40 and the front auxiliary annular disk 41 relieve the hydraulic oil from the pressure chamber 50 to the reservoir chamber 6. Acts as a valve.

Next, a cylinder device 1e according to a fifth embodiment will be described with reference to FIGS. When the cylinder device 1e according to the fifth embodiment is described, differences from the cylinder device 1a according to the first embodiment will be mainly described.
In the cylinder device 1e according to the fifth embodiment, the concave rotation restricting portion 27 provided on the outer peripheral surface of the front cylinder fitting portion 26 of the front end plate 4 extends linearly in the radial direction and the bottom portion is formed in a substantially semicircular shape. Is done. The opening width of the concave rotation restricting portion 27 is set to the diameter of a semicircular portion 100 provided at the tip of the convex rotation restricting portion 43 described later, and the semicircular bottom portion is a semicircle of the convex rotation restricting portion 43. It corresponds to the shape part 100. A locking groove 78 extending in an annular shape is formed on the outer peripheral surface of the front end of the front cylinder fitting portion 26 of the front end plate 4. The locking groove 78 is formed over the entire circumference of the front cylinder fitting portion 26. The width along the axial direction of the locking groove portion 78 corresponds to a dimension in which the thickness of the front annular disk 40 and the thickness of the front auxiliary annular disk 41 are combined. The locking groove 78 is formed in a U shape. The locking groove 78 may be formed in a U shape or a triangular shape. As will be described in detail later, in the range facing the inner peripheral surface of the front annular disk 40 at the bottom of the locking groove 78 and in FIG. 26, the range of 150 ° in the counterclockwise direction from the concave rotation restricting portion 27. However, there are cases where the cylinder side opening 45 and the reservoir chamber side opening 48 communicate with each other as a communication groove 90. Each locking claw portion 79 of the front annular disk 40 and each locking claw portion 79 of the front sub-annular disk 41 to be described later are fitted into the range of the other locking groove 78.

The convex rotation restricting portion 43 provided on the inner peripheral surface of the front annular disk 40 is integrally connected to the semicircular portion 100 at the tip portion and the linear range of the semicircular portion 100, and the semicircular portion 100. And a straight portion 101 having a width smaller than the diameter and extending in the radial direction. The linear portion 101 is formed near one end in the radial direction of the semicircular portion 100. The length of the linear portion 101 in the radial direction is substantially the same as the depth of the locking groove portion 78 provided on the outer peripheral surface of the front cylinder fitting portion 26. As described above, the semicircular portion 100 provided at the tip of the convex rotation restricting portion 43 substantially coincides with the semicircular bottom portion of the concave rotation restricting portion 27 of the front cylinder fitting portion 26. Further, on the lower part of the outer peripheral surface of the front annular disk 40, a communication projection 46 is formed at a position different from the convex rotation restricting portion 43 in the counterclockwise direction in FIG. A notch 102 is formed on the inner peripheral surface of the front annular disk 40 toward the radially outer side, and the notch 102 is formed from the inner peripheral surface of the front annular disk 40 to the communication protrusion 46. Is done. In the notch 102, an orifice 110 having a narrow opening width is formed in a range on the communication protrusion 46 side with a substantially intermediate position along the radial direction as a boundary. In the notch 102, the range of the communication protrusion 46, that is, the orifice 110 becomes the reservoir chamber side opening 48.

A plurality of locking claws 79 are formed on the inner peripheral surface of the front annular disk 40. The thickness of each locking claw 79 is substantially the same as the thickness of the front annular disk 40. A plurality of the locking claws 79 are formed at intervals along the circumferential direction, but in a range of 150 ° from the convex rotation restricting portion 43 to the counterclockwise direction from the convex rotation restricting portion 43 in FIG. The latching claw portion 79 is not formed on. In other words, a plurality of the locking claws 79 are formed at intervals from the convex rotation restricting portion 43 in the range of 210 ° in the clockwise direction in FIG. In this embodiment, the locking claw portions 79 are formed at three locations.

On the inner peripheral surface of the front sub-annular disk 41, the semicircular part 100 and the linear part 105 have the same shape as the convex rotation restricting part 43 at a position corresponding to the convex rotation restricting part 43 of the front annular disk 40. A protruding portion 105 is formed. A plurality of locking claws 79 are formed on the inner peripheral surface of the front sub annular disk 41 at intervals in the circumferential direction. The thickness of each locking claw portion 79 is substantially the same as the thickness of the front side auxiliary annular disk 41. In the present embodiment, the locking claw portions 79 are formed at four locations.
The protruding amount of each locking claw portion 79 of the front side annular disk 40 and the front side secondary annular disk 41 is formed smaller than the depth of the locking groove portion 78 provided in the front cylinder fitting portion 26. The protruding amount of each locking claw 79 and the depth of the locking groove 78 provided in the front cylinder fitting portion 26 may be substantially the same. In the present embodiment, the protrusion 105 is also provided on the front auxiliary annular disk 41, but the protrusion 105 is not necessarily provided.

When the front annular disc 40 and the front sub annular disc 41 are arranged between the front outer cylinder fitting portion 25 of the front end plate 4 and the front end of the cylinder 3, a locking groove portion 78 provided in the front cylinder fitting portion 26. Thus, the engaging claw portions 79 of the front annular disk 40 and the engaging claw portions 79 of the front auxiliary annular disk 41 are fitted in ranges other than the communication groove 90 formed in the predetermined range. As a result, the relative movement of the front end plate 4, the front annular disk 40 and the front auxiliary annular disk 41 along the axial direction of each other is restricted. Further, the inner wall surface of the concave rotation restricting portion 27 of the front cylinder fitting portion 26, the side surface of the linear portion 101 of the convex rotation restricting portion 43 of the front annular disk 40, and the semicircular portion of the convex rotation restricting portion 43. A space 106 is formed in a range surrounded by the linear range 102, and the space 106 becomes the cylinder side opening 45. The cylinder side opening 45 communicates with the rod side oil chamber 12 in the cylinder 3. The cylinder side opening 45 communicates with a locking groove 78 provided in the front cylinder fitting portion 26. The locking groove portion 78 communicates with the cutout portion 102 of the front annular disk 40. A range formed in the communication protrusion 46 of the notch 102 is a reservoir chamber side opening 48, which communicates with the reservoir chamber 6.
In the embodiment in which the protruding amount of each locking claw portion 79 of the front annular disk 40 and the front auxiliary annular disk 41 is substantially the same as the depth of the locking groove 78 provided in the front cylinder fitting portion 26, In the locking groove 78, the cylinder side opening 45 is in a range where the bottom of the locking groove 78 faces the inner peripheral surface of the front annular disk 40, and in FIG. 26, a range of 150 ° counterclockwise from the concave rotation restricting portion 27. It functions as a communication groove 90 that communicates with the reservoir chamber side opening 48.

Next, the operation of the cylinder device 1e according to the fifth embodiment will be described.
In particular, during the extension stroke of the piston rod 11, the air accumulated in the corner portion of the front end within the concave rotation restricting portion 27 of the front cylinder fitting portion 26 of the front end plate 4 together with the hydraulic oil in the rod side oil chamber 12 In the side oil chamber 12 → the cylinder side opening 45 which is a space 106 between the concave rotation restricting portion 27 of the front cylinder fitting portion 26 and the convex rotation restricting portion 43 of the front annular disk 40 → the front cylinder fitting portion 26 The provided locking groove 78 → the notch 102 provided in the front annular disk 40 → the orifice 110 of the notch 102 → the reservoir chamber side opening 48 which is a range formed in the communication projection 46 of the orifice 110 → the reservoir chamber 6 is discharged. In the present embodiment, the protruding amounts of the engaging claw portions 79 of the front side annular disc 40 and the front side secondary annular disc are formed smaller than the depth of the engaging groove portion 78 provided in the front cylinder fitting portion 26. Therefore, the hydraulic oil flows from the cylinder side opening 45 into the locking groove 78 provided in the front cylinder fitting portion 26 and fills the entire area of the locking groove 78.

Further, in the embodiment in which the protruding amount of each locking claw portion 79 of the front annular disk 40 and the front auxiliary annular disk is the same as the depth of the locking groove 78 provided in the front cylinder fitting portion 26, the hydraulic oil is The cylinder side opening 45 flows into the locking groove portion 78 provided in the front cylinder fitting portion 26 and flows through the communication groove portion 90 within the predetermined range of the locking groove portion 78, so that the orifice of the notch portion 102 is flown. It flows into the reservoir chamber 6 through 110 and the reservoir chamber side opening 48. Furthermore, a damping force is generated when the hydraulic oil flows through this path, particularly when flowing through the orifice 110 of the notch 102 provided in the front annular disk 40.
Note that the cylinder device 1e according to the fifth embodiment is not provided with locations corresponding to the

pressure chambers

50 and 65 provided in the cylinder devices 1a to 1d according to the first to fourth embodiments, and the front annular disk is not provided. 40 and the front auxiliary annular disk 41 do not function as a relief valve.

Further, when the front annular disc 40 and the front sub annular disc 41 are arranged around the front end of the front cylinder fitting portion 26 of the front end plate 4, the front annular disc 40 and the front annular disc 40 and the locking groove 78 provided in the front cylinder fitting portion 26 are arranged. Each locking claw portion 79 of the front side sub annular disk 41 is fitted. Accordingly, relative movement along the axial direction of each of the front end plate 4, the front annular disk 40, and the front auxiliary annular disk 41 is restricted.

In the cylinder device 1e according to the fifth embodiment, the communication protrusion 46 is provided on the outer peripheral surface of the front annular disk 40, and the orifice 110 is provided in the range of the communication protrusion 46. 46, the notch 102 is formed in the orifice 110 having a narrow width in the entire radial direction so that the radially outer end of the notch 102 (orifice 110) faces the reservoir chamber 6. In this case, it is not necessary to provide the front side secondary annular disk 41.

In the cylinder devices 1a to 1e according to the first to fifth embodiments described above, in particular, the front annular disc 40 is provided between the front end plate 4 and the front end of the cylinder 3, and the front annular disc 40 or the front side is provided. A cylinder side opening 45 that opens into the cylinder 3 is provided between the end plate 4 and the front annular disk 40, and a reservoir chamber that communicates with the cylinder side opening 45 and opens into the reservoir chamber 6. A side opening 48 is provided, and between the front end plate 4 and the front annular disk 40,

rotation restricting portions

27 and 43 that restrict relative rotation of each other are formed. Thereby, the front end plate 4 and the front annular disk 40 can be positioned in the rotational direction, and the cylinder side opening 45 can be positioned at the uppermost end when the cylinder devices 1a to 1e are attached to the target vehicle. Can be arranged.

Therefore, in the invention according to the conventional patent document 1, machining for providing an orifice in the fitting portion of the end plate is complicated, which is not preferable from the viewpoint of cost. Further, there is no liquid between the fitting portion of the end plate and the cylinder. An O-ring is used to tightly seal, but the elasticity of the O-ring may cause a delay in response particularly at high pressure, and the assembly work of the O-ring is troublesome and needs to be improved. There was a problem. As a result of the configuration of the present invention, the air accumulated in the corner portion between the front end plate 4 and the front end of the cylinder 3 along with the working oil in the rod side oil chamber 12 during the extension stroke of the piston rod 11, particularly the rod The air is discharged from the side oil chamber 12 to the reservoir chamber 6 through the cylinder side opening 45 and the reservoir chamber side opening 48, and the air discharge performance can be maintained. Moreover, as the air vent structure, the front annular disc 40 or the cylinder side opening 45 is provided between the front end plate 4 and the front annular disc 40, and the reservoir chamber side opening 48 is provided in the front annular disc 40. In addition, it is not necessary to provide an O-ring as in the conventional case, and processing on the front end plate 4 is minimized, so that workability is improved, and thus it is possible to contribute to cost reduction.

In the cylinder devices 1a to 1d according to the first to fourth embodiments, the pressure chamber 50 is provided between the front end plate 4 and the front annular disk 40 or between the front annular disk 40 and the front auxiliary annular disk 41. Therefore, when the pressure in the rod-side oil chamber 12 in the cylinder 3 reaches a predetermined value or more and the pressure in the pressure chamber 50 reaches a predetermined value or more, the front annular disk 40 or the front auxiliary annular disk 41 is provided. Is elastically deformed to open the pressure chamber 50, and the hydraulic oil in the pressure chamber 50 is relieved to the reservoir chamber 6. Thus, the front annular disc 40 and the front sub annular disc 41 are relief valves for relieving the hydraulic oil from the pressure chamber 50 to the reservoir chamber 6 when the pressure of the hydraulic oil in the rod side oil chamber 12 reaches a predetermined pressure. Can also be used.

Further, in the

cylinder devices

1c and 1e according to the third and fifth embodiments, a locking groove portion 78 as a movement restricting portion is formed on the front end outer peripheral surface of the front cylinder fitting portion 26 of the front end plate 4 and extending in an annular shape. On the other hand, a plurality of locking claws 79 as movement restricting portions are provided on the inner peripheral surfaces of the front annular disk 40 and the front auxiliary annular disk 41, respectively. When the front annular disc 40 and the front sub annular disc 41 are arranged around the front end of the front cylinder fitting portion 26 of the front end plate 4, the front annular disc 40 and the front annular disc 40 are inserted into the locking groove 78 provided in the front cylinder fitting portion 26. Since each latching claw part 79 of the front side secondary annular disk 41 is fitted, relative movement of the front side end plate 4, the front side annular disk 40 and the front side secondary annular disk 41 along the axial direction is restricted. . As a result, when the

cylinder devices

1c and 1e are assembled, the front end plate 4 is assembled in a state where the hydraulic oil is full in the outer cylinder 2. At this time, the front cylinder fitting portion 26 of the front end plate 4 is assembled. Since the front annular disk 40 and the front auxiliary annular disk 41 can be assembled in a state of being fitted to each other, workability is improved.

Note that the cylinder devices 1a to 1e according to the first to fifth embodiments described above are used between the carriage and the vehicle body of the railway vehicle and absorb the vibration caused by the rail installation state to suppress the meandering of the carriage. A so-called Yaw Damper, which is a type of shock absorber, has been described as an example. However, the present invention is not limited to this. In a railway vehicle, the present invention may be used between a carriage and a vehicle body, and may be used as a left-right motion damper that attenuates the relative lateral vibrations of the carriage and the vehicle body. It may be used in a vertical motion damper that is provided in parallel to the shaft spring and attenuates the vertical motion caused by the rail installation state, or a vehicle body that is provided on the vehicle body and suppresses relative motion between the vehicle bodies due to rail swell or wind. It may be used as an inter-damper.
Furthermore, the present invention may be applied to, for example, a hydraulic shock absorber for a vehicle (in this case, for example, a vertical shock absorber that absorbs vibrations in the upward and downward directions). It is also possible to apply to a shock absorber used for the above.

As a first aspect of the cylinder device, a cylinder, a piston that is slidably fitted in the cylinder, and an outer cylinder that is disposed on the outer peripheral side of the cylinder and forms a reservoir chamber with the cylinder And an end member that closes the end of the cylinder and the end of the outer cylinder, and an annular disk provided between the end member and the cylinder, the annular disk or the end A cylinder side opening that opens into the cylinder is provided between the member and the annular disk, and a reservoir chamber side opening that communicates with the cylinder side opening and opens into the reservoir chamber is provided in the annular disk. A rotation restricting portion for restricting relative rotation between the end member and the annular disk is formed.
As a second aspect of the cylinder device, in the first aspect, at least one of the cylinder side opening or the reservoir chamber side opening is formed around the rotation restricting portion.
According to a third aspect of the cylinder device, in the first or second aspect, a pressure chamber is formed between the end member and the annular disk, and the pressure chamber includes the cylinder side opening and the reservoir chamber. It communicates with the side opening.
As a fourth aspect of the cylinder device, in the third aspect, an annular sheet portion projecting annularly is provided on the cylinder side of the end member, and the annular disk is disposed so as to contact the annular sheet portion. Then, the pressure chamber is formed inside the annular sheet portion.
As a fifth aspect of the cylinder device, in the third aspect, an annular groove is formed in the end member, and the annular disk is disposed so as to cover the annular groove,
The pressure chamber is formed in the annular groove.
As a sixth aspect of the cylinder device, in any of the first to fifth aspects, a secondary annular disk is disposed between the annular disk and the cylinder.
As a seventh aspect of the cylinder device, in the sixth aspect, a groove portion as the cylinder side opening, a groove portion as the reservoir side opening, and a groove portion as the reservoir side opening, A communication groove serving as the pressure chamber is formed to communicate the cylinder side opening and the reservoir chamber side opening.
As an eighth aspect of the cylinder device, in any one of the first to seventh aspects, a movement restricting portion that restricts relative movement in the axial direction between the end member and the annular disk. Is provided.
According to a ninth aspect of the cylinder device, in the eighth aspect, the end member is provided with a locking groove portion as the movement restricting portion, and the locking groove portion communicates with the cylinder side opening and the reservoir chamber. It communicates with the side opening.

Although only a few embodiments of the present invention have been described above, various modifications or improvements can be made to the illustrated embodiments without substantially departing from the novel teachings and advantages of the present invention. Will be easily understood by those skilled in the art. Therefore, it is intended that the embodiment added with such changes or improvements is also included in the technical scope of the present invention. You may combine the said embodiment arbitrarily.

This application claims priority based on Japanese Patent Application No. 2015-152218 filed on July 31, 2015. The entire disclosure including the specification, claims, drawings, and abstract of Japanese Patent Application No. 2015-152218 filed on July 31, 2015 is incorporated herein by reference in its entirety.

1a, 1a ′, 1b, 1c, 1d, 1e cylinder device, 2 outer cylinder, 3 cylinder, 4 front end plate (end member), 5 rear end plate (end member), 6 reservoir chamber, 25 front outside Cylinder fitting part, 26 front cylinder fitting part, 27 concave rotation restricting part (rotation restricting part), 28 front annular seat part, 33 rear outer cylinder fitting part, 34 rear cylinder fitting part, 35 concave rotation restriction Part (rotation restricting part), 36 rear annular seat part, 40 front annular disk, 41 front sub annular disk, 43 convex rotation restricting part (rotation restricting part) 45, 62 cylinder side opening, 48, 64 reservoir chamber side opening , 50, 65 pressure chamber, 55 rear annular disk, 56 rear sub annular disk, 60 convex rotation restricting part (rotation restricting part), 72 cylinder communicating groove (groove part), 73 reservoir chamber communicating groove Part (groove part), 74 communicating groove part, 78 locking groove part (movement restricting part), 79 locking claw part (movement restricting part)

Claims

A cylinder device, the cylinder device comprising:
A cylinder,
A piston slidably fitted in the cylinder;
An outer cylinder disposed on the outer peripheral side of the cylinder and forming a reservoir chamber with the cylinder;
An end member for closing the end of the cylinder and the end of the outer cylinder;
An annular disc provided between the end member and the cylinder,
A cylinder side opening that opens into the cylinder is provided in the annular disk or between the end member and the annular disk,
The annular disk is provided with a reservoir chamber side opening that communicates with the cylinder side opening and opens into the reservoir chamber,
A cylinder device in which a rotation restricting portion for restricting relative rotation of each other is formed between the end member and the annular disk.
2. The cylinder device according to claim 1, wherein at least one of the cylinder side opening or the reservoir chamber side opening is formed around the rotation restricting portion.
Forming a pressure chamber between the end member and the annular disc;
The cylinder device according to claim 1, wherein the pressure chamber communicates with the cylinder side opening and the reservoir chamber side opening.
Providing an annular sheet portion projecting annularly on the cylinder side of the end member;
Arranged so that the annular disk contacts the annular sheet portion,
The cylinder device according to claim 3, wherein the pressure chamber is formed inside the annular seat portion.
Forming an annular groove in the end member;
The annular disk is arranged so as to cover the annular groove,
The cylinder device according to claim 3, wherein the pressure chamber is formed in the annular groove portion.
The cylinder device according to any one of claims 1 to 5, wherein a sub annular disk is disposed between the annular disk and the cylinder.
The pressure chamber in which a groove portion serving as the cylinder side opening, a groove portion serving as the reservoir side opening, and the cylinder side opening and the reservoir chamber side opening are communicated with a surface of the annular disk that contacts the sub annular disk. The cylinder device according to claim 6, wherein a communication groove portion is formed.
The cylinder device according to any one of claims 1 to 7, wherein a movement restricting portion that restricts relative movement in the axial direction is provided between the end member and the annular disk.
9. The cylinder according to claim 8, wherein a locking groove portion as the movement restricting portion is provided in the end member, and the locking groove portion communicates with the cylinder side opening and with the reservoir chamber side opening. apparatus.