JP6501887B2 - Cylinder device - Google Patents

Description

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

  The cylinder device as the damper has been proposed various structures to be able to cope with the required damping force characteristics and the target vehicle to be attached, but when the cylinder device is used in, for example, a railway vehicle, it is used in automobiles and Since there are few scenes where it strokes large compared with it, the air is difficult to be released, and a device for removing the air is required.

  For example, in Patent Document 1 as a prior art, both ends of the concentrically arranged outer cylinder and inner cylinder are closed by an end plate as a double cylinder type horizontal hydraulic shock absorber, and liquid and gas are sealed between the both. It is configured as an annular reservoir, and the gas accumulated in the corner of the liquid chamber in the inner cylinder, which is the upper side in the mounted state, is fitted around the fitting portion between at least one end of the inner cylinder and the end plate. In the double cylinder type horizontal hydraulic shock absorber in which the annular passage for releasing to the reservoir and the orifice for generating damping force are disposed, the annular passage is a fitting portion between the upper side portion of the end of the inner cylinder and the end plate. And the orifice communicates with the annular passage and the reservoir at a portion of the end plate which is always in the liquid state, and is in communication with the liquid chamber in the inner cylinder by a communication passage provided between it and the bottom of the concave portion. It is disclosed to be arranged.

JP, 2009-243634, A

  However, in the invention according to Patent Document 1, a recess bottom as a communication passage and an orifice are provided in the fitting portion of the end plate, and in order to require an axial length, the viewpoint of cost and weight Unfavorable.

  The object of the present invention is to provide a cylinder device capable of simplifying the air venting structure and improving the workability relating to assembly and processing while solving the problems such as the cost while maintaining the exhaustability of air. I assume.

A cylinder device according to an embodiment of the present invention includes a cylinder, a piston slidably fitted in the cylinder, and an outer peripheral side of the cylinder, and a reservoir chamber is formed between the cylinder and the cylinder. an outer cylinder, and the end member for closing the ends of the end and the outer cylinder of said cylinder, one or more annular disc Ru is sandwiched between the end portion member and the front end or the rear end of the cylinder A pressure chamber is formed between the end member and the disk on the end member side, and is opened in the cylinder, and a cylinder side opening communicating the inside of the cylinder with the pressure chamber A reservoir chamber side opening is provided, which is open in the reservoir chamber and communicates the reservoir chamber with the pressure chamber .

  In the cylinder device according to one embodiment of the present invention, the air venting structure can be simplified and the workability relating to assembly and processing can be improved, and the cost can be reduced while maintaining the air discharge property.

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 a 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, where (a) is a cross-sectional view taken along the line A-A of (b) and (b) is an arrow view seen from the cylinder side It is. FIG. 5 is a plan view of the front annular disc. FIG. 6 is a plan view of the front sub annular disc and the rear sub annular disc. 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 shows a rear end plate of the cylinder device according to the first embodiment, wherein (a) is a view as seen from the cylinder side, and (b) is a cross section taken along the line B-B of (a) FIG. FIG. 10 is a plan view of the rear annular disc. FIG. 11 is a cross-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 cylinder device. FIG. 12 is a cross-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 shows a front end plate of a cylinder device according to a second embodiment, wherein (a) is a cross-sectional view taken along the line C-C of (b), (b) is an arrow view seen from the cylinder side It is. FIG. 15 is a plan view of the front annular disc. 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. FIG. 18 shows the front end plate of the cylinder device according to the third embodiment, wherein (a) is a cross-sectional view taken along the line D-D in (b), (b) an arrow view seen from the cylinder side It is. FIG. 19 is a plan view of the front annular disc. FIG. 20 is a plan view of the front sub-annular disc. 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. Fig.22 (a) is the arrow line view which looked at the peripheral structure of the front side end plate of FIG. 21 from the cylinder side, (b) is an enlarged view of E part of (a). FIG. 23 shows a front end plate of a cylinder device according to a fourth embodiment, wherein (a) is a cross-sectional view taken along the line F-F of (b), (b) an arrow view seen from the cylinder side It is. FIG. 24 is a plan view of the front annular disc. FIG. 25 is a cross-sectional view of a peripheral structure of the front end plate in the cylinder device according to the fifth embodiment. Fig.26 (a) is the arrow line view which looked at the peripheral structure of the front side end plate of FIG. 25 from the cylinder side, (b) is an enlarged view of G part of (a). FIG. 27 shows the front end plate of the cylinder device according to the fifth embodiment, where (a) is a cross-sectional view taken along the line HH of (b), (b) an arrow view seen from the cylinder side It is. Fig.28 (a) is a top view of a front side annular disk, (b) is an enlarged view of I part. FIG. 29 (a) is a plan view of the front sub-annular disc, and FIG. 29 (b) is an enlarged view of a J portion.

Hereinafter, modes for carrying out the present invention will be described in detail based on FIGS. 1 to 29. FIG.
The cylinder devices 1a to 1e according to the first to fifth embodiments are adopted as a yaw damper for a railway vehicle mounted in a state of being placed horizontally between a bogie and a vehicle body. First, a cylinder device 1 a according to a first embodiment will be described based on FIGS. 1 to 10.
As shown in FIG. 1, the cylinder device 1 a according to the first embodiment is a bi-flow type, and an outer cylinder 2 extending in the horizontal direction when attached to a railway vehicle; And a cylinder 3 arranged concentrically. Both end openings of the outer cylinder 2 and the cylinder 3 are closed by the front end plate 4 and the 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. In the reservoir chamber 6, hydraulic oil and gas are enclosed. In the following, for convenience of explanation, the left side in the drawing (when the code is erected), that is, the bracket 19 side is the front side, and the right side in the drawing, the bracket 20 side is 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 of the piston rod 11. A support hole 24 is formed to movably support the piston rod 11 in the axial direction. The front end plate 4 is integrally provided on the cylinder 3 side with the disk-shaped front outer cylinder fitting portion 25 fitted in the outer cylinder 2 and the front outer cylinder fitting portion 25. It is comprised from the disk-shaped front side cylinder fitting part 26 fitted inside. On the outer peripheral surface of the front cylinder fitting portion 26, the concave rotation restricting portion 27 is formed along the axial direction at a portion located at the uppermost end in a state where 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 seat portion 28 projecting toward the cylinder 3 is formed on the surface of the front outer cylinder fitting portion 25 facing the reservoir chamber 6. In the present embodiment, the cross-sectional shape of the annular sheet portion 28 is provided so as to protrude with a predetermined width and the end face is formed in a semicircular shape, but is not limited to the shape.

  As shown in FIGS. 1 and 7 to 9, the rear end plate 5 has a first rear end plate 31 for closing the rear end opening of the outer cylinder 2 and a second end plate for closing the rear end opening of the cylinder 3. It has a divided structure including the rear end plate 32. 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 projects toward the cylinder 3 integrally with the disk-shaped rear outer cylinder fitting portion 33 fitted in the outer cylinder 2 and the rear outer cylinder fitting portion 33. A disc-shaped rear cylinder fitting portion 34 is provided and fitted in the cylinder 3. The rear outer cylinder 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 side cylinder fitting portion 34, the concave rotation restricting portion 35 is formed along the axial direction at a portion located at the uppermost end in a state where the cylinder device 1a is attached to the railway vehicle.

  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 a surface of the rear side outer cylinder fitting portion 33 of the second rear side end plate 32 facing the reservoir chamber 6, an annular seat portion 36 projecting toward the cylinder 3 side is formed. In the present embodiment, the cross-sectional shape of the annular sheet portion 36 is also provided with a predetermined width and the end face is formed in a semicircular shape, but the shape 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 the piston 10 into a rod side oil chamber 12 and an opposite rod side oil chamber 13. A hydraulic fluid (working fluid) is sealed in each of the rod side oil chamber 12 and the non-rod side oil chamber 13. The piston 10 is opened according to the pressure in the rod side oil chamber 12, and a pressure control valve 15 which causes the hydraulic oil in the rod side oil chamber 12 to flow to the opposite rod side oil chamber 13, and the opposite rod side oil A pressure regulating valve 16 is disposed, which opens according to the pressure in the chamber 13 and causes the hydraulic oil in the opposite rod side oil chamber 13 to flow to the rod side oil chamber 12. 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 fluid-tight manner to the outside of the outer cylinder 2. At the other end of the piston rod 11, a connection bracket 19 connected to the carriage side is fixed.

  The second rear end plate 32 of the rear end plate 5 is opened in response to the pressure in the anti rod-side oil chamber 13 to release the hydraulic oil in the anti rod-side oil chamber 13 to the reservoir chamber 6. A valve 17 and a check valve 18 that allows only the flow of hydraulic fluid from the reservoir chamber 6 to the non-rod side oil chamber 13 are provided.

  As shown in FIGS. 1 and 2, between the front outer cylinder fitting portion 25 of the front end plate 4 and the front end of the cylinder 3, the front annular disc 40 and the front sub annular disc 41 (from the front end plate 4 side) 5 and 6) are also arranged in this order. The front annular disc 40 and the front sub annular disc 41 have the same outer diameter. The outer diameters of the front annular disc 40 and the front sub-annular disc 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 sub annular disc 41 substantially match the outer diameter of the front cylinder fitting portion 26 of the front end plate 4. In the present embodiment, although the thickness of the front annular disc 40 and the thickness of the front sub annular disc 41 are substantially the same, the thickness of the front sub annular disc 41 is made thicker than the thickness of the front annular disc 40 The thickness of the disc 40 and the thickness of the front sub-annular disc 41 may be different.

  As shown in FIGS. 2, 3 and 5, on the inner peripheral surface of the front annular disc 40, a convex rotation restricting portion 43 which protrudes inward is provided in a protruding manner. The convex rotation restricting portion 43 has a substantially semicircular shape, and is fitted to the 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 disc 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. Thus, the convex rotation restricting portion 43 is fitted in the concave rotation restricting portion 27 provided on the outer peripheral surface of the front cylinder fitting portion 26 without a gap. The convex rotation restricting portion 43 of the front annular disc 40 is formed with an elongated hole 44 having a predetermined width that penetrates in the axial direction. The elongated 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 matches 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 43 of the long hole 44 is the cylinder side opening 45. A notch may be provided on the outer peripheral surface of the convex rotation restricting portion 43, and the notch may be used as the cylinder side opening 45. At the lower part of the outer circumferential surface of the front annular disc 40, the communication projection 46 is formed at a position different from the convex rotation restricting part 43 in the counterclockwise direction by 150 ° in FIG. The communication projection 46 may be formed at the lowermost portion which is different from the convex rotation restricting portion 43 by 180 °. The communicating projection 46 is formed with an elongated hole 47 (orifice) having a predetermined width that penetrates in the axial direction. The elongated hole 47 extends radially inward from the communication protrusion 46. The range of the communication protrusion 46 of the long hole 47 is the reservoir chamber side opening 48.

  Then, as shown in FIG. 2, the front annular disc 40 and the front sub annular disc 41 are disposed 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. The convex rotation restricting portion 43 provided on the front annular disc 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 disc 40 is restricted. Further, the long hole 44 formed in the range of the convex rotation restricting portion 43 provided on the front annular disc 40, that is, the 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. The cylinder-side opening 45 communicates with the rod-side oil chamber 12 in the cylinder 3. Further, a pressure chamber 50 extending annularly is formed between the front outer cylinder fitting portion 25 and the front annular disc 40 inside the annular seat portion 28. The pressure chamber 50 communicates with the long hole 44 on the side of the convex rotation restricting portion 43 provided in the front annular disc 40 and also communicates with the long hole 47 on the side of the communication projection 46 provided on the front annular disc 40. A long hole 47 formed in the range of the communication protrusion 46 provided on the front annular disk 40, that is, a reservoir chamber side opening 48 opens to the reservoir chamber 6.

  Thus, the rod side oil chamber 12 in the cylinder 3 has an annular shape between the front outer cylinder fitting portion 25 and the front annular disc 40, the cylinder side opening 45 provided in the convex rotation restricting portion 43 of the front annular disc 40. It communicates with the reservoir chamber 6 through the reservoir chamber side opening 48 provided in the communication chamber 46 of the front annular disc 40 and the pressure chamber 50 extending to the In the present embodiment, the communication projection 46 is provided on the outer peripheral surface of the front annular disc 40, and the communication projection 46 is provided with the long hole 47 as an orifice. The protrusion 46 may not be provided, and a notch communicating with the pressure chamber 50 may be provided on the outer peripheral surface thereof, and the radial opening (orifice) of the notch may be the reservoir chamber side opening 48.

  As shown in FIGS. 7 and 8, the rear end plate is provided 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 disc 55 and a plurality of rear secondary annular discs 56, 56 (two rear secondary annular discs in this embodiment) (see also FIGS. 6 and 10) are disposed from the 5 side. The outer annular disc 55 and the rear auxiliary annular disc 56 have the same outer diameter. The outer diameters of the rear annular disc 55 and the rear auxiliary 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 disc 55 and the respective rear sub annular discs 56 substantially match 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 is substantially the same as the thickness of the rear secondary annular disk 56, but the thickness of the rear secondary annular disk 565 is made thicker than the thickness of the rear annular disk 55. Alternatively, the thickness of the rear annular disc 55 may be different from the thickness of the rear secondary annular disc 56.

  As shown in FIG. 7, FIG. 8 and FIG. 10, on the inner peripheral surface of the rear side annular disc 55, a convex rotation restricting portion 60 protruding inward is provided in a protruding manner. The convex rotation restricting portion 60 is protruded in a substantially semicircular shape, and is fitted to the 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 side annular disc 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. As a result, the convex rotation restricting portion 60 is fitted in the concave rotation restricting portion 35 provided on the outer peripheral surface of the rear cylinder fitting portion 34 without a gap. The convex rotation restricting portion 60 of the rear annular disc 55 is formed with an elongated hole 61 penetrating in the axial direction and extending 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 matches 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 is the cylinder side opening 62. A notch may be provided on the outer peripheral surface of the convex rotation restricting portion 60, and the notch may be used as the cylinder side opening 62. On the outer peripheral surface of the rear annular disc 55, a notch 63 is formed at the lowermost portion different from the convex rotation restricting portion 43 by 180 °. A portion (orifice) opening in the radial direction of the notch 63 is the reservoir chamber side opening 64.

  Then, as shown in FIG. 7, a rear annular disc 55 and two sheets are provided between the annular seat 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. Of the rear side sub annular disk 56, 56, the concave rotation restricting portion 35 provided on the outer peripheral surface of the rear cylinder fitting portion 34 and the convex rotation restricting portion 60 provided on the rear side annular disk 55 without a gap To fit. As a result, relative rotation between the rear end plate 5 and the rear annular disc 55 is restricted. Further, the long hole 61 formed in the range of the convex rotation restricting portion 60 provided on the rear side annular disc 55, that is, the cylinder side opening 62 is the outer peripheral surface of the rear cylinder fitting portion 34 in the opposite rod side oil chamber 13. The cylinder-side opening 62 communicates with the opposite rod-side oil chamber 13 in the cylinder 3.

  Further, a pressure chamber 65 extending annularly is formed between the rear outer cylinder fitting portion 33 and the rear annular disc 55 inside the annular seat portion 36. The pressure chamber 65 communicates with an elongated hole 61 provided in the rear annular disc 55 and also communicates with a notch 63 provided in the rear annular disc 55. A reservoir chamber side opening 64 opening in a radial direction of a 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 provided between the cylinder side opening 62 provided in the convex rotation restricting portion 60 of the rear side annular disc 55, the rear side outer cylinder fitting portion 33 and the rear side annular disc 55 It communicates with the reservoir chamber 6 via the reservoir chamber side opening 64 of the pressure chamber 65 and the notch 63 provided on the outer peripheral surface of the rear annular disk 55, which extends in an annular shape.

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 attached in a state of being placed horizontally between the bogie and the vehicle body, the bracket 19 on the piston rod 11 side is connected to the bogie, and the bracket 20 on the outer cylinder 2 side is connected to the vehicle body Be 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. Then, during the extension stroke of the piston rod 11, the hydraulic oil in the rod side oil chamber 12 is opened by the pressure adjusting valve 15 provided on the piston 10 according to the pressure in the rod side oil chamber 12 and passes through the pressure adjusting valve 15. Then, the fluid flows to the opposite rod side oil chamber 13, and in response, an extension side damping force is generated. During this extension stroke, the hydraulic oil for the displacement of the piston rod 11 passes through the check valve 18 provided on the second rear end plate 32 of the rear end plate 5 from the reservoir chamber 6 to the non-rod side oil chamber 13 Be supplied to

  At this time, the air accumulated in the corner of the front end in the concave rotation regulating portion 27 of the front cylinder fitting portion 26 of the front end plate 4 is combined with the hydraulic oil in the rod side oil chamber 12 and in the rod side oil chamber 12 → front side Cylinder side opening 45 provided in the convex rotation restricting portion 43 of the annular disc 40 → pressure chamber 50 extending annularly between the front outer cylinder fitting portion 25 and the front annular disc 40 → communication projection 46 of the front annular disc 40 It is discharged to the reservoir chamber side opening 48 provided in (the long hole 47 which is an orifice) → the reservoir chamber 6. In addition, when the hydraulic fluid flows through this path, in particular, when it flows through the orifice 47, a damping force is generated.

  Further, the pressure in the rod oil side chamber 12 in the cylinder 3 reaches a predetermined value or more, and the pressure in the pressure chamber 50 extending annularly between the front outer cylinder fitting portion 25 and the front annular disc 40 is a predetermined value or more The front annular disc 40 and the front sub annular disc 41 are elastically deformed so as to be separated from the annular seat portion 28 so that the hydraulic oil in the rod side oil chamber 12 is relieved from the pressure chamber 50 to the reservoir chamber 6. become. Thus, the front annular disc 40 and the front sub annular disc 41 are reliefs that relieve the hydraulic fluid from the pressure chamber 50 to the reservoir chamber 6 when the pressure of the hydraulic fluid in the rod side oil chamber 12 reaches a predetermined pressure. It also acts as a valve.

  On the other hand, at the time of the compression stroke of the piston rod 11, the hydraulic oil in the opposite rod side oil chamber 13 is opened by the pressure adjustment valve 16 provided on the piston 10 according to the pressure in the opposite rod side oil chamber 13. Flow to the rod side oil chamber 12 and a damping force on the compression side is generated accordingly. During the compression stroke, the hydraulic oil for the approach of the piston rod 26 flows from the opposite rod side oil chamber 13 into the reservoir chamber 6 through the relief valve 17 provided on the second rear member of the rear end plate 5. Also in this case, a damping force is generated.

  At this time, the air accumulated at the rear end corner 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, Inside the chamber 13 → cylinder side opening 62 provided in the convex rotation restricting portion 60 of the rear annular disc 55 → pressure chamber 65 which extends annularly between the rear outer cylinder fitting portion 33 and the rear annular disc 55 → rear The fluid is discharged from the reservoir chamber side opening (orifice) 64 provided in the side annular disc 55 to the reservoir chamber 6. In addition, when the hydraulic fluid flows through this path, particularly when it flows through the orifice 64 which is the reservoir chamber side opening, a damping force is generated.

  Further, the pressure in the non-rod side oil chamber 13 in the cylinder 3 reaches a predetermined value or more, and the pressure in the pressure chamber 65 extending annularly between the rear outer cylinder fitting portion 33 and the rear annular disc 55 When the pressure reaches a predetermined value or more, the rear annular disc 55 and the rear auxiliary annular discs 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 becomes a pressure chamber. As a result, the reservoir chamber 6 is relieved. As described above, when the pressure of the hydraulic oil in the opposite rod side oil chamber 13 reaches a predetermined pressure, the front annular disc 40 and the rear sub annular discs 56, 56 receive the hydraulic oil from the pressure chamber 65 to the reservoir chamber 6. Also acts as a relief valve to relieve pressure.

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 a uniflow 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 fluid from the non-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 fluid from the reservoir chamber 6 to the non-rod side oil chamber 13. In the front end plate 4, a pressure regulating valve 69 is disposed, which opens according to the pressure in the rod side oil chamber 12 and causes the hydraulic oil in the rod side oil chamber 12 to flow 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 by the pressure adjusting valve 69 provided on the front end plate 4 according to the pressure in the rod side oil chamber 12 to the reservoir chamber 6. It flows and a damping force on the expansion side is generated accordingly. During this extension stroke, the hydraulic oil for the displacement of the piston rod 11 passes through the check valve 68 provided on the second rear end plate 32 of the rear end plate 5 from the reservoir chamber 6 to the non-rod side oil chamber 13 Be supplied to On the other hand, during the compression stroke of the piston rod 11, the hydraulic oil in the non-rod side oil chamber 13 flows through the check valve 67 provided on the piston 10 to the rod side oil chamber 12, and the inside of the anti rod side oil chamber 13 and the rod The pressure in the side oil chamber 12 is the same, and the working oil of the approach of the piston rod 26 flows into the reservoir chamber 6 through the pressure control valve 69 provided on the front end plate 4 and the damping on the contraction side accordingly Force is generated.

  As described above, 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 compression stroke. Inside the 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 fluid is discharged from the reservoir chamber side opening 48 (a long hole 47 which is an orifice) provided in the communication projection 46 of the disk 40 to the reservoir chamber 6. In addition, when the hydraulic fluid flows through this path, in particular, when it flows through the orifice 47, a damping force is generated.

Next, a cylinder device 1b according to a second embodiment will be described based on FIG. 12 to FIG. 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 on the front outer cylinder fitting portion 25 of the cylinder device 1a according to the first embodiment 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 radially outward from the convex rotation restricting portion 43 is formed on the surface of the front annular disk 40 on the cylinder 3 side. The cylinder communication groove 72 is formed such that the opening width thereof gradually increases in the radial direction. The range formed on the convex rotation restricting portion 43 of the cylinder communication groove portion 72 is the cylinder side opening 45. A reservoir chamber communicating groove 73 extending radially inward from the communicating protrusion 46 is formed on the surface of the front annular disc 40 on the cylinder 3 side. The reservoir chamber communication groove 73 has the same opening width and is formed smaller than the minimum opening width of the cylinder communication groove 72. The reservoir chamber side communication groove 73 acts as an orifice. The range formed on the communication projection 46 of the reservoir chamber communication groove 73 is the reservoir chamber side opening 48. The annular surface on the cylinder 3 side of the front annular disc 40 is circumferentially connected so that the radial outer end of the cylinder communication groove 72 and the radial inner end of the reservoir chamber communication groove 73 communicate with each other. A communication groove 74 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 made different.

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

  Further, the communication groove 74 provided on the front annular disc 40 functions as the pressure chamber 50. Further, a reservoir chamber communicating groove 73 formed in the range of the communicating protrusion 46 of the front annular disk 40, that is, the reservoir chamber side opening 48 is opened to the reservoir chamber 6. Thereby, the rod side oil chamber 12 in the cylinder 3 is provided in the cylinder side opening 45 (the cylinder communication groove 72) provided in the convex rotation restricting portion 43 of the front side annular disc 40 and in the circumferential direction provided in the front side annular disc 40 It communicates with the reservoir chamber 6 through 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 projection 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 of the front end in the concave rotation regulating portion 27 of the front cylinder fitting portion 26 of the front end plate 4 is a rod together with the hydraulic oil in the rod side oil chamber 12 Inside the oil chamber 12 → cylinder side opening 45 provided in the convex rotation restricting portion 43 of the front annular disc 40 → cylinder communication groove 72 of the front annular disc 40 → pressure as communication groove 74 provided in the front annular disc 40 Chamber 50 → reservoir chamber communication groove 73 as an orifice provided in the front annular disk 40 → reservoir chamber side opening 48 provided in the communication projection 46 of the front annular disk 40 → the reservoir chamber 6 In addition, when the hydraulic fluid flows through this path, particularly when flowing through the reservoir chamber communicating groove 73 as an orifice, a damping force is generated.

  When the pressure in the pressure chamber 50 as the communication groove 74 provided on the front annular disc 40 reaches a predetermined value or more, the outer peripheral portion of the front sub-annular disc 41 is elastically deformed so as to be separated from the front annular disc 40. Thus, the hydraulic oil in the rod side oil chamber 12 is relieved from the pressure chamber 50 to the reservoir chamber 6. As described above, when the pressure of the hydraulic fluid in the rod side oil chamber 12 reaches a predetermined pressure, the front sub annular disc 41 acts as a relief valve that relieves the hydraulic fluid from the pressure chamber 50 to the reservoir chamber 6.

Next, a cylinder device 1c according to a third embodiment will be described based on FIG. 16 to FIG. 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, the reservoir chamber communication groove 73 extending radially inward from the communication protrusion 46 is formed. However, the reservoir chamber communication groove 73 and the cylinder communication groove 72 are formed. Similarly, the opening width is formed so as to gradually increase radially outward. A communication groove 74 communicating the radially outer end of the cylinder communication groove 72 with the radially inner end of the reservoir chamber communication groove 73, which is adjacent to the cylinder communication groove 72. An orifice 75 with a reduced opening width is formed.

Further, in the cylinder device 1c according to the third embodiment, a locking groove 78 as a movement restricting portion is formed annularly on the front end outer peripheral surface 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 78 substantially matches the dimension of the thickness of the front annular disc 40 and the thickness of the front sub annular disc 41. The locking groove 78 is formed in a U-shape. The locking groove 78 may be formed in a U-shape, a triangle or the like.
A plurality of locking claws 79 as a movement restricting portion are formed on the inner peripheral surface of the front annular disc 40. The plurality of 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 disc 40. The plan view shape of each locking claw 79 is formed in a triangular shape. The planar shape of each locking claw 79 may be rectangular or semicircular. In this embodiment, four points are formed at equal intervals. Further, a plurality of locking claws 79 are also formed on the inner peripheral surface of the front sub annular disc 41. The plurality of 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 sub-annular disc 41. The plan view shape of each locking claw 79 is formed in a triangular shape. The planar shape of each locking claw 79 may be rectangular or semicircular. In this embodiment, four points are formed at equal intervals. The amount of protrusion of the locking claws 79 of the front annular disc 40 and the front sub-annular disc 41 is substantially the same as the depth of the locking groove 78 provided in the front cylinder fitting portion 26.

  The front annular disc 40 and the front sub-annular disc 41 are disposed around the front end of the front cylinder fitting portion 26 of the front end plate 4, and the front annular disc 40 is engaged with the locking groove 78 provided in the front cylinder fitting portion 26. And the engagement claws 79 of the front sub annular disk 41 are respectively fitted. Thus, relative movement along the axial direction of each of the front end plate 4 and the front annular disc 40 and the front sub annular disc 41 is restricted. Thus, when assembling the cylinder device 1c, the front end plate 4 is installed with the hydraulic oil in the outer cylinder 2 full, but at this time, the front cylinder fitting portion 26 of the front end plate 4 is fronted. Since the annular disc 40 and the front sub annular disc 41 can be assembled in a fitted state, the 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 of the front end in the concave rotation regulating portion 27 of the front cylinder fitting portion 26 of the front end plate 4 is a rod together with the hydraulic oil in the rod side oil chamber 12 Inside 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 72 provided in the front annular disc 40 → provided in the communication groove 74 of the front annular disc 40 Orifice 75 → communication groove 74 as pressure chamber 50 → reservoir chamber communication groove 73 provided on the front annular disc 40 → reservoir chamber side opening 48 provided on the communication projection 46 of the front annular disc 40 → reservoir chamber 6 Exhausted. In addition, a damping force is generated when the hydraulic fluid flows through this path, particularly when it flows through the orifice 75 provided in the communication groove 74 of the front annular disc 40.

Next, a cylinder device 1d according to a fourth embodiment will be described based on FIG. 21 to FIG. 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 front side outer cylinder fitting portion 25 of the front side end plate 4 has a predetermined width on the cylinder 3 side surface (surface on which the front annular disc 40 contacts) and extends annularly A first communication groove 81 is formed. The first communication groove 81 is disposed at the position of the reservoir chamber 6 in the radial direction. On the cylinder 3 side surface of the front outer cylinder fitting portion 25, a second communication groove portion 82 linearly extending in the 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 It is formed. The second communication groove 82 communicates with the first communication groove 81. The first and second communication grooves 81 and 82 are formed in a U-shape. The first communication groove 81 is formed deeper than the depth of 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 grooves 81 and 82 may be formed in a U shape, a triangle shape or the like. The second communication groove 82 acts as a pressure chamber 50. The first communication groove 81 is in communication with the second communication groove 82 (the concave rotation restricting portion 27) in FIG. 22, and only 150 ° in the counterclockwise direction from the second communication groove 82. It may be made to communicate with the notch part 85 provided in the outer peripheral surface of the front side annular disk 40 mentioned later.

  A convex rotation restricting portion 43 is formed on the inner peripheral surface of the front annular disc 40, and the amount of protrusion 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 regulation portion 27. Thus, when the convex rotation restricting portion 43 provided on the front annular disc 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 gap 83 is formed between the rotation restricting portion 27 and the bottom of the rotation restricting portion 27, and the gap 83 serves as the cylinder side opening 45. On the other hand, a notch 85 as an orifice is formed on the outer circumferential surface of the front annular disc 40 at a position which is different from the convex rotation restricting portion 43 in the counterclockwise direction by 150 ° 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. The portion of the notch 85 which opens in the radial direction is the reservoir chamber side opening 48.

  The front annular disc 40 and the front sub annular disc 41 are disposed between the front outer cylinder fitting portion 25 of the front end plate 4 and the front end of the cylinder 3 and provided on the outer peripheral surface of the front cylinder fitting portion 26 The convex rotation restricting portion 43 provided on the front annular disc 40 is fitted to the concave rotation restricting portion 27. As a result, relative rotation between the front end plate 4 and the front annular disc 40 is restricted. Further, the rod side oil chamber 12 in the cylinder 3 has a gap 83 provided between the tip of the convex rotation restricting portion 43 of the front annular disc 40 and the bottom of the concave rotation restricting portion 27 of the front cylinder fitting portion 26. The pressure chamber 50 and the front annular disc 40 as the first communication groove 81 provided in the cylinder side opening 45, the second communication groove 82 provided in the front outer cylinder fitting portion 25, and the first communication groove 81 provided in the front outer cylinder fitting 25 The reservoir chamber 6 communicates with the reservoir chamber 6 through a reservoir chamber side opening 48 which 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 of the front end in the concave rotation regulating portion 27 of the front cylinder fitting portion 26 of the front end plate 4 is a rod together with the hydraulic oil in the rod side oil chamber 12 Inside the side oil chamber 12 → cylinder side opening 45 → front side which is a gap 83 provided between the tip of the convex rotation restricting portion 43 of the front annular disc 40 and the bottom of the concave rotation restricting portion 27 of the front cylinder fitting portion 26 Second communication groove 82 provided in the outer cylinder fitting 25 → pressure chamber 50 as the first communication groove 81 provided in the front outer cylinder fitting 25 → notch as the orifice provided in the front annular disk 40 The fluid is discharged to the reservoir chamber side opening 48 → the reservoir chamber 6 which opens in the radial direction of the portion 85. In addition, a damping force is generated when the hydraulic fluid flows through this path, particularly when it flows through the notch 85 as an orifice provided in the front annular disc 40.

  Further, when the pressure in the pressure chamber 50 as the first communication groove portion 81 provided in the front annular disc 40 reaches a predetermined value or more, the outer peripheral portions of the front annular disc 40 and the front sub annular disc 41 engage the front outer cylinder The hydraulic fluid in the rod-side oil chamber 12 is relieved from the pressure chamber 50 to the reservoir chamber 6 by being elastically deformed so as to be separated from the surface on the cylinder 3 side of the portion 25. As described above, the front annular disc 40 and the front sub annular disc 41 are reliefs that relieve the hydraulic fluid from the pressure chamber 50 to the reservoir chamber 6 when the pressure of the hydraulic fluid in the rod side oil chamber 12 reaches a predetermined pressure. Act as a valve.

Next, a cylinder device 1e according to a fifth embodiment will be described based on FIG. 25 to FIG. 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 linearly extends in the radial direction and the bottom portion is formed in a substantially semicircular shape. Be done. The opening width of the concave rotation restricting portion 27 is set to the diameter of the semicircular portion 100 provided at the tip of the convex rotation restricting portion 43 described later, and the semicircular bottom portion is a semicircular portion of the convex rotation restricting portion 43 Match the ring-like part 100. A locking groove 78 extending annularly is formed on the front end outer peripheral surface 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 78 corresponds to the sum of the thickness of the front annular disc 40 and the thickness of the front sub annular disc 41. The locking groove 78 is formed in a U-shape. The locking groove 78 may be formed in a U-shape, a triangle or the like. As will be described in detail later, at the bottom of the locking groove 78, in the range facing the inner circumferential surface of the front annular disc 40, and in FIG. 26, the range of 150 ° in the counterclockwise direction from the concave rotation restricting portion 27. May act as a communication groove 90 for communicating the cylinder side opening 45 and the reservoir chamber side opening 48. In the range of the locking groove 78 other than that, each locking claw 79 of the front side annular disk 40 and each locking claw 79 of the front side sub annular disk 41 which will be described later are fitted.

  The convex rotation restricting portion 43 provided on the inner circumferential surface of the front annular disc 40 is integrally connected to the linear range of the semicircular portion 100 at the tip and the semicircular portion 100. And a linear portion 101 having a width smaller than the diameter of and extending in the radial direction. The linear portion 101 is formed near one end of the semicircular portion 100 in the radial direction. The radial length of the linear portion 101 is substantially the same as the depth of the locking groove 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, at the lower part of the outer peripheral surface of the front annular disc 40, the communication projection 46 is formed at a position different from the convex rotation restricting part 43 in FIG. 28 by 150 ° in the counterclockwise direction. A radially outwardly extending notch 102 is formed on the inner circumferential surface of the front annular disc 40, and the notch 102 is formed from the inner circumferential surface of the front annular disc 40 to the communication projection 46 Be done. In the notch portion 102, an orifice 110 having a narrow opening width is formed in a range on the communication projection 46 side bordering a substantially intermediate position in the radial direction. The area of the communication protrusion 46 in the notch 102, that is, the orifice 110 is the reservoir chamber side opening 48.

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

The semicircular portion 100 and the linear portion 105 have the same shape as the convex rotation restricting portion 43 at a position corresponding to the convex rotation restricting portion 43 of the front annular disk 40 on the inner peripheral surface of the front sub annular disk 41. And a protrusion 105 of 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 79 is substantially the same as the thickness of the front sub-annular disc 41. In the present embodiment, four locking claws 79 are formed.
The amount of protrusion of the locking claws 79 of the front annular disc 40 and the front sub-annular disc 41 is smaller than the depth of the locking groove 78 provided in the front cylinder fitting portion 26. The protruding amount of each of the locking claws 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, although the protrusion 105 is provided also on the front sub annular disk 41, the protrusion 105 is not necessarily required.

When the front annular disc 40 and the front sub annular disc 41 are disposed between the front outer cylinder fitting portion 25 of the front end plate 4 and the front end of the cylinder 3, the locking groove portion 78 provided in the front cylinder fitting portion 26 The respective locking claws 79 of the front annular disc 40 and the respective locking claws 79 of the front sub-annular disc 41 fit in the range other than the communication groove 90 formed in the above-described predetermined range. Thereby, the relative movement of the front end plate 4 and the front annular disc 40 and the front sub annular disc 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 disc 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 of 102, and the space 106 becomes a 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 78 communicates with the notch 102 of the front annular disc 40. The range formed on the communication projection 46 of the notch 102 is the reservoir chamber side opening 48, and communicates with the reservoir chamber 6.
In the embodiment in which the protruding amounts of the locking claws 79 of the front annular disc 40 and the front sub annular disc 41 and the depths of the locking grooves 78 provided in the front cylinder fitting portion 26 are substantially the same. In the locking groove 78, the bottom of the locking groove 78 faces the inner peripheral surface of the front annular disc 40, and in FIG. 26, the range of 150 ° in the counterclockwise direction from the concave rotation restricting portion 27 It functions as a communication groove portion 90 for communicating the reservoir chamber side opening 48 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 of the front end in the concave rotation regulating portion 27 of the front cylinder fitting portion 26 of the front end plate 4 is a rod together with the hydraulic oil in the rod side oil chamber 12 Inside the side oil chamber 12 → cylinder side opening 45 which is the 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 disc 40 → to the front cylinder fitting portion 26 Retaining groove 78 → notch 102 in front annular disk 40 → orifice 110 in notch 102 → reservoir chamber side opening 48 which is a range formed in communication projection 46 of orifice 110 → reservoir chamber It is discharged into six. In the present embodiment, the amount of protrusion of the locking claws 79 of the front annular disc 40 and the front sub-annular disc is formed smaller than the depth of the locking groove 78 provided in the front cylinder fitting portion 26. As a result, 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.

In the embodiment in which the amount of protrusion of the locking claws 79 of the front annular disc 40 and the front sub-annular disc is the same as the depth of the locking groove 78 provided in the front cylinder fitting portion 26, the hydraulic oil is It flows from the cylinder side opening 45 into the locking groove 78 provided in the front cylinder fitting portion 26, flows through the communication groove 90 which is the predetermined range of the locking groove 78, and the orifice of the notch 102 The fluid flows into the reservoir chamber 6 through the opening 110 and the reservoir chamber side opening 48. Furthermore, a damping force is generated when the hydraulic fluid flows through this path, particularly when it flows through the orifice 110 of the notch 102 provided in the front annular disc 40.
In the cylinder device 1e according to the fifth embodiment, the portions corresponding to the pressure chambers 50 and 65 provided in the cylinder devices 1a to 1d according to the first to fourth embodiments are not provided, and the front annular disc 40 and the front sub annular disc 41 do not function as a relief valve.

  Furthermore, when the front annular disc 40 and the front sub annular disc 41 are disposed around the front end of the front cylinder fitting portion 26 of the front end plate 4, the front annular disc 40 and the locking groove 78 provided in the front cylinder fitting portion 26 The locking claws 79 of the front sub annular disk 41 are respectively fitted. Thus, relative movement along the axial direction of each of the front end plate 4 and the front annular disc 40 and the front sub annular disc 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 is not provided, and the notch 102 is formed in the orifice 110 which narrows the entire area in the radial direction so that the radial outer end of the notch 102 (orifice 110) faces the reservoir chamber 6. For example, it is not necessary to provide the front sub-annular disc 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 Between the end plate 4 and the front annular disk 40, there is provided a cylinder side opening 45 opening into the cylinder 3, and in the front annular disk 40, a reservoir chamber communicating with the cylinder side opening 45 and opening into the reservoir chamber 6. Side openings 48 are provided, and between the front end plate 4 and the front annular disc 40, rotation restricting portions 27, 43 are formed which restrict relative rotation between each other. Thereby, the rotational directions of the front end plate 4 and the front annular disc 40 can be positioned relative to each other, and the cylinder side opening 45 can be positioned at the uppermost end in the attached state of the cylinder devices 1a to 1e to the target vehicle. It can be arranged.

  Therefore, in the invention according to the conventional patent document 1, machining to provide an orifice in the fitting portion of the end plate is complicated, which is not preferable from the viewpoint of cost, and further, liquid between the fitting portion of the end plate and the cylinder Although O-rings are used to provide a tight seal, the resiliency of the O-rings may cause a delay in the response especially under high pressure. Furthermore, the work of incorporating the O-rings is time-consuming and needs improvement There was a problem called. As a result of the construction of the present invention, the air accumulated at the corner between the front end plate 4 and the front end of the cylinder 3 along with the hydraulic oil in the rod side oil chamber 12 during the extension stroke of the piston rod 11, in particular From the inside of the side oil chamber 12, it is discharged to the reservoir chamber 6 through the cylinder side opening 45 and the reservoir chamber side opening 48, and the air discharging property can be maintained. Moreover, as the air venting structure, the cylinder side opening 45 is provided between the front annular disc 40 or the front end plate 4 and the front annular disc 40, and the reservoir room side opening 48 is provided in the front annular disc 40. There is no need to provide an O-ring as in the prior art, and the processing on the front end plate 4 can be minimized, the workability can be improved, and the cost can be reduced.

  In the cylinder devices 1a to 1d according to the first to fourth embodiments, the pressure chamber 50 is formed between the front end plate 4 and the front annular disc 40 or between the front annular disc 40 and the front sub annular disc 41. Since 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 disc 40 and the front sub-annular disc 41 are provided. As a result of the elastic deformation of the pressure chamber 50, the hydraulic fluid in the pressure chamber 50 is relieved to the reservoir chamber 6. As a result, when the pressure of the hydraulic fluid in the rod side oil chamber 12 reaches a predetermined pressure, the front annular disc 40 and the front sub annular disc 41 are relief valves that relieve the hydraulic fluid from the pressure chamber 50 to the reservoir chamber 6 It can also act as

  Furthermore, in the cylinder devices 1c and 1e according to the third and fifth embodiments, the locking groove 78 as a movement restricting portion is formed annularly on the front end outer peripheral surface of the front cylinder fitting portion 26 of the front end plate 4. On the other hand, on the inner circumferential surfaces of the front annular disc 40 and the front sub annular disc 41, a plurality of locking claws 79 as movement restricting portions are provided. 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 locking groove 78 provided in the front cylinder fitting portion 26 Since the respective locking claws 79 of the front sub annular disk 41 are respectively fitted, relative movement of the front end plate 4 and the front annular disk 40 and the front sub annular disk 41 along the axial direction of each other is restricted. . As a result, when assembling the cylinder devices 1c and 1e, the front end plate 4 is installed with the working oil filled in the outer cylinder 2 at this time. At this time, the front cylinder fitting portion 26 of the front end plate 4 is assembled. Since the front annular disc 40 and the front sub annular disc 41 can be assembled in a fitted state, the workability is improved.

The cylinder devices 1a to 1e according to the first to fifth embodiments described above are used between the bogies of the railway vehicle and the vehicle body, and are horizontally placed to absorb the vibrations due to the installation state of the rails to suppress the meandering of the bogies. So-called yaw dampers, which are type shock absorbers, have been described by way of example. However, the present invention is not limited to this, and it may be used for a lateral motion damper which is used between a bogie and a car body in a rail car and damps relative lateral vibration of the bogie and the car body. It may be used as a vertical motion damper provided parallel to the shaft spring to damp the vertical motion due to the installation state of the rail, or a vehicle body provided on the vehicle body and the vehicle body to suppress relative motion between the vehicle bodies due to undulation or wind of the rail It may be used for an interspace damper.
Furthermore, it may be applied to, for example, hydraulic shock absorbers for vehicles (in this case, for example, vertical shock absorbers that cushion upward and downward vibrations), and various machines and buildings serving as vibration sources. It is possible to apply also to the buffer used for etc.

According to a first aspect of the cylinder device, a cylinder, a piston slidably fitted in the cylinder, and an outer cylinder disposed on an outer peripheral side of the cylinder and forming a reservoir chamber between the cylinder and the cylinder And an end member closing an end of the cylinder and an end of the outer cylinder, and an annular disc provided between the end member and the cylinder, the annular disc or the end Between the part member and the annular disc, there is provided a cylinder side opening that opens into the cylinder, and the annular disc is provided with a reservoir chamber side opening that communicates with the cylinder side opening and opens into the reservoir chamber. A rotation restricting portion which restricts relative rotation between each other is formed between the end member and the annular disc.
In a second aspect of the cylinder device according to the first aspect, at least one of the cylinder side opening and 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 disc, and the pressure chamber has the cylinder side opening and the reservoir chamber. It communicates with the side opening.
According to a fourth aspect of the cylinder device, in the third aspect, an annular seat portion projecting annularly is provided on the cylinder side of the end member, and the annular seat portion is disposed to abut the annular disc. The pressure chamber is formed inside the annular sheet portion.
According to a fifth aspect of the cylinder device, in the third aspect, an annular groove is formed in the end member, and the annular disc 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 according to any one of the first to fifth aspects, a secondary annular disc is disposed between the annular disc and the cylinder.
As a seventh aspect of the cylinder device according to the sixth aspect, the groove as the cylinder side opening, the groove as the reservoir side opening, and the groove as the reservoir side opening are provided on the surface of the annular disk on which the sub annular disk abuts. A communication groove is formed as the pressure chamber, which communicates the cylinder side opening with the reservoir chamber side opening.
According to 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 disc. Provide
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.

  While only certain embodiments of the invention have been described above, it will be appreciated that various changes and modifications may be made to the illustrated embodiments without departing substantially from the novel teachings and advantages of the invention. Will be readily understood by those skilled in the art. Accordingly, it is intended that the embodiments added with such alterations or improvements are also included in the technical scope of the present invention. The above embodiments may be combined arbitrarily.

  This application claims the 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, 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 regulating part (rotation regulating part), 28 front annular seat part, 33 rear outer cylinder fitting part, 34 rear cylinder fitting part, 35 concave rotation regulating Part (rotation regulating part), 36 rear annular seat part, 40 front annular disc, 41 front sub annular disc, 43 convex rotation regulating part (rotation regulating part) 45, 62 cylinder side opening, 48, 64 reservoir chamber side opening , 50, 65 pressure chamber, 55 rear annular disk, 56 rear secondary annular disk, 60 convex rotation regulating portion (rotation regulating portion), 72 cylinder communicating groove (groove), 73 reservoir chamber communicating groove (groove) , 74 Spoken groove, 78 locking groove (movement restricting portion), 79 locking claw portion (movement restricting portion)

Claims (8)

A cylinder device, wherein the cylinder device
With the cylinder,
A piston slidably fitted in the cylinder;
An outer cylinder disposed on an outer peripheral side of the cylinder and forming a reservoir chamber with the cylinder ;
An end member closing the end of the cylinder and the end of the outer cylinder;
Includes an end portion member, and one or more annular disc Ru sandwiched between the front end or the rear end of the cylinder,
Forming a pressure chamber between the end member and the disc on the end member side;
A cylinder-side opening that opens into the cylinder and communicates the inside of the cylinder with the pressure chamber ;
A reservoir chamber side opening that opens into the reservoir chamber and communicates the reservoir chamber with the pressure chamber ;
A cylinder device provided with The cylinder device according to claim 1, wherein a rotation restricting portion that restricts relative rotation between each other is formed between the end member and the disk . The cylinder device according to claim 2 , wherein at least one of the cylinder side opening and the reservoir chamber side opening is formed around the rotation restricting portion. Providing an annular seat portion projecting annularly on the cylinder side of the end member;
Placing the disc in contact with the annular seat portion,
The cylinder device according to any one of claims 1 to 3 , wherein the pressure chamber is formed inside the annular seat portion. Forming an annular groove in the end member;
Placing the disc so as to cover the annular groove;
The cylinder device according to any one of claims 1 to 3 , wherein the pressure chamber is formed in the annular groove portion. The disc has an annular disc on the end member side, and a sub annular disc which is on the cylinder side and abuts on the annular disc.
A circumferentially extending communication groove , a groove as the cylinder side opening, and a groove as the reservoir side opening are formed on the surface of the annular disk on which the sub annular disk abuts ,
The cylinder device according to any one of claims 1 to 3 , wherein the pressure chamber is formed in the communication groove . The cylinder device according to any one of claims 1 to 3, wherein a movement restricting portion that restricts relative movement in the axial direction is provided between the end member and the disk . The end member is provided with a locking groove as the movement restricting portion,
The cylinder device according to claim 7 , wherein the pressure chamber is formed in the locking groove.

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