JP6914415B2 - Buffer - Google Patents

Description

The present invention relates to a double-cylinder horizontal shock absorber used in railway vehicles and the like.

Patent Document 1 discloses a double-cylinder horizontal shock absorber in which a liquid chamber and a reservoir chamber in the cylinder are partitioned by a partition portion fitted to the outside of the cylinder.

Japanese Unexamined Patent Publication No. 2009-2436334

In the shock absorber described in Patent Document 1, since an annular passage having an air bleeding structure cannot be simultaneously molded in the partition portion, a step of machining an annular groove into the inner peripheral surface (cylinder fitting surface) of the partition portion is required. It was necessary and complicated the manufacturing process.

An object of the present invention is to provide a shock absorber capable of forming an air bleeding structure by reducing man-hours for processing a partition portion.

The shock absorber according to the embodiment of the present invention includes a cylinder in which a working fluid is sealed and a piston slides, a rod in which the piston is connected and a part of which protrudes to the outside of the cylinder, and an outer circumference of the cylinder. A reservoir chamber formed between the cylinder and the outer cylinder and filled with a working fluid and a gas, and a liquid chamber provided at both ends of the cylinder and the outer cylinder and in the cylinder. It has a partition portion that separates the cylinder from the reservoir chamber, and at least one of the partition portions has a fitting portion that is fitted inside the cylinder and a fitting portion that is more than the fitting portion. It has a flange portion formed with a large diameter and facing the end face of the cylinder, and an annular spacer inserted outside the fitting portion is provided between the end face of the cylinder and the collar portion. The outer periphery of the fitting portion is formed by a chamfered portion formed on the inner peripheral side of the end surface of the cylinder or an annular second spacer arranged between the end surface of the cylinder and the spacer. An annular passage is provided, and a first continuous passage for communicating the liquid chamber in the cylinder and the annular passage is provided between the fitting portion and the cylinder, and the spacer is provided with the annular passage. It is characterized in that a second communication passage that communicates with the reservoir chamber and a positioning portion that determines a position in the circumferential direction with respect to the one partition portion are formed.

According to the shock absorber according to the embodiment of the present invention, it is possible to reduce the man-hours for processing the partition portion and to form an air bleeding structure in the shock absorber.

It is sectional drawing of the shock absorber which concerns on 1st Embodiment. It is explanatory drawing of the air bleeding structure on the right side of the shock absorber of FIG. It is a top view of the spacer used for the air bleeding structure of FIG. It is a top view of the partition part combined with the spacer of FIG. It is explanatory drawing of the air bleeding structure on the left side of the shock absorber of FIG. It is a top view of the spacer used for the air bleeding structure of FIG. It is a top view of the partition part combined with the spacer of FIG. It is explanatory drawing of 2nd Embodiment, and is the explanatory view of the air bleeding structure on the right side. It is explanatory drawing of 2nd Embodiment, and is the exploded perspective view of the 1st spacer, the 2nd spacer, and the partition part to be combined. It is explanatory drawing of the 3rd Embodiment, and is the explanatory view of the air bleeding structure on the right side. FIG. 10 is a cross-sectional view taken along the line AA', which is an explanatory view of another form of the positioning portion, and shows a spacer when the positioning portion is applied to the third embodiment and a partition portion combined with the spacer. It is a figure. It is explanatory drawing of 4th Embodiment and is explanatory drawing of the air bleeding structure on the right side. It is explanatory drawing of another form of the positioning part, and is the figure which shows the spacer when the positioning part is applied to the 4th Embodiment, and the partition part combined with the spacer.

(First Embodiment) The first embodiment will be described with reference to FIGS. 1 to 7.
Here, a double-cylinder horizontal biflow type hydraulic buffer 1 (hereinafter referred to as “buffer 1”) arranged substantially horizontally between the vehicle body and the bogie of a railway vehicle will be illustrated. In the following description, the left direction (left side) and the right direction (right side) in FIG. 1 are defined as the left direction (left side) and the right direction (right side) in the shock absorber 1, and the upward direction (upper side) and the downward direction (upper side) in FIG. The lower side) is referred to as an upward direction (upper side) and a downward direction (lower side) in the shock absorber 1. Further, a plane including an axis is referred to as an axis plane, and a plane perpendicular to the axis is referred to as an axis right angle plane.

As shown in FIG. 1, the shock absorber 1 has cylinders 2 and outer cylinders 3 arranged concentrically. Between the cylinder 2 and the outer cylinder 3, the left end of the cylinder 2 and the outer cylinder 3 is closed by the partition portion 4, and the right end of the cylinder 2 and the outer cylinder 3 is closed by the partition portion 5, thereby forming a ring shape. The reservoir chamber 6 is formed. The partition portion 5 is divided into a partition portion 7 that closes the right end of the cylinder 2 and a partition portion 8 that closes the right end of the outer cylinder 3. A bracket 9 connected to the vehicle body side of the railway vehicle is fixed to the partition portion 8. The outer peripheral edge of the partition 8 is connected to the right end of the outer cylinder 3. In the partition portion 5, the partition portion 7 and the partition portion 8 are integrated by fitting the right end of the partition portion 7 (the right end of the flange portion 25 described later) into the recess 10 of the partition portion 8.

A piston 13 is slidably fitted inside the cylinder 2. The inside of the cylinder 2 is divided into a first liquid chamber 14 on the left side and a second liquid chamber 15 on the right side by a piston 13. The first liquid chamber 14 and the second liquid chamber 15 are filled with the working liquid, and the reservoir chamber 6 is filled with the working liquid and air. The right end of the rod 16 is connected to the piston 13. The left end side of the rod 16 passes through the first liquid chamber 14 and the partition portion 4 and extends to the outside of the cylinder 2. A bracket 17 connected to the bogie side of the railroad vehicle is fixed to the left end of the rod 16. Further, a tubular cover (not shown) that covers the rod 16 extending from the partition portion 4 is attached to the bracket 17.

The piston 13 blocks the flow of the hydraulic fluid from the second liquid chamber 15 to the first liquid chamber 14 during the contraction stroke of the rod 16, and the second liquid chamber 15 reaches a predetermined pressure when the hydraulic pressure in the second liquid chamber 15 reaches a predetermined pressure. A contraction-side relief valve 18 is provided to release the hydraulic pressure of the liquid chamber 15 to the first liquid chamber 14. Further, when the hydraulic fluid flows from the first liquid chamber 14 to the second liquid chamber 15 to the piston 13 during the extension stroke of the rod 16 and the hydraulic pressure of the first liquid chamber 14 reaches a constant pressure. An extension-side relief valve 19 is provided to release the hydraulic pressure of the first liquid chamber 14 to the second liquid chamber 15. The partition portion 7 is provided with a relief valve 20 that opens according to the hydraulic pressure of the second liquid chamber 15 and releases the hydraulic pressure of the second liquid chamber 15 to the reservoir chamber 6. Further, the partition portion 7 is provided with a check valve 21 that allows only the flow of the hydraulic fluid from the reservoir chamber 6 to the second liquid chamber 15.

Next, with reference to FIGS. 2 to 4, an air bleeding structure for discharging the air stagnant in the second liquid chamber 15 to the reservoir chamber 6 will be described.
The partition portion 7 is larger than the fitting portion 23, which is formed in a substantially cylindrical shape and whose outer peripheral surface 24 is fitted to the inner peripheral surface 11 (inside of the cylinder) on the right end side of the cylinder 2, and the fitting portion 23. It has a collar portion 25 formed with a diameter and an annular surface 26 formed on the right side (anti-rod side) end surface 12 of the cylinder 2 and opposed to the end surface 12. An annular spacer 31 inserted outside the fitting portion 23 of the partition portion 7 is provided between the end surface 12 of the cylinder 2 and the annular surface 26 of the flange portion 25 of the partition portion 7. The inner diameter of the spacer 31 is formed so as to have a predetermined tolerance (fitting) with respect to the outer diameter of the fitting portion 23 of the partition portion 7. Further, the outer diameter of the spacer 31 is equal to the outer diameter of the flange portion 25 of the partition portion 7.

The right side surface 32 of the spacer 31 is in contact with the annular surface 26 of the flange portion 25 of the partition portion 7. A protrusion 34 (positioning portion) protruding inward in the radial direction is formed on the inner peripheral surface 33 of the spacer 31. The spacer 31 is positioned in the circumferential direction (around the axis) with respect to the partition portion 7 by engaging the protrusion 34 with the groove portion 27 (recess) formed in the fitting portion 23 of the partition portion 7, which will be described later. Further, the inner peripheral surface 33 of the spacer 31 is provided with a notch 35 (second continuous passage) extending radially outward (lower side in FIGS. 2 and 3). The notch 35 is arranged at a position facing the protrusion 34 (a position of 180 ° when the protrusion 34 is a position of 0 °).

The end surface 12 of the cylinder 2 is brought into contact with the left side surface 36 of the spacer 31. In the cylinder 2, an annular chamfered portion 38 is formed at the ridge portion of the end surface 12 and the inner peripheral surface 11. As a result, on the outer periphery of the fitting portion 23 of the partition portion 7, an annular passage 39 partitioned by the outer peripheral surface 24 of the fitting portion 23, the left side surface 36 of the spacer 31, and the chamfered portion 38 of the cylinder 2 is provided. .. The annular passage 39 is communicated with the second liquid chamber 15 by the groove portion 27 (first communication passage) described above. The groove portion 27 (recess) is a key groove-shaped groove extending in the axial direction (left-right direction in FIG. 2) of the fitting portion 23 of the partition portion 7. In the partition portion 7, the groove portion 27 is arranged in the upper part on the left end side of the second liquid chamber 15 in a state where the shock absorber 1 is attached to the vehicle.

Further, the annular passage 39 is communicated with the reservoir chamber 6 by the notch 35 (second communication passage) of the spacer 31. By engaging the protrusion 34 with the groove 27 (recess) of the fitting portion 23 of the partition portion 7, the spacer 31 has the notch 35 at the lowermost position while the shock absorber 1 is attached to the vehicle. Positioned so as to. As described above, the air bleeding structure on the second liquid chamber 15 side has a groove 27 (first continuous passage), an annular passage 39, and a notch 35 (second continuous passage) at the upper part of the right end side corner of the second liquid chamber 15. It is configured to communicate with the lowermost region on the right end side of the reservoir chamber 6 via a passage).

Here, with the shock absorber 1 attached to the vehicle, the notch 35 of the spacer 31 extends to the right end of the reservoir chamber 6 so that the groove 27 communicates with the upper part of the right end side corner of the second liquid chamber 15. It is desirable to position the partition portion 7 (fitting portion 23) in the circumferential direction (around the axis) so as to communicate with the lowermost region on the side, but the groove portion 27 (first communication passage) of the partition portion 7 Regardless of the position of the notch 35 (second communication passage) of the spacer 31 in the circumferential direction, air is blown from the second liquid chamber 15 to the reservoir chamber by the pressure acting on the second liquid chamber 15. It can be discharged to 6.

Next, with reference to FIGS. 5 to 7, an air bleeding structure for discharging the air stagnant in the first liquid chamber 14 to the reservoir chamber 6 will be described.
The partition portion 4 is formed into a fitting portion 43 which is formed in a substantially cylindrical shape and whose outer peripheral surface 44 is fitted to the inner peripheral surface 11 on the left end side of the cylinder 2, and which has a diameter larger than that of the fitting portion 43. It has a collar portion 45 on which an annular surface 46 facing the end surface 40 on the left side (rod side) of the cylinder 2 is formed. An annular spacer 51 inserted outside the fitting portion 43 of the partition portion 4 is provided between the end surface 40 of the cylinder 2 and the annular surface 46 of the flange portion 45 of the partition portion 4. The spacer 51 is the same component as the spacer 31 described above, but is given a different reference numeral for convenience. Further, the outer diameter of the fitting portion 43 of the partition portion 4 is equal to the outer diameter of the fitting portion 23 of the partition portion 7.

The left side surface 52 of the spacer 51 is in contact with the annular surface 46 of the flange portion 45 of the partition portion 4. A protrusion 54 (positioning portion) protruding inward in the radial direction is formed on the inner peripheral surface 53 of the spacer 51. The spacer 51 is positioned in the circumferential direction (around the axis) with respect to the partition portion 4 by engaging the protrusion 54 with the groove portion 47 (first continuous passage) formed in the fitting portion 43 of the partition portion 4. .. Further, the inner peripheral surface 53 of the spacer 51 is provided with a notch 55 (second continuous passage) extending radially outward (lower side in FIGS. 5 and 6). The notch 55 is arranged at a position facing the protrusion 54.

The end surface 40 of the cylinder 2 is brought into contact with the right side surface 56 of the spacer 51. In the cylinder 2, an annular chamfered portion 58 is formed at the ridge portion of the end surface 40 and the inner peripheral surface 11. As a result, on the outer periphery of the fitting portion 43 of the partition portion 4, an annular passage 59 defined by the outer peripheral surface 44 of the fitting portion 43, the right side surface 56 of the spacer 51, and the chamfered portion 58 of the cylinder 2 is provided. .. The annular passage 59 is communicated with the first liquid chamber 14 by the groove portion 47 (first communication passage) described above. The groove portion 47 (recessed portion) is a key groove-shaped groove extending in the axial direction (left-right direction in FIG. 5) of the fitting portion 43 of the partition portion 4. In the partition portion 4, the groove portion 47 is arranged on the upper upper side of the first liquid chamber 14 on the left end side in a state where the shock absorber 1 is attached to the vehicle.

Further, the annular passage 59 is communicated with the reservoir chamber 6 by a notch 55 (second communication passage) of the spacer 51. The spacer 51 has a notch 55 on the lowermost side in a state where the shock absorber 1 is attached to the vehicle by engaging the protrusion 54 with the groove 47 (first passage) of the fitting portion 43 of the partition portion 4. It is positioned so that it is in position. As described above, the air bleeding structure on the first liquid chamber 14 side has a groove 47 (first continuous passage), an annular passage 59, and a notch 55 (second continuous passage) at the upper part of the left end side corner of the first liquid chamber 14. It is configured to communicate with the lowermost region on the left end side of the reservoir chamber 6 via a passage).

Similar to the air bleeding structure on the second liquid chamber 15 side described above, the groove 47 extends so as to communicate with the upper part of the left end side corner of the first liquid chamber 14 with the shock absorber 1 attached to the vehicle. It is desirable to position the partition portion 4 (fitting portion 43) in the circumferential direction (around the axis) so that the notch 55 of the spacer 51 communicates with the lowest region on the left end side of the reservoir chamber 6. The pressure acting on the first liquid chamber 14 regardless of the position in the circumferential direction of the groove portion 47 (first communication passage) of the portion 4 and the notch 55 (second communication passage) of the spacer 51. Air can be discharged from the first liquid chamber 14 to the reservoir chamber 6.

For example, the position where the notch 35 (second passage) formed in the spacer 31 on the second liquid chamber 15 side is provided is a position facing the protrusion 34 (180 ° when the protrusion 34 is a 0 ° position). However, the opening on the reservoir chamber 6 side of the second passage may be opened in the working fluid in the reservoir chamber 6 with the shock absorber 1 attached to the vehicle.

Here, as shown in Patent Document 1 described above, in the structure in which the partition portion is fitted to the outer peripheral surface (outside of the cylinder) of the cylinder, the annular passage (annular groove) constituting the air bleeding structure is inside the partition portion. It is formed on the peripheral surface (cylinder fitting surface). Since this annular passage (annular groove) cannot be simultaneously molded when the partition portion is molded, it is necessary to separately form the inner peripheral surface of the partition portion after molding by machining, which complicates the manufacturing process. Was there. Further, in the structure in which the partition portion is fitted to the outer peripheral surface of the cylinder, the partition portion is enlarged in the radial direction, and the degree of freedom in designing the shock absorber is restricted.

On the other hand, in the first embodiment, the partition portions 7 and 4 are not fitted on the outer peripheral surface (outside of the cylinder) of the cylinder 2, but on the inner peripheral surface 11 (inside of the cylinder) of the cylinder 2. , 4 fitting portions 23, 43 are fitted together, and annular chamfered portions 38, 58 are formed on the ridges of the inner peripheral surface 11 and the end surfaces 12, 40 of the cylinder 2, thereby forming the partition portion 7, Since the annular passages 39 and 59 are provided on the outer periphery of the fitting portions 23 and 43 of No. 4, the step of grooving the partition portions 7 and 4 after molding, that is, the step of machining the groove in the partition portions 7 and 4 is performed. It is unnecessary and the manufacturing process can be greatly simplified. Further, since the fitting portions 23 and 43 are fitted to the inner peripheral surface 11 of the cylinder 2, the partition portions 7 and 4, and thus the shock absorber 1 can be miniaturized in the radial direction.

The details of the first embodiment have been described above, but the effects of the first embodiment are shown below.
According to this embodiment, a cylinder (2) in which a working fluid is sealed and a piston (13) slides is connected to a rod (16) in which a part of the cylinder (13) protrudes to the outside of the cylinder (2). ), The outer cylinder (3) covering the outer periphery of the cylinder (2), and the reservoir chamber (6) formed between the cylinder (2) and the outer cylinder (3) and filled with the hydraulic fluid and gas. And a buffer provided at both ends of the cylinder (2) and the outer cylinder (3) and having a partition portion (7, 4) for partitioning the liquid chamber (15, 14) and the reservoir chamber (6) in the cylinder. In the vessel (1), at least one of the partition portions (7, 4) is the fitting portion (23, 43) fitted inside the cylinder (2). The cylinder (2) has a collar portion (25, 45) formed having a diameter larger than that of the fitting portion (23, 43) and facing the end surface (12, 40) of the cylinder (2). An annular spacer (31,51) inserted outside the fitting portion (23,43) is provided between the end face (12,40) and the flange portion (25,45), and the fitting portion (31,51) is provided. An annular passage (39,59) is provided on the outer periphery of the 23,43), and a liquid chamber (15,) in the cylinder (2) is provided between the fitting portion (23,43) and the cylinder (2). The first communication passage (27,47) for communicating the 14) and the annular passage (39,59) is provided, and the spacer (31,51) has the annular passage (39,59) and the reservoir chamber (6). A second communication passage (35, 55) is formed, and a positioning portion (34, 54) that determines the position in the circumferential direction with respect to one of the partition portions (7, 4) is formed.

Therefore, in the first embodiment, since the annular passage constituting the air bleeding structure of the liquid chamber is provided on the outer periphery of the fitting portion fitted inside the cylinder, the step of grooving the partition portion after molding. That is, the step of machining a groove (annular passage) in the partition portion becomes unnecessary. As a result, the manufacturing process can be simplified, and the manufacturing cost can be reduced. Further, since the fitting portion is fitted inside the cylinder, the partition portion and thus the shock absorber can be miniaturized in the radial direction with respect to the structure in which the partition portion is fitted outside the cylinder.

Further, in the first embodiment, the annular passage (39, 59) is composed of chamfered portions (38, 58) formed on the inner peripheral side of the end faces (12, 40) of the cylinder 2.
Further, the first continuous passage (27, 47) is formed by a recess formed on the outer peripheral surface (24, 44) of the fitting portion (23, 43) and extending in the axial direction.

Further, the positioning portion is composed of protrusions (34, 54) extending radially inward from the inner peripheral surface (33, 53) of the spacer (31, 51), and the protrusions (34, 54) constituting the positioning portion are the first. By engaging with the single passage (27, 47), the spacer (31, 51) can be positioned in the circumferential direction with respect to the partition portion (7, 4) to be combined.

Further, in the conventional structure in which the partition portion is fitted to the outside of the cylinder, a step of processing an orifice for communicating the annular passage and the liquid chamber in the partition portion after molding is required, but in the first embodiment, the step is required. Since the second passage (35, 55) is composed of a notch extending radially outward from the inner peripheral surface (33, 53) of the spacer (31, 51), a step of processing an orifice in the partition portion after molding. Is no longer needed.

(Second Embodiment) Next, the second embodiment will be described with reference to FIGS. 8 and 9. The same or equivalent components as those in the first embodiment are given the same names and reference numerals, and detailed description thereof will be omitted. In the air bleeding structure according to the second embodiment, the air bleeding structure of the first liquid chamber 14 and the air bleeding structure of the second liquid chamber 15 are symmetrical as in the air bleeding structure according to the first embodiment described above. Here, in order to simplify the description of the specification, only the air bleeding structure of the second liquid chamber 15 shown in FIG. 8 will be described, and the air bleeding structure of the first liquid chamber 14 will be omitted.

In the first embodiment, the annular passage 39 is provided on the outer periphery of the fitting portion 23 of the partition portion 7 by forming an annular chamfered portion 38 on the ridge portion between the end surface 12 and the inner peripheral surface 11 of the cylinder 2. ..
On the other hand, in the second embodiment, the partition portion 7 is fitted by arranging the annular second spacer 61 having an L-shaped cross section on the axial plane between the end surface 12 of the cylinder 2 and the spacer 31. An annular passage 69 is provided on the outer circumference of the joint portion 23 and the inner circumference of the second spacer 61.

The second spacer 61 is formed in a substantially cylindrical shape. An inner flange portion 62 is formed on the inner peripheral edge portion on the right end side of the second spacer 61. The end surface 12 of the cylinder 2 is brought into contact with the inner flange portion 62 of the second spacer 61. The right end surface 63 of the second spacer 61 is in contact with the left side surface 36 of the spacer 31. The outer peripheral surface 41 of the cylinder 2 is fitted to the inner peripheral surface 64 of the second spacer 61. The inner diameter of the inner flange portion 62 of the second spacer 61 is larger than the outer diameter of the fitting portion 23 of the partition portion 7, and by extension, the inner diameter of the cylinder 2. As a result, the inner circumference of the second spacer 61 is partitioned by the outer peripheral surface 24 of the fitting portion 23, the end surface 12 of the cylinder 2, the inner flange portion 62 of the second spacer 61, and the left side surface 36 of the first spacer 31. Circumferential passage 69 is provided.

According to the second embodiment, it is possible to obtain the same effect as that of the first embodiment described above. Further, in the second embodiment, the shape of the second spacer 61, that is, the inner diameter and height (axial length) of the inner flange portion 62, and the flow path area of the annular passage 69 are changed. The orifice characteristics due to the hydraulic fluid flowing through the annular passage 69 can be adjusted.

(Third Embodiment) Next, the third embodiment will be described with reference to FIG. The same or equivalent components as those in the first and second embodiments are given the same names and reference numerals, and detailed description thereof will be omitted. In the air bleeding structure according to the third embodiment, the air bleeding structure of the first liquid chamber 14 and the air bleeding structure of the second liquid chamber 15 are symmetrical like the air bleeding structure according to the first and second embodiments described above. Therefore, only the air bleeding structure of the second liquid chamber 15 will be described.

In the second embodiment, the annular passage 69 is provided on the inner circumference of the second spacer 61 by arranging the annular second spacer 61 between the end surface 12 of the cylinder 2 and the spacer 31.
On the other hand, in the third embodiment, the annular passage 79 is provided on the outer periphery of the fitting portion 23 of the partition portion 7 without providing the second spacer 61 in the second embodiment.

The partition portion 7 has an annular step portion 71 formed between the fitting portion 23 and the flange portion 25. The outer diameter of the step portion 71 is larger than the outer diameter of the fitting portion 23, that is, the inner diameter of the cylinder 2, and smaller than the outer diameter of the cylinder 2. The inner peripheral surface 33 of the spacer 31 is fitted to the outer peripheral surface 72 of the step portion 71 of the partition portion 7. The plate thickness (axial length) of the spacer 31 is formed to be thicker (longer) than the height (axial length) of the step portion 71 of the partition portion 7, and is the same as the plate thickness of the spacer 31 and the height of the step portion 71. The difference is the axial length of the flow path of the annular passage. As a result, on the outer periphery of the fitting portion 23 of the partition portion 7, the annular passage 79 is partitioned by the outer peripheral surface 24 of the fitting portion 23, the step portion 71, the inner peripheral surface 33 of the spacer 31, and the end surface 12 of the cylinder 2. Is provided.

According to the third embodiment, it is possible to obtain the same effects as those of the first and second embodiments described above. Further, in the third embodiment, the shape of the step portion 71 of the partition portion 7, that is, the outer diameter and height (axial length) of the step portion 71, and the plate thickness (axial length) and extension of the spacer 31. Alternatively, by changing the flow path area of the annular passage 79, the orifice characteristic due to the working fluid flowing through the annular passage 79 can be adjusted.

Further, in the first to third embodiments described above, a keyway-shaped groove 27 (see FIG. 4) extending in the axial direction is formed on the outer peripheral surface 24 of the fitting portion 23 of the partition portion 7 to form the first continuous passage. However, as shown in FIG. 11, the chamfered portion 88 can be formed by chamfering the outer peripheral surface 24 of the fitting portion 23 with a plane parallel to the axial plane to form the first continuous passage. Note that FIG. 11 is a diagram in which the first continuous passage composed of the chamfered portion 88 is applied to the third embodiment.
In this case, the spacer 81 to be combined is brought into contact with the chamfered portion 88 of the fitting portion 23 so that the end surface 85 of the protrusion 84 (positioning portion) is brought into contact with the chamfered portion 88 of the fitting portion 23 in the circumferential direction (axially) with respect to the partition portion 7 to be combined. It can be positioned.

(Fourth Embodiment) Next, the fourth embodiment will be described with reference to FIG. The same or equivalent components as those in the first to third embodiments are given the same names and reference numerals, and detailed description thereof will be omitted. In the air bleeding structure according to the fourth embodiment, the air bleeding structure of the first liquid chamber 14 and the air bleeding structure of the second liquid chamber 15 are symmetrical like the air bleeding structure according to the first to third embodiments described above. Therefore, only the air bleeding structure of the second liquid chamber 15 will be described.

In the fourth embodiment, a part of the outer cylinder 3 is projected inward in the radial direction and brought into contact with the positioning portion 94 of the spacer 91 at the upper position corresponding to the spacer 91 on the right side of the outer cylinder 3. ..

The outer cylinder 3 is formed with a protrusion 92 that projects inward in the radial direction. The protrusion 92 is provided on the upper right side corresponding to the axial position of the spacer 91. The outer diameter of the spacer 31 in the first embodiment is equal to the outer diameter of the flange portion 25 of the partition portion 7, whereas the outer diameter of the spacer 91 in the fourth embodiment is the outer diameter of the flange portion 25 of the partition portion 7. Greater than. The spacer 91 is a flat surface portion 94 formed by cutting out the upper portion (opposite side to the notch 35) in a chord shape, in other words, a flat surface in which the outer peripheral surface 24 of the partition portion 7 is chamfered by a single plane parallel to the axial plane. It has a flat surface portion 94 formed by chamfering with a plane parallel to the surface.

Then, the spacer 91 is positioned in the circumferential direction with respect to the outer cylinder 3 by bringing the flat surface portion 94 of the spacer 91 into contact with the protrusion 92 of the outer cylinder 3. That is, the flat surface portion 94 of the spacer 91 in the fourth embodiment functions as a positioning portion like the protrusion 34 of the spacer 31 in the first embodiment. In the fourth embodiment, the shape of the partition portion 7 is the same as that in the first embodiment.

According to the fourth embodiment, the spacer 91 can be positioned in the circumferential direction with respect to the outer cylinder 3. Further, in the conventional structure in which the partition portion is fitted to the outside of the cylinder, a step of processing an orifice for communicating the annular passage and the liquid chamber in the partition portion after molding is required, but in the fourth embodiment, it is necessary. Since the second passage 35 is formed by a notch extending radially outward from the inner peripheral surface 93 of the spacer 91, the step of processing an orifice in the partition portion after molding becomes unnecessary.

(Aspects of the Invention) Hereinafter, each aspect of the invention recognized as being patentable in the present application will be described. In each of the following items, each of the items (1) to (8) corresponds to each of the claims 1 to 8 described in the claims.

(1) A cylinder in which a working fluid is sealed and a piston slides, a rod in which the piston is connected and a part of which protrudes to the outside of the cylinder, an outer cylinder covering the outer periphery of the cylinder, and the cylinder. A reservoir chamber formed between the outer cylinder and filled with a working liquid and a gas, and a partition portion provided at both ends of the cylinder and the outer cylinder and partitioning the liquid chamber in the cylinder and the reservoir chamber. A shock absorber having the above, wherein at least one of the two partition portions is formed with a fitting portion fitted inside the cylinder and a diameter larger than that of the fitting portion. It has a flange portion facing the end face of the cylinder, and an annular spacer inserted outside the fitting portion is provided between the end surface of the cylinder and the flange portion, and the fitting portion is provided with an annular spacer. An annular passage is provided on the outer periphery, and a first continuous passage for communicating the liquid chamber in the cylinder and the annular passage is provided between the fitting portion and the cylinder, and the spacer is provided with a first continuous passage. A shock absorber characterized in that a second continuous passage that communicates the annular passage and the reservoir chamber, and a positioning portion that determines a position in the circumferential direction with respect to the one partition portion are formed.
In the aspect of this section, the step of machining a groove (annular passage) in the partition portion after molding becomes unnecessary. Further, the partition portion and the shock absorber can be miniaturized in the radial direction with respect to the structure in which the partition portion is fitted to the outside of the cylinder.
(2) The shock absorber according to item (1), wherein the first passage is formed by a recess formed on the outer peripheral surface of the fitting portion and extending in the axial direction.
In the aspect of this section, the step of processing the first continuous passage in the partition portion (fitting portion) after molding becomes unnecessary.
(3) The shock absorber according to items (1) and (2), wherein the annular passage is composed of a chamfered portion formed on the inner peripheral side of the end surface of the cylinder.
In the aspect of this section, the step of grooving the inner peripheral surface of the partition portion after molding becomes unnecessary.
(4) The shock absorber according to items (1) and (2), wherein the annular passage is formed on the inner circumference of an annular second spacer arranged between the end face of the cylinder and the spacer. ..
In the aspect of this section, the orifice characteristic by the working fluid flowing through the annular passage can be adjusted by changing the shape of the second spacer and the flow path area of the annular passage.
(5) The shock absorber according to item (4), wherein the second spacer is positioned in the radial direction by the outer peripheral surface of the cylinder.
In the aspect of this section, the second spacer can be positioned in the radial direction with respect to the cylinder without machining the second spacer after molding.
(6) The shock absorber according to items (1) to (5), wherein the positioning portion is composed of protrusions extending radially inward from the inner peripheral surface of the spacer.
In the aspect of this section, the spacer can be positioned in the circumferential direction with respect to the partition portion without machining the spacer after molding.
(7) The shock absorber according to item (6), wherein the protrusion constituting the positioning portion is engaged with the first continuous passage.
In the aspect of this section, the step of processing the groove for engaging the protrusion in the partition portion becomes unnecessary.
(8) The shock absorber according to (1) to (7), wherein the second passage is formed by a notch extending radially outward from the inner peripheral surface of the spacer.
In the aspect of this section, the step of processing the orifice in the partition portion after molding becomes unnecessary.

The present invention is not limited to the above-described embodiment, and includes various modifications. For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the described configurations. Further, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Further, it is possible to add / delete / replace a part of the configuration of each embodiment with another configuration.

The present application claims priority based on Japanese Patent Application No. 2018-032069 filed on February 26, 2018. The entire disclosure, including the specification, claims, drawings, and abstract of Japanese Patent Application No. 2018-032069 filed February 26, 2018, is incorporated herein by reference in its entirety.

1 shock absorber, 2 cylinder, 3 outer cylinder, 6 reservoir chamber, 7 partition, 12 end face (cylinder), 14 1st liquid chamber, 15 2nd liquid chamber, 16 rod, 23 fitting part, 25 flange part, 27 Groove (1st passage), 31 spacer, 34 protrusion (positioning), 35 notch (2nd passage), 39 annular passage

Claims (6)

It is a shock absorber, and the shock absorber is
A cylinder in which the working fluid is sealed and the piston slides,
A rod to which the piston is connected and a part of which protrudes to the outside of the cylinder,
An outer cylinder that covers the outer circumference of the cylinder and
A reservoir chamber formed between the cylinder and the outer cylinder and filled with a working fluid and a gas.
It is provided at both ends of the cylinder and the outer cylinder, and has a partition portion for partitioning the liquid chamber in the cylinder and the reservoir chamber.
At least one of the two partition portions includes a fitting portion fitted inside the cylinder, a flange portion formed having a diameter larger than the fitting portion and facing the end face of the cylinder, and a flange portion. Have,
An annular spacer inserted outside the fitting portion is provided between the end surface of the cylinder and the flange portion.
On the outer circumference of the fitting portion, a chamfered portion formed on the inner peripheral side of the end surface of the cylinder or an annular passage formed by an annular second spacer arranged between the end surface of the cylinder and the spacer. Is provided,
A first communication passage for communicating the liquid chamber in the cylinder and the annular passage is provided between the fitting portion and the cylinder.
A shock absorber characterized in that the spacer is formed with a second communication passage that communicates the annular passage and the reservoir chamber, and a positioning portion that determines a position in the circumferential direction with respect to the one partition portion. In the shock absorber according to claim 1,
The first continuous passage is a shock absorber formed on the outer peripheral surface of the fitting portion and formed of recesses extending in the axial direction. In the shock absorber according to claim 1 or 2.
The second spacer is a shock absorber characterized in that it is positioned in the radial direction by the outer peripheral surface of the cylinder. In the shock absorber according to any one of claims 1 to 3,
The positioning portion is a shock absorber characterized by being formed by protrusions extending radially inward from the inner peripheral surface of the spacer. In the shock absorber according to claim 4,
A shock absorber characterized in that the protrusions constituting the positioning portion are engaged with the first continuous passage. In the shock absorber according to any one of claims 1 to 5,
The second passage is a shock absorber characterized by being formed by a notch extending radially outward from the inner peripheral surface of the spacer.

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