JPWO2019230549A1 - Manufacturing method of fluid pressure shock absorber and its liquid injection device - Google Patents

Abstract

It is equipped with a nozzle for injecting oil into the piston chamber and reservoir chamber in the cylinder. This nozzle has a plurality of, for example, four injection ports. On this, the virtual axis of each injection port has an angle larger than 0 degrees with respect to the virtual axis of the nozzle. Therefore, in the oil liquid injection step, when the oil liquid is injected, a nozzle having a liquid injection port facing the inner wall surface of the inner cylinder or the inner wall surface of the outer cylinder of the hollow tubular cylinder is used. It can be used to inject an oil solution along the inner wall surface of the inner cylinder or the inner wall surface of the outer cylinder.

Description

The present invention relates to a method for manufacturing a fluid pressure shock absorber suitable for injecting a working fluid into a cylinder forming a fluid pressure shock absorber such as a hydraulic shock absorber, and a liquid injection device thereof.

An oil liquid as a working fluid is injected (injected) into a cylinder forming a hydraulic shock absorber, which is a typical example of a fluid pressure shock absorber, by a liquid injection device. In the liquid injection device of this hydraulic shock absorber, a nozzle is arranged at the upper part of the cylinder, and a predetermined amount of oil liquid is injected into the cylinder by discharging the oil liquid downward from the liquid injection port provided in the nozzle. It has a structure (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2013-113402

According to Patent Document 1, since the oil liquid is discharged downward from the injection port of the nozzle, the discharged oil liquid may collide with the surface (liquid surface) of the oil liquid in the cylinder and foam. There is sex. If bubbles are generated on the surface of the oil liquid, a predetermined damping force cannot be obtained in the damping force measurement (operation test) performed immediately after that, which may result in a defective judgment.

An object of the present invention is to provide a method for manufacturing a fluid pressure shock absorber capable of suppressing foaming when injecting a working fluid into a cylinder, and an injecting device thereof.

The method for manufacturing a fluid pressure shock absorber according to an embodiment of the present invention is a method for manufacturing a fluid pressure shock absorber in which a working fluid is sealed, and the fluid pressure shock absorber has a hollow cylindrical shape having a bottom on one end side. The cylinder is provided, and the piston rod is projected from the other end side of the cylinder. In the manufacturing method, a nozzle having a fluid injection port facing the inner wall surface of the cylinder is used, and the inner wall surface of the cylinder is used. It has a liquid injection step for injecting the working fluid along the line.

Further, the fluid pressure shock absorber liquid injection device according to the embodiment of the present invention is a fluid pressure shock absorber liquid injection device in which a working fluid is sealed, and the fluid pressure shock absorber has a bottom on one end side. A cylinder is provided, a piston rod is projected from the other end side of the cylinder, the liquid injection device is provided with a nozzle for injecting a working fluid into the cylinder, and the nozzle is one or more injections. The virtual axis having a liquid port, passing through the opening surface of the liquid injection port, and extending in the flow direction of the working fluid is the relative movement direction between the nozzle and the fluid pressure shock absorber, and is the axial direction of the cylinder. It is characterized by having an angle larger than 0 degrees with respect to a virtual axis extending in.

According to one embodiment of the present invention, foaming when the working fluid is injected into the cylinder can be suppressed.

It is sectional drawing which shows the double-cylinder type hydraulic shock absorber which is the object of injection of the liquid injection device of the hydraulic shock absorber by embodiment of this invention. It is an overall block diagram which shows the liquid injection device of the hydraulic shock absorber by embodiment of this invention. It is sectional drawing which shows the nozzle in FIG. 2 enlarged. It is the bottom view which looked at the nozzle of FIG. 3 from the lower side. It is sectional drawing of the main part enlarged which shows the cylinder and the nozzle in the state of the 1st liquid injection step of a liquid injection step. It is sectional drawing of the main part enlarged which shows the cylinder and the nozzle in the state of the 2nd liquid injection step of a liquid injection step. It is a flowchart which shows an example of the manufacturing process of a fluid pressure shock absorber.

Hereinafter, as a method for manufacturing a fluid pressure shock absorber liquid injection device and a fluid pressure shock absorber according to the embodiment of the present invention, a hydraulic shock absorber liquid injection device and a hydraulic shock absorber for injecting an oil solution into a cylinder of the hydraulic shock absorber. The manufacturing method of the above will be described in detail with reference to FIGS. 1 to 7.

The configuration of the hydraulic shock absorber 1 including the double-cylinder type cylinder 2 in which the oil liquid is injected (injected) by the liquid injection device 11 of the hydraulic shock absorber according to the present embodiment will be described with reference to FIG.

The double-cylinder type cylinder 2 constituting the outer shape of the hydraulic shock absorber 1 is doubled by a small-diameter hollow cylinder-shaped inner cylinder 3 and a large-diameter outer cylinder 4 coaxially arranged on the outer circumference of the inner cylinder 3. It forms a tubular structure. The bottom portion of the outer cylinder 4 on one end side is closed as a bottom cap 5. On the other hand, the upper end side, which is the other end side of the cylinder 2, is closed by the rod guide 6.

Here, as shown in FIGS. 2, 5, and 6, the upper end side of the outer cylinder 4 is open toward the upper side like the inner cylinder 3 in the state before the rod guide 6 is attached. In this case, the upper end portion 4A of the outer cylinder 4 is extended from the upper end portion 3A of the inner cylinder 3. Further, the inside of the inner cylinder 3 is an inner wall surface 3B, and the inside of the outer cylinder 4 is an inner wall surface 4B. The portion of the inner wall surface 4B of the outer cylinder 4 that extends upward from the upper end portion 3A of the inner cylinder 3 is the extension portion 4B1.

The inside of the inner cylinder 3 of the cylinder 2 serves as a piston chamber 7 for accommodating the piston 9 described later, and the oil liquid corresponding to the approach volume of the piston rod 10 described later is released between the inner cylinder 3 and the outer cylinder 4. It is an annular reservoir chamber 8 of the above. A predetermined amount of oil is injected into the piston chamber 7 and the reservoir chamber 8 by the liquid injection device 11 of the hydraulic shock absorber, which will be described later, with the upper side open before the rod guide 6 is attached.

A piston 9 is fitted in the inner cylinder 3 of the cylinder 2, that is, in the piston chamber 7 so as to be movable in the axial direction. One end side of the piston rod 10 that has entered the inner cylinder 3 in the axial direction is attached to the piston 9, and the other end side of the piston rod 10 protrudes from the cylinder 2 via a rod guide 6 so as to be expandable and contractible. There is.

Next, the liquid injection device 11 of the hydraulic shock absorber as the liquid injection device of the fluid pressure shock absorber will be described with reference to FIGS. 2 to 7. The liquid injection device 11 of the hydraulic shock absorber targets the double-cylinder type cylinder 2 described above, and oils and liquids in the piston chamber 7 in the inner cylinder 3 and the reservoir chamber 8 between the inner cylinder 3 and the outer cylinder 4. Is to be injected.

In FIG. 2, the liquid injection device 11 of the hydraulic shock absorber injects (injects) an oil liquid into the cylinder 2 of the hydraulic shock absorber 1. The liquid injection device 11 of the hydraulic shock absorber has an oil storage tank 12 for storing an oil liquid for injecting into the cylinder 2, and the oil storage tank 12 is a pump mechanism on the downstream side via the first pipeline 13. It is connected to 14. The pump mechanism 14 includes a pump portion 14A connected to the oil storage tank 12 via the first pipeline 13 and an actuator 14B for driving the pump portion 14A, and the operating range of the actuator 14B is limited by the stopper 14C. By doing so, the flow rate of the oil liquid discharged from the pump unit 14A can be appropriately set.

The pump portion 14A of the pump mechanism 14 is connected to a shutoff valve 18D of the elevating mechanism 18 as a moving device described later, whose discharge side is located on the downstream side via the second pipeline 15. Here, the first pipeline 13 is provided with a check valve 16 for flowing the oil liquid only from the oil storage tank 12 toward the pump mechanism 14. The second pipeline 15 is provided with a check valve 17 that allows the oil liquid to flow only from the pump mechanism 14 toward the shutoff valve 18D.

The elevating mechanism 18 is arranged in the vicinity of a transport line (not shown) to which the inner cylinder 3 and the outer cylinder 4 in the state before the rod guide 6 is attached are conveyed. The elevating mechanism 18 moves (elevates) the shutoff valve 18D, the nozzle 19, and the like in the upward and downward directions. The elevating mechanism 18 includes a fixing base 18A, an elevating actuator 18B attached to the fixing base 18A so that the rod 18B1 extends downward, an adjusting bracket 18C attached to the tip of the rod 18B1 of the elevating actuator 18B, and an adjusting bracket. It is composed of a shutoff valve 18D attached to 18C and a nozzle 19 provided at the lower end of the shutoff valve 18D, which will be described later.

The shutoff valve 18D is attached so that the position can be adjusted upward and downward with respect to the adjustment bracket 18C. As a result, the height position of the nozzle 19 can be appropriately set, so that the oil solution can be injected into other cylinders having different height positions (length dimensions) of the openings. The shutoff valve 18D has a valve seat and a valve body (neither shown) in the middle of the oil-liquid passage communicating with the second pipeline 15. Further, a nozzle mounting pipe 18D1 extending downward is provided below the shutoff valve 18D. A nozzle 19 is attached to the tip (lower end) of the nozzle attachment tube 18D1.

Next, a configuration of the nozzle 19 which is a characteristic part of the present embodiment and a method of manufacturing a hydraulic shock absorber including an oil liquid injection step using the nozzle 19 will be described.

The nozzle 19 injects an oil solution as a working fluid into the piston chamber 7 and the reservoir chamber 8 in the cylinder 2. The nozzle 19 is attached to the lower part of the nozzle mounting tube 18D1 of the shutoff valve 18D. The nozzle 19 includes a mounting cylinder member 20, an insertion cylinder member 21, and a liquid injection port forming member 22, which will be described later.

Here, the nozzle 19 has a virtual axis O1-O1 (see FIG. 3) coaxial with the nozzle mounting tube 18D1. Further, the outer diameter dimension of the nozzle 19 is set to be slightly smaller than the inner diameter dimension of the inner cylinder 3 constituting the cylinder 2. As a result, the nozzle 19 can position the inner cylinder 3 (cylinder 2) at the regular liquid injection position by being inserted into the inner cylinder 3. By preparing a plurality of types of nozzles having different outer diameter dimensions, it is possible to inject oil liquid while positioning the nozzles with respect to other cylinders having different inner diameter dimensions.

The mounting cylinder member 20 of the nozzle 19 is formed in a stepped tubular shape from an inner cylinder portion 20A surrounding the nozzle mounting pipe 18D1 and a flange portion 20B having an enlarged diameter at the base end portion (upper end portion) of the inner cylinder portion 20A. Has been done. An internal screw portion 20C screwed to the tip of the nozzle mounting tube 18D1 is formed on the inner peripheral side of the inner cylinder portion 20A, and an internal screw portion 21C of the insertion cylinder member 21 is screwed on the outer peripheral side. The external thread portion 20D is formed.

The insertion cylinder member 21 has a bottom in which the lower side is closed from the outer cylinder portion 21A surrounding the inner cylinder portion 20A of the mounting cylinder member 20 and the bottom portion 21B in which the tip portion (lower end portion) of the outer cylinder portion 21A is closed. It is formed as a cylindrical body of. On the inner peripheral side of the outer cylinder portion 21A, an inner screw portion 21C screwed into the outer screw portion 20D of the mounting cylinder member 20 is formed. The insertion cylinder member 21 has a tapered surface portion 21D whose diameter is reduced toward the tip end by chamfering the periphery of the bottom portion 21B. The tapered surface portion 21D is a guide surface that guides the inner cylinder 3 to a regular liquid injection position by contacting the upper end portion 3A of the inner cylinder 3 when the insertion cylinder member 21 is inserted into the inner cylinder 3. Functions as.

Further, the bottom portion 21B of the insertion cylinder member 21 is provided with a plurality of inclined screw holes 21E extending diagonally so as to be orthogonal to the tapered surface portion 21D. As shown in FIG. 4, four inclined screw holes 21E are provided, for example, at intervals of 90 degrees in the circumferential direction. The inclined screw holes 21E may be provided with one, two, three, or five or more.

As shown in FIG. 3, each inclined screw hole 21E is formed by screwing a liquid injection port forming member 22 described later, and has the same virtual axis O2-O2 as the liquid injection port 22A. The virtual axis O2-O2 is an axis extending in the longitudinal direction of the liquid injection port forming member 22, and the angle α of the nozzle 19 (nozzle mounting pipe 18D1) with respect to the virtual axis O1-O1 is larger than 0 degrees. Specifically, the angle is set to an angle larger than 0 degrees and smaller than 90 degrees, preferably in an angle range of 15 degrees to 75 degrees (more preferably 40 degrees to 50 degrees). One end of each inclined screw hole 21E in the length direction opens to the tapered surface portion 21D of the insertion cylinder member 21, and the other end opens to the upper surface of the bottom portion 21B.

Further, a circular counterbore hole 21F is formed in the tapered surface portion 21D of the insertion cylinder member 21 by recessing the outer peripheral side of each inclined screw hole 21E. The counterbore hole 21F prevents the oil liquid from dripping by maintaining a high surface tension of the oil liquid when the oil liquid remains in the counterbore hole 21F. Further, the counterbore hole 21F can be arranged at a position where the tip end portion of the liquid injection port forming member 22 is retracted from the tapered surface portion 21D. Thereby, when the inner cylinder 3 is guided by the tapered surface portion 21D, it is possible to prevent the tip portion of the liquid injection port forming member 22 from interfering with the inner cylinder 3.

The liquid injection port forming member 22 is provided in each inclined screw hole 21E of the insertion cylinder member 21. The four liquid injection port forming members 22 are composed of a set screw screwed into the inclined screw hole 21E, and the liquid injection port 22A is provided at the position of the virtual axis O2-O2 so as to penetrate in the axial direction. As described above, in the liquid injection port 22A extending along the virtual axis O2-O2, the angle α of the nozzle 19 with respect to the virtual axis O1-O1 is larger than 0 degrees and smaller than 90 degrees, preferably 15 to 75 degrees. It is set in the range of degrees (more preferably 40 to 50 degrees). A hexagonal hole 22B having an enlarged diameter of the liquid injection port 22A is provided on the base end side of the liquid injection port forming member 22. A hexagon wrench is inserted into the hexagonal hole 22B when the liquid injection port forming member 22 is screwed into the inclined screw hole 21E.

When the four liquid injection ports 22A are injected into the cylinder 2, the oil liquid can be radially discharged toward the inner wall surface 3B of the inner cylinder 3 and the inner wall surface 4B of the outer cylinder 4. As a result, the liquid injection port 22A can inject the oil liquid along the inner wall surfaces 3B and 4B. Here, by preparing a plurality of types of the liquid injection port forming member 22 having different inner diameter dimensions (passage areas) of the liquid injection port 22A, the oil liquid is poured into various cylinders having different oil liquid filling amounts and the like. Can be liquid.

The resistance member 23 is provided in the nozzle 19. The resistance member 23 is arranged on the bottom portion 21B in the insertion cylinder member 21. When the supply of the oil liquid to the liquid injection port 22A of each liquid injection port forming member 22 is stopped, the resistance member 23 gives resistance to the oil liquid to make it difficult for the oil liquid to flow to each liquid injection port 22A side. It is a thing. The resistance member 23 is configured as a grid-like (mesh-like) circular plate having a large number of small holes, and is provided so as to cover each liquid injection port 22A from the upstream side.

Here, since the resistance member 23 has a large number of small holes, the surface tension acts on each of the small holes, so that the overall surface tension can be strengthened. As a result, in a state where the discharge of the oil liquid from each liquid injection port 22A is stopped, the flow to each liquid injection port 22A side is blocked by the surface tension of the resistance member 23, and the oil liquid is prevented from dripping. Can be done.

Next, a method of manufacturing a hydraulic shock absorber including a liquid injection step of injecting an oil liquid into the cylinder 2 of the hydraulic shock absorber 1 by using the liquid injection device 11 of the hydraulic shock absorber will be described.

After the inner cylinder 3 is attached to the outer cylinder 4 and the cylinder 2 is assembled, the cylinder 2 is placed vertically on the transport line so that the opening faces upward. As a result, the cylinder 2 before the rod guide 6 is attached is moved to the liquid injection position by the liquid injection device 11 of the hydraulic shock absorber by the transfer line. The step of arranging the cylinder 2 at the liquid injection position can also be arranged manually without using the transfer line.

When the cylinder 2 is arranged at the liquid injection position by the liquid injection device 11 of the hydraulic shock absorber, the process proceeds to the liquid injection step shown in FIG. In this liquid injection step, a nozzle 19 provided with a liquid injection port 22A of each liquid injection port forming member 22 facing the inner wall surface 3B of the inner cylinder 3 forming the cylinder 2 and the inner wall surface 4B of the outer cylinder 4 is used. The oil solution is injected along the inner wall surface 3B of the cylinder 3 and the inner wall surface 4B of the outer cylinder 4.

That is, in the liquid injection step, step 1 is executed as an insertion step in which a part of the nozzle 19 is inserted into the inner cylinder 3. In this step 1, when the cylinder 2 is arranged at the liquid injection position, the rod 18B1 of the elevating actuator 18B constituting the elevating mechanism 18 is extended, and the nozzle 19 is lowered together with the shutoff valve 18D. At this time, the nozzle 19 is lowered to the position where the liquid is injected into the piston chamber 7 in the inner cylinder 3 shown in FIG. 5, specifically, the position where the outer cylinder portion 21A of the insertion cylinder member 21 enters the inner cylinder 3.

Here, when the insertion cylinder member 21 of the nozzle 19 is inserted into the inner cylinder 3, the long cylinder 2 may be slightly tilted. Even in such a case, since the insertion cylinder member 21 is formed with a tapered surface portion 21D whose diameter is reduced downward, the tapered surface portion 21D is brought into contact with the upper end portion 3A of the inner cylinder 3 to be brought into contact with the inner cylinder 3. The inner cylinder 3 can be guided to the regular injection position.

After inserting the insertion cylinder member 21 of the nozzle 19 into the inner cylinder 3, the process proceeds to step 2 as the first liquid injection step. In this step 2, the oil liquid is injected along the inner wall surface 3B of the inner cylinder 3. Specifically, the actuator 14B of the pump mechanism 14 is reduced to allow the oil liquid in the oil storage tank 12 to flow into the pump portion 14A via the first pipe line 13 and the check valve 16. Next, when the amount of oil liquid set by the stopper 14C has flowed into the pump portion 14A, the oil liquid in the pump portion 14A is extended via the second pipeline 15 and the check valve 17 by extending the actuator 14B. Is supplied to the shutoff valve 18D side. As a result, the oil liquid supplied to the shutoff valve 18D is supplied to the nozzle 19 via the nozzle mounting pipe 18D1.

In the nozzle 19, the supplied oil liquid is discharged from the liquid injection port 22A of each liquid injection port forming member 22 toward the piston chamber 7 of the inner cylinder 3. In this case, the oil liquid discharged from each injection port 22A collides with the inner wall surface 3B of the inner cylinder 3. However, in the present embodiment, each liquid injection port 22A opens obliquely toward the inner wall surface 3B of the inner cylinder 3. Therefore, as shown by the alternate long and short dash line (arrow-dashed line A) in FIG. 5, the oil liquid discharged from each injection port 22A collides with the inner wall surface 3B of the inner cylinder 3 at an obtuse angle, so that the oil liquid scatters. While being suppressed, it can flow downward along the inner wall surface 3B of the inner cylinder 3. As a result, the oil liquid can be injected into the piston chamber 7 while suppressing the collision of the oil liquid filled in the piston chamber 7 with the surface (liquid surface).

Next, the process proceeds to step 3, and it is determined whether or not a predetermined amount of oil has been injected into the piston chamber 7, and if it is determined as "NO", the determination in step 3 is repeated. On the other hand, if it is determined as "YES", the process proceeds to step 4 as the second injection step. For example, a timer, a flow meter, an optical sensor, or the like is used for determining the flow rate of the oil liquid in step 3.

In step 4, oil liquid is poured into the reservoir chamber 8 between the inner cylinder 3 and the outer cylinder 4 along the other end side of the inner wall surface 4B including the range extended from the inner cylinder 3 of the outer cylinder 4. It is a liquid. The other end side of the inner wall surface 4B is a range from a position slightly lower than the upper end portion 3A of the inner wall surface 3B to the upper end portion 4A. Therefore, in the present embodiment, the oil liquid discharged from each injection port 22A on the other end side of the inner wall surface 4B does not come into contact with the upper end portion 3A of the inner cylinder 3, and the moving distance of the nozzle 19 is shortened. The oil liquid is injected along the inner wall surface 4B at a position, that is, at a height equivalent to the upper end portion 3A of the inner wall surface 3B.

In step 4, the rod 18B1 of the elevating actuator 18B is reduced, and the nozzle 19 is raised to the position where the liquid is injected into the reservoir chamber 8 shown in FIG. As a result, in step 4, as shown by the alternate long and short dash line (arrow-dashed line B) in FIG. 6, the oil liquid discharged from each injection port 22A is the inner wall surface 4B of the outer cylinder 4 as in step 2. Since it collides with the object at an obtuse angle, it can flow downward along the inner wall surface 4B of the outer cylinder 4 while suppressing scattering. As a result, the oil liquid can be injected into the reservoir chamber 8 while suppressing the collision of the oil liquid filled in the reservoir chamber 8 with the surface (liquid surface). In this step 4, the oil liquid stop step and the oil liquid supply step can be omitted by raising the nozzle 19 without stopping the discharge of the oil liquid from each liquid injection port 22A.

Next, the process proceeds to step 5, it is determined whether or not a predetermined amount of oil has been injected into the reservoir chamber 8, and if it is determined as "NO", the determination in step 5 is repeated. On the other hand, if "YES" is determined, the process proceeds to step 6 to stop the supply of the oil liquid. In step 5 as well, as in step 3 described above, for example, a timer, a flow meter, an optical sensor, or the like is used for determining the flow rate of the oil liquid.

When the supply of the oil liquid is stopped in step 6, the oil liquid remaining in each injection port 22A may drip. On the other hand, the insertion cylinder member 21 of the nozzle 19 is provided with a counterbore hole 21F located on the outer peripheral side of each liquid injection port 22A. As a result, even if the oil liquid remains in each liquid injection port 22A, the surface tension of the oil liquid is maintained high by the counterbore hole 21F, so that the oil liquid can be prevented from dripping.

Then, when the supply of the oil liquid is stopped in step 6, the process proceeds to step 7, the rod 18B1 of the elevating actuator 18B is reduced, and the nozzle 19 is raised to the standby position shown in FIG.

After the oil liquid is injected into the cylinder 2 by the liquid injection step, the process returns to the assembly work, and the piston 9, the piston rod 10, and the rod guide 6 are assembled to the cylinder 2. Thereby, the hydraulic shock absorber 1 can be manufactured. Immediately after the hydraulic shock absorber 1 is manufactured, the damping force measurement (operation test) of the hydraulic shock absorber 1 is performed.

Thus, according to the present embodiment, the nozzle 19 for injecting the oil liquid into the piston chamber 7 and the reservoir chamber 8 in the cylinder 2 is provided. The nozzle 19 has a plurality of, for example, four liquid injection ports 22A. On this, the virtual axis O2-O2 of each injection port 22A has an angle larger than 0 degrees with respect to the virtual axis O1-O1 of the nozzle 19.

Therefore, in the oil liquid injection step, the oil liquid injection is directed toward the inner wall surface 3B of the inner cylinder 3 of the hollow cylinder 2 or the inner wall surface 4B of the outer cylinder 4 at the time of injection. Using the nozzle 19 provided with 22A, the oil liquid can be injected along the inner wall surface 3B of the inner cylinder 3 or the inner wall surface 4B of the outer cylinder 4.

As a result, when the oil liquid is injected into the piston chamber 7 and the reservoir chamber 8, the oil liquid is injected while suppressing the collision of the oil liquid filled in the piston chamber 7 and the reservoir chamber 8 with the surface (liquid level). be able to. As a result, since foaming of the oil liquid in the piston chamber 7 and the reservoir chamber 8 can be suppressed, a predetermined damping force can be obtained in the damping force measurement (operation test) performed immediately after that, and workability and reliability are improved. can do.

Further, in the insertion step (step 1) of the liquid injection step, a part of the nozzle 19 is inserted into the inner cylinder 3 of the cylinder 2. As a result, even if the long cylinder 2 is slightly tilted and deviates from the regular injection position, the inner cylinder 3 (cylinder 2) can be inserted into the inner cylinder 3 by inserting the insertion cylinder member 21 into the inner cylinder 3. It can be placed at the injection position. Moreover, since the insertion cylinder member 21 forming the nozzle 19 is provided with a tapered surface portion 21D whose diameter is reduced toward the lower side, the tapered surface portion 21D is brought into contact with the upper end portion 3A of the inner cylinder 3. The inner cylinder 3 can be guided to the regular injection position.

The cylinder 2 is composed of an inner cylinder 3 and an outer cylinder 4 which is arranged on the outer circumference of the inner cylinder 3 and whose upper end side is extended from the inner cylinder 3. On this, the liquid injection step is performed in the outer cylinder 4 between the first liquid injection step in which the oil liquid is injected along the inner wall surface 3B of the inner cylinder 3 and the inner cylinder 3 and the outer cylinder 4. It has a second liquid injection step in which the oil liquid is injected along the other end side of the inner wall surface 4B including the range extended from the cylinder 3. As a result, the oil liquid can be injected into the piston chamber 7 and the reservoir chamber 8 of the hydraulic shock absorber 1 provided with the double-cylinder cylinder 2.

Further, counterbore holes 21F are formed on the outer peripheral side of the liquid injection port 22A of each liquid injection port forming member 22 provided in the nozzle 19. Therefore, even if the oil liquid remains in each liquid injection port 22A, the surface tension of the oil liquid is maintained high by the counterbore hole 21F to prevent the oil liquid from dripping.

Further, the outer diameter dimension of the nozzle 19 is set to be slightly smaller than the inner diameter dimension of the inner cylinder 3 constituting the cylinder 2. Therefore, when the nozzle 19 is inserted into the inner cylinder 3, the opening on the upper end 3A side of the inner cylinder 3 is closed by the nozzle 19 to the extent that the oil liquid does not flow out to the reservoir chamber 8. There is no risk of oil dripping on the chamber 8 side, and a predetermined amount of oil can be injected into the inner cylinder 3.

In the embodiment, the insertion cylinder member 21 forming the nozzle 19 is provided with an inclined screw hole 21E, and the liquid injection port forming member 22 having the liquid injection port 22A is screwed into the inclined screw hole 21E. An example shows a case where the liquid port 22A is formed toward the inner wall surface 3B of the inner cylinder 3 or the inner wall surface 4B of the outer cylinder 4. However, the present invention is not limited to this, and for example, the nozzle is formed by a straw-shaped tube body, and the tip of the tube body is formed toward the inner wall surface 3B of the inner cylinder 3 or the inner wall surface 4B of the outer cylinder 4. May be. Further, the liquid injection port may be formed directly on the insertion cylinder member.

In the embodiment, the nozzle 19 is provided with a liquid injection port forming member 22 having a liquid injection port 22A, and the nozzle 19 is moved upward and downward to inject oil into the piston chamber 7 and the reservoir chamber 8. It is configured to be. However, the present invention is not limited to this, and for example, the nozzle may be provided with a liquid injection port for a piston chamber and a liquid injection port for a reservoir chamber. In this case, the liquid can be injected into both the piston chamber and the reservoir chamber without moving the nozzle during the injection of the oil liquid.

In the embodiment, each injection port 22A provided in the nozzle 19 exemplifies a case where the virtual axis O2-O2 is set in the range of, for example, 40 to 50 degrees with respect to the virtual axis O1-O1 of the nozzle 19. doing. However, the present invention is not limited to this, and for example, each liquid injection port provided in the nozzle may be provided so as to be perpendicular to the inner wall surface of the cylinder. In this case, it is desirable that the flow rate of the oil liquid discharged from the liquid injection port is such that the flow rate of the oil liquid does not bounce after colliding with the inner wall surface of the cylinder.

In the embodiment, a case where the oil liquid is radially discharged from the four liquid injection ports 22A is illustrated. However, the present invention is not limited to this, and for example, the oil liquid may be discharged in a swirl shape by tilting (twisting) the liquid injection port in the circumferential direction. In other words, the liquid injection port may be configured so that the oil liquid discharged from the liquid injection port is along the inner wall surface of the cylinder. Further, the liquid injection port may be provided with one, two, three or five or more.

In the embodiment, in step 4, the case where the nozzle 19 is raised without stopping the discharge of the oil liquid from each injection port 22A is illustrated. However, the present invention is not limited to this, and an oil liquid supply stop step may be added between steps 3 and 4, and an oil liquid supply step may be added between steps 4 and 5. ..

Further, in the embodiment, the case where the oil liquid is injected from the liquid injection device 11 of the hydraulic shock absorber into the cylinder 2 having the double cylinder structure from the inner cylinder 3 and the outer cylinder 4 is illustrated. However, the present invention is not limited to this, and a configuration in which a liquid injection device of a hydraulic shock absorber is used to inject oil liquid into a cylinder having a triple cylinder structure or a single cylinder structure may be used.

Further, in the embodiment, the nozzle 19 is moved (up and down) upward and downward as an example, but the nozzle side may be fixed and the hydraulic shock absorber may be moved up and down. Further, both the nozzle and the hydraulic shock absorber may be moved according to the injection step of the cylinder and the nozzle. In other words, the virtual axis O1-O1 is also the relative moving direction between the nozzle and the hydraulic shock absorber.

As a method for manufacturing a fluid pressure shock absorber based on the above-described embodiment and a liquid injection device thereof, for example, those having the following aspects can be considered.

The first aspect of the method for manufacturing a fluid pressure shock absorber is a method for manufacturing a fluid pressure shock absorber in which a working fluid is sealed, and the fluid pressure shock absorber has a hollow cylindrical shape having a bottom on one end side. A cylinder is provided, and a piston rod is projected from the other end side of the cylinder. In the manufacturing method, a nozzle having a fluid injection port facing the inner wall surface of the cylinder is used on the inner wall surface of the cylinder. It is to have a liquid injection step to inject the working fluid along the line. As a result, the working fluid can be injected while suppressing the collision of the working fluid filled in the cylinder with the surface (liquid level), and the bubbling of the working fluid in the cylinder can be suppressed.

The second aspect of the method for manufacturing a fluid pressure shock absorber is the method for manufacturing a fluid pressure shock absorber according to the first aspect, and in the liquid injection step, a part of the nozzle is inside the cylinder. To have an insertion step to be inserted. As a result, the cylinder can be arranged at the regular injection position even if the long cylinder is slightly tilted and deviates from the regular injection position.

A third aspect of the method for manufacturing a fluid pressure shock absorber is the method for manufacturing a fluid pressure shock absorber according to the first or second aspect, wherein the cylinder is arranged on an inner cylinder and an outer periphery of the inner cylinder. The other end side is composed of an outer cylinder extending from the inner cylinder, and the liquid injection step includes a first liquid injection step in which the working fluid is injected along the inner wall surface of the inner cylinder, and the inner cylinder. A second injection step of injecting the working fluid between the cylinder and the outer cylinder along the other end side of the inner wall surface including a range extended from the inner cylinder of the outer cylinder. To have. As a result, a predetermined amount of working fluid can be injected into the fluid pressure shock absorber provided with the double-cylinder type cylinder in the inner cylinder of the cylinder and between the inner cylinder and the outer cylinder. it can.

Further, as the first aspect of the fluid pressure shock absorber liquid injection device, there is a fluid pressure shock absorber liquid injection device in which a working fluid is sealed.
The fluid pressure shock absorber includes a cylinder having a bottom on one end side, and a piston rod projects from the other end side of the cylinder.
The liquid injection device includes a nozzle for injecting a working fluid into the cylinder, and the nozzle has one or a plurality of liquid injection ports, and the virtual axis of the liquid injection port is relative to the virtual axis of the nozzle. It is characterized by having an angle larger than 0 degrees. As a result, the working fluid can be injected while suppressing the collision of the working fluid filled in the cylinder with the surface (liquid level), and the bubbling of the working fluid in the cylinder can be suppressed.

The second aspect of the fluid pressure shock absorber liquid injection device is the fluid pressure shock absorber liquid injection device according to the first aspect, and a counterbore hole is provided on the outer peripheral side of the liquid injection port of the nozzle. Is characterized by being formed. As a result, the surface tension of the working fluid is maintained high by the counterbore holes, so that the working fluid can be prevented from dripping.

The third aspect of the fluid pressure shock absorber liquid injection device is the fluid pressure shock absorber liquid injection device according to the first or second aspect, in which the outer diameter dimension of the nozzle is the inner diameter of the cylinder. A fluid pressure shock absorber injection device characterized by being slightly smaller than its dimensions. As a result, it is possible to prevent the working fluid injected into the cylinder from flowing out of the cylinder.

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 under Japanese Patent Application No. 2018-102434 filed May 29, 2018. The entire disclosure, including the specification, claims, drawings, and abstract of Japanese Patent Application No. 2018-102434 filed May 29, 2018, is incorporated herein by reference in its entirety.

1 Hydraulic shock absorber (fluid pressure shock absorber) 2 Cylinder 3 Inner cylinder 3B, 4B Inner wall surface 4 Outer cylinder 5 Bottom cap (bottom) 10 Piston rod 11 Hydraulic shock absorber liquid injection device (fluid pressure shock absorber liquid injection device) 19 Nozzle 21 Insertion cylinder member 21E Inclined screw hole 21F Counterbore hole 22 Injectable port forming member 22A Injectable port O1-O1 Nozzle virtual axis O2-O2 Injectable virtual axis α Nozzle virtual axis Axial angle

The method for manufacturing a fluid pressure shock absorber according to an embodiment of the present invention is a method for manufacturing a fluid pressure shock absorber in which a working fluid is sealed, and the fluid pressure shock absorber has a hollow cylinder shape having a bottom on one end side. The cylinder has an inner cylinder and an outer cylinder arranged on the outer periphery of the inner cylinder and having an outer cylinder whose other end is extended from the inner cylinder, and a piston is provided from the other end side of the cylinder. The rod is projected, and in the manufacturing method, a part of a nozzle having a fluid injection port facing the inner wall surface of the cylinder is inserted into the inner cylinder and the inner cylinder is arranged at a predetermined position. having an insertion step, by using the nozzle, and a liquid pouring step of pouring the working fluid along a inner wall surface of the cylinder.

Further, the fluid pressure shock absorber liquid injection device according to the embodiment of the present invention is a fluid pressure shock absorber liquid injection device in which a working fluid is sealed, and the fluid pressure shock absorber has a bottom on one end side. The cylinder has an inner cylinder and an outer cylinder arranged on the outer periphery of the inner cylinder and having an outer cylinder whose other end is extended from the inner cylinder, and a piston is provided from the other end side of the cylinder. The rod is projected, and the liquid injection device has a nozzle that injects a working fluid into the cylinder and a part of the fluid is inserted into the inner cylinder to arrange the inner cylinder in a predetermined position, and the nozzle. to enter into the fluid pressure shock absorber in a and a moving device for relatively moving the fluid pressure shock absorber and said nozzle, said nozzle has one or more liquid inlet, infusion liquid inlet The virtual axis extending in the flow direction of the working fluid through the opening surface of the above is the relative movement direction between the nozzle and the fluid pressure shock absorber, and is from 0 degrees with respect to the virtual axis extending in the axial direction of the cylinder. It is characterized by having a large angle.

Claims (6)

It is a method of manufacturing a fluid pressure shock absorber in which a working fluid is sealed.
The fluid pressure shock absorber includes a hollow cylindrical cylinder having a bottom on one end side, and a piston rod projects from the other end side of the cylinder.
The manufacturing method is
A method for manufacturing a fluid pressure shock absorber having a liquid injection step of injecting a working fluid along the inner wall surface of the cylinder by using a nozzle provided with a liquid injection port facing the inner wall surface of the cylinder. The method for manufacturing a fluid pressure shock absorber according to claim 1.
The liquid injection step is a method for manufacturing a fluid pressure shock absorber having an insertion step in which a part of the nozzle is inserted into the cylinder. The method for manufacturing a fluid pressure shock absorber according to claim 1 or 2.
The cylinder is composed of an inner cylinder and an outer cylinder which is arranged on the outer circumference of the inner cylinder and whose other end side is extended from the inner cylinder.
The liquid injection step includes a first liquid injection step in which the working fluid is injected along the inner wall surface of the inner cylinder.
A second liquid injection step of injecting the working fluid between the inner cylinder and the outer cylinder along the other end side of the inner wall surface including a range extended from the inner cylinder of the outer cylinder. A method for manufacturing a fluid pressure shock absorber having. It is a liquid injection device of a fluid pressure shock absorber with a working fluid sealed inside.
The fluid pressure shock absorber includes a cylinder having a bottom on one end side, and a piston rod projects from the other end side of the cylinder.
The liquid injection device
A nozzle that injects working fluid into the cylinder,
A moving device for moving the nozzle and the fluid pressure shock absorber relative to each other in order to allow the nozzle to enter the fluid pressure shock absorber is provided.
The nozzle has one or more injection ports and
The virtual axis extending in the flow direction of the working fluid through the opening surface of the liquid injection port is the relative movement direction between the nozzle and the fluid pressure shock absorber, with respect to the virtual axis extending in the axial direction of the cylinder. A fluid pressure shock absorber injection device characterized by having an angle greater than 0 degrees. The liquid injection device for the fluid pressure shock absorber according to claim 4.
A fluid pressure shock absorber liquid injection device characterized in that a counterbore hole is formed on the outer peripheral side of the liquid injection port of the nozzle. The fluid pressure shock absorber according to claim 4 or 5.
A liquid injection device for a fluid pressure shock absorber, wherein the outer diameter dimension of the nozzle is slightly smaller than the inner diameter dimension of the cylinder.

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