JP7053289B2 - Pressure test equipment and pressure test method - Google Patents

Description

The present invention relates to a pressure test device and a pressure test method for applying a fluid pressure dedicated to the shock absorber to a test object such as a shock absorber component, for example.

For example, in the conventional shock absorber valve operation test, a dedicated absorber oil adjusted to a constant pressure is applied from one direction and the other direction (the direction corresponding to the extension and compression directions of the shock absorber) of the valve. It is designed to judge the quality of valve operation.

However, since the dedicated oil actually used as the test fluid is used, there is a possibility that the valve will be contaminated with the oil after the test and the workability will be deteriorated.

Therefore, for example, in the pressure test apparatus described in Patent Document 1 below, a cleaning agent having volatile properties adjusted to a predetermined pressure is used as a test fluid in the valve of the shock absorber, and the shock absorber is compressed or stretched. It tests the operation of the valve corresponding to the direction.

As described above, by using a volatile cleaning liquid as the test fluid, it is possible to prevent foreign matter from adhering or remaining inside the valve or the like without performing a cleaning treatment.

Jitsukaisho 63-113934

However, since the conventional pressure test apparatus described in Patent Document 1 uses a volatile cleaning agent as a test fluid, the flow resistance due to the viscosity is significantly different from that of regular oil. are doing. Therefore, proper test evaluation of valve operation may not be obtained.

Moreover, since the shock absorber itself as a product is used to test the valve alone, the shock absorber must be disassembled and the valve taken out each time after the test is completed. As a result, the test work becomes complicated and the work efficiency is lowered.

The present invention has been devised in view of the above-mentioned conventional technical problems, and provides a pressure test apparatus and a pressure test method capable of obtaining appropriate test results of a test object and improving test work efficiency. The purpose is to do.

The invention according to claim 1 is a pressure test apparatus for performing a pressure resistance test of a base valve of a shock absorber of a vehicle .
A holding mechanism for holding the base valve and
A cylinder mechanism that applies fluid pressure to the base valve via the holding mechanism, and
The vibration mechanism that operates the cylinder mechanism and
Equipped with
The holding mechanism is composed of a jig dedicated to test evaluation that holds the base valve detachably.
The cylinder mechanism is characterized in that the base valve applies fluid pressure to the base valve using a dedicated fluid used during normal operation.

The invention according to claim 2 has a fluid supply passage for supplying a fluid pressure from the cylinder mechanism to the holding mechanism, a return passage for returning the fluid discharged from the holding mechanism to the cylinder mechanism, and the fluid supply passage. A branch passage formed by branching from, and whose downstream end is connected to the return passage,
A pressure detector provided in the branch passage to measure the fluid pressure applied to the test object and a pressure detector arranged on the downstream side of the pressure detector in the branch passage, the fluid pressure in the branch passage is equal to or higher than a predetermined value. It is characterized by being provided with a relief valve for relieving the fluid when the pressure is reached, and a reservoir tank provided in the return passage for storing the fluid returned from the holding mechanism.

According to the third aspect of the present invention , the holding mechanism is formed in a substantially bottomed cylindrical shape, and is connected to a substrate to which the upstream end of the return passage is connected.
A holding portion that is formed in a substantially covered cylinder shape and is screwed inward from the open end of the substrate and connected to the downstream end of the fluid supply passage.
Equipped with
The substrate has a female threaded portion formed on the inner peripheral surface on the open end side of the peripheral wall integrally provided on the outer periphery of the bottom wall, and a connection hole to which the upstream end of the return passage is connected is formed through the bottom wall. On the other hand
The holding portion has a male screw portion that is detachably screwed to the female screw portion on the outer periphery of the peripheral wall integrally provided on the outer periphery of the lid wall, and the downstream end of the fluid supply passage is connected to the lid wall. The second connection hole is formed through,
A fixing bolt is screwed into the female screw hole formed substantially in the center of the lid wall, and between the head of the fixing bolt and the positioning spacer fitted in the shaft portion of the fixing bolt. The spring member and the spring holding plate are fixed by interposition.
The spring member has an outer peripheral portion that comes into contact with the open end edge of the holding portion by its own spring return force, and closes a storage chamber inside the holding portion that communicates with the second connection hole. It is characterized in that it is detachably held from the holding portion by a fixing bolt.

According to the first aspect of the present application, an appropriate test result of the base valve can be obtained and the test work efficiency can be improved.

It is a schematic diagram which shows one Embodiment of the pressure test apparatus which concerns on this invention. It is an exploded view which shows the cross-sectional view of each component of the holding jig provided in this embodiment. It is a vertical sectional view which shows the state which assembled the holding jig provided to this embodiment. It is a perspective view which shows by cutting a part of the holding jig provided in this embodiment. It is sectional drawing which shows the base valve which is a test object in this embodiment.

Hereinafter, an embodiment of the pressure test apparatus and the pressure test method according to the present invention will be described with reference to the drawings.

FIG. 1 is a schematic view showing an embodiment of a pressure test apparatus according to the present invention.

The pressure test device targets the base valve 22 used in the double-cylinder shock absorber as an example of the test object. Then, this pressure test device applies oil pressure, which is a fluid pressure, to the base valve 22 via a holding jig 1 which is a holding mechanism for holding the base valve 22 internally and detachably, and the holding jig 1. It includes a hydraulic cylinder 2 which is a cylinder mechanism, and a vibration mechanism 3 for operating the hydraulic cylinder 2.

The hydraulic circuit 4 that hydraulically acts on the base valve 22 in the holding jig 1 by the hydraulic cylinder 2 is a supply / discharge passage 5 which is a fluid supply passage for supplying / discharging oil pressure from the hydraulic cylinder 2 to the holding jig 1. A return passage 6 for returning the oil discharged from the holding jig 1 to the hydraulic cylinder 2, and a branch passage 7 formed by branching from the supply / discharge passage 5 and having a downstream end connected to the return passage 6. , A pressure gauge 8 which is a pressure detector for measuring the oil pressure applied to the base valve 22 provided in the branch passage 7, and is arranged on the downstream side of the pressure gauge 8 of the branch passage 7 in the branch passage 7. It is provided with a relief valve 9 for relieving oil when the oil pressure exceeds a predetermined value, and a reservoir tank 10 provided on the downstream side of the return passage 6 for storing the oil returned from the holding jig 1. ing.

Further, on the downstream side of the reservoir tank 10 of the return passage 6, a check valve 11 for restricting the backflow of oil from the hydraulic cylinder 2 side to the reservoir tank 10 side is provided.

The vibration mechanism 3 is a general one, and the piston rod of the vibration generator is stroked by a hydraulic or electric motor to operate the hydraulic cylinder 2. Further, the driving of the vibration mechanism 3 is controlled by controlling the stroke or the rotation speed by the control signal (control current) output from the control unit 14.

The control unit 14 is programmed with a stroke, speed, pressure, and the like in advance, and at the same time as the start of this program, the electric motor is driven and controlled according to an operation determined by a parameter.

In the hydraulic cylinder 2, a piston rod 2b is provided inside the cylinder portion 2a so as to be expandable and contractible, and a piston 2c that slides in the cylinder portion 2a is provided at the tip of the piston rod 2b.

The piston 2c is housed so as to be able to move forward and backward while separating the inside of the cylinder portion 2a into the first hydraulic chamber 2d and the second hydraulic chamber 2e, and also has a port (not shown) inside and a valve body that opens and closes this port. Is provided. Further, another second reservoir tank 12 communicates with the second hydraulic chamber 2e via a communication passage 13. The second reservoir tank 12 is filled with regular oil O dedicated to the shock absorber as a product, and the regular oil O is supplied and discharged from the communication passage 13 into the second hydraulic chamber 2e. It has become. The oil in the second hydraulic chamber 2e is supplied to and discharged from the first hydraulic chamber 2d via the port of the piston 2c as the piston 2c moves to the left in the figure.

That is, when the piston rod 2b strokes in the compression direction (moves in the right direction in the figure), the oil O in the first hydraulic chamber 2d pressurized by the piston 2c enters the holding jig 1 via the supply / discharge passage 5. It is designed to be supplied to. On the other hand, when the piston rod 2b strokes in the extension direction (movement in the left direction in the figure), the first hydraulic chamber 2d becomes a negative pressure as the piston 2c moves in the same direction. Therefore, a part of the oil O in the holding jig 1 and the supply / discharge passage 5 is returned to the first hydraulic pressure chamber 2d.

Further, when the piston 2c moves to the right in the figure, oil O is supplied from the reservoir tank 12 into the second hydraulic chamber 2e, and when the piston 2c moves to the left, a valve is passed through the port. The body is opened so that the oil O can be replaced and flowed from the second hydraulic chamber 2e to the first hydraulic chamber 2d.

FIG. 2 is an exploded view showing a cross section of each component of the holding jig 1, FIG. 3 is a vertical cross-sectional view showing a state in which each component of the holding jig 1 is assembled, and FIG. 4 is one of the holding jig 1. A perspective view showing a cut portion, and FIG. 5 is a cross-sectional view showing a base valve held by the holding jig 1.

As shown in FIGS. 2 to 4, the holding jig 1 is formed in a substantially bottomed cylindrical shape, and is formed in a substantially covered cylindrical shape with a base 20 to which the upstream end of the return passage 6 is connected. It is provided with a holding portion 21 which is screwed and fixed to 20 and to which one end portion 5a of the supply / discharge passage 5 is connected.
The substrate 20 is formed by being surrounded by a relatively thick disk-shaped bottom wall 20a, a cylindrical peripheral wall 20b rising upward from the outer peripheral portion of the bottom wall 20a, and the bottom wall 20a and the peripheral wall 20b. It has a columnar oil chamber 20c and.

In the bottom wall 20a, a connection hole 20d to which the upstream end 6a of the return passage 6 is connected is formed through the bottom wall 20a at a substantially central position along the vertical direction in FIG.

The peripheral wall 20b has a tapered female thread portion 20f formed on the inner peripheral surface, that is, the inner peripheral surface of the inner upper opening end 20e. In the present embodiment, the female threaded portion 20f is formed from substantially the center to the upper side of the peripheral wall 20b in the vertical direction, but it can also be formed on the entire inner peripheral surface.

The substrate 20 is stably and surely supported by a support device (not shown).

The holding portion 21 is arranged coaxially with the substrate 20, and is projected downward from a relatively thick disk-shaped upper wall 21a which is a lid wall and an outer peripheral portion of the upper wall 21a. It has a cylindrical wall 21b and an inverted concave storage chamber 21c formed by being surrounded by the upper wall 21a and the cylindrical wall 21b.

The upper wall 21a has a female screw hole 21d formed through the female screw hole 21d at a substantially central position along the vertical direction in the drawing, and a second end portion 5a of the supply / discharge passage 5 is connected to the side portion of the female screw hole 21d. The connection hole 21f is also formed through in the vertical direction.

The inner peripheral surface of the second connection hole 21f is formed in a stepped shape so that the upper portion on the opposite side of the accommodation chamber 21c is directly connected to one end portion 5a of the supply / discharge passage 5. A small diameter portion 21g at the lower portion thereof is formed to face the storage chamber 21c.

The cylindrical wall 21b has a semicircular passage groove 21h formed in the inner peripheral surface on the accommodation chamber 21c side along the inner peripheral surface of the small diameter portion 21g.

Further, the cylindrical wall 21b is formed with a tapered male threaded portion 21i that is screwed onto the female threaded portion 20f of the substrate 20 from substantially the center in the axial direction of the outer peripheral surface to the lower side.

The axial length of the male threaded portion 21i (the axial length of the cylindrical wall 21b) determines the screwing width of the substrate 20 with the female threaded portion 20f. That is, since the screwing amount of the female and female screw portions 20f and 21i determines the volume of the oil chamber 20c of the substrate 20, it is set to a size sufficient to secure this required volume.

Between the base 20 and the holding portion 21, a base valve 22 as a spring member to be tested, a spacer 23 for positioning the base valve 22, and a spring holding plate supporting the lower portion of the base valve 22 are provided. A retainer 24, a base valve 22, a spacer 23, and a fixing bolt 25 for fixing the retainer 24 to the holding portion 21 are provided.

As shown in FIG. 5, the base valve 22 has a thin disk-shaped spring portion 22a made of spring steel and an annular seal portion 22b vulcanized and adhered to the upper surface of the outer peripheral portion of the spring portion 22a. Have.

As shown in FIG. 5, the spring portion 22a is formed so that the outer diameter D of the outer peripheral portion 22c is slightly larger than the lower inner diameter of the accommodation chamber 21c. Further, the spring portion 22a is formed through a bolt insertion hole 22d into which the shaft portion 25b of the fixing bolt 25 described later is inserted at a substantially central position.

Further, the spring portion 22a is arranged so as to cover the entire lower portion of the storage chamber 21c in a state of being fixed to the holding portion 21 by the fixing bolt 25 via the spacer 23 and the retainer 24. Further, at this time, the outer peripheral portion 22a of the spring portion 22a is in contact with the lower hole edge of the accommodation chamber 21c by its own elastic return force to close the accommodation chamber 21c.

The seal portion 22b is formed in an annular shape by, for example, a synthetic rubber material, and as shown in FIG. 5, the upper surface 22e is gradually formed in a downwardly inclined shape from the outer peripheral portion 22f to the inner peripheral portion 22g. Further, the outer diameter of the seal portion 22b is formed to be slightly smaller than the inner diameter of the accommodation chamber 21c. Therefore, as shown in FIG. 3, when the seal portion 22b is fixed to the holding portion 21 by the fixing bolt 25 via the spacer 23, the outer peripheral surface is liquidtightly attached to the lower inner peripheral surface of the accommodation chamber 21c. It is designed to contact and seal the inside of the accommodation chamber 21c.

As shown in FIGS. 2 and 3, the spacer 23 is formed in a substantially cylindrical shape by a metal material, and an insertion hole 23a into which the shaft portion 25b of the fixing bolt 25 is inserted is formed through the spacer 23. Further, the axial length L of the spacer 23 is the lower opening of the spring portion 22a of the base valve 22 and the accommodation chamber 21c of the holding portion 21 when the base valve 22 is fixed to the holding portion 21 by the fixing bolt 25. The length is set to position the space between them in an appropriate position. That is, the axial length L of the spacer 23 determines the relative position of the spring portion 22a and the seal portion 22b with respect to the accommodation chamber 21c.

The retainer 24 is formed of a metal material in a relatively thick disk shape to ensure rigidity, and an insertion hole 24a into which the shaft portion 25b of the fixing bolt 25 is inserted is formed through the retainer 24 at a substantially central position. There is. Further, the retainer 24 is integrally provided with an annular protrusion 24c on the outer peripheral side of the upper surface 24b, and the presence of the protrusion 24c forms an annular recess 24d on the outer peripheral portion of the upper surface 24b.

Then, in a state where the retainer 24 is fixed to the holding portion 21 together with the base valve 22 by the fixing bolt 25, as shown in FIG. 3, the outer peripheral portion 22c of the spring portion 22a of the base valve 22 is an annular portion of the retainer 24. It is arranged so as to cover the recess 24d. Further, the annular recess 24d of the retainer 24 is a view in which the outer peripheral portion 22c of the spring portion 22a uses the protrusion 24c as a fulcrum when hydraulic pressure is applied to the upper surface (upper surface of the spring portion 22a) of the base valve 22 from the accommodating chamber 21c. It is designed to allow bending deformation in the middle and lower directions.

The fixing bolt 25 is a general one, and has a head portion 25a in which a cross groove into which the tip of a driver tool can be fitted is formed on an outer surface, and a shaft portion 25b integrally extending from the inner end surface of the head portion 25a. have. The shaft portion 25b has a male screw 25c screwed into the female screw hole 21d of the holding portion 21 on the outer periphery of the tip portion. The fixing bolt 25 is adapted to fasten and fix the retainer 24, the base valve 22 and the spacer 23, which are attached via the shaft portion 25b, to the base 20 together by a predetermined axial torque.
[Action and effect of this embodiment]
Hereinafter, the action and effect of this embodiment will be described.

As described above, first, the base valve 22 is attached and fixed in advance to the holding portion 21 together with the spacer 23 and the retainer 24 by the fixing bolt 25. In this state, the holding portion 21 is fastened and fixed to the substrate 20 by tightening the tapered female and female screw portions 20f and 21i.

Next, an operation test of the base valve 22 is performed. That is, the vibration mechanism 3 is driven by the control signal (control current) output from the control unit 14. As a result, the piston rod 2b of the hydraulic cylinder 2 strokes in the right direction (compression direction) in the figure from the position shown in FIG. 1 to move the piston 2c in the same direction.

Therefore, the pressure inside the first hydraulic chamber 2d becomes high, and the oil O (hydraulic pressure) in the first hydraulic chamber 2d is discharged to the supply / discharge passage 5. The discharged oil O in the supply / discharge passage 5 is supplied into the storage chamber 21c from the second connection hole 21f of the holding jig 1.

The pressure of the oil O supplied into the storage chamber 21c is displayed on the pressure gauge 8, and is controlled to a predetermined pressure preset by the control unit 14. This predetermined pressure is set to, for example, a pressure at which operation or non-operation can be confirmed with reference to the operation start pressure Po at which the base valve 22 starts to open. The predetermined pressure is set to, for example, 5 MPa.

Then, when the pressure of the oil O in the accommodation chamber 21c rises to a predetermined pressure, it acts on the base valve 22, overcomes the spring force of the spring portion 22a of the base valve 22, and the outer peripheral portion 22c is the protrusion 24c of the retainer 24. As a fulcrum, it bends and deforms downward from the position shown in FIG.

As a result, the seal portion 22b is separated from the lower opening end of the accommodation chamber 21c and the seal is released (opened). Therefore, the oil O in the accommodation chamber 21c is the seal portion as shown by the arrow in FIG. It flows into the oil chamber 20c through the outer peripheral portions 22c of the 22b and the spring portion 22a. The oil O in the oil chamber 20c flows into the return passage 6 through the connection hole 20d. The oil O that has flowed into the return passage 6 flows into the reservoir tank 10 and is temporarily stored there.

The oil O discharged from the hydraulic cylinder 2 through the supply / discharge passage 5 to the accommodation chamber 21c is not directly supplied to the reservoir tank 10 by the check valve 11. Further, the hydraulic pressure supplied to the supply / discharge passage 5 is checked by the pressure gauge 8 via the branch passage 7 as described above, but when the hydraulic pressure excessively rises in the branch passage 7, the relief valve is used. It is returned to the return passage 6 while being pressure-adjusted by 9.

Further, when the piston rod 2b of the hydraulic cylinder 2 has an extension stroke, the first hydraulic chamber 2d becomes a negative pressure, so that the oil O in the reservoir tank 10 and the supply / discharge passage 5 is in the first hydraulic chamber 2d. Returned to.

When the test such as the operation of the base valve 22 is completed, the holding portion 21 is loosened and removed from the base 20 via the male and female screw portions 20f and 21i. After that, the fixing bolt 25 is loosened and the base valve 22 is removed from the holding portion 21 together with the spacer 23 and the retainer 24.

The base valve 22 that has obtained a certain evaluation by this test is applied to a shock absorber that is a product, but if a certain evaluation cannot be obtained, the base valve 22 is discarded or adjusted again, and the test is performed again.

As described above, since the regular oil O is used as the test oil O in the present embodiment, the influence on the flow resistance from the storage chamber 21c due to the viscosity is reduced, and the oil O is applied to the shock absorber. Appropriate test evaluation can be obtained in the state of being.

That is, as a durability test under a predetermined pressure load of the base valve 22, the seal portion 22b is broken, broken, or torn, the seal portion 22b is peeled from the spring portion 22a, and the spring portion 22a is cracked. It is possible to accurately evaluate the condition such as cracks and cracks.

Further, since the test of the base valve 22 is not performed inside the shock absorber as a product but by using the holding jig 1 to which the base valve 22 can be attached and detached, the test work becomes extremely easy. The work efficiency can be improved.

Further, since the pressure test device also uses a simple hydraulic circuit, the manufacturing work of the device is easy.

Further, in the holding jig 1, since the base 20 and the holding portion 21 are connected by tapered female and female screw portions 20f and 21i, the sealing performance is exhibited and the oil from the oil chamber 20c and the accommodating chamber 21c to the outside is exhibited. The leak of O is suppressed.

In the present embodiment, the base valve 22 of the shock absorber is used as the test object, but the present invention is not limited to this, and the sealability durability test by a pressure load such as a cup or a piston seal used for a vehicle brake or a clutch is used. It can also be used for. In this case, regular brake fluid or mineral oil is used as the fluid used in the test.

Further, as another test object, it can be applied to a sealing component such as an O-ring generally used for machinery, and can be used for a sealing durability test by a pressure load thereof. As the fluid used in this case, ordinary water or regular oil is used.

Further, the structure of the holding jig 1 is not limited to that of the above-described embodiment, and can be arbitrarily set according to the above-mentioned test object.

1 ... Holding jig (holding mechanism), 2 ... Hydraulic cylinder (cylinder mechanism), 2a ... Cylinder part, 2b ... Piston rod, 2c ... Piston, 3 ... Vibration mechanism, 4 ... Hydraulic circuit, 5 ... Supply / discharge passage ( Fluid supply passage), 5a ... One end, 6 ... Return passage, 7 ... Branch passage, 8 ... Pressure detector (pressure gauge), 9 ... Relief valve, 10 ... Reservoir tank, 11 ... Check valve, 12 ... Second Reservoir tank, 14 ... Control unit, 20 ... Base, 20a ... Bottom wall, 20b ... Circumferential wall, 20c ... Oil chamber, 20d ... Connection hole, 20e ... Open end, 21 ... Holding part, 21a ... Upper wall, 21b ... Cylindrical wall , 21c ... Containment chamber, 21d ... Female screw hole, 21f ... Second connection hole, 22 ... Base valve (test object), 22a ... Spring part, 22b ... Seal part, 22d ... Insert hole, 23 ... Spacer, 23a ... Insertion Holes, 24 ... retainers, 25 ... fixing bolts, 25b ... shafts, 25c ... male threads.

Claims (4)

A pressure test device that tests the pressure resistance of the base valve of a vehicle shock absorber .
A holding mechanism for holding the base valve and
A cylinder mechanism that applies fluid pressure to the base valve via the holding mechanism, and
The vibration mechanism that operates the cylinder mechanism and
Equipped with
The holding mechanism is composed of a jig dedicated to test evaluation that holds the base valve detachably.
The cylinder mechanism is a pressure test device, characterized in that a fluid pressure is applied to the base valve using a dedicated fluid that is used when the base valve operates normally. The pressure test apparatus according to claim 1.
A fluid supply passage that supplies fluid pressure from the cylinder mechanism to the holding mechanism,
A return passage for returning the fluid discharged from the holding mechanism to the cylinder mechanism, and
A branch passage formed by branching from the fluid supply passage and having a downstream end connected to the return passage,
A pressure detector provided in the branch passage to measure the fluid pressure applied to the test object, and a pressure detector.
A relief valve arranged on the downstream side of the pressure detector in the branch passage and relieving the fluid when the fluid pressure in the branch passage exceeds a predetermined value.
A reservoir tank provided in the return passage and storing the fluid returned from the holding mechanism,
A pressure test device characterized by being equipped with . The pressure test apparatus according to claim 2 .
The holding mechanism is formed in a substantially bottomed cylindrical shape, and is connected to a substrate to which the upstream end of the return passage is connected.
A holding portion that is formed in a substantially covered cylinder shape and is screwed inward from the open end of the substrate and connected to the downstream end of the fluid supply passage.
Equipped with
The substrate has a female threaded portion formed on the inner peripheral surface on the open end side of the peripheral wall integrally provided on the outer periphery of the bottom wall, and a connection hole to which the upstream end of the return passage is connected is formed through the bottom wall. On the other hand
The holding portion has a male screw portion that is detachably screwed to the female screw portion on the outer periphery of the peripheral wall integrally provided on the outer periphery of the lid wall, and the downstream end of the fluid supply passage is connected to the lid wall. The second connection hole is formed through,
A fixing bolt is screwed into the female screw hole formed substantially in the center of the lid wall, and between the head of the fixing bolt and the positioning spacer fitted in the shaft portion of the fixing bolt. The spring member and the spring holding plate are fixed by interposition.
The spring member has an outer peripheral portion that comes into contact with the open end edge of the holding portion by its own spring return force, and closes a storage chamber inside the holding portion that communicates with the second connection hole. A pressure test device characterized in that it is detachably held from the holding portion by a fixing bolt . A pressure test method for performing a pressure resistance test of a base valve of a shock absorber of a vehicle using the pressure test device according to claim 1 .
The cylinder mechanism is operated by the vibration mechanism, and the base valve is detachably held inside the holding mechanism by the cylinder mechanism using a dedicated fluid used during normal operation of the base valve . A pressure test method characterized by applying fluid pressure.

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