JP6561005B2 - Cylinder device inspection device and inspection method - Google Patents

Description

  The present invention relates to a cylinder device inspection apparatus and inspection method.

  A pickup that detects vibration acceleration is attached to a predetermined part of the engine to detect abnormal noise of the engine (see, for example, Patent Document 1).

JP-A-2-38837

  If it is necessary to attach a pickup to a part to be inspected, the inspection becomes complicated.

  Therefore, an object of the present invention is to provide an inspection device and an inspection method for a cylinder device that can facilitate the inspection.

  In order to achieve the above object, an inspection apparatus of the present invention is an inspection apparatus for a cylinder device having a cylinder made of a magnetic material and a piston that slides in the cylinder, in a non-contact manner in the vicinity of the cylinder. An electromagnetic pickup that is disposed and electrically detects vibration generated when the piston slides relative to the cylinder by electromagnetic induction, and a determination that determines whether or not the cylinder device is abnormal based on the vibration detected by the electromagnetic pickup And a device.

  The inspection method of the present invention is an inspection method for a cylinder device having a cylinder made of a magnetic material and a piston that slides in the cylinder, and is an electromagnetic pickup arranged in a non-contact manner in the vicinity of the cylinder. A detection step of electrically detecting vibration generated when the piston slides with respect to the cylinder by electromagnetic induction, and a determination step of determining whether or not the cylinder device is abnormal based on the vibration detected by the electromagnetic pickup. The configuration included.

  According to the present invention, inspection can be facilitated.

It is sectional drawing which shows the cylinder apparatus test | inspected with the test | inspection apparatus and test | inspection method of one Embodiment concerning this invention. It is a lineblock diagram of the inspection device of one embodiment concerning the present invention. It is a figure showing roughly the electromagnetic pick-up of the inspection device of one embodiment concerning the present invention. It is a graph which shows the detection results (a)-(c) by the test | inspection apparatus of one Embodiment which concerns on this invention, and the detection results (d)-(e) of an audio | voice microphone type test | inspection apparatus.

  An inspection apparatus and inspection method for a cylinder device according to an embodiment of the present invention will be described below with reference to the drawings.

  First, the cylinder apparatus 11 inspected by the inspection apparatus and inspection method of the present embodiment will be described with reference to FIG. A cylinder device 11 shown in FIG. 1 is a shock absorber used for a suspension device of a vehicle such as an automobile or a railway vehicle. The cylinder device 11 includes a cylindrical inner tube 12 in which a working liquid is sealed, and a working liquid and a working gas that are larger in diameter than the inner tube 12 and provided on the outer peripheral side of the inner tube 12. And a bottomed cylindrical outer shell 14 forming the reservoir chamber 13. That is, the cylinder device 11 is a double cylinder type shock absorber in which the outer shell 14 and the inner tube 12 constitute the cylinder 15.

  The outer shell 14 includes a cylindrical side wall portion 17 and a bottom portion 18 that closes one end side of the side wall portion 17 in the axial direction. The inner tube 12 has a cylindrical shape. The inner tube 12 is engaged with the bottom portion 18 of the outer shell 14 via an annular base valve 30 attached to one end portion in the axial direction. The inner tube 12 is engaged with the bottom 18 of the side wall 17 of the outer shell 14 via an annular rod guide 31 attached to the other end in the axial direction.

  The base valve 30 is placed on the bottom portion 18 of the outer shell 14 in a state of being fitted and fixed to the inner tube 12, and at that time, the base valve 30 is positioned in the radial direction. As a result, the base valve 30 is arranged coaxially with the outer shell 14. The rod guide 31 is fitted to the inner tube 12 and the side wall portion 17 of the outer shell 14, so that the other axial end portion of the inner tube 12 is arranged coaxially with the outer shell 14. An annular seal member 33 is disposed on the opposite side of the rod guide 31 from the bottom portion 18, and this seal member 33 is also fitted to the inner peripheral portion of the side wall portion 17. On the side opposite to the bottom 18 of the outer shell 14, a locking portion 34 is formed by being bent radially inward, and the sealing member 33 is locked by the locking portion 34 on the outer side in the axial direction. Has been.

  A piston 35 is slidably fitted in the inner tube 12. The piston 35 defines a first chamber 38 and a second chamber 39 in the inner tube 12. The first chamber 38 is provided between the piston 35 in the inner tube 12 and the rod guide 31, and the second chamber 39 is provided between the piston 35 in the inner tube 12 and the base valve 30. The second chamber 39 in the inner tube 12 is defined as the reservoir chamber 13 by a base valve 30 provided on one end side of the inner tube 12.

  A rod 41 is connected to the piston 35 by a nut 43. The rod 41 extends from the inner tube 12 and the outer shell 14, that is, the cylinder 15 to the outside through the rod guide 31 and the seal member 33. Accordingly, the rod 41 has one end side disposed in the outer shell 14 and the inner tube 12 and the other end side disposed outside the outer shell 14 and the inner tube 12. The rod 41 moves in the axial direction integrally with the piston 35 with respect to the inner tube 12 and the outer shell 14. The seal member 33 closes the space between the outer shell 14 and the rod 41 and restricts the working liquid in the inner tube 12 and the working gas and working liquid in the reservoir chamber 13 from leaking to the outside.

  The piston 35 is formed with a passage 44 and a passage 45 penetrating in the axial direction. The passages 44 and 45 can communicate the first chamber 38 and the second chamber 39. The piston 35 is provided with an annular disk valve 46 that can close the passage 44 by contacting the piston 35 on the side opposite to the bottom 18 in the axial direction. The piston 35 is provided with an annular disk valve 47 on the bottom 18 side in the axial direction that can close the passage 45 by contacting the piston 35.

  In the disc valve 46, the rod 41 moves to the contraction side to increase the amount of entry into the inner tube 12 and the outer shell 14, and the piston 35 moves in a direction to narrow the second chamber 39, so that the pressure in the second chamber 39 is changed to the first chamber. When the pressure is higher than the pressure 38 by a predetermined value or more, the passage 44 is opened, and a damping force is generated at that time. In the disc valve 47, the rod 41 moves to the extending side that increases the amount of protrusion from the inner tube 12 and the outer shell 14, and the piston 35 moves in the direction of narrowing the first chamber 38, so that the pressure in the first chamber 38 becomes the second chamber 39. When the pressure becomes higher than a predetermined value by a predetermined value or more, the passage 45 is opened, and a damping force is generated at that time.

  The base valve 30 is formed with a passage 52 and a passage 53 penetrating in the axial direction. The passages 52 and 53 can communicate the second chamber 39 and the reservoir chamber 13. The base valve 30 is provided with an annular disk valve 55 that can close the passage 52 by contacting the base valve 30 on the side of the bottom 18 in the axial direction, and on the side opposite to the bottom 18 in the axial direction. An annular disk valve 56 that can close the passage 53 by contacting the base valve 30 is disposed.

  The disk valve 55 is a check valve that allows the flow of the working liquid from the second chamber 39 to the reservoir chamber 13 side via the passage 52 and restricts the flow of the working liquid through the passage 52 in the opposite direction. The disc valve 55 opens the passage 52 when the rod 41 moves to the contraction side and the pressure in the second chamber 39 becomes higher than the pressure in the reservoir chamber 13 by a predetermined value or more. It is a valve.

  The disk valve 56 is a check valve that allows the flow of the working liquid from the reservoir chamber 13 to the second chamber 39 side through the passage 53 and restricts the flow of the working liquid through the passage 53 in the opposite direction. The disc valve 56 opens the passage 53 when the rod 41 moves to the extension side, the piston 35 moves to the first chamber 38 side, and the pressure in the second chamber 39 falls below the pressure in the reservoir chamber 13. In this case, the suction valve flows the working liquid from the reservoir chamber 13 into the second chamber 39 without substantially generating a damping force.

  A cylindrical mounting eye 58, a part of which is shown in FIG. 1, is fixed to the outside of the bottom 18 of the outer shell 14 by welding. In the cylinder device 11, a portion outside the seal member 33 of the rod 41 and the attachment eye 58 are attached to a relative movement portion to be attached. The cylinder device 11 changes the volume of the first chamber 38 and the second chamber 39 by causing the piston 35 to slide in the inner tube 12 of the cylinder 15 in the axial direction integrally with the rod 41 by relative movement of the attachment target portion. At that time, a damping force is generated by the flow resistance of the oil generated in the piston 35 and the base valve 30. In the cylinder device 11, for example, the rod 41 is connected to the vehicle body side of the vehicle and the mounting eye 58 is connected to the wheel side of the vehicle to generate a damping force with respect to the movement of the wheel relative to the vehicle body.

  The outer shell 14 constituting the cylinder 15 is made of a magnetic material, specifically made of iron, and more specifically made of steel pipe. The inner tube 12 constituting the cylinder 15 is also made of a magnetic material, specifically made of iron and more specifically made of steel pipe. The rod 41 is also made of a magnetic material, and is specifically made of iron, more specifically made of steel.

  As shown in FIG. 2, the inspection device 60 includes a telescopic drive device 61 that forcibly expands and contracts the cylinder device 11, and an outer shell 14 of the cylinder 15 in the vicinity of the outer shell 14 of the cylinder 15 set in the telescopic drive device 61. On the other hand, the electromagnetic pickup 62 is arranged in a non-contact manner and electrically detects vibration generated in the outer shell 14 by electromagnetic induction action, and determination for determining whether the cylinder device 11 is abnormal based on the vibration detected by the electromagnetic pickup 62 And a device 63.

  The telescopic drive device 61 is engaged with the rod 41 and the mounting eye 58 of the cylinder device 11, and pulls the rod 41 out of the cylinder 15 or pushes it into the cylinder 15 by bringing them close and apart. That is, the expansion / contraction driving device 61 forcibly expands and contracts the cylinder device 11. The expansion / contraction driving device 61 can also be used as an expansion / contraction driving device for a damping force tester that expands / contracts the cylinder device 11 and detects the damping force.

  The electromagnetic pickup 62 is disposed in a non-contact manner with respect to the cylinder device 11 at an outer position in the vicinity of the outer shell 14 of the cylinder device 11 set in the telescopic drive device 61. The electromagnetic pickup 62 electrically detects vibration generated in the cylinder 15 in a non-contact manner by electromagnetic induction when the cylinder device 11 is expanded or contracted by the expansion / contraction driving device 61, that is, when the piston 35 slides on the cylinder 15.

  Here, since the electromagnetic pickup 62 is to electrically detect vibration generated in the cylinder 15 in a non-contact manner by electromagnetic induction, the outer shell 14 of the cylinder 15 to be detected needs to be a magnetic body. The electromagnetic pickup 62 detects only the vibration of the magnetic material within a predetermined distance, does not detect the vibration of the magnetic material farther than the predetermined distance, and does not detect the vibration of the non-magnetic material regardless of the distance. Will not be detected. Specifically, the electromagnetic pickup 62 is a pickup for an electric guitar that detects vibration of a string of the electric guitar. As shown in FIG. 3, the electromagnetic pickup 62 has a permanent magnet 65 and a coil 66 wound around the permanent magnet 65, and a direct current is passed through the coil 66, and both ends of the coil 66 at that time Is a detection signal.

  As shown in FIG. 2, the outer shell 14 of the cylinder 15, which is a magnetic body arranged in the vicinity of the permanent magnet 65 of the electromagnetic pickup 62, is influenced by the permanent magnet 65 by being set in the telescopic drive device 61. It becomes a weak magnet. In this state, when the outer shell 14 of the cylinder 15 vibrates in the vicinity of the coil 66 of the electromagnetic pickup 62, the magnetic field changes according to the vibration, and the voltage value of the coil 66 changes. The electromagnetic pickup 62 electrically detects only the vibration of the magnetic material that affects the generated magnetic field. For this reason, the electromagnetic pickup 62 does not react to a human voice that is vibration other than a magnetic material, equipment noise outside the magnetic field of the coil 66, or the like.

  The determination device 63 determines whether or not the cylinder device 11 is abnormal based on the detection signal detected by the electromagnetic pickup 62, that is, the vibration of the outer shell 14 of the cylinder 15. The determination device 63 converts the detection signal detected by the electromagnetic pickup 62 during expansion / contraction of the cylinder device 11 by the expansion / contraction drive device 61 into a sound pressure level, and when the sound pressure level exceeds a predetermined threshold in a predetermined frequency region. Then, it is determined that abnormal noise has occurred in the cylinder device 11, and it is determined that there is an abnormality in the cylinder device 11. The determination device 63 determines that the sound pressure level of the detection signal detected by the electromagnetic pickup 62 during expansion / contraction of the cylinder device 11 by the expansion / contraction drive device 61 is less than or equal to a predetermined threshold value in a predetermined frequency region. It is determined that there is no abnormal noise and it is determined that there is no abnormality in the cylinder device 11. The determination device 63 includes, for example, an amplifier that amplifies the detection signal of the electromagnetic pickup 62, an FFT analyzer that performs fast Fourier analysis on the detection signal amplified by the amplifier, an analysis device that analyzes the output of the FFT analyzer, and the like. .

  The method of inspecting the cylinder device 11 using the above-described inspection device 60 is to force the cylinder device 11 set on the expansion / contraction drive device 61 to extend and contract to slide the piston 35 against the inner tube 12 of the cylinder 15. At this time, a detection process is performed in which vibration generated in the outer shell 14 of the cylinder 15 is electrically detected by an electromagnetic induction action by the electromagnetic pickup 62 disposed in a non-contact manner in the vicinity of the outer shell 14 of the cylinder 15. And the determination apparatus 63 performs the determination process which determines whether the cylinder apparatus 11 is abnormal based on the vibration which the electromagnetic pick-up 62 detected.

  Here, when the abnormal noise of the cylinder device 11 is inspected by the inspection method using the inspection device 60 of the above-described embodiment, and when the abnormal noise of the cylinder device 11 is inspected by the inspection device that detects the conventional sound with the voice microphone. And compared. The abnormal noise of the cylinder device 11 is mainly an abnormal noise around 3 to 9 Hz such as a key-key sound and a cucumber sound generated when the cylinder device 11 is contracted at high speed.

  4 (a) and 4 (d) show the sound pressure level for each frequency when the same normal cylinder device 11 that does not generate abnormal noise is inspected in the absence of external noise. 4A shows an inspection result inspected by the inspection apparatus 60 of the embodiment, and FIG. 4D shows an inspection result inspected by a conventional voice microphone type inspection apparatus. As described above, both the inspection result when inspected by the inspection apparatus 60 of the embodiment and the inspection result inspected by the conventional voice microphone detection type inspection apparatus have a low sound pressure level and no abnormal noise is generated. Can be detected.

  FIGS. 4B and 4E show sound pressure levels for each frequency when the same abnormal cylinder device 11 that generates abnormal noise is inspected in the absence of external noise. FIG. 4B shows an inspection result inspected by the inspection apparatus 60 of the embodiment, and FIG. 4E shows an inspection result inspected by a conventional voice microphone type inspection apparatus. Thus, both the inspection result when inspected by the inspection device 60 of the embodiment and the inspection result inspected by the conventional voice microphone detection type inspection device are the normal cylinder devices shown in FIGS. The sound pressure level in the abnormal sound generation range indicated by the broken line is higher than that when 11 is inspected. Therefore, if a threshold value of the sound pressure level is set for the frequency of the abnormal sound generation range so that these sound pressure levels can be detected, the sound pressure level will exceed this threshold value and an abnormal sound will be generated. Can be detected.

  4 (c) and 4 (f) show the sound pressure level for each frequency when the same cylinder device 11 that obtained the results of FIGS. 4 (b) and 4 (e) is examined in the presence of external noise. Is shown. FIG. 4C shows an inspection result inspected by the inspection apparatus 60 of the embodiment, and FIG. 4F shows an inspection result inspected by a conventional voice microphone type inspection apparatus. As shown in FIG. 4C, the inspection result when inspected by the inspection device 60 of the embodiment shows that the sound pressure level in the abnormal noise generation range indicated by the broken line is high and abnormal noise is generated. Detection can be performed in substantially the same manner as in the case of no external noise shown in FIG. On the other hand, as shown in FIG. 4 (f), the inspection result inspected by the conventional voice microphone type inspection apparatus is clearly different from the state without external noise shown in FIG. 4 (e). The abnormal sound pressure level in the abnormal sound generation range indicated by the broken line generated by the device 11 is buried in the external noise in the external noise generation range indicated by the two-dot chain line that overlaps the range, making detection difficult.

  In Patent Document 1, a pickup for detecting vibration acceleration is attached to a predetermined part of an engine to detect abnormal noise of the engine. As described above, in the method of attaching the pickup to the inspection target component, an operation of attaching the pickup is necessary, and the inspection becomes complicated. In addition, the pickup is likely to be deteriorated by the attachment and detachment, and the life is shortened. In the method of detecting an abnormal sound from a part to be inspected with an audio microphone, it is not necessary to attach a sensor to the part to be inspected, but the abnormal sound generated by the part to be inspected is buried in external noise and is difficult to detect.

  On the other hand, according to the present embodiment, the electromagnetic pickup 62 that is arranged in a non-contact manner in the vicinity of the cylinder 15 and electrically detects vibration generated when the piston 35 slides with respect to the cylinder 15 by electromagnetic induction action is used. The determination device 63 determines whether or not the cylinder device 11 is abnormal based on the vibration detected by the electromagnetic pickup 62. As described above, since the vibration is detected by the non-contact electromagnetic pickup 62 with respect to the cylinder device 11, it is not necessary to attach the electromagnetic pickup 62 to the cylinder device 11. Therefore, inspection can be facilitated. Further, since the electromagnetic pickup 62 is not in contact with the cylinder device 11, it has a long life. In addition, the electromagnetic pickup 62 detects vibrations of the cylinders 15 arranged close to each other by an electromagnetic induction action, so that the influence of external noise can be suppressed. Therefore, an accurate inspection can be performed.

  In addition, the electromagnetic pickup 62 may be used instead of the voice microphone of the testing apparatus using the conventional voice microphone, and changes to the conventional testing apparatus can be kept small.

  It should be noted that an abnormal noise is generated when the piston 35 slides with respect to the cylinder 15 and this is only required to be a magnetic body as a component detected by the electromagnetic pickup 62. Specifically, if at least the outer shell 14 is a magnetic body. good.

  The inspection device of the above embodiment is a cylinder device inspection device having a cylinder made of a magnetic material and a piston that slides in the cylinder, and is arranged in a non-contact manner in the vicinity of the cylinder. An electromagnetic pickup that electrically detects vibration generated during sliding with respect to the cylinder by electromagnetic induction; and a determination device that determines whether the cylinder device is abnormal based on the vibration detected by the electromagnetic pickup.

  The inspection method of the above embodiment is an inspection method of a cylinder device having a cylinder made of a magnetic material and a piston that slides in the cylinder, and is an electromagnetic device arranged in a non-contact manner in the vicinity of the cylinder. A detection step of electrically detecting vibration generated when the piston slides with respect to the cylinder by an electromagnetic induction action, and a determination for determining whether or not the cylinder device is abnormal based on the vibration detected by the electromagnetic pickup And a process.

  According to the inspection device and the inspection method of the embodiment, since the vibration is detected by the electromagnetic induction action with the non-contact electromagnetic pickup with respect to the cylinder device, the work of attaching the electromagnetic pickup to the cylinder device becomes unnecessary. Therefore, inspection can be facilitated. Further, since the electromagnetic pickup is not in contact with the cylinder device, it has a long life. In addition, since the electromagnetic pickup detects vibrations of cylinders arranged in close proximity by electromagnetic induction action, the influence of external noise can be suppressed. Therefore, an accurate inspection can be performed.

11 Cylinder device 15 Cylinder 35 Piston 60 Inspection device 62 Electromagnetic pickup 63 Judgment device

Claims (2)

An inspection apparatus for a cylinder device having a cylinder made of a magnetic material and a piston sliding in the cylinder,
A damping force tester that detects the damping force by expanding and contracting the cylinder device and a non-contact arrangement in the vicinity of the cylinder. Electric noise generated by the damping force tester when the piston slides on the cylinder is Electromagnetic pickup to detect automatically,
A determination device for determining whether or not the cylinder device is abnormal based on an abnormal sound pressure detected by the electromagnetic pickup;
An inspection apparatus for a cylinder device, comprising: An inspection method for a cylinder device having a cylinder made of a magnetic material and a piston sliding inside the cylinder,
Using an electromagnetic pickup arranged in non-contact in the vicinity of the damping force tester and the cylinder for detecting the damping force by expansion and contraction of the cylinder device, the said piston by expanding and contracting the cylinder device by said damping force tester A detection step of electrically detecting abnormal noise generated during sliding with respect to the cylinder by electromagnetic induction with the electromagnetic pickup ;
A determination step of determining whether or not the cylinder device is abnormal based on an abnormal sound pressure detected by the electromagnetic pickup;
A method for inspecting a cylinder device, comprising:

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