JP5895799B2 - Oil seal inspection device - Google Patents

Description

  The present invention relates to an oil seal inspection device for determining a mounting state of a garter spring in an oil seal.

  2. Description of the Related Art Conventionally, an oil seal is known as a sealing device that seals the outer periphery of a rotating part in an automobile or industrial machine with a seal lip portion. The oil seal includes a seal lip portion that contacts the peripheral surface of the shaft, and an annular garter spring for fastening the seal lip portion to the shaft.

  With regard to such an oil seal, in Patent Document 1, a mounting portion for mounting a garter spring is formed on a seal lip portion, and a part of the garter spring mounted on the mounting portion is visible to the outside. An oil seal having a notch or a hole in the end face of the seal lip portion is disclosed.

JP 2012-122581 A

  However, in the oil seal of Patent Document 1, the garter spring is visually confirmed from the notch or hole of the seal lip portion. Depending on how the garter spring is seen from the notch or hole, the garter to the seal lip portion is determined. There is a possibility that it is impossible to accurately determine whether or not the spring is attached.

  In addition, even if the garter spring is detached from the groove of the seal lip only with a part of the circumferential direction of the oil seal, the garter spring is attached to the groove of the seal lip at a portion that can be seen through the notch or hole. In some cases, the garter spring is detached from the groove of the seal lip portion at a portion that cannot be visually observed through the notch or the hole. In this case, the part where the garter spring is removed from the groove portion of the seal lip portion cannot be visually checked with a notch or a hole, and the attachment state of the garter spring to the seal lip portion cannot be accurately determined.

  Accordingly, the present invention has been made to solve the above-described problems, and it is an object of the present invention to provide an oil seal inspection device that can accurately determine the attachment state of a garter spring to a seal lip portion in an oil seal. To do.

  One aspect of the present invention made to solve the above-described problem is that an oil seal including a seal lip portion and a garter spring attached to the seal lip portion is discriminated from the state of attachment of the garter spring to the seal lip portion. An oil seal inspection device includes an oil seal holder that holds the oil seal by supporting an inner peripheral portion of the seal lip portion, and the oil seal holder includes an inner peripheral portion of the seal lip portion. A garter spring detection unit for detecting the garter spring is provided on a surface to be supported, and the attachment state of the garter spring to the seal lip is determined based on detection information from the garter spring detection unit. To do.

  According to this aspect, the garter spring is detected by the garter spring detection part provided on the surface supporting the inner peripheral part of the seal lip part of the oil seal. Therefore, there is no variation in detection accuracy by visual confirmation as in the prior art, and the garter spring can be accurately detected. Therefore, based on the detection information from the garter spring detection unit, it is possible to accurately determine the attachment state of the garter spring to the seal lip portion of the oil seal.

  In the above aspect, the oil seal holder is preferably an oil seal press-fitting jig for press-fitting the oil seal into a press-fit member.

  According to this aspect, by attaching the oil seal to the oil seal press-fitting jig when the oil seal is press-fitted into the press-fit member, it is possible to determine the state of attachment of the garter spring to the seal lip portion of the oil seal. Therefore, it is possible to efficiently perform the press-fitting of the oil seal into the press-fitted member and the determination of the mounting state of the garter spring. Further, even when the garter spring is detached from the seal lip when attaching the oil seal to the oil seal press-fitting jig, this can be determined.

  In the above aspect, it is preferable that the garter spring is made of a magnetic material, and the garter spring detection unit includes a coil sensor.

  According to this aspect, since the garter spring can be detected by the coil sensor, it is possible to accurately determine the attachment state of the garter spring to the seal lip portion of the oil seal based on the detection information from the garter spring detection unit. .

  In the said aspect, it is preferable that the said garter spring detection part is provided over 1 round with respect to the circumferential direction of the said oil seal.

  According to this aspect, it is possible to accurately determine the attachment state of the garter spring over one turn in the circumferential direction of the oil seal. Therefore, it can be determined whether or not the garter spring is normally attached to the seal lip portion around the entire circumference of the oil seal. Therefore, for example, even when the garter spring is detached from the groove portion of the seal lip portion in a part of the circumferential direction of the oil seal, this can be determined.

  According to the oil seal inspection device of the present invention, it is possible to accurately determine the state of attachment of the garter spring to the seal lip portion of the oil seal.

It is a schematic block diagram of an oil seal inspection apparatus. It is sectional drawing which shows a mode that an oil seal is press-fitted in a workpiece | work using the jig for oil seal press-fitting which comprises an oil seal inspection apparatus. It is a figure which shows the sensor output of the coil sensor at the time of press-fitting an oil seal in a workpiece | work. It is a figure which shows the evaluation result regarding discrimination | determination of the mounting condition of the garter spring to a seal lip part. FIG. 5 is a perspective view of an oil seal press-fitting jig to which an oil seal is attached, and shows a case where a garter spring is disengaged from a groove portion of a seal lip portion at a circumferential portion of the oil seal. It is a figure which shows the evaluation result of the output voltage from a coil sensor in each mounting condition of the garter spring to a seal lip part. It is a side view of the jig for oil seal press fitting of a modification.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. Here, FIG. 1 is a schematic configuration diagram of the oil seal inspection apparatus. FIG. 2 is a cross-sectional view showing a state in which an oil seal is press-fitted into a workpiece using an oil seal press-fitting jig constituting the oil seal inspection device.

<Configuration of oil seal>
First, a general configuration of the oil seal 10 to be inspected by the oil seal inspection apparatus 1 will be briefly described.

  As shown in FIG. 2, the oil seal 10 includes an annular attachment portion 18 for attaching the oil seal 10 to the inner peripheral surface 16 of the shaft hole 14 of the work 12 (press-fit member), and an inner portion of the attachment portion 18. An annular seal 20 provided on the peripheral side, and an annular seal slidably in close contact with the outer peripheral surface of a shaft (not shown) provided on the inner peripheral side of the link 20 and inserted into the shaft hole 14 of the work 12. And a lip portion 22.

  The oil seal 10 is attached to a metal ring 24, a rubber-like elastic body 26 attached to the metal ring 24, and a groove portion 28 of the seal lip portion 22 that is a part of the rubber-like elastic body 26. And a garter spring 30. The garter spring 30 is formed by connecting coil springs in an annular shape, and supplements the tight force of the seal lip portion 22 against the rotating shaft. Here, the garter spring 30 is made of a magnetic material such as iron.

<Configuration of oil seal inspection device>
Next, the configuration of the oil seal inspection apparatus 1 will be described.

  As shown in FIG. 1, the oil seal inspection apparatus 1 includes an oil seal press-fitting jig 32, a drive unit 34, a control unit 36, and the like.

  As shown in FIG. 2, the oil seal press-fitting jig 32 is an oil seal holder that holds the oil seal 10 by supporting the inner peripheral portion 44 of the seal lip portion 22 of the oil seal 10. The oil seal press-fitting jig 32 is a jig for press-fitting the oil seal 10 into the work 12 that is a press-fit member. The oil seal press-fitting jig 32 includes a base 38 and a flange 40.

  The base 38 is formed in a cylindrical shape. Here, the base 38 is made of a non-magnetic material, and for example, aluminum, SUS304, or the like can be considered. Note that the base 38 may be plated with a nonmagnetic material on the outer peripheral surface 42 thereof. When the oil seal 10 is press-fitted into the workpiece 12, the base 38 holds the oil seal 10 by supporting the inner peripheral portion 44 of the seal lip portion 22 at the outer peripheral surface 42.

  The flange 40 is formed in a cylindrical shape and has a diameter larger than that of the base 38. The flange 40 may be a magnetic material, but is more preferably a non-magnetic material in order to reduce the influence on the garter spring detection unit 46.

  In this embodiment, as shown in FIGS. 1 and 2, the oil seal press-fitting jig 32 is attached to the outer peripheral surface 42 of the base 38 that supports the inner peripheral portion 44 of the seal lip portion 22 of the oil seal 10. A garter spring detector 46 for detecting 30 is provided. More specifically, on the outer peripheral surface 42 of the base 38, the connecting portion 20 of the oil seal 10 is brought into contact with the flange 40 as shown in FIG. 2 in the central axis direction (vertical direction in FIG. 2) of the oil seal press-fitting jig 32. A garter spring detector 46 is provided at a position where the garter spring 30 is disposed when the garter spring 30 is disposed. The garter spring detection unit 46 is provided over one circumference in the circumferential direction of the oil seal 10 (the circumferential direction of the base 38).

  The garter spring detection unit 46 includes a coil cover 48 and a coil sensor 50. Here, as shown in FIG. 1, the coil sensor 50 is installed in a wound shape in the circumferential direction of the base 38 of the oil seal press-fitting jig 32, that is, in the circumferential direction of the oil seal 10.

  The coil cover 48 is provided on the outer peripheral side of the coil sensor 50 and is a component for protecting the coil sensor 50. The coil cover 48 is made of a non-magnetic material, and the material may be aluminum, SUS304, or the like. Note that the coil cover 48 may be plated with a nonmagnetic material on the outer peripheral surface thereof.

  In addition, the specification which is not provided with the coil cover 48 as the garter spring detection part 46 is also considered. At this time, the inside of the base 38 of the oil seal press-fitting jig 32 is processed, and the coil sensor 50 is disposed inside the base 38, thereby making the coil cover 48 unnecessary. That is, the garter spring detection unit 46 is composed of the coil sensor 50 and a nonmagnetic material (for example, aluminum or SUS304) that constitutes a part of the base 38 existing on the outer peripheral side of the coil sensor 50.

  The drive unit 34 is a means that includes an actuator that drives the oil seal press-fitting jig 32. The drive unit 34 drives the oil seal press-fitting jig 32 according to an instruction from the control unit 36.

  The control unit 36 is composed of, for example, a microcomputer, and the coil sensor 50 and the drive unit 34 are electrically connected. Detection information (sensor output, output voltage) from the coil sensor 50 is input to the control unit 36. Then, the control unit 36 determines the mounting state of the garter spring 30 to the seal lip portion 22 in the oil seal 10 based on the detection information from the input coil sensor 50. Further, the control unit 36 controls the driving of the oil seal press-fitting jig 32 via the driving unit 34 according to the determination result of the mounting state of the garter spring 30.

<Operation of oil seal inspection device>
Next, as an operation of the oil seal inspection apparatus 1 having the above-described configuration, in the oil seal press-fitting process of press-fitting the oil seal 10 into the workpiece 12, the oil lip portion 22 in the oil seal 10 is used by using the oil seal inspection apparatus 1. An oil seal inspection method for discriminating the state of attachment of the garter spring 30 to the head will be described.

  First, the oil seal 10 is attached (held) to the oil seal press-fitting jig 32 manually or automatically. At this time, the base 38 of the oil seal press-fitting jig 32 is inserted inside the inner peripheral portion 44 of the seal lip portion 22 of the oil seal 10. Then, as shown in FIG. 2, the oil seal 10 is oiled so that the inner peripheral portion 44 of the seal lip portion 22 of the oil seal 10 is supported by the outer peripheral surface 42 of the base 38 of the oil seal press-fitting jig 32. Attached to the seal press-fitting jig 32.

  Next, the oil seal press-fitting jig 32 to which the oil seal 10 is attached is moved downward toward the workpiece 12 in FIG. Then, the base 38 and the oil seal 10 of the oil seal press-fitting jig 32 are inserted into the shaft hole 14 of the work 12, and the oil seal 10 is press-fitted into the inner peripheral surface 16 of the shaft hole 14 of the work 12.

  Next, the base 38 of the oil seal press-fitting jig 32 is retracted from the workpiece 12 in the upward direction of FIG. At this time, since the oil seal 10 is press-fitted into the inner peripheral surface 16 of the shaft hole 14 of the work 12, the oil seal 10 is removed from the oil seal press-fitting jig 32, and only the oil seal press-fitting jig 32 is used. Evacuate from. The oil seal 10 is press-fitted into the work 12 as described above.

  In this embodiment, as described above, the oil seal press-fitting jig 32 includes the garter spring detection unit 46. And the oil seal test | inspection apparatus 1 discriminate | determines the mounting condition of the garter spring 30 in the oil seal press injection process which press-fits the oil seal 10 to the workpiece | work 12 as mentioned above.

  Specifically, the control unit 36 determines the mounting state of the garter spring 30 based on detection information from the coil sensor 50. Here, in the oil seal press-fitting process of press-fitting the oil seal 10 into the workpiece 12, the sensor output (detection information) from the coil sensor 50 input to the control unit 36 is detected as shown in FIG.

  For example, when the garter spring 30 is attached to the seal lip portion 22, when the oil seal 10 is first attached to the oil seal press-fitting jig 32, as the garter spring 30 approaches the coil sensor 50, The sensor output from the coil sensor 50 gradually increases as shown by the solid line in FIG. 3 (region a in FIG. 3).

  When the connecting portion 20 of the oil seal 10 comes into contact with the flange 40 of the oil seal press-fitting jig 32 and the attachment of the oil seal 10 to the oil seal press-fitting jig 32 is completed, as shown in FIG. The garter spring 30 is disposed at the position of the coil sensor 50. At this time, the sensor output from the coil sensor 50 has a maximum value as shown by the solid line in FIG. 3 (region b in FIG. 3).

  Thereafter, when the oil seal 10 is removed from the oil seal press-fitting jig 32 after the oil seal 10 is press-fitted into the workpiece 12, the garter spring 30 moves away from the coil sensor 50. Decreases gradually as indicated by the solid line in FIG. 3 (region c in FIG. 3).

  Thus, when the garter spring 30 is attached to the seal lip portion 22, as shown by the solid line in FIG. 3, before and after the oil seal 10 is attached to the oil seal press-fitting jig 32. A large difference occurs in the value of the sensor output from the coil sensor 50.

  On the other hand, when the garter spring 30 is not attached to the seal lip portion 22, the connecting portion 20 of the oil seal 10 contacts the flange 40 of the oil seal press-fitting jig 32 and the oil seal press-fit treatment of the oil seal 10 is performed. Even when the attachment to the tool 32 is completed, the sensor output from the coil sensor 50 hardly increases as shown by the broken line in FIG. 3 (region b in FIG. 3).

  As described above, when the garter spring 30 is not attached to the seal lip portion 22, as shown by the broken line in FIG. 3, before and after the oil seal 10 is attached to the oil seal press-fitting jig 32. There is almost no difference in the sensor output value from the coil sensor 50.

  As described above, when the garter spring 30 is attached to the seal lip portion 22 and when the garter spring 30 is not attached, before and after the oil seal 10 is attached to the oil seal press-fitting jig 32. And the difference in the sensor output value from the coil sensor 50 is different. Therefore, the oil seal inspection device 1 can determine whether or not the garter spring 30 is attached to the seal lip portion 22 based on detection information from the coil sensor 50. In addition, since the influence of the temperature of the coil sensor 50 and the oil seal press-fitting jig 32 and the variation in the material of the oil seal press-fitting jig 32 can be canceled, the presence or absence of the attachment of the garter spring 30 to the seal lip portion 22 is further determined. It can be determined with high accuracy.

  Further, the coil sensor 50 is formed by being wound around the circumference of the oil seal 10 as shown in FIG. Therefore, when the garter spring 30 is disengaged from the groove portion 28 of the seal lip portion 22 at a part of the circumferential direction of the oil seal 10, the garter spring 30 extends over the entire circumference of the oil seal 10 in the circumferential direction. The value of the sensor output from the coil sensor 50 is reduced as compared with the case where the groove portion 28 is normally mounted. Therefore, the oil seal inspection device 1 can also determine based on the sensor output from the coil sensor 50 that the garter spring 30 is disengaged from the groove portion 28 of the seal lip portion 22 in a part of the circumferential direction of the oil seal 10. it can.

  In addition, as shown in FIG. 1, the coil sensor 50 is formed by being wound around the circumference of the oil seal 10 so as to be limited on the outer circumferential surface 42 of the base 38 of the oil seal press-fitting jig 32. The coil sensor 50 can be arranged in the region. Therefore, the garter spring detection unit 46 can be provided in a compact manner.

  Here, FIG. 4 shows an evaluation result relating to the determination of the mounting state of the garter spring 30 to the seal lip portion 22 in the oil seal 10. In the evaluation shown in FIG. 4, the output voltage from the coil sensor 50 was evaluated using two coil covers 48 and two oil seals 10 each. When the oil seal 10 is not attached to the oil seal press-fitting jig 32 (indicated as “no oil seal” in FIG. 4), the oil seal 10 in which the garter spring 30 is not attached to the seal lip portion 22 is oiled. When attached to the seal press-fitting jig 32 (indicated as “with oil seal, no garter spring” in FIG. 4), the oil seal 10 in which the garter spring 30 is attached to the seal lip portion 22 is used for the oil seal press-fitting treatment. Evaluation was performed for the case where it was attached to the tool 32 (indicated as “with oil seal, with garter spring” in FIG. 4).

  Then, as shown in FIG. 4, there is a difference in the absolute value of the output voltage from the coil sensor 50 for the two coil covers 48, but the change in the output voltage from the coil sensor 50 is the same for the two oil seals 10. Occurred.

  Specifically, as compared to the case where the oil seal 10 is not attached to the oil seal press-fitting jig 32, the oil seal 10 in which the garter spring 30 is not attached to the seal lip portion 22 is used as the oil seal press-fitting jig 32. When attached, the output voltage from the coil sensor 50 slightly increased. This is considered because the coil sensor 50 detected the metal ring 24 of the oil seal 10. Compared with the case where the oil seal 10 in which the garter spring 30 is not attached to the seal lip portion 22 is attached to the oil seal press-fitting jig 32, the oil seal 10 in which the garter spring 30 is attached to the seal lip portion 22. Was attached to the oil seal press-fitting jig 32, the output voltage from the coil sensor 50 was further increased.

  As described above, a difference occurs in the absolute value of the output voltage from the coil sensor 50 due to the manufacturing error of the coil cover 48, but the relative difference (δ1, δ2) depending on whether or not the garter spring 30 is attached to the seal lip portion 22 is changed. There wasn't. Therefore, it has been found that the presence or absence of the attachment of the garter spring 30 to the seal lip portion 22 can be reliably determined based on the output voltage from the coil sensor 50.

  Further, when the oil seal 10 is attached to the oil seal press-fitting jig 32, for example, as shown in FIG. 5, the garter spring 30 is removed from the groove portion 28 of the seal lip portion 22 in half the circumference of the oil seal 10 as shown in FIG. FIG. 6 shows the evaluation result of the output voltage from the coil sensor 50 when it is off (indicated as “half off” in FIG. 6). In the example shown in FIG. 5, a gap Δ is formed between the garter spring 30 and the seal lip portion 22 where the garter spring 30 is disengaged from the groove portion 28 of the seal lip portion 22.

  Then, as shown in FIG. 6, in the case of “halfway off”, the output voltage value is higher than when the garter spring 30 is not attached to the seal lip portion 22 (indicated as “not attached” in FIG. 6). However, compared to the case where the garter spring 30 is normally mounted in the groove 28 of the seal lip 22 over the entire circumference of the oil seal 10 (indicated as “normally mounted” in FIG. 5). The output voltage was low.

  Thus, based on the output voltage value from the coil sensor 50, the garter spring 30 is normally mounted in the groove portion 28 of the seal lip portion 22 over the entire circumference in the circumferential direction of the oil seal 10, or the oil It is also possible to determine whether the garter spring 30 is disengaged from the groove portion 28 of the seal lip portion 22 in a part of the seal 10 in the circumferential direction.

  6 also shows the evaluation result of the output voltage value from the coil sensor 50 when the oil seal 10 is not attached to the oil seal press-fitting jig 32 (indicated as “no oil seal” in FIG. 6). ing.

<Effect of this embodiment>
According to the present embodiment, the oil seal inspection device 1 that determines the mounting state of the garter spring 30 to the seal lip portion 22 for the oil seal 10 including the seal lip portion 22 and the garter spring 30 mounted to the seal lip portion 22. 2 has an oil seal press-fitting jig 32 that holds the oil seal 10 by supporting the inner peripheral part 44 of the seal lip part 22, and the oil seal press-fitting jig 32 is an inner peripheral part of the seal lip part 22. A garter spring detection unit 46 that detects the garter spring 30 is provided on the outer peripheral surface 42 that supports 44, and the mounting state of the garter spring 30 to the seal lip portion 22 is determined based on the output voltage from the garter spring detection unit 46. .

  As described above, the oil seal inspection device 1 has the garter spring detection unit 46 provided on the outer peripheral surface 42 of the base 38 of the oil seal press-fitting jig 32 that supports the inner peripheral portion 44 of the seal lip portion 22 of the oil seal 10. The garter spring 30 is detected. Therefore, there is no variation in detection accuracy by visual confirmation as in the prior art, and the garter spring 30 can be detected accurately. Therefore, the mounting state of the garter spring 30 to the seal lip portion 22 of the oil seal 10 can be accurately determined based on the output voltage from the garter spring detection unit 46.

  Further, since the oil seal inspection apparatus 1 uses the oil seal press-fitting jig 32 for press-fitting the oil seal 10 into the work 12, the oil seal 10 is used for press-fitting the oil seal 10 when press-fitting the oil seal 10 into the work 12. By attaching the jig 32 to the jig 32, it is possible to determine whether the garter spring 30 is attached to the seal lip portion 22 of the oil seal 10. Therefore, the press-fitting of the oil seal 10 into the workpiece 12 and the determination of the mounting state of the garter spring 30 can be efficiently performed together. Further, even when the garter spring 30 is detached from the seal lip portion 22 when the oil seal 10 is attached to the oil seal press-fitting jig 32, this can be determined.

  Further, since the garter spring 30 is a magnetic body and the garter spring detection unit 46 includes the coil sensor 50, the garter spring 30 can be detected by the coil sensor 50. Therefore, based on the output voltage from the garter spring detection unit 46, the mounting state of the garter spring 30 to the seal lip portion 22 in the oil seal 10 can be accurately determined.

  Further, since the garter spring detection unit 46 is provided over one circumference in the circumferential direction of the oil seal 10, it is possible to accurately detect the mounting state of the garter spring 30 over one circumference in the circumferential direction of the oil seal 10. . Therefore, it can be determined whether or not the garter spring 30 is normally attached to the seal lip portion 22 on the entire circumference of the oil seal 10. Therefore, for example, it can be determined that the garter spring 30 is disengaged from the groove portion 28 of the seal lip portion 22 in a part of the circumferential direction of the oil seal 10.

<Modification>
In addition, the following modifications can be considered. For example, in the above description, one coil sensor 50 is formed by winding it in the circumferential direction of the base 38, but instead, a plurality of small coil sensors 52 are arranged in the circumferential direction of the base 38 as shown in FIG. May be arranged side by side. Thereby, it can be more reliably determined that the garter spring 30 is disengaged from the groove portion 28 of the seal lip portion 22 in a part of the circumferential direction of the oil seal 10.

  Further, a pressure sensor may be used instead of the coil sensor 50.

  It should be noted that the above-described embodiment is merely an example and does not limit the present invention in any way, and various improvements and modifications can be made without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 1 Oil seal test | inspection apparatus 10 Oil seal 12 Work piece 14 Shaft hole 16 Inner peripheral surface 18 Mounting part 20 Connection part 22 Seal lip part 24 Metal ring 26 Rubber-like elastic body 28 Groove part 30 Garter spring 32 Oil seal press-fit jig 34 Drive part 36 Control part 38 Base 40 Flange 42 Outer peripheral surface 44 (of the base) Inner peripheral part 46 (of the seal lip part) 46 Garter spring detection part 48 Coil cover 50 Coil sensor 52 Coil sensor

Claims (4)

In an oil seal inspection apparatus for determining an attachment state of the garter spring to the seal lip part for an oil seal including a seal lip part and a garter spring attached to the seal lip part,
An oil seal holder that holds the oil seal by supporting an inner peripheral portion of the seal lip portion;
The oil seal holder includes a garter spring detection portion that detects the garter spring on a surface that supports an inner peripheral portion of the seal lip portion,
Determining the mounting state of the garter spring to the seal lip portion based on detection information from the garter spring detection portion;
Oil seal inspection device. In the oil seal inspection device according to claim 1,
The oil seal holder is an oil seal press-fitting jig for press-fitting the oil seal into a press-fit member;
Oil seal inspection device characterized by In the oil seal inspection device according to claim 1 or 2,
The garter spring is made of a magnetic material,
The garter spring detection unit includes a coil sensor;
Oil seal inspection device. In the oil seal inspection device according to any one of claims 1 to 3,
The garter spring detector is provided over one circumference in the circumferential direction of the oil seal;
Oil seal inspection device.

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