Method for checking the displacement of a vibration isolation device and method for manufacturing a vibration isolation device

Abstract

To provide a method for checking the misalignment of a vibration isolation device that allows for easy confirmation of the discrepancy between the center position of the width of the vibration isolation base and the target position. [Solution] When the vibration-damping base 13 is clamped with the caliper 20, if the measurement result by the caliper 20 is within the allowable limit dimension of the target width, the center position P3 of the width W of the vibration-damping base 13 being measured will approximately coincide with the position of half the target width. The caliper 20 has a mark B at the position indicated by the measurement result of half the target width, and this mark B approximately coincides with the center position P3. In addition, a mark A indicating the target position is attached to the outer surface of the outer member 12. Therefore, by checking whether the measurement result is within the allowable limit dimension of the target width and whether marks A and B coincide, it is easy to confirm whether the center position P3 and the target position are approximately coincident or misaligned.

Description

Technical Field

[0001] The present invention relates to a method for checking the deviation between the center position and the target position of the width of a vibration isolation base, and a method for manufacturing a vibration isolation device using the checking method.

Background Art

[0002] In a vibration isolation device in which the outer peripheral surface of a shaft-shaped inner member and the inner peripheral surface of a cylindrical outer member are connected by a vibration isolation base made of an elastic body, there are cases where both end surfaces in the axial direction of the vibration isolation base are recessed with respect to both ends in the axial direction of the outer member. When adjusting the width between both end surfaces of such a vibration isolation base, first, both end surfaces are cut in the axial direction using a router or the like. Then, as described in Patent Document 1, a measuring instrument such as calipers having convex portions protruding from a pair of jaws is used to measure the width of the vibration isolation base hidden by the outer member.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, since both end surfaces of the vibration isolation base are in positions recessed with respect to the outer member, it is difficult to adjust the cutting amounts of both end surfaces of the vibration isolation base respectively. If the balance of the cutting amounts of both end surfaces is lost, the center position of the width of the vibration isolation base after adjustment will deviate from the target position, which is the center position at the design value. In other words, it is difficult to check the deviation between the center position and the target position of the width of the vibration isolation base during or after adjustment, so it is difficult to adjust the cutting amounts of both end surfaces respectively. Note that not only when adjusting the width of the vibration isolation base, but also in the inspection work of the vibration isolation device, etc., it is difficult to check the deviation between the center position and the target position of the width of the vibration isolation base.

[0005] The present invention was made to solve the above-mentioned problems, and aims to provide a method for confirming the misalignment of a vibration isolation device that allows for easy confirmation of the misalignment between the center position of the width of the vibration isolation base and the target position, and a method for manufacturing a vibration isolation device using this confirmation method. [Means for solving the problem]

[0006] To achieve this objective, the present invention provides a method for confirming the misalignment of a vibration isolation device, wherein the outer circumferential surface of an axial inner member and the inner circumferential surface of a cylindrical outer member are connected by a vibration isolation base made of an elastic material, and the axial end faces of the vibration isolation base are recessed relative to both axial ends of the outer member, and the method for confirming the misalignment between the center position of the width between the end faces of the vibration isolation base and a predetermined target position, comprising: a vibration isolation side marking step of attaching a vibration isolation side mark indicating the target position to the outer circumferential surface of the outer member; a clamping step of clamping the vibration isolation base with a measuring instrument capable of measuring the width by clamping the vibration isolation base from both axial sides, the measuring instrument having a measurement side mark at a position where the measurement result indicates half of the target width, which is the design value of the width; and a confirmation step of confirming the misalignment between the vibration isolation side mark made in the vibration isolation side marking step and the measurement side mark while confirming whether the measurement result by the measuring instrument is within the range of the allowable limit dimension of the target width, in the state in which the vibration isolation base is clamped by the clamping step.

[0007] Another method for checking the misalignment of a vibration isolation device involves connecting the outer circumferential surface of an axial inner member and the inner circumferential surface of a cylindrical outer member with an elastic vibration isolation base, and the axial end faces of the vibration isolation base being recessed relative to both axial ends of the outer member. The method for checking the misalignment between the center position of the width between the end faces of the vibration isolation base and a predetermined target position involves a vibration isolation side marking step of marking the axial center position on the outer circumferential surface of the outer member, and a measurement step of measuring the width by sandwiching the vibration isolation base from both axial sides. The device comprises a clamping step of clamping the vibration-damping base with the measuring instrument, wherein the measuring instrument has a measurement mark placed at a position shifted from the position indicated by the measurement result by the amount of the displacement between the vibration-damping side mark and the target position, in the direction in which the vibration-damping side mark is shifted from the target position by the amount of the displacement between the vibration-damping side mark and the target position, and half of the target width which is the design value of the width; and a confirmation step of checking the displacement between the vibration-damping side mark and the measurement mark made in the vibration-damping side marking step while the vibration-damping base is clamped by the clamping step, while confirming whether the measurement result by the measuring instrument is within the range of the allowable limit dimension of the target width. [Effects of the Invention]

[0008] According to the method for confirming misalignment of a vibration isolation device described in claim 1, when the vibration isolation base is clamped in the clamping step, if the measurement result by the measuring instrument is within the allowable limit dimension of the target width, the center position of the width of the vibration isolation base being measured and the position of half the target width will approximately coincide. The measuring instrument has a measurement mark at the position indicated by the measurement result of half the target width, and this measurement mark will approximately coincide with the center position of the width of the vibration isolation base being measured. In addition, in the vibration isolation marking step, a vibration isolation mark indicating the target position is attached to the outer surface of the outer member. Therefore, in the confirmation step, if the measurement result is within the allowable limit dimension of the target width and the measurement mark and vibration isolation mark coincide, it can be easily confirmed that the center position of the width of the vibration isolation base and the target position are approximately coincident. Also, if the measurement result is not within the allowable limit dimension of the target width, or if the measurement mark and vibration isolation mark are misaligned, it can be easily confirmed that the center position of the width of the vibration isolation base and the target position are misaligned.

[0009] The method for confirming the misalignment of a vibration isolation device described in claim 2 is a method in which the vibration isolation side mark and the measurement side mark are shifted by the same amount and in the same direction as the method for confirming the misalignment of a vibration isolation device described in claim 1, and it produces the same effect as the method for confirming the misalignment of a vibration isolation device described in claim 1.

[0010] The method for confirming misalignment of a vibration damping device according to claim 3 provides the following effects in addition to the effects of the method for confirming misalignment of a vibration damping device according to claim 1. The vibration damping side marking step is a step of setting the vibration damping device in a marking jig to attach a vibration damping side mark to the outer circumferential surface of the outer member. The inner member or one end of the outer member in the axial direction is brought into contact with the end contact surface of the marking jig, and the marking part that forms the vibration damping side mark is brought into contact with the outer circumferential surface of the outer member, thereby attaching the vibration damping side mark to the outer circumferential surface. This marking part is fixed at a position axially away from the end contact surface. Therefore, each time multiple vibration damping devices are set in the marking jig in sequence, a vibration damping side mark can be easily attached to the outer circumferential surface of the outer member at the same distance from the part that contacted the end contact surface. This simplifies the process of attaching vibration damping side marks to multiple similar vibration damping devices, for example, in inspection work, by using the marking jig.

[0011] The method for manufacturing a vibration isolation device described in claim 4 is a method for manufacturing a vibration isolation device, comprising a method for confirming the misalignment of a vibration isolation device described in any one of claims 1 to 3, and having the following effects in addition to the effects of the misalignment confirmation method. In the method for manufacturing a vibration isolation device, if it is confirmed in the confirmation step that the measurement side mark and the vibration isolation side mark do not coincide, or that the measurement result of the measuring instrument is not within the range of the permissible limit dimension of the target width, in the cutting step, after removing the measuring instrument from the vibration isolation base, at least one of the end faces is cut. After this cutting step, the process returns to the clamping step and the confirmation step is performed. This allows, for example, the clamping step, confirmation step, and cutting step to be repeated until it is confirmed in the confirmation step that the measurement side mark and the vibration isolation side mark coincide and the measurement result of the measuring instrument is within the range of the permissible limit dimension of the target width. Therefore, a vibration isolation device can be easily manufactured in which the width of the vibration isolation base is within the range of the permissible limit dimension of the target width and the center position of the width of the vibration isolation base substantially coincides with the target position.

[0012] The method for manufacturing a vibration-damping device described in claim 5 provides the following effects in addition to the effects of the method for manufacturing a vibration-damping device described in claim 4. The measuring instrument is a caliper in which a slider slides against a main scale, and comprises a first protrusion protruding from a first jaw fixed to the main scale, and a second protrusion protruding from a second jaw fixed to the slider. In the clamping step, the first protrusion abuts against one end face of the end faces of the vibration-damping base, and the second protrusion abuts against the other end face. The grinding step includes a first grinding step in which, if the measurement mark is located on the first jaw side relative to the vibration-damping mark in the confirmation step, only the end face that the first protrusion was in contact with is ground down. Since the measurement mark is marked on the main scale, whether or not the vibration-damping mark and the measurement mark coincide depends on the distance from one end face to the vibration-damping mark, and not on the distance from the other end face. This method prevents machining failures that can occur when the width of the vibration-damping base becomes smaller than the minimum allowable dimension of the target width, due to machining the other end face in an attempt to align the vibration-damping mark with the measurement mark.

[0013] The method for manufacturing a vibration-damping device described in claim 6 provides the following effects in addition to the effects of the method for manufacturing a vibration-damping device described in claim 5. When one end face is machined in the first machining step until the measurement mark and the vibration-damping mark coincide, the width from the target position to one end face of the vibration-damping base is approximately equal to half of the target width. In the subsequent verification step, if the measurement mark and the vibration-damping mark coincide and the measurement result of the measuring instrument is greater than the upper limit of the allowable limit dimension of the target width, then in the second machining step, only the other end face that the second protrusion was in contact with is machined. As a result, the width from the target position to the other end face of the vibration-damping base is also approximately equal to half of the target width. As a result, a vibration-damping device can be manufactured more easily in which the width of the vibration-damping base is within the allowable limit dimension of the target width, and the center position of the width of the vibration-damping base is approximately equal to the target position. [Brief explanation of the drawing]

[0014] [Figure 1] This is a partial cross-sectional view of the caliper (measuring instrument) and vibration isolation device in the first embodiment. [Figure 2] This is a front view of a caliper and vibration damping device. [Figure 3]This is a flowchart showing how to check for misalignment of a vibration isolation device using calipers. [Figure 4] This is a flowchart showing the manufacturing method of a vibration isolation device using calipers. [Figure 5] (a) is a front view of the caliper and vibration damping device in the second embodiment, and (b) is a front view of the caliper and vibration damping device in the third embodiment. [Figure 6] (a) is a top view of the marking jig and vibration isolation device in the fourth embodiment, (b) is a front view of the marking jig and vibration isolation device in the direction of arrow VIb in Figure 6(a), and (c) is a cross-sectional view of the marking jig and vibration isolation device in the fifth embodiment. [Figure 7] (a) is a partial cross-sectional view of the caliper in the sixth embodiment, (b) is a partial cross-sectional view of the caliper in the seventh embodiment, (c) is a partial cross-sectional view of the caliper and the object to be measured in the eighth embodiment, and (d) is a partial cross-sectional view of the caliper in the ninth embodiment. [Figure 8] (a) is a partial cross-sectional view of the caliper and vibration damping device in the 10th embodiment, (b) is a partial cross-sectional view of the caliper and object to be measured in the 11th embodiment, (c) is a partial cross-sectional view of the caliper in the 12th embodiment, and (d) is a partial cross-sectional view of the caliper in the 13th embodiment. [Modes for carrying out the invention]

[0015] Preferred embodiments will be described below with reference to the attached drawings. Figure 1 is a partial cross-sectional view of the caliper (measuring instrument) 20 and vibration isolation device 10 in the first embodiment. Figure 1 shows a cross-section of the vibration isolation device 10 cut by a plane containing the axis C of the vibration isolation device 10, and a cross-section of the caliper 20 near the vibration isolation device 10.

[0016] The vibration isolator 10 is a vibration isolation bush for elastically coupling a vibration source side such as an arm used in a suspension mechanism of an automobile and a vibration receiving side such as a vehicle body. The vibration isolator 10 includes a shaft-shaped inner member 11, a cylindrical outer member 12 surrounding the outer peripheral side of the inner member 11, and a vibration isolation base 13 connecting the inner member 11 and the outer member 12.

[0017] Both the inner member 11 and the outer member 12 are cylindrical members centered on the axis C, and are made of a rigid material such as a steel material or an aluminum alloy. The width (dimension in the axis C direction) of the inner member 11 is longer than the width (dimension in the axis C direction) of the outer member 12. The center position P1 of the inner member 11 in the axis C direction and the center position P2 of the outer member 12 in the axis C direction coincide in the axis C direction.

[0018] The vibration isolation base 13 is a cylindrical member centered on the axis C, and is made of an elastic body such as rubber or a thermoplastic elastomer. The inner peripheral surface of the vibration isolation base 13 is vulcanized and adhered to the outer peripheral surface of the inner member 11, and the outer peripheral surface of the vibration isolation base 13 is vulcanized and adhered to the inner peripheral surface of the outer member 12. Thereby, the vibration isolation base 13 connects the inner member 11 and the outer member 12 over the entire circumference.

[0019] Both end faces 14 and 15 of the vibration isolation base 13 on both sides in the axis C direction are recessed inward in the axis C direction with respect to both ends of the inner member 11 and the outer member 12 in the axis C direction. The width W (dimension in the axis C direction) between these end faces 14 and 15, which is the width W of the vibration isolation base 13, is shorter than the width of the outer member 12. Further, in the present embodiment, the center position P3 of the width W of the vibration isolation base 13 is designed to coincide with the center positions P1 and P2 of the inner member 11 and the outer member 12 in the axis C direction.

[0020] The caliper 20 is a measuring instrument suitable for measuring the width W of this vibration isolation base 13. The caliper 20 is obtained by processing a general (commercially available) caliper provided with a main scale 21, a slider 22, a first jaw 23, and a second jaw 24 to provide a first convex portion 25 and a second convex portion 26.

[0021] The main scale 21 is a plate-shaped member extending in the longitudinal direction L (left-right direction in Figure 1). The direction perpendicular to the longitudinal direction L and the thickness direction (perpendicular to the plane of the paper in Figure 1) of the main scale 21 (up-down direction in Figure 1) is defined as the short direction S. The surface of the main scale 21 (the surface facing the viewer in Figure 1) is provided with the main scale markings 21a. The main scale markings 21a are a collection of multiple scale lines for indicating the measurement results by the caliper 20, and these multiple scale lines are arranged at equal intervals in the longitudinal direction L.

[0022] The slider 22 is a component that is slidably attached to the main scale 21 along the longitudinal direction L. The slider 22 is provided with a display unit 22a for displaying the measurement results from the caliper 20, a power button 22b for turning the caliper 20 on and off, and a zero button 22c for adjusting the zero point during measurement. In other words, the caliper 20 is a modified version of a general digital caliper.

[0023] When the power button 22b is pressed to turn on the caliper 20, the measurement result corresponding to the position of the slider 22 relative to the main scale 21 is displayed on the display unit 22a. When the power is turned on, pressing the zero button 22c sets the position of the slider 22 relative to the main scale 21 at the time of pressing as the zero point, and zero is displayed on the display unit 22a.

[0024] The first jaw 23 is a portion that extends from the main scale 21 in the short direction S and is fixed to the main scale 21. The second jaw 24 is a portion that extends from the slider 22 in the short direction S and is fixed to the slider 22. The first jaw 23 and the second jaw 24 (a pair of jaws) are formed as wide plates in the longitudinal direction L of the main scale 21.

[0025] The first jaw 23 includes an inner surface 23a provided on the slider 22 side in its longitudinal direction L, and an outer surface 23b provided on the opposite side of the longitudinal direction L of the main scale 21 from the inner surface 23a. The second jaw 24 includes an inner surface 24a facing the longitudinal direction L of the main scale 21 from the inner surface 23a, and an outer surface 24b provided on the opposite side of the longitudinal direction L of the main scale 21 from the inner surface 24a. The inner surfaces 23a, 24a and the outer surfaces 23b, 24b are formed parallel to each other and parallel to the short direction S.

[0026] In a typical digital caliper, the zero point is set by pressing the zero button 22c with the inner surfaces 23a and 24a touching each other, and then the object to be measured is placed between the inner surfaces 23a and 24a, and the distance between the inner surfaces 23a and 24a is displayed on the display unit 22a as the measurement result. However, in this typical digital caliper, the inner surfaces 23a and 24a cannot be brought into contact with the end faces 14 and 15 of the vibration-damping base 13, which are recessed relative to the outer member 12, and therefore the width W of the vibration-damping base 13 cannot be measured.

[0027] The first protrusion 25 and the second protrusion 26 are parts that enable the measurement of the width W of the vibration-damping base 13. The first protrusion 25 protrudes perpendicularly from the inner surface 23a of the first jaw 23 toward the second jaw 24. The second protrusion 26 protrudes perpendicularly from the inner surface 24a of the second jaw 24 toward the first jaw 23.

[0028] To measure the width W of the vibration-damping base 13 with the caliper 20, first, with the tip 25a of the first protrusion 25 and the tip 26a of the second protrusion 26 in contact, press the zero button 22c to set the zero point. As a result, the display unit 22a of the caliper 20 will display the distance between the first protrusion 25 and the second protrusion 26 as the measurement result.

[0029] After setting the zero point, the slider 22 is slid to make the distance between the first protrusion 25 and the second protrusion 26 greater than the width of the outer member 12. Then, while sliding the slider 22, the tip 25a of the first protrusion 25 is brought into contact with the end face 14 of the vibration-damping base 13, and the tip 26a of the second protrusion 26 is brought into contact with the end face 15 of the vibration-damping base 13, so that the vibration-damping base 13 is sandwiched between the first protrusion 25 and the second protrusion 26. As a result, the distance between the first protrusion 25 and the second protrusion 26 and the width W of the vibration-damping base 13 become approximately the same, and the width W is displayed as the measurement result on the display unit 22a. That is, the width W can be measured with a caliper 20.

[0030] A method for providing these first and second protrusions 25 and 26 to a general digital caliper will now be described. First, screw holes 23c are formed on the first jaw 23, opening on the inner surface 23a and outer surface 23b, respectively, along the longitudinal direction L. Similarly, screw holes 24c are formed on the second jaw 24, opening on the inner surface 24a and outer surface 24b, respectively, along the longitudinal direction L. Internal threads F are formed on the inner circumferential surfaces of these screw holes 23c and 24c along their entire length in the longitudinal direction L.

[0031] Next, a bolt 25b that can be fitted into the screw hole 23c is prepared. The bolt 25b comprises a shaft portion 25c with an external thread M formed on its outer surface, and a head portion 25d that protrudes outward from one end of the shaft portion 25c in a direction perpendicular to the axis. The external thread M of the shaft portion 25c of the prepared bolt 25b is fitted into the internal thread F of the screw hole 23c such that a part of the other end of the shaft portion 25c becomes a first protrusion 25 and protrudes from the inner surface 23a.

[0032] Similarly, a bolt 26b that can be fitted into the screw hole 24c is prepared. The bolt 26b comprises a shaft portion 26c with an external thread M formed on its outer surface, and a head portion 26d that protrudes outward from one end of the shaft portion 26c in a direction perpendicular to the axis. The external thread M of the shaft portion 26c of the prepared bolt 26b is fitted into the internal thread F of the screw hole 24c such that a part of the other end of the shaft portion 26c becomes a second protrusion 26 and protrudes from the inner surface 24a.

[0033] As described above, the first protrusion 25 and the second protrusion 26 can be easily formed by simply providing screw holes 23c and 24c in the first jaw 23 and the second jaw 24, respectively, and preparing bolts 25b and 26b that fit these screw holes 23c and 24c, respectively. Therefore, the configuration for providing the first protrusion 25 and the second protrusion 26 in the first jaw 23 and the second jaw 24 can be simplified. Although the first protrusion 25 and the second protrusion 26 were made attachable by providing screw holes 23c and 24c, a caliper 20 can also be made without the first protrusion 25 and the second protrusion 26 (bolts 25b and 26b) (the same applies to other embodiments).

[0034] It is preferable that the female threads F of the screw holes 23c and 24c be formed according to a specific standard so that standardized and commercially available bolts 25b and 26b can be used. By using commercially available bolts 25b and 26b, the first protrusion 25 and the second protrusion 26 can be formed at a lower cost compared to using custom-made bolts. By providing commercially available bolts 25b and 26b of different lengths, the lengths of the first protrusion 25 and the second protrusion 26 can be easily changed.

[0035] Furthermore, since the caliper 20 can be obtained by simply modifying a general-purpose caliper, it is possible to form the caliper 20 at a lower cost compared to the case where a caliper having the first protrusion 25 and the second protrusion 26 is custom-made. In particular, the caliper 20 is formed by modifying a general-purpose digital caliper having a zero button 22c. Therefore, the operator can easily understand the measurement result of the width W from the display unit 22a without having to subtract the sum of the protrusion amounts (dimensions in the longitudinal direction L) of the first protrusion 25 and the second protrusion 26 from the distance between the first jaw 23 and the second jaw 24.

[0036] With bolts 25b and 26b fitted into the screw holes 23c and 24c respectively, the heads 25d and 26d are pressed against the outer surfaces 23b and 24b respectively by axial force. This suppresses the rotation of bolts 25b and 26b, and prevents fluctuations in the amount of protrusion of the first and second protrusions 25 and 26 from the inner surfaces 23a and 24a during measurement, which would otherwise cause fluctuations in the measurement results obtained by the caliper 20.

[0037] Furthermore, since the shaft portions 25c and 26c form the tips 25a and 26a of the first and second protrusions 25 and 26, respectively, the tips 25a and 26a can be made thinner compared to the case where the tips 25a and 26a are heads 25d and 26d. As a result, even if the recess between the inner member 11 and the outer member 12 is relatively narrow, the tips 25a and 26a of the first and second protrusions 25 and 26 can be easily brought into contact with the end faces 14 and 15 of the vibration-damping base 13, which are the bottom of the recess.

[0038] The tips 25a and 26a are formed by flat surfaces having an outer diameter approximately the same as the valley diameter of the shaft portions 25c and 26c. This makes it easier to secure a contact area between the tips 25a and 26a and the end faces 14 and 15 when the tips 25a and 26a are the shaft portions 25c and 26c. As a result, the contact between the tips 25a and 26a and the end faces 14 and 15 can be stabilized, making it less likely for the caliper 20 to tilt relative to the end faces 14 and 15, and improving the measurement accuracy of the caliper 20.

[0039] Next, referring to Figures 2 and 3, a method for checking the displacement of the vibration isolation device 10 will be described, which involves using a caliper 20 to check whether the center position P3 of the width W of the vibration isolation base 13 is deviating from a predetermined target position. Figure 2 is a front view of the caliper 20 and the vibration isolation device 10. Figure 3 is a flowchart of the method for checking the displacement of the vibration isolation device 10 using the caliper 20.

[0040] As shown in Figure 3, in this deviation verification method, the worker first identifies the target width, which is the width W of the vibration isolation base 13 in the design value, and the allowable limit dimension of that target width, for use in each subsequent process (process S1). The allowable limit dimension has an upper limit, the maximum allowable dimension, and a lower limit, the minimum allowable dimension. The maximum allowable dimension is the target width (reference dimension) plus the upper tolerance, and the minimum allowable dimension is the target width minus the lower tolerance. These target widths and other parameters can be identified by the worker based on, for example, product specifications or requirements specifications.

[0041] After process S1, the worker marks a target position A (vibration-damping mark) on the outer surface of the outer member 12, which coincides with the center of the target width and the axis C direction (process S2, vibration-damping marking process). In this embodiment, the target positions are the center positions P1 and P2 of the inner member 11 and the outer member 12. These target positions can also be identified by the worker based on, for example, product specifications or requirements specifications.

[0042] Specifically, as shown in Figure 2, the adhesive surface of the adhesive tape 31 is attached to the outer circumferential surface of the outer member 12 so that one side edge (for example, the left side edge) of the adhesive tape 31 coincides with the center position P2 of the outer member 12. This makes one side edge of the adhesive tape 31 a linear mark A. It is preferable to mark points indicating the center position P2 at multiple locations in the circumferential direction on the outer circumferential surface of the outer member 12 using a known marking tool before attaching the adhesive tape 31 to the outer member 12. By attaching the adhesive tape 31 to the outer member 12 so that one side edge of the adhesive tape 31 follows these multiple points, the misalignment between the mark A and the center position P2 can be suppressed. In addition, since the width of the outer member 12 can be measured with a general caliper, the worker can easily understand the center position P2 of that width and easily make the mark A.

[0043] After step S2 in Figure 3, the worker marks the main scale 21 of the caliper 20 with a mark B (measurement side mark) at the position indicated by the measurement result of the caliper 20, which is half the target width (step S3). Specifically, as shown in Figure 2, the adhesive surface of the adhesive tape 32 is attached to the main scale 21 so that one side edge of the adhesive tape 32 (for example, the right side edge) becomes mark B. More specifically, one side edge of the adhesive tape 32 is aligned with the position of the scale line on the main scale 21a of the main scale 21a that indicates the value obtained by adding half the target width to the amount of protrusion of the tip 25a of the first protrusion 25 and attaching the tape.

[0044] Furthermore, by providing scale lines on the main scale 21a at 1 mm intervals, it becomes easier for the worker to recognize the position where one edge of the adhesive tape 32 should be aligned. As a result, the discrepancy between the position indicated by the measurement result of the caliper 20, which represents half of the target width, and mark B can be suppressed.

[0045] After step S3 in Figure 3, the worker measures the width W of the vibration-damping base 13 by clamping it with the caliper 20 using the measurement method described above (step S4, clamping step). Subsequent steps are basically performed with the vibration-damping base 13 still clamped in the caliper 20. Next, the worker checks whether the measurement result of the caliper 20 is within the range of the allowable limit dimension of the target width (step S5, part of the checking step). If this measurement result is within the range of the allowable limit dimension of the target width (S5: Yes), the center position P3 of the width W of the vibration-damping base 13 being measured and the position of half the target width approximately coincide in the longitudinal direction L (axis C direction). The caliper 20 has a mark B at the position where the measurement result indicates half the target width, so this mark B approximately coincides with the center position P3 of the vibration-damping base 13 being measured in the longitudinal direction L.

[0046] In step S5, if the measurement result is within the allowable limit dimension of the target width (S5: Yes), the worker then visually checks whether the mark A on the vibration isolation device 10 and the mark B on the caliper 20 coincide in the longitudinal direction L (i.e., whether they are misaligned in the longitudinal direction) (step S6, part of the verification process). Since the mark A made on the outer member 12 in step S2 indicates the target position, if the measurement result is within the allowable limit dimension of the target width (S5: Yes) and marks A and B coincide (S6: Yes), it is easy to confirm that the center position P3 and the target position are approximately coincident. Therefore, in this case, the vibration isolation device 10 being checked has been manufactured according to the design value, so the worker judges the vibration isolation device 10 to be a good product (OK product) (S7), and the method for checking the misalignment of the vibration isolation device 10 is completed.

[0047] On the other hand, if the measurement result is not within the allowable limit dimension of the target width (S5: No), it is difficult to determine the coincidence between the center position P3 and the target position based on the coincidence between mark A and mark B. Also, even if the measurement result is within the allowable limit dimension of the target width (S5: Yes), if mark A and mark B are misaligned (S6: No), it is easy to confirm that the center position P3 and the target position are misaligned.

[0048] Therefore, in these cases, the vibration isolation device 10 being checked is not manufactured according to the design specifications, so the worker determines that the vibration isolation device 10 is a defective product (NG product) (S8), and terminates the method for checking the misalignment of the vibration isolation device 10. Note that in the method for checking the misalignment of the vibration isolation device 10, if either process S5 or process S6 is "No", the vibration isolation device 10 being checked is determined to be a defective product, so the order of processes S5 and S6 may be swapped. Also, processes S2 and S3 may be swapped.

[0049] According to the method for checking the misalignment of the vibration isolation device 10 described above, it is easy to confirm whether the center position P3 and the target position are approximately in agreement or misaligned during inspection work on multiple vibration isolation devices 10 mass-produced using molds, etc. Furthermore, even in prototype work where the width W and center position P3 are adjusted by machining the end faces 14 and 15 of the vibration isolation base 13 for a vibration isolation device 10 formed to roughly dimensions, it is easy to confirm whether the center position P3 and the target position are approximately in agreement or misaligned. Similarly, in adjustment work such as adjusting the width W of a defective vibration isolation device 10, it is easy to confirm whether the center position P3 and the target position are approximately in agreement or misaligned.

[0050] In the method for checking the misalignment of the vibration isolation device 10 shown in Figure 3, the approximate agreement or misalignment between the center position P3 and the target position is checked at one point in the circumferential direction of the vibration isolation base 13. However, since the width W of the vibration isolation base 13 may fluctuate in the circumferential direction due to manufacturing errors, it is preferable to check the approximate agreement or misalignment between the center position P3 and the target position at multiple points in the circumferential direction of the vibration isolation base 13. Specifically, if the measurement result is within the allowable limit dimension of the target width (S5: Yes) and marks A and B coincide (S6: Yes), the process returns to step S4 to measure the width W of the vibration isolation base 13 at a different position in the circumferential direction than before, and then steps S5 and S6 are performed.

[0051] For example, steps S4 to S6 are repeated a total of six times at 60-degree intervals in the circumferential direction. If, in all six steps, the measurement result is within the allowable limit dimension of the target width (S5: Yes), and marks A and B coincide (S6: Yes), then in step S7, the vibration isolation device 10 is judged to be a good product. The number of measurements (angles between measurement positions) may be changed as appropriate. Furthermore, such measurements at multiple locations can be made by marking the entire circumference of the outer surface of the outer member 12.

[0052] On the other hand, if the measurement result is not within the allowable limit dimension of the target width even once before it is judged to be a good product (S5: No), or if marks A and B are misaligned (S6: No), the vibration isolation device 10 is judged to be a defective product in process S8. As a result, it is easy to confirm whether the center position P3 and the target position are roughly coincide or misaligned around almost the entire circumference of the vibration isolation base 13.

[0053] Furthermore, when performing the misalignment check method multiple times on multiple similar vibration isolation devices 10 in sequence using the same caliper 20, it is preferable to leave the mark B made on the caliper 20 in step S3 of the previous misalignment check method as is. This allows step S3 to be skipped in subsequent attempts, improving work efficiency.

[0054] Next, referring to Figure 4, a manufacturing (processing) method for the vibration isolation device 10, suitable for the above-mentioned prototyping and adjustment work, will be described. Figure 4 is a flowchart of the manufacturing method for the vibration isolation device 10 using a caliper 20. Note that the manufacturing method for the vibration isolation device 10 includes a method for checking the displacement of the vibration isolation device 10.

[0055] As shown in Figure 4, in the manufacturing method of the vibration isolation device 10, the worker first prepares an unfinished vibration isolation device 10 to be processed (one whose width W, etc., is not according to the design value), and performs steps S1 to S4 on the unfinished vibration isolation device 10 as described above. Next, the worker holds the vibration isolation base 13 with the caliper 20 and performs step S61 (part of the verification process), which corresponds to step S6 of the method for checking the misalignment of the vibration isolation device 10. In step S61, the worker checks whether the mark B on the caliper 20 coincides with or is misaligned in the longitudinal direction L with respect to the mark A on the unfinished vibration isolation device 10.

[0056] If mark B is shifted toward the first jaw 23 side relative to mark A (S61: first jaw side), the worker removes the caliper 20 from the vibration-damping base 13 and then grinds only the end face 14 of the vibration-damping base 13 that was in contact with the first protrusion 25 all around using a rotary tool or the like (S62, first grinding step). Here, the first protrusion 25 is fixed to the main scale 21 via the first jaw 23, and mark B is marked on the main scale 21. Therefore, the position of mark B on the caliper side relative to mark A on the vibration-damping device 10 side moves only when the end face 14 is ground.

[0057] In other words, whether or not marks A and B coincide depends on the distance from the end face 14 to mark A. Therefore, if mark B is shifted toward the first jaw 23 side relative to mark A, it indicates that the width from mark A (target position) to the end face 14 is greater than half of the target width. In such cases, by machining only the end face 14, the width from mark A (target position) to the end face 14 can be brought closer to half of the target width.

[0058] After step S62, the worker returns to step S4 to measure the width W with the caliper 20, and then performs step S61 again. The worker repeats steps S4 to S62 to shave the end face 14 until mark B aligns with mark A in the longitudinal direction L (S61: alignment), so that the width from mark A (target position) to end face 14 is approximately equal to half the target width. After this, the worker performs step S51 (part of the verification process), which corresponds to step S5 of the method for checking the misalignment of the vibration isolation device 10. If mark A and mark B align in the first step S61 (S61: alignment), then step S62 can be skipped and step S51 can be performed.

[0059] In contrast, in step S61, if mark B is shifted toward the second jaw 24 side relative to mark A (S61: second jaw side), mark A and mark B cannot be aligned even if the end face 14 is machined. Therefore, in this case, the operator determines that the machining of the unfinished vibration damping device 10 is a failure (NG) (S8), and terminates the manufacturing method of the vibration damping device 10. The machining failure is caused by over-machining of the end face 14 through the repetition of steps S4 to S62, or by the unfinished vibration damping device 10 having dimensions that could not be machined according to the design specifications from the beginning.

[0060] If mark B is shifted toward the second jaw 24 side relative to mark A (S61: second jaw side), the vibration damping device 10 may be reversed so that the end face 15 contacts the first protrusion 25, and step S61 may be repeated. If mark B is still shifted toward the second jaw 24 side relative to mark A (S61: second jaw side), it is determined that the manufacturing of the incomplete vibration damping device 10 has failed (NG) (S8), and the manufacturing method of the vibration damping device 10 is terminated.

[0061] Next, in process S51, the worker checks the relationship between the measurement result of the caliper 20 (width W being measured in process S4) and the allowable limit dimension of the target width. If the measurement result is greater than the upper limit (maximum allowable dimension) of the allowable limit dimension of the target width (S51: greater than the upper limit), the worker removes the caliper 20 from the vibration-damping base 13 and then grinds down only the end face 15 of the vibration-damping base 13 that the second protrusion 26 was in contact with, all around its circumference, using a rotary tool or the like (S52, second grinding process).

[0062] Afterward, the worker returns to process S4, measures the width W with the caliper 20, and then performs processes S61 and S51 again. Note that whether or not marks A and B coincide in process S61 does not depend on the distance from the end face 15 to mark A, so by machining only the end face 15 in S52, the state in which marks A and B coincide in the subsequent S61 (S61: coincidence) can be maintained.

[0063] The end face 15 is machined by repeating steps S4 to S52. When the measurement result of the caliper 20 falls within the allowable limit dimension of the target width (S51: within range), the operator determines that the machining of the vibration damping device 10 is complete (OK) (S7), and the manufacturing method of the vibration damping device 10 is terminated. If the measurement result in the first step S51 falls within the allowable limit dimension of the target width (S51: within range), step S52 can be skipped and step S7 can be performed.

[0064] In contrast, if the measurement result in process S51 is smaller than the lower limit (minimum allowable dimension) of the allowable limit dimension of the target width (S51: smaller than the lower limit), even if the end face 15 is machined, the width W cannot be brought within the range of the allowable limit dimension of the target width. In this case, the operator determines that the machining has failed in process S8 and terminates the manufacturing method of the vibration isolation device 10. The machining failure is caused by over-machining of the end face 15 through the repetition of processes S4 to S52, or by the fact that the unfinished vibration isolation device 10 had dimensions that could not be machined according to the design values ​​from the beginning.

[0065] According to the manufacturing method of the vibration isolation device 10 described above, the end faces 14 and 15 can be machined by repeating steps S4 to S52 until marks A and B coincide (S61: coincide) and the measurement result of the caliper 20 falls within the allowable limit dimension of the target width (S51: within the range). As a result, a vibration isolation device 10 can be easily manufactured in which the width W of the vibration isolation base 13 falls within the allowable limit dimension of the target width, and the center position P3 of the width W of the vibration isolation base 13 approximately coincides with the target position.

[0066] Furthermore, in step S62, if marks A and B do not coincide, only the end face 14 is machined, and the end face 15, which does not affect their alignment, is not machined. This prevents the machining failure in step S8, which occurs when the width W of the vibration-damping base 13 becomes smaller than the minimum allowable dimension of the target width in the subsequent step S51, due to machining the end face 15 in an attempt to align marks A and B.

[0067] Furthermore, in step S52, which follows the alignment of marks A and B, only the end face 15 is machined, while the end face 14 is not machined. This allows the width from the target position (mark A) to the end face 14 to be approximately equal to half the target width, while also allowing the width from the target position to the end face 15 to be approximately equal to half the target width. As a result, a vibration isolation device 10 can be manufactured more easily, in which the width W remains within the allowable limit of the target width, and the center position P3 and the target position are approximately aligned.

[0068] Furthermore, in the manufacturing method of the vibration isolation device 10, it is preferable to measure the width W, etc., at multiple locations in the circumferential direction of the vibration isolation base 13, similar to the method for confirming the displacement of the vibration isolation device 10. Specifically, in step S61, when marks A and B coincide at all of the multiple locations in the circumferential direction where the width W is measured (S61: coincidence), the process proceeds to step S51. In step S51, when the measurement result of the caliper 20 falls within the allowable limit dimension of the target width at all of the multiple locations in the circumferential direction where the width W is measured (S51: within range), the process proceeds to step S7.

[0069] Next, a second embodiment will be described with reference to Figure 5(a). Figure 5(a) is a front view of the caliper 50 and vibration isolation device 40 in the second embodiment. In the second embodiment, parts identical to those in the first embodiment are denoted by the same reference numerals and their descriptions are omitted below.

[0070] The vibration isolation device 40 differs from the vibration isolation device 10 of the first embodiment in that the center position P3 of the width W of the vibration isolation base 13 is located closer to the end face 14 of the vibration isolation base 13 than the center positions P1 and P2 of the inner member 11 and outer member 12. That is, the end face 15 of the vibration isolation base 13 of the vibration isolation device 40 is more deeply recessed in the direction of the axis C compared to the first embodiment. Otherwise, it is configured substantially the same as the vibration isolation device 10.

[0071] Compared to the caliper 20 of the first embodiment, the caliper 50 has a larger protrusion of the second projection 26 so that the tip 26a of the second projection 26 can contact the deeply recessed end face 15. Otherwise, it is configured substantially the same as the caliper 20.

[0072] Since the vibration isolation device 40 and caliper 50 are almost identical to those in the first embodiment, the method for checking the displacement of the vibration isolation device 40 and the method for manufacturing the vibration isolation device 40 are also identical to those in the first embodiment, with a few exceptions. Below, only the differences from the first embodiment will be described.

[0073] In step S2 of the second embodiment, the worker calculates the distance from the end of the outer member 12 in the direction of axis C to the target position based on, for example, a product specification or a requirements specification, and marks a dot-shaped mark A indicating the target position on the outer surface of the outer member 12 using a marker or the like. It is preferable to place these dot-shaped marks A at multiple locations in the circumferential direction on the outer surface of the outer member 12 so that the approximate coincidence or deviation between the center position P3 and the target position can be measured at multiple locations in the circumferential direction.

[0074] In step S3 of the second embodiment, as in the first embodiment, a mark B is made with adhesive tape 51 on the main scale 21 of the caliper 20 at the position indicated by the measurement result of the caliper 20, which is half the target width. Therefore, in the second embodiment as in the first embodiment, the approximate agreement or misalignment between the center position P3 and the target position can be easily confirmed by the misalignment confirmation method shown in Figure 3. In addition, a vibration isolation device 40 in which the center position P3 and the target position approximately coincide can be easily manufactured by the manufacturing method shown in Figure 4.

[0075] In the second embodiment, the mark B on the main scale 21 is formed by a strip of adhesive tape 51 having the same width as the tolerance, which is the difference between the maximum and minimum allowable dimensions of the target width (the sum of the upper and lower tolerances). The side edge of this adhesive tape 51 on the first jaw 23 side is located at a position shifted by the lower tolerance from the position indicated by the measurement result of the caliper 20, which is half the target width. The side edge of the adhesive tape 51 on the second jaw 24 side is located at a position shifted by the upper tolerance from the position indicated by the measurement result of the caliper 20, which is half the target width.

[0076] In the second embodiment, when mark A is located inside the longitudinal direction L of the adhesive tape 51, the worker can determine that mark A and mark B coincide. In this way, when one of marks A and B is dot-shaped or linear and the other is strip-shaped, the worker's judgment of coincidence or misalignment with marks A and B can be made less erratic compared to when both are linear or dot-shaped.

[0077] Next, a third embodiment will be described with reference to Figure 5(b). Figure 5(b) is a front view of the caliper 50 and vibration isolation device 40 in the third embodiment. In the third embodiment, parts that are the same as those in the first and second embodiments are denoted by the same reference numerals and their descriptions are omitted below.

[0078] The caliper 50 and vibration damping device 40 of the third embodiment are configured identically to those of the second embodiment. The third embodiment is substantially the same as the second embodiment except for the way marks A and B are applied (processes S2 and S3).

[0079] In step S2 of the third embodiment, the worker marks a mark A at the center position P2 in the direction of axis C on the outer circumferential surface of the outer member 12. Mark A is formed by a strip of adhesive tape 52 having the same width as the tolerance of the target width. The side edge of the adhesive tape 52 on the first jaw 23 side is located at a position shifted toward the first jaw 23 by a tolerance below the center position P2. The side edge of the adhesive tape 52 on the second jaw 24 side is located at a position shifted toward the second jaw 24 by a tolerance above the center position P2.

[0080] Note that this center position P2 (the widthwise center of mark A) is located at a position shifted by a predetermined dimension D toward the second jaw 24 from the target position based on the product specifications or requirements specifications. In step S3 of the third embodiment, the worker marks mark B on the main scale 21 of the caliper 50 to compensate for this shift. Specifically, mark B is marked in the direction in which the widthwise center of mark A is shifted from the target position (towards the second jaw 24), by the amount of the shift (predetermined dimension D), at a position shifted from the position indicated by the measurement result of the caliper 20 (the dashed line in Figure 5(b)) by half the target width. This mark B is a line drawn on the main scale 21 with a marker or the like.

[0081] In this third embodiment, marked with A and B, the approximate coincidence or misalignment between the center position P3 and the target position can be easily confirmed using the misalignment confirmation method shown in Figure 3, similar to the first and second embodiments. In addition, the vibration isolation device 40 in which the center position P3 and the target position approximately coincide can be easily manufactured using the manufacturing method shown in Figure 4.

[0082] In the third embodiment, since the mark A can be placed on the outer member 12 regardless of the target position, the workability of the method for checking the misalignment of the vibration isolation device 40 and the manufacturing method can be improved, depending on various other circumstances. In particular, in the third embodiment, the workability can be improved when the mark A is placed using the marking jigs 60 and 70 described later.

[0083] Next, the fourth embodiment will be described with reference to Figures 6(a) and 6(b). Figure 6(a) is a top view of the marking jig 60 and vibration isolation device 10 in the fourth embodiment. Figure 6(b) is a front view of the marking jig 60 and vibration isolation device 10 in the direction of arrow VIb in Figure 6(a). In the fourth embodiment, parts identical to those in the first to third embodiments are denoted by the same reference numerals and their descriptions are omitted below.

[0084] The marking jig 60 is a jig used in the method for checking the misalignment of the vibration isolation device 10 and in the manufacturing method for attaching a mark A to the outer member 12 in step S2, instead of using adhesive tape 31. The marking jig 60 comprises a base 61, an end wall 62 that rises vertically upward from the upper surface 61a of the base 61, a side wall 63 that rises vertically from the base 61 and the end wall 62, and a plate-shaped mark-forming part 64 attached to the upper end of the side wall 63.

[0085] The side wall 63 is formed to a height approximately the same as the diameter of the vibration isolation device 10 (outer member 12). The end wall 62 is formed to a height approximately half that of the side wall 63 and has a planar end contact surface 62a that is perpendicular to the side wall 63 and the upper surface 61a. The mark forming portion 64 is fixed to the upper end of the side wall 63 with a hinge 64a so that it can rotate parallel to the end contact surface 62a.

[0086] In step S2, the worker first sets the vibration isolation device 10 in the marking jig 60 by bringing the outer surface of the outer member 12 of the vibration isolation device 10 into contact with the upper surface 61a of the base 61 and the side wall 63, while bringing one end of the inner member 11 in the direction of axis C into contact with the end contact surface 62a. With the device set in this position, the mark forming section 64, which has been raised in advance as shown by the dashed line in Figure 6(b), is lowered, and the mark forming section 64 is brought into contact with the outer member 12 as shown by the solid line.

[0087] The mark-forming section 64 is fixed such that the distance in the axial direction C from the end contact surface 62a to the side edge of the mark-forming section 64 on the end contact surface 62a side is the same as the distance from one end of the inner member 11 in contact with the end contact surface 62a to the target position in the axial direction C. Therefore, when the vibration isolation device 10 is set on the marking jig 60 and the mark-forming section 64 is brought into contact with the outer member 12, the side edge of the mark-forming section 64 on the end contact surface 62a side indicates the target position. That is, the side edge of the mark-forming section 64 becomes mark A and is attached to the outer circumferential surface of the outer member 12.

[0088] With this marking jig 60, each time multiple vibration isolation devices 10 are set in the marking jig 60 in sequence, a mark A can be easily made on the outer circumferential surface of the outer member 12 at the same distance from the part that contacts the end contact surface 62a. As a result, for example, when making marks A on multiple similar vibration isolation devices 10 during inspection work, the process of making the marks A can be simplified by using the marking jig 60.

[0089] Furthermore, in the marking jig 60, the space in which the vibration isolation device 10 is set is enclosed on three sides by the base 61, end wall 62, and side wall 63, but the other three sides are open. Therefore, the degree of freedom in the dimensions of the vibration isolation device 10 that can be set in that space can be improved. Moreover, since the mark forming section 64 is fixed so as to be rotatable by the hinge 64a, the mark forming section 64 can be brought into contact with vibration isolation devices 10 of various dimensions and marks A can be made. As a result of the above, the versatility of the marking jig 60 can be improved.

[0090] Next, the fifth embodiment will be described with reference to Figure 6(c). Figure 6(c) is a cross-sectional view of the marking jig 70 and vibration isolation device 10 in the fifth embodiment. In the fifth embodiment, parts identical to those in the first to fourth embodiments are denoted by the same reference numerals and their descriptions are omitted below.

[0091] The marking jig 70, like the marking jig 60 of the fourth embodiment, is a jig used in the method for checking the misalignment of the vibration isolation device 10 and in the manufacturing method to mark mark A on the outer member 12 in step S2. The marking jig 70 comprises a cylindrical portion 71 having an inner diameter approximately the same as the outer diameter of the outer member 12, and an annular protrusion 72 that extends radially inward in a stepped manner from one end of the cylindrical portion 71. The step between the cylindrical portion 71 and the protrusion 72 forms an end contact surface 73. In addition, a planar mark forming portion 74 is formed by the end face of the cylindrical portion 71 opposite to the protrusion 72.

[0092] In step S2, the worker inserts the outer member 12 into the cylindrical portion 71 until one end of the outer member 12 in the direction of axis C contacts the end contact surface 73, thereby setting the vibration isolation device 10 in the marking jig 70. The mark forming portion 74 is fixed so that the distance from the end contact surface 73 to the mark forming portion 74 in the direction of axis C is the same as the distance from one end of the outer member 12 in the direction of axis C that is in contact with the end contact surface 73 to the target position.

[0093] Therefore, in the fifth embodiment, as in the fourth embodiment, by setting the vibration isolation device 10 in the marking jig 70, the mark-forming portion 74 becomes a mark A and is attached to the outer circumferential surface of the outer member 12. Accordingly, according to the fifth embodiment, as in the fourth embodiment, when attaching marks A to multiple similar vibration isolation devices 10, for example, in inspection work, the process of attaching the marks A can be simplified by using the marking jig 70. Furthermore, with the marking jig 70, the marks A can be attached simply by inserting the outer member 12 into the cylindrical portion 71, thus further simplifying the process of attaching the marks A.

[0094] Next, the sixth embodiment will be described with reference to Figure 7(a). Figure 7(a) is a partial cross-sectional view of the caliper 80 in the sixth embodiment. In the sixth embodiment, parts that are the same as those in the first to fifth embodiments are denoted by the same reference numerals and their descriptions are omitted below.

[0095] The caliper 80 is a measuring instrument suitable for measuring the width W of the vibration-damping base 13. The caliper 80 is a general-purpose caliper equipped with a main scale 21, a slider 22, a first jaw 23, and a second jaw 24, which has been modified to provide a first protrusion 81 and a second protrusion 82. The first protrusion 81 is formed by fitting a bolt 25b into a screw hole 83 provided along the longitudinal direction L in the first jaw 23. The second protrusion 82 is formed by fitting a bolt 26b into a screw hole 84 provided along the longitudinal direction L in the second jaw 24.

[0096] The screw hole 83 has a bottom surface 83a on the outer surface 23b side of the first jaw 23 and opens only on the inner surface 23a. The screw hole 84 has a bottom surface 84a on the outer surface 24b side of the second jaw 24 and opens only on the inner surface 24a. Similar to the first embodiment, internal threads F are formed on the inner circumferential surfaces of these screw holes 83 and 84 along their entire length in the longitudinal direction L.

[0097] To form the first protrusion 81, the bolt 25b is rotated so that the male thread M of the shaft portion 25c of the bolt 25b fits into the female thread F of the screw hole 83. At this time, the bolt 25b is rotated until the end of the shaft portion 25c opposite to the head portion 25d (the other end) hits the bottom surface 83a. When the other end of the shaft portion 25c hits the bottom surface 83a, the part of the bolt 25b on the head portion 25d side that protrudes from the inner surface 23a becomes the first protrusion 81.

[0098] To form the second protrusion 82, the bolt 26b is rotated so that the male thread M of the shaft portion 26c of the bolt 26b fits into the female thread F of the screw hole 84. At this time, the bolt 26b is rotated until the end of the shaft portion 26c opposite to the head portion 26d (the other end) hits the bottom surface 84a. When the other end of the shaft portion 26c hits the bottom surface 84a, a part of the bolt 26b on the head portion 26d side that protrudes from the inner surface 24a becomes the second protrusion 82.

[0099] With this caliper 80, similar to the caliper 20 of the first embodiment, the configuration for providing the first protrusion 81 and the second protrusion 82 on the first jaw 23 and the second jaw 24 can be simplified. Furthermore, in the caliper 80, the tip 81a of the first protrusion 81 that abuts against the end face 14 of the vibration-damping base 13 is formed by the head 25d, and the tip 82a of the second protrusion 82 that abuts against the end face 15 of the vibration-damping base 13 is formed by the head 26d. As a result, the tips 81a and 82a can be made wider compared to the case where the tips 81a and 82a are shaft portions 25c and 26c. Consequently, the contact area between the end faces 14 and 15, which are the bottoms of the recesses of the object to be measured, and the tips 81a and 82a can be increased, thus stabilizing the contact and improving measurement accuracy.

[0100] Furthermore, in the caliper 80, when the shafts 25c and 26c are fitted into the screw holes 83 and 84, the other ends of the shafts 25c and 26c are pressed against the bottom surfaces 83a and 84a of the screw holes 83 and 84 by axial force. This suppresses the rotation of the bolts 25b and 26b, and prevents fluctuations in the amount of protrusion of the first protrusion 81 and the second protrusion 82 from the inner surfaces 23a and 24a during measurement, which would otherwise cause fluctuations in the measurement results.

[0101] Next, the seventh embodiment will be described with reference to Figure 7(b). Figure 7(b) is a partial cross-sectional view of the caliper 90 in the seventh embodiment. In the seventh embodiment, parts identical to those in the first to sixth embodiments are denoted by the same reference numerals and their descriptions are omitted below.

[0102] The caliper 90 is an addition of screw holes 91, 92, 93, and 94 to the caliper 20 in the first embodiment. The screw holes 91, 92, 93, and 94 are formed along the longitudinal direction L, and internal threads F are formed on the inner circumferential surface. The screw holes 91 and 92 open to the inner surface 23a and outer surface 23b of the first jaw 23. The screw holes 93 and 94 open to the inner surface 24a and outer surface 24b of the second jaw 24.

[0103] Screw hole 91 is located closer to the main scale 21 than screw hole 23c and has a larger inner diameter than screw hole 23c. Screw hole 92 is located closer to the main scale 21 than screw hole 91 and has a larger inner diameter than screw hole 91. Screw hole 93 is located closer to the slider 22 than screw hole 24c and has a larger inner diameter than screw hole 24c. Screw hole 94 is located closer to the slider 22 than screw hole 93 and has a larger inner diameter than screw hole 93.

[0104] In this way, the caliper 90 has multiple screw holes 23c, 24c, 91, 92, 93, and 94 of different types arranged in the short direction S on the first jaw 23 and the second jaw 24. This allows the first protrusion 25 and the second protrusion 26 to be formed with different types of bolts 25b and 26b corresponding to each screw hole 23c, 24c, 91, 92, 93, and 94. Therefore, the first protrusion 25 and the second protrusion 26 inserted into the recess (near the end faces 14 and 15) of the object to be measured can be selectively changed according to the shape of the recess and the purpose of measurement, making it possible to perform various measurements with a single caliper 90.

[0105] For example, instead of fitting bolts 25b and 26b into screw holes 23c and 24c, fitting suitable bolts 95 and 96 into screw holes 92 and 94 allows the first protrusion 97 and the second protrusion 98 to be made thicker. This increases the contact area between the end face 14, which is the bottom of the recess of the object being measured, and the tip 97a of the first protrusion 97, and the contact area between the end face 15 and the tip 98a of the second protrusion 98, thereby stabilizing the contact and improving measurement accuracy.

[0106] On the other hand, if the first protrusion 25 and second protrusion 26 are formed by bolts 25b and 26b, even if the recess between the inner member 11 and the outer member 12 is relatively narrow, the tips 25a and 26a of the first protrusion 25 and second protrusion 26 can be easily brought into contact with the end faces 14 and 15, which are the bottom of the recess, respectively. Furthermore, by forming the first and second protrusions with bolts fitted into screw holes 91 and 93, the first and second protrusions can be easily brought into contact with the end faces 14 and 15 at the bottom of recesses where the first and second protrusions 97 and 98 cannot be inserted. Moreover, the first and second protrusions formed by bolts fitted into screw holes 91 and 93 can stabilize contact with the end faces 14 and 15 more than the first and second protrusions 25 and second protrusions 26.

[0107] Here, if the tip 25a of a bolt 25b, etc., which is fitted into a screw hole 23c, etc., is a flat surface, the larger the outer diameter of the bolt 25b, etc., the greater the contact area between the tip 25a, etc., and the end faces 14, 15 (object to be measured), and the easier it is for a large force to be applied to the end faces 14, 15. The larger such force is applied to the tip side of the first jaw 23 and the second jaw 24 (the side away from the main scale 21), the easier it is for the first jaw 23 and the second jaw 24 to tilt (bend) relative to the main scale 21, which may reduce the measurement accuracy of the caliper 90.

[0108] In contrast, in this embodiment, the multiple screw holes 23c, 24c, 91, 92, 93, and 94 are arranged such that their inner diameters become smaller towards the tip of the first jaw 23 and the second jaw 24. As a result, the outer diameter of bolts 25b, etc., fitted into the screw holes 23c, etc., becomes smaller towards the tip of the first jaw 23 and the second jaw 24. Consequently, bolts 25b, etc., that are more likely to experience greater forces on their end faces 14 and 15 are located closer to the main scale 21, making it less likely for the first jaw 23 and the second jaw 24 to tilt relative to the main scale 21. Therefore, a decrease in the measurement accuracy of the caliper 90 caused by this tilt can be suppressed.

[0109] Next, the eighth embodiment will be described with reference to Figure 7(c). Figure 7(c) is a partial cross-sectional view of the caliper 100 and the object to be measured 101 in the eighth embodiment. In the eighth embodiment, parts that are the same as those in the first to seventh embodiments are denoted by the same reference numerals and their descriptions are omitted below.

[0110] The caliper 100 is modified from the caliper 20 in the first embodiment by shifting the position of the screw hole 24c toward the slider 22. As a result, the second protrusion 26 formed by the bolt 26b fitted into the screw hole 24c and the first protrusion 25 are offset from each other in the shorter direction S.

[0111] Such a caliper 100 is suitable for measuring, for example, when a pair of recesses 103 and 104, each formed on both sides of the longitudinal direction L of an object to be measured 101, are offset in the short direction S. With the caliper 100, the width W between the bottoms 105 and 106 can be easily measured by bringing the tip 25a of the first protrusion 25 into contact with the bottom 105 of the recess 103 and the tip 26a of the second protrusion 26 into contact with the bottom 106 of the recess 104. Such a measurement method can also be achieved, for example, by forming the first protrusion 25 and the second protrusion 98 in the caliper 90 of the seventh embodiment.

[0112] Next, the ninth embodiment will be described with reference to Figure 7(d). Figure 7(d) is a partial cross-sectional view of the caliper 110 in the ninth embodiment. In the ninth embodiment, parts identical to those in the first to eighth embodiments are denoted by the same reference numerals and their descriptions are omitted below.

[0113] The caliper 110 is modified from the caliper 20 in the first embodiment by forming the first protrusion 25 and the second protrusion 26 with parts of the stud bolts 111 and 114, while replacing the screw hole 24c with a through hole 113. The stud bolts 111 and 114 are formed only of a shaft portion with an external thread M formed on its outer circumference, and do not have a head. The through hole 113 is a hole that opens on the inner surface 24a and the outer surface 24b of the second jaw 24, and is formed along the longitudinal direction L. The inner diameter of this through hole 113 is larger than the outer diameter of the stud bolt 114, and no internal thread is formed on its inner circumference.

[0114] To form the first protrusion 25, first, the male thread M of the stud bolt 111 is fitted into the female thread F of the threaded hole 23c of the first jaw 23 so that the stud bolt 111 protrudes from both sides in the longitudinal direction L from the first jaw 23. Next, the nut 112 is fitted onto the stud bolt 111 until it touches the outer surface 23b. As a result, the stud bolt 111 is fixed to the first jaw 23 by axial force, and the portion of the stud bolt 111 that protrudes from the inner surface 23a becomes the first protrusion 25.

[0115] To form the second protrusion 26, first, the stud bolt 114 is inserted into the through hole 113 of the second jaw 24 so that the stud bolt 114 protrudes from both sides in the longitudinal direction L from the second jaw 24. Next, the nuts 115 and 116 are fitted onto the stud bolt 114 from both sides until the nut 115 touches the inner surface 24a and the nut 116 touches the outer surface 24b. As a result, the stud bolt 114 is fixed to the second jaw 24 by axial force, and the portion of the stud bolt 114 that protrudes from the inner surface 24a becomes the second protrusion 26. Alternatively, either the nut 115 or 116 may be fitted onto the stud bolt 114 first, and then the stud bolt 114 may be inserted into the through hole 113. Also, the stud bolt 114 and nut 116 may be replaced with a bolt 26b or the like in the first embodiment.

[0116] In this way, the second protrusion 26 can be formed simply by inserting stud bolts 114 or bolts 26b into the through holes 113 provided in the second jaw 24 and fitting nuts 115 and 116 onto them. Therefore, the configuration for providing the second protrusion 26 on the second jaw 24 can be simplified. The first protrusion 25 may be configured in a similar manner.

[0117] When the first protrusion 25 and the second protrusion 26 are formed with stud bolts 111 and 114, the positions of the nuts 112, 115, and 116 relative to the stud bolts 111 and 114 can be easily shifted in the longitudinal direction L. As a result, the amount of protrusion of the stud bolts 111 and 114 from the inner surfaces 23a and 24a can be easily adjusted, that is, the amount of protrusion of the first protrusion 25 and the second protrusion 26 can be easily adjusted.

[0118] Here, when the tips 25a and 26a of the first protrusion 25 and the second protrusion 26 are brought into contact with the bottom (end faces 14 and 15) of the recess of the object to be measured, it is preferable to reduce the gap in the longitudinal direction L between the first jaw 23 and the second jaw 24 and the object to be measured (vibration isolation device 10). That is, it is preferable to minimize the amount of protrusion of the first protrusion 25 and the second protrusion 26 so that the tips 25a and 26a come into contact with the bottom of the recess of the object to be measured, while the first jaw 23 and the second jaw 24 do not come into contact with the object to be measured.

[0119] If the protrusion of the first protrusion 25 and the second protrusion 26 is too large, they are more likely to bend in the shorter direction S when measuring the width W, and this bending may cause inconsistencies in the measurement results of the width W. In contrast, by minimizing the protrusion of the first protrusion 25 and the second protrusion 26, bending of the first protrusion 25 and the second protrusion 26 can be suppressed, improving the measurement accuracy of the caliper 110, etc.

[0120] Next, the tenth embodiment will be described with reference to Figure 8(a). Figure 8(a) is a partial cross-sectional view of the caliper 130 and vibration isolation device 120 in the tenth embodiment. In the tenth embodiment, parts that are the same as those in the first to ninth embodiments are denoted by the same reference numerals and their descriptions are omitted below.

[0121] The vibration isolation device 120 is modified from the vibration isolation device 10 of the first embodiment by increasing the width of the inner member 11 toward the first jaw 23. The caliper 130 is modified from the caliper 20 of the first embodiment by increasing the protrusion amount of the first convex portion 25 so that when the first convex portion 25 is brought into contact with the end face 14 of the vibration isolation base 13 of the vibration isolation device 120, the first jaw 23 does not come into contact with the inner member 11.

[0122] Thus, compared to the first embodiment, the amount of protrusion of the first protrusion 25 is increased in accordance with the enlargement of the inner member 11 on the first jaw 23 side, but the amount of protrusion of the second protrusion 26 is not increased on the second jaw 24 side, which remains unchanged, thereby minimizing their protrusion amounts. More specifically, when the first protrusion 25 and the second protrusion 26 contact the end faces 14 and 15 respectively, the distances from the first jaw 23 and the second jaw 24 to the inner member 11 are made approximately the same, thereby minimizing the protrusion amounts of the first protrusion 25 and the second protrusion 26. As a result, as described in the ninth embodiment, bending of the first protrusion 25 and the second protrusion 26 can be suppressed, and the measurement accuracy of the caliper 130 can be improved.

[0123] Next, the 11th embodiment will be described with reference to Figure 8(b). Figure 8(b) is a partial cross-sectional view of the caliper 140 and the object to be measured 141 in the 11th embodiment. In the 11th embodiment, parts that are the same as those in the 1st to 10th embodiments are denoted by the same reference numerals and their descriptions are omitted below.

[0124] The caliper 140 is a modification of the caliper 20 of the first embodiment, with the second protrusion 26, screw hole 24c, and bolt 26b omitted. Such a caliper 140 is suitable for measurements when, for example, a recess 142 is formed on only one side of the longitudinal direction L of the object to be measured 141, and the other side is exposed as a flat surface 144 or the like.

[0125] According to the caliper 140, the width W between the bottom 143 and the flat surface 144 can be easily measured by bringing the tip 25a of the first protrusion 25 into contact with the bottom 143 of the recess 142 and bringing the inner surface 24a of the second jaw 24 into contact with the flat surface 144. This is also true when, in contrast to the caliper 20 of the first embodiment, the first protrusion 25, screw hole 23c and bolt 25b are omitted instead of the second protrusion 26, screw hole 24c and bolt 26b.

[0126] Next, the twelfth embodiment will be described with reference to Figure 8(c). Figure 8(c) is a partial cross-sectional view of the caliper 150 in the twelfth embodiment. In the twelfth embodiment, parts identical to those in the first to eleventh embodiments are denoted by the same reference numerals and their descriptions are omitted below.

[0127] The caliper 150 is modified from the caliper 20 of the first embodiment by changing the shape of the tip 151 of the first protrusion 25 and the tip 152 of the second protrusion. The tip 151 of the first protrusion 25 is formed in a frustoconical shape, comprising a flat surface smaller than the outer diameter of the shaft portion 26c and a tapered surface that tapers in diameter from the periphery of the flat surface toward the head portion 25d.

[0128] This makes it easier to bring the flat surface of the tip 151 into contact with the central part of the end face 14 of the vibration-damping base 13, even if the end face 14 of the vibration-damping base 13 is inclined outward in the axial direction C from the radial central part toward the inner member 11 or outer member 12. This suppresses the tip 151 from partially lifting away from the end face 14, thereby improving the measurement accuracy of the caliper 150. Furthermore, since mainly the flat surface of the tip 151 contacts the end face 14, the caliper 150 is less likely to tilt relative to the end face 14, further improving the measurement accuracy of the caliper 150. This is true not only for the end face 14 but also for other objects to be measured.

[0129] The tip 152 of the second protrusion 26 is formed in a conical shape. This allows the tip 152 to make pinpoint contact with a part of the end face 15. Therefore, the tip 152 can suppress partial lifting from the end face 15 more effectively than the tip 151, thereby improving the measurement accuracy of the caliper 150. This is true not only for the end face 15 but also for other objects to be measured.

[0130] Furthermore, by bringing the flat tip 151 (or tip 25a) into contact with one side of the object being measured in the longitudinal direction L, while bringing the conical tip 152 into contact with the other side, it is possible to suppress the tilt of the caliper 150 with the flat surface and achieve pinpoint contact with the tip 152. As a result, the measurement accuracy of the caliper 150 can be further improved.

[0131] Next, the 13th embodiment will be described with reference to Figure 8(d). Figure 8(d) is a partial cross-sectional view of the caliper 160 in the 13th embodiment. In the 13th embodiment, parts identical to those in the 1st to 12th embodiments are denoted by the same reference numerals and their descriptions are omitted below.

[0132] The caliper 160 differs from the caliper 20 of the first embodiment in the method of forming the first protrusion 161 and the second protrusion 162. The first jaw 23 of the caliper 160 has through holes 163 that open to the inner surface 23a and the outer surface 23b, respectively, and are formed through the longitudinal direction L. No internal threads are formed on the inner circumferential surface of the through holes 163. By press-fitting the shaft member 161a into these through holes 163, a part of the shaft member 161a protrudes from the inner surface 23a, and this protruding part becomes the first protrusion 161.

[0133] Similarly, the second jaw 24 of the caliper 160 has through holes 164 that open into the inner surface 24a and the outer surface 24b, respectively, extending in the longitudinal direction L. No internal threads are formed on the inner circumferential surface of these through holes 164. By press-fitting the shaft member 162a into these through holes 164, a portion of the shaft member 162a protrudes from the inner surface 24a, and this protruding portion becomes the second convex portion 162.

[0134] As described above, with the caliper 160, the first protrusion 161 and the second protrusion 162 can be formed simply by press-fitting the shaft members 161a and 162a into the through holes 163 and 164 provided in the first jaw 23 and the second jaw 24. As a result, the configuration for providing the first protrusion 161 and the second protrusion 162 in the first jaw 23 and the second jaw 24 can be simplified.

[0135] Furthermore, the inner circumferential surfaces of the through holes 163 and 164 and the outer circumferential surfaces of the shaft members 161a and 162a, which come into close contact with each other during press-fitting, are both formed in a tapered shape that narrows in diameter towards the tips 25a and 26a of the first and second protrusions 161 and 162, respectively. This makes it easier for the shaft members 161a and 162a to move outward in the opposing direction of the pair of first jaws 23 and second jaws 24 when the tips 25a and 26a attempt to bite into the object being measured (end faces 14 and 15) during measurement with the caliper 160. This makes it more difficult for the tips 25a and 26a to bite into the object being measured, thereby suppressing the decrease in measurement accuracy of the caliper 160 due to such biting. In this case, the zero point will be shifted compared to before measurement, so it is necessary to correct the measurement result based on the value of the display unit 22a when the tips 25a and 26a are brought into contact after measurement.

[0136] Although the present invention has been described above based on embodiments, it can be easily inferred that the present invention is not limited in any way to the above embodiments, and that various improvements and modifications are possible without departing from the spirit of the present invention. For example, the shape, dimensions, etc. of each part of the calipers 20, 50, 80, 90, 100, 110, 130, 140, 150, 160 (hereinafter referred to as "caliper 20, etc.") may be changed as appropriate.

[0137] In the above embodiment, a case was described in which a general digital caliper is modified to form the caliper 20, etc., but it is not necessarily limited to this. The caliper 20, etc., may be a custom-made product. Alternatively, an analog caliper may be modified to form the caliper 20, etc.

[0138] In the above embodiment, a case in which a caliper 20 or the like is used for checking the displacement and manufacturing method of the vibration isolation devices 10, 40, and 120 has been described, but it is not necessarily limited to this. Any measuring instrument other than a caliper 20 or the like can be used as long as it is possible to measure the width W of the vibration isolation base 13 recessed in the axial direction C between the inner member 11 and the outer member 12. Examples of such measuring instruments include a micrometer and the measuring instrument described in Japanese Patent Publication No. 63-165702.

[0139] In the above embodiment, the case where the vibration isolation devices 10, 40, and 120 are vibration isolation bushings has been described, but this is not necessarily the only case. The vibration isolation devices 10, 40, and 120 may also be body mounts, dynamic dampers, torque rods, etc. Furthermore, the caliper 20, etc., may be used to measure objects other than the vibration isolation devices 10, 40, and 120.

[0140] Some configurations of the above embodiments may be applied to other embodiments. For example, at least some of the multiple screw holes 23c, 24c, 91, 92, 93, 94 in the seventh embodiment may be screw holes 83, 84 having bottom surfaces 83a, 84a, as in the sixth embodiment. Also, at least some of the multiple screw holes 23c, 24c, 91, 92, 93, 94 may be through holes 113, 163, 164, as in the ninth and thirteenth embodiments. The order (position) of these multiple screw holes 23c, 24c, 83, 84, 91, 92, 93, 94 and through holes 113, 163, 164 may be changed as appropriate in the short-side direction S.

[0141] The tips 25a, 26a, 97a, and 98a of the first protrusions 25, 97, and 161 and the second protrusions 26, 98, and 162 in each embodiment may be frustoconical in shape, as in tip 151 in the twelfth embodiment, or conical in shape, as in tip 152. Furthermore, the tips 25a, 26a, 97a, and 98a may be hemispherical, pyramidal, or pyramidal in shape. The shapes of the tips 25a, etc. on the first jaw 23 side and the tips 26a, etc. on the second jaw 24 side may be the same or different.

[0142] In the above embodiment, the manufacturing method of the vibration isolation device 10 shown in Figure 4 was described in which step S51 is performed when marks A and B coincide in step S61 (S61: coincidence), but it is not necessarily limited to this. For example, the order of steps S51 and S61 may be reversed, or they may be performed simultaneously. In these cases, both end faces 14 and 15 may be machined at approximately the same time, or only one of them may be machined, until marks A and B coincide (S61: coincidence) and the measurement result of the caliper 20 is within the allowable limit dimension of the target width (S51: within the range). Furthermore, in steps S52 and S62, both end faces 14 and 15 may be machined at approximately the same time, rather than only one of them. [Explanation of Symbols]

[0143] 10,40,120 Vibration Isolator 11 Inner member 12 Outer member 13 Vibration Isolation Base 14,15 End faces (both ends) 20, 50, 80, 90, 100, 110, 130, 140, 150, 160 Caliper (measuring instrument) 21 main shaku 22 Sliders 23 First Jaw 24 Second Joe 25,81,97,161 First protrusion 26,82,98,162 Second convex part 60, 70 Marking jigs 62a,73 End contact surface 64,74 Mark forming part Mark A (Vibration-damping side mark) Mark B (measurement side mark) P2 Center position of the outer member P3 Center position of the vibration isolation base W width S2 Vibration-damping side marking process S4 Clamping process S5 Part of the verification process S6 Part of the verification process S51 Part of the verification process S52 2nd cutting process S61 Part of the verification process S62 1st cutting process

Claims

1. A method for confirming the misalignment of a vibration isolation device, wherein the outer circumferential surface of an axial inner member and the inner circumferential surface of a cylindrical outer member are connected by an elastic vibration isolation base, and the axial end faces of the vibration isolation base are recessed relative to both axial ends of the outer member, the method for confirming the misalignment of the center position of the width between the end faces of the vibration isolation base and a predetermined target position, wherein A vibration-damping marking step involves marking the outer surface of the outer member with a vibration-damping mark indicating the target position, A measuring instrument capable of measuring the width by clamping the vibration-damping base from both sides in the axial direction, wherein the measuring instrument has a measurement mark at a position where the measurement result indicates half of the target width, which is the design value of the width, and the clamping step of clamping the vibration-damping base, A method for confirming misalignment of a vibration isolation device, comprising: a confirmation step of confirming whether the measurement result by the measuring instrument is within the allowable limit dimension of the target width while the vibration isolation base is being held by the clamping step, and confirming the misalignment between the vibration isolation side mark made in the vibration isolation side marking step and the measurement side mark.

2. A method for confirming the misalignment of a vibration isolation device, wherein the outer circumferential surface of an axial inner member and the inner circumferential surface of a cylindrical outer member are connected by an elastic vibration isolation base, and the axial end faces of the vibration isolation base are recessed relative to both axial ends of the outer member, the method for confirming the misalignment of the center position of the width between the end faces of the vibration isolation base and a predetermined target position, wherein A vibration-damping marking step is performed in which a vibration-damping mark is placed at the axial center position on the outer circumferential surface of the outer member, A measuring instrument capable of measuring the width by clamping the vibration-damping base from both sides in the axial direction, wherein the measuring instrument has a measuring mark placed at a position shifted from the position indicated by the measurement result by the amount of the displacement between the vibration-damping mark and the target position in the direction in which the vibration-damping mark is shifted from the target position, and the measuring instrument has a clamping step of clamping the vibration-damping base, A method for checking the misalignment of a vibration isolation device, comprising: a confirmation step of checking whether the measurement result by the measuring instrument is within the allowable limit dimension of the target width while the vibration isolation base is being held by the clamping step, and checking the misalignment between the vibration isolation side mark made in the vibration isolation side marking step and the measurement side mark.

3. The vibration-damping marking step is a step of setting the vibration-damping device in a marking jig to attach the vibration-damping mark to the outer surface of the outer member. The marking jig has an end contact surface to which one end of the inner member or the outer member in the axial direction abuts, A method for confirming misalignment of a vibration damping device according to claim 1, comprising: a mark-forming portion fixed at a position axially away from the end contact surface and in contact with the outer peripheral surface of the outer member, and forming the vibration damping side mark.

4. A method for manufacturing the aforementioned vibration isolation device, comprising a method for confirming the displacement of the vibration isolation device according to any one of claims 1 to 3, If, in the verification step, it is confirmed that the measurement mark and the vibration isolation mark do not coincide, or that the measurement result of the measuring instrument is not within the allowable limit dimension of the target width, the measuring instrument is removed from the vibration isolation base, and then a grinding step is provided in which at least one of the end faces is ground down. A method for manufacturing a vibration isolation device, characterized in that, after the cutting step, the process returns to the clamping step and the confirmation step is performed.

5. The measuring instrument is a caliper in which a slider slides against a main scale, and comprises a first projection that protrudes from a first jaw fixed to the main scale and contacts one end face of the end faces during the clamping process, and a second projection that protrudes from a second jaw fixed to the slider and contacts the other end face of the end faces during the clamping process, and the main scale is marked with the measuring side mark. The method for manufacturing a vibration damping device according to claim 4, characterized in that the grinding step includes a first grinding step of grinding only the one end face that was in contact with the first protrusion when the measurement side mark is located on the first jaw side with respect to the vibration damping side mark in the confirmation step.

6. The method for manufacturing a vibration damping device according to claim 5, wherein the machining step includes a second machining step in which, if the measurement mark and the vibration damping mark coincide in the confirmation step and the measurement result of the measuring instrument is greater than the upper limit of the allowable limit dimension of the target width, only the other end face in contact with the second protrusion is machined.

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