Wear sensor and sliding device

Abstract

To provide an abrasion sensor capable of restricting a decline in installation accuracy, and a sliding device.SOLUTION: An abrasion sensor is provided in a hole extending such that one side is open to a sliding plane of an abrasive member. The abrasion sensor comprises: a holder which is inserted to the hole from the other side, and arranged at a first portion on one side of the hole; an abrasion chip which is held by the holder, and whose tip is positioned in the opening of the hole; and a fixing member which is screwed in a second portion on the other side of the hole toward the one side, and abuts on the holder from the other side.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a wear sensor and a sliding device. [Background technology]

[0002] It is known to provide an electrical wear sensor to detect wear on sliding parts of industrial machinery (see, for example, Patent Document 1). This wear sensor includes a wear detection unit that detects wear and a fitting that holds the wear detection unit inside. The wear detection unit is fixed to the fitting, which has a thread on its outer circumferential surface. The fitting is screwed into a thread groove formed on the inner circumferential surface of a hole that opens into the sliding surface of the wear member. In other words, the wear detection unit is fixed by screwing into the hole via the fitting. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-88173 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the wear sensor described in Patent Document 1, the wear detection unit is fixed by screwing into the hole, so adjusting the position of the wear detection unit in the insertion direction changes the rotational position of the wear detection unit. As a result, it is not possible to adjust the rotational position of the wear detection unit separately from the position of the wear detection unit in the insertion direction, which can result in reduced installation accuracy.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a wear sensor and a sliding device that can suppress a decrease in installation accuracy. [Means for solving the problem]

[0006] In order to solve the above problems, the wear sensor according to the present disclosure is a wear sensor provided in a hole that extends so that one side opens on a sliding surface of a wear member, and includes: a holder that is inserted into the hole from the other side and is disposed in a first portion on one side of the hole; a wear tip that is held by the holder and has a tip located in the opening of the hole; and a fixing member that is screwed toward one side into a second portion on the other side of the hole and abuts against the holder from the other side. The holder has a pair of divided bodies, each of which has a divided surface facing each other, and the pair of divided bodies sandwich and hold the wear tip between the divided surfaces, and the divided surfaces are formed with irregularities. .

[0007] A sliding device according to the present disclosure includes the above-described wear sensor, the wear member, and an opposing member that slides relative to the sliding surface of the wear member. [Effects of the Invention]

[0008] According to the wear sensor and sliding device of the present disclosure, it is possible to suppress a decrease in installation accuracy. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a cross-sectional view of a sliding device according to a first embodiment of the present disclosure. [Figure 2] FIG. 1 is a perspective view of a holder according to a first embodiment of the present disclosure. [Figure 3] FIG. 10 is an exploded perspective view of a wear sensor according to a second embodiment of the present disclosure. [Figure 4] FIG. 10 is a cross-sectional view of a sliding device according to a third embodiment of the present disclosure. [Figure 5] FIG. 11 is a cross-sectional view of a sliding device according to a modified example of the third embodiment of the present disclosure. [Figure 6] FIG. 10 is a cross-sectional view of a holder according to a fourth embodiment of the present disclosure. [Figure 7] FIG. 10 is a cross-sectional view of a holder according to a first modified example of the fourth embodiment of the present disclosure. [Figure 8] FIG. 13 is a cross-sectional view of a holder according to a second modified example of the fourth embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0010] First Embodiment (Sliding device) A sliding device 1 according to a first embodiment of the present disclosure will be described below with reference to FIGS. 1 and 2. The sliding device 1 is installed in a sliding portion of industrial machinery. The sliding device 1 includes a rotating shaft 2 as an example of an opposing member, a bearing 10 as an example of a wear member, and a wear sensor 3. The opposing member slides relative to the wear member while at least a portion of the opposing member is in contact with the wear member.

[0011] (rotation axis) As shown in FIG. 1, the rotary shaft 2 is formed in a cylindrical shape extending in one direction. Hereinafter, the radial direction of the rotary shaft 2 may be simply referred to as the "radial direction."

[0012] (bearings) The bearing 10 is a journal bearing that supports the rotating shaft 2 rotatably about a rotation axis O1 that is along the central axis of the rotating shaft 2. The bearing 10 includes a bearing body 11 and a protrusion 12. The bearing body 11 is disposed at a position radially spaced from the outer circumferential surface of the rotating shaft 2. The protrusion 12 protrudes radially from the inner circumferential surface of the bearing body 11 toward the rotating shaft 2. The inner circumferential surface of the protrusion 12 is a sliding surface 13 that comes into contact with the rotating shaft 2.

[0013] (hole) The bearing 10 is formed with a hole 14 that passes through the bearing 10 in the radial direction. The hole 14 extends so as to open on the rotating shaft 2 side. Hereinafter, the extending direction D of the hole 14 will be simply referred to as the "extending direction D." In addition, in the extending direction D, the side of the rotating shaft 2 will be referred to as the "one side," and the side opposite to the rotating shaft 2 will be referred to as the "other side."

[0014] The hole 14 has a first portion 14a, a second portion 14b, and a connecting surface 14c. The first portion 14a is on one side of the hole 14, and the second portion 14b is on the other side of the hole 14. The connecting surface 14c is provided between the first portion 14a and the second portion 14b in the extension direction D. The connecting surface 14c is a flat surface that connects the first portion 14a and the second portion 14b and faces the other side.

[0015] (first part) The first portion 14a is formed in a stepped shape when viewed from a direction perpendicular to the extending direction D. The first portion 14a has a small diameter hole 16, a large diameter hole 17, and a step portion 18. The small diameter hole 16 is on one side of the first portion 14a and includes the opening of the hole portion 14. The large diameter hole 17 is on the other side of the first portion 14a. The small diameter hole 16 and the large diameter hole 17 are formed in a circular shape when viewed from the extending direction D. The central axis of the small diameter hole 16 and the central axis of the large diameter hole 17 coincide with each other. The large diameter hole 17 is formed to have a smaller diameter than the small diameter hole 16.

[0016] (Stepped part) Step portion 18 is a flat surface that connects small diameter hole 16 and large diameter hole 17. Step portion 18 faces the other side.

[0017] (Second part) The second portion 14b is formed in a circular shape when viewed from the extension direction D. The second portion 14b is formed to have a larger diameter than the first portion 14a. A screw groove 19 is formed on the inner circumferential surface of the second portion 14b.

[0018] (Wear sensor) The wear sensor 3 is disposed in the hole 14 of the bearing 10 to detect wear of the bearing 10. The wear sensor 3 includes a holder 20, a shim 4, a wear tip 30, and a fixing member 40.

[0019] (holder) 1 and 2, the holder 20 is inserted into the hole 14 from the other side in the extension direction D. The holder 20 is disposed in the first portion 14a of the hole 14. The holder 20 includes a holder main body 21 and a fixing pin 22.

[0020] (Holder body) The holder body 21 includes a small diameter portion 23 and a large diameter portion 24 . The small diameter portion 23 is disposed in the small diameter hole 16 of the first portion 14a. The small diameter portion 23 is formed in a cylindrical shape extending in the extension direction D. The outer diameter of the small diameter portion 23 is slightly smaller than the inner diameter of the small diameter hole 16.

[0021] The large diameter portion 24 is provided on the bottom surface on the other side of the small diameter portion 23. The large diameter portion 24 is formed in a cylindrical shape extending in the extension direction D. The large diameter portion 24 is formed with a larger diameter than the small diameter portion 23. The large diameter portion 24 is disposed in the large diameter hole 17 of the first portion 14a. The outer diameter of the large diameter portion 24 is slightly smaller than the inner diameter of the large diameter hole 17. The large diameter portion 24 is formed integrally with the small diameter portion 23. The large diameter portion 24 has a positioning portion 25 that abuts against the step portion 18 of the first portion 14a of the hole portion 14 from the other side in the extension direction D.

[0022] (positioning part) The positioning portion 25 is a flat surface of the bottom surface on one side of the large diameter portion 24 that does not overlap with the bottom surface of the small diameter portion 23. The positioning portion 25 faces one side.

[0023] The holder body 21 described above is disposed in the hole 14 so as to be rotatable about the central axis O2 of the hole 14. The holder body 21 is made up of a pair of divided bodies 26.

[0024] (divided body) The pair of segments 26 are formed by dividing the holder main body 21 along a plane that extends along the central axis of the holder main body 21. The pair of segments 26 each have a dividing surface 26a that faces each other. One dividing surface 26a faces the other dividing surface 26a in a direction perpendicular to the extension direction D. The dividing surface 26a is a flat surface that faces the central axis O2 of the hole portion 14. Each segment 26 is formed with a fixing hole 26b that penetrates the segment 26 in a direction perpendicular to the extension direction D. The pair of fixing holes 26b are formed so that their central axes coincide. The fixing holes 26b are screw holes. A fixing pin 22 is inserted into each fixing hole 26b.

[0025] (Fixed pin) The fixing pin 22 is a bolt that is screwed into the fixing hole 26b, and fixes the pair of divided bodies 26 together with their divided surfaces 26a facing each other.

[0026] (Sim) The shim 4 is formed in an annular shape and is provided so as to be sandwiched between the step portion 18 and the positioning portion 25. The central axis of the shim 4 coincides with the central axis O2 of the hole portion 14. The shim 4 is provided to adjust the position of the holder 20 in the insertion direction.

[0027] (wear tip) The wear tip 30 is held by the holder 20. More specifically, the wear tip 30 is sandwiched and held by a pair of segments 26 at their dividing surfaces 26a. The wear tip 30 is arranged so that its thickness direction is perpendicular to the extension direction D. The wear tip 30 extends in the extension direction D. The thickness of the wear tip 30 is, for example, 0.1 mm or more and 0.3 mm or less. One end of the wear tip 30 is held by the holder 20 and placed in the hole 14. The wear tip 30 has a tip body 31 and a wiring pattern 32.

[0028] The chip body 31 is an insulating substrate made of a resin material. The tip of the chip body 31 is located at the opening of the hole 14. The chip body 31 has a first plate portion 33 and a second plate portion 34. The first plate portion 33 is on one side of the chip body 31, and the second plate portion 34 is on the other side of the chip body 31. The first plate portion 33 is formed integrally with the second plate portion 34. The width of the first plate portion 33 is smaller than the width of the second plate portion 34.

[0029] The width of the first plate portion 33 is smaller than the outer diameter of the small diameter portion 23 of the holder 20, and the first plate portion 33 is held by the small diameter portion 23 of the holder 20. The width of the second plate portion 34 is smaller than the outer diameter of the large diameter portion 24 of the holder 20, and the second plate portion 34 is held by the large diameter portion 24 of the holder 20. The second plate portion 34 has an insertion hole 34a formed therein that penetrates the tip body 31 in the plate thickness direction. The fixing pin 22 is inserted into the insertion hole 34a.

[0030] The wiring pattern 32 is formed on the main surface of the chip body 31. The wiring pattern 32 is formed from a metal material such as copper. The wiring pattern 32 has multiple pairs of wear detection wires 35. The pairs of wear detection wires 35 extend in the extension direction D. Each wear detection wire 35 is formed so as to bypass the insertion hole 34a of the chip body 31. The pair of wear detection wires 35 are electrically connected at one end. One end of the wear detection wire 35 is provided at the tip of the chip body 31. The other end of the wear detection wire 35 is connected to a resistance measuring unit (not shown), so that the electrical resistance between the pair of wear detection wires 35 can be measured.

[0031] The above-mentioned wear tip 30 is worn from one side together with the bearing 10. As wear of the wear tip 30 progresses, a break occurs between the pair of wear detection wires 35, and the electrical resistance between the pair of wear detection wires 35 changes suddenly. The wear sensor 3 detects wear of the bearing 10 by detecting this sudden change in electrical resistance.

[0032] (fixing member) The fixing member 40 is disposed in the second portion 14b of the hole 14. The fixing member 40 is made of a metal material. The fixing member 40 is formed in a cylindrical shape. The central axis of the fixing member 40 coincides with the central axis O2 of the hole 14. The wear tip 30 is inserted into the fixing member 40. A thread 42 that screws into the thread groove 19 of the second portion 14b is formed on the outer circumferential surface 41 of the fixing member 40. The fixing member 40 described above is screwed into the second portion 14b of the hole 14 toward one side, and abuts against the holder 20 from the other side.

[0033] (Action and effect) A method for installing the wear sensor 3 will be described below. First, the wear tip 30 is sandwiched between the pair of segments 26, integrating the wear tip 30 and the holder 20. Next, a shim 4 is placed in the hole 14 of the bearing 10, and the holder 20 and wear tip 30 are inserted from the other side of the hole 14. The holder 20 and wear tip 30 are inserted until the shim 4 is sandwiched between the step 18 of the hole 14 and the positioning portion 25 of the holder 20. If the tip of the wear tip 30 is not flush with the sliding surface 13 of the bearing 10, a shim 4 with a different thickness is used, and the holder 20 and wear tip 30 are inserted again. In this way, the position of the wear tip 30 in the insertion direction is adjusted. The position of the wear tip 30 in the insertion direction is adjusted until the tip of the wear tip 30 is flush with the sliding surface 13 of the bearing 10.

[0034] When the tip of the wear tip 30 is flush with the sliding surface 13 of the bearing 10, the holder 20 is rotated about the central axis O2 of the hole 14 to adjust the rotational position of the wear tip 30. Then, the fixing member 40 is screwed into the other side of the hole 14. The holder 20 is fixed by sandwiching the holder 20 and shim 4 between the step 18 of the hole 14 and the fixing member 40. This fixes and positions the wear tip 30 in the insertion direction and rotational position. Thereafter, the pair of wear detection wires 35 are connected to a resistance measuring unit (not shown), and installation of the wear sensor 3 is completed.

[0035] In this embodiment, the holder 20 is disposed in a first portion 14a on one side of the hole 14 of the bearing 10. The fixing member 40 is screwed into a second portion 14b on the other side of the hole 14 of the bearing 10 toward one side and abuts against the holder 20 from the other side. Because the holder 20 and the fixing member 40 are separate bodies, the holder 20 does not rotate in conjunction with the rotation of the fixing member 40. The holder 20 holds the wear tip 30. This allows the rotational position of the wear tip 30 to be adjusted individually, independently of the position of the wear tip 30 in the insertion direction. This prevents a decrease in the installation accuracy of the wear tip 30.

[0036] In this embodiment, first portion 14a has a stepped portion 18 facing the other side, and holder 20 has a positioning portion 25 that abuts against first portion 14a from the other side. This allows holder 20 to be positioned in the insertion direction by abutting stepped portion 18 against positioning portion 25. Therefore, with a simple configuration, the position of wear tip 30 in the insertion direction can be determined, and the installation accuracy of wear tip 30 can be improved.

[0037] This embodiment further includes a shim 4 that is sandwiched between the step portion 18 and the positioning portion 25. This allows the position of the holder 20 in the insertion direction to be adjusted simply by adjusting the thickness of the shim 4. Therefore, the position of the wear tip 30 in the insertion direction can be adjusted, and the installation accuracy of the wear tip 30 can be improved.

[0038] In this embodiment, the holder 20 has a pair of divided bodies 26. The pair of divided bodies 26 sandwich and hold the wear tip 30 at their dividing surfaces 26a. This allows the holder 20 to be given the function of holding the wear tip 30 by the simple process of simply dividing the holder main body 21 into two. This simplifies the manufacturing process of the holder 20, and therefore reduces the manufacturing cost of the holder 20.

[0039] In this embodiment, the dividing surface 26a is a flat surface. This allows the dividing surface 26a to be formed by a simple process of simply dividing the holder body 21 along a flat surface. This reduces the number of steps required to process the holder 20, thereby reducing the manufacturing cost of the holder 20.

[0040] In this embodiment, the thickness of the wear tip 30 is, for example, 0.1 mm or more and 0.3 mm or less. This reduces the area of ​​the tip surface of the wear tip 30 that is worn and deformed due to sliding against the rotating shaft 2. Therefore, the amount of deformation of the wear tip 30 can be reduced.

[0041] In the first embodiment, the chip body 31 is made of a resin material, but the present invention is not limited to this. The chip body 31 may be formed from a composite material of a resin material and a reinforcing material having a higher Young's modulus than the resin material. The resin material is the base material of the chip body 31. The reinforcing material is, for example, a reinforcing fiber such as glass fiber or carbon fiber. In this case, the Young's modulus of chip body 31 can be improved compared to when chip body 31 is made of only a resin material. Therefore, deformation of chip body 31 due to the load applied from rotating shaft 2 can be suppressed. Therefore, the load applied from chip body 31 to wiring pattern 32 can be reduced.

[0042] Furthermore, when the fiber length of the reinforcing fibers is long, the Young's modulus of the reinforcing material can be improved, thereby further improving the Young's modulus of the tip body 31. Furthermore, when the fiber length of the reinforcing fibers is short, damage to the rotating shaft 2 caused by the wear tip 30 during sliding can be reduced.

[0043] The chip body 31 may also be made of a metal material. In this case, the Young's modulus of chip body 31 can be improved compared to when chip body 31 is made of only a resin material. Therefore, deformation of chip body 31 due to the load applied from rotating shaft 2 can be suppressed. Therefore, the load applied from chip body 31 to wiring pattern 32 can be reduced.

[0044] Furthermore, by making the hardness of the metal material that constitutes the tip body 31 lower than the hardness of the rotating shaft 2, damage to the rotating shaft 2 by the worn tip 30 can be prevented. However, when the chip body 31 is made of a metal material, it is necessary to insulate the chip body 31 from the wiring pattern 32 .

[0045] Furthermore, the chip body 31 may be made of the same material as the fixing member 40 . In this case, when chip body 31 and fixing member 40 come into contact with each other, deformation of chip body 31 due to the load applied from fixing member 40 can be suppressed.

[0046] When the chip body 31 is formed from a composite material of a resin material and a reinforcing material having a higher Young's modulus than the resin material, when the chip body 31 is formed from a metal material, and when the chip body 31 is formed from the same material as the fixing member 40, it can also be applied to other embodiments described below.

[0047] Second Embodiment A wear sensor 3A according to a second embodiment of the present disclosure will be described below with reference to Fig. 3. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted as appropriate. In the second embodiment, the holder 20A has a rotation prevention portion 27 that determines the rotation position of the hole portion 14 about the central axis O2. In FIG. 3, some components such as the wear tip 30 and the fixing pin 22 are omitted.

[0048] (Stopping part) The anti-rotation portion 27 prevents the holder 20A from rotating around the central axis O2 of the hole 14 within the hole 14. The anti-rotation portion 27 is, for example, a D-cut surface formed on the outer peripheral surface 41 of the large diameter portion 24 of the holder main body 21. The anti-rotation portion 27 is formed by, for example, end milling. A pair of anti-rotation portions 27 are formed so as to face each other in the radial direction of the holder main body 21. Each dividing surface 26a is formed so as to be perpendicular to the anti-rotation portion 27. A flat surface 15 is formed in the large diameter hole 17 of the hole portion 14 of the bearing 10 at a position corresponding to the anti-rotation portion 27 .

[0049] (Action and effect) In this embodiment, when installing the wear sensor 3A, the holder 20A is inserted into the hole 14 so that the anti-rotation portion 27 faces the flat surface 15 of the hole 14. This allows the holder 20A to be installed only at the rotation position determined by the anti-rotation portion 27, eliminating the need to adjust the rotation position of the holder 20A. This reduces the number of steps required to install the holder 20A. Furthermore, the rotation prevention portion 27 can prevent the holder 20A from rotating within the hole 14, so that the installation accuracy of the wear tip 30 can be improved.

[0050] In the second embodiment, the anti-rotation portion 27 has a D-cut surface, but this is not limited to this. The anti-rotation portion 27 may be, for example, a positioning pin or a key that is provided separately from the holder body 21 and the fixing pin 22.

[0051] Third Embodiment A wear sensor 3B according to a third embodiment of the present disclosure will be described below with reference to Figures 4 and 5. In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted as appropriate. In the third embodiment, a groove 28 into which a wear tip 30 is embedded is formed in a holder 20B.

[0052] (groove) As shown in FIG. 4, the groove 28 is formed in one of the pair of dividing surfaces 26a (see FIG. 2 for the first embodiment). The groove 28 extends in the extension direction D and is open on both sides. The groove 28 has a U-shaped cross section that opens toward the other dividing surface 26a. The groove 28 is formed in a stepped shape when viewed from a direction perpendicular to the dividing surface 26a. The groove 28 has a first groove 28b and a second groove 28c. The first groove 28b is on one side of the groove 28, and the second groove 28c is on the other side of the groove 28. The first groove 28b and the second groove 28c are formed to communicate with each other. The width of the first groove 28b is smaller than the width of the second groove 28c. The side surface of the first groove 28b is formed to fit along the side surface of the small diameter portion 23 of the holder 20B. The side surface of the second groove portion 28c is formed to fit along the side surface of the large diameter portion 24 of the holder 20B.

[0053] The wear tip 30 is fitted into the groove 28. At this time, the first plate portion 33 of the wear tip 30 is fitted into the first groove 28b, and the second plate portion 34 of the wear tip 30 is fitted into the second groove 28c.

[0054] (Action and effect) In this embodiment, when the wear tip 30 is held in the holder 20B, the tip body 31 of the wear tip 30 is fitted into the groove 28. At this time, the position and orientation of the tip body 31 are restricted along the groove 28. Therefore, it is possible to suppress misalignment of the wear tip 30, thereby improving the installation accuracy of the wear tip 30.

[0055] Furthermore, by making the depth of the groove 28 equal to or slightly smaller than that of the tip body 31, the amount of deformation of the tip body 31 can be controlled, thereby improving the reliability of the wear tip 30.

[0056] As shown in FIG. 5, the holder 20B may have protrusions 28d that protrude inward from the side surfaces 28a of the grooves 28 when viewed in the thickness direction of the wear tip 30. One protrusion 28d is formed on each side surface of the second groove 28c. The pair of protrusions 28d face each other in the width direction of the wear tip 30. Each protrusion 28d supports the wear tip 30 from the other side. This allows the protrusions 28d to support the wear tip 30 from the other side opposite the sliding surface 13. This further reduces misalignment of the wear tip 30, further improving the installation accuracy of the wear tip 30.

[0057] In the third embodiment, the grooves 28 are formed on the dividing surface 26a, but this is not limiting. For example, if the holder body 21 is not divided, a flat surface may be formed on the outer peripheral surface 41 of the holder body 21, and the grooves 28 may be formed on that flat surface. In this case, the wear tip 30 is held in the holder 20B by fitting into the grooves 28. This reduces the number of steps required to fix the wear tip 30 to the holder 20.

[0058] <Fourth embodiment> A wear sensor 3C according to a fourth embodiment of the present disclosure will be described below with reference to Figures 6 to 8. In the fourth embodiment, components similar to those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted where appropriate. In the fourth embodiment, unevenness is formed on the dividing surface 26a of the holder 20C.

[0059] (Irregularities on the dividing surface) Fig. 6 is a cross-sectional view showing holder 20C with wear tip 30 sandwiched therein, as viewed from extension direction D. Fig. 6 is also a diagram schematically showing the state in which wear tip 30 is sandwiched therein. As shown in FIG. 6, the dividing surface 26a has a flat surface 26c and irregularities 29. The flat surface 26c is provided at the center of the dividing surface 26a in the width direction W of the wear tip 30. The dimension of the flat surface 26c in the width direction W is greater than the dimension of the wiring pattern 32 in the width direction W. The width direction W is perpendicular to the extension direction D (see FIG. 1). The irregularities 29 are formed on both outer sides of the flat surface 26c of the dividing surface 26a in the width direction W. In other words, the pair of irregularities 29 are formed so as to sandwich the flat surface 26c from both sides in the width direction W. The irregularities 29 have recesses 29a and protrusions 29b. In this embodiment, one of the pair of dividing surfaces 26a has a recess 29a formed on each of the flat surface 26c on both outer sides in the width direction W, and the other dividing surface 26a has a protrusion 29b formed on each of the flat surface 26c on both outer sides in the width direction W. The recess 29a of one dividing surface 26a faces the protrusion 29b of the other dividing surface 26a. The protrusion 29b is formed in a rectangular shape when viewed from the extension direction D. The protrusion 29b protrudes to a height approximately equal to the thickness of the wear tip 30. The recess 29a is formed in a U-shape opening toward the opposing dividing surface 26a when viewed from the extension direction D, and is formed to follow the outer shape of the opposing protrusion 29b. The dimension of the recess 29a in the width direction W is greater than the dimension of the protrusion 29b in the width direction W. The depth of the recess 29a is approximately equal to the thickness of the wear tip 30. The wear tip 30 is arranged so that the portion where the wiring pattern 32 is formed is sandwiched between the flat surfaces 26c. Therefore, the wiring pattern 32 is not pressed by the irregularities 29 of the dividing surface 26a. The portions of the wear tip 30 on both sides of the wiring pattern 32 in the width direction W are pressed by the irregularities 29.

[0060] (Action and effect) In this embodiment, when the wear tip 30 is sandwiched between the pair of divided bodies 26, the tip body 31 deforms to fit the shape of the irregularities 29. This causes the tip body 31 to catch on the irregularities, increasing the frictional force between the holder 20C and the wear tip 30. This prevents the wear tip 30 from shifting out of position, improving the installation accuracy of the wear tip 30.

[0061] The number of recesses 29a and protrusions 29b can be changed as appropriate. The unevenness 29 may be formed in a zigzag shape when viewed from the extension direction D as shown in Fig. 7, or in an arc shape when viewed from the extension direction D as shown in Fig. 8. Even when the unevenness 29 is formed in a zigzag shape or an arc shape, the portion of the wear tip 30 where the wiring pattern 32 is formed is sandwiched between the flat surfaces 26c, and the portions of the wear tip 30 on both sides of the wiring pattern 32 in the width direction W are sandwiched between the unevenness 29.

[0062] <Other embodiments> The above describes in detail the embodiments of the present disclosure with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes and the like are also included within the scope that does not deviate from the gist of the present disclosure. In the above embodiment, the rotating shaft 2 is given as an example of an opposing member, and the bearing 10 is given as an example of a wear member, but the present invention is not limited to this. For example, the wear sensors 3, 3A, 3B, and 3C may be provided in a braking device of a railway vehicle. In this case, the wheels of the railway vehicle correspond to the opposing members, and the brake shoes that press the wheels against the road surface correspond to the wear members.

[0063] In the above embodiment, the wiring pattern 32 has a plurality of pairs of wear detection wires 35, but this is not limited to this. The number of pairs of wear detection wires 35 can be changed as appropriate. The wiring pattern 32 may also have one pair of wear detection wires 35.

[0064] In the above embodiment, it is simply described that the wear tip 30 is inserted into the fixing member 40, but the fixing member 40 and the wear tip 30 may be bonded together, for example, with an adhesive. In this case, it is possible to prevent the wear tip 30 from shifting in position. Therefore, it is possible to improve the installation accuracy of the wear tip 30. In this case, the wear tip 30 can be supported by the fixing member 40, and therefore can withstand the load applied to the wear tip 30 from the rotating shaft 2. This makes it possible to further suppress deformation of the wear tip 30.

[0065] In the above embodiment, the step portion 18 is a flat surface connecting the small diameter hole 16 and the large diameter hole 17, but this is not limited to this. For example, the step portion 18 may be a flange or a protrusion that protrudes radially inward from the inner circumferential surface of the hole portion 14.

[0066] In the above embodiment, the positioning portion 25 is a flat surface of the bottom surface on one side of the large diameter portion 24 that does not overlap with the bottom surface of the small diameter portion 23, but this is not limited to this. For example, the positioning portion 25 may be a protrusion that protrudes from the bottom surface on one side of the large diameter portion 24 toward the other side.

[0067] <Additional Notes> The wear sensors 3, 3A, 3B, and 3C and the sliding device 1 described in each embodiment can be understood, for example, as follows.

[0068] (1) The wear sensor 3, 3A, 3B, 3C of the first aspect is a wear sensor 3, 3A, 3B, 3C provided in a hole 14 that extends so that one side opens onto the sliding surface 13 of a wear member, and includes a holder 20, 20A, 20B, 20C that is inserted into the hole 14 from the other side and is positioned in a first portion 14a on one side of the hole 14, a wear tip 30 that is held by the holder 20, 20A, 20B, 20C and has its tip positioned at the opening of the hole 14, and a fixing member 40 that is screwed toward one side into a second portion 14b on the other side of the hole 14 and abuts the holder 20, 20A, 20B, 20C from the other side. Examples of wear members include the bearing 10 and brake shoes used in the braking devices of railway vehicles.

[0069] This allows the rotational position of the wear tip 30 to be adjusted independently of the position of the wear tip 30 in the insertion direction.

[0070] (2) The wear sensors 3, 3A, 3B, and 3C according to the second aspect may be the wear sensors 3, 3A, 3B, and 3C of (1), in which the first portion 14a has a step portion 18 facing the other side, and the holders 20, 20A, 20B, and 20C may have a positioning portion 25 that abuts against the first portion 14a from the other side.

[0071] The holders 20, 20A, 20B, and 20C can be positioned in the insertion direction by abutting the step portions 18 and the positioning portions 25. Therefore, the position of the wear tip 30 in the insertion direction can be determined with a simple configuration.

[0072] (3) The wear sensors 3, 3A, 3B, and 3C according to the third aspect may be the wear sensors 3, 3A, 3B, and 3C of (2), and may further include a shim 4 arranged to be sandwiched between the step portion 18 and the positioning portion 25.

[0073] This makes it possible to adjust the positions of the holders 20, 20A, 20B, 20C in the insertion direction simply by adjusting the thickness of the shim 4. Therefore, it is possible to adjust the position of the wear tip 30 in the insertion direction.

[0074] (4) The wear sensor 3A according to the fourth aspect is any one of the wear sensors 3A (1) to (3), and the holder 20A may have a rotation prevention portion 27 for determining the rotational position of the hole portion 14 around the central axis O2.

[0075] This allows holder 20A to be installed only at the rotation position defined by anti-rotation portion 27, eliminating the need to adjust the rotation position of holder 20A, and therefore reducing the number of steps required to install holder 20A.

[0076] (5) The wear sensor 3, 3A, 3B, 3C according to the fifth aspect is a wear sensor 3, 3A, 3B, 3C according to any one of (1) to (4), wherein the holder 20, 20A, 20B, 20C has a pair of divided bodies 26, each of which has a divided surface 26a facing each other, and the pair of divided bodies 26 may hold the wear tip 30 by sandwiching it between the divided surfaces 26a.

[0077] This allows the holders 20, 20A, 20B, 20C to be provided with the function of holding the wear tip 30 through a simple process.

[0078] (6) A wear sensor 3C according to a sixth aspect is the wear sensor 3C of (5), and the divided surface 26a may have an unevenness 29 formed thereon.

[0079] This increases the frictional force between the holder 20C and the wear tip 30, thereby preventing the wear tip 30 from shifting out of position.

[0080] (7) The wear sensor 3B according to the seventh aspect is any one of the wear sensors 3B described in (1) to (6), and the holder 20B may have a groove 28 formed therein into which the wear tip 30 is fitted.

[0081] This restricts the position and orientation of the wear tip 30 along the groove 28 .

[0082] (8) The wear sensor 3B according to the eighth aspect is the wear sensor 3B of (7), wherein the holder 20B may have a protrusion 28d that protrudes inward from the side surface 28a of the groove portion 28 when viewed from the thickness direction of the wear tip 30 and supports the wear tip 30 from the other side.

[0083] This allows the wear tip 30 to be supported from the other side opposite to the sliding surface 13 by the protrusion 28d.

[0084] (9) The wear sensor 3, 3A, 3B, 3C according to the ninth aspect is a wear sensor 3, 3A, 3B, 3C according to any one of (1) to (8), wherein the wear tip 30 has a tip body 31 and a wiring pattern 32, and the tip body 31 may be formed from a composite material of a resin material and a reinforcing material having a higher Young's modulus than the resin material.

[0085] This allows the Young's modulus of the chip body 31 to be improved compared to when the chip body 31 is made of only a resin material.

[0086] (10) The wear sensor 3, 3A, 3B, 3C according to the tenth aspect is any of the wear sensors 3, 3A, 3B, 3C of (1) to (8), wherein the wear tip 30 has a tip body 31 and a wiring pattern 32, and the tip body 31 may be formed from a metal material.

[0087] This allows the Young's modulus of the chip body 31 to be improved compared to when the chip body 31 is made of only a resin material.

[0088] (11) The wear sensor 3, 3A, 3B, 3C according to the eleventh aspect is any of the wear sensors 3, 3A, 3B, 3C according to (1) to (8), wherein the wear tip 30 has a tip body 31 and a wiring pattern 32, and the tip body 31 may be formed from the same material as the fixing member 40.

[0089] This makes it possible to prevent chip body 31 from being deformed by the load applied from fixing member 40 when chip body 31 and fixing member 40 come into contact with each other.

[0090] (12) A sliding device 1 according to a twelfth aspect includes a wear sensor 3, 3A, 3B, 3C according to any one of (1) to (11), the wear member, and an opposing member that slides relative to the sliding surface 13 of the wear member. Examples of the opposing member include the rotating shaft 2 and the wheels of a railway vehicle. [Explanation of symbols]

[0091] REFERENCE SIGNS LIST 1...Sliding device 2...Rotating shaft (opposing member) 3, 3A, 3B, 3C...Wear sensor 4...Shim 10...Bearing (wear member) 11...Bearing body 12...Protrusion 13...Sliding surface 14...Hole 14a...First portion 14b...Second portion 14c...Connection surface 15...Flat surface 16...Small diameter hole 17...Large diameter hole 18...Step portion 19...Thread groove 20, 20A, 20B, 20C...Holder 21...Holder body 22...Fixing pin 23...Small diameter portion 24...Large diameter portion 25...Positioning portion 26...Split body 26a...Split surface 26b...Fixing hole 26c...Flat surface 27...Anti-rotation portion 28...Groove 28a...Side surface 28b...First groove 28c...Second groove 28d...Protrusion 29...Concave and concave portions 29a...Concave portions 29b...Convex portions 30...Worn tip 31...Tip body 32...Wiring pattern 33...First plate portion 34...Second plate portion 34a...Through-hole 35...Wear detection wiring 40...Fixing member 41...Outer periphery 42...Thread D...Extension direction O1...Rotation axis O2...Central axis W...Width direction

Claims

1. A wear sensor provided in a hole extending so as to open on one side on a sliding surface of a wear member, a holder inserted into the hole from the other side and disposed in a first portion on one side of the hole; a wear tip held by the holder and having a tip positioned at an opening of the hole; a fixing member that is screwed into a second portion on the other side of the hole toward one side and abuts against the holder from the other side; Equipped with The holder has a pair of divided bodies, The pair of divided bodies each have a divided surface facing each other, the pair of split bodies sandwich and hold the wear tip at the split surfaces, The wear sensor has unevenness formed on the dividing surface.

2. The first portion has a step portion facing the other side, The wear sensor according to claim 1 , wherein the holder has a positioning portion that abuts against the first portion from the other side.

3. The wear sensor according to claim 2 , further comprising a shim sandwiched between the step portion and the positioning portion.

4. The wear sensor according to claim 1 , wherein the holder has a rotation stopper that determines a rotation position around the central axis of the hole.

5. 5. The wear sensor according to claim 1, wherein the holder is formed with a groove into which the wear tip is fitted.

6. 6. The wear sensor according to claim 5, wherein the holder has a protrusion that protrudes inward from a side surface of the groove when viewed in the thickness direction of the wear tip, and supports the wear tip from the other side.

7. The wear tip is A chip body; a wiring pattern; 7. The wear sensor according to claim 1, wherein the tip body is formed from a composite material of a resin material and a reinforcing material having a higher Young's modulus than the resin material.

8. The wear tip is A chip body; a wiring pattern; The wear sensor according to claim 1 , wherein the tip body is made of a metal material.

9. The wear tip is A chip body; a wiring pattern; The wear sensor according to claim 1 , wherein the tip body is made of the same material as the fixing member.

10. The wear sensor according to any one of claims 1 to 9; the wear member; an opposing member that slides relative to the sliding surface of the wear member; A sliding device comprising:

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