Sensor fixture and abnormality detection device

Abstract

To provide a configuration example of a sensor fixture for attaching a temperature sensor to a brake shoe forming a drum brake of a vehicle, which can inhibit looseness occurring between splittable two members when the sensor fixture is formed by the two members.SOLUTION: A sensor fixture 100 according to the disclosure attaches a temperature sensor 4 to a brake shoe 3 of a drum brake 2 of a vehicle and includes: a holding part 200 which holds the temperature sensor on an inner peripheral surface of a rim part 11 provided at the brake shoe; a pressing part 300 which presses the holding part holding the temperature sensor on the inner peripheral surface of the rim part; and an integration part 101, 600 which integrates the holding part with the pressing part.SELECTED DRAWING: Figure 9

Description

Technical Field

[0001] The present disclosure relates to a technique for detecting abnormalities in drum brakes.

Background Art

[0002] For example, a drum brake used in a vehicle such as a truck, a bus, or a trailer includes a brake shoe to which a brake lining is attached, and a temperature sensor is attached to this brake shoe. The abnormality detection device mounted on the vehicle can use this temperature sensor to detect whether an abnormal state such as high temperature has occurred in, for example, a drum brake mechanism or a bearing mechanism.

[0003] The brake shoes of drum brakes have different thicknesses depending on, for example, the vehicle type. Therefore, it is desirable to configure the sensor fixture for attaching the temperature sensor so that the temperature sensor can be attached even when the thickness of the brake shoe is different.

[0004] For example, the sensor fixture disclosed in Patent Document 1 is composed of two separable members, a mounting portion and a fixing portion. According to this configuration, by combining members with different shapes according to the thickness of the brake shoe, the temperature sensor can be attached even when the thickness of the brake shoe is different.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] When the sensor fixture is composed of two separable members, if looseness occurs between these two members, there is a risk that the temperature sensor will fall off.

[0007] The present disclosure provides a configuration example of a sensor fixture for attaching a temperature sensor to a brake shoe that constitutes a drum brake of a vehicle, which can suppress the occurrence of looseness between the two members even when the sensor fixture is composed of two separable members.

Means for Solving the Problem

[0008] The sensor fixture 100 according to the present disclosure is a sensor fixture for attaching a temperature sensor 4 to a brake shoe 3 of a drum brake 2 of a vehicle, and includes a holding portion 200 that holds the temperature sensor on the inner peripheral surface of a rim portion 11 provided on the brake shoe, a pressing portion 300 that presses the holding portion that holds the temperature sensor on the inner peripheral surface of the rim portion, and joining portions 101, 600 that join the holding portion and the pressing portion.

[0009] The abnormality detection device 1 according to the present disclosure includes the sensor fixture 100 according to the present disclosure as a sensor fixture for attaching a temperature sensor 4 to a brake shoe 3 of a drum brake 2 of a vehicle.

[0010] According to the present disclosure, by joining the holding portion 200 and the pressing portion 300 by the joining portions 101, 600, it is possible to suppress the occurrence of looseness between the two members 200, 300.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Mode for Carrying Out the Invention

[0012] Hereinafter, an example of an embodiment according to the present disclosure will be described with reference to the drawings.

[0013] [Overall Summary] The abnormality detection device 1 illustrated in FIG. 1 is provided on the brake shoe 3 of a cylindrical drum brake 2 mounted on a vehicle such as a truck, a bus, a trailer, or the like. Note that the directions of the arrows X1 and X2 illustrated in each figure are directions along the axial direction of the drum brake 2, the directions of the arrows Y1 and Y2 are directions along the tangential direction of the drum brake 2, and the directions of the arrows Z1 and Z2 are directions along the radial direction of the drum brake 2.

[0014] The axial direction of the drum brake 2, that is, the directions of the arrows X1 and X2, is the direction in which the axle that rotates the vehicle wheels extends. The direction of the arrow X1 is the mounting direction of the pressing member 300 described later. The direction of the arrow X2 is the removal direction of the pressing member 300 described later. The direction of the arrow Z1 is the direction toward the inner side in the radial direction of the drum brake 2. The direction of the arrow Z2 is the direction toward the outer side in the radial direction of the drum brake 2.

[0015] The abnormality detection device 1 includes a temperature sensor 4 and a sensor fixture 100. The sensor fixture 100 detachably mounts the temperature sensor 4 on the brake shoe 3. The abnormality detection device 1 is used to detect whether an abnormality such as wear or overheating of the brake lining 6 has occurred by detecting the temperature of the brake shoe 3 with the temperature sensor 4.

[0016] [Drum Brake] The drum brake 2 illustrated in FIG. 2 is an attachment target to which the abnormality detection device 1 is attached. The drum brake 2 includes a brake shoe 3, a brake drum 5, a brake lining 6, an S cam 7, a return spring 8, and the like. The drum brake 2 has a configuration in which a brake shoe 3 and the like are provided in a brake drum 5 that rotates together with the vehicle wheels.

[0017] The brake shoe 3 includes a rim portion 11 and a reinforcing portion 12. The rim portion 11 is, for example, referred to as a "shoe rim" or the like. The rim portion 11 has a predetermined width and thickness and is a strip-shaped long plate member that curves in an arc shape along the circumferential direction of the circular drum brake 2.

[0018] The reinforcing portion 12 is, for example, referred to as a "shoe web" or the like. The reinforcing portion 12 is provided on the concave side of the rim portion 11, that is, on the inner circumferential surface side opposite to the brake lining 6. The reinforcing portion 12 curves in an arc shape along the inner circumferential surface of the rim portion 11. Further, the reinforcing portion 12 protrudes perpendicularly to the inner circumferential surface of the rim portion 11.

[0019] The brake shoe 3 having the rim portion 11 and the reinforcing portion 12 as described above is configured such that its cross-sectional shape, that is, the cross-sectional shape seen along the tangential direction of the drum brake 2, is a so-called "T shape".

[0020] A plurality of, in this case, two brake shoes 3 are provided for one drum brake 2. The pair of brake shoes 3 are arranged such that the convex side, that is, the outer circumferential surface side of the rim portion 11, faces the inner circumferential surface of the cylindrical brake drum 5 with a certain gap. Also, one end of each of the pair of brake shoes 3 is rotatably supported by an anchor pin 13. Hereinafter, in the brake shoe 3, the end opposite to the end supported by the anchor pin 13 is referred to as the open end.

[0021] The brake lining 6 is attached to the brake shoe 3. Specifically, the brake lining 6 is attached to the outer circumferential surface side which is the convex side of the rim portion 11. The brake lining 6 generates a braking force as it is pressed against the inner circumferential surface of the brake drum 5 by the brake shoe 3. A plurality of, in this case, two brake linings 6 are attached to one brake shoe 3.

[0022] The two brake linings 6 attached to one brake shoe 3 are arranged with a gap of several millimeters in the circumferential direction so that a gap 14 where the brake shoe 3 is exposed is formed between them. As will be described later, the sensor fixture 100 is attached to the brake shoe 3 by utilizing the gap 14 between the pair of brake linings 6.

[0023] The S-cam 7 is an S-shaped member rotatably attached and can contact the open ends of the pair of brake shoes 3 respectively. When the vehicle's brake pedal is depressed, the actuator 20 rotates the S-cam 7 in a direction to expand the space between the open ends of the pair of brake shoes 3, that is, in a direction to press the brake lining 6 against the inner circumferential surface of the brake drum 5. Thereby, a frictional force is generated between the brake lining 6 and the inner circumferential surface of the rotating brake drum 5, and the vehicle is braked by this frictional force.

[0024] Note that as the space between the open ends of the pair of brake shoes 3 expands, the return spring 8 is stretched. Thereby, a restoring force is generated in the return spring 8 to return to its original state.

[0025] The return spring 8 is connected between the open ends of the pair of brake shoes 3. When the depression of the vehicle's brake pedal is released, the actuator 20 rotates the S-cam 7 in a direction to narrow the space between the open ends of the pair of brake shoes 3. As a result, due to the restoring force of the return spring 8, the space between the open ends of the pair of brake shoes 3 is narrowed, and the brake lining 6 is held at a position separated from the inner circumferential surface of the brake drum 5. Thereby, the braked state of the vehicle is released.

[0026] [Abnormality Detection Device] The abnormality detection device 1 is configured such that the temperature sensor 4 is attached to the brake shoe 3 by the sensor attachment fixture 100, and the temperature of the brake shoe 3 can be detected by this temperature sensor 4. As illustrated in FIG. 1, the temperature sensor 4 is a linear member that is bent at a plurality of locations, for example, two locations, and includes a detection unit 4a and a sensor extension unit 4b. The detection unit 4a is provided at the tip of the temperature sensor 4. The outer shape of the detection unit 4a is a columnar shape that extends linearly. The sensor extension unit 4b extends from the inner side of the detection unit 4a by bending. A cylindrical connection unit 4c is provided at the end of the sensor extension unit 4b, in this case, the end on the side opposite to the detection unit 4a. The connection unit 4c is connected to a control unit (not shown) mounted on the vehicle via a lead wire 4d.

[0027] Among the temperature sensor 4, particularly the detection unit 4a and the sensor extension unit 4b are covered by a cylindrical member made of metal, and the outer shape of its cross section is circular. The detection unit 4a has a temperature-sensitive part (not shown) inside. The temperature-sensitive part changes its electrical characteristics according to temperature. Therefore, the temperature sensor 4 can detect temperature based on the state of the electrical characteristics of the temperature-sensitive part in the detection unit 4a.

[0028] [Sensor fixing tool] As shown in FIG. 1, the sensor attachment fixture 100 includes a holding member 200 and a pressing member 300. The holding member 200 is an example of a holding part and is a member that holds the temperature sensor 4 on the inner peripheral surface of the rim part 11. The pressing member 300 is an example of a pressing part and is a member that presses the holding member 200 that holds the temperature sensor 4 on the inner peripheral surface of the rim part 11.

[0029] The holding member 200 and the pressing member 300 are independent separate members that can be separated from each other. The holding member 200 and the pressing member 300 are each made of a metal plate such as a stainless steel plate, for example. The holding member 200 and the pressing member 300 are each formed by subjecting the metal plate to various processes such as pressing, bending, and drilling.

[0030] [Holding part] As shown in FIGS. 3 and 4, the holding member 200 integrally includes a base portion 201, a first holding portion 202, a second holding portion 203, a first leg portion 204, a second leg portion 205, and a receiving portion 206. In addition, FIG. 5 illustrates the front, top, side, bottom, and back views of the holding member 200 for easy understanding of the configuration example of the holding member 200. In the present disclosure, for convenience of explanation, the side in the direction of arrow X2 is defined as the front.

[0031] The base portion 201 has a flat plate shape extending in the directions of arrows X1 and X2, and is a portion that serves as the main axis of the holding member 200.

[0032] The first holding portion 202 extends toward the arrow Y2 side at the end of the base portion 201 on the arrow X1 side, that is, the end on the mounting direction side of the pressing member 300 described later. The first holding portion 202 extends along the arrow Y2 direction. The first holding portion 202 has a semi-cylindrical curved portion 202a that curves so as to protrude toward the arrow Z1 side, that is, the radially inner side of the drum brake 2. The holding member 200 holds the detection portion 4a of the temperature sensor 4 in a state where the detection portion 4a is fitted into the curved portion 202a.

[0033] The second holding portion 203 extends toward the arrow Y1 side, that is, the side opposite to the first holding portion 202, at the end of the base portion 201 on the arrow X1 side, that is, the end on the mounting direction side of the pressing member 300 described later. The second holding portion 203 extends in a direction inclined with respect to the arrow Y1 direction and the arrow Z1 direction.

[0034] A pair of holding slits 203a are formed at the tip of the second holding portion 203. The pair of holding slits 203a face each other with a predetermined interval along the arrow Y1 and Y2 directions. The holding slit 203a on the arrow Y1 side is open toward the arrow Z2 side. The holding slit 203a on the arrow Y2 side is open toward the arrow Z1 side. That is, the pair of holding slits 203a are open in opposite directions.

[0035] The second holding part 203 holds the sensor extension part 4b and the connection part 4c of the temperature sensor 4 by a pair of holding slits 203a. Specifically, the second holding part 203 holds the temperature sensor 4 in a state where the connection part 4c is sandwiched between the pair of holding slits 203a.

[0036] The first leg part 204 extends toward the arrow Y1 side and the arrow Y2 side at the end of the base part 201 on the arrow X2 side, that is, the end on the removal direction side of the pressing member 300 described later. The first leg part 204 has a rectangular protruding part 204a protruding toward the arrow Z1 side in the middle thereof. In this case, one protruding part 204a is formed on the first leg part 204 extending toward the arrow Y1 side, and a plurality, in this case, two protruding parts 204a are formed on the first leg part 204 extending toward the arrow Y2 side. The first leg part 204 abuts against the inner peripheral surface of the rim part 11 and supports the end of the holding member 200, particularly on the arrow X2 side.

[0037] The second leg part 205 extends toward the arrow Y1 side and the arrow Y2 side at the end of the base part 201 on the arrow X2 side, that is, the end on the removal direction side of the pressing member 300 described later. The second leg part 205 is located on the arrow X1 side of the first leg part 204. The tip of the second leg part 205 extends toward the arrow Z2 side. The middle part of the second leg part 205 extending toward the arrow Y1 side protrudes in a rectangular shape toward the arrow Z1 side. The middle part of the second leg part 205 extending toward the arrow Y2 side protrudes in an inclined shape toward the arrow Z1 side.

[0038] The tip of the second leg part 205 is inserted into a through hole provided on the inner peripheral surface of the rim part 11. Thereby, the second leg part 205 positions the holding member 200 on the inner peripheral surface of the rim part 11, and thus the entire sensor fixture 100. Note that a plurality of through holes are provided on the inner peripheral surface of the rim part 11 for fixing, for example, the brake lining 6. The tip of the second leg part 205 is inserted into a through hole provided at the mounting position of the sensor fixture 100 among these plurality of through holes. Also, a rivet is disposed in the through hole. More specifically, the tip of the second leg part 205 is inserted into a recess formed in the head of this rivet.

[0039] The receiving part 206 is located between the first holding part 202 and the second holding part 203 at the end of the base part 201 on the arrow X1 side, that is, the end on the mounting direction side of the pressing member 300 described later. The receiving part 206 has a pair of regulating walls 206a. The pair of regulating walls 206a extends in the arrow Z1 direction. The pair of regulating walls 206a face each other with a predetermined interval along the arrow Y1, Y2 directions.

[0040] An engaging hole part 207 is formed in the receiving part 206. The engaging hole part 207 is an example of a concave part. In this case, it is formed in the part of the receiving part 206 on the arrow X2 side with respect to the regulating wall 206a. The engaging hole part 207 is a rectangular hole part that penetrates the receiving part 206 along the arrow Z1, Z2 directions. Note that the concave part may not be a hole part that penetrates the receiving part 206, but may be, for example, a recessed part or a groove part that depresses toward the arrow Z2 side.

[0041] [Pressing part] As shown in FIGS. 6 and 7, the pressing member 300 integrally includes an elastic bending part 301, a first extension part 302, a second extension part 303, an inner peripheral side locking part 304, an outer peripheral side locking part 305, a connecting part 306, and a positioning part 307. Note that FIG. 8 illustrates the front, plan, side, bottom, and back surfaces of the pressing member 300 in order to facilitate understanding of the configuration example of the pressing member 300. In the present disclosure, for convenience of explanation, the arrow X2 side is regarded as the front.

[0042] The elastic bending part 301 connects the first extension part 302 and the second extension part 303. The elastic bending part 301 is a part where a plate material is bent into a substantially U shape. The plate material of the part constituting the elastic bending part 301 is bent so as to rotate around an axis parallel to the arrow Y1, Y2 directions, and is bent so that the arrow X2 side is open. When an external force that narrows the space between the first extension part 302 and the second extension part 303 is applied to this elastic bending part 301, an elastic force that repels the external force, that is, an elastic force that expands the space between the first extension part 302 and the second extension part 303 is generated.

[0043] The first extension part 302 is a part that extends linearly from one end of the elastic bending part 301 toward the arrow X2 side, that is, the removal direction side of the pressing member 300. The first extension part 302 extends parallel to the arrow X1 and X2 directions. The second extension part 303 is a part that extends linearly from the other end of the elastic bending part 301 toward the arrow X2 side, that is, the removal direction side of the pressing member 300. The second extension part 303 is inclined so as to descend from the arrow X1 side toward the arrow X2 side, that is, so as to face the arrow Z2 side.

[0044] The inner circumferential side locking part 304 is a part that extends from the tip of the second extension part 303 toward the arrow X2 side, that is, the removal direction side of the pressing member 300. The inner circumferential side locking part 304 is formed such that the width in the arrow Y1 and Y2 directions increases as it goes from the arrow X1 side toward the arrow X2 side.

[0045] The outer circumferential side locking part 305 extends from the lower end of the connecting part 306, that is, the end on the arrow Z2 side, toward the arrow X1 side, that is, the attachment direction side of the pressing member 300. The outer circumferential side locking part 305 is a belt-shaped part that is inserted into the gap 14 between the pair of brake linings 6 when fixing the sensor fixture 100 to the rim part 11. The outer circumferential side locking part 305 is formed to be perpendicular to the plane parallel to the arrow X1, X2 directions and the arrow Y1, Y2 directions, and is arranged perpendicular to the outer peripheral surface of the rim part 11 within the gap 14.

[0046] The connecting part 306 is a plate-shaped part that connects between the inner circumferential side locking part 304 and the outer circumferential side locking part 305. The positioning part 307 protrudes in the arrow Z2 direction from the front end of the arm part 304a that extends from the inner circumferential side locking part 304 toward the arrow Y1 side. The positioning part 307 abuts against the side surface of the rim part 11, that is, the surface on the arrow X2 side, when pushing the pressing member 300 into the rim part 11. Thereby, the positioning part 307 restricts the pressing member 300 from being pushed further toward the arrow X1 side. Also, due to the restriction by the positioning part 307, the pressing member 300 is positioned.

[0047] An engaging protrusion 308 is formed on the first extension part 302. The engaging protrusion 308 is an example of a convex part, and in this case, it is formed at the tip of the first extension part 302, that is, the end on the arrow X2 side. The engaging protrusion 308 is a protrusion that protrudes from the arrow Z2 side to the arrow Z2 side at the tip of the first extension part 302. Further, the engaging protrusion 308 is an elongated protrusion along the arrow X1, X2 directions. Note that the convex part may not be an elongated protrusion, but may be a protrusion such as a circular shape or a rectangular shape.

[0048] [Mounting Method of Temperature Sensor] Next, an example of a mounting method for attaching the temperature sensor 4 to the brake shoe 3 by the sensor mounting tool 100 will be described.

[0049] First, the operator arranges the holding member 200 on the inner peripheral surface side of the rim part 11. Specifically, the operator arranges the holding member 200 on the inner peripheral surface side of the rim part 11 while holding the temperature sensor 4 by the holding member 200, that is, while holding the sensor extension part 4b and the connection part 4c by the second holding part 203.

[0050] When arranging the holding member 200 on the inner peripheral surface side of the rim part 11, the operator arranges the detection part 4a of the temperature sensor 4 within the curved part 202a of the holding member 200 and sandwiches the detection part 4a between the curved part 202a and the inner peripheral surface of the rim part 11. Further, the operator inserts the second leg part 205 of the holding member 200 into a through hole provided on the inner peripheral surface of the rim part 11. Thereby, the positioning of the holding member 200 on the inner peripheral surface of the rim part 11 is performed.

[0051] Next, the operator attaches the pressing member 300 to the rim part 11 while pressing the holding member 200 against the inner peripheral surface of the rim part 11. Specifically, the operator turns the elastic curved part 301 and the tip side of the outer peripheral side locking part 305 of the pressing member 300 toward the rim part 11 side. At this time, the operator arranges the pressing member 300 so that the outer peripheral side locking part 305 is positioned to face the gap 14 between the pair of brake linings 6.

[0052] Next, the operator pushes the pressing member 300 in the direction of arrow X1, which is the mounting direction, so as to sandwich the holding member 200 and the rim portion 11 between the inner peripheral side locking portion 304 and the outer peripheral side locking portion 305. At this time, the operator pushes the pressing member 300 against the elastic force of the elastic bending portion 301. In this way, the operator mounts the pressing member 300 on the rim portion 11.

[0053] As illustrated in FIG. 9, as the pressing member 300 moves forward in the direction of arrow X1, which is the mounting direction, the engaging protrusion 308 slides on the receiving portion 206. At this time, the elastic bending portion 301 is elastically deformed so as to narrow the space between the first extension portion 302 and the second extension portion 303. Therefore, a restoring force that tries to return to the original state, that is, an elastic force that expands the space between the first extension portion 302 and the second extension portion 303, is generated in the elastic bending portion 301.

[0054] Then, when the pressing member 300 further moves forward in the direction of arrow X1 and the engaging protrusion 308 reaches onto the engaging hole portion 207, the elastic bending portion 301 tries to return to the original state due to the restoring force. Along with this, the engaging protrusion 308 fits well into the engaging hole portion 207, and the engaging protrusion 308 or its peripheral portion abuts well against the engaging hole portion 207 or its peripheral portion. And when such fitting and abutting are performed well, a clicking sound such as "pachin", "pachitt", etc. is generated.

[0055] That is, according to the sensor fixture 100, when the engaging protrusion 308 of the pressing member 300 engages with the engaging hole portion 207 of the holding member 200, that is, when the holding member 200 and the pressing member 300 are properly combined, a predetermined sound is generated. Also, according to the sensor fixture 100, the engaging hole portion 207 and the engaging protrusion 308 function as an example of a combining portion 101 that properly combines the holding member 200 and the pressing member 300.

[0056] In addition, according to the sensor fixture 100, in a state where the holding member 200 and the pressing member 300 are properly joined together, a part of the pressing member 300, in this case, the first extension portion 302, fits between a part of the holding member 200, in this case, between a pair of regulating walls 206a. Thereby, the positioning of the pressing member 300, particularly the positioning in the directions of the arrows Y1 and Y2, can be performed.

[0057] According to the sensor fixture 100, in a state where the holding member 200 and the pressing member 300 are properly joined together, the pressing member 300 presses the receiving portion 206 of the holding member 200 toward the arrow Z2 side, that is, the inner peripheral surface side of the rim portion 11, by the elastic force of the elastic bending portion 301. Therefore, the first holding portion 202, which is integral with the receiving portion 206, is also pressed toward the arrow Z2 side, that is, the inner peripheral surface side of the rim portion 11. Thereby, a state can be formed in which the detection portion 4a of the temperature sensor 4 held in the bending portion 202a of the first holding portion 202 is strongly pressed toward the arrow Z2 side, that is, the inner peripheral surface side of the rim portion 11, and it is possible to suppress the detection portion 4a from falling off.

[0058] [Effect] According to the present disclosure, the following effects can be obtained. That is, according to the sensor fixture 100, it includes a joining portion 101 that properly joins the holding member 200 and the pressing member 300. According to this configuration example, by joining the holding member 200 and the pressing member 300 by the joining portion 101, it is possible to suppress loosening from occurring between the two members 200 and 300. Therefore, regarding the sensor fixture 100 for attaching the temperature sensor 4 to the brake shoe 3 that constitutes the drum brake 2 of the vehicle, even when the sensor fixture 100 is constituted by two members 200 and 300 that can be mutually divided, it is possible to suppress loosening from occurring between the two members 200 and 300 and prevent the temperature sensor 4 from falling off.

[0059] According to the sensor fixture 100, the joining part 101 is configured to engage an engagement hole part 207 provided in the holding member 200 and an engagement protrusion part 308 provided in the pressing member 300. According to this configuration example, the holding member 200 and the pressing member 300 can be firmly joined by the engagement between the engagement hole part 207 and the engagement protrusion part 308, and it is possible to further suppress the occurrence of looseness between the two members 200 and 300.

[0060] According to the sensor fixture 100, a predetermined sound is configured to be generated as the engagement hole part 207 and the engagement protrusion part 308 engage with each other. According to this configuration example, the operator can recognize that the engagement hole part 207 and the engagement protrusion part 308 are properly engaged, and thus the holding member 200 and the pressing member 300 are properly joined, based on the fact that the predetermined sound is heard, and the workability can be improved.

[0061] In particular, in a situation where the mounting position of the sensor fixture 100 cannot be visually observed, the operator has to manually join the holding member 200 and the pressing member 300, and it is difficult to visually confirm by sight that the holding member 200 and the pressing member 300 are properly joined, and it is also difficult to tactilely confirm by fingers. According to the sensor fixture 100, when it is difficult to confirm the joining of the two members 200 and 300 both visually and tactilely in this way, it is possible to confirm whether the two members 200 and 300 are properly joined auditorily based on the presence or absence of sound. Therefore, the workability can be significantly improved.

[0062] The present disclosure is not limited to the above-described embodiment, and modifications, expansions, etc. can be appropriately made without departing from the gist thereof.

[0063] The concave portion only needs to be provided on one of the holding member 200 and the pressing member 300, while the convex portion only needs to be provided on the other of the holding member 200 and the pressing member 300. Therefore, the engaging hole portion may be provided on the pressing member 300 instead of the holding member 200, and the engaging protrusion portion may be provided on the holding member 200 instead of the pressing member 300.

[0064] The sensor fixture 100 can be implemented with its configuration appropriately changed according to the mounting position of the temperature sensor 4 on the brake shoe 3 and the like.

[0065] For example, FIG. 10 illustrates a case where the temperature sensor 4 is attached to a portion of the brake shoe 3 where the reinforcing rib 3a is provided. The reinforcing rib 3a is generally in the shape of a triangular wall and is formed perpendicular to the rim portion 11 and the reinforcing portion 12. Further, the reinforcing rib 3a is formed integrally with the rim portion 11 and the reinforcing portion 12. In this case, the sensor fixture 100 includes a holding member 400 instead of the holding member 200 described above. The holding member 400 is an example of a holding portion and is a member that holds the temperature sensor 4 on the inner peripheral surface of the rim portion 11.

[0066] Hereinafter, the characteristic portions of the holding member 400 that are different from the holding member 200 will be described. That is, as illustrated in FIGS. 11 and 12, the holding member 400 includes cutout portions 410 extending in the directions of arrows X1 and X2. The holding member 400 is disposed on the inner peripheral surface of the rim portion 11 in a state where the reinforcing rib 3a is accommodated in the cutout portions 410. According to the sensor fixture 100 including such a holding member 400, the temperature sensor 4 can be attached to a portion of the brake shoe 3 where the reinforcing rib 3a is provided. In the configuration example illustrated in FIG. 10, the pressing member 300 is used, but a pressing member having a configuration different from that of the pressing member 300 may be used.

[0067] FIG. 13 illustrates a sensor fixture 100 including a holding member 500 instead of the holding member 200 described above. The holding member 500 is an example of a holding portion and is a member that holds the temperature sensor 4 on the inner peripheral surface of the rim portion 11.

[0068] As illustrated in FIGS. 14 and 15, the holding member 500 differs from the holding member 200 described above in terms of the length of the base portion 501, the position, shape, and length of the first leg portion 504, and the position, shape, and length of the second leg portion 505. Thus, the sensor fixture 100 can use holding members with different configurations according to, for example, the mounting position of the temperature sensor 4 and the thickness of the rim portion 11 at the mounting position of the temperature sensor 4. In the configuration example illustrated in FIG. 13, the pressing member 300 is used, but a pressing member with a configuration different from that of the pressing member 300 may also be used.

[0069] The sensor fixture 100 illustrated in FIG. 16 includes a fastening member 600. The fastening member 600 is an example of a joining portion and is constituted by, for example, a combination of a bolt 601 and a nut 602. The fastening member 600 fastens and joins a plate-shaped fastened portion 603 provided integrally with the holding member and a plate-shaped fastened portion 604 provided integrally with the pressing member by means of the bolt 601 and the nut 602. Also by such a fastening member 600, the holding member and the pressing member can be appropriately joined without looseness. Note that the configuration of the joining portion by fastening can be any configuration that can fasten two separate members without looseness, such as a combination of a screw and a screw hole or a combination of a claw and a claw hole, and various configurations can be applied.

[0070] In the embodiments according to the present disclosure, the functions realized by one component may be realized by a plurality of components, or the functions realized by a plurality of components may be realized by one component. The various components exemplified in the embodiments according to the present disclosure may be appropriately combined. A part of the components exemplified in the embodiments according to the present disclosure may be omitted.

[0071] Note that although the present disclosure has been described based on the embodiments, it is understood that the present disclosure is not limited to these embodiments or structures. The present disclosure also includes various modifications and variations within the equivalent scope. In addition, various combinations and forms, as well as other combinations and forms including only one element, more than one element, or less than one element thereof, fall within the scope and spirit of the present disclosure.

[0072] In addition, the control unit and its method described in the present disclosure may be implemented by a dedicated computer configured by a processor and a memory programmed to execute one or more functions embodied by a computer program. Alternatively, the control unit and its method described in the present disclosure may be implemented by a dedicated computer configured by a processor constituted by one or more dedicated hardware logic circuits. Or, the control unit and its method described in the present disclosure may be implemented by one or more dedicated computers constituted by a combination of a processor programmed to execute one or more functions and a memory and a processor constituted by one or more hardware logic circuits. Also, the computer program may be stored in a computer-readable non-transitory tangible storage medium as instructions executable by a computer.

Description of Reference Numerals

[0073] In the drawings, 1 represents an abnormality detection device, 2 represents a drum brake, 3 represents a brake shoe, 4 represents a temperature sensor, 11 represents a rim portion, 100 represents a sensor fixture, 101 represents a combined portion, 200 represents a holding member (holding portion), 207 represents an engagement hole portion (concave portion, combined portion), 300 represents a pressing member (pressing portion), 308 represents an engagement protrusion portion (convex portion, combined portion), and 600 represents a fastening member (combined portion).

Claims

1. A sensor fixture (100) for attaching a temperature sensor (4) to a brake shoe (3) of a drum brake (2) of a vehicle, comprising: a holding portion (200) for holding the temperature sensor on the inner peripheral surface of a rim portion (11) provided on the brake shoe; a pressing portion (300) for pressing the holding portion that holds the temperature sensor on the inner peripheral surface of the rim portion; a combining portion (101, 600) for combining the holding portion and the pressing portion; and the sensor fixture comprising the above.

2. The sensor fixture according to Claim 1, wherein the combining portion is configured to engage a concave portion (207) provided on one of the holding portion and the pressing portion with a convex portion (308) provided on the other of the holding portion and the pressing portion.

3. The sensor fixture according to Claim 2, wherein a sound is generated as the concave portion and the convex portion engage with each other.

4. The sensor fixture according to Claim 1, wherein the combining portion (600) is configured to fasten the holding portion and the pressing portion.

5. An abnormality detection device (1) comprising a sensor fixture (100) for attaching a temperature sensor (4) to a brake shoe (3) of a drum brake (2) of a vehicle, wherein the sensor fixture comprises: a holding portion (200) for holding the temperature sensor on the inner peripheral surface of a rim portion (11) provided on the brake shoe; a pressing portion (300) for pressing the holding portion that holds the temperature sensor on the inner peripheral surface of the rim portion; a combining portion (101, 600) for combining the holding portion and the pressing portion; and the abnormality detection device comprising the above.

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