JP2007218395A - Brake calliper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brake calliper capable of carrying out the removal of a foreign matter mixed between frictional sliding faces of a brake pad and a disc rotor. <P>SOLUTION: The brake calliper 10 includes the brake pad 14, a mounting 12, and a bimetallic strip 36 moving the brake pad 14 in the lateral direction of the brake pad 14. The bimetallic strip 36 is arranged between a torque receiving groove 34 and a guide protruding part 32, deformed in response to frictional heat generated during braking, and moves a pad back plate 22 in the lateral direction. Since a contact position of the disc rotor and a friction material 20 is changed according to the thermal deformation of the bimetallic strip 36, a contact state with respect to the foreign matter intruding between the friction material 20 and the disc rotor can be changed, and a state of a force acting on the foreign matter can be changed. By the change of the contact state and the change of the force, the discharge of the foreign matter is promoted. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a brake caliper, and more particularly to a brake caliper having a function of eliminating foreign matters mixed between a brake pad and a friction sliding surface of a disc rotor.

  As one of braking devices for braking a vehicle, there is a disc brake device. This disc brake device supports a disc rotor that rotates with a wheel, a brake pad that is pressed against the disc rotor and generates a braking force, and has a built-in cylinder portion that moves the brake pad toward and away from the disc rotor. Consists of calipers.

In addition to ensuring basic braking capability, the disc brake device is required to suppress abnormal noise generated when the brake is operated or not operated, so-called brake squeal and vibration. Brake squeal and vibration can occur when the brake pad is not sufficiently separated from the frictional sliding surface of the disc rotor when the brake is not operated, that is, when dragging occurs or when the brake pad is pressed or pressed. Occurs when is unstable. Such brake squeal and vibration not only cause discomfort to the user, but also cause uneven wear of the brake pads and the disc rotor, so it is desirable to eliminate them quickly. For example, the disc brake disclosed in Patent Document 1 has a structure that reduces drag. In this drag reduction type disc brake, an anti-rattle spring that prevents rattling of a brake pad is made of a shape memory alloy. The anti-rattle spring is deformed into a shape in which a larger pulling force is applied to the brake pad when the temperature is higher than the set temperature than when the anti-rattle spring is lower than the set temperature. The anti-rattle spring is deformed by frictional heat generated at the time of braking, and gives a large pulling force to the brake pad after the brake operation is completed. As a result, drag can be reduced.
Japanese Utility Model Publication No. 63-128329

  As described above, when the brake operation is finished, the brake pad is pulled back in the direction of the rotation axis of the disc rotor, and the friction sliding surface of the disc rotor and the brake pad are separated from each other. However, the separation distance is extremely small, and when foreign matter is mixed between the brake pad and the disc rotor, brake noise, vibration, and uneven wear are generated by dragging through the foreign matter. Such foreign matter may intrude from the outside, but the metal components contained in the disc rotor wear powder and the friction material of the brake pad bite into the friction material and aggregate there to form a large metal lump. It may stay between the disc rotors. The agglomerated metal lump also causes a so-called metal catch that abnormally wears the disk rotor. Metal catches can cause brake noise and vibration. The disc brake described in Patent Document 1 can pull back the brake pad with a large force at the end of the brake operation. The pull-back direction is the same as the disc rotor rotation axis in the same manner as the brake pad of the conventional disc brake. is there. For this reason, the brake pad and the friction sliding surface of the disk rotor come into contact at substantially the same position each time the brake is operated. As a result, foreign matter that has entered between the disc rotor and the brake pad cannot be easily discharged. In particular, when a foreign object bites into the friction material of the brake pad, the brake pad and the disc rotor contact each other at the same position and in the same state with the foreign object interposed therebetween, so the brake pad only moves in the axial direction of the disk rotor. Then, it was difficult to prevent metal catches and to discharge foreign substances. In addition, there is a problem that the effect of suppressing brake squeal and vibration is also reduced.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a brake caliper capable of removing foreign matters mixed between the brake pad and the frictional sliding surface of the disc rotor. .

  In order to solve the above-described problems, a brake caliper according to an aspect of the present invention is fixed to a vehicle body side with a brake pad that is pressed against a friction sliding surface of a disk rotor that rotates together with a wheel and applies a braking force to the disk rotor. And a mounting for freely supporting the brake pad at a position facing the friction sliding surface of the disk rotor, a pressing means for pressing the brake pad against the friction sliding surface of the disk rotor, and the mounting And a heat-deformable member that is disposed between the brake pad and changes its shape in accordance with a change in ambient temperature, and moves the brake pad in a short direction of the brake pad.

  According to this aspect, the heat deformation member is deformed according to the temperature state, and the brake pad is moved in the short direction, that is, in the radial direction of the disc rotor in the brake pad. As a result, the position at which the brake pad and the disk rotor come into contact changes depending on the movement state of the brake pad in the short direction. That is, the contact state between the disc rotor and the brake pad with respect to the foreign matter also changes. Therefore, every time the brake pad moves in the short direction, the state of the force acting on the foreign matter changes, and the foreign matter is easily discharged from between the brake pad and the disc rotor.

  Moreover, the said aspect WHEREIN: You may have a return biasing means which returns the said brake pad to an initial position with the return deformation | transformation of the said heat deformation member. As the return biasing means, for example, an elastic member such as a leaf spring or a coil spring can be used. According to this aspect, the movement operation of the brake pad accompanying the return of the shape of the heat deformable member can be performed smoothly. Further, by inserting the return biasing means, it is possible to prevent rattling of the brake pad when the thermal deformation member is not deformed. Moreover, the movement space of a brake pad can be ensured without rattling a brake pad. The urging force generated by the return urging means is desirably set to be weaker than the urging force generated when the heat deformable member is deformed.

  Further, in the above aspect, the brake pad includes a friction material that contacts a friction sliding surface of the disk rotor, and a pad back metal that supports the friction material from the back surface, and the pad back metal is attached to the mounting. Engaging portions that engage with the formed supporting portions are provided on both end faces in the longitudinal direction, and the thermal deformation member may be disposed between the supporting portion and the engaging portions in parallel with the longitudinal direction. it can. The brake pad is supported by the support portion, and moves in the direction of the rotation axis of the disc rotor to perform a pressing operation when the brake is operated. Further, after the brake pad and the disc rotor come into contact, the brake pad moves in the trailing direction. That is, the brake pad is formed so as to easily move while being supported by the support portion. Therefore, by applying the moving force due to the deformation of the heat deformable member to the pad back metal at the position of the support portion, the pad back metal, that is, the brake pad can be moved in the short direction with a good balance. Note that the support portion and the engagement portion may have a shape that fits into each other, for example, an uneven shape. For example, when the support portion is concave, the engagement portion can be convex. Moreover, when a support part is convex shape, an engaging part can be made into concave shape.

  Moreover, the said aspect WHEREIN: The said heat deformation member can be formed with a bimetal. The bimetal can be stored in a small space in the form of a flat plate when not deformed. Further, since the deformation amount of the bimetal changes according to the temperature, the moving position of the brake pad at the time of deformation is not fixed at a fixed position. That is, since the contact state between the brake pad and the disc rotor changes depending on the deformation temperature, foreign matter can be efficiently removed.

  In the above aspect, the thermally deformable member may be deformed by frictional heat caused by contact between the friction sliding surface of the disk rotor and the brake pad. According to this aspect, foreign matter can be discharged by effectively utilizing frictional heat generated during braking.

  According to the brake caliper of the present invention, the foreign matter mixed between the brake pad and the frictional sliding surface of the disc rotor is eliminated by moving the brake pad in the short direction of the brake pad by deformation of the heat deformation member. Can be done effectively.

  Hereinafter, an embodiment of the present invention (hereinafter referred to as an embodiment) will be described with reference to the drawings.

  The brake caliper of the present embodiment includes a brake pad pressed against the disc rotor, a mounting for supporting the brake pad, a pressing means for pressing the brake pad, and heat for moving the brake pad in the short direction of the brake pad. And a deformation member. The heat-deformable member is disposed between the mounting and the brake pad, and changes its shape according to a change in ambient temperature, and moves the brake pad in the short direction of the brake pad. That is, the contact position between the disc rotor and the brake pad when the brake is operated slides in the short direction of the brake pad in accordance with the thermal deformation of the thermal deformation member. As a result, it is possible to change the contact state with the foreign matter that has entered between the brake pad and the disc rotor, and the state of the force acting on the foreign matter can be changed. Foreign matter can be easily discharged by the change of the contact state and the change of the force.

  FIG. 1 is a side view of a floating brake caliper 10 (hereinafter referred to as caliper 10) of the present embodiment that constitutes a disc brake device, and FIG. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a cross-sectional view taken along line BB in FIG. As shown in FIG. 1, the caliper 10 according to the present embodiment is roughly divided into a mounting 12 for fixing the caliper itself to a vehicle body (not shown), a brake pad 14 that is pressed by the disc rotor and generates a braking force, and a brake pad. 14 and a cylinder portion 16 that drives 14. As shown in FIG. 2, the disk rotor 18 that rotates together with the wheels exists between the pair of brake pads 14. The side surfaces 18 a and 18 b of the disk rotor 18 constitute a friction sliding surface, and a pair of brake pads 14 are disposed opposite to each other with the disk rotor 18 interposed therebetween. The brake pad 14 supports the friction materials 20a and 20b having friction sliding surfaces that are in direct contact with the side surfaces 18a and 18b of the disk rotor 18, and the back side of the friction materials 20a and 20b, that is, the side that does not contact the disk rotor 18. It is comprised by the pad back metal 22a, 22b to do. Hereinafter, when the left and right friction materials are not distinguished, they are referred to as friction materials 20. Further, when the left and right pad back metal are not distinguished, the pad back metal 22 is described.

  The caliper 10 is attached to the vehicle body side via a mounting 12 so as to be displaceable in the directions of arrows L and R. As shown in FIG. 2, a bottomed hole 24 is formed in the cylinder portion 16 of the caliper 10, and a piston 26 is slidably fitted into the hole 24. A port 28 is provided at the bottom of the hole 24 and is connected to a master cylinder (not shown) via a hydraulic pipe. When the driver operates the brake pedal, the brake fluid from the master cylinder flows into the port 28 and drives the piston 26.

  When the brake fluid flows into the port 28, the piston 26 slides in the arrow L direction, that is, in the pressing direction of the piston 26 from the non-operating state shown in FIG. 2, and the friction material 20a is moved to the disc rotor 18 via the pad back metal 22a. Press against the side surface 18a. When the friction material 20a is pressed against the disk rotor 18, the piston 26 stops sliding. Even after the piston 26 stops sliding, if the brake fluid flows into the port 28, the hydraulic pressure in the hole 24 further increases. As a result, the stopped piston 26 conversely presses the inner surface of the hole 24 in the direction of arrow R, and presses the cylinder housing 16a constituting the cylinder portion 16 in the direction of arrow R. That is, as the hydraulic pressure increases, the cylinder housing 16a is displaced in the arrow R direction.

  A claw portion 30 is formed on the side of the cylinder housing 16a where the cylinder is not formed. As the cylinder housing 16a is displaced in the direction of arrow R, the claw portion 30 causes the friction material 20b to pass through the pad back metal 22b. Press against the side surface 18 b of the disk rotor 18. As a result, the disk rotor 18 is pressed between the pair of friction materials 20a and 20b, and the disk rotor 18 can be braked efficiently.

  As shown in FIG. 3, the pad backing metal 22 a that supports the friction material 20 a constituting the brake pad 14 is provided on both end faces in the longitudinal direction of the friction material 20 a of the pad backing metal 22 a (in the direction of arrow L in FIG. 3). It has the guide protrusion 32 which functions as an engaging part. The guide protrusion 32 is freely engaged with a torque receiving groove 34 that functions as a support portion formed on the mounting 12 side. The torque receiving groove 34 functions as a torque receiving surface for braking torque that acts on the brake pad 14 during braking, and guides the moving direction when the brake pad 14 contacts and separates along the rotation axis of the disc rotor 18. Functions as a member. For example, when the friction material 20 a is brought into contact with the rotating disk rotor 18, the friction material 20 a is dragged by the disk rotor 18 and receives a tangential force in the tangential direction with respect to the disk rotor 18. That is, the braking torque is received. This tangential force is received by the torque receiving groove 34 of the mounting 12 through the pad back metal 22a. In other words, the torque receiving groove 34 receives the tangential force of the friction material 20a by contacting the end surface portion of the pad back metal 22a on the trailing side of the friction material 20a with respect to the rotation direction of the disk rotor 18 when the pad back metal 22a is pressed. For example, in FIG. 3, when the disk rotor 18 (not shown) rotates counterclockwise, the torque receiving groove 34a receives the braking torque of the guide protrusion 32 that engages with the torque receiving groove 34a. Conversely, when the disc rotor 18 rotates clockwise, the torque receiving groove 34b receives the braking torque of the guide protrusion 32 that engages with the torque receiving groove 34b. As a result, the torque receiving groove 34 holds the pad back metal 22, that is, the brake pad 14 at a position facing the disk rotor 18 both when the vehicle is moving forward and backward. Further, a good braking force is secured by moving the brake pad 14 toward and away from the disc rotor 18. 3 shows the configuration of the brake pad 14 on the piston 26 side, the brake pad 14 on the claw portion 30 side also functions in the same manner. In the present embodiment, an example in which the guide protrusions 32 are provided on both end surfaces of the pad backing metal 22 and the concave torque receiving groove 34 is provided on the mounting 12 side is shown, but the unevenness may be reversed. That is, the same effect as described above can be obtained even if a concave portion is provided on the pad back metal 22 side and a convex portion is provided on the mounting 12 side.

  In the present embodiment, the brake pad 14 is configured to be movable in the radial direction of the disc rotor 18 in the short direction of the brake pad 14 with respect to the disc rotor 18, that is, in the arrow H direction in FIG. 3. Yes. In order to realize the movement of the brake pad 14 in the short direction, the caliper 10 of the present embodiment has, for example, a bimetal 36 as a thermally deformable member disposed between the guide protrusion 32 and the torque receiving groove 34. . FIG. 4 is an enlarged view of the periphery of the torque receiving groove 34. In the case of the present embodiment, the bimetal 36 having a flat plate posture at the normal time is disposed on the lower surface side of the guide protrusion 32 (the inner peripheral side of the pad back metal 22). Are arranged in parallel to the longitudinal direction of the pad backing metal 22. Further, a leaf spring 38 that urges the guide protrusion 32 toward the bimetal 36 is disposed between the upper surface of the guide protrusion 32 (the outer peripheral side of the pad back metal 22) and the torque receiving groove 34. The leaf spring 38 functions as a return urging means for returning the pad back metal 22 of the brake pad 14 to the initial position in accordance with the return deformation of the bimetal 36. An arbitrary urging member such as a coil spring can be used instead of the leaf spring. Further, on the side surface side of the guide protrusion 32, a side push spring 40 that urges the pad backing metal 22 against the torque receiving groove 34 on the opposite side is disposed between the side surface and the torque receiving groove 34. As described above, the brake pad 14, that is, the pad backing metal 22 moves freely in such a way that it can move in the longitudinal direction of the brake pad 14 (in the direction of arrow L in FIG. 3) while moving toward and away from the rotational axis direction of the disc rotor 18. Are incorporated in the torque receiving groove 34 of the mounting 12. By disposing the leaf spring 38 and the side pressing spring 40, the pad backing plate 22 can be moved, and the pad backing plate 22, that is, the brake pad 14 when no pressing force is applied by the cylinder portion 16 or the claw portion 30 is provided. Prevents rattling. In addition, the leaf spring 38 forms a movement space that can move when the bimetal 36 is deformed, as will be described later, without causing the pad back metal 22 to rattle. Further, when the bimetal 36 returns to its flat shape after the shape is restored, it functions to smoothly push the pad back metal 22 back to the initial position. The urging force of the leaf spring 38 is set to be smaller than the urging force that can be generated when the bimetal 36 is deformed. That is, when the bimetal 36 is deformed, the pad back metal 22 against the urging force of the leaf spring 38 is allowed to move toward the leaf spring 38 side. Further, when the shape of the bimetal 36 returns to the initial state, the pad back metal 22 is allowed to move toward the bimetal 36 side.

  As shown in FIGS. 5A and 5B, the bimetal 36 is a combination of two types of metal plates 36a and 36b having different coefficients of thermal expansion. When the temperature changes, the bimetal 36 as a whole has a coefficient of thermal expansion. It bends to the side of the metal plate 36b that is smaller than the metal plate 36a. In the case of a disc brake, when the side surface 18a of the disc rotor 18 and the friction material 20 of the brake pad 14 come into contact, frictional heat is generated between them. Although the temperature rise due to the generated frictional heat varies depending on the braking state, the number of brakings, and the like, the state of 100 ° C. or higher continues for a while after braking. The frictional heat generated between the side surface 18 a of the disk rotor 18 and the friction material 20 of the brake pad 14 is transmitted to the pad back metal 22 and the guide protrusion 32. Heat is also transmitted through the mounting 12. Therefore, in urban driving where the braking operation is frequently performed, a temperature sufficient to deform the bimetal 36 can be secured by frictional heat during braking. In the case of the present embodiment, it is assumed that the temperature of the bimetal 36 and its surroundings frequently becomes, for example, about 100 ° C. to 150 ° C. on an average when traveling in an urban area or the like, and the deformation of the bimetal 36 is started. The temperature is described as 70 ° C.

  For example, when the brake operation that generates sufficient frictional heat has not been performed, or when the disc brake has been cooled for a long time since the previous brake operation, such as during cruising, the bimetal 36 and its surroundings As shown in FIG. 6A, the bimetal 36 has an initial flat plate shape. In this state, the pad back metal 22 is urged by the leaf spring 38 in the arrow H1 direction. When the brake operation is performed, the pad backing metal 22 is pressed so as to approach the disk rotor 18 along the rotation axis direction of the disk rotor 18, and the side surface 18 a of the disk rotor 18 and the friction material 20 of the brake pad 14 are Friction heat is generated between the two. As described above, the temperature increased by frictional heat does not decrease immediately. Therefore, when the brake operation is finished and the brake pad 14 is in an idle state, when the frictional heat exceeds the deformation start temperature of the bimetal 36, for example, 70 ° C., as shown in FIG. 36 is deformed into a curved shape. That is, when the pressure by the cylinder portion 16 is released and the brake pad 14 returns to a freely movable state, the bimetal 36 moves the pad back metal 22 in the direction of the arrow H2 that is the short direction of the brake pad 14. As described above, since the urging force of the leaf spring 38 is smaller than the urging force that can be generated by the deformation of the bimetal 36, the pad back metal 22 can easily move in the direction of the arrow H2. If the temperature of the bimetal 36 exceeds the deformation start temperature until the next braking, the pad back metal 22 moves in the short direction (arrow H2 direction) of the brake pad 14 as shown in FIG. 6 (b). In this state, the disk rotor 18 is pressed.

  In FIG. 7A, the brake operation is performed before the pad back metal 22 moves in the short direction (arrow H2 direction), that is, before the bimetal 36 is deformed, and the friction material 20 and the disc rotor 18 come into contact with each other. Shows the state. FIG. 7B shows that the brake operation is performed after the pad back metal 22 has moved in the short direction (the direction of the arrow H2), that is, after the bimetal 36 has been deformed. Shows a state of contact. As described above, the foreign matter 42 may enter between the disk rotor 18 and the friction material 20. Such foreign matter 42 may enter from the outside, but may be a metal component contained in the wear powder of the disk rotor 18 or the friction material 20. In particular, in the case of the wear powder of the disk rotor 18 or the metal component contained in the friction material 20, it causes a so-called metal catch that bites into the friction material 20 and agglomerates there to form a large metal lump and abnormally wears the disk rotor 18. .

  However, as described above, in the case of the caliper 10 of the present embodiment, the bimetal 36 deformed by frictional heat generated during braking moves the pad back metal 22, that is, the brake pad 14 in the short direction H2. For example, at a certain timing when the bimetal 36 is not deformed, as shown in FIG. 7A, the foreign matter made of the metal powder contained in the wear powder of the disk rotor 18 or the friction material 20, or the foreign matter that has entered from the outside, It is assumed that the disc rotor 18 is sandwiched between the friction material 20 or bites into the friction material 20. In this state, it is difficult to discharge the foreign matter 42. When the brake operation is finished and the frictional heat exceeds the deformation start temperature of the bimetal 36, the bimetal 36 is deformed to move the pad back metal 22 in the direction of the arrow H2. When braking is performed again at another timing at which the bimetal 36 is deformed, the disc rotor 18 and the friction material 20 come into contact at different positions as shown in FIG. 7B. That is, when the contact position between the disk rotor 18 and the friction material 20 changes from the position at the time of the previous braking, the contact state between the foreign matter 42 biting into the friction material 20 and the disk rotor 18 also changes. For this reason, the state of the force acting on the foreign matter 42 is changed, so that the biting state of the foreign matter 42 is eliminated and the discharge from between the disc rotor 18 and the friction material 20 is facilitated. Further, even when foreign matter is not discharged by one movement of the pad back metal 22 in the short direction, the temperature rise due to braking and cooling due to running are repeated, so that the movement of the pad back metal 22 due to deformation of the bimetal 36 is also performed repeatedly. Is called. As a result, the foreign matter 42 is discharged immediately.

  By the way, the brake pad 14 is designed to have a center of gravity balance so that the brake pad 14 can move smoothly along the torque receiving groove 34. Therefore, by disposing the bimetal 36 between the guide protrusion 32 and the torque receiving groove 34, it becomes possible to efficiently apply the movement force due to the deformation of the bimetal 36 to the pad back metal 22, and the pad back metal 22, That is, the brake pad 14 can be moved in the short direction. Further, the bimetal 36 can be accommodated in a slight space between the torque receiving groove 34 and the guide protrusion 32 in a flat plate shape when not deformed.

  As described above, the caliper 10 according to the present embodiment can effectively discharge the foreign matter 42 by moving the brake pad 14 in the short direction using the bimetal 36 that is deformed by frictional heat generated during braking. In the present embodiment, since the foreign matter 42 can be discharged smoothly, the friction material 20 can be prevented from being dragged with respect to the disc rotor 18 during non-braking operation. As a result, the occurrence of brake squeal can be prevented. Moreover, the occurrence of uneven wear can be suppressed by discharging the foreign matter 42 and eliminating dragging of the friction material 20.

  By the way, when using a bimetal as a heat deformation member, if the generated temperature exceeds a predetermined deformation start temperature, the amount of deformation changes according to the temperature. That is, the moving position of the friction material 20 due to the deformation of the bimetal 36 is not fixed at a fixed position. For example, even when the position of the friction material 20 with respect to the disk rotor 18 moves, if the friction material 20 moves to the same position every time, the foreign matter 42 that bites into the friction material 20 and the disk rotor 18 become easy to become familiar, and the discharge efficiency decreases. Sometimes. On the other hand, in the case of the bimetal 36, the amount of deformation changes depending on the temperature, so the position where the friction material 20 moves is not constant and varies moderately. That is, the foreign matter 42 may come into contact with various positions of the disc rotor 18, the force acting on the foreign matter 42 changes, and the foreign matter 42 can be effectively eliminated. Of course, even when the friction material 20 moves to the same position every time, the contact state between the pad backing metal 22 and the disk rotor 18 changes, so that the foreign matter 42 can be discharged. Therefore, for example, even when a shape memory alloy that changes to a predetermined shape when the temperature exceeds a set value is used instead of the bimetal 36, the same effect as in the present embodiment can be obtained.

  In this embodiment, as shown in FIGS. 6A and 6B, the bimetal 36 is disposed below the guide protrusion 32, and the pad back metal 22 is moved in the direction of the arrow H2 when the bimetal 36 is deformed. Although the example has been described, the bimetal 36 may be disposed on the upper side of the guide protrusion 32. In this case, when the bimetal 36 is deformed, the pad back metal 22 moves in the direction of the arrow H1, but the contact position between the disk rotor 18 and the friction material 20 is the same as when the bimetal 36 is disposed below the guide protrusion 32. It changes relatively. Therefore, in this case as well, the same foreign matter 42 discharging effect as in the above-described example can be obtained.

  In the present embodiment, the example in which the heat deformable member such as the bimetal 36 is disposed between the guide protrusion 32 and the torque receiving groove 34 has been described. However, the brake pad 14 is short in the short direction by the deformed heat deformable member. If it can move to, the arrangement position is arbitrary. For example, the heat deformation member may be disposed between the lower center portion of the pad back metal 22 and the mounting 12. In addition, when the thermally deformable member is deformed, the same foreign matter discharging effect as that of the present embodiment can be obtained even if an urging force is applied to the friction material 20 and moved in the short direction.

  In the present embodiment, a single piston type floating caliper is shown as an example. However, the present embodiment can also be applied to other types of calipers, and can smoothly remove foreign substances by using deformation of a thermally deformable member. .

  The present invention is not limited to the above-described embodiments, and various modifications such as design changes can be added based on the knowledge of those skilled in the art. The configuration shown in each figure is for explaining an example, and any configuration that can achieve the same function can be changed as appropriate, and the same effect can be obtained.

It is an external view explaining the structure of the brake caliper which concerns on this embodiment. It is sectional drawing explaining the internal structure of a caliper in line segment AA of FIG. FIG. 3 is a cross-sectional view in which a friction sliding surface of a friction material of a caliper in line segment BB in FIG. 2 is exposed. It is explanatory drawing explaining the arrangement position of the bimetal of the brake caliper which concerns on this embodiment. It is explanatory drawing explaining the deformation | transformation state of the bimetal of the brake caliper which concerns on this embodiment. It is explanatory drawing explaining the movement state of the pad back metal by the deformation | transformation of the bimetal of the brake caliper which concerns on this embodiment. It is explanatory drawing explaining that the brake pad which moved by deformation | transformation of the bimetal of the brake caliper which concerns on this embodiment discharges | emits a foreign material.

Explanation of symbols

  10 Caliper, 12 Mounting, 14 Brake pad, 16 Cylinder, 16a Cylinder housing, 18 Disc rotor, 20 Friction material, 22 Pad back metal, 24 Hole, 26 Piston, 28 Port, 30 Claw, 32 Guide protrusion, 34 Torque Receiving groove, 36 bimetal, 38 leaf spring, 40 side push spring, 42 foreign matter.

Claims (5)

A brake pad that is pressed against the frictional sliding surface of the disk rotor that rotates together with the wheels and applies a braking force to the disk rotor;
A mounting that is fixed to the vehicle body and supports the brake pad so as to be freely movable at a position facing the friction sliding surface of the disk rotor;
Pressing means for pressing the brake pad against the frictional sliding surface of the disk rotor;
A heat-deformable member that is disposed between the mounting and the brake pad, changes its shape in accordance with a change in ambient temperature, and moves the brake pad in the short direction of the brake pad;
Brake caliper characterized by including.   The brake caliper according to claim 1, further comprising a return urging means for returning the brake pad to an initial position in accordance with a return deformation of the heat deformation member. The brake pad is composed of a friction material that comes into contact with the friction sliding surface of the disk rotor, and a pad back metal that supports the friction material from the back surface,
The pad back metal has engaging portions that engage with support portions formed on the mounting on both end surfaces in the longitudinal direction, and the thermal deformation member is parallel to the longitudinal direction, the support portions and the engaging portions. The brake caliper according to claim 1, wherein the brake caliper is disposed between the brake caliper and the brake caliper.   The brake caliper according to any one of claims 1 to 3, wherein the thermally deformable member is formed of a bimetal.   The brake caliper according to any one of claims 1 to 4, wherein the thermally deformable member is deformed by frictional heat due to contact between a friction sliding surface of the disk rotor and the brake pad.

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