JP5087497B2 - Disc brake - Google Patents

Description

  The present invention relates to a disc brake used for vehicle wheel braking or the like.

As a disc brake used for vehicle wheel braking, there is known an opposed piston type disc brake in which pads are arranged on both sides of the disc axial direction of the brake disc, and both pads are pressed by a pair of opposed pistons. ing.
As this type of disc brake, a carrier that supports the pad slidably in the disc axial direction and receives the braking torque of the pad, and a caliper having a piston that applies a pressing force to the pad are formed separately. A device in which a carrier and a caliper are coupled by a bolt has been devised (see, for example, Patent Document 1).
JP-A-6-341470

  However, in this conventional disc brake, the center of the piston in the circumferential direction of the disc is located at the center of the pad in the circumferential direction of the pad. There is concern about uneven wear in the direction. If the pad is worn unevenly in the disk circumferential direction, dragging, judder, brake squealing, etc. during braking are likely to occur.

  Therefore, the present invention is intended to provide a disc brake that can prevent uneven wear of the pad in the circumferential direction of the disc.

In order to solve the above problems, the present invention is a pressing center of the disk circumferential direction of the disk circumferential direction and the center of the piston of the pad is shifted in the circumferential direction of the disk, is fixed integrally to the caliper on the carrier The bolt fastening position can be changed.

  According to this invention, it is possible to suppress the pull-in of the pad by the brake disc by shifting the disc circumferential direction center of the pad and the pressing center of the piston disc circumferential direction in the disc circumferential direction. As a result, it is possible to prevent uneven wear of the pad in the disk circumferential direction.

Embodiments of the present invention will be described below with reference to the drawings. In each embodiment and modification described below, the same portions are denoted by the same reference numerals, and redundant descriptions are omitted.
First, the first embodiment shown in FIGS. 1 to 8 will be described.
1 to 3 show the entire block of the disc brake 1 for the left wheel. The disc brake 1 is coupled to a knuckle (not shown) for supporting an axle of a vehicle by fastening bolts at the fastening holes 2 and 2 at the lower edge. The block of the disc brake 1 is attached to the knuckle so as to cover a part of the outer peripheral edge of the brake disc 3 that rotates integrally with the wheel, and by pressing the outer peripheral edge of the brake disc 3 from both sides in the axial direction. Generate braking force. In the following, the description will be given with the vehicle mounted state, the radial direction of the brake disk 3 in this mounted state will be referred to as the disk radial direction, the axial direction of the brake disk 3 will be referred to as the disk axial direction, and the brake disk 3 The circumferential direction is referred to as the disk circumferential direction. In the figure, O represents the rotation center of the brake disc 3, and the arrow R represents the rotation direction of the brake disc 3.

  The block of the disc brake 1 is directly coupled to the knuckle by a bolt, and a caliper 7 having a carrier 5 that mainly holds the pads 4 and 4 pressed against the brake disc 3 and a piston 6 that presses the pads 4 and 4. It is constituted by. The disc brake 1 has a substantially arc-shaped disc passage recess 8 (see FIG. 3) that allows passage of the outer peripheral edge of the brake disc 3 across the carrier 5 and the caliper 7, and the outer side of the carrier 5 in the disc radial direction. The caliper 7 is arranged in the form of being polymerized.

  The disc brake 1 is an opposed piston type brake, and a pair of pads 4 and 4 held by the carrier 5 are arranged on both sides in the disc axial direction of the brake disc 3 and are held by the caliper 7. 6 are arranged on both sides of the brake disc 3 so as to press the back of each pad 4. In the case of this embodiment, two pistons 6 and 6 are arranged side by side in the disk rotation direction on one side of the brake disk 3, and the two pistons 6 and 6 arranged in parallel are arranged on the pad 4 that is horizontally long in the disk circumferential direction. The back is pressed.

4 is a side view of the caliper 7 of the disc brake 1 of the left wheel specification as viewed from the inner side (inner side in the vehicle width direction), and FIG. 6 is a view of the caliper 7 of the disc brake 1 of the right wheel specification from the inner side. FIG.
First, the caliper 7 will be described. The caliper 7 includes an inner side cylinder portion 9 and an outer side cylinder portion 10 (see FIG. 2) on the inner side and the outer side in the vehicle width direction with the brake disc 3 interposed therebetween. , 10 are formed in the disc circumferential direction (more precisely, the tangential direction of the brake disc 3) to accommodate the piston 6 in a slidable manner. The two bores 11, 11 of each cylinder portion 9, 10 are provided symmetrically with a center line C 1 passing through the center of the caliper 7 in the disk circumferential direction. The inner and outer cylinder portions 9 and 10 are connected to each other by a bridge portion 12 straddling the radially outer side of the brake disk 3 and surrounded by the bridge portion 12 and the cylinder portions 9 and 10 on both sides. The area is a disk passage recess 8 on the caliper 7 side. The bores 11 in the caliper 7 are connected to each other by a supply / discharge passage (not shown) in the caliper 7.

  In the case of this embodiment, a part of the outer side cylinder part 10 and the bridge part 12 and the remaining part including the inner side cylinder part 9 are formed as separate caliper blocks, and both caliper blocks follow the disk axial direction after molding. The plurality of bolts 14a, 14b, and 14c are connected to each other.

  Further, the caliper 7 as a whole is formed in a substantially arc shape when viewed from the disk axial direction, but at both ends in the disk circumferential direction on the lower edge of the inner cylinder portion 9, a thick, substantially oval shape is formed. Each boss portion 15 is formed, and an insertion hole 13 is formed in each boss portion 15. The elliptical shape of each boss portion 15 extends in a direction orthogonal to the center line C1, and the boss portions 13 and 13 are arranged so as to be symmetric with respect to the center line C1.

  As shown in FIGS. 4 and 6, the ellipse center (center on the long diameter side) CB of both boss portions 15 is set so that the intermediate position between the ellipse centers CB is located on the center line C1. In the left wheel specification shown in FIG. 4, the insertion hole 13 formed in each boss portion 15 is arranged offset to the left side (the side on which the brake disk 3 enters) across the ellipse center CB. In the right wheel specification shown in FIG. 6, the right wheel specification is arranged offset to the right side (the side on which the brake disc 3 enters) across the ellipse center CB. Therefore, although the two bores 11 and 11 of the cylinder portions 9 and 10 on the inner side and the outer side are provided symmetrically with respect to the center line C1 of the caliper 7, the center line C1 of the caliper 7 has two center lines C1. The brake disc 3 is offset in the retracting direction with respect to the intermediate point between the insertion holes 13 and 13. For this reason, the pressing center (center line C1) of the pistons 6 and 6 in the cylinder portions 9 and 10 in the circumferential direction of the disc is a set amount z in the retracting direction of the brake disc 3 when viewed from the insertion holes 13 and 13. Is just offset.

FIG. 8 is a side view of the cast product 7A viewed from the inner side before final machining of the caliper 7 of the left wheel specification and the caliper 7 of the right wheel specification.
In the case of this embodiment, as shown in the figure, a cast product 7A having a boss portion 15 without an insertion hole is formed in advance, and drilled on the boss portion 15 of the cast product 7A according to the left and right wheel specifications. The position of the insertion hole 13 to be changed is changed. In this case, since the same casting mold can be used with different left and right wheel specifications, productivity can be improved.

  In addition, a pair of long hole-shaped confirmation windows 30 penetrating in the disk radial direction is formed in the bridge portion 12 connecting both the cylinder portions 9 and 10, and the pad is passed through the confirmation window 30 from the outside of the caliper 7 in the disk radial direction. The degree of decrease of 4 can be confirmed.

FIG. 5 is a side view of the carrier 5 shared by the left wheel specification and the right wheel specification as viewed from the inner side.
The carrier 5 is provided with an inner wall 16 and an outer wall (not shown) on the inner side and the outer side in the vehicle width direction with the brake disc 3 interposed therebetween, and both edges of the both walls 16 in the disc circumferential direction are connected to each other. An opening that allows the outer peripheral edge of the brake disk 3 to be disposed is formed in the central portion.

  An extending portion 19 is provided at the inner end of the inner wall 16 in the disk radial direction, and the aforementioned fastening for bolting the carrier 5 to the knuckle at two positions spaced apart in the disk circumferential direction of the extending portion 19 is provided. A hole 2 is provided. Further, in the vicinity of both ends of the inner wall 16 in the disk circumferential direction, screw holes 20 are formed along the disk axial direction. Each screw hole 20 is a screw hole into which a bolt 21 (fastening means) penetrating the insertion hole 13 of the caliper 7 is screwed, and the caliper 7 is fixed to the carrier 5 by fastening the bolt 21.

  Further, a substantially rectangular pad receiving groove 23 in which the pad 4 and the back metal 22 that supports the pad 4 are arranged is formed at the outer edge of the inner wall 16 and the outer wall in the disk radial direction. Each of the pad receiving grooves 23 opens outward in the radial direction of the disk so that the substantially lower half of the pad 4 and the back metal 22 is received. A substantially rectangular guide groove 24 is continuously formed on the side edges of the inner wall 16 and the outer wall of each pad receiving groove 23 on both sides in the disk circumferential direction.

  In each guide groove 24, a substantially rectangular protrusion 25 protruding from both edges of the back metal 22 is slidably guided along the disk axial direction. The pad 4 is unevenly fitted into the guide grooves 24 on both sides via the protrusions 25 of the back metal 22, and the guide grooves 24 allow displacement in the disk axial direction and displacement in the disk circumferential direction and the disk radial direction outside. It has become so. In the case of this embodiment, the edge portions 24 a of the guide grooves 24 of the inner wall 16 and the outer wall serve as receiving portions that receive the braking torque of the pad 4.

Here, C2 in FIG. 5 is a center line passing through the center in the longitudinal direction of the pad 4 attached to the carrier 5. Career 5, the center line C2 of the pad 4 is consistent with the direction of the normal of the brake disc 3, and the carrier 5 on the intermediate position the center line C2 of the two screw holes 20, 20 for bolting It is supposed to be located.

The caliper 7 is integrated with the carrier 5 in a state where the pad 4 is set on the carrier 5 together with the back metal 22. At this time, the corresponding pistons 6 of the calipers 7 are set on the backs of the inner and outer backings 22, and in this state, both edges of the inner cinder portions 9 of the calipers 7 are the inner walls of the carrier 5. The bolts 21 that are superposed on the side surfaces 16 and penetrate the insertion holes 13 and 13 on the caliper 7 side are fastened to the corresponding screw holes 20 and 20 of the carrier 5.
3 and 7 show the disc brake 1 of the left wheel specification and the right wheel specification in which the caliper 7 is fastened to the carrier 5 in this manner. As shown in these drawings, the left wheel specification and the right wheel specification are shown. In any case, the center of pressing of the caliper 7 side pistons 6 and 6 in the disc circumferential direction (center line C1) is the disc circumferential direction of the pad 4 due to the offset arrangement of the insertion holes 13 and 13 on the caliper 7 side. Is offset by a set amount z linearly (in the tangential direction of the brake disc 3) in the retracting direction of the brake disc 3 with respect to the center (center line C2).

  By the way, when the caliper 7 is attached to the carrier 5 as described above, the caliper 7 is linearly offset in the retracting direction of the brake disk 3, but the caliper 7 of the left wheel specification and the right wheel specification is used as a common casting 7A. In this embodiment manufactured in this way, the inner peripheral surface of the caliper 7 is shown in FIGS. 3 and 7 in order to prevent the inner peripheral surface of the caliper 7 from interfering with the pad 4 and the main body of the carrier 5 in the offset direction. As shown in the figure, the shape is provided with two arcs R1, R2 shifted in the tangential direction of the brake disc 3 and a flat portion 27 connecting the tops thereof.

  In the disc brake 1 configured as described above, when brake fluid is supplied to the bores 11 of the cylinder portions 9 and 10 during braking, the pistons 6 in the bores 11 are moved forward by receiving fluid pressure, 6 advances the corresponding pad 4 through the back metal 22. As a result, the pads 4 on both sides of the brake disc 3 are similarly pressed against both sides of the disc 3, thereby applying a braking force.

On the other hand, the braking torque acting on the pad 4 at this time is received by the edge 24 a of each guide groove 24 of the carrier 5. Although this braking torque acts as a stress on the carrier 5, the carrier 5 and the caliper 7 are formed separately from each other and are connected to each other by the bolts 21 along the axial direction. 7 does not act directly. That is, in this disc brake 1, the edge 24 a of the guide groove 24 of the carrier 5 regulates the displacement of the pad 4 and the back metal 22 in the disc circumferential direction and the disc radial direction outside, and the caliper 7 side has only the piston 6 and the pad 4. Therefore, the caliper 7 is not directly subjected to the stress caused by the braking torque.
For this reason, in the disc brake 1, the cylinder portions 9 and 10 of the caliper 7 do not bend and deform due to the stress caused by the braking torque, and the piston 11 is prevented from sliding due to the deformation or inclination of the bore 11. The problem that the pressing direction of the piston 6 is inclined does not occur.

Further, in this disc brake 1, the disc circumferential direction pressing center (center line C1) of the pistons 6 and 6 on the caliper 7 side is the brake disc with respect to the disc circumferential direction center (center line C2) of the pad 4. 3 is linearly offset by a set amount z in the exit direction of 3, so that the brake disc 3 is prevented from being pulled in by the brake disc 3 at the end of the pad 4 in the disc circumferential direction (end of the brake disc 3 in the entry direction). And the uneven wear of the pad 4 resulting from the drawing can be reliably prevented. Therefore, when this disc brake 1 is employed, dragging, judder, brake squeal and the like during braking due to uneven wear of the pad 4 can be prevented.
The appropriate value of the set amount z, which is the offset amount of the caliper 7, varies depending on the thickness of the pad 4 and the friction coefficient. Specifically, when the pad 4 is thick and the friction coefficient is high, it is necessary to increase the set amount z that is an offset amount. Conversely, when the pad 4 is thin and the friction coefficient is low. It is necessary to reduce the set amount z that is an offset amount.

Furthermore, in the disc brake 1 of this embodiment, only a machining position of the insertion hole 13 formed in the boss portion 15 is used by using a common casting 7A having a substantially elliptical boss portion 15 as shown in FIG. Since the caliper 7 for the left wheel specification and the right wheel specification is created separately by changing, many parts can be shared by the left wheel specification and the right wheel specification including the carrier 5. Therefore, it is possible to reduce manufacturing costs and component management costs .

FIG. 9 shows a modification of the first embodiment.
In this modification, the insertion hole 113 formed in the boss portion 15 of the caliper 7 is formed in a long hole shape extending in the same direction as the extending direction of the boss portion 15. In the case of this modification, since the insertion hole 113 has a long hole shape, the offset amount of the caliper 7 with respect to the carrier is optimized by appropriately shifting the fastening position of the bolt according to the thickness of the pad 4 actually used and the friction coefficient. Can be set to a value.

FIG. 10 shows another modification of the first embodiment.
In this modification, an insertion hole 13 </ b> A for the left wheel specification and an insertion hole 13 </ b> B for the right wheel specification are provided in parallel in the substantially elliptical boss portion 15 of the caliper 7. In the case of this modification, when the caliper 7 is used as the right wheel specification, a bolt is inserted into the one insertion hole 13A, and when used as the left wheel specification, the bolt is inserted into the other insertion hole 13B. In the case of this modification, since the caliper 7 can be completely shared by the left wheel specification and the right wheel specification, the parts management cost can be further reduced.

  FIGS. 11 and 12 are modifications in which similar improvements are made to the boss portion 15 of the caliper 7 shown in FIGS. 4 and 10. The boss portion 215 of each modified example of FIGS. 11 and 12 is provided with a recess 35 on the outer peripheral surface so as to follow the shape of the insertion hole 13 and the insertion holes 13A and 13B. In these modified examples, since the hollow portion 35 is provided on the outer peripheral surface of the boss portion 215, the weight can be reduced without causing a decrease in rigidity of the boss portion 215.

Next, a second embodiment shown in FIGS. 13 to 18 will be described.
In the disc brake 301 of this embodiment, the structure of the carrier 5 that supports the pad 4 is the same as that of the first embodiment, but the structure of the caliper 307 that holds the piston 6 is slightly different.

13 and 14 are side views of the disc brake 301 with the left wheel specification as viewed from the inner side, and FIG. 15 is a side view of the caliper 307 with the same specification as viewed from the inner side. FIG. 16 is a side view of the caliper 307 of the right wheel specification viewed from the inner side, and FIG. 17 is a side view of the disc brake 301 of the same specification viewed from the inner side.
In the caliper 307, as in the first embodiment, the inner cylinder portion 9 and the outer cylinder portion 10 (not shown in FIGS. 13 to 18; see FIG. 2) are connected by the bridge portion 12, and each cylinder is connected. Two bores 11, 11 are provided in parallel in the portions 9, 10, and a piston 6 that presses the back of the pad 4 is slidably fitted in each bore 11. In the figure, C1 indicates a center line that matches the center of pressing of the piston 6 in the disk circumferential direction, and C2 indicates a center line that matches the center of the pad 4 in the disk circumferential direction.

  Thick, substantially oval bosses 315 are formed at both ends of the lower edge of the inner cylinder portion 9 in the disk circumferential direction, and insertion holes 13 are formed in the boss portions 315, respectively. The elliptical shape of each boss portion 315 extends along a circumferential tangent centered on the rotation center O of the brake disk 3, and the boss portions 315 and 315 are arranged so as to be symmetrical with respect to the center line C1. ing.

  As shown in FIGS. 15 and 16, the elliptical center (center on the long diameter side) CB of both boss portions 315 is such that the bisector of the angle formed by both elliptical centers CB is positioned on the center line C1. Is set. In the left wheel specification shown in FIG. 15, the insertion hole 13 formed in each boss portion 315 is arranged offset to the left side in the drawing (the entry side of the brake disc 3) in the disc circumferential direction across the ellipse center CB. In the right wheel specification shown in FIG. 16, the right wheel specification is arranged offset to the right side (the entrance side of the brake disc 3) in the disc circumferential direction with the ellipse center CB interposed therebetween. Therefore, the center (C1) of the disc circumferential direction of the pistons 6 and 6 in the cylinder portions 9 and 10 can be seen with reference to the insertion holes 13 and 13 in both the left wheel specification and the right wheel specification. For example, the set angle θ is offset in the retracting direction of the brake disk 3. Therefore, in the state in which the caliper 307 is coupled to the carrier 5 by the bolt 21, the center of pressing of the piston 6, 6 (center line C <b> 1) of the piston 6, 6 in each cylinder portion 9, 10 is The set angle θ is offset in the retracting direction of the brake disk 3 with respect to the center (center line C2).

  Also in the case of this embodiment, the left wheel is obtained by using a casting 307A having a substantially elliptical boss portion 315 as shown in FIG. 18 and changing only the processing position of the insertion hole 13 formed in the boss portion 315. The caliper 307 of the specification and the right wheel specification is made separately.

  As described above, in this disc brake 301, the center of the disc circumferential direction of the pistons 6 and 6 on the caliper 307 side (center line C1) is the center of the pad 4 in the disc circumferential direction (center line C2). Since the brake disk 3 is offset by the set angle θ in the retracting direction, the end of the pad 4 in the circumferential direction of the pad 4 (the end of the approaching direction of the brake disk 3) is pulled by the brake disk 3 during braking. Can be reliably suppressed. Therefore, in this disc brake 301, it is possible to prevent uneven wear of the pad 4 due to the pull-in of the brake disc 301.

  Further, in this disc brake 301, since the caliper 307 is displaced by a set angle θ around the rotation center O and bolted to the carrier 5, the caliper 7 is different from the first embodiment in which the caliper 7 is linearly displaced in the tangential direction. The end portion of 307 does not protrude radially outward. Accordingly, the disc brake 301 can be disposed in the predetermined housing portion 29 (see FIGS. 14 and 17) of the vehicle body without reducing the thickness of the bridge portion 12 of the caliper 307, so that the caliper 307 has sufficient rigidity. Can be kept high.

  In the case of this disc brake 301, the caliper 307 is displaced by a set angle θ in the rotational direction and is bolted to the carrier 5. Therefore, the braking moment generated when each piston 6 presses the pad 4 during braking is the first. Unlike the case of this embodiment, all work on the same circumference at all times. For this reason, there is an advantage that the behavior of the pad 4 is always stable, and the occurrence of brake squeal due to a slight pressure can be prevented. In addition, the shift | offset | difference of the braking moment for each piston 6 in the case of 1st Embodiment is shown with the broken line in FIG. 3, FIG.

19 to 21 show a modification of the second embodiment.
In the modification shown in FIG. 19, the insertion hole 113 formed in the boss 315 is formed in a long hole shape. In this modification, the bolt fastening position is appropriately shifted in the insertion hole 113. The offset angle of the caliper 307 can be arbitrarily adjusted.
In the modified example shown in FIG. 20, each boss portion 315 is provided with a left wheel specification insertion hole 13A and a right wheel specification insertion hole 13B in parallel so that a common caliper 307 can be used in each specification. It is.
In the modification shown in FIG. 21, the boss portion 415 formed on the caliper 307 is provided with a hollow portion 35 along the shape of the insertion hole to be processed at the stage of the cast product 307A.

Next, a third embodiment shown in FIGS. 22 to 24 will be described.
The basic structure of the disc brake 501 of this embodiment is almost the same as that of the second embodiment, but the structure of the attachment portion for attaching the caliper 507 to the carrier 505 in the rotational direction is slightly different. . That is, in the second embodiment, the position of the insertion hole 13 on the caliper 307 side is offset by a set angle θ toward the approach side of the brake disc 3 with respect to the center of pressing of the piston 6 in the disc circumferential direction (center line C1). However, in the disc brake 501 of the third embodiment, the position of the insertion hole 13 on the caliper 507 side is not offset, and the position of the screw hole 20 of the carrier 505 is set in the disc circumferential direction of the pad 4. The set angle θ is offset from the center (center line C2) toward the retracting side of the brake disk 3.

Specifically, thick, substantially elliptical bosses 40 are formed on both edges of the carrier 505 in the disk circumferential direction, and screw holes 20 are formed in the bosses 40. The elliptical shape of each boss portion 40 extends along a circumferential tangent centered on the rotation center O of the brake disc 3, and both boss portions 40 are center lines C <b> 2 (the center of the pad 4 in the disc circumferential direction). ) Are arranged symmetrically. The elliptical center (center on the long diameter side) CB of both boss portions 40 is set so that the bisector of the angle formed by both elliptical centers CB is positioned on the central line C2. The screw hole 20 is arranged offset to the retracting side of the brake disk 3 with the ellipse center CB of the boss portion 40 sandwiched between the left wheel specification and the right wheel specification.
Therefore, in the state where the caliper 507 is fastened to the carrier 505 by the bolt 21, the pressing center (center line C 1) of the pistons 6 and 6 on the caliper 507 in the disc circumferential direction is the disc circumference of the pad 4 on the carrier 505. The set angle θ is offset in the retracting direction of the brake disk 3 with respect to the center of the direction (center line C2).

  Further, in this embodiment, the left wheel specification and the left wheel specification are obtained by using a casting 505A having a substantially elliptical boss portion 40 as shown in FIG. 24 and changing only the machining position of the screw hole 20 formed in the boss portion 40. The right wheel specification carrier 505 is made separately.

  In the case of this disc brake 501, as in the second embodiment, the pressing center (center line C1) of the pistons 6 and 6 in the disk circumferential direction is the center (center line C2) of the pads 4 in the disk circumferential direction. On the other hand, since the set angle θ is offset in the retracting direction of the brake disk 3, uneven wear of the pad 4 due to the brake disk 3 being pulled in can be prevented. In addition, the same effects as those of the second embodiment can be obtained in other respects.

25 and 26 show a modified example of the third embodiment.
In the modification shown in FIG. 25, a long hole-like insertion hole 620 is formed in the boss portion 40, and a bolt is inserted into the insertion hole 620 and the caliper and the carrier 505 are fixed by fastening with a bolt and a nut. It is. In the case of this modification, the offset angle of the caliper can be arbitrarily adjusted by appropriately shifting the fastening position of the bolt within the insertion hole 620.
In the modified example of FIG. 26, each boss portion 40 is provided with a screw hole 20A for the left wheel specification and a screw hole 20B for the right wheel specification in parallel so that a common carrier 505 can be used for each specification. is there.
Also in the case of the boss portion 40 of this embodiment, a recessed portion may be provided on the outer surface of the boss portion 40 along the shape of the screw hole formed in the boss portion 40.

The first in the embodiment, by offsetting the position of the insertion hole 13 of the caliper 7, disk circumferential direction of the pressing center of the piston 6 (center line C1) the pad 4 shown in FIGS. 1-8 Although the position of the screw hole 20 of the carrier 5 may be linearly offset, the position of the screw hole 20 of the carrier 5 may be linearly offset.

  In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary. For example, the brake disk of each of the above embodiments is provided with two pistons in each of the inner and outer cylinder parts of the caliper, but the number of pistons provided in each cylinder part is three. There may be more than one. In this case, the center of pressing of the piston in the disk circumferential direction is the center of the piston if it is one piston, and the center position between the piston centers arranged on the end side if it is three or more pistons. .

The side view which looked at the disc brake of 1st Embodiment of this invention from the vehicle width direction inner side. The top view which looked at the disc brake of the embodiment from the outer peripheral side. The side view which looked at the disc brake of the embodiment from the inner side in the vehicle width direction with a part of the inner side of the caliper removed. The side view which looked at the caliper of the embodiment from the vehicle width direction inner side. The side view which looked at the carrier of the embodiment from the vehicle width direction inner side. The side view which looked at the caliper of the embodiment from the vehicle width direction inner side. The side view which looked at the disc brake of the embodiment from the inner side in the vehicle width direction with a part of the inner side of the caliper removed. The side view which looked at the cast product of the caliper of the embodiment from the vehicle width direction inner side. The side view which looked at the caliper of the modification of the embodiment from the vehicle width direction inner side. The side view which looked at the caliper of the other modification of the embodiment from the vehicle width direction inner side. The side view which looked at the caliper of the other modification of the embodiment from the vehicle width direction inner side. The side view which looked at the caliper of the other modification of the embodiment from the vehicle width direction inner side. The side view which looked at the disc brake of 2nd Embodiment of this invention from the vehicle width direction inner side. The side view which looked at the disc brake of the embodiment from the inner side in the vehicle width direction with a part of the inner side of the caliper removed. The side view which looked at the caliper of the embodiment from the vehicle width direction inner side. The side view which looked at the caliper of the embodiment from the vehicle width direction inner side. The side view which looked at the disc brake of the embodiment from the inner side in the vehicle width direction with a part of the inner side of the caliper removed. The side view which looked at the cast product of the caliper of the embodiment from the vehicle width direction inner side. The side view which looked at the caliper of the modification of the embodiment from the vehicle width direction inner side. The side view which looked at the caliper of the other modification of the embodiment from the vehicle width direction inner side. The side view which looked at the cast product of the caliper of the other modification of the embodiment from the vehicle width direction inner side. The side view which looked at the disc brake of 3rd Embodiment of this invention from the vehicle width direction inner side. The side view which looked at the disc brake of the embodiment from the inner side in the vehicle width direction with a part of the inner side of the caliper removed. The side view which looked at the cast of the carrier of the embodiment from the vehicle width direction inner side. The side view which looked at the carrier of the modification of the embodiment from the vehicle width direction inner side. The side view which looked at the carrier of the other modification of the embodiment from the vehicle width direction inner side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,301,505 ... Disc brake 3 ... Brake disc 4 ... Pad 5,505 ... Carrier 6 ... Piston 7,307,507 ... Caliper 21 ... Bolt C1 ... Centerline (Pushing center of piston circumferential direction of piston)
C2 ... Center line (center of the pad disk circumferential direction)

Claims (3)

A carrier for supporting at least a pair of pads arranged on both sides of the brake disc so as to be movable in the disc axial direction and receiving a braking torque of the pads;
Is formed separately from the said carrier is secured by bolts to the carrier, a caliper having a piston provided in the opposite order to press at least a pair of pads respectively,
In the disc brake device having
A pressing center of the disk circumferential direction of the disk circumferential direction and the center of the front Symbol piston of the pad is shifted in the circumferential direction of the disk, the fastening position of the bolt for fixing together the caliper to the carrier changes Disc brake characterized by being possible. The hole for inserting and fastening the bolt formed to fasten the bolt is formed in a substantially elliptical boss formed in the caliper or the carrier. Disc brake. The caliper is fixed to the carrier such that the center of the disk in the disk circumferential direction and the center of pressure of the piston in the disk circumferential direction are offset by a predetermined angle in the disk withdrawal direction with the center of rotation of the disk as the center. The disc brake according to claim 1, wherein the disc brake is a disc brake.

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