JP2010156417A - Disk brake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably suppress brake noise regardless of the magnitude of braking force while upsizing of a device is inhibited. <P>SOLUTION: A disk brake device 100 is equipped with an annular disk rotor 10 fixed to an axle, a pad member 20 which makes contact with the disk rotor 10 in the axle direction, and a caliper 30 which movably supports the pad member 20 in the axle direction and suppresses circumferential and radial movements of the disk rotor 10, wherein the caliper 30 is equipped with a fixing section 31 for fixing the caliper 30 to car body side and a cylinder mechanism 32 pressing the pad member 20 to the disk rotor 10 from the axle direction, the pad member 20 is equipped with a projection section 23 projected in radial inner direction, and the caliper 30 is equipped with a groove section 35 housing the projection section 23 and restricting the movement of the projection section 23 toward a trailing side or a leading side and a radial restricting section restricting the movement of the pad member 20 toward the radial outer direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

As a disc brake device for braking a vehicle or the like, for example, Patent Document 1 discloses a structure in which a pad member is held by a pair of push anchor portions and pull anchor portions on a trailing side and a leading side. Patent Document 2 discloses a so-called push-pull disc brake structure in which a pad member is inserted into a U-shaped recess formed in a support plate and fixed to the vehicle body side.
Japanese Patent Laid-Open No. 3-106361 Japanese Patent No. 2006-520450

  Here, since the pad member is pressed against the rotating disk rotor, a frictional force is generated in the circumferential direction of the disk rotor. Due to this frictional force, the pad member moves in the rotational direction of the disk rotor and is pressed against the anchor portion of the caliper, and a rotational moment is generated around the anchor portion. The region where the rotational moment is the same as the rotational direction of the disk rotor is a region where the contact load is stable, and the region where the rotational moment is opposite to the rotational direction of the disk rotor is a region where the contact load is unstable (hereinafter, It is also referred to as “couple loss area”. When the contact load is unstable, not only a desired brake braking force cannot be obtained, but also brake noise (generally called “brake squeal”) occurs. In particular, it is known that brake noise is likely to occur when the hydraulic pressure of the cylinder for pressing the pad member against the disk rotor is low. For this reason, it is desirable to make this couple loss area as small as possible.

  However, in the technique disclosed in Patent Document 1, the pad member is not stabilized only by the pull anchor portion, and this load must be received by the push anchor portion. In the technique disclosed in Patent Document 2, since the pad member is supported by the U-shaped recess, it is difficult to stably suppress the brake noise unless the dimensional accuracy is high because there are many support portions. . In addition, in order to reduce the couple missing area, a slit may be provided in this area, but since the brake braking force is reduced by the amount provided, the pad member having a large size must be used, Increases the size of the device.

  Accordingly, an object of the present invention is to stably suppress brake noise regardless of the magnitude of the brake braking force while suppressing an increase in the size of the device.

  In order to solve the above problems, in the present invention, an annular disk rotor fixed to an axle, a pad member that comes into contact with the disk rotor from the axle direction, and the pad member are supported so as to be movable in the axle direction. A caliper that restricts movement of the pad member in the circumferential direction and the radial direction of the disk rotor, the caliper fixing the caliper to the vehicle body side, and the pad member A disc brake device comprising: a cylinder mechanism that presses against the disc rotor from an axle direction, wherein the pad member includes a projecting portion projecting radially inward, and the caliper accommodates the projecting portion Then, the groove portion that restricts the movement of the protruding portion toward the trailing side or the leading side and the movement of the pad member outward in the radial direction are restricted. Disc brake apparatus comprising the direction regulating portion is provided.

  According to the present invention, the protruding portion protruding inward in the radial direction is accommodated in the groove portion, and the groove portion restricts movement of the protruding portion toward the trailing side or the leading side, so that the caliper is in the radial direction. The pad member can be received inward. For this reason, the bending deformation of the caliper in the circumferential direction can be suppressed, and the unstable region where the rotational moment is reversed can be reduced. As a result, the center of the surface pressure can be prevented from entering the unstable region without increasing the size and rigidity of the device, so that brake noise can be effectively suppressed.

  Further, in the present invention, the caliper is formed on the trailing side of the caliper on the trailing side of the caliper outside the groove portion in the radial direction and restricts movement of the pad member to the circumferential trailing side. A side regulating portion, and a trailing side inclined portion that is formed at a trailing side end portion of the groove portion and is inclined in a circumferential direction of the disk rotor. When the pressing force of the cylinder mechanism exceeds a predetermined load, the pad member is moved to a position where the trailing side end of the pad member abuts on the trailing side regulating portion when the pressing force of the cylinder mechanism exceeds a predetermined load. The structure formed so that a displacement may be guided may be sufficient. According to this configuration, since the trailing side end portion of the groove portion is inclined in the circumferential direction, a large couple is ensured when the pressing force of the cylinder mechanism is relatively small when the vehicle moves forward. On the other hand, when the pressing force of the cylinder mechanism is relatively large, the trailing side regulating portion can also regulate the displacement of the pad member in the circumferential direction and receive a large braking force.

  Further, in the present invention, the caliper is formed on the leading side of the caliper at the outer side in the radial direction than the groove portion, and restricts the movement of the pad member to the circumferential leading side. And a leading side inclined portion formed at the leading end of the groove portion and inclined in the circumferential direction of the disk rotor, wherein the leading side inclined portion is configured so that the disk rotor rotates to the leading side. In addition, when the pressing force of the cylinder mechanism exceeds a predetermined load, the displacement of the pad member is guided to a position where the leading end of the pad member contacts the leading side regulating portion It may be configured. According to this configuration, since the leading side end portion of the groove portion is inclined in the circumferential direction, a large couple can be ensured when the pressing force of the cylinder mechanism is relatively small when the vehicle is moving backward. On the other hand, when the pressing force of the cylinder mechanism is relatively large, the displacement of the pad member in the circumferential direction can also be regulated by the leading side regulating portion.

  In the present invention, the trailing side regulating portion and the leading side regulating portion may be formed at substantially the center in the radial direction of the caliper. According to this configuration, the pad member can be stably supported.

  Moreover, in this invention, the structure provided in the both sides in the said circumferential direction of the said groove part may be sufficient as the said fixing | fixed part. According to this configuration, since the circumferential load input from the pad member to the groove portion is transmitted to the fixed portion as tension and compression force, the pad member is supported without reinforcing the caliper. Stiffness can be improved.

  Moreover, in this invention, the structure formed in the said circumferential direction center and the said radial inside of the said pad member may be sufficient as the said groove part. According to this configuration, it is possible to separate the unstable region from which the couple is removed from the surface pressure center.

  In the present invention, the cylinder mechanism may be provided on one side of the disc rotor in the axle direction. According to this configuration, it is only necessary to provide the cylinder mechanism on one side, so that the cost can be reduced.

  According to the present invention, it is possible to stably suppress brake noise regardless of the magnitude of the brake braking force while suppressing an increase in the size of the device.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiment described below is an example as means for realizing the present invention, and the present invention can be applied to a modified or modified embodiment described below without departing from the spirit of the present invention.

  FIG. 1 is a plan view of a disc brake device 100 according to an embodiment of the present invention. The disc brake device 100 according to the present invention is a device that is provided for each wheel of a four-wheel automobile or the like and brakes the vehicle.

  The disc brake device 100 includes an annular disc rotor 10 fixed to an axle, a pad member 20 that contacts the disc rotor 10 from the axle direction, a pad member 20 that supports the pad member 20 so as to be movable in the axle direction, and a disc of the pad member 20. A caliper 30 for restricting movement of the rotor 10 in the circumferential direction and the radial direction.

  The pad member 20 has an inner pad 21 that contacts the disc rotor 10 from the inner side in the vehicle width direction and an outer pad 22 that contacts the disc rotor 10 from the outer side in the vehicle width direction. Each of the inner pad 21 and the outer pad 22 is configured by adhering friction members 21b and 22b to the surfaces of the back plates 21a and 22a.

  The caliper 30 is formed in a substantially U-shaped cross section so as to sandwich the disk rotor 10. The caliper 30 includes a fixing portion 31 for fixing the caliper 30 to the vehicle body side, and a cylinder mechanism 32 that presses the pad member 20 against the disc rotor 10 from the axle direction.

  The fixing portions 31 are bolt holes formed on both sides in the circumferential direction of a groove portion 35 to be described later, and the bolts B1 are inserted into the bolt holes and fixed to the vehicle body side. Thereby, since the load input from the pad member 20 to the groove portion 35 is transmitted to the fixing portion 31 as tension and compression force, the support rigidity of the pad member 20 can be improved without reinforcing the caliper 30. .

  The cylinder mechanism 32 is provided on one side in the axial direction of the disk rotor 10. In this embodiment, the cylinder mechanism 32 is provided on the inner pad 21 side. Accordingly, the cylinder mechanism 32 may be provided on both the inner pad 21 side and the outer pad 22 side, but the cost can be reduced as compared with the case where the cylinder mechanism 32 is provided independently, and the disc brake device 100 can be provided. It can be downsized.

  More specifically, brake oil is sent to the cylinder mechanism 32 from a brake master cylinder (not shown) according to the driver's brake operation, and when the pressure in the cylinder increases, the piston pushes the inner pad 21 toward the disk rotor 10 side. . Then, the inner pad 21 pressed by the piston is pressed against the disk rotor 10, and the caliper 30 moves in the direction of the inner pad 21 by the reaction force of the piston pressing the inner pad 21 against the disk rotor 10. The outer pad 22 is pressed against the disc rotor 10 by the movement of the caliper 30. Thereby, a desired brake braking force can be obtained.

  FIG. 2 is a view showing the pad member 20 and the caliper 30 as seen from the outer pad 22 side. The pad member 20 is formed on the circumferentially center of the disk rotor 10 and a protruding portion 23 protruding radially inward, and on the trailing side (forward rotation side) of the pad member 20, and protrudes in the radial direction of the disk rotor 10. The trailing side protrusion 24 and the leading side protrusion 25 that is formed on the leading side (reverse side) of the pad member 20 and protrudes in the radial direction of the disk rotor 10 are further provided. The trailing side protruding portion 24 is formed at a position corresponding to a trailing side regulating portion 33 described later, and the leading side protruding portion 25 is formed at a position corresponding to a leading side regulating portion 34 described later.

  The caliper 30 is formed on the trailing side of the caliper 30 so as to extend radially outward from the vicinity of the trailing side fixing portion 31, and regulates movement of the pad member 20 in the circumferential trailing direction and radially outward direction. A ring-side restricting portion 33 and a leading that is formed on the leading side of the caliper 30 so as to extend radially outward from the vicinity of the leading-side fixing portion 31 and restricts movement of the pad member 20 in the circumferential leading direction and the radially outward direction. The side restricting portion 34 and the protruding portion 23 are accommodated, a groove portion 35 that restricts the movement of the protruding portion 23 toward the trailing side or the leading side, and the trailing end of the groove portion 35 are formed on the disc rotor 10. Are formed at the trailing-side inclined portion 36 inclined in the circumferential direction and the leading end of the groove portion 35. Further comprising a leading side inclined portion 37 which is inclined in the circumferential direction.

  The trailing side restricting portion 33 is formed on the inner side of the caliper 30 at a substantially central position in the radial direction (vertical direction) of the disc rotor 10 of the caliper 30. The leading side regulating portion 34 is formed at a position facing the trailing side regulating portion 33. That is, the leading-side restricting portion 34 is formed on the inner side of the caliper 30 at the approximate center in the radial direction (vertical direction) of the disc rotor 10 of the caliper 30. The groove portion 35 is formed in the inner bottom portion of the caliper 30 at the center in the circumferential direction and inward in the radial direction of the disk rotor 10.

  When the pressing force of the cylinder mechanism 32 exceeds a predetermined load, the trailing-side inclined portion 36 moves the pad member 20 to a position where the trailing-side end of the pad member 20 contacts the trailing-side regulating portion 33. It is formed to guide the displacement. More specifically, in the trailing side inclined portion 36, the circumferential load input from the disk rotor 10 to the pad member 20 is greater than or equal to a predetermined load that can prevent vibration in the audible region of the pad member 20. Further, the pad member 20 is formed so as to guide the displacement of the pad member 20 to a position where the trailing side end portion of the pad member 20 contacts the trailing side regulating portion 33. A similar inclined portion 26 is formed at a position corresponding to the trailing-side inclined portion 36 of the pad member 20.

  The leading side inclined portion 37 guides the displacement of the pad member 20 to a position where the leading side end portion of the pad member 20 contacts the leading side regulating portion 34 when the pressing force of the cylinder mechanism 32 exceeds a predetermined load. To be formed. More specifically, the leading-side inclined portion 37 is used when the circumferential load input from the disk rotor 10 to the pad member 20 is equal to or greater than a predetermined load that can prevent vibration in the audible region of the pad member 20. The pad member 20 is formed so as to guide the displacement of the pad member 20 to a position where the leading end of the pad member 20 contacts the leading side regulating portion 34. A similar inclined portion 27 is formed at a position corresponding to the leading-side inclined portion 36 of the pad member 20.

  Next, the operation procedure of the disc brake device 100 will be described using the above configuration. FIG. 3 is a view showing the relationship between the pad member 20 and the caliper 30 when the cylinder mechanism 32 is at a low hydraulic pressure. FIG. 4 is a view showing the relationship between the pad member 20 and the caliper 30 when the cylinder mechanism 32 is at a high hydraulic pressure. Here, an example in which the disc brake device 100 performs braking when the vehicle moves forward will be described, but the same applies to the case where braking is performed when the vehicle moves backward.

  If the pad member 20 is pressed against the disc rotor 10 that is rotating toward the trailing side when the brake hydraulic pressure is low, the pad member 20 and the disc rotor 10 are not pressed because the pressing force of the pad member 20 is small. It moves to the trailing side by the frictional force F1. At this time, it is known that a brake squeal is liable to occur because the center of the surface pressure is easily shifted and the contact force is unstable, and the couple is likely to enter the region where the contact force is unstable.

  Therefore, it is necessary to make the couple loss area as small as possible. Therefore, in the present embodiment, the protrusion 23 is formed in the pad member 20 and the groove 35 is formed in the caliper 30 to restrict the movement of the pad member 20 on the circumferential trailing side.

  The frictional force F1 can be expressed as F1 = μN1, where the friction coefficient μ is the pressing force N1 of the pad member 20. The rotational moment P1 around the contact X1 can be expressed by P1 = F1L1 / H1, where F1 is a frictional force, L1 is a circumferential distance to the contact point, and H1 is a radial distance to the contact point.

  Further, as the brake hydraulic pressure increases, the frictional force between the disc rotor 10 and the pad member 20 increases, so that the trailing side inclined portion 36 is formed at the trailing end of the groove portion 35. Then, as the frictional force increases, the protruding portion 23 rises obliquely along the trailing-side inclined portion 36 while the pad member 20 and the caliper 30 are deformed. The pad member 20 is also restricted from moving toward the circumferential trailing side by the trailing side regulating portion 33 of the caliper 30.

  Here, the above-mentioned couple loss area is centered on the midpoint M of the straight line connecting the contact point X1 or X2 where the pad member 20 contacts the caliper 30 and the rotation center O of the disk rotor 10, and the straight line is the diameter. It is known that an area of the pad member 20 in the area surrounded by the circle is drawn as a couple missing area.

  Accordingly, when the hydraulic pressure of the brake is low, the leading-side protruding portion 25 and the leading-side restricting portion 34 restrict the movement of the pad member 20 outward in the radial direction, and the protruding portion 23 and the groove portion 35 surround the pad member 20. By restricting the movement toward the directional trailing side, the contact point in the circumferential direction of the pad member 20 with respect to the caliper 30 can be made more radially inward of the disk rotor 10, so that the brake squeal is likely to occur. The force loss area can be reduced. Thus, by forming a slit in the portion of the pad member 20 that is the couple loss area, it is not avoided that the center of surface pressure enters the couple loss area, but by reducing the couple loss area itself, It is possible to avoid the pressure center from entering the uncoupled region. For this reason, in order to ensure the contact area of the pad member 20, it is not necessary to enlarge the disc brake apparatus 100. FIG. At this time, it is preferable that the pad member 20 does not contact the trailing side regulating portion 33 in the circumferential direction.

  In addition, since the circumferential load input to the groove portion 35 and the radially outward load input to the leading side regulating portion 34 are both transmitted to the fixing portion 31 as tension and compression force, the caliper 30 Deformation is suppressed, and a large braking force can be received without increasing or reinforcing the caliper 30.

  Further, when the brake hydraulic pressure is high, the vibration of the pad member 20 is suppressed and the frictional force between the disk rotor 10 and the pad member 20 is large, so that the surface pressure center is not greatly displaced. Therefore, although the couple loss region is larger than the case where the pad member 20 is received by the protruding portion 23 and the groove portion 35, the trailing-side regulating portion 33 positioned radially outward from the protruding portion 23 and the groove portion 35 is also padded. Even if the movement of the member 20 toward the circumferential trailing side is restricted, the brake squeal hardly occurs.

  The frictional force F2 can be expressed as F2 = μN2 where the friction coefficient μ is the pressing force N2 of the pad member 20. The rotational moment P2 around the contact X2 can be expressed as P2 = F2L2 / H2, where the frictional force F2, the circumferential distance L2 to the contact point, and the radial distance H2 to the contact point.

  As described above, according to the present embodiment, it is possible to stably suppress brake noise regardless of the magnitude of the brake hydraulic pressure (that is, the magnitude of the brake braking force).

  In this embodiment, the trailing-side restricting portion 33 and the leading-side restricting portion 34 are arranged at a substantially central position in the radial direction of the disk rotor 10 so as to prevent the pad member 20 from falling and to secure a desired frictional force. Even if the brake hydraulic pressure is high, it may be formed at a position shifted inwardly (downward in the vertical direction) from the substantially central position in the radial direction in order to reduce the couple slipping out region. .

  Further, in the present embodiment, the protruding portion 23 is formed at the center in the circumferential direction of the pad member 20, but, for example, when the hydraulic pressure of the brake is low at the time of forward movement, the groove portion 35 and the leading side restriction are formed. As long as the movement of the pad member 20 in the circumferential direction and the radial direction can be restricted only by the portion 34, the protruding portion 23 may be formed at any position between the pair of fixing portions 31.

1 is a plan view of a disc brake device 100 according to an embodiment of the present invention. It is a figure which shows the pad member 20 and the caliper 30 seen from the outer pad 22 side. FIG. 3 is a diagram showing a relationship between a pad member 20 and a caliper 30 when the cylinder mechanism 32 is at a low hydraulic pressure. FIG. 3 is a diagram showing a relationship between a pad member 20 and a caliper 30 when a cylinder mechanism 32 is at a high hydraulic pressure.

Explanation of symbols

10 Disc rotor 20 Pad member 23 Protruding part 30 Caliper 31 Fixing part 35 Groove part

Claims (7)

An annular disk rotor fixed to the axle;
A pad member that contacts the disk rotor from the axle direction;
A caliper that supports the pad member movably in the axle direction and restricts movement of the pad member in the circumferential direction and the radial direction of the disk rotor;
With
The caliper
A fixing portion for fixing the caliper to the vehicle body side;
A cylinder mechanism that presses the pad member against the disc rotor from the axle direction;
A disc brake device comprising:
The pad member includes a protruding portion that protrudes inward in the radial direction, and the caliper accommodates the protruding portion and restricts movement of the protruding portion toward the trailing side or the leading side and the pad. A disc brake device comprising a radial restricting portion for restricting movement of the member in the radially outward direction. The caliper
A trailing side regulating portion that is formed on the trailing side of the caliper outside the groove portion in the radial direction, and regulates movement of the pad member to the circumferential trailing side;
A trailing side inclined portion formed at the trailing side end of the groove and inclined in the circumferential direction of the disk rotor;
The trailing-side inclined portion is configured such that the trailing-side end portion of the pad member is moved to the trailing side when the disc rotor rotates to the trailing side and the pressing force of the cylinder mechanism exceeds a predetermined load. 2. The disc brake device according to claim 1, wherein the disc brake device is formed so as to guide the displacement of the pad member to a position where it abuts on the ring side regulating portion. The caliper
A leading side regulating portion that is formed on the leading side of the caliper outside the groove portion in the radial direction and regulates movement of the pad member to the circumferential leading side;
A leading side inclined portion formed at the leading end of the groove portion and inclined in the circumferential direction of the disc rotor;
The leading-side inclined portion is configured such that when the disc rotor rotates to the leading side and the pressing force of the cylinder mechanism exceeds a predetermined load, the leading-side end portion of the pad member is the leading-side regulating portion. The disc brake device according to claim 2, wherein the disc brake device is formed so as to guide the displacement of the pad member to a position where the pad member abuts against the disc.   4. The disc brake device according to claim 3, wherein the trailing side regulating portion and the leading side regulating portion are formed at a substantially center in the radial direction of the caliper.   The disc brake device according to any one of claims 1 to 4, wherein the fixing portion is provided on both sides of the groove portion in the circumferential direction.   The disc brake device according to any one of claims 1 to 5, wherein the groove portion is formed at the circumferential center of the pad member and at an inner side in the radial direction.   The disc brake device according to claim 1, wherein the cylinder mechanism is provided on one side of the disc rotor in the axle direction.

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