JP2008106850A - Friction pad assembly for disc brake, and disc brake device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a friction pad assembly improving braking characteristics by maintaining a stable friction area irrespective of deformation of a disc rotor. <P>SOLUTION: Positional regulation in a direction in parallel with disc rotor faces of a plurality of lining assemblies 6 swingably provided on a torque receiving plate 4, is carried out by fitting via a spring member 43 between an inner circumference face of a recessed part 4b formed on the torque receiving plate 4 and outer circumference faces of back plates of he lining assemblies 6. Positional regulation in a direction orthogonal to the disc rotor faces is carried out by abutting plate contact parts 62b of the back plates 62 of the lining assemblies 6 on an inner bottom face of the recessed part 4b. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a friction pad assembly for a disc brake that maintains a stable friction area regardless of deformation of the disc rotor and provides good braking characteristics, and a disc brake device for a vehicle that uses the friction pad assembly.

  The disk brake device includes a disk rotor fixed to an axle, a friction pad assembly in which a lining member is assembled on a disk rotor side surface of a torque receiving plate disposed to face the disk rotor, and the torque receiving plate as a disk. It has a built-in actuator that drives forward and backward toward the rotor and a brake caliper fixed to the vehicle body frame. When the torque receiving plate is advanced to the disk rotor side and the lining member is pressed against the disk rotor, Braking force is generated by sliding friction.

  In a disk brake device for a railway vehicle, the disk rotor and the friction pad assembly are large. Therefore, if the lining member to be pressed against the disk rotor is formed as an integral part, undulations generated in the disk rotor due to frictional heat, etc. The non-contact area increases, a stable friction area cannot be maintained, and stable braking characteristics cannot be obtained.

  Therefore, in order to solve such a problem, a plurality of second link plates are laid on a substantially flat surface on the torque receiving plate, and a plurality of first link plates are connected to each other on each second link plate. A plurality of lining assemblies are installed independently on each first link plate so as to be pivotable independently of each other, and each first link is moved by moving the torque receiving plate toward the disk rotor. A friction pad assembly has been proposed in which each lining assembly on a plate is brought into contact with a disk rotor (see, for example, Patent Document 1).

  In the friction pad assembly having such a configuration, each of the lining assemblies divided into small parts follows the undulation of the disk rotor surface and makes contact with the surface of the disk rotor in an individual swinging motion. To maintain a good braking characteristic.

Japanese National Patent Publication No. 10-507250

By the way, in the friction pad assembly described in Patent Document 1, the position regulation of the lining assembly on the torque receiving plate is performed in a direction parallel to the surface of the lining assembly and a direction orthogonal to the surface of the lining assembly. In either case, the lining assembly is pivotably connected to the first link plate by a spherical contact portion, and the first universal joint is used.
The position of the second link plate on the first link plate is restricted by the spherical contact portion in both the direction parallel to the surface of the lining assembly and the direction orthogonal to the surface of the lining assembly. Is performed by a second universal joint that is pivotally connected to the second link plate.

  As a result, all braking torques acting on the lining assembly during braking are transmitted in sequence from the lining assembly to the first link plate and from the first link plate to the second link plate via the spherical joint of the universal joint. Finally, the torque is transmitted to the torque receiving plate to which the second link plate is coupled, and each universal joint is made robust and the spherical contact portion of each universal joint is processed with high precision. Otherwise, an excessive load concentrates on some universal joints, which may cause damage.

  However, since there are many places where universal joints are used, all universal joints must have a robust structure, and the spherical contact portion and the mating contact portion with which the spherical contact portion contacts must be processed with high accuracy. As a result, there is a problem that the processing cost of the parts is increased, and the cost of the friction pad assembly is increased and the productivity is lowered.

  Further, the brake lining described in Patent Document 1 is for railway vehicles, and braking torque acting on the lining member during braking is applied in order from the lining member to the first link plate, and from the first link plate to the second link plate. Due to the transmission configuration, there are many components, and the device becomes large, so that it cannot be used for a disc brake device of a small vehicle such as a passenger car.

  Also, if the lining assembly rotates inadvertently due to contact with the disk rotor, it may cause uneven wear and brake noise, so a means to regulate the rotation of the lining assembly is required. When the number of parts increases, there is a problem that in this case as well, the cost is increased, and at the same time, the increase in the number of assembly steps accompanying the increase in parts causes a decrease in productivity.

  Accordingly, an object of the present invention is to solve the above-mentioned problems, maintain a stable friction area and improve braking characteristics, achieve cost reduction, improve productivity, and passenger cars, etc. It is an object of the present invention to provide a disc brake friction pad assembly and a disc brake device suitable as a brake device for a small vehicle.

The above object is achieved by the following configuration.
(1) A friction pad assembly for a disc brake according to the present invention includes a plurality of lining assemblies swingably supported on a torque receiving plate that is driven forward and backward toward a disc rotor, and the friction material of the lining assembly is provided. Is a disc brake friction pad assembly that is pressed against the disc rotor,
A plurality of recesses for receiving a back plate fixed to the back surface of the friction material of the lining assembly are formed on the surface of the torque receiving plate on the disk rotor side. A ring-shaped spring material is provided to fill the gap between the outer peripheral surface and the inner peripheral surface of the recess to hold the lining assembly;
The back plate of the lining assembly is formed in a curved surface whose outer peripheral surface is swingably held on the inner peripheral surface of the concave portion via the spring material, and the inner surface of the concave portion is formed at the center of the back surface. A plate contact portion that abuts on the bottom surface in a swingable manner is formed.

  (2) In the configuration described in (1) above, the inner circumferential surface of the recess and the outer circumferential surface of the back plate further restrict the rotation of the lining assembly in a plane along the disk rotor surface. A flat surface for preventing rotation is formed.

  (3) A vehicle disc brake device according to the present invention is configured such that the pair of friction pad assemblies according to (1) or (2) are disposed to face each other with a disc rotor interposed therebetween, and the pair of friction pad assemblies. And a caliper that is supported by the support with a built-in piston that presses the friction pad assembly against the disk rotor.

  According to the disk brake friction pad assembly described above, the deformation of the disk rotor can be followed by the swing of each lining assembly, and a stable friction area can be maintained regardless of the deformation of the disk rotor. Thus, the braking characteristic can be improved.

  In addition, the position of the lining assembly on the torque receiving plate is regulated in the direction parallel to the disk rotor surface of the lining assembly and the outer peripheral surface of the recess formed in the torque receiving plate and the back plate of the lining assembly. In the direction perpendicular to the disk rotor surface, the plate contact portion formed on the back surface of the backing plate of the lining assembly and the inner bottom surface of the recess on the torque receiving plate By contact with

  Therefore, the braking torque acting on the lining assembly during braking is transmitted from the lining assembly to the torque receiving plate via the spring material. The pressing force to the disk rotor is transmitted from the piston to the torque receiving plate, and acts on the lining assembly via the plate contact portion of the back plate of the lining assembly.

  In other words, the part that receives the braking torque from the lining assembly and the part that applies the pressing force to the lining assembly are set separately, and a large load is applied to the contact portion that applies the pressing force to the lining assembly. The braking torque does not work.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a disc brake friction pad assembly and a vehicle disc brake device according to the present invention will be described below in detail with reference to the drawings.
FIG. 1 to FIG. 6 show an embodiment of a vehicle disc brake device according to the present invention. FIG. 1 is a perspective view of the vehicle disc brake device as viewed obliquely from above, and FIG. 1 is a front view of the vehicle disc brake device as viewed in the direction of arrow A in FIG. 1, FIG. 3 is an exploded perspective view of the vehicle disc brake device shown in FIG. 1, and FIG. 4 is a sectional view taken along line BB in FIG. 5 is an exploded perspective view of the support shown in FIG. 3 and a pair of friction pad assemblies supported by the support. FIG. 6 is an exploded perspective view of the friction pad assembly shown in FIG.

  The vehicle disc brake device 1 according to this embodiment is a so-called floating caliper type disc brake device for a vehicle, and a pair of disc rotors 2 fixed to an axle and a pair arranged to face each other with the disc rotor 2 interposed therebetween. A pair of friction pad assemblies 8, 9 in which a plurality of (two in the illustrated example) lining assemblies 6 are assembled on the surface of the torque receiving plate (guide plate) 4 on the disk rotor 2 side, and an inner friction pad A cylinder portion 13 that accommodates a piston 11 for pressing the assembly 8 against the disc rotor 2 is formed on one side, and a caliper claw 15 that restricts the back surface of the outer friction pad assembly 9 is provided on the other side. The caliper 17 is fixed to the vehicle body side, and the pair of friction pad assemblies 8 and 9 and the caliper 17 are attached to the disc rotor 2. And a support 19 for movably floatingly supported in the direction.

  As shown in FIGS. 3 and 5, the support 19 includes a connecting portion 23 having a mounting hole 21 that is fixed to the vehicle body, and support rods 25 erected on both sides of the connecting portion 23. A pad clip 27 is attached to the inner surface of each support rod 25. As shown in FIGS. 3 to 5, the pad clip 27 is integrally formed of a metal plate, and the ears 4a formed on both sides of the torque receiving plate 4 of each friction pad assembly 8, 9 are discs. A groove-shaped pad guide portion 29 is formed which is slidably held in the axial direction of the rotor 2.

As shown in FIG. 1 and FIG. 2, the caliper 17 is provided with a connecting screw 31 provided on a pair of arm parts 17 a provided so as to protrude from the outer periphery of the cylinder part 13, on the upper end side of each support rod 25 of the support 19. Is supported by the support 19 so as to be slidable in the axial direction of the disk rotor 2.
The piston 11 mounted on the caliper 17 is operated by the hydraulic pressure supplied to the cylinder portion 13 according to the brake operation, and presses the friction pad assembly 8 against the disc rotor 2.

  In such a floating caliper type vehicle disc brake device 1, when the inner friction pad assembly 8 comes into contact with the disc rotor 2 due to the pressing by the piston 11, the caliper 17 is opposite to the piston 11 due to the reaction of the pressing action. As the caliper 17 moves, the outer friction pad assembly 9 whose rear surface is regulated by the caliper claw 15 is also pressed against the disc rotor 2, and as a result, the pair of friction pad assemblies 8, 9 Squeezes the disk rotor 2 to obtain a braking force.

The friction pad assemblies 8 and 9 in the present embodiment have the same configuration.
As shown in FIGS. 3 to 6, each friction pad assembly 8, 9 includes a torque receiving plate 4 having ears 4 a that are slidably supported by a pad guide 29 of the support 19 at both ends, Two ring-shaped spring members 43 fitted to and mounted on the inner peripheral surfaces of the two recesses 4b formed on the disk rotor 2 side of the torque receiving plate 4 in contact with the disk rotor 2, respectively. And two lining assemblies 6 each having a back plate 62 fixed to the back surface of the friction material 61 to be made.

The recess 4b of the torque receiving plate 4 accommodates the back plate 62 of the lining assembly 6 and holds the lining assembly 6 so as to be swingable.
The thickness of the back plate 62 is set to be slightly larger than the depth dimension of the recess 4b.

  The ring-shaped spring member 43 is a leaf spring that is formed into a ring shape that fits to the outer peripheral portion of the back plate 62 and is formed of a spring steel material that is excellent in rust prevention and wear resistance. The gap between the inner peripheral surface of the recess 4b is filled and the lining assembly 6 is held in the recess 4b.

The back plate 62 of the lining assembly 6 is a curved surface whose outer peripheral surface 62a is swingably held on the inner peripheral surface of the recess 4b via the spring member 43, as shown in an enlarged view C of the main part in FIG. Is formed. In addition, a convex spherical plate contact portion 62b is formed at the center of the back surface of the back plate 62 so as to swingably contact the inner bottom surface of the recess 4b.
The lining assembly 6 is formed on a curved surface and has an outer peripheral surface 62a that contacts the inner periphery of the recess 4b via a ring-shaped spring member 43, and a convex spherical plate contact portion 62b that contacts the inner bottom surface of the recess 4b. And is supported by the recess 4b in a swingable manner.

  As shown in FIG. 6, the ring-shaped spring material 43 is provided with a bent piece 43 a that is hooked on the back surface of the back plate 62. The bent piece 43a prevents the ring-shaped spring material 43 from falling off between the recess 4b and the back plate 62 due to vibration or the like. The ring-shaped spring material 43 includes spring portions 43b whose both ends are bent along flat surfaces 4c and 62c, which will be described later. The spring portions 43b are elastic to the back plate 62 with respect to the inner peripheral surface of the recess 4b. Acts to give

  In the case of the present embodiment, on the inner peripheral surface of the recess 4b and the outer peripheral surface of the back plate 62, a flat surface 4c for detent that restricts the rotation of the lining assembly 6 in a plane along the surface of the disk rotor 2 is provided. 62c is formed.

  In the friction pad assemblies 8 and 9 described above, the lining member pressed against the disk rotor 2 is composed of a plurality of lining assemblies 6 divided into small parts, and each lining assembly 6 swings. Because of this, the deformation of the disc rotor 2 can be followed by the swing of each lining assembly 6, and a stable friction area is maintained regardless of the deformation of the disc rotor 2, and the braking characteristics are good. Can be.

  In addition, the position of the lining assembly 6 on the torque receiving plate 4 is restricted with respect to the direction parallel to the disk rotor surface of the lining assembly 6 and the recess 4b formed on the torque receiving plate 4 and the lining assembly 6. The plate contact portion formed on the back surface of the back plate 62 of the lining assembly 6 with respect to the direction orthogonal to the disk rotor surface. The contact is made between 62 b and the inner bottom surface of the recess 4 b on the torque receiving plate 4.

Therefore, the braking torque acting on the lining assembly 6 during braking is transmitted from the lining assembly 6 to the torque receiving plate 4 via the spring member 43. The pressing force applied to the disk rotor 2 is transmitted from the piston 11 to the torque receiving plate 4 and acts on the lining assembly 6 via the plate contact portion 62 b of the back plate 62 of the lining assembly 6.
In other words, the portion that receives the braking torque from the lining assembly 6 and the portion that applies the pressing force to the lining assembly 6 are set separately, and the contact portion that applies the pressing force to the lining assembly 6 is large. The braking torque acting as a load does not work.
Therefore, the contact portion that transmits the pressing force does not need to be a solid engagement such as a ball joint that receives the braking torque, and it is possible to realize cost saving and productivity improvement by relaxing processing accuracy.

Further, since intermediate parts such as a link plate are not interposed in the transmission of the pressing force, the number of components is small, and the disc brake friction pad assemblies 8 and 9 can be made compact.
Further, since the spring material 43 is interposed between the outer peripheral surface of the back plate 62 of the lining assembly 6 on which a braking torque that becomes a large load acts and the inner peripheral surface of the concave portion 4b of the torque receiving plate 4, By forming the spring material 43 from a material excellent in rust prevention and wear resistance, the vibration resistance, corrosion resistance, and wear resistance at the contact portion are improved, and the friction pads for disc brakes 8, 9 are improved. Can extend the lifespan.

Further, in the friction pad assemblies 8 and 9 described above, uneven wear and brake noise may occur when the lining assembly 6 comes into contact with the disk rotor 2, so that the friction pad assemblies 8 and 9 must be in a plane parallel to the disk rotor surface. Means for restricting the rotation of the lining assembly 6 is required, and in this embodiment, the rotation restriction of the lining assembly 6 is a detent formed on the inner peripheral surface of the recess 4b and the outer peripheral surface of the back plate 62. This is realized by engagement of the flat surfaces 4c and 62c.
That is, since no independent dedicated parts are added to the turning regulation of the lining assembly 6 in a plane parallel to the disk rotor surface, the number of parts does not increase due to the turning regulation of the lining assembly 6. Thus, it is possible to avoid the occurrence of inconveniences such as an increase in cost due to an increase in parts and a decrease in productivity due to an increase in the number of assembly steps.

  In the vehicle disc brake device 1 employing the friction pad assemblies 8 and 9 suitable for compactness as described above, the support 19 and the caliper 17 are reduced in size in accordance with the compactness of the friction pad assemblies 8 and 9. Thus, a small disc brake device suitable for a small vehicle such as a passenger car can be obtained.

  In the friction pad assembly for a disc brake according to the present invention, the number of lining assemblies that are swingably mounted on the torque receiving plate is not limited to the above embodiment. Depending on the size of the disk rotor, it may be considered that three or more lining assemblies are swingably mounted on the torque receiving plate.

1 is a perspective view showing an embodiment of a vehicle disc brake device according to the present invention. It is A arrow directional view of FIG. FIG. 2 is an exploded perspective view of the vehicle disc brake device of FIG. 1. It is sectional drawing which follows the BB line of FIG. FIG. 4 is an exploded perspective view of the support and the friction pad assembly shown in FIG. 3. FIG. 6 is an exploded perspective view of the friction pad assembly shown in FIG. 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle disc brake apparatus 2 Disc rotor 4 Torque receiving plate 4b Recessed part 4c Flat surface 6 Lining assembly 8, 9 Friction pad assembly 11 Piston 13 Cylinder part 15 Caliper claw 17 Caliper 19 Support 21 Mounting hole 23 Connecting part 25 Support rod 27 Pad clip 29 Pad guide part 31 Connection screw 43 Ring-shaped spring material 43a Bending piece 61 Friction material 62 Back plate 62a Outer peripheral surface (curved surface)
62b Plate contact part 62c Flat surface

Claims (3)

A friction pad assembly for a disc brake in which a plurality of lining assemblies are swingably supported on a torque receiving plate that is driven forward and backward toward the disc rotor, and the friction material of the lining assembly is pressed against the disc rotor. And
A plurality of recesses for receiving a back plate fixed to the back surface of the friction material of the lining assembly are formed on the surface of the torque receiving plate on the disk rotor side. A ring-shaped spring material is provided to fill the gap between the outer peripheral surface and the inner peripheral surface of the recess to hold the lining assembly;
The back plate of the lining assembly is formed in a curved surface whose outer peripheral surface is swingably held on the inner peripheral surface of the concave portion via the spring material, and the inner surface of the concave portion is formed at the center of the back surface. A friction pad assembly for a disc brake, wherein a plate contact portion is formed on the bottom surface so as to be swingable.   A flat surface for preventing rotation that restricts rotation of the lining assembly in a plane along the disk rotor surface is formed on the inner peripheral surface of the recess and the outer peripheral surface of the back plate. Item 2. The disc brake friction pad assembly according to Item 1.   A pair of friction pad assemblies according to claim 1 or 2 are arranged opposite to each other with a disc rotor interposed therebetween, and a support that supports the pair of friction pad assemblies so as to be movable in the axial direction of the disc rotor; A disc brake device for a vehicle, comprising: a caliper incorporated in a piston for pressing a pad assembly against the disc rotor and supported by the support.

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