JP2001050316A - Disc brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To add an optimum mass to effectively retain the vibration of a carrier by forming a weight mount part on the carrier provided so as to straddle a disc rotor, and exchangeably mounting a weight on the weight mount part. SOLUTION: This vehicle disc brake A comprises a carrier 1 provided so as to straddle the circumferential side of a disc rotor integrally rotated with a wheel, and a pair of friction pads 5 is arranged on the carrier 1 so as to be located on both sides of the disc rotor. The friction pads 5 are pressed to both sides of the disc rotor by the operation of a caliper 3, whereby a braking force is obtained. In this case, cylindrical recessed parts 1J, 1K and 1L are formed on the connection parts 1P, 1Q of arm parts 1A, 1B with outer leg parts 1N, 1T of the carrier 1 and the connection part 1R of one outer leg part 1N with an outer connection part 1F, respectively. Cylindrical weights 4A-4C having a mass effective for restraining the vibration of the carrier 1 are pressed into the recessed part 1J, 1K and 1L.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake, and more particularly to a disc brake suitable for use in braking a vehicle or the like.

[0002]

2. Description of the Related Art Disc brakes are used as braking devices for vehicles such as automobiles.
A pair of friction pads arranged on both sides of a disk rotor that rotates integrally with the wheel, and a carrier that supports the pair of friction pads slidably in the disk rotor axial direction and is fixed to a non-rotating portion of the vehicle body. Having a caliper having a piston therein, which is movably supported by the carrier in the disk rotor axial direction, and when the brake pedal is operated, the pair of friction pads are pressed against the disk rotor by the caliper, respectively. This allows
This is to apply a braking force to the rotating disk rotor.

In the above-described disk brake, when the friction pad is pressed against the disk rotor to be operated, a noise may be generated from the disk brake.

[0004] This brake squeal is harsh and uncomfortable, so its suppression is required.

[0005] By the way, when the friction pad is pressed against the disk rotor and actuated, various kinds of brake squeals are generated due to vibrations of the respective parts of the disk brake caused by friction between the friction pad and the disk rotor. Known, in particular, the carrier has a special shape to be fixed to a non-rotating part of the vehicle body after supporting a pair of friction pads arranged on both sides of the disk rotor so as to be slidable in the axial direction of the disk rotor. Therefore, it is known that a portion outside the vehicle body, which is on a free end side with respect to a portion on the vehicle body fixed side as a fixed end, easily vibrates.

Therefore, conventionally, from the design stage in advance, the shape of the carrier itself has been configured to be hard to vibrate even when the friction pad is pressed against the disk rotor and actuated.

That is, in the conventional disc brake,
If the specifications of the vehicle body to which the carrier is fixed, the specifications of the disk rotor on which the friction pad is pressed, and the specifications of the friction pad that exerts a torque on the carrier are different, the vibrating part and the magnitude of the vibration in the carrier are different, and the brake Since the squealing noise also differs, the parts where vibration is likely to occur and the magnitude of the vibration are reviewed in advance in the design stage according to these specifications, etc., and the mass where the vibration is likely to occur is appropriately increased (build-up). Thus, the shape of the carrier is such that it does not easily vibrate even when the friction pad is pressed against the disk rotor and actuated.

Further, since the vibration of the disc brake is caused by the friction between the friction pad and the disc rotor as described above, the turning in and out directions of the disc rotor with respect to the disc brake are reversed for the right wheel and the left wheel. Therefore, the parts of the carrier that are likely to cause vibration are also symmetrical for the right wheel and the left wheel, so the carrier shape must also be symmetrical for the right wheel and the left wheel Was.

[0009]

By the way, in the conventional disk brake, the carrier is manufactured by casting or pressing.

Therefore, if it is attempted to appropriately increase (build up) the mass of a portion where vibration is likely to occur in order to suppress the brake squeal noise, the portion where the mass is increased (build up) or the increased mass is increased. If they are different, the shape of the carrier will naturally differ, so special molds and press dies will be required according to the part where the mass is increased (build-up) and the difference in the increased mass, which will increase the carrier manufacturing cost. There was a problem that would.

[0011]

In order to solve the above-mentioned problems, the present invention provides a carrier fixed to a non-rotating portion of a vehicle and provided so as to straddle an outer peripheral side of a disk rotor which rotates integrally with wheels. A pair of friction pads disposed on both sides of the disk rotor and supported by the carrier so as to be movable in the axial direction of the disk rotor; and the pair of friction pads provided so as to straddle the outer peripheral side of the disk rotor. A disc brake for a vehicle comprising a caliper for pressing a pad against both surfaces of the disc rotor,
A weight attachment portion is formed on the carrier, and a weight is attached to the weight attachment portion.

A plurality of weight mounting portions are formed on the carrier in a predetermined symmetrical relationship, and a weight is mounted on at least one of the plurality of weight mounting portions.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG.
This will be described with reference to FIG.

In the drawings, reference symbol A denotes a disc brake according to the embodiment of the present invention, which is indicated by lines CC and C'-C 'shown in FIGS.
Indicates the axis of symmetry of the disc brake A which is substantially symmetrical.

Reference numeral 1 denotes a carrier for supporting a working portion-side friction pad and a reaction portion-side friction pad, which will be described later. The carrier 1 is formed of an FCD casting, and is provided inside a vehicle body of a disk rotor 7 which rotates integrally with wheels. A pair of inner legs 1C and 1D, which are arranged on the (inner side) at a fixed interval in the circumferential direction of the disk rotor 7 and extend from the inner circumferential side to the outer circumferential side of the disk rotor 7, correspond to the pair of inner legs 1C and 1D, respectively. A pair of outer legs 1N, 1T are arranged on the outer side of the vehicle body (outer side) with a certain interval in the circumferential direction of the disk rotor 7 and extend from the inner circumferential side to the outer circumferential side of the disk rotor 7 with the disk rotor 7 interposed therebetween. Have.

In the circumferential direction of the disk rotor 7, one inner leg 1 C and one outer leg 1 N are formed such that their outer peripheral ends are connected to each other by an arm that straddles the outer peripheral side of the disk rotor 7. Connected together by 1A,
Also, the other inner leg 1D and the other outer leg 1T
Also, the ends on the outer peripheral side are integrally connected by an arm 1B straddling the outer peripheral side of the disk rotor 7.

The inner leg 1C and the other inner leg 1D are integrally connected to each other by connecting portions 1E extending in the circumferential direction of the disk rotor 7 so that the inner ends of the respective disk rotors 7 are connected to each other. Also, the outer leg 1N and the outer leg 1T are integrated by an outer connecting portion 1F in which the inner peripheral ends of the respective disk rotors 7 extend in the circumferential direction of the disk rotor 7. It is connected to the.

The connecting portion 1E is provided with two mounting holes 1G at positions evenly spaced from the center in the longitudinal direction to the left and right. The carrier 1 is inserted through the mounting holes 1G with bolts or the like so that the vehicle 1 is not shown. It is designed to be fixed to the non-rotating part.

The arm portions 1A and 1B are formed with bottomed guide holes 1H and 1I extending from the inner side to the outer side along the axial direction of the disk rotor 7, respectively. The pins 2A and 2B provided on the caliper 3 are slidably inserted through the respective openings on the side.

The caliper 3 has the same FCD as the carrier 1.
The cylinder part 3C, which is formed of a casting, is disposed on the inner side of the disk rotor 7, the claw part 3A is disposed on the outer side of the disk rotor 7, and the cylinder part 3C extending over the outer periphery of the disk rotor 7. A disc path portion 3D that integrally connects the claw portion 3A and the claw portion 3A is generally configured. The cylinder portion 3C of the caliper 3 includes an actuator including a cylinder 10 opened to the disk rotor 7 side and a piston 11 provided in the cylinder 10, and is disposed between the piston 11 and the disk rotor 7, The working-part-side friction pad 6 slidably supported in the axial direction of the disk rotor 7 by the pair of inner legs 1C and 1D of the carrier 1 is moved inside the cylinder 10 based on a hydraulic pressure supplied from the outside. It is configured to be pressed by the movable piston 11.

On the other hand, the claw 3A of the caliper 3 is formed on the outer side of the disk rotor 7 so as to extend from the radially outer side of the disk rotor 7 to the inner side.
And a pair of outer legs 1N and 1T of the carrier 1 between the disk rotor 7 and the outer side of the disk rotor 7.
The reaction portion-side friction pad 5 is disposed so as to be slidably supported in the axial direction.

The cylinder portion 3C of the caliper 3
A pair of arms 3 is provided on both sides of the disk rotor 7 in the circumferential direction.
E, 3F, and the pair of arms are provided with the aforementioned pins 2A, 2B.
Is fixed to one end on the inner side with a bolt or the like.

That is, the caliper 3 is supported by the carrier 1 via the pins 2A and 2B so as to be movable in the axial direction of the disk rotor 7.

The guide holes 1H, 1H of the pins 2A, 2B
I, the portions exposed from the guide holes 1H and 1I are covered with rubber boots 2C and 2D.
Foreign matter is prevented from entering the sliding portion between A, 2B and the guide holes 1H, 1I.

The connecting portions 1P, 1Q of the arms 1A, 1B of the carrier 1 with the outer legs 1N, 1T are provided with cylindrical concave portions 1J, 1K (weight mounting portions) for press-fitting the weights. Have been.

Also, one outer leg 1N of the carrier 1
A cylindrical recessed portion 1L (weight attachment portion) for press-fitting a weight is provided at a connection portion 1R between the outer leg portion 1T and the outer connection portion 1F. 1S is provided with a cylindrical concave portion 1M (weight attachment portion) for press-fitting the weight.

The diameters of the four recesses are the same. Here, the recesses 1J and 1K are located substantially symmetrically with respect to the symmetry axes CC and C′-C ′,
L and 1M are substantially symmetrical with respect to the symmetry axes CC and C′-C ′.

And, among the four concave portions, 1J,
To 1K and 1L, columnar weights 4A, 4B and 4C having concentric columnar protrusions on one end side are mounted by press-fitting the protrusions into recesses 1J, 1K and 1L, respectively.

Each of the weights 4A, 4B, and 4C has the same diameter of the cylindrical protrusion, and is slightly larger than the diameter of the cylindrical recess of each of the recesses 1J, 1K, and 1L. ,
The weights 4A, 4B, and 4C are fixed to the carrier 1 by press-fitting the protrusions of 4C into the recesses 1J, 1K, and 1L, respectively. As described above, the four concave portions 1J, 1K,
Since the cylindrical recesses of 1L and 1M have the same diameter, each weight can be press-fitted into any of the four recesses.

Each of the weights 4A, 4B and 4C is made of a material having a higher density than the FCD casting, which is a material forming the carrier 1, for example, steel or a lead alloy. As a result, the mass is adjusted to an effective value for suppressing the vibration of the carrier 1 obtained by the analysis.
With the aim of suppressing the vibration around KHz, the weight 4A is 10
g, weight 4B is adjusted to 20 g, and weight 4C is adjusted to 15 g.

Next, the operation of the disk brake according to the embodiment of the present invention configured as described above will be described.

When the driver operates the brake pedal, hydraulic oil is sent from outside to the cylinder 10 inside the caliper 3, and hydraulic pressure is generated.

The hydraulic pressure causes the piston 11 inside the caliper 3 to move forward and press the working portion side friction pad 6 which is in contact with the piston 11 against the disk rotor 7. Disk rotor 7
The caliper 3 moves its cylinder 10
The side slides in a direction away from the disk rotor 7.

Then, the claw 3A of the caliper 3 presses the reaction portion side friction pad 5 against the disk rotor 7.

In this way, the working portion side friction pad 6 and the reaction portion side friction pad 5 are paired to clamp the disk rotor 7 from both sides, thereby braking the wheels.

Here, the disk brake A is mounted on the right wheel of the vehicle, and the disk rotor is turned into the disk brake A from the left side in FIGS.

At the time of braking, the friction vibration generated between the friction pads 5 and 6 and the disk rotor 7 causes the friction pads 5 and 6 to rotate.
6 is transmitted to the carrier 1 that supports the carrier 6, but since the connecting portion 1E of the carrier 1 is fixed to the vehicle body, vibration is less likely to occur on the inner side of the carrier 1.

However, the connecting portions 1P and 1Q of the pair of arms 1A and 1B on the outer side of the carrier 1 and the pair of outer legs 1N and 1T, and the pair of outer legs 1N and 1N,
Since the connecting portions 1R and 1S between the 1T and the outer connecting portion 1F are separated from the connecting portion 1E which is a portion fixed to the vehicle body, vibration is likely to occur.

Here, the disc brake A is mounted on the right wheel of the vehicle, and the vibration of 2.4 to 2.5 KHz which is to be suppressed in the present embodiment is one of the connecting portions.
Analysis has shown that it is likely to occur at three points, P, 1Q, and 1R.

However, in the disc brake according to the present embodiment, the weights 4A, 4A, 4C having the optimum mass for suppressing the vibration of the carrier 1 are respectively connected to the connecting portions 1P, 1Q, 1R.
By attaching B and 4C, generation of vibration in the carrier 1 can be suppressed, and therefore, brake squeal can be prevented.

In this embodiment, the weight mounting portions 1J, 1
K is a connection portion 1P, 1Q between the arm portions 1A, 1B and the outer leg portions 1N, 1T, a weight attachment portion 1L, 1M is a
N, 1T and the connecting portion 1R of the outer connecting portion 1F, respectively.
1S, each weight mounting portion 1J, 1K and 1L,
1M is located at the free end side of the arms 1A and 1B and at the free end side of the outer legs 1N and 1T, respectively, so that the mass of the weights of the arms 1A and 1B and the outer legs 1N and 1T respectively. Vibration (arm 1A, 1B and outer leg 1
N, 1T, which is the portion of the vehicle fixed to the vehicle, that is, the vibration of the connecting portion 1E) can be effectively suppressed.

Here, each of the weights 4A, 4B and 4C is an FCD.
It is formed of a substance having a higher density than the casting, and has a small volume and a sufficient mass, and each of the weights 4A, 4B, 4
C is pressed into a concave portion provided in the carrier 1 by pressing a columnar convex portion, which is a part of C, so that each of the weights 4A, 4B, 4C
Even when is mounted on the carrier 1, the increase in the volume of the disc brake A due to the attachment of the weight is kept small, and the disc brake A can be mounted inside the wheel without interfering with the wheel (not shown).

Then, the disc brake A of the present embodiment
Indicates that the concave portions 1J and 1K, which are the weight attachment portions, have the axis of symmetry CC.
And C′-C ′ are located symmetrically with respect to each other, and the concave portions 1L and 1M, which are weight attachment portions, are symmetrical with the axes of symmetry CC and C′-C.
Since the disk brake A is mounted on the left wheel of the vehicle because it is located symmetrically with respect to C ', the weight 4A is mounted on the recess 1K, the weight 4B is mounted on the recess 1J, and the weight 4C is mounted on the recess 1M. With the same carrier, it is possible to provide a disc brake to which a weight having an optimum mass for attachment to the left wheel of a vehicle is added.

When the disc brake is mounted on a different vehicle model, each weight is changed to a weight having an appropriate weight, so that a disc brake having the same carrier and a weight having an optimum mass for mounting on the different vehicle model is added. be able to.

In this embodiment, the weight has a cylindrical shape, and the portion to which the weight is added is defined by the arms 1A, 1A of the carrier 1.
B and the outer connecting portion 1F of the carrier 1
And the weight of each weight is 10 g for weight 4A, 20 g for weight 4B, and 1 for weight 4C.
The weight is 5 g, but is not limited thereto, and the shape of the weight, the position where the weight is added, the number thereof, and the mass of each weight can be changed as appropriate.

In this embodiment, the carrier 1
Although the weight is made of a material having a higher density than that of the material of the carrier 1, a material having the same or lower density as the material of the carrier 1 may be used as long as there is no obstacle in mounting the disc brake to the vehicle body in the wheel.

In the present embodiment, the carrier 1
Although the concave portion is provided on the side and the convex portion is provided on the weight, the present invention is not limited to this, and the concave and convex portions may be reversed.

The recesses 1J, 1K, 1
L and 1M may be provided considerably large and deep, and the weights may be changed by changing the heights of the respective weights to be equal in diameter, so that the entire weights may be pressed into the recesses.

In the present embodiment, the method of adding the weight is press-fitting of the convex portion into the concave portion. However, the present invention is not limited to this, and may be screwed, caulked, bonded, welded, or the like.

Further, in the present embodiment, the carrier and the caliper are formed by casting. However, the present invention is not limited to this. The carrier and the caliper may be formed by pressing or shaving, or other forming methods.

[0051]

As described above, the present invention relates to a carrier fixed to a non-rotating portion of a vehicle and provided so as to straddle an outer peripheral side of a disk rotor which rotates integrally with wheels, and a carrier provided on both sides of the disk rotor. A pair of friction pads arranged and supported by the carrier so as to be movable in the axial direction of the disk rotor, and the pair of friction pads provided so as to straddle the outer peripheral side of the disk rotor are provided on both surfaces of the disk rotor. A disc brake for a vehicle comprising a caliper for pressing, wherein a weight mounting portion is formed on the carrier, and a weight is mounted on the weight mounting portion, whereby the original brake performance is improved. Disc brakes that can share the structure of the carrier have different characteristics, such as the presence or absence of squeal and the squeal characteristics such as frequency, due to differences in vehicle types. Even if the magnitude of the mass to be added at the position where the mass is added is different, by changing the mass of the weight attached to the weight attachment position, the optimal mass is added by the carrier formed by one mold. And vibration of the carrier can be suppressed.

In the above-mentioned disc brake,
A plurality of the weight attachment portions are formed on the carrier in a predetermined symmetric relationship, and at least one of the plurality of weight attachment portions is provided.
By mounting the weights on one of the weights, even in the case where the occurrence of vibration is different due to a difference or the like, by changing the weights mounted on the plurality of weight mounting portions to predetermined symmetric positions. (1) With a carrier formed by one mold, an optimum mass can be added to each part, and vibration can be suppressed efficiently.

Therefore, if the disc brake can share the structure of the carrier and the caliper with respect to the original braking performance, only one carrier mold is required, even if the squealing characteristics such as the presence or absence of squealing and the frequency are different. This is effective in reducing costs.

[Brief description of the drawings]

FIG. 1 is a top view of a disc brake according to an embodiment of the present invention, and is a partially cut-away view.

FIG. 2 is a view of the disk brake according to the embodiment of the present invention as viewed from an outer side, and does not show a disk rotor.

[Explanation of symbols]

 A Disc brake CC Symmetry axis C'-C 'Symmetry axis 1 Carrier 1A, 1B Arm 1C, 1D Inner leg 1E Connection 1F Outer connection 1G Mounting hole 1H, 1I Guide hole 1J, 1K Recess 1L, 1M Recess 1N, 1T Outer leg 1P, 1Q Connection 1R, 1S Connection 2A, 2B Pin 2C, 2D Rubber boot 3 Caliper 3A Claw 3C Cylinder 3D Disk path 3E, 3F Arm 4A, 4B, 4C Weight 5 Reaction Part side friction pad 6 Working part side friction pad 7 Disk rotor 10 Cylinder 11 Piston

Claims (2)

[Claims] 1. A carrier fixed to a non-rotating portion of a vehicle and provided so as to straddle an outer peripheral side of a disk rotor that rotates integrally with a wheel, and a carrier disposed on both sides of the disk rotor and in an axial direction of the disk rotor. A vehicle comprising: a pair of friction pads movably supported by the carrier; and calipers provided so as to straddle the outer peripheral side of the disk rotor and pressing the pair of friction pads against both surfaces of the disk rotor. A disc brake for a vehicle, wherein a weight mounting portion is formed on the carrier, and a weight is mounted on the weight mounting portion. 2. The weight mounting portion according to claim 1, wherein a plurality of weight mounting portions are formed on the carrier in a predetermined symmetrical relationship, and a weight is mounted on at least one of the plurality of weight mounting portions. Disc brake described.