JP2000110859A - Disc brake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure, preventing the occurrence of deviated wear of the lining of a pad, at low cost. SOLUTION: A support 2b is symmetrically formed about the rotation direction of a rotor and a piston 6 is arranged in a central position. Instead of the above, a pad 5a(5a') is asymmetrically formed and the center of a lining 7(7') is further deviated to the around-in side than a center at which the piston 6 presses the pad 5a(5a'). Regardless of a retraction force based on friction between the lining 7(7') and the rotor, a friction force between the lining 7(7') and the rotor is approximately uniformalized and deviated wear is prevented from occurring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The disc brake according to the present invention is used for braking an automobile, and the present invention is intended to prevent the pad incorporated in such a disc brake from being unevenly worn, so that it can be used for a long time. Thus, a good braking force can be obtained.

[0002]

2. Description of the Related Art Conventionally, a disk brake having a structure as shown in FIGS. 5 and 6 has been used as a disk brake for braking an automobile. The disk brake shown in FIGS. 5 and 6 is described in Japanese Patent Application Laid-Open No. 55-123029, and has a support provided adjacent to one side of the rotor 1 which rotates together with wheels (not shown). 2 is fixed to a vehicle body (not shown) via mounting holes 23 provided in a lower portion of the support 2. The caliper 20 is supported on the support 2 so as to be displaceable in the axial direction of the rotor 1. In addition, a pair of front and rear engaging portions 3 and 4 are provided at a part of the support 2 at positions separated in the circumferential direction of the rotor 1. These engaging portions 3, 4
The front end is bent in a U-shape so as to straddle the outer peripheral portion of the rotor 1 in the vertical direction in FIGS. 5 and 6, and both ends of the pads 5, The rotor 1 is slidably engaged in the axial direction. The pads 5, 5
The caliper 20 having the cylinder portion 21 and the caliper claw 22 is disposed so as to straddle the
1 has a built-in piston 6 for pressing the pad 5 against the rotor 1.

[0003] As another disk brake, a structure as shown in FIG. 8 is conventionally known. In this disc brake, a pad 5 and a piston 6 pressing the pad 5 against the side surface of the rotor 1 are connected to each other by central axes O ₁ and O _2.
They are arranged so that they match each other. In the case of such a disc brake, the pressure of the pad 5 against the rotor 1 is p.
Is highest on the inflow side (the left side in FIG. 8) of the rotor 1, decreases from the center toward the outflow side, and tends to be near zero at the outflow side end. This is for pad 5
This is due to the fact that a pull-in force due to friction acts on the inflow side of the rotor 1. The pressing pressure p at both ends of such a pad 5
The extreme imbalance causes vibration in the pad 5 and causes abnormal noise called braking, and also causes uneven wear in the lining 7 of the pad 5.

[0004] In contrast, at the disc brake illustrated in Figures 5-6 above, the central axis O ₂ of the piston 6 and the caliper claw 22, the center axis O ₁ rotor 1 than the pads 5,5 Is eccentric by a predetermined amount e on the outlet side of the motor. Therefore, the friction pad 5 from the piston 6 and the caliper claw 22
Center of the pressing force exerted on the 5, located on the exit side of the rotating the rotor 1 from the center axis O ₁ of the pad 5,5, a result,
The pull-in force acting on each of the pads 5, 5 is reduced by the rotor 1, and as shown in FIG. And increases on the exit side.

That is, when the vehicle is braked by the disc brakes shown in FIGS. 5 and 6, the center of the piston 6 pressing the pad 5 is located closer to the outlet side of the rotor 1 than the center of the pad 5. , The force applied to the pad 5 by the lining 7 of the pad 5 against the side surface of the rotor 1 during braking becomes substantially uniform from the inflow end to the outflow end, and uneven wear of the lining 7 is prevented. .

[0006]

In the case of the conventional structure shown in FIGS. 5 and 6, a sufficient effect can be exhibited from the viewpoint of preventing uneven wear of the linings 7 and 7, but it is not possible to share parts and the cost is reduced. Inevitably increases. That is, it is necessary to install the disc brakes having the same performance on both the left and right sides of the vehicle, but the mounting directions are reversed in the left and right. Therefore,
In the case of the structure shown in FIGS. 5 and 6, it is not possible to use parts (calipers and supports) of the same shape on the right and left sides of the vehicle. These parts (calipers, etc.) are cast products of iron or light alloy, and the production cost of the mold for casting increases.
If it is not possible to share the caliper and the like on the left and right, it is not preferable because the cost of the entire disc brake increases. In view of such circumstances, the disc brake of the present invention, even when parts are manufactured with a single type of casting mold,
The present invention has been made to realize a structure capable of preventing uneven wear of the lining.

[0007]

In each of the disc brakes according to the present invention, like a conventionally known disc brake, a support fixed to a vehicle body by straddling a rotor that rotates with wheels, and a rotor of the support are provided. In the sandwiching position,
A pair of a revolving-side engaging portion and a revolving-side engaging portion provided at each of a revolving-side end of the rotor and a revolving-side end of the rotor; The mating portion includes a pair of pads each of which has both ends slidably engaged in the axial direction of the rotor, a caliper attached to the support, and a piston built in the caliper. Then, with the pushing of the piston, the rotor is clamped by the pair of pads to perform braking.

In particular, in the disk brake according to the first aspect, the center of pressing of the piston is substantially at the center of the length of the support in the circumferential direction of the rotor, and each of the pads is constituted. The lining is shifted to the reciprocating side of the rotor with respect to the circumferential direction of the rotor with respect to the back metal similarly constituting each of these pads. Thereby, the center of the lining is shifted to the reversing side of the rotor with respect to the pressing center of the piston.

Further, in the disk brake according to the present invention, the pressing center of the piston is substantially at the center of the length of the support with respect to the circumferential direction of the rotor, and the circumferential direction of the rotor is The inbound side above,
The distance between the two engaging portions on the feed-out side is set smaller than a dimension capable of supporting the pads at the time of casting the support.
Then, each of the engagement portions on the inflow side and the outflow side is machined so that the center of the lining constituting each pad is shifted to the inflow side of the rotor from the center in the longitudinal direction of the support. The distance between the two engaging portions on the inflow side and the outflow side is adjusted to a size capable of supporting each of the pads, and the center of the lining constituting each of these pads is set on the inflow side of the rotor with respect to the pressing center of the piston. It is shifted.

[0010]

In each of the disc brakes of the present invention constructed as described above, the center of the lining constituting the pad is the same as that of the conventional disc brake shown in FIGS.
The pad is shifted from the center of the piston pressing the pad toward the reciprocating side of the rotor. For this reason, regardless of the retraction force based on the frictional force acting between the lining of the pad and the side surface of the rotor during braking, the force by which the lining is pressed against the side surface of the rotor extends from the inflow end to the outflow end. Is almost uniform. Then, uneven wear of the lining is prevented.

In particular, in the case of the disc brake of the present invention, the caliper and the unfinished support after casting can be shared between the disc brakes to be assembled on the left and right sides of the automobile, so that the cost can be reduced. First, in the case of the disc brake described in claim 1, the center of the lining and the center of pressing the piston are shifted by shifting the lining constituting each pad with respect to the backing metal, so that the shape of the support is changed. May be symmetrical with respect to the circumferential direction.
In this case, it is not necessary to make the shapes of the calipers to be used on the left and right sides different. Further, in the case of the disk brake according to the present invention, after the support is cast, the center of the lining constituting each pad is shifted from the center in the longitudinal direction of the support toward the reciprocating side of the rotor. Entrance side,
By machining each engaging portion on the outlet side, each pad is shifted toward the inlet side with respect to this support, and the center of the lining and the pressing center of the piston are shifted. Therefore, with respect to the support cast from a single type of mold, it is possible to obtain the support for the disc brakes on both the left and right sides only by machining the lining so that the center of the lining is shifted to the inflow side of the rotor. Also in this case, it is not necessary to make the shapes of the calipers used on the left and right sides different.

[0012]

1 and 2 show a first embodiment of the present invention corresponding to claim 1. FIG. A support 2b provided across the rotor 1 (see FIGS. 5 and 6; omitted from FIGS. 1 to 4) that rotates together with the wheels is fixed to a suspension device provided on the vehicle body side. At the position where the support 2b sandwiches the rotor 1, the reciprocating side end of the rotor 1 (when the vehicle moves forward, the rotor 1 rotates from right to left in FIG. 1 as indicated by an arrow b in FIG. In this case, a pair of the inlet-side engaging portion 3b and the outlet-side engaging portion 4b is provided at each of the outgoing-side end portion (same as the left-end portion) of the rotor 1 and the outgoing-side engaging portion 4b. Then, the both ends of the backing plates 8 and 8 ′ constituting the pads 5 a and 5 a ′ are respectively attached to the inflow side and the outflow side engagement portions 3 b and 4 b in the axial direction of the rotor 1 (the front and back direction in FIG. 1). ). In this state, the pair of pads 5a, 5a 'are provided at positions sandwiching the rotor 1.

A caliper (not shown) is supported on the support 2b so as to be displaceable in the axial direction of the rotor 1. Then, the end surface of the piston 6 fitted to the cylinder 13 provided in the caliper is abutted against the back surface of the back metal 8 constituting the pad 5a on the inner side (the side which is the center in the width direction when assembled to the vehicle). ing. On the contrary,
The inner surface of the caliper claw fixed to the caliper is abutted against the back surface of the back metal 8 ′ that constitutes the pad 5 a ′ on the outer side (the side that becomes the widthwise outside when assembled to the vehicle). At the time of braking, the piston 6 is pushed out by sending pressure oil into the cylinder 13 and the piston 6
By pressing the pair of pads 5a, 5a 'toward both side surfaces of the rotor 1 between the end surface of the rotor and the inner surface of the caliper claw, braking is performed.

In particular, in the disc brake of the present embodiment, the center of pressing of the piston 6 is substantially at the center of the length of the support 2b in the circumferential direction of the rotor 1. At the same time, the linings 7, 7 ′ constituting the respective pads 5 a, 5 a ′ are also
a, 5a ', with respect to the back metal 8, 8' with respect to the circumferential direction of the rotor 1, the reciprocating side of the rotor 1 (FIGS. 1-2).
To the right). In the illustrated example, the inflow side,
Both ends of each of the backing plates 8 and 8 'in the circumferential direction of the rotor 1 to be engaged with both the inflow side and outflow side engagement grooves 9 and 10 formed in the outflow side engagement portions 3b and 4b. The lengths of the inflow side and outflow side protruding pieces 11, 11 ', 12, 12' are different from each other. That is, each of the pads 5a,
5a ', the outgoing-side projecting pieces 12, 12' are longer than the inward-side projecting pieces 11, 11 '. Therefore, in a state where the revolving side and the revolving side protruding pieces 11, 11 ', 12, 12' are engaged with the revolving side and the revolving side engaging grooves 9, 10 respectively, the respective pads The centers of the linings 7, 7 ′ constituting 5 a, 5 a ′ are shifted to the reciprocating side of the rotor 1 with respect to the pressing center of the piston 6.

The disc brake of the present embodiment constructed as described above has the center of the linings 7, 7 'constituting the pads 5a, 5a', similarly to the conventional disc brake shown in FIGS. However, the center of the rotor 6 is displaced from the center of the caliper claw (not shown) and the piston 6 pressing the pads 5a and 5a '. For this reason, the linings 7, 7 'are attached to the side surfaces of the rotor 1 regardless of the pull-in force based on the frictional force acting between the linings 7, 7' of the pads 5a, 5a 'and the side surfaces of the rotor 1 during braking. The pressed force becomes substantially uniform from the inflow end to the outflow end. That is, the pull-in force acts in a direction to increase the force on the inflow side, whereas the pressing centers of the pads 5a, 5a 'are shifted to the outflow side as described above. Assuming that there is no retraction force, the force with which the linings 7, 7 'are pressed against the side surface of the rotor 1 is lower on the reversing side. These cancel each other out, and the force with which each of the linings 7, 7 'is pressed against the side surface of the rotor 1 becomes substantially uniform from the inflow end to the outflow end, and the bias of the linings 7, 7' is increased. Wear is prevented.

In particular, in the case of the disc brake of this embodiment, the linings 7, 7 'constituting the pads 5a, 5a' are shifted with respect to the backing plates 8, 8 'so that the linings 7, 7' The center is deviated from the pressing center of the piston 6 and the caliper claw. Therefore, the shape of the support 2b may be symmetrical in the circumferential direction. In this case, it is not necessary to make the shapes of the calipers to be used on the left and right sides different. As a result, the caliper and the support 2b having the same shape can be used to form the left and right disc brakes, and the cost can be reduced by reducing the types of parts. In addition, since the said back metal 8, 8 'is made by stamping a steel plate by pressing, it can be manufactured at low cost.

Next, FIGS. 3 and 4 correspond to claim 2.
9 shows a second example of the embodiment of the present invention. Also in the case of the present example, the center of pressing of the piston 6 built in the caliper (not shown) is set at substantially the center of the length of the support 2c in the circumferential direction of the rotor 1. In particular, in the case of the present example, at the time of casting of the support 2c, the interval between the inward and outward engaging portions 3b, 4b in the circumferential direction of the rotor 1 is indicated by a two-dot chain line in FIG. In this way, the size is smaller than the size that can support each pad 5b.

The support 2c, after casting, prior to combining with the caliper and the pad 5b, removes a portion requiring precision by machining. The inflow-side and outflow-side engagement portions 3b and 4b are also shaved to ensure dimensional accuracy, and the surfaces of the inflow-side and outflow-side engagement grooves 9 and 10 are flattened. In the case of this example, when the inflow side and outflow side both engaging portions 3b and 4b are scraped off, the center of the lining 7 constituting each pad 5b is centered in the longitudinal direction of the support 2c. Each of the engagement portions 3b and 4b is machined so that the engagement portions 3b and 4b are shifted more toward the inflow side of the rotor 1, and the inflow side engagement portions 3b are separated from the outflow side engagement portions 4b. The distance between the engaging portions 3b and 4b is adjusted to a size that can support the pads 5b. Thereby, the lining 7 constituting each of these pads 5b is formed.
Is shifted toward the reciprocating side of the rotor 1 with respect to the pressing center of the piston 6.

Also in the case of the disk brake of the present embodiment having the above-described structure, the lining 7 forming each of the pads 5b is also provided.
The center of the rotor 1 is displaced from the center of the piston 6 and the caliper claw that presses each of the pads 5b to the reciprocating side of the rotor 1. Therefore, irrespective of the pull-in force based on the frictional force acting between the lining 7 of each pad 5b and the side surface of the rotor 1 during braking, the force by which the lining 7 is pressed against the side surface of the rotor 1 is applied to the inflow end. The lining 7 can be prevented from being unevenly worn by making the lining 7 substantially uniform from the end to the outlet end.

In the case of the disc brake of this embodiment,
After the casting of the support 2c, the engaging portions 3b and 4b are machined so that the center of the lining 7 is shifted from the center of the support 2c in the longitudinal direction to the inlet side of the rotor 1. By the fact, each pad 5
b is shifted to the reciprocating side, so that the center of the lining 7 and the pressing center of the piston 6 and the caliper claw are shifted. Therefore, with regard to the support 2c cast from a single type of mold, the support for the disc brakes on both the left and right sides can be obtained only by machining the center of the lining 7 so as to be shifted to the inflow side of the rotor 1. Cost can be reduced by reducing the number of types. Further, in the case of this example, as in the case of the above-described first example, the calipers can be shared on both the left and right sides, and from this aspect, the cost can be reduced by reducing the types of parts.

[0021]

Since the disk brake of the present invention is constructed and operates as described above, a structure capable of preventing uneven wear of the pad lining can be realized at low cost.

[Brief description of the drawings]

FIG. 1 is a front view showing a first example of an embodiment of the present invention with a part thereof omitted;

FIG. 2 is a perspective view showing only a pair of pads provided so as to sandwich a rotor and viewed from the upper right direction in FIG. 1;

FIG. 3 is a front view showing a second example of the embodiment of the present invention with a part thereof omitted.

FIG. 4 is a front view showing only a support.

FIG. 5 is a partial transverse sectional view showing a first example of a conventional structure.

FIG. 6 is a partial longitudinal sectional view of the same.

FIG. 7 is a diagram showing a first example of a conventional structure using a pressure distribution diagram of a pad pressing against a rotor.

FIG. 8 is a view similar to FIG. 7, showing a second example of the conventional structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Rotor 2, 2a, 2b, 2c Support 3, 3a, 3b Incoming side engaging part 4, 4a, 4b Outgoing side engaging part 5, 5a, 5a ', 5b Pad 6 Piston 7, 7' Lining 8, 8 'backing 9 rotation entrance side engaging groove 10 run-out side engaging groove 11 rotation entrance side projecting piece 12 times the delivery side projecting piece 13 cylinder 20 caliper 21 cylinder part 22 caliper claw 23 mounting hole O ₁ the center axis of the pad O ₂ Center axis of piston e Deflection of center axes O ₁ and O ₂

Claims (2)

[Claims] 1. A support fixed to a vehicle body across a rotor that rotates with wheels, and a pair of a reciprocating side end of the rotor and a revolving side end of the rotor at positions sandwiching the rotor of the support. Each end of each of the inflow-side engagement portion and the outflow-side engagement portion, and both the inward-side and outflow-side engagement portions is slidably engaged with the rotor in the axial direction. Let one
A disc brake that includes a pair of pads, a caliper attached to the support, and a piston built into the caliper, and which, when the piston is pushed out, clamps the rotor by the pair of pads to perform braking. And
The center of pressure of the piston is set to a substantially central position of the length of the support with respect to the circumferential direction of the rotor, and the lining of each pad is also moved with respect to the back metal of each pad. A disc brake characterized in that the center of the lining is shifted toward the reciprocating side of the rotor with respect to the pressing center of the piston by shifting the center of the lining in the circumferential direction toward the reciprocating side of the rotor. 2. A support fixed to a vehicle body over a rotor that rotates with wheels, and a pair of a reciprocating side end and a revolving side end of the rotor at positions sandwiching the rotor of the support. Each end of each of the inflow-side engagement portion and the outflow-side engagement portion, and both the inward-side and outflow-side engagement portions is slidably engaged with the rotor in the axial direction. In this state, a pair of pads provided at a position sandwiching the rotor, a caliper attached to the support, and a piston built in the caliper are provided.
In a disc brake in which braking is performed by sandwiching the rotor between the pair of pads, the center of pressing of the piston is set to a substantially central position of the length of the support in the circumferential direction of the rotor. The interval between the engagement portions on the inflow side and the outflow side in the circumferential direction of the rotor is set to be smaller than a dimension capable of supporting the respective pads at the time of casting of the support, and the lining of the respective pads is formed. The inflow side and outflow side engaging portions are machined so that the center is shifted toward the inflow side of the rotor from the center in the longitudinal direction of the support, and the inflow side engagement portion is engaged with the outflow side engaging portion. Sharpen more than the joints and adjust the distance between the inflow side and the outflow side both engaging parts to a size that can support each pad, and set the center of the lining constituting each pad to the pressing center of the piston. In contrast, Disc brake, characterized in that was shifted to the times the entry side of the data.