JPH0223868Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to improvements in disc brakes.

(Prior Art) Generally, a disc brake includes a carrier fixed to a non-rotating member of a vehicle on one side of the disc, a caliper held by the carrier so as to be able to straddle the outer periphery of the disc and to be freely displaceable in the axial direction of the disc.
It is equipped with a pair of friction pads arranged to sandwich the disk, and when one of the friction pads is pressed against one surface of the disk by a pressing mechanism provided on the caliper,
The caliper, which is displaced by this reaction force, presses the other friction pad against the other surface of the disk to perform a braking action.

Such disc brakes are equipped with pad springs to prevent vibrations of the friction pads, and these pad springs, as shown in Figure 5,
In order to lock onto the vertical inner wall 6 and the stepped portion 7 of the connecting portion 8 provided on the leg portion 2a of the carrier 2 and press the friction pad 4 against the disk 2, it is closely attached to the vertical inner wall 6 of the connecting portion 8 of the leg portion 2a. The base 11 has a bent portion 11c that contacts the stepped portion 7, and a pressing portion 12 extending from the upper end of the base 11. Moreover, the pad spring 5 is located at approximately the center of the base 11 so that the pad spring 5 does not come off from the disk 2. Retainer part 1 extending diagonally downward from
It has 4. The retaining portion 14 is in contact with a portion of the connecting portion 8 provided on the leg portion 2a of the disk 2 closest to the disk outer periphery, that is, a cutout inner wall surface of the connecting portion 8 along the circumferential direction of the disk outer periphery 1.

(Problem to be solved by the invention) However, since the retaining part of this pad spring is located closest to the outer periphery of the disk and the connecting part of the carrier, the disc, connecting part, and retaining part are mutually connected. dimensional tolerances had to be strictly controlled.

Furthermore, it is necessary to provide a fairly wide distance between the retaining portion and the outer periphery of the disk so that they do not interfere with each other due to rotation of the disk or external vibrations.

Therefore, even if a notch is provided in a portion of the connecting portion on the upper part of the carrier close to the disk outer periphery to widen the gap between the disc and the disk, the retaining portion is located at the portion closest to the disk outer periphery and the connecting portion. Therefore, the retaining portion becomes an obstacle to increasing the outer diameter of the disk. Moreover, since the retaining part of this pad spring is secured to the carrier using elastic force, it is more prone to dimensional errors than other fixing members, and is also affected by external vibrations. A new problem has arisen in that an additional gap is required between the disk and the retaining portion, and it is difficult to narrow the distance between the disk outer periphery and the connecting portion.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention is designed to prevent the pad spring from coming off even if the distance between the disk outer periphery and the connecting portion of the carrier that is close to the disk outer periphery is narrowed. To provide a disc brake in which the part of the friction pad is not interfered with by the disc and more effectively prevents rattling of a friction pad. Its composition is
fixed to a non-rotating member of the vehicle on one side of the disk;
a carrier having legs spaced apart in a circumferential direction of the disk and a connecting portion extending from the legs to straddle the outer periphery of the disk; supported by both legs of the carrier so as to be slidable in the axial direction of the disk; A pair of friction pads placed between the disks,
a caliper that is held movably displaceably in the axial direction of the disk at the connecting portion of the carrier and presses the friction pad; A retaining portion formed by the above-mentioned disc locks on an inner wall surface of the notch of the connecting portion along the circumferential direction of the outer periphery of the disk, and a pressing portion formed by folding back from the upper end of the base presses the pair of friction pads. In the disc brake configured with a pad spring, the surface of the notch inner wall surface that locks the retaining portion of the pad spring is an inclined surface located further radially outward of the disc than the notch inner wall surface. It is characterized by the following.

(Function) With this configuration, the pad spring is
Its base is brought into close contact with the vertical inner wall of the connecting portion 8 of the carrier leg, and the friction pad is pressed against the carrier with an appropriate biasing force. In addition, the retaining portion of the pad spring is located on an inclined surface provided further outside in the radial direction of the disk than the notch inner wall surface of the connecting portion along the circumferential direction of the disk. As a result, the retaining part of the pad spring is not disposed on the part of the connecting part closest to the disc that regulates the limit of the disc outer diameter, that is, on the inner wall surface of the notch. It becomes possible to narrow the gap with the outer periphery of the disk as much as possible.

Therefore, the outer diameter of the disc can be maximized within a disc brake of a predetermined size, increasing the braking force of the disc brake, increasing the heat capacity of the disc, and improving the cooling capacity.

(Example) Embodiments of the present invention will be described based on the drawings.

As shown in FIGS. 1 to 3, the disc brake of the present invention includes a disc 1 that rotates with the movement of the vehicle, and a non-rotating member (not shown) of the vehicle.
a carrier 2 fixed to the carrier 2; a caliper 3 supported by the carrier 2 and displaced in the axial direction of the disk 1; a pair of friction pads 4, 4 arranged to sandwich the disk; Padded 4
It is generally composed of pad springs 5, 5 that suppress vibrations. 1 and 3 used for explanation here have a symmetrical structure, so only the left half is shown.

The carrier 2 has legs 2a, 2a spaced apart in the circumferential direction of the disk 1. The legs 2a, 2a have inner walls 6, 6 facing each other in the circumferential direction of the disk 1, step portions 7, 7, a connecting portion 8 extending in the axial direction of the disk 1 and located at the upper end of the carrier 2, 8. A pair of friction pads 4, 5 are attached to the stepped portions 7, 7 via pad springs 5, 5 attached to the insides of the respective leg portions 2a, 2a.
4 is slidably supported by sandwiching the disk 1. A bore 9,9 is bored in each connecting portion 8,8. One end side of the caliper support pins 10, 10 is slidably fitted into each of the bores 9, 9, and the carrier 3 is fixed to the other end side of each of the caliper support pins 10, 10. This caliper 3 has a pressing mechanism (not shown) inside, and a bridge portion 3a that straddles a pair of friction pads 4, 4 and the disk 1.
and leg portions 3b, and the pressing mechanism presses one of the friction pads 4 against one side of the disk 1, and the caliper 3, which is displaced by this reaction force, pushes the other friction pad 4 toward the other side of the disk 1. Braking force is applied by pressing against the

The pad spring 5 is, as shown in FIG.
A U-shaped plate-like body including a base portion 11, a pressing portion 12,
It consists of a regulating part 13 and a retaining part 14. The base 11 includes a pair of legs 11a, 11a, a bridge part 11b that connects the legs 11a, 11a at their upper ends, and bent parts 11c, 11c where the lower ends of the pair of legs 11a, 11a are bent. has
A pair of leg parts 11a, 11a and a bridge part 11b
is in contact with the inner wall 6 of the carrier 2, and each bent portion 11
c and 11c are brought into contact with the stepped portion 7.

At this time, the bridge portion 11b straddles the disk 1, and the pair of leg portions 11a, 11a and each bent portion 11c, 11c have claw portions 11d, 11d, 11 at the ends in the axial direction of the disk 1, respectively.
e, 11e are formed, and each claw part 11d, 1
The base 11 is positioned relative to the carrier 2 by 1d, 11e, 11e.

The pressing part 12 is an elongated member with a substantially semicircular cross section,
The friction pads 4, 4 placed on each bent portion 11c, 11c are pressed from above. As a result, the friction pad 4 is indirectly supported by the carrier 2 in a slidable manner.

The regulating part 13 extends from the upper end of the base 11 and presses the pressing part 1.
The pad spring 5 is located in the displacement region 2 to prevent the pressing portion 12 of the pad spring 5 from being lifted beyond the limit.

The retaining portion 14 extends obliquely downward from the lower end of the bridge portion 11b constituting the base 11 on the opposite side to the bending direction of the bent portions 11c, 11c. , 11c are in contact with the stepped portion 4, so that they are elastically engaged with the side surface of the connecting portion 8. Therefore, the pad spring 5 will not come off upward.

In the present invention, a notch 15 is provided in a portion close to the outer periphery of the disk 1 diagonally below the connecting portion 8 facing the disk path portion 16 through which the disk 1 passes.
The distance between the disk 1 and the connecting portion 8 is maintained. This notch 15 is formed so that the retaining part 14 is aligned with the inclination angle of the notch inner wall surface 15a facing the disk path part 16 separated by a minimum distance A from the disc 1 and the retaining part 14.
The inclined surface 15b is located on the outer side in the radial direction of the disk 1 than the surface of the connecting portion 8 facing the disk path portion 16, that is, the notch inner wall surface 15a. vertical inner wall 6
The notch inner wall surface 15a is formed as a surface for locking the retaining portion 14 of the pad spring 5.

Therefore, the retaining portion 14 is located above the approximate center of the base portion 11 of the pad spring 5, and is kept at a considerable distance from the disk 1.

The operation of the disc brake configured as described above will be explained.

Caliper 3 is used to stop the operation of disk 1.
A braking force is generated by pressing one of the friction pads 4 against one surface of the disc 1 by a pressing mechanism built into the pad, and by pressing the other friction pad 4 against the other surface of the disc 1 by the caliper 3, which is displaced by this reaction force. works and stops disk 1. Through this repeated operation, the friction pad 4 slides into contact with and away from the disk 1. At this time, the pad spring 5 holds the friction pad 4 with an appropriate biasing force to prevent the friction pad from rattling.

Moreover, the distance between the disk 1 and the retaining portion 14 of the pad spring 5 is made larger than the closest minimum distance A between the disk 1 and the connecting portion 8,
It is locked to a surface that slopes outward in the disk radial direction from the surface facing the disk path portion 16.

Therefore, if the retaining part 14 is located away from the disk 1, it will not be affected by the braking force applied to the friction pad 4 when the disk 1 is stopped, external shocks, or dimensional errors between the component parts. figure,
There will be no interference with the disk.

In addition, by providing the retaining portion 14 as far as possible above the center of the base 11 of the pad spring 5, the "wobble" of the pad spring 5 can be prevented.
The friction pad 4, which is sandwiched between the base 11 having the bent portion 11c and the pressing portion 12, is held in close contact with the vertical inner wall 6 of the connecting portion 8 of the leg portion 2a by reducing the friction pad 4. Reliably held.

Further, elastic force acts on the retaining portion 14 that extends diagonally downward and locks onto the inclined surface 15b, and acts to prevent the pad from slipping out upward. Therefore, the reaction force F of the elastic force acting on the inclined surface 15b acts on the carrier 2 with a force that presses the friction pad 4 downward.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, but also includes the following embodiments.

That is, the coupling part is provided with an inclined surface on which the retaining part 14 of the butt spring 5 is effectively locked at a position outward in the disk radial direction in the coupling part 8 that is at least the closest distance between the outer periphery of the disk 1 and the coupling part 8. Good to have. Therefore, the inclined surface can be either straight or curved.

(Effects) As is clear from the above, the present invention has the following effects:
The necessary spacing is maintained between the outer circumference of the disk and the connecting part, and the retaining part of the pad spring is located at a position where it does not interfere with the movement of the disc, so that the appropriate biasing force from the pad spring is always applied. It can be applied to the friction pad to prevent the friction pad from rattling.

Further, since the retaining portion is not located at the closest portion between the outer periphery of the disk and the connecting portion, the outer diameter of the disk can be made as large as possible within a disk brake of a predetermined size. Therefore, by increasing the outer diameter of the disk, the braking force of the disk brake increases and the heat capacity of the disk also increases, which improves the cooling capacity and improves the characteristics of the disk brake. In addition, since the retaining part of the pad spring is located above the base, the reaction force due to the elastic force acting on the engagement surface of the connecting part increases the force that presses the entire friction pad downward against the carrier. This is advantageous in preventing rattling. Furthermore, as an effect of the embodiment, if the slope of the retaining portion is made steeper than the inner wall surface of the notch, the angle α between the retaining portion and the base of the pad spring becomes smaller. This makes it easy to bend the retaining portion, and the repetitive load applied to the retaining portion of the engagement surface due to external impact is alleviated, so that the retaining portion is less likely to sag. In addition, since the inclination angle α is small, the strength of the material at the bent portion can be maintained, resulting in a long service life.

[Brief explanation of the drawing]

Fig. 1 is a partially enlarged sectional view showing an embodiment of the present invention, Fig. 2 is a plan view of the invention, Fig. 3 is a front view of Fig. 2, and Fig. 4 is an enlarged perspective view of the pad spring. FIG. 5 is a sectional view showing a conventional example seen in the same manner as FIG. 1. 1... Disc, 2... Carrier, 2a... Leg, 3
... Caliper, 4... Friction pad, 5... Pad spring, 6... Vertical inner wall, 7... Step part, 8... Connecting part, 1
1... Base, 12... Pressing part, 14... Retaining part, 1
5... Notch portion, 15a... Notch inner wall surface, 15b... Inclined surface, 16... Disk path portion.

Claims (1)

[Claims for Utility Model Registration] (1) Legs fixed to a non-rotating member of the vehicle on one side of the disc and spaced apart in the circumferential direction of the disc, and a connection extending from the legs across the outer periphery of the disc. a pair of friction pads that are supported by both legs of the carrier so as to be slidable in the axial direction of the disk and are disposed with the disk between them; a caliper that is movably held and presses the friction pad; a base portion of which is in close contact with a vertical inner wall of a connecting portion of the carrier; and a retaining portion formed by bending outward from the base portion that is attached to the outer periphery of the disk; A pad spring configured to engage with the notch inner wall surface of the connecting portion along the circumferential direction of the pad spring and configured such that a pressing portion connected to the base portion presses the pair of friction pads, the disc brake comprising: The surface of the inner wall surface of the notch that locks the retaining portion of the pad spring is an inclined surface located further outward in the radial direction of the disk than the inner wall surface of the notch. (2) The disc brake according to claim 1, wherein the inclined surface has a steeper angle of inclination than the inner wall surface of the notch.