JPS6023559Y2 - Caliper floating type disc brake pad retainer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a pad retainer in a caliper floating type disc brake that has the function of pressing a brake pad toward a torque member with an appropriate force.

One of the disc brakes for vehicles has a pair of brake pads arranged on both sides of a rotating disc rotor, which are held movably in parallel with the axis of the disc rotor by a torque member attached to a fixed position. There is a caliper floating type disc brake that is pressed against both sides of a disc rotor by a caliper.

In this type of disc brake, the brake pads are usually supported at both shoulders by torque members.
In order to prevent the brake pad from lifting off from the torque member when vibration is applied to the brake or excessive torque is applied to the brake pad, a cross-shaped pad retainer made of an elastic plate is installed. It is.

This pad retainer has protrusions protruding from the inward surfaces of the pair of arms, that is, the radially inward surfaces from the outer circumferential side of the disc rotor toward the shaft center, in contact with the shoulders of the brake pad, and the flat plate. The outward facing surfaces near the tips of the head and leg portions, that is, the radially outward facing surfaces of the disc rotor, are the inward facing surface of the connecting portion that connects the cylinder portion and pawl portion of the caliper, and the inner surface of the torque member. It is placed in contact with the facing surface.

However, in this case, if a manufacturing error occurs in any of the three members mentioned above and the relative positional relationship between the brake pad shoulder and the caliper connecting part or the pad support surface changes, the head and leg parts and the caliper connecting part and the torque The state of contact with the member also changes accordingly.

This is because conventionally, the head and leg portions of the pad retainer were formed into a flat plate shape and were in surface contact with the caliper connecting portion and the torque member.

As a result, even if the dimensions and shape of the pad retainer itself are normal, variations in the force with which the brake pad is pressed against the torque member become large.

If the pressing force is too small, the brake pads will lift up; on the other hand, if the pressing force is too large, so-called brake dragging will occur.

Against this background, the present invention was developed with the object of providing a pad retainer in which the pressing force does not change much even when manufacturing errors occur in each of the above-mentioned members.

Another purpose of the present invention is to always reduce the pressing force of the pad retainer to prevent the brake pad from dragging.
The purpose is to rapidly increase the pressing force when an unexpected lifting force acts on the brake pad due to brake vibration or the like.

Therefore, the gist of the present invention is that in the pad retainer having the above-mentioned shape, protrusions are formed on the inward facing surfaces of the pair of arms, and protrusions are formed on the outward facing surfaces near the tip edges of the head and the legs. The brake pad is formed on the outward facing surface of at least one of the intermediate portions of the head portion and the leg portion, respectively, and is lifted from the torque member by more than a certain amount in the radial direction of the disc rotor. The third protrusion is formed to contact the connecting portion or the torque member only when the third protrusion is in contact with the connecting portion or the torque member.

In this way, the pad retainer will be brought into contact with the coupling part and the torque member intensively at the first and second protrusions, and the contact position will not change even if there are manufacturing errors in the caliper, torque member, etc. Also, the pressing force of the pad retainer does not change.

Therefore, the brake pad is pressed against the support surface of the torque member with a relatively small pressing force that does not change, thereby preventing the brake pad from dragging.

Moreover, when the brake pad lifts up by more than a certain amount, the third protrusion comes into contact with the connecting part or the torque member, and the spring constant of the pad retainer increases rapidly, acting as a lifting prevention plate.

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to further clarify the purpose, structure, and effects of the present invention, embodiments thereof will be described in detail below with reference to the drawings.

In FIGS. 1 and 2, 10 is a disk that rotates integrally with a wheel (not shown), and is provided with friction surfaces 11 and 12 perpendicular to the axis on both sides of its outer periphery.

A torque receiving member 20 is disposed in a fixed position near the disk 10.

This torque receiver includes flat plate portions 21 and 22 arranged parallel to the friction surfaces 11 and 12 on both sides of the disk 10, and a pair of connecting portions (torque receivers) that extend beyond the outer periphery of the disk rotor 10 and connect the two. Part) 23L and 23R
The flat plate portion 21 is fixed to a non-rotating member (not shown) such as an axle tube.

The torque receiver has a large opening formed in the center of the member 20 from the flat plate part 21 to the flat plate part 22 via the torque receiver members 23L and 23R, and inside this opening are the inner pad 30, the outer pad 40, and the caliper. 50 are accommodated.

As is clear from FIG. 2, the inner pad 30 includes a back plate 31 having a substantially rectangular plate shape with the left and right lower corners cut out into triangular shapes, and a back plate 31 having a shape similar to the back plate and fixed thereto. It consists of a friction material 32.

And protrusions 33L and 3 protruding from both shoulders of the back plate 31.
3R is the pad support surface 26 formed inside the flat plate portion 21.
In the state supported by L and 26R, cutout 27 of the flat plate part
The disc rotor 10 is fitted into the disc rotor 10 so as to be able to slide into and away from the disc rotor 10.

The outer pad 40 has the same structure as the inner pad 30, and is housed and held in a notch formed in the flat plate portion 22 of the torque member in exactly the same manner as the inner pad.

Further, the caliper 50 includes a cylinder portion 51 provided facing the back surface of the inner pad 30, a bifurcated reaction portion 52 facing the back surface of the outer pad 40, and a connecting portion beyond the outer peripheral edge of the disc 10. Connecting portion 53
It consists of.

Boots 58L and 58 are erected on the flat plate portion 21.
A pair of slide pins 56L and 5 protected by R
The torque receiver is attached to the member 20 so as to be able to move in the axial direction of the disk 10 while being guided by the guide holes (not shown) formed in the arms 57L and 57R.

Further, a piston 59 is slidably fitted to the cylinder portion 51.

Between the torque member 20 and the caliper 50, the protrusions 33L and 33R of the brake pad 30 are connected to the pad support surface 26.
Pad retainers 60L and 60R are attached that act to press toward L and 26R.

Of these, the left pad retainer 60L in FIGS. 1 and 2 has a pair of arm portions 61 and 6, as shown in FIG.
2. It consists of a head 63 and legs 64, and has an approximately cross shape as a whole.

It is formed by punching a steel plate into a predetermined shape using a press, and then bending or embossing it at a predetermined position.

The middle portions of the arms 61 and 62 in the width direction are curved in a semicircular shape that protrudes downward in FIG. 4, that is, inward in the radial direction of the disc rotor 10. Projections 66 and 67 on the surface
is formed.

The head 63 is curved to be convex downward from the middle part to the tip, and the tip is curved upward, that is, to be convex outward in the radial direction of the disc rotor 10. That is, a relatively long protrusion (protrusion) 69 is formed on the radially outward surface.

Further, a protrusion 71 for preventing falling off is made to protrude upward near the arm part.

The leg portion 6 is narrower in width than the head portion 63 but has a longer protrusion (amount of protrusion).
4 is similarly curved convexly downward from the middle part to the tip part, and a second protrusion 73 is formed on the upper surface of the tip part, but the middle part is further made to protrude upward and has a third protrusion. Article 74
is formed.

Also, on both sides near the tip are tabs 76 for retaining the retainer.
is inclined and protrudes so that its free end is close to the axis of the disc rotor 10.

The pad retainer 60L is attached to the flat plate portion 2 as shown in FIG.
1 and 22 and the torque receiving portion 23L.
The ear piece 76 is brought into elastic contact with the wall surface 17 and the second protrusion 73 is brought into contact with the ceiling surface 18 in a state in which most of the ear piece 76 is inserted.

In addition, in FIG.
and 67 are protrusions 33L of the inner pad back plate 31, respectively.
and the protrusion 43L of the outer pad back plate 41 from above, while the first protrusion 69 of the head 63 contacts the lower surface 54 of the caliper connecting portion 53.

At this time, the arms 61 and 62, the legs 64, and the head 63
Each side is a caliper connecting part 53 and a torque receiving part 23L.
It is not in contact with any side of the

Furthermore, as shown in FIG.
It is located in a position where it touches, but normally it does not.

In addition, the protrusion 71 is designed to prevent the pad retainer 60L from colliding with the ear piece 76.
When it is pulled out from the space 16 against the locking force of
This is to prevent the pad retainer 60L from falling off by coming into contact with the caliper connecting portion 53, and normally does not come into contact with the caliper connecting portion 53.

The above situation is exactly the same for the right pad retainer 60R in FIGS. 1 and 2.

In the installation state shown in FIGS. 1 to 3, the head 6
3 and the leg portion 64 are both elastically deformed slightly downward from their natural state, and an appropriate pressing force is applied to the shoulder portion of the brake pad through the arm portions 61 and 62.

This pressing force is applied to the brake pads 30 and 40 and the caliper 5.
0 or the torque member 20, the relative positional relationship between the protrusions 33L and 43L of the brake pad back plate and the caliper connecting portion 53 or the pad support surface 26L (especially in the thickness direction of the pad retainer 60L) Even if ) changes slightly, it is always kept at an approximately constant value.

This is because the head portion 63 and the leg portions 64 are brought into intensive (line contact) contact with the caliper connecting portion 53 and the torque receiving portion 23L at the first protrusion 69 and the second protrusion 73, respectively. .

When the brake vibrates and rattles (rudling) occurs in the brake pads 30 and 40, the third protrusion 74 comes into contact with the ceiling surface 18 of the space, as shown in FIG.

At this time, the protrusion 69 of the head 63 is still in contact with the caliper connecting portion 53.

However, since the distance between the protrusions 66 and 67 on the arms and the third protrusion 74 is much shorter than the distance between the protrusions 66 and 67 and the second protrusion 73, the third protrusion 74 After contacting the surface 18, the elastic deformability of the pad retainer 60L rapidly decreases.

In other words, the pressing force increases rapidly, and the pad retainer 60L comes to act as a floating prevention plate rather than a pressing plate.

A similar effect can also be obtained when a co-rotating torque acts on the brake pads 30 and 40 in the clockwise direction in FIG. 2 and the protrusions 33L and 43L sides are lifted.

In other words, as shown in FIG.
8, the pressing force W of the pad retainer 60L is almost proportional to the amount of deflection δ, and its proportionality constant (corresponding to the spring constant of a spring) changes before and after the above-mentioned contact. That's going to change a lot.

On the other hand, for example, as shown in FIG.
60, these and the caliper connection part 53 are used.
The contact position of the torque receiver with the portion 23L is not constant, and the relationship between the amount of deflection δ and the pressing force W changes along a downwardly bulging curve as shown in FIG.

Therefore, as is clear from the comparison with Fig. 6, even if the variation in the amount of deflection during installation is almost the same amount δ1, there is a large difference in the variation in the pressing force as shown by W2 and W3, and there is a large difference in the variation in the pushing force as shown by W2 and W3. The probability of this occurring was also high.

In addition, the first to third protrusions 69.7 in the above embodiment
3 and 74, a short protrusion (protrusion 71
(see).

In this case, it is desirable that two or more protrusions be provided on both sides of the head and legs.

Further, the third protrusion can be formed on the head side or on both the legs and the head.

Particularly in the latter case, the elastic deformability after contact with the third protrusion is significantly reduced; however, in either case, the effects described above can be obtained.

[Brief explanation of drawings]

Fig. 1 is a front view showing the pad retainer according to the present invention attached to a caliper floating type disc brake, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a
Figure 4 is a perspective view of the pad retainer used in the embodiments shown in Figures 1 to 3;
The figure is an enlarged view of the main part for explaining the effect, and FIG. 6 is a graph showing the relationship between the amount of deflection and the pressing force. FIGS. 7 and 8 are a perspective view and a graph corresponding to FIGS. 4 and 6, respectively, showing a conventional example. 10: Disc rotor, 16: Space, 20: Torque member, 21, 22: Flat plate portion, 23L. 23R: Torque receiver is a member, 26L, 26R: Pad support surface, 30: Inner pad, 31: Back plate, 33L, 33R
: Projection, 40: Outer pad, 50: Caliper, 53:
Caliper connection part, 60L. 60R: Pad retainer, 61, 62: Arm, 63: Head, 64: Leg, 66.67: Projection, 69.73, 74
: Protrusion (long protrusion).

Claims (1)

[Claims for Utility Model Registration] A disc rotor, a pair of brake pads disposed on both sides of the disc rotor, and a cylinder section and a reaction member disposed opposite to each other on the back of each of the pair of brake pads. a caliper that presses the brake pad against the disc rotor by connecting the brake pads to the disc rotor in a direction parallel to the axis of the disc rotor; In a floating caliper disc brake including a movably held torque member, a substantially cross-shaped pad is provided to bias the brake pad in a direction toward the axis of the disc rotor in order to press the brake pad against the torque member. As a retainer, a pair of arms that are brought into contact with the shoulders of the brake pad radially inward from the outer circumferential side of the disc rotor toward the axial center thereof have inward facing surfaces substantially parallel to the axial center of the disc rotor. a protrusion formed on the torque member; a first protrusion formed on the outward surface near the tip edge of the head that is brought into contact with the coupling portion of the caliper from the axis side of the disc rotor; A second protrusion formed on an outward facing surface near the tip edge of the leg that is brought into contact from the axis side of the disc rotor, and at least one intermediate portion of the head and the leg that faces outward. The brake pad is formed in a radially outward direction of the disc rotor from the torque member, and is usually spaced apart from the coupling portion of the caliper and the torque member that faces the intermediate outward surface. A pad retainer for a caliper floating type disc brake, characterized in that the pad retainer includes a third protrusion that comes into contact with the opposing object when the pad retainer is lifted by more than a certain amount in the direction.