JP2506773B2 - Disc brake friction pad support mechanism - Google Patents

Description

Description: FIELD OF APPLICATION OF THE INVENTION The present invention relates to a friction pad support mechanism in a disc brake.

BACKGROUND OF THE INVENTION FIG. 6 shows a friction pad support mechanism in a conventional disc brake.

This disc brake is a floating caliper type, 1 is a pad support attached to the vehicle body,
Reference numeral 2 indicates a caliper body, and 3 indicates a friction pad.
The pad support 1 has openings 4 and 5 for arranging the friction pads 3 in the inner support portion 1a and the outer support portion 1b inside and outside with a rotor (not shown) in between.

When the rotor is rotating in the direction of arrow A, the friction pad 3 has the engaging projections 6a, 6b projecting from the front end edge thereof which abut on the concave grooves 4a, 5a (4a not shown) of the pad support 1. hand,
The brake tangential force from the friction pads 3, 3 is all applied to the concave grooves 4a, 5a side of the pad support 1 (hereinafter referred to as the rotor feeding side).

By the way, in such a friction pad support mechanism, as shown in FIG. 7 (a), the brake tangential force from the rotor is supported only by the rotor advancing side end face (R ₁ ) and the couple is supported by the rotor. Since it is supported by the inflow side (R ₃ ) and the rotor outflow side (R ₂ ), when sliding the friction pad 3 in the rotor axial direction, as shown in FIG. The sliding resistance (f ₁ ) of the rotor also increases the sliding resistance (f ₂ ) on the rotor entry side, so that the rotor entry side of the friction pad 3 is strongly pressed against the rotor, and the friction pad 3 There was a tendency that the surface pressure of the friction material 7 became non-uniform and uneven wear occurred.

Further, as shown in FIG. 8, the friction pad 10 has a substantially fan shape.
In a friction pad support mechanism in which the rotor entry side member 11 and the rotor exit side member 12 are integrally supported by the pad support 14 at the bridge portion 13, as shown in FIG. In addition, since the brake tangential force from the rotor is supported by R ₁ .R ₂ and the couple force is supported by R ₂ .R ₃ , R ₁ + R ₃ > R ₂ holds, and when sliding the friction pad 10 in the rotor axial direction, , The sliding resistance (f ₁ + f ₃ ) on the rotor entry side becomes higher than the sliding resistance (f ₂ ) on the rotor entry side, so that the rotor entry side of friction pad 10 presses strongly against the rotor. As a result, the surface pressure of the friction material of the friction pad 10 becomes non-uniform and uneven wear tends to occur.

[Object of the Invention] The present invention has been made in order to solve such a conventional problem, and makes the sliding resistances of the rotor entry side and the rotor exit side of the friction pad substantially equal during braking. An object of the present invention is to provide a friction pad support mechanism for a disc brake, which can prevent uneven wear of the friction pad by supporting the friction pad as described above.

[Summary of the Invention] The gist for achieving the object of the present invention is as follows.
In a floating caliper type disc brake, a flat surface formed by engaging engaging step portions for brake torque transmission facing each other at both ends in the disc rotor circumferential direction at the inner end in the disc rotor radial direction where the disc rotor is pinched by the caliper or piston. A pair of substantially fan-shaped friction pads, and an inner side that supports the pair of friction pads slidably in the axial direction of the disc rotor on the inner side and the outer side of the disc rotor and receives brake torque from the friction pads. A pad support member fixed to the vehicle body having a support portion and an outer side support portion, wherein the inner side support portion is provided with a pair of first and second engaging portions which receive the brake torque by engaging with the engaging step portions of the friction pad. The first and third engaging portions and both end portions of the friction pad in the rotor circumferential direction are engaged with each other and the brake torque is increased. The receiving and a pair of regulating the movement of the friction pad towards radially outside of the disk rotor 2
Engaging portion and a fourth engaging portion are formed, and the outer side supporting portion is a first engaging portion and a second engaging portion that support one end side in the circumferential direction of the disc rotor of the wear pad. And a supporting portion integrally having a third engaging portion and a fourth engaging portion for supporting the other end side in the circumferential direction of the disk rotor, The friction pad support mechanism of the disc brake is characterized in that the friction pad support mechanism is formed so as to be spaced apart and opposed to each other.

Embodiments of the Invention The present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 1 is a side view of a disc brake capable of effectively implementing the present invention as seen from the outer side, and FIG. 2 is a plan view thereof.

In the figure, 20 is an inner bridge portion of the pad support formed in a U-shaped cross section so as to straddle the disc rotor DR,
Reference numeral 21 denotes the outer bridge portion, and the pad support is screwed to the vehicle through the holes 20a, 20a provided at both ends of the inner bridge portion 20. 22 is a caliper body, 23
Shows a piston for pressing the friction pad provided on the caliper body 22. 24 is a friction member on the surface of the back metal 25
26 shows the fixed friction pad.

The back metal 25 of the friction pad 24 is formed in a substantially symmetrical plane-shaped fan shape, and engaging step portions 27 and 28 are formed facing each other at both ends in the disk rotor radial direction and the disk rotor circumferential direction, Both shoulders 29, 30 are formed substantially at right angles.

The inner bridge portion 20 of the pad support is engaged with the engaging step portions 27, 28 and both shoulder portions 29, 30 of the inner side friction pad 24 so that the inner side friction pad 24 can slide in the axial direction of the rotor DR. An opening (not shown) held by the inner side friction pad 24 is formed so as to substantially match the outer shape of the inner side friction pad 24. The outer bridge portion 21 of the pad support that slidably supports the outer friction pad 24 along the axial direction of the rotor DR.
Is a rotor entry side support portion 31 that supports the rotor entry side end portion of the outer side friction pad 24, and the outer side friction pad 24.
And a rotor feed-out side support portion 32 for supporting the rotor feed-out side end portion of the rotor are formed along the circumferential direction (circumferential direction of the disc rotor) so as to be separated from each other. The rotor entry side support portion 31 of the outer bridge portion 21 of the pad support is the outer side wear pad.
First engaging portion with which engaging step portion 27 and shoulder portion 29 of 24 are engaged, respectively
31a, a second engaging portion 31b, and a rotor spill-side support portion 32
Is the engagement step portion 28 and the shoulder portion 30 of the outer side friction pad 24.
Has a third engaging portion 32a and a fourth engaging portion 32b which are engaged with each other.

That is, as shown in FIG. 3, the outer bridge portion 21 of the padd support is supported at both ends by the outer friction pad 24, the rotor entry side support portion 31, and the rotor exit side support portion 32, and the brake during braking is applied. The tangential force and the couple are supported, and when braking is performed with the rotor DR rotating in the direction of arrow A, the torque of the rotor DR causes the outer side friction pad 24 of the rotor entry side support portion 31 to move. The first engaging portion 31a, the second engaging portion 31b, and the fourth engaging portion 32b of the feed-out side supporting portion 32 are supported by the reaction forces of R ₁ , R ₃ , and R ₂ , respectively. The friction pad support angle (β) at the fourth engagement portion 32b of the feed side support portion 32 is equal to the friction angle (tan ⁻¹ μm) of the contact surface between the rotor feed side support portion 32 and the outer side friction pad 24. )
It is formed as described above.

At this time, when the deformation amount in the circumferential direction of the feed-in side support portion 31 becomes larger than the deformation amount in the circumferential direction of the feed-out side support portion 32, the feed-in side support portion 31 and the feed-out side support portion 32 are separated from each other. The facing distance is shortened,
Outer side friction pad 24 Shoulder part 30 on rotor end face side
Tries to move outward in the radial direction while being in contact with the fourth engaging portion 32b, and a frictional resistance force μR ₂ is generated there.

Therefore, in the fourth engagement portion 32b, the horizontal (disc tangential direction) component of (R ₂ + μR ₂ ) increases, the vertical component decreases, and the moment balance of the outer side friction pad 24 changes, First engaging portion of the inflow side support portion 31
The respective reaction forces R ₁ and R _{3 of} 31a and the second engagement portion 31b decrease.

Therefore, the outer bridge portion 21 of the pad support
Is a structure for supporting the outer side friction pad 24 at both ends by the turning-in side supporting portion 31 and the feeding-side supporting portion 32 facing each other.
Since it is possible to change the moment balance of the outer side friction pad 24 during braking, the first to fourth engaging portions 31a, 31 supporting the outer side friction pad 24 are provided.
Depending on the position of b, 32a, 31b and the pad support angle, the reaction force R ₁ ,
The sizes of R ₂ and R ₃ can be changed, and as shown in FIG. 4, around the 0 point (the pressing center of the pad pressing piston 22) due to the sliding resistance of the outer side friction pad 24 in the rotor axial direction. It becomes possible to balance the moments of, and it is possible to make the rotor entrance side sliding resistance and the rotor exit side sliding resistance of the outer side friction pad 24 substantially equal.

Therefore, since the friction member 26 of the outer side friction pad 24 is pressed against the rotor DR with a substantially uniform surface pressure, it is possible to prevent uneven wear of not only the outer side friction pad but also the inner side friction pad friction member. It is also possible to prevent the noise phenomenon of the pad.

Further, since the outer bridge portion 21 of the pad support has a structure in which the feed-in side support portion 31 and the feed-out side support portion 32 are separated and opposed to each other, compared to the conventional pad support outer bridge portion shown in FIG. Since there is no bridge portion, the weight can be reduced and the layout can be further improved.

FIG. 5 is a diagram showing the results of inner-side and outer-side friction pad wear tests by the friction pad support mechanism according to the present invention and the conventional friction pad support mechanism shown in FIG.

In the _{figure, n 1, n 2, n} 3, n 4, n 5 denotes the number of braking, in the conventional example number of braking the rotor rotational outlet side of the friction member on the outer side friction pad are many wear with increasing In contrast,
It was confirmed by experiments that the present invention wears substantially uniformly, while the inner side friction pad undergoes extreme uneven wear in the conventional example, but does not occur in the present invention.

[Effects of the Invention] As described above, according to the present invention, it is possible to prevent uneven wear of the friction pad, and it is possible to obtain an effect that the friction is stable and the occurrence of a noise phenomenon or the like can be prevented. To be

[Brief description of drawings]

FIG. 1 is a side view of a disc brake which can effectively implement the present invention as seen from the outer side, FIG. 2 is a plan view, FIG. 3 is a reaction force distribution diagram of an outer side friction pad, and FIG. 4 is its sliding. FIG. 5 is a distribution diagram of resistance, FIG. 5 is a view comparing wear materials of a friction pad by the present invention and a conventional friction pad support mechanism, FIG. 6 is a side view of a conventional friction pad support mechanism, and FIG. 7 (a) is The reaction force distribution chart, Figure 7 (b) is the sliding resistance distribution chart,
FIG. 8 is a schematic view of another conventional friction pad supporting mechanism, and FIG.
FIG. 9A shows the reaction force distribution map, and FIG. 9B shows the sliding resistance distribution map. 20 …… Inner bridge part 21 …… Outer bridge part 22 …… Caliper body 23 …… Piston, 24 …… Friction pad 27,28 …… Engagement step, 29,30 …… Shoulder 31 …… Rotating Side support part 32 …… Rotor feed-out side support part 31a, 31b, 32a, 32b …… Engagement part

Claims (1)

(57) [Claims] 1. In a floating caliper type disc brake, engagement step portions for transmitting brake torque are opposed to each other at both ends in the disc rotor circumferential direction at the disc rotor radial inner end which is pressed against the disc rotor by a caliper or a piston. A pair of substantially fan-shaped friction pads formed together and a pair of friction pads slidably supported on the inner side and outer side of the disc rotor in the axial direction of the disc rotor, and a brake from the friction pads. A pad support member fixed to the vehicle body having an inner side support portion and an outer side support portion for receiving a torque, the inner side support portion being engaged with each engagement step portion of the friction pad to provide a brake torque And a pair of first and third engaging portions for receiving and engaging both end portions of the friction pad in the circumferential direction of the rotor. A pair of second engaging portion and fourth engaging portion for receiving the rake torque and for restricting the movement of the friction pad outward in the radial direction of the disc rotor are formed, and the outer side support portion is the friction pad. Supporting portion integrally having a first engaging portion and a second engaging portion for supporting one end portion side of the disk rotor in the circumferential direction, and a third engaging portion supporting the other end portion side of the disk rotor in the circumferential direction. A friction pad support mechanism for a disc brake, characterized in that a joint portion and a support portion integrally having a fourth engagement portion are formed so as to face each other in the circumferential direction of the disc rotor.