JPS6335854B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to improvements in disc brakes used for braking automobiles.

For example, as shown in FIG. 1, a disc brake has a support 2 that is provided to sandwich a rotor 1 that rotates together with the wheels, and a pair of pads 3 that sandwich the rotor 1 so that the rotor can freely slide in the axial direction. A caliper 4 is attached to the upper part of the support 2 so as to allow the rotor 1 to slide freely in the axial direction. When performing braking, when one pad 3 is pressed against the side surface of the rotor 1 by a piston provided on the caliper 4, the caliper 4 slides as a reaction, and the other pad 3 is pushed through the caliper pawls 4a, 4a. Braking is performed by pressing against the side surface of the rotor 1 and strongly pressing the rotor 1 from both sides with both pads 3,3.

In the disc brake constructed and operated as described above, each pad 3 has engaging portions 5, 5 protruding from both sides of the back metal of the pad 3 provided on both sides of the pad storage portion 6 of the support 2. It is supported by the support 2 by being slidably engaged with the grooves 6a, 6a, but since the pad 3 has a structure that can slide against the support 2, the engagement grooves 6a, 6a and the engagement portion There is inevitably a small gap between 5 and 5. Therefore, in order to prevent the pad 3 from rattling within the support 2 due to vibrations during driving, the support 2
An anti-rattle spring 7 is installed between the bottom surface of the pad housing section 6 and the bottom surface of the back metal of the pad 3 to press the engaging portion 5 against the top surface of the engaging groove 6a to prevent rattling. .

However, as mentioned above, support 2 for pad 3
Due to the structure of the brake pedal, which has an anti-rattle spring that loosely engages the brake pedal and prevents rattling, a noise called squeal is often generated when the brake pedal is lightly pressurized.

The mechanism of such noise generation can be considered as follows. That is, the conventional anti-rattle spring 7 is
As shown in Fig. 2, the lower surface of the pad 3 is pressed evenly on both sides of the center line a that divides the pad 3 into left and right sides, but when braking, the lining of the pad 3 rotates in the direction of arrow b. When the pad 3 comes into sliding contact with the side surface of the rotor 1, the pad 3 receives a frictional force in the direction tangential to the rotation of the rotor 1, and the left half of the pad 3 is pushed in the direction of arrow X, and the right half is pushed in the direction of arrow Y. pushed towards. Therefore, due to the vertical component forces x and y of each frictional force in the vertical direction in Figure 2, the side of the pad 3 opposite to the anchor (left side in the figure) is pushed upward (toward the outside of the rotor), and the side of the anchor pad 3 (on the right side in the figure) is pushed upward (towards the outside of the rotor). Pushed downward (inward of the rotor). During braking, there is strong friction between the side surface of the rotor 1 and the pad 3, and these component forces x and y are also large, so the anchor side of the pad 3 resists the pressing force of the anti-rattle spring 7, as shown by the chain line in Figure 2. It's like being pushed down.

However, in the non-braking state, the aforementioned component forces x and y are small or not present at all, so the pad 3
The anchor side of the pad 3 cannot be pushed down, and especially when the component force y that tries to push down the anchor side of the pad when applying light pressure as described above and the elasticity of the anti-rattle spring 7 are almost equal, the pad 3 becomes unstable. It oscillates and generates the above-mentioned noise called squeal.

The object of the present invention is to obtain a disc brake that prevents the generation of noise as described above, and when the rotor and pad come into contact, the engaging portion 5 on the anchor side immediately closes the engaging groove 6a. The disc brake is constructed so that it does not rattle when it comes into contact with the bottom surface of the machine.

Hereinafter, the present invention will be explained with reference to the drawings showing examples.

3 and 4 show an embodiment of the present invention, in which pad 3
This is an example in which the anchor side of the engagement groove 6a is configured to be positively pressed downwardly. The anti-rattle spring 12 used in this embodiment is constructed by folding inward one end of an elastic metal plate formed into a substantially U-shape as shown in FIG.
is formed. When installing such an anti-rattle spring 12 to a disc brake,
As shown in FIG. 4, the anti-rattle spring covers the entire inner peripheral surface of the engagement groove, and the elastic piece 12a covers the lower surface of the engagement portion 5 of the pad 3 on the side opposite to the anchor, and the upper surface on the anchor side. are fitted into the engagement grooves 6a of the support 2 so as to be pressed respectively. Because of this configuration, the lining of pad 3 is
It contacts the side surface of the rotor 1 in the same state both during braking and non-braking, and noise generation is completely prevented.

Since the anti-rattle spring 12 is formed separately from the support and the pad back metal, a material different from these can be used. Therefore,
For example, use a rust-resistant material such as stainless steel or phosphor bronze to cover the entire inner circumference of the engagement groove to prevent the inner circumference of the engagement groove from rusting and making sliding with the engagement part uneven. can be prevented.

Further, in the embodiment shown in FIGS. 3 and 4, tongue pieces 12b, 12b are formed on the side edges of the anti-rattle spring 12, and the spring 12 is connected to the engagement groove of the support 2.
Since the edges of the engagement groove are elastically held by the tongue pieces 12b, 12b when attached to a,
The anti-rattle spring is fixed in the engagement groove 6a, and it is possible to prevent the anti-rattle spring from falling off the support during brake assembly, thereby preventing smooth assembly work. In this embodiment, the engagement groove 6a is formed in the support, but the same applies to the case where the anti-rattle spring is attached to the engagement groove formed in the pad back metal and a locking portion is formed in the support. Alternatively, the anti-rattle spring can be attached to the engagement groove by welding, riveting, or adhesive.

As described above, the disc brake of the present invention prevents the pads from shaking and making noise when lightly pressurized, and also prevents the engaging part from sliding in the engaging groove due to rusting on the inner circumference of the engaging groove. This is effective because it prevents the movement from becoming unsmooth.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an example of a disc brake, Fig. 2 is a schematic front view illustrating the force applied to the pad during braking, Figs. 3 and 4 show embodiments of the present invention, and Fig. 3 is an anti-braking Perspective view of rattle spring,
FIG. 4 is a front view showing the state of attachment to the disc brake. 1: Rotor, 2: Support, 3: Padded, 4:
Caliper, 9: Lining, 12: Anti-rattle spring.

Claims (1)

[Scope of Claims] 1. An engaging portion is protruded from one side of each of the back metals of the two pads 3, 3 which are slidably attached to the support 2 with the rotor 1 in between, and the support 2, and the engagement portion is protruded from the other side. An engagement groove for engaging the engagement portion is formed, and an anti-rattle spring 12 made of a bent elastic metal plate is attached to cover the entire inner peripheral surface of the engagement groove. A disc brake characterized by being mounted in such a way that the pad is pressed down and the pad is pushed up on the side opposite to the anchor. 2. The disc brake according to claim 1, in which the anti-rattle spring 12 is fixed to an engagement groove formed in one of the support 2 and the pad 3.