JPH0353073Y2 - - Google Patents

Description

[Detailed description of the invention] a. Purpose of the invention (field of industrial application) The floating caliper type disc brake according to this invention is used for braking automobiles; The purpose is to prevent pa-type disc brakes from generating harsh noises due to vibrations of calipers and other parts during braking.

(Prior Art) Disc brakes, which obtain braking force by pressing a pair of pads against both sides of a rotor that rotates together with the wheels, are widely used as brakes for automobiles.

There are various types of disc brakes for braking cars, but by pushing out a piston that has a pair of front and back pads facing each other on both sides of the rotor, only on one side of the rotor.
Floating caliper type disc brakes are widely used as disc brakes that can apply pressure evenly to both sides of the rotor.

As shown in Figures 1 to 3, this floating caliper type disc brake is located inside the rotor 1 that rotates with the wheels (inner side refers to the center of the vehicle body, which is the upper side in Figures 1 and 3). 1 for guiding the movement of the caliper 3 on the support 2 fixed to the vehicle body.
It is attached via a pair of pins 4 and 5, and is positioned opposite both the inner and outer surfaces of the rotor 1 by pushing out a piston 7 fitted in a cylinder 6 (Fig. 3) provided at the inner end of the caliper 3. A pair of pads 8a, 8
By pressing b on both sides of rotor 1, rotor 1
The wheels are braked through the

In order to support the caliper 3 on the support 2 so as to be movable in the direction of the rotation axis of the rotor 1, the tips of a pair of pins 4 and 5 whose base ends are fixed to the support 2 (upper ends in Figures 1 and 3) are shown. ) are slidably inserted into guide cylinder portions 9 and 10 formed on the caliper 3.

The anti-anchor side (referring to the rotation side of the rotor 1, when the rotor 1 rotates in the direction of arrow a in Fig. 1,
It is on the right side of the figure. ) A cylindrical sleeve 11 made of metal is provided between the inner circumferential surface of the guide tube portion 9 and the outer circumferential surface of the pin 4.
This ensures smooth sliding between the two. or,
Between the outer circumferential surface of a metal cylindrical sleeve 12 fitted onto the pin 5 on the anchor side (the rotation side of the rotor 1) and the inner circumferential surface of the guide cylinder section 10, an elastic material such as rubber is inserted into the cylindrical sleeve. An elastic bush 13 made in the shape of a shape is attached to the guide cylinder section 10 so that it can freely move in the direction of the central axis of the pin 5 and can be slightly displaced in a direction perpendicular to the central axis of the pin 5.

When braking is performed using the floating caliper type disc brake configured as described above, pressure oil is sent to the cylinder 6 provided at the inner end of the caliper 3, and the piston 7 installed in this cylinder 6 is applied.
is pushed out toward the rotor 1, which rotates together with the wheels.

As a result of this pushing of the piston 7, the inner pad 8a is first pressed against the inner surface of the rotor 1 rotating in the direction of the arrow a in FIGS. ，
10 and move inward (upward in FIGS. 1 and 3) while sliding them together.

As the caliper 3 moves inward in this manner, the pad 8b located on the outside of the rotor 1 moves into the caliper pawl 1 formed at the outer end of the caliper 3.
4 and 14, it is pressed against the outer end surface of the rotor 1. As a result, the rotor 1 rotating together with the wheels is strongly clamped from the inside and outside, and braking is performed.

During braking performed in this manner, the friction materials 15, 15 of the pair of inner and outer pads 8a, 8b strongly rub against the side surfaces of the rotor 1, so that each pad 8
A strong force is applied to the pads 8a and 8b to move the pads 8a and 8b toward the anchor, but this force is received by the anchor side portion of the support 2 that supports each pad 8a and 8b.

Also, part of the force that tries to move the inner pad 8a toward the anchor is due to the back metal 16 of this pad 8a.
Due to the friction between the back surface 16a of the pad 8b and the outer end surface of the piston 7, part of the force that tries to move the outer pad 8b toward the anchor is caused by the friction between the back surface 16a of the back metal 16 of this pad 8b and the inner surface 14a of the caliper claw 14. The friction is transmitted to the caliper 3 respectively.
Therefore, during braking, a force is applied to the caliper 3 to move it toward the anchor, and the caliper 3 is slightly displaced relative to the support 2 toward the rotation side of the rotor 1, but this displacement is not caused by the anchor. This is absorbed by elastic deformation of the elastic bushing 13 between the inner circumferential surface of the side guide cylinder portion 10 and the outer circumferential surface of the sleeve 12.

In addition, in the drawing, 17, 17 is support 2
In order to prevent the pads 8a, 8b supported by the pads 8a, 8b from rattling and generating noise when not braking, an anti-rattle spring made of a leaf spring is installed between the support 2 and the back metals 16, 16 of the pads 8a, 8b. , 18 is a shim plate interposed between the inner surface 14a of the caliper pawl 14 and the back surface 16a of the back metal 16 of the pad 8b.

(Problems to be Solved by the Invention) However, in the floating caliper type disc brake constructed and operated as described above, conventional problems have occurred as described below.

That is, when the caliper 3 is pulled in the direction of rotation based on the friction between the back surface 16a of the back metal 16 of the outer pad 8b and the inner surface 14a of the caliper pawl 14 during braking, the caliper 3 is pulled on the side opposite to the anchor. The fitting part between the pin 4 and the guide cylinder part 9 (X part in Fig. 3)
It tries to rotate clockwise in Fig. 3 around . In addition, in the case of a guide pin type disc brake having a structure as shown in FIGS. 1 to 3, the force transmitted to the caliper 3 due to the friction between the outer end surface of the piston 7 and the back surface 16a of the back metal 16 of the inner pad 8a is also transmitted to the caliper 3. involved in rotating.

If the force that tries to rotate the caliper 3 in the clockwise direction as shown in Figure 3 is always constant, the caliper 3 will not vibrate based on this force, but the uneven nature of the side surface of the rotor 1 , it is inevitable that the friction force acting between the side surface of the rotor 1 and the friction material 15 of the pad 8b will change minutely due to the occurrence of wobbling as the rotor 1 rotates, and therefore the caliper 3 It is also unavoidable that the magnitude of the force used to rotate the object changes minutely.

In this way, when the magnitude of the force that attempts to rotate the caliper 3 based on the rotation of the rotor 1 changes minutely during braking, the caliper 3 vibrates finely around the X portion, and this vibration causes a harsh sound. Noise will be generated. Inner surface 1 of caliper claw 14
The shim plate 18 interposed between the pad 4a and the back surface 16a of the back metal 16 of the pad 8b can somewhat reduce the vibration of the caliper 3 caused by the causes mentioned above, but it is not always sufficient when the conditions are severe. It is not possible to achieve a good noise prevention effect.

Furthermore, even if the force for rotating the caliper 3 does not change, as a result of the above-mentioned rotational force being applied to the caliper 3, the friction material 15 of the pad 8b located on the outside of the rotor 1 is pressed against the outer end surface of the rotor 1. It is unavoidable that the force applied to the pad 8b increases as it moves toward the anchor.
becomes unevenly worn. The friction material 15 of the inner pad 8a pushed by the piston 7 is the same as that of the outer pad 8b.
Although it is not so extreme, contrary to the outer pad 8b, the wear on the anti-anchor side is more advanced than on the anchor side. If the thickness of the friction material 15 of the pads 8a, 8b becomes uneven due to uneven wear, not only will this have an adverse effect on the original braking ability of the brake, but it will also cause noise during braking.

The floating caliper type disc brake of the present invention has pads 8b arranged on the outside of the rotor 1.
By reducing the magnitude of the force transmitted from the to the caliper pawl 14, the force that tries to rotate the caliper during braking is reduced, and the frequency of noise generation during braking is reduced.

b. Structure of the invention (means for solving the problem) The floating caliper type disc brake of the present invention, as shown in Figs. A caliper 3 is attached to a support 2 fixed in the vicinity of the rotor 1 which rotates together with the rotor 1 so as to be freely movable in the direction of the rotation axis of the rotor 1.

The support 2 supports a pair of pads 8a and 8b, which can be freely displaced in the direction of the rotational axis of the rotor 1. , 14 and the outer end surface of the piston 7 fitted in the cylinder 6 provided at the inner end of the caliper 3, by pressing against both sides of the rotor 1, a braking force is obtained. I'm doing it like that.

Furthermore, in the floating caliper type disc brake of the present invention, the caliper claws 14, 1
4 and the inner surfaces 14a, 14a of this caliper claw 1.
A coating made of a material having a low coefficient of friction is interposed between the inner surfaces 14a, 14a of the pads 4, 14 and the back surface 16a of the back metal 16 of the pad 8b.

In this case, the coating is applied to the caliper claws 14, 1.
4 inner surfaces 14a, 14a and back surface 16 of back metal 16
It may be formed on at least one side with a,
When the shim plate 18 is interposed between the surfaces 14a and 16a, a coating may be interposed between at least one of the surfaces 14a or 16a and the shim plate 18. Of course, the coating may be formed on one or both sides of the shim plate 18.

The material with a low coefficient of friction constituting the film interposed between the inner surface 14a and the back surface 16a is preferably a wear-resistant and heat-resistant polymer compound such as tetrafluoroethylene resin (Teflon). used.

(Operation) The operation of the floating caliper type disc brake of the present invention constructed as described above during braking is the same as that of the conventional floating caliper type disc brake described above.

However, in the floating caliper type disc brake of the present invention, a material with a low coefficient of friction is used between the back surface 16a of the back metal 16 of the pad 8b located on the outside of the rotor 1 and the inner surface 14a of the caliper pawl 14. Because of the presence of the coating, the pad 8b can slide against the caliper pawl 14 with a light force.

Therefore, even if a strong force toward the anchor is applied to the pad 8b due to the friction between the friction material 15 and the rotor 1 during braking, this force will not be directly transmitted to the caliper pawl 14. The force transmitted to the caliper pawl 14 is much smaller than the force that attempts to move the pad 8b toward the anchor.

Therefore, the force that tries to rotate the caliper 3 around the anti-anchor side support part during braking is also weak, and the vibration of the caliper 3 during braking is also weak, causing the caliper 3 to make harsh noises during braking. It no longer vibrates so strongly that it emits.

At the same time, since the force pressing the friction material 15 of the pad 8b against the outer surface of the rotor 1 becomes almost uniform, uneven wear of the friction material 15 is reduced, and the friction material 15
Attenuation of the braking force and generation of noise due to the uneven wear of No. 5 are also prevented.

In addition, in order to further ensure the effect of preventing the force acting on the pad 8b from being transmitted to the caliper pawl 14, it is necessary to
It is effective to form a coating made of a material with a low coefficient of friction between the inner surface of the holder and the inner surface of the holder, and to apply grease between both surfaces 14a and 16a.

In addition, in the case of a guide pin type disc brake having a structure as shown in Figs. 1 to 3, a material made of a material with a low coefficient of friction is also provided between the back surface 16a of the back metal 16 of the inner pad 8a and the end surface of the piston 7. If a film is formed, even better effects can be obtained. However, the force that rotates the caliper 3 based on the friction between the inner pad 8a and the rotor 1 is generated by the outer pad 8a.
Since it is not as large as in case b, the effect is secondary.

c. Effects of the invention The floating caliper type disc brake of the present invention is configured and operates as described above, so it reduces the noise generated due to the vibration of the caliper during braking, and also reduces uneven wear of the friction material. It is practically effective as a disc brake that can effectively prevent this, does not cause discomfort to passengers, etc., and can exert stable braking force.

[Brief explanation of the drawing]

Figures 1 to 3 show an example of a floating caliper type disc brake to which the present invention is applied, with Figure 1 being a partial cross-sectional plan view, Figure 2 being a front view, and Figure 2 being a front view.
FIG. 3 is a sectional view taken along the line AA in FIG. 2. 1: Rotor, 2: Support, 3: Caliper,
4, 5: Pin, 6: Cylinder, 7: Piston, 8
a, 8b: padded, 9, 10: guide cylinder part, 1
1, 12: Sleeve, 13: Elastic bushing, 1
4: Caliper claw, 14a: inner surface, 15: friction material, 16: back metal, 16a: back surface, 17: anti-rattle spring, 18: shim plate.

Claims (1)

[Scope of utility model registration request] A caliper that can be freely displaced in the direction of the rotor's rotational axis is attached to a support fixed near the rotor that rotates with the wheel, and the inner surface of the caliper claw provided at the outer end of the caliper and the inner surface of the caliper A pair of pads supported by the supports are pressed against both sides of the rotor so as to be freely displaceable in the direction of the rotor's rotational axis between the pads and the outer end surface of a piston fitted in a cylinder provided at the end. In a floating caliper type disc brake that obtains braking force by moving the caliper, a coating made of a material with a low coefficient of friction is provided between the inner surface of the caliper pawl and the back surface of the pad that opposes the inside surface of the caliper pawl. A floating caliper type disc brake characterized by intervening.