JPS5817133Y2 - Vibration prevention device for automobile disc brake pads - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vibration prevention device for disc brake pads in automobiles.

A disk that rotates together with the wheel of an automobile, an inner pad that is supported on one side of the disk on a fixed part and movable in the direction of the axis of rotation of the disk, and also supported on the fixed part so as to be movable in the direction of rotation of the disk. A caliper formed in a U-shape so as to straddle the peripheral edge of the disk, a cylinder provided on the caliper, a piston that slides within the cylinder and whose exposed end abuts and engages the inner pad, and a disk. A pair of arms extend from the caliper in the radial direction of the disc on the side opposite to the inner pad, and an outer pad supported by the arms and arranged to be able to engage with the surface of the disc on the side facing the disc of these arms. In new disc brakes, the support device for the outer pad reduces the noise emitted from the disc while the vehicle is running, and also facilitates the work of assembling the disc brake, installing the disc brake on a new vehicle, and replacing pads that have worn out due to use. Furthermore, there are still problems to be solved in order to solve these problems at a low cost.

In other words, the outer pad should be prevented from vibrating relative to the caliper while the vehicle is running, so that abnormal noises would not occur, and the outer pad, once supported by the caliper, should not fall off unnecessarily even if the caliper is in a position that would interfere with the outer pad. The problem is to use as few parts as possible to accomplish these things.

The present invention attempts to address each of the above problems, and
Concave notches are provided on opposing sides of both arms of the caliper, and a pair of protrusions are formed on the outer surface of the back plate of the outer pad, and both protrusions fit into the corresponding concave notches. However, its size and position on the back plate are set so that it can slide along the direction of the disk rotation axis, and these recesses and protrusions provide the above-mentioned support by the arm of the outer pad, and the back plate of the outer pad is supported by the arms of the outer pad. A leaf spring-like arcuate part that is located in a long and narrow gap formed between the outer periphery and the inner surface of the caliper and has an elastic force in the bending direction, and the arcuate parts extend at both ends of the arcuate part to form a U-shape. a pair of clip portions bent in a shape to grip a part of the outer periphery of the back plate; and a pair of clip portions that are bent in a shape such that they grip a part of the outer periphery of the back plate; a bent part that bends at the same time, and an anchor part that is located at a terminal end that extends beyond the clip part after the bent part is reversely bent, and that abuts and engages with a part of the caliper by the elastic force of each of the bent parts. It is equipped with a spring formed by shaping the entire spring.

In the present invention configured as described above, the outer pad is biased inward in the disk radial direction with respect to the caliper by the elastic force of the arcuate part of the spring, thereby fitting into the recessed part of the arm of the caliper. The protrusion of the outer pad is pressed against the disc radially inward shoulder of the concave notch, and the elastic force of the bent portion of the spring presses the outer pad against the surface of the caliper arm facing the disc. Vibrations relative to the caliper in the disk radial direction and in the disk rotational axis direction are prevented, and even though vibrations caused by unevenness on the road surface are applied to the disk brake while the vehicle is running, the outer pad does not make any noise.

The elastic forces of the arcuate and bent portions of the spring as described above work to keep the protrusion of the outer pad in a state where it fits into the recessed part of the caliper arm, and the clip part of the spring acts on the back plate of the outer pad. Because the outer pad grips a part of the outer periphery of the caliper, the outer pad, which is partially supported by the caliper using a spring, will not fall off unnecessarily no matter what position the caliper is in. This makes it easier to assemble disc brakes, install disc brakes on new vehicles, and replace pads.

Furthermore, since the above-mentioned vibration prevention and prevention of the outer pad from falling off is achieved by using one spring, the cost is also reduced.

Hereinafter, embodiments of the present invention will be described based on the drawings.

In FIG. 1, a brake disk 1, which is partially indicated by a two-dot chain line approximately in the center, rotates together with a wheel W, which is also indicated by a two-dot chain line at the left end of the figure.

Its rotation axis (not shown) is located at the bottom of the figure and off-line.

Two brake pads 2 and 3 are arranged on both sides of the upper peripheral edge of the disk-shaped disk 1, and these pads 2 and 3 are applied to the rotating disk 1. Braking is achieved by pressing in a pinching manner.

The pressure is exerted by a caliper 4 and a piston 5.

The caliper 4 has a cylinder 6 and an arm 7.

The piston 5 in the cylinder 6 is pushed out to the left in the figure by receiving the hydraulic pressure in the pressurizing chamber 8, and presses the pad 2 (also referred to as an inner pad) against the disk 1.

The other pad 3 (also called outer pad) is the caliper.
4, the disk 1 is pressed by the reaction force of the piston.

The inner pad 2 is directly supported by a wheel fixing portion 9 shown at the bottom of FIG. 1 so as to be slidable in a direction parallel to the plane of the paper.

The other pad 3 is supported by a caliper arm 7, and the caliper 4 is supported on a fixed part 9 so as to be able to slide parallel to the plane of the drawing, similar to the inner pad.

The main point of this proposal is the structure of the attachment of the outer pad 3 to the arm 7.

The mounting or supporting structure will be explained below with reference to FIG. 2 and the following figures.

In FIG. 2, the lower wheel fixing portion 9 has an upwardly facing U-shape, and has two parallel guide rails 11 on the left and right in a direction perpendicular to the plane of the paper.

The caliper 4 at the front in the figure supports the sliding portion 12 protruding left and right on both guide rails so as to be able to slide in a direction perpendicular to the plane of the paper, and prevents it from moving upward from the surface of the guide rail 11. , the back surface of the housing portion 12 is elastically pressed by a spring 13.

The spring 13 has an overall shape, has an anchor part 14 at the lower end adjacent to both sides of the fixed part 9, and has an upper pressing part 15 in pressure contact with the back surface of the sliding part 12, and is attached by a mounting bolt 16. Attach to the individual part 9.

With this attachment, the caliper 4 is supported on the guide rail 11 so that it will not fall off despite the severe vibrations of the wheels while the vehicle is running.

The main structure of the present invention will be explained below with reference to FIG.

The arm 7 at the left end in Fig. 1 is spaced apart from each other by 2 as shown in Fig. 2.
Books provided.

The outer pad 3 is attached to these two arms 7.

The installation is carried out by placing the outer pad 3 in a predetermined position on the caliper, and then attaching the caliper 4 to the fixed part 9.
Once the outer pad has been assembled, the outer pad cannot be removed separately unless it is removed together with the caliper.

Therefore, the structure for attaching the outer pad 3 to the arm '7 must first be simple so that the assembly work can be done quickly and easily.

Therefore, as shown in FIG. 2, the back plate 3 of the outer pad 3
A has a pair of protrusions 17 protruding from the back surface to a height of several mm in actual size.

The operating surfaces of both protrusions 17 are on the outside in FIG. 2 and are rectangular, and rectangular recessed portions 18 are provided on the inner surfaces of both arms 7 to match this rectangular shape.

This recessed portion 18 holds the outer pad 3 so that it cannot move in the left-right direction or the up-down direction in FIG. 2.

On the other hand, as shown on the left side of FIG. 1, the back surface of the back plate 3a is in contact with the inner surface of the arm 7, and the pad 3 bonded to the opposite surface is in contact with the disk 1, and the inner pad 2 is attached to the opposite surface of the disk. are in contact with each other, and the inner pad 2 is in contact with the piston 5.

There is only a gap of around 1 mm between the contact parts of these parts even when the brake is not in operation, and when the brake is in operation, both pads 2 and 3 pressurize the disk 1 from both sides by filling up each gap. .

Disc 1 is attached to the caliper as shown by the two-dot chain line in Figure 2.
4 and rotates in the direction of the arrow shown at the lower right end of the figure.

Therefore, the torque in the direction of the arrow is also applied to the back plate 3a of the outer pad, and the torque is transmitted through either of the protrusions 17 of the back plate 3a or through either of the double-concave large portions 18, so that the rotation direction of the disk is It is received by one of the arms 7 depending on the direction.

The torque received by the arm 7 is received by the guide rail 11 of either the fixed or non-rotating portion 9 of the wheel via the sliding portion 12 on either the left or right side of the caliper 4.

Disc brakes are usually installed on the front wheels of four-wheel vehicles, and when the position shown in Fig. 2 is rotated 90 degrees counterclockwise, the forward rotation direction of disc 1 is rotated clockwise in the same figure. It is arranged as follows.

The assembly structure consisting of both the protrusions 17 and the large concave portions 18 acts to receive the torque during braking operation as explained above, but when the brake is not operating, the outer pad 3 is released from the braking pressure and is in a relaxed state. become.

Therefore, noise is generated between the protrusion 17 and the recessed part 18 due to severe wheel vibration caused by the vehicle running.

The feature of this project is that the outer pad 3, which causes the above noise,
In order to prevent vibration of the outer pad 3, one spring
The structure is configured such that the outer pad does not move loosely within the above-mentioned gap, and also facilitates the assembly operation of attaching the outer pad to both arms 7 together with the spring, thereby facilitating work when assembling a new car or servicing the vehicle. It is something to tighten.

The leaf spring indicated by the reference numeral 20 at the upper left of FIG. 1 has a shape as shown in FIG. 3 when viewed from the left side of the figure in the direction of arrow A.

In FIG. 3, all parts other than the spring 20 are indicated by two-dot chain lines.

When the spring 20 is freely released, it has an original shape that is further curved downward in the figure than the state shown in FIG.

The spring 20 is distorted in the direction of straightening its original shape.
As shown in Figure 1, the upper edge 3b of the back plate 3a and the caliper
4 and a thin arc-shaped seat surface 4a formed on the inner surface of the seat 4 (FIG. 3).

The leaf spring 20 is always attached to the back plate 3 of the outer pad in FIG.
Apply force to a to press it downward.

This force is applied to each concave notch 18 through each protrusion 17 of the back plate 3a.
It can be received on the shoulder 18a of the person.

By pressing both protrusions 17 against the shoulders 18a of each recessed notch 18 with the force of the spring 20 in this way, the outer pad 3 is prevented from freely moving, and therefore the vibration of the outer pad 3 is suppressed while the vehicle is running, especially when the brake is not activated. This can prevent the occurrence of abnormal noise.

The vibrations of the pad that are prevented in this manner include vibrations in the vertical direction in FIG. 3, as well as vibrations in the direction of the rotational axis of the disk, that is, in the direction perpendicular to the plane of the drawing.

It is possible to prevent vibrations or rattles in either direction.

The above is the effect after assembling the spring 20, but next, the effect upon assembling will be explained below.

While keeping the pad 3 and spring 20 attached in the state shown in FIGS. 1 and 3, place the caliper 4 on the guide rail 11 of the wheel fixing part 9 as shown in FIG.
The work of attaching both springs 13 and bolts 16 is the assembly work.

When attaching the caliper 4 to the fixed part 9 in this way, since the disk 1 has already been fixed to the rotating shaft of the wheel, this disk 1 is attached to both pads 2 and 3 as shown in FIG. Mount the caliper 4 while moving it from the upper part to the lower fixed part 9 in FIG.

In the figure, the caliper 4 and the fixed part 9 are shown in relative positions in the upper and lower positions, but in order to actually install the caliper, rotate the caliper 4 and the fixed part 9 by 90 degrees counterclockwise.
is attached to the wheel fixing part 9.

During the assembly process, the outer pad 3, which is attached to both arms 7 of the caliper through the protrusion 17, recessed part 18, spring 20, etc., as shown in FIGS. It is necessary that the caliper does not fall off from the caliper even if it is subjected to movement.

The spring 20 also serves to prevent this falling off.

The structure will be explained below. As shown in FIG. 3, the spring 20 has locking portions 21 at both ends of its arcuate portion 22. As shown in FIG.

The locking portion 21 appears as shown in FIG. 4 when viewed in the direction of arrow B at the right end of FIG.

This locking part 21 is a bent part 21 bent at an acute angle between an inverted U-shaped clip part 21a and an anchor part 21b.
It has C.

In the freely released state, the bent portion 21C is bent at an even more acute angle than in the state shown in FIG. 4 in its original shape.

Therefore, in the state shown in FIG. 3, the elasticity of the bent portion 21C acts so that the upper end of the back plate 3a held by the clip portion 21a is pressed against the surface of the arm 7 shown by the two-dot chain line along the arrow C.

The anchor reaction force at this time is given by the side surface of the sliding portion 12 that the anchor portion 21b comes into contact with.

If we look at Figure 3, the pressure contact force along the arrow C mentioned above is as follows:
This is the force that presses the back plate 3a perpendicularly upward from the plane of the drawing.

On the other hand, the force applied to separate the protrusions 17 of the back plate from the concave peaks 18 is a force directed toward the rear surface perpendicular to the plane of the paper.

Therefore, the force in the direction of the arrow C applied by the bent portion 2IC of the spring 20 is a force that resists this force that attempts to separate the arm 7 from the outer pad 3 and the spring 20.
When attached to the bending portion 21C, the spring force of the bending portion 21C applies such a spring force that the attached state can be maintained during the assembly work.
Set to C.

When a force is applied to the back plate 3a of the attached outer pad 3 in the direction of the arrow while resisting the spring force of the bent portion 21C as shown in FIG. 4, the back plate is rotated to a position near the position shown in 3a'.
Both protrusions 17 on the rear surface of the back plate are easily removed from the recessed notches 18, and at the same time, the back plate 3a is bent as shown in FIG. The outer pad 3 is pushed out in the direction of arrow E, and is separated from both arms 7.

After this separation, the spring 20 is moved to the bent portion 21 in FIG.
C rotates slightly counterclockwise to the position 21C' and then stops.

The above steps are the steps for removing the outer pad 3 once installed, but if these steps are followed in reverse order, the outer pad 3 can be assembled to the caliper 4.

That is, when the above-mentioned spring 20 has its bent portion 21C slightly rotated counterclockwise and remains stationary at the position 21C', the upper ends of the back plate 3a are attached to the clip portion 21a of the spring 20. When the back plate 3a is engaged and a force for rotating it in the direction opposite to the arrow from the position 3a' and a force directed upward in the figure are simultaneously applied to the back plate, the back plate 3a will be in the state shown by the solid line in the figure. It is fitted onto the arm 7 through engagement with the protrusion 17 and the recessed notch 18 .

The above is the operation of attaching the outer pad 3 to the caliper during assembly, and the operation is extremely easy.
Even if the caliper is assembled onto the fixed portion 9 of the wheel as shown in FIG. 2 while being mounted up and down, the outer pad 3 will not come off from the caliper 4.

Note that before attaching the outer pad, the spring 20 is
It is an easy operation to install it inside the arm 7 of the caliper so that C is at the position 21C'.

FIG. 5 shows the state immediately before the spring 20 is molded.

In the figure, short dotted lines d1 to d6 indicate locations where the spring metal plate is bent as shown in FIG. 4 to form the locking portion 21.

By this bending, a clip portion 21a, a bent portion 21C, an anchor portion 21b, etc. are formed in the locking portion 21.

That is, at the dotted line d1 in FIG. 5, the stiffener is bent at a nearly right angle toward the back of the drawing, and at the next dotted line d2, it is also bent at a nearly right angle toward the back of the drawing, and then at the next d3. At each dotted line in d4, fold it close to each other in a U-shape toward the front of the page, then at the next dotted line at d5, bend it at an obtuse angle toward the front of the page, and at the next dotted line at d6, make it rounded and bend it toward the back of the page. Bend it into a small semicircle.

The entrainment stop portion 21 is formed in this manner. Next, the three short vertical solid lines shown at intervals in the arcuate portion 22 at the top of FIG. 5 indicate where the spring material should be bent sharply.

The arcuate portion 22 is bent at these three points to form the arched portion 22 as shown in FIG.
Can be done.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the device according to the invention taken along the line II in Figure 2, Figure 2 is a front view of the disc brake equipped with the invention, Figure 3 is a front view of the spring of the invention, and Figure 4 is its side view. , FIG. 5 is a plan view of the same before molding. 1... Teisk, 2, 3... Pad, 4... Caliper 15... Piston, 7... Arm, 3a... ...Back board, 9.
...Wheel fixing part, 13...Spring, 17...Protrusion, 18...Concave cutout, 2
0... Spring, 21... Locking part, 22...
...Arcuate part.

Claims (1)

[Scope of utility model registration request] A disk 1 that rotates together with the wheels of an automobile, an inner pad 2 supported on one side of the disk on a fixed part 9 and movable in the direction of the rotational axis of the disk, and an inner pad 2 that is also movable in the direction of the disk's rotational axis on the fixed part 9. A caliper 4 that is movably supported and formed in a U-shape so as to straddle the peripheral edge of the disk 1, and a cylinder 6 provided on the caliper 4.
, a piston 5 that slides within the cylinder 6 and has its exposed end abuttingly engaged with the inner pad 2, a pair of arms 7 extending along the radial direction of the disk from the caliper 4 on the opposite side of the inner pad 2 with respect to the disk 1; In the disc brake, the outer pad 3 is supported by the arm 7 on the side facing the disc 1 of the arm 7 and is arranged so as to be able to be held on the surface of the disc 1. A pair of protrusions 17 are formed on the outer surface of the back plate 3a of the outer pad 3, and both protrusions 17 fit into the corresponding recesses 18 and slide along the disk rotation axis direction. The size and position on the back plate 3a are set movably, and these concave notches 18 and protrusions 1
7 provides the above-mentioned support of the outer pad 3 by the arm 7, and connects the outer peripheral edge of the back plate 3a of the outer pad 3 with the caliper.
a leaf spring-shaped arcuate portion 22 located within a long and narrow gap formed between the inner surfaces of the arcuate portion 2 and the arcuate portion 2;
A back plate 3 extends from the arched portion at both ends of 2 and is bent in a U-shape.
A pair of clip portions 21a are formed to grip a part of the outer peripheral edge of the disk 1a, and a pair of clip portions 21a extend from each of the clip portions 21a in the radial direction of the disc 1 along the outer surface of the back plate 3a, and then extend in half. The bent portion 21C is turned and bent, and the clip portion 21a is further bent after the bent portion 21C is reversely bent.
Each of the bent portions 21C is located at the terminal end extending beyond the
Vibration prevention for a pad of a disc brake for an automobile, characterized in that the spring 20 is formed by forming a whole series of an anchor part 21b that abuts and engages with a part of the caliper 1 due to its elastic force. Device.