JPS5846270Y2 - disc brake - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a caliper floating type vehicle disc brake.

Various types of caliper mounting devices for caliper floating type disc brakes are already known, but one type of caliper is fixed in a state where the caliper is elastically supported from the disc center side by a caliper support spring (hereinafter simply referred to as a spring). There is a widely used type in which the caliper is attached to a mounting member and the caliper is moved relative to the mounting member by sliding.

In disc brakes that have this type of caliper mounting device, a cylinder that generates braking force using hydraulic pressure is usually formed on one side of the almost saddle-shaped caliper that straddles the brake disc. , it is inevitable that the center of gravity of the entire caliper (including the cylinder, piston, etc.) will be biased with respect to the spring.

Therefore, in the past, springs were set so that the caliper would not separate from the guide surface of the mounting member due to the inertial force that acts on the center of gravity based on the acceleration of the vibration that occurs when the vehicle is driving on a rough road. The load was determined to be quite high.

If this set load is insufficient, the caliper will not only cause flapping vibrations (rattle phenomenon) when driving on rough roads, causing abnormal noise, but also foreign objects such as sand and mud between the caliper and the mounting member. enters and damages both sliding surfaces.

Moreover, if this condition continues for a long time, wear of the sliding movement will be accelerated,
As wear progresses, the spring set load decreases,
The rattle phenomenon of the caliper becomes more likely to occur, and as a result, the occurrence of foreign objects becoming trapped further increases, a vicious cycle repeating, and eventually the caliper becomes unusable.

Especially for calipers with built-in parking brakes,
The center of gravity of the entire caliper is further offset with respect to the spring, and in order to counteract the inertial force acting on the center of gravity, it is necessary to further increase the set load of the spring.

On the other hand, it is desirable that the set load of this spring be as small as possible in order to facilitate the assembly work of the caliper, which is performed not only during manufacturing but also when replacing brake pads. Drag of the outer pad due to increased sliding resistance of the caliper due to the frictional force between the caliper and the spring (the outer brake pad pressed against the disc by the caliper is pressed against the brake disc even after the brake is released In order to prevent the phenomenon 1), it is desirable that the set load of the spring be as small as possible.

The present invention was made with the purpose of providing a disc brake equipped with a caliper mounting device that satisfies both of these two contradictory demands. The caliper support part extends in the direction parallel to the axis and contacts the caliper from the center side of the disc rotor at the three parts near both ends in the longitudinal direction and presses it against the bracket. so that the contact force on the far side is greater than the contact force on the far side.
The point is that the set load of the spring is set asymmetrically.

In this way, the contact force of the spring as a whole against the caliper, that is, the adhesion force of the caliper to the bracket, is reduced, reducing the sliding resistance of the caliper, reducing drag of the brake, and at the same time reducing the force of the caliper when the vehicle is running. This makes it possible to effectively prevent the button rattle phenomenon from occurring.

The configuration and effects of the present invention will be described in detail below based on the drawings showing embodiments of the present invention.

FIG. 1 shows a first embodiment of the present invention.

In the figure, reference numeral 1 denotes a mounting member, which has an inverted U-shaped cross section and has a notch 1a for mounting a caliper 2 in the center thereof.

The mounting member 1 is a disk (not shown) that rotates together with the wheel.
It is fixed to a non-rotating member while straddling the

The caliper 2 is a substantially saddle-shaped member, and, like the mounting member 1, is mounted in the notch 1a of the mounting member 1 in such a way that it straddles a pair of brake paddles arranged on the outer periphery of the disc and on both sides of the disc.

The caliper 2 has a cylinder portion 2a on one side that generates a braking force using hydraulic pressure.

A piston (not shown) is slid into the cylinder part a, and when brake pressure fluid is supplied to the cylinder part 2a, this piston is pushed out from the cylinder part 2a and presses the pad against one surface of the disk. At the same time, the caliper 2 receives the reaction force.

The caliper 2 has two protrusions 2b with a triangular cross section parallel to the axis of the cylinder portion 2a on both the front and rear surfaces.
are pressed against the mounting member 1 via the caliper guide 4 by springs 3 set at the front and rear.

The caliper guide 4 is inserted between the caliper 2 and the mounting member 1 in order to facilitate the work of mounting the caliper 2 on the mounting member 1, and after assembly, it is integrated with the mounting member 1. Configure a bracket.

That is, the caliper 2 is elastically pressed against the guide surface by the spring 3 from the disk center side (lower side in FIG. 1), and moves on the guide surface formed by the caliper guide 4 facing toward the center of the disk. , which is mounted on a bracket so that it can slide in a direction parallel to the centerline of the disk.

Therefore, as described above, when the reaction force of the piston is applied to the caliper 2, the caliper 2 slides to the side opposite to the piston and presses another pad against the other surface of the disk.

The spring 3 is made by bending a piece of spring material into a shape that forms a roughly T-shaped space inside.
A caliper support portion 3a that supports the caliper 2 by contacting the disk center side surface of the protrusion 2b, and two leg portions 3b formed in a direction perpendicular to the caliper support portion 3a.
, 3c.

In this embodiment, the caliper support portion 3a extends along the protrusion 2b and is entirely linear, so that it appears to be in contact with the protrusion 2b along its entire length, but in reality it extends along the protrusion 2b in the longitudinal direction. It comes into contact with the protrusion 2b at three parts near both ends of the caliper, and presses the protrusion 2b against the caliper guide 4, that is, the mounting member 1.

The legs 3b and 3c are parts that are elastically deformed in the mounted state and generate a force (hereinafter referred to as set load) that presses the caliper support part 3a against the caliper 2, but the mounting member 1
The connecting parts 3b', 3c', intermediate engaging parts 3b, 3C are bent into a slightly complicated shape for convenience of installation.
〃, the main part 3b″f, 3c/// button and the tip engaging part 3bllll, 3cIffl, etc.

The spring 3 is installed on the two side walls 1b and l of the mounting member 1.
Inserting the main parts 3b'' and 3c'' between c,
Intermediate engaging portions 3b//, 3c//button and tip engaging portions 3b////, 3cIffl, respectively, are notches 1ds1esIf provided in the mounting member 1.
, 1g.

These notches 1d, le, if, and 1g are arranged in the leg portion 3 so that the caliper support portion 3a presses the caliper 2 against the guide surface by the elastic force generated by elastic deformation in the installed state.
b, 3c constitutes a means for holding.

Therefore, in the assembled state, the tip engaging portion 3b""30"
The caliper support part 3a of the spring 3, which holds the legs 3b and 3c at two points, `` and the intermediate holding parts 3b'' and 3c'', respectively, is forcibly pushed down by the caliper 2, Each leg 3b, 3c will be elastically deformed.

However, as shown in FIG. 2, in the spring 3 of this embodiment, the length 1□ of the main portion 3c'' is shorter than that of the main portion 3b'', so that the leg portion 3c can be elastically deformed. This requires a larger force than when elastically deforming the leg portion 3b by the same amount.

Therefore, the contact force of the caliper support part 3a against the caliper 2 is not the same on the left and right sides as in the conventional case, but on the right side (the cylinder part 2a
The part closest to ) is larger than the left part.

In this way, by increasing the contact force of the caliper support part 3a against the caliper 2 on the side near the center of gravity of the caliper (including the entire caliper piston, parking brake device, etc.) and decreasing it on the opposite side, the total set load can be kept low. This makes it possible to effectively prevent the occurrence of the rattle phenomenon while preventing an increase in the sliding resistance of the caliper.

A second embodiment of the invention is shown in FIG.

In the first embodiment described above, by shortening the length of the leg 3C to be elastically deformed, the set load on the leg 3C side was increased to the set load on the leg 3b side. For example, the length of the leg portion 3c is unchanged, and the intermediate engagement portion 3c is
The difference is that the same objective is achieved by shortening the distance of 1° between the caliper support portion 3a and the caliper support portion 3a.

In other words, in this embodiment, if the distance between the force point (caliper support part 3a) and the fulcrum (intermediate holding part 3c) is shortened, the force required to displace the force point by the same amount will be reduced when the distance between the two is long. This takes advantage of the fact that it becomes larger compared to .

Furthermore, a third embodiment is shown in FIG.

In this case, the notches 1e and Ig for holding the leg part 3c are located above the notches 1d and If for holding the leg part 3b.

According to this embodiment, even if the shapes and dimensions of the leg portions 3b and 3c are the same, the amount of elastic deformation of the leg portion 3c is greater than that of the leg portion 3b in the assembled state. , therefore the leg 3C
The set load is heavier on the side.

Further, a fourth embodiment is shown in FIG.

In this embodiment, the notches 1e, Ig and the notches 1d, 1f are provided in completely symmetrical positions, and the shape of the spring 3 is asymmetrical to obtain substantially the same effect as the third embodiment.

That is, the connecting portion 30 of one leg 3C of the spring 3
If the bending amount h1 with respect to the main portion 30''' of the leg portion 3b is made larger than the bending amount h2 of the connecting portion 3b' of the leg portion 3b, the amount of elastic deformation of the leg portion 3C in the assembled state can be reduced to the elastic deformation of the leg portion 3b. The same effect as in the third embodiment can be obtained in that the amount can be increased.

As described in detail above, the present invention can improve the caliper support portion of the spring by making very slight changes to the spring 3 and/or the means for holding the legs 3b, 3c of the spring 3. The contact force of the caliper 3a against the caliper 2 is large in the part close to the center of gravity of the entire caliper, and small in the part far from the center of gravity of the entire caliper, thereby keeping the total contact force relatively low.As a result, the sliding resistance of the caliper 2 is reduced. This provides an excellent effect of effectively preventing the occurrence of the lazotre phenomenon while preventing the occurrence of brake drag 9.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a plan view of the spring shown in FIG. 1. FIG. 3 is a diagram corresponding to FIG. 2 showing another embodiment of the present invention. FIG. 4 is a side view of main parts showing still another embodiment of the present invention. FIG. 5 is a side view showing the shape of a spring used in yet another embodiment of the present invention before installation. 1: Mounting member, 1a: Notch, 1b, 1c: Side wall, 1
d, 1 e, 1 f, 1 g'', notch,
2: Caliper, 2a rainbow cylinder part, 2b: projection, 3 spring (caliper support spring), 3a: caliper support part, 3b, 3c: leg part, 3 b' s 3 c
': Connecting part, 3b〃, 3c〃: Intermediate engaging part, 3b'''3
0″′: Main part, 3b/Ilr, 3c////:
Tip engaging part, 4: Caliper guide.

Claims (1)

[Claims for Utility Model Registration] A rotating disc, a pair of brake pads arranged on both sides of the disc, the whole forming a saddle shape, and straddling the outer periphery of the disc and the pair of brake pads. a caliper arranged and provided with a cylinder on the side; a bracket provided in a fixed position and guiding the sliding movement of the caliper in a direction parallel to the disk center line by means of a guide surface facing toward the center of the disk; A caliper support spring that is manufactured by bending a piece of spring material and has a caliper support part that extends in the sliding direction of the caliper, and two leg parts that are formed in a direction substantially perpendicular to the caliper support part. and each of the leg parts of the caliper support spring is elastically curved, and the elastic force causes three parts near both ends of the caliper support part in the longitudinal direction to move from the center side of the disc to the caliper. and a means for holding the caliper in such a manner that the caliper is brought into contact with the guide surface, and the caliper is held in such a manner that the caliper is pressed against the guide surface. A disc brake characterized in that the set load of the caliper support spring is set asymmetrically so that the contact force on the caliper is greater than the contact force on the far side.