JP2566400Y2 - Disc brake double shim - Google Patents

Description

[Detailed description of the invention]

[0001]

This invention relates to a two-layer disc shim in which an inner shim having rubber coating on both sides of a thin steel plate and an outer shim of a thin stainless steel plate are overlapped to prevent noise generation during braking. About.

[0002]

2. Description of the Related Art In a disk brake, when a lining of a pad is pressed against a rotor interlocking with a wheel to perform braking, the pad may vibrate mainly due to the non-planarity of the rotor and generate noise.

In order to prevent this phenomenon, as shown in FIG. 12, a thin metal plate shim 5 is provided between a piston 3 for pressing a pad 1 against a rotor 2 and a pawl 4 and pad backings 1a, 1a.
Inserting has been done. There is only one shim 5, but in order to achieve a good noise prevention effect, an inner shim 5a in which rubber is coated on both surfaces of a thin steel plate and an outer shim 5b made of a thin stainless steel plate are stacked. Stacked shims have come to be used. The thickness of the inner shim 5a and the outer shim 5b in FIG. 12 are exaggerated.

In the case of a double-layered shim, each shim is
In order to prevent the inner shim 5a from falling off from the gap between the inner shim 5a and the piston 3 or the claw 4, the hooks 6, 6 are bent at both ends in the rotor radial direction of the inner shim 5a, as shown in FIG. , 6 sandwich the back metal 1a and similarly form hook claws 7, 7 on the outer shim 5b so as to sandwich the inner shim 5a.

When the hooks 6, 6 are bent and formed on the rubber-coated inner shim 5a, the rubber coating is pulled outside the bent portion and compressed inside, so that the rubber coating is broken and peeled off. Then, the thin steel plate in this portion is corroded, the nail is broken, and a failure occurs in which the inner shim falls off. Therefore, it is not preferable to form the hook on the inner shim coated with rubber.

[0006] As a double-layered shim in which such a hook is not bent and formed on a rubber-coated inner shim, there is a shim described in Japanese Utility Model Publication No. 2-20506.

As shown in FIG. 14, projections 8, 8 are formed at the outer end in the rotor radial direction of a flat inner shim 5a coated on both sides with rubber, and the projections 9, 9 are formed at the inner end in the same direction.
And a recess 10 is formed outside the protrusion 9 at the inner end.

In order to attach the shim to the back metal 1a of the pad, a hooking claw 7a formed by bending the outer shim at the outer end in the rotor radial direction is passed between the projections 8 of the inner shim .
Hook the outer end of the rotor in the radial direction , and hook the hook 7b at the inner end of the outer shim in the radial direction of the rotor through the recess 10 of the inner shim.
The inner shim 5a and the outer shim 5b are hooked on the inner end in the rotor radial direction .
Movement of the rotor circumferential direction, a projection 11 is formed in the rotor circumferential ends of the outer shim 5b, the anchor portion of the support which engages the projection 11 in the groove 12 of the backing metal 1a (not shown) This
It is prevented by Rukoto to contact. As a result, the inner shim 5a in which the projections 8, 9 are engaged with the outer shim also becomes immovable in the rotor circumferential direction.

As another means for immovably engaging the inner shim and the outer shim, as shown in FIG. 15, a structure of the inner shim 5a rubber-coated on both sides of the rotor is used. The nails 14, 14, which are inclined in the up and down direction, are formed in a bent manner, and holes 13, 13 for engaging the nails are formed in the outer shim 5 b.
In some cases, the inner and outer shims are immovably overlapped in any direction due to the engagement of the inner and outer shims.

[0010]

In the structure shown in FIG. 14, the protrusion 9 at the inner end of the inner shim 5a in the rotor radial direction reliably prevents the hook 7b of the outer shim 5b from moving in the rotor circumferential direction. In this case, the projection length of the projection 9 must be increased. Accordingly, there is a portion of the back metal 1a projecting inward in the rotor radial direction by the amount of the protrusion 9. Backing metal, to freely move in the portion of the shim does not contact the support by an amount back metal of the projecting portion without must keep to be shifted in the rotor radially outward, In this way, the protruding portion thereof is supported The necessity of avoiding hitting is disadvantageous in that the effective area of the lining of the pad in contact with the rotor is reduced and the required braking force is obtained.

In the structure shown in FIG. 15, the nail 14 is formed by bending the inner shim 5a coated with rubber.
As in the case of the hook 3 of FIG. 3, there is a disadvantage that the rubber coating is broken, the thin steel plate which is the center of the inner shim is corroded, and the breakage occurs.

[0012]

According to the present invention, an elongated hole is formed at the outer end of the inner shim in the radial direction of the rotor so as to pass a hooking claw at the outer end of the outer shim in the same direction. The portion is a flat surface that does not protrude from the back metal, and a two-layered shim is formed by this inner shim and an outer shim formed by bending hook claws for holding the back metal at inner and outer ends in the rotor radial direction.

[0013]

The outer shim is fixedly connected to the pad by holding the back metal by the hook claws. The inner shim is attached to the pad by the hook of the outer shim which engages the elongated hole at the outer end of the rotor in the radial direction, and can be immobilized by further providing a projection which hits the anchor portion of the support. Since the rotor inner radial end of the flat inner shim enters between the back metal and the outer shim and does not protrude from the back metal, the rotor inner radial end of the back metal can be sufficiently close to the support, and therefore the pad lining area Can be increased.

If a shallow concave portion is formed in the back metal and the hook at the inner end of the outer shim in the radial direction of the rotor is inserted into the concave portion, the back metal can be made closer to the support and the lining area can be increased.

[0015]

1 to 5 show a first embodiment of the present invention.
FIG. 1 is a front view showing a state in which inner and outer shims and a back metal are stacked, and FIG.
3 is a front view of the inner shim, FIG. 3 is a front view of the outer shim, FIG. 4 is a front view of the backing metal, and FIG. 5 is a sectional view taken along line AA of FIG.

The inner shim 15 coated on both sides with rubber is formed with a projection 17 projecting from the outer end of the back metal 16 which is recessed in the rotor radial direction when assembled. A horizontally long and narrow hole 20 into which 19 is inserted is formed. The elongated hole 20 is located above the outer end of the back metal 16.

The outer shim 18 made of a thin stainless steel plate is inserted into the elongated hole 20 of the inner shim at the outer end in the radial direction of the rotor, and forms a hooking claw 19 for suppressing the outer end of the back metal 16 in the radial direction.
A hooking claw 23 for suppressing the inner end of the back metal is formed at the inner end.

The back metal 16 has an anchor portion 2 as usual.
1 are formed at both ends in the circumferential direction of the rotor, and concave portions 25 for engaging the hooks 23 of the outer shim 18 are formed at inner ends in the radial direction of the rotor.

[0019] The inner shim 15, the outer shim 18, is shown in Figure 1 when assembled back plate 16, the portion of the protrusion 17 of the inner shim is as shown in FIG. 5 shows the A-A cross section.

The outer shim 18 is connected to the pad by holding the back metal 16 at the hooking claws 19 and 23 at the inner and outer ends of the rotor in the radial direction, and the inner shim 15 is hooking claw of the outer shim inserted into the elongated hole 20. This engagement prevents the inner shim 15 from moving from the pad and the outer shim in the circumferential direction of the rotor during braking.

6 to 10 show a second embodiment of the present invention. FIG. 6 is a front view showing a state in which inner and outer shims and a back metal are overlapped.
7 is a front view of the inner shim, FIG. 8 is a front view of the outer shim, FIG. 9 is a front view of the back metal, and FIG. 10 is a sectional view taken along the line BB of FIG.
The same parts as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

At both ends of the inner shim 15 in the circumferential direction of the rotor, protruding portions 22 which are close to the anchor portions 21 of the support are formed.
26 is a slit formed in the inner shim to hold grease.

When the inner shim 15, the outer shim 18, and the back metal 16 are assembled, the state is as shown in FIG. 6, and the projection 17 of the inner shim is as shown in FIG.

The outer shim 18 is connected to the pad by holding the back metal 16 at the hooking claws 19 and 23 at the inner and outer ends of the rotor in the radial direction, and the inner shim 15 sandwiched between the outer shim and the back metal has the elongated hole 20. Supported by the hooks 19 of the outer shim inserted through the inner shim 15 during braking without coming off the pad and the outer shim.
Is prevented by the contact between the protrusion 22 and the anchor 21 of the support. The gap between the projection 22 of the inner shim and the anchor portion 21 is smaller than the gap between the elongated hole 20 of the inner shim and the hook 19 of the outer shim in the rotor circumferential direction. To be stopped by the part. In addition, since the hook 23 is inserted into the recess 25, the inner end of the outer shim 18 in the rotor radial direction does not protrude from the inner end of the back metal 16.

FIG. 11 shows a third embodiment of the present invention in which the shapes of the inner and outer shims and back metal are changed. Parts equivalent to those in the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted.

[0026]

[Effects of the invention] (1) The inner shim with rubber coating on both sides is provided with a slot 20 on the flat surface to engage with the hook of the outer shim to prevent it from falling off. There is no fear of damaging the rubber coating and corroding the thin steel plate.

(2) Therefore, the durability of the shim is improved.

(3) Since the lower end of the inner shim 15 in the rotor radial direction is flat and sandwiched between the back metal 16 and the outer shim 18 and does not project from the back metal, the gap between the inner shim 15 and the support is not narrowed.

(4) Therefore, it is advantageous to increase the lining area of the pad to increase the control force.

[Brief description of the drawings]

FIG. 1 is a front view of a first embodiment showing a state where inner and outer shims and a back metal are overlapped.

FIG. 2 is a front view of the inner shim of the above.

FIG. 3 is a front view of the outer shim of the above.

FIG. 4 is a front view of the same back metal.

FIG. 5 is a sectional view taken along line AA of FIG. 1;

FIG. 6 is a front view showing a state in which inner and outer shims and a back metal according to the second embodiment are overlapped.

FIG. 7 is a front view of the inner shim of the above.

FIG. 8 is a front view of the outer shim of the above.

FIG. 9 is a front view of the same back metal.

FIG. 10 is a sectional view taken along line BB of FIG. 6;

FIG. 11 is a front view similar to FIGS. 1 and 6 of a third embodiment.

FIG. 12 is a side view schematically illustrating a general structure of a disc brake using a double-layered shim.

FIG. 13 is an exploded perspective view illustrating a conventional two-layered shim.

FIG. 14 is an exploded perspective view showing a conventional example in which a hook is not bent and formed on an inner shim.

FIG. 15 is an exploded perspective view showing a conventional example in which an inner shim is supported by an outer shim.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pad 1a Back metal 1b Lining 2 Rotor 3 Piston 4 Claw 5 Shim 5a Inner shim 5b Outer shim 6 Hook claw 7 Hook claw 7a Hook claw 7b Hook claw 8 Projection 9 Projection 10 Depression 11 Protrusion 12 Groove 13 Hole 14 Claw 15 Inner shim 16 Back metal 17 Projection 18 Outer shim 19 Hook 20 Slender hole 21 Anchor 22 Protrusion 23 Hook claw 24 Groove 25 Recess 26 Slit

Continuation of front page (56) References JP-A-59-19729 (JP, A) JP-A-58-187632 (JP, U) JP-A-4-138137 (JP, U) JP-A 64-53641 (JP) , U) Japanese Utility Model Showa 62-45436 (JP, U) Japanese Utility Model Application 2-20506 (JP, Y2)

Claims (1)

(57) [Scope of request for utility model registration] A rubber coating is applied to both surfaces of a thin steel plate, a protrusion (17) is formed at an outer end in a radial direction of the rotor, and the protrusion is located outside the outer end of the back metal (16) in the same direction. The inner shim (15), which is entirely flat and does not protrude the inner end of the rotor in the radial direction from the backing (16), and is inserted into the elongated hole (20) of the inner shim. The hooking claw (19) to be formed is bent at the outer end of the rotor in the radial direction, and the hooking claw (19) holding the back metal (16) together with the hooking claw (19) at the outer end at the inner end in the same direction. 23) A two-layer shim of a disc brake comprising an outer shim (18) made of a thin stainless steel plate formed by bending the above (23).