JPS5835865Y2 - disc brake - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a floating caliper type disc brake for braking vehicles such as automobiles.

In such floating caliper type disc brakes, a boot is provided to keep the sliding part of the caliper's guide mechanism sealed, but the boot is sometimes twisted when bolts are tightened, increasing torsional stress on the bushing. Conventional floating caliper type disc brakes have the disadvantage of reduced durability.

Furthermore, there is damage to the metal sliding surface between the caliper and the bushing.

Problems such as jamming have also occurred.

The object of the invention is to eliminate these drawbacks and provide an advantageous floating caliper type disc brake.

The present invention will be explained below with reference to embodiments of the drawings.

In FIGS. 1 and 2, a well-known mechanism is attached to the spindle 3 on the wheel side opposite to the mounting fixture 2 on the frame side to which the suspension arm is assembled in an independent suspension system via the shock absorber and ball joint (not shown) of the knuckle 1. A hub 5 is rotatably supported via a bearing 4, a brake disc 7 is fixed to the hub 5 with bolts 6, and a tire rim 10 is attached to the flange portion 5a of the hub 5 with bolts 8 and nuts 9. 11 is fixed, and when the vehicle is running, the disk γ integral with the hub 5 and the tire 10 rotate together with respect to the knuckle 1 on the fixed side.

There is a bolt 12 near the frame side attachment 2 of the knuckle 1.
As a result, the two legs 13 and 14 are fixed a little apart in the disk rotation direction.

A substantially central portion of a portion 13a of the leg 13 parallel to the disk slide T is bent so as to protrude in the direction of rotation of the disk when the vehicle moves forward, and a portion 13b bent in a direction perpendicular to the disk 1 is provided at the tip of the portion 13a. is formed.

On the other hand, the substantially central portion of the portion 14a of the other leg 14 that is parallel to the disk 1 is bent so as to protrude in the direction of rotation of the disk when the vehicle is traveling backwards, and the tip of the portion 14a is also bent at right angles to the disk 1. A portion 14b is formed which bends in a certain direction.

A guide mechanism 16 is provided between the portions 13a, 14a of these legs 13.14 and the flange portions 15a, 15b of the caliper 15.
．． 16' is provided.

The guide mechanism 16 is connected to the flange 1 as detailed in FIG.
Bushings 1γ and 17 that movably support 5a.
A bolt 19 is screwed together with a washer 18 to the portion 13a, and a bolt 19 is inserted between the flange portion 15a and the bushing 17, with one end fitting into the annular grooves 15c, 15d on the flange side, and the other end fitting into the grooves 11b, 1γC on the bushing side. It consists of antirust boots 20a and 20b that are fitted together and are interposed, and the flange portion 15a moves along the bush 1γ during braking.

In addition, in such a configuration, the bush 17 is provided with a boot 20a for tightening the bolt.

Nut part 17a fixed to prevent damage to 20b
is formed, and the gap between the bush 1γ and the bolt 19 escapes machining errors during bolt tightening.

At the sliding portion of the flange portion 15a and the bushing 17, the annular flange-shaped seal portion 20C220d of the boot 20at20d is in contact with the annular grooves 15c, 15d.
The ends of the elastic boots 20a and 20b elastically support the bushing 1γ in the fitted state, thereby preventing poor phrasal diction due to scratches, biting, etc. when the flange portion 15a and the bushing 17 come into metal contact. , the flange portion 15a is positioned.

Further, a recess 15f in the center of the bushing insertion hole 15c in the flange portion 15a is filled with grease, thereby smoothing the sliding movement of the flange portion 15a and eliminating dragging after the brake is released.

The return action of the flange portion 15a after this brake release is as follows:
Seal parts 20 c and 20 d of boots 20 a and 20 b
This can also be done proactively by changing the shape of the groove 15ct15d' of the flange portion 15a.

The other guide mechanism 16' is constructed in exactly the same manner as described above and movably supports the other flange portion 15b of the carrier 15.

Further, as shown in FIG. 2, friction pads 21 held by a back metal 22 and friction pads 24 held by a back metal 25 are arranged so as to be in contact with both surfaces γa and 7b of the brake disc γ, respectively, and one back metal Caliper 1 behind 22
A piston 28 inserted so as to be moved by the brake oil pressure in the piston chamber 21 is in contact with the inside of the caliper 5, and an arm 15g of the caliper 15 extending across the disc T and extending toward the wheel is in contact with the back of the other back metal 25. A seal 29 and a boot 30 are provided between the caliper 15 and the piston 28 to prevent muddy water from entering.

Furthermore, in FIGS. 4 to 6, hooks 22a and 22b are formed on both sides of the back metal 22, and these hooks 22a
, 22b are inner corners 13c, 14 of portions 13b, 14b.
c are closely engaged with each other, and the back metal 25 also has a hook portion 25a.
and 25b are formed in the same way, and their hooks 25a
, 25b to the corner 13c.

14c, one corner 15h of the arm 15g of the caliper 15 and one hook 22a of the back metals 22, 25.
, 25a and the inner corner portions 22c, 25c, an anti-ladle spring 3 is formed by bending a flat plate into a substantially R-shape.
1 is interposed, and the other corner 15i of the arm 15g and both back metals 2
2, 25 Ikekata hook part 22b, inner corner part 22 of 25b
An anti-ladle spring 31' formed in the same manner is also interposed between d and 25d.

Note that these anti-ladle springs 31, 31' can also be constructed integrally.

This allows the back metal 22. which holds the friction pads 21.24.
25 is the hook part 22 a t 22 b and 25 a t 25
b prevents falling, and anti-ladle spring 31.
31' prevents vibration by moving outward, and the leg 13
, 14 between portions 13b and 14b.

When brake hydraulic pressure is supplied to the piston chamber 27 during braking, the movement of the piston 28 causes the back metal 22 to move to the hook portion 2.
2a, 22b at the corners 13c, 14 of the portions 13b, 14b.
c and is moved to press the friction pad 21 against the inner surface 1a of the disk T.

Then, due to the reaction force of the pressing force in this case, the caliper 15 also moves along the piston 28 along the bushes 11 of the guide mechanisms 16 and 16'.
The arm 15g that is integral with the caliper 15 causes the back metal 25 to move in the opposite direction to the hook portion 25a.

The friction pad 24 is pressed against the outer surface 7b of the disk T by being moved while the friction pad 25b is engaged with the corners 13c and 14c of the portions 13b and 14b.

In this way, the disc I is braked, and when moving forward, the braking torque is received by the portion 13a of one leg 13 due to the engagement between the hook portions 22a, 25a and the portion 13b, and when moving backward, the braking torque is received by the portion 13a of the other leg 13. 25b and the portion 14b, the portion 14a of the other leg 14 receives the dynamic torque ilJ, and the rotation of the disk T is stopped.

When replacing the friction pads 21, 24, the bushings 17 are fixed so as not to move by the nut parts 17a of the guide mechanisms 16, 16', and then the bolts 19 and the parts 13a are replaced.
, 14a, and then attach the caliper 15 to the legs 13, 14a.
By removing it from 14, the anti-ladle spring 31.
31 is also removed and the pads 21.24 are easily taken out together with the back metal 22.25.

The boots 20a and 20b serve to seal the sliding area between the bushing 17 and the flange portion 15a in order to prevent dust from entering the sliding area. Both ends of 20a and 20b are bushes 1
7 and caliper 15, so even when the bolt 19 is removed, the boots 20a and 20
The sealing by b is not inhibited.

According to the present invention, the bush 1γ has an irregularly shaped part capable of locking a tool, that is, a nut part 17a, and during assembly, a tool is fitted into the nut part 17a as a tool locking part, and the rotation of the bush 11 is prevented. is restrained by a tool via the nut portion 17a, and the bolt 19 is tightened.Thus, while the bolt 19 is being tightened, the bush 11 is prevented from rotating, and the elastic boot 20a.

Twisting of 20b is avoided.

Therefore, the torsion remains in the boot 20a after assembly, which increases the life and function of the boot 20a.

According to the present invention, the ends of the elastic boots 20a and 20b are interposed between the inner peripheral surface of the through hole 15e and the outer peripheral surface of the bush 17.

Therefore, the vibration transmitted from the caliper 15 to the vehicle body is
Elastic boots 20a.

20b, and brake squeal is appropriately suppressed.

The boots 20a and 20b also prevent scratches, jamming, etc. caused by metal sliding surfaces.

Furthermore, when relative movement occurs between the bushing 11 and the flange 15a, the portions of the elastic boots 20a and 20b interposed between the through hole 15e and the bushing 17 undergo elastic shear deformation, but from this deformation. The restoring force exerts a pad retraction effect, and pads 21, 2
4 is prevented from dragging.

When the portion l 3 b, 14b+J is subjected to brake torque, it is deformed, which tilts the caliper 15 via the bolt 19 and causes malfunctions such as uneven wear and dragging of the friction pads 21,24.

However, according to the present invention, the boots 20a, 2 which also serve as bearings
This problem is avoided since deformations at the flanged end of 0b are elastically absorbed.

Note that the elastic support at the flange-shaped ends of the elastic boots 20a and 20b is for normal brake use;
When braking on rough roads etc., sleeve 17 and through hole 1
Needless to say, it may come into contact with 5e.

[Brief explanation of drawings]

Figure 1 is a side view showing an example of the disc brake of the present invention, Figure 2 is a sectional view taken along the line ■-■ in Figure 1, and Figure 3 is a side view showing an example of the disc brake of the present invention.
-■ sectional view, FIG. 4 is a view from ■ in FIG. 1, FIG. 5 is a view from V in FIG. 4, and FIG. 6 is a view from ■ in FIG. 1 with the anti-ladle spring removed. 1...Knuckle, I...Disk, 1
3,14... Bait, 15... Caliper 15
ct15d... Annular groove, 15e... Through hole, 11... Bush 17a... Nut portion, 19... Bolt, 20a. 20b...Boots, 20 c t 20 d.
... Seal part, 21.24 ... Friction pad.

Claims (1)

[Scope of utility model registration request] Pads are arranged on both sides of a brake disc that rotates integrally with the wheel, and are movable in the axial direction of the brake disc using a guide mechanism, and housed in a caliper mounted on a fixed member that is integral with the knuckle. A floating caliper type in which one side of the pad is directly pressed against the brake disc by a piston, and the other side of the pad is pressed against the brake disc by moving in the opposite direction to the caliber piston due to the reaction, thereby performing a braking action. In the disc brake, the guide mechanism has a through hole provided in the caliper, two annular grooves provided on the inner surface of the through hole near both ends of the through hole, and a deformed part that can be locked with a tool at the end. A hollow bushing is loosely fitted into the hole and protrudes from both ends of the through hole, one end is hermetically held by the bushing in a fixed axial position, and the bushing is fitted into the annular groove and has an inner surface bearing the bushing. two elastic boots each having a second end that is hermetically held by the caliper and disposed at both ends of the through hole; and two elastic boots that pass through a hollow part of the bush and are screwed onto the fixing member. A floating caliper type disc brake comprising a bolt that clamps a brake between a head of the bolt and the fixing member.