JPH0417872Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a disc brake that is suitably used to apply braking force to a vehicle, etc., and in particular, the invention relates to a disc brake that is suitably used to apply braking force to a vehicle, etc. Regarding disc brakes that can be protected from heat.

[Prior art]

3 and 4 show prior art disc brakes.

In the figure, 1 is a disk, 2 is the disk 1
One side shows a mounting bracket provided on a non-rotating part of the vehicle, and the mounting bracket 2 has a pair of arms spaced apart in the circumferential direction of the disc 1 and extending in the axial direction so as to straddle the outer periphery of the disc 1. Part 2A, 2A
is provided, and each arm portion 2A is provided with a caliper 3 to be described later.
The outer leg portions 3C are connected to each other at their distal ends by a connecting portion 2B extending outside. As shown in FIG. 4, the intermediate lower surface side of each arm portion 2A becomes a disk path portion 2C under which the disk 1 passes, and the disk path portion 2C has a concave curved surface portion _2C1 . It is formed by a flat surface portion _2C2 . Further, a bottomed pin hole 2D extending in the axial direction of the disk 1 is formed in each arm portion 2A, and a pin 5, which will be described later, is slidably inserted into the pin hole 2D.

Reference numeral 3 indicates a caliper slidably supported by the mounting bracket 2. The caliper 3 is disposed on one side of the disk 1, and includes an inner leg portion 3A in which a cylinder (not shown) is formed; It extends from the inner leg portion 3A to the other side of the disk 1 via the bridge portion 3B, and connects the disk 1 with the inner leg portion 3A.
Outer leg portion 3C formed to straddle both sides of
and mounting parts 3D, which extend from both ends of the inner leg part 3A to the left and right, respectively. (only one of which is shown in Figure 4) is fixed. Each pin 5 is slidably inserted into each pin hole 2D via a rubber bush 6, etc., and the caliper 3 is slidably inserted into each arm 2A of the mounting bracket 2 in the axial direction of the disk 1. It's starting to be supported. Note that the caliper 3 is omitted in FIG. 4.

Reference numerals 7 and 7 indicate rubber protective boots that protect the outer circumferential surface of each pin 5 from rainwater, etc., and each protective boot 7 is formed integrally with or separately from the rubber bushing 6, and is attached to each mounting portion 3D of the caliper 3. and each arm portion 2A of the mounting bracket 2. Reference numeral 8 indicates a piston (however, only the tip side is shown in FIG. 3) that is slidably inserted into the cylinder of the inner leg portion 3A, and the piston 8 is inserted into the master cylinder (not shown) during brake operation. When hydraulic pressure is supplied from the inner leg 3A, the outer leg 3C
Friction pads 9, which will be described later, are pressed against both surfaces of the disc 1 between the discs 1 and 1 to provide a braking action.

Reference numerals 9 and 9 indicate friction pads arranged on both sides of the disk 1, and the back metal 10 of each friction pad 9 has tabs 10A and 10A on both left and right ends, respectively, as shown in FIG. provided, each ear portion 10A
are slidably supported in the axial direction of the disk 1 by pad springs 11, which will be described later. Each of the friction pads 9 is pressed against both sides of the disc 1 by the caliper 3 via the piston 8 and the outer leg 3C, and by strongly gripping the disc 1, applies braking force to the disc 1. It's getting old.

Reference numerals 11 and 11 indicate pad springs as sliding guide plates attached to each arm portion 2A of the mounting bracket 2 in order to slidably support each friction pad 9, and each pad spring 11 has a spring property. The pads are formed by press-molding a stainless steel plate or the like having A pair of supporting arms 11
A, 11A, and each ear portion 1 on each support arm portion 11A.
a pad presser 11B that presses 0A from above;
A claw portion 11C is located between each support arm portion 11A, extends halfway through the curved surface portion _2C1 of the disk path portion 2C, and prevents the pad spring ₁₁ from coming off by engaging with the curved surface portion 2C1. It is roughly composed of.

The disc brake according to the prior art has the above-mentioned configuration, and when hydraulic pressure is supplied from the master cylinder to the cylinder of the caliper 3 by brake operation, the piston 8 slides in this cylinder to one disc. , the respective friction pads 9 are pressed against both sides of the disk 1 between the outer legs 3C and the outer legs 3C. Each friction pad 9 corresponds to each lug 10 of the back metal 10.
A is each support arm portion 11A of each pad spring 11
By sliding in the axial direction of the disk 1 between the pad holding portion 11B and the pad holding portion 11B, the disk 1 is brought into strong frictional contact with both surfaces of the disk 1, converting the rotational energy of the disk 1 into thermal energy, and Gives braking force to 1. At this time, the disk 1 is placed in a high temperature state and begins to radiate heat to the surroundings.

(Problems to be Solved by the Invention) In the above-mentioned conventional technology, the disk path portions 2C formed on the lower surface side of each arm portion 2A of the mounting bracket 2 are disposed close to the outer peripheral surface of the disk 1. Since the pin 5 is inserted into the pin hole 2D of each arm portion 2A via the rubber bush 6, the heat dissipated from the disk 1 during braking causes each arm portion 2A to
There is also a drawback that the rubber bushing 6 and the like are exposed to a high temperature condition via the disk path portion 2C, and the rubber bushing 6 and the like deteriorate quickly. Furthermore, the protective boots 7 disposed between the respective arm portions 2A and the respective attachment portions 3D of the caliper 3 also deteriorate quickly due to the heat generated at this time.

The present invention was developed in view of the above-mentioned drawbacks of the prior art, and can protect the inside of the pin hole provided in the arm of the mounting bracket from the heat of the disk.
To provide a disc brake capable of preventing early deterioration of rubber bushings, protective boots, etc.

[Means for solving problems]

The feature of the configuration adopted by the present invention in order to solve the above-mentioned problems is that the sliding guide plate is located between the disk and the disk path portion of the mounting bracket and covers the entire disk path portion. A heat shield part is integrally formed extending in the circumferential direction of the disk and has a free end on the distal end side, and the disc path part of the mounting bracket is engaged with the proximal end side of the heat shield part, and the heat shield part The diameter of the disk is adjusted so as to form a gap between the engaging portion that prevents the sliding guide plate from coming off and the heat shielding portion, which is located closer to the tip of the heat shielding portion than the engaging portion. The reason is that a notch section cut out in the direction is provided.

[Effect]

With the above configuration, the heat shielding part integrally formed on the sliding guide plate can cover almost the entire disc path part of the mounting bracket, and the heat dissipated from the disc during braking etc. is transferred to the arm part of the mounting bracket. Direct transmission can be prevented. In addition, a gap is formed between the notch of the disk path part and the heat shielding part, and the tip side of the heat shielding part is a free end, so the tip side of the heat shielding part can be used as a heat dissipation fin. It can be used to expand the heat dissipation area.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. In the embodiment, the same components as those of the prior art shown in FIGS. 3 and 4 are given the same reference numerals, and their explanations will be omitted. Also, in FIG. 1, the caliper 3 is omitted as in FIG. 4.

In the figure, reference numeral 20 indicates a mounting bracket, and the mounting bracket 20 is formed almost in the same manner as the mounting bracket 2 described in the prior art section, and each arm portion 20A extends in the axial direction so as to straddle the outer periphery of the disk 1. A disk path portion 20C, through which the disk 1 passes below, is provided on the intermediate lower surface side, and a bottomed pin hole 20D is formed in the arm portion 20A. However, the disk path portion 20C includes a curved surface portion 20C ₁ as an engaging portion, a flat surface portion 20C ₂ , and a relief cut out in a concave curved shape from the middle of the curved surface portion 20C ₁ to the end of the flat surface portion 20C ₂ . The relief groove 20C ₃ and the flat surface 2 are formed from the groove 20C ₃ .
_0C2 constitutes a notch cut out in the radial direction of the disk 1, and a gap S is interposed between it and a heat shielding part 21C of a pad spring 21, which will be described later.

21 is for slidably supporting the friction pad 9;
A pad spring is shown as a sliding guide plate attached to the arm portion 20A of the mounting bracket 20, and the pad spring 21 is formed by press-forming a stainless steel plate or the like having spring properties.
A pair of support arms 21A, 21A are spaced apart from each other in the axial direction of the disk 1 and have a substantially L-shaped cross section to slidably support the ears 10A of each friction pad 9.
, a pad holding part 21B that presses each ear part 10A from above onto each support arm part 21A, and a pad holding part 21B that is located between each support arm part 21A and bent toward the disk path part 20C side of the mounting bracket 20, A heat shielding portion 21C extends to the tip side of the flat surface portion _20C2 so as to cover substantially the entire area of the disk path portion 20C.
It is roughly composed of.

Here, the heat shield section 21C is the disk path section 20.
A curved claw portion 21C ₁ bent so as to come into contact with the curved surface portion 20C ₁ of C from below, and the curved claw portion 2
Located on the tip side of 1C ₁ , the disk pass section 20
It is bent almost parallel to the flat surface part 20C ₂ of C,
The curved claw part 21C ₁ engages with the curved surface part 20C ₁ of the disk path part _20C to release the pad spring 2.
1 is designed to prevent it from coming off. Further, the curved claw portion 21C ₁ and the extension portion 21C ₂ of the heat shield portion 21C form a gap S with the relief groove portion 20C ₃ and the flat surface portion 20C ₂ of the disk path portion 20C, respectively,
The heat dissipation area has been expanded. In addition, in FIGS. 1 and 2, one of the pad springs 21
A similar pad spring is also attached to the other arm portion 20A (not shown) of the mounting bracket 20, although only one is shown in the figure.

The disc brake according to this embodiment has the above-described configuration, and its basic operation is not particularly different from that of the prior art.

However, in this embodiment, a relief groove portion 20C 3 is formed in the disk path portion 20C of the mounting bracket 20 between the curved surface portion 20C ₁ and the flat surface portion 20C ₂ , and the pad spring 21 has a relief groove portion 20C ₃ located between the curved surface portion 20C 1 and the flat surface portion 20C 2 .
The curved claw portion 21C ₁ extends to the tip side of the flat surface portion 20C ₂ so as to cover the disk path portion 20C.
Since the heat shielding part 21C that engages with the curved surface part 20C1 of the pad spring ₂₁ is integrally formed, the heat dissipated from the disc 1 during braking etc. is prevented from being transmitted to the arm part 20A of the mounting bracket 20. Heat shield part 2
1C, and the rubber bushing 6 etc. inside the pin hole 20D can be protected from the heat of the disk 1.

That is, the heat radiated from the disk 1 is transferred to the heat shielding part 21C of the pad spring 21, but this heat is transferred from the heat shield part 21C to the entire support arm part 21A of the pad spring 21, the pad pressing part 21B, etc. The pad spring 21 conducts and radiates outward from the entire surface of the pad spring 21 to the arm portion 20 of the mounting bracket 20.
The heat transferred to A can be significantly reduced.

Further, the curved claw portion 21C ₁ and the extension portion 21C ₂ of the heat shield portion 21C are the relief groove portion 2 of the disk path portion 21C.
1C ₃ and the flat surface portion 21C ₂ to form a gap S,
Since the heat dissipation area is expanded, the heat transferred to the arm portion 20A by this gap S can be significantly reduced, and the tip side of the curved claw portion 21C ₁ and the extension portion 21C ₂ are designed to dissipate heat. It acts as a (cooling) fin and can prevent the arm portion 20A and the like from being exposed to high temperatures.

Therefore, according to this embodiment, the inside of the piston hole 20D of the arm portion 20A, etc. can be reliably protected from the heat of the disk 1 by the heat shielding portion 21C of the pad spring 21, etc., and the rubber bushing 6, the protective boot 7, etc. can prevent premature deterioration.

In the above embodiment, the pin 5 is inserted into the pin hole 20D of the mounting bracket 20 through the rubber bushing 6, but the present invention is not limited to this, and it is also possible to inject grease or the like into the pin hole 20D. Even when inserting the pin 5 with a holder, the grease can be prevented from deteriorating prematurely.

(Effects of the invention) As detailed above, according to the invention, the heat shield part extends in the circumferential direction of the disk so as to cover the entire disk path part of the mounting bracket and has a free end on the tip side. It is formed integrally with the moving guide plate, and the disc path part of the mounting bracket has a space between it and the heat shielding part on the distal end side of the engaging part, so that the heat is dissipated from the disc during braking, etc. This effectively blocks the heat from being transmitted to the arms of the mounting bracket, protects the rubber bushings and grease in the pin holes from the heat of the disk, and reliably prevents them from deteriorating early. In addition, the heat radiation area can be greatly expanded by making the tip end side of the heat shield part act as a heat radiation fin, and the heat from the disk can be radiated to the outside from the surface of the heat shield part, etc., thereby reliably improving the cooling effect.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention,
Fig. 1 is a half-sectional view of the disc brake, Fig. 2 is a perspective view of the pad spring, Figs. 3 and 4 show the prior art, Fig. 3 is a plan view of the disc brake, and Fig. 4 is a 3 is a sectional view taken in the direction of the - arrow in FIG. 3. FIG. 1...Disk, 3...Caliper, 5...Pin, 6...Rubber bushing, 9...Friction pad, 20
...Mounting bracket, 20A...Arm, 20C...
...Disc pass section, 20D...Pin hole, 21...
Padded spring sliding guide plate, 21C...Heat shield part.

Claims (1)

[Scope of utility model registration request] a mounting bracket having an arm portion extending in the axial direction so as to straddle the outer periphery of the disk, a disk path portion through which the disk passes formed in the arm portion, and a pin hole formed inside the mounting bracket; A caliper is slidably supported by the mounting bracket via a pin slidably inserted into a pin hole of the mounting bracket, and a caliper is disposed on both sides of the disk and presses both sides of the disk with the caliper. A disc brake comprising a pair of friction pads and a sliding guide plate attached to an arm of the mounting bracket to slidably support each friction pad, the sliding guide plate including: A heat shielding portion is integrally formed, extending in the circumferential direction of the disk and having a free end on the distal end side, so as to be located between the disk and the disk path portion of the mounting bracket so as to cover the entire area of the disk path portion. and the disk path portion of the mounting bracket is engaged with the proximal end side of the heat shielding portion,
An engaging portion for preventing the sliding guide plate from coming out, and a space between the engaging portion and the heat shielding portion, which is located on the distal end side of the heat shielding portion from the engaging portion. A disc brake characterized by having a notch cut out in the radial direction.