JP2571526Y2 - Disc brake - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc brake mounted on an automobile or the like.

[0002]

2. Description of the Related Art In recent years, there has been a strong demand for improving the fuel consumption rate (fuel efficiency) when an automobile runs. Therefore, various measures have been taken to improve fuel efficiency, such as improvement in power performance by improving the engine and reduction in running resistance by improving the body shape. In addition, reducing the acceleration resistance of an automobile during acceleration also greatly contributes to the improvement of fuel efficiency. Therefore, the weight of a vehicle that directly affects the acceleration resistance has been reduced. In view of the above, there has conventionally been a method of reducing the weight of a disc brake attached to an automobile as one of the methods for reducing the weight of a vehicle. A conventional example of a disc brake with reduced weight will be described with reference to the example shown in FIG.

In the figures, reference numeral 1 denotes a caliper (two-piece caliper). The caliper 1 includes a claw caliper section 2 and a cylinder bore caliper section 3, and the claw caliper section 2 and the cylinder bore caliper section 3 are connected by a plurality of tie bolts 4, 4,. The cylinder bore caliper 3 of the caliper 1 has a brake pad 6 on one side Da of the disc plate D.
One cylinder 12 is formed in which a piston 11 opposing via a is slidably fitted. The claw caliper portion 2 of the caliper 1 is formed at its tip with a claw portion (not shown) that opposes the other side surface Db of the disc plate D via the brake pad 6b. here,
Since the caliper 1 includes the claw caliper portion 2 and the cylinder bore caliper portion 3, the claw caliper portion 2 and the cylinder bore caliper portion 3 can be manufactured separately. In addition, there is no need to escape the cutting tool for forming the cylinder 12 to the cylinder bore caliper portion 3, and a plurality of claw portions can be formed in the claw caliper portion 2. The caliper 1 thus configured is slidably supported by a carrier (vehicle fixing member) 5 at a position across the disk plate D via slide pins 8 and 8 in a direction crossing the disk plate D. ing. Further, between the caliper 1 or the slide pins 8 fixed to the caliper 1 side and the periphery of a slide hole (not shown) of the carrier 5 into which the slide pins 8 are slidably inserted. And pin boots 15 made of rubber or the like for preventing water or mud from entering the sliding portion. According to the disk brake having the above structure, when brake oil is supplied from a master cylinder (not shown) connected to the pipe section 9, the piston 11 in the cylinder bore caliper section 3 moves in the direction of the disk plate D. Thus, the brake pad 6a between the piston 11 and the disk plate D is pressed against one side surface Da of the disk plate D. As a result, the entire caliper 1 slides in the direction of arrow A in the figure, and the brake pad 6b is pressed against the other side surface Db of the disk plate D by the claw portion formed on the claw caliper portion 2, so that the disk plate D 6a and 6b hold and brake. According to the above disk brake, the caliper 1 is composed of two members, the claw caliper 2 and the cylinder bore caliper 3.
Since it is a piece type caliper, a highly rigid material such as iron can be used for the claw caliper portion 2 and a lightweight material such as aluminum can be used for the cylinder bore caliper portion 3. Therefore, the weight of the entire disc brake can be reduced without lowering the rigidity of the claw caliper portion 2.

[0004]

By the way, when the brake is operated frequently, the cylinder bore caliper portion 3 is generated by the frictional heat between the disk plate D and the brake pads 6a and 6b.
There is a possibility that a so-called vapor lock phenomenon may occur in which the braking force is reduced due to the generation of air bubbles in the brake oil supplied to the vehicle. For this reason, it is necessary to suppress the heat generation of the cylinder bore caliper portion 3 to which the brake oil is supplied. However, in the above-described conventional disk brake, the frictional heat between the brake pad 6b and the disk plate D is transmitted to the claw caliper 2, and the cylinder bore The cylinder bore caliper 3 may be transmitted to the caliper 3 and become hot. Also,
When the brake is activated, the disc plate D and the brake pads 6a,
6b, or a pin boot 15 provided at a sliding position between the slide pins 8, 8 and the caliper 1 due to a collision of a stone or the like scattered when the vehicle travels.
However, there is a risk that water, mud and the like may enter the sliding portion and cause the sliding portion to rust.

The present invention has been made in view of the above circumstances, and provides a disc brake which does not cause a malfunction in brake operation, prevents burnout and damage of a pin boot, and is lightweight. It is an object.

[0006]

The disc brake of the present invention comprises a two-piece caliper comprising a cylinder bore caliper portion and a claw caliper portion, and a slide pin which slides the two-piece caliper in a direction intersecting the disc plate. And a pin boot that seals a sliding point between the slide pin and the caliper or the vehicle fixing member. Before
Between the cylinder bore caliper and the claw caliper
A holding portion to be held and integrally formed on both sides of the holding portion.
And is exposed to the outside so as to cover the pin boot.
A heat insulating material comprising a protection unit is provided .

[0007]

According to the disc brake of the present invention, since the heat insulating material is interposed between the cylinder bore caliper and the claw caliper, it is difficult to transfer the heat of the claw caliper to the cylinder bore caliper. Therefore, the temperature of the brake oil supplied to the cylinder bore caliper can be prevented from becoming high, and the possibility of the occurrence of a vapor lock phenomenon or the like can be eliminated. In addition, since the periphery of the pin boot that seals the sliding portion between the slide pin and the caliper or the vehicle fixing member is covered and protected by the curved protective portion of the heat insulating material, the disc plate and the brake pad are activated when the brake is operated. Thus, the pin boot can be prevented from being burned or damaged due to a spark generated between the pin boot and a collision of a stone scattered when the vehicle travels, and a highly reliable disc brake can be obtained. Also simply
Pad spring and detent near the piston boot
The member was used as a protective cover to protect the piston boot.
Number of parts in disc brake integrated with protective part
Is not just a matter of reducing cylinder bore carry.
Fix the heat insulating material provided between the pallet and the claw caliper
Integrated with the protection part that protects the boot
In addition to reducing the number of parts, do not increase the thickness of insulation.
The heat storage capacity of the insulation itself can be increased, and it is exposed to the outside
The area of the heat insulating material that is exposed to the outside air increases.
To increase the area of the heat dissipating part relative to the heat receiving part of the insulation
Can improve the heat storage / cooling effect of the heat insulating material,
For this type of two-piece caliper disc brake
And cylinder bores due to heat transfer from the claw caliper
Effectively suppresses the heat generated by the
I can go up.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A disc brake according to an embodiment of the present invention will be described below with reference to FIGS. The same components as those of the conventional example are denoted by the same reference numerals, and description thereof is omitted. As shown in the figure, in the disc brake of this embodiment, a heat insulating material 21 is sandwiched between a cylinder bore caliper 3 and a claw caliper 2. As shown in FIG. 4, the heat insulating material 21 is composed of a holding portion 21a formed in a plate shape and protection portions 21b, 21b formed on both sides of the holding portion 21a. In addition, the holding portion 21 of the heat insulating material 21
a are formed in the a, and the cylinder bore caliper portion 3 and the claw caliper portion 2 are connected to the tie bolts 4, 4.
Tie bolts 4, 4,... Are inserted into the holes 22, 22,. Also,
The protection portions 21b, 21b of the heat insulating material 21 are formed in a curved shape so as to cover the outer peripheries of the pin boots 15, 15 when the holding portion 21a is held between the cylinder bore caliper portion 3 and the claw caliper portion 2. Have been. Here, the heat insulating material 21 can be obtained, for example, by impregnating a synthetic resin into a heat insulating fiber material such as ceramic and heating and pressing.

According to the disk brake having the above structure, the heat from the claw caliper 2 is transferred to the cylinder bore caliper 2 because the heat insulating material 21 is interposed between the cylinder bore caliper 3 and the claw caliper 2. The disc brake can be made harder to transmit to the cylinder bore 3, and the temperature of the brake oil supplied to the cylinder bore caliper section 3 can be prevented from becoming high, and the possibility of the occurrence of a vapor lock phenomenon or the like can be eliminated. It can be.
In addition, sliding between the caliper 1 or the slide pins 8 fixed to the caliper 1 side and the periphery of a sliding hole (not shown) of the carrier 5 into which the slide pins 8, 8 are slidably inserted. Protective portion 2 in which the periphery of pin boots 15, 15 for sealing the moving parts is formed of a heat insulating material 21 in a curved shape, respectively.
1b, 21b, the pin boots 15, 15 are caused by a spark generated between the disk plate D and the brake pads 6a, 6b when the brake is actuated, or a collision of a stone scattered when the vehicle is running. Burn and damage can be prevented. Therefore, the slide pins 8,
8 can be further protected, and a highly reliable and lightweight disc brake can be obtained.

[0010] Further , the piston boots 15 and 15
Remove the pad spring and detent member from
Protective part 2 serving as a protective cover for protecting the members 15
1b and the number of parts in the disc brake
It is not just a reduction, but a cylinder bore caliper
Heat insulating material 21 provided between the portion 3 and the claw caliper portion 2
One with the protection part 21b for protecting the piston boots 15, 15
In addition to reducing the number of parts,
Heat storage capacity of the heat insulating material 21 itself without increasing the thickness of the material 21
The part that can increase the product and is exposed to the outside air
Increase of the area of the heat insulating material 21 by
It is possible to increase the area of the heat radiation part with respect to the heat reception part
Therefore, the heat storage / cooling effect of the heat insulating material 21 is improved, and this kind of
Claws on disc brakes of two-piece calipers
Cylinder bore caliper by heat transfer from caliper part 2
Effectively suppresses heat generation in part 3 and improves braking performance itself
I can do it. In the disc brake of the above embodiment, the slide pins 8, 8 provided on the caliper 1 side
The disc brake has a structure in which slide pins 8 and 8 are provided on the carrier 5 side and are slidably inserted into the slide holes formed on the caliper 1 side. It may be of a type that is inserted through. in this case,
The outer peripheries of the pin boots 15, 15 provided between the carrier 5 or the slide pins 8, 8 and the outer peripheries of the sliding holes of the caliper 1 are covered and protected by the protection portions 21b, 21b of the heat insulating material 21. In addition, the material of the heat insulating material 21 in the above embodiment is not limited to the embodiment as long as it has heat insulation properties and high mechanical strength.

[0011]

As described above, according to the disc brake of the present invention, the following effects can be obtained.

Since the heat insulating material is interposed between the cylinder caliper and the claw caliper, the heat of the claw caliper can be hardly transmitted to the cylinder bore caliper. The temperature of the brake oil supplied to the vehicle can be prevented from increasing, and the possibility of the occurrence of a vapor lock phenomenon or the like can be eliminated.

[0013] Further, since the periphery of the pin boot provided at the sliding portion between the slide pin and the caliper or the vehicle fixing member is covered and protected by the curved protective portion of the heat insulating material, the disk is activated when the brake is actuated. It is possible to prevent burning and damage of pin boots due to sparks generated between the plate and the brake pad or collision of stones scattered during running of the vehicle, etc. can do. Also, simply
Pad springs and detents near ston boots
Material is protected by a protective cover that protects the piston boot.
And the number of parts in the disc brake
It is not just a reduction, but a cylinder bore caliper
Insulation material provided between the part and the claw caliper part
By integrating with the protection part that protects the boot,
Without reducing the number of points, without increasing the thickness of the insulation
The heat storage capacity of the insulation itself can be increased, and
The area of heat insulation in the area where
Increase the area of the heat dissipating part with respect to the heat receiving part of the heat insulating material.
The heat storage and cooling effects of the heat insulating material are improved,
Disc brake smell of two-piece caliper
The cylinder bore cap due to heat transfer from the claw caliper.
Effectively suppresses heat generation at the lipper, improving braking performance itself
Can be achieved.

[Brief description of the drawings]

FIG. 1 is a plan view of a disc brake according to an embodiment of the present invention.

FIG. 2 is a front view of the disc brake of the embodiment.

FIG. 3 is a side sectional view of the disc brake of the embodiment.

FIG. 4 is a perspective view illustrating the shape of a heat insulating material according to an embodiment.

FIG. 5 is a plan view of a conventional disc brake.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 2-piece caliper 2 Cylinder bore caliper part 3 Claw caliper part 5 Carrier (vehicle fixing member) 8 Slide pin 15 Pin boot 21 Insulation material 21b Protective part

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16D 55/224 104 F16D 65/02

Claims (1)

(57) [Scope of request for utility model registration] 1. A two-piece caliper comprising a cylinder bore caliper portion and a claw caliper portion, and said two-piece caliper is slidable via a slide pin in a direction intersecting the disc plate and said disc plate. A vehicle fixing member that supports the position across the vehicle, and a disc boot that includes a slide boot and a pin boot that seals a sliding portion between the slide pin and the caliper or the vehicle fixing member, wherein the cylinder bore caliper portion and the claw caliper portion
Between the holding portion and the both sides of the holding portion.
Formed and exposed to the outside to cover the pin boot
A disc brake characterized by being provided with a heat insulating material comprising a protected portion .