JPS58203235A - Disc brake equipment - Google Patents

Abstract

PURPOSE:To improve braking force by enlarging the area, in the circumferential direction of a disc, of a pad which is pressed by a piston and to restrain vibration of the pad for prevention of brake squeek by applying a uniform pressure to the approximately entire area of the pad. CONSTITUTION:The section of the opening of a cylinder 11 shows that its both upper and lower sides 11a are parallel to a line L2 and have equal distances from it while the line L2 crosses a line L1 perpendicular at the center O of a piston, whereby the line L1 connects the piston center O to the axial center of a disc. Both left and right sides 11b are semicircular. The piston 10 shows a cup- like shape which is the same as that of the cylinder 11, and is slidably fit therein in the direction of the axis of the disc. At braking, the piston 10 presses the pad 6 widely in the circumferential direction of the disc from end to end thereof, hence restricting vibration of the pad 6 effectively.

Description

[Detailed Description of the Invention] The present invention includes at least one piece of a caliper! lVcRegarding a disc brake device having a single cylinder and equipped with a piston, the area of compression of the pad in the disc circumferential direction by the piston is effectively increased in a particularly limited space, and the effective diameter of the disc is increased. The present invention relates to a disc brake device.

As is well known, there are two types of disc brake devices: one is a piston-opposed caliper in which both IK pistons are arranged on a disk that rotates integrally with the wheel, and the other is a floating or sliding caliper in which one piston is arranged.

In these disc brake devices, for example, as shown in Japanese Patent Publication No. 28-3260, a caliper piece @IK2 (a) or three circular cylinders are arranged, a piston of 1 feJ is inserted into each, and the caliper is Some are equipped with multiple ■Pad pressing means.

In the case where multiple cylinders are provided on one side of the disk, and pistons inserted into each cylinder press the pad against the disk, the pushing force of the pistons across the entire pad area is lower than when a single circular cylinder is provided. works, and the effective diameter of the disc becomes larger, which has the advantage of increasing braking force even with the same hydraulic pressure. However, compared to the case where a single cylinder and two pistons are inserted, due to the force, consideration must be given to the positioning of the hydraulic pressure inlet from the mask cylinder and the ease of air bleeding, and furthermore, the operation of each piston must be considered. Temporal variations occur.

Therefore, for the purpose of the present invention, in a disc brake device having a cylinder of at least 4N- on one side of the caliper and equipped with a piston, the suppression in the circumferential direction of the disc that presses the piston crab pad is provided. By effectively increasing the area and enlarging the effective diameter of the V-disk, it effectively increases the braking force, and also works to press almost the entire area of the pad with an average force, suppressing pad vibration. To provide a disc brake device that prevents the occurrence of brake squeal, eliminates the dead space L4e between cylinders of a plurality of cylinders, effectively uses the cylinder area, and reduces the size of the caliper.In accordance with the above-mentioned objects, the present invention includes In the disc brake system @, which is equipped with a single cylinder trap piston housed in the operating part of the caliper, this piston is pushed by the pressure action #IJJ, and brakes are applied by pressing against the disc that rotates integrally with the pad shaft. One surface of the cylinder opening is shaped longer in the disk circumferential direction than in the disk radial direction, and this cylinder Vc
The pad is characterized by a large pressing area of the pad in the disk circumferential direction by the slidably fitted piston.

The present invention is applied to a disc brake device of a piston facing type caliper in which pistons are arranged on both sides of the disc, or a floating or sliding type caliper in which a piston is arranged on one side. The IJ pad straddles the disk from its outer periphery, or for example,
As shown in the No. 691 patent, an annular disk is provided with the outer periphery fixed to a disk fixed to an axle, and a caliper straddles this disk from the inner periphery.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

First, the embodiment shown in FIGS. 1 to 3 will be described. A disc 1 is provided on an axle so that it can rotate together with a wheel, and a caliper 2 straddles the disc 1 from the outer periphery. A bracket 3 fixed to the caliper 2 near one side of the disc 10 (a pair of support poles screwed in the axial direction of the disc) 4 is slidably provided via a sleeve 5, and is movable in the axial direction of the disc. It becomes.

Then, on both sides of the disk l [U pads 6.7 are arranged,
These back plates 6at7a'Th are inserted into hanger bins 8 and 9 provided on the caliper 2, and are suspended so as to be movable in the disk axial direction. Caliper 2 is this pad 6.7
and the bridge portion 2a spanning the disk 1, and the disk 1.
an actuating part 2b having a single cylinder 11 housing a piston 10 disposed on the -@ side and pushing the pad 6; and a reaction piece 2C disposed on the other side of the disk 1 pushing the pad 7.
It is separated from the reaction part 2d having a. The cylinder 1lr1 actuating portion 2b is formed so that its opening cross section is longer in the disk circumferential direction r0]VC than in the disk radial direction.

In this embodiment, as shown in FIG.
In the cross section of the opening, both the upper and lower sides 11a.

Is 11a the middle L of the piston? They are parallel to the line Lx, which is perpendicular to the line connecting O and the disk axis, and are equally spaced from each other at the piston center 0. and both left and right sides 110′”
b#'''Half P'J & h v r v=,, color? The piston IO has a tip shape and is formed in the same shape as the cylinder 11, and is fitted into the cylinder 11 so as to be slidable in the disk axial direction. This open end is similar to the cylinder 11 shown in FIG.
a is parallel to the line that is perpendicular to the piston center 0 to 'mL1 connecting the piston center O and the disk axis,
In addition, the left and right end portions 10b and 10bU have a semicircular shape. As a result, the opening end comes into contact with the back plate 6a of the pad 6 over the vicinity of its periphery. Therefore, during braking, the piston 101't pad 6 is pressed to both ends along its long width in the circumferential direction of the disk, which effectively suppresses the vibration of the pad 6. Also, compared to a single circular cylinder,
The effective diameter Ri of the disk 1 can be set to the widest value, effectively increasing the braking force and reducing the size of the caliper 2.

The clearance between the disc 1 and the pads 6.7 arranged on both sides of the disc 1 is kept constant by using the deformation action of a single piston seal 12, and the dust seal 13 maintains a constant clearance between the cylinder 11 and the piston 10. This prevents dirt from entering between them.

Next, to explain the operation of this embodiment, the hydraulic fluid hole (
When hydraulic pressure (not shown) is applied within the cylinder 11, the piston 10 moves forward while deforming the piston seal 12 and pushes the pad 6 of the actuating portion 2b@. The f'L [F pad 6 is frictionally engaged with the disc 1, and the caliper 2 moves in the opposite direction to the operating direction of the piston 10 due to the reaction force caused by this pressure contact. At this time, the reaction force piece 2C of the reaction part 2d
pushes the back plate 7a of the pad 7 and frictionally engages with the opposite side of the disc 1, thereby performing a braking action.

During this braking, the single piston 10 slidably fitted into the cylinder 11 has its open end connected to the back plate 6 of the pad 6.
Because the pressure is applied to the area near the periphery of the disk for a longer time in the circumferential direction of the disk than in the radial direction of the disk, the effective diameter R of the disk can be set to the maximum value without increasing the number of pistons. Compared to the above, the caliper 2' can be made smaller and the braking force can be effectively improved.

In addition, since the open end of the piston 10 presses almost the entire area of the pad back plate 6a up to both ends in the disc circumferential direction, the vibration of the pad 6 is effectively suppressed, and in turn, the brake squeal caused by this vibration is also suppressed. Yes, and piston seal 12
Since there is a single value, rollback variations due to seal variations that may occur in multiple pistons can be similarly suppressed. Upper and lower ends 10 a of the open end of the piston 10
+ 10 a f, respectively, are formed vertically at equal intervals on the circumference of the disk effective diameter R, and are formed parallel to this in the circumferential direction of the disk. Upper and lower ends 10a, l of the open end of the piston 10
oa'i A line connecting the piston center O and the disk axis,
It is bent outward at points A and Brc, respectively, where it intersects with Brc.

The cylinders housing the piston 10 shown in these embodiments each have a similar shape to the piston 10, and the opening cross section is longer in the disk circumferential direction than in the disk radial direction.

Furthermore, the cylinder 11 is not limited to the cases shown in these embodiments, but may have a shape in which two circular cylinders are connected, three circular cylinders in parallel, or three cylinders connected in parallel. They may be arranged in the circumferential direction of the disk with the center of the effective diameter Ri of the disk 1 and connected to each other.

Further, in each of the above embodiments, the open end of the tip-shaped piston 10 is brought into contact with the pad back plate 6a, but the piston 10 is inverted and fitted into the cylinder 11, and its closed end is connected to the pad back plate 6a. 61L [You may also connect ↓. In this case, there is an advantage that the surface pressure of the piston 6 when the pad is pressed is further reduced.

As described above, according to the present invention, at least one side of the caliper has a single cylinder, and the pressing area of the pad in the disk circumferential direction by the slidably fitted piston is greatly increased, so that the disk is effective. The diameter can be maximized, and compared to a conventional single circular cylinder equipped with a piston, the caliper can be made smaller and the braking force can be effectively improved. In addition, the piston acts to push almost the entire area of the pad back plate with an average force, effectively suppressing pad vibration during braking and suppressing brake squeal caused by this vibration. Moreover, since the piston is single, the piston seal is also single, which reduces temporal variations in the operation of the pistons that occur in multiple pistons. Furthermore, the caliper's cylinder area can be used effectively, eliminating the dead space that would occur between multiple cylinders, making the caliper even more compact, and since it is a single cylinder, liquid from the mask cylinder can be reduced. There is no need to determine the position of the pressure inlet or to create a communication path for each cylinder, making it easy to manufacture and also easy to bleed air as with a conventional single cylinder.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to a floating disc brake device.
The figure shows a sectional view taken from ■-■ in Fig. 1, and Fig. 3 shows a cross-sectional view taken from
FIG. 4 is a diagram illustrating the relationship between a disk, a pad, and a piston showing another embodiment; FIG. 5 is a diagram illustrating a relationship between a disk, a pad, and a piston showing another embodiment. 1 is the disc, 2 is the caliper, 2al” [bridge part,
2b is the actuating part, 2C is the counteracting part, 3 is the bracket, 6,
7 is a pad, 10 is a piston, and llri cylinder. Patent applicant: Honda Motor Co., Ltd. Procedural Amendments November 8, 1939, Mr. Kazuinu Wakasugi, Commissioner of the Japan Patent Office1, Indication of the case, Patent No. 85476, filed in 19852, Name of the invention: Disc brake device 3. Relationship between the person making the amendment and the case Patent applicant 4, agent 6, number of inventions increased by the amendment 7, subject of the amendment ・,: Brief explanation of drawings in the specification page 14 of the specification Correct "2CJ" in line 14 to "2d". That's all

Claims (1)

[Claims] L A disc brake device in which a piston is provided in a single cylinder formed in the operating part of the caliper, and the piston is pushed by hydraulic pressure, and the pad is pressed against a disc that rotates integrally with the axle for braking. The opening cross section is formed long in the radial direction of the disk and in the circumferential direction of the disk, and the cylinder is slidably fitted into the cylinder.
A disc brake device characterized by a pad having a large compression area in the disc circumferential direction.