JPS621467Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The disclosed technology belongs to the technical field of providing an effective braking hydraulic pressure compensation device in a caliper when one system of a disc brake system of a vehicle is defective.

Therefore, in this invention, a caliper mounted on a disc rotor and provided on a wheel hub has a cylinder that operates a piston linked to a brake pad attached to the disc rotor, and also has a cylinder that operates a piston that is linked to a brake pad attached to the disc rotor. This is an idea for a disc brake device that is equipped with a device that compensates the braking oil pressure even if one system is damaged.In particular, each union connected to both the front and rear systems from the master cylinder is connected to the control cylinder of the caliper. It is connected to both ends in a communicating state and has a cutoff valve at its tip, and the communication port in the control piston, which is slidably provided in the control cylinder, is selectively connected to the cutoff valve of the union. The control cylinder is made to be openable and sealable, and has a communication path that connects the front port and rear port of the master cylinder with each other. This invention relates to a disc brake device in which hydraulic pressure from the pistons acts in opposite directions, and shutoff valves at both ends of the control piston are designed to shut off the master cylinder and cylinder port when one of the pistons is missing.

<Prior Art> As is well known, automobiles have a brake system as a safety device, and recently, a system-controlled brake system that includes both front and rear systems has been widely used.

Furthermore, there are various types of braking devices, but disc brakes are used because of their advantages such as less fading during high-speed braking, and four-wheel disc brakes and the like are now being installed on actual vehicles.

<Problems to be Solved by the Invention> Incidentally, the front and rear hydraulic systems tend to loosen and deteriorate over time, and there is a potential for pipe damage to occur during regular and irregular inspections.

Therefore, unexpectedly, the front staff (rear type)
If one of these is damaged, braking will be performed only with the other, resulting in insufficient braking force and a longer braking distance.To counter this, it is necessary to increase the pedal force, and the structure is There were also some complications.

Therefore, when one of the brakes is defective, the advantages of the four-wheel, two-system disc brake, which originally had advantages, have been reduced, resulting in a disadvantage.

The purpose of this invention was to solve the technical problem of dealing with failure of one of the dual brake systems based on the conventional technology described above, and to provide control cylinders for both front and rear systems in the caliper of a disc brake device. By providing a compensation hydraulic system that allows at least one system to operate normally at all times, it is possible to maintain the operation of both systems even when one system is missing, and to maintain the same pedal force and braking distance, benefiting the field of safety technology application in the automobile industry. The object is to provide an excellent disc brake device.

<Means/effects for solving the problem> In line with the above-mentioned purpose, the structure of this invention, which is based on the scope of the above-mentioned utility model registration claim, is to solve the above-mentioned problem by providing front and rear parts from the master cylinder. When the two systems are normal, the control piston of the control cylinder installed in the caliper connects the hydraulic pressure from each union connected to both systems to the communication port installed inside the control cylinder, and passes it through the port to the cylinder and the piston. By pressing, the piston and caliper are relatively separated, and the pad is pressed against the disc rotor to apply braking. If one system is unexpectedly damaged, the oil pressure in the defective union becomes zero, so the differential pressure in the cylinder is reduced due to the oil pressure difference. The control piston slides toward the defective union through the union, and the end of the communication port is shut off by the cutoff valve attached to that union, and the hydraulic pressure from the other system is conducted from the cylinder to the port through the communication port. , a technical measure was taken to operate the piston with the cylinder so that the two systems would operate in the same way as when normal.

<Example> Next, an example of this invention will be described below based on the drawings.

In the embodiment shown in FIG. 1, reference numeral 1 denotes a disc brake device which constitutes the gist of the invention, and a floating type caliper 2 provided on a wheel hub (not shown) is mounted on a disc rotor 3. An outer pad 5 is disposed oppositely to the cylinder 6 via a back metal 4, and a piston 8 is fitted into the cylinder 6 via a seal 7 so as to be movable forward and backward.

An inner pad 10 is attached to the back plate 9 engaged with the piston 8 to the disc rotor 3.

Note that 11 is a bleeder plug.

The above configuration is substantially the same as the conventional configuration,
In this invention, a port 12 communicating with the cylinder 6 is connected to a pair of stepped control cylinders 14 and 14' of the front system and the rear system of a compensation hydraulic system 13 for one system failure provided at the end of the caliper 2. There is.

The control cylinders 14, 14' are connected to control pistons 16, 16' through seals 17 (not shown), 17', 18, 18' through which small-diameter communication ports 15, 15' serve as communication passages, respectively. The stepped portions 19 (not shown) and 19' connect the piston 16,
The stroke of 16' is restricted to restrict movement during operation.

The front passage 21 and rear passage 21' of the master cylinder 20 are connected to the unions 22 and 22' of the caliper 2, and the front port 23 and rear port 23' (not shown) of each union 22 and 22' are connected to the unions 22 and 22' of the caliper 2, respectively. It communicates with each control cylinder 14, 14', and at the tip of the union 22, 22' is a rubber seal 24, 2 as a shutoff valve that opens and closes the end of the communication port 15, 15' of each control piston 16, 16'.
4' is attached.

Weak disc springs 25, 25' are interposed between the unions 22, 22' and the control pistons 16, 16' to prevent the control pistons 16, 16' from being displaced due to vibrations, inclinations, etc. of the vehicle body.

It should be noted that the embodiment shown in FIG. 1 has a suffix in the code for convenience of illustration, but since the structures of the front system and rear system are substantially the same, it is assumed that there is no difficulty in identification.

In the above configuration, when the brake pedal force is applied to the master cylinder 20 from the time when the brake is not applied as shown in Fig. 1 with each port, cylinder, and passage being filled with hydraulic oil, both systems are normal. In some cases, the brake oil input to the unions 22, 22' passes through the ports 23, 23' and is biased by the weak disc springs 25, 25' at the stepped portions 19, 19' of the control cylinders 14, 14'. Communication ports 15, 1 of stopped control pistons 16, 16'
5' and from the control cylinders 14, 14' both enter the cylinder 6 through the port 12 and the piston 8.
The hydraulic pressure presses the piston 8, and the reaction force also pulls the caliper 2 in the direction of the arrow in the opposite direction.
Pads 5 and 10 are used to apply braking to the disc rotor 3.

If a defect occurs unexpectedly in the passage 21 of one system, for example, the front system, the oil pressure in the front system union 22 becomes zero.

Therefore, the hydraulic pressure of the rear union 22' presses the control piston 16', and since the communication port 15 has a small diameter, the front control piston 16 resists the weak disc spring 25 and presses the control piston 16'.
2 side, it comes into contact with the rubber seal 24, and the communication port 15 is immediately closed.

Therefore, the rear hydraulic pressure operates reliably in an extremely short period of time, enters the cylinder 6 through the port 12, presses the piston 8, and performs the normal braking action described above. This prevents the braking distance from becoming a long stroke.

Of course, even when the rear system is defective, the process operates substantially in the same way as the above process.

The control pistons 16, 16' during braking are stopped by stepped portions 19, 19' of the control cylinders 14, 14', and when inactive, disc springs 25, 25' prevent displacement due to vibration or inclination. Also, the leak is seal 1
7, 17', 18, 18'.

In addition, the embodiment shown in FIG. 2 is a disc brake device 1' in which one side of the system is defective in the compensating hydraulic device 1.
3' has substantially the same structure as the above-mentioned embodiment except that one stepped control piston 16'' is housed in one control cylinder 14'', and normally the pressure area of the control piston 16'' is Due to the difference, the control piston 16'' is pushed by the pressure on the front system passage 21 side.
The ultra-thin diameter communication port 15 is connected to the rear union 2.
The oil pressure in the front system passage 21 passes from the union 22 to the port 23 and is sealed by contacting the spherical protrusion 24 as a seal of the control piston 1.
It passes through the communication port 15'' with a small diameter of 6'', enters the cylinder 6 from the control cylinder 14'' through the port 12, presses the piston 8, is displaced relative to the caliper 2, and is applied to the disc rotor 3 by the pads 5 and 10. Provides braking action.

If a defect occurs unexpectedly in the front system passage 21, the internal pressure of the union 22 becomes zero, and the control piston 16'' is activated by the weak coil spring 25'' through a kind of choke action of the extremely small diameter communication port 15. It is pushed against the front side union 22, and the medium and small diameter communication port 15'' immediately comes into surface contact with the seal 24'', and the rear side hydraulic pressure is transferred to the port 15.
, port 15'', control cylinder 14'', port 1
2 into the cylinder 6 and causes the piston 8 to operate normally.

At this time, when the control piston 16'' moves toward the front side union 22 and the communication port 15'' is sealed by the seal 24'', there is a ring inside the control cylinder 14 with respect to the large diameter portion of the control piston 16''. The hook spring 19 of the stopper ring 19'' shown in FIGS. 3 and 4 elastically projects inwardly over the stepped portion of the control piston 16'' to maintain the posture of the control piston 16''. , the compensation function due to the loss of the front diameter passage 21 is fixedly maintained.

Of course, leakage of pressure oil to the front system side is prevented by seals 17'' and 18'', and seal 2
4″ also prevents this.

In addition, in the case of a defect on the rear side, the control piston 1 is
6'' is pressed against the rear union 22', and the communication port 15 comes into contact with the spherical protrusion 24 and is sealed, so its position remains unchanged and the brake fluid flows from the communication port 15'' to the control cylinder 1.
4'', enters the cylinder 6 via port 12 and actuates the piston 8.

Therefore, in this embodiment as well, even if either the front or the rear is defective, the disc brake device 1' maintains its braking function without changing from its normal state.

It goes without saying that the embodiment of this invention is not limited to the above-mentioned embodiments. For example, the disc brake device is not limited to the single piston type.
It is also applicable to the opposed piston type.
Further, various configurations can be adopted such as making the port from the union into an on-off valve type by passing it through an elastic seal.

<Effects of the invention> As described above, according to this invention, first of all, in all disc brakes installed in a vehicle, when normal, hydraulic pressure is applied to the caliper cylinders in both the front system and the rear system, and when one system is deficient. If this occurs, the differential pressure between the non-defective side and the normal side immediately activates and presses the piston, so braking is performed in the same way as in the normal state. An excellent effect is achieved in that the distance does not become long and, moreover, the wheel does not appear even in a locked state.

Thus, by connecting a dual system connecting union from the master cylinder to a control cylinder which communicates via a port with a piston operating cylinder provided in the caliper, and providing a control piston within the control cylinder with a communication port which connects to the front and rear sides of the master cylinder, the control piston can communicate pressurized oil from the communication port to the front and rear sides in the normal state, and on the other hand, in the event of a defect, it is moved to the defective side by the pressure difference, and the shut-off valve provided in the union immediately closes the port on the defective side to the master cylinder, allowing the piston to operate using the oil pressure when there is no defect, providing the excellent effect of

In addition, since the communication passage provided in the control piston can be made small in diameter, it is not only possible to immediately move the control piston when one side is missing, but also has the effect of preventing pressure oil leaks. .

Furthermore, since the compensation hydraulic system for one system failure is installed inside the caliper, it can be made more durable.
It also has the effect of being easy to assemble and maintain.

[Brief explanation of the drawing]

The drawings show embodiments of this invention; FIG. 1 is a schematic partial cross-sectional view of one embodiment, FIG. 2 is a schematic partial cross-sectional view of another embodiment, and FIG. 3 is a plan view of the stopper ring. FIG. 4 is a sectional view of FIG. 3. 3...disc rotor, 5,10...pad,
8... Piston, 2... Caliper, 6... Cylinder, 13, 13'... Compensation hydraulic system for one system failure, 1, 1'... Disc brake device, 12...
...Port, 20...Master cylinder, 22,2
2'...Union, 23...Front port, 2
3'...Rear port, 14,14',14''...Control cylinder, 16,16',16''...Control piston, 24,24',24''...Shutoff valve, 15,1
5', 15''...Communication path.

Claims (1)

[Scope of utility model registration request] In a disc brake device in which a caliper fitted with a piston that engages with a pad disposed opposite to a disc rotor is equipped with a hydraulic system for compensating for a loss in one system in a cylinder for the piston, the hydraulic system for compensating for a loss in one system is provided. a control cylinder communicating through a port of the cylinder and communicating with a front port and a rear port to the master cylinder, and a control piston is provided in the control cylinder so as to be slidable in the axial direction of the control cylinder, This control piston is provided with a communication passage that interconnects the cylinder port, the front port of the master cylinder, and the rear port of the master cylinder, and the pressure receiving surface of the control piston receives the hydraulic pressure of the front port and rear port of the master cylinder. A cutoff valve is provided in each communication passage at both ends of the control piston, and the cutoff valve operates in response to the movement of the control piston in the axial direction. A disc brake device characterized in that the disc brake device is configured to cut off communication with the disc brake device.