JP2573974Y2 - Cooling structure of brake fluid in vehicle disk brake system - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk brake device for a vehicle comprising a combination of a caliper body opposed to a piston and a hydraulic master cylinder, and more particularly, to cooling a brake fluid used in the disk brake device. And a structure for preventing vapor lock.

[0002]

2. Description of the Related Art In a disk brake device used for an automobile or a motorcycle, a so-called vapor lock phenomenon in which the brake fluid in a brake system becomes hot and the braking force is reduced due to continuous use on a downhill or the like. Therefore, for example, a technique disclosed in Japanese Utility Model Publication No. 63-8529 has been proposed.

[0003] In this disc brake device, a hydraulic cylinder is added to a caliper body and a hydraulic master cylinder, these are arranged in a circuit piping path, the hydraulic cylinder is operated like a pump, and brake fluid is forcibly circulated in the path. By doing so, the brake fluid that has become hot in the hydraulic chamber of the caliper body can be cooled with high efficiency.

[0004]

However, this cooling structure requires the vehicle to be stopped and to operate when the hydraulic pressure of the brake fluid generated in the hydraulic master cylinder is zero. In addition to a hydraulic device and a hydraulic pressure detection device, a vacuum device or an electric motor or a solenoid for operating a hydraulic cylinder, and a number of devices and components such as a control circuit and an on-off valve for electrically operating these components are required.
Not only did the entire apparatus become large and the body weight increased, but also the costs of equipment and mounting costs increased and the cost was high.

In order to operate this cooling structure,
An engine or a battery must be used as a power source. In consideration of a dead battery caused by the stop of the engine, even if the vehicle is stopped, it cannot be cooled unless the engine is rotating.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide an inexpensive brake fluid cooling structure which is simple in structure, easy to use and economical. It is in.

[0007]

According to the present invention, a caliper body is formed by connecting a pair of divided pieces arranged on both sides of a disk rotor. Hydraulic chambers defined between the piston and the bottom of the cylinder hole are communicated with the hydraulic chambers defined between the piston and the bottom of the cylinder hole by the liquid holes inside the caliper body. Then, the hydraulic chamber of one of the divided pieces is communicated with a separate hydraulic master cylinder, and the brake fluid supplied from the hydraulic master cylinder to the hydraulic chamber of one of the divided pieces is passed through the hydraulic through hole. In the vehicle disc brake device for supplying to the hydraulic chamber of the other divided piece, one end of the caliper body is opened to the outer surface of the one divided piece, and the other end is the hydraulic pressure of the other divided piece. Forming a fluid communication hole communicating with the hydraulic master cylinder and forming a return path for the brake fluid supplied to the hydraulic chamber of the other divided piece. A sealing material for sealing the liquid passage hole of the return path is sandwiched between the joining surfaces of the divided pieces, and a one-way valve is integrally formed with the sealing material, so that the hydraulic master cylinder and the hydraulic chamber of one of the divided pieces are formed. The one-way valve is arranged between the two.

[0008]

In this configuration, a circuit circuit in which the brake fluid circulates in one direction between the hydraulic master cylinder and the caliper body is provided. Of these, the path from the hydraulic master cylinder to the hydraulic chamber of the other divided piece via the hydraulic chamber of one of the divided pieces goes along the path, and the path from the hydraulic chamber of the other divided piece to the hydraulic master cylinder returns. Become a route.

With this configuration, of the brake fluid in the hydraulic chamber expanded by the braking operation, the amount of rollback fluid whose piston is returned to the hydraulic chamber by the restoring force of the square seal due to the release of braking becomes 1 The feed amount becomes one time, and is circulated in one direction by one-way valves provided in each of the going path and the returning path.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a front brake of a motorcycle will be described below with reference to the drawings.

The disc brake device 1 includes a disc rotor 2 rotating in the direction of arrow A, and a caliper body 4 for applying a brake to the rotor 2 by pressing a pair of friction pads 3.
And a hydraulic master cylinder 5 for supplying the brake fluid to the body 4, and two brake pipes 6 and 7 connecting the caliper body 4 and the hydraulic master cylinder 5.

The friction pad 3 is formed by joining a lining 3a that comes into sliding contact with the disk rotor 2 and a metal back plate 3b, and is hung from a bridge 4c across a ceiling opening 4d. With the pin 8, the divided pieces 4a,
4b, the disk rotor 2 is interposed therebetween, and at the time of maintenance or pad replacement, the bridge portion 4c
Through the ceiling opening 4d.

The caliper body 4 has a pair of divided pieces 4a and 4b which are divided and arranged on both sides of the disk rotor 2.
, Four large and small cylinder holes 9 and 10 are opposed to each other, and a four-pot piston opposed type in which cup-shaped pistons 11 and 12 are inserted into these cylinder holes 9 and 10, respectively, and one of the divided pieces 4a is , The other divided piece 4b is disposed outside the vehicle body of the disk rotor 2 and the other divided piece 4b is disposed inside the vehicle body of the disk rotor 2, and the joining surface 4e of the bridge portion 4c is abutted, and four connecting bolts are connected to the bridge portion 4c. 13 are screwed together to be integrally connected.

The hydraulic master cylinder 5 includes a brake lever 1 pivotally supported by a bracket 5a for mounting a bar handle.
By the gripping operation of No. 4, the piston inside the cylinder hole is pushed and the pressurizing chamber (both not shown) at the bottom of the cylinder is also reduced, so that the brake fluid in the pressurizing chamber is pressurized. The brake pipes 6 and 7 connected to the body 4 are united in the vicinity of the hydraulic master cylinder 5 and connected to the above-described pressure increasing chamber.

Square seals 15 and 16 are fitted in seal grooves 9a and 10a formed in the inner periphery of the cylinder holes 9 and 10, respectively.
The liquid holes 5 and 16 hold the cylinder holes 9 and 10 movably and liquid-tight. The pistons 11, 12 and the square seals 15, 16 are tightly fitted with each other. During braking, when the pistons 11, 12 move outward in the cylinder holes 9, 10, the inner peripheral portions of the seals 15, 16 are closed. But,
The pistons 11, 12 are deformed in the same direction along with the pistons 11, 12, and at the time of braking release, the pistons 11, 12 are moved into the cylinder holes 9, 10 by utilizing the force that restores the inner peripheral portions of the square seals 15, 16 to their original shapes. It is designed to return inward.

Each piston 11, 12 and the cylinder hole 9, 1
Hydraulic pressure chambers 17 and 18 are defined between the hydraulic pressure chambers 17 and 18, and two hydraulic pressure chambers 17 and 18 adjacent to each other outside or inside the vehicle body of the disk rotor 2 communicate with each other through through holes 19. I have. A boss 4f protruding from one of the divided pieces 4a is provided with an inlet port 20 communicating with the through hole 19. A one-way valve 21 is mounted inside the inlet port 20, and an outer opening is provided. , A union bolt 22 for connecting the brake pipe 6 is screwed.

The one-way valve 21 includes a valve body 23
Is biased from the through hole 19 side to the small diameter portion 20a of the inlet port 20 by the resilient force of the coil spring 24. The one-way valve 21 introduces the brake fluid supplied to the caliper body 4 through the brake pipe 6. Only, and does not flow backward from the body 4 to the brake pipe 6.

A liquid passage 25 for connecting opposed small-diameter hydraulic chambers 17, 17 is provided on the disk reciprocating side of the bridge portion 4c.
It is drilled over both divided pieces 4a, 4b.
In one of the divided pieces 4a, an air bleeder hole 26 communicating with the liquid through hole 25 is formed in the vicinity of the joint surface 4e, and is screwed into the opening except during air bleeding. The communication with the atmosphere is interrupted by the brewer screw 27.

A liquid through hole 28 is formed in the bridge 4c on the disk outlet side over the divided pieces 4a and 4b. One end of the liquid through hole 28 is connected to one of the divided pieces 4a and 4b.
a, the brake pipe 7 is connected to the port 29, and the other end is connected to the large-diameter hydraulic chamber 18 of the other divided piece 4b.
Is in communication with

The above-mentioned liquid through holes 25 and 28 are provided in the joint surface 4e.
Are sealed in a liquid-tight manner, and a one-way valve 31a, commonly called a duck bill, is integrally formed on the inner peripheral portion of the seal material 31 on the liquid through hole 28 side. The one-way valve 31a protrudes toward one of the divided pieces 4a, and
a, the brake fluid in the hydraulic chambers 17 and 18 is supplied to the brake pipe 7
, But not in the opposite direction.

In this embodiment, the brake pipes 6 and 7, the inlet port 20 of the caliper body 4 and the four hydraulic chambers 17 and 18, and the two
5 and 28 are connected in a ring shape, and two one-way valves 21 and 31a in the caliper body 4 constitute a circuit circuit that allows the brake fluid in the path to flow only in one direction. In the circuit circuit, the passage between the brake pipe 6 and the hydraulic chambers 17 and 18 of the other divided piece 4b is an outgoing path, and the remaining liquid passage 28 and the brake pipe 7
Constitute a return path.

Next, the operation of this embodiment will be described.

By the operation of gripping the brake lever 14,
The brake fluid pressurized in the pressurizing chamber of the hydraulic master cylinder 5 passes through the inlet pipe 20 and the through hole 19 of one of the divided pieces 4a from the brake pipe 6 on the going path, and the hydraulic chambers 17, 18 and further through the liquid passage hole 25 of the going path, the hydraulic chambers 17 and
18. A part of the brake fluid from the pressurizing chamber also enters the brake pipe 7 in the return path, but is prevented from entering further by the one-way valve 31a of the seal material 31 provided in the liquid passage hole 28 in the return path. At the same time, the brake fluid that has entered the liquid passage hole 28 in the return path from the large-diameter hydraulic chamber 18 of the other divided piece 4b reaches the one-way valve 31a and cancels the hydraulic pressure.

The brake fluid supplied to the going path enlarges the volume of the hydraulic chambers 17 and 18 of both the divided pieces 4a and 4b, and the pistons 11 and 12 respectively
While deforming the inner peripheral portion of the cylinder 16, the cylinder holes 9, 10 are advanced, and the friction pads 3, 3 are pressed against both side surfaces of the disk rotor 2 to perform a braking action.

Next, when the gripping operation of the brake lever 14 is released, the hydraulic pressure chambers 17 and 18 are depressurized, and the respective pistons 11 and 12 are caused by the restoring force of the square seals 15 and 16 to close the cylinder holes 9 and 10. It is pulled back toward the bottom and returns to a predetermined retracted position while reducing the hydraulic pressure chambers 17 and 18. By this return, the hydraulic chambers 17, which have been expanded during braking,
The brake fluid satisfying No. 18 is
, Ie, the amount of rollback, is discharged from the respective hydraulic chambers 17 and 18.

The discharged brake fluid is supplied to one of the divided pieces 4a by preventing the one-way valve 21 from flowing backward.
The liquid is supplied from the liquid passage hole 25 in the going path to the hydraulic chambers 17 and 18 of the other divided piece 4b, and in the other divided piece 4b, the liquid is supplied from the one divided piece 4a to the liquid passage hole 28 in the return path. Is sent to the brake pipe 7, and the brake fluid flows in one direction in the circuit circuit.

In this embodiment, as described above, the brake fluid heated in the respective hydraulic chambers 17 and 18 is sent out from the hydraulic chambers 17 and 18 by a normal braking operation, and the circuit circuit is circulated in one direction. Cooling is efficient by this, and most of the cooling structure is configured with the same disk brake device as the conventional one, so the structure is simple and very low cost, compared with the conventional one using many dedicated devices In addition, there is a remarkable difference in cost effects due to elimination of equipment costs and installation costs, and there is a low probability of failure and excellent maintainability.

Further, since another structure of the cooling structure except for the brake pipes 6 and 7 is provided inside the caliper body 4, the structure is compact and the possibility of damage by external force is extremely low. Also, the one-way valve 31 in the return path
Since a is integrally formed by using the seal 31 sandwiched between the joining surfaces 4e, it can be manufactured with a small occupied area, excellent attachment properties, and at low cost.

Further, since the weight of the vehicle body hardly increases and the cooling structure does not use the rotation of the engine or the battery, the running cost is excellent. Furthermore, the amount of brake fluid that can be circulated by a single braking operation is intermittent and small, compared to conventional continuous circulation. Is not small.

In the present invention, a one-way valve may be formed integrally with the sealing member on the outgoing path side. In addition, the brake pipe in the return path may be directly connected to the boosting chamber of the hydraulic master cylinder. Further, the one-way valve in the going path may be incorporated outside the caliper body, for example, between the boss portion of the inlet port and the union bolt, or in the brake pipe in the going path.

[0031]

[Effect of the Invention] Since the present invention is configured as described above, the brake fluid, which has been heated in the hydraulic chamber, is sent out of the hydraulic chamber by a normal brake operation and is forcibly circulated in one direction. In this way, cooling is efficient, and most of the cooling structure is configured with the same disk brake device as before, so it is very low cost and compared with the conventional one that uses many dedicated equipment, There is a significant difference in cost effectiveness due to elimination of costs and installation costs. The structure is simple, the probability of failure is low, and the maintenance is excellent.

Furthermore, since most of the cooling structure is provided in the caliper body, the cooling structure is compact and the possibility of damage due to external force is extremely low. In addition, since the one-way valve in the return path is integrally formed using the seal attached to the joint surface of the divided pieces, it can be manufactured with a small occupied area, with excellent mountability, and at low cost.

Further, since there is almost no increase in the weight of the vehicle body and no engine rotation or battery is used for the cooling structure,
Excellent running cost. Further, since the stop of the vehicle is not required, effective cooling can be performed by repeating the brake operation.

[Brief description of the drawings]

FIG. 1 is a schematic view of a disc brake device showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disc brake device 2 ... Disc rotor 3 ... Friction pad 4 ... Caliper body 5 ... Hydraulic master cylinder 6 ... Brake pipe of going path 7 ... Brake pipe of returning path 4a ... One divided piece 4b ... The other divided piece 9 , 10 ... Large and small cylinder holes formed in the divided pieces 4a, 4b 11, 12 ... Pistons accommodated in the cylinder holes 9, 10 14 ... Brake levers 15, 16 ... Square seals 17, 18 ... Hydraulic pressure chamber 19 ... Next Through-holes connecting the large and small hydraulic chambers 17 and 18 that match each other 20 ... Inlet port 21 ... One-way valve on the outgoing path side mounted on the inlet port 20 22 ... Union bolt 25 ... Fluid through-hole on the outgoing path side 28 ... Return path side Of the liquid passage hole 29 of the return path side; and 30 of the outlet port of the liquid passage hole 30 of the return path side. Rotational direction of the sealing material 31 ... return path side of the one which is integrally formed on the sealing member 31a ... sealing member 31 provided in the fluid communication hole 28-way valve A ... disk rotor 2

Claims (1)

(57) [Scope of request for utility model registration] A caliper body is formed by connecting a pair of divided pieces arranged on both sides of a disk rotor, and a piston is accommodated in each of the divided pieces in a cylinder hole formed to face the disk rotor. Then, the hydraulic chambers defined between the piston and the bottom of the cylinder hole communicate with each other through a liquid through hole inside the caliper body. A disk brake device for a vehicle that communicates with a master cylinder and supplies brake fluid supplied from the hydraulic master cylinder to the hydraulic chamber of one of the divided pieces to the hydraulic chamber of the other divided piece through the liquid through hole. In the caliper body, one end is opened on the outer surface of the one divided piece, and the other end is formed with a liquid communication hole communicating with the hydraulic chamber of the other divided piece, and the opening of the liquid communication hole is Hydraulic pressure A seal member that connects to the master cylinder to form a return path for the brake fluid supplied to the hydraulic chamber of the other divided piece, and seals the liquid passage hole of the return path to the joint surface of the two divided pieces. A disc brake device for a vehicle, wherein a one-way valve is integrally formed with the sealing member, and a one-way valve is disposed between the hydraulic master cylinder and a hydraulic chamber of one of the divided pieces. Cooling structure of brake fluid in