JPH0669048U - Cooling structure for brake fluid in vehicle disc brake system - Google Patents

Abstract

(57) [Abstract] [Purpose] Cooling the brake fluid efficiently with a simple structure without using many dedicated devices and power sources. [Structure] Brake piping 6, 7 and inlet port 21
The four hydraulic chambers 17 and 18 facing each other and the two liquid passage holes 25 and 28 are connected in an annular shape. Further, the one-way valve 21 attached to the inlet port 21 and the one-way valve 31a integrally formed with the seal material 31 in the return path form a circuit circuit that allows the brake fluid in the path to flow only in one direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a disc brake device for a vehicle, which is a combination of a caliper body opposed to a piston and a hydraulic master cylinder. More specifically, the brake fluid used for the disc brake device is cooled to prevent vapor lock. Related to the structure.

[0002]

[Prior art]

 Disc brake systems used in automobiles and motorcycles may cause a so-called vapor lock phenomenon, in which the brake fluid in the brake system becomes hot and the braking force decreases due to continuous use on a downhill. For example, the technique disclosed in Japanese Utility Model Publication No. 63-8529 is proposed.

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 the brake fluid is forced into the path. By circulating it, the brake fluid, which has become hot in the hydraulic chamber of the caliper body, can be cooled with high efficiency.

[0004]

[Problems to be solved by the device]

 However, this cooling structure requires that the vehicle be stopped and that it be activated when the hydraulic pressure of the brake fluid generated in the hydraulic master cylinder is zero. It requires a vacuum device for operating the hydraulic cylinders, an electric motor or a solenoid, and many devices and parts such as a control circuit and an opening / closing valve for electrically operating these, and the overall size of the device is large and the weight of the vehicle body increases. Not only that, but the cost of the equipment and the installation cost were high.

Further, in order to operate this cooling structure, an engine or a battery must be used as a power source, and in consideration of battery exhaustion due to engine stop, the engine is rotated even when the vehicle is stopped. It was inconvenient because I couldn't cool it if I didn't.

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 having a simple structure, excellent usability and economical efficiency. Especially.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention forms a caliper body by connecting a pair of divided pieces, which are separately arranged on both sides of a disk rotor, and is formed opposite to each other with the disk rotor sandwiched therebetween. A piston is housed in each cylinder hole, and the hydraulic chambers defined between the piston and the bottom of the cylinder hole are communicated with each other through the liquid passage hole inside the caliper body. The chamber communicates with a separate hydraulic master cylinder, and the brake fluid supplied from the hydraulic master cylinder to the hydraulic chamber of one split piece is passed through the fluid passage hole to the hydraulic chamber of the other split piece. In the vehicle disc brake device for supplying, one end of the caliper body is opened to the outer surface of the one divided piece, and the other end is formed with a fluid passage communicating with a hydraulic chamber of the other divided piece. Then, the opening of the fluid passage hole is connected to the hydraulic master cylinder to form a return path for the brake fluid supplied to the hydraulic chamber of the other split piece described above, and to the joint surface of both split pieces. , A sealing material for sealing the liquid passage hole of the return path is sandwiched, and a one-way valve is integrally formed on the sealing material, and the one-way valve is provided between the hydraulic master cylinder and the hydraulic chamber of one of the divided pieces. It is characterized by the provision of.

[0008]

[Action]

 With this configuration, the brake fluid serves as a circuit circuit that circulates the hydraulic master cylinder and the caliper body in one direction. Of these, the hydraulic master cylinder goes through the hydraulic chamber of one split piece to the hydraulic chamber of the other split piece, and the return path goes from the hydraulic chamber of the other split piece to the hydraulic master cylinder. Become a route.

In this configuration, of the brake fluid in the hydraulic chamber expanded by the braking operation, the amount of the rollback fluid that the piston is returned to the hydraulic chamber side by the restoring force of the angular seal when the braking is released is 1 The feed amount is one time, and it is circulated in one direction by the one-way valves provided on each of the forward route and the return route.

[0010]

【Example】

 An embodiment in which the present invention is applied to a front brake of a motorcycle will be described with reference to the drawings.

The disc brake device 1 includes a disc rotor 2 that rotates in the direction of arrow A, a caliper body 4 that presses a pair of friction pads 3 and 3 against the rotor 2 for braking, and a boosting pressure to the body 4. It is composed of a hydraulic master cylinder 5 for supplying the brake fluid, and two brake pipes 6, 7 connecting the caliper body 4 and the hydraulic master cylinder 5.

The friction pad 3 is configured by joining a lining 3a that is in sliding contact with the disc rotor 2 and a metal back plate 3b, and is a hanger suspended from a bridge portion 4c across a ceiling opening 4d. The disc rotor 2 is sandwiched between the divided pieces 4a and 4b by the pin 8 and is also pulled out from the bridge portion 4c through the ceiling opening portion 4d at the time of maintenance or pad replacement.

In the caliper body 4, four large and small cylinder holes 9 and 10 are arranged opposite to a pair of divided pieces 4 a and 4 b which are divided and arranged on both sides of the disk rotor 2, and these cylinder holes 9 and 10 are arranged in the cylinder holes 9 and 10. , A four-pot piston-opposing type in which the cup-shaped pistons 11 and 12 are respectively inserted, one split piece 4a is located outside the vehicle body of the disc rotor 2, and the other split piece 4b is located inside the vehicle body of the disc rotor 2. , The joint surfaces 4e of the bridge portions 4c are abutted against each other, and four connecting bolts 13 are screwed into the bridge portions 4c to be integrally connected.

The hydraulic master cylinder 5 pushes a piston inside a cylinder hole by a grip operation of a brake lever 14 pivotally supported by a bracket 5a for mounting a bar handle, and also a pressurizing chamber at the bottom of the cylinder (both are shown in FIG. (Not shown) is reduced to boost the brake fluid inside the boost chamber, and the brake pipes 6 and 7 connected to the caliper body 4 are gathered together near the hydraulic master cylinder 5. It is connected to the above-mentioned booster chamber.

Angular seals 15 and 16 are fitted in the seal grooves 9a and 10a formed on the inner circumferences of the cylinder holes 9 and 10, respectively, and the pistons 11 and 12 are fitted with the angular seals 15 and 16, respectively. It is held liquid-tightly and movably inside the cylinder holes 9 and 10. The pistons 11 and 12 and the corner seals 15 and 16 are tightly fitted to each other, and when the pistons 11 and 12 move outward in the cylinder holes 9 and 10, the inner circumferences of the seals 15 and 16 are controlled. The parts are deformed in the same direction as the pistons 11 and 12, and at the time of releasing the braking, the pistons 11 and 12 are moved into the cylinder holes by utilizing the force that the inner peripheral parts of the corner seals 15 and 16 restore to their original shapes. It is designed to return inward in the direction of 9 and 10.

Hydraulic chambers 17 and 18 are defined between the pistons 11 and 12 and the bottoms of the cylinder holes 9 and 10, and two hydraulic chambers 17 that are adjacent to each other outside or inside the vehicle body of the disc rotor 2 are formed. , 18 are communicated with each other through a through hole 19. An inlet port 20 is provided in communication with the through hole 19 in the boss portion 4f projecting to one of the divided pieces 4a, and a one-way valve 21 is mounted inside the inlet port 20 and an outside opening is provided. A union bolt 22 for connecting the brake pipe 6 is screwed to the portion.

The one-way valve 21 is one in which the valve body 23 is biased from the through hole 19 side to the small diameter portion 20 a of the inlet port 20 by the elastic force of the coil spring 24. Only the brake fluid supplied to the caliper body 4 through 6 is allowed, and no reverse flow is made from the body 4 to the brake pipe 6.

On the disc entry side of the bridge portion 4c, a liquid passage hole 25 connecting the opposed small-diameter hydraulic chambers 17, 17 is bored in both divided pieces 4a, 4b. On one of the divided pieces 4a, a bleeder hole 26 for bleeding air, which communicates with the liquid passage hole 25, is formed in the vicinity of the joint surface 4e. The communication with the atmosphere is blocked by the brewer screw 27.

Further, a liquid passage hole 28 is formed on the disc spill-out side of the bridge portion 4c over the divided pieces 4a and 4b, and one end of the liquid passage hole 28 has one divided piece 4a. An outlet port 29 is opened on the outer surface of the brake pipe 7. The brake pipe 7 is connected to the port 29, and the other end communicates with the large-diameter hydraulic chamber 18 of the other split piece 4b. There is.

Sealing materials 30 and 31 for sealing the liquid passage holes 25 and 28 in a liquid-tight manner are sandwiched between the joint surfaces 4e, and the sealing material 31 on the liquid passage hole 28 side is commonly referred to as duck bill. A so-called one-way valve 31a is integrally formed on the inner peripheral portion. This one-way valve 31a projects toward the one divided piece 4a side, and allows the brake fluid in the hydraulic chambers 17 and 18 of the other divided piece 4a to flow to the brake pipe 7 but not to the opposite direction. It has become.

According to the present embodiment, the brake pipes 6 and 7 of both sides, the inlet port 20 of the caliper body 4 and the four hydraulic chambers 17 and 18, and the two liquid passage holes 25 and 28 are provided. The circuit circuit is connected in an annular shape, and the two one-way valves 21 and 31a in the caliper body 4 serve as a circuit circuit that allows the brake fluid in the path to flow only in one direction. In the circuit circuit, the brake pipe 6 and the hydraulic chambers 17 and 18 of the other divided piece 4b serve as a forward path, and the remaining liquid passage holes 28 and the brake pipe 7 constitute a return path.

Next, the operation of this embodiment will be described.

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

The brake fluid supplied to the outward path expands the volumes of the hydraulic chambers 17 and 18 of both of the divided pieces 4a and 4b, and the respective pistons 11 and 12 cause the inner peripheral portions of the corner seals 15 and 16 to move. While being deformed, the cylinder holes 9 and 10 are advanced and the friction pads 3 and 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 chambers 17 and 18 are decompressed, and the respective pistons 11 and 12 are moved to the cylinder holes 9 and 10 by the restoring force of the corner seals 15 and 16. The hydraulic chambers 17 and 18 are pulled back toward the bottom, and the hydraulic chambers 17 and 18 are contracted while returning to a predetermined retracted position. By this return, the amount of the brake fluid that has filled the hydraulic pressure chambers 17 and 18 expanded during braking is discharged from the hydraulic pressure chambers 17 and 18 in the amount of return of the pistons 11 and 12, that is, the rollback amount.

In the one divided piece 4a, the discharged brake fluid is sent from the fluid passage hole 25 in the outward path to the hydraulic chambers 17, 18 of the other divided piece 4b by the backflow prevention of the one-way valve 21. In the other divided piece 4b, by the supply from one divided piece 4a, it is sent to the brake pipe 7 through the liquid passage hole 28 in the return path, and the brake fluid is circulated in one direction in the circuit circuit. Become.

In this embodiment, as described above, the brake fluid whose temperature has been raised in the hydraulic chambers 17 and 18 is sent out from the hydraulic chambers 17 and 18 by a normal brake operation, and the circuit circuit is circulated in one direction. This makes it possible to cool efficiently, and most of the cooling structure is composed of the same disc brake device as the conventional one, so the structure is simple and the cost is low, and compared with the conventional one that uses many dedicated equipment. Then, there is a significant difference in the cost effect due to the omission of equipment costs and installation costs, the probability of failure is low, and the maintainability is excellent.

Further, since the other structure of the cooling structure except the brake pipes 6 and 7 is provided inside the caliper body 4, the caliper body 4 is compact, and at the same time, the risk of damage due to external force is extremely low. In addition, since the one-way valve 31a in the return path is integrally formed by using the seal 31 sandwiched between the joint surfaces 4e, it occupies a small area, has excellent mountability, and can be manufactured at low cost.

Further, since the weight of the vehicle body hardly increases and the engine rotation and the battery are not used for the cooling structure, the running cost is excellent. Furthermore, the amount of brake fluid that can be circulated by one brake operation is intermittent and small compared to the conventional continuous circulation, but it does not require the vehicle to stop, so a brake that can be circulated and cooled by repeated braking operations. The quantity is not small.

In the present invention, the one-way valve may be integrally formed with the sealing material on the outward path side. Further, the brake pipe of the return path may be directly connected to the pressure increasing chamber of the hydraulic master cylinder. Further, the one-way valve in the forward 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 piping in the forward path.

[0031]

EFFECTS 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 from the hydraulic chamber and circulated in one direction by normal braking operation. This is because it efficiently cools, and most of the cooling structure is composed of the same disk brake device as the conventional one, so it is extremely low cost, and compared with the conventional one that uses many special equipment, There is a significant difference in the cost effect due to the elimination of installation costs and installation costs. Moreover, the structure is simple, the probability of failure is low, and the maintainability is excellent.

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

Further, since the weight of the vehicle body is hardly increased and the engine rotation and battery are not used for the cooling structure, the running cost is excellent. Moreover, since the vehicle is not stopped, effective cooling can be performed by repeating the braking operation.

[Brief description of 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 ... Forward route brake pipe 7 ... Return route brake pipe 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 housed in the cylinder holes 9, 10 14 ... Brake levers 15, 16 ... Square seals 17, 18 ... Hydraulic chambers 19 ... Adjacent A through hole connecting the large and small hydraulic chambers 17 and 18 that fit together 20 ... Inlet port 21 ... One-way valve on the forward path attached to the inlet port 22 ... Union bolt 25 ... Liquid passage hole on the forward path 28 ... Return path side Liquid through hole 29 ... Outlet port of liquid through hole 28 on 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)

[Scope of utility model registration request] 1. A caliper body is formed by connecting a pair of divided pieces, which are dividedly arranged on both sides of a disk rotor, and pistons are respectively housed in cylinder holes formed opposite to each other with the disk rotor sandwiched between the divided pieces. Then, the hydraulic chambers defined between the piston and the bottom of the cylinder hole are communicated with each other through the hydraulic holes inside the caliper body, and the hydraulic chambers of one of the divided pieces are separated by a separate hydraulic pressure. A disc brake device for a vehicle that communicates with the master cylinder and supplies the 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 fluid passage hole. In the caliper body, one end is opened to the outer surface of the one divided piece, and the other end is formed with a liquid passage hole communicating with the hydraulic chamber of the other divided piece, and the opening of the liquid passage hole is formed as described above. Hydraulic pressure Connected to the master cylinder to form a return path for the brake fluid supplied to the hydraulic chamber of the other split piece, and a sealing material for sealing the fluid passage hole of the return path on the joint surface of both split pieces. A disc brake device for a vehicle, which is sandwiched and integrally formed with a one-way valve in the sealing material, and the one-way valve is disposed between the hydraulic master cylinder and the hydraulic chamber of one of the divided pieces. Brake fluid cooling structure in.