JPS62278328A - Cooling device for disk brake for vehicle - Google Patents

Abstract

PURPOSE:To cool a disk brake by utilizing an oil damper and make the device inexpensive and small-sized by connecting an oil pressure generating chamber and an oil reservoir chamber of the oil damper to the inlet and outlet of the cooling oil passage of a brake caliper respectively. CONSTITUTION:When a front fork F is shrunk during the travel of a vehicle, oil pressure is generated in a lower oil pressure generating chamber 29 of an oil damper Da, a check valve 39 is opened by this oil pressure, oil flows through a guide pipe 36, the oil passage of a brake caliper C and a discharge pipe 38, thus the brake caliper C is cooled. The oil discharged through the discharge pipe 38 is returned to an oil reservoir chamber 32. On the other hand, when the front fork F is extended, the lower oil pressure generating chamber 29 is decompressed to close the check valve 39. In addition, a check valve 28 in the front fork F is opened, thereby the oil in the lower oil pressure generating chamber 29 flows into an upper oil pressure generating chamber 30, and a damping action is performed by the compressive force of a coil spring 27 and the passage resistance of the check valve 28.

Description

[Detailed description of the invention] 3. Detailed description of the invention A8 Purpose of the invention (1) Industrial application field The present invention relates to a cooling device for a vehicle disc brake.

(2) Conventional technology Conventionally, this type of cooling device has a cooling water passage provided in the brake caliper of a disc brake, and the outlet of a water pump driven by a motor is connected to the inlet of the water passage. It is known that the outlet of the radiator is connected to the inlet of the radiator, and the outlet of the radiator is further connected to the suction port of the water pump (see Japanese Utility Model Publication No. 184445/1983).

(3) Problems to be Solved by the Invention However, in the conventional device described above, since the motor, water pump, and radiator are essential components, the number of parts increases, the manufacturing cost of the device is high, and the device becomes large. There is a problem with becoming.

In view of the above, an object of the present invention is to provide a cooling device that is small in size and has a small number of parts by using an oil damper for a wheel suspension system installed in a vehicle.

B1 Structure of the Invention (1) Means for Solving Problems The present invention connects the oil pressure generation chamber of an oil damper for a wheel suspension system and the inlet of a cooling oil passage formed in a brake caliper of a disc brake, Further, the oil reservoir chamber of the oil damper and the outlet of the oil passage are connected to each other.

(2) Effect With the above structure, the oil passage of the brake caliper is always filled with the oil of the oil damper.

When hydraulic pressure is generated in the hydraulic pressure generation chamber of the oil damper,
The oil pressure causes oil to flow through the oil passage, thereby cooling the brake caliper. The oil that has passed through the oil passage is returned to the oil reservoir chamber of the oil damper.

(3) Embodiment Figures 1 to 4 show a first embodiment in which the present invention is applied to a front wheel disc brake for a motorcycle.The disc brake B is constructed as a two-bottom sliding caliper type, and the front wheel suspension It consists of a telescopic pink type front fork F.

First, the disc brake B will be explained. As shown in FIG. 1, a bracket Br is disposed adjacent to one side of the brake disc D, which rotates in the direction of arrow R with the forward movement W when the vehicle moves forward. is fixed to the bottom case 22 of the front fork F by a pair of mounting bolts 1.1.

A brake caliper C cast from an aluminum alloy is connected to the bracket Br via a pair of sliding pins 37 and 3g parallel to the rotating shaft of the brake disc D, and thus to the axle 2.

As shown in FIG. 2, the bolt-shaped mounting base of one of the sliding pins 31 passes through the upper end of the bracket Br at a position radially outward of the brake disc D, and is attached to the bracket Br by screwing the nut 4 thereto. Fixed. The support portion of the sliding pier 31 is the support hole 5 of the brake caliper C. are slid together via boots 61. As shown in FIG. 3, the bolt-shaped mounting base of the other sliding pin 3□ is screwed onto the brake bracket (Br) at a position radially inward of the brake disc D. The support portion of the sliding pin 3□ is slidably fitted into a support hole 5□ formed in the brake caliper C via a boot 62.

The brake caliper C includes first and second pinching arms 71.7□ which sandwich a pair of friction pads P, P2 arranged on both left and right sides of the brake disc D, and a connecting portion 8 which connects both pinching arms 71, 7t. It is equipped with Both friction pads P,,P,
The back plate 9.9 has both pinching arms 7. ．． It is movably suspended on a pair of hanger pins 10, 10 parallel to the axle 2, which are installed between the wheels 12 and 12.

As shown in FIG. 4, through holes 11, 11 of hanger pins 10, 10 provided on each back plate 9, 9 are connected to each friction pad P,
P is made into a long hole so that it can move slightly in the circumferential direction of the brake disc D, and within the range of movement, the end face of each back plate 9.9 on the exit side of the brake disc D is in contact with the torque bearing surface 12 of the bracket Br. They come into contact via 13.

First pinch arm of brake caliper C7. A pressure oil introduction hole 15 communicating with a known brake mask cylinder (not shown) via a connecting pipe 14 and a pair of cylinder holes 16.16 connected thereto are formed in the cylinder hole 16.16.
A pair of pistons 17 and 17 that can press the back plate 9 of one of the friction pads Pl are slid together. 2nd pinching arm 7
□ comes into contact with the back plate 9 of the other friction pad P2.

Third. In FIG. 4, reference numeral 18 denotes a band spring, whose intermediate portion abuts the intermediate portion of the upper end surfaces of both back plates 9, 9, and engages with the ceiling surface protrusion of the connecting portion 8 of the brake caliper C, thereby tightening both ends. resiliently engaging opposite sides of the upper end surfaces of both backing plates 9.9, thereby holding the backing plate 9.9 in position and pressing against the hanger pins 10.10;
This prevents the friction pads P+ and Pg from moving inadvertently.

Second. As clearly shown in FIG. 3, a cooling oil passage 19 is formed in a meandering manner within the connecting portion 8 of the brake caliper C. In the illustrated example, the oil passage 19 includes a metal pipe 20, an inlet 19a and an outlet 19b of the oil passage 19.
The metal tube 20 and the connecting fittings 21. ．． 21□ is cast into the brake caliper C when it is cast.

Next, the front fork F will be explained with reference to FIG.

The front fork F includes a bottom case 22 and a fork pipe 23 slidably fitted into the bottom case 22. The end of the axle 2 is supported by an axle holder 24 at the bottom of the bottom case 22.

A seat pipe 25 is fixed concentrically inside the bottom case 22, and a piston 26 fixed to the upper end of the seat pipe 25 comes into sliding contact with the inner peripheral surface of the fork pipe 23. . fork vibe 23
Inside, a coil spring 27 is compressed between the upper end wall and the piston 26, and constantly biases the front fork F in the direction of extension.

Further, a check valve 28 is provided at the lower end of the fork pipe 23 and between it and the seat pipe 25.

When the front fork F contracts during the buffer action and hydraulic pressure is generated in the lower hydraulic pressure generating chamber 29 existing between the bottom case 22 and the seat pipe 25, the hydraulic pressure causes the check valve 2 to close.
8 opens, and on the other hand, when the front fork F extends, the check valve 28 closes, and the oil in the upper oil pressure generation chamber 30 divided by the fork pipe 23, seat pipe 25, and piston 26 is transferred to the lower oil pressure generation chamber 29 side. It is designed so that it does not flow to.

A plurality of orifices 31 are formed on the peripheral wall of the seat pipe 25 that partitions the upper hydraulic pressure generation chamber 30, and when the front fork F is extended, the oil flow rate from the upper hydraulic pressure generation chamber 30 is throttled by each orifice 31, and the oil flow rate from the upper hydraulic pressure generation chamber 30 is restricted. Oil sump chamber 3 inside 23 fork pipes that communicate with it
2.

A plurality of orifices 33 are formed in the lower peripheral wall of the seat pipe 25, and these orifices 33 allow communication between the lower oil pressure generation chamber 29 and the oil reservoir chamber 32 and generation of oil pressure in the lower oil pressure generation chamber 32.

Thus, the check valve 28, the lower oil pressure generation chamber 29, the upper oil pressure generation chamber 30, the orifices 31, 33, and the oil reservoir chamber 32 constitute the oil damper Da. In Figure 1, Q indicates the oil level.

A guide hole 35 that opens to the lower hydraulic pressure generation chamber 29 is formed in the peripheral wall near the bottom of the bottom case 22, and the guide hole 35 and the inlet 19a of the oil passage 19 in the brake caliper C are connected to each other by connecting fittings 36a at both ends. Introductory tube 3
Connected by 6.

Further, a guide hole 37 that opens to the oil reservoir chamber 32 is provided in the upper end wall of the fork pipe 23, and the guide hole 37 and the oil passage 19 are connected to each other.
The outlet 19b is connected to the outlet 19b by a discharge pipe 38 having connecting fittings 38a at both ends.

Brake caliper C is installed in the four holes 35 of the bottom case 22.
A check valve 39 is provided to prevent backflow of oil from the oil passage 19 to the lower oil pressure generation chamber 29.

Next, to explain the operation of this embodiment, the pressure oil introduction hole 1 is connected to the mask cylinder (not shown) by the rough construction of the brake pedal.
When pressure oil is supplied to both cylinder holes 16, 16 through 5, both pistons 17.17, which move forward due to the oil pressure, press the back surface of one friction pad P, so that friction pad Pi is applied to both hanger pins 10.10. is pressed against one side of the brake disc D. Then, due to the reaction, the brake caliper C slides between both the sliding pins 38, 3□ and both boots 6I, 6□, and moves both pistons 1.
7. The brake disc moves in the opposite direction to 17 and presses the back surface of the other friction pad P2 with the second pinching arm 7z, bringing it into pressure contact with the other side surface of the brake disc D, and as a result of the above, the brake disc rotates in the direction of arrow R. D can be braked.

During this braking, from the brake disc D to both friction pads P,
, pg is supported by the torque bearing surface 12 of the brake cylinder Br.

Due to the friction between both friction pads P and P2 and the brake disc D associated with the braking action, the brake caliper C is
Although it is heated by heat conduction from the friction pads P+ and Pi, the brake caliper C receives the following cooling action while the vehicle is running, so problems such as vapor lock do not occur.

That is, while the vehicle is running, the front fork F repeatedly contracts and expands due to vibrations from the road surface. At the time of contraction, hydraulic pressure is generated in the lower hydraulic pressure generating chamber 29, and the check valve 39 is opened by the hydraulic pressure. Introductory pipe 36, brake caliper C
Oil flows through the oil passage 19 and the discharge pipe 38, thereby cooling the brake caliper C. The oil discharged from the discharge pipe 38 is returned to the oil reservoir chamber 32 within the front fork F. When the front fork F is extended, the pressure in the lower oil pressure generation chamber 29 is reduced, so the check valve 39 closes and the backflow of oil from the oil passage 19 to the lower oil pressure generation chamber 29 is prevented.

On the other hand, in the front fork F, the check valve 28 is opened by the oil pressure in the lower oil pressure generation chamber 29, so the oil in the lower oil pressure generation chamber 29 flows into the upper oil pressure generation chamber 30, and therefore the compression force of the coil spring 27 and the reverse The flow path resistance in the stop valve 28 provides a buffering effect. When the front fork F is extended, the check valve 28 is closed by the oil pressure in the upper oil pressure generation chamber 30, so the oil in the upper oil pressure generation chamber 30 flows into the oil reservoir chamber 32 through each orifice 31. Since the flow path resistance is large, the elastic force of the coil spring 27 is greatly attenuated.

FIG. 5 shows a second embodiment of the invention, in which both cylinder holes 16
．． The first pincer 1I5i surrounds 16! An oil passage 19 is formed within 71. With this configuration, both cylinder holes 16.
16 can be efficiently (cooled).

In addition, although the present invention is applied to a front wheel disc brake of a motorcycle in the above embodiment, the present invention is also applied to a rear wheel disc brake and an automobile disc brake.

Alternatively, the stationary portions of the five-man pipe 36 and the discharge pipe 38 may be constructed of metal pipes with cooling fins to cool the oil supplied to the brake caliper C and the oil returned to the front fork F.

C1 Effects of the Invention According to the present invention, since the oil damper for the wheel suspension system already installed in the vehicle is used to cool the disc brake, the number of parts is reduced compared to the conventional device, and therefore the manufacturing cost of the device is reduced. Moreover, the device can be configured to be compact.

[Brief explanation of the drawing]

1 to 4 show a first embodiment of the present invention, in which FIG. 1 is an overall front view, FIG. 2 is a view in the direction of the arrow 1 in FIG. M-line sectional view, Figure 4 is Figure 2 TV-
FIG. 5 is a sectional view taken along line IV and is similar to FIG. 3 of the second embodiment of the present invention. B...Disc brake, C...Brake caliper, Da...Oil damper, F...Front fork as a wheel suspension device,

Claims (1)

[Claims] A hydraulic pressure generation chamber of an oil damper for a wheel suspension system is connected to an inlet of a cooling oil passage formed in a brake caliper of a disc brake, and an oil reservoir chamber of the oil damper is connected to an outlet of the oil passage. A cooling system for vehicle disc brakes.