JPH0435248Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a cooling device for cooling a brake device for a vehicle.

PRIOR ART In a vehicle brake device, for example, a disc brake, the disc rotor is generally covered from both sides in the axial direction by a wheel and a dust cover, while in a drum brake, the disc rotor is generally covered by a rotating drum. Since the brake shoe is disposed inside the brake shoe and the opening of the rotating drum is covered by a bucking plate, the frictional heat generated during braking tends to be trapped inside. For this reason, by forming air introduction holes in the dust cover, bucking plate, etc., and protruding from the periphery of the air introduction hole a guide member that guides air into the brake system when the vehicle is running, the brake system is being forced to cool down.

Problems to be Solved by the Invention However, if the air introduction hole and the guide member are made larger in order to further improve the cooling effect of the brake device, or if multiple sets of these air introduction holes and guide members are provided, the brake device In the past, it has been relatively difficult to cool the brake system sufficiently, as muddy water and foreign objects can easily enter the brake system, and depending on the type of vehicle, it may not be possible to secure installation space for the guide member. It was hot.

Means for Solving the Problems The present invention was developed against the background of the above-mentioned circumstances, and its gist consists of a main body, a rod protruding freely within the main body,
It is fixed to the protruding end side of the rod so as to cover the main body from one direction in the axial direction, and moves toward and away from the main body according to the relative displacement between the sprung member and the unsprung member. A device for cooling a brake device of a vehicle in a vehicle equipped with a shock absorber having a movable bottomed cylindrical cover portion, the device comprising: a formed within the cover portion;
an air chamber whose volume is changed according to the relative displacement between the sprung member and the unsprung member, and (b) an air chamber provided between the air chamber and the brake device to supply air for cooling the brake device. A cooling air outlet leading from the air chamber to the brake device, and an intake path communicating the air chamber with the atmosphere, allowing air to flow into the air chamber but preventing air from flowing out from the air chamber. The air conditioner includes an intake valve mechanism, and a discharge valve mechanism that is provided in the cooling air outlet path and that allows air to flow out of the air chamber but prevents air from flowing into the air chamber.

By doing this, the volume of the air chamber formed in the cover portion of the shock absorber is changed according to the relative displacement between the sprung member and the unsprung member of the vehicle, and accordingly, the volume of the air chamber is changed. Air is caused to flow into the air chamber by a suction valve mechanism provided in an intake path communicating with the atmosphere, and the air is provided in a cooling air outlet path provided between the air chamber and the brake device and the cooling air outlet path. is led to the brake system through a discharge valve mechanism.

Effect of the invention As a result, cooling air can be intermittently blown from the air chamber of the shock absorber to the brake device as the sprung member and the unsprung member vibrate relative to each other when the vehicle is running. The brake device can be cooled more effectively than before without increasing the size or number and regardless of the type of vehicle.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

FIG. 1 is a diagram showing the main parts of a vehicle equipped with a cooling device to which the present invention is applied, in which a cross member 10
A pair of arms 12 and 14 are rotatably attached to one end of each of the arms 12 and 14, and a knuckle 20 is attached to the other end of each of these arms 12 and 14 via ball joints 16 and 18, respectively. ing. A hub 22 is provided on a shaft (not shown) protruding from the nutcle 20 so as to be relatively rotatable via a bearing, and a disk rotor 24 and a wheel (not shown) are attached to a flange portion 23 of the hub 22. They are integrally fixed to each other with bolts or the like. Natsukuru 20
A dust cover 26 having a disk shape as a whole is fixed to the disk rotor 24, and the disk rotor 24 is covered from both sides in the axial direction by this dust cover 26 and the wheel.
4 is prevented from adhering to muddy water or foreign matter. A support member (not shown) fixed to the knuckle 20 is provided on the outer periphery of the disk rotor 24, and is housed in a notch (not shown) formed in a part of the circumferential direction of the dust cover 26. A caliper (not shown) is provided astride the disk rotor 24 so as to be movable in a direction parallel to the axis of the disk rotor 24 . Based on the operation of this caliper, the disc rotor 24 is compressed from both sides in the axial direction, thereby performing braking, and the disc rotor 24, the caliper, etc. constitute the brake device of this embodiment. There is. Note that 28 is a compression spring provided between the arms 12 and 14.

Between the vehicle body 30 and one arm 14, the vehicle body 30 and the arm 14 are connected when the vehicle is running.
A shock absorber 32 is provided for damping relative vibrations between the cross members 10 in the direction of approaching and separating them from each other. Therefore, in this embodiment, the vehicle body 30 constitutes the sprung member, and the cross member 10, the arm 14, etc. constitute the unsprung members. The shock absorber 32 includes a piston 34 provided with a predetermined orifice mechanism, and a piston 34, as shown in FIGS.
a pair of liquid chambers 3 provided on both sides in the axial direction of the liquid chambers 3 and communicated with each other via the orifice mechanism;
6, 38, and at one end said arm 14
By having one end fixed to the piston 34 and the other end attached to the car body 30, the other end of the main body 40 responds to the relative vibration of the car body 30 and the cross member 10. A rod 42 that can freely protrude from the side,
The rod 42 is integrally fixed to the other end (projecting end) of the rod 42 and covers the main body 40 for a predetermined distance in the axial direction from the other end. There is. Since the shock absorber 32 is well known and not necessarily necessary for understanding the present invention, a detailed explanation of its vibration damping effect will be omitted.

As shown in FIG. 2, a rubber seal member 46 is inserted between the opening-side inner peripheral edge of the cover portion 44 and the main body portion 40, so that a shock absorber is inserted into the cover portion 44. An air chamber 48 is formed whose volume can be changed in response to expansion and contraction of the rod 32, that is, relative movement of the main body 40 and the rod 42 toward and away from each other in the axial direction. A communication hole 49 formed on the sealing member 46 side of the cover part 44 and communicating the air chamber 48 with the atmosphere allows air to flow into the air chamber 48 but prevents air from flowing out from the air chamber 48. Intake valve 5
On the other hand, a hole 51 formed at the end of the cover portion 44 opposite to the side where the sealing member 46 is provided allows air to flow out from the air chamber 48, but does not allow air to flow out. A vent valve 52 is provided to prevent air from entering the chamber 48. One end of a metal flexible tube 54 is attached to the discharge valve 52, and the other end of the tube 54 substantially faces the braking surface of the disc rotor 12 of the dust cover 26. It is fixed while being inserted into a through hole formed at the position. Therefore, in this embodiment, the hole 51
The tube 54 functions as a cooling air outlet path, and the communication hole 49 functions as an intake path.
constitute the discharge valve mechanism. The suction valve 50 and the discharge valve 52 are constructed of so-called check valves, and since such check valves are well known, a detailed explanation of their structure will be omitted.

When the shock absorber 32 is expanded when a vehicle equipped with the cooling device configured as described above is running, the volume of the air chamber 48 is increased and becomes negative pressure, so that atmospheric air is sucked in through the intake valve 50. At the same time, the shock absorber 3
When the tube 2 is deflated, the air in the air chamber 48 is blown from the tip of the tube 54 onto the braking surface of the disc rotor 24 through the exhaust valve 52. As a result, cooling air is intermittently blown from the air chamber 48 toward the disc rotor 24 as the shock absorber 32 expands and contracts repeatedly due to vibrations when the vehicle is running, so a relatively large amount of air is introduced into the dust cover 26. The braking surface of the disc rotor 24 and the dust cover 26 can be easily controlled without providing holes and guide members or multiple sets of air introduction holes and guide members.
The space between the disk rotor 24 and the disk rotor 24 can be cooled more effectively than in the past. This is particularly noticeable in front-wheel drive vehicles where the installation space for guide members is relatively limited. Note that such a cooling device is more preferably used in combination with conventional air introduction holes and guide members.

Further, according to this embodiment, the air discharged from the air chamber 48 is transported through a relatively long metal tube 54.
Since the tube 54 is guided to the brake device through the tube 54, there is an advantage that the air passing through the tube 54 can be effectively cooled while the vehicle is running.

Further, according to this embodiment, since the configuration is such that low compressed air is generated based on the expansion and contraction of the shock absorber 32 provided in advance in the vehicle, the number of parts and manufacturing cost etc. do not increase by that much. There is an advantage that a suitable cooling device can be obtained.

In the above-mentioned embodiment, the suction valve 50 is provided directly on the cover part 44, but it is not necessary to do so. It may be installed on the road.

Further, in the above-described embodiment, the discharge valve 52 is provided directly on the cover portion 44, but this is not necessarily necessary, and it may be provided at the middle portion or the tip portion of the tube 54.

Further, in the above-mentioned embodiment, a metal tube 54 is used as the cooling air outlet path, but this is not necessarily necessary, and a rubber tube or the like may be used.

Furthermore, in the above-mentioned embodiment, the cooling air is blown approximately perpendicularly to the braking surface on the relatively inner peripheral side of the disc rotor 24.
This is not necessarily necessary; for example, the spray may be applied from the outer circumferential side of the disc rotor 24 toward its axis at a predetermined angle of inclination, or the spray may be applied toward the vicinity of the frictional part between the caliper and the disc rotor 24. It is also possible to spray it directly.

Further, in the above-mentioned embodiments, the case where a disc brake is cooled has been described, but the present invention can also be applied to a case where a drum brake is cooled. In this case, the tube 54
For example, the tip of the backing plate is fixed to a through hole formed at a predetermined position on the outer circumferential side of the backing plate.

In addition, various changes may be made to the present invention without departing from the spirit thereof.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the main parts of a vehicle equipped with a cooling device to which the present invention is applied, and is a partially sectional view. FIG. 2 is an enlarged sectional view of the shock absorber shown in FIG. 1. 10...Cross member, 14...Arm, 24
... Disk rotor, 30 ... Vehicle body, 32 ... Shock absorber, 40 ... Main body, 42 ... Rod, 44 ... Cover part, 48 ... Air chamber, 49
...Communication hole, 50...Suction valve, 51...Hole, 52
...Discharge valve, 54...Tube.

Claims (1)

[Scope of Claim for Utility Model Registration] A main body, a rod provided in the main body so that it can freely protrude, and a rod fixed to the protruding end side of the rod so as to cover the main body from one direction in the axial direction. A vehicle equipped with a shock absorber having a bottomed cylindrical cover portion that is moved relative to the main body portion in a direction toward and away from the main body portion according to relative displacement between the sprung member and the unsprung member. A device for cooling a brake device, comprising: an air chamber formed within the cover portion and whose volume is changed according to relative displacement between the sprung member and the unsprung member; the air chamber and the brake device; A cooling air outlet path is provided between the air chamber and guides air for cooling the brake device from the air chamber to the brake device; and an intake path is provided to communicate air between the air chamber and the atmosphere. an intake valve mechanism that allows air to flow in but prevents air from flowing out from the air chamber; and an intake valve mechanism that is provided in the cooling air outlet passage and that allows air to flow from the air chamber but prevents air from flowing into the air chamber. 1. A cooling device for a vehicle brake device, comprising: a discharge valve mechanism that prevents the inflow of water.