JPS6015244A - Cooling device of brake of vehicle - Google Patents

Abstract

PURPOSE:To perform cooling of a brake reliably, by leading at least a part of cooling air to be sent out by a blower fan of a forced air-cooled engine to the brake. CONSTITUTION:When a blower fan 62 of an engine 12 is revolved along with a crankshaft 48, the open air is sucked into a cover 64 through an air intake 66. Part of the sucked air is discharged outside from an exhaust port 70 through a duct 68 after it has cooled a cylinder 40 and a head 42. The other part of the foregoing sucked air is spouted against a brake drum 96 from an opening 72 and a nozzle 74. Frictional heat, therefore, between the drum 96 of a brake 92 and a brake shoe 12 is irradiated favorably by cooling air abutting against the outside of the drum 96.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brake cooling system for a vehicle, which is applicable to vehicles in which the brakes are insufficiently cooled by wind while traveling, and is suitable for preventing damage to the brakes due to heat.

When the front and sides of the vehicle are covered with a vehicle body cover, such as the rear wheels of a scooter, the wind is less likely to hit the wheels. Therefore, the brakes installed on these wheels may overheat under severe operating conditions, such as when descending a long steep slope. Brakes are required to be free from heat-related failures even in such situations. Possible failures caused by heat include the fade phenomenon of the brake lining or the vapor lock phenomenon in the case of oil-resistant brakes.

The present invention was made in response to such demands, and provides a brake cooling system for vehicles that can reliably cool the brakes and prevent heat-related failures even under severe brake usage conditions. The purpose is to provide equipment.

In order to achieve this objective, the present invention employs an I+air-cooled engine, and cools the brakes with a portion of the engine's cooling air. That is, in a vehicle where the brakes are not sufficiently cooled by the running wind, the engine is forced air-cooled, and at least a portion of the cooling air sent out by the engine's ventilation fan is guided to the brakes. The present invention will be described in detail below based on the illustrated embodiments.

FIG. 1 is a left side view of a two-wheeled scooter to which an embodiment of the present invention is applied, FIG. 2 is a right side view of its power portion, and FIG. 3 is a developed plan view. In FIG. 1, reference numeral 10 indicates a dynamic crab unit with 9 forced air-cooled engines 12. Transmission device 14. It is made integrally with a rear wheel 16, and the front end of this unit is connected to a frame 18 by a pivot shaft 20. A buffer 22 is provided between the rear part of the moving crab knit 10 and the frame 18.
is interposed, and the entire unit 10 swings up and down.

The moving crab knit 10 is covered with a body cover 24 at its front and upper left and right sides. 26 is the driver's seat, 28
is a front wheel, and 30 is a steering handle.

The moving crab knit 10 is constructed as shown in FIGS. Engine 12 is a two-stroke, single-cylinder engine.

Cylinder 40. Cylinder head 42. Piston 44° connecting rod 46. Crankshaft 48. It includes a left-right split crankcase 50 (50a, 50b) and the like.

A flywheel 54 to which a permanent magnet 52 is attached is fixed to the right end of the crankshaft 48, and together with coils 56 and 58 disposed inside the flywheel 54, a magnetro 0 is formed.

A blower fan 62 having a large number of blades is fixed to the flywheel 54, and the fan 62 and the cylinder head 42 are connected to each other.
．． The cylinder 40 is covered by a cover 64. This cover 64 has an air intake port 66 that opens toward the side (right side) of the vehicle body at a position facing the blower fan 62 . A duct 68 (FIG. 1) that guides cooling air after cooling the engine to the outside is connected to the cover 64, and the discharge lower 0 of this duct 68 opens at the lower left of the vehicle body cover 24 (FIG. 1). The cover 64 has the crankcase 50a
A circumferentially long open lower part 2 of the flywheel 54 is formed near the base surface of the flywheel 54, and a nozzle 74 oriented in the direction of a brake 92 of the rear wheel 16, which will be described later, is attached to this open lower part 2.

A known V-belt continuously variable transmission is housed within the transmission case 76 of the transmission device 14. This transmission includes a driving pulley 78 attached to the crankshaft 48, a driven pulley 82 attached to the driven shaft 80, a V-belt 84 wound around the single pulleys 78 and 82, and a centrifugal clutch 86. Equipped with The rotation of the crankshaft 48 is controlled by pulleys 78, 82. The signal is transmitted to the driven shaft 80 via the clutch 86, and at this time, the V-shaped groove spacing of the boot 78, 82 changes depending on the rotational speed of the crankshaft 48, and the gear ratio is automatically controlled. Note that when the rotational speed of the driven pulley 82 becomes lower than the specified rotation speed, the clutch 86 is disengaged and its rotation is no longer transmitted to the driven shaft 8°.

The rotation of driven shaft 80 is transmitted to rear axle 90 via reduction gear 88 .

The rear wheel 16 is fixed to this rear axle 90. 92 in Figure 3
is a well-known drum type rear wheel brake.

A shoe plate 94 fixed to the transmission case 76 of the transmission device 14 and a brake drum 96 fixed to the rear wheel 16.
and has. An anchor pin 98 protruding from the shoe plate 94 and a camshaft 100 passing through the shoe plate 94
A brake shoe 102 is installed between the two. 1
04 is a cam lever fixed to the camshaft 100.

Next, the operation of this embodiment will be explained. When the fan 62 rotates together with the crankshaft 48, outside air is sucked into the cover 64 from the air intake port 66, and a portion of the sucked outside air (cooling air) is transferred to the cylinder 40. After the head 42 is cooled, it passes through the duct 68 and is discharged from the discharge lower 0 to the outside. Also fan 6
A portion of the cooling air sent out by the open lower 2. The liquid is ejected from the nozzle 74 toward the brake drum 96. As a result, the frictional heat between the drum 96 of the brake 92 and the brake shoe 102 is effectively dissipated by the cooling air hitting the outer surface of the drum 96. Therefore, even if the brake 92 generates a large amount of heat under severe usage conditions, heat dissipation is good and thermal failures such as fade phenomenon do not occur.

FIG. 4 is a developed view showing a power unit (IOA) of another embodiment, and FIG. 5 is a sectional view taken along the line V-V.

In this embodiment, the crankcase 50a + s Ob
+ and the ventilation passage 1 in the transmission case 76A of the transmission device 14A.
10 is formed, and a part of the cooling air sent out by the air blower 7-an 62 is guided into the brake 92A through this ventilation passage 110, so that the brake 92A is cooled from inside. 11 in the diagram
2 is a ventilation hole that communicates the ventilation path 110 with the inside of the brake 92A, and 114 is an exhaust hole that exhausts the cooling air that has passed through the inside of the brake 92A to the outside. Note that in this embodiment, ventilation path 1
As shown in FIG. 5, the transmission case 76A portion of No. 10 includes a groove 76a having a U-shaped cross section and a cover 76 that closes this groove 76a.
It is formed by b.

According to this embodiment, a part of the cooling air sent out by the ventilation fan 62 passes through the ventilation passage 1102 and the ventilation hole 112 to the brake 9.
2A to cool the brake 92A, and the exhaust hole 114
is discharged to the outside. Therefore, cooling of the brake 92A becomes even more important.

Note that in FIG. 4, the same parts as in FIG. 3 are given the same reference numerals, so the description thereof will not be repeated.

Although each of the above embodiments is applied to a two-wheeled scooter, the present invention is not limited to this, and the engine and the wheels may not swing together.

According to the embodiment shown in FIGS. 4 and 5, since the +'yV air passage 110 is provided in the transmission case 76, the transmission case 76A can be cooled at the same time, and It also has the effect of preventing thermal deterioration. The present invention allows a portion of the cooling air sent out by the blower fan 62 to pass between the various parts of the V-belt transmission in the transmission case 76.76A, and the cooling air after passing is guided to the brake 92.92A. good. That is, the brake cooling air in the present invention may be part or all of the cooling air after cooling other parts of the vehicle.

Further, the brake to be cooled is not limited to the drum brake as in the above embodiment, but may be a disc brake or the like. Furthermore, the location of the brake is not limited to the one provided on the wheel as in the example, but also the one provided on the axle between two wheels of a 3- or 4-wheeled vehicle, in a position where it is difficult to be exposed to the wind while driving. Good too.

As described above, the present invention directs at least a portion of the cooling air of the forced air-cooled engine to the wheel brakes, so even if the brakes are used harshly in the rain, the cooling is reliably performed, and the brake shoe fade phenomenon or It is possible to prevent troubles caused by heat such as vapor lock phenomenon in the case of hydraulic brakes.

[Brief explanation of drawings]

FIG. 1 is a left side view of a scooter to which the present invention is applied. Figure 2 is a right side view of the dynamic crab knit, Figure 3 is a developed plan view of the dynamic crab knit, Figure 4 is a developed plan view of another embodiment of the dynamic crab knit, and Figure 5 is a sectional view taken along the line v-v. be. 10, IOA... moving crab knit. ] 2. Forced air-cooled engine. 62...Blower fan, 92,92A...Brake. Patent Applicant Yamaha Motor Co., Ltd. Representative Patent Attorney Yama 1) Yu Moon

Claims (1)

[Claims] A vehicle in which the brakes are insufficiently cooled by the running wind, wherein the engine is forced air-cooled, and at least a part of the cooling air sent out by a blower fan of the engine is guided to the brakes. Brake cooling system.