KR920006694B1 - Method and apparatus for reducing sound emanation from a drive system - Google Patents

Abstract

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Description

Transmission belt sound insulation

1 is a schematic diagram of an internal structure of a transmission belt soundproofing device according to an embodiment of the present invention.

Figure 2 is an explanatory view of the open state of the inlet and outlet in the thin wall of the soundproof box receiving box.

3 is a schematic of the apparatus used in the experiment.

* Description of the main parts of the drawings

1: Transmission belt 2,3: Pulley

4: Thin wall 5: Vertical stabilizer pin

6: air inlet port 7: air outlet port

8: pipe 9: silencer

10: receiving box

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission belt, and more particularly to a soundproofing device for a high load transmission belt when driving and cooling the belt.

Recently, high load transmission belts have been widely used in accordance with the increase in performance of automobiles and the like. When the load on the belt increases, high strength is required in the lateral direction of the belt. However, if the strength is excessively increased to meet this purpose, a disadvantage arises in that the noise is increased due to the collision between the belt and the pulley or the deflection of the belt.

To eliminate this drawback, the transmission system including the belt and pulley must be covered and isolated with a protective plate, but the belt weakens due to the heat generated by the internal temperature rise when the belt transmits high loads, even if the belt and pulley are simply protected and sealed. There have been shortcomings that result in loss of durability, and until now, good soundproofing devices for sufficiently preventing noise have not been developed.

Accordingly, it is an object of the present invention to eliminate the above drawbacks and disadvantages so as to soundproof while suppressing the temperature rise by providing an inlet and an outlet for inhaling and discharging air at an effective position without completely surrounding the belt and pulleys, even for high load transmission. It is to provide a transmission belt sound insulation device that can provide a protection mechanism having a sound insulation device that effectively prevents noise.

According to one aspect of the present invention, there is provided a transmission system formed by hanging a belt between at least one pair of pulleys having pins on a side thereof, and is covered and shielded with a thin wall. An air inlet having an air inlet and one having a fan for forced intake, the other being an outlet having a fan for forced exhaust, the air inlet being installed openly on the side of the pulley and the outlet being the pin of the pulley. It is provided in the direction and location to be blown, and also connected to each pipe and at the same time, the silencer of the transmission belt characterized in that the silencer is attached to the inner wall of the pipe and the thin wall, respectively.

In the apparatus, the air inlet is open on the side of the pulley with a vertical stabilizing pin that protrudes to perform the air intake effect most efficiently and is arranged in a thin wall, and the air outlet is vertically stabilized to increase the air exhaust effect most efficiently. It is arranged in the direction and position for blowing air with the pin.

The position of the air outlet is usually located at the position on each pulley.

In addition, air inlets and outlets are provided in the receiving boxes to disperse the noises while discharging the air from the receiving boxes so that the noises are suppressed, while at the same time preventing the weakening of the belt due to heat rise and heat in thin walls.

The air inlet and outlet may be formed in one or more large numbers without being limited to one.

It is better to connect pipes at the inlets and outlets or to provide ventilators in the pipes for efficient intake and discharge of air at the air inlets and outlets. It is also effective to attach the muffler to the inner wall of the thin wall of the receiving box or to the inner wall of the pipe combined with the outlet to reduce noise leakage to the outside.

In this case, the muffler may use a foamable resin containing a tacky synthetic resin component, fiberglass, rock wool or rock felt.

When operating the belt in the above-mentioned device, the noise and deflection of the belt between the pulleys are protected by the thin wall cover of the receiving box, which not only eliminates the external dispersion of noise, but also removes the intake of external air through the inlet, The discharge of the internal air through is repeated. In the meantime, the heat of the pulley is dissipated through the vertical stabilizing pins formed in the pulley and cooled by the suction of external air, thereby being discharged by the discharge of air to remove the heat retained in the thin wall of the receiving box.

Therefore, the apparatus of the present invention can continue to operate for a long time without weakening the transmission belt.

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are schematic diagrams of an embodiment of a transmission belt soundproofing apparatus according to the present invention. In Figures 1 and 2, there is shown a transmission belt 1 in a known manner connecting the opposing pulleys 2,3. The conveying belt 1 and the pulley constitute a transmission system as a whole and are contained in a receiving box formed of a thin wall 4 made of resin or metal having a thickness of 1 to 10 mm. The pulleys 2, 3 can be formed from original V-shaped pulleys, one or both of which are speed conversion pulleys.

The pulleys 2, 3 are usually formed of aluminum, iron or resin and have a plurality of vertical stabilizing pins 5 formed laterally and radially on the side to dissipate heat.

Reference numeral 10 denotes a receiving box. The air inlets 6 are respectively opened at the sides of the pulleys 2 and 3, and the air outlets 7 are formed in the direction of the air flow generated by the vertical stabilizing pins 5 on the pulleys 2 and 3, and the pipes 8 is coupled to the air outlet (7) and the manufacturing machine.

Although not shown in FIGS. 1 and 2, it is preferable to provide a fan at the air inlet 6 and the air outlet 7 of the receiving box 10 to forcibly suck the outside air and forcibly discharge the inside air when necessary.

In FIG. 1, a silencer 9 made of foamable resin or fiber glass is suitably attached to the inner wall of the thin wall 4 and also to the inner wall of the air outlet 7.

The embodiment of the present invention is configured as described above, wherein the outside air is sucked from the inlet to the thin walled transmission system, and the inside air is discharged through the outlet. Therefore, even when the internal air in the receiving box is heated due to the frictional heat of the pulley and the belt when driving the belt, the heat can be properly cooled by the external air, and the air held therein is discharged through the outlet. Therefore, the temperature rise at the thin wall of the receiving box can be prevented.

In addition, since the entire transmission system is coated with a thin wall, less noise is leaked to the outside to perform the noise suppression effect, and efficient and smooth belt transmission is continued for a relatively long time.

In FIG. 3, a driving pulley Dr having a diameter of 170 mm, a driven pulley Dn having a diameter of 90 mm, and a V-shaped speed converting belt Bt having a length of 850 mm were used and rotated at 4,500 r.p.m. In this structure, the belt By is connected to the pulleys Dr and Dn included in the receiving box 10. The sound pressure and temperature of the belt were then measured under various conditions and the results are shown in Table 1. When the holes A and B were open, it was observed that the sound pressure and the temperature of the belt dropped. In Table 1, 1 represents when the receiving box 10 is closed. 2 indicates when the holes A and B are open. 3 shows when the holes A, B and C, D are opened. 4 indicates when the holes A, B, C, D and E, F are all open.

O: open, X: closed, *: mechanical vibration included

Since the device of the present invention is encapsulated with a thin-walled receiving box provided with air inlet and outlet at the predetermined position described above, the transmission system is externally supported by the thin wall to improve the surrounding environment by reducing external leakage of noise. Since the air outlet is formed in the thin wall and the air inlet is formed on the side of the pulley in the direction of air flow, the air is efficiently Can flow.

In addition, since the pulley has a vertical stabilizing pin that dissipates heat, the heat dissipation effect in the pulley can be greatly improved by discharging the heated air more efficiently as airflow to prevent the belt from weakening due to heat. As a result, durability is easily increased.

In addition, since the silencer is attached to the inner wall of the thin wall of the receiving box, the sound insulation effect can be increased by facilitating the reduction of noise leakage, and since the air flow is forced by the fan, the temperature rise inside the receiving box can be greatly suppressed. have.

Claims (2)

A transmission system consisting of a belt between at least one pair of pulleys with side pins is housed therein and covered and shielded with a thin wall, the thin wall having air inlets in at least two locations, one of which is forced An air inlet 6 with a fan for intake, the other being an outlet 7 with a fan for forced exhaust, the air inlet is provided open to the side of the pulley and the outlet 7 is a pin of the pulley. And a silencer (9) is attached to each of the pipes and the inner wall of the thin wall while being connected to the respective pipes. The transmission belt soundproofing device according to claim 1, characterized in that the air outlet (7) of the receiving box (10) is combined with a pipe.

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