JP4358783B2 - Vibration compactor belt cover - Google Patents

Description

  The present invention relates to an improvement in a belt cover of a vibration compacting machine that generates vibrations in a vertical direction on a vibration generator by an engine disposed on a compaction plate and compacts a road surface by the compaction plate.

  A conventional belt cover of a vibration compactor has an engine shaft disposed on an engine base supported by an anti-vibration rubber on a compaction plate, and a vibration generator is disposed on the compaction plate. In general, the structure is such that both the pulley and the input shaft pulley of the vibration generator are connected by a belt, and both the pulley and the outside of the belt are covered with a box-shaped belt cover. It was intended to prevent the operator's body and part of the clothes from being caught between the pulley and the belt.

  Recently, it has become a social requirement to suppress the noise generated by the vibration compaction machine as much as possible for the belt cover structure for this purpose. Noise reduction measures are also required for the belt covers constituting the belt.

  Because of this need, the vibration compaction machine belt cover is not equipped with a box that has a completely open inner side facing the engine for the purpose of risk prevention, just like conventional belt covers. In addition, the belt cover is composed of an inner cover supported on the engine side and an outer cover joined to the inner cover so that the rotating pulley and the belt are wrapped inside the inner cover and the outer cover. Although a structure is conceivable, such a structure that wraps the noise generated by the rotation of the pulley and the belt inside the inner cover and the outer cover and does not release it outside is known in fields other than the vibration compactor. ing.

  Furthermore, the belt cover is configured by joining the inner cover and the outer cover so that the noise source is wrapped inside the cover, and a sound absorbing material is provided on the inner surface of the belt cover to Although a structure that actively absorbs noise transmitted to the cover and prevents it from leaking to the outside is also conceivable, belt covers equipped with such noise countermeasures are already known.

JP-A-8-190387 JP 2001-182548 A

  The belt cover of the vibration compacting machine is not formed into a box shape that is open on the inside facing the engine as in the prior art, and an inner cover is provided on the side facing the engine, and the outer periphery of the inner cover is provided. When the outer cover is joined to the pulley so as to wrap the pulley portion, a drum-like space is formed inside by the inner cover and the outer cover.

Thus, when the enclosing structure the pulley part by the inner cover and the outer cover, certainly, the noise of the engine can be confined to the inner and outer in the cover, since the inner cover is fixed to the crankcase of the engine The vibration sound of the engine is directly transmitted to the inner cover, and the vibration of the inner cover is transmitted to the outer cover by vibrating the air in the drum-shaped space, and the vibration of the outer cover is again transmitted through the air in the drum-shaped space. In order to return to the inner cover direction, the reciprocation due to the reflection of the vibration sound is repeated, which causes a problem that a specific resonance sound different from the engine noise is generated.

  For such a problem of the generation of resonance when the belt cover is composed of an inner cover and an outer cover, as known in the prior art, urethane resin or the like is used as a material on the back surface of the outer cover. A method of absorbing the vibration sound transmitted to the outer cover by sticking a sound absorbing material to be considered is conceivable.

  However, simply attaching a sound-absorbing material to the back of the outer cover can eliminate some of the resonance generated in the inner and outer covers, but it will reflect vibration noise between the inner and outer covers. Since a large internal space remains, there is a problem that the resonance generated in the cover cannot be completely eliminated.

  In the present invention, as a means for solving the problems of the conventional vibration compaction machine as described above, a belt cover is constituted by an inner cover and an outer cover, and the joint between the outer cover and the inner cover is formed. , By providing a partition that divides the inside of the cover into the inside and outside, the wide internal space that reflects the vibration noise is reduced, so that the vibration noise transmitted from the engine to the belt cover can be reliably absorbed and muffled The purpose is to provide a belt cover.

In the belt cover according to the present invention, as a specific means for that purpose, the belt cover is constituted by an inner cover supported on the engine side and an outer cover joined to the inner cover. A partition wall in which the inner space of the belt cover is partitioned into an inner side and an outer side is sandwiched and fixed to the joint portion to be joined .

In addition, it is preferable that the partition provided in the joint part is provided with an inverted U-shaped notch part for avoiding an engine output shaft pulley and a belt track part disposed in the belt cover.

  In the partition disposed inside the inner cover and the outer cover, it is preferable that a rubber-based, plastic-based, or asphalt-based damping material layer is integrally bonded to at least one of the front surface and the back surface.

Further, partition walls to be clamped and held in the joint portion is the outer peripheral edge fin shape is protruded outward from the seam portion, between the engine and the belt cover upper, suppress the diffusion of the engine sound It is preferable that the sound insulation wall be provided.

When a bowl-shaped sound insulation wall is protruded outward from the joint portion, a vibration damping material layer can be integrally bonded to at least one surface of this sound insulation wall, preferably the back surface facing the engine. preferable.

  In addition, it is preferable to provide a sound absorbing material layer made of urethane resin on a surface facing the engine output shaft pulley on the back surface of the outer cover.

  According to the belt cover of the present invention, since the partition wall for vertically partitioning the inside of the cover is provided inside the joint portion where the inner cover and the outer cover are joined, the noise of the engine enters the inner cover connected to the engine. Is transmitted to the outer cover before the noise is transmitted from the inner cover to the outer cover, and is amplified by the noise transmitted from the inner cover to the outer cover. Resonance sound can be reduced.

  In this case, when the damping material layer is provided on the partition wall, the damping material layer accurately absorbs and controls the air vibration accompanying the noise introduced into the cover, and can be made difficult to transmit to the direction of the outer cover. . Therefore, when the partition wall itself is provided with a damping material layer in the stage before the noise is transmitted from the inside cover to the outside cover by the partition wall as described above, Since the function of absorbing vibrations can be exhibited, generation of noise and resonance noise in the inner and outer covers can be reliably suppressed by the partition wall.

  Furthermore, when the outer peripheral edge of the partition wall is projected in a bowl shape above the joint between the inner cover and the outer cover, a sound insulation wall is provided between the engine and the belt cover upper part to suppress the diffusion of engine sound. As a result, the vibration noise of the engine is blocked by the sound insulation wall and is directly diffused outside the aircraft, and the generation of noise can be accurately reduced even in this portion.

  For the sound insulation wall projecting in a bowl shape outside this cover, as well as the partition wall in the cover, if a layer of damping material is provided, the damping material layer efficiently absorbs the noise diffused from the engine. Therefore, engine noise can be largely reduced by the partition in the belt cover and the sound insulation wall outside the belt cover.

  The partition walls provided in the inner and outer covers are preferably heavy metal plates, and the damping material provided in the partition walls is made of a rubber-based material, layered on the front side of the partition walls, that is, on the side facing the outer cover. What is necessary is just to be provided in. At this time, if a urethane resin-based sound absorbing material layer is provided on the inner surface of the outer cover, a more preferable noise absorbing effect can be obtained.

  Note that the partition wall is provided with an engine output shaft pulley disposed in the belt cover and an inverted U-shaped notch for avoiding the belt track portion, so that a correct intermediate between the inner cover and the outer cover is provided. It is suitable for controlling noise and vibration sound.

  Next, the configuration of the belt cover of the present invention will be described with reference to the embodiment shown in the drawings. FIG. 1 is a side view of a vibrator compactor in which the configuration of a vibration body portion provided at the lower portion of the machine body is omitted. FIG. 2 is a side view showing the entire shape of the partition wall 7 attached to the inner cover 5 by removing the outer cover constituting the cover 1, and FIG. 2 includes the inner cover 5 as viewed from the direction of line AA in FIG. 1. FIG.

As shown in FIG. 2, the belt cover 1 has a deep dish-shaped inner cover 5 that is directly attached to the output shaft 3 side of the engine 2, and an outer peripheral edge portion 6 a attached to the outer peripheral edge portion 5 a of the inner cover 5. The outer cover 6 is formed of a deep dish-shaped outer cover 6 to be joined together. The inner cover 5 and the outer cover 6 are provided at the joint 4 of the outer peripheral edges 5a and 6a to which the inner cover 5 and the outer cover 6 are joined. A partition wall 7 that divides the inner space of the belt cover formed by the joining into an inner side and an outer side is sandwiched and fixed vertically.

The inner cover 5 is provided with an opening 8 for penetrating the engine output shaft 3 on the connection side with the engine 2. First, the opening 8 is attached and fixed to the side surface of the engine 2, and then output A centrifugal clutch 9 is connected to the shaft 3 so that the clutch 9 is wrapped inside the inner cover 5.

  The outer peripheral edge 6a of the outer cover 6 formed symmetrically with the cover is joined to the outer peripheral edge 5a of the inner cover 5, but before the outer cover 6 is joined, the outer peripheral edge of the inner cover 5 is joined. After the partition wall 7 is disposed in the portion 5a, the outer peripheral edge portion 6a of the outer cover 6 is applied to the outside of the partition wall 7 so that the partition wall 7 is sandwiched between the joint portions 4 of the outer peripheral edge portions 5a and 6a. The bolt 10 is inserted from the outer peripheral edge 6 a of the outer cover 6 toward the inner cover 5.

  Note that a urethane resin-based sound absorbing material layer 16 is provided in advance on the inner side surface of the outer cover 5 to be attached after the partition wall 7 is arranged, so that the outer cover 6 direction through the partition wall 7 in the belt cover 1. The vibration sound transmitted to can be absorbed by the sound-absorbing material layer 16, and noise suppression is made effective.

  The partition wall 7 sandwiched between the inner cover 5 and the outer cover 6 is made of a metal plate having a thickness of about 2 to 5 mm, and is a clutch on the engine output shaft 3 disposed in the belt cover at the center. The pulley 11 and an inverted U-shaped notch 13 for avoiding the track portion of the belt 12 are provided, and at least one of the front surface and the back surface of the surrounding plate surface surrounding the notch 13 is provided. A rubber damping material layer 14a for absorbing vibration applied to the partition walls 7 is integrally bonded.

  The damping material layer 14a provided on the partition wall 7 may be provided on at least one of the front surface and the back surface of the wall surface, and may be provided on both surfaces. Further, as the vibration damping material layer 14a, a vibration damping material layer such as plastic or asphalt may be used in addition to rubber.

  In addition, the partition wall 7 has a part of the outer peripheral edge at the rear side and the upper part of the inner and outer side covers 5, 6 so that the outer peripheral edge part of the inner and outer side covers 5, 6 has a bowl shape outward. The sound insulation wall 15 protruded from the engine 2 is provided, and the noise generated from the engine 2 is reflected directly in the space 17 formed between the engine 2 and the sound insulation wall 15 to be directly emitted to the side of the aircraft. Without being absorbed and insulated in this space.

  The sound insulating wall 15 is provided with a vibration damping material layer 14b similar to that provided on the wall surface in the belt cover 1 on at least one surface, for example, the surface facing the engine 2, so that the engine 2 It is configured to absorb the vibration wave caused by the generated noise so that the silencing effect can be efficiently exhibited.

  In the present invention, the belt cover 1 is constituted by the inner cover 5 and the outer cover 6, so that noise generated when the inside of the cover is formed in a drum shape is separated between the inner and outer covers 5, 6. 7 and the outer peripheral edge of the partition wall 7 projecting outward from the joints of the inner and outer covers 5 and 6 and the sound insulation wall 15 is provided outside the cover. We can expect reliable noise countermeasures at low cost.

The side view showing the shape of the partition attached to the inner cover by removing the outer cover. Sectional drawing of the state including the inner side cover seen from the AA line direction of FIG. A state where a partition including a sound insulation wall is sandwiched between the inner cover and the outer cover The perspective view which removed the outer side cover from the belt cover shown in FIG. 3, and represented the shape of the partition.

Explanation of symbols

1: Belt cover 2: Engine 3: Output shaft 4: Joint portion 5: Inner cover 5a: Inner cover outer peripheral edge 6: Outer cover 6a: Outer cover outer peripheral edge 7: Partition 8: Opening 9: Clutch 10: Bolt 11: Clutch pulley 12: Belt 13: Notches 14a, 14b: Damping material layer 15: Sound insulation wall 16: Sound absorbing material layer 17: Space

Claims (5)

In a vibration compactor for generating vertical vibrations in a vibration generator by an engine arranged on a compaction plate and compacting a road surface by the compaction plate, for covering a belt interposed in an output shaft pulley of the engine The belt cover is composed of an inner cover supported on the engine side and an outer cover joined to the inner cover. The inner space of the belt cover is located on the inner side and the outer side at the joint where the inner cover and the outer cover are joined. A belt cover for a vibration compaction machine, characterized in that a partition wall that is partitioned into a vertical direction is sandwiched and fixed vertically. 2. The vibration compaction according to claim 1, further comprising an engine output shaft pulley disposed in the belt cover and an inverted U-shaped notch for avoiding the belt track portion in a part of the partition wall provided in the joint portion. Machine belt cover.   The belt cover for a vibration compactor according to claim 1 or 2, wherein a vibration damping material layer is provided on at least one surface of the partition walls arranged inside the inner cover and the outer cover. The outer peripheral edge portion of the partition walls to be clamped and held in the joint portion, said by projecting fin shape outward from the seam portion, between the engine and the belt cover upper, suppressing diffusion of the engine sound sound insulating wall A belt cover for a vibration compactor according to any one of claims 1 to 3. Than said seam section, the sound insulating wall which is projected to the fin-like outwardly on at least one surface, vibration compaction machine belt cover according to claim 4 in which the damping material layer is provided.

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