JP2015169014A - Belt cover device of plate compactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a belt cover device of a plate compactor for reducing a size and weight in an excitation shaft cover, and easily replacing the excitation shaft cover.SOLUTION: A belt is wound around a driving pulley installed on a driving shaft driven by an engine mounted on an engine base and a driven pulley 12 installed on an excitation shaft 2c of an exciting body 2. A belt cover 20 of combining an inside cover 21 positioned inside the pulley and an outside cover 22 positioned outside the pulley, is provided as a belt cover for covering the driving pulley, the driven pulley 12 and the belt. A rubber or resin cylindrical elastic excitation shaft cover 34 for covering a clearance between its opening part and the exciting body 2, is installed in the driven pulley side opening part for inserting the excitation shaft 2c of the inside cover 21.

Description

  The present invention relates to a plate compactor that compacts a relatively narrow ground, such as sidewalks and residential land creation, pipe burial work, etc., a drive pulley driven by an engine, and a driven pulley attached to a vibration shaft. The present invention relates to a belt cover device that protects a belt that is hung on a belt.

  In the plate compactor, an engine base is installed on a rolling plate through a vibration isolating member made of rubber, the engine is placed and fixed on the engine base, a drive pulley attached to a drive shaft rotated by the engine, A belt is hung on a driven pulley attached to an excitation shaft, which is an axis of an excitation body placed on the pressure plate, and the excitation plate is rotated by driving the engine to vibrate the rolling plate. And it is a compact compacting machine which installs an exciter body ahead of a rolling plate, increases an amplitude ahead of a rolling plate, generates acceleration ahead, and moves forward with the vibration of a rolling plate.

  In such a plate compactor, for safety, as disclosed in Patent Document 1, a drive pulley, a driven pulley, and a belt that hangs around these pulleys are covered with a cover (hereinafter referred to as a belt cover). . This belt cover is attached to the engine base side. The reason is that the engine base is placed on the compaction plate via the vibration isolation member, and the vibration isolation member is distorted during the compaction operation, and the compaction plate and the engine base are relatively displaced. Since it is not possible to adopt a mounting structure that restrains both the side and the rolling plate side, it is preferable to attach the belt cover to the engine base side with less vibration in order to prevent cracking and cracking of the belt cover. It is.

  FIG. 7 is a cross-sectional view showing a conventional combined structure of the belt cover 20 and the vibrating body 2. In FIG. 7, 2a is a housing of the vibrating body 2, 2b is an eccentric weight, and 2c is both ends of the eccentric weight 2b. 1 is a bearing for rotatably supporting the excitation shaft 2c on the housing 2a, 2e is a cap attached to both ends of the housing 2a with bolts 40, and 12 is an end of the excitation shaft 2c. A driven pulley attached by a bolt 41.

  In order to prevent foreign matter such as pebbles from entering between the housing 2a and the belt cover 20, the housing 2a is provided with a vibration shaft cover 42 formed in a resin circle so as to cover the vibration shaft 2c. It is fitted and attached. The belt cover 20 includes an inner cover 21 and an outer cover 22. The inner cover 21 can be attached and detached while the driven pulley 12 is attached to the vibration shaft 2c. It has a large inner diameter opening 21b.

Japanese Patent No. 4358783

  Since the conventional excitation shaft cover 42 shown in FIG. 7 is attached to the housing 2 a of the oscillator 2, it vibrates with the vibration of the oscillator 2. For this reason, the excitation shaft cover 42 is required to have high rigidity and must be firmly fixed to the housing 2a. The excitation shaft cover 42 is worn by contact with the inner cover 21 of the belt cover 20 and needs to be replaced periodically. As described above, the excitation shaft cover 42 has high rigidity and the housing 2a. Therefore, there is a problem that replacement is not easy. In order to prevent the opening 21b of the inner cover 21 from being exposed even if the vibration generating body 2 vibrates, the vibration shaft cover 42 is arranged in the radial direction considering the vibration from the opening 21b of the movable side cover 21. There is a problem that a large diameter must be secured by the width tx, and the excitation shaft cover 42 becomes large.

  In view of the above problems, an object of the present invention is to provide a belt cover device for a plate compactor having a configuration in which the excitation shaft cover is reduced in size and weight, and the excitation shaft cover can be easily replaced.

The belt cover device for a plate compactor according to claim 1 is:
A driving pulley mounted on a driving shaft driven by an engine mounted on the engine base, a vibration generating member is installed on the rolling plate, an engine base is installed on the rolling plate via a vibration isolating member, and As a belt cover that covers the drive pulley, the driven pulley, and the belt, a belt is wound around a driven pulley that is attached to the vibration generating shaft of the vibration generating body, and an inner cover that is located inside the pulley, and a position that is located outside the pulley. In a belt cover device for a plate compactor comprising a belt cover combined with an outer cover that is attached to the engine base,
A cylindrically-shaped vibration shaft made of rubber or resin that covers an opening provided in the inner cover for passing the vibration shaft and a gap between the inner cover and the vibration generator. A cover is attached to the inner cover.

The belt cover device for a plate compactor according to claim 2 is the belt cover device for a plate compactor according to claim 1,
The diameter of the circular opening provided on the drive pulley side and the driven pulley side of the inner cover is formed larger than the outer diameter of the corresponding drive pulley and driven pulley, respectively, and the inner diameter of the excitation shaft cover Is formed to be larger than the outer diameter of the driven pulley.

The belt cover device for a plate compactor according to claim 3 is the belt cover device for a plate compactor according to claim 1 or 2,
The excitation shaft cover comprises an attachment portion attached to the inner cover, and a cylindrical portion extending from the attachment portion to the excitation body side,
A mounting groove is provided on the outer periphery of the mounting portion, and the mounting groove is fitted to the inner peripheral edge of the opening portion of the inner cover by utilizing the elasticity of the vibration shaft cover. It is characterized by being detachably attached to the inner cover.

The belt cover device for a plate compactor according to claim 4 is the belt cover device for a plate compactor according to any one of claims 1 to 3,
The excitation shaft cover comprises an attachment portion attached to the inner cover, and a cylindrical portion extending from the attachment portion to the excitation body side,
The cylindrical portion is formed in a tapered shape in which the inner diameter and the outer diameter on the side of the vibrator are smaller than the inner diameter and the outer diameter on the belt cover side, respectively.

The belt cover device for a plate compactor according to claim 5 is the belt cover device for a plate compactor according to any one of claims 1 to 4,
The excitation shaft cover comprises an attachment portion attached to the inner cover, and a cylindrical portion extending from the attachment portion to the excitation body side,
The thickness on the vibration body side in the cylindrical portion of the vibration shaft cover is formed thinner than the thickness on the inner cover side.

  According to the first aspect of the present invention, the excitation shaft cover is attached to the inner cover side, and the inner cover is attached to the engine base side. Therefore, compared to the case where the excitation shaft cover is attached to the excitation body side. This reduces the vibration of the inner cover and the shaft cover. For this reason, the rigidity required for the vibration shaft cover is reduced, and the attachment strength to the inner cover can be reduced. For this reason, the vibration shaft cover can be reduced in weight and size, and can be easily attached and detached.

  According to the invention of claim 2, since the inner diameter of the cylindrical portion of the excitation shaft cover is equal to or larger than the outer diameter of the driven pulley, the excitation shaft cover is removed together with the inner cover while the driven pulley is attached to the excitation shaft. This makes it easier to attach and detach the vibration shaft cover.

  According to the invention of claim 3, the mounting groove is provided on the outer periphery of the mounting portion of the vibration shaft cover, and the mounting groove is fitted to the inner peripheral edge of the opening portion of the inner cover so that the vibration shaft cover becomes the inner cover. Since it is attached, the oscillating shaft cover can be easily attached and detached as compared with the case where the oscillating shaft cover is attached using bolts or the like.

  According to the invention of claim 4, the excitation shaft cover is formed in a tapered shape in which the inner diameter and the outer diameter of the cylindrical portion on the vibration generator side are respectively smaller than the inner diameter and the outer diameter on the belt cover side. Even if the vibrating body and the belt cover are relatively displaced in the axial direction and come into contact with each other due to body vibration, the vibrating shaft cover is easily deformed, the damage to the vibrating shaft cover is prevented, and the life is prolonged.

  According to the fifth aspect of the present invention, the thickness of the cylindrical portion of the vibration shaft cover on the side of the vibration generator is formed thinner than the wall thickness on the inner cover side. Even if they are relatively displaced in contact with each other, the excitation shaft cover is likely to be deformed, damage to the excitation shaft cover is prevented, and the life is further extended.

It is a side view which shows one Embodiment of the plate compactor by this invention. It is a top view of the plate compactor of this Embodiment. It is a disassembled perspective view which shows the attachment structure of the belt cover of this Embodiment. It is an exploded top view which shows the attachment structure of the belt cover of this Embodiment. It is sectional drawing which shows the structure of the vibration body and vibration shaft cover of this Embodiment. (A) is an expanded sectional view of the excitation shaft cover of FIG. 5, (B) is a partially enlarged sectional view of (A). It is sectional drawing which shows the structure of the conventional vibration body and the vibration shaft cover.

  1 and 2 are a side view and a plan view, respectively, showing an embodiment of a plate compactor according to the present invention. In FIGS. 1 and 2, reference numeral 1 denotes a rolling plate, and reference numeral 2 denotes a vibrating body attached to the front portion of the rolling plate 1. Reference numeral 3 denotes an engine base. An engine 4 having a crankcase 5 is mounted on the engine base 3. 6 is a fuel tank.

  As shown in the exploded perspective view of FIG. 3, the engine base 3 has side plate portions 3 a formed by being bent downward on the left and right sides thereof. The left and right side plate portions 3a are respectively provided with slits 3b with a space in the front-rear direction. As shown in FIG. 1, an anti-vibration rubber 7 is interposed between the rolling plate 1 and the engine base 3 as a vibration isolating member, and the engine base 3 is coupled to the rolling plate 1 by bolts 8 and nuts (not shown). To do.

  As shown in FIGS. 1 and 2, a drive pulley 11 attached to a drive shaft 10 driven by the engine 4 and a driven pulley 12 attached to a vibration shaft 2 c at the center of the vibration generator 2. When the belt 13 is wound around and the engine 4 is operated, the eccentric weight 2b (see FIG. 5) of the vibration generating body 2 is rotated, thereby generating vibration, and the compaction plate 1 is vibrated. In this embodiment, the vibrator 2 is positioned in front of the center of gravity, and generates a force that causes the plate compactor to travel forward by generating vibrations in front of the entire center of gravity.

  In order to adjust the tension of the belt 13 to a suitable degree, the engine 4 including the crankcase 5 is installed on a position adjusting plate (not shown) that is mounted on the engine base 3 so that the front and rear positions can be adjusted. However, description of the detailed structure is omitted. Reference numeral 15 denotes a transport pipe provided in the engine base 3 for lifting the plate compactor when the plate compactor is loaded on a truck or the like. Reference numeral 16 denotes a handle attached to the rear portion of the engine base 3. The handle 16 is held by an operator to control the movement, position and posture of the plate compactor.

  A belt cover 20 covers the belt 13 together with the driving pulley 11 and the driven pulley 12. As shown in FIGS. 2 and 3, the belt cover 20 includes an inner cover 21 that covers the inner side (engine base 3 side) of the belt 13 and an outer cover 22 that covers the outer side of the belt 13. As shown in the exploded plan view of FIG. 4 and the cross-sectional view of FIG. 5, the inner cover 21 of the present embodiment has a flat plate shape, and the outer cover 22 has a U-shaped cross section.

  As shown in FIGS. 3 and 4, the inner cover 21 has circular openings 21 a and 21 b through which the driving pulley 11 and the driven pulley 12 pass. As shown in FIG. 4, the inner diameters D1 and D2 of these openings 21a and 21b are formed larger than the outer diameters d1 and d2 of the driving pulley 11 and the driven pulley 12, respectively.

  As shown in FIGS. 3 and 4, a bracket 24 for attaching the inner cover 21 is welded to the upper surface of the side portion of the engine base 3, and two bolts for inserting two bolts 25 through the bracket 24 are inserted. While providing the hole 24a, the nut 26 is welded to the back surface of each bolt insertion hole 24a. Then, the inner cover 21 is applied to the bracket 24 and the side plate portion 3a of the engine base 3, and the bolts 25 are inserted into the bolt insertion holes 21c provided in the inner cover 21 and the two bolt insertion holes 24a provided in the bracket 24, respectively. The inner cover 21 is attached to the engine base 3 by screwing and fastening.

  The bracket 24 is welded with a cylindrical nut 27 to which a bolt 30 for attaching the outer cover 22 is screwed. Further, the side plate portion 3a of the engine base 3 is provided with a bolt insertion hole 3c through which a bolt 28 for attaching the outer cover 22 is inserted, and a nut 29 is welded to the back surface of the side plate portion 3a. The outer cover 22 is attached by attaching a cylindrical nut 27 through a through-hole 21d provided substantially at the center of the inner cover 21 so that the inner surface of the outer cover 22 abuts the outer surface of the inner cover 21. The bolt 30 is passed through a bolt insertion hole 22 a provided at substantially the center of the outer cover 22, and is screwed into the cylindrical nut 27 to be fastened, whereby the tip of the cylindrical nut 27 is pressed against the inner surface of the outer cover 22. Further, in order to fix the outer cover 22, a bolt insertion hole 22 c is provided in the mounting piece 22 b provided in the outer cover 22, and the bolt 28 is provided in the bolt insertion hole 22 c and the bolt insertion hole 3 c provided in the side plate portion 3 a of the engine base 3. And is screwed onto the nut 29 and fastened.

  2 and 3, reference numeral 32 denotes a cover that covers the drive shaft 10 to which the drive pulley 11 is attached and the opening 21 a of the inner cover 21. The cover 32 has a hook shape and is used to pass the drive shaft 10 through the center portion. An opening 32a is provided. This cover 32 is attached to the engine base 3 side.

  A vibration shaft cover 34 covers the driven pulley 12 side opening 21b of the inner cover 21 and the vibration shaft 2c. The vibration shaft cover 34 is made of an elastic material made of rubber or resin and has a cylindrical shape. In the present embodiment, as shown in FIG. 4, the inner diameter d3 of the vibration shaft cover 34 is set to be equal to or larger than the outer diameter d2 of the driven pulley 12, so that the driven pulley 12 remains attached to the vibration shaft 2c. The vibration shaft cover 34 can be separated from the vibration body 2 with the vibration shaft cover 34 attached to the cover 20.

  6A is an enlarged cross-sectional view of the vibration shaft cover of the present embodiment, and FIG. 6B is a partially enlarged cross-sectional view of FIG. As shown in FIGS. 6A and 6B, the excitation shaft cover 34 includes an attachment portion 34a to the inner cover 21 and a cylindrical portion 34b extended to the excitation body 2 side. The vibration shaft cover 34 may be attached with bolts and nuts. However, in this embodiment, the outer periphery of the attachment portion 34a is made easier to attach and detach the vibration shaft cover 34 to the inner cover 21. The mounting groove 34c is provided on the entire circumference, and this mounting groove 34c is fitted to the inner peripheral edge of the opening 21b of the inner cover 21 by utilizing the elasticity of the vibration shaft cover 34, so that the vibration shaft cover 34 is moved to the inner side. The example attached to the cover 21 is shown.

  The cylindrical portion 34b of the excitation shaft cover 34 has a tapered flange portion. That is, as shown in FIG. 6A, the inner diameter d3 of the cylindrical portion 34b on the side of the vibration generator 2 is smaller than the inner diameter d4 on the side of the inner cover 21, and the outer diameter d5 on the side of the vibration generator 2 is smaller than that on the inner cover 21 side. It is formed smaller than the outer diameter d6. Further, as shown in FIG. 6B, the thickness t1 on the side of the vibration generator 2 of the cylindrical portion 34b of the vibration shaft cover 34 is formed smaller than the thickness t2 on the inner cover 21 side.

  In this configuration, when the belt 13 needs to be replaced, the outer cover 22 is removed from the inner cover 21 and the engine base 3 by removing the bolts 28 and 30. Then, when the handle 16 is pushed down with the front end portion of the rolling plate 1 on the ground and the rear portion floating, the vibration isolating member 8 connecting the rolling plate 1 and the engine base 3 is bent, The distance between the driving pulley 11 and the driven pulley 12 is shortened, the belt 13 is slackened, and the belt can be removed from the pulleys 11 and 12. Also, when a new belt 13 is attached, it is hung around the pulleys 11 and 12 in a posture in which the rear portion of the rolling plate 1 is floated as described above. As described above, when the belt 13 is replaced, the belt 13 can be replaced simply by attaching and detaching the outer cover 22 while the inner cover 21 is attached to the engine base 3.

  In the present embodiment, the excitation shaft cover 34 is attached to the inner cover 21 side. Since the inner cover 21 is attached to the engine base 3 side, vibration is generated as compared with the case where it is attached to the excitation body 2 side. Becomes smaller. For this reason, the rigidity required for the vibration shaft cover 34 is low, and the attachment strength to the inner cover 21 is also small. For this reason, the vibration shaft cover 34 can be reduced in size and weight, and can be easily attached to and detached from the inner cover 21.

  In carrying out the present invention, when exchanging the excitation shaft cover 34, after removing the driven pulley 12, the old excitation shaft cover 34 is cut with the excitation shaft cover 34 attached to the inner cover 21. It may be removed by such means. However, in the present embodiment, since the inner diameter d3 of the excitation shaft cover 34 is set to be equal to or larger than the outer diameter d2 of the driven pulley 12, the excitation shaft cover 34 is kept inside while the driven pulley 12 is attached to the excitation shaft 2c. It can be removed and attached together with the cover 21, and the exciter shaft cover 34 is further easily attached and detached.

  On the other hand, in the case of the conventional structure shown in FIG. 7, the excitation shaft cover 42 is attached to the excitation body 2, so that the excitation shaft cover 42 faces the inner cover 21 side in consideration of the vibration of the excitation body 2. In order to prevent the surface 42a from being detached from the inner cover 21 in the radial direction of the vibration shaft cover 42, the vibration shaft 2c of the vibration shaft cover 42 is passed through in order to ensure the radial width of the surface 42a. Therefore, the opening 42b for this purpose must be made smaller than the outer diameter of the driven pulley 12. For this reason, the excitation shaft cover 42 can be removed only after the driven pulley 12 is removed from the excitation shaft 2c.

  On the other hand, in the present embodiment, by making the inner diameter d3 of the vibration shaft cover 34 equal to or larger than the outer diameter d2 of the driven pulley 12, the driven pulley 12 remains attached to the vibration shaft 2c as described above. The excitation shaft cover 34 can be removed or attached. Here, when the driven shaft 12 can be attached and detached while the driven pulley 12 is attached to the vibration shaft 2c, the inner diameter d3 of the vibration shaft cover 34 is larger than the outer diameter d2 of the driven pulley 12. The inner diameter d3 of the excitation shaft cover 34 may be a value when the inside of the excitation shaft cover 34 is extended to the outside in the radial direction in consideration of the elasticity of the excitation shaft cover 34.

  Further, in the present embodiment, the mounting groove 34c is provided on the outer periphery of the mounting portion 34a of the vibration shaft cover 34 over the entire periphery, and this vibration groove 34c is provided on the inner peripheral edge of the opening 21b of the inner cover 21. Since the excitation shaft cover 34 is attached to the inner cover 21 by using the elasticity of 34, the excitation shaft cover 34 is compared with the case where the excitation shaft cover 34 is attached using bolts or the like. It becomes easy to attach and detach.

  Furthermore, in the present embodiment, the cylindrical portion 34b of the vibration shaft cover 34 is formed in a tapered shape so that the vibration body 2 side has a small diameter, so that the vibration shaft cover 34 is a cap of the vibration body 2. Even if the vibrating body 2 vibrates in the axial direction in contact with 2e, the cylindrical portion 34b of the vibrating shaft cover 34 is likely to be deformed, preventing damage to the vibrating shaft cover 34 and extending the life.

  Furthermore, according to the present embodiment, the wall thickness t1 on the vibration body 2 side of the cylindrical portion 34b of the vibration shaft cover 34 is formed thinner than the wall thickness t2 on the inner cover 21 side. Even if the vibration generating body 2 and the inner cover 21 are relatively displaced by the vibration of the vibration generating shaft 2, the vibration generating shaft cover 34 is easily deformed, and the vibration generating shaft cover 34 is prevented from being damaged. It becomes.

  When carrying out the present invention, various modifications and additions can be made to the specific structure without departing from the gist of the present invention, not limited to the above embodiment.

1: Rolling plate, 2: Exciter, 2c: Excitation shaft, 3: Engine base, 4: Engine, 5: Crankcase, 10: Drive shaft, 11: Drive pulley, 12: Driven pulley, 13: Belt, 16: Handle, 20: Belt cover, 21: Inner cover, 21a, 21b: Opening, 22: Outer cover, 34: Excitation shaft cover, 34a: Mounting portion, 34b: Cylindrical portion, 34c: Mounting groove

Claims (5)

A driving pulley mounted on a driving shaft driven by an engine mounted on the engine base, a vibration generating member is installed on the rolling plate, an engine base is installed on the rolling plate via a vibration isolating member, and As a belt cover that covers the drive pulley, the driven pulley, and the belt, a belt is wound around a driven pulley that is attached to the vibration generating shaft of the vibration generating body, and an inner cover that is located inside the pulley, and a position that is located outside the pulley. In a belt cover device for a plate compactor comprising a belt cover combined with an outer cover that is attached to the engine base,
A cylindrically-shaped vibration shaft made of rubber or resin that covers an opening provided in the inner cover for passing the vibration shaft and a gap between the inner cover and the vibration generator. A belt cover device for a plate compactor, wherein a cover is attached to the inner cover. In the belt cover apparatus of the plate compactor of Claim 1,
The diameter of the circular opening provided on the drive pulley side and the driven pulley side of the inner cover is formed larger than the outer diameter of the corresponding drive pulley and driven pulley, respectively, and the inner diameter of the excitation shaft cover A belt cover device for a plate compactor, characterized in that the outer diameter of the driven pulley is larger than that of the driven pulley. In the belt cover apparatus of the plate compactor according to claim 1 or 2,
The excitation shaft cover comprises an attachment portion attached to the inner cover, and a cylindrical portion extending from the attachment portion to the excitation body side,
A mounting groove is provided on the outer periphery of the mounting portion, and the mounting groove is fitted to the inner peripheral edge of the opening portion of the inner cover by utilizing the elasticity of the vibration shaft cover. A plate compactor belt cover device detachably attached to an inner cover. In the belt cover apparatus of the plate compactor of any one of Claim 1 to 3,
The excitation shaft cover comprises an attachment portion attached to the inner cover, and a cylindrical portion extending from the attachment portion to the excitation body side,
A belt cover device for a plate compactor, wherein the cylindrical portion is formed in a tapered shape whose inner diameter and outer diameter on the side of the vibrator are smaller than the inner diameter and outer diameter on the belt cover side, respectively. In the belt cover apparatus of the plate compactor of any one of Claim 1 to 4,
The excitation shaft cover comprises an attachment portion attached to the inner cover, and a cylindrical portion extending from the attachment portion to the excitation body side,
A belt cover device for a plate compactor, wherein the thickness of the vibrating body side of the cylindrical portion of the vibrating shaft cover is made thinner than the thickness of the inner cover side.

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