JP6114113B2 - Sound insulation device for hydraulic breaker and hydraulic breaker having the same - Google Patents

Description

  The present invention relates to a hydraulic breaker having a breaker body and a bracket that supports the breaker body, and more particularly, to a sound insulation device that reduces the noise of this type of hydraulic breaker.

  This type of hydraulic breaker has a breaker body and a bracket that supports the breaker body, and a mounting portion on the base end side of the bracket is attached to the arm of the work vehicle. The breaker body has a cylinder at its center in the axial direction, and a back head is connected to the rear end side of the cylinder. A piston is slid into the cylinder to form a known hydraulic striking mechanism. Further, the breaker body has a front head on the front end side, and a chisel is inserted into the front head so as to be able to move back and forth in the axial direction. Then, by supplying pressure oil to the cylinder from the hydraulic supply source of the work vehicle via the switching valve, the piston is moved back and forth in the axial direction, and the rear end of the chisel is hit by the piston.

When crushing is performed with this type of hydraulic breaker, the chisel is pressed against the object to be crushed, and the rear end of the chisel is hit with a piston built in the breaker body. As a result, the chisel generates a compressive stress wave that travels in the direction of the object to be crushed by striking the piston, and the chisel advances in the direction of the object to be crushed so that the object to be crushed can be crushed. .
By the way, the noise generated at the time of crushing work by this type of hydraulic breaker is a serious environmental problem especially in urban areas, and improvement is required. Here, most of the noise of the hydraulic breaker is the hitting sound of the piston hitting the chisel. However, in Patent Document 1, the entire breaker body is covered with a bracket as effective as a noise countermeasure for this type of hydraulic breaker. Thus, a sound insulation device has been proposed in which a sealed structure is provided, and a cushioning member such as a vibration-proof rubber is interposed between the breaker body and the bracket.

  Specifically, in FIG. 3 of Patent Document 1, the breaker body (hydraulic breaker 1) is provided in a bracket (bracket plate 2, distance box 8, 9) having a sealed structure, and the periphery thereof is provided with a buffer member (anti-proof). The shock absorbers 7, 22, and 27) are surrounded by the shock absorbers 7, 22, and 27, and only the chisel (chisel 4) is disposed at the bracket tip portion (that is, the tip end side of the breaker body). 27) is exposed to the outside of the bracket (distance box 9) through an insertion hole formed in the center of the frame 27).

Utility Model Registration No. 3019179 (FIGS. 1 and 3)

Here, in order to prevent a sound leakage state in which the striking sound generated from the breaker body inside the bracket propagates out of the bracket, the outer periphery of the chisel on the air passage that is the sound propagation medium, that is, the tip side of the breaker body It is important to make the clearance between the surface and the inner peripheral surface of the insertion hole of the buffer member as small as possible.
On the other hand, the behavior of the chisel of the hydraulic breaker during crushing work is as described above, with the chisel moving forward and backward on its own axis, so-called dynamic “pickling” movement, and clearance between the front head and the chisel. It is characterized by accompanying rocking. In order to cope with such behavior of the chisel, the cushioning member disposed at the tip of the bracket has wear resistance that minimizes the amount of wear associated with the forward and backward movement of the chisel and elasticity that follows the swing of the chisel. Is required.

On the other hand, in the technique disclosed in Patent Document 1, only the chisel (chisel 4) is inserted into the bracket (distance box) from the insertion hole that is simply formed at the center of the shock-absorbing member (vibration isolation rubber 27) disposed at the tip of the bracket. 9) Since the structure is exposed to the outside, there is still room for improvement in reducing the clearance between the outer peripheral surface of the chisel and the inner peripheral surface of the insertion hole of the buffer member as much as possible.
Furthermore, in addition to the above-mentioned wear resistance and elasticity, the buffer member disposed at the tip of the bracket is also required to prevent foreign substances from entering the bracket. In particular, since the working environment of the hydraulic breaker is carried out in the presence of dust and crushed pieces, it is difficult to simply adopt a rubber material at the location of the buffer member arranged at the tip of the bracket. The material will be selected.

  That is, it can be said that wear resistance and elasticity are in a trade-off relationship in the resin material employed as the buffer member. Therefore, it is difficult to maintain both functions at a high level. If the hardness of the resin material is increased by giving priority to the wear resistance of the buffer member as a sound insulation device for a hydraulic breaker, the resin material may be damaged due to the swing of the chisel, and conversely, the elasticity of the buffer member is prioritized. If the elasticity of the resin material is increased, there is a problem that the progress of wear of the resin material is accelerated. In addition, when the crushing operation using the hydraulic breaker is performed under severe conditions, the bracket tip that is close to the object to be crushed cannot avoid contact with the scattered object such as dust or the object to be crushed. Therefore, the sound insulation device disposed at the tip of the bracket bears the risk of breakage. Therefore, the sound insulation device for a hydraulic breaker is also required to have a simple structure as much as possible so as to facilitate replacement of components.

  Therefore, the present invention has been made paying attention to such a problem, and in a hydraulic breaker having a breaker body and a bracket that supports the breaker body, the impact sound of the piston hitting the chisel is bracketed. It is an object of the present invention to provide a hydraulic breaker sound insulation device capable of suppressing propagation to the outside stably over a long period of time with a relatively simple configuration, and a hydraulic breaker including the same.

In order to solve the above-described problems, a hydraulic circuit breaker sound insulation device according to an aspect of the present invention includes a cylinder in which a piston is slidably fitted, a front head provided on a front end side of the cylinder, and a front head provided with the cylinder. has a chisel which is reciprocally movably inserted in the axial direction, the hydraulic pressure comprises a hydraulic breaker body the chisel by hitting with the piston you forward and backward, and a bracket that surrounds to seal the hydraulic breaker body used in the breaker, a sound insulating device for reducing the noise of the hydraulic breaker is mounted in the space defined between the front end side of the bracket and the front end side than the front head of the hydraulic breaker body, shielding made of resin forming the annular provided so can follow the movement to the swing of the chisel in the radial direction of the chisel with the chisel outer peripheral surface and its inner circumferential surface is in sliding contact Member and a resin centering member for urging the center axis of the sound insulating member while being disposed circumscribe the shielding sound member, the sound insulating resin for restricting the axial movement of the member a regulating member, respectively, characterized in that it has as a separate part.

According to the sound breaker for a hydraulic breaker according to one aspect of the present invention, since the bracket surrounds the hydraulic breaker body so as to hermetically seal, the airtightness is maintained inside and outside the bracket, and the striking sound of the piston hitting the chisel Is prevented from propagating out of the bracket. Therefore, the noise of the hydraulic breaker can be reduced.
According to the sound insulation device according to the aspect of the present invention, the sound insulation member is an annular member whose inner peripheral surface is in sliding contact with the outer peripheral surface of the chisel, and is capable of following and moving the chisel in the radial direction of the chisel. Since it is provided, it is possible to follow the movement of the chisel and the swing of the chisel as described above. Therefore, the sound insulation effect can be stably maintained over a long period of time.

Furthermore, according to the sound insulation device according to the aspect of the present invention, the alignment member that is disposed so as to circumscribe the sound insulation member and urges the sound insulation member toward the center of the shaft, and the axial movement of the sound insulation member The sound insulating member is supported by the aligning member and the regulating member. Therefore, the operation of the sound insulation member can be stabilized, and the airtightness can be improved and the noise can be attenuated.
In addition, according to the sound insulation device according to one aspect of the present invention, the sound insulation member, the alignment member, and the restriction member can be formed of only a resin member, and the mounting structure thereof does not require fastening of a bolt or the like. Since it can be made simple, it is possible to easily replace the sound insulation device.

  Here, in the sound breaker for a hydraulic breaker according to one aspect of the present invention, the sound insulation member is preferably made of ultrahigh molecular weight polyethylene having wear resistance. Such a configuration is excellent in maintaining the sound insulation effect stably over a long period of time because of its excellent wear resistance. Moreover, it is preferable that the sound insulation member is provided with a labyrinth groove on an inner peripheral surface thereof. Such a configuration is suitable for preventing dust from entering the bracket.

  Further, in the sound insulation device for a hydraulic breaker according to one aspect of the present invention, the restriction member is made of urethane foam, and an inner peripheral surface thereof is in sliding contact with the outer peripheral surface of the chisel, and a rear end surface of the sound insulation member and the breaker It is preferable that the sound absorbing member is interposed so as to fill a space defined between the front end surface of the main body (see, for example, first to third embodiments described later). With such a configuration, since the regulating member has both the effect of increasing the airtightness of the bracket and the effect of attenuating the noise itself, the operation of the sound insulating member is very stable, and the airtightness is improved and the noise is attenuated. It is more suitable for improving.

In the sound breaker for a hydraulic breaker according to one aspect of the present invention, the restriction member may be a side seal that is attached to an end surface groove provided on at least the rear end surface of the front and rear end surfaces of the sound insulation member (for example, (Refer to the fourth and fifth embodiments described later). Such a configuration is suitable for providing the regulating member with a simple configuration.
Moreover, in the sound insulation device for a hydraulic breaker according to one aspect of the present invention, it is preferable to further include a protector made of a steel plate member formed so as to cover the front end surface and the outer peripheral surface of the sound insulation member (for example, described later). (Refer to the third embodiment). If it is such a structure, since the protector which is a member with high intensity | strength compared with a resin-made member is provided, it is more suitable when preventing a sound-insulating member from being damaged by dust and a crushing piece.

  Further, in the sound insulation device for a hydraulic breaker according to one aspect of the present invention, the bracket has a mounting seat formed by an annular recess on a surface facing the front end surface of the sound insulation member, and the chisel It further has a urethane foam dust seal interposed so as to fill the space defined between the mounting seat and the front end surface of the sound insulation member while the outer peripheral surface and the inner peripheral surface of the outer peripheral surface are in sliding contact with each other. Is preferable (see, for example, the fourth embodiment described later). With such a configuration, the dust seal can prevent the sound insulation member from being mainly damaged by dust, and can improve the air tightness on the sound insulation device side, so that the sound insulation performance of the sound insulation device can be further improved. Is preferred.

  The hydraulic breaker sound insulation device according to one aspect of the present invention may further include an annular mounting member that is detachably provided on the front end surface of the bracket, and the mounting member is a surface facing the front end surface of the bracket. And a mounting seat formed by an annular recess, and further comprising a set of the sound insulating device in a space defined between the front end surface of the bracket and the mounting seat of the mounting member. This is preferable (see, for example, the second embodiment described later). Such a configuration is suitable for further improving the sound insulation performance because the sound insulation devices are continuously provided.

  The hydraulic breaker sound insulation device according to one aspect of the present invention may further include an annular mounting member that is detachably provided on the front end surface of the bracket, and the mounting member is a surface facing the front end surface of the bracket. A mounting seat formed by an annular recess, and the bracket has the sound insulation device in a space defined between a front end surface of the bracket and the mounting seat of the mounting member. A sound absorbing material made of urethane foam that is interposed between the inner peripheral surface of the chisel and the outer peripheral surface of the chisel in a space defined between the main body and the breaker body, and so as to fill the defined space. It is preferable to have a member (for example, refer to a fifth embodiment described later). With such a configuration, since the sound absorbing member made of urethane foam is interposed so as to fill the defined space, the airtightness inside the bracket can be further improved, so that the sound insulation performance is improved. It is more suitable for making it.

In order to solve the above-described problem, a hydraulic breaker according to an aspect of the present invention includes a cylinder in which a piston is slidably fitted, a front head provided on a tip side of the cylinder, and a shaft in the front head. has a reciprocably inserted to the chisel in the direction, the hydraulic breaker body the chisel by hitting with the piston you forward and backward, a bracket surrounding to seal the hydraulic breaker body, the hydraulic breaker a hydraulic breaker comprising a sound insulation device is mounted in the space defined to reduce the noise of the hydraulic breaker between the distal end side than the front head of the body and the distal end side of the bracket, the sound insulating device, It is a sound insulation device for a hydraulic breaker according to one embodiment of the present invention.
According to the hydraulic breaker according to one aspect of the present invention, since the hydraulic breaker sound insulating device according to one aspect of the present invention is provided, the above-described effects based on the hydraulic breaker sound insulating device according to one aspect of the present invention are achieved. Play.

  As described above, according to the present invention, it is possible to stably suppress the striking sound of the piston striking the chisel out of the bracket over a long period of time with a relatively simple configuration.

It is a side view explaining the example which attached the hydraulic breaker which concerns on this invention to the work vehicle. BRIEF DESCRIPTION OF THE DRAWINGS It is principal part sectional drawing which shows 1st embodiment of the sound insulation apparatus for hydraulic breakers which concerns on this invention, The figure shows the component part of a hydraulic breaker main body front side and a bracket front end side in the cross section along an axis. (Hereinafter the same in other embodiments). It is sectional drawing which shows 2nd embodiment of the sound insulation apparatus for hydraulic breakers which concerns on this invention. It is sectional drawing which shows 3rd embodiment of the sound insulation apparatus for hydraulic breakers which concerns on this invention. It is sectional drawing which shows 4th embodiment of the sound insulation apparatus for hydraulic breakers which concerns on this invention. It is sectional drawing which shows 5th embodiment of the sound insulation apparatus for hydraulic breakers which concerns on this invention.

Embodiments of the present invention will be described below with reference to the drawings as appropriate.
As shown in FIG. 1, the hydraulic breaker 20 of the present embodiment includes a breaker body 1 and a bracket 30 that supports the breaker body 1, and a mounting portion 30 s on the base end side of the bracket 30 is provided on the work vehicle 50. The arm 51 is attached to the tip 51s. The breaker body 1 has a front head (not shown) on the front end side 1s, and a chisel 2 is inserted into the front head so as to be reciprocally movable in the axial direction. Further, the breaker body 1 has a cylinder (not shown) at the center in the axial direction, and a back head (not shown) is connected to the rear end side of the cylinder. A piston (not shown) is slidably fitted in the cylinder to form a known hydraulic striking mechanism. By supplying pressure oil from the hydraulic supply source of the work vehicle 50 to the cylinder via a switching valve, the piston is The rear end of the chisel 2 is hit by a piston.

  Here, the hydraulic breaker 20 is provided so as to surround the periphery of the hydraulic breaker main body 1 so that members constituting the bracket 30 seal the hydraulic breaker main body 1. Further, the hydraulic breaker 20 is provided with a sound insulation device 40 for reducing the noise of the hydraulic breaker in a space defined between the distal end side of the hydraulic breaker body 1 and the distal end side of the bracket 30.

Hereinafter, the sound insulation device 40 of the first embodiment will be described in detail with reference to FIG.
As shown in FIG. 2, the front end portion of the bracket 30, the periphery of the hydraulic breaker body 1 has four side plates 31 that are long rectangular plate members disposed opposite to the side surfaces along the axial direction, The breaker body 1 is surrounded by a front plate 32, which is a plate member having a substantially square shape in plan view, facing the front and rear end faces in the axial direction. In the center of the front plate 32, an insertion hole 32a through which the chisel 2 is inserted is provided. The inner diameter of the insertion hole 32a is set so that the chisel 2 swings due to a so-called dynamic “pick” operation during the crushing operation and the clearance between the front head and the chisel 2 mounted. It is set so as not to contact the inner peripheral surface.

  In the gaps between the breaker body 1 and the side plate 31 and the front plate 32 of the bracket 30, cushioning materials 33 and 34 made of urethane are respectively interposed. That is, the side cushioning material 33 cushions vibrations in the lateral direction of the breaker body 1 (direction intersecting the direction of the axis CL (hereinafter referred to as the axial direction): vertical direction in the figure), and the end surface cushioning material 34 is composed of the breaker. The vibration of the main body 1 in the axial direction (left-right direction in the figure) is buffered. Here, the end face cushioning material 34 disposed opposite to the front end face 1m of the hydraulic breaker body 1 does not cover the entire front end face 1m of the breaker body 1, but the front end side of the hydraulic breaker body 1 and the front end side of the bracket 30. An annular space is formed between the two. The sound insulation device 40 is disposed in this defining space. That is, in the present embodiment, sound insulation is provided in the annular space defined by the rear surface 32r of the front plate 32, the inner peripheral surface 34n of the end surface cushioning material 34, the front end surface 1m of the breaker body 1, and the outer peripheral surface 2g of the chisel 2. A device 40 is provided.

  The sound insulation device 40 includes a sound insulation member 3, a centering member 4, and a sound absorption member 5. Here, all of the sound insulating member 3, the alignment member 4 and the regulating member 5 of the present embodiment are resin members. In the present embodiment, the sound absorbing member 5 corresponds to the “regulating member” described in “Means for Solving the Problems”.

  The sound insulating member 3 is an annular member made of ultrahigh molecular weight polyethylene having excellent wear resistance. The inner peripheral surface 3 n of the sound insulating member 3 is provided so as to be in sliding contact with the outer peripheral surface 2 g of the chisel 2. The sound insulating member 3 is provided so as to be movable in the radial direction of the chisel 2 following the swinging of the chisel 2. The cross-sectional shape along the axial direction of the sound insulating member 3 is set so that the aspect ratio between the axial direction and the radial direction is 1 or more (axial direction / radial direction = 1.65) in order to ensure the seal length in the axial direction. ing. In this example, the sound insulating member 3 is provided with two strips of labyrinth grooves 3a formed by annular recesses in the inner peripheral surface 3n which is a sealing surface, separated in the axial direction.

The alignment member 4 is an annular member made of urethane foam having elasticity. The aligning member 4 is disposed between the outer peripheral surface of the sound insulating member 3 and the inner peripheral surface of the end surface cushioning member 34, and biases the sound insulating member 3 toward the center of the axis CL by its elastic force. . The axial dimension of the aligning member 4 is equivalent to that of the sound insulating member 3.
The sound absorbing member 5 is an annular member made of urethane foam having elasticity. The sound absorbing member 5 is disposed between the rear end face of the sound insulating member 3 and the aligning member 4 and the front end face 1m of the breaker body 1, and mainly restricts the movement of the sound insulating member 3 in the axial direction. The sound insulation member 3 is urged forward by the elastic force. The inner peripheral surface 5 n of the sound absorbing member 5 is provided so as to be in sliding contact with the outer peripheral surface 2 g of the chisel 2, and the outer peripheral surface 5 g of the sound absorbing member 5 is in contact with the inner peripheral surface 34 n of the end surface cushioning material 34.

Next, the operation of the hydraulic breaker 20 and the operation and effect of the sound insulation device 40 provided in the hydraulic breaker 20 will be described.
When the hydraulic breaker 20 performs the crushing operation, the chisel 2 is pressed against the object to be crushed, and the rear end of the chisel 2 is hit with a piston built in the breaker body 1. Thereby, in the chisel 2, the compression stress wave which advances to the direction of a to-be-crushed object generate | occur | produces by the impact with a piston, and crushing can be performed because the chisel 2 advances to the direction of to-be-crushed object.

  Here, the hydraulic breaker 20 is surrounded by four side plates 31 and a front plate 32 so that the bracket 30 hermetically seals the hydraulic breaker body 1. Since the shock-absorbing materials 33 and 34 are respectively interposed, the airtightness is maintained inside and outside the bracket 30, and it is suppressed that the hitting sound of the piston hitting the chisel 2 is transmitted outside the bracket 30. . Therefore, the noise of the hydraulic breaker 20 can be reduced.

In particular, the hydraulic breaker 20 includes the sound insulation device 40 at the tip of the bracket 30. Since the sound insulation device 40 fills the closed space formed by the bracket 30 and the breaker body 1 without any gaps, Propagation of the impact sound generated in the main body 1 to the outside of the bracket 30 is more reliably prevented or suppressed.
Furthermore, according to the sound insulating device 40, the sound insulating member 3 is an annular member whose inner peripheral surface 3n is in sliding contact with the outer peripheral surface 2g of the chisel 2, and moves following the swing of the chisel 2 in the radial direction of the chisel 2. Since it is provided, even if the chisel 2 swings, it can follow it. Therefore, it is not easily damaged, and because it is made of ultra-high molecular weight polyethylene with wear resistance, it has excellent wear resistance, so it can maintain a sound insulation effect stably over a long period of time. it can.

  Further, according to the sound insulating device 40, the aligning member 4 that is circumscribed by the sound insulating member 3 and biases the sound insulating member 3 toward the center of the axis CL, and the axial movement of the sound insulating member 3 are provided. Therefore, the sound insulating member 3 is supported by the aligning member 4 and the regulating member 5. For this reason, the aligning member 4 and the sound absorbing member 5 play a role of always holding the sound insulating member 3 in a normal position, so that the operation of the sound insulating member 3 is very stable. Further, since the sound insulating member 3 is supported by the aligning member 4 and the regulating member 5, it has both the effect of improving the air tightness of the bracket 30 and the effect of attenuating the noise itself, so that the air tightness is improved and the noise is attenuated. It will be excellent.

Further, according to the sound insulating device 40, the sound insulating member 3, the alignment member 4 and the regulating member 5 are resin members, and the mounting structure thereof is a simple one that does not require fastening of bolts or the like. Exchange work can be performed easily.
Further, the sound insulation member 3 has an aspect ratio of 1 or more in the axial direction and the radial direction of the cross-sectional shape to ensure the seal length as much as possible, and furthermore, since the labyrinth groove 3a is provided on the inner peripheral surface, the sound insulation member 3 The performance is even better. In addition, the labyrinth groove 3 a and the sound absorbing member 5 of the sound insulating member 3 also have an action of preventing dust from entering the bracket 30.

Next, a second embodiment of the sound insulation device according to the present invention will be described with reference to FIG. The sound insulation device 40 of the second embodiment is obtained by further adding a set of sound insulation devices 40 to the sound insulation device 40 of the first embodiment.
That is, as shown in FIG. 3, the sound insulation device 40 of the second embodiment is provided with a mounting ring 35 that is an annular member coaxially with the chisel 2 on the front end surface 32 m of the front plate 32. The attachment ring 35 is fastened and fixed by a bolt (not shown). Further, an annular mounting member 36 having an annular convex portion 36k that fits into the inner peripheral surface of the mounting ring 35 from the front of the mounting ring 35 is further mounted. An insertion hole 36 a is formed in the center of the mounting member 36 along the axial direction. The inner diameter of the insertion hole 36 a is equivalent to the insertion hole 32 a of the front plate 32.

  In the mounting member 36 and the mounting ring 35, mounting holes 36h of the ring pin 36b are formed at two positions in the radial direction along the direction orthogonal to the axial direction in the center of the mutually facing surfaces where the inlay is fitted. The mounting member 36 can be easily attached to and detached from the mounting ring 35 by inserting / removing the ring pin 36b into / from the mounting hole 36h.

The mounting member 36 has a mounting seat 36z formed by an annular recess on the surface facing the front end surface 32m of the front plate 32, and the mounting seat 36z of the mounting member 36 has the mounting seat 36z of the first embodiment. A sound insulation device 40 having the same configuration as that of the sound insulation device 40 is provided. That is, the second sound insulation device 40 (sound insulation member 3, alignment member 4, sound absorption member 5) having the same configuration as that of the first embodiment is disposed in a closed space defined by the mounting member 36 and the front plate 32. . Since the configuration of the second sound insulation device 40 is the same as that of the first embodiment, description thereof is omitted.
According to the hydraulic breaker 20 of the second embodiment, since the sound insulation device 40 is continuously provided, the sound insulation performance is extremely high.

Next, a third embodiment of the sound insulation device according to the present invention will be described with reference to FIG. 4 as appropriate. In addition, this embodiment is also demonstrated centering on a difference compared with the sound insulation apparatus 40 of said 1st embodiment.
In this embodiment, instead of omitting the end face cushioning material 34, the side cushioning material 33 extends so as to contact the back surface 32 r of the front plate 32, compared with the first embodiment. The difference is that the alignment member 8 having a very large cross-sectional shape is provided between the front plate 32 and the breaker body 1. Since the aligning member 8 simultaneously presses the sound insulating member 6 and cushions between the bracket 30 and the breaker body 1, the cross-sectional shape is set larger than that of the first embodiment and the strength is also improved. Selected materials.

  Further, in this embodiment, the basic structure of the sound insulating member 6 is the same as that of the first embodiment in that the aspect ratio 1 is set to the above and the labyrinth groove 6a is provided. The difference is that a protector 7 made of a steel plate member having a substantially L-shaped cross-sectional view is provided so as to cover the front end face 6m and the outer peripheral face 6g. Further, a sound absorbing member 9 is provided in a space defined by the rear end surface 6k of the sound insulating member 6, the inner peripheral surface 8n of the aligning member 8, and the front end surface 1m of the breaker body 1. Note that the inner peripheral surface 9n of the sound absorbing member 9 is provided with a gap in the facing direction so as not to contact the outer peripheral surface 2g of the chisel 2. That is, in this embodiment, since the sound insulation member 6 can be firmly pressed to the chisel 2 by the enlarged alignment member 8 and the dust intrusion and sound insulation performance can be exhibited, the sound absorbing member 9 acts as a sound insulation member. Specializing in pushing 6 forward.

  According to the hydraulic breaker 20 of the third embodiment, since the sound protector 6 is provided with the steel protector 7 for improving the strength, the protector 7 can be used in a dusty work environment such as a mine. It is more improved. That is, since the protector 7 that is a member having higher strength than the resin member is provided, the sound insulating member 6 is prevented from being damaged by dust or crushed pieces. Moreover, according to this embodiment, since the sound insulation member 6 can be pressed more firmly to the chisel 2 by the enlarged alignment member 8, dust and crushed pieces are prevented from entering the bracket 30. It has excellent sound insulation performance.

Next, a fourth embodiment of the sound insulation device according to the present invention will be described with reference to FIG. In addition, this embodiment is also demonstrated centering on a difference compared with the sound insulation apparatus 40 of said 1st embodiment.
In the present embodiment, instead of omitting the end face cushioning material 34, the side cushioning material 33 extends so as to contact the back surface 37r of the front plate 37, which is compared with the first embodiment. The difference is that the aligning member 11 having a very large cross-sectional shape is provided between the opposed surfaces of the front plate 37 and the breaker body 1. The insertion hole 37a of the front plate 37 is set similarly to the first embodiment.

  The most characteristic point in the present embodiment is that annular end surface grooves 10h are respectively formed on the front and rear end surfaces 10m and 10r of the sound insulating member 10, and side seals 10b are respectively attached to the end surface grooves 10h. is there. The side seal 10b employs an O-ring, and the side seal 10b regulates the movement of the sound insulating member 10 in the axial direction. That is, in the example of the present embodiment, the side seal 10b corresponds to the “regulating member” described in “Means for Solving the Problems”. In the example of the present embodiment, the sound insulating member 10 is set to have an aspect ratio larger than 1 (axial direction / radial direction = 1.70), and the number of labyrinth grooves 10a provided on the inner peripheral surface is three. ing. In the example of this embodiment, the side seal 10b is mounted on the front and rear end faces 10m and 10r of the sound insulating member 10. However, the side seal 10b is mounted on at least the end face groove 10h provided on the rear end face 10r. If it does, it can be set as the "regulation member" as described in the above-mentioned "means for solving a problem."

  In the present embodiment, a mounting seat 37b is formed on the back surface 37r of the front plate 37 by an annular recess so as to face the front end surface 10m in the axial direction of the sound insulating member 10. The inner peripheral surface of the sound insulating member 10 is in sliding contact with the outer peripheral surface 2g of the chisel 2 between the mounting seat 37b formed on the rear surface 37r of the front plate 37 and the front end surface 10m of the sound insulating device 10. A resin dust seal 12 having an annular shape filling the space to be defined is provided.

  According to the hydraulic breaker 20 of the fourth embodiment, since the dust seal 12 is provided on the front side of the sound insulation member 10, the dust seal 12 can suitably prevent the sound insulation member 10 from being mainly damaged by dust. . Moreover, since this dust seal 12 can improve the airtightness on the sound insulation device 40 side, according to the present embodiment, the sound insulation performance of the sound insulation device 40 can be further improved.

Next, a fifth embodiment of the sound insulation device according to the present invention will be described with reference to FIG. In addition, this embodiment is also demonstrated centering on a difference compared with the sound insulation apparatus 40 of said 1st embodiment.
In the present embodiment, instead of omitting the end face cushioning material 34, the side cushioning material 33 extends so as to contact the rear end face 38 r of the front plate 38. In an annular space defined between the rear end surface 38r of the front plate 38 and the front end surface 1m of the breaker body 1, its own inner peripheral surface 15m is in sliding contact with the outer peripheral surface 2g of the chisel 2, and A sound absorbing member 15 made of urethane foam is provided so as to fill the formed space. The insertion hole 38a of the front plate 38 is set similarly to the first embodiment.

  Further, the present embodiment is different in that an annular mounting member 39 is provided on the front side of the front plate 38 so as to be detachably attached to the chisel 2 by a bolt 39b. The mounting member 39 and the front plate 38 are configured such that the mutual axis lines at the time of mounting coincide with each other by the spigot fitting portion 38k. The mounting member 39 has a mounting seat 39z formed by an annular recess on the surface facing the front end surface 38m of the front plate 38, and the mounting member 39 is formed by the surface facing the mounting seat 39z. A closed space is defined inside. The insertion hole 39a of the mounting member 39 is set in the same manner as the insertion hole 38a of the front plate 38 described above.

The most characteristic point of this embodiment is that no sound insulation device is provided on the rear end surface 38r side of the front plate 38, and the space between the front end surface 38m of the front plate 38 and the mounting seat 39z of the mounting member 39. The sound insulation device 40 is provided in the space defined by
In the sound insulation device 40 of the present embodiment, three labyrinth grooves 13a are provided on the inner peripheral surface 13n of the sound insulation member 13 as in the fourth embodiment. On the outer periphery of the sound insulation member 13, there is provided a rubber aligning member 14 that forms an annular shape that circumscribes the outer peripheral surface 13 g of the sound insulation member 13 and biases the sound insulation member 13 toward the center of the shaft. Note that, in the sound insulation device 40 of this embodiment, as in the fourth embodiment, side seals 13b are respectively attached to annular end surface grooves formed on both end surfaces of the sound insulation member 13, and the side seals 13b serve as the sound insulation member 13. This is a restricting member that restricts the movement of the shaft in the axial direction.

  According to the hydraulic breaker 20 of the fifth embodiment, since the basic configuration of the sound insulation device 40 is provided outside the bracket 30 (that is, the front end surface 38m side of the front plate 38), the sound insulation member 13 can be replaced. It can be done more easily. Further, in the space defined between the rear end surface 38r of the front plate 38 and the front end surface 1m of the breaker body 1, its own inner peripheral surface 15m is in sliding contact with the outer peripheral surface 2g of the chisel 2 and is defined. Since the sound absorbing member 15 made of urethane foam is interposed so as to fill the space, the airtightness inside the bracket 30 can be further improved, so that the sound insulation performance is excellent.

  In the present embodiment, since the sound absorbing member 15 is separately provided inside the bracket 30, the aligning member 14 does not need to be concerned with airtightness and sound absorbing performance. Therefore, in this example, it is specialized in the function of urging the sound insulating member 13 and the material is made of rubber, but it is also possible to enclose grease.

  As described above, according to each of the above-described embodiments, in the hydraulic breaker 20 having the breaker body 1 and the bracket 30 that supports the breaker body 1, the impact sound that the piston strikes the chisel 2 is generated outside the bracket 30. Propagation can be suppressed stably over a long period of time with a relatively simple configuration. The sound breaker for a hydraulic breaker according to the present invention and the hydraulic breaker provided with the same are not limited to the above embodiments, and various modifications can be made without departing from the gist of the present invention. is there. For example, the configurations of the above embodiments can be appropriately combined without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Breaker body 2 Chisel 3, 6, 10, 13 Sound insulation member 3a, 6a, 10a, 13a Labyrinth groove 4, 8, 11, 14 Alignment member 5, 9, 15 Sound absorption member 7 Protector 10b, 13b Side seal 12 Dust seal 20 Hydraulic breaker 30 Bracket 31 Side plate 32, 37, 38 Front plate 32a, 36a, 37a, 38a, 39a Insertion hole 33 End cushioning material 34 Side cushioning material 35 Mounting ring 36, 39 Mounting member 36b Ring pin 37b Mounting seat 39b Bolt 40 Sound insulation device 50 Work vehicle 51 Arm

Claims (10)

A cylinder in which a piston is slidably fitted, a front head provided on the front end side of the cylinder, and a chisel inserted in the front head so as to be capable of reciprocating in the axial direction . a hydraulic breaker body the chisel you forward and backward, the hydraulic breaker body used in a hydraulic breaker and a bracket that surrounds to seal the tip of the distal end side to the bracket than the front head of the hydraulic breaker body a sound insulation device for reducing the noise of the hydraulic breaker is mounted in the space defined between the side,
An annular resin sound insulation member provided so that the outer peripheral surface of the chisel and the inner peripheral surface of the chisel are in sliding contact with each other and capable of following and moving the chisel in the radial direction of the chisel, and disposed in contact with the sound insulation member. and the resin of the aligning member for biasing Rutotomoni the sound insulating member toward the center of the shaft, the insulation and resin regulating member for regulating the axial movement of the member, to have as respective separate components A sound insulation device for hydraulic breakers.   The sound insulation device for a hydraulic breaker according to claim 1, wherein the sound insulation member is made of ultrahigh molecular weight polyethylene having wear resistance.   The sound insulation device for a hydraulic breaker according to claim 1 or 2, wherein the sound insulation member is provided with a labyrinth groove on an inner peripheral surface thereof.   The restricting member is made of urethane foam, and an inner peripheral surface thereof is in sliding contact with the outer peripheral surface of the chisel and fills a space defined between a rear end surface of the sound insulating member and a front end surface of the breaker body. The sound insulating device for a hydraulic breaker according to any one of claims 1 to 3, wherein the sound absorbing member is interposed as described above.   4. The hydraulic breaker according to claim 1, wherein the regulating member is a side seal that is attached to an end surface groove provided at least on a rear end surface of the front and rear end surfaces of the sound insulating member. Sound insulation device.   The sound insulation device for a hydraulic breaker according to any one of claims 1 to 5, further comprising a protector comprising a steel plate member formed so as to cover a front end surface and an outer peripheral surface of the sound insulation member. . The bracket has a mounting seat formed by an annular recess on a surface facing the front end surface of the sound insulation member,
A dust seal made of urethane foam interposed so as to fill a space defined between the mounting seat and the front end surface of the sound insulation member, while the outer peripheral surface of the chisel and the inner peripheral surface of the chisel are in sliding contact with each other. It has, The sound insulation apparatus for hydraulic breakers as described in any one of Claims 1-6 characterized by the above-mentioned. The bracket further includes an annular mounting member that is detachably provided on the front end surface of the bracket, and the mounting member has a mounting seat formed by an annular recess on a surface facing the front end surface of the bracket. Yes,
The space defined between the front end surface of the bracket and the mounting seat of the mounting member further includes a set of the sound insulating devices. 5. A sound insulation device for a hydraulic breaker according to 5 or 6. The bracket further includes an annular mounting member that is detachably provided on the front end surface of the bracket, and the mounting member has a mounting seat formed by an annular recess on a surface facing the front end surface of the bracket. Yes,
In the space defined between the front end surface of the bracket and the mounting seat of the mounting member, the sound insulating device is provided,
Made of urethane foam inserted in a space defined between the bracket and the breaker body so that its inner peripheral surface is in sliding contact with the outer peripheral surface of the chisel and fills the defined space The sound insulation device for a hydraulic breaker according to any one of claims 1 to 3, further comprising a sound absorbing member. A cylinder in which a piston is slidably fitted, a front head provided on the front end side of the cylinder, and a chisel inserted in the front head so as to be capable of reciprocating in the axial direction . defined between the hydraulic breaker body the chisel you forward and backward, a bracket surrounding to seal the hydraulic breaker body, the front end side than the front head of the hydraulic breaker body and the distal end side of the bracket In the hydraulic breaker equipped with a sound insulation device that is mounted in the space and reduces the noise of the hydraulic breaker,
A hydraulic breaker, wherein the sound insulation device is a sound insulation device for a hydraulic breaker according to any one of claims 1 to 9.

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