JP2007120439A - Sound insulating jacket and sound insulating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sound insulating jacket and a sound insulating device of a simple structure, capable of saving space and of easy attachment and detachment. <P>SOLUTION: The sound insulating jacket 11 consists of a sheet body 18 having flexibility and sound insulating property and has a solid shape forming a storage space 19, and is provided to cover a hydraulic pump 13 under a condition of storing the hydraulic pump 13 in the storage space 19. Since, a jacket main body 15 which consists of flexible sheet body 18, the same can be formed in a shape following an outer surface of the hydraulic pump 13, can be installed on the hydraulic pump 13, and the sound insulating jacket can be miniaturized. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sound insulation jacket and a sound insulation device that reduce noise generated by a hydraulic device.

  FIG. 16 is a front view showing the pump unit 2 to which the soundproof cover 1 of the first prior art is attached. FIG. 17 is a front view showing the pump unit 2 with the soundproof cover 1 detached. In FIG. 16, the soundproof cover 1 is virtually shown for easy understanding. The pump unit 2 includes an electric motor 3, a hydraulic pump 4, and a coupling 5. A driving force from the electric motor 3 is transmitted to the hydraulic pump 4 through the coupling 5, and the hydraulic pump 4 is driven. When the hydraulic pump 4 is driven, noise is generated from the hydraulic pump 4, and the soundproof cover 1 is used to reduce this noise.

  The soundproof cover 1 is formed in a rectangular parallelepiped shape using a steel plate, a sound absorbing material is provided on the inner surface, and is mounted so as to cover the hydraulic pump 4. As a result, the noise generated from the hydraulic pump 4 is absorbed by the sound absorbing material and further blocked by the steel plate, so that the noise conducted to the outside of the soundproof cover 1 is reduced (see, for example, Patent Document 1).

  FIG. 18 is a front view showing the pump unit 2 to which the soundproof cover 1a of the second prior art is attached. In FIG. 18, in order to facilitate understanding, the soundproof cover 1a is virtually shown. The soundproof cover 1a according to the second conventional technique is configured to cover not only the hydraulic pump 4 but also the entire pump unit 2 like the soundproof cover 1 according to the first conventional technique. Accordingly, the soundproof cover 1a can reduce noise generated from the hydraulic pump 4, and can further reduce noise generated from the electric motor 3 and the coupling 4.

JP 2004-270498 A

  The soundproof cover according to the prior art has a problem of high manufacturing cost because it requires machining in order to combine a can-made product and a sound absorbing material. Further, since the soundproof covers 1 and 1a are made of steel, they are relatively heavy, difficult for the operator to attach and detach, and poor maintainability. Further, since the soundproof covers 1 and 1a are formed in a rectangular parallelepiped shape, there is a problem that an outer shape for covering the hydraulic pump 4 becomes large. In addition, since the soundproof covers 1 and 1a are configured to project the pipe connected to the hydraulic pump 4 to the outside of the soundproof covers 1 and 1a, noise is generated from the connection portion between the pipe and the soundproof covers 1 and 1a. To prevent leakage, the structure is complicated.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a sound insulation jacket and a sound insulation device that can be reduced in size and easily attached and detached with a simple configuration.

The present invention is a jacket body which is formed of a sheet body having flexibility and sound insulation, has a three-dimensional shape in which a storage space is formed, and is provided to cover the hydraulic device in a state where the hydraulic device is stored in the storage space. Including
The jacket main body is a sound insulation jacket having ribs formed by overlapping sheet bodies on a ridge line portion.

In the present invention, the jacket body is formed by joining a plurality of sheet bodies to each other,
The rib is formed by a joining portion to which each sheet body is joined.

  Furthermore, the present invention is characterized in that the sheet bodies are joined by stitching.

Further, in the present invention, the jacket body has a plurality of jacket portions,
Each jacket part is displaceable between an open state that opens the storage space and a closed state that closes the storage space,
Engagement means for mechanically engaging the respective jacket portions in the closed state so as to be engaged and disengaged in a state of being overlapped with each other is provided.

  Furthermore, the present invention is characterized by including a jacket sound absorber that has sound absorbing properties and is provided on the inner surface of the jacket body.

Furthermore, the present invention provides the sound insulation jacket provided to cover the hydraulic device,
A cover body made of a sheet body having flexibility and sound insulation and provided to cover a pipe connected to the hydraulic device, and a cover sound absorber having sound absorption and provided on an inner surface portion of the cover body. It is a sound insulation apparatus provided with the piping cover containing.

Further, in the present invention, the cover body is formed in a flat shape,
The cover sound absorber is provided on one side in the thickness direction of the cover body, and is characterized in that a plurality of cutout grooves extending in substantially parallel to a portion on the opposite side to the cover body are formed.

  According to the present invention, since the jacket body made of a sheet body having sound insulation is used, noise from the hydraulic device can be reduced. Moreover, since the jacket main body which consists of a sheet | seat body which has flexibility is used, it can form in the solid shape which follows the outer surface of a hydraulic apparatus, and can be mounted | worn with a hydraulic apparatus. As a result, the sound insulation jacket can be reduced in size and weight. Moreover, since the jacket main body which consists of a flexible sheet | seat body is used, attachment / detachment of an operator becomes easy. Since the sound insulation jacket is made of a flexible sheet body, the sound insulation jacket can be disposed at a position as close as possible to the outer surface of the hydraulic device. In other words, the storage space can be made as small as possible. As a result, the noise can be reduced before the noise from the hydraulic device is diffused outward.

  Further, the jacket body has ribs formed on the ridge line portion by overlapping the sheet bodies. Since the ribs are formed by superimposing the sheet bodies, the ribs can have higher rigidity than the sheet bodies, and the ribs can make it difficult to deform the sound insulation jacket. Since the rib is formed at the ridge line portion, the three-dimensional shape can be maintained even in the sound insulation jacket using the flexible sheet body. Therefore, since the three-dimensional shape can be held by the rib without using a rigid support or the like, the weight of the sound insulation jacket can be reduced. Therefore, the operator can use a light-weighted sound insulation jacket and can easily attach and detach.

  According to the invention, the jacket body is formed by joining a plurality of sheet bodies to each other, and the rib is formed by a joining portion where the sheet bodies are joined. By joining a plurality of sheet bodies, a three-dimensional sheet body can be easily formed. Moreover, a rib can be formed in the part to join by making the junction part of each sheet | seat body into a ridgeline part.

  Furthermore, according to this invention, since each sheet body is joined by sewing, manufacture is easy. Moreover, the strength of the joint portion can be increased by sewing.

  Furthermore, according to the present invention, the jacket body has a plurality of jacket portions, and each jacket portion is displaceable between an open state and a closed state. Therefore, since the operator can open and close the jacket body, the attaching / detaching operation to the hydraulic device is facilitated. In addition, the sound insulation jacket is provided with engagement means for mechanically engaging the jacket portions in the closed state so as to be engaged and disengaged in a state where the jacket portions overlap each other. Thus, although it is a division structure, since it overlaps and engages by an engaging means, high sound insulation can be maintained.

  Further, according to the present invention, the sound insulating jacket includes a jacket sound absorber that has sound absorbing properties and is provided on the inner surface portion of the jacket body. Therefore, the noise from the hydraulic device can be absorbed by the jacket sound absorber, and the noise prevention effect can be enhanced.

  Furthermore, according to this invention, the sound insulation apparatus is comprised including the said sound insulation jacket and a piping cover. The pipe cover is composed of a sheet body having flexibility and sound insulation, and a cover body provided to cover the pipe connected to the hydraulic device, and a cover having sound absorption and provided on the inner surface portion of the cover body Including sound absorbers. Therefore, since the cover main body which consists of a flexible sheet | seat body is used, a piping cover can be mounted | worn along the outer surface of piping. As a result, the cover sound absorber can be brought into contact with the outer surface of the pipe, and the noise from the pipe can be effectively absorbed to be insulated by the cover body. Therefore, the noise prevention effect can be enhanced by using the sound insulation jacket and the pipe cover.

  Furthermore, according to the present invention, the cover main body is formed in a flat shape, and the cover sound absorber is provided on one side in the thickness direction of the cover main body, and the plurality of notch grooves extending substantially parallel to a portion opposite to the cover main body. Is formed. Since the cover body is formed in a flat shape, the cover body is wound around the pipe and attached. When wound and mounted, a notch groove is formed on one side in the thickness direction which is the inner side when wound and mounted, so that it is possible to easily follow the outer surface of the pipe. Therefore, the noise prevention effect can be enhanced.

  FIG. 1 is a perspective view showing a sound insulation jacket 11 of a sound insulation device 10 according to an embodiment of the present invention. FIG. 2 is a side view showing a state in which the sound insulation jacket 11 is mounted on the hydraulic pump 13 constituting the pump unit 12. In FIG. 2, the sound insulation jacket 11 is virtually shown for easy understanding. The sound insulation device 10 includes a sound insulation jacket 11 and a pipe cover 14. First, the sound insulation jacket 11 will be described, and then the piping cover 14 will be described.

  The sound insulation jacket 11 can be mounted so as to cover the hydraulic pump 13 which is a hydraulic device, and reduces noise from the hydraulic pump 13. In other words, the sound insulation jacket 11 absorbs and blocks the vibration of the air transmitted from the hydraulic pump 13 to prevent leakage of noise to the outside of the sound insulation jacket 11 as much as possible. The sound insulation jacket 11 includes a jacket body 15, a jacket sound absorber 16, and a surface fastener 17.

  The jacket body 15 includes a sheet body 18 having flexibility and sound insulation. The sheet body 18 is realized by, for example, a composite material of a lead fiber nonwoven fabric and a vinyl chloride sheet. The jacket body 15 has a three-dimensional shape in which a storage space 19 is formed, and is provided so as to cover the hydraulic pump 13 in a state where the hydraulic pump 13 is stored in the storage space 19. The jacket main body 15 has ribs 21 formed on the ridge line portion 20 by overlapping the sheet bodies 18.

  In the present embodiment, the jacket body 15 has a three-dimensional shape formed by joining the sheet bodies 18 to each other, and the rib 21 is formed by a joined portion to which the sheet body 18 is joined. In the present embodiment, the sheet body 18 is joined by stitching. The jacket body 15 is formed with a first insertion hole 23 into which a pipe 22 connected to the hydraulic pump 13 can be inserted. Further, the jacket body 15 is formed with a second insertion hole 26 into which a coupling 25 for transmitting power from the electric motor 24 to the hydraulic pump 13 can be inserted. The jacket main body 15 has a plurality of jacket portions 27a and 27b in the present embodiment, and each jacket portion 27a and 27b has an open state in which the storage space 19 is opened and a closed state in which the storage space 19 is closed. Displaceable.

  The surface fastener 17 is an engagement means, and mechanically engages the jacket portions 27a and 27b in the closed state so that the jacket portions 27a and 27b are overlapped with each other so as to be engaged and disengaged. The surface fastener 17 is composed of two belt-shaped fastener portions 28a and 28b, and one fastener portion (hereinafter sometimes referred to as "upper fastener portion") 28a is provided on one jacket portion 27a and the other fastener portion. 28b (hereinafter also referred to as “lower fastener portion”) is provided on the other jacket portion 27b. Countless hooks made of fibers are formed on the surface portion of the upper fastener portion 28a, and countless loops made of fibers are formed on the surface portion of the lower fastener portion 28b. In a state where the surface portions of the fastener portions 28a and 28b are overlapped, when the operator presses in the overlapping direction, the loop and the hook are caught and engaged. The engagement is released by applying a force in a direction in which the fastener portions 28a and 28b are separated from each other.

  The jacket sound absorber 16 has sound absorption properties and is provided on the inner surface portion of the jacket body 15. The jacket sound absorber 16 is realized by, for example, foaming urethane. The jacket sound absorber 16 is provided over the entire surface portion of the jacket body 15 facing the hydraulic pump 13 when the sound insulation jacket 11 is attached to the hydraulic pump 13.

  Hereinafter, the vertical direction is referred to as the vertical direction Y with the sound insulation jacket 11 mounted on the hydraulic pump 13. Of the directions perpendicular to the vertical direction Y of the sound insulation jacket 11, the direction in which the axis of the first insertion hole 23 extends is referred to as the left-right direction Z. A direction perpendicular to the vertical direction Y and the horizontal direction Z is referred to as a front-rear direction X. In other words, the direction in which the axis of the second insertion hole 26 extends is referred to as the front-rear direction X.

  One of the front and rear directions X in which the second insertion hole 26 is formed is referred to as a front X1, and the other is referred to as a rear X2. Of the vertical direction Y, a vertically upward direction is referred to as an upper Y1, and a vertically downward direction is referred to as a lower Y2. Of the left and right directions Z, a direction that proceeds to the left with respect to the front X1 is referred to as a left side Z2, and a direction that proceeds to the right with respect to the front X1 is referred to as a right side Z1.

  FIG. 3 is a perspective view showing one jacket portion 27a. FIG. 4 is a perspective view showing the other jacket portion 27b. Each jacket part 27a, 27b is separated into two in the open state. Each of the jacket portions 27a and 27b is generally formed in a rectangular tube shape with a bottom that opens one side in the vertical direction Y, and a storage space 19 for storing the hydraulic pump 13 is formed therein.

  One jacket portion (hereinafter also referred to as “upper fastener portion”) 27a is formed to open to the lower Y2 and is attached to the upper Y1 from the other jacket portion 27b. The upper jacket portion 27 a is configured by five wall portions that form the storage space 19. The front wall portion 29 extending in the left-right direction Z when viewed from the front X1 is formed in a substantially U shape that opens to the lower side Y2 when viewed from the front X1.

  The upper wall portion 30 extending in the left-right direction Z as viewed from the upper Y1 of the upper jacket portion 27a is provided such that the front X1 end portion is connected to the front Y29 end portion in the upper Y1 direction. Further, the rear wall 34 extending in the left-right direction Z as viewed from the rear X2 of the upper jacket portion 27a is provided with the upper Y1 end connected to the rear X2 end of the upper wall 30.

  The two side wall portions 31 connected to the end portion in the left-right direction Z of the upper wall portion 30 of the upper jacket portion 27a and extending in the up-down direction Y are connected to both the left-right direction Z both ends of the front wall portion 29 and the rear wall portion 34. Provided. Each side wall 31 is formed with a first insertion hole 23. Each first insertion hole 23 is formed in the piping 22 of the hydraulic pump 13 according to the position, and in the present embodiment, the first insertion hole 23 is formed closer to the rear X2 from the front-rear direction X center. Each side wall portion 31 is formed with a convex portion 32 in which the lower Y2 portion of the first insertion hole 23 protrudes downward Y2 from the remaining portion. In other words, each side wall 31 is formed in an approximately L shape when viewed from the outside in the left-right direction Z. Each side wall portion 31 is formed with a slit 33 reaching the first insertion hole 23 in the convex portion 32. The piping 22 can be disposed in the first insertion hole 23 through the slit 33. An upper fastener portion 28a is provided on the inner side surface portion of the side wall portion 31 in the left-right direction Z along the edge portion of the lower portion Y2.

  The other jacket portion (hereinafter, also referred to as “lower jacket portion”) 27b is formed to open to the upper Y1, and is attached to the lower Y2 from the upper jacket portion 27a. The upper jacket portion 27 a is configured by five wall portions that form the storage space 19. The front wall portion 35 extending in the left-right direction Z of the front X1 of the lower jacket portion 27b is formed in a substantially U shape that opens to the upper Y1 when viewed from the front X1.

  The lower wall portion 36 extending in the left-right direction Z as viewed from the lower portion Y2 of the lower jacket portion 27b is provided such that the front X1 end portion is connected to the lower Y2 end portion of the front wall portion 35. The rear wall 38 extending in the left-right direction Z as viewed from the rear X2 of the lower jacket portion 27b is provided with the lower Y2 end connected to the rear X2 end of the lower wall 36.

  Two side wall portions 37 that are connected to the end portion in the left-right direction Z of the lower wall portion 36 of the lower jacket portion 27 b and extend in the up-down direction Y are connected to both end portions in the left-right direction Z of the front wall portion 35 and the rear wall portion 38. Provided. Each side wall portion 37 is provided with a lower fastener portion 28b. The lower fastener portion 28b is a surface portion on the outer side in the left-right direction Z of the side wall portion 37, and is provided at a position engageable with the upper fastener portion 28a when in the closed state. Thus, in the closed state, the upper Y1 edge of the lower jacket portion 27b is arranged in the upper Y1 rather than the lower Y2 edge of the upper jacket portion 27a. In other words, the upper jacket portion 27a and the lower jacket portion 27b are configured to overlap each other at the center portion in the vertical direction Y. By providing the surface fastener 17 in such an overlapping portion, the jacket portions 27a and 27b can be engaged by pressing the portion where the surface fastener 17 is provided in the closed state. Further, since the portion where the slit 33 is close is engaged by the surface fastener 17, undesired displacement such as opening of the slit 33 is prevented. In the closed state, the front wall portions 31 and 35 of the jacket portions 27a and 27b are formed in a substantially U shape, so that the second insertion hole 26 having a round edge as viewed from the front X1 is formed. Is done. The size of the second insertion hole 26 is set so that the outer peripheral surface of the coupling 25 abuts closely.

  FIG. 5 is a development view showing one jacket portion 27a. The upper jacket portion 27a, which is one jacket portion 27a, includes a single sheet body 18, and includes a plurality of, in the present embodiment, three sheet portions 18a, 18b, and 18c. The three seat portions 18a, 18b, 18c extend in the front-rear direction X and are arranged side by side in the left-right direction Z. The seat portions 18a, 18b, and 18c are integrally formed at the center portion in the front-rear direction X. The two sheet portions 18 a and 18 c at both ends in the left-right direction Z become side wall portions 31, respectively. Further, the seat portion 18b at the center in the left-right direction Z becomes the front wall portion 29, the upper wall portion 30, and the rear wall portion 34.

  To form the upper jacket portion 27a from the unfolded state, the front X1 end portion 40a of the two seat portions 18a and 18c at both ends in the left-right direction Z, and the left and right sides of the front X1 of the seat portion 18b in the center in the left-right direction Z The both ends 40b in the direction Z are joined by being overlapped and stitched. In addition, the end portion 39a of the rear X2 of the two seat portions 18a and 18c at both ends in the left-right direction Z and the end portion 39b of the left-right direction Z of the rear portion X2 of the seat portion 18b at the center of the left-right direction Z are overlapped and stitched. Be joined. The joined portion is a part of the ridgeline of the upper jacket portion 27a. Therefore, by joining, the upper jacket portion 27 a has a three-dimensional shape, and the joined portion becomes the rib 21.

  FIG. 6 is a development view showing the other jacket portion 27b. The lower jacket portion 27b, which is the other jacket portion 27b, includes a single sheet body 18, and includes a plurality of, in the present embodiment, three sheet portions 18d, 18e, and 18f. The three seat portions 18d, 18e, and 18f extend in the front-rear direction X and are provided side by side in the left-right direction Z. The seat portions 18d, 18e, and 18f are integrally formed at the center portion in the front-rear direction X. The two sheet portions 18d and 18f at both ends in the left-right direction Z become side wall portions 37, respectively. The seat portion 18e at the center in the left-right direction Z serves as a front wall portion 35, a lower wall portion 36, and a rear wall portion 38.

  In order to form the lower jacket portion 27b from the unfolded state, the end portion 41a of the front X1 of the two seat portions 18d and 18f at both ends in the left-right direction Z and the left and right sides of the front X1 of the seat portion 18e at the center in the left-right direction Z Both ends 41b in the direction Z are joined by being overlapped and stitched. Further, the end portion 42a of the rear X2 of the two seat portions 18d and 18f at both ends in the left and right direction Z and the end portion 42b of the left and right direction Z of the rear portion X2 of the seat portion 18e at the center of the left and right direction Z are overlapped and stitched. Be joined. The part joined in this way is a part of the ridgeline of the lower jacket part 27b. Therefore, by joining, the lower jacket portion 27 b has a three-dimensional shape, and the joined portion becomes the rib 21.

  Next, the piping cover 14 will be described. FIG. 7 is an enlarged perspective view showing a part of the piping cover 14. The piping cover 14 includes a cover main body 43 and a cover sound absorber 44. The cover main body 43 is formed in a flat shape and includes a sheet body 45 having flexibility and sound insulation. The sheet body 45 is realized, for example, by a composite material of a lead fiber nonwoven fabric and a vinyl chloride sheet.

  The cover sound absorber 44 has sound absorbing properties and is provided on the inner surface portion 43 a of the cover main body 43. The cover sound absorber 44 is realized by foaming urethane, for example. The cover sound absorber 44 is provided over the entire surface portion of the cover body 43 facing the pipe 22 in a state where the pipe cover 14 is attached to the pipe 22. The cover sound absorber 44 is provided on one side in the thickness direction of the cover main body 43, and a plurality of cutout grooves 46 extending substantially parallel to the portion on the opposite side of the cover main body 43 are formed. Further, the cover main body 43 and the cover sound absorber 44 are formed in a tapered shape so that the end portion 14a in the direction in which the cutout groove 46 extends is inclined.

  FIG. 8 is a cross-sectional view showing a state in which the pipe cover 14 is attached to the pipe 22. The pipe cover 14 is wound around the pipe 22 and attached to the pipe 22 by a coupling means (not shown) such as a hook and loop fastener. In the state of being attached to the pipe 22, the cover main body 43 is provided facing outward, and the cover sound absorber 44 is provided facing inward. Therefore, the cover sound absorber 44 is provided in contact with the pipe 22. The pipe cover 14 is attached to the pipe 22 so that the tapered end portion 14 a of the pipe cover 14 is an end portion in the axial direction of the pipe 22. The end 14 a of the pipe cover 14 on the hydraulic pump 13 side is formed so as to decrease in diameter as it goes toward the hydraulic pump 13. As a result, the end 14a of the pipe cover 14 on the hydraulic pump 13 side can be brought into close contact with the above-described sound insulation jacket 11, and the gap between the sound insulation jacket 11 and the pipe cover 14 can be made as small as possible. it can. Further, the gap can be further reduced by gently inclining the tapered end portion 14a. The dimension of the piping cover 14 in the axial direction is set to, for example, 0.5 m or more and 1 m or less.

  FIG. 9 is a cross-sectional view of the piping cover 14 as seen from the section line s9-s9 in FIG. The cover sound absorber 44 is provided in contact with the pipe 22 in a state of being attached to the pipe 22. The cover sound absorber 44 is formed with a plurality of cutout grooves 46 extending substantially parallel to the axial direction of the pipe 22 when attached to the pipe 22. Therefore, when the pipe cover 14 is wound around the pipe 22, the vicinity of the notch groove 46 is deformed, and the wall portions facing the circumferential direction of the notch groove 46 are deformed so as to contact each other. As a result, the pipe cover 14 can easily follow the outer surface of the pipe 22 and can be brought into close contact with the pipe 22.

  Next, the effect of noise reduction by the sound insulation device 10 of the present embodiment will be described. FIG. 10 is a front view schematically showing the hydraulic pump 13 equipped with the sound insulation device 10. FIG. 11 is a perspective view showing an example of the hydraulic pump 13 equipped with the sound insulating device 10 as seen from one side. FIG. 12 is a perspective view showing an example of the hydraulic pump 13 equipped with the sound insulating device 10 as viewed from the other side. FIG. 13 is a perspective view showing an example of the hydraulic pump 13 with the sound insulation device 10 removed, as viewed from one side. FIG. 14 is a perspective view showing an example of the hydraulic pump 13 with the sound insulation device 10 removed, as viewed from the other side. As shown in FIG. 10, the noise from the hydraulic pump 13 is measured at four positions, and the noise reduction effect is evaluated based on the average value. There are four positions where noise is measured: a position 1 m away from the electric motor 24 to the front X1, a position 1 m away from the hydraulic pump 13 outward in the left-right direction Z, and a position 1 m away from the hydraulic pump 13 to the rear X2. is there.

  FIG. 15 is a graph showing an example of the result of measuring the noise of the hydraulic pump 13. The horizontal axis of the graph indicates the driving condition of the hydraulic pump 13, and the vertical axis of the graph indicates the noise value. Measured under the same driving conditions, when there is no sound insulation device 10, when only the sound insulation jacket 11 is attached, and when the sound insulation jacket 11 and a piping cover (hereinafter sometimes referred to as "hose cover") 14 are attached. did.

  As shown in FIG. 15, it can be seen that the noise is reduced when only the sound insulation jacket 11 is attached, compared with the case where the sound insulation device 10 is not provided, regardless of the driving conditions. Further, it is recognized that the noise is further reduced when the sound insulation jacket 11 and the hose cover 14 are attached, rather than when only the sound insulation jacket 11 is attached, regardless of the driving conditions. Therefore, it is recognized that the sound insulation device 10 of the present embodiment has an effect of reducing noise.

  As described above, since the sound insulation jacket 11 according to the present embodiment uses the jacket main body 15 including the sheet body 18 having sound insulation, noise from the hydraulic pump 13 can be reduced. Further, since the jacket main body 15 made of the flexible sheet body 18 is used, it can be formed into a three-dimensional shape that follows the outer surface of the hydraulic pump 13 and can be attached to the hydraulic pump 13. As a result, the sound insulation jacket can be reduced in size and weight. Moreover, since the jacket main body 15 which consists of the sheet | seat body 18 which has flexibility is used, attachment / detachment of an operator becomes easy. Since the sound insulation jacket 11 includes the flexible sheet body 18, the sound insulation jacket 11 can be disposed at a position as close as possible to the outer surface of the hydraulic pump 13. In other words, the storage space 19 can be made as small as possible. As a result, the noise can be reduced before the noise from the hydraulic pump 13 is diffused outward.

  Further, by covering only the hydraulic pump 13 with the sound insulation jacket 11, it is possible to prevent the overall size of the pump unit from being increased by being attached to the sound insulation jacket 11. Further, since only the hydraulic pump 13 is covered by the sound insulation jacket 11, no ventilation hole is required, and therefore the outer periphery of the hydraulic pump 13 can be covered without any gap. By eliminating the gap as much as possible in this manner, the jacket sound absorber 16 can be brought into contact with the outer peripheral surface portion of the hydraulic pump 13 to directly suppress the vibration that becomes a noise source. As a result, the generation of noise itself can be suppressed and resonance in the outer space can be prevented.

  Further, in the present embodiment, the jacket body 15 has ribs 21 formed on the ridge line portion 20 by overlapping the sheet bodies 18. Since the ribs 21 are formed by superimposing the sheet bodies 18, the ribs 21 can have higher rigidity than the sheet bodies 18, and the sound insulation jacket 11 can be made difficult to deform by the ribs 21. Since the rib 21 is formed in the ridge line portion 20, even the sound insulation jacket 11 using the flexible sheet body 18 can maintain a three-dimensional shape. Therefore, since the three-dimensional shape can be maintained by the rib 21 without using a rigid support body or the like, the sound insulation jacket 11 can be reduced in weight. Therefore, the operator can use the weight-reduced sound insulation jacket 11 and can easily attach and detach. In the conventional technology, a support structure for supporting the three-dimensional shape is necessary, but the support structure does not directly contribute to the sound insulation effect. In the present embodiment, the number of members such as a support structure that does not contribute directly to the sound insulation effect can be reduced, and thus the weight can be reduced without impairing the sound insulation effect.

  Furthermore, in the present embodiment, the jacket body 15 is formed by joining the sheet bodies 18 to each other, and the ribs 21 are formed by joint portions to which the sheet bodies 18 are joined. By setting the joining portion of the sheet body 18 as the ridge portion 20, the rib 21 can be formed in the joining portion.

  Further, in the present embodiment, each sheet body 18 is joined by being stitched, and therefore, manufacture is easy. Moreover, the strength of the joint portion can be increased by sewing. Therefore, unlike the conventional technique, machining that combines a can-made product and a sound absorber is not necessary, and the manufacturing cost can be reduced.

  Further, in the present embodiment, the jacket main body 15 has a plurality of jacket portions 27a and 27b, and each jacket portion 27a and 27b can be displaced between an open state and a closed state. Therefore, the operator can open and close the jacket body 15, so that the attaching / detaching operation to the hydraulic pump 13 is facilitated. In addition, the sound insulation jacket 11 is provided with a surface fastener 17 that mechanically engages the jacket portions 27a and 27b in the closed state so that the jacket portions 27a and 27b can be engaged and disengaged. Thus, although it is a division structure, since it overlaps and engages with the hook-and-loop fastener 17, it can hold | maintain high sound insulation.

  Further, in the present embodiment, the sound insulation jacket 11 includes a sound absorber 16 and a jacket sound absorber 16 provided on the inner surface portion of the jacket body 15. Therefore, the noise from the hydraulic pump 13 can be absorbed by the jacket sound absorber 16 and the noise prevention effect can be enhanced.

  As the jacket sound absorber 16, one having heat resistance and oil resistance is preferably used. As a result, it is possible to prevent the sound absorbing property of the jacket sound absorber 16 from being impaired due to the scattering of oil from the hydraulic pump 13 and the heat generation of the hydraulic pump 13, thereby facilitating maintenance.

  Furthermore, in the present embodiment, the sound insulation device 10 includes the sound insulation jacket 11 and the piping cover 14. The pipe cover 14 includes a sheet body 45 having flexibility and sound insulation, a cover main body 43 provided to cover the pipe 22 connected to the hydraulic pump 13, and a sound absorbing property, and an inner surface of the cover main body 43. And a cover sound absorber 44 provided in the section. Therefore, since the cover main body 43 including the flexible sheet body 45 is used, the pipe cover 14 can be mounted along the outer surface of the pipe 22. As a result, the cover sound absorber 44 can be brought into contact with the outer surface of the pipe 22, and the noise from the pipe 22 can be absorbed effectively and can be insulated by the cover body 43. Therefore, by using the sound insulation jacket 11 and the pipe cover 14, the noise prevention effect can be enhanced.

  Furthermore, in the present embodiment, the cover main body 43 is formed in a flat shape, and the cover sound absorber 44 is provided on one side in the thickness direction of the cover main body 43 and extends in a substantially parallel manner to a portion on the opposite side of the cover main body 43. A notch groove 46 is formed. Since the cover main body 43 is formed in a flat shape, the cover main body 43 is wound around and attached to the pipe 22. When wound and mounted, the notch groove 46 is formed on one side in the thickness direction which is the inner side when wound and mounted, so that the outer surface of the pipe 22 can be easily copied. Therefore, the noise prevention effect can be enhanced.

  Further, in the present embodiment, each side wall portion 31 of the upper jacket portion 27 a is formed with a slit 33 reaching the first insertion hole 23 in the convex portion 32. By forming the slit 33 in the convex portion 32, the length of the slit 33 can be increased. Thereby, noise leaking from the slit 33 can be reduced by the lower jacket portion 27b. Although the first insertion hole 23 is necessary for inserting the pipe 22 in this way, it is possible to prevent the leakage of noise from the vicinity of the insertion hole as much as possible.

  In the above-described embodiment, the jacket body 15 is configured by one sheet body 18, but is not limited to one sheet, and the jacket body 15 may be configured by using a plurality of sheet bodies 18. Good. The jacket body 15 is formed by joining a plurality of sheet bodies 18 to each other, and ribs 21 are formed by joint portions to which the sheet bodies 18 are joined. By joining a plurality of sheet bodies 18 in this way, a three-dimensional sheet body 18 can be easily formed. Moreover, the rib 21 can be formed in the part to join by making the joining part of each sheet | seat body 18 into the ridgeline part 20. FIG.

  In the above-described embodiment, the hydraulic device is realized by the hydraulic pump 13. However, the hydraulic device is not limited to this. For example, a hydraulic motor or a hydraulic device other than hydraulic pressure such as a hydraulic pump may be used. .

  In the above-described embodiment, the sheet bodies are joined by stitching, but the invention is not limited to this. For example, the sheet bodies may be joined using an adhesive, a hook-and-loop fastener 17 or the like.

  The thickness dimensions of the sheet body, the jacket sound absorber, and the cover sound absorber are preferably selected based on the frequency of noise. As a result, the noise reduction effect can be enhanced.

  In the above-described embodiment, the jacket portions 27a and 27b are configured to be completely separated from each other. However, the present invention is not limited to this and may be configured to be partially separated. For example, the end portion of the rear X2 may be joined, and each jacket portion may be angularly displaced using the rear X2 end portion as an axis to be displaced between an open state and a closed state.

It is a perspective view which shows the sound insulation jacket 11 of the sound insulation apparatus 10 of one Embodiment of this invention. 2 is a side view showing a state in which the sound insulation jacket 11 is mounted on a hydraulic pump 13 constituting a pump unit 12. FIG. It is a perspective view which shows one jacket part 27a. It is a perspective view which shows the other jacket part 27b. It is an expanded view which shows one jacket part 27a. It is an expanded view which shows the other jacket part 27b. 2 is an enlarged perspective view showing a part of a piping cover 14. FIG. FIG. 4 is a cross-sectional view showing a state where a pipe cover 14 is attached to a pipe 22. It is sectional drawing which looked at the piping cover 14 from the s9-s9 cut surface line of FIG. 1 is a front view schematically showing a hydraulic pump 13 equipped with a sound insulation device 10. FIG. It is a perspective view which shows an example of the hydraulic pump 13 which mounted | wore with the sound insulation apparatus 10 seeing from one side. It is a perspective view which shows an example of the hydraulic pump 13 which mounted | wore with the sound insulation apparatus 10 seeing from the other. It is a perspective view which shows an example of the hydraulic pump 13 which removed the sound insulation apparatus 10 from one side. It is a perspective view which shows an example of the hydraulic pump 13 which removed the sound insulation apparatus 10 from the other side. It is a graph which shows an example of the result of having measured the noise of the hydraulic pump. It is a front view which shows the pump unit 2 equipped with the soundproof cover 1 of the 1st prior art. It is a front view which shows the pump unit 2 which removed the soundproof cover 1. FIG. It is a front view which shows the pump unit 2 with which the soundproof cover 1a of the 2nd prior art was mounted | worn.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Sound insulation apparatus 11 Sound insulation jacket 13 Hydraulic pump 14 Piping cover 15 Jacket main body 16 Jacket sound absorber 17 Surface fastener 18, 45 Sheet body 19 Storage space 20 Ridge part 21 Rib 22 Piping 27a, 27b Jacket part 43 Cover main body 44 Cover sound absorber 46 Notch groove

Claims (7)

Comprising a sheet body having flexibility and sound insulation, having a three-dimensional shape in which a storage space is formed, and including a jacket body provided to cover the hydraulic device in a state of storing the hydraulic device in the storage space;
The sound insulation jacket characterized in that the jacket body has ribs formed by overlapping sheet bodies on the ridge line portion. The jacket body is formed by joining a plurality of sheet bodies to each other,
The sound insulation jacket according to claim 1, wherein the rib is formed by a joining portion to which each sheet body is joined.   The sound insulation jacket according to claim 2, wherein the sheet bodies are joined by stitching. The jacket body has a plurality of jacket portions,
Each jacket part is displaceable between an open state that opens the storage space and a closed state that closes the storage space,
4. An engagement means for mechanically engaging the jacket portions in the closed state so as to be engaged and disengaged in a state where the jacket portions are overlapped with each other is provided. Sound insulation jacket as described in one.   The sound-insulating jacket according to claim 1, further comprising a jacket sound-absorbing body that has sound-absorbing properties and is provided on an inner surface portion of the jacket body. The sound insulation jacket according to any one of claims 1 to 5, which is provided so as to cover the hydraulic device,
A cover body made of a sheet body having flexibility and sound insulation and provided to cover a pipe connected to the hydraulic device, and a cover sound absorber having sound absorption and provided on an inner surface portion of the cover body. A sound insulation device comprising a piping cover including the sound insulation device. The cover body is formed in a flat shape,
The sound insulation device according to claim 6, wherein the cover sound absorber is provided on one side in the thickness direction of the cover body, and a plurality of cutout grooves extending substantially parallel to a portion opposite to the cover body are formed.

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