JP7820009B2 - Noise reduction device - Google Patents

Description

The present invention relates to a noise reduction device, and more particularly to an in-vehicle noise reduction device.

An in-vehicle noise elimination device is disclosed, for example, in Patent Document 1. In the noise elimination device of Patent Document 1, not only is the magnetic core divided into upper and lower halves, but the case member that houses the magnetic core is also divided into upper and lower halves.

Patent No. 6735971

In recent years, there has been an increasing demand for heat resistance in on-board noise reduction devices. Hard resins are generally chosen as materials that meet these heat resistance requirements. This makes it difficult to use a hinged structure for the case member that houses the magnetic core, and it is necessary to separate the case into upper and lower halves, as in Patent Document 1.

On the other hand, in-vehicle noise reduction devices are used in conditions of considerable vibration. Therefore, in-vehicle noise reduction devices are required to be vibration resistant so that they will not break or come apart even under such conditions.

The present invention aims to provide a noise reduction device that has a case member separated into upper and lower parts and a structure with high vibration resistance.

The present invention provides a first noise removal device,
A noise elimination device comprising: a magnetic core having a through hole extending in a front-rear direction; and a case member accommodating the magnetic core; and the noise elimination device is used by inserting a conductor into the through hole,
The magnetic core includes a first core and a second core,
each of the first core and the second core has a U-shaped cross section in a vertical plane perpendicular to the front-rear direction,
the case member includes a first case that houses the first core, and a second case that houses the second core and is combined with the first case in a vertical direction perpendicular to the front-rear direction,
the first case has a right lower end portion, a left lower end portion, a first right engaging portion, and a first left engaging portion;
a first right reinforcing portion and a first left reinforcing portion are provided at the right lower end portion and the left lower end portion, respectively;
the second case has a right upper end, a left upper end, a second right engaging portion, and a second left engaging portion;
the right upper end portion and the left upper end portion face the right lower end portion and the left lower end portion, respectively, when the first case and the second case are combined;
a second right reinforcing portion and a second left reinforcing portion are provided at the right upper end portion and the left upper end portion, respectively;
the first right engagement portion and the second right engagement portion constitute a right cantilever snap fit,
the first left engagement portion and the second left engagement portion form a left cantilever snap fit,
one of the first right-side reinforcing portion and the second right-side reinforcing portion is a right-side recess and the other is a right-side protrusion,
one of the first left reinforcing portion and the second left reinforcing portion is a left concave portion and the other is a left convex portion,
the right convex portion is surrounded by the right concave portion in a horizontal plane perpendicular to the up-down direction,
the right protrusion is received in the right recess and reinforces the right cantilever snap fit;
the left convex portion is surrounded by the left concave portion in the horizontal plane,
The left protrusion is received in the left recess to provide a noise eliminator that reinforces the left cantilever snap fit.

The present invention also provides a second noise removal device, which is the first noise removal device,
The left recess provides a noise reduction device that is closed in the horizontal plane.

Furthermore, the present invention provides a third noise removal device, which is the first or second noise removal device,
The noise removal device provides that the right convex portion and the left convex portion are rectangular parallelepiped convex portions.

Furthermore, the present invention provides a fourth noise removal device, which is any one of the first to third noise removal devices, comprising:
The case member is provided with a fixing portion,
The noise removal device may have a through hole formed in the fixing portion that penetrates in the vertical direction and through which a fixing tool is inserted when the noise removal device is fixed to an object.

Furthermore, the present invention provides a fifth noise removal device, which is the fourth noise removal device,
The fixing unit provides a noise removal device in which only one of the first case and the second case is fixed to the object.

Furthermore, the present invention provides a sixth noise removal device, which is the fourth or fifth noise removal device,
the case member has a peripheral surface,
the fixing portion is provided so as to extend from the peripheral surface into the horizontal plane,
The noise removal device may be provided such that the case member has a rib formed thereon that extends from the peripheral surface to the fixing portion.

Furthermore, the present invention provides a seventh noise removal device, which is any one of the first to sixth noise removal devices, comprising:
each of the right cantilever snap fit and the left cantilever snap fit has two engagement structures positioned apart from each other in the front-to-rear direction;
Each of the engagement structures has a hook portion having an elastically deformable plate portion and a claw portion supported by the plate portion, and a hooked portion on which the claw portion is hooked,
the plate portion has a first size in the up-down direction and a second size in a direction perpendicular to the up-down direction,
The first size provides a noise reduction device that is larger than the second size.

Furthermore, the present invention provides an eighth noise removal device, which is any one of the first to seventh noise removal devices, comprising:
The height of the right convex portion is smaller than the depth of the right concave portion,
The height of the left convex portion is smaller than the depth of the left concave portion.

The case member of the noise removal device of the present invention consists of a first case and a second case divided into upper and lower halves. The first and second cases are assembled using a right-side cantilever snap fit and a left-side cantilever snap fit. One of the first and second cases has a right-side recess, and the other has a right-side protrusion. One of the first and second cases has a left-side recess, and the other has a left-side protrusion. The right-side protrusion is surrounded by the right-side recess in the horizontal plane. The left-side protrusion is surrounded by the left-side recess in the horizontal plane. Therefore, the right-side protrusion received in the right-side recess and the left-side protrusion received in the left-side recess are restricted from moving in the horizontal plane, relieving and reinforcing the stress applied to the right-side cantilever snap fit and the left-side cantilever snap fit, respectively.

1 is a perspective view showing a noise removal device according to an embodiment of the present invention; FIG. 2 is a front view showing the noise removal device of FIG. 1; FIG. 3 is a cross-sectional view showing a part of the noise removal device of FIG. 2. 3 is a cross-sectional view showing another part of the noise removal device of FIG. 2. FIG. 2 is a top view showing the noise removal device of FIG. 1; FIG. 2 is a bottom view showing the noise removal device of FIG. 1 . FIG. 2 is a right side view showing the noise removal device of FIG. 1 . FIG. 2 is a left side view showing the noise removal device of FIG. 1 . FIG. 2 is a rear view showing the noise removal device of FIG. 1 . FIG. 2 is an exploded perspective view showing the noise removal device of FIG. 1. FIG. 11 is a front view showing a first case included in the noise removal device of FIG. 10 . FIG. 12 is a left side view showing the first case of FIG. 11 . FIG. 12 is a bottom perspective view showing the first case of FIG. 11 . 14 is an enlarged view showing a portion of the first case surrounded by a dashed line A in FIG. 13 . FIG. 12 is another bottom perspective view showing the first case of FIG. 11 . 16 is an enlarged view showing a portion surrounded by a dashed line B of the first case in FIG. 15. FIG. FIG. 11 is a perspective view showing a second case included in the noise removal device of FIG. 10 . 18 is an enlarged view showing a portion surrounded by a dashed line C of the second case in FIG. 17. 18 is an enlarged view showing a portion surrounded by a dashed line D of the second case in FIG. 17.

Referring to Figures 2 and 10, the noise elimination device 100 according to an embodiment of the present invention includes a magnetic core 700 having a through-hole 705 extending in the front-to-rear direction, and a case member 200 that houses the magnetic core 700. The noise elimination device 100 of this embodiment is used by inserting a conductor (not shown) into the through-hole 705. In this embodiment, the front-to-rear direction is the X direction. Here, the front is the +X direction, and the rear is the -X direction.

As shown in FIG. 10, the magnetic core 700 of this embodiment includes a first core 710 and a second core 720. The first core 710 and the second core 720 are separate from each other.

Referring to FIG. 10, the first core 710 of this embodiment has a U-shaped cross section in a vertical plane perpendicular to the front-to-rear direction. In this embodiment, the vertical plane is the YZ plane. The first core 710 is located above the second core 720 in the up-down direction perpendicular to the front-to-rear direction. In this embodiment, the up-down direction is the Z direction. Here, the up is the +Z direction and the down is the -Z direction.

Referring to FIG. 10, the second core 720 of this embodiment has a U-shaped cross section in a vertical plane perpendicular to the front-to-rear direction. The second core 720 is located below the first core 710 in the up-down direction.

As shown in FIG. 1, the case member 200 has a peripheral surface 210. With reference to FIGS. 2 and 7 to 9, the peripheral surface 210 includes a front surface 212, a rear surface 214, a right side surface 216, and a left side surface 218.

As shown in Figure 2, the front surface 212 in this embodiment faces forward in the front-to-rear direction.

As shown in FIG. 9, the rear surface 214 in this embodiment faces rearward in the front-to-rear direction. The rear surface 214 is located rearward of the front surface 212 in the front-to-rear direction.

As shown in Figure 7, in this embodiment, the right side surface 216 faces right in the left-right direction. In this embodiment, the left-right direction is the Y direction. Here, the right side is the +Y direction and the left side is the -Y direction. As shown in Figure 5, the right side surface 216 is located to the right of the left side surface 218 in the left-right direction. The right side surface 216 is located between the front surface 212 and the rear surface 214 in the front-to-rear direction. The right side surface 216 is located rearward of the front surface 212 in the front-to-rear direction. The right side surface 216 is located forward of the rear surface 214 in the front-to-rear direction.

As shown in FIG. 8, the left side surface 218 in this embodiment faces left in the left-right direction. As shown in FIG. 5, the left side surface 218 is located to the left of the right side surface 216 in the left-right direction. The left side surface 218 is located between the front surface 212 and the rear surface 214 in the front-to-rear direction. The left side surface 218 is located rearward of the front surface 212 in the front-to-rear direction. The left side surface 218 is located forward of the rear surface 214 in the front-to-rear direction.

As shown in Figure 10, the case member 200 of this embodiment comprises a first case 300 and a second case 400.

Referring to FIG. 10, the first case 300 of this embodiment houses the first core 710. The first case 300 is positioned above the second case 400 in the vertical direction. As shown in FIG. 13, the first case 300 has a right-side lower end portion 310, a left-side lower end portion 320, a first right-side engaging portion 330, and a first left-side engaging portion 340.

As shown in Figure 15, the right lower end portion 310 of this embodiment has a right lower surface 311.

As shown in FIG. 15, in this embodiment, the right lower surface 311 faces downward in the vertical direction. The right lower surface 311 is a surface that is perpendicular to the vertical direction.

As can be seen from Figures 13 and 14, in this embodiment, a first right reinforcing portion 312 is provided on the right lower end portion 310.

As shown in Figure 14, the first right-side reinforcing portion 312 in this embodiment is a right-side recess 312. That is, the first right-side reinforcing portion 312 is recessed upward in the vertical direction from the right-side lower surface 311. With reference to Figures 13 and 14, the right-side recess 312 is located near the right end of the first case 300 in the left-right direction. Note that the right-side recess 312 is not closed in a horizontal plane perpendicular to the up-down direction. That is, the right-side recess 312 is partially open in the horizontal plane. The right-side recess 312 is in communication with the outside of the first case 300 in the left-right direction. In this embodiment, the horizontal plane is the XY plane.

As shown in FIG. 14, the right recess 312 has a right upper surface 3122 and a peripheral wall 314.

As shown in FIG. 14, in this embodiment, the right upper surface 3122 faces downward in the vertical direction. The right upper surface 3122 defines the upper end of the right recess 312 in the vertical direction.

As shown in FIG. 14, the peripheral wall 314 has a right front surface 3123, a right rear surface 3124, a right inner surface 3125, and a right outer surface 3126.

As shown in FIG. 14 , the right front surface 3123 in this embodiment faces rearward in the front-to-rear direction. The right front surface 3123 defines the front end of the right recess 312 in the front-to-rear direction. The right front surface 3123 is directly connected to the right inner surface 3125. The right front surface 3123 is not directly connected to the right outer surface 3126. The right front surface 3123 is connected to the right outer surface 3126 only via the right upper surface 3122.

As shown in FIG. 14 , in this embodiment, the right rear surface 3124 faces forward in the front-to-rear direction. The right rear surface 3124 defines the rear end of the right recess 312 in the front-to-rear direction. The right rear surface 3124 is directly connected to the right inner surface 3125. The right rear surface 3124 is not directly connected to the right outer surface 3126. The right rear surface 3124 is connected to the right outer surface 3126 only via the right upper surface 3122.

As shown in FIG. 14, the right inner surface 3125 in this embodiment faces right in the left-right direction. The right inner surface 3125 defines the inner end of the right recess 312 in the left-right direction. The right inner surface 3125 defines the left end of the right recess 312 in the left-right direction. The right inner surface 3125 is directly connected to the right front surface 3123. The right inner surface 3125 is directly connected to the right rear surface 3124.

As shown in FIG. 14 , in this embodiment, the right outer surface 3126 faces left in the left-right direction. The right outer surface 3126 defines the outer end of the right recess 312 in the left-right direction. The right outer surface 3126 defines the right end of the right recess 312 in the left-right direction. The right outer surface 3126 is not directly connected to the right front surface 3123. The right outer surface 3126 is connected to the right front surface 3123 only via the right upper surface 3122. The right outer surface 3126 is not directly connected to the right rear surface 3124. The right outer surface 3126 is connected to the right rear surface 3124 only via the right upper surface 3122.

As shown in Figure 15, the left lower end 320 of this embodiment has a left lower surface 321.

As shown in FIG. 15, in this embodiment, the left lower surface 321 faces downward in the vertical direction. The left lower surface 321 is a surface that is perpendicular to the vertical direction.

As can be seen from Figures 15 and 16, in this embodiment, the left lower end 320 is provided with a first left reinforcing portion 322.

As shown in Figure 16, the first left-side reinforcing portion 322 in this embodiment is a left-side recess 322. That is, the first left-side reinforcing portion 322 is recessed upward in the vertical direction from the left-side lower surface 321. With reference to Figures 15 and 16, the left-side recess 322 is located near the left end of the first case 300 in the horizontal direction. The left-side recess 322 is closed in a horizontal plane perpendicular to the vertical direction.

As shown in FIG. 16, the left recess 322 has a left upper surface 3222 and a peripheral wall 324.

As shown in FIG. 16, in this embodiment, the left upper surface 3222 faces downward in the vertical direction. The left upper surface 3222 defines the upper end of the left recess 322 in the vertical direction.

As shown in FIG. 16, the peripheral wall 324 has a left front surface 3223, a left rear surface 3224, a left inner surface 3225, and a left outer surface 3226.

As shown in FIG. 16 , in this embodiment, the left front surface 3223 faces rearward in the front-to-rear direction. The left front surface 3223 defines the front end of the left recess 322 in the front-to-rear direction. The left front surface 3223 is directly connected to the left inner surface 3225. The left front surface 3223 is directly connected to the left outer surface 3226.

As shown in FIG. 16 , in this embodiment, the left rear surface 3224 faces forward in the front-to-rear direction. The left rear surface 3224 defines the rear end of the left recess 322 in the front-to-rear direction. The left rear surface 3224 is directly connected to the left inner surface 3225. The left rear surface 3224 is directly connected to the left outer surface 3226.

As shown in FIG. 16 , in this embodiment, the left inner surface 3225 faces left in the left-right direction. The left inner surface 3225 defines the inner end of the left recess 322 in the left-right direction. The left inner surface 3225 defines the right end of the left recess 322 in the left-right direction. The left inner surface 3225 is directly connected to the left front surface 3223. The left inner surface 3225 is directly connected to the left rear surface 3224.

As shown in FIG. 16 , in this embodiment, the left outer surface 3226 faces right in the left-right direction. The left outer surface 3226 defines the outer end of the left recess 322 in the left-right direction. The left inner surface 3225 defines the left end of the left recess 322 in the left-right direction. The left outer surface 3226 is directly connected to the left front surface 3223. The left outer surface 3226 is directly connected to the left rear surface 3224.

As described above, the left front surface 3223 is directly connected to both the left inner surface 3225 and the left outer surface 3226, and the left rear surface 3224 is directly connected to both the left inner surface 3225 and the left outer surface 3226. In other words, the left recess 322 has peripheral walls 324 in all directions within the horizontal plane.

As shown in FIG. 13, the first right engagement portion 330 in this embodiment is located at the right end of the right lower end portion 310 in the left-right direction.

As shown in FIG. 13, the first left-side engagement portion 340 in this embodiment is located at the left end of the left-side lower end portion 320 in the left-right direction. The first right-side engagement portion 330 and the first left-side engagement portion 340 are aligned in the left-right direction.

Referring to Figure 10, the second case 400 of this embodiment houses the second core 720. The second case 400 is located below the first case 300 in the vertical direction. Referring to Figures 1 and 10, the second case 400 is combined with the first case 300 in the vertical direction, which is perpendicular to the front-to-rear direction.

Referring to Figures 6 and 17, the second case 400 has a right upper end portion 410, a left upper end portion 420, a second right engagement portion 430, and a second left engagement portion 440.

As shown in FIG. 17, in this embodiment, the upper right end 410 is located to the right of the upper left end 420 in the left-right direction. The upper right end 410 and the upper left end 420 are aligned in the left-right direction. The upper right end 410 defines the right end of the second case 400 in the left-right direction. As shown in FIG. 7, the upper right end 410 faces the lower right end 310 when the first case 300 and the second case 400 are combined.

As shown in FIG. 17, the right upper end 410 has a right upper surface 411.

As shown in FIG. 17, in this embodiment, the right upper surface 411 faces upward in the vertical direction. The right upper surface 411 is a surface perpendicular to the vertical direction. As shown in FIG. 3, when the first case 300 and the second case 400 are combined, the right upper surface 411 contacts the right lower surface 311.

Referring to Figures 17 and 18, the right upper end portion 410 is provided with a second right reinforcing portion 412 and two right holes 414.

18, the second right-side reinforcement portion 412 in this embodiment is a right-side protrusion 412. That is, the second right-side reinforcement portion 412 protrudes upward in the vertical direction from the right-side upper surface 411. The right-side protrusion 412 defines the upper end of the right-side upper end portion 410 in the vertical direction. The right-side protrusion 412 is a rectangular parallelepiped protrusion. That is, the size of the right-side protrusion 412 in the front-to-rear direction is larger than the size in the left-to-right direction. As shown in FIG. 17, the right-side protrusion 412 is located near the right end of the second case 400 in the left-to-right direction. As shown in FIG. 3, when the first case 300 and the second case 400 are combined, the right-side protrusion 412 is received in the right-side recess 312. The height RH of the right-side protrusion 412 is smaller than the depth RD of the right-side recess 312. The right-side protrusion 412 is surrounded by the right-side recess 312 in the horizontal plane. That is, the right-side convex portion 412 is surrounded by the peripheral wall 314 in the horizontal plane. As a result, the right-side convex portion 412 received in the right-side recess 312 is restricted from moving in the horizontal plane. More specifically, the right-side convex portion 412 received in the right-side recess 312 is restricted from moving in all directions in the horizontal plane. As shown in FIG. 7 , when the noise removal device 100 is viewed from the right in the left-right direction, part of the right-side convex portion 412 is visible.

As described above, the right recess 312 is not closed in the horizontal plane. However, the present invention is not limited to this, and the right recess 312 may be closed in the horizontal plane. In other words, the right recess 312 may have a peripheral wall 314 in all directions in the horizontal plane. By configuring the right recess 312 in this manner, it is possible to more firmly restrict the movement of the right protrusion 412 received in the right recess 312 in all directions in the horizontal plane.

As described above, when the first case 300 and the second case 400 are combined, the right-side protrusion 412, which is a rectangular parallelepiped protrusion, is received in the right-side recess 312. This ensures a large total surface area for the opposing faces of the right-side recess 312 and right-side protrusion 412 in a limited space.

As shown in FIG. 18, the right protrusion 412 has a right upper surface 4122, a right front surface 4123, a right rear surface 4124, a right inner surface 4125, and a right outer surface 4126.

As shown in FIG. 18, in this embodiment, the right upper surface 4122 faces upward in the vertical direction. The right upper surface 4122 defines the upper end of the right convex portion 412 in the vertical direction. As shown in FIG. 3, when the first case 300 and the second case 400 are combined, the right upper surface 3122 and the right upper surface 4122 face each other in the vertical direction. When the first case 300 and the second case 400 are combined, the right upper surface 4122 does not come into contact with the right upper surface 3122.

As shown in FIG. 18, the right front surface 4123 in this embodiment faces forward in the front-to-rear direction. The right front surface 4123 defines the front end of the right protrusion 412 in the front-to-rear direction. With reference to FIGS. 10, 14, and 18, when the first case 300 and the second case 400 are combined, the right front surface 3123 and the right front surface 4123 face each other in the front-to-rear direction.

As shown in FIG. 18, in this embodiment, the right rear surface 4124 faces rearward in the front-to-rear direction. The right rear surface 4124 defines the rear end of the right protrusion 412 in the front-to-rear direction. With reference to FIGS. 10, 14, and 18, when the first case 300 and the second case 400 are combined, the right rear surface 3124 and the right rear surface 4124 face each other in the front-to-rear direction.

As shown in FIG. 18, the right inner surface 4125 in this embodiment faces left in the left-right direction. The right inner surface 4125 defines the inner end of the right protrusion 412 in the left-right direction. The right inner surface 4125 defines the left end of the right protrusion 412 in the left-right direction. As shown in FIG. 3, when the first case 300 and the second case 400 are combined, the right inner surface 3125 and the right inner surface 4125 face each other in the left-right direction.

As shown in FIG. 18, the right outer surface 4126 in this embodiment faces right in the left-right direction. The right outer surface 4126 defines the outer end of the right protrusion 412 in the left-right direction. The right outer surface 4126 defines the right end of the right protrusion 412 in the left-right direction. As shown in FIG. 3, when the first case 300 and the second case 400 are combined, the right outer surface 3126 and the right outer surface 4126 face each other in the left-right direction.

As shown in Figure 17, the right holes 414 in this embodiment are aligned in the front-to-rear direction. Referring to Figures 17 and 18, the right protrusion 412 is located between the two right holes 414 in the front-to-rear direction. The right protrusion 412 is located inside the right hole 414 in the left-to-right direction. In other words, the right protrusion 412 is located to the left of the right hole 414 in the left-to-right direction.

As shown in FIG. 17, in this embodiment, the left upper end 420 is located to the left of the right upper end 410 in the left-right direction. The left upper end 420 defines the left end of the second case 400 in the left-right direction. As shown in FIG. 8, the left upper end 420 faces the left lower end 320 when the first case 300 and the second case 400 are combined.

As shown in FIG. 17, the left upper end 420 has a left upper surface 421.

As shown in FIG. 17, in this embodiment, the left upper surface 421 faces upward in the vertical direction. The left upper surface 421 is a surface perpendicular to the vertical direction. As shown in FIG. 4, when the first case 300 and the second case 400 are combined, the left upper surface 421 contacts the left lower surface 321.

As shown in Figures 17 and 19, the left upper end 420 has a second left reinforcing portion 422 and two left holes 424.

19, the second left-side reinforcement portion 422 in this embodiment is a left-side protrusion 422. That is, the second left-side reinforcement portion 422 protrudes upward in the vertical direction from the left-side upper surface 421. The left-side protrusion 422 defines the upper end of the left-side upper end portion 420 in the vertical direction. The left-side protrusion 422 is a rectangular parallelepiped protrusion. That is, the size of the left-side protrusion 422 in the front-to-rear direction is larger than the size in the left-to-right direction. As shown in FIG. 17, the left-side protrusion 422 is located near the left end of the second case 400 in the horizontal direction. With reference to FIGS. 17 to 19, the right-side protrusion 412 and the left-side protrusion 422 are aligned in the horizontal direction. With reference to FIG. 4, when the first case 300 and the second case 400 are combined, the left-side protrusion 422 is received in the left-side recess 322. The height LH of the left-side protrusion 422 is smaller than the depth LD of the left-side recess 322. The left convex portion 422 is surrounded by the left recess 322 in the horizontal plane. That is, the left convex portion 422 is surrounded by the peripheral wall 324 in all directions in the horizontal plane. As a result, the left convex portion 422 received in the left recess 322 is restricted from moving in the horizontal plane. More specifically, the left convex portion 422 received in the left recess 322 is restricted from moving in all directions in the horizontal plane. With reference to Figures 4 and 8, when the noise removal device 100 is viewed from the left in the left-right direction, the left convex portion 422 is not visible.

As described above, the left recess 322 is closed in the horizontal plane. However, the present invention is not limited to this. In other words, as long as the movement of the left protrusion 422 received in the left recess 322 in all directions in the horizontal plane is restricted, the left recess 322 may be partially open in the horizontal plane, or the left recess 322 may communicate with the outside of the first case 300 in a direction perpendicular to the up-down direction. In other words, as long as the movement of the left protrusion 422 received in the left recess 322 in all directions in the horizontal plane is restricted, the left recess 322 may have an opening that communicates with the outside of the first case 300. Specifically, the size of this opening must be smaller than the size of the left protrusion 422 in the horizontal plane.

As described above, when the first case 300 and the second case 400 are combined, the left convex portion 422, which is a rectangular parallelepiped convex portion, is received in the left concave portion 322. This ensures a large total surface area for the opposing faces of the left concave portion 322 and the left convex portion 422 in a limited space.

As shown in FIG. 19, the left protrusion 422 has a left upper surface 4222, a left front surface 4223, a left rear surface 4224, a left inner surface 4225, and a left outer surface 4226.

As shown in FIG. 19, in this embodiment, the left upper surface 4222 faces upward in the vertical direction. The left upper surface 4222 defines the upper end of the left convex portion 422 in the vertical direction. As shown in FIG. 4, when the first case 300 and the second case 400 are combined, the left upper surface 3222 and the left upper surface 4222 face each other in the vertical direction. When the first case 300 and the second case 400 are combined, the left upper surface 4222 does not contact the left upper surface 3222.

As shown in FIG. 19, the left front surface 4223 in this embodiment faces forward in the front-to-rear direction. The left front surface 4223 defines the front end of the left protrusion 422 in the front-to-rear direction. With reference to FIGS. 10, 16, and 19, when the first case 300 and the second case 400 are combined, the left front surface 3223 and the left front surface 4223 face each other in the front-to-rear direction.

As shown in FIG. 19, in this embodiment, the left rear surface 4224 faces rearward in the front-to-rear direction. The left rear surface 4224 defines the rear end of the left protrusion 422 in the front-to-rear direction. With reference to FIGS. 10, 16, and 19, when the first case 300 and the second case 400 are combined, the left rear surface 3224 and the left rear surface 4224 face each other in the front-to-rear direction.

As shown in FIG. 19, in this embodiment, the left inner surface 4225 faces right in the left-right direction. The left inner surface 4225 defines the inner end of the left convex portion 422 in the left-right direction. The left inner surface 4225 defines the right end of the left convex portion 422 in the left-right direction. As shown in FIG. 4, when the first case 300 and the second case 400 are combined, the left inner surface 3225 and the left inner surface 4225 face each other in the left-right direction.

As shown in FIG. 19, in this embodiment, the left outer surface 4226 faces left in the left-right direction. The left outer surface 4226 defines the outer end of the left convex portion 422 in the left-right direction. The left inner surface 4225 defines the left end of the left convex portion 422 in the left-right direction. As shown in FIG. 4, when the first case 300 and the second case 400 are combined, the left outer surface 3226 and the left outer surface 4225 face each other in the left-right direction.

As shown in Figure 17, the left holes 424 in this embodiment are aligned in the front-to-rear direction. Referring to Figures 17 and 19, the left protrusion 422 is located between the two left holes 424 in the front-to-rear direction. The left protrusion 422 is located inside the left hole 424 in the left-to-right direction. In other words, the left protrusion 422 is located to the right of the left hole 424 in the left-to-right direction.

As shown in FIG. 7, the second right engagement portion 430 in this embodiment is located at the right end of the right upper end portion 410. As shown in FIG. 6, the second right engagement portion 430 and the second left engagement portion 440 are aligned in the left-right direction. The second right engagement portion 430 is located at the same position as the first right engagement portion 330 in the left-right direction. Referring to FIG. 7, the first right engagement portion 330 and the second right engagement portion 430 form the right cantilever snap fit 510. As described above, the right protrusion 412 is received in the right recess 312, thereby reinforcing the right cantilever snap fit 510.

As described above, the right-side protrusion 412 received in the right-side recess 312 is restricted from moving in the horizontal plane. This reduces the stress applied to the right-side cantilever snap fit 510 even when vibrations are applied to the noise elimination device 100 in the horizontal plane, preventing damage to the right-side cantilever snap fit 510.

As shown in FIG. 7, the right cantilever snap fit 510 has two engagement structures 520 positioned apart from each other in the front-to-rear direction. The right protrusion 412 is positioned between the two engagement structures 520 in the front-to-rear direction. Referring to FIGS. 7 and 17, the engagement structures 520 each correspond to the right hole 414.

As shown in FIG. 7, each engagement structure 520 has a hook portion 530 and a hooked portion 540.

As shown in Figure 13, the hook portion 530 of this embodiment is provided on the first case 300. The hook portion 530 has a plate portion 532 and a claw portion 534.

Referring to Figures 11 and 12, the plate portion 532 of this embodiment is elastically deformable. The plate portion 532 has a first size SR1 in the vertical direction and a second size SR2 in the direction perpendicular to the vertical direction. More specifically, the plate portion 532 has a first size SR1 in the vertical direction and a second size SR2 in the front-to-rear direction. Furthermore, the first size SR1 is larger than the second size SR2. This allows the plate portion 532 to easily elastically deform. Referring to Figures 7, 13, and 17, each plate portion 532 of the engagement structure 520 is received in the corresponding right hole 414.

As shown in FIG. 11 , the claw portion 534 in this embodiment defines the lower end of the hook portion 530 in the up-down direction. The claw portion 534 defines the lower end of the first case 300 in the up-down direction. The claw portion 534 protrudes outward in the left-right direction. In other words, the claw portion 534 protrudes to the right in the left-right direction. The claw portion 534 is supported by the plate portion 532.

As shown in Figure 7, the hooked portion 540 in this embodiment is provided on the second case 400. The hooked portion 540 is the portion on which the claw portion 534 hooks.

As shown in FIG. 6, the second left-side engagement portion 440 in this embodiment is located at the left end of the left-side upper end portion 420. As shown in FIG. 8, the second left-side engagement portion 440 is located at the same position in the left-right direction as the first left-side engagement portion 340. The first left-side engagement portion 340 and the second left-side engagement portion 440 form the left-side cantilever snap fit 550. As described above, the left-side protrusion 422 is received in the left-side recess 322, thereby reinforcing the left-side cantilever snap fit 550.

As described above, the left convex portion 422 received in the left concave portion 322 is restricted from moving in the horizontal plane. This reduces the stress applied to the left cantilever snap fit 550 even when vibrations are applied to the noise elimination device 100 in the horizontal plane, preventing damage to the left cantilever snap fit 550.

In particular, in this embodiment, the right-side convex portion 412 located near the right end of the second case 400 is restricted from moving in the horizontal plane, and the left-side convex portion 422 located near the left end of the second case 400 is also restricted from moving in the horizontal plane. As a result, even if vibrations are applied to the noise removal device 100 in the horizontal plane, the stress applied to the cantilever snap fits 510, 550 is further alleviated, thereby further preventing damage to the cantilever snap fits 510, 550.

As shown in FIG. 8, the left cantilever snap fit 550 has two engagement structures 560 positioned apart from each other in the front-to-rear direction. As described above, the right cantilever snap fit 510 has two engagement structures 520, so the noise elimination device 100 has four engagement structures 520, 560. Referring to FIGS. 8, 17, and 19, the left protrusion 422 is positioned between the two engagement structures 560 in the front-to-rear direction. The engagement structures 560 each correspond to a left hole 424.

As shown in FIG. 8, each engagement structure 560 has a hook portion 570 and a hooked portion 580.

As shown in FIG. 12, the hook portion 570 of this embodiment is provided on the first case 300. The hook portion 570 has a plate portion 572 and a claw portion 574.

Referring to Figures 11 and 12, the plate portion 572 of this embodiment is elastically deformable. The plate portion 572 has a first size SL1 in the vertical direction and a second size SL2 in the direction perpendicular to the vertical direction. More specifically, the plate portion 572 has a first size SL1 in the vertical direction and a second size SL2 in the front-to-rear direction. The first size SL1 is larger than the second size SL2. This allows the plate portion 572 to easily elastically deform. Referring to Figures 8, 15, and 17, each plate portion 572 of the engagement structure 560 is housed in a corresponding left hole 424.

As described above, the noise elimination device 100 has four engagement structures 520, 560. This prevents the concentration of load on each of the easily elastically deformable plate portions 532, 572.

As shown in FIG. 11, the claw portion 574 in this embodiment defines the lower end of the hook portion 570 in the up-down direction. The claw portion 574 protrudes outward in the left-right direction. In other words, the claw portion 574 protrudes to the left in the left-right direction. The claw portion 574 is supported by the plate portion 572.

As shown in Figure 8, the hooked portion 580 in this embodiment is provided on the second case 400. The hooked portion 580 is the portion on which the claw portion 574 hooks.

As shown in Figure 1, the case member 200 is provided with a fixing portion 600.

Referring to FIG. 5, the fixing portion 600 of this embodiment has through-holes 610 that penetrate in the vertical direction. The through-holes 610 are formed to insert fixing devices (not shown) when fixing the noise reduction device 100 to an object (not shown). Examples of fixing devices include bolts. Specifically, the noise reduction device 100 is fixed to an object such as a housing by fastening a bolt inserted through the through-hole 610 to a screw hole provided in the object. As shown in FIG. 10, the fixing portions 600 are provided on the first case 300. That is, each fixing portion 600 fixes only the first case 300 to the object. The second case 400 does not have fixing portions 600. As shown in FIG. 5, the fixing portions 600 are provided to extend in a horizontal plane from the peripheral surface 210. The front fixing portion 600 extends forward from the front surface 212. The front fixing portion 600 extends leftward from the left side surface 218. The rear fixing portion 600 extends rearward from the rear surface 214. The rear fixing portion 600 extends rightward from the right side surface 216.

The noise removal device 100 of this embodiment is fixed to the object in the vertical direction by the fixing part 600 described above. As a result, when vertical vibrations are applied to the noise removal device 100, the stress applied to the cantilever snap fits 510, 550 is alleviated by the fixing part 600. With regard to vibrations in the horizontal plane applied to the noise removal device 100, as described above, the combination of the right recess 312 and the right protrusion 412 and the combination of the left recess 322 and the left protrusion 422 alleviates the stress applied to the cantilever snap fits 510, 550. That is, in the noise removal device 100 of this embodiment, the direction of vibration corresponding to the stress alleviated by the combination of the right recess 312 and the right protrusion 412 and the direction of vibration corresponding to the stress alleviated by the fixing part 600 are mutually perpendicular. In other words, the combination of the right recess 312 and the right protrusion 412 and the fixed part 600 have a complementary relationship in terms of the vibration directions corresponding to the stress they relieve. Similarly, in the noise removal device 100 of this embodiment, the vibration directions corresponding to the stress relieved by the combination of the left recess 322 and the left protrusion 422 and the vibration directions corresponding to the stress relieved by the fixed part 600 are perpendicular to each other. In other words, the vibration directions corresponding to the stress they relieve by the combination of the left recess 322 and the left protrusion 422 and the fixed part 600 have a complementary relationship.

As shown in Figure 7, the case member 200 is formed with ribs 250.

As shown in FIG. 7 , the ribs 250 in this embodiment extend from the peripheral surface 210 to the fixing portion 600. The front rib 250 extends from the front surface 212 to the front fixing portion 600. The rear rib 250 extends from the rear surface 214 to the rear fixing portion 600.

In the noise elimination device 100 of this embodiment, the connecting portion between the peripheral surface 210 of the case member 200 and the fixed portion 600 is reinforced by the above-mentioned rib 250. This prevents damage to the connecting portion even if the noise elimination device 100 is subjected to vertical vibrations.

The present invention has been specifically described above using embodiments thereof, but the present invention is not limited to these and various modifications and variations are possible.

In the above-described embodiment, the first right-side reinforcement portion 312 is a right-side recess 312 and the second right-side reinforcement portion 412 is a right-side protrusion 412. However, the present invention is not limited to this. The first right-side reinforcement portion 312 may be a right-side protrusion and the second right-side reinforcement portion 412 may be a right-side recess. In other words, it is sufficient that one of the first right-side reinforcement portion 312 and the second right-side reinforcement portion 412 is a right-side recess and the other is a right-side protrusion. This allows the same effects as those of the above-described embodiment to be achieved.

In the above-described embodiment, the first left-side reinforcement portion 322 is a left-side recess 322, and the second left-side reinforcement portion 422 is a left-side protrusion 422. However, the present invention is not limited to this. The first left-side reinforcement portion 322 may be a left-side protrusion, and the second left-side reinforcement portion 422 may be a left-side recess. In other words, it is sufficient that one of the first left-side reinforcement portion 322 and the second left-side reinforcement portion 422 is a left-side recess, and the other is a left-side protrusion. This allows the same effects as the above-described embodiment to be achieved.

In the above-described embodiment, the hook portions 530, 570 are provided on the first case 300, and the hooked portions 540, 580 are provided on the second case 400, but the present invention is not limited to this. That is, the hooked portion 540 may be provided on the first case 300, and the hook portion 530 may be provided on the second case 400. Similarly, the hooked portion 580 may be provided on the first case 300, and the hook portion 570 may be provided on the second case 400.

While the fixing portion 600 in the above-described embodiment fixes only the first case 300 to the object, the present invention is not limited to this. The fixing portion 600 may fix only the second case 400 to the object. That is, the fixing portion 600 may fix only one of the first case 300 and the second case 400 to the object. In this case, if vibrations are applied in a horizontal plane to a noise removal device 100 that does not have the first right-side reinforcement portion 312, the first left-side reinforcement portion 322, the second right-side reinforcement portion 412, and the second left-side reinforcement portion 422, the stress in the other of the first case 300 and the second case 400 that is not fixed to the object by the fixing portion 600 is not alleviated, and the cantilever snap fits 510, 550 may be subjected to the stress and break. However, since the noise removal device 100 of this embodiment has the first right-side reinforcement portion 312, the first left-side reinforcement portion 322, the second right-side reinforcement portion 412, and the second left-side reinforcement portion 422, even if the fixing portion 600 fixes only one of the first case 300 and the second case 400 to an object, stress on the other of the first case 300 and the second case 400 due to vibrations in the horizontal plane applied to the noise removal device 100 is alleviated, preventing damage to the cantilever snap fits 510, 550 and achieving the same effects as the above-described embodiment. It is also possible to provide the fixing portion 600 on the case member 200 that fixes only one of the first case 300 and the second case 400 to an object, and another fixing portion that fixes only the other of the first case 300 and the second case 400 to an object. In this case, the same effects as the above-described embodiment can be achieved.

100 Noise removal device 200 Case member 210 Circumferential surface 212 Front surface 214 Rear surface 216 Right side surface 218 Left side surface 250 Rib 300 First case 310 Right lower end 311 Right lower surface 312 First right side reinforcement part (right side recess)
3122 Right upper surface 3123 Right front surface 3124 Right rear surface 3125 Right inner surface 3126 Right outer surface 314 Peripheral wall 320 Left lower end 321 Left lower surface 322 First left side reinforcement part (left side recess)
3222 Upper left surface 3223 Front left side 3224 Rear left surface 3225 Inner left surface 3226 External left surface 324 Peripheral wall 330 First right engaging section 340 First left engaging section 400 Second case 411 Upper right surface 410 Upper right end 412 Second right reinforcing section (right side protrusion)
4122 Right upper surface 4123 Right front surface 4124 Right rear surface 4125 Right inner surface 4126 Right outer surface 414 Right hole 420 Left upper end 421 Left upper surface 422 2nd left side reinforcement part (left side convex part)
4222 Left upper surface 4223 Left front surface 4224 Left rear surface 4225 Left inner surface 4226 Left outer surface 424 Left hole 430 Second right engaging portion 440 Second left engaging portion 510 Right cantilever snap fit 520 Engagement structure 530 Hook portion 532 Plate portion 534 Claw portion 540 Hooked portion 550 Left cantilever snap fit 560 Engagement structure 570 Hook portion 572 Plate portion 574 Claw portion 580 Hooked portion 600 Fixing portion 610 Through hole 700 Magnetic core 705 Through hole 710 First core 720 Second core LD Depth LH Height RD Depth RH Height SL1 First size SL2 Second size SR1 1st size SR2 2nd size

Claims (7)

A noise elimination device comprising: a magnetic core having a through hole extending in a front-rear direction; and a case member accommodating the magnetic core; and the noise elimination device is used by inserting a conductor into the through hole,
The magnetic core includes a first core and a second core,
each of the first core and the second core has a U-shaped cross section in a vertical plane perpendicular to the front-rear direction,
the case member includes a first case that houses the first core, and a second case that houses the second core and is combined with the first case in a vertical direction perpendicular to the front-rear direction,
the first case has a right lower end portion, a left lower end portion, a first right engaging portion, and a first left engaging portion;
a first right reinforcing portion and a first left reinforcing portion are provided at the right lower end portion and the left lower end portion, respectively;
the second case has a right upper end, a left upper end, a second right engaging portion, and a second left engaging portion;
the right upper end portion and the left upper end portion face the right lower end portion and the left lower end portion, respectively, when the first case and the second case are combined;
a second right reinforcing portion and a second left reinforcing portion are provided at the right upper end portion and the left upper end portion, respectively;
the first right engagement portion and the second right engagement portion constitute a right cantilever snap fit,
the first left engagement portion and the second left engagement portion form a left cantilever snap fit,
one of the first right-side reinforcing portion and the second right-side reinforcing portion is a right-side recess and the other is a right-side protrusion,
one of the first left reinforcing portion and the second left reinforcing portion is a left concave portion and the other is a left convex portion,
the right convex portion is surrounded by the right concave portion in a horizontal plane perpendicular to the up-down direction,
the right protrusion is received in the right recess and reinforces the right cantilever snap fit;
the left convex portion is surrounded by the left concave portion in the horizontal plane,
the left protrusion is received in the left recess to reinforce the left cantilever snap fit;
The case member is provided with a fixing portion,
a through-hole penetrating the fixing portion in the up-down direction is formed in the fixing portion, and a fixing tool is inserted through the through-hole when fixing the noise removal device to an object;
the fixing portion is provided on the first case,
The second case does not have the fixing portion.
Noise removal device. 2. The noise removal device according to claim 1,
The left recess is closed in the horizontal plane. 3. The noise removal device according to claim 1,
The noise removal device, wherein the right convex portion and the left convex portion are rectangular parallelepiped convex portions. The noise removal device according to any one of claims 1 to 3 ,
The fixing unit fixes only the first case to the object. The noise removal device according to any one of claims 1 to 4 ,
the case member has a peripheral surface,
the fixing portion is provided so as to extend from the peripheral surface into the horizontal plane,
The noise removal device includes a rib formed on the case member, the rib extending from the peripheral surface to the fixed portion. The noise removal device according to any one of claims 1 to 5 ,
each of the right cantilever snap fit and the left cantilever snap fit has two engagement structures positioned apart from each other in the front-to-rear direction;
Each of the engagement structures has a hook portion having an elastically deformable plate portion and a claw portion supported by the plate portion, and a hooked portion on which the claw portion is hooked,
the plate portion has a first size in the up-down direction and a second size in a direction perpendicular to the up-down direction,
The noise reduction device, wherein the first size is larger than the second size. The noise removal device according to any one of claims 1 to 6 ,
The height of the right convex portion is smaller than the depth of the right concave portion,
A noise removal device in which the height of the left convex portion is smaller than the depth of the left concave portion.