JP6616875B1 - Cable gland - Google Patents

Abstract

Provided is a cable gland capable of reducing noise of a cable while suppressing entry of foreign matter into a case. A cable gland 100 is for attaching a cable 150 to a case 160. A gland main body 1 that can be attached to the case 160, a cap 2 that is tightened to the gland main body 1, a gland main body 1, and a cable 150. And a ferrite core 4 for noise reduction of the cable 150. The ferrite core 4 is attached to the cap 2. [Selection] Figure 3

Description

  The present invention relates to a cable gland.

  Conventionally, a cable gland for attaching a cable to a case is known (see, for example, Patent Documents 1 and 2).

  The cable gland of Patent Document 1 includes a gland body that can be attached to a case, a cap that is tightened to the gland body, and a sleeve that is press-fitted between the gland body and the cable by tightening the cap. In this cable gland, since the gap between the gland body and the cable is filled by the sleeve, it is possible to suppress entry of foreign matter (for example, water, oil, and dust) into the case.

  The cable gland of Patent Document 2 is formed in a cylindrical shape, a fixing screw portion is formed on the outer peripheral surface, and a ferrite core is attached to the inner peripheral surface. A hole through which the cable is inserted is formed in the ferrite core. In this cable gland, the noise of the cable can be reduced by the ferrite core.

JP-A-2018-98828 JP 2002-171612 A

  However, although the above-described cable gland in Patent Document 1 can suppress the entry of foreign matter into the case, there is a problem that the noise of the cable cannot be reduced. Moreover, in the cable gland of Patent Document 2 described above, it is possible to reduce cable noise, but there is a possibility that foreign matter may enter from a gap between the ferrite core and the cable.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a cable gland capable of reducing cable noise while suppressing entry of foreign matter into the case. It is to be.

A cable gland according to the present invention is for attaching a cable to a case, a gland main body that can be attached to the case, a cap that is tightened to the gland main body, a sleeve that is press-fitted between the gland main body and the cable, and a cable. The ferrite core for noise reduction of this, and the attachment member for attaching a ferrite core to a cap . The ferrite core is attached to the cap by an attachment member . The cap includes a cylindrical side peripheral wall portion and a top wall portion formed at one end of the side peripheral wall portion. A first insertion hole through which the cable is inserted is formed in the top wall portion, and a female screw portion is formed on the other end side on the inner peripheral surface of the side peripheral wall portion. The ferrite core is formed in an annular shape so that the cable can be inserted, and is disposed between the top wall portion and the female screw portion in the side peripheral wall portion of the cap.

  By comprising in this way, since the clearance gap between a ground main body and a cable can be filled with a sleeve, the penetration | invasion of the foreign material in a case can be suppressed. Moreover, the noise of the cable can be reduced by the ferrite core.

  In the cable gland including the mounting member, the mounting member includes a circular plate portion having a second insertion hole through which the cable is inserted, a mounting portion disposed on one surface side of the plate portion, and the other surface side of the plate portion. The mounting portion is formed on the inner edge portion of the plate portion and is configured to be attached to the cap. The holding portion is formed on the outer edge portion of the plate portion and holds the ferrite core. It may be configured as follows.

  In the cable gland in which the attachment member includes the attachment portion and the holding portion, the attachment portion has a snap-fit structure, and may be configured to be fitted into the first insertion hole of the top wall portion of the cap.

  In the cable gland in which the attachment member includes the attachment portion and the holding portion, the holding portion may have a snap-fit structure, and may be configured to hold the ferrite core from the outer peripheral surface side.

  In the cable gland in which the ferrite core is disposed between the top wall portion and the female screw portion, the ground main body includes a cylindrical main body portion through which the cable is inserted and a flange portion that projects outward from the other end portion of the main body portion. The flange portion is configured to be attachable to the case, and the outer peripheral surface of the main body portion is formed with a male screw portion that is screwed with the female screw portion, and the sleeve is cylindrical so that the cable can be inserted therethrough. The sleeve may be pressed by the ferrite core and the sleeve may be press-fitted between the main body portion and the cable by being formed and the cap being tightened to the ground main body.

  According to the cable gland of the present invention, the noise of the cable can be reduced while suppressing the entry of foreign matter into the case.

It is the perspective view which showed the cable gland by this embodiment. FIG. 2 is an exploded perspective view showing the cable gland of FIG. 1. FIG. 2 is a cross-sectional view illustrating a state in which the cable gland in FIG. 1 fixes the cable to the case. It is the perspective view which showed the cap of the cable gland of FIG. It is the perspective view which showed the holder of the cable gland of FIG. FIG. 6 is a perspective view showing a state in which the ferrite core is held by the holder of FIG. 5. It is the perspective view which showed the state in which the holder of FIG. 6 was attached to the cap.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  First, the structure of a cable gland 100 according to an embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 3, the cable gland 100 is provided to attach the cable 150 to the case 160. The cable gland 100 is configured to fix the cable 150 inserted into the insertion hole 161 of the case 160 to the case 160. For example, the cable 150 is a power cable that connects an unillustrated motor and an inverter, and the case 160 is an inverter case that houses the inverter. The side (X1 direction side) where the cable gland 100 is attached to the case 160 is the outer side of the case 160, and the opposite side (X2 direction side) is the inner side of the case 160.

  As shown in FIG. 2, the cable gland 100 includes a gland body 1, a cap 2, a sleeve 3, a ferrite core 4, and a holder 5. The holder 5 is an example of the “mounting member” in the present invention.

[Grand body]
The ground body 1 is configured to be attachable to the case 160. The ground main body 1 is made of, for example, resin, and has a cylindrical main body portion 11 through which the cable 150 is inserted, and a flange portion 12 that projects outward from the other end portion (end portion on the X2 direction side) of the main body portion 11. Is included. A male screw portion 13 to which the cap 2 is screwed is formed on the outer peripheral surface of the main body portion 11. As shown in FIG. 3, a large diameter portion 14a, a reduced diameter portion (tapered portion) 14b, and a small diameter portion 14c are formed on the inner peripheral surface of the main body 11 so as to be continuous. The large diameter portion 14a is disposed on one side (X1 direction side), the small diameter portion 14c is disposed on the other side (X2 direction side), and the reduced diameter portion 14b is disposed between the large diameter portion 14a and the small diameter portion 14c. Yes. The reduced diameter portion 14b is formed so that the opening diameter gradually decreases toward the flange portion 12 side (X2 direction side).

  The flange portion 12 is configured to be attachable to the case 160, and when the flange portion 12 is attached to the case 160, the small diameter portion 14 c is fitted into the insertion hole 161 of the case 160. Bolt insertion holes 15 are formed in the flange portion 12, and bolt insertion holes 162 are formed in the case 160, and bolts (not shown) inserted through the bolt insertion holes 15 and 162 are fastened. Thus, the flange portion 12 is attached to the case 160.

[cap]
The cap 2 is configured to be fastened to the ground body 1. The cap 2 is made of, for example, resin, and as shown in FIG. 4, a cylindrical side peripheral wall portion 21 and a top wall portion formed at one end portion (end portion on the X1 direction side) of the side peripheral wall portion 21. 22 is included. An insertion hole 23 through which the cable 150 is inserted is formed in the top wall portion 22. On the other end side (X2 direction side) of the inner peripheral surface of the side peripheral wall portion 21, a female screw portion 24 that is screwed with the male screw portion 13 is formed. Further, the cap 2 is provided with a housing portion 25 in which the ferrite core 4 is housed between the top wall portion 22 and the female screw portion 24 in the side peripheral wall portion 21. The insertion hole 23 is an example of the “first insertion hole” in the present invention.

[sleeve]
As shown in FIG. 2, the sleeve 3 is made of rubber, for example, and is configured to be elastically deformable. The sleeve 3 is formed in a cylindrical shape so that the cable 150 can be inserted. The sleeve 3 is configured to be press-fitted between the main body portion 11 of the ground main body 1 and the cable 150.

[Ferrite core]
The ferrite core 4 is made of a magnetic material and is provided to reduce noise of the cable 150. The ferrite core 4 is vulnerable to impact and is formed in an annular shape so that the cable 150 can be inserted. The ferrite core 4 is attached to the cap 2 by the holder 5 and is accommodated in the accommodating portion 25 of the cap 2.

[holder]
As shown in FIG. 7, the holder 5 is provided to attach the ferrite core 4 to the cap 2. That is, the holder 5 is interposed between the cap 2 and the ferrite core 4 and is made of, for example, a thin plate material. The holder 5 is made of, for example, resin, and includes a plate portion 51, an attachment portion 52, and a holding portion 53 as shown in FIG.

  The plate part 51 is formed in a substantially circular shape and has an insertion hole 51a through which the cable 150 is inserted. A mounting portion 52 is disposed on one surface side (X1 direction side) of the plate portion 51, and a holding portion 53 is disposed on the other surface side (X2 direction side) of the plate portion 51. The insertion hole 51a is an example of the “second insertion hole” in the present invention.

  The attachment portion 52 is configured to be attached to the cap 2. The mounting portion 52 is formed at the inner edge portion of the plate portion 51, and a plurality of the mounting portions 52 are provided at predetermined intervals in the circumferential direction. That is, the plurality of attachment portions 52 are arranged in a circular shape so as to surround the insertion hole 51a. For example, six attachment portions 52 are arranged at intervals of 60 degrees. Each attachment portion 52 protrudes radially outward from the pair of arm portions 521 extending from the plate portion 51 to one side (X1 direction side), the connecting portion 522 connecting the distal ends of the pair of arm portions 521, and the connecting portion 522. And a claw portion 523 to be used. The arm portion 521 is configured to be elastically deformable in the radial direction. As shown in FIG. 1, the claw portion 523 is adapted to be engaged with the outer surface (surface on the X1 direction side) of the top wall portion 22 of the cap 2. That is, each attachment portion 52 has a snap-fit structure and is configured to be fitted into the insertion hole 23 of the top wall portion 22 of the cap 2.

  As shown in FIG. 6, the holding unit 53 is configured to hold the ferrite core 4. The holding portion 53 is formed on the outer edge portion of the plate portion 51, and a plurality of holding portions 53 are provided at predetermined intervals in the circumferential direction. That is, the plurality of holding portions 53 are arranged in a circular shape so as to surround the plate portion 51. The holding portions 53 are arranged so as to be shifted in the circumferential direction with respect to the mounting portions 52, and the mounting portions 52 and the holding portions 53 are alternately arranged in the circumferential direction. For example, the six holding portions 53 are arranged at intervals of 60 degrees, and the holding portions 53 are shifted from the attachment portion 52 by 30 degrees. Each holding portion 53 protrudes inward in the radial direction from the pair of arm portions 531 extending from the plate portion 51 to the other side (X2 direction side), the connecting portion 532 connecting the distal ends of the pair of arm portions 531, and the connecting portion 532. And a claw portion 533 to be used. The arm portion 531 is configured to be elastically deformable in the radial direction. The claw portion 533 is engaged with the other surface (surface on the X2 direction side) of the ferrite core 4. That is, each holding portion 53 has a snap-fit structure and is configured to hold the ferrite core 4 from the outer peripheral surface side.

-Cable gland assembly method-
Next, a method for assembling the cable gland 100 according to the present embodiment will be described with reference to FIGS.

  First, the ground body 1 (see FIG. 3) is attached to the case 160 (see FIG. 3). Specifically, a bolt (not shown) inserted through the bolt insertion hole 15 of the ground body 1 and the bolt insertion hole 162 of the case 160 is fastened, whereby the flange portion 12 of the ground body 1 is attached to the case 160. . At this time, the small diameter portion 14 c of the ground main body 1 is fitted into the insertion hole 161 of the case 160, and the internal space of the ground main body 1 is communicated with the inside of the case 160 through the insertion hole 161.

  Further, as shown in FIG. 6, the ferrite core 4 is held by the holding portion 53 of the holder 5. Specifically, the ferrite core 4 is moved to the plate portion 51 side in a state where the claw portion 533 of the holding portion 53 is released by elastically deforming the arm portion 531 (see FIG. 5) of the holding portion 53 radially outward. Pushed in. When the ferrite core 4 is pushed in until it comes into contact with the plate portion 51, the arm portion 531 returns to its original position, and the claw portion 533 is engaged with the other surface (surface on the X2 direction side) of the ferrite core 4. . For this reason, the ferrite core 4 is held by the holding portion 53. In a state where the ferrite core 4 is held by the holding portion 53, the ferrite core 4 is sandwiched between the plate portion 51 and the claw portion 533 in the thickness direction, and the outer peripheral surface of the ferrite core 4 is surrounded by the arm portion 531.

  Next, as shown in FIG. 7, a holder 5 that holds the ferrite core 4 is attached to the cap 2. Specifically, when the attachment portion 52 (see FIG. 2) of the holder 5 is inserted into the insertion hole 23 (see FIG. 2) of the cap 2, the claw portion 523 is radially inward by the inner peripheral surface of the insertion hole 23. And the arm portion 521 is elastically deformed. When the claw portion 523 passes through the insertion hole 23, the arm portion 521 returns to the original position, and the claw portion 523 is engaged with the outer surface (surface on the X1 direction side) of the top wall portion 22 of the cap 2. For this reason, the attaching part 52 (refer FIG. 1) is attached to the cap 2 (refer FIG. 1). In a state where the attachment portion 52 is attached to the cap 2, the arm portion 521 is inserted through the insertion hole 23, and the top wall portion 22 is sandwiched between the plate portion 51 and the claw portion 523. That is, the arm portion 521 is disposed along the inner peripheral surface of the insertion hole 23, and the plate portion 51 is disposed along the inner surface (surface on the X2 direction side) of the top wall portion 22. Further, the arm portion 531 of the holder 5 is disposed along the inner surface of the side peripheral wall portion 21 of the cap 2.

  In this way, the ferrite core 4 is attached to the cap 2 by the holder 5. The ferrite core 4 attached to the cap 2 is accommodated in the accommodating portion 25 (see FIG. 4) of the cap 2.

  The cable 150 (see FIG. 3) is inserted into the insertion hole 161 of the case 160 and the main body portion 11 of the ground body 1, and the sleeve 3 and the cap 2 are inserted into the cable 150. Since the ferrite core 4 is attached to the cap 2 via the holder 5, the cable 150 is inserted into the insertion hole 23 of the cap 2, the insertion hole 51 a of the holder 5, and the ferrite core 4.

  Next, as shown in FIG. 3, the female screw portion 24 of the cap 2 is fastened to the male screw portion 13 of the ground body 1 with the sleeve 3 fitted to the main body portion 11 of the ground body 1. At this time, the sleeve 3 is pressed to the flange portion 12 side (X2 direction side) by the ferrite core 4 in the cap 2. For this reason, the sleeve 3 is pushed between the reduced diameter portion 14b of the ground body 1 and the cable 150, and the sleeve 3 is elastically deformed and press-fitted. Therefore, since the gap between the ground body 1 and the cable 150 is filled by the sleeve 3, entry of foreign matters (for example, water, oil, and dust) into the case 160 is suppressed. Further, since the ferrite core 4 is pressed against the top wall portion 22 side of the cap 2 by the repulsive force of the sleeve 3, the position of the ferrite core 4 in the cap 2 is stabilized. The tightening amount of the cap 2 is adjusted according to the diameter of the cable 150, for example. When the cap 2 is fastened to the ground body 1, the top wall portion 22 of the cap 2 is slid with respect to the plate portion 51 of the holder 5.

-Effect-
In the present embodiment, as described above, since the sleeve 3 is press-fitted between the ground body 1 and the cable 150, the gap between the ground body 1 and the cable 150 can be filled. Invasion of foreign matter into the body can be suppressed. Moreover, the noise of the cable 150 can be reduced by attaching the ferrite core 4 to the cap 2. Therefore, the noise of the cable 150 can be reduced while suppressing the entry of foreign matter into the case 160.

  Moreover, in this embodiment, since the ferrite core 4 can be protected by the cap 2 by accommodating the ferrite core 4 in the accommodating part 25 of the cap 2, it can suppress that the ferrite core 4 is damaged. it can.

  In the present embodiment, the ferrite core 4 can be easily attached to the cap 2 by providing the holder 5.

  In the present embodiment, the mounting portion 52 is formed on the inner edge portion on the one surface side of the plate portion 51, and the holding portion 53 is formed on the outer edge portion on the other surface side of the plate portion 51. The ferrite core 4 can be appropriately attached to the cap 2 because it is attached to the cap 2 by the attachment portion 52 while holding the ferrite core 4. Thereby, irrespective of the attitude | position of an assembly operation | work, the damage of the ferrite core 4 by the drop-off | omission from the cap 2 of the ferrite core 4 and a fall can be suppressed. Further, the uneven load between the cap 2 and the ferrite core 4 can be reduced, and the sliding friction during the rotation of the cap 2 can be reduced. Furthermore, since the holder 5 is comprised with the thin plate-shaped material, it can suppress that the cable gland | grand | ground 100 enlarges.

  Moreover, in this embodiment, the holder 5 can be easily attached to and detached from the cap 2 because the attachment portion 52 has a snap-fit structure. Further, since the holding portion 53 has a snap-fit structure, the ferrite core 4 can be easily attached to and detached from the holder 5. The impedance characteristics can be changed by changing the material and shape of the ferrite core 4 (for example, the opening area of the hollow portion).

-Other embodiments-
In addition, embodiment disclosed this time is an illustration in all the points, Comprising: It does not become a basis of limited interpretation. Therefore, the technical scope of the present invention is not interpreted only by the above-described embodiments, but is defined based on the description of the scope of claims. Further, the technical scope of the present invention includes all modifications within the meaning and scope equivalent to the scope of the claims.

  For example, in the above-described embodiment, the example in which the present invention is applied to the cable gland 100 that fixes the cable 150 that is a power cable that connects the motor and the inverter is shown. However, the present invention is not limited thereto, and the motor and the inverter are connected. The present invention may be applied to a cable gland for fixing a cable other than the power cable.

  Moreover, although the example which applies this invention to the cable gland | gland 100 which fixes the cable 150 to the case 160 which is an inverter case was shown in the said embodiment, it is not restricted to this, The cable which fixes a cable to cases other than an inverter case The present invention may be applied to the ground.

  In the above embodiment, an example in which the six attachment portions 52 are provided has been described. However, the present invention is not limited to this, and the number of attachment portions may be any number. Similarly, an example in which six holding units 53 are provided has been described, but the number is not limited to this, and any number of holding units may be provided.

  The present invention can be used for a cable gland for attaching a cable to a case.

1 Ground body 2 Cap 3 Sleeve 4 Ferrite core 5 Holder (mounting member)
DESCRIPTION OF SYMBOLS 11 Main-body part 12 Flange part 13 Male thread part 21 Side peripheral wall part 22 Top wall part 23 Insertion hole (1st insertion hole)
24 female thread part 51 plate part 51a insertion hole (second insertion hole)
52 Mounting portion 53 Holding portion 100 Cable gland 150 Cable 160 Case

Claims (5)

A cable gland for attaching the cable to the case,
A gland body attachable to the case;
A cap fastened to the ground body;
A sleeve press-fitted between the ground body and the cable;
A ferrite core for noise reduction of the cable ;
An attachment member for attaching the ferrite core to the cap ;
The ferrite core is attached to the cap by the attachment member ,
The cap includes a cylindrical side peripheral wall portion and a top wall portion formed at one end of the side peripheral wall portion,
The top wall is formed with a first insertion hole through which the cable is inserted,
On the inner peripheral surface of the side peripheral wall portion, a female thread portion is formed on the other end side,
The ferrite core is formed in an annular shape so that the cable can be inserted, and is disposed between the top wall portion and the female screw portion in a side peripheral wall portion of the cap. ground. The cable gland according to claim 1 ,
The mounting member includes a circular plate portion having a second insertion hole through which the cable is inserted, a mounting portion disposed on one surface side of the plate portion, and a holding member disposed on the other surface side of the plate portion. Including
The attachment portion is formed on an inner edge portion of the plate portion, and is configured to be attached to the cap.
The cable gland characterized in that the holding portion is formed on an outer edge portion of the plate portion and configured to hold the ferrite core. The cable gland according to claim 2 ,
The cable gland characterized in that the attachment portion has a snap-fit structure and is configured to be fitted into a first insertion hole of a top wall portion of the cap. The cable gland according to claim 2 or 3 ,
The cable gland characterized in that the holding portion has a snap-fit structure and is configured to hold the ferrite core from the outer peripheral surface side. In the cable gland according to any one of claims 1 to 4 ,
The ground main body includes a cylindrical main body portion through which the cable is inserted, and a flange portion projecting outward from the other end portion of the main body portion,
The flange portion is configured to be attachable to the case,
On the outer peripheral surface of the main body portion, a male screw portion to be screwed with the female screw portion is formed,
The sleeve is formed in a cylindrical shape so that the cable can be inserted;
The cable is configured such that when the cap is tightened to the ground body, the sleeve is pressed by the ferrite core, and the sleeve is press-fitted between the body portion and the cable. ground.

Images