CN113795991A

CN113795991A - Clamping body, connector unit and connector unit with electric wire

Info

Publication number: CN113795991A
Application number: CN202080029574.5A
Authority: CN
Inventors: 铃木智幸; 久乡和辉
Original assignee: Japan Aviation Electronics Industry Ltd
Current assignee: Japan Aviation Electronics Industry Ltd
Priority date: 2019-06-12
Filing date: 2020-04-23
Publication date: 2021-12-14
Anticipated expiration: 2040-04-23
Also published as: WO2020250575A1; JP6748763B1; CN113795991B; JP2020202117A

Abstract

The coated electric wire is restrained from being twisted by relative rotation with respect to the holder while the coated electric wire is held. The holder for holding the covered electric wire in a state of being attached to the attachment member has an annular base portion and a holding portion for holding the covered electric wire inserted into the base portion. The holding portion is provided with a plurality of extending portions extending from the base portion toward a central axis direction of the base portion, the plurality of extending portions surrounding the coated electric wire inserted into the base portion, the extending portions being arranged in a circumferential direction of the base portion, and the extending portions extending from the base portion in a state where the extending portions adjacent in the circumferential direction are elastically deformable so as to contact each other. The holding portion has a first surface provided at a distal end portion of the extending portion, and a second surface located at a position different from the first surface in a circumferential direction at the distal end portion of the extending portion. The first surface presses the outer peripheral surface of the coated electric wire in a state where the adjacent extending portions are in contact with each other, and the second surface is positioned radially outward of the first surface.

Description

Clamping body, connector unit and connector unit with electric wire

Technical Field

The present invention relates to a clamping body, and more particularly, to a clamping body that holds a covered electric wire connected to a connector in a state of being attached to a predetermined member.

Furthermore, the present invention relates to a connector unit having a clamping body and a connector unit with an electric wire.

Background

It is known to use a retaining clip for holding a covered wire connected to a connector in a state of being attached to a predetermined member. Examples of the clamping member include a retaining member 100 described in patent document 1 and a cable clamp 200 described in patent document 2.

As shown in fig. 35, the retaining member 100 has an annular member 101 and a plurality of column members 102. The column member 102 extends vertically from the circumferential edge of the annular member 101, and a projection 103 is provided on the inner surface side near the tip of the column member 102. With this configuration, the convex portion 103 bites into the cable 104 inserted into the annular member 101, and the cable 104 can be prevented from coming off. As shown in fig. 36, when the cable 104 is inserted into the cylindrical cover body 105 and the cover body 105 is fitted to a connector body not shown, the inner peripheral surface of the cover body 105 is narrowed toward the cable insertion through-hole, the vicinity of the convex portion 103 of the retaining member 100 is elastically displaced so as to be narrowed, and the convex portion 103 sufficiently bites into the cable 104.

As shown in fig. 37, the cable clamp 200 is cylindrical in shape, and holds the cable inserted into the inside thereof. More specifically, as shown in fig. 37, the cable clamp 200 is provided with a plurality of comb teeth 201 formed in a curved shape. The cable clamp 200 is fitted into a fastening nut, not shown, and the bent portions of the comb teeth 201 are pressed toward the cable side by the inner peripheral surface of the fastening nut. Since slits are formed between the comb teeth 201, the respective comb teeth 201 are elastically displaced by being pressed by the fastening nut, and the distal end projections 202 provided at the distal end portions of the comb teeth 201 bite into the cable.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2009-259419

Patent document 2: japanese patent laid-open No. 2008-186670

Disclosure of Invention

Technical problem to be solved by the invention

However, in the retaining member 100 described in patent document 1, as shown in fig. 35, since the column member 102 has a relatively thin shape, if a twisting force acts on the cable 104 held by the retaining member 100, the column member 102 may rotate together with the cable 104 and twist.

In the cable clamp 200 described in patent document 2, when the plurality of comb teeth 201 are pressed by the fastening nut and elastically displaced, the comb teeth 201 are brought into close contact with each other. In this case, even if a twisting force acts on the cable, the torsional deformation of each comb 201 is restricted by the comb 201 disposed on both sides thereof. However, in the cable clamp 200, since the contact surface with the cable is flat in the distal end protrusion 202 of the comb 201, if a twisting force is applied to the cable, the cable may rotate relative to the cable clamp 200. As a result, a load is generated at a connection portion between the cable and the connector, and the cable may be disconnected due to the load.

The present invention has been made to solve the above-described problems of the conventional art, and an object of the present invention is to provide a clamping body capable of suppressing the coated electric wire from being twisted by relative rotation with respect to the clamping body while the coated electric wire is held.

Another object of the present invention is to provide a connector unit including the above-described clamping body and a connector unit with an electric wire.

Means for solving the problems

In order to achieve the above object, a clamping body according to the present invention is a clamping body for holding a covered electric wire connected to a connector in a state of being attached to an attachment member, the clamping body including a ring-shaped base portion into which the covered electric wire is inserted and a holding portion for holding the covered electric wire inserted into the base portion; a plurality of extending parts extending from the base part to the central axis direction of the base part are arranged in the circumferential direction of the base part on the holding part; a plurality of extending portions surrounding the covered electric wire inserted into the base portion, the extending portions being extended from the base portion in a state where circumferentially adjacent extending portions are capable of being elastically displaced so as to be in contact with each other; the holding part has a first surface provided at the front end of the extension part and a second surface provided at the front end of the extension part and located at a position different from the first surface in the circumferential direction; the first surface presses the outer peripheral surface of the coated electric wire in a state where the circumferentially adjacent extending portions are in contact with each other, and the second surface is located outward of the first surface in the radial direction of the base portion.

In the clamping body according to the present invention, it is preferable that the distal end portions of the plurality of extending portions have a first surface at a radially inner end position, and have a second surface at a position different from the first surface in the circumferential direction.

In the clamping body according to the present invention, it is preferable that the distal end portions of the plurality of extending portions have projecting portions projecting radially inward, and that the first surface and the second surface are present on radially inward end surfaces of the projecting portions.

Further, in the clamping body according to the present invention, it is preferable that a part of an inner end of the protruding portion in the radial direction is notched, and the second surface is present in the notched portion in the inner end of the protruding portion in the radial direction.

Further, in the clamping body according to the present invention, it is preferable that a corner portion of an inner end in the radial direction of the protruding portion is notched, and the second surface is present in the notched corner portion in the inner end in the radial direction of the protruding portion.

In the holder according to the present invention, it is preferable that a coupling surface that couples the first surface and the second surface is further present on an inner end surface in the radial direction of the protruding portion, and a length of the first surface in the circumferential direction is longer than a total of a length of the second surface in the circumferential direction and a length of the coupling surface in the circumferential direction.

In the holder according to the present invention, it is preferable that the length of the coupling surface in the radial direction is equal to or greater than the length of the second surface in the circumferential direction.

In the holder according to the present invention, it is preferable that the extension portions have the same shape.

In the holder according to the present invention, the distal end portions of the plurality of extending portions may have a projection projecting radially inward; the length of the protruding portion in the radial direction is different between the circumferentially adjacent extending portions; in circumferentially adjacent ones of the extensions, an end surface on an inner side of the radially protruding portion in the extension having the longer length of the radially protruding portion is a first surface, and an end surface on an inner side of the radially protruding portion in the extension having the shorter length of the radially protruding portion is a second surface.

Further, in the gripping body of the present invention, it is preferable that the plurality of extending portions are elastically displaced in such a manner that end surfaces of the extending portions adjacent to each other in the circumferential direction of the protruding portion contact each other.

In the present invention, it is preferable that the base portion is provided with a fitting portion that can be fitted to a fitted portion provided in the mounting member.

Further, the connector unit of the present invention includes: any of the above-described gripping bodies; a connector; a housing as a mounting member accommodating the connector therein; a wire leading-out portion provided in the housing for leading out the covered wire connected to the connector to the outside of the housing; and a fastening member which is fitted to the clamping body to elastically displace the plurality of extending portions, and which is assembled to the wire leading-out portion to fasten the clamping body and the wire leading-out portion.

In the connector unit according to the present invention, it is preferable that the fastening member is a compression nut, and an inner peripheral surface of a portion of the compression nut that is assembled to the wire lead-out portion is provided with a thread forming surface on which a thread that engages with a thread formed on an outer peripheral surface of the wire lead-out portion is formed; an inner peripheral surface of a portion of the compression nut fitted to the clamping body is provided with a tapered surface which decreases in inner diameter of the compression nut as the distance from the thread forming surface increases; when the compression nut is screwed into the wire lead-out portion, the tapered surface presses the plurality of extending portions inward in the radial direction, respectively, to elastically displace the plurality of extending portions.

In addition, in the connector unit according to the present invention, it is preferable that the connector unit further includes a cylindrical waterproof member disposed in both a gap between an outer peripheral surface of the covered wire and an inner peripheral surface of the wire lead-out portion and a gap between the outer peripheral surface of the covered wire and the inner peripheral surface of the base portion in a radial direction.

The connector unit with an electric wire according to the present invention includes any one of the connector units described above and the covered electric wire.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, in a state where the holder holds the covered electric wire, the plurality of extending portions of the holding portion of the holder are elastically displaced, and the extending portions adjacent to each other in the circumferential direction are in contact with each other. This can suppress the extension portion itself from twisting together with the cable.

Further, the first surface provided at the end portion position of the distal end portion of at least a part of the extended portion on the inner side in the radial direction presses the outer peripheral surface of the covered electric wire, and the second surface provided at the position different from the first surface in the circumferential direction at the distal end portion of at least a part of the extended portion is positioned on the outer side in the radial direction than the first surface. That is, by the presence of the first surface and the second surface whose positions in the radial direction are different from each other, the recess is provided in the range where the second surface is located in the circumferential direction. Further, a part of the outer peripheral portion (i.e., the covering portion) of the covered electric wire protrudes (enters) into the recess, and the portion entering the recess restricts relative rotation of the covered electric wire with respect to the holder. Thus, twisting of the covered electric wire and disconnection caused thereby can be suppressed.

Drawings

Fig. 1 is an exploded view of a connector unit with electric wires of the present invention.

Fig. 2 is a plan view of the connector unit with electric wires according to the present invention before the compression nut is tightened.

Fig. 3 is a side view of the connector unit with electric wire according to the present invention in a state before tightening the compression nut.

Fig. 4 is a view showing a cross section of the connector unit with the electric wire of the present invention cut at the position of the end face of the compression nut, showing a state before the compression nut is fastened.

Fig. 5 is a cross-sectional view of the connector unit with the electric wire shown in fig. 2, as viewed from a-a.

Fig. 6 is a detailed view of the periphery of the covered electric wire in fig. 4.

Fig. 7 is a plan view of the connector unit with electric wires according to the present invention in a state where the compression nut is fastened.

Fig. 8 is a side view of the connector unit with electric wires according to the present invention in a state where the compression nut is tightened.

Fig. 9 is a view showing a cross section of the connector unit with the electric wire of the present invention cut at the end face position of the compression nut, showing a state after the compression nut is fastened.

Fig. 10 is a view of the wired connector unit shown in fig. 7 as viewed in a B-B section.

Fig. 11 is a detailed view of the periphery of the covered electric wire in fig. 9.

Fig. 12 is a perspective view of the clamping body according to the first embodiment of the present invention before deformation.

Fig. 13 is a side view of the holder according to the first embodiment of the present invention before deformation.

Fig. 14 is a front view of the clamping body according to the first embodiment of the present invention before deformation.

Fig. 15 is a perspective view of the clamping body according to the first embodiment of the present invention after deformation.

Fig. 16 is a side view of the clamping body according to the first embodiment of the present invention after deformation.

Fig. 17 is a front view of the clamping body according to the first embodiment of the present invention after deformation.

Fig. 18 is a diagram showing a state in which a cable is held by a holder according to a conventional example.

Fig. 19 is a perspective view of a clamping body according to a second embodiment of the present invention before deformation.

Fig. 20 is a front view of a clamping body according to a second embodiment of the present invention before deformation.

Fig. 21 is a perspective view of a modified clamping body according to a second embodiment of the present invention.

Fig. 22 is a front view of a modified clamping body according to a second embodiment of the present invention.

Fig. 23 is a view showing a cross section of the connector unit in which the electric wire with the clamp body of the second example is assembled is cut at the end face position of the compression nut, and shows a state before the compression nut is fastened.

Fig. 24 is a detailed view of the periphery of the covered electric wire in fig. 23.

Fig. 25 is a view showing a cross section of the connector unit in which the electric wire with the clamp body of the second example is assembled is cut at the end face position of the compression nut, and shows a state after the compression nut is fastened.

Fig. 26 is a detailed view of the periphery of the covered electric wire in fig. 25.

Fig. 27 is a perspective view of a clamping body according to a third embodiment of the present invention before deformation.

Fig. 28 is a front view of a clamping body according to a third embodiment of the present invention before deformation.

Fig. 29 is a perspective view of a clip body according to a third embodiment of the present invention after deformation.

Fig. 30 is a front view of a modified clamping body according to a third embodiment of the present invention.

Fig. 31 is a view showing a cross section of a connector unit in which a live wire incorporating a clamp of the third example is cut at an end surface position of a compression nut, and shows a state before the compression nut is fastened.

Fig. 32 is a detailed view of the periphery of the covered electric wire in fig. 31.

Fig. 33 is a view showing a cross section of a connector unit in which a live wire incorporating the clamp body of the third example is cut at an end surface position of the compression nut, and shows a state after the compression nut is fastened.

Fig. 34 is a detailed view of the periphery of the covered electric wire in fig. 33.

Fig. 35 is a view showing a conventional example of the retaining member as a clamping body.

Fig. 36 is a view showing a state in which the retaining member shown in fig. 35 is attached to a cable.

Fig. 37 is a diagram showing a conventional clamping nut as a clamping body.

Reference numerals

10. 10S, 10T connector unit 12 with electric wire, cover electric wire 14, connector 16 case (mounting member)

18-joint part set 20 connector unit 22 lining (waterproof member) 23 raised part

24 gland nut (fastening member) 25 thread tooth forming surface 26

conical surface

30, 30S, 30T cable clamp (clamping body)

31 base 32 fitting recess (fitting part) 33 holding part 34 extending part 35 protruding part 35A long protruding part 35B short protruding part 36 long region 37 short region 38 first surface 39 second surface 40 connecting surface

61 housing body 62 flange 63 wire lead out 64 connector receiving part 65 fixing screw

66 seal holding groove 67 seal 68 through hole 69 fitting projection (fitted portion) 71 housing

72 wire 73 covering part 100 anti-slip member 101 annular member 102 column member 103 convex part

104 cable 105 cover main body 200 cable clamp 201 front end projection C0 center shaft

Detailed Description

The clamping body, the connector unit, and the connector unit with an electric wire according to the present invention will be described below with reference to preferred embodiments shown in the drawings.

The embodiments described below are merely examples for facilitating understanding of the present invention, and do not limit the present invention. That is, the present invention may be modified or improved from the embodiments described below, as long as the present invention does not depart from the gist thereof. In particular, the material, design dimensions, and the like of each member used in the present invention can be freely set according to the application of the present invention, the technical standard of the timing of carrying out the present invention, and the like. Further, it is a matter of course that the present invention includes equivalents thereof.

< example of configuration of connector unit with electric wire >)

A configuration of a first example of the connector unit 10 with an electric wire according to the present invention will be described with reference to fig. 1 to 11. Fig. 1 to 11 are explanatory views of the connector unit 10 with electric wires. Fig. 2 to 6 are diagrams showing a state before tightening of the compression nut 24 described later, and fig. 7 to 11 are diagrams showing a state after tightening of the compression nut 24.

In each of fig. 1 to 11, the X direction, the Y direction, and the Z direction are shown as three directions orthogonal to each other, and the direction in which the coated electric wire 12 is drawn out from the housing 16 described later is referred to as the X direction. The direction away from the housing 16 in the X direction is set to + X side, and the opposite direction is set to-X side. The vertical direction of the housing 16 corresponds to the Z direction, and the upper side of the housing 16 is set to the + Z side and the lower side of the housing 16 is set to the-Z side.

Fig. 4 and 9 are cross-sectional views taken at a cutting plane (YZ plane) located at the same position as the + X-side end surface of the compression nut 24, and the same applies to fig. 23, 25, 31, and 33 described later.

The wired connector unit 10 is used as a power supply device for an object to be mounted such as a motor, and includes a covered wire 12 shown in fig. 1 and the like and a connector 14 (see fig. 5 and 10) connected to the covered wire 12. If the connector 14 is connected to a mating connector, not shown, provided on the mounting object side, electric power is supplied from a power source, not shown, to the mounting object main body through the covered electric wire 12.

As shown in fig. 1 to 11, the wired connector unit 10 is configured by combining a covered wire 12, a connector 14, a housing 16 for housing the connector, and a joint member set 18 shown in fig. 1. The covered electric wire 12 having the terminal connected to the connector 14 is led out of the housing 16 from the inside of the housing 16, and the led-out portion is attached to the housing 16 by the joint member group 18.

As shown in fig. 1, the joint member set 18 includes: a bushing 22 as a waterproof member, a compression nut 24 as a fastening member, and a cable clamp 30 as a clamping body. When the covered wire 12 is attached to the housing 16, the covered wire 12 drawn out of the housing 16 is inserted into the bush 22, a part of the bush 22 (more specifically, a part of approximately a half of the + X side) is fitted into the cable clamp 30, and the housing 16 is assembled with the compression nut 24 in a state where the cable clamp 30 is fitted inside.

In the embodiment shown in fig. 1 to 11, the connector unit 10 with an electric wire forms a waterproof structure. That is, as shown in fig. 5 and 10, the connector 14 is covered with the housing 16. Further, a gap between the opening portion of the case 16 from which the covered electric wire 12 is drawn and the covered electric wire 12 is sealed by the bush 22. This prevents water from entering the housing 16 through the gap.

The portion of the wired connector unit 10 other than the covered electric wire 12 corresponds to a connector unit 20, and is constituted by a connector 14, a housing 16, and a joint member set 18. Hereinafter, each constituent device of the connector unit 10 with an electric wire will be described.

(case)

The housing 16 is a device for housing the connector 14, corresponds to a mounting member for mounting the covered electric wire 12, and includes a housing main body 61, a flange 62, and an electric wire drawing portion 63 as shown in fig. 1 to 5. The housing main body 61 is a box-shaped member having a closed + Z-side end and an open-Z-side end, and has a concave connector accommodating portion 64 formed therein. The flange 62 protrudes in a rectangular shape from the outer peripheral portion of the-Z-side end portion of the case main body 61. Fixing holes are provided at four corners of the flange 62, and the housing 16 is fixed to an object to be attached by fixing screws 65 inserted through the fixing holes.

As shown in fig. 5 and 10, a seal retaining groove 66 closed so as to surround the connector accommodating portion 64 is formed on a surface of the flange 62 facing in the-Z direction. A seal 67 made of an elastic body such as rubber is sealed in the seal holding groove 66 in an elastically compressed state. In this state, the case 16 is fixed to the object to be attached with the fixing screws 65, thereby sealing the gap between the flange 62 and the surface of the object to be attached and improving the waterproof performance.

The wire drawing portion 63 is an annular portion protruding from the + X side surface of the housing main body 61 toward the + X side. A through hole 68 is provided in the + X side wall of the housing main body 61 so as to communicate the inside of the wire lead-out portion 63 with the connector accommodating portion 64. The covered electric wire 12 connected to the connector 14 in the connector housing 64 is drawn out of the housing 16 through the wire drawing portion 63.

The wire drawing portion 63 is not limited to projecting from the + X side surface of the case main body 61 to the + X side, and may project from the-X side surface of the case main body 61 to the-X side.

As shown in fig. 5 and 10, a step is provided at a halfway position in the X direction on the inner peripheral surface of the wire lead-out portion 63, and the inner diameter of the range located on the-X side of the step is smaller than the inner diameter of the range located on the + X side of the step.

As shown in fig. 1, fitting projections 69 projecting toward the + X side are provided at the end of the wire lead-out portion 63 on the + X side at regular intervals in the outer circumferential direction of the wire lead-out portion 63. Although not shown in fig. 1 and the like, a thread (strictly, a male thread) is formed at the end on the + X side of the outer peripheral surface of the wire drawing portion 63.

(connector)

The connector 14 is connected to a mating connector, not shown, attached to an object to be mounted in the Z direction. The connector 14 includes a terminal, not shown, and a housing 71 made of an insulating material for holding the terminal. When the lower end of the housing 71 is fitted to the housing of the mating connector, the terminal provided in the connector 14 is electrically connected to the terminal provided in the mating connector.

(coated wire)

The covered electric wire 12 is composed of, for example, a cable (cable bundle), and as shown in fig. 6, includes a plurality of electric wire portions 72 that are insulated from each other, and a covering portion 73 that surrounds the plurality of electric wire portions 72. The plurality of wire portions 72 are connected at their respective end portions to terminals provided in the connector 14. The covering portion 73 is made of an insulating material having elasticity, and has a cylindrical shape whose outer diameter is smaller than the inner diameter of the wire drawing portion 63.

As shown in fig. 5 and 10, the end of the covered electric wire 12 connected to the connector 14 is accommodated in the connector accommodating portion 64 together with the connector 14. On the other hand, most of the covered wire 12 is drawn out of the case 16 from the wire drawing portion 63.

The covered electric wire 12 is not limited to a cable having a plurality of electric wire portions 72, and may be, for example, an insulated electric wire having only one portion corresponding to the electric wire portion 72.

(Bush)

The bush 22 is a flexible rubber cylindrical body, and as shown in fig. 5 and 10, the covered electric wire 12 is fitted into the electric wire lead-out portion 63 while passing through the inside of the bush 22. More specifically, the bush 22 is fitted into the range of the + X side of the step formed at the halfway position in the X direction in the internal space of the wire lead-out portion 63. Thereby, the gap between the inner peripheral surface of the wire lead-out portion 63 and the covered wire 12 is sealed, and water is stopped in the gap.

As shown in fig. 1, a raised portion 23 slightly raised from the outer peripheral surface of the bush 22 is provided in a region of the outer peripheral surface of the bush 22 located slightly toward the + X side from the-X side end position. By providing such a raised portion 23, the adhesion between the bush 22 and the inner peripheral surface of the wire lead-out portion 63 is improved, and thereby the waterproof performance of the bush 22 can be exhibited appropriately.

(pressing nut)

The compression nut 24 is a cylindrical fastening member, and is assembled to the wire lead-out portion 63 of the housing 16 in a state in which the cable clamp 30 is fitted inside the compression nut 24 (see fig. 2 to 5 and 7 to 10). Thereby, the cable clamp 30 and the wire lead-out portion 63 are fastened by the compression nut 24.

More specifically, the rear (-X side) end of the compression nut 24 is attached to the wire lead-out portion 63, and the inner peripheral surface of this portion includes a thread forming surface 25 on which a thread (female thread) is formed. That is, the thread forming surface 25 faces the outer peripheral surface of the wire drawing portion 63, and the rear end portion (-X side end portion) of the compression nut 24 is fitted to the wire drawing portion 63 by the thread of the thread forming surface 25 engaging with the thread formed on the wire drawing portion 63 side. In fig. 5 and 10, the thread of the thread forming surface 25 is omitted for convenience of illustration.

The front end (+ X side) of the gland nut 24 is a portion into which the cable clamp 30 is fitted, and the inner peripheral surface of the portion includes a tapered surface 26 whose inner diameter gradually decreases toward the + X side (in other words, away from the thread forming surface 25). If the gland nut 24 is screwed into the wire lead-out portion 63 in a state where the cable clamp 30 is fitted into the gland nut 24, the tapered surface 26 is opposed to the holding portion 33 of the cable clamp 30. Thereby, the plurality of extending portions 34 of the holding portion 33 are pressed by the tapered surface 26 and elastically displaced. The inner diameter of the tapered surface 26 at the tip (+ X-side end) of the tapered surface 26 is smaller than the outer diameter of the cable holder 30 at normal time (time before deformation).

(Cable clamp)

The cable clamp 30 is a cylindrical elastic body that holds (clamps) the covered electric wire 12 connected to the connector 14 in a state of being attached to the housing 16, and the covered electric wire 12 is inserted into the inner side thereof. The cable clamp 30 according to the first embodiment of the present invention has the external shape shown in fig. 12 to 14 when holding the coated wire 12, and is elastically deformed to have the external shape shown in fig. 15 to 17 when holding the coated wire 12. Fig. 12 to 17 are explanatory views of a cable clamp 30 according to a first example of the present invention, and each of the drawings shows the X, Y, Z direction as in fig. 1 to 11.

As shown in fig. 12 to 17, the cable clamp 30 includes a ring-shaped base 31 into which the covered electric wire 12 is inserted, and a holding portion 33 that holds the covered electric wire 12 inserted into the base 31. In the holding portion 33, a plurality of extending portions 34 extending from the base portion 31 in the central axis direction of the base portion 31 are arranged in a row along the circumferential direction of the base portion 31. In the wired connector unit 10, the cable clamp 30 is disposed with the center axis C0 (see fig. 12 and 14) of the base 31 along the X direction. Therefore, the plurality of extending portions 34 extend in the X direction.

Here, the circumferential direction around the central axis C0 is a direction corresponding to the circumferential direction of the base 31, and is hereinafter referred to as the R direction. In the following, as shown in fig. 14, 17 and the like, in the R direction when viewed from the + X side, the clockwise direction is set to the + R side, and the counterclockwise direction is set to the-R side. In the following description, for convenience of explanation, the + X side end of the cable clamp 30 is referred to as the front end, and the-X side end is referred to as the rear end.

The inner diameter of the base 31 is slightly larger than the outer diameter of the covered electric wire 12 and slightly larger than the outer diameter of the bush 22. The outer diameter of the base 31 is substantially equal to the outer diameter of the wire lead-out portion 63 of the housing 16, and is slightly smaller than the inner diameter of the thread forming surface 25 in the compression nut 24. Further, the entire length (length in the X direction) of the base 31 is shorter than the entire length of the bush 22 as shown in fig. 5 and 10.

As shown in fig. 12, 13, and the like, a fitting recess 32 having an isosceles trapezoid shape is provided at the rear end of the base 31 at a predetermined interval in the R direction. One of the fitting projections 69 provided on the wire drawing portion 63 of the housing 16 can be fitted into each fitting recess 32. Here, the fitting recess 32 corresponds to a fitting portion provided in the cable clamp 30, and the fitting projection 69 corresponds to a fitted portion provided in the wire lead-out portion 63, but the cable clamp 30 may also include a projection corresponding to the fitting projection 69, and in this case, a recess corresponding to the fitting recess 32 is provided in the wire lead-out portion 63.

The holding portion 33 has a plurality of extending portions 34 arranged in a circle at regular intervals in the R direction. The number of the extending portions 34 included in the holding portion 33 is not particularly limited as long as it is two or more, and is preferably three to six, and more preferably six.

The plurality of extending portions 34 surround the covered electric wire 12 as shown in fig. 6 in a state where the covered electric wire 12 is inserted into the base portion 31. Further, a slit-like gap is provided between the extending portions 34 adjacent in the R direction. That is, each of the plurality of extending portions 34 extends from the base portion 31 in a state of being elastically displaceable so that the position of the protruding portion 35 changes in the radial direction. The holding portion 33 is deformed so as to be narrowed as shown in fig. 15 to 17 when holding the covered electric wire 12.

Each of the plurality of extending portions 34 has the same shape, extends in the R direction to have a small width (lateral width), and has the same thickness as the thickness of the base portion 31. However, the present invention is not limited to this, and the width and thickness of the extension portions 34 may be different between the extension portions 34. Further, two extending portions 34 adjacent to each other with a gap therebetween in the R direction have a pair of side surfaces (end surfaces in the R direction) opposed to each other with a gap therebetween, the pair of side surfaces being planes along each other.

As shown in fig. 12 and the like, each of the extending portions 34 extends in parallel with the central axis C0 in a normal state (at a time before elastic displacement). The extending portion 34 is not limited to extending parallel to the center axis C0, and may be slightly inclined with respect to the center axis C0, or may extend in a direction intersecting the center axis C0.

The distal end of each extending portion 34 is bent into an L-shape, and has a protruding portion 35 that protrudes inward in the radial direction (hereinafter simply referred to as "radial direction") of the base portion 31. As shown in fig. 14 and the like, the protruding portion 35 is substantially fan-shaped in front view, and when the holding portion 33 holds the coated electric wire 12, the radially inner end surface of the protruding portion 35 abuts against the outer peripheral surface of the coated electric wire 12 (more precisely, the outer peripheral surface of the coated portion 73) and presses the coated portion 73.

The shape of the distal end of the extending portion 34 may be other than an L shape as long as it is pressed by the tapered surface 26 of the inner peripheral surface of the compression nut 24 and elastically displaced radially inward when the compression nut 24 is screwed in.

In the cable clamp 30 according to the first example of the present invention, as shown in fig. 12 to 17, the radially inner end of the protruding portion 35 is partially notched in each of the extending portions 34. More specifically, a corner portion in the radially inner end portion of the protruding portion 35 (strictly, a corner portion on the-R side) is notched in a substantially trapezoidal shape and accordingly recessed radially outward. That is, the protruding portion 35 of each extending portion 34 is provided with a long portion region 36 having a long protruding length due to being not notched, and a short portion region 37 having a protruding length reduced by the amount of notch.

The long portion region 36 is a region occupying the most part of the protruding portion 35. The surface of the long portion region 36 at the radially inner end position is a first surface 38, which faces the outer surface of the covered electric wire 12 inserted into the cable clamp 30, and presses the covering portion 73 by abutting against the outer peripheral surface of the covered electric wire 12 when the holding portion 33 holds the covered electric wire 12. The first surface 38 is preferably a curved surface curved in the R direction so as to fit the outer peripheral surface of the cable clamp 30, but is not limited thereto and may be a flat surface.

The short portion region 37 is adjacent to the long portion region 36 on the-R side, and has a second surface 39 and a connecting surface 40 at a radially inner end position. The second surface 39 is located at a position different from the first surface 38 in the R direction, and is located most to the-R side in the R direction in the first example. As shown in fig. 14, the second surface 39 is present in a notched portion (specifically, a corner portion on the-R side) at the radially inner end of the protruding portion 35, and is offset radially outward from the first surface 38. The second surface 39 may be a curved surface curved in the R direction, or may be a flat surface.

As shown in fig. 14, the connecting surface 40 is located between and connected to the first surface 38 and the second surface 39 in the R direction, and a step is formed between the first surface 38 and the second surface 39. In the first example, the coupling surface 40 is an inclined surface inclined to be more toward the-R side as it goes radially outward, but is not limited thereto, and may be a surface along the radial direction.

Further, if the lengths of the first surface 38, the second surface 39, and the connecting surface 40 in the R direction are w1, w2, and w3, the following relational expression (1) is established.

w1>w2+w3 (1)

In the present embodiment, by establishing the above-described relational expression (1), even if the corner portion of the protruding portion 35 is notched, the strength of the protruding portion 35 can be sufficiently ensured.

Further, if the length in the radial direction of the coupling surface 40 (in other words, the size of the step provided between the first surface 38 and the second surface 39) is h, the following relational expression (2) is established.

h≥w2 (2)

Further, if the length h in the radial direction of the connecting surface 40, that is, the size of the step is excessively increased, the strength of the protruding portion 35 (particularly, the long portion region 36) is reduced and there is a possibility of deformation, and therefore the length h may be about the same as the length w2 in the R direction of the second surface 39.

< assembling step of connector Unit with electric wire >)

The procedure of assembling the connector unit with electric wire 10 of the above-described configuration (first example) will be described.

First, after the terminal portion of the covered wire 12 is connected to the connector 14, the connector 14 is accommodated in the housing 16, and the covered wire 12 is drawn out to the outside of the housing 16 from the wire drawing portion 63 of the housing 16.

The covered electric wire 12 led out to the outside of the case 16 passes through the inside of the cylindrical bush 22 as shown in fig. 1. The bush 22 is attached to the wire lead-out portion 63 by a part thereof being fitted into the wire lead-out portion 63. More specifically, as shown in fig. 5, the bush 22 is fitted into the wire lead-out portion 63 until the-X-side end surface of the bush 22 comes into contact with a step provided on the inner peripheral surface of the wire lead-out portion 63. In a state where the-X-side end surface of the bush 22 is in contact with the step on the inner peripheral surface of the wire drawing portion 63, substantially half of the bush 22 in the X direction protrudes from the wire drawing portion 63 to the + X side.

As shown in fig. 1 and 5, the cable clamp 30 is embedded in a portion of the bush 22 that protrudes to the + X side from the wire lead-out portion 63. The cable clamp 30 is disposed at a position where the rear end (end on the X side) of the base 31 contacts the wire lead-out portion 63 in the X direction. At this time, the fitting projection 69 provided at the + X-side end of the wire drawing portion 63 is fitted into the fitting recess 32 formed at the rear end of the base 31, and as a result, rotation (relative rotation) of the cable clamp 30 with respect to the wire drawing portion 63 is suppressed.

When the cable clamp 30 is completely attached, the bush 22 is interposed in the radial direction between the outer peripheral surface of the covered electric wire 12 and the inner peripheral surface of the wire lead-out portion 63 and between the outer peripheral surface of the covered electric wire 12 and the inner peripheral surface of the base portion 31 of the cable clamp 30, and fills these gaps. Thereafter, if the compression nut 63 is fitted and screwed into the wire lead-out portion 63, a waterproof structure is formed, and entry of water into the connector housing portion 64 can be prevented.

Further, the plurality of extending portions 34 provided in the holding portion 33 of the cable clamp 30 each have a tip portion bent in an L shape, and as shown in fig. 5, the tip portion abuts against the + X-side end portion of the bush 22. This can suppress the end portion of the bush 22 on the + X side from being curled up.

After the cable clamp 30 is attached to the predetermined position, the compression nut 24 is assembled to the wire drawing portion 63. In more detail, as shown in fig. 5, the cable clamp 30 and the wire lead-out portion 63 are embedded inside the gland nut 24. Thereby, the thread forming surface 25 in the inner peripheral surface of the compression nut 24 is opposed to the outer peripheral surface of the wire lead-out portion 63 in the radial direction, and the thread (male thread) formed on the thread forming surface 25 is engaged with the thread (female thread) formed on the outer peripheral surface of the wire lead-out portion 63. At this time, the compression nut 24 is located at the position shown in fig. 2 and 3 in the X direction.

When the compression nut 24 is screwed from the above state and moved to the-X side, the tapered surface 26 of the inner peripheral surface of the compression nut 24 reaches a position facing the holding portion 33 of the cable clamp 30 in the X direction, and the plurality of (six) extending portions 34 provided in the holding portion 33 are respectively pressed substantially uniformly radially inward. Thereby, the holding portion 33 starts to deform so as to narrow radially inward (in other words, so that the extending portions 34 adjacent in the R direction contact each other). At this time, the + X-side end of the bush 22 is also deformed so as to be narrowed radially inward as the holding portion 33 is deformed (see fig. 10).

Thereafter, if the compression nut 24 is further screwed, the contact portion of the tapered surface 26 with each of the extending portions 34 is displaced radially inward, so that the pressing force from the tapered surface 26 toward each of the extending portions 34 gradually increases, and the amount of deformation of the holding portion 33 also gradually increases. And, if the compression nut 24 is screwed in the X direction to the position shown in fig. 7 and 8, by the deformation of the holding portion 33, as shown in fig. 11, the extending portions 34 adjacent in the R direction are brought into contact with each other at the side of each protruding portion 35. Thereby, each of the extending portions 34 is restricted by the extending portions 34 on both sides thereof, and displacement and deformation (specifically, helical twisting around the central axis C0) of the extending portion 34 in the R direction can be suppressed. As a result, further elastic displacement of the extending portions 34 is prevented, and excessive tightening of the covered electric wire 12 by the cable clamp 30 is suppressed.

In the above state, as shown in fig. 11, the first surface 38 of the radially inner end surface of the protruding portion 35 of each extending portion 34 radially abuts against the outer peripheral surface of the coated electric wire 12 (strictly, the coated portion 73) to press the coated portion 73. That is, the first surface 38 is pressed against the covering portion 73, and the long region 36 of the protruding portion 35 bites into the covering portion 73, whereby the holding portion 33 holds (clamps) the covered electric wire 12.

Further, in a state where the extending portions 34 adjacent to each other in the R direction are in contact with each other on the side surfaces of the respective projecting portions 35, the second surface 39 of the radially inner end surface of the projecting portion 35 of each extending portion 34 is located radially outward of the first surface 38. That is, the projections and recesses are formed in the R direction on the radially inner end surface of the projecting portion 35 of each extending portion 34. The relative rotation of the covered wire 12 with respect to the cable clamp 30 can be effectively suppressed by the irregularities.

To explain it more easily, for example, as shown in fig. 18, when the holding portion 33 of the cable clamp 30 is deformed and narrowed in a case where the projections 35 are not provided with the irregularities on the radially inner end surface, the radially inner end surface of the projection 35 of each extending portion 34 is arranged in a substantially circular shape along the outer peripheral surface of the covered electric wire 12. In such a configuration, the protrusion 35 bites into the coating portion 73 of the coated electric wire 12, whereby the movement of the coated electric wire 12 in the X direction can be restricted, but it is difficult to restrict the rotation (i.e., twisting) of the coated electric wire 12 in the R direction.

In contrast, when the cable clamp 30 according to the first example of the present invention is used, when the holding portion 33 of the cable clamp 30 is deformed and narrowed, a portion of the covering portion 73 of the covered wire 12 pressed by the first surface 38 of the protruding portion 35 is depressed, and the remaining thickness portion of the covering portion 73 is shifted to a position adjacent to the portion and raised. As shown in fig. 11, the residual thickness portion is opposed to the cut portion of each protrusion 35, i.e., the short portion region 37, and enters the cut (i.e., the concave space formed by the second surface 39 and the connecting surface 40). The remaining thickness portion entering the notch functions as a rotation restriction for the covered electric wire 12. Specifically, the connection surface 40, which is a stepped surface of the projections and recesses in the protrusion 35, regulates the rotation of the covered electric wire 12. As a result, the coated electric wire 12 held by the cable clamp 30 can be effectively prevented from twisting and rotating with respect to the cable clamp 30.

In addition, the size of the cutout is preferably a size that ensures the strength of the protruding portion 35 and allows the excess thickness portion to smoothly enter, and in this sense, the lengths of the first surface 38, the second surface 39, and the connecting surface 40 in the R direction preferably satisfy the relational expression (1) and are set to an appropriate length.

If the compression nut 24 is screwed to tighten the cable clamp 30 and the wire lead-out portion 63 of the housing 16, the assembly of the wired connector unit 10 is completed. The completed connector unit 10 with the electric wire is assembled as a part of the object to be mounted by fixing the housing 16 to the surface of the object to be mounted with the fixing screws 65.

< other construction examples >)

The cable clamp, the connector unit, and the wired connector unit according to the present invention have been described above with reference to specific embodiments (specifically, the first example), but the above embodiments are merely examples, and other embodiments are also conceivable in the present invention.

For example, in the above-described embodiment (first example), the projecting portion 35 of the extending portion 34 is notched out of all the plurality of extending portions 34 included in the holding portion 33 of the cable clamp 30, and both the first surface 38 and the second surface 39 are included on the radially inner end surface of the projecting portion 35. However, the present invention is not limited to this, and at least one of the extending portions 34 may be provided with a first surface 38 and a second surface 39 on the radially inner end surface of the protruding portion 35, as long as the protruding portion 35 is notched. That is, only a part of the plurality of extensions 34 may have the notched protrusion 35, and the protrusions 35 of the remaining extensions 34 may not be notched.

In the above-described embodiment (first example), the corner portion of the protruding portion 35 is notched. However, the cut portion in the protruding portion 35 is not particularly limited, and may be any portion, and for example, as shown in fig. 19 to 26, an embodiment (second example) in which the center portion of the protruding portion 35 in the R direction is cut may be considered.

Fig. 19 to 22 are explanatory views of a cable clamp 30S according to a second example of the present invention, and fig. 19 and 20 show a state before deformation, and fig. 21 and 22 show a state after deformation. Fig. 23 and 25 are front views of the wired connector unit 10S to which the cable clamp 30S of the second example is assembled, fig. 23 showing a state before tightening of the compression nut 24, and fig. 25 showing a state after tightening of the compression nut 24. Fig. 24 and 26 are detailed views of the periphery of the covered electric wire 12, fig. 24 is a partially enlarged view of fig. 23, and fig. 26 is a partially enlarged view of fig. 25. In addition, of the devices and components used in the second example, the devices and components common to the first example are denoted by the same reference numerals as in the first example in fig. 19 to 26.

Even when the cable clamp 30S of the second example is used, similarly to the first example, the excess thickness portion of the coating portion 73 of the coated electric wire 12 enters the notch of the protruding portion 35, and thus the rotation of the coated electric wire 12 with respect to the cable clamp 30S can be effectively suppressed.

In the above-described embodiment (first example), both the irregularities (in other words, the first surface 38 and the second surface 39) are provided on the radially inner end surface of each of the projecting portions 35 by cutting each of the projecting portions 35. However, as shown in fig. 27 to 34, an embodiment (third example) in which the length of the radially protruding portion is made different between the extending portions 34 adjacent in the R direction to form the unevenness in the R direction may be considered. That is, by alternately arranging the extending portions 34 having the long protruding portions 35A whose radial length is long and the extending portions 34 having the short protruding portions 35B whose radial length is short in the R direction, it is possible to form irregularities between the extending portions 34. In this case, the radially inner end surface of the long protruding portion 35A corresponds to the first surface 38, and the radially inner end surface of the short protruding portion 35B corresponds to the second surface 39.

Fig. 27 to 34 are explanatory views of a cable clamp 30T according to a third embodiment of the present invention, and fig. 27 and 28 show a state before deformation, and fig. 29 and 30 show a state after deformation. Fig. 31 and 33 are front views of the connector unit 10T with the electric wire to which the cable clamp 30T of the third example is assembled, fig. 31 shows a state before the compression nut 24 is fastened, and fig. 33 shows a state after the compression nut 24 is fastened. Fig. 32 and 34 are detailed views of the periphery of the covered electric wire 12, fig. 32 is a partially enlarged view of fig. 31, and fig. 34 is a partially enlarged view of fig. 33. Note that, of the devices and components used in the third example, those common to the first example are denoted by the same reference numerals as in the first example in fig. 27 to 34.

In the case where the covered electric wire 12 is held by the cable clamp 30T of the third example, the holding portion 33 of the cable clamp 30T is deformed in a narrowed manner, and the extended portions 34 adjacent in the R direction among the plurality of extended portions 34 are in contact with each other. At this time, one of the extending portions 34 has a long protruding portion 35A, and the first surface 38, which is the radially inner end surface of the long protruding portion 35A, abuts against the outer peripheral surface of the coated electric wire 12 and bites into the coating portion 73 of the coated electric wire 12. The other extension portion 34 has a short protruding portion 35B, and a second surface 39, which is an end surface of the short protruding portion 35B on the radially inner side, is positioned radially outward of the first surface 38. That is, in the third example, the long protruding portions 35A are formed as convex portions, the concave portions are formed in the range where the short protruding portions 35B exist between the long protruding portions 35A, and when the long protruding portions 35A bite into the covering portion 73, the remaining thickness portion of the covering portion 73 enters the concave portions. Thus, as in the first example, the rotation of the covered wire 12 with respect to the cable clamp 30T can be effectively suppressed.

In addition, as a structure for forming the irregularities between the extending portions 34, a structure other than the structure in which the length in the radial direction of the protruding portion is made different between the extending portions 34 as described above may be considered, and for example, a structure in which the length (i.e., the axial length) of the extending portion 34 in the X direction is made different between the extending portions 34 may be adopted. For example, by alternately arranging the axially long extending portions 34 and the axially short extending portions 34 in the R direction, irregularities can be formed between the extending portions 34. In the above configuration, each extending portion 34 may not include a portion corresponding to the protruding portion 35, and the tip end portion of each extending portion 34 may extend relatively straight. In this case, when the compression nut 24 is screwed in, the distal end portion of the axially long extending portion 34 is elastically displaced radially inward to a position where it bites into the covering portion 73 of the covered electric wire 12, whereas the distal end portion of the axially short extending portion 34 is elastically displaced by a displacement amount smaller than that of the axially long extending portion 34. That is, in the above configuration, the surface facing radially inward of the distal end portion of the axially long extension portion 34 corresponds to the first surface. On the other hand, the surface facing radially inward of the distal end portion of the axially short extension portion 34 corresponds to the second surface, and is located closer to the base portion 31 in the X direction than the surface facing radially inward (first surface) of the distal end portion of the axially long extension portion 34. Even in the above configuration, when the compression nut 24 is screwed and the extending portions 34 adjacent in the R direction contact each other, the second surface is located radially outward of the first surface.

Claims

1. A clamping body for holding a coated electric wire connected to a connector in a state of being mounted on a mounting member,

has a ring-shaped base portion into which the covered electric wire is inserted, and a holding portion for holding the covered electric wire inserted into the base portion,

a plurality of extending portions extending from the base portion toward a central axis of the base portion are arranged in the holding portion in a circumferential direction of the base portion,

a plurality of the extending portions surrounding the covered electric wire inserted into the base portion, the extending portions extending from the base portion in a state where the extending portions adjacent in the circumferential direction are elastically deformable so as to be in contact with each other,

the holding portion has a first surface provided at a distal end portion of the extending portion, and a second surface provided at a distal end portion of the extending portion and located at a position different from the first surface in the circumferential direction,

the first surface presses an outer peripheral surface of the covered electric wire in a state where the circumferentially adjacent extending portions are in contact with each other, and the second surface is located outward of the first surface in a radial direction of the base portion.

2. The gripping body of claim 1,

the distal end portions of the plurality of extending portions each include the first surface at an inner end position in the radial direction, and have the second surface at a position different from the first surface in the circumferential direction.

3. The gripping body of claim 2,

the plurality of extension portions each have a projection projecting inward in the radial direction at a tip end portion thereof,

the first face and the second face exist at an end face on the radially inner side of the protruding portion.

4. The gripping body of claim 3,

a part of the radially inner end of the protruding portion is notched,

the second face exists in a notched portion in an end portion of the protrusion that is on the inner side in the radial direction.

5. The gripping body according to claim 4,

a corner portion of the radially inner end of the projection is notched,

the second face is present in the corner portion of the notched portion in an end portion of the protruding portion on the radially inner side.

6. The clamping body according to any one of claims 3 to 5,

there is also a coupling surface that couples the first surface and the second surface at an end surface on an inner side in the radial direction of the protruding portion,

the length of the first surface in the circumferential direction is longer than the sum of the length of the second surface in the circumferential direction and the length of the connecting surface in the circumferential direction.

7. The gripping body according to claim 6, wherein the length of the coupling surface in the radial direction is equal to or greater than the length of the second surface in the circumferential direction.

8. The gripping body of any of claims 3-7, wherein each of the extensions is identical in shape.

9. The gripping body of claim 1,

the length of the projection in the radial direction is different between the circumferentially adjacent extensions,

in the circumferentially adjacent ones of the extensions, an end surface on an inner side of the protrusion in the radial direction in the extension in which the length of the protrusion in the radial direction is longer is the first surface, and an end surface on an inner side of the protrusion in the radial direction in the extension in which the length of the protrusion in the radial direction is shorter is the second surface.

10. The gripping body according to any one of claims 3 to 9, wherein the plurality of the extending portions are elastically displaced in such a manner that end surfaces of the extending portions adjacent to each other in the circumferential direction of the protruding portion in the circumferential direction are in contact with each other.

11. The clamp body according to any one of claims 1 to 10, wherein the base portion is provided with an engaging portion that can be engaged with an engaged portion provided in the mounting member.

12. A connector unit, characterized by comprising:

the clamp body according to any one of claims 1 to 11;

the connector;

a housing as the mounting member, accommodating the connector therein;

a wire leading-out portion provided in the housing for leading out the covered wire connected to the connector to the outside of the housing; and

and a fastening member that is fitted to the holder to elastically displace the plurality of extension portions, and is assembled to the wire lead-out portion to fasten the holder and the wire lead-out portion.

13. The connector unit of claim 12,

the fastening member is a compression nut that is,

an inner peripheral surface of a portion of the compression nut that is assembled to the wire lead-out portion includes a thread forming surface on which a thread that engages with a thread formed on an outer peripheral surface of the wire lead-out portion is formed,

an inner peripheral surface of a portion of the compression nut fitted to the clamping body has a tapered surface that decreases in inner diameter as the distance from the thread forming surface increases,

when the compression nut is screwed into the wire lead-out portion, the tapered surface presses the plurality of extension portions toward the inside in the radial direction, respectively, and the plurality of extension portions elastically displace.

14. Connector unit according to claim 12 or 13,

the wire drawing member is disposed in the radial direction between the outer peripheral surface of the covered wire and the inner peripheral surface of the wire drawing portion, and between the outer peripheral surface of the covered wire and the inner peripheral surface of the base portion.

15. A connector unit with an electric wire, characterized by comprising the connector unit according to any one of claims 12 to 14 and the covered electric wire.