TWI646738B - Electric connector - Google Patents

Abstract

An object of the present invention is to provide a technique for simplifying the structure, reducing the number of parts, and easily assembling an electrical connector used for a cable having an external conductor, which can improve workability and connection reliability. The means for solving the problem is an electrical connector, which is provided with a cylindrical metal casing (10), and is housed inside the casing (10), and is used for the outer conductor (53) of the cable (50) ) The holding fastener (20) to be riveted and fixed; and a groove installed on the inner side of the casing (10), a ring-shaped elastic fixing device (30) for restricting the movement of the holding fastener (20), and the holding fastener (20) ) Has a tongue-shaped first contact piece (22) in contact with the housing (10), and a tongue-shaped second contact piece (23) located on the opposite side of the first contact piece and in contact with the elastic fixture, and holds the fastener ( 20) is fixed in the casing (10) by the elastic thrust of the elastic fixture (30).

Description

Electric connector

The present invention relates to an electrical connector, and more particularly to a cable fixing structure for an electrical connector.

Cables (shielded wires, etc.) used as high-voltage, high-current wires. In order to block electrical noise such as electromagnetic waves and static electricity, the structure is covered with an outer conductor (braided wire) and covered with an endothelium core. The outer side of the outer side is further covered with an outer sheath (sheath) for insulation coating. In order to connect the outer conductor of such a cable to the metal case of a machine, a special electrical connector has been used in the past. In addition, examples of the technology related to such an electrical connector include the technology described in Patent Document 1 (Japanese Patent Application Laid-Open No. 11-126656).

[Advanced technical literature] [Patent Literature]

[Patent Document 1] Japanese Unexamined Patent Publication No. 11-126656

However, the conventional electrical connector has problems such as a large number of parts, a complicated structure, a laborious assembly time, and insufficient shielding properties. Therefore, an object of the present invention is to provide a technique for simplifying the structure, reducing the number of parts, and easily assembling an electrical connector used for a cable having an external conductor, which can improve workability and connection reliability.

The foregoing and other objects and novel features of the present invention can be clearly understood from the description and drawings of the present specification.

The representative structure of the invention disclosed in this case is briefly explained as follows: That is, the electrical connector of the invention is characterized by having: a cylindrical metal case; and the inside of the case is housed for externally connecting the cable. A riveting fastener with the conductor riveted and fixed; and a groove mounted on the inner side of the housing, a ring-shaped elastic fixing device for restricting the movement of the holding fastener, the holding fastener is provided with a tongue-shaped first contact piece in contact with the housing, and The tongue-shaped second contact piece on the opposite side of the first contact piece and in contact with the elastic fixture, the holding fastener is fixed in the housing by the elastic pushing force of the elastic fixture.

In the invention disclosed in this case, the effect obtained by simply explaining the representative structure is as follows:

(1) The structure is simple, the number of parts is small, and cost reduction can be achieved.

(2) The structure is simple, the assembly work is easy to perform, and the workability can be improved.

(3) The structure is simple, the outer conductor of the cable can be reliably shielded, and the connection reliability can be improved.

1‧‧‧electrical connector

10‧‧‧Shell

11‧‧‧ flange

12‧‧‧ screw hole

13‧‧‧ positioning groove

14‧‧‧ Restricted protrusion

15‧‧‧Groove (groove for elastic fixture fixing)

16‧‧‧Guiding surface (Guiding surface for inserting elastic fixture)

17‧‧‧ Waterproof unit installation part

20‧‧‧Holding fastener

21‧‧‧Riveting Department

22‧‧‧The first contact piece

23‧‧‧ 2nd contact piece

24‧‧‧ Restricted

25‧‧‧Flexion

30‧‧‧ Elastic Fixture

31‧‧‧Abutment Department

40‧‧‧Waterproof unit

41‧‧‧Gasket

42‧‧‧washer

43‧‧‧Locking ring

44‧‧‧Waterproof ring

50‧‧‧cable

51‧‧‧core

52‧‧‧ Endothelium

53‧‧‧outer conductor

54‧‧‧ Outer skin

55‧‧‧ conductive tape

56‧‧‧Terminal

FIG. 1 is a perspective view showing an overall structure (a state after assembly) of an electrical connector according to an embodiment of the present invention.

FIG. 2 is an exploded side view showing the overall structure (the state before assembly) of the electrical connector according to the embodiment of the present invention.

FIG. 3 is a perspective view showing the shape of a holding fastener of an electrical connector according to an embodiment of the present invention. (A) shows a state before the outer conductor of the cable is riveted, and (b) shows a state after the outer conductor of the cable is riveted.

4 is a view showing a shape before assembly of a ring-shaped elastic fixture of an electrical connector according to an embodiment of the present invention, wherein (a) is a perspective view, (b) is a side view, and (c) is a plan view.

FIG. 5 is a view showing a state during installation of a ring-shaped elastic fixture in an electrical connector according to an embodiment of the present invention, (a) is a perspective view, and (b) is a cross-sectional view (a cable is not shown).

Fig. 6 is a view showing a state after the ring-shaped elastic fixture is installed in the electrical connector according to an embodiment of the present invention, (a) is a perspective view, and (b) is a sectional view (a cable is not shown).

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, in all the drawings for explaining the embodiment, the same reference numerals are given to the same components in principle, and repeated description is omitted.

FIG. 1 is a perspective view showing an overall structure (a state after assembly) of an electrical connector according to an embodiment of the present invention. FIG. 2 is an exploded side view showing the overall structure (the state before assembly) of the electrical connector according to the embodiment of the present invention.

First, the structure of an electrical connector according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. The electrical connector 1 according to this embodiment is an electrical connector for connecting cables used for, for example, high-voltage, high-current power lines to equipment (batteries, inverters, motors, etc. (not shown)). A slightly cylindrical metal case 10, a holding fastener 20 accommodated in the hollow inside the case 10, a ring-shaped elastic fixing device 30 installed in a groove inside the front (left side of Figs. 1 and 2) of the case 10, The waterproof unit 40 mounted on the outer side of the rear of the casing 10 (right side in FIGS. 1 and 2, cable extension direction), and a waterproof ring 44 made of rubber mounted on the outer periphery of the casing 10.

The cable 50 fixed to the electrical connector 1 is, for example, a shielded electric wire. The core 51 is covered with an inner conductor 52 that is insulated and covered by the core 51, a braided outer conductor 53 that covers the outside of the inner conductor 52, and the outer conductor 53 is insulated and covered. The sheath (sheath) 54 and the like. The structure of the cable 50 is to block electrical noise such as electromagnetic waves and static electricity. The outer conductor 53 covers the outer side of the core wire 51 which is covered with the inner surface 52 and is insulated. In one step, the outer side is insulated and covered by the outer sheath 54. The end portion of the cable 50 is formed by peeling the inner and outer sheaths 52 and 54 in stages to expose the core wire 51 and the outer conductor 53.

The exposed braided outer conductor 53 is folded back on the sheath 54, and a conductive tape 55 such as a copper material for preventing falling off is wound on the sheath 54, and then the fastener 20 is riveted and fixed. By using the conductive tape 55, the braided wires of the outer conductor 53 are bundled, and the holding fastener 20 bites into the conductive tape 55, making it difficult for the cable 50 to detach from the holding fastener 20. In the present embodiment, the conductive tape 55 is used for bundling the external conductor 53. However, instead of using the conductive tape, the external conductor 53 may be directly riveted and fixed by holding the fastener 20. The external conductor 53 is grounded to a device (for example, a device such as a battery or a motor) via a conductive tape 55, a holding fastener 20, and a case 10.

A metal terminal 56 is connected to the core wire 51, and the core wire 51 is connected to a power terminal or the like (not shown) of the device via the terminal 56. In addition, the terminal 56 illustrates a round terminal as an example, but it is not limited thereto, and any shape of the terminal may be used. The terminal 56 is not limited to a terminal connected to a power source of a device, and may be connected to a terminal such as a signal line.

The metal case 10 is formed of a metal such as aluminum or zinc, and is integrally formed by die-casting or the like. A flange 11 is formed integrally on a part of the outer periphery of the casing 10, and a screw hole 12 for mounting the casing 10 to a metal casing of the machine is perforated in the flange 11. The flange 11 is directly connected to the metal shell of the machine by making the screw hole 12, so that the shell 10 is grounded and connected to the metal shell of the machine. Also, the circle in the casing 10 A rubber ring (O-ring) 44 made of rubber for waterproofing is embedded in a groove on the outer periphery of the cylindrical portion in contact with the metal case.

The waterproof unit 40 includes a gasket 41 made of rubber, a washer 42 made of resin, and a locking ring 43 made of metal. A male thread is cut on the outer periphery of the waterproof unit mounting portion 17 of the casing 10, and a female thread is cut on the inner periphery of the lock ring 43. The lock ring 43 is rotated and locked to lock the washer 41 and the washer 42.入 于 壳 10。 In the casing 10. Thereby, the waterproofness of the electrical connector is maintained.

Next, an assembly process (harness processing) of the electrical connector 1 will be described with reference to FIG. 2. First, the waterproof ring 44 is attached to the case 10. Next, the cable 50 is passed through the locking ring 43, the washer 42, the gasket 41, and the casing 10. Next, the outer sheath 54 of the cable 50 is removed, and then the braided outer conductor 53 is folded back, and the conductive tape 55 is wound around the outer conductor 53 to bundle the outer conductor 53. Next, the inner surface 52 is removed, the core wire 51 is exposed, and the terminal 56 is crimped. Next, the holding fastener 20 is coated on the conductive tape 55, and then the holding fastener 20 is riveted, thereby crimping and fixing the external conductor 53. At this time, the holding fastener 20 is positioned at a predetermined distance from the terminal 56. Next, the holding fastener 20 to which the outer conductor 53 is crimped and fixed is inserted into the casing 10. At this time, the first contact piece 22 holding the fastener 20 is in contact with the inner wall of the casing 10. Next, the ring-shaped elastic fixture 30 is inserted into the groove in the casing 10, and the holding fastener 20 and the cable 50 are fixed in the casing 10. At this time, the second contact piece 23 holding the fastener 20 is in contact with the lower portion (abutment portion 31) of the elastic fixture 30. Next, at the waterproof unit mounting portion 17, the locking ring 43 is rotated and locked, thereby compressing the gasket 41 and the gasket Circle 42.

As described above, the electrical connector of this embodiment has a simple structure and a small number of parts, and is easy to assemble. Therefore, it is possible to improve the cost and workability.

Fig. 3 is a perspective view showing the shape of a holding fastener of an electrical connector according to an embodiment of the present invention. (A) shows a state before the outer conductor of the cable is riveted, and (a) shows a state after the outer conductor of the cable is riveted. . The holding fastener 20 is a fastener for riveting and fixing the outer conductor (braided wire) 53 of the cable 50. As shown in FIG. 3, the holding fastener 20 is formed by a riveting portion 21 at the front end portion, a tongue-shaped first contact piece 22 that is in contact with the inner wall of the housing 10, and is located on the opposite side of the first contact piece 22 and is connected to the elastic fixture 30 The tongue-shaped second contact piece 23 to be contacted, a tongue-shaped restriction piece 24 to restrict upward movement (to prevent floating), a buckling portion 25 bent during caulking, and the like are configured.

The structure is formed in such a manner that when the caulking is performed, the buckling portion 25 between the caulking portion 21 and the restricting piece 24 is bent. Thereby, it is not necessary to deform the holding fastener 20 with a curved surface, but to deform it in an angular manner, and the occurrence of rebound can be reduced. The holding fastener 20 is manufactured by punching a harder plate such as stainless steel. The holding fastener 20 is fixed in the casing 10 by the elastic pushing force of the elastic fixing tool 30. The holding fastener 20 is electrically connected to the casing 10 via the first contact piece 22 or the second contact piece 23.

4 is a view showing a shape before insertion of a ring-shaped elastic fixture of an electrical connector according to an embodiment of the present invention, wherein (a) is a perspective view, (b) is a side view, and (c) is a plan view. Figure 5 is an implementation of the present invention In the form of the electrical connector, a diagram showing a state in the middle of mounting the ring-shaped elastic fixture is shown (a) is a perspective view, and (b) is a cross-sectional view (a cable is not shown). Fig. 6 is a view showing a state after the ring-shaped elastic fixture is installed in the electrical connector according to an embodiment of the present invention, (a) is a perspective view, and (b) is a sectional view (a cable is not shown).

As shown in FIG. 4, the ring-shaped elastic fixture 30 has a curved shape before being attached to the casing 10. The elastic fixture 30 is a member that restricts movement in the cable axis direction of the holding fastener 20 by its elastic thrust when mounted. By inserting the curved elastic fixture 30 into the elastic fixture fixing groove 15 in the casing 10, the abutting portion 31 of the elastic fixture 30 abuts against the second contact piece 23 of the holding fastener 20, The contact piece 23 generates a spring thrust in a direction in which the cable is extended (for example, to the right of FIGS. 2, 6 (b), and 7 (b)).

The shape of the elastic fixture 30 is not limited to this, as long as the seat can be used by the spring thrust when mounting, for example, a spring such as a leaf spring, a disc spring, a coil spring, or the like. The cross-sectional shape of the elastic fixture 30 is not limited to a circular shape, and may be a rectangular, trapezoidal, or oval shape. Furthermore, in this embodiment, the shape of the elastic fixture 30 is bent and fitted into the linear groove of the housing 10 to generate a spring thrust. However, the elastic fixture 30 may be inserted into the housing 10 to the contrary. The groove is formed into a curved shape, so that the elastic thrust is generated.

As shown in FIG. 5, a positioning groove 13 for positioning the holding fastener 20 is formed inside the housing 10. When the holding fastener 20 is inserted, the first contact piece 22, the second contact piece 23, and the restriction piece 24 are along the positioning groove 13 When the first contact piece 22 moves, the first contact piece 22 comes into contact with the inner wall of the housing 10 and stops, whereby the holding fastener 20 is inserted into the regular position.

A limiting protrusion 14 is provided on the inner side of the housing 10, and the limiting piece 24 of the holding fastener 20 is engaged with the limiting protrusion 14, thereby restricting the holding fastener 20 from moving in a direction perpendicular to the cable extension direction (upward direction in FIG. 5).

As shown in FIG. 5 and FIG. 6, in front of the groove 15 for fixing the elastic fixture on the inner side of the casing 10, a protruding elastic fixture insertion guide surface 16 having a one-sided inclined surface (tapered surface) is provided. When the elastic fixture 30 is inserted into the groove 15, the elastic fixture 30 contracts and moves along the guide surface 16, and when it is inserted into the groove 15 beyond the mountain portion of the guide surface 16, it expands and is fixed. As shown in FIG. 5, the elastic fixture 30 has a curved shape before being fitted into the groove 15. After the elastic fixture 30 is inserted into the groove 15, as shown in FIG. 6, the abutting portion 31 of the elastic fixture 30 abuts against the second contact piece 23 of the holding fastener 20 so that the bending of the elastic fixture 30 is reduced ( Becomes nearly straight). Therefore, since the elastic fixture 30 is intended to return to the original curved shape, the force of the abutting portion 31 moving to the right in FIG. 6 (b) acts, so that the elastic pushing force is applied to the second contact piece holding the fastener 20. twenty three. Thereby, the clasp 20 and the cable 50 are surely fixed to the casing 10.

In addition, the first contact piece 22 of the holding fastener 20 surely contacts the inner wall of the casing 10, and the second contact piece 23 surely contacts the elastic fixture 30. Therefore, the holding fastener 20, the housing 10, and the elastic fixing are fixed The tool 30 allows the outer conductor 53 of the cable 50 to be reliably shielded.

In addition, as described above, the electrical connector 1 of the present embodiment has a simple structure and a small number of parts. Therefore, it is easy to perform an assembly operation, and it is possible to improve workability at a low cost.

The inventions developed and completed by the present inventors have been specifically explained based on the embodiments. However, the invention is not limited to the foregoing embodiments, and various changes can be made without departing from the technical idea. For example, in the foregoing embodiment, the elastic fixing force is generated by forming the elastic fixture 30 into a curved shape, but it is not limited to this. If the second contact piece 23 holding the fastener 20 can be extended toward the cable (rightward) If you push the pusher, it can be in other forms.

[Industrial availability]

The present invention is a variety of electrical connectors that can be used to ground the outer conductor of a cable to the metal shell of a machine.

Claims (6)

An electrical connector is characterized by having: a cylindrical metal casing; a holding fastener, the holding fastener is housed inside the casing, and is used for riveting and fixing an outer conductor of a cable; and a ring shape An elastic fixture, which is a groove installed on the inner side of the casing, and is used to restrict the movement of the holding fastener. The holding fastener has: a tongue-shaped first contact piece in contact with the casing; On the opposite side of the first contact piece, a tongue-shaped second contact piece that is in contact with the elastic fixture, and the holding fastener is fixed in the housing by the elastic pushing force of the elastic fixture. For example, the electrical connector according to the scope of patent application, wherein the elastic fixing device is configured to elastically push the second contact piece in the extending direction of the cable. For example, the electrical connector according to item 1 or 2 of the patent application scope, wherein the elastic fixture has a curved shape before being mounted on the housing. For example, the electrical connector according to the first or second aspect of the patent application, wherein the aforementioned holding fastener has a tongue-shaped restricting piece, the housing has a restricting protrusion on the inner side thereof, and the aforementioned restricting piece is engaged with the aforementioned restricting protrusion to restrict the aforementioned retaining buckle. The member moves in a direction perpendicular to the aforementioned cable extension direction. For example, the electrical connector of item 1 or 2 of the scope of patent application, wherein the outer conductor system of the cable is fixed to the holding fastener via a conductive tape. For example, the electrical connector according to item 1 or 2 of the patent application scope, wherein the holding fastener is electrically connected to the housing through the first contact piece or the second contact piece.