JP2015070083A - Shield structure - Google Patents

Abstract

[PROBLEMS] To reduce the weight and the number of parts. A shield member 4 is provided that surrounds an electric wire routed between a first member (shield pipe 1) and a second member (connection cylinder portion 7 on the inverter 3 side) with a shield member 4. The shield member 4 has a shielding function by being formed of a rubber material containing a conductive material. The shield member 4 can be inserted with an electric wire and is formed in a cylindrical shape having flexibility. Both end portions of the shield member 4 are connected to the first member 1 and the second member 7 in a sealed state. [Selection] Figure 2

Description

  The present invention relates to a shield structure.

  Patent Document 1 below discloses a shield structure for an electric wire that connects a motor unit and an inverter unit in a hybrid vehicle. The motor unit and the inverter unit are connected by three high-voltage electric wires, and these electric wires are collectively covered with a braided wire knitted in a cylindrical shape. Both ends of the braided wire are fixed by being put on shield shells provided on the motor side and the inverter side, respectively, so that each electric wire is shielded by the braided wire.

JP 2013-115072 A

  However, in the case of the above structure, there is a problem of an increase in weight because the shield is taken by a braided wire that is knitted with a metal material. In addition, when waterproofness is required, for example, measures such as covering the braided wire with rubber grommets will be taken. Will increase.

  The present invention has been completed based on the above-described circumstances, and aims to provide a shield structure that can achieve waterproofing and can achieve weight reduction and reduction in the number of parts. To do.

  The shield structure of the present invention is a shield structure in which an electric wire routed between a first member and a second member is surrounded by a shield member, and the shield member is an electric wire made of a rubber material containing a conductive material. It is formed in a cylindrical shape that can be inserted through, and the whole has flexibility, and connection portions that can be connected to the first member and the second member in a sealed state are formed at both ends. Features.

  According to the present invention, since the shield member is formed of a conductive rubber material, a lightweight and inexpensive shield structure can be obtained. In addition, since the shield member also has a waterproof function, a dedicated member for waterproofing can be omitted to achieve a reduction in the number of parts. Furthermore, even if the arrangement conditions are such that the first member and the second member are not coaxial and are close to each other, the shield member has good flexibility, so that smooth wiring can be expected. The effect that it is possible is also acquired.

Schematic which shows the arrangement | positioning condition of the battery and inverter in the hybrid vehicle in Example 1. FIG. A perspective view showing a connection structure between the inverter side and the shield pipe side Sectional drawing which shows the connection condition between a shield pipe and a shield member (A) is an enlarged view of the main part of the seal part in Example 2, and is a cross-sectional view showing a state before fastening with a binding band, and (B) is a cross-sectional view showing a fastening state with a binding band.

A preferred embodiment of the present invention will be described.
(1) In the shield structure of the present invention, seal lips are formed along the circumferential direction on the inner peripheral surfaces of both connection portions, and both connection portions are provided on the outer peripheral surface of both connection portions as first and second members. It is also possible to provide a configuration in which a fastener for fastening and fixing is provided, and the seal lip is disposed at a position that is axially deviated from a portion where the fastener is provided.
Since the seal lip is arranged so as to be shifted in the axial direction from the portion where the fastener is provided, the situation where the seal lip is excessively crushed is alleviated, and good sealing performance can be ensured.

(2) Further, the seal lip is arranged on the end side from the portion where the fastener is provided, and the seal lip arranged at the opening end of the shield member projects more than the one arranged inside the seal lip. It is preferable that the height is high.
When the shield member is tightened against the first or second member by the fastener, the mouth is likely to open in a trumpet shape on the end portion side of the shield member. For this reason, the seal lip disposed particularly near the end portion is the first lip. There is a concern that the sealing force tends to be lower than other seal lip portions in a tendency to move away from the member or the second member. However, as in the above configuration, the sealing lip placed near the end has a protruding height higher than other sealing lips in advance, so that the sealing force is almost equal to that of other sealing lips even after tightening. Can be obtained, and can contribute to ensuring sealing performance.

Next, Embodiments 1 and 2 embodying the shield structure of the present invention will be described with reference to the drawings.
<Example 1>
FIG. 1 shows a connection state between a battery 2 mounted in a rear vehicle compartment and an inverter 3 mounted in an engine room in a hybrid vehicle. The battery 2 and the inverter 3 are connected by a wire harness WH composed of a plurality of electric wires.

  The wire harness WH is inserted through the shield pipe 1 except for a predetermined length range at both ends. A shield member 4 described later is connected to both ends of the shield pipe 1 (first member), and the wire harness WH is connected to the battery 2 (second member) side and the inverter 3 (second member) side through both shield members 4. Electrical connection is made.

  As shown in FIG. 1, the shield pipe 1 is arranged under the floor of the vehicle. The shield pipe 1 is made of metal (for example, made of an aluminum alloy) and is formed in a long pipe shape. In the middle, it is processed into a predetermined bent shape. As described above, the wire harness WH is inserted into the shield pipe 1. As shown in FIGS. 2 and 3, protective members 5 are attached to both ends of the shield pipe 1. Since the opening edge of the shield pipe 1 becomes a sharp edge along with the cutting, there is a risk of damaging the coating of the electric wire. For this reason, the protection member 5 is attached and the opening edge of the shield pipe 1 is covered to prevent the wire coating from being damaged.

  Specifically, the protection member 5 is made of a synthetic resin and has a cover portion 5 </ b> A for covering the end edge of the shield pipe 1. A pair of lock arms 5B are formed on the cover portion 5A so as to extend along the inner surface of the shield pipe 1 and can be bent. Lock claws 5C are formed at the ends of both lock arms 5B, and are elastically locked to locking holes 6 formed by opening one pair at both ends of the shield pipe 1 as the protective member 5 is attached. By doing so, the protective member 5 is mounted.

  FIG. 2 shows a shield structure between the shield pipe 1 and the metal connecting cylinder portion 7 (second member) attached to the body case on the inverter 3 side. The shield structure between them is basically the same structure.

  As shown in the figure, the connecting cylinder portion 7 is formed in a cylindrical shape having a substantially oval cross section that opens to the front surface side. A terminal (not shown) is provided inside the connecting tube portion. On the other hand, terminals (not shown) are also connected to the ends of the electric wires of the wire harness WH drawn out from the end of the shield pipe 1, and can be electrically connected to the corresponding terminals in the connection cylinder portion 7. .

  Next, the shield member 4 will be described. The shield member 4 is formed by mixing a conductive material (for example, conductive carbon black or conductive metal powder) with a rubber material as a main material. The shield member 4 is formed in a cylindrical shape having both ends opened. Connection portions 4A-1 and 4A-2 that can be connected to the shield pipe 1 and the connection cylinder portion 7 on the inverter 3 side are formed at both ends of the shield member 4. In the shield member 4, an accordion-shaped main body portion 4 </ b> B is formed between the connection portions 4 </ b> A- 1 and 4 </ b> A- 2, and imparts good flexibility to the shield pipe 1.

  As shown in FIG. 2, in the outer peripheral surfaces of both connection portions 4A-1 and 4A-2, the central portion in the length direction is lowered one step to form a groove portion 8. The groove portion 8 is formed to be depressed over the entire circumference, and a binding band 9 is attached thereto. Since the binding band 9 itself is a well-known thing, if it demonstrates easily, the binding band 9 will be integrally formed in the elongate band shape with the synthetic resin material. A lock portion 9A having a through hole is formed at one end of the binding band 9, and the other end of the binding band 9 can be passed through the lock portion 9A so that the whole can be formed into a loop shape. A number of locking claws (not shown) formed in a saw blade shape are formed on the other end side over a predetermined length range, and selectively with a deflectable lock piece provided in the lock portion 9A. By locking, the binding band 9 can have an arbitrary loop diameter, that is, a desired tightening force can be obtained. However, the binding band 9 can obtain a certain tightening force by using a dedicated tightening jig.

FIG. 3 shows an enlarged connection portion between the shield pipe 1 and the shield member 4.
A front seal portion 10 and a rear seal portion 11 are disposed on the inner peripheral surfaces of both connection portions 4A-1 and 4A-2 of the shield member 4 with a portion corresponding to the groove portion 8 sandwiched in the axial direction. Both the front and rear seal portions 10 and 11 are formed by two seal lips 12 shown in the figure. Each seal lip 12 is formed over the entire circumference and can be in close contact with the outer circumferential surface of the shield pipe 1.

  In addition, the taper surface 13 is formed in the front-end | tip of the outer peripheral surface of both connection part 4A-1, 4A-2. The tapered surface 13 serves to alleviate the fact that both connecting portions are swung up when high-pressure washing water is sprayed on the same portion.

  Next, the function and effect of the present embodiment configured as described above will be described. First, in the present embodiment, the shield pipe 1 and the inverter 3 or the battery 2 that have been connected by a conventional braided wire are replaced with a shield member 4 made of conductive rubber to connect them. . Since the shielding member 4 has good flexibility and good shielding properties like the braided wire, it can be easily routed in a narrow space like the braided wire and has a good shielding function. It can be demonstrated. On the other hand, since the shield member 4 is lightweight as a characteristic not found in the braided wire, it exhibits a characteristic function that contributes to weight reduction of the entire vehicle.

  In addition, since the shield member 4 also exhibits a sealing function as a characteristic that does not exist in the braided wire, it is not necessary to cover with a grommet for sealing unlike the case where the braided wire is used. Therefore, the number of parts can be reduced. Further, since the shield member 4 is provided with the seal portion with the binding band 9 sandwiched between the front and rear, each seal lip 12 is not directly subjected to the tightening force, and thus is not excessively crushed. Therefore, when a strong tightening force continues to act under the influence of heat, the seal lip 12 may stick to the outer peripheral surface of the shield pipe 1, but in this embodiment, such a situation occurs. Can be avoided, and a stable sealing property can be secured over a long period of time.

  Furthermore, in this embodiment, since the end portion of the shield pipe 1 is covered with the protective member 5, the wire coating is not damaged by the edge of the end portion of the shield pipe 1.

<Example 2>
4 (A) and 4 (B) show Example 2 of the present invention. In the second embodiment, the seal lip 12A formed at the opening end in the front seal portion 10 is formed with a protruding height higher than the other seal lips 12, as shown in FIG. That is, when both the connecting portions 4A-1 and 4A-2 are tightened by the binding band 9, the opening end portions of both the connecting portions 4A-1 and 4A-2 are expanded and deformed, but the seal lip 12A located at the opening end. Is formed with a protruding height capable of maintaining a tight contact state with the outer peripheral surface of the shield pipe 1 (see FIG. 4B).

In Example 2 formed in this way, it is possible to ensure the sealing performance at the open ends of the connection portions 4A-1 and 4A-2 that are open as the binding band 9 is tightened.
Other configurations are the same as those of the first embodiment, and the same operational effects can be exhibited.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) Although the shield pipe 1 is made of metal in the above embodiment, it may be made of synthetic resin. In that case, the shield pipe 1 can exhibit a shield function if a metal shield layer is buried concentrically in a synthetic resin main body.
(2) In the above embodiment, the shield structure of the present invention is applied between the shield pipe 1 and the inverter 3 or between the shield pipe 1 and the battery 2, but the application location should not be limited in any way. For example, the present invention can be applied to a shield structure between the inverter 3 and the motor.
(3) In the above embodiment, the resin binding band 9 is shown as a fastener, but a metal caulking ring (a part of the ring-shaped main body protrudes in a convex shape in the radial direction, and the protruding portion It is also possible to use a body whose inner diameter can be reduced by squeezing the base portion.
(4) The shield member 4 may be further passed through the corrugated tube, and the shield member 4 may be protected from damage by the tube.

1 ... Shield pipe (first member)
DESCRIPTION OF SYMBOLS 3 ... Inverter 4 ... Shield member 4A-1, 4A-2 ... Connection part 7 ... Connection cylinder part (2nd member)
9 ... Bundling band (fastener)
12, 12A ... Seal lip

Claims (3)

A shield structure that surrounds an electric wire routed between the first member and the second member with a shield member,
The shield member is formed into a cylindrical shape through which the electric wire can be inserted with a rubber material including a conductive material, and the entire shield member is flexible, and the first member and the second member are provided at both ends. A shield structure, characterized in that a connection portion is formed which can be connected in a sealed state. While a seal lip is formed along the circumferential direction on the inner peripheral surfaces of the two connection portions,
Fasteners are provided on the outer peripheral surfaces of the two connecting portions to fasten and fix the two connecting portions to the first and second members, and the seal lip is axially removed from the portion where the fasteners are provided. The shield structure according to claim 1, wherein the shield structure is disposed at a position.   The seal lip is disposed on the end side from the portion where the fastener is provided, and the seal lip disposed at the opening end of the shield member is more than the one disposed on the inner side. The shield structure according to claim 2, wherein the protruding height is high.

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