JPH05168124A - Fixing structure for electric joint box and relay unit - Google Patents

Abstract

PURPOSE:To provide a fixing structure for an electric joint box and a relay unit for optional circuit wherein the number of components such as wires and connectors and the manpower for jointing work can be reduced. CONSTITUTION:An electric joint box A comprises cases 1, 1' for containing circuit boards, connectors 2A, 2B... for connecting electric components and wire harness to the outer faces of the cases 1, 1', and a spare connector 10 for distributing power supply. A bus bar having a terminal connecting part to be connected with a connector terminal 12 of the spare connector 10 at one end and a power supply terminal connecting part to be connected with the power supply terminal of a relay 4 at the other end is interposed between a JB coupling connector B2 and a relay mounting part B1 of a relay unit B. Lock means 13, 21 are further interposed between the spare connector 10 and the JB coupling connector B2 so that electrical and mechanical coupling are established simultaneously between the electric joint box A and the relay unit B upon locking of the connectors B2 and 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for an electric connection box used for interconnection of wire harnesses and a relay unit equipped with a relay for an optional circuit.

[0002]

2. Description of the Related Art Generally, an electric junction box has a circuit board (not shown) such as a printed wiring board and a bus bar wiring board housed in upper and lower cases 1 and 1 ', as shown in FIG. Fuse connector 2A and relay connector 2 on the outer surface of 1
B, various connectors such as a wire harness connecting connector 2C are provided, and connector terminals that are electrically connected to the circuit conductors of the circuit board are projected into these connectors to fit and connect with the fuse 3, the relay 4, and the connector 5 of the harness terminal. It has a configuration designed to do so.

On the outer surface of the upper case 1, a spare connector 2X is provided and an engaging portion 6 is provided on the side surface 1a of the upper case 1 in order to prepare for addition of an optional circuit or partial change of an internal circuit. .. Then, for example, when newly forming and connecting an optional circuit including a relay, the fitting member 6'of the cassette type relay unit 7 having the relay 4'connected to the upper surface is engaged and fixed to the locking portion 6. At the same time, the connector 5'at the end of the electric wire 8 led out from the lower surface of the unit 7 is connected to the spare connector 2X to take out the power source. Reference numeral 8'denotes an electric wire for output of the relay 4 '.

FIG. 7 shows a wiring diagram of the connecting portion between the cassette type relay unit 7 and the electric connection box J. The solid line shows the bus bar 9 as a circuit conductor inside the electric connection box and the broken lines show the electric wires 8, 8 '. ing.

[0005]

In the conventional mounting and connecting structure of the relay unit 7, the branch harness w ₁ which is composed of the electric wire 8 and the connector 5'in addition to the unit 7 for connection with the electric junction box J is used. In addition to this, the branch harness w ₁ has to be turned around from the lower surface of the electric junction box J to the upper surface side to be connected, which is troublesome to work and has a poor appearance.

The present invention has been made in view of the above-mentioned problems, and when an optional circuit including a relay is added to an electric connection box, electric wires, connectors, etc. are not changed without changing the circuit configuration inside the box. (EN) Provided is a mounting structure for an electrical junction box and a relay unit, which can reduce the number of parts and the number of steps for these connecting operations.

[0007]

In order to achieve the above-mentioned object, the mounting structure for an electric junction box and a relay unit according to the present invention has a structure in which a circuit board is housed in a case, A variety of connectors for connecting electrical parts such as fuses and relays and a wire harness are provided on the outer surface of the connector and a spare connector for power distribution is provided, and each connector accommodates a connector terminal that is electrically connected to the circuit board. And an electrical connection box (JB), and a relay unit integrally formed with a JB coupling connector fitted to the spare connector and a relay mounting portion for connecting and mounting an optional relay. Between the connector and the relay mounting portion, a terminal connecting portion that is connected to the connector terminal of the spare connector is provided at one end, and a power supply terminal that is connected to the power supply terminal of the relay at the other end. A bus bar provided with a connecting portion is provided, and locking means is provided between the spare connector and the JB coupling connector so that the electrical connection box and the relay unit are electrically and mechanically coupled when both connectors are fitted and locked. The feature is that the structure is performed at the same time.

[0008]

When the JB coupling connector of the relay unit is fitted to the spare connector of the electrical junction box, the two are electrically and mechanically coupled with one touch. The relay unit incorporates a circuit portion necessary for forming an optional circuit including a relay by a bus bar, and a power supply terminal connecting portion derived from the bus bar constitutes a JB coupling connector. Therefore, there is no need to change the circuit configuration inside the electrical junction box, and the conventional branch harness is not required for connecting the relay unit to the electrical junction box, which reduces the number of parts and the number of connection work steps, and reduces costs. Can be planned.

[0009]

FIG. 1 is a perspective view of an electric junction box A and a relay unit B in a separated state. It should be noted that the same components as those of the conventional one in the electrical junction box A are denoted by the same reference numerals as in FIG.

On the upper surface of the upper case 1 of the electrical junction box A, a spare connector 10 is provided along the side surface 1a and two guide projections 11 are provided on the side surface 1a. An internal bus bar wiring board (not shown) is provided in the spare connector 10.
The two connector terminals 12 standing upright from the
It is formed as a two-pole connector which is connected to the power supply and the ground respectively. One of the surrounding walls of the spare connector 10 in the longitudinal direction (on the side surface 1a side) is opened to form a three-way enclosure, and the other side wall is provided with a lock receiver 13.

The relay unit B is an optional relay.
Relay mounting part B for connecting and mounting 4 ' ₁And JB connection
Kuta B₂And is a bridge B₃Is formed integrally through
It 2 is an exploded perspective view of the relay unit B, and FIG.
Bottom view, Fig. 4 shows connection between relay unit B and electrical junction box A
The partial sectional view of a part is shown. As shown in these figures, the relay
-The insulating case 14 that forms the outer shell of the unit B is a relay
The mounting portion 14A, the connector portion 14B and the both are connected.
And a cross-linked portion 14C.

The relay mounting portion 14A has two kinds of large and small terminal accommodating chambers 15 ₁ to 15 ₅ and 16 which are opened vertically, and the terminal 4a of the relay 4'is inserted from the upper end opening side. Also, the terminals 17 and 18 at the ends of the electric wire 8'are inserted from the lower end opening side (see FIG. 3). Further, a hook 19 for locking an electric wire is provided upright on the upper end opening side of the relay mounting portion 14A, and leg plates 20, 20 circumscribing the guide projection 11 are vertically provided on both sides on the lower end opening side.

The connector portion 14B has a flexible lock arm 21 which engages with the lock receiver 13 on the outer side, and a pair of terminal accommodating chambers 22 whose upper ends are closed inside, and which has a two-pole JB coupling. Is formed as a connector B ₂ . That is,
As shown in FIGS. 3 and 4, a bus bar accommodating groove 24 is provided between the terminal accommodating chamber 22 of the connector portion 14B and the terminal accommodating chamber 15 ₁ (15 ₂ ) of the relay mounting portion 14A.
Alternate locking pawls 25 are preferably provided on the four opposing groove walls.
Is provided to prevent the inserted bus bar 26 from falling off. The bus bar 26 is provided with an upward tab 27 at one end and a downward tab 27 'at the other end, and female-female relay terminals 28 are fitted and inserted into the bus bar 26 so that one of them is connected to the (power) terminal 4a of the relay 4'. To the connector terminal 12 of the spare connector 10. Reference numeral 30 denotes a connector cover that covers the connector portion 14B.

In the above structure, when the JB coupling connector B ₂ of the relay unit B equipped with the relay 4'is inserted into the spare connector 10 of the electrical junction box A, the relay mounting portion B
_Since the leg plates 20 and 20 of ₁ are also guided by the guide ridges 11 and 11, both connectors B ₂ and 10 are smoothly fitted and locked by the engagement of the flexible lock arm 21 and the lock receiver 13. Further, the relay unit B is stable against external force because the leg plate 20 circumscribing the guide ridge 11 restricts its movement to the left and right.

Further, the fitting lock between the JB coupling connector B ₂ and the spare connector 10 allows the relay 4 '(power source) to operate.
The terminal 4a is connected to the connector via the bus bar 26 (connector terminal 12, terminal connecting portion 29 ', power supply terminal connecting portion 29).
Therefore, as is clear from the comparison of the wiring diagrams shown in FIGS. 5 and 7, the branch harness w ₁ for connecting the power source of the relay 4'is unnecessary, and the number of parts can be reduced and the number of wires can be reduced. ..

By locking the electric wire 8'group connected to the relay unit B to the hook 19, it is possible to prevent the terminal from coming off.

[0017]

As described above, according to the present invention,
When connecting an optional circuit including a relay to the electrical connection box, there is no need to change the circuit configuration inside the box at all, reducing the number of parts such as electric wires and connectors and the number of connection work steps. Can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention with an electric junction box and a relay unit separated.

FIG. 2 is an exploded perspective view of the above relay unit.

FIG. 3 is a bottom view of the relay unit of the above.

FIG. 4 is a partial cross-sectional view of a connection portion between the relay unit and the electric junction box of FIG.

5 is a wiring diagram of the connection portion of FIG.

FIG. 6 is a perspective view showing a mounting structure of a conventional electric junction box and a cassette type relay unit in a separated state.

FIG. 7 is a wiring diagram of a connection portion between the electrical junction box and the cassette type relay unit of FIG.

[Explanation of symbols]

A Electric connection box B Relay unit B ₁ Relay mounting part B ₂ JB coupling connector 1 Upper case 1'Lower case 2A, 2B ... Connector 3 Fuse 4 Relay 5 Connector 8,8 'Electric wire 9 Busbar 10 Spare connector 12 Connector terminal 13 Lock receiving 15 ₁ , 15 ₂ ... Terminal accommodating chamber 16 Terminal accommodating chamber 17, 18 Terminal 21 Flexible lock arm 22 Terminal accommodating chamber 26 Busbar 29 Power terminal connecting part 29 'Terminal connecting part

Claims (1)

[Claims] 1. A circuit board is housed in a case, various connectors for connecting electrical parts such as fuses and relays and a wire harness are provided on the outer surface of the case, and a spare connector for power supply is provided. The connector integrally includes an electric connection box (JB) that accommodates a connector terminal that is electrically connected to the circuit board, and a JB coupling connector that is fitted to the spare connector and a relay mounting portion that connects and mounts an option relay. A relay unit formed in the above, and a terminal connecting portion connected to the connector terminal of the spare connector is provided at one end between the JB coupling connector and the relay mounting portion, and the other end is connected to the power terminal of the relay. A bus bar provided with a power supply terminal connecting portion to be connected is provided, and a locking means is provided between the spare connector and the JB coupling connector to connect both connectors. A mounting structure for an electric connection box and a relay unit, characterized in that the electric connection box and the relay unit are electrically and mechanically coupled at the same time when the fitting is locked.