JPH048598Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention [Industrial Field of Application] The present invention relates to an improvement in the relay box mounting structure of a junction block used for electrical wiring in an automobile.

[Conventional technology and problems]

Conventionally, this type of mounting structure has been commonly shown in FIGS. 3 to 6. Reference numeral 1 indicates a junction block, and a bracket A is attached to the upper part of the junction block, which is fixed to the vehicle body, panel P, etc. via the neck 2.
A fitting tube 3 is provided for. Reference numeral 4 denotes a relay box, and a cylindrical mounting portion 5 that is inserted into the fitting tube 3 is provided on one side. As shown in FIG. 5, the mounting portion 5 has a bottom wall 5a with an open front end and a locking groove 5b that engages with a locking pawl 3a protruding from the back surface of the fitting tube 3. When fitting the relay 6 into the relay box 4, the operator holds the junction block 1 in one hand as shown in FIG. 6, and applies an insertion force F to the relay box 4.
Add. At this time, as shown in FIG. 4, a locking force G in the opposite direction to the insertion force F acts on the locking pawl 3a and the locking groove 5b, while on the mounting part 5 of the relay box 4, the locking force G acts on the locking claw 3a and the locking groove 5b. Due to the force F, a rotational torque F' is applied around the locking pawl 3a, and force is applied to the neck portion 2, which may cause damage to the neck portion 2. At this time, the relay 6 can be fitted if the strength conditions of each part satisfy the following: strength of the neck 2>retaining force of the relay box 4>insertion force F.

However, the neck 2 and relay box 4
It is extremely difficult to provide and manufacture a holding force such that the strength of the mounting portion 5 satisfies the above-mentioned conditions, and requires repeated trial and error and many experiments.

The purpose of this invention is to provide a structure that is easy to design and can be easily investigated without repeating the above-mentioned troublesome experiments, and which eliminates the risk of damage to the neck or mounting portion when the relay is mated. To provide a relay box mounting structure for a transmission block.

Structure of the Invention [Means for Solving Problems] The relay box mounting structure of the junction block of the present invention is as shown in FIGS. 1 and 2 a and b.
Ribs 7 are provided protrudingly along both side walls of the relay box 4, rib guide grooves 8 are provided on both side walls of the mounting portion 5 of the relay box 4, and a radius is formed at the corner of the rib 7. side wall 5c of section 5;
5c' and the side wall 8a of the rib guide groove 8, the length of the arm (depth of the groove) can be adjusted.

In FIG. 1, reference numeral 9 denotes a locking arm that engages with the locking hole _A1 of the bracket A (see FIG. 4).

[Effect]

In the present invention, if the rib guide groove 8 is aligned with the rib 7 of the fitting cylinder 3 of the electrical junction box 1 and the mounting part 5 of the relay box 4 is inserted, the locking pawl 3a and the locking groove 5b (see FIG. As before, both of them are locked by engagement with (see).

If the relay is fitted into the relay box 4 in the inserted and locked state of the fitting tube 3 and the mounting part 5 shown in FIGS. 2a and 2b, the locking pawl 3
The rotational torque F' with the rotation center at part a acts as before. At that time, since the front end of the attachment part 5 is open, the side wall part 5 of the arm length part
Rotational torque is concentrated at c and 5c'. As a result, as shown in FIGS. 2a and 2b, the side wall portion 5 is opened at the front end.
c and 5c' are bent to expand, and since the rib 7 is rounded, when a force exceeding a predetermined rotational torque is applied, the rib 7 and the rib guide groove 8 are disengaged, and the mounting portion 5 comes off from the fitting tube 3. That is,
The holding force of the relay box 4 against the fitting tube 3 can be adjusted by adjusting the arm length. Therefore,
If R is made small, the arm length will be shortened, the side wall portions 5c and 5c' will be less likely to bend, and the holding force will be increased.

In this way, by changing the radius of the rib 7, the holding force of the relay box can be adjusted, and an appropriate structural design and manufacture can be achieved in which the neck and the mounting part are not damaged when the relay is fitted. Effects of the invention As explained above, according to the invention, it is possible to select a mounting structure that does not cause damage to the neck of the junction block or the relay box when fitting the relay, and the design and manufacturing thereof are also facilitated. .

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of the main parts showing a preferred example of the relay box mounting structure of the junction block of the present invention, and Figs. 2a and 2b show the operating states of the fitting cylinder 3 and the mounting part 5, respectively. The assembly drawing, Figure 3 is a perspective view showing the conventional example, and Figure 4 is the - of Figure 3.
A partial sectional view along the line, FIG. 5 is the mounting part 5 of FIG. 4.
FIG. 6 is an enlarged explanatory diagram showing a conventional relay fitting method. A... Bracket, 1... Junction block, 2... Neck, 3... Fitting cylinder, 4... Relay box, 5... Mounting part, 6... Relay, 7...
Rib, 8...Rib guide groove,...Arm length.

Claims (1)

[Scope of utility model registration request] A fitting tube is provided on one side wall of the junction block to connect to a bracket provided on the vehicle body etc. through the neck portion, and a cylindrical shape is provided on one side wall of the relay box to be fitted over the fitting tube and the front end of the bottom wall is open. In the relay box mounting structure for a junction block, the structure includes a mounting section, in which ribs are provided protruding along both side walls of the fitting tube, rib guide grooves are provided on both side walls of the mounting section, and rib guide grooves are provided at the corners of the rib. Relay box mounting of a junction block, characterized in that an R is formed in the section, and the length of the arm formed between the side wall of the mounting section and the outer wall of the rib guide groove can be adjusted depending on the size of the R. structure.