JPH056881U - Wiring board fixing structure - Google Patents

Abstract

(57) [Summary] [Purpose] The wiring board to be housed in the case is securely fixed with a simple structure to prevent backlash. A pair of guides 4 are arranged to face each other on the inner surfaces of the side walls 3 of the case 1 which face each other, and a wiring board 6 is provided between the guides 4.
Can be inserted. On the front part of the guide 4 or the side wall 3 is provided an engaging projection 5 with which the wiring board 6 can be pressed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a wiring board fixing structure having a simple structure to securely fix a wiring board to be housed in a case and prevent the occurrence of backlash.

[0002]

[Prior Art]

 For example, when a printed circuit board is incorporated into the case of the control unit, a pair of guides are provided at opposite positions on the inner surface of the case, and the printed circuit board is inserted between the guides, as in Japanese Utility Model Laid-Open No. 52-119237. It was

[0003]

[Problems to be solved by the device]

 However, in this conventional structure, since the case is generally made of synthetic resin, the front side of the case is wider than the back part due to the spacing of the pair of guides due to the draft of the formwork. Variations in the thickness of the printed circuit board may cause play between the guide on the front side of the case and the printed circuit board, which may cause rattling noise due to vibration or a large impact on electronic parts on the board. There was a problem such as the action of.

An object of the present invention is to solve the above problems and to provide a wiring board fixing structure that securely fixes the wiring board inside the case with a simple structure and prevents the backlash from occurring. And

[0005]

[Means for Solving the Problems]

 For this reason, the wiring board fixing structure of the present invention is a wiring board fixing structure in which a pair of guides are arranged facing each other on the inner surfaces of the side walls of the case which face each other, and the wiring board can be inserted between these guides. It is characterized in that the guide or the side wall is provided with an engaging projection capable of press-contacting the wiring board to securely fix the wiring board inside the case with a simple structure and prevent the rattling. ing.

[0006]

【Example】

 Hereinafter, the illustrated embodiment in which the present invention is applied to a vehicle-mounted control unit incorporating a microcomputer will be described. In FIGS. 1 to 4, reference numeral 1 denotes a box-shaped case made of a synthetic resin that constitutes a casing of the control unit. A storage chamber 2 that opens to the side is provided inside, and a pair of guides 4 and 4 are provided on the inner surfaces of the side walls 3 and 3 of the chamber 2 that face each other.

On the front portions of the guides 4, 4, that is, on the inner surfaces of the storage chamber 2 that face each other on the opening side, engaging protrusions 5 having a rectangular cross section are provided in a rib shape over a predetermined length. A wiring board 6 such as a printed circuit board can be inserted between these engaging projections 5.

In this case, instead of forming the engaging projections 5 in a rectangular cross section, the engaging projections 5 are formed in a substantially semicircular cross section as shown in FIG. 3 or, instead of being rib-shaped, as shown in FIG. It is also possible to project in a substantially hemispherical shape at a predetermined position inside the front end of the.

5 to 7 show another embodiment of the present invention, and the same reference numerals are used for the components corresponding to those of the above-mentioned embodiment. In this embodiment, instead of providing the engaging projections 5 on the guides 4 and 4, notch portions 7 and 7 are provided at the positions facing the front portions of the side walls 3 and 3, and the upper and lower surfaces of the notch portions 7 and 7 are engaged with each other. It is characterized in that the projections 5 and 5 are provided so as to face each other, and the ear pieces 8 and 8 that are provided on both sides of the front portion of the wiring board 6 as shown in FIG. 7 can be inserted between them.

[0010]

[Action]

 In the wiring board fixing structure configured as described above, the engaging protrusions 5 and 5 are arranged opposite to each other at predetermined positions on the front side of the guides 4 and 4 protruding in the case 1, or the side walls 3 and 3 of the case 1 are arranged. Since the cutouts 7, 7 are provided in the front part of the and the engaging projections 5, 5 are provided at the respective facing positions of the cutouts 7, 7, the structure is simple, so that this can be easily manufactured.

Next, when the wiring board 6 is assembled to the case 1 thus manufactured, the wiring board 6 may be inserted between the guides 4 and 4 from the front side of the case 1. In this way, the tip of the wiring board 6 is inserted into the inner part between the guides 4 and 4, and the other end is lightly press-fitted between the engaging protrusions 5 and 5 protruding from the guides 4 and 4. It is pushed in in the state, and is strongly clamped and fixed by the elasticity of the engaging projections 5 and 5.

Therefore, the spacing on the front side of the guides 4, 4 becomes wider than the inner side due to the draft of the mold, and further, due to the variation in the thickness of the wiring board 6, the front side of the guides 4, 4 is Even under the situation where the backlash of the wiring board 6 is unavoidable, the backlash of the wiring board 6 is prevented by the above-mentioned clamping or pressing action of the engaging projections 5, 5. Therefore, the wiring board 6 does not make a rattling noise due to the traveling vibration of the vehicle, and the impact caused by the rattling does not adversely affect the electronic parts and the like on the wiring board 6.

Therefore, a connector is attached to one end of the wiring board 6, another wiring board 6 is arranged vertically, for example, in the vicinity of this connector, and the connector attached to the wiring board 6 is electrically connected to the connector. If the present invention is applied to this type of wiring board connecting method, the wiring boards 6, 6 are reliably and strongly prevented from rattling, and the reliability of the connection by the connector is significantly improved.

In the above-described embodiment, the engaging protrusions 5 are provided on both the pair of guides 4 or the side walls 3, but the engaging protrusions 5 may be provided on one of the pair of guides 4 or the side walls 3. Good.

[0015]

[Effect of the device]

 As described above, the wiring board fixing structure of the present invention is simple because a pair of guides protruding from the inner surfaces of the side walls of the case facing each other or the front portions of the side walls are provided with engaging projections capable of press-contacting the wiring board. With this configuration, the wiring board can be securely fixed inside the case, and it is possible to prevent rattling of the wiring board and rattling noise caused by vibrations, and also to electronic components on the wiring board that accompany rattling of the wiring board. There is an effect that the adverse effect of the impact of can be prevented.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a front view showing an enlarged main part of an application example of the present invention.

FIG. 4 is a cross-sectional view showing an enlarged main part of another application example of the present invention.

FIG. 5 is a front view showing another embodiment of the present invention.

FIG. 6 is a side view of FIG.

FIG. 7 is a plan view of a wiring board applied to the other embodiment.

[Explanation of symbols]

 1 Case 3 Sidewall 4 Guide 5 Engagement Protrusion 6 Wiring Board

Claims (1)

[Claims for utility model registration] [Claim 1] A wiring board fixing structure in which a pair of guides are arranged facing each other on the inner surfaces of the side walls of the case that face each other, and the wiring board can be inserted between these guides. A fixing structure for a wiring board, characterized in that an engaging protrusion capable of press-contacting the wiring board is provided on a front portion of a guide or a side wall.