JP2004111418A - Fixing structure of power component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixing structure of a power component which can effectively utilize the space of a substrate. <P>SOLUTION: In the fixing structure of the power component 2 in which a surface of the component 2 mounted on the substrate 1 on the opposite side to the substrate 1 is fixed to be brought into close contact with a heat sink 3, upper protrusions 2b lower than the height of the component 2 are formed at both ends of the substrate 1 in the length direction, an engaging recesses 3b are formed on a surface of the protrusions 2b on the substrate 1 side, and lower protrusions 3a having an engaging recess 3b are formed on the opposite side to the substrate corresponding to the protrusions 2b of both upper sides of the component 2 even for the sinks 3. The protrusions 2b and 3a are engaged fixedly by a substantially C-shaped engaging member 5 having an elasticity. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fixing structure for a power component used in, for example, a motor control device.
[0002]
[Prior art]
Conventionally, in a motor control device or the like, fixing of power components has been performed as shown in FIGS. 2 (a) and 2 (b). That is, the power component 2 is connected and mounted on the substrate 1 by the circuit connection terminal 2a, the surface of the power component on the side opposite to the substrate is brought into close contact with the heat sink 3, and the screw 4 is inserted through the screw clearance hole 1a of the substrate 1. Thus, the power component 2 is fastened and fixed to the heat sink 3 (for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Utility Model Laid-Open Publication No. Hei 7-36467
[Problems to be solved by the invention]
However, such a conventional technique has the following problems.
That is, the fixing of the power component 2 to the substrate 1 is performed by screw tightening according to the specifications of the component manufacturer. Further, the circuit connection has a form in which the substrate 1 is mounted on the power component 2. In this embodiment, the screw hole of the power component 2 is hidden by the substrate 1, and thus the substrate 1 is provided with a screw relief hole 1 a for tightening the screw 4. Ensuring the space necessary for forming the screw relief hole 1a has been an obstacle to mounting electronic components on a substrate and forming circuit patterns on the substrate. In addition, torque management of the screws for screwing and fixing the power components is required, and the assembling work is troublesome.
The present invention has been made to solve such a problem, and an object of the present invention is to provide a power component fixing structure that can effectively utilize the space of a substrate.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problem, the present invention provides a fixing structure of a power component in which a surface of a power component mounted on a substrate on a side opposite to a substrate is closely fixed to a heat sink, at both ends of the power component in a length direction of the substrate, Forming an upper projection lower than the height of the power component, forming an engagement recess on the substrate-side surface of the upper projection, and also corresponding to both upper projections of the power component on the heat sink, A lower projection having an engagement recess is formed on the opposite side of the substrate, and the upper projection and the lower projection are engaged and fixed by an elastic substantially C-shaped engagement member. is there.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1A and 1B are views showing a fixing structure of a power component in an embodiment of the present invention, wherein FIG. 1A is a front view and FIG. 1B is a side view.
In the present invention, the mounting structure of the power component 2 on the substrate 1 is the same, but the configurations of the substrate 1, the power component 2, and the heat sink 3 are different.
The board 1 is not provided with a conventionally provided screw relief hole, and its space is effectively used for mounting electronic components on the board 1 and forming circuit patterns on the board 1.
The power component 2 has upper protruding portions 2b lower than the height of the power component 2 formed at both ends in the longitudinal direction of the substrate 1, and engaging recesses 2c formed on the surface of the upper protruding portion 2b on the substrate 1 side. Has formed.
The heat sink 3 has a lower protrusion 3a corresponding to both upper protrusions 2b of the power component 2, and an engaging recess formed on a surface of the lower protrusion 3a on the side opposite to the substrate 1. 3b.
In fixing the power component 2 to the heat sink 3, the positions of the upper protrusion 2b of the power component 2 and the lower protrusion 3a of the heat sink 3 are adjusted, and the engagement recess 2c of each upper protrusion 2b and the lower Both ends of a substantially C-shaped engaging member (for example, a spring) 5 having elasticity are engaged with and fixed to the engaging concave portion 3b of the side projecting portion 3a. Although 2d is a screw hole conventionally formed in the power component 2, it is not used in the present invention.
As described above, the power component 2 can be fixed to the heat sink 3 without using the screw 4, so that the space of the substrate 1 can be effectively utilized. As a result, it is possible to properly arrange the components mounted on the board and to form a circuit pattern route on the board, so that the board is downsized and the motor control device is downsized. In addition, the torque management of the screw, which is necessary when the power component is screwed and fixed, becomes unnecessary, and the assembling work becomes easy.
[0007]
【The invention's effect】
As described above, the present invention has the following effects.
(1) It is not necessary to tighten and fix the power components with screws, and the screw holes for the screws on the board are not required. Therefore, the space on the board can be effectively used, and the arrangement of the components mounted on the board and the optimization of the circuit pattern route on the board can be achieved.
(2) The board can be downsized, and the motor control device can be downsized.
(3) It is not necessary to control the torque of the screw for fixing the power component by screwing, and the assembling work is facilitated.
[Brief description of the drawings]
FIG. 1 is a diagram showing a fixing structure of a power component according to an embodiment of the present invention, wherein (a) is a front view and (b) is a side view.
FIGS. 2A and 2B are diagrams showing a fixing structure of a power component according to the related art, where FIG. 2A is a front view and FIG. 2B is a side view.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 board 1a screw relief hole 2 power component 2a circuit connection terminal 2b upper protrusion 2c engagement recess 2d screw hole 3 heat sink 3a lower protrusion 3b engagement recess 4 screw 5 engagement member

Claims (1)

In the power component fixing structure that closely adheres the surface of the power component mounted on the board on the opposite side to the heat sink,
At both ends in the length direction of the substrate of the power component, an upper projection lower than the height of the power component is formed, and an engagement recess is formed on the substrate side surface of the upper projection, and the heat sink is formed on the heat sink. Also, corresponding to both upper protrusions of the power component, a lower protrusion having an engagement concave portion on the opposite side of the substrate is formed, and each upper protrusion and lower protrusion are formed into a substantially C-shaped having elasticity. A fixing structure for a power component, wherein the power component is fixed by an engaging member.

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