JPH10290550A - Heat plate fixing unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance heat dissipation effect by providing a plurality of eave-like protrusions and resilient pawls on the body chassis fixed with a heat source member and securing the heat plate tightly to a heating member, thereby enhancing stability of adhesion between the heat plate and the heat source member and suppressing fluctuation. SOLUTION: A heat source member, i.e., a motor 2, is secured at first to a specified position of a body chassis 1 by means of screws 6. A heat plate 3 is then inserted in the direction of the body chassis 1 by sliding a recess 3a thereof between the body chassis 1 and an eave-like protrusion 4 provided on the vertical surface thereof. The recess 3a of the heat plate 3 is engaged with a resilient pawl 5 provided on the body chassis 1 and the resilient pawl 5 is deformed resiliently by a clamping force being generated between the recess 3a of the heat plate 3 and the eave-like protrusion 4. A repulsion force acts to press the end part of the recess 3a engaged with an inclining face 5c at the forward end of the resilient pawl 5 in the direction of the motor 2, thus sustaining the heat plate 3 and the body chassis 1 in tight contact state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat radiating plate fixing device for closely adhering to a heat generating member such as a motor for dissipating heat of the heat generating member by heat conduction.

[0002]

2. Description of the Related Art Conventionally, a method as shown in FIG. 6 is generally used for a fixing device of a radiating plate which is brought into close contact with a member of a heat generating source such as a motor and which dissipates the heat by heat conduction. Are known.

FIGS. 6 (a) and 6 (b) are views showing a conventional heat sink fixing device before and after assembly. For the sake of explanation, a motor 102, a heat sink 103, and a heat sink 10 which are heat source members are described.
3 shows only a part of the main body chassis 101 fixing the motor 102 and the heat radiating plate 103 and the fastening screw 107 for fixing the device 3 in close contact with the main body chassis 101, and the device main body equipped with the heat radiating plate fixing device. And other parts constituting the device main body are omitted.

In FIG. 6, reference numeral 102a denotes a motor 10
A flange for attaching 2 to the main body chassis 101;
Reference numeral 106 denotes a fastening screw for fixing the motor 102 to the main body chassis 101, and reference numeral 103a denotes a radiator plate 103 for fixing a radiator plate.
A screw hole 101a is provided in the main body chassis 101 for fixing the heat sink 103.

In the above configuration, the heat radiating plate and the motor serving as the heat source member are pressed against each other by screws or the like through long holes provided in the heat radiating plate, and are fixed to the main body chassis so as to maintain the close contact state. Things.

[0006]

However, in the heat sink fixing device of the above-mentioned conventional construction, a fastening member is required to fix the heat sink, so that the number of components increases, and the heat sink is closely attached to the heat source member. There is a problem that it takes a lot of man-hours to attach the heat radiating plate because it is fixed, and it is difficult to obtain stability in the degree of adhesion between the heat radiating plate and the heat source member, so that the heat radiating effect tends to vary.

The present invention solves the above-mentioned conventional problems, reduces the number of components, facilitates the mounting of the heat sink, and enhances the adhesion stability between the heat sink and the heat source member, thereby reducing the heat radiation effect. It is an object of the present invention to provide a radiating plate fixing device having a certain characteristic.

[0008]

In order to solve this problem, a heat sink fixing device according to the present invention comprises a plurality of eaves-like projections which slidably hold a heat sink on a main body chassis to which a heat source member is fixed. And a resilient claw that generates a repulsive force due to elastic deformation in response to pressing of the radiator plate after being sandwiched, and has a configuration in which the radiator plate is brought into close contact with the heat source member to be locked and fixed.

According to the present invention, there is provided a radiating plate fixing device which can reduce the number of parts, facilitate mounting of the radiating plate, improve the adhesion stability between the radiating plate and the heat source member, and have a radiating effect with less variation. can get.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is characterized in that a plurality of eaves-like projections for slidably holding a heat radiating plate are provided on a main body chassis to which a heat generating member is fixed, and the radiating heat after being held is provided. An elastic claw that generates a repulsive force due to elastic deformation with respect to the pressing of the plate is provided, and the heat sink is pressed and adhered to the heat source member so as to be locked and fixed. The heat radiation effect described above can be obtained, and the heat radiation plate can be attached very easily.

According to a second aspect of the present invention, at least two or more elastic claws are provided on the main body chassis, the resilient force of the elastic deformation acting to press the radiator plate against the heat source member. In the pressure contact direction with the heat source member, it has a configuration provided slightly shifted, even if there is a variation in the mounting position and external dimensions of the heat sink or the heat source member, the elastic claw is always. Since the radiator plate can be brought into close contact with the heat source member by engagement, the number of components is small, a stable radiating effect is obtained, and the mounting of the radiator plate is extremely easy.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. (Embodiment 1) FIG. 1 is a perspective view showing a structure before and after mounting of a heat sink fixing device according to a first embodiment of the present invention, and FIGS. 1 (a), 1 (b) and 1 (c) show respective structures. Shown before installation, immediately after insertion of the heat sink, and after installation.

In FIG. 1, 1 is a main body chassis, 2 is a motor as a heat source member, 2a is a flange for attaching the motor to the main body chassis, 3 is a heat radiating plate, 3a is a concave portion provided on the heat radiating plate 3, 4 Is a plurality of eave-like projections provided integrally with the main body chassis to slidably hold the heat sink, 5 is an elastic claw provided integrally with the main body chassis to lock and fix the heat sink, 6 is a motor 2 attached to the main body chassis 1 It is a fastening screw for fixing.

The operation of the embodiment will be described below with reference to FIG. First, the motor 2 as a heat source member is fixed to a predetermined position of the main body chassis 1 with screws 6.

Next, the heat radiating plate 3 is slid between the eaves-like projections 4 provided on the vertical surface of the main body chassis 1 to which the motor 2 is fixed and the surface of the main body chassis 1 so as to slide the concave portion 3a of the heat radiating plate 3. When inserted in the direction of the main body chassis 1 to which the main body 2 is fixed, the concave portions 3 a of the heat sink 3 engage with the elastic claws 5 provided on the main body chassis 1.

At this time, the elastic claw 5 is elastically deformed by the pinching force generated between the concave portion 3a surface of the heat sink 3 and the eave-shaped projection 4, and
The repulsive force acts to press the end of the concave portion 3a with which the inclined surface 5c provided at the distal end portion of the elastic claw 5 is engaged in the direction of the motor 2 so that the heat radiating plate 3 is in contact with the main body chassis 1 and the concave surface 3a. To maintain the state of being pressed against the outer surface of the motor 2 while keeping the contact state.

Further details of the fixing of the heat sink 3 by the elastic claws 5 will be described with reference to FIG. FIG. 2 is a cross-sectional view showing the configuration of the heat sink fixing device according to the embodiment before and after mounting the heat sink. FIGS. 2 (a), (b), and (c) show the structure before and after the heat sink is inserted, respectively. Shows after installation.

The elastic claws 5 in the state shown in FIG. 2A protrude from the surface of the main body chassis 1 surrounded by the eaves-like projections 4 without deformation.

The elastic claw 5 in the state shown in FIG. 2B is suppressed to the opposite side of the eaves-like projection 4 by the pinching force generated between the inserted concave surface 3a of the heat sink 3 and the eaves-like projection 4. It is elastically deformed.

The elastic claw 5 in the state shown in FIG.
And engages with the end of the concave portion 3a provided in the heat sink 3, and acts to press the end of the concave portion 3a toward the motor 2 by the repulsive force of the elastic deformation of the elastic claw 5 itself. Reference numeral 3 is fixed to the outer surface of the motor 2 by being pressed against the outer surface of the motor 2 in a state of being in close contact with the main body chassis 1 at the surface of the concave portion 3a.

As described above, according to the first embodiment, the heat sink can be easily locked and fixed simply by inserting the heat sink into the main body chassis, so that the number of parts can be reduced and the cost can be reduced. Since the state in which the body chassis, the heat radiating plate and the heat source member are always in close contact is maintained, the advantageous effect that the heat radiating effect is high and stable is obtained.

(Embodiment 2) FIG. 3 is a perspective view showing a structure before and after assembly of a heat sink fixing device according to a second embodiment of the present invention, and FIGS. 3 (a), (b) and (c). ) Indicates before mounting, immediately after inserting the heat sink, and after mounting, respectively. 1 and 2 are omitted, but reference numerals 5a and 5b are used to lock and fix the radiator plate provided integrally with the main body chassis 11 while being slightly shifted in the direction of pressure contact between the radiator plate 3 and the heat source member 2. The elastic claw 5a has a length at a position where the locking and fixing position with the heat sink 3 is normal, and the elastic claw 5b has a length with the locking and fixing position with the heat sink 3 shifted in a direction away from the motor 2. That's it.

Hereinafter, details of the fixing of the heat sink 3 by the elastic claws 5a and 5b will be described with reference to FIGS.

FIGS. 4 (a) and 4 (b) are cross-sectional views showing the radiator plate fixing device of the embodiment before and immediately after the radiator plate is mounted, respectively, and FIGS. 5 (a) and 5 (b) are the same. It is sectional drawing which shows the locked and fixed two different states after attachment of the heat sink of the heat sink fixing device in embodiment. FIG. 5A shows a case where the locking and fixing position of the heat sink 3 is in a normal state.
(B) is a case where the locking and fixing position of the heat sink 3 is shifted in a direction away from the motor 2. That is, FIG.
Represents a press-contact locked state when the fixing position of the heat sink 3 is shifted in a direction away from the motor 2 due to a variation in the outer dimensions of the motor 2 or a variation in the mounting position.

The elastic claws 5a and 5b in the state shown in FIG.
Main body chassis 11 surrounded by eaves-like projections 4 without being deformed
Surface protrudes toward the eaves-shaped projection 4 side.

The elastic claws 5a and 5b in the state shown in FIG.
Due to the pinching force generated between the concave portion 3a surface of the inserted heat sink 3 and the eaves-shaped protrusion 4, it is suppressed to the opposite side of the eaves-shaped protrusion 4,
It is elastically deformed.

The elastic claw 5a in the state shown in FIG.
3c, the elastic claw 5 is engaged with the end of the concave portion 3a, and the elastic claw 5 itself resiliently deforms so as to press the end of the concave portion 3a in the direction of the motor 2 so as to radiate heat. The plate 3 is kept in close contact with the main body chassis 11 on the surface of the concave portion 3a,
Is pressed into contact with the outer surface and is fixed. In this case, the elastic claws 5b are in contact with the concave portions 3a of the heat sink 3.

The elastic claw 5a in the state shown in FIG. 5B cannot engage with the concave portion 3a of the heat sink 3 and remains elastically deformed.
The elastic claw 5b has a concave portion 3a provided on the heat sink 3 with a slope 5c.
And the resilient force of the elastic claw 5b itself presses the end of the recess 3a in the direction of the motor 2, so that the heat radiating plate 3 is in contact with the body chassis 11 and the recess 3a. The motor 2 is pressed against the outer surface of the motor 2 while being kept in close contact with the motor 2, and is locked and fixed.

As described above, according to the second embodiment, even when the fixing position of the heat radiating plate deviates from the normal position due to a variation in the outer dimensions of the heat source member, a variation in the mounting position, or the like, a plurality of elastic claws can be used. Either can be engaged with the end of the concave part of the heat sink, and it can be locked and fixed by pressing, and since the heat sink can be locked and fixed just by inserting the heat sink into the main body chassis, the number of parts is small and heat radiation The effect of easy and inexpensive mounting of the plate, and the state where the heat sink and the body chassis and the heat sink and the heat source member are always in close contact are maintained, so the heat dissipation effect is high and stable. The advantageous effect described above can be obtained.

In this embodiment, the method of absorbing the variation in the outer dimensions of the heat source member and the variation in the mounting position is such that the fixing position of the heat sink is fixed away from the heat source member. A similar effect can be obtained when approaching 2.

Further, by providing three elastic claws in advance at relative positions corresponding to the central value and the upper and lower limit values of the external dimension variation value and the mounting position variation value of the heat source member,
Most of the heat source members can absorb the variation, and the same effect can be obtained.

In the present embodiment, the configuration is such that the number of the elastic claws is two. However, by increasing the number to three or more, the possible range of the fixing and fixing of the radiator plate is widened, and the variation of the outer dimensions of the heat source member is reduced. It is clear that the effect of increasing the absorption range such as variation in mounting dimensions is added to the above-mentioned effect.

Further, the slope 5c of the elastic claw with which the heat sink is engaged.
If the angle is set at an angle, the number of elastic claws increases in synergy with the external dimensions of the heat source member, the mounting position, etc. The effect that the locking and fixing force can be increased can be obtained.

[0034]

As described above, the apparatus for fixing and mounting a heat sink according to the present invention has a plurality of eaves-like projections for slidably holding the heat sink on the main body chassis to which the heat source member is fixed. An elastic claw that generates a repulsive force due to elastic deformation in response to pressing of the heat radiating plate is provided, and the heat radiating plate is configured to be brought into pressure contact with the heat source member and locked and fixed. By simply inserting it into the part, it can be easily locked and fixed, the number of parts is small and it can be inexpensive, and the state that the heat sink and the body heat sink and the heat sink and the heat source member are always in close contact is maintained. , High heat dissipation effect,
And the advantageous effect of being stable is obtained.

[Brief description of the drawings]

FIG. 1A is an exploded perspective view showing a configuration of a heat sink fixing device according to a first embodiment of the present invention. FIG. 1B is a perspective view showing a state before mounting the heat sink in the embodiment. The perspective view which shows the state after the attachment of the heat sink in the embodiment.

FIG. 2A is a cross-sectional view showing a state before mounting the radiator plate in the embodiment; FIG. 2B is a cross-sectional view showing a state in the middle of mounting the radiator plate in the embodiment; Sectional view showing the state after mounting the heat sink

FIG. 3A is an exploded perspective view showing a configuration of a heat sink fixing device according to a second embodiment of the present invention. FIG. 3B is a perspective view showing a state before mounting the heat sink in the embodiment. The perspective view which shows the state after the attachment of the heat sink in the embodiment.

FIG. 4A is a cross-sectional view showing a state before mounting a heat sink according to the embodiment; FIG. 4B is a cross-sectional view showing a state during mounting of the heat sink according to the embodiment;

FIG. 5A is a cross-sectional view showing a locked state after mounting a heat sink in the embodiment. FIG. 5B is a cross-sectional view showing another locked state after mounting a heat sink in the embodiment.

FIG. 6A is an exploded perspective view showing a configuration of a conventional heat sink fixing device. FIG. 6B is a perspective view showing an attached state of a heat sink in the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body chassis 2 Heat source member (motor) 2a Flange 3 Heat sink 3a Depression 4 Eave-shaped projection 5, 5a, 5b Elastic claw 6 Heat source member (motor) mounting screw 11 Body chassis

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor: Kenji Toyoda 1006 Kazuma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. A plurality of eaves-like projections for slidably holding a heat radiating plate and a repulsive force due to elastic deformation with respect to the pressing of the heat radiating plate after the holding, on a main body chassis to which a heat source member is fixed. A heat radiating plate fixing device having an elastic claw, wherein the heat radiating plate is pressed and adhered to the heat source member to be locked and fixed. 2. The main body chassis is provided with at least two or more elastic claws which act to press the heat radiating plate against the heat source member by a repulsive force due to elastic deformation, in a pressure contact direction between the heat radiating plate and the heat source member, 2. The heat sink fixing device according to claim 1, wherein the heat sink fixing device has a configuration provided slightly shifted.