CN209738926U

CN209738926U - Frame structure for vehicle

Info

Publication number: CN209738926U
Application number: CN201920146592.6U
Authority: CN
Inventors: 渡边晃; 池田利正
Original assignee: Koito Manufacturing Co Ltd
Current assignee: Koito Manufacturing Co Ltd
Priority date: 2018-02-07
Filing date: 2019-01-28
Publication date: 2019-12-06
Anticipated expiration: 2029-01-28
Also published as: JP2019139875A; CN110116669A

Abstract

The utility model provides a can ensure on the basis that realizes that manufacturing cost reduces that the cover is in stable framework structure for vehicle of engaged state for the casing. The vehicle frame structure includes: a case having a welding surface and formed of a predetermined synthetic resin; a cover joined to the housing by welding; the cover is provided with an external surface portion whose outer surface faces the vehicle outer side, and a joint portion which has a joint surface in contact with a weld surface and is joined to the case, and a portion of the joint portion including at least the joint surface is formed of synthetic resin of the same type as the case. Therefore, it is difficult to generate residual stress at the joint portion of the cover and the case, and it is possible to reduce the time and temperature of the annealing treatment or to eliminate the need for the annealing treatment in the work of joining the cover to the case, and to ensure a stable joined state of the cover to the case while reducing the manufacturing cost.

Description

Frame structure for vehicle

Technical Field

The utility model relates to a make the cover joint at the technical field of the vehicle frame structure of casing through the welding.

Background

In a housing structure provided in a vehicle, for example, a housing structure of a vehicle lamp or the like, there is a structure in which a cover is welded to a housing by various methods such as laser welding, hot plate welding, or vibration welding (for example, see patent document 1).

In the case structure for a vehicle in which such a cover is welded to a housing, it is necessary to ensure a stable welded state of the welded cover with respect to the housing, but since the resin forming the cover and the resin forming the housing have different physical properties, there is a possibility that stress remains in the joint portion between the two due to the difference in melting speed and solidification speed between the two at the time of welding.

For example, the cover is often formed of an acrylic resin from the viewpoint of ensuring high strength and transparency, and the housing is often formed of an ABS resin (acrylonitrile-butadiene-styrene copolymer synthetic resin) or an AAS resin (acrylonitrile-acrylate-styrene copolymer synthetic resin) from the viewpoint of ensuring high moldability and impact resistance.

Here, in the vehicle frame structure in which the cover is joined to the case by welding, in order to secure a stable joining state of the cover to the case, so-called annealing treatment (annealing step) is performed in which the joined cover and case are heated in an annealing furnace at a constant temperature for a constant time. By the annealing treatment, stress at the joint portion of the cover and the case is relaxed, and a stable joint state of the cover with respect to the case is ensured.

Patent document 1: japanese unexamined patent publication No. 2017-189887

However, the annealing process described above is one of the reasons why the cost for manufacturing the vehicle frame structure increases because the time for manufacturing the vehicle frame structure increases and facilities such as an annealing furnace are required.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved by the utility model

the present invention is directed to a vehicle frame structure that ensures a stable joining state of a cover to a housing while reducing manufacturing costs.

means for solving the problems

In a first aspect, the present invention provides a frame structure casing for a vehicle, including: a case having a welding surface and formed of a predetermined synthetic resin; a cover joined to the housing by welding; the cover is provided with an exterior surface portion whose outer surface faces the vehicle outer side, and a joint portion which has a joint surface contacting the weld surface and is joined to the case, and a portion of the joint portion including at least the joint surface is formed of a synthetic resin of the same type as the case.

In this case, the portion of the joint portion formed of the same synthetic resin as the synthetic resin forming the housing is welded to the housing, so that residual stress is less likely to occur in the joint portion between the cover and the housing

In a second aspect, in the vehicle frame structure of the present invention, it is preferable to use an acrylonitrile-butadiene-styrene copolymer synthetic resin or an acrylonitrile-acrylate-styrene copolymer synthetic resin as the predetermined synthetic resin.

Thus, at least a part of the joint is formed of an acrylonitrile-butadiene-styrene copolymer synthetic resin or an acrylonitrile-acrylate-styrene copolymer synthetic resin.

In a third aspect, in the vehicle frame structure according to the present invention, it is preferable that the entire cover be formed of the same type of synthetic resin.

Thus, the cover is formed of a single synthetic resin.

In a fourth aspect, in the vehicle frame structure of the present invention, it is desirable that the entire cover be transparent.

Thus, since the cover has no colored portion, the light emitted from the light source is not shielded by the cover.

In a fourth aspect, in the frame structure for a vehicle of the present invention, it is desirable that the cover is joined to the housing by laser welding.

Thereby, synthetic resins of the same kind are joined by laser welding.

Effect of the utility model

According to the present invention, since a part of the joint portion formed of synthetic resin of the same kind as the synthetic resin forming the housing is welded to the housing, it is difficult to generate residual stress at the joint portion of the cover and the housing, and the time or temperature of the annealing treatment is reduced or the annealing treatment is unnecessary in the joining operation of the cover to the housing, and it is possible to ensure that the cover is in a stable joined state with respect to the housing on the basis of reducing the manufacturing cost.

Drawings

Fig. 1 is a rear view showing a state in which a vehicle lamp is disposed in a vehicle, and together with fig. 2 to 6, an embodiment of a vehicle frame structure according to the present invention is shown.

Fig. 2 is a sectional view of the vehicle frame structure.

Fig. 3 is an enlarged cross-sectional view showing an example in which a part of the joint portion is formed of synthetic resin of the same kind as that of the synthetic resin forming the case.

Fig. 4 is an enlarged cross-sectional view showing an example in which the entire joint portion is formed of synthetic resin of the same kind as that forming the case.

Fig. 5 is a cross-sectional view showing an example in which the entire cover is formed of synthetic resin similar to the synthetic resin forming the housing.

Fig. 6 is a cross-sectional view showing an example in which the entire joint portion provided with the protrusion is formed of synthetic resin of the same kind as that of the synthetic resin forming the case.

Description of the figures

1 … vehicle lamp, 2 … casing, 3 … cover, 6a … welding surface, 7 … appearance surface, 8 … joint part and 8a … joint surface

Detailed Description

hereinafter, embodiments of the vehicle frame structure according to the present invention will be described with reference to the drawings.

The following embodiments apply the vehicle housing structure of the present invention to a vehicle lamp, for example, a housing structure of a combination tail lamp having a tail lamp function. The present invention can be widely applied to a frame structure of various vehicle lamps such as a headlamp, a turn signal lamp, a width indicator lamp, a brake lamp, a daytime running lamp, a turn indicator lamp, a hazard lamp, a position lamp, a backup lamp, a fog lamp, or a combination lamp of these lamps.

In the following description, the irradiation direction of light from the light source to the outside is defined as the rear direction. However, the front, rear, upper, lower, left and right directions shown below are for convenience of description, and the practice of the present invention is not limited to these directions.

The vehicle lamps 1 and 1 are disposed, for example, in a portion near both left and right ends of the vehicle 100 (see fig. 1). The vehicle 100 is configured such that the sensor units 50, 50 are mounted on the outer sides of the vehicle lamps 1, 1 in the left-right direction, respectively. The sensor unit 50 includes, for example, a sensor, not shown, for measuring a distance therein, and measures a distance between the vehicle 100 and another vehicle, a distance between the vehicle 100 and a pedestrian, or the like.

The vehicle lamp 1 includes, as a housing structure (vehicle housing structure): a casing 2 opened at the rear, and a cover 3 (see fig. 2) closing an internal space 2a of the casing 2. The housing 2 and the cover 3 constitute a lamp housing 4. In the vehicle lamp 1, the cover 3 is joined to the housing 2 by welding.

In addition to the light source 5 that emits light, necessary members such as a light guide, not shown, that guides light emitted from the light source 5 in a predetermined direction, or a reflector that reflects light are disposed inside the lamp housing 4.

The housing 2 is made of synthetic resin, and is formed into a bowl shape that is open rearward, for example. An opening edge of the case 2 is provided as a welded portion 6 to which the cover 2 is joined by welding, and a tip end surface (rear surface) of the welded portion 6 is formed as a welded surface 6 a.

The housing 2 is formed of a styrene-based synthetic resin such as an ABS resin (acrylonitrile-butadiene-styrene copolymer synthetic resin) or an AAS resin (acrylonitrile-acrylate-styrene copolymer synthetic resin).

Styrene-based synthetic resins have high moldability, and include ABS resins and AAS resins, AS resins (acrylonitrile-styrene copolymer synthetic resins), and the like. The AS resin is superior to polystyrene in strength, weatherability, chemical resistance, heat resistance, and the like.

ABS resins are resins having high strength and high impact resistance, and can achieve both high strength and high impact resistance by combining the properties of acrylonitrile resins and styrene resins, which are hard but weak and easily broken against impact, and the properties of butadiene resins, which are soft but strong against impact. In addition, the ABS resin is a resin which achieves an improvement in strength and an improvement in heat resistance and chemical resistance by copolymerizing polystyrene and butadiene, which is a rubber as a constituent component, and simultaneously copolymerizing acrylonitrile.

AAS resin is a synthetic resin obtained by copolymerizing acrylonitrile, acrylic rubber (acrylate) and styrene, and is used for the same purpose as ABS. Since the AAS resin contains an acrylic rubber, it has high weatherability compared to an ABS resin containing butadiene (butadiene rubber). Therefore, AAS is a synthetic resin capable of securing high weatherability while maintaining high strength and high impact resistance.

The ABS resin and the AAS resin are generally colored and thus opaque, but may be formed of a synthetic resin containing no coloring pigment, in which case the ABS resin and the AAS resin are formed of a transparent synthetic resin.

The cover 3 is formed of a transparent material such as acrylic resin, from which a part is removed, and is formed in a substantially flat plate shape or a plate shape curved so as to protrude outward, for example. The cover 3 has an outer appearance face portion 7 and a joining portion 8.

acrylic resins, also known as "plexiglas" or "windscreens", are resins that have high strength and high transparency. Further, acrylic resins are lightweight, are thermoplastic resins, and therefore have the property of being easily bent by heating, and are materials having appropriate hardness and high workability.

The exterior surface portion 7 is a portion whose outer surface faces the outside of the vehicle except for the outer peripheral portion of the cover 3. The exterior surface portion 7 is a portion through which light emitted from the light source 5 passes, and the light emitted from the light source 5 passes through the exterior surface portion 7 and is radiated to the outside.

The joint 8 is a portion on the outer peripheral side of the design surface portion 7, and is provided as the outer peripheral portion of the cover 3. The joint 8 is a portion joined to the welded portion 6 of the case 2 by welding, and the front surface is formed as a joint surface 8 a.

The joint portion 8 includes a portion 9 of the joint surface 8a, and is formed of, for example, synthetic resin similar to the synthetic resin forming the case 2 in approximately the front half (see fig. 3). In each figure, the synthetic resin "of the same type" as the synthetic resin forming the case 2 is indicated by a peaked mark. Therefore, the joint portion 8 is formed of a styrene-based synthetic resin such as an ABS resin or an AAS resin, and the like, at the portion 9. The engaging portion 8 may be transparent or opaque.

The joint 8 may be entirely formed of a synthetic resin of the same kind as the synthetic resin forming the case 2, for example, a styrene-based synthetic resin such as an ABS resin or an AAS resin (see fig. 4).

As described above, the portion 9 of the cover 3 where the joint portion 8 is formed or the entire joint portion 8 is formed of the same synthetic resin as that forming the case 2, and the portion other than the portion 9 or the portion other than the joint portion 8 is formed of a transparent material such as acrylic resin. Therefore, in the case where the portion 9 is formed of the same kind of synthetic resin as that forming the case 2, the portion of the joint portion 8 other than the portion 9 and the design surface portion 7 are formed of acrylic resin or the like, and in the case where the entire joint portion 8 is formed of the same kind of synthetic resin as that forming the case 2, the design surface portion 7 is formed of acrylic resin or the like.

The cover 3 is formed of different kinds of synthetic resins in this way, and can be formed by so-called multicolor molding (two-color molding) in which a mold cavity is filled with different kinds of synthetic resins as molten resins, for example.

In the vehicle lamp 1, since the cover 3 can be formed by multicolor molding, it is possible to achieve reduction in manufacturing cost due to high molding accuracy and short molding time of the cover 3.

The cover 3 can be formed by, for example, so-called insert molding in which a portion 9 or a joint portion 8 formed of synthetic resin similar to the synthetic resin forming the case 2 is disposed at a predetermined position in a mold cavity and a molten resin such as acrylic resin is filled in the cavity.

The entire cover 3 may be formed of a synthetic resin for forming the case 2 or a similar transparent synthetic resin (see fig. 5). In this case, since the cover 3 is formed of a single synthetic resin, the cover 3 can be easily formed while reducing the manufacturing cost.

However, when the cover 3 is entirely formed of a styrene-based synthetic resin, it may be impossible to secure sufficient strength (hardness) of the cover 3, and therefore, it is desirable to apply a transparent coating for improving strength to the surface of the cover 3.

further, the joint portion 8 is provided with a projection (leg) 10 to be joined to the welding portion 6 of the case 2, and the tip end surface of the projection 10 may be formed as a joint surface 8a (see fig. 6). In this case, at least a part of the joint surface 8a including the protrusion 10 may be formed of the same synthetic resin as that of the case 2.

Even when the projection 10 is provided, the entire cover 3 may be formed of the same synthetic resin as that forming the case 2.

In the vehicle lamp 1 configured as described above, when the joint portion 8 is transparent, the cover 3 is joined to the housing 2 by laser welding, for example. The joining of the cover 3 to the case 2 by laser welding is performed by irradiating the joining portion 8 with laser light from an unillustrated irradiation head from the outer surface side.

The laser light irradiated to the joining portion 8 passes through the joining portion 8 and reaches the soldering surface 6a of the case 2. When the laser reaches the welding surface 6a, the contact portion between the joining portion 8 and the welding portion 6 is melted, and the cover 3 is joined to the case 2.

In this way, the cover 3 is joined to the housing 2 by laser welding, and synthetic resins of the same kind are joined to each other by laser welding, so that high joinability of the cover 3 to the housing 2 can be ensured.

As the welding method, a scanning method of moving the irradiation head along the joint portion 8 to perform laser irradiation, or a galvanometer method of operating a galvanometer mirror inside the irradiation head in a state where the irradiation head is fixed to perform laser irradiation may be used. Further, as the welding method, a hybrid type of laser irradiation by a scanning type and a galvanometer type depending on the irradiation position can be used.

The joining of the cover 3 to the case 2 may be performed by various methods other than laser welding, such as hot plate welding and vibration welding, without being limited by whether the joined portion 8 is transparent.

As described above, in the housing structure of the vehicle lamp 1, at least the portion of the joint portion 8 including the joint surface 8a is formed of the same kind of synthetic resin as the predetermined synthetic resin forming the housing 2.

Therefore, since the joint portion 8 made of synthetic resin similar to the synthetic resin forming the case 2 is joined to the case 2 by welding, residual stress is less likely to occur at the joint portion between the cover 3 and the case 2, and in the joining work of the cover 3 to the case 2, the time and temperature of the annealing treatment are reduced or the annealing treatment is unnecessary, and a stable joined state of the cover 3 to the case 2 can be secured while reducing the manufacturing cost.

Further, since at least a part of the joint portion 8 is formed of ABS resin or AAS resin by using ABS resin or AAS resin as the same type of synthetic resin forming the cover 3, it is possible to ensure a stable joint state of the cover 3 with respect to the housing 2 while ensuring high strength and high impact resistance of the housing 2.

Further, since the cover 3 is transparent as a whole and there is no colored portion on the cover 3, the light emitted from the light source 5 is not shielded by the cover 3, and a stable joined state of the cover 3 to the housing 2 can be ensured while achieving high light emission efficiency.

Further, since there is no colored portion in the cover 3, the appearance of the cover 3 can be improved.

The foregoing description shows an example in which the vehicle frame structure of the present invention is applied to the frame structure of the vehicle lamp, but the application of the vehicle frame structure of the present invention is not limited to the frame structure of the vehicle lamp, and the present invention can be widely applied to a frame structure of another structure that is provided in a cover of a vehicle and is joined to a housing by welding.

For example, the vehicle frame structure of the present invention may be applied to the frame structure of the sensor unit 50 (see fig. 1). The sensor unit 50 also includes a housing that opens rearward and a cover that closes an inner space of the housing, as in the vehicle lamp 1, and the housing and the cover constitute a lamp outer frame.

Therefore, in the sensor unit 50, the frame structure for a vehicle according to the present invention can be applied to the frame structure of the sensor unit 50 in a case where the cover is joined to the housing by welding.

The vehicle housing structure of the present invention can be applied to other structures provided in a vehicle, such as a camera unit in which an imaging device such as a camera is disposed in a lamp housing including a housing and a cover.

Claims

1. A vehicle frame structure is provided with:

A case having a welding surface and formed of a predetermined synthetic resin;

A cover joined to the housing by welding;

The cover is provided with an exterior surface portion whose outer surface faces the vehicle outer side, and a joint portion which has a joint surface contacting the weld surface and is joined to the case, and a portion of the joint portion including at least the joint surface is formed of a synthetic resin of the same type as the case.

2. The frame structure for a vehicle according to claim 1,

as the predetermined synthetic resin, acrylonitrile-butadiene-styrene copolymer synthetic resin or acrylonitrile-acrylate-styrene copolymer synthetic resin is used.

3. The frame structure for a vehicle according to claim 1 or 2,

The entirety of the cover is formed of the same kind of synthetic resin.

4. The frame structure for a vehicle according to claim 1 or 2,

The cover is transparent throughout.

5. The frame structure for a vehicle according to claim 1 or 2,

The cover is joined to the housing by laser welding.