JPH0534472U - Female screw holding part of synthetic resin tank for heat exchanger - Google Patents

Abstract

(57) [Summary] [Purpose] The present invention relates to a structure of a female screw holding portion that houses a female screw for mounting a component on an outer wall surface of a synthetic resin tank for a heat exchanger and firmly holds the female screw without corroding it. is there. [Structure] As shown in FIGS. 3 to 5, the nut holding portion 9 is fitted with a pair of left and right side wall pieces 17 integrally protruding outward from an outer wall surface of the tank 2 and a male screw 26. An outer wall piece 19 having a male screw hole 18 that can be integrally connected to the outer edges of the pair of both side wall pieces 17, and the both side wall pieces 17 protruding integrally from the outer wall surface of the tank 2; A bottom wall piece 20 integrally connected to a bottom edge of the outer wall piece 19, and a holding piece 21 arranged between the outer wall surface of the tank 2 and the outer wall piece 19 in parallel with the outer wall piece 19. Further the tank 2
On the upper center in the width direction of the inner surface of the outer wall piece 19 opposite to the outer wall surface of the outer wall piece, a locking projection that engages with the upper end of the female screw 25 in a detachable manner is projected. And locking projection 22
A pair of upper and lower cutouts 23 and 24, which are continuous at the same height as the lower surface of the above, are provided above and below the male screw hole 18.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a female screw holding portion that accommodates a female screw for mounting a component such as a fan shroud on an outer wall surface of a synthetic resin tank for a heat exchanger such as a vehicle radiator.

[0002]

[Prior Art and Problems to be Solved]

 Conventionally, in order to mount parts such as fan shrouds on the outer wall surface of a synthetic resin tank for a heat exchanger, a female screw holding portion for housing a female screw such as a nut has been integrally formed on the outer wall surface of the tank.

For example, in the one disclosed in JP-A-1-131896, as shown in FIG. 6, the nut 03 housed in the nut holding portion 02 provided on the outer wall surface 01 of the tank is the nut 03. A protrusion 04 is formed on the nut 03 so as not to fall off from the holding portion 02, and the protrusion 04 is adapted to be engaged with the upper cutout 07 of the bolt through hole 06 in the outer wall piece 05 of the nut holding portion 02. It was As another embodiment of the above-mentioned JP-A-1-131896, as shown in FIGS. 7 to 8, a cylindrical portion 08 is formed at the rear of the nut 03 and a holding piece 09 of the nut holding portion 02 is provided. The reverse Ω-shaped portion 010 was formed, and the cylindrical portion 08 of the nut 03 was fitted into the reverse Ω-shaped portion 010.

However, in any of these component mounting structures, it is necessary to form the protrusion 04 or the cylindrical portion 08 on the nut 03, so that it is not possible to use a nut having an ordinary shape, and cost increase cannot be avoided. Also, since the nut holding portion 02 does not have a water drain hole, there is a risk that water will collect and the nut 03 will corrode.

[0005] As disclosed in Japanese Utility Model Laid-Open No. 3-71276, filed by the applicant of the present invention, in which such defects are eliminated, as shown in FIGS. 9 to 12, a synthetic resin tank is used. By forming the locking protrusion 014 on the inner surface of the top of the outer wall piece 013 of the nut holding portion 012 provided in 011 and forming the rectangular drain hole 016 in the bottom wall piece 015 of the nut holding portion 012, We have made it possible to use the nut 017 of ordinary shape to improve the cost down and durability, but in order to mold the nut holding part 012 of such shape with the synthetic resin tank 011 integrally, It is necessary to insert a cutting die for defining the lower surfaces of 016 and the locking projection 014 from the bottom to the top through the drain hole 016 into the nut holding part 012, and the tank edge part bulges outward. This structure can be applied to the tank 011 with the There was no. A bolt hole 018 is formed in the outer wall piece 013, and a thin pressing piece 020 having a U-shaped cutout 019 is provided rearward of the water draining hole 016 and is erected independently of the side wall piece 021.

[0006]

[Means and Actions for Solving the Problems]

 The present invention relates to improvement of a female screw holding portion of a synthetic resin tank for a heat exchanger, which overcomes such difficulties, and an integrated female screw holding portion for housing a female screw is provided on an outer wall surface of the synthetic resin tank for a heat exchanger. In the component mounting structure in which the component is mounted by penetrating the female screw holding portion and screwing and tightening the male screw to the female screw in the female screw holding portion, the female screw holding portion includes: An outer wall integrally provided with a pair of both side wall pieces projecting integrally from the outer wall surface of the tank, and male screw holes into which the male screw can be inserted and connected to side edges of the pair of both side wall pieces. A piece, a bottom wall piece that integrally projects from the outer wall surface of the tank and is integrally connected to the bottom edges of the both side wall pieces and the outer wall piece, and a pressing portion provided on the tank outer wall or the tank outer wall, It is called a holding piece placed between the outer wall pieces. A locking projection that engages with the upper end of the female screw in a disengageable manner is projectingly provided at an upper portion of the inner surface of the outer wall piece facing the outer wall surface of the tank in the widthwise center, and the outer wall piece has the bottom wall piece. It is characterized in that a pair of upper and lower notches that are continuous at the same height as the upper surface and the lower surface of the locking projection are provided above and below the male screw hole.

Since the present invention is configured as described above, by simply pushing the female screw from above the female screw holding portion toward the female screw holding portion, the upper portion of the outer wall piece is elastically turned outward. After being deformed, the female screw rides over the locking projection and is inserted into the female screw holding portion. Further, in the present invention, since the female screw inserted in the female screw holding portion is locked by the locking protrusion, the female screw does not fall off from the female screw holding portion.

Further, in the present invention, since the notch that is continuous with the upper surface of the bottom wall is provided under the male screw hole, even if the drain hole is not formed in the bottom wall piece. However, the water that has penetrated into the female screw holding portion is discharged to the outside through the notch below the male screw hole, and the water does not collect in the female screw holding portion. Corrosion of the screwed portion and the female screw is prevented in advance, and the durability is greatly improved.

Furthermore, since the present invention is configured as described above, the upper and lower cutout surfaces of the male screw hole, the lower surface of the locking projection, and the upper surface of the bottom wall piece are defined. The mold for the tank and the female screw holding portion can be constructed by simply inserting the punching die into the male screw hole from the outside of the outer wall piece. The integral female screw holding portion can be molded with high efficiency, and in combination with the use of the female screw having a simple shape, the cost can be greatly reduced. Moreover, in the present invention, since it is not necessary to insert the punching die from the lower side to the upper side of the female screw holding portion, the tank outer wire portion below the female screw holding portion also forms a tank bulging outward. Therefore, the degree of freedom in the shape of the tank made of synthetic resin for the heat exchanger becomes extremely wide.

[0010]

【Example】

 Hereinafter, an embodiment of the present invention shown in FIGS. 1 to 5 will be described. The upper and lower tanks 2a, 2b of the radiator 1 are made of synthetic resin, and the header plate 3 is caulked to the lower open end of the upper tank 2a and the upper open end of the lower tank 2b to form a tank space. Has been done.

The upper tank 2a is provided with a cooling water inlet 4, a cap 5, a radiator mounting leg 6 and the like, and a fixed female screw portion 8 for mounting the fan shroud 7 and a main component of the present invention. A nut holding portion 9 which is a female screw holding portion is provided on the left and right sides of the rear surface of the tank 2a.

Further, the lower tank 2b is provided with a cooling water discharge port 10, a drain cock 11, a radiator mounting leg 6, an oil inlet / outlet port 12 of an attached oil cooler, and the like, and a nut holding member for attaching the fan shroud 7. The part 9 is provided on the left and right sides of the rear surface so as to project.

Furthermore, a large number of parallel flat tubes 13 which penetrate the header plate 3 and communicate the upper and lower tanks 2a, 2b are arranged at equal intervals in the left-right direction, and are brazed to the header plate 3 by brazing. Corrugated heat radiation fins 14 are provided between both side surfaces of the flat tube 13, and bent portions of the corrugated heat radiation fins 14 are in contact with both side surfaces of the flat tube 13 in a low contact manner.

Moreover, the core portion of the radiator 1 including the flat tube 13 and the corrugated heat radiation fins 14 is firmly held by the side frame 15 integrally connected to the upper and lower header plates 3. In the fixed female screw portion 8, a metallic cylindrical nut 16 is fitted integrally with the upper tank 2a.

Further, as shown in FIGS. 3 to 5, the nut holding portion 9 is fitted with a pair of left and right side wall pieces 17 integrally protruding outward from the outer wall surface of the tank 2 and a male screw 26. An outer wall piece 19 having a male screw hole 18 that can be inserted and integrally connected to the outer edges of the pair of both side wall pieces 17, and the both side wall pieces that project integrally from the outer wall surface of the tank 2. 17 and a bottom wall piece 20 integrally connected to the bottom edge of the outer wall piece 19, and a holding piece 21 arranged between the outer wall surface and the outer wall piece 19 of the tank 2 in parallel with the outer wall piece 19. Has become

Further, a locking projection 22 that engages with the upper end of the female screw 25 in a disengageable manner is provided at the upper center of the inner surface of the outer wall piece 19 facing the outer wall surface of the tank 2 in the width direction. A pair of upper and lower cutouts 23 and 24, which are continuous with the upper surface of the bottom wall piece 20 and the lower surface of the locking projection 22, are provided above and below the male screw hole 18. The pressing piece 21 also has a notch 27 through which the male screw 26 can pass.

Since the present invention shown in FIGS. 1 to 5 is configured as described above, the male mold (not shown) formed on the mold surface having the same shape as the inner wall surface of the tank 2 and the tank 2 are formed. The inner and outer surfaces of the side wall piece 17, the inner and outer surfaces of the outer wall piece 19, the inner and outer surfaces of the holding piece 21, the top and bottom surfaces of the side wall piece 17, the outer wall piece 19, the holding piece 21 and the bottom wall piece 20 of the outer wall surface and the nut holding portion 9. Female mold (not shown) formed on the mold surface having the same shape as the upper surface of the tank, and a partial female mold (not shown) formed on the lower surface of the bottom wall piece 20 and the mold surface having the same shape as the outer wall surface of the tank 2 below it. The nut holding portion 9 is made integral by combining a mold and a not-shown mold having the same shape as the male screw hole 18 and the notches 23, 24, and filling the space defined by these molds with synthetic resin. The synthetic resin tank 2 can be molded efficiently and easily.

Further, since the upper surface of the notch 24 formed below the male screw hole 18 of the outer wall piece 19 is at the same height as the upper surface of the bottom wall piece 20, it is possible to prevent rain from pouring on the nut holding portion 9. Even if water enters the nut holding portion 9, it is discharged to the outside of the nut holding portion 9 through the male screw hole 18, and as a result, the screwed portion between the female screw 25 and the male screw 26 and the generation of the female screw 25. Rust is prevented in advance and the parts can be held firmly for a long period of time.

Further, since it is not necessary to provide a water draining hole in the bottom wall piece 20, it is not necessary to dispose the cutting die so as to be detachable from the lower side of the nut holding portion 9 to the upper side. As a result, the nut holding portion The lower edge portion 28 of the tank 2 below 9 can be formed to bulge outward, and the header plate 3 can be reliably and easily formed on the tank 2.

Although the pressing piece 21 is formed apart from the main body of the tank 2 in the above embodiment, the main body portion of the tank 2 at this position may be bulged outward to form the pressing portion.

[Brief description of drawings]

FIG. 1 is a front view of a radiator provided with a female screw holding portion of a synthetic resin tank according to the present invention.

FIG. 2 is a side view showing a state in which a fan shroud, which is a type of parts, is attached to a radiator.

FIG. 3 is a perspective view of an essential part of an embodiment of the present invention.

FIG. 4 is a front view thereof.

5 is a vertical side view cut along the line VV of FIG. 4. FIG.

FIG. 6 is a vertical sectional side view of a nut holding portion corresponding to a conventional female screw holding portion.

FIG. 7 is a vertical sectional side view of another conventional nut holding portion.

FIG. 8 is an explanatory diagram illustrating a nut mounting state of the nut holding portion illustrated in FIG. 7.

FIG. 9 is a plan view of the nut holding portion shown in Japanese Utility Model Laid-Open No. 3-71276, which is the application of the present applicant.

10 is a vertical cross-sectional side view cut along the line XX of FIG.

11 is a transverse cross-sectional view cut along the line XI-XI of FIG.

FIG. 12 is a cross-sectional view cut along the line XII-XII in FIG.

[Explanation of symbols]

1 ... radiator, 2 ... tank, 3 ... header plate,
4 ... Cooling water inlet, 5 ... Cap, 6 ... Radiator mounting leg, 7 ... Fan shroud, 8 ... Fixed female screw part, 9 ...
Nut holding part, 10 ... Cooling water discharge port, 11 ... Drain cock, 12 ... Oil inlet / outlet, 13 ... Flat tube, 14 ... Corrugated heat radiation fin, 15 ... Side frame, 16 ... Cylindrical nut, 17 ...
Side wall piece, 18 ... Male screw hole, 19 ... Outer wall piece, 20 ... Bottom wall piece, 21 ...
Presser piece, 22 ... Locking protrusion, 23, 24 ... Notch, 25 ... Female screw,
26… Male screw, 27… Notch, 28… Lower edge.

Claims (1)

[Scope of utility model registration request] 1. A female screw holding portion capable of accommodating a female screw is integrally formed on an outer wall surface of a synthetic resin tank for a heat exchanger, and the female screw holding portion penetrates the female screw holding portion to form a female screw inside the female screw holding portion. In a component mounting structure capable of mounting a component by screwing and tightening a screw, the female screw holding portion fits a pair of both side wall pieces integrally protruding from an outer wall surface of the tank and the male screw. An outer wall piece that is provided with a male screw hole that can be inserted and that is integrally connected to the side edges of the pair of side wall pieces;
Between the bottom wall piece that integrally protrudes from the outer wall surface of the tank and is integrally coupled to the bottom edges of the both side wall pieces and the outer wall piece, and a holding portion provided on the tank outer wall or between the tank outer wall and the outer wall piece. It consists of a presser piece that is placed,
A locking projection that engages releasably with the upper end of the female screw is provided at an upper portion of the inner surface of the outer wall piece facing the tank outer wall surface in the center in the width direction, and the outer wall piece has an upper surface of the bottom wall piece and A female screw holding portion of a synthetic resin tank for a heat exchanger, characterized in that a pair of upper and lower cutouts which are continuous at the same height as the lower surface of the locking projection are provided above and below the male screw hole.