JPH0127498Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a hollow beam-like structural member that is installed in a vehicle such as an automobile in a substantially horizontal direction. The present invention relates to a structural member for a vehicle provided at the lower part of a vehicle body.

(Prior Art) For example, the front side frame of an automobile has a hollow box-shaped cross section to reduce weight, but such a front side frame is installed almost horizontally at the bottom of the front of the vehicle body. Therefore, water etc. tend to accumulate inside. Therefore, the inner surface of such a hollow structural member, which is installed substantially horizontally in the lower part of the vehicle body, is sprayed and coated with wax to provide anti-rust treatment to the inner surface.

In that case, the waxing is usually done after the bodyshell assembly and painting process has been completed. Therefore, for example, wax is sprayed into the interior of the front side frame from the front opening while the dash board is assembled to the front side of the dash board and held substantially horizontally.

The method generally used for applying wax to the inside of the front side frame will be explained with reference to FIGS. 5 and 6.

As shown in FIG. 5, front side frames 1 serving as structural members are provided substantially horizontally in the longitudinal direction at the lower portions of both sides of the front portion of the vehicle body.
This side frame 1 has a hollow box-shaped cross section,
Alternatively, it has a U-shaped cross section, and together with the wheel house 2 welded to its outer surface, it forms a hollow box-shaped cross section, and an opening 3 is provided in the front surface thereof. Further, a dart board 4 is welded to the rear portion thereof, and is further connected to a side sill 6 via a front outrigger 5.

When applying wax to the inside of the front side frame 1 assembled in this way, as shown in FIG. Spray wax. By moving the nozzle 7 back and forth and adjusting its inclination vertically and horizontally as appropriate, the side frame 1
Ensure that the wax is evenly applied to the inner surface of the

After that, the bumper, the subframe that supports the engine, etc. are assembled.

(Problems to be Solved by the Invention) By the way, this subframe for supporting the engine is normally assembled with bolts inserted from the lower surface side of the front side frame 1. For this purpose, a nut 8 is welded to the inner surface of the bottom wall 1a of the front side frame 1, as shown in FIG. The screw hole 8a of this nut 8 opens toward the inside of the side frame 1. Further, as described above, since the subframe is not assembled at the time of wax application, no bolt is screwed into the nut 8. Therefore, if wax is sprayed in this state, the screw hole 8a of the nut 8 will be
Wax adheres to the surface.

If the wax adheres to the threaded hole 8a of the nut 8 in this way, it becomes impossible to obtain sufficient tightening force when tightening the bolt. Further, depending on the amount of adhesion, the coefficient of friction between the threaded portion of each nut 8 and the bolt differs, making it impossible to obtain a stable tightening load.

Conventionally, the position and inclination of the wax application nozzle 7 was adjusted to prevent the wax from flowing into the threaded hole 8a of the nut 8 when spraying. The inner surface of a hollow structural member such as the frame 1 must rely on the intuition of the operator, and therefore, it requires great skill to ensure that the wax is evenly applied to the inner surface of the side frame 1. It was becoming.

The present invention was developed in view of these problems, and its purpose is to prevent wax from adhering to the nuts provided on the inner surface when wax is applied to the inner surface of the hollow structural member. The goal is to avoid this.

(Means for solving the problem) In order to achieve this object, in the present invention, the nut provided on the inner surface of the hollow structural member is covered by a cover attached to the inner surface. The cover may be of any type as long as it can cover at least the upper part of the nut, and an opening is provided in the side surface of the cover.

(Function) By providing such a cover, the wax blown out from the application nozzle is blocked by the cover, and therefore does not flow into the screw hole of the nut. Wax has a fairly high viscosity, so even when it is blown out of a nozzle, it tends to fall downward. Therefore, even with a cover that covers only the upper part of the nut, most of the wax can be blocked.

The openings on the sides of the cover ensure ventilation inside the cover, so even when immersed in the coating solution, the coating solution will spread throughout the interior of the cover, allowing the coating to be coated. will be applied to the entire surface.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

In the figures, Figures 1 and 2 show an embodiment in which the present invention is applied to a front side frame of an automobile. front side frame,
FIG. 3 is a longitudinal cross-sectional view showing the working state when wax is applied to the inner surface. In these figures, the same parts as those shown in FIGS. 5 and 6 described above are given the same reference numerals.

As is clear from FIGS. 1 and 2, bolt insertion holes 1b are provided in the bottom wall 1a of the front side frame 1, and screw holes 8a are aligned with the bolt insertion holes 1b on the inner surface of the bottom wall 1a. Natsuto 8
is welded. A cover 9 is attached to cover the nut 8. As shown in FIG. 1, the cover 9 has a substantially cylindrical shape with a flat top surface 9a, and is formed by pressing a thin steel plate. The cover 9
The height of the subframe 10 is set to be high enough to receive the tip of the tightening bolt 11 when the subframe 10 is assembled as shown by the imaginary line in FIG. Further, the side surface 9b of the cover 9 is provided with an elongated opening 12 extending over the entire height. This opening 12 is located in the side frame 1
oriented in a direction substantially perpendicular to the longitudinal axis of the. A flange 9c is formed at the bottom of the cover 9.
c is adapted to be spot welded to the inner surface of the bottom wall 1a of the side frame 1.

The front side frame 1, to which the nuts 8 and cover 9 are welded in this manner, is assembled to the front surface of the dash board 4 to form a body shell. The body shell is then immersed in a coating solution for electrodeposition coating. At that time, the coating liquid flows into the inside of the side frame 1 through the front opening 3 etc., flows into the cover 9 through the bolt insertion hole 1b and the screw hole 8a of the nut 8, and passes through the opening 12 of the cover 9. It flows into the inside of the side frame 1. During this time, the air inside the cover 9 flows out from the upper part of the opening 12 provided in the side surface 9b. Therefore, the flow of the coating liquid into the cover 9 is not obstructed.

When the electrodeposition coating is completed, the body shell is lifted from the coating solution bath. At this time, the coating liquid in the side frame 1 flows out from an opening for draining the coating liquid provided at the bottom of the side frame 1. And cover 9
The coating liquid inside flows out through the screw hole 8a of the nut 8 and the bolt insertion hole 1b, and also flows out through the cover 9.
It flows out through an opening 12 provided in the side surface 9b of the. Since this opening 12 is provided up to the bottom of the cover 9, no coating liquid remains inside the cover 9.

After the paint on the body shell thus painted has dried, wax is applied to the inner surfaces of the hollow structural members such as the front side frame 1. When applying wax to the inner surface of the front side frame 1, the application nozzle 7 is inserted through the opening 3 in the front surface of the frame in a substantially horizontal state, and the wax is sprayed from the nozzle 7, as in the conventional case. Then, the wax is ejected backward from the nozzle 7 along the longitudinal direction of the side frame 1, as shown by the arrow in FIG. 2, and then falls downward due to gravity. Therefore, most of the wax is blocked by the top surface 9a of the cover 9, and is prevented from being sprayed onto the nut 8. An opening 12 is provided in the side surface 9b of the cover 9. Since the opening 12 is provided perpendicularly to the nozzle 7, that is, perpendicularly to the wax spraying direction, the cover 9 can be opened from the opening 12. Wax hardly ever flows into the inside of the tank.

In this way, even when the wax is sprayed onto the inner surface of the side frame 1 using the conventional method, the wax does not penetrate into the screw hole 8a of the nut 8.
Since there is no risk of the wax adhering to the side frame 1, there is no problem in applying the wax to the entire inner surface of the side frame 1, and it becomes easy to apply the wax uniformly.

The sub-frame 10 is assembled on the lower surface of the side frame 1 which has been subjected to rust prevention treatment by applying wax in this manner. This assembly is performed using the bolt 11 inserted from below, but by covering the nut 8 with the cover 9 as described above, wax is prevented from adhering to the screw hole 8a. A predetermined friction coefficient is obtained between the bolt 11 and the nut 8,
The tightening can be performed reliably with a constant torque. Therefore, the tightening work is also facilitated.

Even when the bolt 11 is screwed into the nut 8, the inside of the cover 9 is open to the outside through the opening 12 provided on the side surface 9b, so that sufficient ventilation inside the cover 9 is ensured. be done. Therefore, rust is also prevented from forming inside.

The shape of the cover 9 is not limited to the shape of the above embodiment, and may be, for example, a rectangular tube shape. Further, as shown in FIG. 3, the top surface 9a may be a roof-shaped sloped surface. By doing so, the press molding becomes easy. In that case as well, the opening 12
is desirably provided at the same height as the highest part of the cover 9.

The nuts 8 provided on the inner surface of the front side frame 1 etc. are not necessarily welded to the inner surface, but in order to provide flexibility in the position of the bolts 11, the nuts 8 are not necessarily welded to the inner surface of the front side frame 1 etc. A floating nut 8 may also be used. In such a case, the cover 9 can be provided with a step so that the step 9d functions as a retainer that restricts the upward movement and rotation of the nut 8.

In the above embodiment, the opening 12 provided on the side surface 9b of the cover 9 is elongated and extends over the entire height of the cover 9, but it is not possible to ensure ventilation inside the cover 9. If so, it may be a circular opening, for example.
However, in such a case, it is desirable that the opening be provided at both the top and bottom of the cover 9. Furthermore, as mentioned above, when wax is sprayed, the wax tends to fall from above, so if the nut 8 is covered above, the wax can be prevented from adhering to the nut 8 to a considerable extent. Therefore, even if the side surface 9b of the cover 9 is left wide open, a sufficient effect can be obtained. That is, the cover 9 may be of any type as long as it can cover at least the upper part of the nut 8, and the opening 12 of the side surface 9b thereof may be wide.

The above description has been made using the front side frame 1 of an automobile as an example, but the present invention is not limited to this, and the present invention is not limited to this.
It is obvious that the method can be applied to other hollow structural members as long as the inner surface is coated with wax without being screwed together. Therefore, it will be clear that the nut 8 is not necessarily provided on the bottom wall of the hollow structural member, but may be provided on the side wall or the like.

(Effect of the invention) As is clear from the above explanation, according to the present invention, the nut provided on the inner surface of the hollow structural member
Since it is covered with a cover, even when wax is sprayed on the inner surface of the hollow structural member to perform rust prevention treatment, the wax will not adhere to the screw hole of the nut. Therefore, when spraying wax, there is no need for the troublesome work of adjusting the position of the wax application nozzle while being careful not to get the wax on the nuts, and the wax can be evenly applied to the inner surface of the hollow structural member. It also becomes easier to do so. Furthermore, since wax will not adhere to the nut, a constant tightening force can be obtained when tightening the bolt, and other members can be stably and reliably fixed.

An opening is provided on the side of the cover to allow communication between the inside and outside of the cover, so even when the hollow structural member is immersed in the coating solution, the cover will not allow the flow of the coating solution. Moreover, by ensuring ventilation through the cover, rust is prevented from forming inside the cover.

[Brief explanation of the drawing]

FIG. 1 is a cutaway perspective view of the main parts of a front side frame of an automobile as an embodiment of the hollow structural member for a vehicle according to the present invention, and FIG. Vertical cross-sectional view shown with spray coating state, No. 3
The figure is a longitudinal sectional view showing a modification of the cover attached to the front side frame, and FIG.
A vertical sectional view showing still another example of the nut and cover attached to the front side frame,
FIG. 5 is a perspective view of the front part of a body shell equipped with a general front side frame, and FIG. 6 is similar to FIG. FIG. 1...Front side frame (hollow structural member), 1a...Bottom wall, 1b...Bolt insertion hole, 3
...Front opening, 7...Wax application nozzle, 8...
...Nut, 8a...Screw hole, 9...Cover, 9a
...Top surface, 9b...Side surface, 10...Subframe, 11...Bolt, 12...Opening.

Claims (1)

[Claims for Utility Model Registration] In a hollow structural member for a vehicle, which is provided with a nut 8 on its inner surface for tightening a bolt 11 inserted from the outside, and which is sprayed with wax in a substantially horizontal state; A hollow structural member for a vehicle, comprising a cover 9 having an opening 12 on a side surface 9b, which covers at least an upper part of the nut 8 and can block wax from flowing into the screw hole 8a thereof.