JPH045804Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Industrial application field) This invention is applicable to, for example, brake devices for vehicles, etc.
The present invention also relates to a negative pressure tank used for supplying negative pressure to other devices that operate under negative pressure, and particularly relates to a resin-made tank in which a pair of bodies are integrated by welding.

(Prior Art) This type of resin negative pressure tank has a main body with a circular cross-sectional shape, as shown in, for example, Japanese Utility Model Application Publication No. 115165/1983, and inside the tank there is a mechanical There are reinforcing ribs to ensure strength.

(Problems to be Solved by the Invention) However, in vehicles and the like, due to limitations in installation space, a thin lunch box-like negative pressure tank is desired. For example, the thin negative pressure tank is used as a sub-tank for the main negative pressure tank, which has a circular cross-section, making it possible to supply stable negative pressure to vacuum boosters and the like.

As a method of obtaining a shallow resin tank that can be installed in such a narrow space, a method of welding a pair of shallow bodies to each other can be used.

However, after conducting various experiments, it was discovered that due to the influence of the internal reinforcing ribs, the main body would warp due to contraction and deformation during tank molding, resulting in poor welding.

The object of this invention is to provide a resin negative pressure tank whose main body is less likely to warp and which can prevent welding defects.

(Summary of the invention) In this invention, the reinforcing ribs inside the main body are intermittent ribs formed by notches.

The reinforcing ribs are disposed across the body from one inner surface to the other inner surface of the side wall portion of the body, and the notch divides such ribs. The notch in the middle of the reinforcing rib alleviates the effects of shrinkage deformation during molding, making it difficult for the main body to warp.

Further, in order to obtain sufficient mechanical strength, it is preferable that the reinforcing ribs are arranged in the same way for the pair of main bodies, and the ends of the corresponding reinforcing ribs on the opening side are welded. In that case, the notch also serves to communicate the plurality of chambers partitioned within the tank.

(Example) The example shown in the figure is a resin negative pressure tank 10 as a sub-tank that is connected between a main negative pressure tank having a slightly larger capacity and a vacuum booster using a three-way connector. This resin negative pressure tank 10 is installed so as to be slid into a narrow gap in an engine room. Therefore, its overall shape is a little special to avoid interference with surrounding equipment, and its thickness or depth is shallow compared to its size. For example, the ratio is about 1:10.

The resin negative pressure tank 10 includes a pair of main bodies 12, 1
4 by welding them together. Each main body 12, 14 is a molded product made of resin such as 66 nylon, and gates 12a, 14a for molding can be seen near the center of the outside. In addition, there are a total of three protrusions on both main bodies 12 and 14,
Two protrusions 16 on the main body 12 with a concave center
a, 16b are mere supports for mounting a bracket, whereas the integral protrusion 18 of the other body 14 is a joint for connecting pipes. Therefore, although the joint 18 communicates between the inside and outside of the negative pressure tank 10, the support parts 16a, 16b do not communicate between the inside and outside.
The negative pressure tank 10 is installed in the engine room using the support parts 16a, 16b and the flat parts 14b, 14c on the outer surface of the main body 14 side.

The pair of main bodies 12, 14 have different shapes, but one end is connected to the bottom wall parts 121, 141 that define the planar shape of each main body 12, 14, and the other end is connected to the bottom wall parts 121, 141. Welded parts 122a, 142
A common feature is that the side walls 122 and 142 have side walls 122 and 142 having a diameter of 1. The welded parts 122a and 142a are slightly thicker, and they are attached to each main body 1.
2 and 14 are formed.

Each of these bodies 12, 14 is provided with internal reinforcing ribs to increase mechanical strength. The reinforcing ribs are arranged in the same manner in each of the pair of main bodies 12, 14. Each reinforcing rib has a side wall portion 122,
142 from one inner surface to the other inner surface of each body 1
The first rib 2 extends across 2 and 14.
1, 41, and second ribs 22, 42 intersecting the first ribs 21, 41. There are a plurality of these first and second ribs 21, 41, 22, 42, and the whole has a lattice shape. Considering the shape of the negative pressure tank 10, the first ribs 21, 4
1 is the main rib, and the second ribs 22 and 42 are the subordinate ribs. The secondary ribs 22, 42 are thinner than the first ribs 21, 41, except for the intersections 23, 43 with the first ribs 21, 41, and are thinner than the first ribs 21, 41, and moreover, As the cross-sectional structure in Figure 5 shows,
The height of each second rib 22, 42 is
It is smaller than the depth of 2.14.

On the other hand, the main first ribs 21, 41 are thicker overall, and as shown in FIGS. 3 and 4, their height is about the same as the depth of each main body 12, 14. The opening side ends 21a and 41a are welded parts. At this point, the second ribs 22, 4
2, the intersections 23 and 43 are similar.

The effect of shrinkage deformation during molding is particularly problematic on the thick and tall first ribs 21 and 41 side. Therefore, in this negative pressure tank 10, the first ribs 21, 41 are made into intermittent ribs by providing notches 51, 52 at a plurality of locations along the longitudinal direction of the first ribs 21, 41. It is said that
The notches 51 and 52 correspond to each other in position in each of the pair of main bodies 12 and 14, and on the other hand, the first rib 2
Separate the welded parts at 1 and 41, and
The ribs 21, 41 themselves are separated. In order to reliably prevent the effects of shrinkage deformation, the notches 51,
52 completely separates the first ribs 21, 41, that is, one end of the notches 51, 52 is connected to each bottom wall portion 12.
It is better to reach the inner surface of 1,141.
In addition, regarding one of the deep main bodies 14, by providing a wide mouth portion 52a on the opening side of some of the notches, the notches themselves can be divided into chambers 101, 102, 103, It is used as a passageway to communicate between 104 and 104.

Now, the resin negative pressure tank 10 as described above is
It can be obtained by molding a pair of bodies 12 and 14, and then welding both bodies 12 and 14. During molding, especially the first ribs 21, 41,
Since the newly provided notches 51 and 52 are arranged intermittently, the influence of shrinkage deformation is alleviated, and no overall warping or the like occurs. Therefore, the pair of main bodies 12 and 14 can be welded together satisfactorily. This welding is performed, for example, on each main body 12,
This is done by placing the open side of the body 14 on a hot plate and then bringing the bodies 12 and 14 into close contact with each other.

In order to prevent deformation during molding, a rib may be separately provided on the outer surface of the main body 12 having a recess in the center.
For installation purposes, it can also be removed by cutting after molding.

Further, in the embodiment shown in the figure, a pair of main bodies 1
Notches 51 and 5 corresponding to each other in both 2 and 14
2 is provided, but the notch may be omitted, for example, on the side of the main body 12 having a shallow bottom.

(Effect of the invention) According to this invention, since the reinforcing ribs 21, 41 inside the main bodies 12, 14 are made into intermittent ribs by the notches 51, 52, warpage due to shrinkage deformation during molding is prevented. This problem can be solved and welding can be performed satisfactorily.

Moreover, the reinforcing ribs 21 and 4 of each main body 12 and 14
Since at least a portion of the reinforcing ribs 21 and 41 are welded together, the reinforcing function inherent to the reinforcing ribs 21 and 41 can be effectively exhibited.

[Brief explanation of drawings]

Figure 1 is a front view of one embodiment of this invention;
The figure is a partially cutaway side view, FIG. 3 is a sectional view taken along line - in FIG. 1, FIG. 4 is a sectional view taken along line - in FIG. 3, and
FIG. 5 is a sectional view taken along the - line in FIG. 1. 10... Resin negative pressure tank, 12, 14... Main body, 121, 141... Bottom wall, 122, 142
... Side wall portion, 21, 41 ... First rib, 22,
42...Second rib, 51, 52...Notch.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A negative pressure resin tank formed by welding together a pair of bodies each having a welded portion on the peripheral edge of the opening, and each body having a reinforcing rib inside,
The reinforcing ribs are intermittent ribs formed by notches, and at least a portion of the reinforcing ribs of each main body are welded together to form a negative pressure tank made of resin. 2. Each of the pair of main bodies includes a bottom wall portion that defines the planar shape of each main body, and a side wall portion that connects to the bottom wall portion at one end and has a welded portion at the other end, and also includes each reinforcement. The rib includes a first rib that extends across each body from one inner surface to the other inner surface of the side wall portion, and a second rib that intersects the first rib, and the first rib stands on the inner surface of the bottom wall of each main body, and has a welded part at the end on the opening side, and further, the notch divides the welded part in the first rib on one side, and the welded part in the first rib on the other hand. The resin negative pressure tank according to claim 1, wherein the negative pressure tank itself is divided.