JPS6221500Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Application of the Invention) The present invention relates to a negative pressure tank for automobiles, and more specifically, it can be used as a negative pressure storage tank for various vacuum actuated devices for automobiles. be.

For example, devices equipped with negative pressure operating equipment such as automobile exhaust purification systems must always store and prepare a predetermined negative pressure for operation in a tank. Especially useful as a tank.

(Prior art and its problems) As an example of an operating negative pressure storage tank for vacuum operating equipment, one used for an exhaust purification system is
Disclosed in the "Toyota Crown Parts Catalog" published in November 1975. As is clear from this example,
The negative pressure storage tank itself is an independent cylinder type, and the tank itself is airtight. Therefore, when this tank is attached to a fixing member of the vehicle body, the side wall of the tank and the fixing member overlap to form a double structure, which increases the weight of the vehicle accordingly. This goes against the trend of reducing the weight of automobiles in order to save on fuel consumption, which has become a particular problem in recent years.

(Technical Problem to be Solved by the Present Invention) The technical problem to be solved by the present invention is to eliminate the problems of the prior art described above.

(Technical means of the present invention and its effects) In order to solve the above-mentioned technical problems, the present invention focuses on the use of a part of the tank and the fixing member on the vehicle body side, and uses a dome-shaped tank body. A technical means is used in which the flange portion of the opening edge is fixed to a cut-and-raised locking piece of the vehicle body via a seal to make the inside of the tank body airtight and create a negative pressure chamber. The adoption of this technical means means that the installation of the tank on the car body simultaneously constitutes the tank, eliminating the need for the double work of complete tank assembly and subsequent installation on the car body. It has the effect of making it easier.

(Embodiment) In the figure, reference numeral 1 denotes a part of an automobile body, for example, a fire board in front of the driver's seat, or a flat wall of a metal plate constituting a tire house as shown in the figure. This wall 1 is partially depressed to form a concave portion 2, and the circumference of the concave portion is cut and raised at intervals to form locking pieces 3. 4 is a dome-shaped tank body. The tank body 4 has a flange 5 at its peripheral edge, the periphery of the flange 5 is covered with a seal 6, and the flange 5 is sealed with a locking piece 3 through the seal 6 as shown in the figure, and is connected to the wall 1 and connected to the wall 1. It constitutes a pressure tank T. The engagement of the locking piece 3 and the seal 6 forces the annular seal 6 against the flat wall 1 around the concave portion 2, thereby making the inside and outside of the tank body 4 airtight. 7 is an input port, and 8 is an output port. 9 is a check valve.

Input port 7 is connected to a negative pressure source, such as an automobile engine intake manifold, and output port 8
communicates with a negative pressure operating device, such as a control valve for an engine exhaust purification device. A check valve 9 is interposed between the input port 7 connected to the negative pressure source and the tank T, and when the negative pressure in the negative pressure tank T decreases, negative pressure is supplied to the negative pressure tank through this check valve. However, when the vacuum source (engine vacuum) is higher than the tank internal pressure, the check valve 9 is closed to prevent the tank internal pressure from decreasing.

(Effects) Since the present invention is as described above, it has the practical effect of saving materials and being cheaper compared to conventional ones because it responds to a part of the vehicle body that constitutes the negative pressure tank. There is.

Conventional tanks have a structure in which a bracket is fixed at a suitable location on the vehicle body, and the tank is attached to this bracket. Compared to conventional tanks, the tank of this invention has a vehicle body as part of its structure, so vibrations are small. This is advantageous in maintaining the airtightness of the seal portion, check valve portion, etc., and increasing the durability of each component.

In addition, when packing and shipping the proposed tank body, after putting a blind stopper on the output port, the seal is brought into contact with the inner surface of the box, and then the inside of the tank body is evacuated through the input port. This has the advantage of not requiring a vacuum inspection and providing means for preventing cargo from collapsing during transportation due to vacuum suction.

[Brief explanation of the drawing]

The figure shows a longitudinal cross-sectional view of the proposed tank. 1... Part of the wall of an automobile body, 2... Recessed part,
3... Locking piece, 4... Tank body, 6... Seal, 7... Input port, 8... Output port.

Claims (1)

[Scope of utility model registration request] A dome-shaped tank body having an output port and an input port with a check valve, a locking piece provided on a wall portion constituting a part of an automobile body, a flange portion on an opening edge of the dome-shaped tank body, and the locking piece. A negative pressure tank for an automobile, comprising a seal disposed between the tank body and the wall portion to airtightly connect the two, the tank body and the wall portion forming a negative pressure chamber.