JPH04325316A - Fuel tank - Google Patents

Abstract

PURPOSE:To provide a fuel tank efficiently fitted with a pressure sensor measuring the internal pressure of a fuel tank main body. CONSTITUTION:A pressure sensor 28 is provided on a plate 14 provided with either one or both of a fuel pump 16 and a float measuring the fuel level and fitted to a fuel tank main body 11. The fitting work of the pressure sensor 28 is made very easy, no pressure guide tube is required, and a fuel tank having the pressure sensor 28 with very high productivity can be provided.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel tank, and more particularly to a fuel tank capable of detecting pressure fluctuations in a fuel system in an engine such as an automobile.

0002

2. Description of the Related Art FIG. 6 is a diagram for explaining the engine peripheral piping route shown in, for example, Japanese Utility Model Publication No. 62-3611.
1 is the engine body, 2 is an intake pipe that brings intake air into the engine, 3 is a supercharger, 4 is a pressure sensor that measures the intake negative pressure in the intake pipe 2, and 5 is a pressure sensor that connects the pressure sensor 4 to the intake pipe 2. A tube for introducing negative intake pressure is shown, and each end of the tube 5 is tightly inserted and connected to the port 2a of the intake pipe 2 and the nipple 4a of the pressure sensor 4 to prevent pressure leakage.

[0003] Conventionally, a pressure sensor is generally used as a peripheral device for an engine to measure intake negative pressure, and the intake negative pressure measured by this pressure sensor 4 is transmitted by an electrical signal. The data is supplied to a computer unit 6 mounted on the vehicle and processed.

0004

[Problem to be Solved by the Invention] As described above, the pressure sensor 4 that detects the intake negative pressure of the engine is fixed at a suitable location on the vehicle body, and the pressure sensor 4 is fixed at a suitable location on the body of the automobile. It was used tied with tube 5. By the way, in recent years, unburned fuel (
Emission regulations for raw gas (raw gas) have begun to be considered, and there is an urgent need to develop means to prevent raw gas from being emitted. In this raw gas emission prevention means, it is necessary to constantly measure the internal pressure of the fuel tank, and therefore, the pressure sensor for this purpose is installed at an appropriate location on the vehicle body near the fuel tank, similar to the case of measuring the intake negative pressure described above. Consideration has been given to a configuration in which a receiving seat is provided and fixed, one end of a pressure derivation tube is connected to the fuel tank, and the other end is connected to a nipple of a pressure sensor. However, the area around the fuel tank is usually very narrow, and installing a pressure sensor in such a location poses a problem in that assembly work becomes difficult.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fuel tank equipped with a pressure sensor for measuring the internal pressure of the fuel tank.

[0006]

[Means for Solving the Problems] The present invention includes a plate that is equipped with either or both of a fuel pump and a float that measures the fuel level and that is attached to a fuel tank body, and a plate that is installed on the plate and is equipped with a float that measures the fuel level. It is configured to include a pressure sensor that measures the internal pressure of the tank.

[0007]

[Operation] According to the fuel tank of the present invention, a plate equipped with a fuel pump, a float for measuring the fuel level, or both is attached to the fuel tank body.
This plate is used as a mounting plate for the pressure sensor, and the pressure inside the fuel tank can be directly detected without the need for a pressure lead-out pipe.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a fuel tank according to an embodiment of the present invention will be described in more detail with reference to the embodiment shown in the drawings. Figure 1
1 shows a fuel tank 10 according to an embodiment of the present invention. This fuel tank 10 includes a fuel tank body 11 that accommodates fuel, and a plate 14 that is fixed to the fuel tank body 11 with a gasket 13 interposed therebetween so as to close an opening 12 formed in the fuel tank body 11. Equipped with A support 15 is attached to the lower surface of this plate 14 as shown in FIG. 2, and a fuel pump 16 is fixed to this support 15 with a binder 17. Reference numeral 18 indicates a filter attached to the suction port of the fuel pump 16.

As shown in FIG. 1, another set of plates 14 to which such a fuel pump 16 is attached is attached to the fuel tank body 11 as a spare, and is used when the main fuel pump 16 breaks down. It looks like this. A fuel pipe 19 connected to the fuel supply port of the fuel pump 16 is pulled out from this plate 14 and fixed by welding or the like, and a return pipe for returning liquefied and unburned gasoline to the fuel tank body 11 is also attached to the plate 14. 20 is also attached in the same way.

A liquid level detection unit 21 is attached to the lower surface of the plate 14, and the liquid level detection unit 21 is connected by a connecting rod 23 to a float 22 that moves up and down as the liquid level moves up and down. , the liquid level is converted into a resistance value by a sliding resistor included in the liquid level detection unit 21 and output. Further, a lower limit level detection sensor 24 is suspended by a support rod 25 using a holder that attaches the liquid level detection unit 21 to the lower surface of the plate 14 .
electrically connected to.

The sliding resistance signal of the liquid level detected by the liquid level detection unit 21 due to the vertical movement of the float 22 and the liquid level lower limit level display signal detected by the above-mentioned unit 21 by the sensor 24 are transmitted to the plate 14. The terminal 2
The signal is sent to a signal processing device (for example, a car-mounted computer) (not shown) through a lead wire 27 connected to the terminal 6.

Since the plate 14 functions as a mounting support plate for the means for supplying fuel and the means for transmitting various information related to fuel, it is formed with flat surfaces on the front and back. A pressure sensor 28 is attached to the fuel tank body 11 to detect the pressure inside the fuel tank body 11 using its flat surface. When attaching the pressure sensor 28 to the plate 14, a receiving seat 29 is fitted into an opening formed in the plate 14 from the lower surface of the plate, and its periphery is fixed to the plate 14 by welding or the like. A through hole 30 is formed at the center of the receiving seat 29, and the nipple 28a of the pressure sensor 28 is screwed into the through hole 30 from the surface side of the plate 14 using the inner peripheral thread of the through hole 30. together with the plate 1
4 Attached to the surface.

As a result, the nipple 28 of the pressure sensor 28
The pressure introduction path 28b formed at a directly faces the inside of the fuel tank body 11. This pressure sensor 28
Since this device itself is well known, a description of the internal configuration will be omitted. One end of a lead wire 31 is connected to the pressure sensor 28, and the other end of this lead wire 31 is connected to the aforementioned lead wire 27.
and are connected to a signal processing device.

According to the fuel tank 10 according to the above-described embodiment configured in this manner, the pressure sensor 28 is mounted on the flat plate 14 for mounting and supporting the fuel supply-related devices attached to the fuel tank body 11. Since the pressure introduction passage 28b is connected directly to the inside of the fuel tank body 11, installation of the pressure sensor 28 is extremely easy, and there is no need for a pressure introduction tube, etc. It has great advantages in terms of assembly.

Next, FIG. 4 shows a plate 40 attached to the fuel tank body in a fuel tank according to another embodiment of the present invention. Similar to the embodiment shown in FIG. 2, this plate 40 also supports a fuel pump 16, a liquid level detection unit 21, a liquid level lower limit detection sensor 24, etc., and also supports a fuel pipe 19 and a return pipe 2.
0 is attached and a terminal 26 is placed and fixed on its surface. A pressure sensor 41 of a different configuration is attached to this plate 40 to detect the pressure inside the fuel tank body. Although the pressure sensor 28 shown in FIG. 3 is of a stand type, the pressure sensor 41 has a housing 41c in which a metal or molded nipple 31b is provided in a molded case 41a, as shown in FIG. The housing 31c is configured such that a sensing element having a sensor function, a hybrid IC, etc. are housed inside the housing 31c. This pressure sensor 41
A corresponding receiving seat 42 is attached to the plate 40 by using the flat rear surface of the plate 40 in the same manner as in the embodiment shown in FIG.

With such a fuel tank, the pressure sensor 41 is connected to the fuel pump 16 supported by the plate 40.
By installing it together with various related parts,
The installation can be facilitated and the workability of the installation can be improved.

[0017]

[Effects of the Invention] As explained above, according to the present invention,
By attaching the pressure sensor that detects the pressure inside the fuel tank body to the plate that is originally used to support the fuel pump, the float that measures the fuel level, or both, the work of installing the pressure sensor is extremely easy. At the same time, the pressure introduction passage can be connected directly into the fuel tank body, which eliminates the need for tubes, etc., and the pressure detection signal lead wire can be routed together with other equipment lead wires to a designated location. , it is possible to provide a fuel tank with a pressure sensor that is extremely easy to assemble and has high productivity.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a fuel tank according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a plate constituting the fuel tank shown in FIG. 1 and equipment such as a fuel pump attached to the plate.

FIG. 3 is a sectional view showing a pressure sensor attached to a plate.

FIG. 4 is a perspective view showing a plate in a fuel tank, a fuel pump, etc. installed on the plate according to another embodiment of the present invention.

FIG. 5 is a cross-sectional view of a pressure sensor attached to the plate shown in FIG. 4;

FIG. 6 is a configuration explanatory diagram schematically showing the arrangement of peripheral devices of an internal combustion engine in the related art.

[Explanation of symbols]

10 Fuel tank 11 Fuel tank body 12 Opening 14 Plate 16 Fuel pump 19 Fuel pipe 28 Pressure sensor

Claims (1)

[Claims] 1. A plate that is equipped with either or both of a fuel pump and a float that measures the fuel level and is attached to a fuel tank body, and a pressure sensor that is installed on the plate and measures the internal pressure of the fuel tank. and a fuel tank.