JPH0535270B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to fuel tanks mounted on various vehicles, and more particularly to a feed pump mounting structure for an in-tank pump type fuel tank in which the feed pump is disposed within the tank body.

2. Prior Art FIG. 2 shows a conventional structure, in which 1 is a tank body, 6 is a feed pump disposed inside the tank body 1, and this feed pump 6 is a workpiece formed on the upper wall 2 of the tank body 1. It is suspended and fixed to a stay 7 fixed to the back surface of a lid 5 that closes the hole 4. 8 is the inlet 6a at the lower end of the feed pump 6
This is a filter unit attached to the filter unit, which consists of a suction passage 9 extending laterally and a filter 11 that covers the suction port 10 at the tip of the suction passage 9.The filter unit passes the fuel through the filter 11, and then pumps the fuel by the feed pump 6 (not shown). It is designed to lead out to the fuel supply system. The feed pump 6 bottoms out against the bottom wall 3 of the tank body 1 via a vibration isolating rubber 14, and the suction port 10 of the filter unit 8 is brought as close to the tank body 1 and the bottom wall 3 as possible to drain the remaining fuel in the tank body 1. It is designed so that it can be reduced. This similar structure is, for example,
It is shown in Japanese Utility Model Application No. 56-117053 and Japanese Utility Model Application Publication No. 56-117048.

Problems to be Solved by the Invention Since the feed pump 6 bottoms out against the bottom wall 3 of the tank body 1, even if the vibration isolating rubber 14 is provided at the lower end of the feed pump 6, the The vibrations are directly transmitted to the bottom wall 3 of the tank body 1 and become a major cause of noise. In addition, if the bottom wall 3 of the tank body 1 is deformed due to road surface interference or tank internal pressure fluctuations, the feed pump 6 will be pushed up, deforming or damaging not only the feed pump 6 itself but also various feed pump attachment parts, which will impede proper fuel supply. There is a problem where this occurs.

Therefore, the present invention has developed a fuel pump that prevents the drive vibration of the feed pump from being transmitted to the bottom wall of the tank body, and that also avoids the phenomenon of the feed pump pushing up even if the bottom wall of the tank body is deformed due to road surface interference or tank internal pressure fluctuations. This provides a tank feed pump mounting structure.

Means for Solving the Problem A flexible part is formed in the middle part of the suction passage of the filter unit attached to the inlet at the lower end of the feed pump, and the molded base and tip part of the suction passage are straddled over the flexible part. An elastic member is disposed across the tank body, and the suction port at the tip of the suction passage is biased downward together with a filter covering the suction port, so that the filter is elastically placed on the bottom wall of the tank body. Accordingly, the suction port is arranged close to the bottom wall of the tank body with reference to the bottom wall. On the other hand, the height of the feed pump itself from the bottom wall of the tank body to the bottom end where the filter unit is attached is greater than the maximum movement stroke of the filter from its normal position to a horizontal position approximately parallel to the bottom wall of the tank body. It is set and placed in a large size.

Function Since the suction port at the end of the suction passage of the filter unit is urged downward by an elastic member together with the filter, even if there is an installation error in the feed pump or a molding error in the tank body, the flexible part in the middle of the suction passage and It is absorbed by the flexural deformation of the elastic member,
Since the filter is always placed in elastic contact with the bottom wall of the tank body, the suction port can be placed close to the bottom wall of the tank body at a constant distance from the bottom wall, and the feed pump A required distance is ensured between the lower end of the tank and the bottom wall of the tank body.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings, in which the same parts as those of the conventional structure are denoted by the same reference numerals.

In FIG. 1, the feed pump 6 is suspended and fixed to a stay 7 fixed to the lower surface of a lid 5 that closes the working hole 4 in the upper wall 2 of the tank body 1, and the inlet 6a at the lower end of the feed pump 6 has the following points: The basic structure is the same as that of the prior art, including the attachment of a filter unit 8 consisting of a suction passage 9 and a filter 11 that covers a suction port 10 at the tip thereof.

Here, the suction passage 9 of the filter unit 8
A bellows-shaped flexible portion 12 is formed in the middle of the flexible portion 12, and the filter 11 is provided at the distal end portion of the flexible portion 12 to cover the suction port 10.
An elastic member, such as a leaf spring 13, is loaded between the molded base of the filter 11 and the back of the filter 11, and the suction port 10 is urged downward together with the filter 11, so that the lower edge of the tip of the filter 11 is pressed against the bottom edge of the tank body 1. It is fixed in elastic contact with the bottom wall 3. On the other hand, the feed pump 6 itself has a height dimension H from the bottom wall 3 of the tank body 1 to the lower end portion where the filter unit 8 of the feed pump 6 is attached, from the normal position of the filter 11 to approximately the bottom wall 3 of the tank body 1. The positions are set to be larger than the maximum movement stroke S to the parallel horizontal position.

According to the above embodiment structure, the suction port 10 at the tip of the suction passage 9 of the filter unit 8 is connected to the filter 11.
Since the leaf spring 13 is also biased downwardly, even if there is an installation error of the feed pump 6 or a molding error of the tank body 1, the flexible portion 12 at the middle of the suction passage 9 and the leaf spring 13 will bend and deform. The space between the suction port 10 and the bottom wall 3 of the tank body 1 can always be kept constant. It can be disposed close to the bottom wall 3, and the remaining fuel amount can be kept constant without causing variations in the remaining fuel amount for each tank body. In addition, since the height H of the lower end of the feed pump 6 from the tank body bottom wall 3 is set larger than the maximum movement stroke S of the filter 11, the tank body bottom wall may be damaged due to road surface interference or fluctuations in tank internal pressure. For example, even if the filter 11 is moved to a substantially horizontal position with the maximum movement stroke S as shown by the chain line in FIG. 3, a required gap δ is ensured. Therefore, the drive vibration of the feed pump 6 is transmitted to the bottom wall 3 of the tank body 1.
The feed pump 6 will not be pushed up and deformed or damaged.

Effects of the Invention As described above, according to the present invention, even if the installation error of the feed pump or the molding error of the tank body is somewhat large, the suction port of the fuel unit can be connected to the tank by the flexible portion of the suction passage and the elastic member. The tank can always be placed in a constant position close to the bottom wall of the main body with the bottom wall of the main body as a reference, so there is no variation in the amount of fuel remaining in each tank main body, and reliability is improved.
The sense of quality can be further improved. Moreover,
The height from the bottom wall of the tank body to the bottom end of the feed pump is set larger than the maximum travel stroke of the filter, so even if the bottom wall of the tank body is deformed due to road surface interference or tank internal pressure fluctuations, the bottom end of the feed pump A required gap can be secured between the tank body and the bottom wall of the tank body. Therefore, the vibration of the feed pump will not be transmitted to the bottom wall of the tank body and cause a large amount of noise, and the feed pump can be prevented from being pushed up, and the fuel supply function will not be impaired in any way, making it even more reliable. , which has a great practical effect of increasing the sense of quality.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG.
The figure is a sectional view showing a conventional structure. 1...Tank body, 2...Top wall, 3...Bottom wall,
6...Feed pump, 6a...Inlet, 7
... Stay, 8 ... Filter unit, 9 ... Suction passage, 10 ... Suction port, 11 ... Filter, 1
2...Flexible part, 13...Elastic member.

Claims (1)

[Claims] 1. A feed pump is suspended and fixed to a stay fixed to the upper wall side of the tank body, and a filter unit consisting of a suction passage extending laterally to the inlet at the lower end of the feed pump and a filter covering the suction port at the tip thereof is installed. In the attached structure, a flexible part is formed in the middle part of the suction passage, and an elastic member is disposed across the flexible part and between the molded base part and the tip part of the suction passage, and the suction opening is By urging the filter downward with an elastic member and fixing the filter in elastic contact with the bottom wall of the tank body,
While the suction port is located close to the bottom wall of the tank body with reference to the bottom wall, the height dimension from the bottom wall of the tank body to the lower end portion where the filter unit of the feed pump is attached is determined based on the normal position of the filter. A feed pump mounting structure for a fuel tank, characterized in that it is set larger than the maximum movement stroke from the point to a horizontal position substantially parallel to the bottom wall of the tank body.