JPS59176460A - Fuel pump - Google Patents

Abstract

PURPOSE:To improve efficiency and safety by integrally forming a cover on the outercircumference of synthetic resin of fuel pump except a gap for inserting a fuel hose thereby making withstandable against excessive moment. CONSTITUTION:Suction chamber 9 and delivery chamber 10 of synthetic resin is integrally formed with a tubular cover 11 concentrically over a suction hose connection port 7, delivery hose connection port 8 except a gap for inserting a fuel hose 12. Since the hose connection ports 7, 8 are made of synthetic resin, it has resiliency and recovery performance to be deformed only slightly upon application of moment, thereby it will hardly cause breaking or crack at the connection port resulting in improvement of pump efficiency and safety.

Description

[Detailed description of the invention] B. Industrial application fields The present invention relates to a fuel pump for an internal combustion engine.

In conventional fuel pumps, reinforcement of the synthetic resin hose connection port is usually done by attaching a number of ribs (1) at the base of the hose connection port as shown in Figure 1, or by attaching a number of ribs (1) as shown in Figure 2 to the base of the hose connection port. A large radius (2) is provided at the hose connection port, or the wall thickness of the hose connection port is increased to withstand the moment applied to the hose connection port.

In addition, in the case of a sheet metal fuel pump, the hose connection port is inserted from the root into the mounting hole narrowed inside a part of the pod (suction chamber or discharge chamber) together with the fuel pump to prevent cracks in the hose connection port. Utility Model Publication No. 773792, published in 1973, has a fuel hose attached so that even if cracks occur, there will be no fuel leakage.

However, for hoses with many lips at the hose connection port, if the length of the lips is shortened, it will not be able to withstand a large moment, and if the lips are made long, the length of the fuel hose to be inserted will not be enough. coming out. The same applies to hoses with a large radius at the base of the hose connection port.

If the wall thickness of the hose connection port is increased, the inner diameter will become smaller and the fuel flow resistance at the hose connection port will increase, reducing the efficiency of the fuel pump and causing problems such as engine malfunction and paper lock. In addition, in the case of a fuel pump made of sheet metal, although it is effective in preventing bending of the hose connection port, fuel leakage occurs if the fuel hose is torn due to a flying object hitting the fuel hose.

This is because an unfixed fuel hose will not crack even if a flying object hits it due to the freedom of the hose, but the fuel hose near the fuel pump is fixed to the pump, so it can be torn or punctured by a flying object. It gets hot.

In view of the above, an object of the present invention is to eliminate the above-mentioned drawbacks by providing a cover that covers the outer periphery of the hose connection port.

29. Constitution of the Invention In order to achieve the above object, the present invention provides hose connection ports (7) on the outer periphery of synthetic resin hose connection ports (7), (8).
), (8) cover 011. (111) is integrally formed with a gap through which a fuel hose can be inserted.

E. Embodiment FIG. 3 is a vertical sectional view of a fuel pump showing an embodiment of the present invention, in which (3) is an eccentric cam, (4) is a swinging arm, (5) is an operating transverse rod, and (6) is a swing arm. are a working membrane (9), a suction chamber and a discharge chamber made of αO synthetic resin, respectively; a suction hose connection port (7), a discharge hose connection port (8), and the hose connection port (7).

A cylindrical force is formed with a gap in which the fuel hose (c) can be inserted on the outer periphery of the concentric circle of (8)/<-Ql), αB
are integrally formed. α3.03 is a clip that fixes the fuel hoses (2), (2) to the hose connection ports (7), (8). Figure 3 is an enlarged longitudinal sectional view of the hose connection port shown in Figure 3. Figure S is its front view. The cover has a polygonal cylindrical shape (see figure 1).
The hose connection ports (7) and (8) may not be covered entirely, but may be partially covered (Fig. 7), or may be divided and covered in a fence shape (Figs. 3 and 7).

Now, as the eccentric cam (1) rotates, the cam (1)
) moves up and down and transmits its motion to the operating crossbar (3), and since the operating membrane (4) is fixed to the other end, it operates as the operating crossbar moves up and down. Membrane (4)
goes up and down. Due to this movement, fuel is sucked from the Fl fuel tank, enters the pump through the hose connection port (7), and is discharged into the carburetor through the hose connection port (6).

By the way, since the hose connection ports (7) and (8) are made of synthetic resin, they have elasticity and stability, and unlike metal hose connection ports, they do not bend or crack when force is applied. . Also a hose connection port (7).

(8) is connected and communicated with the fuel hose α by (2), and when a moment is applied to the fuel hose, the hose connection ports (7) and (8) and the fuel hose 02.0 are bent, and the cover ( Since the gap with (11) is small, the cover Ql) and the fuel hose (l), a2 are in contact with Qll and the cover, fuel hose, and hose connection port are integrated, so the hose connection port (7), The diameter of (8) is doubled or tripled and acts to support the moment applied to the hose connection ports (7) and (8). Also, the cover 01), (Ill is the hose connection port (7), (8) Since the diameter is thicker, it is less likely to deform even when a moment is applied.Furthermore, if there is a flying object on the fuel hose from the outside during a vehicle collision or during engine assembly, the part where the hose is not fixed can escape with the freedom of the hose, but the part fixed to the fuel pump can be protected with a cover〇υ,0〉) to prevent cracks and holes in the fuel hose.

Figures 2 to 3 show other embodiments of the present invention,
Figure 3 shows v! ! The covers 01) and α]) are divided into many pieces and formed into a fence shape so that the hoses 0 [F] and α can be clipped to the base of the hose connection ports (7) and (8). There is. Even in this case, the hose connection ports (7) and (8)
) is made of synthetic resin, so it has high elasticity and stability, and will not crack even with slight deformation. Therefore, partial cover 0
1) Even Qll deforms to some extent and withstands moment without cracking.

If the direction of the flying object is determined, the covers Ql) and (11) can be provided only in that direction, as shown in FIG. FIG. g shows the cover αn, On formed into a polygonal cylindrical shape.

Figure 7 shows a case where the cover α℃, 0]) is formed into a fence shape, and the length of the hose connection ports (7) and (8) can be shortened by clipping the cover (11) and Ql) from above. In addition, as with the embodiment shown in FIG. 6, it has elasticity and stability, so it can withstand moments.
Since it is clipped from above the ll+, it is even more effective in protecting the fuel hose from flying objects.

According to the present invention, when a moment is applied to the fuel hose, the hose connection port and the fuel hose are bent, and the fuel hose comes into contact with the cover, causing the cover, P hose connection port, and hose connection port to become negative. Even if the diameter of the hose connection port is small, by providing a cover, the actual diameter becomes thicker, so you can use even more force! (- means the outside diameter is thicker than the hose connection port, so there is a large moment K.
It has a structure that prevents bending and cracking of the hose connection port. Also, if there is a flying object on the fuel hose from the outside during a vehicle collision or during engine assembly, the part where the hose is not fixed can escape with its freedom, but the part fixed to the fuel pump cannot be covered. Protects the fuel hose from cracks, holes, etc.

Furthermore, since there is no need to provide a lip or B at the hose connection port, the hose insertion straight portion of the hose connection port can be made longer, improving sealing performance and eliminating fuel leakage.

In addition, as mentioned above, the cover, fuel hose, and hose connection port are all sharp and can withstand large moments, so the wall thickness of the hose connection port can be made thinner and the inner diameter can be increased, which reduces fuel flow resistance at the hose connection port and improves pump performance. We provide fuel pumps that are safe, reliable, high performance, and lightweight and inexpensive because they are made of synthetic resin, which can improve efficiency and prevent dangers such as vehicle fires due to fuel leakage. can.

[Brief explanation of the drawing]

Figures 1 and 2 are vertical cross-sectional views of conventional hose connection ports, and Figure 3 is a vertical cross-sectional view of a conventional hose connection port.
1 is an enlarged longitudinal sectional view of the hose connection port of the embodiment shown in FIG. 3, and FIG. S is a hose connection shown in FIG. Front view of the mouth,
Figures B to G are front views of hose connection ports showing other embodiments, and Figures 7(A),...) are longitudinal sectional views and front views of hose connection ports showing other embodiments. . (3) Eccentric cam (4) Swinging arm (5) - Operation side rod (6) - Operation model (7) Suction hose connection port (8) Discharge hose connection port (9)...Suction chamber αO...Discharge chamber circle...-Cover (2)...Fuel hose 03...Clip Patent applicant Aisan Kogyo Co., Ltd.

Claims (1)

[Claims] 1. A cover 01J that covers the outer periphery of the hose connection ports (7), (8) made of synthetic resin;
A fuel pump 1 characterized in that αD is integrally formed with a gap through which a fuel hose can be inserted. 2. The above cover circle, 011' is the hose connection port (7)
(8) The fuel pump according to claim 1, which is formed into a cylindrical shape over the entire outer circumference. 3. The above cover circle, 01) is connected to the hose connection port (7), (
8) The fuel pump according to claim 1, which is formed so as to cover a part of the entire outer circumference. 4. The above cover Ql), (11) is connected to the hose connection port (7).
), (8> The fuel pump according to claim 1, which is formed so as to divide the outer periphery into a fence shape.