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Fuel supply device

A fuel supply device and fuel technology, which can be applied to combustion engines, internal combustion piston engines, liquid variable capacity machines, etc., can solve the problems of increasing fuel pressure loss and reducing volumetric efficiency, and achieve the goal of reducing pressure loss and high volumetric efficiency. Effect

Inactive Publication Date: 2015-07-22
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in the case of using this device, for the discharge of steam, if the fuel pump is used in a higher temperature environment, in order to increase the compression ratio of the fuel, it is necessary to reduce the height of the suction passage to reduce the suction from the cylinder. The volume of the suction passage between the hole and the cylinder bore, but when the height of the suction passage is reduced, there is a problem that the pressure loss of the fuel increases and the volumetric efficiency decreases.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0071] figure 1 It is a figure which shows the fuel supply system which has the fuel supply apparatus 3 which concerns on Embodiment 1 of this invention, figure 2 yes means figure 1 A cross-sectional view of the fuel supply device 3, image 3 Yes figure 2 The enlarged view of the main part, Figure 4 is along image 3 The sectional view of IV-IV.

[0072] The fuel supply system includes: a fuel tank 1; a fuel supply device 3, which is connected to the fuel tank 1 outside the fuel tank 1 via a low-pressure pipe 2 and has a built-in fuel pressure regulator 7; a fuel injection device 5, which The fuel injection device 5 is connected to the fuel supply device 3 via the high-pressure pipe 4 and injects fuel supplied from the fuel supply device 3 ; and the communication pipe 6 connects the fuel pressure regulator 7 and the fuel tank 1 .

[0073] When the difference between the fuel pressure in the high-pressure pipe 4 and the fuel pressure in the fuel tank 1 is larger than t...

Embodiment approach 2

[0137] Figure 9 is a sectional view of main parts showing the fuel supply device 3 according to Embodiment 2 of the present invention, Figure 10 It is a front view showing the cylinder bore 21 of the cylinder block 24 .

[0138] In this embodiment, the notch portion 34 is formed so as to be connected to the tapered portion 35 which is a chamfer formed at the edge portion of the cylinder bore 21 of the cylinder block 24 .

[0139] The boundary portion 36 where the notch portion 34 intersects the tapered portion 35 is located outside the sliding range of the piston 22 .

[0140] The other structures are the same as those of the fuel supply device 3 in the first embodiment.

[0141] In the case of cutting the cylinder 24 , burrs and burrs are generated on the boundary portion 36 , and the burrs and burrs may damage the piston 22 when the piston reciprocates. When it is desired to completely remove the burrs and burrs generated on the boundary portion 36, a deburring process ...

Embodiment approach 3

[0144] Figure 11 is a sectional view showing the fuel supply device 3 according to Embodiment 3 of the present invention, Figure 12 Yes Figure 11 The enlarged view of the main part, Figure 13 is along Figure 12 The cross-sectional view of XIII-XIII.

[0145] In this embodiment, an arc-shaped notch 34 is formed on the edge of the discharge hole 26 of the valve plate 25 on the suction passage 29 side.

[0146] The starting point D of the notch 34 is a portion facing the portion between the suction hole 23 and the opening of the cylinder bore 21 , and the notch 34 inclined from the starting point D is connected to the discharge hole 26 .

[0147] Other structures are the same as those of the fuel supply device 3 in Embodiments 1 and 2.

[0148] In this embodiment, the pressure loss of the fuel increases from the suction hole 23 into the suction passage 29 with a small effective cross-sectional area of ​​the flow passage. The cutout portion 34 enlarges the cross-section...

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Abstract

The present invention provides a fuel supply device which can reduce pressure loss of a fuel in a suction passageway under the condition of ensuring a specified compression ratio and can ensure a high volume efficiency even under much more severe using conditions. According to the fuel supply device, a notch portion (34) is formed on the end face of a cylinder body (24) and is obliquely connected to a cylinder chamber (21) using the position between opening parts of a suction hole (23) and the cylinder chamber (21) as a starting point (D), and a flow path sectional area of the suction passageway (29) is increased at the notch portion (34).

Description

technical field [0001] The present invention relates to a fuel supply device for supplying fuel in a fuel tank to a fuel injection device through reciprocating motion of a piston. Background technique [0002] Due to environmental problems such as global warming, restrictions on fuel consumption and exhaust gas of gasoline engines have become strict. In recent years, small displacement engines such as small two-wheeled vehicles have also been restricted. Against this background, the fuel supply system for supplying fuel to the engines of four-wheeled vehicles and two-wheeled vehicles has been replaced by a system using a carburetor. Conventional mechanical fuel supply systems require electronic control, that is, FI (Fuel Injection) for the purpose of reducing fuel consumption of the engine and cleaning exhaust gas. [0003] In automobiles, medium and large two-wheeled vehicles, etc., a built-in fuel supply device provided in a fuel tank is used. However, in the case of usi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04B1/12
CPCY02T10/123Y02T10/12
Inventor 下村启介瓜生拓也大西善彦
Owner MITSUBISHI ELECTRIC CORP