JPH0514552U - Fuel piping system for horizontal V-type engine - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the output, fuel consumption and service life of a horizontal V-type engine. [Composition] The fuel pressure-fed from the fuel tank flows into the rear delivery pipe 15 from the fuel inlet nozzle of the rear delivery pipe 15 and is heated, and the heated fuel is rear delivery pipe 15 and front delivery pipe 13 It is guided to the front delivery pipe 13 through the hose 10 connecting with. In this way, the rear delivery pipe 15
The temperature of the fuel supplied to the front bank 12 and the rear bank 14 is made substantially uniform by guiding the temperature to the front delivery pipe 13 after raising the temperature of the fuel. As a result, the combustion state of the front bank 12 and the rear bank 14 is made uniform, and the output of the engine and the fuel consumption are improved, and
The wear of each piston is also averaged out to extend the service life of the engine.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 In the present invention, the temperature of the fuel supplied to the front bank and the rear bank of the horizontal V-type engine is made substantially uniform to improve the engine performance and the wear of the pistons of both banks is made substantially uniform. The present invention relates to a fuel piping device for a stationary V-type engine.

[0002]

[Prior Art]

 The volume of fuel expands in proportion to the temperature of the fuel. On the other hand, the amount of fuel injected from the injector into the manifold is uniquely determined by the cross-sectional area of the injector outlet. Therefore, when comparing a fuel with a high temperature and a fuel with a low temperature, even if the volume of the fuel injected from the injector is the same, the volume of the fuel with a high temperature is expanding, so the fuel with a high temperature is expanded. The specific gravity and the amount of heat of the fuel have a lower value than the fuel having a lower temperature, and the fuel having a higher temperature is leaner than the fuel having a lower temperature in terms of the air-fuel ratio.

Therefore, the temperature of the fuel supplied to the engine affects the combustion state of the engine. When the combustion state changes due to the influence of the fuel temperature, the engine output and fuel consumption are affected, and this combustion change also affects the wear of the piston. For this reason, it is desirable that the temperature of the fuel be constant for each engine cylinder.

As shown in FIG. 5, in the conventional fuel piping, the fuel stored in the fuel tank 1 is pressure-fed in the fuel supply pipe 3 by the fuel supply pump 2 and is supplied to the engine 5 via the filter 4. Is piped to. The pressure of the fuel is adjusted to a constant value by the pressure regulator 6, and excess fuel is returned to the fuel tank 1 through the return pipe 7.

3 and 4 show the engine and its surroundings in more detail, the fuel introduced from the fuel supply pipe 3 to the filter 4 to remove the contaminants in the fuel is passed through the hose 8 to the V The fuel is supplied to the engine by being guided to the front delivery pipe 9 provided in the vicinity of the front bank of the V-type engine, and the rear delivery pipe 11 provided in the vicinity of the rear bank of the V-type engine through the hose 10 Is also led to be supplied into the engine. The pressure of the fuel supplied to the engine is adjusted to a constant level by the pressure regulator 6 provided at the fuel outlet of the rear delivery pipe 11, and excess fuel is returned to the fuel tank 1 through the return pipe 7. Has become.

[0006]

[Problems to be solved by the device]

 In the above-mentioned conventional example, the fuel supply path was made to flow to the rear delivery pipe via the front delivery pipe, so there is a point to be further improved for the following reasons. In other words, in a horizontal V-type engine, the rear bank is located behind the front bank, so the front bank is cooled by the wind and cooling fan while the vehicle is running, but the rear bank is Because it is blocked, the ratio of being cooled by the running air and the cooling fan is smaller than that of the front bank. Therefore, the rear bank becomes hotter than the front bank.

Therefore, when the fuel supply path is made to flow to the rear delivery pipe via the front delivery pipe, the temperature of the fuel is low on the front delivery pipe side and heat is radiated from the high temperature on the rear delivery pipe side from the rear bank. The temperature rises and becomes higher. In this way, when the temperature of the fuel supplied to the front bank side differs from the temperature of the fuel supplied to the rear bank side, the fuel supplied to the front bank side and the fuel supplied to the rear bank side are Differences in specific gravity and calorific value cause different air-fuel ratios, resulting in different combustion states on the front bank side and the rear bank side.

When the combustion state on the front bank side is different from that on the rear bank side as described above, it becomes difficult to control the combustion of the entire engine, and it is necessary to maintain an optimal engine combustion state in a strict sense. In some cases, the engine output may be reduced, or the fuel efficiency may be reduced. In addition, if the combustion conditions on the front bank side and the rear bank side are different, the piston wear rate will also be different on the front bank side and the rear bank side, and as a result, the engine with the most worn piston will be the whole engine. There is a problem that the service life of is determined.

The present invention provides a fuel piping device for a horizontal V-type engine that solves the above problems by reducing the temperature difference between the fuel supplied to the front bank side and the rear bank side of the horizontal V-type engine. is there.

[0010]

[Means for Solving the Problems]

 Means for solving the above problem is to provide a front delivery pipe in the vicinity of a front bank of a V-type engine and a rear delivery pipe in the vicinity of a rear bank in a fuel distribution device for a horizontal V-type engine. The rear delivery pipe is provided with a fuel inlet nozzle, the fuel outlet side of the rear delivery pipe and the fuel inlet side of the front delivery pipe are connected by a hose, and a pressure regulator is provided at the fuel outlet side of the front delivery pipe. And a fuel return hose connected to the pressure regulator.

[0011]

[Action]

 Since the present invention is configured in this way, the fuel having a low temperature, which has been pumped by the fuel pump, flows into the rear delivery pipe on the rear bank side having a high temperature to raise the temperature. This temperature rise is done in proportion to the temperature difference between the low temperature fuel and the high temperature rear delivery pipe. The fuel whose temperature has been raised in this way continues to flow into the cold front delivery pipe. Since the heat exchange between the fuel and the front delivery pipe in this front delivery pipe is performed by the temperature difference between the temperature of the fuel heated in the rear delivery pipe and the temperature of the front delivery pipe, The smaller the temperature difference between the two by raising the temperature of the fuel by the rear delivery pipe, the smaller the temperature difference of the fuel supplied to the front bank side and the rear bank side.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, a front delivery pipe 13 is provided near a front bank 12 of a horizontally arranged V-type engine, while a rear delivery pipe 15 is provided near a rear bank 14. The fuel supply hose 3 is connected to the fuel inlet of the rear delivery pipe 15, and the fuel outlet side of the rear delivery pipe 15 and the fuel inlet side of the front delivery pipe 13 are connected by a hose 10. A pressure regulator 6 is provided on the fuel outlet side of the front delivery pipe 13, and a fuel return pipe 7 is connected to the pressure regulator 6. In the figure, 16 is an exhaust manifold, 17 is a crank angle sensor, 18 is a throttle body, 19 is a cooling water inlet pipe, 20 is a cooling water outlet pipe, 21 is an exhaust manifold, 22 is an air compressor, 23 is an alternator, and 24 is Power steering pump, 25 is an intake manifold.

The operation of the present embodiment thus configured will be described below. In FIG. 2, reference numeral 26 is a front wheel, and when the vehicle 27 is traveling, the engine is cooled by the traveling wind indicated by the arrow A. Although not shown, the cooling fan provided on the front side of the engine also cools the engine. In such engine air cooling, the front bank 12 side is sufficiently cooled by the running air and the cooling fan, but the rear bank 14 side is blocked by the front bank 12, so it is cooled as much as the front bank 12. Absent. Therefore, the rear bank 14 is hotter than the front bank 12.

Therefore, the fuel whose temperature is still low, which has been pumped by the fuel pump 2 (see FIG. 5), flows from the fuel supply pipe 3 into the rear delivery pipe 15 on the side of the rear bank 14 having a high temperature and is heated. This temperature increase is proportional to the temperature difference between the fuel having a low temperature and the rear delivery pipe 15 having a high temperature. The fuel thus heated is supplied into the cylinder on the side of the rear bank 14, passes through the hose 10, and then flows into the front delivery pipe 13 having a low temperature.

The transfer of heat between the fuel in the front delivery pipe 13 and the front delivery pipe 13 is performed by the temperature between the temperature of the fuel heated in the rear delivery pipe 15 and the temperature of the front delivery pipe 13. Since it is carried out by the difference, in order to reduce the difference between the temperature of the fuel supplied to the front bank 12 and the temperature of the fuel supplied to the rear bank 14, the temperature of the front delivery pipe 13 should be close to that of the front delivery pipe 13 with the rear delivery pipe 15. The temperature of the fuel supplied to the rear bank 14 side is maintained as it is by increasing the temperature of the fuel to a high temperature to reduce the temperature difference between the two and suppressing the transfer of heat between the two. By thus raising the temperature of the fuel in the rear delivery pipe 15, it is possible to reduce the temperature difference between the fuel supplied to the front bank 12 side and the fuel supplied to the rear bank 14 side.

By reducing the temperature difference of the fuel supplied to the front bank 12 side and the rear bank 14 side in this way, the specific gravity and heat quantity of the fuel supplied to both banks are made substantially uniform, and engine control is performed. The combustion becomes easier and more optimal combustion can be performed, and the combustion states in both banks are made substantially uniform, so that the wear of each piston is averaged.

[0017]

[Effect of the device]

 As described in detail above, according to the present invention, the fuel from the fuel tank is heated in the rear bank and then supplied to the front bank, so that the temperature of the fuel supplied to both banks is made substantially uniform. You can As a result, the combustion state in both banks is made uniform, engine output and fuel consumption are improved, and piston wear is averaged, so that the service life of the engine can be improved.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a plan view showing a main part in an engine room equipped with the piping device shown in FIG.

FIG. 3 is a perspective view of a conventional example.

FIG. 4 is an assembly exploded perspective view of a conventional delivery pipe.

FIG. 5 is a perspective view showing an entire conventional fuel piping system.

[Explanation of sign]

 3 Fuel supply pipe 6 Pressure regulator 7 Fuel return pipe 10 Hose 12 Front bank 13 Front delivery pipe 14 Rear bank 15 Rear delivery pipe

Claims (1)

[Scope of utility model registration request] 1. In a fuel piping system for a horizontal V-type engine, a front delivery pipe is provided in the vicinity of a front bank of the V-type engine, a rear delivery pipe is provided in the vicinity of a rear bank, and a fuel inlet nozzle is provided in the rear delivery pipe. And a fuel outlet side of the rear delivery pipe and a fuel inlet side of the front delivery pipe are connected with a hose, a pressure regulator is provided on the fuel outlet side of the front delivery pipe, and a fuel return hose is connected to the pressure regulator. A fuel piping device for a horizontal V-type engine, which is characterized in that