JPH0667829U - diesel engine - Google Patents

Abstract

(57) [Abstract] [Objective] To reduce the number of parts and the assembly process by reducing the noise generated from the fuel injection device without attaching a sound insulating member such as a soundproof cover to reduce the manufacturing cost. To provide a diesel engine that can [Structure] Between the branch parts 5a of the intake manifold 5 in which the collecting part 5b at one end is connected to the intake pipe and the branch part 5a at the other end is connected to each intake port 4 of the engine 9, A partition wall 11 for connecting between the parts 5a is integrally provided with the intake manifold 5, and the intake manifold 5 provided with the partition wall 11 provides fuel injection devices 6, 7, 8 for supplying fuel to the engine 9. Covered to surround.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a diesel engine that reduces noise emitted from a fuel injection device such as a fuel injection pump, a fuel injection pipe, and a fuel injection nozzle.

[0002]

[Prior art]

 First, the outline of a conventional diesel engine will be described with reference to a sub-chamber type (vortex chamber type) diesel engine shown in FIG. A sub chamber 3 and an intake port 4 are formed in a cylinder head 2 attached to the cylinder block 1, and an intake manifold 5 is connected to the intake port 4. A fuel injection pump 6 is attached to the side surface of the cylinder block 1, and the other end of a fuel injection pipe 7 having one end connected to the fuel injection pump 6 is provided so as to face the sub chamber 3. It is connected to the fuel injection nozzle 8.

Further, intake air introduced into an intake pipe (not shown) is drawn into the cylinder 10 of the engine 9 through the intake manifold 5 and the intake port 4, while the fuel is pressurized by the fuel injection pump 6. Then, the fuel is injected from the fuel injection nozzle 8 into the sub chamber 3 through the fuel injection pipe 7. By the way, in recent years, exhaust gas regulations of diesel engines have been tightened, and reduction of smoke generation peculiar to diesel engines has been demanded. Therefore, in order to improve combustion, high-pressure injection of fuel has come to be used, and it has come to have a considerable effect.

[0004]

[Problems to be solved by the device]

 However, high-pressure injection of fuel was started, which resulted in another problem. That is, in a fuel injection device such as a fuel injection pump, a fuel injection pipe, a fuel injection nozzle, etc., high-pressure fuel is pressure-fed inside the fuel injection device with pressure fluctuations, which causes a large amount of noise.

Therefore, in order to reduce the noise from these fuel injection devices, conventionally, a noise insulating member such as a soundproof cover is attached to reduce the noise. However, mounting a sound insulating member such as a soundproof cover not only increases the number of engine components, but also increases the number of steps for assembling the sound insulating member, resulting in an increase in manufacturing cost. there were.

In view of the above problems, the present invention reduces the noise generated from the fuel injection device without installing a sound insulating member such as a soundproof cover, thereby reducing the number of parts and the assembly process. The purpose of the present invention is to provide a diesel engine that can reduce manufacturing costs.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the diesel engine of the present invention has a structure in which one end of the intake manifold is connected to an intake pipe, and the other end of the diesel engine is connected to each intake port of the engine. In addition, a partition wall connecting these branch parts is integrally provided with the intake manifold, and the intake manifold provided with this partition wall surrounds the fuel injection device for supplying fuel to the engine. It is a covered structure.

[0008]

[Work]

 Since the diesel engine of the present invention is provided with the partition wall, the partition wall and the intake manifold integrally formed with the partition wall reduce noise generated from the fuel injection device such as the fuel injection pump, the fuel injection pipe, and the fuel injection nozzle. The noise can be shielded and the noise emitted to the outside can be reduced.

Further, since it suffices to assemble the intake manifold to the engine without attaching a sound insulating member such as a soundproof cover, the number of parts and the assembly process can be reduced, and the manufacturing cost can be reduced.

[0010]

【Example】

 Next, an embodiment of the diesel engine of the present invention will be described with reference to the drawings. First, the first embodiment shown in FIGS. 1 and 2 is one in which the present invention is applied to a sub-chamber type (vortex chamber type) diesel engine in which two intake ports 4 are formed for each cylinder.

The intake port 4 is formed on the upper surface of the cylinder head 2 and closer to the center of the cylinder 10 than the fuel injection nozzle 8. The branch portion 5a of the intake manifold 5 connected to these intake ports 4 is A collecting portion 5b, which is provided so as to cover the fuel injection device including the fuel injection pump 6, the fuel injection pipe 7, the fuel injection nozzle 8 and the like from the outside, and where the branch portion 5a is assembled, is located below the fuel injection pump 6. It is arranged to do.

Further, a partition wall 11 integrally formed with the intake manifold 5 is provided between the branch portions 5 a of the intake manifold 5, and the partition wall 11 and the intake manifold 5 allow the fuel injection pump 6, Radiation noise generated from the fuel injection device such as the fuel injection pipe 7 and the fuel injection nozzle 8 is blocked. The components of the fuel injection system are the same as before, and the flow of intake air and fuel is the same as before.

According to the present embodiment, the sound insulation effect can be obtained only by assembling the intake manifold 5 integrated with the partition wall 11 into the engine 9 without attaching a sound insulation member such as a soundproof cover as before. The number of parts and the assembly process can be reduced. Next, a second embodiment shown in FIG. 3 is an intake manifold 5 which is integrated with a partition wall 11, and a branch portion 5a of the intake manifold 5 corresponding to both longitudinal end portions of an engine 9 (not shown) and a cylinder head 2. A partition wall 12 integral with the intake manifold 5 is also provided between the cylinder block 1 and the cylinder block 1.

By assembling this to the engine 9, the side surface of the engine 9 on which the fuel injection device such as the fuel injection pump 6, the fuel injection pipe 7, the fuel injection nozzle 8 is attached can be completely covered, Noise can be reliably blocked in all directions, including direction, left and right, and up and down. In this embodiment, the sound insulation is further enhanced by attaching a seal member made of an elastic member such as rubber between the partition wall 12 and the cylinder head 2 and between the partition wall 12 and the cylinder block 1. You can also

Next, in a third embodiment shown in FIG. 4, the intake manifold 5 in which the partition wall 11 is formed is divided into two parts laterally of the fuel injection pump 6 so that the upper part 5c can be detached from the lower part 5d. It is the one. In the present embodiment, by removing only the upper portion 5c of the intake manifold 5, the inspection and replacement work of the fuel injection nozzle 8 and the fuel injection pipe 7 can be simplified and the maintainability can be improved.

[0016]

[Effect of device]

 In the diesel engine of the present invention, one end of the intake manifold is connected to the intake pipe and the other end of the intake manifold is connected to the intake ports of the engine. A partition wall for connecting the two is integrally provided with the intake manifold, and the intake manifold provided with the partition wall covers the fuel injection device for supplying fuel to the engine, so that the following effects are achieved. be able to.

By providing the partition wall, noise generated from the fuel injection device such as the fuel injection pump, the fuel injection pipe, and the fuel injection nozzle is blocked by the partition wall and the intake manifold integrally formed with the partition wall. Therefore, the noise radiated to the outside can be reduced. Moreover, since it is sufficient to assemble the intake manifold to the engine without attaching a sound insulating member such as a soundproof cover, the number of parts and the assembly process can be reduced, and the manufacturing cost can be reduced. Further, since the intake pipe length can be increased, the inertial intake effect in the low / medium speed range can be obtained, and the torque in the low / medium speed range can be increased.

[Brief description of drawings]

FIG. 1 is a sectional view of a diesel engine according to a first embodiment of the present invention.

2 is a side view of the diesel engine of FIG. 1. FIG.

FIG. 3 is a perspective view of an intake system of a diesel engine according to a second embodiment of the present invention.

FIG. 4 is a sectional view of a diesel engine according to a third embodiment of the present invention.

FIG. 5 is a sectional view of a conventional diesel engine.

[Explanation of symbols]

4 Intake Port 5 Intake Manifold 5a Branch 5b Assembly 6 Fuel Injection Device (Fuel Injection Pump) 7 Fuel Injection Device (Fuel Injection Pipe) 8 Fuel Injection Device (Fuel Injection Nozzle) 9 Engine 11 Partition 12 Partition

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. An intake manifold, the one end of which is connected to an intake pipe and the other end of which is connected to each intake port of an engine. A diesel engine in which a partition wall to be connected is provided integrally with the intake manifold, and the intake manifold provided with the partition wall covers a fuel injection device for supplying fuel to the engine.