JP2001020753A - Wire harness arrangement for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce costs without using brackets and protection members with high strength and rigidity. SOLUTION: In this engine, a fuel injection valve 20 is disposed at a portion facing an intake port 2b of a cylinder head 2, an intake manifold 6 is connected with the intake port 2b, a sound absorbing material 25 is disposed in a space between the fuel injection valve 20 and a connection portion with the intake manifold 6, and cover member 26 for press fixing the sound absorbing material 25 to the cylinder head 2 is fixed. In this case, a recess groove 25b are formed on the sound absorbing material 25 along the wiring route of a wire harness 28, and the wire harness 28 is disposed in the recess groove 25b while covered with cover member 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring harness wiring structure for supplying power to electric components provided in an engine.

[0002]

2. Description of the Related Art In general, a wire harness routed to an engine is formed by bundling a large number of electric wires for supplying electric components such as a fuel injection valve and a direct ignition device. Especially when the wiring harness is laid out around the engine, the length of the wiring harness tends to vary depending on the wiring route. Therefore, if the wiring harness is routed along the route, it may interfere with other parts or the temperature may increase due to engine heat and damage. Or may be done.

For this reason, conventionally, the wiring harness is fixed around the engine through a plurality of brackets and clamps to restrict the wiring route of the wiring harness, and the wiring harness is covered with a protective material to protect the engine heat and heat. They are protected from external forces. In this case, it is necessary to ensure the strength and rigidity of the bracket so that the wiring route of the wire harness can be maintained for a long time.

[0004]

However, in a structure in which the wire harness is fixed around the engine via a bracket or a clamp or covered with a protective material as in the above-described conventional art, a bracket or a protective material having high strength and rigidity is used. Need to be separately prepared, and there is a problem that the cost increases as the number of parts increases.

The present invention has been made in view of the above-mentioned conventional circumstances, and has as its object to provide a wiring harness wiring structure for an engine which does not require brackets and protective materials having high strength and rigidity and can reduce costs. I have.

[0006]

Means for Solving the Problems The present inventor has observed around an engine in which a wire harness is routed, and in an engine having a fuel injection valve, an engine intake sound and an opening / closing sound of the fuel injection valve are transmitted outside the vehicle. In order to suppress this, attention has been paid to the fact that the sound absorbing material is provided so as to fill a space between the intake manifold connection portion and the fuel injection valve, for example. The present invention was conceived of by making it possible to eliminate the need for the conventional bracket and protective material by providing the sound absorbing material with the function of fixing and protecting the wire harness.

Therefore, the present invention provides a fuel injection valve disposed at a portion facing an intake port of a cylinder head, connects an intake manifold to the intake port, and provides a fuel injection valve in a space between the fuel injection valve and an intake manifold connection portion. In an engine in which a sound absorbing material is provided and a cover member for pressing and fixing the sound absorbing material is fixed to the cylinder head, a concave groove is formed in the sound absorbing material so as to extend along a wiring path of a wire harness. The wire harness is arranged in the groove, and the wire harness is covered with the cover member.

[0008]

According to the wiring harness wiring structure of the present invention, a groove for accommodating the wiring harness is formed in the sound absorbing material provided between the fuel injection valve and the intake manifold connection. Since the wire harness is covered with the cover member, interference with other parts of the wire harness can be avoided by forming the concave groove of the sound absorbing material along the wiring path. Further, since the wire harness is covered by the sound absorbing material and the cover member, it can be protected from engine heat and external force.

In the present invention, the sound absorbing material for suppressing the transmission of noise to the outside of the vehicle and the cover member for pressing and fixing the sound absorbing material are provided with the function of fixing and protecting the wire harness. The wiring harness can be routed and fixed, and a conventionally required bracket and protective material having high strength and rigidity can be eliminated, and the number of parts can be reduced and the cost can be reduced.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 and 2 are views for explaining a wiring harness wiring structure of an engine according to an embodiment of the present invention, and FIG. 1 is a cross-sectional view of the engine with a wiring harness (I- in FIG. I line cross section), FIG.
FIG. 3 is a plan view of the engine in which a wire harness is routed.

In FIG. 1, reference numeral 1 denotes a four-stroke parallel four-cylinder engine. In the engine 1, a lower mating surface 3a of a head cover 3 is sealed on an upper mating surface 2a of a cylinder head 2 fastened to a cylinder block (not shown). 4 is a schematic structure fastened with bolts 5 with the interposition of a bolt 4.

The cylinder head 2 is formed with an intake port 2b communicating with a combustion recess (not shown) provided for each cylinder at the cylinder block side mating surface. Of the outer wall 2c. The downstream end port 6a of the intake manifold 6 communicating with the intake port 2b is connected to the outer wall 2c of the cylinder head 2. A throttle body common to each cylinder is connected upstream of each intake manifold 6.

The cylinder head 2 has an intake valve (not shown) for opening and closing an intake opening formed in the combustion recess.
The intake camshaft 11 is in contact with a valve lifter 9 of the intake valve with a rocker arm 10 interposed therebetween.
1 is supported by a bearing 12 formed on the mating surface between the cylinder head 2 and the head cover 3.

A spark plug (not shown) is mounted on a portion of the cylinder head 2 facing each combustion recess, and a direct ignition device 15 is connected to each spark plug. Each of the ignition devices 15 is fixed to an upper wall 3b of the head cover 3 by bolts 16. Reference numeral 17 denotes a cap for opening and closing the engine lubrication oil inlet.

An independent fuel injection valve 20 is mounted for each cylinder on a portion of the outer wall 2c of the cylinder head 2 facing each intake port 2b. Each fuel injection valve 20 is arranged above the downstream end port 6a of the intake manifold 6 so as to be inclined such that the injection port 20a is directed to the valve back portion of the intake valve.

A camshaft 1 is provided at the upper end of each fuel injection valve 20.
A single fuel rail 21 extending in parallel with 1 is provided, and a fuel pump, a fuel tank (not shown), and the like are connected to the fuel rail 21 via a fuel supply hose 22. The fuel rail 21 has a rectangular cylindrical shape, and a fuel injection valve 20 is provided in a concave portion 21 a formed in the fuel rail 21.
The upper end 20b is inserted, and fuel is supplied through a hole 21b formed in the bottom of the recess 21a. Support stays 23 are fixed to both ends of the fuel rail 21, and both support stays 23 are fixed to the boss 2e of the cylinder head 2 by bolts 24.

The fuel injection valve 20 and the intake manifold 6
A substantially prismatic sound absorbing material 25 is arranged between the connection portion and the space so as to fill the space therebetween. The sound absorbing material 25 is made of urethane foam having heat insulation, abrasion resistance and elasticity.
This is for suppressing the engine intake sound, the opening / closing sound of the fuel injection valve 20, and the like from resonating in the space and transmitted outside the vehicle. The sound absorbing material 25 is disposed substantially in parallel with the fuel rail 21 over substantially the entire length of the cylinder head 2. On the lower surface of the sound absorbing material 25, a semicircular concave portion 25a surrounding the upper wall portion of each intake manifold 6 is cut out.
The notch concave portion 25a is provided with a margin for clamping each manifold 6 when pushed between the ports of each intake manifold 6.

A cover member 26 is disposed above the sound absorbing member 25, and covers the fuel injection valve 20, the fuel rail 21, and the sound absorbing member 25 with the cover member 26. The cover member 26 has a substantially rectangular plate shape, and three attachment portions 26a are formed on an inner edge portion 26b of the cover member 26. Each of the attachment portions 26a is attached to a rib portion 3d formed on the head cover 3. It is fixed by bolts 27. Also, the rear edge 26 of the cover member 26
“c” is free with a slight gap between it and the intake manifold 6, and the sound absorbing material 25 is pressed and fixed by the cover member 26.

The sound absorbing member 25 is provided with a concave groove 25b extending linearly along the fuel rail 21. The concave groove 25b is formed in a U-shape with a deep bottom, and a wire harness 28 is arranged in the concave groove 25b. The wire harness 28 is formed by bundling a large number of electric wires and corrugating an insulating tape around the outer periphery of each of the electric wires. It is connected to the connector 29 of the valve 20. Here, the concave groove 25b is not limited to a linear shape, but may be formed in a curved shape, for example, and may be formed in accordance with the wiring route of the wire harness 28.

When the cover member 26 presses the sound absorbing material 25, the wire harness 28
5, and is fixed by the concave groove 25b.
5, is surrounded by the cover member 26. Thus, the sound absorbing material 25 and the cover member 26 function as a fixing member and a protection member for the wire harness 28.

Next, the operation and effect of this embodiment will be described. According to the wiring structure of the present embodiment, each fuel injection valve 20
A groove 25b is formed in the sound absorbing material 25 disposed so as to fill the space between the groove 25b and each of the intake manifolds 6.
Since the wire harness 28 is routed inside, and the sound absorbing material 25 is pressed by the cover member 26, the wire harness 28 is pinched and fixed, and is surrounded by the sound absorbing material 26 and the cover member 26. The cable route can be regulated, interference with other components can be avoided, and protection from engine heat and external force can be achieved.

In the present embodiment, the sound absorbing material 25 and the cover member 26 are provided with a function of fixing and protecting the wire harness 28. Therefore, it is possible to effectively use existing parts to fix and wire the wire harness 28. This eliminates the need for conventional high-strength and rigid brackets and protective materials, and reduces the number of parts and costs.

Further, since the wire harness 28 is routed in the concave groove 25b of the sound absorbing material 25, the sound absorbing material 25 functions as a case of the wire harness 28 and as a cushion material. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view (II of FIG. 2) for explaining a wiring harness wiring structure of an engine according to an embodiment of the present invention;
FIG.

FIG. 2 is a plan view of an engine in which the wire harness is arranged.

[Explanation of symbols]

 2 Cylinder head 2b Intake port 6 Intake manifold 20 Fuel injection valve 25 Sound absorbing material 25b Groove 26 Cover member 28 Wire harness

Claims (1)

[Claims] 1. A fuel injection valve is provided at a portion facing an intake port of a cylinder head, an intake manifold is connected to the intake port, and a sound absorbing material is provided in a space between the fuel injection valve and an intake manifold connection portion. In the engine, wherein a cover member for pressing and fixing the sound absorbing material is fixed to the cylinder head, a groove is formed in the sound absorbing material so as to follow a wiring route of a wire harness, and the groove is formed in the groove. A wire harness wiring structure for an engine, wherein the wire harness is arranged, and the wire harness is covered with the cover member.