JP2013167197A - Harness holder of engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain transmission of operation sound of electric parts, without arranging a soundproof exclusive cover.SOLUTION: A fuel injection valve 6 is arranged so that a part thereof is exposed from a head cover 5. A harness holder 9 for holding a wire harness 8 extends in the predetermined length to the cabin side of the fuel injection valve, the harness holder has a body 9a having a recessed part 11 for receiving the wire harness and a cover body 9b for shielding the recessed part, a first wall part 12 is extended for crossing an upper part of the fuel injection valve from the cover body, and a second wall part 13 is arranged for suspending toward the head cover on the side of the fuel injection valve from the recessed part. Since the operation sound of the electric parts can be intercepted by the wall parts without separately arranging a soundproof part, the operation sound of the electric parts is reduced, and silencing of an engine can be promoted. The wall parts as sound insulating walls are arranged on the opposite sides of the head cover side of the electric parts, and the side of the electric parts is opened, so that access for wiring and attaching-detaching work can be easily performed from the side.

Description

  The present invention relates to an engine harness holder, and more particularly to an engine harness holder for holding a wire harness connected to an electric component attached to a cylinder head.

  Various parts (electric parts) that operate by electricity are used in recent automobile engines, such as an ignition device and a fuel injection valve. In an engine in which an ignition device and a fuel injection valve are arranged for each number of cylinders, a wire harness in which a large number of electric wires are bundled into one is used when the number of wirings to them is large. And there exists what fixed the wire harness by hold | maintaining the appropriate place of a wire harness with the harness holder attached to the engine.

  On the other hand, in an engine provided with a fuel injection valve, it is desired to suppress the transmission of an intake sound and an operation sound when the fuel injection valve is opened and closed to the outside of the vehicle. For example, a sound absorbing material is disposed in a space between an intake manifold connected to the intake port of the cylinder head and a fuel rail connected to the fuel injection valve and extending in the axial direction of the camshaft. In some cases, a wire harness is disposed in a concave groove formed on the upper surface, and a sound absorbing material, a wire harness, a fuel injection valve, and a cover member that covers the upper portion of the fuel rail are disposed (see, for example, Patent Document 1).

  Further, there is an engine provided with a design cover that covers the upper surface of the head cover, and there is an engine in which a part of the design cover is extended to cover the upper part of the fuel injection valve (for example, Patent Document 2).

Japanese Patent No. 4276336 JP-A-11-82163

  In the thing of the said patent document 1, although the wire harness is being fixed using the sound-absorbing material, it is not necessary to provide a harness holder separately and there is a soundproofing effect by the sound-absorbing material, but the cover member, the sound-absorbing material is the intake manifold side. Since it is fixed to the cylinder head so as to be pressed, there is a possibility that it cannot be confirmed even if the wire harness is displaced from the concave groove when covered with the cover member, and there is a problem that the assembly becomes complicated.

  Moreover, in the thing of the said patent document 2, the design cover other than a head cover is provided, and there exists a problem that a number of parts increases similarly.

  In order to solve such a problem and suppress the transmission of the operating sound of the electric parts to the outside without providing a dedicated cover for soundproofing, in the present invention, the cylinder head of the engine (1) ( 4) a head cover (5) covering the upper surface, an electric part (6) attached to the cylinder head and having a portion exposed from the head cover, and connected to the electric part and wired outside the head cover. A wire harness (8) and a harness holder (9) that holds the wire harness and is attached to the head cover, wherein the harness holder is disposed on a side of the electric component, and the wire harness A body (9a) having a recess (11) for receiving the wire harness with a predetermined length in the extending direction of the Extending from the body, and was assumed to have a wall portion (12, 13) extending longitudinally of the harness holder.

  According to this, in the engine in which a part of the electric component attached to the cylinder head is exposed from the head cover, the body of the harness holder attached to the head cover is covered with the side opposite to the head cover of the electric component. Since the extending wall portion is provided integrally, the operation sound of the electric component can be blocked by the wall portion without providing a separate soundproofing component. Thereby, the operating noise of the electric parts can be reduced, and the noise reduction of the engine can be promoted. Moreover, by providing a wall portion as a sound insulation wall on the side opposite to the head cover side of the electric component, for example, the side of the electric component is opened, and access for wiring and attaching / detaching work can be easily performed from the side. be able to.

  In particular, the main body so that the wall portion covers the first wall portion (12) extended from the main body so as to cover the side of the electric component opposite to the head cover, and the side of the electric component. It is good to have the 2nd wall part (13) extended toward the said head cover from. According to this, both wall portions cover the two directions of the upper side and the side which are opposite to the head cover of the electric component, so that not only the sound insulation effect can be further enhanced, but also water from the outside and Mud etc. can be prevented from falling on the electric parts.

  The main body includes a first divided body (9a) in which the concave portion is formed and a lid-shaped second divided body (9b) that shields an open surface of the concave portion, and the first wall portion is The second divided body may be formed so as to extend from the lid-like portion, and the second wall portion may be formed so as to hang from the lower surface of the concave portion of the first divided body.

  According to this, it can hold | maintain so that a wire harness may be enclosed by the 1st division body provided with a recessed part and a lid-shaped 2nd division body, and the attachment or detachment operation | work is also easy. In addition, since the wall portions are integrally formed on each of the divided bodies, each of the divided bodies can be reinforced, and the strength of the harness holder including the concave portion and the lid portion can be increased, and the generation of noise due to vibration can be suppressed. obtain. In addition, since the lower portion of the recess can be a dead space that is not easily affected by the layout of other components, the second wall portion that extends in the longitudinal direction of the harness holder is provided on the lower surface of the recess, so that other components are provided. Without interfering with the wall, the wall portion can be arranged as close as possible to the electric component, and the sound insulation effect can be further enhanced.

  The electric component may be a fuel injection valve, and the second wall portion may be disposed on a side opposite to the side to which the fuel supply pipe (8a) of the fuel injection valve is connected. According to this, since the second wall portion is arranged on the side opposite to the side where the fuel supply pipe is arranged with respect to the fuel injection valve, the pipe connection work and the maintenance work of the fuel supply pipe are not performed. 2 The wall does not get in the way. Further, since the interference between the second wall portion and the fuel supply pipe can be avoided, the second wall portion can be provided in a large and wide range, and the sound insulation effect can be enhanced.

  Further, the engine is an in-line multi-cylinder engine, and a plurality of the electric parts are arranged in a cylinder row direction corresponding to each cylinder, and the head cover is configured to separate oil mist contained in gas in the head cover. A gas-liquid separation chamber (10) that protrudes from an upper surface of the head cover and extends along the electric parts; the main body of the harness holder is located above the electric parts; The part may be formed so as to enter between the gas-liquid separation chamber and the electric component from above.

  According to this, in the engine having the gas-liquid separation chamber protruding from the upper surface of the head cover, the second wall portion is arranged in the dead space using the dead space between the electric component and the gas-liquid separation chamber. Even if the second wall portion is provided, the height and width of the entire engine (direction perpendicular to the cylinder row direction) do not increase, and the downsizing of the engine is not hindered. Further, by forming the second wall portion so as to hang down from the lower surface of the recess of the harness holder and enter the dead space, the wall on the harness holder side of the gas-liquid separation chamber can be brought as close to the harness holder as possible, It can easily cope with securing the capacity of the gas-liquid separation chamber. In addition, by fixing the harness holder to the outer surface of the gas-liquid separation chamber, it is not necessary to provide a separate stay, and detachability is good.

  As described above, according to the present invention, in the engine in which a part of the electric component attached to the cylinder head is exposed from the head cover, the side of the harness holder attached to the head cover is opposite to the head cover of the electric component. Since the wall portion extending so as to cover is integrally provided, the operation sound of the electric component can be blocked by the wall portion without providing a separate soundproofing component. Thereby, the operating noise of the electric parts can be reduced, and the noise reduction of the engine can be promoted. Moreover, by providing a wall portion as a sound insulation wall on the side opposite to the head cover side of the electric component, for example, the side of the electric component is opened, and access for wiring and attaching / detaching work can be easily performed from the side. be able to.

1 is a plan view showing an outline of an engine to which the present invention is applied. It is the principal part expanded sectional view fractured | ruptured along the II-II line | wire of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing an outline of an automobile to which the present invention is applied, for example, an in-line four-cylinder engine mounted on a vehicle body as viewed from above, and FIG. 2 is a fragmentary view taken along line II-II in FIG. It is an expanded sectional view.

  The engine 1 includes a cylinder block 3 in which four cylinders 2 are arranged in series, a cylinder head 4 provided on the upper surface of the cylinder block 3 and including a valve mechanism (not shown), and an upper surface of the cylinder head 4. And a head cover 5 for covering. The cylinder head 4 is provided with a fuel injection valve 6 substantially at the center of each cylinder 2 in plan view. The cylinder head 4 is provided with a fuel rail 7 connected to a fuel pump (not shown) for distributing fuel to the fuel injection valves 6 as electric parts so as to extend in the cylinder row direction. The fuel rail 7 and each fuel injection valve 5 are connected to each other through respective fuel pipes 7a that are piped correspondingly.

  The engine 1 is wired with a wire harness 8 connected to a control unit (not shown) provided at an arbitrary location of the vehicle. In addition to the fuel injection valve 5, various electrical components such as an ignition device are disposed in the engine 1, and these are electrically connected to the control unit via a wire harness 8.

  In the engine 1 of this embodiment, the bundle portion of the wire harness 8 is disposed so as to extend in the cylinder row direction at the center portion on the upper surface side of the cylinder head 4. The bundle portion of the wire harness 8 is supported via a harness holder 9 attached to the engine 1. The harness holder 9 is formed of a synthetic resin material and has a shape that is long in the left-right direction in FIG. Further, a breather chamber 11 having a length along the harness holder 9 is provided on the upper surface of the cylinder head 4 on the side opposite to the fuel rail 7 side of the harness holder 9. The breather chamber 11 has a chamber shaped so as to protrude above the head cover 5, and partly communicates with the inside of the head cover 5, and is fixed to the upper surface of the head cover 5 by, for example, a bolt. The breather chamber 11 is for removing oil mist contained in the gas in the cylinder head 4 and may have a known structure, and detailed description thereof is omitted.

  The harness holder 9 has a main body 9a as a first divided body including a recess 11 that is open upward as shown in FIG. 2 in a cross-sectional shape perpendicular to the longitudinal direction and extends over the entire length in the longitudinal direction. And a lid 9b as a second divided body formed in a lid shape of a long plate that shields the upper open surface of the recess 11. The main body 9a and the lid 9b are connected to each other through a thin hinge portion so as to be opened and closed. The wire harness 8 is received in the concave portion 11 of the main body 9a, the concave portion 11 is covered by the lid body 9b, and is elastically engaged, for example, at an appropriate position between the main body 9a and the lid body 9b, and the wire harness 8 is held by the harness holder 9. The

  The main body 9a extends downward at both longitudinal ends of the recess 11 and is fixed to the head cover 5 on the left side of FIG. 1 and to the breather chamber 10 on the right side by two bolts, for example, with bolts. Leg portion 9c. Thus, since the harness holder 9 can be fixed to the head cover 5 via the breather chamber 10, there is no need to provide a separate stay or the like for fixing the harness holder 9, and the number of parts can be reduced.

  The fuel injection valve 6 may have a structure in which, for example, an on-off valve is driven by an electromagnetic valve. Each fuel injection valve 5 is connected to each terminal line 8a branched from the wire harness 8 by, for example, a connector. The main body 9 a of the harness holder 9 is provided with branch recesses 9 d that extend laterally from the recesses 11 in the vicinity of each fuel injection valve 5, and a terminal line 8 a that is connected to the fuel injection valve 5. It is drawn outward from the branch recess 9d.

  In the engine 1 of the present embodiment, the cylinder row is a horizontally placed engine that is orthogonal to the longitudinal direction of the vehicle. As shown in FIG. 2, the breather chamber 10 is arranged on the vehicle compartment side with respect to the fuel injection valve 6, and the fuel pipe 7 a and the terminal line 8 a connected to the fuel injection valve 6 are connected to the vehicle interior side from the fuel injection valve 6. It is pulled out to the outside of the car on the opposite side. The fuel pipe 7a is routed so as to reach the fuel rail 7 disposed outside the fuel injection valve 6. However, the terminal line 8a is pulled out from the fuel injection valve 6 to the outside of the vehicle and then the U-turn. Thus, the wiring is provided so as to reach the harness holder 9 positioned above the fuel injection valve 6.

  The harness holder 9 is formed by integral molding with a rib-shaped first wall portion 12 extending in the extending direction of the terminal wire 8a along the surface of the lid body 9b from the portion covering the concave portion 11 of the lid body 9b. ing. The upper open surface of the branch recess 9d is located on the same plane that is continuous with the upper open surface of the recess 11, and the open surface of the branch recess 9d is also shielded by the first wall portion 12. The first wall portion 12 extends in the longitudinal direction of the harness holder 9 and is provided over the length in the cylinder row direction of all the cylinders.

  As shown in FIG. 2, the recessed portion 11 is disposed at a position corresponding to the gap between the breather chamber 10 and the fuel injection valve 6, and the first wall portion 12 is opposite to the breather chamber 10 from the recessed portion 11. It extends so as to cross the upper side of the fuel injection valve 6 on the side to be operated. Thereby, since the upper part of the fuel injection valve 6 is covered by the first wall part 12, the first wall part 12 functions as a sound insulation wall against the upward direction of the opening / closing valve operating sound of the fuel injection valve 6, and the fuel injection The upward transmission of the opening / closing valve operating sound of the valve 6 is reduced.

  On the other hand, since the projecting height of the breather chamber 10 from the head cover 5 is higher than the height of the fuel injection valve 6, it can function as a sound barrier against the opening / closing valve operating noise of the fuel injection valve 6 toward the vehicle interior side. When the distance between the fuel injection valve 6 and the breather chamber 10 is large, there is a risk of sound leakage.

  On the other hand, a rib-like second wall portion 13 that hangs down from the center of the lower surface of the concave portion 11 (opposite surface of the head cover 5) toward the head cover 5 is formed by integral molding. ing. The second wall portion 13 is provided so as to enter the space between the fuel injection valve 6 and the breather chamber 10 from a position above the fuel injection valve 6. As a result, the second wall 13 can shield the passenger compartment side portion of the upper part of the fuel injection valve 6, so that it reliably functions as a sound insulation wall for the opening / closing valve operating noise of the fuel injection valve 6 toward the passenger compartment. The transmission of the opening / closing valve operating sound of the fuel injection valve 6 to the vehicle compartment side is reduced. Note that the electromagnetic valve that is the source of the operating noise of the fuel injection valve 6 is disposed at the top, and the extension length of the second wall 13 covers the top of the fuel injection valve 6 as shown in FIG. With this, sufficient sound insulation effect can be obtained.

  As described above, since the first wall portion 12 and the second wall portion 13 provided integrally with the harness holder 9 are configured to block the two directions on the fuel injection valve 6 and the vehicle compartment side, the fuel injection valve 6 can be prevented from being transmitted to the upper side of the engine 1 and the passenger compartment side. These wall portions 12 and 13 can be integrally formed at the same time as the main body 9a and the lid body 9b of the harness holder 9, and without significant design changes from the conventional harness holder, It can be applied without requiring any changes.

  In addition, a sufficient soundproofing effect can be obtained only by providing the wall portions 12 and 13 above the fuel injection valve 6 and on the side that blocks the two directions on the vehicle compartment side. The fuel pipe 7a and the terminal wire 8a can be attached and detached without any hindrance, and the fuel injection valve 6 can be removed and attached. In particular, since the upper portion of the fuel injection valve 6 is covered by the first wall portion 12, there is an effect that it is possible to protect against the flying of foreign matters such as water and mud.

  Furthermore, the first wall portion 12 and the second wall portion that extend in directions substantially orthogonal to the concave portion 11 and the lid body 9b that form a space for receiving the wire harness 8 so as to surround the circumference thereof. Since 13 is provided, the strength of the harness holder 9 is increased, the vibration resistance is also increased, and vibration noise is suppressed. Further, by providing the second wall portion 13 below the recess 11 for holding the wire harness 8, a space (dead space) between the breather chamber 10 and the fuel injection valve 6 as in the present embodiment. The second wall portion 13 can be provided on. Thereby, since the second wall portion 13 does not hinder the layout of other components, the engine 1 can be made compact in the height direction and the width direction (direction orthogonal to the cylinder row). Further, the second wall portion 13 can be disposed as close as possible to the fuel injection valve 6 and extends in the longitudinal direction of the harness holder 9, and the sound insulation effect is further enhanced.

  Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to such embodiments so that those skilled in the art can easily understand, and departs from the spirit of the present invention. For example, the present invention is not limited to an in-line four-cylinder engine, and can be applied not only to various multi-cylinder engines but also to single-cylinder engines. In addition, all the components shown in the above embodiment are not necessarily essential, and can be appropriately selected without departing from the gist of the present invention.

1 Engine 4 Cylinder head 5 Head cover 6 Fuel injection valve (electric parts)
8 Wire harness 9 Harness holder 9a Main body (first divided body)
9b Lid (second divided body)
10 Breather chamber (gas-liquid separation chamber)
11 recessed portion 12 first wall portion 13 second wall portion

Claims (5)

A head cover covering an upper surface of a cylinder head of an engine; an electric component attached to the cylinder head and having a portion exposed from the head cover; a wire harness connected to the electric component and wired outside the head cover; A harness holder that holds the wire harness and is attached to the head cover,
The harness holder is disposed on the side of the electric component, and has a main body having a recess for receiving the wire harness with a predetermined length in the extending direction of the wire harness, and the main body so as to cover the electric component. An engine harness holder, comprising: a wall portion extending in a longitudinal direction of the harness holder.   The wall portion extends from the main body so as to cover the upper side of the electric component, and the first wall portion extends from the main body toward the head cover so as to cover the side of the electric component. The engine harness holder according to claim 1, further comprising two wall portions. The main body includes a first divided body in which the concave portion is formed, and a lid-shaped second divided body that shields an open surface of the concave portion,
The first wall portion is formed extending from the lid-like portion of the second divided body,
The engine harness holder according to claim 2, wherein the second wall portion is formed so as to hang down from a lower surface of the concave portion of the first divided body. The electric component is a fuel injection valve;
4. The harness holder for an engine according to claim 2, wherein the second wall portion is disposed on a side opposite to a side to which a fuel supply pipe of the fuel injection valve is connected. 5. . The engine is an in-line multi-cylinder engine;
A plurality of the electric parts are arranged in the cylinder row direction corresponding to each cylinder,
The head cover has a gas-liquid separation chamber that protrudes from the upper surface of the head cover so as to separate oil mist contained in the gas in the head cover and extends along the electric parts.
The body of the harness holder is positioned above the electric component;
The engine according to any one of claims 2 to 4, wherein the second wall portion is formed so as to protrude from above between the gas-liquid separation chamber and the electric component. Harness holder.

Images