JPH10325357A - Internal combustion engine housing transmission line and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ascertain electric connection between a controlling part assembled in an engine and a wire harness, simplify connection operation of a connector, and also simplify a wiring arrangement route of a transmission line around the engine. SOLUTION: An engine 10 has an engine body 11, a head cover body 12a, having a controlling part assembled therein for controlling a driving state of the engine 10, which is closedly attached so as to cover mechanisms such as a cam shaft and a cam gear arranged on an upper side of a cylinder head, and a coating member 12b arranged so as to close a recessed inner place formed in the head cover body 12a. A transmission line 14 is laid inside the recessed inner space of the head cover body 12a, which line electrically connects a controlling part 31 to a connector 15 through a plurality of junction terminals 12c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine for a vehicle, and more particularly, to a cylinder head cover which is mounted in close contact with a cylinder block of an engine body to transmit signals to and from electric control parts for controlling various driving of the engine. The present invention relates to an internal combustion engine having a built-in transmission line and a method of manufacturing the internal combustion engine.

[0002]

2. Description of the Related Art In recent years, lighter aluminum or resin materials have been increasingly used as members constituting vehicles instead of conventional steel plates. Of these, the resin material is generally applied to bumpers, interior parts, and the like, but the range of application of the resin material to vehicles is becoming more diversified, and the material properties of the resin material are becoming more multifunctional. For example, a resin material (engineering plastic) having high stability in a high temperature environment and excellent oil resistance has been developed, and application of such a resin material to an engine has been studied.

On the other hand, drive control of an engine mounted on a vehicle has been rapidly digitized in recent years, and various drive states such as fuel injection by an injector, a fuel ratio, and intake / exhaust timing are controlled by a control unit equipped with a microcomputer. Centrally controlled. Therefore, in addition to injectors and coil plugs, control components such as various sensors and electronic components are incorporated into the engine, and control signals between these control components or the control unit are transmitted to a wire harness provided around the engine. It is performed by.

[0004] FIG. 4 is a schematic diagram showing a wiring state of a wire harness in a conventional vehicle-mounted engine.
The engine 10 is roughly divided into an engine main body 11 having a cylinder block, a cylinder head cover (hereinafter, referred to as a camshaft and a cam gear, which is attached to an upper portion of a cylinder head of the engine main body 11, and which covers a reciprocating valve and a rocker arm). , A head cover) 12. A control component 13 such as an injector, a coil plug, and various sensors is incorporated in the engine 11 and its surroundings, and these components and a control unit (not shown) are connected to a wire harness 16.
Are electrically connected. Electrical components such as wire harnesses are installed after the engine is assembled,
In order to avoid the engine 11 and its peripheral parts, and to protect the wire harness 16 from thermal influences around the engine, the wiring harness 16 is fixedly routed in a three-dimensional path, or is made of polypropylene (PP) or polyamide (polypropylene). It is necessary to mount a protector 17 made of a heat-resistant material obtained by adding a glass fiber or the like to a synthetic resin material such as polyamid (PA). The connection between the control component 13 incorporated in the engine 11 and the wire harness 16 is connected by a connector 15 as shown in FIG. Need to be connected one by one. Note that FIG. 4 shows only the configuration of the engine 10 on the intake side, and FIG.
9 is an intake manifold, and 20 is a fuel pipe.

On the other hand, as a configuration for simplifying the connector connection between a plurality of control components incorporated in such an engine and a wire harness, a configuration as disclosed in Japanese Patent Laid-Open No. Hei 5-231174 is known. . That is, a plurality of ignition coils (corresponding to the above coil plug)
And the connector at the end of the wire harness are connected collectively. On the back of the cylinder head cover (wiring cover) attached to the cylinder head (corresponding to the above head cover), a connector and a wiring conductor that match the arrangement of the ignition coil The electrical connection is made by attaching the cylinder head cover to the cylinder head.

[0006]

In such a configuration in which a connector and a wiring conductor are provided on the wiring cover, a power receiving connector such as a coil plug or an injector incorporated in the head cover and a power supply connector provided on the back surface of the wiring head cover are used. At the time of connection, it is necessary to accurately set the mutual positional relationship, and there has been a problem that the efficiency of the connector connection work is reduced. In addition, since the wiring cover is simply fastened and fixed to the head cover with bolts, there is a problem in that the contaminants such as moisture and dust enter from outside to cause deterioration and failure of connectors and conductor wiring. ing.

[0007] Therefore, there has been a demand for an engine configuration in which the connector connection with the control component is simple, does not cause a decrease in the efficiency of the assembling work, and the wiring route of the wire harness is not complicated. In addition, moisture and dust from outside,
There has been a demand for a high quality engine that can reliably prevent intrusion of oil and the like. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, to ensure an electrical connection state between a control component incorporated in an engine and a transmission line (wire harness), and to simplify a connector connection operation. It is an object of the present invention to provide a transmission line built-in type internal combustion engine capable of simplifying a wiring route of the transmission line around the engine and a method of manufacturing the same.

[0008]

According to a first aspect of the present invention, there is provided an internal combustion engine with a built-in transmission line, in which a part of a rotary motion generating mechanism is exposed, and wherein the rotary motion is exposed. A head cover part attached to the engine body so as to cover the generating mechanism; and a control part attached to the head cover part and controlling a driving state of the engine, wherein the head cover part is attached with the control part. And a transmission line for electrically connecting the control component and a connection terminal exposed on the outer surface side is provided in a concave interior provided on a side closely attached to the engine main body, and the engine A head cover main body having an attachment portion that is attached to the main body, and a head cover main body provided on a side of the head cover main body that is attached to the engine main body, Sealing the interior of the concave of the head cover body tract is provided, it is characterized in that it is constituted by a coating material having oil resistance sealing.

According to such a transmission line built-in type internal combustion engine, a coil plug and a sensor (control parts) incorporated in the head cover main body and a connector (connection terminal) exposed on the outer surface side of the head cover main body are provided. It is possible to realize a modularized head cover (head cover part) that is electrically connected in advance by a transmission line inside the concave portion of the head cover main body and sealed and sealed with an oil resistant coating material (or potting material). Therefore, it is not necessary to manufacture a wire harness around the engine having a complicated wiring route, and the wiring route of the wire harness can be shortened and simplified. Since the connector can be easily connected, Complex routing of over harness, mounting and connecting work can be simplified. In addition, even if the coating material is placed on the engine body side where the crankshaft, gears, etc. are exposed, the head cover is tightly attached to the engine body, and since the coating material has oil resistance, it is transmitted from the engine body side. The influence of the driving oil on the track can be suppressed, and the track can be protected well. Further, the transmission line is completely sealed and sealed from the outside by the head cover body and the coating material, so that intrusion of moisture, dust, and the like from the outside of the engine can be prevented.

According to a second aspect of the present invention, there is provided a method for manufacturing an internal combustion engine with a built-in transmission line, wherein a plurality of relay terminals provided inside a concave portion of a head cover body which is closely attached to the engine body and an outer surface side of the head cover body. Forming a transmission line that electrically connects the exposed connection terminals to each other within the concave shape of the head cover body, and controlling the driving state of the engine at a predetermined position of the head cover body. Attaching parts and electrically connecting to the connection terminal via the relay terminal and the transmission line,
A step of sealing and sealing the concave interior of the head cover body with an oil-resistant coating material to form a head cover component having the control component, and a side of the head cover component sealed and sealed by the coating material. And a step of connecting the connection terminal exposed on the outer surface side to a predetermined object to be connected.

According to such a method of manufacturing an internal combustion engine with a built-in transmission line, a control component and a connector (connection terminal) which are provided in advance in the concave portion of the head cover body of the engine (internal combustion engine) and are exposed to the outer surface side. To form a head cover (head cover part) that protects the relay terminal and the transmission line by forming a relay terminal and a transmission line that electrically connect the relay terminal and the transmission line, and sealing and sealing the concave inside of the head cover body with a coating material. The wiring work and wiring work around the engine can be dispensed with by assembling the engine body and the head cover, and the connection with the wiring harness (connection target) on the control unit side can be done with a connector (connection terminal). Wiring harness after engine assembly To simplify the mounting and connection work,
Work efficiency can be greatly improved. In addition, since the coating material only needs to cover and protect the relay terminal and the transmission line formed inside the concave portion of the head cover main body, it is necessary to set the positional relationship with the head cover main body in the sealing and sealing work. Therefore, the efficiency of the engine assembling work can be improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing one embodiment of a transmission line built-in type internal combustion engine according to the first aspect of the invention. FIG.
In FIG. 1A, reference numeral 10 denotes an internal combustion engine such as a gasoline engine mounted on a vehicle (hereinafter referred to as an engine). The engine 10 performs a rotary motion via a crankshaft from a linear reciprocating motion accompanying a compression / expansion cycle of a cylinder. An engine body 11 having a well-known cylinder block having a mechanism for generating the engine, a control part (control part) such as a coil plug and a sensor for controlling a driving state of the engine 10 are incorporated. It has a head cover (head cover part) 12 attached tightly so as to cover a camshaft and a cam gear that perform a rotating motion and a valve and a rocker arm that perform a reciprocating motion. In particular, as shown in FIGS. 1B and 1C, the head cover 12 hermetically seals the head cover main body 12a which is closely attached to the engine main body 11 and the concave interior provided on the engine main body 11 mounting side of the head cover main body 12a. A plurality of relay terminals 12c formed of a coating material 12b to be sealed and provided inside the concave shape of the head cover body 12a, and a transmission line for electrically connecting each relay terminal 12c to a connector (connection terminal) 15. 14 is sealed by the coating material 12b. FIG. 1 (c) is the same as FIG. 1 (b)
2 is an exploded view of the configuration of the head cover 12 shown in FIG.

The connector 15 is connected to the wire harness 1 on the control unit side (hereinafter referred to as a primary side).
In order to make a connection with the head cover body 6, the head cover body 12 a is provided so as to be partially exposed on the outer surface side thereof. A predetermined control component 31 is mounted and fixed to a control component mounting pedestal 12d provided on the head cover main body 12a, and is configured to be electrically connected to a relay terminal as described later. Further, the transmission path 14 is configured by a single core wire or a bus bar type wiring member, and has a configuration in which a wire harness portion conventionally routed around the engine is separated and incorporated into the head cover 12. In order to electrically connect the control component 31 and the wire harness 16 on the primary side, it is formed with a predetermined wiring path.

In the engine 10 having such a configuration,
The engine body 11 is generally made of cast iron, and the head cover 12 is made of, for example, a resin material having excellent heat resistance and oil resistance, which is being considered for use in recent years. for that reason,
The head cover body 12a made of a resin material and the control component mounting pedestal 12d and the like provided inside the concave shape are integrally formed, and the relay terminal 12c is incorporated corresponding to the control component 31 mounted thereon. I have. The coating material 12b that covers the transmission line 14 provided inside the concave shape of the head cover body 12a includes at least the engine body 11 with respect to the transmission line 14.
It is necessary to have airtightness (adhesion with the head cover main body 12a) and oil resistance to the extent that the influence of the driving oil from the side can be cut off. it can. And the coating material 12
As b, it is possible to use a material having characteristics capable of blocking or reducing heat and operation noise accompanying the driving of the engine 10 in addition to sealing performance and oil resistance. As a method of sealing and sealing the coating material 12b, for example, a method of pouring a liquid epoxy resin into the head cover body 12a,
A transfer molding method or the like in which a coating and spraying method or a powdered resin material is heated and melted and then solidified and sealed can be applied.

According to the engine 10 to which the head cover 12 is applied, the transmission line 14 corresponding to the wire harness around the engine is built into the head cover 12 together with the control component 31, and is connected by the transmission line 14 along a predetermined wiring path. With such a modular structure, the wiring route around the engine can be simplified by eliminating the wiring harness wiring work having a complicated wiring route which has been conventionally performed after the engine is assembled. Since the control component 31 and the connector 15 provided on the outer surface side of the head cover 12 are electrically connected by the transmission line 14 provided inside the head cover 12, the connector 15 is connected to the primary side wire. Harness 16
With the simple work of connecting the cable and the connector, the work of attaching and connecting the wire harness around the engine can be performed, and the working efficiency can be improved. Further, the coating material 12b can protect the relay terminal 12c, the transmission line 14, and the like by, for example, pouring a liquid resin into the concave inside of the head cover body 12a as described above. , Head cover body 12a
This eliminates the need for the work of setting the positional relationship with the engine, and can improve the efficiency of the engine assembling work. Further, since the inside of the head cover 12 can be completely sealed and sealed from the outside by the coating material 12b, the influence of the driving oil from the engine body 11 side can be prevented, and the outside of the engine can be prevented. Intrusion of moisture, dust, and the like can be prevented.

In this embodiment, only the transmission lines corresponding to the control parts incorporated in the head cover are shown. However, the transmission lines corresponding to the control parts attached to the peripheral parts other than the head cover are connected to the head cover. It may be a structure extending from In recent years, a fuel direct injection type engine, in which an injector is placed at the top of the cylinder and fuel is injected directly into the cylinder, has been put into practical use.In addition to conventional coil plugs and various sensors, it is necessary to incorporate an injector into the head cover. Although the wiring of the surrounding wire harnesses is further complicated, according to the present invention, the transmission lines corresponding to these control components can be provided in the head cover in advance, so that the wiring of the wiring harness around the engine is provided. The route can be further simplified.

Next, FIG. 2 shows a method of connecting control parts which can be suitably applied to the engine 10 shown in FIG. FIG. 2A shows the head cover 1 shown in FIG.
2 is a partial cross-sectional view showing a configuration in which a control component 31 is fastened and fixed to a control component mounting pedestal 12d from an upper surface (upper side in the drawing) of a head cover main body 12a by bolts 33. Here, on the lower surface of the attachment portion 32 extending from the control component 31, an electrode 32a for transmitting a signal to the outside is formed so as to be exposed, and when attached to the head cover body 12a, the electrode 32a faces the head cover body 12a. It is in electrical contact with the contact side (upper drawing) of the incorporated relay terminal 12c. As shown in FIGS. 2B and 2C, the relay terminal 12c has a wiring material holding portion for holding and fixing the wiring material on the non-contact side (upper side of the drawing). Are electrically connected and held. The entire area of the transmission line 14 and the relay terminal 12c except for the control component 31 is covered and protected by the coating material 12b on the engine body mounting side (the lower part of the drawing) of the head cover main body 12a provided with the transmission line 14. . Here, the coating material 12b
Is the head cover body 12a in the sealing and sealing process.
Of the engine body 11 side, the effect of the drive oil from the engine body 11 side on the transmission line 14 and the like is well blocked, and the mounting surface between the engine body 11 and the head cover 12 is A well-known sealing material 12e is interposed between the first and second motors to block invasion of moisture, dust and the like from the outside of the engine.

FIGS. 2 (b) and 2 (c) show an example of the relay terminal. The relay terminal has a shape elastically bent toward the contact side (downward in the drawing) as shown in FIG. 2 (b). A relay terminal 21c having a shape in which only the contact portion is protruded and projected as shown in FIG. Next, one embodiment of a method of manufacturing a transmission line built-in type internal combustion engine according to the second aspect of the present invention is shown in FIG.

As shown in FIG. 3A, inside the head cover body 12a, a plurality of relay terminals 12 are arranged in a predetermined arrangement.
c and a control component mounting base 12d are provided, and a connector (connection terminal) 15 having a connection electrode protruding on the inner side is provided on the outer surface side. In such a head cover body 12a, as shown in FIG. 3 (b), the relay terminal 12c and the connection terminal 15 are connected by a single-core wire or a bus bar type wiring member to form a transmission line 1 having a predetermined wiring path.
4 is formed. Next, as shown in FIG. 3C, a control component 31 such as a sensor is mounted on the control component mounting base 12d, and the control component 31 and the connector 15 are electrically connected via the relay terminal 12c and the transmission line 14. Next, as shown in FIG. 3 (d), a coating material 12b such as a liquid epoxy resin is poured into the head cover body 12a on the side where the head cover body 12a is attached to the engine body 11 (upper part of the drawing), and the functional part (tip) ) Except for the entire surface inside the concave portion of the head cover body 12a except for the
c and the transmission line 14 are sealed. This allows
Modularized head cover (head cover component) 1 incorporating control component 31 and incorporating transmission line 14
Form 2 Further, as shown in FIG. 1A, the head cover 12 is attached to a predetermined position of the engine main body 11 by a fastening member such as a bolt so that the coating material 12b is in close contact with the predetermined position, and the assembly of the engine 10 is completed.
After the engine 10 is assembled to the vehicle, the connector 15 provided on the outer surface of the head cover 12 is connected to the primary-side wire harness (connection target) 16, and the work of attaching and connecting the wire harness around the engine is completed. I do.

According to such a method of manufacturing an internal combustion engine with a built-in transmission line, the transmission path 14 connects the control component 31 and the connector 15 to the head cover 12 in advance by a predetermined wiring path.
The head cover 12
After being attached in close contact with the engine main body 11, the wire harness around the engine can be attached and connected simply by making a connector connection with the primary-side wire harness 16, and the working efficiency can be greatly improved. . Further, the coating material 12b is formed by pouring, coating, transfer molding, or the like as described above by using the relay terminal 12c provided inside the concave portion of the head cover body 12a.
And the transmission line 14 and the like can be sealed and sealed, and can be protected in terms of oil resistance. Therefore, at the time of sealing and sealing, it is not necessary to set the positional relationship with the head cover body 12a, and the engine The efficiency of the assembling work can be improved.

In another embodiment of the present invention, the head cover main body 12a is coated with a coating material 12b for covering the concave interior of the head cover main body 12a.
The head cover 12 incorporating the transmission line 14 may be formed by sealing the inside of the concave shape of the head cover body 12a by secondary molding using a heat-resistant and oil-resistant resin material that constitutes a. Good.

According to such a configuration, since the adhesion between the head cover body 12a and the coating material 12b can be improved, the invasion of moisture, dust, oil, etc. from the outside can be reliably prevented and the head cover 12 is built into the head cover 12. There is an advantage that the quality of the transmission line 14 can be maintained. In each of the above-described embodiments, an engine mounted on a vehicle has been described as an example. However, the present invention is not limited to this, and a transmission line for performing signal transmission with a control component is provided around the engine. It goes without saying that any internal combustion engine can be applied favorably.

[0023]

As described above, according to the transmission line built-in type internal combustion engine of the first aspect, the coil plug, the sensor and the like incorporated in the head cover main body and the connector provided on the outer surface side of the head cover main body are provided. Is electrically connected in advance by a transmission line inside the concave shape of the head cover body, and a modularized head cover can be realized by sealing and sealing with an oil-resistant coating material, so that a complicated wiring route is provided. It is not necessary to manufacture a wire harness around the engine having the
Since it can be easily connected to the wire harness on the control unit with one or several connectors, complicated wiring harness around the engine,
Mounting and connection work can be simplified. In addition, even if the coating material is placed on the engine body side where the crankshaft, gears, etc. are exposed, the head cover is tightly attached to the engine body, and since the coating material has oil resistance, it is transmitted from the engine body side. The influence of the driving oil on the track can be suppressed, and the track can be protected well. Furthermore, since the transmission line is completely sealed and sealed from the outside by the head cover body and the coating material,
It is possible to prevent intrusion of moisture, dust, and the like from the outside of the engine.

According to the method of manufacturing an internal combustion engine with a built-in transmission line according to the second aspect of the present invention, according to the method of manufacturing an internal combustion engine with a built-in transmission line, the recess inside the head cover body of the engine is preliminarily provided. Forming a relay terminal and a transmission line for electrically connecting the control component and the connector provided on the outer surface side, and sealing and sealing the concave interior of the head cover body with a coating material to form the relay terminal and the transmission line. By configuring the protected head cover, the wiring work and wiring work around the engine can be omitted by assembling the engine body and the head cover, and the connection with the wiring harness on the control unit side is connected by a connector. Because it can be done easily, wiring, installation, and The connection work can be simplified, and the work efficiency can be greatly improved. In addition, since the coating material only needs to cover and protect the relay terminal and the transmission line formed inside the concave portion of the head cover main body, it is necessary to set the positional relationship with the head cover main body in the sealing and sealing work. Therefore, the efficiency of the engine assembling work can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of a transmission line built-in type internal combustion engine according to claim 1 of the present invention.

FIG. 2 is a schematic configuration diagram showing a method for connecting control components applied to the transmission line built-in type internal combustion engine according to the present invention.

FIG. 3 is a process diagram showing one embodiment of a method of manufacturing a transmission line built-in type internal combustion engine according to claim 2 of the present invention.

FIG. 4 is a diagram illustrating a wiring state of a wire harness in a conventional vehicle engine.

FIG. 5 is a diagram showing a connection structure between a control component and a wire harness.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Engine 11 Engine main body 12 Head cover 12a Head cover main body 12b Coating material 12c Relay terminal 12d Control component mounting pedestal 12e Seal material 13 Coil plug 14 Transmission line 15, 15a Connector 16 Primary wire harness 17 Protector 18 Injector 19 Intake manifold 20 Fuel pipe 31 Control parts

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takayuki Sakakura 1-14 Nishisuehirocho, Yokkaichi-shi, Mie Sumitomo Wiring Systems, Ltd. (72) Inventor Ryusuke Ito 1-14 Nishisuehirocho, Yokkaichi-shi, Mie Sumitomo Inside Electric Equipment Co., Ltd. (72) Inventor Toru Niwa 1-4-1, Chuo, Wako-shi, Saitama Pref. Inside Honda R & D Co., Ltd. (72) Ryuji Umehara 1-4-1, Chuo, Wako-shi, Saitama Pref. Inside the Honda Research Laboratory

Claims (2)

[Claims] 1. An engine body in which a part of a rotating motion generating mechanism is exposed, a head cover component closely attached to the engine body so as to cover the exposed rotating motion generating mechanism, and an engine mounted on the head cover component. A control part for controlling the driving state of the head cover part, the control part is attached, and the concave part provided on the side closely attached to the engine body, the control part and the outer surface side A transmission line that electrically connects the exposed connection terminals is provided, and a head cover body having a mounting portion that is closely attached to the engine body, and a side of the head cover body that is closely attached to the engine body. An oil-resistant coating for sealing and sealing the concave interior of the head cover body provided with the transmission line. An internal combustion engine with a built-in transmission line, comprising: A plurality of relay terminals provided inside a concave portion of the head cover body which is closely attached to the engine body, and connection terminals provided on the outer surface side of the head cover body. Forming transmission lines that are electrically connected to each other inside the control unit, and attaching a control component for controlling a driving state of an engine to a predetermined position of the head cover body, and performing the connection via the relay terminal and the transmission line. Electrically connecting to the terminal, sealing and sealing the concave interior of the head cover main body with an oil-resistant coating material to form a head cover component having the control component, and coating the head cover component with the coating. A step of closely attaching the side sealed and sealed by the material to the engine body; Method for producing a transmission line embedded internal combustion engine, characterized by comprising a step of connecting to the connection object.