JPH06229256A - Engine heat shield plate mounting structure - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to improve the strength of a camshaft cap by means of a heat shield plate, prevent failure of electric parts, reduce friction loss, and prevent uneven distribution. It is intended to prevent wear and prevent an increase in weight of the camshaft cap. In addition, the number of parts can be reduced by eliminating the need for a separate fixture to attach the heat shield plate.
It is to reduce the number of processing steps. Therefore, according to the present invention, the heat shield plate is configured to communicate with the cylinder head and the cam shaft cap, and the heat shield plate is provided by being fixed to the cylinder head and the cam shaft cap by the fitting of the electric component. ing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat shield plate mounting structure for an engine, and more particularly to a heat shield plate mounting structure for an engine which can improve the strength of a camshaft cap and reduce the number of parts by the heat shield plate. .

[0002]

2. Description of the Related Art In an engine, a cam shaft is rotatably supported by a cam shaft cap on an upper portion of a cylinder head, and electric parts such as a cam angle sensor and a distributor are attached to an end portion of the cam shaft. However, if this electric component is disposed in the vicinity of the exhaust manifold, which is an exhaust system component of the cylinder head, or the exhaust pipe, its function is impaired by radiation of exhaust heat. Therefore, a heat shield plate is attached to protect the electric components from exhaust heat.

As a method of mounting the heat shield plate, for example,
When directly attached to the cam angle sensor which is an electric component,
Further, it may be mounted directly on the exhaust pipe, or may be mounted on a part other than the cam angle sensor or the exhaust pipe by a cylinder head or the like. Further, the cam angle sensor is mounted overhanging the camshaft cap and the cylinder head due to its function.

A mounting structure for such an electric component is disclosed in, for example, Japanese Patent Application Laid-Open No. 57-12302. In this publication, the valve camshaft is of a type supported by at least two bearings, and an angle sensor is arranged between the bearings, whereby the space existing between the bearings is effectively used. Is.

[0005]

However, in the conventional heat shield plate mounting structure, a mounting bolt, which is a mounting tool, is separately required for mounting the heat shield plate, which increases the number of parts. At the same time, it is necessary to process the tightening holes and the seat surface, which increases the number of processing steps.

Further, when the cam angle sensor is attached to the camshaft cap, the mounting position of the camshaft angle sensor on the camshaft cap is relatively insufficient in strength, so that the electronic components in the camshaft angle sensor malfunction due to engine vibration. There was an inconvenience to do.

Further, as a countermeasure when the cam angle sensor is attached to the camshaft cap by overhanging,
When the strength of the camshaft cap is improved, there is a disadvantage that the weight increases.

Furthermore, the insufficient strength of the camshaft cap causes
There is a disadvantage that the bearing portion of the camshaft cap is easily deformed, resulting in increased friction loss and uneven wear.

[0009]

Therefore, according to the present invention, in order to eliminate the above-mentioned inconvenience, electric parts attached to a cam shaft pivotally supported by a cam shaft cap at an upper portion of a cylinder head are protected from exhaust heat. In a heat shield plate mounting structure of an engine provided with a heat shield plate in order to connect the cylinder head and the cam shaft cap, the shield plate,
The heat shield plate is fixedly provided to the cylinder head and the camshaft cap by a fitting for the electric component.

[0010]

According to the structure of the present invention, since the heat shield plate is attached so as to connect the cylinder head and the cam shaft cap, the heat shield plate functions as a reinforcing member of the cam shaft cap, and the cam shaft. The strength of the cap is improved, which allows
It is possible to prevent a failure from occurring in an electric component, reduce friction loss, prevent uneven wear, and prevent an increase in weight of the camshaft cap. Further, a separate mounting tool is not required for mounting the heat shield plate, so that the number of parts can be reduced and the number of processing steps can be reduced.

[0011]

Embodiments of the present invention will be described in detail and specifically with reference to the drawings. 1 to 3 show an embodiment of the present invention. 1 and 2, 2 is an engine,
Reference numeral 4 is a cylinder block, 6 is a cylinder head, and 8 is a cylinder head cover. In the cylinder head 6,
An intake manifold 10 is attached to one side. An intake pipe 12 is connected to the intake manifold 10.
An exhaust manifold 14 is attached to the other side of the cylinder head 6. An exhaust pipe 16 is connected to the exhaust manifold 14.

A cam shaft 18 is axially supported by a cam shaft cap 20 on the upper portion of the cylinder head 6. As shown in FIG. 1, a sensor mounting arm portion 22 is provided so as to project obliquely upward on the exhaust system side of the engine 2.

A cam angle sensor 24, for example, is provided as an electrical component on the cam shaft 20 on the end side of the cam shaft cap 20.
Is installed.

The cam angle sensor 24 is provided with a head side mounting projection 26 for contacting the outer surface of the cylinder head 6 and a cap side mounting for contacting the sensor mounting arm 22 of the cam shaft cap 20. The protrusion 28 is formed.

A head-side mounting long hole 30 is formed in the head-side mounting projection 26, and a cap-side mounting long hole 32 is formed in the cap-side mounting projection 28.

The cam angle sensor 24 is inserted through the head-side mounting elongated hole 30 and is inserted through the cap-side mounting elongated hole 32 and the head-side mounting bolt 34, which is a fixture that is screwed onto the outer surface of the cylinder head 6. The sensor mounting arm portion 22 is fixedly mounted by a cap side mounting bolt 36 which is a mounting tool screwed to the tip end side of the sensor mounting arm portion 22.

A heat shield plate 38 is provided to protect the cam angle sensor 24 from the exhaust heat of the exhaust manifold 14 and the exhaust pipe 16.
Is installed.

This heat shield plate 38, as shown in FIGS.
The heat shield main body portion 38a formed wide with the width W should surround the cam angle sensor 24 on the side of the exhaust manifold 14 and the exhaust pipe 16, that is, the cam angle sensor 24 and the exhaust manifold 14.
The one end 38a is located between the exhaust pipe 16 and the head mounting protrusion 26 of the cam angle sensor 24 in order to connect the cylinder head 6 and the sensor mounting arm 22 of the cam shaft cap 20. The extension is provided and the other end 38c is also extended to the cap-side attachment projection 28 of the cam angle sensor 24. The head side mounting bolt 34 and the cap side mounting bolt 36 are attached to one end 38b and the other end 38c of the heat shield plate 38, respectively.
Each bolt insertion hole (not shown) through which the bolt is inserted is formed.

The cylinder head 6 has a manifold heat shield plate 40 located above the exhaust manifold 14.
Are attached by the manifold side mounting bolts 42. Reference numerals 44 and 44 are cap mounting bolts of the camshaft cap 20.

Next, the operation of this embodiment will be described.

When installing the heat shield plate 38, one end 38
The head side mounting bolt 34 is inserted into the bolt insertion hole of b and the head side mounting hole 30, and the head side mounting bolt 34 is screwed to the cylinder head 6, and the other end 38
The cap side mounting bolt 36 is inserted into the bolt insertion hole of c and the cap side mounting long hole 32, and the cap side mounting bolt 36 is screwed to the sensor mounting arm 22.

As a result, the cam angle sensor 24 is not directly attached to the cam shaft cap 20, and the heat shield plate 38 connects the cylinder head 6 and the cam shaft cap 20 to each other to reinforce the cam shaft cap 20. Since the function of the cam shaft cap 20 is increased, the strength of the cam shaft cap 20 is increased.
It is possible to prevent the electronic components in the cam angle sensor 24 from failing due to the vibration of the engine 2, and the function of the cam angle sensor 24 is satisfactorily ensured, and the processing of the cam shaft cap 20 is unnecessary, so that the cam shaft cap is not required. Since the bearing portion 20 is not deformed, it is possible to prevent an increase in friction loss and uneven wear.

Exhaust heat from the exhaust manifold 14 side is blocked by the heat shield main body portion 38a of the heat shield plate 38,
The cam angle sensor 24 is protected.

Further, it is not necessary to improve the strength of the camshaft cap 20 itself, and the increase in weight can be prevented.

Further, since the shield plate 38 is attached, a separate mounting tool is not required, and since it is not necessary to separately provide the cam shaft cap 20 with a reinforcing member, it is possible to reduce the number of parts and to mount the shield plate 38. It is possible to reduce processing man-hours by eliminating processing work.

Although the heat shield plate 38 of the cam angle sensor 24 has been described in the above embodiment, the heat shield plate of other electric parts such as a distributor can be constructed in the same manner to obtain the same effect. Is.

[0027]

As is apparent from the above detailed description, according to the present invention, the heat shield plate is configured to communicate with the cylinder head and the camshaft cap, and the heat shield plate is attached to the cylinder head by the fitting of the electric component. By fixing the camshaft cap to the camshaft cap and the camshaft cap, the strength of the camshaft cap is improved by the heat shield plate, which prevents electrical components from failing and reduces friction loss. It is possible to prevent uneven wear and prevent an increase in weight of the camshaft cap.

Further, by not requiring a separate mounting tool for mounting the heat shield plate, it is possible to reduce the number of parts and the number of processing steps.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a heat shield plate mounting structure on a rear side of a cylinder head.

FIG. 2 is a plan view of a heat shield mounting structure for an engine.

3 is a cross-sectional view of the cylinder head taken along the line 〓-〓 of FIG.

[Explanation of symbols]

 2 Engine 6 Cylinder Head 14 Exhaust Manifold 16 Exhaust Pipe 18 Cam Shaft 20 Cam Shaft Cap 22 Sensor Mounting Arm 24 Cam Angle Sensor 34 Head Side Mounting Bolt 36 Cap Side Mounting Bolt 38 Heat Shield

Claims (1)

[Claims] 1. A heat shield plate mounting structure for an engine, wherein a heat shield plate is provided in order to protect electric components mounted on a cam shaft pivotally supported by a cam shaft cap at an upper portion of a cylinder head from exhaust heat. A plate is configured to communicate with the cylinder head and the camshaft cap, and the heat shield plate is fixedly provided to the cylinder head and the camshaft cap by a fitting of the electric component. Engine heat shield plate mounting structure.