JPH0612220Y2 - front cover - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a cover member for covering a timing drive unit of an engine and a sprocket for receiving the same. Specifically, the cover member is provided with vibration and sound insulation. Regarding shape improvement.

[Prior Art] Conventionally, various improvements have been made to each part in order to reduce vibrations and mechanical noises generated during engine operation, and a cylinder head cover, an oil pan, a front cover, and a side that easily cause resonance and resonance. This is also applied to cover members such as covers.

Looking at the case of the front cover that surrounds the timing portion, a vibration isolation structure such as Japanese Utility Model Publication No. 1-1963 has been developed.

In this structure, a case body is formed in an outer frame shape having a perforated portion, and the perforated portion is covered with a vibration damping member to form a gear case.

[Problems to be Solved by the Invention] However, in the structure in which the holed portion is covered with the damping member, the integration is troublesome and the molding cost is increased, and the damping member has a sufficient sealing force. Since it was not there, it could only lose its function as a cover member.

It is an object of the present invention to eliminate such drawbacks, and to provide a front cover which has a large vibration damping effect and sealing effect with good moldability and wearability.

Hereinafter, a detailed description will be given with reference to the drawings.

[Means for Solving the Problems] As shown in the first surface, the present invention is a front cover A that surrounds and seals a timing drive unit of an engine, and has a strong flange portion 1 made of a metal material. The front cover A is constituted by the cover portion 2 made of an elastic body such as synthetic rubber or synthetic resin, and the elastic body of the cover portion 2 is extended to the flange portion 1 and integrated with the gasket 3. I am trying.

Further, a metal plate, a wire mesh,
It is characterized in that a reinforcing plate 5 such as a perforated plate or a composite plate of a metal material and a synthetic resin material is inserted.

[Operation] The present invention having the above-described structure exhibits the following excellent operation.

That is, the front cover A of the engine is attached to the block portion 4 in which a cylinder block, a cylinder head, a crankshaft oil seal retainer, etc. are integrally assembled, and different vibrations and complicated shape changes occur in each portion. However, the flange portion 1 of the present invention only needs to satisfy the requirement of enclosing the sealed portion, so that the flange portion 1 can be formed with high rigidity and can be finished extremely lightweight.

In addition, as shown in FIG. 1, the cover portion 2 integrated with the gasket 3 made of an elastic body is an integral body having the same material as a whole, so that it has an advantage that it can be molded by a generally known simple molding method. In particular, it doubles its superiority in materials that are vulcanized and molded.

In the front cover A in which the flange portion 1 and the cover portion 2 are integrated, the entire inner surface thereof is covered with an elastic body including the sealing surface of the flange portion 1, and the sealing surface of the block portion 4 and one side of the gasket 3 are in contact with each other. Since there is only a half of the sealing surface, which is less than the conventional one, it has a great sealing effect against dust and water from the outside.

Further, since the inner surface of the front cover A is covered with the elastic body to form a layer structure as described above, damping is extremely high, and the elastic body can change all its resonance points and frequency characteristics due to internal loss. It greatly reduces the generation of vibration and mechanical noise.

[Example] In order to integrate the flange portion 1 and the cover portion 2,
In addition to the method in which the cover portion 2 is directly vulcanized and molded to the flange portion 1 to achieve the connection, there are many methods such as forming both members 1 and 2 in advance and using an adhesive agent or fastening with a fastening tool. There are methods, and it is also possible to implement a shape in which the fixing is made firm, for example, by forming the mounting portion into a concavo-convex shape capable of engaging with each other as shown in FIG.

At this time, when strong rigidity is required for the cover part 2, a reinforcing plate having sufficient strength such as a metal plate, a wire mesh, a perforated plate, a composite plate of a metal plate and a synthetic resin material as shown in FIG. A strong structure can be obtained by inserting 5 by adhesive bonding or molding and bonding.

[Effects of the Invention] As described above, the present invention can be easily molded and integrated, has good vibration damping and soundproofing, and has an integrated structure including the gasket 3, which is excellent in assembling workability. It was a pricey front cover.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing a mounted state of a front cover of the present invention. A ... Front cover 1 ... Flange part, 2 ... Cover part, 3 ... Gasket, 4 ...
Block part, 5 ... Reinforcement plate

Claims (2)

[Scope of utility model registration request] 1. A front cover A that surrounds a timing drive portion of an engine; the front cover A is composed of a flange portion 1 made of a metal material and a cover portion 2 made of an elastic body, and an elastic body of the cover portion 2. The front cover is characterized by being extended to the flange portion 1 and integrated with the gasket 3. 2. The cover 2 made of the elastic body has a metal plate,
The front cover according to claim 1, wherein a reinforcing plate 5 such as a wire net, a perforated plate, or a composite plate of a metal material and a synthetic resin material is inserted.