JPH0343672A - Ignition type distributor cap and distribution - Google Patents

Abstract

PURPOSE:To prolong a life time and enhance the reliability by using resin which is made of alloyed polypropylene and polyamide resin and high pressure proof insulation resin in an ignition type distributor cap made of the high pressure proof insulating resin. CONSTITUTION:In an ignition type distributor cap made of high pressure proof insulation resin, resin which is made of alloyed polypropylene and polyamide resin is used as the high pressure proof insulation resin. Consequently, a life time of the cap is extended so as to improve reliability. In a distribution rotor for an internal combustion engine where an electrode member is half buried in an distribution rotor of synthetic resin including electrically insulative inorganic material, diarylphtalate resin is used as the synthetic resin. Consequently, heatproof strength of the rotor is improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The invention of claim 1 relates to an ignition-type power distributor cap, which is an ignition-type power distributor that has significantly improved m-impact strength, 2-dimensional stability, heat distortion temperature, etc. Regarding the cap.

The invention according to claim 2 relates to a power distribution rotor used in a power distribution device of an internal combustion engine, and particularly has excellent heat resistance strength.

The present invention relates to the power distribution rotor having good dimensional stability.

[Conventional technology]

Conventional caps for ignition type power distributors (Japanese Unexamined Patent Publication No. 60-14939) are made of polypropylene, polybutylene terephthalate, etc., with particular emphasis on the workability of injection molding and the electrical insulation properties of the molded product. Good foot.

A power distribution rotor used in a power distribution device for a spark-ignition multi-cylinder internal combustion engine is required to have high electrical insulation properties and is desired to be suitable for mass production. From this point of view, as a recent known technology,
An example of this is the No. 9 power distribution rotor. In the above technology, a thermoplastic resin such as polypropylene or polybutylene terephthalate mixed with inorganic powder has been used with emphasis on workability during injection molding and electrical insulation of the molded product.

These conventional power distribution rotors have met the requirements regarding electrical insulation and heat resistance strength under general operating conditions of conventional spark ignition internal combustion engines.

[Problem to be solved by the invention]

In the prior art related to the invention of claim 1, polypropylene is mainly used as the resin, and there is a sufficient track record in the market. However, recent advances in automotive technology have created a need for resins that can withstand high temperatures.

It is an object of the invention of claim 1 to obtain a cap for a ignition type power distributor that satisfies the above-mentioned requirements in terms of materials, extends the life of the cap for a ignition type power distribution device, and is reliable.

As automobile technology continues to advance, power distribution rotors are required to withstand high-speed operation under high temperatures, and resins with heat-resistant strength are required as materials.

The conventional power distribution rotor according to the invention of claim 2 has no margin for severe temperature conditions and load conditions, for example, 15
When performing high-speed operation tests at high temperatures such as 0° and 4,500 to 6,500 r/lll1n, the synthetic resin part near the tip of the rotor electrode where the spark discharges may melt, or in the worst case, cracks may occur in the synthetic resin part. This led to the phenomenon of damage, making it difficult to obtain sufficient reliability.

It is an object of the invention as claimed in claim 2 to solve these problems and provide a power distribution rotor that has superior heat resistance and strength compared to conventional power distribution rotors.

[Means to solve the problem]

The object of the invention of claim 1 is to provide a cap for an ignition type power distributor molded using a thermoplastic resin having electrical insulation properties, by forming a polymer alloy of polypropylene and polyamide resin as the thermoplastic resin, and using the same. achieved.

It is also an object of the present invention to provide a power distribution rotor for an internal combustion engine, which is formed by molding electrode members half-embedded in a synthetic resin kneaded with inorganic powder having good electrical insulation. This is achieved by using diallyl phthalate resin, which is a thermosetting resin having a temperature.

[Effect]

Regarding the invention of claim 1, alloying has the effect of compensating for the defects of each resin. In this case, it is a resin that inherits the advantages of polypropylene as it is, and also has the advantages of polyamide resin, such as dimensional stability, impact strength, and heat distortion temperature. In particular, it is a glass fiber reinforced plastic that uses glass fiber as reinforcement for the resin. This is because polyamide resin has two functional groups (amino group, carboxyl group) at the end of the molecule, and has excellent interfacial adhesion.
This is particularly because glass fibers have a reinforcing effect. or,
Used as a Milan coupling agent to strengthen the bond between resins and reinforcing agents.

Generally known organic silicones, titanates, etc. can be used.

Regarding the invention of claim 2, as a result of conducting various studies to manufacture a power distribution rotor for use in a power distribution device for an internal combustion engine installed in an automobile that requires high-speed operation under high temperatures, It has been found that it is quite difficult to manufacture a power distribution rotor with sufficient reliability using conventional thermoplastic synthetic resins.

Therefore, as a result of conducting various research to find a molding material for power distribution rotors that has sufficient reliability, we found that it is a thermosetting material that does not melt even under harsh temperature conditions, has a high heat distortion temperature, and has high heat resistance strength. The inventors have discovered that by using diallyl phthalate resin, which is a thermoplastic resin, it is possible to manufacture a power distribution rotor for a power distribution device that requires high-speed operation at high temperatures.

In this case, reinforcing agents to be added to the diallyl butarate resin include talc, mica, silica, glass fiber, alumina, zircon, etc., but are not particularly limited thereto.

[Example] An example of the invention of claim 1 will be described in more detail below, but the present invention is not limited to these examples.

Examples 1 to 3 and Comparative Example 1 In the examples shown in Table 1, an alloyed resin of polypropylene and polyamide was used as the molding resin for the cap for an ignitable power distribution device, and a resin containing glass fiber as a reinforcing agent was used. This is an example using a composition. The comparative example shown in Table 1 is a resin composition in which polypropylene is blended with talc as a reinforcing agent as a molding resin for a cap for an ignitable power distributor.

In the case of the examples, the amount of the reinforcing agent was increased to the limit that would allow sufficient work during molding in anticipation of the reinforcing effect of the resin. In the comparative example, the blending amount was fixed to the conventional proven blending amount.

The molding method used was a conventional injection molding machine that molded thermoplastic resin.

The caps for ignitable power distributors using the resin compositions of Examples 1 to 3 had less dimensional shrinkage in the molding machine and had improved impact strength and heat distortion temperature.

On the other hand, the ignition type power distributor cap using the resin composition of the comparative example had lower dimensional change in molding machine, impact strength, and heat distortion temperature than the resin composition.

The invention of claim 2 will be explained in more detail with examples,
The present invention is not limited to these in any way.

Examples 1 to 3 and Comparative Examples 1 to 2 In each of the examples shown in Table 2, the synthetic resin for molding the power distribution rotor was prepared by adding fillers such as glass fiber, talc, and silica to diallyl phthalate resin, which is a thermosetting resin. This is an example using a resin composition containing the following. The comparative example shown in Table 2 is a comparative example in which a resin composition in which talc and glass fiber are blended with thermoplastic resins polypropylene and polybutylene terephthalate is used as a molding resin for the power distribution rotor.

In the case of the examples, the amount of the filler was increased to the limit that would allow sufficient work during molding in anticipation of the reinforcing effect of the resin. In the comparative example, the blending amount was fixed to the conventional proven blending amount.

Regarding the molding method, diallyl phthalate resin, which is a thermosetting resin, was also molded using an injection molding machine that conventionally molded thermoplastic resins such as polypropylene and polybutylene terephthalate.

Each power distribution rotor using each resin composition of Examples 1 to 3 was 150 @, 4500 to 6500 r/+*in, 10
We conducted high-temperature, high-speed operation tests for hours, and in all cases, no abnormal phenomena such as melting cracks or breakage of the resin were observed, and very good results were obtained in which normal power distribution function was maintained.

On the other hand, as a result of testing the power distribution rotors using the resin compositions of comparative examples under the same conditions, melting of the resin and occurrence of cracks were observed in all of the power distribution rotors.

〔Effect of the invention〕

According to the invention of claim 1, it is possible to compensate for the defects of each resin, and therefore, it is possible to make a significant improvement compared to using only the resin, thereby extending the life of the ignition type power distribution device cap and improving its reliability. effective.

Claims (1)

[Scope of Claims] 1. An ignitable power distributor cap made of a high voltage insulating resin, characterized in that the high voltage insulating resin is an alloyed resin of polypropylene and polyamide resin. 2. A power distribution rotor for an internal combustion engine in which electrode members are partially embedded in a power distribution rotor body made of a synthetic resin containing an electrically insulating inorganic material, wherein the synthetic resin is diallyl phthalate resin. distribution rotor.