A ceramic resistance type universal engine spark plug cap

Abstract

The invention discloses a spark plug cap of a ceramic resistance type universal engine. A main tube spring (2) and a conductive cap (3) are arranged in a main tube (1a); a branch tube spring (4), a resistor ( 5) and a screw (6) are sequentially arranged in a branch tube (1b); the resistor (5) consists of a ceramic bar (5a) and metal caps (5b); the metal caps (5b) sleeve two ends of the ceramic bar (5a); a closed end of each metal cap (5b) is recessed towards the direction of the ceramic bar (5a) so that a groove (5c) is formed; the bottom wall of the groove (5c) clings to a corresponding end surface of the ceramic bar (5a); and an end of the branch tube spring (4) extends in the groove (5c) in one end of the ceramic bar (5a). On the one hand, the spark plug cap can be assembled at normal temperature, an operator is prevented from being scalded, residues in a body can be cleaned easily, and poor conduction of a product can be effectively prevented; and on the other hand, the area of portions, which are in contact with the branch tube spring and the screw, of the resistor is large, the contact performance is high, and the conduction performance can be improved further.

Description

technical field [0001] The invention relates to an engine component, in particular to a ceramic resistance spark plug cap on a general engine. Background technique [0002] The ceramic resistance spark plug cap is an important part of the general engine, and is used to connect the high voltage line and the spark plug. Its quality directly affects the starting performance of the general engine. Chinese patent ZL 200820098167.6 disclosed a spark plug cap for a general-purpose engine on March 18, 2009. A main pipe spring, a retaining spring and a conductive cap are installed in the main pipe of the body, and branch springs, resistors and screws are installed in the branch pipe of the body. The above structure The disadvantages are: [0003] 1) The conductive cap is fixed in the main tube of the main body by interference fit, which is inconvenient to disassemble and assemble, and the assembly efficiency is low; [0004] 2) The screw has a round head structure, which must be as...

AI Technical Summary

Problems solved by technology

[0003] 1) The conductive cap is fixed in the main tube of the main body by interference fit, which is inconvenient to disassemble and assemble, and the assembly efficiency is low;

[0004] 2) The screw has a round head structure, which must be assembled at a high temperature in a hot state (about 150°C). After cooling, the screw can not rotate in the branch pipe; not only that, but the assembly of other parts is also carried out in a hot state. On the one hand, the assembly The process is complicated, the assembly operation is inconvenient, and the operator is easy to burn his hands; on the other hand, the residue in the body is not easy to clean up, which may easily cause poor conduction of the product;

[0005] 3) One end of the resistor is in contact with the branch spring, and the other end is in contact with the screw. The contact performance between the end surface of the resistor and the screw is not good, and there may be no conduction; at the same time, the contact surface between the resistor and the branch spring is small, and the positioning of the branch spring is limited. Poor reliability, prone to skewing, resulting in poor continuity between branch spring and resistor

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