JPH0651592U - Link plate for chains with markings made by laser beam - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a chain link plate which is marked without impairing its strength. [Structure] Mark 26 attached to link plate 25
Are marked with a laser beam. The mark 26 marked by the laser beam is 2 to 4
The link plate 25 is baked at a depth of micron. Therefore, the link plate 25 does not lose its strength unlike the one that is marked by the conventional marking method.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a chain link plate having a manufacturer's logo mark, a country of manufacture, a product number, etc. (hereinafter referred to as "marking").

[0002]

[Prior art]

 Conventionally, for example, a manufacturing country name 12 is often engraved on the outer surface of the central portion in the longitudinal direction of the pin link plate of the chain, for example, as shown in FIG. In addition to the country of manufacture, the manufacturer's logo or product number may be engraved. The marking by such marking is performed by hitting the marking with a hammer or by a marking machine, and the marking is usually cut into the pin link plate 11 at a depth of about 0.2 to 0.4 mm. At the time of this marking, the pin link plate 11 receives an impact force.

[0003]

[Problems to be solved by the device]

 However, the chain pin link plate 11 in which the marking is performed by the conventional marking method has the following problems. (1) When the chain 10 is used, a load acts on the pin link plate 11 in a direction in which both longitudinal ends bend outward, as shown in FIG. For this reason, in the pin link plate 11, stress concentrates on the engraved portion, but since the engraved portion is a kind of notch, there is a risk of fatigue fracture from that portion and fracture. (2) It may be deformed by the impact force received during marking. (3) In the case of mark king that uses a hammer, the marking work requires time and effort.

[0004]

[Means for Solving the Problems]

 The present invention solves the above problems by a chain link plate having markings made by laser beams.

[0005]

[Action]

 The markings made by the laser beam are shallower than before and have less impact and heat effect, and are printed on the link plate.

[0006]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. The chain 20 is a timing chain incorporated in a power transmission mechanism that transmits the rotational force of an output shaft 31 of an automobile engine to shafts 32, 32 that open and close an engine valve (not shown). The chain 20 is composed of pins 21, bushes 22, rollers 23, roller link plates 24, and pin link plates 25.

The country of manufacture 26 is marked with a laser beam on the outside of the center of the pin link plate 25 in the longitudinal direction. In addition to the name of the country of manufacture, it may be the manufacturer's logo mark, product number, etc. Further, a timing mark, which serves as a mark for assembling the chain 20 by aligning the position of the piston of the engine with the position of the engine valve, may be provided. Note that the technology itself for marking with a laser beam is well known and is not the gist of the present proposal, so description thereof will be omitted.

The pin link plate of the chain marked with the laser beam has the following advantages. (1) The marking depth by the conventional engraving method is about 0.2 to 0.4 mm, but the marking depth by the laser beam is as shallow as about 2 μm to 4 μm, and stress concentration and thermal influence are unlikely to occur. (2) Since the marking depth is shallow, it is possible to obtain a high-strength chain without increasing the thickness. (3) Unlike marking by the engraving method, it does not receive impact force, so the link plate is less likely to deform. (4) The marking work time is shortened compared to the hammering work. The marking time is about 2 to 6 seconds, though it depends on the shape of the marking, the number of symbols, and other factors. (5) Since no impact force is applied during marking, the pin link plate 25 can be marked even in the final assembly step of the chain. The roller link plate 24 may be marked.

[0009]

[Effect of device]

 The link plate of the present invention has the following effects. (1) Since the depth is shallower than the conventional marking method, the stress concentration is less likely to occur and the strength is not impaired. (2) Unlike marking by the engraving method, it does not receive impact force, so it does not deform easily. (3) Unlike marking with a hammer, marking work can be done in a short time. (4) Since no impact force is applied, the link plate can be marked even in the final assembly step of the chain.

[Brief description of drawings]

FIG. 1 is a front view of a chain incorporating a pin link plate having markings by a laser beam according to the present invention.

2 is a plan view of the chain of FIG. 1. FIG.

FIG. 3 is a diagram of an example of use of the chain of FIG.

FIG. 4 is a plan view of a conventional chain when in use.

FIG. 5 is a front view of a pin link plate with marking.

[Explanation of symbols]

 20 chain 24 roller link plate (link plate) 25 pin link plate (link plate) 26 country name (marking)

Claims (1)

[Scope of utility model registration request] 1. A link plate for a chain, comprising a marking provided by a laser beam.