JP2640592B2 - Manufacturing method of resin oil gauge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to an oil level gauge for measuring an oil level of a general-purpose engine used as a drive source of a mower or a generator, or an oil of an automobile transmission. Oil level gauge).

[0002]

2. Description of the Related Art As shown in FIG. 2, this type of oil level gauge 10 comprises a lid portion 1 provided with a screw portion 3 and a grip portion 2, and a shaft portion 4, and a tip portion of the shaft portion 4 has In general, a scale 6 for measuring the oil level is formed. The material used for the oil level gauge 10 may be a material made entirely of a heat-resistant synthetic resin, or a material made of a synthetic resin for the lid portion 1 and a metal such as steel for the shaft portion 4.

[0003] Conventional methods of manufacturing oil level gauges include: a. When the whole is made of resin: i) Although not shown, a method of integrally forming the entire gauge including a scale for measuring the oil level by injection molding, and ii) As shown in FIG. The lid portion 1 provided with the grip portion 2 and the shaft portion 4 are separately formed, and the base large-diameter portion 4a of the shaft portion 4 is inserted into the connection hole 20 provided in the lid portion 1 and bonded. There is a method of bonding with an agent. B. When the shaft portion is made of metal: iii) As shown in FIG. 5, the metal round bar 21 is cut into a predetermined length (FIG. 5 (a)). 2 at the base end of the round bar 21
The groove 22 is processed (FIG. 5B). The tip side of the round bar 21 is flattened by press molding, and at the same time, a scale 23 for oil level measurement is engraved (FIG. 5 (c)). With the base end (the groove 22 processed portion) of the round bar 21 inserted into a mold (not shown), the lid portion 1 provided with the screw portion 3 and the grip portion 2 is formed of synthetic resin, and integrated. (FIG. 5D).

As a prior art, Japanese Utility Model Publication No. 43-25 / 1986
No. 516 discloses a level gauge.

[0005]

However, the above-mentioned conventional manufacturing method has the following disadvantages.
In the method i) above, even when an oil level gauge is manufactured in which only the grip portion is common and only the length of the shaft portion, in other words, the position of the scale for oil level measurement is different, the mold for resin molding is used. Will be needed. Therefore, every time the position of the scale changes, the mold must be replaced, which complicates the work, and in addition, many types of molds must be stored until the end of the spare parts. Management is difficult. In particular, recently, there is a tendency to require a large variety of small-quantity production, which is difficult to cope with.

In the method ii), the temperature of the engine oil usually rises to 100 ° C. or higher, but the amount of the adhesive that maintains the adhesive force even in such a high-temperature environment is small.
In addition, the usable synthetic resin material is limited in relation to the adhesive, and in addition, poor adhesion may occur and the shaft portion may come off from the lid portion.

In the method iii), the production of the shaft portion is troublesome, and the production cost is increased.

The present invention has been made in view of the above points, and is suitable for the production of various kinds of oil level gauges having different lengths of a shaft portion, and the number of molds is minimized.
It is an object of the present invention to provide a method of manufacturing an oil level gauge that is easy to maintain and can manufacture at low cost.

[0009]

In order to achieve the above object, the manufacturing method of the present invention comprises the steps of: (a) connecting a lid portion provided with a screw portion and a grip portion and a shaft portion with a heat-resistant synthetic resin material; (B) cutting the tip side of the shaft portion as necessary to adjust the length of the shaft portion, and, at the tip portion of the shaft portion, a scale for oil level measurement Alternatively, it is stamped by a hot stamping machine.

Further, when the scale is marked by a hot stamping machine, it is also possible to color the scale with a color different from the material of the shaft portion.

[0011]

According to the manufacturing method of the present invention having the above structure, the component (a) prevents the shaft portion from coming off the lid portion, and eliminates the need to integrate the two portions with an adhesive or the like. In addition, the type of the synthetic resin is not limited in relation to the adhesive. If the length of the shaft portion is set to the longest one of a plurality of types of oil level gauges having different lengths during molding by the component (b), the length of the shaft portion of the oil level gauge to be manufactured The length of the shaft part can be adjusted by cutting a part (unnecessary part) in accordance with the length of the shaft. At the same time or subsequently, a scale for oil level measurement is engraved on the tip of the shaft part. Is established. Therefore, a plurality of types of oil level gauges having different lengths of the shaft portion can be manufactured using a common mold.

According to the second aspect of the present invention, the scale portion is colored with a color different from the material of the shaft portion, so that the position where oil is attached can be clearly determined, and the oil level (oil level) can be measured. It will be easier. In particular, yellow dough is often used for a resin-made oil surface gauge for a general-purpose engine, and it is sometimes difficult to distinguish it from oil in the past, but this disadvantage is improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for manufacturing an oil level gauge according to the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view sequentially showing a manufacturing method according to an embodiment of the present invention, and FIG. 2 is a perspective view showing an oil level gauge manufactured by the manufacturing method of the present invention.

First, as shown in FIG. 1A, a lid portion 1 having a grip portion 2 on the outer surface side and a screw portion 3 on the inner surface side,
The shaft portion 4 having a square cross section is integrally molded with a heat-resistant synthetic resin material by injection molding using a mold (not shown) to produce an oil level gauge material 5. The oil level gauge material 5 has a solid structure as a whole, and the length of the shaft portion 4 is adjusted to the longest of a plurality of types of oil level gauges 10 (FIG. 2) having different lengths. For heat-resistant synthetic resin materials,
Nylon (polyamide resin), glass fiber mixed with nylon, phenolic resin, and other resins are used. The oil level gauge material 5 is usually colored yellow so that the oil injection position can be easily determined.

A large amount of the above oil level gauge material 5 is manufactured in advance, and the leading end of the shaft portion 4 is cut by a press machine (not shown) in accordance with the length of the oil level gauge 10 (FIG. 2). At the same time, the scale 6 for measuring the oil level is engraved with the tip of the cut shaft portion 4 slightly flattened (FIG. 1B). Note that the flattening and engraving of the scale 6 are usually performed by a cold press. Also, flattening of the tip of the shaft portion 4 and cutting for adjusting the length,
There is no particular limitation on the order of the three steps of and the marking of the scale 6, and for example, a method of performing the steps simultaneously, performing the steps after performing the steps simultaneously, and performing the steps after the steps simultaneously, etc. There is.
The scale 6 includes a high level H and a low level L as shown in FIG. 1 (b), and an uneven surface (gauge surface) which is alternately inclined in an oblique direction between the two levels. Attach. Thus, the oil level gauge 1 shown in FIG.
However, the structure of the oil level gauge 10 itself is conventionally known.

FIG. 3 is a perspective view sequentially showing a manufacturing method according to another embodiment of the present invention. FIG. 3A is common to FIG. 1A, and the oil level gauge material 5 is manufactured in the same manner as in the above embodiment. Subsequently, as shown in FIG. 3B, the distal end side of the shaft portion 4 is cut in accordance with the length of the oil level gauge 10 (FIG. 2).

Next, a scale 6 is engraved on the tip of the cut shaft portion 4 by a hot stamping machine (not shown), and is distinguished from oil by a color different from the fabric color (yellow) of the shaft portion 4. An easy color (for example, gray) is colored (FIG. 3C). The marking and coloring of the scale 6
This is performed while simultaneously applying pressure in a state where the resin is heated to the deformation temperature of the resin. Thus, the oil level gauge 11 in which the scale 6 is colored with a color different from that of the shaft portion 4 is manufactured.

[0019]

As apparent from the above description,
The oil level gauge manufacturing method according to the present invention has the following effects.

(1) After forming various kinds of oil level gauges having a common lid portion and a different shaft portion length by using a common mold, the length of the shaft portion is adjusted and a scale is marked. Therefore, the type and number of molds can be minimized, and the maintenance and management thereof are easy.

(2) Suitable for low-volume production of many kinds and can be manufactured at low cost.

(3) In the manufacturing method according to the second aspect, since a color different from that of the shaft portion can be colored at the graduation portion, the position where the oil is attached can be easily determined when measuring the oil level, which is convenient.

[Brief description of the drawings]

FIGS. 1A and 1B are perspective views sequentially showing a manufacturing method according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an oil level gauge manufactured by the manufacturing method of the present invention.

FIGS. 3A to 3C are perspective views sequentially showing a manufacturing method according to another embodiment of the present invention.

FIG. 4 is a perspective view showing a conventional oil level gauge, showing a state before a shaft portion is bonded to a lid portion.

5 (a) to 5 (d) are perspective views sequentially showing a method of manufacturing a conventional oil level gauge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cover part 2 Gripping part 3 Screw part 4 Shaft part 5 Gauge material 6 Scale 10.11 Oil level gauge

Claims (2)

(57) [Claims] A lid portion having a screw portion and a grip portion;
The shaft portion is integrally molded from a heat-resistant synthetic resin material, and the tip of the shaft portion is cut as necessary to adjust the length of the shaft portion. A method for producing a resin-made oil level gauge, wherein a scale for level measurement is stamped by a press machine or a hot stamp machine. 2. The method for manufacturing a resin-made oil level gauge according to claim 1, wherein, when the scale is stamped by a hot stamping machine, a color different from the material of the shaft portion is colored at the scale portion.