JPS6220866B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for applying grease to parts such as oil seals.

For example, in order to reduce frictional resistance and maintain airtightness, the rubber oil seals and pistons in disc brakes are coated with a thin layer of grease (for example, about 0.2 g per seal) evenly over the entire surface. There is. Conventionally, such application work was carried out by placing the grease and the parts to be greased in a plastic bag, for example, and then opening the plastic bag with the operator's hands.
Since the number of greases to be coated at one time is small and it is done manually, there is a problem in that the coating efficiency is extremely poor, and there has been a desire for a method for efficiently and automatically carrying out the grease coating operation.

This invention was made in response to the above-mentioned demands, and its purpose is to provide a grease application method that can efficiently apply grease to parts such as oil seals and can also be automated. , by placing the grease and a plurality of parts to be greased in a bag together with a large number of hard balls, sealing the bag, placing the bag together with a large number of other hard balls in a container, and rotating the container at a slow speed.
The inside of the bag is stirred by each of the hard balls.

That is, in this invention, a bag containing grease, parts, etc. and a large number of hard balls are placed in a container, and the container is rotated slowly, so that the bag and the hard balls interfere with each other irregularly, and the bag is filled with hard balls. Since the grease and the parts to be greased are placed in a bag together with a large number of hard balls, rotating the container will cause the parts inside the bag and the hard balls to mix irregularly. As a result of interference, the grease adhering to the hard balls is applied to the parts, and at the same time, the hard balls stretch the grease adhering to the parts, so that the grease can be applied uniformly and thinly to the parts.

The present invention will be described in detail below based on examples.

First, a device for implementing the method of the present invention will be described. FIG. 1 is a schematic exploded perspective view showing an example of the device, in which a rotating shaft 2 is attached to the upper end of a stand 1 so as to be freely rotatable almost horizontally. and
A pair of container holding bands 4 for attaching a polyethylene container 3 are provided at one end of the rotating shaft 2, and a sprocket 5 is attached to the other end of the rotating shaft 2. The sprocket 5 is the reducer 6
Chain 8 is attached to sprocket 7 attached to the output shaft of
Therefore, by driving the motor 9 connected to the reducer 6, the rotating shaft 2 can be slowly rotated in a predetermined direction via the reducer 6 and the chain 8. Teru.

Next, the method of this invention using the above device is as follows.
The case where grease is applied to the oil seal 10 shown in FIG. 2 will be explained as an example.

First, a predetermined number of oil seals 10, steel balls 11, and a predetermined amount of grease 12 are placed in a plastic bag 13, and the plastic bag 13 is sealed (see FIG. 3). Here, the number and size of the steel balls 11 may be determined depending on the number and size of the oil seals 10, which are the parts to which the grease 12 is applied.
However, the outer diameter is 48 mm and the thickness is 4 mm, and the number is about 1200.
In the case of using steel balls 11, 15 to 20 steel balls 11 having a diameter of about 25 mm may be used. Furthermore, since the grease 12 adheres not only to the oil seal 10 but also to the steel balls 11 and plastic bags 13, it is preferable that the amount of grease 12 to be added is experimentally determined by taking into account the amount of adhesion to the steel balls 11, etc. . Furthermore, it is preferable that the plastic bag 13 in which the oil seal 10, steel balls 11, etc. are placed has a capacity that allows the oil seal 10 and steel balls 11 to move sufficiently within it. However, a material having a certain degree of strength may also be used.

Next, the plastic bag 13 containing the oil seal 10, etc. is placed in the polyethylene container 3, and together with this, a large number of steel balls 14 are placed in the polyethylene container 3, and the polyethylene container 3 is sealed (see Fig. 4). . In this case as well, the size and number of the steel balls 14 may be determined based on the capacity of the polyethylene container 3, the size of the plastic bag 13, etc.; for example, the size and number of the oil seals 10, the size of the steel balls 11, etc. If the number etc. are set as mentioned above and the capacity of the polyethylene container 3 is about 20 liters, the diameter is 25 to 40 liters.
It is sufficient to place 10 to 20 steel balls 14 of about mm size into the polyethylene container 3.

Two polyethylene containers 3 containing a plastic bag 13 and a steel ball 14 are prepared, and each polyethylene container 3 is attached to the rotating shaft 2 with a container holding band 4 in the apparatus shown in FIG. When the motor 9 is started in this state, the polyethylene container 3 rotates together with the rotating shaft 2, and eventually the polyethylene container 3 revolves around the horizontal axis. In that case, it is preferable to rotate at a low speed of about 10 revolutions per minute. When the polyethylene container 3 is rotated in this manner, the plastic bag 13 and the steel balls 1 are
4 interfere with each other in an irregular and complicated manner, and as a result, the plastic bag 13 is torn between the steel balls 14. Accordingly, inside the plastic bag 13, the oil seal 10, the steel balls 11, and the grease 12 interfere with each other in an irregular and complicated manner. As a result, the steel balls 11 prevent not only the grease 12 from directly adhering to the oil seal 10 but also the oil seals 10 from adhering to each other due to the grease 12. 11 comes into contact with the oil seal 10,
Grease 12 is applied to the oil seal 10 via the steel ball 11, and the steel ball 11 to which no grease 12 is attached comes into contact with the oil seal 10, so that the oil seal 10
The grease 12 adhering to the oil seal 10 is stretched, and ultimately the grease 12 is applied thinly and uniformly to the oil seal 10.

Here is an example of an experiment conducted by the inventors:
Approximately 1200 oil seals with a diameter of 48 mm and a thickness of 4 mm,
Place 15 to 20 steel balls with a diameter of 25 mm and 40 g of grease for application in a plastic bag, seal it, and add steel balls with a diameter of 25 to 40 mm along with the plastic bag.
10 to 20 pieces were placed in a polyethylene container with a capacity of about 20 liters, and the polyethylene container was rotated at about 10 revolutions per minute. After about 20 minutes, the oil seal was removed and grease was evenly and thinly coated on its entire surface. In the traditional method,
It took about 10 minutes to apply grease to 200 oil seals, confirming that the above method was able to apply grease much more efficiently than conventional methods.

In the above example, the object is an oil seal, but the method of the present invention can also be applied to the case of applying grease to various parts other than oil seals. Moreover, it goes without saying that containers other than polyethylene containers can be used. Further, the rotational speed of the container may be such that the bag placed therein does not remain attached to the inner wall of the container due to centrifugal force, and does not need to be approximately 10 revolutions per minute. The hard ball in this invention is not limited to the above-mentioned steel ball, but may be, for example, a spherical body made of synthetic resin, as long as it has a mass that can overcome the viscosity of the grease.

As is clear from the above description, according to the method of the present invention, grease and a plurality of parts to be greased are sealed together with a large number of hard balls, and the bag is sealed together with a large number of other hard balls. put in,
This is a method in which the inside of the bag is stirred by each of the hard balls by rotating the container at a slow speed,
A hard ball placed in a container together with a bag containing parts to be greased will rub the bag by rotating the container, and as a result, the hard balls inside the bag will prevent the parts from adhering to each other due to grease. Therefore, according to the method of the present invention, by increasing the capacity of the bag or container, grease can be applied uniformly and thinly to many parts at the same time. As a result, it has become possible to perform grease application work much more efficiently than in the past.
Furthermore, since all you have to do is rotate the container,
It can also be easily automated.

[Brief explanation of the drawing]

Fig. 1 is a schematic exploded perspective view showing an example of an apparatus for carrying out the method of the present invention, Fig. 2 is a perspective view showing one of the oil seals to be greased, and Fig. 3 is an illustration of the oil seal to be placed in a plastic bag. The perspective view and FIG. 4 are cross-sectional views of the polyethylene container containing a plastic bag. 3...Polyethylene container, 10...Oil seal,
11, 14...Steel ball, 12...Grease,
13...Plastic bag.

Claims (1)

[Claims] 1. Grease and a plurality of parts to be greased are placed in a bag together with a large number of hard balls, sealed, the bag is placed in a container together with a large number of other hard balls, and the container is slowly rotated. Grease application method characterized by stirring the inside of the