JPS5850125Y2 - piston cup - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a piston cup that prevents liquid leakage from a cylinder.

This type of piston cup has a lip that slides into contact with the cylinder circumferential surface by being pressed by a spring, coming into contact with the end surface of the piston, and being elastically deformed. attached,
A filler cup made of a rigid body with a predetermined shape that allows the piston cup made of an elastic body to come into contact with the piston end face and cylinder surface with a gap by the pressing force of a spring, or a filler cup that is fitted into a circumferential groove formed at the piston end. Various types have been proposed, including one in which the lip portion is elastically deformed and slides into contact with the cylinder circumferential surface.

The present invention relates to an improvement of a mold in which a filler cup is disposed on the back side of the piston cup.

This type of filler cup reduces the volume inside the cylinder by that amount, and since it is a rigid body, there is almost no deformation. In particular, brake devices in which the foil cylinder is arranged so that the cylinder axis is perpendicular have various advantages such as being able to carry out air bleeding in a suitable manner. Since the cup and filler cup are independent parts made of different materials, it is currently mandatory to replace these piston cups during vehicle inspections at regular intervals, which makes the work complicated and can lead to incorrect assembly. However, as shown in Fig. 3, there are many difficulties in assembling the piston cup 1 or filler cup 8, such as the risk that they will separate and tilt in the cylinder 9 due to a later impact and will no longer be able to perform their functions. there were.

In order to solve the above-mentioned drawbacks, the present applicant has developed a piston cup made of an elastic body, in which a portion of a filler made of the same material is integrally molded on the back side of the piston cup, which corresponds to a filler cup.

However, in this case, there is no risk of separation between the two, but
Since there is a difference in the required functions and properties between the (relatively soft) part that corresponds to the piston cup and the (relatively hard) part that corresponds to the filler cup, the hardness of the elastic body is There were some restrictions on the material because it was necessary to create a value that satisfies the average requirements.

Therefore, the inventor of the present invention constructed a piston cup made of an elastic body and a filler cup made of a rigid body as separate members, and then integrated them when the piston cup was molded using a mold. We have developed something that completely satisfies the needs of both parties.

Similarly, in the present invention, in a piston cup such as the above-mentioned elastic body having a filler part integrally molded, in order to increase the hardness of the filler part, the deformation of the piston cup is restrained by this filler part. The same effect is obtained by covering a rigid body.

To explain the present invention together with the rigid filler cup integrated type shown in FIG.
1 shows a piston cup, and the piston cup 1 shown in FIG. 1 is one in which a piston cup part 3 made of an elastic body and a filler cup part 4 made of a rigid body are integrated, and the piston cup 1 of the present invention shown in FIG. The piston cup 2 has a filler portion 5 integrally molded with the piston cup portion 3 as an elastic body, and a covering rigid body 6 is integrally attached to the back surface of the filler portion 5.

These can be easily integrated by placing the covering rigid body 6 made of a rigid body in a predetermined mold, then injecting the elastic body and molding the mold.

As mentioned above, the piston cup according to the present invention retains all the advantages of the conventional piston cup made of an elastic body and a filler cup made of a rigid body, and moreover, it is a single component. Therefore, the assembly becomes easy, and the assembly has the effect of greatly reducing the risk of filing a notification due to subsequent separation and tilting, and the practical benefits thereof are extremely large.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view of a piston cup showing a comparative example;
The figure is a vertical cross-sectional view of a piston cup showing an embodiment of the present invention, and FIG. 3 is a diagram showing a conventional example in which the piston cup is assembled in an abnormal state. 1.2... Piston cup, 3... Piston cup part, 4... Filler cup part, 5
・・・・・・Filler part) 6・・・・・・Coated rigid body, I
... Piston cup, 8 ... Filler cup, 9 ... Cylinder, 10 ...
Piston, 11... Pressing spring.

Claims (1)

[Scope of utility model registration request] A piston cup made of an elastic material whose front surface abuts the piston end face and whose outer peripheral surface slides on the cylinder peripheral surface, and a piston cup made of the same material as the piston cup and integrally molded on the back side of the piston cup, and a pressure spring. a part of the filler provided with a seat; and a covering rigid body that restrains deformation of the part of the filler that is integrally fixed to the part of the filler including the dust when the piston cup part and the part of the filler are molded together. A piston cup characterized by comprising: