JPH04136364U - Patsukin - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the wear resistance of the resin ring by reducing friction and suppressing the increase in friction due to changes over time in a packing configured by combining a rubber-like elastic ring and a resin ring. It is possible. [Structure] The sliding surface 61 of the resin ring 6 is opened on the fluid side to be sealed, and a slit 7 that does not penetrate in the axial direction is provided to improve lubricity.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to packing used in various hydraulic cylinders, etc., and is particularly applicable to rubber packing. The present invention relates to a type of packing that combines a rubber-like elastic ring and a resin ring.

0002

[Conventional technology]

As a conventional packing of this kind, there is one shown in FIG. 6, for example. vinegar That is, this packing 100 is installed in the mounting groove 102 on the outer periphery of the piston 101. Thus, the gap between the piston 101 and the cylinder 103 is sealed.

0003 The packing 100 is in slidable and sealed contact with the inner peripheral surface of the cylinder to form a sealed sliding surface. The resin ring 104 and the back of the sealing sliding surface 106 of this resin ring 104 Rubber bullets assembled on the surface side to apply sealing pressure to the sealing sliding surface 106 It is composed of a ring 105 made of a synthetic body.

0004

[Problem that the idea aims to solve]

In the case of such a packing, when trying to reduce friction, the cylinder 103 The resin ring 104 in contact with the inner peripheral surface is made of a resin material with a small coefficient of friction. Ru. Or the surface of the sealing sliding surface 106 of the resin ring 104 against the cylinder 103 There are methods such as reducing the product.

[0005] However, as a result of a durability test, the sealing slide of the resin ring 104 was Wear of the sliding surface 106 progresses, the condition of the sealing sliding surface 106 changes, and the area increases. Therefore, as shown in the graph showing the change in friction over time in Figure 7, the initial friction is low. It is said that even with friction, as the number of durability increases, the friction increases. There was a problem with durability.

[0006] The present invention was devised to solve the above-mentioned problems of the prior art, and its purpose is to This means that the friction is low and the increase in friction due to changes over time is suppressed. The object of the present invention is to provide a packing that can improve the wear resistance of a resin ring.

[0007]

[Means to solve the problem]

In order to achieve the above object, the present invention uses a resin ring with a sealed sliding surface. and a seal attached to the back surface of the resin ring and sealed on the sealing sliding surface of the resin ring. A packing comprising a ring made of a rubber-like elastic material for applying pressure, The sliding surface of the resin ring is opened on the side of the fluid to be sealed, and does not penetrate in the axial direction. It is characterized by having a slit.

[0008]

[Effect]

In the packing with the above configuration, a sealing pair is provided in the circumferential direction on the sliding surface of the resin ring. The slit is open on the fluid side and does not penetrate in the axial direction. The fluid to be sealed is stored in the tank, providing a lubricating effect. Therefore, the resin ring The abrasion resistance is improved, and an increase in friction can be suppressed.

[0009]

【Example】

The present invention will be explained below based on the illustrated embodiments. A package according to an embodiment of the present invention In FIGS. 1 to 5 showing the packing, 1 indicates the entire packing, and this embodiment Similarly to the conventional example, between the cylinder 2 and the piston 3, which are assembled so that they can freely reciprocate, This will be explained using an example of sealing.

0010 That is, the packing 1 is installed in the mounting groove 4 formed on the outer periphery of the piston 3. , in slidable and sealed contact with the inner circumferential surface of cylinder 2, and cylinder 2 and piston This seals the space between the two cylinders.

[0011] This packing 1 is constructed by combining a ring 5 made of rubber-like elastic material and a ring 6 made of resin. The outer periphery of the resin ring 6 is slidably close to the inner periphery of the housing 2. , the rubber-like elastic ring 5 is located on the back side of the resin ring 6, and is attached to the outer periphery of the rod 3. In this state, they are combined and mounted in the formed mounting groove 4.

0012 The mounting groove 4 formed on the outer periphery of the rod 3 has a rectangular cross-section, for example, and is attached to the housing. It is assumed that the ring 2 side is open.

[0013] The ring 5 made of rubber-like elastic material is an annular member with a circular cross section, and its width is smaller than the width of the mounting groove 4. It is attached to the bottom of the mounting groove 4.

[0014] The inner circumference of the resin ring 6 is in contact with the outer circumference of the rubber-like elastic ring 5, and the width is It is larger than the width of the rubber-like elastic ring 5 and slightly smaller than the mounting groove 4. In addition, the inner circumference is a straight cylindrical surface in the axial direction, and the outer circumference has approximately half of the outer circumferential surface in the axial direction. It is a cylindrical surface that is straight in the direction, and makes slidable and sealed contact with the inner circumference of cylinder 2. It is a sealed sliding surface 61, and the sealing is performed from the end of the sliding surface 61 on the fluid side O to be sealed. An inclined surface 62 is formed so that the diameter gradually decreases in the radial direction toward the target fluid side O. ing. The edge of the sealing sliding surface 61 on the atmosphere side is rounded.

[0015] In addition, approximately in the center of the outer peripheral surface of the resin ring 6, there are 12 slits equally spaced in the circumferential direction. 7 is provided. This slit 7 has an elongated elliptical appearance and its major axis is axial. towards. In addition, when viewed in cross section, this slit 7 has an inclined surface 6 on the cylinder 2 side. 2. The end on the side of the fluid to be sealed is opened from the middle, and the sliding surface 61 is axially directed toward the atmosphere side A. It is formed so that it does not penetrate the sealing sliding surface 61. .

[0016] In the packing with the above configuration, the fluid such as oil on the side O of the fluid to be sealed is It flows into the slit 7 through the inclined surface 62 provided on the ring 6, and flows into the inner circumference of the cylinder 2. and the slit 7, and due to the fluid such as oil, the piston 3 A lubricating effect that can reduce the friction of the sealing sliding surface 61 during reciprocating movement of the It will be done. Therefore, wear on the sliding surface 61 of the resin ring 6 can be reduced, Improves wear resistance. Further, it is also possible to suppress an increase in friction.

[0017] Here, the packing 1 using the resin ring 6 of this embodiment and the resin ring 6 of the conventional example are compared. The results of a durability test comparing packing 1 using packing 104 will be explained.

[0018] First, Table 1 below shows the test conditions for this test.

[0019]

[Table 1] In addition, as shown in FIGS. 1 and 6, in the samples of this test, the dimensions of the resin ring 6 of this embodiment and the resin ring 103 of the conventional example are such that both resin rings 6 and 103 have a thickness T= 1.1 mm, width W = 1.7 mm, the length L1 from one end of the outer peripheral surface to the inclined surface 62 is the target value L1 = 0.9 mm, the length L2 of the sealing sliding surface 61 is the target value L2 = 0 .6mm.

[0020] Further, the dimensions of the slit 7 provided in the resin ring 6 of this embodiment are length SL=0 ．． 6 mm, width SW=0.1 mm, and depth SD=0.3 mm.

[0021] Figure 2 shows the test equipment. That is, multiple pressure introduction holes 9 are provided in the cylindrical cylinder 8. A piston 10 is inserted into the cylinder 8 in a reciprocating manner, and the piston 1 0 Attachment grooves 11, 11 are formed at two locations spaced apart in the axial direction on the outer circumference, and the attachment groove 1 The sample packings 12 of this embodiment and the conventional example were installed in the samples 1 and 11.

[0022] Then, while applying a constant pressure, press in the pushing direction shown by the solid line arrow and the broken line arrow in the figure. The resin ring 6 of this example was moved reciprocally in the pulling direction shown by the mark, and the conventional A durability test was carried out under the test conditions shown in Table 1 above when using the resin ring 103 of the previous example. We conducted an experiment and compared the results. In this example, friction was measured during movement in the pushing direction. .

[0023] The results of the durability test are shown in FIGS. 3 and 4. Figure 3 shows the change in friction (Fr) over time. This is a graph showing the reciprocation of the piston 10 up to 200,000 times. This shows an increase in friction (Fr). The curve W connecting the white circles in the figure is the resin of this example. The curve B connecting the black circles shows the results when using the resin ring 6 of the conventional example. This is the result when using 103, and this example has a higher friction than the conventional example. The increase in friction is reduced by approximately 50%, and the increase in friction due to changes over time is suppressed. was completed.

[0024] Moreover, FIG. 4 shows the amount of wear on the sliding surfaces 61, 106 of the resin rings 6, 103. This is a graph, and the white bar graph W is the result when using the resin ring 6 of this example. , black bar graph B is the result when using the conventional example resin ring 103, and the actual result In this example, the amount of wear is reduced by approximately 35% compared to the conventional example, and the wear resistance of the resin ring 6 is improved. improved.

[0025] Another embodiment of the invention is shown in FIG. In the above embodiment, the slit 7 is Although the packing 1 is provided in only one direction, in this embodiment, the packing 1 has a shape that loses its directionality, so to speak. The slit 7 is provided from both directions in a left-right symmetrical shape in the direction of the axis. . Other configurations and functions are the same as in the first embodiment, so the same components are used. The same reference numerals are given to the same reference numerals, and the explanation thereof will be omitted.

[0026] In each of the above embodiments, the mounting groove 4 is formed on the outer periphery of the piston 3. The explanation was given using an example with packing 1 installed, but there is a mounting groove on the inner circumference of cylinder 2. The same can be applied to the case where the packing 1 is attached to the packing 1. .

[0027]

[Effect of the idea]

The present invention has the above-described structure and function, and has a sliding surface on the sliding surface of the resin ring. Since the slit is provided, a lubricating effect can be obtained by the slit portion. Therefore the tree The abrasion resistance of the sliding surface of the grease ring has been improved compared to conventional technology, and it has been improved in continuous use. It is possible to suppress an increase in friction.

[Brief explanation of drawings]

FIG. 1 shows a packing according to an embodiment of the present invention; FIG. 1(a) is a partial top view of the packing, and FIG. 1(b) is a longitudinal sectional view of a main part of the packing.

FIG. 2 is a sectional view showing a schematic configuration of a friction test device.

FIG. 3 is a graph showing a comparison of the friction test results of the conventional example and the present invention.

FIG. 4 is a graph showing a comparison of the amount of wear on the sliding surfaces of the resin rings of the conventional packing and the packing of the present invention.

FIG. 5 shows a packing according to another embodiment of the present invention, in which FIG. 5(a) is a partial top view and FIG. 5(b) is a longitudinal sectional view of the main part.

FIG. 6 is a vertical cross-sectional view of a main part of a conventional packing.

FIG. 7 is a graph showing the change in friction of the resin ring shown in FIG. 6 over time.

[Explanation of symbols]

1 Packing 2 Cylinder 3 Piston 4 Mounting groove 5 Rubber-like elastic ring 6 Resin ring 61 Sealing sliding surface 62 Inclined surface 7 Slit 8 Cylinder 9 Pressure introduction hole 10 Piston plunger 11 Mounting groove 12 Sample packing A Atmospheric side O Sealing Target fluid side T Thickness of the resin ring W Width of the resin ring L1 Target value of the length from one end of the outer peripheral surface of the resin ring to the inclined surface L2 Target value of the length of the sealing sliding surface SL Length of the slit SW Slit width SD Slit depth B Results of conventional example W Results of this example

Claims (1)

[Scope of utility model registration request] 1. A resin ring having a sealing sliding surface; a rubber-like elastic ring attached to the back surface of the resin ring for applying sealing pressure to the sealing sliding surface of the resin ring; A packing comprising: a slit in the sliding surface of the resin ring that opens on the side of the fluid to be sealed and does not penetrate in the axial direction.