JP2017088214A - Opening and closing member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an opening and closing member being capable of easily opening an opening portion at the time of release of the opening portion while securing airtightness of the opening portion at the time of closing thereof.SOLUTION: An opening member 1 corresponding to an opening and closing member has a sliding surface 13 on which a rubber material 23 slides. An opening portion 10 is closed in a state of the sliding surface 13 being pressed to the rubber material 23 after the rubber material 23 slides on the sliding surface 13. The sliding surface 13 is a surface formed with polytetrafluoroethylene 15 on a surface 14a of a base material 14 consisting of a non-fluorine-based resin such that a part of the surface 14a of the base material 14 is exposed. The surface 14a of the base material is exposed in a range of 20-80% of an area ratio with respect to the sliding surface 13.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an opening / closing member that has a sliding surface that slides on a rubber material, and that closes an opening in a state where the rubber material is pressed against the sliding surface after sliding on the rubber material.

  For example, an open / close mechanism including an engine oil filler cap (hereinafter referred to as a cap) and an oil injection portion (opening portion) of a head cover has been proposed. In this opening / closing mechanism, the cap can be fastened to the injection portion by screwing the inner peripheral surface of the cap to the outer peripheral surface of the oil injection portion (opening portion), and the injection portion (opening portion) can be opened and closed by the cap. (For example, refer to Patent Document 1).

  The cap is provided with a rubber material (O-ring) such as NBR at a position sliding on the opening end surface (sliding surface) of the opening, and the head cover (opening / closing member) forming the opening is made of polyamide resin or the like Made of resin. When closing the opening, the sliding surface (opening end surface) of the opening / closing member slides on the rubber material of the cap, and then the rubber material is pressed against the sliding surface. Can be occluded.

JP 2010-174631 A

  As described above, when closing the opening of the opening / closing member, after the rubber material is slid on the sliding surface of the opening / closing member, the rubber material contacts the sliding surface while pressing the sliding surface. . However, if the state in which the rubber material presses the sliding surface is maintained, the rubber material deforms with time according to the surface state of the sliding surface, and the substantial area where the rubber material contacts the sliding surface is increased. Increasing the coefficient of static friction increases. Accordingly, even if the rubber material is slid with respect to the sliding surface so as to open the opening of the opening / closing member, the rubber material does not slide easily, and as a result, the opening can be easily opened. May be difficult.

  The present invention has been made in view of these points, and provides an opening / closing member that can ensure the airtightness of the opening when closed and can easily open the opening when the opening is released. There is to do.

  In view of the above problems, the opening / closing member according to the present invention has a sliding surface on which a rubber material slides, and after the rubber material slides on the sliding surface, the sliding on the rubber material. An opening / closing member that closes the opening in a state where the surface is pressed, and the sliding surface of the opening / closing member is partially formed on a surface of a base material made of non-fluorinated resin. It is a surface on which polytetrafluoroethylene is formed so as to be exposed, and the surface of the base material is exposed in an area ratio of 20 to 80% with respect to the sliding surface. .

  According to the present invention, even when the rubber material is kept pressed against the sliding surface while the opening is closed, polytetrafluoroethylene (PTFE) is formed on the sliding surface. The static friction coefficient between the material and the sliding surface is reduced, and the opening can be easily opened.

  Here, when the surface of the non-fluorine-based resin base material is exposed in an area ratio exceeding 80% with respect to the sliding surface, the area where the rubber material contacts the surface of the base material becomes too large. The static friction coefficient cannot be sufficiently reduced by PTFE.

  On the other hand, when the surface of the base material of the non-fluorine resin is less than 20% in terms of the area ratio with respect to the sliding surface, the area where the rubber material contacts the surface of the base material becomes too small, and the rubber material and the sliding surface The coefficient of static friction is too small. Thereby, in a state where the opening is closed, the rubber material and the sliding surface are easily slid by vibration or the like, and the airtightness of the opening by the rubber material may be impaired.

It is a typical perspective view of the opening member corresponded to the opening-and-closing member which concerns on this invention, and the cap which seals this. It is typical sectional drawing which showed the state of the sliding surface of the opening member shown in FIG. It is typical sectional drawing which showed the state of the sliding surface of the opening member which concerns on the past. It is the graph which showed the result of the friction coefficient of the test piece which concerns on Example 1 and the comparative example 1 immediately after a test start (initial stage) and after leaving for 24 hours. It is the graph which showed the result of the friction coefficient of the test piece which concerns on Examples 2-6 and Comparative Examples 2-4.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic perspective view of an opening member 1 corresponding to an opening / closing member according to the present invention and a cap 20 that seals the opening member 1. FIG. 2 is a schematic cross-sectional view showing a state of the sliding surface 13 of the opening member 1 shown in FIG.

  As shown in FIG. 1, an opening 10 is formed in the opening member 1 according to the present embodiment, and the opening member 1 is a member whose opening 10 is opened and closed by a cap 20. The opening member 1 of the present embodiment corresponds to the “opening / closing member” of the present invention. On the inner peripheral surface of the cylindrical wall portion 11 that forms the opening portion 10 of the opening member 1, a female screw portion 12 that is screwed with the male screw portion 22 of the cap 20 is formed.

  In the present embodiment, when the male screw portion 22 of the cap 20 is screwed into the female screw portion 12 of the opening member 1 and the cap 20 is fastened to the opening member 1, a rubber material 23 described later attached to the cap 20. However, it slides on the sliding surface 13 which is the opening end surface of the opening 10.

  Here, the opening member 1 is formed of a non-fluorine-based resin not containing fluorine, and the sliding surface 13 is formed on the surface of a base material 14 made of a non-fluorine-based resin as shown in FIG. The polytetrafluoroethylene (PTFE) 15 is formed so that a part of the surface 14a is exposed.

  Specifically, the surface 14 a of the base material 14 is exposed in an area ratio of 20 to 80% with respect to the entire area of the sliding surface 13. The area of the sliding surface 13 is an area of a virtual surface where the sliding surface has no surface roughness, and corresponds to a ring-shaped area in the present embodiment.

  Such a sliding surface 13 is obtained by coating PTFE having a thickness of 5 μm or less on a resin surface made of a base material having a surface roughness of 10-point average roughness Rz of 10 μm or less, and polishing the coated surface. Can do. By adjusting the polishing amount, the surface 14a of the base material 14 can be exposed in an area ratio of 20 to 80% with respect to the entire area of the sliding surface 13.

  Here, as the non-fluorine resin (resin not containing fluorine) constituting the base material 14, for example, nylon 66, polyphenylene sulfide (PPS) resin, polybutylene terephthalate (PBT) resin, or polyacetal (POM) resin. And so on. The non-fluorinated resin is not particularly limited as long as it is a resin having a larger coefficient of static friction than PTFE when the rubber material 23 to be slid is pressed under the same conditions against PTFE having the same surface roughness. It is not a thing.

  The cap 20 seals the opening 10 of the opening member 1. The cap 20 is formed with a male screw portion 22 that is screwed into the female screw portion 12 of the opening member 1. A rubber material (O-ring) 23 is disposed at a portion of the cap 20 that faces the opening 10. Specifically, the rubber member 23 is formed by the fastening force of the male screw portion 22 and the female screw portion 12 in a state where the male screw portion 22 of the cap 20 is fastened to the female screw portion 12 of the opening member 1. It arrange | positions so that the sliding surface 13 which is 1 opening end surface may be pressed.

  Here, when closing the opening 10, the male screw portion 22 of the cap 20 is screwed to the female screw portion 12 of the opening member 1. When the cap 20 is tightened with respect to the opening member 1, thereafter, the rubber material 23 of the cap 20 slides on the sliding surface 13 of the opening member 1.

  When the cap 20 is further tightened with respect to the opening member 1, the rubber material 23 is compressed and deformed by the fastening force of the male screw portion 22 and the female screw portion 12, and the sliding surface 13 is pressed against the rubber material 23. Then, as shown in FIG. 2, the rubber material 23 is deformed in a state where the sliding surface 13 is pressed with the passage of time in a state where the opening 10 is closed. Thereby, the opening part 10 is obstruct | occluded with the cap 30, and the airtightness of the opening part 10 can be improved.

  Until now, as shown in FIG. 3, the sliding surface 93 has been the surface 14 a of the base material 14 made of non-fluorinated resin in which PTFE is not formed as in the present embodiment. Therefore, since the rubber material 23 is deformed in a state where the sliding surface 93 is pressed with the passage of time with the opening 10 closed, the rubber material 23 and the sliding surface 93 made of a non-fluorine resin are substantially separated. The contact area increased, and the coefficient of static friction increased.

  Thereby, even if the rubber material 23 of the cap 20 is slid with respect to the sliding surface 93 so as to open the opening 10 of the opening member 1, the rubber material 23 is easily slid with respect to the sliding surface 93. It was difficult to open the opening 10 easily without moving.

  However, in this embodiment, since the polytetrafluoroethylene (PTFE) 15 is formed on the sliding surface 13 so that the surface 14a of the base material 14 is exposed in the above-described range, the rubber material 23 and the sliding surface are formed. The coefficient of static friction with 13 is reduced. Thereby, even if the rubber material 23 is kept pressed against the sliding surface 13 in the closed state of the opening 10, the opening 10 can be easily opened.

  Here, when the surface 14 a of the base material 14 is exposed in an area ratio exceeding 80% with respect to the entire area of the sliding surface 13, the rubber material 23 of the cap 20 is used as the base material of the opening member 1. The area which contacts the surface 14a of 14 becomes large too much. As a result, the static friction coefficient cannot be sufficiently reduced by the PTFE 15, and it is difficult to open the opening 10 of the opening member 1 by sliding the cap 20.

  On the other hand, when the surface 14a of the base material 14 is exposed with an area ratio of less than 20% or more with respect to the entire area of the sliding surface 13, the area where the rubber material 23 contacts the surface 14a of the base material 14 is large. It becomes too small, and the static friction coefficient between the rubber material 23 and the sliding surface 13 becomes too small. Thereby, the rubber material 23 of the cap 20 and the sliding surface 13 of the opening member 1 are easily slid by vibration or the like in a state where the opening 10 is closed with the cap 20, and the opening 10 formed by the rubber material 23. There is a risk that the airtightness of the glass will be impaired.

  The invention is illustrated by the following examples.

[Example 1]
A plate test piece of 30 mm × 50 mm × 3 mm made of nylon 66 (PA66) was prepared as a test piece corresponding to the opening / closing member. The surface roughness of a surface of 30 mm × 50 mm corresponding to the sliding surface of the plate test piece is a ten-point average roughness Rz5 μm. This surface is coated with polytetrafluoroethylene (PTFE) having a thickness of 3 μm, and the exposed area of the surface of PA66 is 50% (specifically, 750 mm ² ) in terms of the area ratio with respect to the total area of the sliding surface. The surface was polished so that The surface roughness of the sliding surface at this time is a ten-point average roughness Rz 2.5 μm.

[Comparative Example 1]
A plate test piece was prepared in the same manner as in Example 1. The difference from Example 1 is that the surface roughness of 30 mm × 50 mm corresponding to the sliding surface of the plate test piece is changed to a ten-point average roughness Rz 2.5 μm, and PTFE is not provided on this surface.

<Sliding test 1>
As a test piece that slides on the plate test piece according to Example 1 and Comparative Example 1, a disk test piece having a diameter of 10 mm and a height of 5 mm made of rubber (NBR) was produced. The surface of the disk test piece having a diameter of 10 mm was brought into contact with the surface of the plate test piece of 30 mm × 50 mm, and the disk test piece was slid on the surface of the plate test piece. The test conditions were a load of 50 N, a sliding speed of 10 mm / s, and an amplitude of 10 mm, and engine oil was applied to the sliding surface.

  Thereafter, the load of 50 N was applied to the sliding surface and left for 24 hours, and the static friction coefficient was measured immediately after starting the test and after being left for 24 hours. The result is shown in FIG. FIG. 4 is a graph showing the results of the friction coefficients of the test pieces according to Example 1 and Comparative Example 1 immediately after the start of the test (initial stage) and after being left for 24 hours.

[Result 1]
From this result, in the case of Comparative Example 1, the static friction coefficient after 24 hours was 0.75, but in the case of Example 1, the static friction coefficient after 24 hours was 0.25. The value was lower than 1. In both cases of Example 1 and Comparative Example 1, after 24 hours, the rubber of the disc test piece is deformed, and the substantial contact area between the plate test piece and the disc test piece increases. However, in the case of Example 1, since PTFE was formed in a part of sliding surface, it is thought that the raise of the static friction coefficient was able to be suppressed.

[Examples 2 to 6]
A plate test piece was prepared in the same manner as in Example 1. Examples 2, 3, 5 and 6 differ from Example 1 in that, as shown in FIG. 5, the exposed area of the surface of PA 66 is successively 20 as an area ratio with respect to the entire area of the sliding surface. The amount of polishing of the surface was changed so as to be%, 30%, 70%, and 80%. In addition, Example 1 and Example 4 are the same.

[Comparative Examples 2 to 4]
A plate test piece was prepared in the same manner as in Example 1. The difference from the first embodiment is that, as shown in FIG. 5, the exposed area of the surface of PA66 is successively 10%, 90%, and 100% in terms of the area ratio with respect to the entire area of the sliding surface. The surface polishing amount was changed.

<Sliding test 2>
The same test as in Example 1 was performed on the plate specimens according to Examples 2 to 6 and Comparative Examples 2 to 4, and the static friction coefficient after being left for 24 hours was measured. The result is shown in FIG. FIG. 5 is a graph showing the results of the coefficient of friction of the test pieces according to Examples 2 to 6 and Comparative Examples 2 to 4.

[Result 2]
From these results, in Examples 2 to 6, the static friction coefficient after being left for 24 hours was in the range of 0.15 to 0.3. On the other hand, in the case of Comparative Example 2, the static friction coefficient after being left for 24 hours was about 0.1, and in Comparative Examples 3 and 4, the static friction coefficient after being left for 24 hours was over 0.3. .

  From this, when the exposed area of the surface of the base material of the sliding surface is less than 20% in terms of the area ratio with respect to the entire area of the sliding surface, the area where the rubber material contacts the surface of the base material Becomes too small, and the coefficient of static friction between the rubber material and the sliding surface becomes too small. Thereby, there exists a possibility that a cap may loosen in the state which obstruct | occluded the opening part.

  On the other hand, when the exposed area of the surface of the base material of the sliding surface exceeds 80% in terms of the area ratio with respect to the entire area of the sliding surface, the area where the rubber material contacts the surface of the base material is large. Thus, the static friction coefficient due to PTFE cannot be sufficiently reduced. Thereby, when opening this from the state which obstruct | occluded the opening part, it is thought that big force is needed to remove a cap.

  Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the present invention described in the claims. It can be changed.

  For example, in the present embodiment, the opening member is the opening / closing member according to the present invention, but a rubber material may be disposed on the opening end surface of the opening member and the cap may be the opening / closing member according to the present invention.

  1: opening member (opening / closing member), 10: opening portion, 11: wall portion, 12: female screw portion, 13: sliding surface, 14: base material, 15: polytetrafluoroethylene (PTFE), 20: cap, 22: Male screw part, 23: Rubber material.

Claims (1)

The rubber material has a sliding surface on which the opening slides after the rubber material slides on the sliding surface and the sliding surface is pressed against the rubber material. An opening and closing member,
The sliding surface of the opening / closing member is a surface on which polytetrafluoroethylene is formed on the surface of a base material made of a non-fluorine resin so that a part of the surface of the base material is exposed,
The surface of the base material is exposed in an area ratio of 20 to 80% with respect to the sliding surface.

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