JP2010121340A - Sealing device for door closer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing device for a door closer which seals lubricating oil by being provided to a swing operation part of a door closer and which can control the production of an unusual noise (squeak) from the swing operation part when the swing operation of the door closer is performed. <P>SOLUTION: The sealing device for the door closer is constituted by a combination of a T-ring and a plastic backup ring provided with self-lubricity in order to control the production of an unusual noise (squeak) from the swing operation part when the swing operation of the door closer is performed. It is also constituted by a combination of an O-ring and a plastic backup ring provided with self-lubricity, and is also constituted by an X-ring, an O-ring to which a coating such as isocyanate treatment has been applied, and a D-ring having a filling factor of 90 to 95%. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sealing device suitable for use in a door closer.

  The door closer is a device attached to the door that automatically closes the door opened by a person, and has a function to slow down the door so that the door does not suddenly close and pinch your hand. Have.

  Conventionally, as shown in FIG. 9, an O-ring 51 is attached to the swinging operation portion of the door closer to seal the lubricating oil. However, when the lubrication is insufficient, a noise (squeal) is generated. There is an uncomfortable feeling.

  The cause of abnormal noise (squeal) is thought to be stick-slip, but stick-slip is complicatedly related to the surface material, processing method, processing accuracy, machine body rigidity, vibration from the drive system, and lubrication. There are still many unclear points about the mechanism.

  As a result of investigating prior art at the time of filing, the following has been found, but there is no one that suppresses the generation of abnormal noise (squeal) from the swinging operation part when the door closer swings due to the seal structure. There wasn't.

JP 2006-348602 A

  The prior art described in this Patent Document 1 states that “a door closer that can control and adjust the closing speed of the door, does not close abruptly even when a hand is released from the door, and the operation sound is extremely quiet and reliable. However, the term “operation noise” here means that the operation noise generated from these air cylinders and oil cylinders when a brake device that uses air cylinders or oil cylinders is attached to the door closer. In other words, this prior art can suppress the generation of operating noise because no air cylinder or oil cylinder is used. Therefore, unlike the present invention, this technique is not intended for abnormal noise (squeaking) generated from the swinging operation part when the door closer swings.

JP 2007-091768 A

  The prior art described in Patent Document 2 states that “Because the viscosity index is high, there is no change in the door opening and closing speed throughout the season, it is excellent in wear resistance and shear stability, and the compatibility with the sealing material is good. Therefore, it can be used stably for a long period of time, does not generate abnormal noise when opening and closing the door, and is excellent in practicality such as smooth closing of the door at an appropriate speed and suitable for door closers It is an object to prevent the generation of abnormal noise by improving the hydraulic oil. Therefore, it is not a technique for a sealing device as in the present invention.

  In view of the above, the present invention is a door closer sealing device that is attached to a swing operation portion of a door closer and seals lubricating oil, and an abnormal sound (squeal) is generated from the swing operation portion during the swing operation of the door closer. It aims at providing the sealing device which can suppress generating.

  In order to achieve the above object, a sealing device according to claim 1 of the present invention is a door closer sealing device that is mounted on a swinging operation portion of a door closer and seals lubricating oil, and the swinging operation is performed when the door closer swings. In order to suppress the generation of abnormal noise (squeal) from the operation moving part, it is characterized by comprising a combination of a T-ring and a resinous backup ring having self-lubricating properties.

  According to a second aspect of the present invention, there is provided a sealing device for a door closer that is attached to a swing operation portion of a door closer and seals lubricating oil, and is different from the swing operation portion during the swing operation of the door closer. In order to suppress the generation of sound (squeal), it is a combination of an O-ring and a resinous backup ring having self-lubricating properties.

  According to a third aspect of the present invention, there is provided a seal device for a door closer which is attached to a swing operation portion of a door closer and seals lubricating oil, and is different from the swing operation portion during the swing operation of the door closer. In order to suppress the generation of sound (squeal), the X-ring is used.

  According to a fourth aspect of the present invention, there is provided a seal device for a door closer which is attached to a swing operation portion of a door closer and seals lubricating oil, and is different from the swing operation portion during the swing operation of the door closer. In order to suppress the generation of sound (squeal), it is characterized by comprising an O-ring with a coating such as isocyanate treatment.

  Furthermore, a sealing device according to a fifth aspect of the present invention is a door closer sealing device that is attached to a swing operation portion of a door closer and seals lubricating oil. The seal device operates when the door closer swings from the swing operation portion. In order to suppress the occurrence of abnormal noise (squeal), it is characterized by comprising a D-ring with a filling rate of 90 to 95%.

  Causes of abnormal noise (squeal) in the sealing device include large compression ratio, decrease in oil film thickness, occurrence of swell in the groove due to large outer diameter tension ratio, low seal rigidity, lubrication due to shaft eccentricity / tilt, etc. There may be a shortage. For this reason, in the present invention, measures are taken by changing the seal structure from the conventional O-ring alone.

  The sealing device according to claim 1 of the present invention is a combination of a T-ring and a resinous backup ring having self-lubricating properties, and according to this combined structure, the backup ring supports the T-ring which is a seal ring. In addition, non-uniform surface pressure due to undulation in the T-ring is prevented, and low friction is realized by a backup ring having self-lubricating properties. Further, since resin powder is generated by the operation, a further lubricating effect is expected. If the surface pressure of the T-ring is made uniform, low friction is realized, and further lubrication effect can be expected, the generation of the abnormal noise (squeal) can be suppressed.

  The sealing device according to claim 2 of the present invention comprises a combination of an O-ring and a resinous backup ring having self-lubricating properties, and according to this combined structure, the backup ring supports the O-ring which is a seal ring. In addition, non-uniform surface pressure due to undulations in the O-ring is prevented, and low friction is realized by the backup ring having self-lubricating properties. Further, since resin powder is generated by the operation, a further lubricating effect is expected. If the surface pressure of the O-ring is made uniform, low friction is realized, and further lubrication effect can be expected, the generation of the above abnormal noise (squeal) can be suppressed.

  The sealing device according to claim 3 of the present invention comprises an X-ring. According to this sealing structure, the X-ring includes a plurality of sealing lips, and the lubricating oil is held between the sealing lips, so that the sliding resistance is low. Reduced. If the sliding resistance is reduced, the generation of the abnormal noise (squeal) can be suppressed.

  The sealing device according to claim 4 of the present invention comprises an O-ring coated with an isocyanate treatment or the like, and according to this seal structure, sliding resistance is reduced by the coating. If the sliding resistance is reduced, the generation of the abnormal noise (squeal) can be suppressed.

  Further, the sealing device according to claim 5 of the present invention is composed of a D-ring having a filling rate of 90 to 95%. According to this sealing structure, the seal becomes difficult to move due to an increase in the filling rate. Uniformity is prevented and the rigidity of the seal is increased. If the surface pressure of the D-ring is made uniform and the seal rigidity is increased, the occurrence of the abnormal noise (squeal) can be suppressed. The filling rate of the conventional O-ring is 75 to less than 90%.

  Therefore, according to the present invention, according to each of the above-described configurations, it is possible to prevent uneven surface pressure due to waviness, reduce friction, lubricate with resin powder, reduce sliding resistance, or increase seal rigidity. It is possible to suppress the generation of abnormal noise (squeal) generated by the O-ring alone, and thus it is possible to provide a door closer with excellent silence.

  Next, embodiments of the present invention will be described with reference to the drawings.

First embodiment ...
FIG. 1 shows a cross section of a main part of a sealing device 1 according to a first embodiment of the present invention. The sealing device 1 according to this embodiment is mounted on a swing operation unit 21 in a door closer, and seals the lubricating oil G filled in the swing operation unit 21. The seal device 1 swings when the door closer swings. In order to suppress the generation of abnormal noise (squeal) from the operation moving part 21, it is configured by a combination of a T ring (seal ring) 2 and a resinous backup ring 3 having self-lubricating properties. In addition, the sealing device 1 is mounted in a mounting groove 23 provided in the inner periphery of the shaft hole of the housing 22 in the swing operation portion 21 of the door closer, and is slidably brought into close contact with the peripheral surface of the shaft 24 so that the lubricating oil G To seal.

  The T-ring 2 is formed by integrally forming a seal lip 2b radially inward at the center of the inner surface of the inner surface of the cylindrical portion 2a disposed at the groove bottom of the mounting groove 23. It is molded in a T shape. The axial length of the cylindrical portion 2 a is set to be the same as or substantially the same as the axial length of the mounting groove 23. The seal lip 2b has a sliding portion 2c formed in an arc shape in cross section at its inner diameter portion (lip end), and the sliding portion 2c is slidably in close contact with the peripheral surface of the shaft 24. As the material of the T-ring 2, oil-resistant rubber such as NBR, HNBR, ACM, FKM is suitable, but NBR is most preferable from the viewpoint of operating temperature and cost. The hardness (durometer A) is 50 to 95, preferably 50 to 80. If it is less than 50, the rigidity of the seal is insufficient and the generation of abnormal noise cannot be suppressed, and if it exceeds 95, there is a problem in assembly.

  On the other hand, the backup ring 3 is disposed on the inner diameter side of the cylindrical portion 2a of the T ring 2 and on both sides in the axial direction of the seal lip 2b. Each of the backup rings 3 is formed in a rectangular cross section and is disposed between the seal lip 2 b and the side surface of the mounting groove 23. The outer diameter dimension of the backup ring 3 is set to be the same or substantially the same as the inner diameter dimension of the cylindrical portion 2 a of the T ring 2, and the inner diameter dimension is set to be the same or substantially the same as the outer diameter dimension of the shaft 24. As a material of the backup ring 3, PTFE or the like excellent in self-lubricating property is preferable.

  In the sealing device 1 having the above-described configuration, since the sealing lip 2b of the T ring 2 that is a sealing ring is supported by the resinous backup ring 3 having self-lubricating properties from both sides in the axial direction, the T ring 2 can prevent non-uniform surface pressure due to undulations at the sliding portion 2c, and low friction can be realized by the resinous backup ring 3 having self-lubricating properties. Moreover, since the powder of the resin which is the material of the backup ring 3 is generated by the operation (sliding), a further lubricating effect can be expected. Accordingly, the surface pressure of the T-ring 2 is made uniform, low friction is realized, and a further lubrication effect is expected. Therefore, when the door closer swings, noise (squeal) is generated from the swing actuating portion 21. It can be effectively suppressed.

Second embodiment ...
In the first embodiment, the backup rings 3 arranged on both sides in the axial direction of the seal lip 2b of the T ring 2 have the same shape and the same size, but as shown in FIG. Is set larger than the outer diameter of the shaft 24 (by changing the height of the backup ring 3), the radial gap c between the backup ring 3 and the shaft 24 is set. Can be set. According to this configuration, since the lubricating oil G is easily supplied from the gap c to the sliding portion 2c of the T ring 2, further lower friction can be realized.

Third embodiment ...
FIG. 3 shows a cross section of the main part of the sealing device 1 according to the third embodiment of the present invention. The sealing device 1 according to this embodiment is mounted on a swing operation unit 21 in a door closer, and seals the lubricating oil G filled in the swing operation unit 21. The seal device 1 swings when the door closer swings. It is composed of a combination of an O-ring (seal ring) 4 and a resinous backup ring 5 having a self-lubricating property so as to suppress the generation of abnormal noise (squeal) from the operation moving part 21. In addition, the sealing device 1 is mounted in a mounting groove 23 provided in the inner periphery of the shaft hole of the housing 22 in the swing operation portion 21 of the door closer, and is slidably brought into close contact with the peripheral surface of the shaft 24 so that the lubricating oil G To seal.

  The O-ring 4 is formed into a circular cross section (including an ellipse or an ellipse), and is attached to the attachment groove 23. The O-ring 4 is in close contact with the groove bottom of the attachment groove 23 with the outer diameter portion, and the sliding portion 4a of the inner diameter portion. Is slidably in close contact with the peripheral surface of the shaft 24. As the material of the O-ring 4, oil-resistant rubber such as NBR, HNBR, ACM, FKM is suitable, but NBR is most preferable from the viewpoint of operating temperature and cost. The hardness (durometer A) is 50 to 95, preferably 50 to 80. If it is less than 50, the rigidity of the seal is insufficient and the generation of abnormal noise cannot be suppressed, and if it exceeds 95, there is a problem in assembly.

  On the other hand, the backup ring 5 is disposed on both sides of the O-ring 4 in the axial direction. The backup rings 5 are each formed in a rectangular cross section and are arranged between the O-ring 4 and the side surface of the mounting groove 23. The outer diameter of the backup ring 5 is set to be the same as or substantially the same as the inner diameter of the bottom of the mounting groove 23, and the inner diameter is set to be the same as or substantially the same as the outer diameter of the shaft 24. As a material of this backup ring 5, PTFE excellent in self-lubricating property is preferable.

  In the sealing device 1 having the above-described configuration, the O-ring 4 that is a seal ring is supported by a resinous backup ring 5 having self-lubricating properties from both sides in the axial direction. Unevenness of the surface pressure due to the undulation in the portion 4a can be prevented, and low friction can be realized by the resinous backup ring 5 having self-lubricating properties. Moreover, since the powder of the resin which is the material of the backup ring 5 is generated by the operation (sliding), a further lubricating effect can be expected. Accordingly, the surface pressure of the O-ring 4 is made uniform, low friction is realized, and a further lubrication effect is expected. Therefore, when the door closer swings, noise (squeal) is generated from the swing actuating portion 21. It can be effectively suppressed.

Fourth embodiment ...
In the third embodiment, the backup rings 5 arranged on both sides in the axial direction of the O-ring 4 have the same shape and the same size, but are arranged on the lubricating oil G side as shown in FIG. By setting the inner diameter dimension of the backup ring 5 to be larger than the outer diameter dimension of the shaft 24 (changing the height of the backup ring 5), the radial gap c is set between the backup ring 5 and the shaft 24. Can be considered. According to this configuration, the lubricating oil G is easily supplied to the sliding portion 4a of the O-ring 4 from the gap c, so that even lower friction can be realized.

Fifth Example ...
Further, as shown in FIG. 5, the backup ring 5 may be provided only on the atmosphere side (upper side in the drawing) of the O-ring 4.

Sixth Example ...
FIG. 6 shows a cross section of the main part of the sealing device 1 according to the sixth embodiment of the present invention. The sealing device 1 according to this embodiment is mounted on a swing operation unit 21 in a door closer, and seals the lubricating oil G filled in the swing operation unit 21. The seal device 1 swings when the door closer swings. The X ring 6 is configured so as to suppress the generation of abnormal noise (squeal) from the operation moving unit 21. Further, the seal device 1 is mounted in a mounting groove 23 provided in the inner periphery of the shaft hole of the housing 22 in the swing operating portion 21 of the door closer, and is slidably brought into close contact with the peripheral surface of the shaft 24 so that the lubricating oil G To seal.

  The X-ring 6 is formed in an X-shaped cross section and has two seal lips 6a on the inner and outer diameter portions thereof, and the outer ring-side seal lip 6a is in close contact with the groove bottom of the mounting groove 23 and on the inner diameter side. The seal lip 6a is in close contact with the peripheral surface of the shaft 24. As the material of the X ring 6, oil-resistant rubber such as NBR, HNBR, ACM, FKM and the like is suitable, but NBR is most preferable from the viewpoint of operating temperature and cost. The hardness (durometer A) is 50 to 95, preferably 50 to 80. If it is less than 50, the rigidity of the seal is insufficient and the generation of abnormal noise cannot be suppressed, and if it exceeds 95, there is a problem in assembly.

  In the sealing device 1 having the above-described configuration, an X-ring 6 having an X-shaped cross section is used as a sealing ring instead of a conventional O-ring alone, and the X-ring 6 includes a plurality of sealing lips 6a. It is possible to hold the lubricating oil G. Accordingly, since the sliding resistance is reduced, it is possible to effectively suppress the generation of abnormal noise (squeal) from the swing operation portion 21 during the swing operation of the door closer.

Seventh Example ...
FIG. 7 shows a cross section of the main part of the sealing device 1 according to the seventh embodiment of the present invention. The sealing device 1 according to this embodiment is mounted on a swing operation unit 21 in a door closer, and seals the lubricating oil G filled in the swing operation unit 21. The seal device 1 swings when the door closer swings. The O-ring 7 is provided with a coating 8 made of an isocyanate treatment so as to suppress the generation of abnormal noise (squeal) from the operation moving portion 21. In addition, the sealing device 1 is mounted in a mounting groove 23 provided in the inner periphery of the shaft hole of the housing 22 in the swing operation portion 21 of the door closer, and is slidably brought into close contact with the peripheral surface of the shaft 24 so that the lubricating oil G To seal.

  The O-ring 7 to which the coating 8 made of isocyanate treatment is applied is formed into a circular cross section (including an ellipse or an ellipse), mounted in the mounting groove 23, and its outer diameter portion closely contacts the groove bottom of the mounting groove 23. In addition, the inner diameter portion is in close contact with the peripheral surface of the shaft 24. As the material of the O-ring 7, oil-resistant rubber such as NBR, HNBR, ACM, FKM is suitable, but NBR is most preferable from the viewpoint of operating temperature and cost. The hardness (durometer A) is 50 to 95, preferably 50 to 80. If it is less than 50, the rigidity of the seal is insufficient and the generation of abnormal noise cannot be suppressed, and if it exceeds 95, there is a problem in assembly.

  In the sealing device 1 configured as described above, an O-ring 7 provided with a coating 8 made of isocyanate treatment is used as a seal ring instead of a conventional O-ring alone, and the coating 8 made of isocyanate treatment reduces sliding resistance. It is something that can be done. Accordingly, since the sliding resistance is reduced, it is possible to effectively suppress the generation of abnormal noise (squeal) from the swing operation portion 21 during the swing operation of the door closer.

Eighth Example ...
FIG. 8 shows a cross section of the main part of the sealing device 1 according to the eighth embodiment of the present invention. The sealing device 1 according to this embodiment is mounted on a swing operation unit 21 in a door closer, and seals the lubricating oil G filled in the swing operation unit 21. The seal device 1 swings when the door closer swings. In order to suppress the generation of abnormal noise (squeal) from the operation moving unit 21, the D-ring 9 has a filling rate of 90 to 95%. Since the filling rate in the case of the conventional O-ring simple substance is less than 75 to 90%, the filling rate is set larger than the conventional one. In addition, the sealing device 1 is mounted in a mounting groove 23 provided in the inner periphery of the shaft hole of the housing 22 in the swing operation portion 21 of the door closer, and is slidably brought into close contact with the peripheral surface of the shaft 24 so that the lubricating oil G To seal.

  The D ring 9 is formed in a D-shaped cross section, and has a sliding portion 9a formed in an arc shape in the inner diameter portion thereof. The sliding portion 9a is slidably in close contact with the peripheral surface of the shaft 24. is doing. As a material for the D ring 9, oil-resistant rubber such as NBR, HNBR, ACM, FKM is suitable, but NBR is most preferable from the viewpoint of operating temperature and cost. The hardness (durometer A) is 50 to 95, preferably 50 to 80. If it is less than 50, the rigidity of the seal is insufficient and the generation of abnormal noise cannot be suppressed, and if it exceeds 95, there is a problem in assembly.

  In the sealing device 1 having the above configuration, since the D-ring 9 having a filling rate of 90 to 95% is used as the seal ring instead of the conventional O-ring alone, the seal becomes difficult to move due to an increase in the filling rate. Nonuniform surface pressure can be prevented, and the rigidity of the seal can be increased. Accordingly, since the surface pressure is made uniform and the rigidity of the seal is increased, it is possible to effectively suppress the generation of abnormal noise (squeal) from the swing operation portion 21 during the swing operation of the door closer.

  In the above description, the sealing device according to each embodiment is mounted in the mounting groove 23 provided in the inner periphery of the shaft hole of the housing 22, and slidably comes into close contact with the peripheral surface of the shaft 24 so that the lubricating oil G is supplied. However, the lubricating oil G may be sealed by being attached to a mounting groove provided on the peripheral surface of the shaft 24 and in close contact with the inner peripheral surface of the shaft hole of the housing 22.

Sectional drawing of the principal part of the sealing device for door closers which concerns on 1st Example of this invention. Sectional drawing of the principal part of the sealing device for door closers which concerns on 2nd Example of this invention. Sectional drawing of the principal part of the sealing device for door closers which concerns on 3rd Example of this invention. Sectional drawing of the principal part of the seal apparatus for door closers which concerns on 4th Example of this invention. Sectional drawing of the principal part of the sealing device for door closers which concerns on 5th Example of this invention. Sectional drawing of the principal part of the sealing device for door closers which concerns on 6th Example of this invention. Sectional drawing of the principal part of the sealing device for door closers which concerns on 7th Example of this invention. Sectional drawing of the principal part of the sealing device for door closers which concerns on 8th Example of this invention. Sectional drawing of the principal part of the sealing device for door closers according to the conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sealing device 2 T ring 2a Cylindrical part 2b, 6a Seal lip 2c, 4a, 9a Sliding part 3, 5 Backup ring 4, 7 O ring 6 X ring 8 Coating 9 D ring 21 Swing action part 22 Housing 23 Installation Groove 24 shaft

Claims (5)

A door closer sealing device that is attached to a swing operation portion of a door closer and seals lubricating oil,
A seal device for a door closer comprising a combination of a T-ring and a resinous backup ring having self-lubricating properties in order to suppress the generation of abnormal noise from the swing operating portion during the swing operation of the door closer. . A door closer sealing device that is attached to a swing operation portion of a door closer and seals lubricating oil,
A door closer sealing device comprising a combination of an O-ring and a resinous backup ring having a self-lubricating property so as to suppress the generation of abnormal noise from the swing operating portion during the swing operation of the door closer. . A door closer sealing device that is attached to a swing operation portion of a door closer and seals lubricating oil,
A door closer sealing device comprising an X ring in order to suppress the generation of abnormal noise from the swing operating portion during the swing operation of the door closer. A door closer sealing device that is attached to a swing operation portion of a door closer and seals lubricating oil,
A seal device for a door closer, comprising an O-ring coated with an isocyanate treatment or the like so as to suppress abnormal noise from the swing operating portion during the swing operation of the door closer. A door closer sealing device that is attached to a swing operation portion of a door closer and seals lubricating oil,
A door closer sealing device comprising a D-ring with a filling rate of 90 to 95% in order to suppress the generation of abnormal noise from the swing operating portion during the swing operation of the door closer.

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