WO2018147815A1 - Teflon coated oil seal ring for hydraulic rod seals - Google Patents
Teflon coated oil seal ring for hydraulic rod seals Download PDFInfo
- Publication number
- WO2018147815A1 WO2018147815A1 PCT/TH2017/000034 TH2017000034W WO2018147815A1 WO 2018147815 A1 WO2018147815 A1 WO 2018147815A1 TH 2017000034 W TH2017000034 W TH 2017000034W WO 2018147815 A1 WO2018147815 A1 WO 2018147815A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ring
- teflon
- rod seals
- rod
- oil seal
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3268—Mounting of sealing rings
- F16J15/3272—Mounting of sealing rings the rings having a break or opening, e.g. to enable mounting on a shaft otherwise than from a shaft end
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3232—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips
- F16J15/3236—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip having two or more lips with at least one lip for each surface, e.g. U-cup packings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
Definitions
- the existing oil seal ring for hydraulic rod seals are made from 2 main types of material which are: Polyurethane (PU) and rubber.
- the polyurethane seal ring (PU) is outstanding in its ecumenical strength. It can efficiently withstand oil pressure, and excellent resistance to abrasion which make polyurethane suitable for moving part work. However, polyurethane seal ring has its weakness in compression set which directly affects life expectancy of the seal ring.
- the rubber seal ring is great for its elasticity which is resulted in great compression set. It is suitable for low pressure and less moving part work. However it is limited by its mechanical strength that is significantly lower than the polyurethane seal ring.
- the outer seal rod is made from Polyurethane (PU). While, the inner O-ring is made from rubber.
- the result of the integration of multi-layer technology is the seal ring with high performance in abrasion resistance from Polyurethane (PU) and low compression set from rubber.
- the life expectancy of oil seal ring for hydraulic rod seals is 3-6 months depending on working conditions.
- the material improvement must seek for a low friction material which is lower than friction of Polyurethane (PU), but still maintain its strength not less than Polyurethane (PU). Additionally, such material must have heat resistance greater than Polyurethane and rubber.
- PU Polyurethane
- PU Polyurethane
- PU Polyurethane
- heat resistance greater than Polyurethane and rubber.
- Polytetrafluoroethylene or TEFLON in multi-layer coating with rubber for lowering friction is an effective choice.
- the low friction coefficient of Polytetrafluoroethylene or TEFLON leads to enhancement in abrasion resistance, lowered heat generated from abrasion and extended service life of seal ring for hydraulic rod seals for more than 20%. The details will be described in the topic of the total invention disclosure.
- TEFLON coated oil seal ring for hydraulic rod seals consists of the following components:
- Rod seals which is made from Polyurethane (PU) in circle shape acting as joint structure between cylinder and O-RING.
- One part of the rod seals is attached to the cylinder structure and the other part is attached to circle shaped O-RING.
- the centre of the rod seals and O-RING is for moving hydraulic cylinder rod.
- the O-RING will contact with the inner surface of the hydraulic cylinder rod in order to prevent oil leakage inside the hydraulic cylinder resulting in relatively high pressure endurance and thus greater efficiency of machine function.
- Rod seals and O-RING are held together with the lock or any holding method, and is attached tightly by adhesive in order to increase the holding strength which is permanently held - unable to separate.
- This manufacturing process solves the problem for inexperienced user in changing oil seal ring for hydraulic cylinder during maintenance which may mistakenly separate rod seals and O-RFNG apart.
- the lock or any holding method between rod seals and O-RING and adhesive can prevent the tearing apart problem (delamination).
- the friction between O-RING and hydraulic cylinder rod is decreased by coating O-RING with TEFLON or providing at least 1 layer of TEFLON attached to the O-RING surface by adhesive and heat compression - one of each or multiple in combination - especially at the contact position of hydraulic cylinder rod in order to decrease friction.
- the manufacturing procedure is as described as follows:
- the adhesive is composed of Ethyl Alcohol, Methanol, Carbon Black, Methyl Isobutyl Ketone in the following proportion:
- the surface modification of TEFLON is conducted by dipping the TEFLON plate in surface modifying chemicals with the composition as shown below for 15 minutes. Then rinse out the TEFLON by Acetone and distilled water sequentially.
- composition of the surface modifying chemicals is the composition of the surface modifying chemicals:
- the purpose of this invention is to invent the TEFLON coated oil seal ring for rod seals with low friction between O-RING which its surface is in contact with the hydraulic cylinder.
- the O-RING is manufactured by coating TEFLON or is provided at least 1 layer of TEFLON attached to the O-RING surface by adhesive and heat compression - one of each or multiple in combination - especially at the contact position of hydraulic cylinder rod in order to decrease friction and reduce the heat generation during the machine functioning. This will result in energy saving and prolong the O-RING life expectancy more than 20%.
- Figure 1 show the composition of TEFLON coated oil seal ring for rod seals as follows:
- Rod seals (1) which is made from Polyurethane (PU) in circle shape acting as joint structure between cylinder (2) and O-RING (3).
- One part of the rod seals (1) is attached to the cylinder (2) structure and another part of rod seals (1) is attached to circle shaped O-RING (3), and the centre of the rod seals (1) and O-RING (3) is for moving hydraulic cylinder rod (4).
- the O-RING (3) will contact with the inner surface of the hydraulic cylinder rod (4) in order to prevent oil leakage inside the hydraulic cylinder (2), and to maintain required pressure level resulting in more efficiency of machine function.
- Rod seals (1) and O-RING (3) are held together with the lock or any holding method (no illustration) and is attached tightly by adhesive to increase the holding strength which is permanently held - unable to separate- to solve problem for inexperienced user in changing the O-RING (3) which may mistakenly separate rod seals (1) and O-RING (3) apart.
- the lock or any holding method between rod seals (1) and O-RING (3) and adhesive can prevent the tearing problem.
- Step by step preparation procedure of the invention is shown as follows:
- composition of adhesive is as follows:
- the surface modification of TEFLON (5) is performed by dipping TEFLON (5) plate in TEFLON (5) surface modifying chemicals for 15 minutes. Thereafter, rinse out the TEFLON (5) by Acetone and distilled water in sequence.
- composition of the surface modifying chemicals is as follows:
- Figure 1 show the composition of TEFLON coated oil seal ring for rod seals in this invention.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Material Composition (AREA)
- Sealing Devices (AREA)
Abstract
TEFLON coated oil seal ring for hydraulic rod seals consists of rod seals (1) which is made from Polyurethane (PU) and O-RING (3) which is made from rubber attached to the rod seals (1). The O-RING (3) being in contact with the hydraulic cylinder (4) owns its special characteristics which is coated by TEFLON (5) or 1ayered with at least l layer of TEFLON (5) attached to the O-RING (3) surface by adhesive or heat compression – one of each or multiple in combination – especially at the contact position of hydraulic cylinder rod (4) in order to decrease friction, to reduce the heat generation during the machine functioning, to save the energy and to increase the O-RING (3) life expectancy.
Description
TEFLON COATED OIL SEAL RING FOR HYDRAULIC ROD SEALS
Branch of Science Associated with the Invention
Related engineering technology of Teflon coated oil seal ring for hydraulic rod seals.
Background of related art or science
The existing oil seal ring for hydraulic rod seals are made from 2 main types of material which are: Polyurethane (PU) and rubber.
The polyurethane seal ring (PU) is outstanding in its ecumenical strength. It can efficiently withstand oil pressure, and excellent resistance to abrasion which make polyurethane suitable for moving part work. However, polyurethane seal ring has its weakness in compression set which directly affects life expectancy of the seal ring.
The rubber seal ring is great for its elasticity which is resulted in great compression set. It is suitable for low pressure and less moving part work. However it is limited by its mechanical strength that is significantly lower than the polyurethane seal ring.
Nowadays there is integrated technology of multi-layer for increasing seal ring efficiency by combining both of materials. As mentioned above, the outer seal rod is made from Polyurethane (PU). While, the inner O-ring is made from rubber. The result of the integration of multi-layer technology is the seal ring with high performance in abrasion resistance from Polyurethane (PU) and low compression set from rubber. The life expectancy of oil seal ring for hydraulic rod seals is 3-6 months depending on working conditions.
The quality improvement of the seal ring, nowadays, is in the following fashion: (i) increase abrasion resistance or (ii) lower compression set or (iii) increase heat resistance. These improvements are often obstructed by material native properties that means the improvement result is not worth the investment.
In practice, the damage causes of oil seal ring after functioning as hydraulic rod seals can be categorized as follows:
- wear from the abrasion
- permanent deformation from high oil pressure
- material degradation from high working temperature.
As a consequence, the material improvement must seek for a low friction material which is lower than friction of Polyurethane (PU), but still maintain its strength not less than Polyurethane (PU). Additionally, such material must have heat resistance greater than Polyurethane and rubber. The aforementioned properties can be found in Polytetrafluoroethylene or usually known as TEFLON.
Therefore the use of Polytetrafluoroethylene or TEFLON in multi-layer coating with rubber for lowering friction is an effective choice. The low friction coefficient of Polytetrafluoroethylene or TEFLON leads to enhancement in abrasion resistance, lowered heat generated from abrasion and extended service life of seal ring for hydraulic rod seals for more than 20%. The details will be described in the topic of the total invention disclosure.
Invention Characteristics and Objectives
TEFLON coated oil seal ring for hydraulic rod seals consists of the following components:
Rod seals which is made from Polyurethane (PU) in circle shape acting as joint structure between cylinder and O-RING. One part of the rod seals is attached to the cylinder structure and the other part is attached to circle shaped O-RING. The centre of the rod seals and O-RING is for moving hydraulic cylinder rod. The O-RING will contact with the inner surface of the hydraulic cylinder rod in order to prevent oil leakage inside the hydraulic cylinder resulting in relatively high pressure endurance and thus greater efficiency of machine function.
Therefore, during machine functioning, the moving hydraulic cylinder rod will move inside the cylinder and contact with O-RING all the times causing wear and thus service life of O-RING.
Rod seals and O-RING are held together with the lock or any holding method, and is attached tightly by adhesive in order to increase the holding strength which is permanently
held - unable to separate. This manufacturing process solves the problem for inexperienced user in changing oil seal ring for hydraulic cylinder during maintenance which may mistakenly separate rod seals and O-RFNG apart. Thus the lock or any holding method between rod seals and O-RING and adhesive can prevent the tearing apart problem (delamination).
For the invention details, the friction between O-RING and hydraulic cylinder rod is decreased by coating O-RING with TEFLON or providing at least 1 layer of TEFLON attached to the O-RING surface by adhesive and heat compression - one of each or multiple in combination - especially at the contact position of hydraulic cylinder rod in order to decrease friction. By this method, heat generation during machine functioning and save the energy saving in conjunction with increased life expectancy more than 20% of O-RING are resulted.
The manufacturing procedure is as described as follows:
- Prepare the TEFLON plate with the area larger than the contact surface of the O- RING, and proceed the circle shaped cutting as same size as the O-RING.
- Adhere the TEFLON plate to the O-RING surface with adhesive, and leave the adhesive dry. Alternatively, adhere by heat compression — one of each or multiple in combination— in order to hold TEFLON with O-RING.
The adhesive is composed of Ethyl Alcohol, Methanol, Carbon Black, Methyl Isobutyl Ketone in the following proportion:
- Ethyl Alcohol: 50-70% by weight
- Methanol: 1 -10% by weight
- Carbon Black: 1 -10% by weight
- Methyl Isobutyl Ketone: 1-10% by weight
Because of the TEFLON inertness, it cannot be attached directly to the rubber surface, and the modification of TEFLON and O-RING is needed by the following steps:
1. The surface modification of TEFLON is conducted by dipping the TEFLON plate in surface modifying chemicals with the composition as shown below for 15 minutes. Then rinse out the TEFLON by Acetone and distilled water sequentially.
The composition of the surface modifying chemicals:
- Tetrahydrofuran: 85.5% by weight - Naphthalene: 12.3% by weight
- Sodium: 2.2 % by weight
- Methyl Isobutyl Ketone: 1-10 % by weight
2. After surface modification specified in 1 and 2, apply the adhesive on TEFLON surface to be bonded to O-RING and then attach TEFLON to O-RING. Leave the adhesive to dry naturally or under heated compression dry or combine with heat compression- one of each or both in combination— in order to tightly hold TEFLON ad O-RING together.
The purpose of this invention is to invent the TEFLON coated oil seal ring for rod seals with low friction between O-RING which its surface is in contact with the hydraulic cylinder. The O-RING is manufactured by coating TEFLON or is provided at least 1 layer of TEFLON attached to the O-RING surface by adhesive and heat compression - one of each or multiple in combination - especially at the contact position of hydraulic cylinder rod in order to decrease friction and reduce the heat generation during the machine functioning. This will result in energy saving and prolong the O-RING life expectancy more than 20%.
Full Disclosure of the Invention
Figure 1 show the composition of TEFLON coated oil seal ring for rod seals as follows:
Rod seals (1) which is made from Polyurethane (PU) in circle shape acting as joint structure between cylinder (2) and O-RING (3). One part of the rod seals (1) is attached to the cylinder (2) structure and another part of rod seals (1) is attached to circle shaped O-RING (3), and the centre of the rod seals (1) and O-RING (3) is for moving hydraulic cylinder rod
(4). The O-RING (3) will contact with the inner surface of the hydraulic cylinder rod (4) in order to prevent oil leakage inside the hydraulic cylinder (2), and to maintain required pressure level resulting in more efficiency of machine function.
Therefore, during the machine functioning, the moving hydraulic cylinder rod (4) will move inside the cylinder (2) and contact with O-RING (3) all the times leading to O-RING
(3) wear and its life time shortening.
Rod seals (1) and O-RING (3) are held together with the lock or any holding method (no illustration) and is attached tightly by adhesive to increase the holding strength which is permanently held - unable to separate- to solve problem for inexperienced user in changing the O-RING (3) which may mistakenly separate rod seals (1) and O-RING (3) apart. Thus the lock or any holding method between rod seals (1) and O-RING (3) and adhesive can prevent the tearing problem.
For the invention details, the friction between O-RING (3) and hydraulic cylinder rod
(4) is decreased by coated O-RING (3) with TEFLON (5) or by providing at least 1 layer of TEFLON (5) attached to the O-RING (3) surface with adhesive and heat compression - one of each or multiple in combination - especially at the contact position of hydraulic cylinder rod (4) in order to decrease friction, to reduce the heat generation during the machine functioning, to save the energy and to increase the O-RING (3) life expectancy more than 20%. Step by step preparation procedure of the invention is shown as follows:
- Prepare the TEFLON (5) plate with its area larger than the contact surface of the O- RING (3), and proceed the circle shaped cutting with similar dimension to the O-RING (3).
- Adhere the TEFLON (5) plate to the O-RING (3) surface with adhesive, and then leave the adhesive to dry naturally or with the aids of hot compression— one of each or multiple in combination— in order to hold TEFLON (5) with O-RING (3).
The composition of adhesive is as follows:
- Ethyl Alcohol: 50-70% by weight
- Methanol: 1-10% by weight
- Carbon Black: 1 -10% by weight
- Methyl Isobutyl Ketone: 1 -10% by weight
Because of the TEFLON (5) inertness, it cannot be attached directly to the rubber and therefore the surface modification of the TEFLON (5) and O-RING (3) is needed with the following steps:
The surface modification of TEFLON (5) is performed by dipping TEFLON (5) plate in TEFLON (5) surface modifying chemicals for 15 minutes. Thereafter, rinse out the TEFLON (5) by Acetone and distilled water in sequence.
The composition of the surface modifying chemicals is as follows:
- Tetrahydrofuran: 85.5% by weight - Naphthalene: 12.3% by weight
- Sodium: 2.2 % by weight
- Methyl Isobutyl Ketone: 1-10% by weight
After surface modification of O-RING (3) and TEFLON (5), apply the adhesive on TEFLON (5) surface to be attached to O-RING (3) and then attach TEFLON (5) to O-RING (3), and leave the adhesive to dry naturally or with aids of heat compression— one of each or both in combination— in order to tightly hold TEFLON (5) ad O-RING (3) together.
Brief Description of Drawing
Figure 1 show the composition of TEFLON coated oil seal ring for rod seals in this invention.
Best Invention Method
As mentioned in the total disclosure of the invention
Claims
1. TEFLON coated oil seal ring for rod seals possesses characteristics as follows:
Rod seals (1) which is made from Polyurethane (PU) in circle shape acting as joint structure between cylinder (2) and O-RING (3). One part of the rod seals (1) is attached to the cylinder (2) structure and the other part of rod seals (1) is attached to circle shaped O-RING (3).
Circle shaped O-RING (3) is rubber attached to rod seals. The centre of the rod seals (1 ) and O-RING (3) is for moving hydraulic cylinder rod (4). The O-RING (3) will contact with the inner surface of the hydraulic cylinder rod (4) in order to prevent oil leakage inside the hydraulic cylinder (2) and to maintain required pressure level resulting in more efficiency of the machine function.
The special characteristics
O-RING (3) is coated with TEFLON (5) or layered with at least 1 layer of TEFLON (5) attached to the O-RING (3) surface by adhesive and heat compression - one of each or multiple in combination - especially at the contact position of hydraulic cylinder rod (4) in order to decrease friction, to reduce the heat generation during the machine functioning, to save the energy and to increase the O-RING (3) life expectancy.
2. TEFLON coated oil seal O-RING for rod seals pad in accordance with claims 1 is such that rod seals (1) and O-RING (3) are held together with the lock or any holding method, and is attached tightly by adhesive to increase the holding strength which is permanently held.
3. TEFLON coated oil seal O-RING for rod seals in accordance with claims 1 is such that O-RING (3) is coated with TEFLON (5) as follows:
A. Prepare the TEFLON (5) surface modification with its area larger than the contact surface of the O-RING (3), and proceed the circle shaped cutting with similar dimension to the O-RING (3).
B. Adhere the TEFLON (5) plate to the O-RING (3) surface by applying
adhesive on required surface and leave the adhesive to dry or adhere by heat compression— one of each or multiple in combination— in order to hold TEFLON (5) with O-RING (3).
4. TEFLON coated oil seal ring for rod seals in accordance with claims 1 is such that the adhesive is composed of the following ingredients: Ethyl Alcohol, Methanol, Carbon Black, Methyl Isobutyl Ketone.
5. TEFLON coated oil seal ring for rod seals in accordance with claims 4 is such that the adhesive composition is as follows:
- Ethyl Alcohol: 50-70% by weight
- Methanol: 1-10% by weight
- Carbon Black: 1-10% by weight
- Methyl Isobutyl Ketone: 1-10% by weight
6. TEFLON coated oil seal ring for rod seals in accordance with claims 1 is such that O-RING (3) and TEFLON (5) have to process through the surface modification before they are held together with the following steps:
A Proceed the chemical surface modification on the surface of TEFLON (5) by dipping TEFLON (5) in Tetrahydrofiiran, Naphthalene and Sodium solution for 15 minutes, and rinse out with Acetone and distilled water sequentially.
7. TEFLON coated oil seal ring for rod seals in accordance with claims 6 is such that the composition of surface modifying solution is as follows:
- Tetrahydrofiiran: 85.5% by weight
- Naphthalene: 12.3% by weight
- Sodium: 2.2 by weight
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TH1701000701 | 2017-02-09 | ||
| TH1701000701 | 2017-02-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2018147815A1 true WO2018147815A1 (en) | 2018-08-16 |
Family
ID=63106986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/TH2017/000034 WO2018147815A1 (en) | 2017-02-09 | 2017-04-24 | Teflon coated oil seal ring for hydraulic rod seals |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2018147815A1 (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0629412A2 (en) * | 1993-06-03 | 1994-12-21 | Sun Medical Technology Research Corporation | Auxiliary artificial heart embedded in a ventricle of a heart |
| GB2340899A (en) * | 1998-08-06 | 2000-03-01 | Fluorocarbon Company Limited | Protection of a lip seal |
| CN101021271A (en) * | 2007-03-15 | 2007-08-22 | 重庆恒驰科技信息咨询有限公司 | Axle sealing oil-seal and seal lip material thereof |
| CN202301957U (en) * | 2011-10-26 | 2012-07-04 | 太仓市明宇密封件有限公司 | Combined sealing ring for MBD shaft |
| JP2013104504A (en) * | 2011-11-15 | 2013-05-30 | Olympus Corp | Joint structure of pipe and joining object member |
| CN205423824U (en) * | 2015-12-08 | 2016-08-03 | 锐欣国际有限公司 | Oil blanket improvement structure |
-
2017
- 2017-04-24 WO PCT/TH2017/000034 patent/WO2018147815A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0629412A2 (en) * | 1993-06-03 | 1994-12-21 | Sun Medical Technology Research Corporation | Auxiliary artificial heart embedded in a ventricle of a heart |
| GB2340899A (en) * | 1998-08-06 | 2000-03-01 | Fluorocarbon Company Limited | Protection of a lip seal |
| CN101021271A (en) * | 2007-03-15 | 2007-08-22 | 重庆恒驰科技信息咨询有限公司 | Axle sealing oil-seal and seal lip material thereof |
| CN202301957U (en) * | 2011-10-26 | 2012-07-04 | 太仓市明宇密封件有限公司 | Combined sealing ring for MBD shaft |
| JP2013104504A (en) * | 2011-11-15 | 2013-05-30 | Olympus Corp | Joint structure of pipe and joining object member |
| CN205423824U (en) * | 2015-12-08 | 2016-08-03 | 锐欣国际有限公司 | Oil blanket improvement structure |
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