WO2016121739A1 - 摺動部品 - Google Patents
摺動部品 Download PDFInfo
- Publication number
- WO2016121739A1 WO2016121739A1 PCT/JP2016/052139 JP2016052139W WO2016121739A1 WO 2016121739 A1 WO2016121739 A1 WO 2016121739A1 JP 2016052139 W JP2016052139 W JP 2016052139W WO 2016121739 A1 WO2016121739 A1 WO 2016121739A1
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- WO
- WIPO (PCT)
- Prior art keywords
- negative pressure
- sliding
- sliding surface
- groove
- pressure generating
- Prior art date
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Classifications
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- 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
- F16J15/164—Sealings between relatively-moving surfaces the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/12—Shaft sealings using sealing-rings
- F04D29/126—Shaft sealings using sealing-rings especially adapted for liquid pumps
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- 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
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3404—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal
- F16J15/3408—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal at least one ring having an uneven slipping surface
- F16J15/3412—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal at least one ring having an uneven slipping surface with cavities
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- 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
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3404—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal
- F16J15/3408—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal at least one ring having an uneven slipping surface
- F16J15/3424—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal at least one ring having an uneven slipping surface with microcavities
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- 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
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3496—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member use of special materials
Definitions
- the present invention relates to a sliding part suitable for a sliding part, for example, a mechanical seal, a bearing, and the like.
- the present invention relates to a sliding component such as a seal ring or a bearing that requires a fluid to be interposed in the sliding surface to reduce friction and prevent fluid from leaking from the sliding surface.
- a mechanical seal which is an example of a sliding component
- its performance is evaluated by a leakage amount, a wear amount, and a torque.
- the performance is improved by optimizing the sliding material and sliding surface roughness of the mechanical seal, and low leakage, long life, and low torque are realized.
- further improvement in the performance of mechanical seals is required, and technical development that exceeds the framework of conventional techniques is required.
- an additive of LLC which is a kind of antifreeze, such as silicate and phosphate (hereinafter referred to as “sediment”). It has been confirmed that the “causing substance” is concentrated on the sliding surface, deposits are generated, and the function of the mechanical seal may be deteriorated. The generation of this deposit is considered to be a phenomenon that also occurs in mechanical seals of equipment that handles chemicals and oil.
- a negative pressure may be generated in the sliding surface due to its characteristics. It has been confirmed in experiments that the deposit-causing substance is excessively deposited and generated by evaporating the sealing fluid, the deposit is generated at an accelerated rate, and the function of the mechanical seal may be deteriorated. Further, the concentrated / evaporated fluid leaking out of the sliding surface may be pulled back by the negative pressure, and may be accumulated on the sliding surface.
- a groove is provided, and this buffer groove becomes a buffer (buffer) for the high-pressure fluid of the low-pressure fluid that enters the sliding surface from the low-pressure fluid side, delaying the time until the sliding surface is filled with low-pressure fluid (for example, air),
- low-pressure fluid for example, air
- an object of the present invention is to provide a sliding component that prevents the deposits from adhering to the land portion and improves the sealing function of the sliding surface.
- the present invention focuses on the antifouling property and low adhesion property of the anti-adhesion material, and coats the surface of the negative pressure generating mechanism where deposits are likely to precipitate and generate with a film of the anti-adhesion material.
- the deposit is prevented from being deposited on the surface of the negative pressure generating mechanism, the deposit is prevented from adhering to the sliding surface, and the sealing function of the sliding surface is improved.
- the films of the anti-adhesion material the diamond-like carbon film in particular has excellent characteristics such as high hardness, high wear resistance, low friction coefficient, high chemical stability, and high seizure resistance.
- the anti-adhesion material is a material having antifouling properties and low adhesion to the substances causing deposits, such as diamond-like carbon (DLC), diamond, and fluororesin (PTFE). , Fluorine, titanium nitride (TiN), and silicon resin.
- a sliding component of the present invention includes, firstly, an annular fixed-side sealing ring fixed to a fixed side, and an annular rotating-side sealing ring that rotates together with a rotating shaft, Sliding to seal high-pressure fluid existing on one side in the radial direction of the sliding surface sliding relative to each other by rotating each sliding surface facing the stationary sealing ring and the rotating sealing ring facing each other.
- a negative pressure generating mechanism that generates a negative pressure by relative rotation sliding between the fixed-side seal ring and the rotary-side seal ring is provided on the sliding surface of either the fixed-side seal ring or the rotary-side seal ring.
- At least the surface of the negative pressure generating mechanism is covered with a film of anti-adhesion material. According to this feature, even if the deposit-causing substances are deposited by the negative pressure of the negative pressure generating mechanism, the anti-fouling property and low adhesion property of the film of the anti-adhesive material can prevent the negative pressure generating mechanism. Deposits can be prevented from accumulating on the surface, and as a result, deposits can be prevented from adhering to the land as well, so that a sliding component with an improved sealing function of the sliding surface can be provided.
- the sliding component of the present invention is secondly characterized in that, in the first feature, the negative pressure generating mechanism is composed of dimples formed on the sliding surface. According to this feature, it is possible to prevent deposits from being deposited on the surface of the dimple, which is a negative pressure generating mechanism. A sliding part with improved functions can be provided.
- the sliding component of the present invention is characterized in that, in the first feature, the negative pressure generating mechanism is formed on the sliding surface, and the fluid entering the sliding surface is discharged to the high pressure fluid side. It is characterized by comprising a groove. According to this feature, it is possible to prevent deposits from being deposited on the surface of the low pressure fluid side end portion of the pumping groove, which is a negative pressure generating mechanism, and to prevent the deposits from adhering to the land portion as well. As a result, it is possible to provide a sliding component with an improved sealing surface sealing function.
- the sliding component according to the first feature wherein the negative pressure generating mechanism is provided on the low pressure side of the sliding surface and communicates with the high pressure fluid side and the low pressure fluid.
- a negative pressure generating groove separated from the side by a land portion is provided.
- the sliding component of the present invention is characterized in that the negative pressure generating mechanism is composed of a reverse Rayleigh step mechanism.
- the negative pressure generating mechanism is composed of a reverse Rayleigh step mechanism.
- a reverse Rayleigh step mechanism suitable as a negative pressure generating mechanism that can be formed on the sliding surface of the sliding component is provided, and precipitates are formed on the surface of the reverse Rayleigh step mechanism that is the negative pressure generating mechanism. Accumulation can be prevented, and as a result, adhesion of deposits is prevented even in the land portion, and as a result, a sliding component having an improved sealing function on the sliding surface can be provided.
- the sliding component is characterized in that, in the fourth feature, the negative pressure generating mechanism is composed of a reverse spiral groove.
- the negative pressure generating mechanism is composed of a reverse spiral groove.
- the present invention has the following excellent effects. (1) Since at least the surface of the negative pressure generation mechanism is coated with a film of an anti-adhesion material, even if deposit-causing substances are precipitated by the negative pressure of the negative pressure generation mechanism, The antifouling property and low adhesion of the conductive material film can prevent deposits from accumulating on the surface of the negative pressure generation mechanism, and in turn prevent the deposits from adhering to the land. As a result, it is possible to provide a sliding component with an improved sealing surface sealing function.
- Deposits can be prevented from accumulating on the surface of the dimple, which is a negative pressure generating mechanism, and as a result, deposits are prevented from adhering to the land as well, thereby improving the sliding surface sealing function.
- a sliding part can be provided.
- Deposits can be prevented from accumulating on the surface of the pumping groove, which is a negative pressure generating mechanism, and as a result, the deposits are prevented from adhering to the land as well.
- An improved sliding component can be provided.
- FIG. 1 shows a sliding surface of a sliding component according to Embodiment 1 of the present invention. It is a figure which shows the condition of the sliding surface in which the negative pressure generation groove
- FIG. 4 is a diagram showing the state of a sliding surface provided with a negative pressure generating groove when a sealing test is performed using a sliding component coated with a diamond-like carbon film on a sealed fluid containing a deposit-causing substance. is there.
- FIG. It is a figure explaining the reverse Rayleigh step which comprises the negative pressure generation mechanism which concerns on Example 1.
- FIG. It is a figure which shows the reverse spiral groove which comprises the negative pressure generation mechanism which concerns on Example 2 of this invention. It is a figure which shows the dimple which comprises the negative pressure generation mechanism which concerns on Example 3 of this invention. It is a figure which shows the pumping groove which comprises the negative pressure generation mechanism which concerns on Example 4 of this invention.
- Example 1 of this invention With reference to FIG. 1 thru
- a mechanical seal which is an example of a sliding part will be described as an example.
- the outer peripheral side of the sliding part which comprises a mechanical seal is demonstrated as a high pressure fluid side (sealed fluid side) and an inner peripheral side is a low pressure fluid side (atmosphere side), this invention is not limited to this The present invention can also be applied to the case where the high-pressure fluid side and the low-pressure fluid side are reversed.
- FIG. 1 is a longitudinal sectional view showing an example of a mechanical seal, which is an inside type that seals a sealed fluid on a high-pressure fluid side that is about to leak from the outer periphery of the sliding surface toward the inner peripheral direction.
- a mechanical seal which is an inside type that seals a sealed fluid on a high-pressure fluid side that is about to leak from the outer periphery of the sliding surface toward the inner peripheral direction.
- annular ring which is one sliding component provided on the rotary shaft 1 side for driving a pump impeller (not shown) on the high pressure fluid side via a sleeve 2 so as to be rotatable integrally with the rotary shaft 1.
- a ring-shaped stationary side sealing ring 5 which is the other sliding part provided in the pump housing 4 in a non-rotating state and capable of moving in the axial direction.
- the coiled wave spring 6 and the bellows 7 that urge the ring 5 in the axial direction are closely slid on the sliding surfaces S that are mirror-finished by lapping or the like. That is, this mechanical seal prevents the sealed fluid from flowing out from the outer periphery of the rotating shaft 1 to the atmosphere side on the sliding surfaces S of the rotating side sealing ring 3 and the stationary side sealing ring 5. .
- FIG. 2 shows a sliding surface of the sliding component according to the first embodiment of the present invention.
- a negative pressure generating mechanism is provided on the sliding surface of the stationary seal ring 5 in FIG. Will be explained. The same applies to the case where a negative pressure generating mechanism is provided on the sliding surface of the rotation-side seal ring 3.
- the outer peripheral side of the sliding surface S of the stationary seal ring 5 is the high-pressure fluid side
- the inner peripheral side is the low-pressure fluid side, for example, the atmosphere side
- the counterpart sliding surface rotates counterclockwise.
- the sliding surface of the stationary seal ring 5 communicates with the high-pressure fluid side and is connected to the low-pressure fluid side by a smooth portion R of the sliding surface S (in the present invention, sometimes referred to as a “land portion”).
- the isolated fluid circulation grooves 10 are provided in four circumferential directions in the circumferential direction.
- the fluid circulation groove 10 includes an inlet portion 10a that enters from the high-pressure fluid side, an outlet portion 10b that exits to the high-pressure fluid side, and a communication portion 10c that communicates the inlet portion 10a and the outlet portion 10b in the circumferential direction. Is isolated by a land portion R.
- the fluid circulation groove 10 plays a role of positively introducing and discharging the sealed fluid from the high-pressure fluid side to the sliding surface in order to prevent the fluid containing corrosion products and the like from being concentrated on the sliding surface.
- the inlet portion 10a and the outlet portion 10b are formed so that the fluid to be sealed is taken into the sliding surface in accordance with the rotation direction of the mating sliding surface and is easily discharged, while reducing leakage. Therefore, it is isolated from the low-pressure fluid side by the land portion R.
- the inlet portion 10a and the outlet portion 10b are linearly formed from the center of the sliding surface in the radial direction.
- the present invention is not limited to this, and the inlet portion 10a and the outlet portion 10b
- the inclination may be further increased and may be a curved line (such as an arc) instead of a straight line.
- the width and depth of the fluid circulation groove 10 are set to optimum values according to the pressure and type (viscosity) of the sealed fluid.
- the sliding surface provided with the fluid circulation groove 10 is provided with a positive pressure generation mechanism 11 including a positive pressure generation groove 11a shallower than the fluid circulation groove 10 in a portion surrounded by the fluid circulation groove 10 and the high-pressure fluid side. Yes.
- the positive pressure generating mechanism 11 increases the fluid film between the sliding surfaces by generating a positive pressure (dynamic pressure), thereby improving the lubrication performance.
- the positive pressure generating groove 11a communicates with the inlet portion of the fluid circulation groove 10, and is separated from the outlet portion 10b and the high pressure fluid side by the land portion R.
- the positive pressure generation mechanism 11 includes a Rayleigh step mechanism including a positive pressure generation groove 11a and a Rayleigh step 11b communicating with the inlet 10a of the fluid circulation groove 10, but is not limited thereto.
- it may be constituted by a femto groove with a dam. In short, any mechanism that generates positive pressure may be used.
- the sliding surface of the stationary seal ring 5 is further outside the portion surrounded by the fluid circulation groove 10 and the high-pressure fluid side, that is, between the adjacent fluid circulation grooves 10 and 10.
- a reverse Rayleigh step mechanism 12 that constitutes a negative pressure generating mechanism is provided on the low pressure side in the radial direction of the sliding surface.
- the reverse Rayleigh step mechanism 12 includes a groove 12a and a reverse Rayleigh step 12b constituting a negative pressure generating groove shallower than the fluid circulation groove 10, and the groove 12a is separated from the low-pressure fluid side by a land portion R and downstream.
- the upstream reverse Rayleigh step 12 b communicates with the inlet portion 10 a of the fluid circulation groove 10 and is isolated from the upstream fluid circulation groove 10 by the land portion R.
- the reverse Rayleigh step mechanism 12 constituting the negative pressure generating mechanism takes into the groove 12a the sealed fluid that is about to leak from the high pressure fluid side to the low pressure fluid side due to the generation of the negative pressure, and the fluid circulation groove 10 To prevent the leakage between the adjacent fluid circulation grooves 10 and 10 where the Rayleigh step mechanism 12 is not provided.
- the sealing property of the entire sliding surface is improved.
- the reverse Rayleigh step mechanism 12 will be described in detail later. Further, an optimal number can be appropriately selected as the equal number of the fluid circulation groove 10, the Rayleigh step mechanism 11, and the reverse Rayleigh step mechanism 12, and the ratio of the lengths of the Rayleigh step mechanism 11 and the reverse Rayleigh step mechanism 12.
- the depth and width of the fluid circulation groove 10, the positive pressure generating groove 11a of the positive pressure generating mechanism 11, and the groove 12a of the reverse Rayleigh step mechanism 12 are the diameter of the sliding component, the sliding surface width and the relative moving speed, and the sealing. In addition, it is of a nature appropriately determined according to the lubrication conditions and the like. As an example, when the diameter of the sliding component is about 20 mm and the sliding surface width is about 2 mm, the width of the positive pressure generating groove 11 and the groove 12a is 0.4 to 0.6 mm, and the depth is several hundred nanometers to The width of the inner peripheral seal surface 16 is 0.2 to 0.4 mm. The width of the fluid circulation groove 10 is sufficient to circulate a high-pressure fluid, and the depth is several tens ⁇ m to several hundreds ⁇ m.
- the surface of the groove 12a is covered with a diamond-like carbon film (also referred to as “DLC film”) 15.
- DLC film diamond-like carbon film
- the diamond-like carbon film 15 is formed by a CVD method (chemical vapor deposition method), a PVD method (physical vapor deposition method), a sputtering method, an ion plating method, or the like.
- the DLC material is amorphous, and the bonding form between carbons consists of both a diamond structure (SP3 bond) and a graphite bond (SP2 bond).
- SP3 bond a diamond structure
- SP2 bond graphite bond
- aC amorphous carbon
- aC amorphous carbon
- aC hydrogen amorphous carbon
- MeC partially including metal elements such as titanium (Ti) and molybdenum (Mo).
- Etc. can be used.
- the thickness of the diamond-like carbon film 15 is not particularly limited. For example, when the thickness is set to about 0.5 ⁇ m, the depth of the groove 12a is several ⁇ m, which affects the negative pressure generation of the reverse Rayleigh step mechanism 12. There is no effect.
- the formed diamond-like carbon film does not have crystal grain boundaries because of its amorphous structure, and therefore has a very smooth surface compared to a hard thin film having a polycrystalline structure.
- the diamond-like carbon film has excellent properties such as high hardness, high wear resistance, low friction coefficient, high chemical stability, and high seizure resistance.
- the diamond-like carbon film is particularly preferable. Focusing on the antifouling properties and low adhesion properties of diamond, a diamond-like carbon film is coated on the surface of the negative pressure generation mechanism where deposits are likely to be deposited and generated, and the deposits adhere to the surface of the negative pressure generation mechanism -Prevents accumulation, prevents adhesion of deposits on the sliding surface, and improves the sealing function of the sliding surface.
- FIG. 3 shows a reverse Rayleigh step when a sealed test is performed using a sliding component in which a groove 12a of the reverse Rayleigh step mechanism 12 is not coated with the diamond-like carbon film 15 on a sealed fluid containing a deposit generation cause substance. It is a figure which shows the condition of the sliding surface in which the mechanism 12 was provided. At the end of the sealing test, water was allowed to flow on the sliding surface provided with the negative pressure generating groove and photographed in a state where the air was blown, and deposits were observed on the groove 12a and the land. The height of the deposition was about 5 ⁇ m.
- FIG. 4 shows a reverse Rayleigh when a sealed test is performed using a sliding component in which a groove 12a of the reverse Rayleigh step mechanism 12 is coated with a diamond-like carbon film 15 on a sealed fluid containing a deposit generation cause substance. It is a figure which shows the condition of the sliding surface in which the step mechanism 12 was provided. At the end of the sealing test, water was poured onto the sliding surface provided with the reverse Rayleigh step mechanism 12 and then taken with a photograph in an air blown state. Deposits were deposited on the groove 12a and the land R. There wasn't.
- the reverse Rayleigh step mechanism 12 will be described with reference to FIG. 5A, it is assumed that the rotation-side sealing ring 3 rotates in the clockwise direction and the opposite fixed-side sealing ring 5 rotates in the counterclockwise direction, as indicated by arrows.
- a reverse Rayleigh step 12b (spreading step) is formed on the sliding surface S of the fixed-side seal ring 5 so as to be perpendicular to the relative movement direction and facing the downstream side, and a groove portion is formed on the downstream side of the reverse Rayleigh step 12b. 12a is formed.
- the sliding surface of the opposite rotation side sealing ring 3 is flat.
- FIG. 5 (b) shows the reverse Rayleigh step 12b of FIG. 5 (a) modified to a linear inclined surface 12b-1
- FIG. 5 (c) is the reverse of FIG. 5 (a).
- the Rayleigh step 12b is changed to a curved inclined surface 12b-2.
- a negative pressure substantially the same as that in FIG. 5A is generated.
- the mechanism shown in FIGS. 5B and 5C is called a reverse deformation Rayleigh step mechanism and is included in the reverse Rayleigh step.
- the sliding component includes the annular fixed-side seal ring 5 that is fixed to the fixed side, and the annular rotary-side seal ring 3 that rotates together with the rotary shaft 1. Sliding to seal the high-pressure fluid existing on one side in the radial direction of the sliding surfaces that slide relative to each other by rotating each sliding surface facing the fixed seal ring 5 and the rotating seal ring 3 relative to each other.
- a negative pressure that generates a negative pressure on the sliding surface of either the fixed-side seal ring 5 or the rotary-side seal ring 3 due to relative rotational sliding between the fixed-side seal ring 5 and the rotary-side seal ring 3.
- a reverse Rayleigh step mechanism 12 that is a generating mechanism is provided.
- the reverse Rayleigh step mechanism 12 is provided on the low pressure side of the sliding surface, communicates with the high pressure fluid side, and is separated from the low pressure fluid side by the land portion R.
- Groove 12a which is a negative pressure generating groove Since the surface of the reverse Rayleigh step mechanism 12 is covered with the diamond-like carbon film 15, even if deposit-causing substances are deposited by the negative pressure of the reverse Rayleigh step mechanism 12, the antifouling property of the diamond-like carbon film 15 is maintained. Therefore, it is possible to prevent the deposit from depositing on the surface of the groove 12a due to the property and the low adhesion, and as a result, the adhesion of the deposit is also prevented in the land portion R.
- a sliding component with an improved sealing function can be provided.
- Example 2 of this invention With reference to FIG. 6, the sliding component which concerns on Example 2 of this invention is demonstrated.
- the same reference numerals as those in the first embodiment denote the same members as those in the first embodiment, and duplicate descriptions are omitted.
- the reverse spiral groove 20 which is a negative pressure generating mechanism is isolated by the land portion R without directly communicating with the low pressure fluid side.
- the reverse spiral groove 20 is provided over the entire sliding surface of the stationary seal ring 5. Further, the high pressure side end 20 a of the reverse spiral groove 20 communicates with the pressure release groove 21, and a part of the pressure release groove 21 is connected to the high pressure fluid side via the radial groove 22.
- the reverse spiral groove 20 sucks the fluid leaking from the high-pressure fluid by generating a negative pressure by the relative rotational movement with the mating sliding surface, and moves to the high-pressure fluid side through the pressure release groove connected to the high-pressure fluid side. Push back. Then, cavitation occurs in the reverse spiral groove 20, precipitates are generated in the reverse spiral groove 20, and the deposits adhere to and accumulate on the reverse spiral groove 20 and the land portion R, which becomes a factor of reducing the sealing performance. ing.
- the reverse spiral groove 20 is covered with the diamond-like carbon film 15 similar to that in the first embodiment. Since the surface of the reverse spiral groove 20 which is a negative pressure generating mechanism is covered with the diamond-like carbon film 15, even when deposit-causing substances are deposited by the negative pressure of the reverse spiral groove 20, the diamond-like carbon film 15 Due to the antifouling property and low adhesion property, the deposit is prevented from depositing on the surface of the reverse spiral groove 20 and adhering to the land portion R, and a sliding part with improved sliding surface sealing function is provided. Can provide.
- Example 2 of this invention With reference to FIG. 7, the sliding component which concerns on Example 2 of this invention is demonstrated.
- the same reference numerals as those in the first embodiment denote the same members as those in the first embodiment, and duplicate descriptions are omitted.
- a plurality of quadrilateral dimples 25 are provided in the circumferential direction on the sliding surface S between the fixed-side seals 5.
- the dimples 25 are not in communication with the high pressure fluid side and the low pressure fluid side, and the dimples 25 are provided independently of each other.
- the number, area, and depth of the dimples 25 are set to optimum values depending on conditions such as the diameter and surface width of the stationary ring 5 and the differential pressure between the high-pressure fluid side and the low-pressure fluid side.
- the shallow dimples are preferable in terms of fluid lubrication and liquid film formation.
- the rotation-side seal ring 3 rotates counterclockwise with respect to the fixed-side seal ring 5, but when the dimple 25 is formed on the sliding surface S of the fixed ring 5.
- a narrowing gap (step) 25a exists on the downstream side of the dimple 25, and an expanding gap (step) 25b exists on the upstream side.
- the fluid interposed between the sliding surfaces of the stationary seal ring 5 and the rotary seal ring 3 tends to follow the moving direction of the rotary seal ring 3 due to its viscosity.
- a positive pressure is generated by the presence of 25a, and a dynamic pressure (negative pressure) as shown by a broken line is generated by the presence of the expansion gap (step) 25b.
- a positive pressure is generated on the downstream side in the dimple 25 and a negative pressure is generated on the upstream side. Then, cavitation occurs in the negative pressure generation region on the upstream side, precipitates are generated in the negative pressure generation region, and the deposits adhere and accumulate in the negative pressure generation region and the land portion R, thereby improving the sealing performance. It is a factor to decrease.
- the dimple 25 is covered with the diamond-like carbon film 15 similar to that in the first embodiment. Since the surface of the dimple 25 that generates a positive pressure and a negative pressure is covered with the diamond-like carbon film 15, a deposit-causing substance is deposited in the dimple 25 due to the negative pressure near the expansion gap (step) 25 b. However, the antifouling property and low adhesion of the diamond-like carbon film 15 can prevent deposits from accumulating on the surface of the dimple 25 and adhering to the land portion R, and has a sliding surface sealing function. It is possible to provide a sliding component with improved performance.
- the diamond-like carbon film 15 may be covered not only on the entire surface of the dimple 25 but only on the negative pressure generation region on the upstream side.
- Example 2 of this invention With reference to FIG. 8, the sliding component which concerns on Example 2 of this invention is demonstrated.
- the same reference numerals as those in the first embodiment denote the same members as those in the first embodiment, and duplicate descriptions are omitted.
- the sliding surface S of the fixed-side sealing ring 5 is provided with a spiral groove 30 having an angle for discharging the fluid to the high-pressure fluid side by relative sliding with the counterpart sliding surface.
- the fluid is pushed back to the high pressure fluid side by the viscous pump effect of 30 to prevent leakage.
- Vapor cavitation may occur in the portion of the low-pressure fluid side end of the spiral groove 30 (upstream portion of the fluid flow accompanying relative movement with the mating sliding surface, the inner peripheral side in FIG. 8),
- a silicate-based coolant is used as the fluid to be sealed, precipitates are generated at the low-pressure fluid side end portion 31 of the spiral groove 30 where steam cavitation occurs, and adhere to and accumulate on the land portion R. This is a factor that reduces the sealing performance.
- the spiral groove 30 is coated with the same diamond-like carbon film 15 as in the first embodiment. Since the surface of the spiral groove 30 is covered with the diamond-like carbon film 15, the diamond-like carbon film is formed even when a deposit-causing substance is deposited in the spiral groove 30 due to the negative pressure near the low-pressure fluid side end 31. 15 has an antifouling property and low adhesion, so that deposits can be prevented from adhering and accumulating on the surface of the spiral groove 30 and the land portion R, and the sliding function improves the sealing function of the sliding surface. Can provide parts.
- the diamond-like carbon film 15 may be covered not only on the entire surface of the spiral groove 30 but only on the upstream negative pressure generating region.
- the reverse Rayleigh step mechanism 12 the reverse spiral groove 20, the dimple 25, and the spiral groove 30 have been described as the negative pressure generation mechanism.
- the undulation also includes a negative pressure generating portion.
- the surface of the negative pressure generating portion of the negative pressure generating mechanism provided on the sliding surface of either the fixed side sealing ring or the rotating side sealing ring is coated with the diamond-like carbon film 15.
- the entire sliding surface may be covered.
- the deposit may adhere to and accumulate on the land portion R as well as the surface of the negative pressure generating portion of the negative pressure generating mechanism.
- the sliding surface may be covered.
- the film of the anti-adhesion material coated on the surface of the negative pressure generating mechanism is a diamond-like carbon film, but is not limited thereto, and is not limited thereto. Any film may be used as long as it is formed of any one of resin (PTFE), fluorine, titanium nitride (TiN), and silicon resin.
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これに対応すべく、本出願人は、メカニカルシール等の摺動部品において、トルク低減と漏れ量低減の二律背反を両立させるため、摺動面に、例えば、レイリーステップ、逆レイリーステップ、逆スパイラルグルーブ、U字あるいはナノレベルの凹凸等の表面テクスチャを用いたメカニカルシールが本出願人らによって開発されている(例えば、特許文献1、2及び3参照。)。
また、同様に、流体を高圧流体側へ排出する流体排出手段を備えた摺動部品において、流体排出手段よりも低圧側の摺動面には低圧流体の高圧流体側への進入を緩和する緩衝溝を設け、この緩衝溝が低圧流体側から摺動面に進入する低圧流体の高圧流体に対する緩衝(バッファー)となり、摺動面が低圧流体(例えば空気)で満たされるまでの時間を遅延させ、高圧流体の脱水縮合反応を抑制するようにした発明も特許出願している(特許文献5参照。)。
本発明は、耐凝着性材料の持つ防汚性及び低凝着性の特性に着目し、堆積物が析出・生成されやすい負圧発生機構の表面に耐凝着性材料の膜を被覆し、負圧発生機構の表面において堆積物が堆積されるのを防止し、摺動面における堆積物の付着を防止し、摺動面のシール機能を向上させるようにしたものである。耐凝着性材料の膜のうち、特に、ダイヤモンドライクカーボン膜は、高硬度、高耐摩耗性、低摩擦係数、高化学安定性及び高耐焼き付き性などの優れた特性を有する。
なお、本発明において、耐凝着性材料とは、堆積物発生原因物質に対して防汚性及び低凝着性を有する材料であり、ダイヤモンドライクカーボン(DLC)、ダイヤモンド、フッ素樹脂(PTFE)、フッ素、窒化チタン(TiN)、及び、シリコン樹脂のいずれかの材料を意味する。
上記目的を達成するため本発明の摺動部品は、第1に、固定側に固定される円環状の固定側密封環と、回転軸とともに回転する円環状の回転側密封環とを備え、前記固定側密封環及び前記回転側密封環の対向する各摺動面を相対回転させることにより、当該相対回転摺動する前記摺動面の径方向の一方側に存在する高圧流体を密封する摺動部品において、
前記固定側密封環または前記回転側密封環のいずれか一方の摺動面には、前記固定側密封環と前記回転側密封環との相対回転摺動により負圧を発生する負圧発生機構が設けられ、
少なくとも前記負圧発生機構の表面は耐凝着性材料の膜により被覆されていることを特徴としている。
この特徴によれば、負圧発生機構の負圧により堆積物発生原因物質が析出される場合でも、耐凝着性材料の膜の持つ防汚性及び低凝着性により、負圧発生機構の表面に析出物が堆積するのを防止することができ、ひいては、ランド部においても堆積物の付着が防止される結果、摺動面のシール機能を向上させた摺動部品を提供するができる。
この特徴によれば、負圧発生機構であるディンプルの表面に析出物が堆積するのを防止することができ、ひいては、ランド部においても堆積物の付着が防止される結果、摺動面のシール機能を向上させた摺動部品を提供するができる。
この特徴によれば、負圧発生機構であるポンピング溝の低圧流体側端部の表面に析出物が堆積するのを防止することができ、ひいては、ランド部においても堆積物の付着が防止される結果、摺動面のシール機能を向上させた摺動部品を提供するができる。
この特徴によれば、高圧流体側から低圧流体側への流体の漏洩を効果的に防止できるようにしたものにおいて、負圧発生機構である負圧発生溝の表面に析出物が堆積するのを防止することができ、ひいては、ランド部においても堆積物の付着が防止される結果、摺動面のシール機能を向上させた摺動部品を提供するができる。
この特徴によれば、摺動部品の摺動面に形成可能な負圧発生機構として好適な逆レイリーステップ機構を備えたもにおいて、負圧発生機構である逆レイリーステップ機構の表面に析出物が堆積するのを防止することができ、ひいては、ランド部においても堆積物の付着が防止される結果、摺動面のシール機能を向上させた摺動部品を提供するができる。
この特徴によれば、摺動部品の摺動面に形成可能な負圧発生機構として好適な逆スパイラルグルーブを備えたものにおいて、負圧発生機構である逆スパイラルグルーブの表面に析出物が堆積するのを防止することができ、ひいては、ランド部においても堆積物の付着が防止される結果、摺動面のシール機能を向上させた摺動部品を提供するができる。
(1)少なくとも前記負圧発生機構の表面は耐凝着性材料の膜により被覆されていることにより、負圧発生機構の負圧により堆積物発生原因物質が析出される場合でも、耐凝着性材料の膜の持つ防汚性及び低凝着性により、負圧発生機構の表面に析出物が堆積するのを防止することができ、ひいては、ランド部においても堆積物の付着が防止される結果、摺動面のシール機能を向上させた摺動部品を提供するができる。
(3)負圧発生機構であるポンピング溝の表面に析出物が堆積するのを防止することができ、ひいては、ランド部においても堆積物の付着が防止される結果、摺動面のシール機能を向上させた摺動部品を提供するができる。
(6)摺動部品の摺動面に形成可能な負圧発生機構として好適な逆スパイラルグルーブを備えたものにおいて、負圧発生機構である逆スパイラルグルーブの表面に析出物が堆積するのを防止することができ、ひいては、ランド部においても堆積物の付着が防止される結果、摺動面のシール機能を向上させた摺動部品を提供するができる。
なお、本実施例においては、摺動部品の一例であるメカニカルシールを例にして説明する。また、メカニカルシールを構成する摺動部品の外周側を高圧流体側(被密封流体側)、内周側を低圧流体側(大気側)として説明するが、本発明はこれに限定されることなく、高圧流体側と低圧流体側とが逆の場合も適用可能である。
なお、回転側密封環3の摺動面に負圧発生機構が設けられる場合も同様である。
流体循環溝10は、高圧流体側から入る入口部10a、高圧流体側に抜ける出口部10b、及び、入口部10a及び出口部10bとを周方向に連通する連通部10cから構成され、低圧流体側とはランド部Rにより隔離されている。流体循環溝10は、摺動面において腐食生成物などを含む流体が濃縮されることを防止するため、積極的に高圧流体側から被密封流体を摺動面上に導入し排出するという役割を担うものであり、相手摺動面の回転方向に合わせて摺動面上に被密封流体を取り入れ、かつ、排出しやすいように入口部10a及び出口部10bが形成される一方、漏れを低減するため、低圧流体側とはランド部Rにより隔離されている。本例では、入口部10a及び出口部10bは摺動面の中心から放射方向に向けた直線状に形成されているが、特にこれに限定されるものではなく、入口部10a及び出口部10bの傾きをさらに大きくしてもよく、また、直線状ではなく曲線状(円弧状など)にしてもよい。また、流体循環溝10の幅及び深さは、被密封流体の圧力、種類(粘性)などに応じて最適なものに設定される。
正圧発生溝11aは流体循環溝10の入口部に連通し、出口部10b及び高圧流体側とはランド部Rにより隔離されている。
本例では、正圧発生機構11は、流体循環溝10の入口部10aに連通する正圧発生溝11a及びレイリーステップ11bを備えたレイリーステップ機構から構成されるが、これに限定されることなく、例えば、ダム付きフェムト溝で構成してもよく、要は、正圧を発生する機構であればよい。
なお、逆レイリーステップ機構12については、後記において詳細に説明する。
また、流体循環溝10、レイリーステップ機構11及び逆レイリーステップ機構12の等配数やレイリーステップ機構11と逆レイリーステップ機構12の長さの比は、適宜最適なものを選定できる。
一例として示すと、摺動部品の径が約20mm、摺動面幅が約2mmの場合、正圧発生溝11及びグルーブ12aの幅は0.4~0.6mm、深さは数百ナノ~1μmであり、内周側のシール面16の幅は0.2~0.4mmである。また、流体循環溝10の幅は高圧の流体を循環させるために十分の幅であり、深さは数十μm~数百μmである。
このため、本実施例においては、グルーブ12aの表面にダイヤモンドライクカーボン膜(「DLC膜」ともいう。)15が被覆されている。
DLC材料は、非晶質のものであって、炭素同士の結合形態がダイヤモンド構造(SP3結合)とグラファイト結合(SP2結合)の両方から成る。例えば、炭素元素だけから成るa-C(アモルファスカーボン)、水素を含有するa-C:H(水素アモルファスカーボン)、及びチタン(Ti)やモリブデン(Mo)等の金属元素を一部に含むMeCなどを用いることができる。
ダイヤモンドライクカーボン膜15の厚さは、特に限定されないが、例えば、0.5μm程度に設定した場合、グルーブ12aの深さが数μmであるから、逆レイリーステップ機構12の負圧発生に影響を及ぼすことはない。
ダイヤモンドライクカーボン膜は、高硬度、高耐摩耗性、低摩擦係数、高化学安定性及び高耐焼き付き性などの優れた特性を有するものであり、本実施例においては、特に、ダイヤモンドライクカーボン膜の持つ防汚性及び低凝着性の特性に着目し、堆積物が析出・生成されやすい負圧発生機構の表面にダイヤモンドライクカーボン膜を被覆し、負圧発生機構の表面において析出物が付着・堆積されるのを防止し、摺動面における堆積物の付着を防止し、摺動面のシール機能を向上させるようにしたものである。
密封試験の最後に、負圧発生溝が設けられた摺動面に水を流水後、エアブローした状態において写真で撮影したもので、グルーブ12a及びランド部に析出物の堆積が認められた。堆積の高さは約5μmであった。
密封試験の最後に、逆レイリーステップ機構12が設けられた摺動面に水を流水後、エアブローした状態において写真で撮影したもので、グルーブ12a及びランド部Rには析出物の堆積は認められなかった。
図5(a)において、矢印で示すように、回転側密封環3は時計方向に、相対する固定側密封環5は反時計方向に相対回転するものとする。固定側密封環5の摺動面Sには、相対的移動方向と垂直かつ下流側に面して逆レイリーステップ12b(広がり段差)が形成され、該逆レイリーステップ12bの下流側にはグルーブ部12aが形成されている。相対する回転側密封環3の摺動面は平坦である。
回転側密封環3及び固定側密封環5が矢印で示す方向に相対移動すると、両密封環3及び5の摺動面S間に介在する流体が、その粘性によって、密封環3または5の移動方向に追随移動しようとするため、その際、逆レイリーステップ12bの存在によって破線で示すような動圧(負圧)を発生する。
なお、図6において、実施例1の符号と同じ符号は実施例1と同じ部材を示しており、重複する説明は省略する。
負圧発生機構である逆スパイラルグルーブ20の表面はダイヤモンドライクカーボン膜15により被覆されているため、逆スパイラルグルーブ20の負圧により堆積物発生原因物質が析出される場合でも、ダイヤモンドライクカーボン膜15の持つ防汚性及び低凝着性により、析出物が逆スパイラルグルーブ20の表面に堆積し、ランド部Rに付着することが防止され、摺動面のシール機能を向上させた摺動部品を提供するができる。
なお、図7において、実施例1の符号と同じ符号は実施例1と同じ部材を示しており、重複する説明は省略する。
正圧及び負圧を発生するディンプル25の表面はダイヤモンドライクカーボン膜15により被覆されているため、拡がり隙間(段差)25b付近の負圧によりディンプル25内に堆積物発生原因物質が析出される場合でも、ダイヤモンドライクカーボン膜15の持つ防汚性及び低凝着性により、析出物がディンプル25の表面に堆積し、ランド部Rに付着するのを防止することができ、摺動面のシール機能を向上させた摺動部品を提供するができる。
なお、ダイヤモンドライクカーボン膜15は、ディンプル25の全面ではなく、上流側の負圧発生領域にのみ被覆されてもよい。
なお、図8において、実施例1の符号と同じ符号は実施例1と同じ部材を示しており、重複する説明は省略する。
スパイラル溝30の低圧流体側端部(相手摺動面との相対運動に伴う流体流れの上流側部分。図8においては内周側)31の部分に蒸気性のキャビテーションが発生することがあり、被密封流体として、シリケート系のクーラントを使用した場合などにおいて、蒸気性キャビテーションの発生するスパイラル溝30の低圧流体側端部31の部分に析出物が発生し、ランド部Rに付着・堆積し、密封性を低下させる要因となっている。
スパイラル溝30の表面はダイヤモンドライクカーボン膜15により被覆されているため、低圧流体側端部31付近の負圧によりスパイラル溝30内に堆積物発生原因物質が析出される場合でも、ダイヤモンドライクカーボン膜15の持つ防汚性及び低凝着性により、析出物がスパイラル溝30の表面及びランド部Rに付着・堆積するのを防止することができ、摺動面のシール機能を向上させた摺動部品を提供するができる。
なお、ダイヤモンドライクカーボン膜15は、スパイラル溝30の全面ではなく、上流側の負圧発生領域にのみ被覆されてもよい。
また、長時間の使用において、析出物が負圧発生機構の負圧発生部の表面のみならず、ランド部Rに付着・堆積する場合があるため、例えば、負圧発生部の設けられない相手摺動面に被覆してもよい。
2 スリーブ
3 回転側密封環
4 ハウジング
5 固定側密封環
6 コイルドウェーブスプリング
7 ベローズ
10 流体循環溝
10a 入口部
10b 出口部
10c 連通部
11 正圧発生機構
11a 正圧発生溝
11b レイリーステップ
12 逆レイリーステップ機構
12a グルーブ
12b 逆レイリーステップ
15 ダイヤモンドライクカーボン膜
20 逆スパイラルグルーブ
20a 高圧側端部
21 圧力開放溝
22 半径方向溝
25 ディンプル
25a 狭まり隙間(段差)
25b 拡がり隙間(段差)
30 スパイラル溝
31 低圧流体側端部
S 摺動面
R ランド部
Claims (6)
- 固定側に固定される円環状の固定側密封環と、回転軸とともに回転する円環状の回転側密封環とを備え、前記固定側密封環及び前記回転側密封環の対向する各摺動面を相対回転させることにより、当該相対回転摺動する前記摺動面の径方向の一方側に存在する高圧流体を密封する摺動部品において、
前記固定側密封環または前記回転側密封環のいずれか一方の摺動面には、前記固定側密封環と前記回転側密封環との相対回転摺動により負圧を発生する負圧発生機構が設けられ、
少なくとも前記負圧発生機構の表面は耐凝着性材料の膜により被覆されていることを特徴とする摺動部品。 - 前記負圧発生機構が前記摺動面に形成されたディンプルから構成されることを特徴とする請求項1に記載の摺動部品。
- 前記負圧発生機構が前記摺動面に形成され、前記摺動面に浸入する流体を高圧流体側に排出するポンピング溝から構成されることを特徴とする請求項1に記載の摺動部品。
- 前記負圧発生機構は、前記摺動面の低圧側に位置して設けられ、高圧流体側と連通するとともに低圧流体側とはランド部により隔離された負圧発生溝を備えることを特徴とする請求項1記載の摺動部品。
- 前記負圧発生機構が逆レイリーステップ機構から構成されることを特徴とする請求項4に記載の摺動部品。
- 前記負圧発生機構が逆スパイラルグルーブから構成されることを特徴とする請求項4に記載の摺動部品。
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WO2018070265A1 (ja) * | 2016-10-14 | 2018-04-19 | イーグル工業株式会社 | 摺動部品 |
JPWO2017061406A1 (ja) * | 2015-10-05 | 2018-07-26 | イーグル工業株式会社 | 摺動部品 |
JP2018138796A (ja) * | 2017-02-24 | 2018-09-06 | 株式会社クボタ | メカニカルシール |
JP2019015401A (ja) * | 2017-07-04 | 2019-01-31 | イーグル工業株式会社 | メカニカルシール |
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JPWO2019049847A1 (ja) * | 2017-09-05 | 2020-10-15 | イーグル工業株式会社 | 摺動部品 |
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WO2015031474A1 (en) * | 2013-08-27 | 2015-03-05 | Eaton Corporation | Seal ring composite for improved hydrodynamic seal performance |
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JP7305289B2 (ja) | 2018-08-24 | 2023-07-10 | イーグル工業株式会社 | 摺動部材 |
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WO2020162351A1 (ja) * | 2019-02-04 | 2020-08-13 | イーグル工業株式会社 | 摺動部品 |
CN113490796A (zh) | 2019-02-14 | 2021-10-08 | 伊格尔工业股份有限公司 | 滑动部件 |
JP7374573B2 (ja) | 2019-02-21 | 2023-11-07 | イーグル工業株式会社 | 摺動部品 |
JP7404352B2 (ja) * | 2019-04-11 | 2023-12-25 | イーグル工業株式会社 | 摺動部品 |
EP4345343A3 (en) * | 2019-07-26 | 2024-06-19 | Eagle Industry Co., Ltd. | Sliding component |
DE102020003268A1 (de) * | 2020-05-29 | 2021-12-02 | KSB SE & Co. KGaA | Kreiselpumpe mit einer Gleitringdichtungsanordnung |
KR20230150356A (ko) * | 2021-03-12 | 2023-10-30 | 이구루코교 가부시기가이샤 | 슬라이딩 부품 |
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US10487944B2 (en) | 2015-01-31 | 2019-11-26 | Eagle Industry Co., Ltd. | Slide component |
JPWO2017061406A1 (ja) * | 2015-10-05 | 2018-07-26 | イーグル工業株式会社 | 摺動部品 |
US11009130B2 (en) | 2016-10-14 | 2021-05-18 | Eagle Industry Co., Ltd. | Sliding component |
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JPWO2018070265A1 (ja) * | 2016-10-14 | 2019-08-08 | イーグル工業株式会社 | 摺動部品 |
EP3527859A4 (en) * | 2016-10-14 | 2020-06-10 | Eagle Industry Co., Ltd. | SLIDING COMPONENT |
WO2018070265A1 (ja) * | 2016-10-14 | 2018-04-19 | イーグル工業株式会社 | 摺動部品 |
CN109906330B (zh) * | 2016-10-14 | 2021-12-14 | 伊格尔工业股份有限公司 | 滑动部件 |
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JP7154692B2 (ja) | 2017-07-04 | 2022-10-18 | イーグル工業株式会社 | メカニカルシール |
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JP7242533B2 (ja) | 2017-09-05 | 2023-03-20 | イーグル工業株式会社 | 摺動部品 |
Also Published As
Publication number | Publication date |
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EP3252354A1 (en) | 2017-12-06 |
JP6640121B2 (ja) | 2020-02-05 |
JPWO2016121739A1 (ja) | 2017-11-09 |
AU2016213259A1 (en) | 2017-07-27 |
EP3252354A4 (en) | 2018-10-17 |
US20180010690A1 (en) | 2018-01-11 |
CN107208804A (zh) | 2017-09-26 |
US10487944B2 (en) | 2019-11-26 |
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