CN115298472A - Lubricant sealing device, lubricant, and additive - Google Patents
Lubricant sealing device, lubricant, and additive Download PDFInfo
- Publication number
- CN115298472A CN115298472A CN202180020295.7A CN202180020295A CN115298472A CN 115298472 A CN115298472 A CN 115298472A CN 202180020295 A CN202180020295 A CN 202180020295A CN 115298472 A CN115298472 A CN 115298472A
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- lubricant
- responsive substance
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- substance
- gear
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M177/00—Special methods of preparation of lubricating compositions; Chemical modification by after-treatment of components or of the whole of a lubricating composition, not covered by other classes
-
- 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
- F16N—LUBRICATING
- F16N29/00—Special means in lubricating arrangements or systems providing for the indication or detection of undesired conditions; Use of devices responsive to conditions in lubricating arrangements or systems
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/20—Colour, e.g. dyes
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/66—Hydrolytic stability
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2040/00—Specified use or application for which the lubricating composition is intended
- C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
-
- 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
- F16N—LUBRICATING
- F16N2200/00—Condition of lubricant
- F16N2200/08—Acidity, pH-value
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Lubricants (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The invention provides a lubricant sealing device capable of monitoring pH variation of lubricant during operation of the lubricant sealing device. Also disclosed are a lubricant and an additive which enable the rapid determination of the pH fluctuation of the lubricant. In order to solve the above problems, a lubricant enclosing device in which a pH responsive substance whose molecular structure changes according to the pH of a lubricant is disposed at a portion that comes into contact with the enclosed lubricant, a lubricant containing the pH responsive substance, and an additive added to the lubricant are provided. According to the present invention, by disposing the pH responsive substance in contact with the lubricant, it is possible to monitor pH variation of the lubricant during operation of the lubricant enclosing device by a change in the molecular structure of the pH responsive substance according to the pH of the lubricant. Further, by using the lubricant containing the pH responsive substance and the additive added to the lubricant, the pH fluctuation of the lubricant can be grasped quickly.
Description
Technical Field
The invention relates to a lubricant enclosing device, a lubricant and an additive.
Background
A machine such as a gear device contains a lubricant to reduce friction generated in a sliding portion (hereinafter, the whole machine containing the lubricant is referred to as a "lubricant sealing device"). It is known that a lubricant gradually deteriorates depending on the use environment or the use conditions, and therefore a mechanism for suppressing deterioration of the lubricant is provided in the lubricant enclosing device.
For example, patent document 1 discloses the following: in a lubricant enclosing device (i.e., a quadrature reduction gear), in order to suppress deterioration of a lubricant due to a temperature rise, a space for accommodating the lubricant is enlarged or cooling is performed by cooling wind to suppress a temperature rise of the lubricant.
Prior art documents
Patent literature
Patent document 1: japanese patent laid-open No. 2003-113908
Disclosure of Invention
Technical problem to be solved by the invention
In addition to the study of suppressing the deterioration of the lubricant in the lubricant enclosing device as described in patent document 1, it is necessary to know how much the lubricant in the lubricant enclosing device is deteriorated.
Therefore, an object of the present invention is to provide a lubricant sealing device capable of detecting degradation of a lubricant in the lubricant sealing device. Another object of the present invention is to provide a lubricant and an additive which can detect deterioration of the lubricant.
Means for solving the technical problem
In order to solve the above problem, the present invention provides a lubricant enclosing device in which a lubricant is enclosed, wherein a pH responsive substance whose molecular structure changes in accordance with the pH of the lubricant is disposed at a portion that comes into contact with the enclosed lubricant.
According to the lubricant enclosing device of the present invention, by disposing the pH responsive substance in contact with the enclosed lubricant, the pH fluctuation of the lubricant can be grasped by the change in the molecular structure of the pH responsive substance according to the pH of the lubricant. That is, the pH fluctuation of the lubricant in the lubricant enclosing device can be grasped without extracting the lubricant from the lubricant enclosing device. This enables monitoring of pH fluctuation of the lubricant during operation of the lubricant enclosing device.
Further, an embodiment of the lubricant sealing device according to the present invention includes the following features: the color of the pH responsive substance varies according to the pH of the lubricant.
This feature makes it possible to grasp the pH fluctuation of the lubricant as a change in color. Thus, the pH variation of the lubricant can be monitored by a simple method.
Further, an embodiment of the lubricant sealing device according to the present invention has the following features: the lubricant enclosing device includes a housing and a confirmation window through which the inside of the housing can be confirmed, and the pH responsive substance is disposed at a position that can be confirmed through the confirmation window.
With this feature, the state relating to the change in the molecular structure of the pH responsive substance can be confirmed from the outside of the lubricant enclosing device, and the pH fluctuation of the lubricant can be grasped. This makes it possible to easily monitor pH fluctuation of the lubricant during operation of the lubricant enclosing device.
Further, an embodiment of the lubricant sealing device according to the present invention includes the following features: the confirmation window is an oil gauge for confirming the liquid level of the enclosed lubricant.
According to this feature, the structure for monitoring the pH fluctuation of the lubricant can be simplified by using the fuel gauge as a function of the confirmation window, and the pH fluctuation of the lubricant can be monitored at low cost.
Further, an embodiment of the lubricant sealing device according to the present invention includes the following features: the pH responsive substance remains in the confirmation window.
According to this feature, the state relating to the change in the molecular structure of the pH responsive substance according to the pH of the lubricant can be easily checked through the check window, and the pH fluctuation of the lubricant can be further easily monitored during the operation of the lubricant enclosing device.
Further, an embodiment of the lubricant sealing device according to the present invention includes the following features: the device is provided with a foreign matter removal mechanism for removing foreign matter from the lubricant before the lubricant comes into contact with the pH responsive substance.
According to this feature, it is possible to suppress the foreign matter contained in the lubricant from inhibiting the reaction between the pH responsive substance and the lubricant, and to remove the substance that causes the inhibition when the state relating to the structural change of the pH responsive substance is confirmed. This can improve the accuracy of monitoring pH fluctuation of the lubricant during operation of the lubricant enclosing device.
Further, an embodiment of the lubricant sealing device according to the present invention includes the following features: the lubricant enclosing device is a gear device having an input stage gear set and an output stage gear set, and the pH responsive substance is disposed at a position closer to the input stage gear set than the output stage gear set.
According to this feature, in the gear device, the pH responsive substance is disposed on the side where the rotation speed of the gear is faster (the input stage gear set side), whereby the pH variation of the lubricant can be monitored at a portion where the stirring efficiency of the lubricant is high. This enables monitoring of the pH variation of the lubricant at a location where the state of the lubricant is uniform, thereby improving the accuracy of the monitoring.
In order to solve the above problem, the present invention also provides a lubricant comprising a lubricating oil and a pH responsive substance whose molecular structure changes depending on pH.
According to this lubricant, in various devices having a sliding portion, friction and wear of the sliding portion can be suppressed, and pH fluctuation of the lubricant can be grasped quickly.
In order to solve the above problems, the present invention also provides an additive to be added to a lubricant, wherein the additive contains a pH responsive substance whose molecular structure changes according to pH.
According to this additive, by adding the additive to a lubricant, a lubricant that can quickly grasp pH fluctuation of the lubricant can be obtained.
Effects of the invention
According to the present invention, there is provided a lubricant enclosing device capable of monitoring pH variation of a lubricant during operation of the lubricant enclosing device. Also disclosed are a lubricant and an additive which enable the rapid determination of the pH fluctuation of the lubricant.
Drawings
Fig. 1 is a schematic explanatory view of a lubricant sealing device according to a first embodiment of the present invention.
Fig. 2 is a schematic explanatory view showing a configuration relating to the arrangement of the pH responsive material in the lubricant enclosing device according to the first embodiment of the present invention.
Fig. 3 is a schematic explanatory view showing a configuration relating to the arrangement of the pH responsive substance in the lubricant enclosing device according to the second embodiment of the present invention.
Fig. 4 is a schematic explanatory view showing a configuration relating to the arrangement of the pH responsive substance in the lubricant enclosing device according to the third embodiment of the present invention.
Detailed Description
The lubricant may be subjected to pH fluctuation due to oxidative degradation or mixing of water. Therefore, it is important to know the pH fluctuation of the lubricant. Conventionally, the following is a scheme for grasping the pH fluctuation of a lubricant enclosed in a lubricant enclosing device: the lubricant is extracted in a state where the operation of the lubricant enclosing device is stopped, and the pH of the extracted lubricant is analyzed by various analyzing devices.
However, it is not realistic to frequently stop the operation of the lubricant enclosing device and check the pH of the lubricant, and since it takes a certain time to analyze, it is difficult to grasp the pH fluctuation of the lubricant in real time.
The present inventors have conducted intensive studies to solve the above problems, and as a result, have found that: the present inventors have completed the present invention by bringing a lubricant into contact with a substance whose molecular structure changes depending on the pH of the lubricant, thereby enabling the pH fluctuation of the lubricant to be grasped in real time.
[ Lubricant encapsulating device ]
The lubricant sealing device of the present invention is not particularly limited as long as it is a device in which a lubricant is sealed in a mechanical device including various sliding portions such as gears, cams, and bearings so as to prevent damage, wear, friction, and the like of the sliding portions and a pH responsive substance can be disposed.
As the lubricant sealing device of the present invention, for example, a gear device is known.
The gear device is a mechanical device that increases or decreases the rotational speed of power by a gear or the like and outputs the power. As the output, a torque proportional to a reduction ratio such as a gear ratio or a pulley ratio can be obtained. The reduction gear of the gear device is mainly used for an output shaft of the prime mover, but may be used for a rear stage of the transmission like a final reduction gear of an automobile. In addition, when used in industrial and railway vehicles, the motor is often used in combination. In addition, the present invention is also used for driving a ship propeller (screw) or an airplane propeller (screw).
Specific examples of the lubricant enclosing device (gear device) of the present invention include a parallel shaft type reduction gear such as a parallel shaft gear reducer or a screw reducer, an orthogonal shaft type reduction gear such as a worm reduction gear reducer, a bevel gear reducer or a hypoid reduction gear reducer, an concentric shaft type reduction gear such as a planetary gear reducer, a wave gear reducer or an eccentric oscillating type reduction gear reducer, and a traction transmission type reduction gear such as a roller reduction gear.
In the following embodiments, the configuration of the gear device (parallel shaft type speed reduction device) will be mainly described as the lubricant sealing device, but the present invention is not limited to this.
[ Lubricant ]
The lubricant of the present invention is a lubricant capable of rapidly grasping pH fluctuation of the lubricant, and includes a lubricating oil and a pH responsive substance whose molecular structure changes according to the pH of the lubricant. That is, in the present specification, a substance having a lubricating component for suppressing friction or wear in a sliding portion in a device or for suppressing heat generation is referred to as "lubricating oil", and a substance in which a pH responsive substance is added as an additive to the lubricating oil is referred to as "lubricant".
According to this lubricant, in various mechanical devices having a sliding portion, friction and wear of the sliding portion can be suppressed, and pH fluctuation of the lubricant can be quickly grasped, and monitoring relating to deterioration of the lubricant can be accurately performed. That is, the mechanical device to which the lubricant of the present invention can be applied is not limited to the lubricant enclosing device, and can be applied to various mechanical devices having a sliding portion that contacts the lubricant without providing a space for enclosing the lubricant. For example, it can be applied to a cylinder device having a rod, a ball screw device, and the like.
(lubricating oil)
The lubricating oil is an oil that functions as a lubricating component for effectively lubricating sliding portions of mechanical devices such as gears and bearings of gear devices. As the lubricating oil, known oil or grease can be used, but the lubricating oil is not limited thereto.
Lubricating oils are roughly classified into, for example, mineral oils, synthetic oils, vegetable oils, and animal oils.
The mineral oil is a lubricating oil obtained by refining petroleum, and examples thereof include paraffin-based mineral oil, naphthene-based mineral oil, and the like.
The synthetic oil is a lubricating oil obtained by chemical synthesis, and examples thereof include: hydrocarbon-based synthetic oils such as polyalphaolefins, alpha-olefin oligomers, polybutenes, alkylbenzenes, naphthenes, and the like; ester-based synthetic oils such as monoesters, diesters, polyol esters, phosphoric esters, and silicic esters; ether-based synthetic oils such as polyethylene glycol and phenyl ether; fluorine-containing synthetic oils such as halocarbons.
The vegetable oil is a lubricating oil derived from a plant, and examples thereof include vegetable oils and fats such as palm oil, rapeseed oil, castor oil, soybean oil, linseed oil, sunflower seed oil, olive oil, coconut oil, palm kernel oil, rice oil, corn oil, or a fraction oil, hardened oil, or ester-exchanged oil thereof, polyoxyalkylene oils and fats, chlorinated oil, vulcanized oil, polymer oil, wax, fatty acid derivative, soap, esterified oil, amidated oil, and polyoxyalkylene adduct.
The animal oil is a lubricating oil derived from animals, and examples thereof include beef tallow, lard, mutton tallow, whale oil, sardine oil, herring oil, and milk fat.
(pH responsive substance)
The pH-responsive substance is not particularly limited as long as its molecular structure changes depending on pH. Here, the "molecular structure changes depending on pH" includes: depending on the change in pH (that is, the change in proton concentration around the substance), the bonding state in the molecular structure of the substance changes (in addition to bond formation/cleavage, a change from a single bond to a double bond or a change from a double bond to a single bond, etc.), or a part of the molecular structure of the substance is protonated or deprotonated, etc.
As the pH-responsive substance, a substance that can confirm a change in molecular structure due to pH by a simple method is preferably used. Also, it is preferable to use a substance in which the change in molecular structure based on pH is reversible. Thus, the pH change of the lubricant can be easily detected, and the pH change of the lubricant can be repeatedly checked without replacing or adding a pH responsive substance, thereby facilitating monitoring of the pH change of the lubricant.
In the present invention, it is assumed that maintenance work of the lubricant encapsulation device such as replacement of the encapsulated lubricant is performed at a stage where pH fluctuation of the lubricant is confirmed. Therefore, as the pH-responsive substance, a substance that can detect pH fluctuation of the lubricant without reversible change in the molecular structure based on pH may be used. Further, by replacing or adding the pH responsive substance together with the maintenance of the lubricant enclosing device, the pH fluctuation of the lubricant can be monitored.
Examples of the pH-responsive substance of the present invention include substances whose color changes depending on pH, substances whose various physical properties change depending on pH, and the like.
An example of a pH-responsive substance whose color changes depending on pH is quinone diimine represented by the following chemical formula (formula 1). In addition, in formula 1, the structural change of the pH responsive substance corresponding to the pH is shown in the order of the pH becoming higher from the left side toward the right side of the formula.
[ chemical formula 1]
Further, as another example of the pH responsive substance whose color changes depending on pH, bromothymol blue (formula 2) or anthocyanin (formula 3) shown by the following chemical structural formula can be given. In addition, in equations 2 and 3, as in equation 1, the structural change of the pH responsive substance according to the pH is shown in the order of increasing pH from the left side to the right side of the equation.
[ chemical formula 2]
[ chemical formula 3]
In the pH-responsive substances represented by formulas 1 to 3, a color change occurs due to a change in pH. Therefore, by detecting this color change, the pH change of the lubricant can be monitored.
Examples of the pH-responsive substance whose physical properties change depending on pH include a pH-responsive polymer or a pH-responsive gel having a leaving functional group such as a carboxyl group, a phosphate group, a sulfonyl group, or an amino group. It is known that such pH-responsive polymers or pH-responsive gels change physical properties such as solubility in a solvent, solvophilicity/solvophobicity, and structural volume due to pH fluctuation. Therefore, by detecting this change in physical properties, the pH variation of the lubricant can be monitored.
(other Components)
The lubricant of the present invention may contain, as other components, a detergent dispersant, an antioxidant, a load-bearing additive, a rust inhibitor, a preservative, a viscosity index improver, an anticoagulant, an antifoaming agent, an emulsifier, an anti-emulsifier, a fungicide, a thickener, and the like.
Hereinafter, an embodiment of the lubricant sealing device according to the present invention will be described in detail with reference to the drawings. The present embodiment is merely an example for explaining the lubricant sealing device according to the present invention, and the lubricant sealing device according to the present invention is not limited to this.
[ first embodiment ]
Fig. 1 is a schematic explanatory view of a lubricant sealing device according to a first embodiment. Fig. 1 (a) is a cross-sectional view when viewed from a side surface of the lubricant sealing device, and fig. 1 (B) is an external view when viewed from a side surface of the lubricant sealing device.
As shown in fig. 1, the lubricant enclosing device 100 includes an internal mechanism having a sliding portion, a housing 101 enclosing a lubricant 103, and a pH responsive substance arrangement mechanism 200 for arranging a pH responsive substance 20.
As an example of the lubricant sealing device 100, a parallel shaft type speed reducer may be mentioned. As shown in fig. 1a, a plurality of gears 121a to 121f (hereinafter, collectively referred to as "gears 121") are provided as an internal mechanism having a sliding portion in the housing 101, and a storage chamber 105 is provided as a space for storing the lubricant 103 in the housing 101. A plurality of shafts 107a to 107d (hereinafter, collectively referred to as "shafts 107") are provided substantially in parallel in the housing 101. The shaft 107 includes an input shaft 107a, a first gear shaft 107b, a second gear shaft 107c, and an output shaft 107d. Each shaft 107 is rotatably supported by the housing 101 via a bearing (not shown).
An access opening 111 for accessing the inside is provided in the casing 101. The access opening 111 is opened and closed by a lid member 113. The cover member 113 is detachably attached to the housing 101 by screws or the like. The housing 101 is provided with an oil gauge 115 for checking the level of the lubricant 103 from the outside.
The gear 121 is accommodated in the housing 101. The plurality of gears 121 include an input gear 121a, a first large diameter gear 121b, a first small diameter gear 121c, a second large diameter gear 121d, a second small diameter gear 121e, and an output gear 121f. An input gear 121a is fixed to the input shaft 107a to form an input stage gear set. The first large-diameter gear 121b and the first small-diameter gear 121c are fixed to the first gear shaft 107b, and the second large-diameter gear 121d and the second small-diameter gear 121e are fixed to the second gear shaft 107 c. Further, an output gear 121f is fixed on the output shaft 107d to form an output stage gear set. Each gear 121 is provided such that a part thereof is immersed in the lubricant 103.
The lubricant sealing device 100 according to the present embodiment is not limited to the one in which a plurality of gear sets (combinations of the gears 121b to 121e and the gear shafts 107b and 107 c) are provided between the input stage gear set and the output stage gear set as shown in fig. 1, as long as at least the input stage gear set (combination of the input gear 121a and the input shaft 107 a) and the output stage gear set (combination of the output gear 121f and the output shaft 107 d) are provided and function as a gear device.
The input shaft 107a is coupled to a motor (not shown). When the motor drives the input shaft 107a to rotate, the rotation is reduced by the plurality of gears 121 and transmitted to the output shaft 107d. By the rotation of the gear 121, the lubricant 103 is supplied to the gear 121, the shaft 107, and the bearing.
Here, it is known that the lubricant 103 is affected by temperature or moisture depending on the use environment or the use condition and is oxidized or hydrolyzed. For example, when grease is used as the lubricant 103, the grease is oxidized to generate an organic acid, and the pH of the lubricant 103 may be lowered. Further, when a sulfur-based additive is included as an additive of the lubricant 103, sulfuric acid is generated under the influence of temperature or moisture, and the pH of the lubricant 103 may be lowered. On the other hand, a thickener (particularly, a metal soap) contained as a component of the lubricant 103 (particularly, grease) generates hydroxide by hydrolysis, and thus the pH of the lubricant 103 may increase.
As the pH of the lubricant 103 decreases or increases, problems such as generation of insoluble components (i.e., sludge) and corrosion of the apparatus occur. Therefore, by monitoring the pH variation of lubricant 103 in real time, it is possible to reliably cope with the occurrence of a problem due to the pH variation of lubricant 103.
The pH responsive substance placement mechanism 200 in the present embodiment is used to place the pH responsive substance 20 in the casing 101 and bring the pH responsive substance 20 into contact with the lubricant 103. This causes a change in the molecular structure of the pH responsive substance 20 in response to a change in the pH of the lubricant 103, thereby enabling real-time monitoring of the pH change of the lubricant 103.
The specific configuration of the pH responsive substance arrangement mechanism 200 is not particularly limited as long as it can be arranged in the housing 101 so that the pH responsive substance 20 and the lubricant 103 are in contact with each other.
The form of the pH-responsive substance 20 disposed by the pH-responsive substance disposing mechanism 200 is not particularly limited. For example, the pH responsive substance 20 may be in any state of a solid (a molded body, a powder, etc.) or a liquid. Further, the pH responsive substance 20 may be disposed directly by the pH responsive substance disposition mechanism 200, or a substance in which the pH responsive substance 20 is carried on a carrier or the like may be disposed. The carrier carrying the pH-responsive substance 20 is not particularly limited. Examples of the carrier include a sheet, a pellet, and a molded body made of paper, resin, a porous material, and the like.
Fig. 2 is a cross-sectional view showing an example of a pH responsive substance arrangement mechanism in the lubricant enclosing device of the first embodiment.
As shown in fig. 2, as the pH responsive substance arrangement mechanism 200, a section a in which the pH responsive substance 20 can be arranged may be provided on the wall surface side in the housing 101. The section a is not particularly limited as long as the pH responsive substance 20 can be disposed and the outflow of the pH responsive substance 20 can be suppressed.
For example, as shown in fig. 2, a case 201 may be provided, and the case 201 may contain the pH responsive substance 20 and may include an inlet port 201a and an outlet port 201b for the lubricant 103. By disposing the pH responsive substance 20 in the section a formed by the case 201, the lubricant 103 can be brought into contact with the pH responsive substance 20. The inlet port 201a and the outlet port 201b of the case 201 may be provided separately as shown in fig. 2, or may be integrated with each other.
In this case, as shown in fig. 2, the pH responsive substance 20 is preferably a substance supported on a carrier (sheet or the like) or a molded body. This makes it possible to easily contain the pH responsive substance 20 in the case 201 and to easily suppress the outflow of the pH responsive substance 20 from the case 201.
The position where the pH responsive substance 20 is disposed by the pH responsive substance disposing mechanism 200 is not particularly limited. For example, the pH responsive substance 20 may be disposed at a position where the lubricant 103 and the pH responsive substance 20 can effectively contact each other, or the pH responsive substance 20 may be disposed at a position where the lubricant 103, such as the homogeneity of the lubricant 103, is in a state suitable for monitoring pH fluctuation, or the pH responsive substance 20 may be disposed at a position where a state relating to a change in the molecular structure of the pH responsive substance 20 is easily confirmed.
More specifically, when the lubricant enclosing device 100 is a gear device, as shown in fig. 1, the pH responsive substance 20 may be disposed on the input stage gear set (combination of the input gear 121a and the input shaft 107 a) side. Here, since pH responsive substance 20 is disposed on the side of the gear device where the rotation speed of the gear is high, the pH variation of lubricant 103 can be monitored at a portion where the stirring efficiency of lubricant 103 is high. This enables monitoring of the pH variation of lubricant 103 at a portion where the state of lubricant 103 is uniform, thereby improving the accuracy of monitoring.
The molecular structure of the pH responsive substance 20 disposed in the casing 101 by the pH responsive substance disposition mechanism 200 changes according to the pH of the lubricant 103 in contact therewith. Therefore, the pH change of the lubricant 103 can be monitored by checking the state related to the change in the molecular structure of the pH responsive substance 20.
The lubricant enclosing device 100 in the present embodiment preferably includes a confirmation means 210 for confirming a state relating to a change in the molecular structure of the pH responsive substance 20, thereby obtaining information relating to a pH change of the lubricant 103. This makes it possible to easily monitor pH fluctuation of the lubricant 103 during operation of the lubricant enclosing device 100.
As the confirmation mechanism 210, for example, a confirmation window 211 may be provided in the housing 101. In this case, the confirmation window 211 is preferably provided close to the pH responsive substance arrangement mechanism 200. This makes it possible to check the state relating to the change in the molecular structure of the pH responsive substance 20 from the outside of the lubricant enclosing device 100, and to grasp the pH fluctuation of the lubricant 103, and therefore, it is easy to monitor the pH fluctuation of the lubricant 103 during the operation of the lubricant enclosing device.
When the confirmation window 211 is provided as the confirmation means 210, the operator can visually confirm the pH fluctuation. This makes it possible to easily monitor the pH variation of the lubricant 103, and to quickly cope with the pH variation of the lubricant 103.
As a specific example of determining pH fluctuation by visually confirming the state relating to the change in the molecular structure of the pH responsive substance 20 from the confirmation window 211, for example, when the color of the pH responsive substance 20 changes depending on pH as in the pH responsive substances 20 shown in formulas 1 to 3, the determination can be made based on the color change in the visible light region. As another example, when the physical properties of the pH-responsive substance 20 change, such as a change in the solubility of the pH-responsive substance 20 in a solvent or a change in the solvent affinity/solvophobicity, which changes the refractive index, depending on the pH, the determination can be made visually in the form of transparentization/opacification. In addition, since the buoyancy of the pH responsive substance 20 changes when the volume of the pH responsive substance 20 changes according to the pH, it can be visually determined according to the degree of sinking or floating from the reference surface.
The confirmation window 211 in the present embodiment is preferably used as the oil amount meter 115 provided in the lubricant sealing device 100. That is, the pH responsive substance placement mechanism 200 is preferably provided close to the oil gauge 115. This can simplify the structure for monitoring the pH fluctuation of lubricant 103, and can monitor the pH fluctuation of lubricant 103 at low cost.
As another example of the confirmation means 210, a detection device for confirming a state related to a change in the molecular structure of the pH responsive substance 20 may be provided. More specifically, a device such as a camera capable of acquiring and analyzing image data, a device capable of acquiring and analyzing spectral data, or the like may be provided. The judgment of the pH fluctuation of the lubricant 103 can be performed in the same manner as the above-described visual judgment.
Here, when various detection devices are used as the confirmation means 210, the detection device may be provided at any position inside or outside the lubricant sealing device 100. For example, when the detection device is provided in the lubricant enclosing device 100, the state relating to the change in the molecular structure of the pH responsive substance 20 can be confirmed without providing the confirmation window 211. When the detection device is provided outside the lubricant enclosing device 100, the state relating to the change in the molecular structure of the pH responsive substance 20 can be checked through the check window 211.
When a detection device is used as the confirmation means 210, it is possible to easily automate the confirmation and determination of the state relating to the change in the molecular structure of the pH responsive substance 20, and to continuously monitor the pH variation of the lubricant 103.
As described above, according to the lubricant enclosing device of the present embodiment, by disposing the pH responsive substance in contact with the enclosed lubricant, it is possible to grasp the pH variation of the lubricant by the change in the molecular structure of the pH responsive substance according to the pH of the lubricant. That is, the pH fluctuation of the lubricant in the lubricant enclosing device can be grasped without extracting the lubricant from the lubricant enclosing device. This enables monitoring of the pH variation of the lubricant during operation of the lubricant enclosing device.
[ second embodiment ]
Fig. 3 is a schematic explanatory view of a pH responsive material arrangement mechanism in a lubricant enclosing device according to a second embodiment of the present invention. Fig. 3 is a cross-sectional view showing another example of the pH responsive substance arrangement mechanism 200 in the lubricant enclosing device 100 according to the first embodiment. The same structure as that of the first embodiment will not be described.
As shown in fig. 3, the lubricant enclosing device according to the second embodiment may be provided with a confirmation window 211 as a confirmation means 210, and the pH responsive substance arrangement means 200 may be provided with a holding means 203 for directly holding the pH responsive substance 20 in the confirmation window 211 (oil amount meter 115).
The holding mechanism 203 for holding the pH responsive substance 20 in the confirmation window 211 is not particularly limited. For example, the carrier carrying the pH responsive substance 20 may be stuck on the confirmation window 211, or the pH responsive substance 20 may be directly applied to the surface of the confirmation window 211. When the pH responsive substance 20 is stuck or applied to the confirmation window 211, the confirmation window 211 may be surface-treated with a chemical such as an adhesive to prevent the pH responsive substance 20 from being peeled off.
According to the lubricant enclosing device of the present embodiment, the state relating to the change in the molecular structure of the pH responsive substance according to the pH of the lubricant can be easily confirmed through the confirmation window, and the pH fluctuation of the lubricant can be further easily monitored during the operation of the lubricant enclosing device.
[ third embodiment ]
Fig. 4 is a schematic explanatory view of a pH responsive material arrangement mechanism in a lubricant enclosing device according to a third embodiment of the present invention. Fig. 4 is a cross-sectional view showing another example of the pH responsive substance arrangement mechanism 200 in the lubricant enclosing device 100 according to the first embodiment. The same structure as that of the first embodiment will not be described.
The lubricant 103 in the lubricant sealing device 100 may contain abrasion powder generated by driving of an internal mechanism (such as the gear 121). In order to improve the accuracy and precision of monitoring pH fluctuation of the lubricant 103, it is preferable to provide a foreign matter removing mechanism for removing foreign matter such as abrasion powder.
For example, as shown in fig. 4, the segment a may be formed using a filter 205 and a filter holder (not shown) as the pH responsive substance disposition mechanism 200. At this time, the filter 205 functions as a foreign substance removal means for removing foreign substances from the lubricant 103 before the contact with the pH responsive substance 20. Therefore, only the lubricant 103 containing no foreign matter (mainly, abrasion powder) can be introduced into the zone a and brought into contact with the pH responsive substance 20.
The filter 205 used as the foreign matter removing means may be any filter capable of capturing foreign matter such as abrasion powder, and for example, a device called a deep layer filter such as a nylon mesh filter, a polypropylene filter, or a glass fiber filter may be used.
According to the lubricant enclosing device of the present embodiment, it is possible to suppress foreign matter contained in the lubricant from inhibiting the reaction between the pH responsive substance and the lubricant, and to remove a substance that causes inhibition when a state relating to a structural change of the pH responsive substance is confirmed. This can improve the accuracy of monitoring the pH variation of the lubricant during the operation of the lubricant enclosing device.
The above embodiments show examples of the lubricant enclosing device, the lubricant, and the additive. The lubricant sealing device, the lubricant, and the additive according to the present invention are not limited to the above embodiments, and the lubricant sealing device, the lubricant, and the additive according to the above embodiments may be modified within a range not changing the gist described in the claims.
For example, in the lubricant sealing device of the present embodiment, the position where the pH responsive substance is disposed by the pH responsive substance disposing mechanism may be a position where the pH responsive substance can be replaced from the access opening of the housing. This makes it possible to replace the lubricant after detecting the pH variation of the lubricant, and also makes it easy to replace the pH responsive substance, thereby reducing the work cost required for monitoring the pH variation of the lubricant.
Further, as the lubricant enclosing device in the present embodiment, the pH responsive substance placement mechanisms in the second and third embodiments may be combined. This makes it easy to reduce the volume of the segment formed as the pH responsive substance placement mechanism, and to check the state of the pH responsive substance in relation to the change in the molecular structure thereof in response to the change in pH.
Industrial applicability
The lubricant sealing device of the present invention can be used as a mechanical device that seals a lubricant and includes various sliding portions. The lubricant sealing device of the present invention is suitably used as, for example, a gear device, a reduction gear device, or the like. In particular, the present invention can be used as a lubricant enclosing device that can monitor pH variation of a lubricant during operation of a machine and can accurately detect degradation of the lubricant.
The lubricant and the additive of the present invention can be used as a lubricant used for various mechanical devices for suppressing friction and wear of device components (particularly, sliding portions) and as an additive added to the lubricant. In particular, the compound is suitable for use as a lubricant and an additive which can easily monitor pH variation of the lubricant and can accurately detect deterioration of the lubricant.
Description of the symbols
100-lubricant enclosing device, 101-housing, 103-lubricant, 105-reservoir, 107 a-input shaft, 107b, 107 c-gear shaft, 107 d-output shaft, 111-access port, 113-cover member, 115-fuel gauge, 121 a-121 f-gear, 20-pH responsive substance, 200-pH responsive substance disposition mechanism, 201-housing, 201 a-inlet port, 201 b-outlet port, 203-holding mechanism, 205-filter (foreign matter removing mechanism), 210-confirmation mechanism, 211-confirmation window, a-section.
Claims (9)
1. A lubricant sealing device in which a lubricant is sealed, characterized in that,
a pH responsive substance having a molecular structure that changes in accordance with the pH of the lubricant is disposed at a portion that comes into contact with the enclosed lubricant.
2. The lubricant enclosing device according to claim 1,
the color of the pH responsive substance varies according to the pH of the lubricant.
3. The lubricant enclosing device according to claim 1 or 2,
the lubricant sealing device is provided with a housing and a confirmation window capable of confirming the interior of the housing,
the pH responsive substance is disposed at a site that can be confirmed from the confirmation window.
4. The lubricant enclosing device according to claim 3,
the confirmation window is an oil gauge for confirming the liquid level of the enclosed lubricant.
5. The lubricant enclosing device according to claim 3 or 4,
the pH responsive substance remains in the confirmation window.
6. The lubricant enclosing device according to any one of claims 1 to 5,
and a foreign matter removal mechanism that removes foreign matter from the lubricant before the lubricant comes into contact with the pH responsive substance.
7. The lubricant enclosing device according to any one of claims 1 to 6,
the lubricant sealing device is a gear device having an input stage gear set and an output stage gear set,
the pH response substance is configured at a position closer to the input stage gear set than the output stage gear set.
8. A lubricant characterized in that it is a lubricant,
comprises lubricating oil and pH responsive material with molecular structure changed according to pH.
9. An additive to be added to a lubricant, characterized in that,
the additive comprises a pH responsive substance whose molecular structure changes according to pH.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020043555A JP7284119B2 (en) | 2020-03-12 | 2020-03-12 | Lubricant containment device, lubricant and additive |
| JP2020-043555 | 2020-03-12 | ||
| PCT/JP2021/010199 WO2021182631A1 (en) | 2020-03-12 | 2021-03-12 | Lubricant-enclosing device, lubricant, and additive |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115298472A true CN115298472A (en) | 2022-11-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180020295.7A Pending CN115298472A (en) | 2020-03-12 | 2021-03-12 | Lubricant sealing device, lubricant, and additive |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP7284119B2 (en) |
| CN (1) | CN115298472A (en) |
| DE (1) | DE112021001636T5 (en) |
| WO (1) | WO2021182631A1 (en) |
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- 2021-03-12 WO PCT/JP2021/010199 patent/WO2021182631A1/en active Application Filing
- 2021-03-12 DE DE112021001636.9T patent/DE112021001636T5/en active Pending
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2021143737A (en) | 2021-09-24 |
| DE112021001636T5 (en) | 2022-12-29 |
| JP7284119B2 (en) | 2023-05-30 |
| WO2021182631A1 (en) | 2021-09-16 |
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