WO2018235293A1 - Graisse - Google Patents

Graisse Download PDF

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Publication number
WO2018235293A1
WO2018235293A1 PCT/JP2017/023288 JP2017023288W WO2018235293A1 WO 2018235293 A1 WO2018235293 A1 WO 2018235293A1 JP 2017023288 W JP2017023288 W JP 2017023288W WO 2018235293 A1 WO2018235293 A1 WO 2018235293A1
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WO
WIPO (PCT)
Prior art keywords
grease
resin
worm
motor
metal oxide
Prior art date
Application number
PCT/JP2017/023288
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English (en)
Japanese (ja)
Inventor
真也 飯尾
研介 木暮
今井　徹
Original Assignee
マブチモーター株式会社
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Application filed by マブチモーター株式会社 filed Critical マブチモーター株式会社
Priority to PCT/JP2017/023288 priority Critical patent/WO2018235293A1/fr
Publication of WO2018235293A1 publication Critical patent/WO2018235293A1/fr

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    • 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
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/06—Mixtures of thickeners and additives
    • 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
    • C10M115/00—Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof
    • C10M115/08—Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof containing nitrogen
    • 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
    • C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
    • C10M125/10—Metal oxides, hydroxides, carbonates or bicarbonates
    • 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
    • C10M145/00—Lubricating compositions characterised by the additive being a macromolecular compound containing oxygen

Definitions

  • the present invention relates to a grease.
  • a motor provided with a worm gear reducer having a worm and a worm wheel is known.
  • Such a motor with a reduction gear is used, for example, when it is used for a power window of an automobile that vertically opens and closes a window glass, in order to prevent the window glass from being opened by its own weight or vibration or being opened from the outside.
  • Reverse resistance is required as a characteristic of
  • a lubricant (mainly grease) is used at a portion where the worm and the worm wheel mesh with each other to prevent wear and seizing due to friction between parts. Therefore, in consideration of the gear transmission efficiency of the worm gear in the reduction gear motor, a lubricant having a smaller coefficient of friction between the worm and the worm wheel is preferable. On the other hand, lubricants with a low coefficient of friction are not always optimal with regard to the above-mentioned reversal resistance.
  • Patent No. 3466920 gazette
  • the present invention has been made in view of these circumstances, and an object thereof is to provide a new grease in which gear transmission efficiency and reverse resistance are taken into consideration.
  • grease of an embodiment of the present invention contains urea, crosslinked resin powder, and metal oxide powder.
  • cross-linked resin powder a plurality of metal oxide powders adhere to the surface.
  • This grease contains a crosslinked resin powder and a metal oxide powder.
  • a cross-linked resin powder a plurality of metal oxide powders adhere to the surface.
  • the content of the metal oxide powder is more than 10 wt% and 40 wt% or less.
  • new grease can be provided.
  • FIG. 1 It is a figure which shows schematic structure of a power window. It is a front view of a motor with a reduction gear concerning a 1st embodiment. It is a figure which shows the electron micrograph which image
  • the grease as a lubricant is a semi-solid material and has a viscosity that allows it to stay in a region requiring lubrication.
  • the motor with a reduction gear is used, for example, as a power window for automatically opening and closing a window glass of an automobile, an actuator for driving automobile electrical equipment such as an electric sunroof attached to a ceiling portion of a vehicle body, and the like.
  • FIG. 1 is a diagram showing a schematic configuration of a power window.
  • FIG. 2 is a front view of the motor with a reduction gear according to the first embodiment. In FIG. 2, parts of the worm reducer are shown in cross section.
  • the window glass 16 locked to the wire cable 14 is moved up and down as shown by the arrow B.
  • the drive current supplied from the battery 18 of the automobile is supplied to the motor with speed reducer 12 under the control of on / off control and switching control for forward and reverse rotation by the control circuit 20.
  • the speed reducer motor 12 rotates in the positive and reverse directions by the drive current to drive the power window 10.
  • the motor with a reduction gear 12 includes a motor unit 22 and a worm reduction gear 24 attached to the motor unit 22.
  • the output of the motor unit 22 is reduced by the worm reduction gear 24 and output.
  • a gear case side mounting portion 28 is provided on the gear case 26 of the worm reduction gear 24.
  • the flange portion 30 of the motor portion 22 is fastened and fixed to the gear case side attachment portion 28 by a screw 32.
  • a worm 36 is attached to the motor shaft 34 of the motor unit 22.
  • the tip end portion 38 of the motor shaft 34 is rotatably supported by the bearing 40 on the gear case 26.
  • a worm wheel 42 engaged with the worm 36 is rotatably provided inside the gear case 26, a worm wheel 42 engaged with the worm 36 is rotatably provided.
  • the worm wheel 42 may be configured by a helical gear.
  • An output shaft 44 is attached to the center of the worm wheel 42.
  • a worm gear 46 is configured by the worm 36 and the worm wheel 42.
  • the worm 36 is made of carbon steel for machine structure (S20C)
  • the worm wheel 42 is made of polyacetal (POM)
  • the gear case 26 is made of synthetic resin made of polybutylene terephthalate (PBT). It will be in mesh with the resin.
  • the motor unit 22 when the drive current is supplied from the battery 18 to the motor unit 22 by the control signal from the control circuit 20, the motor unit 22 is driven and the motor shaft 34 to rotate in the forward and reverse directions.
  • the driving torque of the motor shaft 34 is transmitted to the worm 36, and then transmitted from the worm 36 to the worm wheel 42 and the output shaft 44 and taken out from the output shaft 44.
  • the drive cable at the output shaft 44 moves the wire cable 14 of the power window 10 to automatically open and close the window glass 16.
  • the following items may be mentioned.
  • the window glass 16 can be repeatedly opened and closed, that is, the number of life cycles (corresponding to the life of the speed reducer motor 12) is large. (4) Motor noise is low and quiet.
  • the grease according to the present embodiment lubricates the meshing portion R1 of the worm 36 and the worm wheel 42 in the worm gear 46 of the worm reduction gear 24.
  • grease is designed with particular attention given to (1), and meets the seemingly contradictory requirements of achieving desired reverse resistance while achieving high transmission efficiency.
  • the outline of the composition of the grease will be described.
  • the grease which concerns on this Embodiment mainly contains a base oil, a thickener, and a solid additive, if it satisfy
  • the base oil is selected from synthetic oils and mineral oils. Synthetic oils include hydrocarbon oils and ester oils. Examples of hydrocarbon oils include poly- ⁇ -olefins, ethylene- ⁇ -olefin copolymers, polybutenes, alkylbenzenes and alkylnaphthalenes.
  • a thickener is a substance having the function of dispersing in a base oil to make the whole grease semisolid. Thickeners are roughly classified into soap-based (metal soap) and non-soap-based (urea). Examples of the metal soap include lithium (Li) soap, calcium (Ca) soap, aluminum (Al) soap, sodium (Na) soap and the like. As urea, aliphatic urea, aromatic urea, alicyclic urea etc. are mentioned.
  • Solid additives examples include crosslinked resins, inorganic compounds, and self-lubricating resins.
  • the crosslinked resin is a non-plasticizing resin, a thermosetting resin, or the like, and may be three-dimensionally crosslinked.
  • Specific cross-linked resins include cross-linked acrylic resins that are aliphatic, silicone resins, urea resins, polyurethane resins, and the like, phenol resins that are aromatic, cross-linked polystyrene resins, epoxy resins, melamine resins, benzoguanamine resins, and the like.
  • the metal oxide is contained in the inorganic type compound.
  • Specific metal oxides include titanium oxide (TiO 2 ), silicon oxide (SiO 2 ), aluminum oxide (Al 2 O, Al 2 O 3 ), zinc oxide (ZnO), zirconium oxide (ZrO 2 ), oxide Examples include magnesium (MgO 2 ) and cerium oxide (CeO 2 ).
  • nylon (PA: polyamide) resin, polyacetal (POM: polyoxymethylene) resin, polytetrafluoroethylene (PTFE) resin, ultra high molecular weight polyethylene (UHMWPE) resin, polyether ether ketone ( PEEK) resin, polybutylene terephthalate (PBT) resin, etc. are mentioned.
  • Transmission efficiency and anti-reverse performance were measured as performance evaluation of grease.
  • ⁇ Transmission efficiency> The transmission efficiency ⁇ [%] applies a predetermined amount of grease to the meshing portion R1 of the worm gear 46 of the motor 12 with a reduction gear, and the output torque T 1 (stopping torque Ts) of the motor unit 22 before decelerating From the output torque T 2 of the output shaft 44 (the torque that causes the output shaft not to rotate as well as the stoppage torque), the following equation is calculated.
  • Transmission efficiency [[%] (T 2 / (T 1 ⁇ reduction ratio)) ⁇ 100
  • the reduction ratio of the reduction gear motor 12 is 65, and can be calculated as the number of rotations of the worm necessary for one rotation of the worm wheel.
  • the advance angle of the worm 36 is about 6 °. Further, the measurement was carried out in three environments of ⁇ 40 ° C., normal temperature (eg, 25 ° C.) and 85 ° C.
  • ⁇ Reversing resistance performance In the evaluation of the reverse rotation resistance performance, when a torque of 20 Nm is applied in the direction of rotation of the output shaft 44, the output shaft 44 is judged to be acceptable if it does not rotate, and rejected if it is rotated. This measurement is performed at three speeds (low speed, medium speed, high speed) at the time of applying torque, and torque is applied in the forward direction and reverse direction at each speed. That is, the test is performed six times on one reduction motor 12. Then, by performing on the N reducer-equipped motors 12, a total of 3 ⁇ 2 ⁇ N results can be obtained.
  • the anti-reverse performance test was conducted in three environments of low temperature (-40 ° C.), normal temperature (eg 25 ° C.) and high temperature (85 ° C.). In addition, at normal temperature, the reverse rotation resistance test was also performed after the life test (20,000 cycles) on the assumption that the motor 12 with a reduction gear is applied to the power window 10.
  • the pass ratio of reversal resistance at low temperature is 100%, but the pass ratio of reversal resistance at normal temperature (after life test) or high temperature is 0% is there.
  • the pass rate of the reversal resistance performance in all environments of low temperature, normal temperature and high temperature is 100%.
  • the grease containing hydrocarbon oil, urea, a crosslinked resin, and a metal oxide can realize sufficient anti-reversal performance while maintaining the transmission efficiency of gears to a certain extent or more.
  • the pass ratio of the reverse resistance at low temperature is 100%, but the pass ratio of the reverse resistance at normal temperature or high temperature is 0%.
  • the pass rate of the reverse rotation resistance performance is improved.
  • the acrylic resin may be contained at least 0.1 wt% or more, and may be 1 wt% or more, preferably more than 5 wt%, and more preferably 10 wt% or more.
  • the content of the acrylic resin is at most 50 wt% or less, preferably 40 wt% or less, preferably 30 wt% or less, and more preferably 20 wt% or less.
  • the content of the acrylic resin is set when the lead angle is made small by emphasizing anti-reverse performance. Can be reduced.
  • the acrylic resin contained in the grease may be contained at least 0.1 wt% or more, preferably more than 0.4 wt%, more preferably It is good that it is 0.8 wt% or more.
  • the content of the acrylic resin is at most 3.2 wt% or less, preferably 2.4 wt% or less, and more preferably 1.6 wt% or less.
  • the pass ratio of the anti-reverse performance at low temperature is 100%, but the pass ratio of the anti-reverse performance at normal temperature and high temperature is 0%.
  • the pass rate of the reverse rotation resistance performance is improved.
  • the titanium oxide content is preferably at least 0.1 wt% or more, and preferably 1 wt% or more, preferably more than 5 wt%, and more preferably 10 wt% or more.
  • the content of titanium oxide is at most 40 wt% or less, preferably 30 wt% or less, more preferably 20 wt% or less.
  • the grease may contain at least 0.1 wt% or more of titanium oxide, preferably more than 0.4 wt%, more preferably It is good that it is 0.8 wt% or more.
  • titanium oxide is preferably contained at most 3.2 wt% or less, preferably 2.4 wt% or less, more preferably 1.6 wt% or less.
  • the pass rate of the anti-reverse performance at low temperature is 100%, the pass rate of the anti-reverse performance at normal temperature and high temperature is 0%.
  • the pass rate of the anti-reverse performance is improved.
  • the nylon resin which is a self-lubricating resin is preferably contained at least 0.1 wt% or more, and preferably 1 wt% or more, preferably 5 wt% or more.
  • the content of the nylon resin is at most 20 wt% or less, preferably 15 wt% or less.
  • the content of nylon resin is Can be reduced.
  • the nylon resin contained in the grease may be at least 0.1 wt% or more, preferably 0.4 wt% or more.
  • the content of nylon resin is at most 1.6 wt% or less, preferably 1.2 wt% or less.
  • the crosslinked resin contained in the grease is preferably in the range of 0.1 wt% to 40 wt%.
  • the metal oxide contained in the grease is preferably in the range of 0.1 wt% to 40 wt%.
  • the grease may comprise 0.2 wt% to 80 wt% of the total solid additive.
  • the proportion of the solid additive is too large, the amount of the base oil and thickener necessary for the grease characteristics becomes too small, so the solid additive should be 60 wt% or less with respect to the whole grease, preferably 50 wt%
  • the content is more preferably 40 wt% or less.
  • the ratio of the content of the metal oxide to the content of the crosslinked resin is preferably in the range of at least 0.025 to 40, preferably in the range of 0.167 to 6, and more preferably in the range of 0.5 to 2. It is good. Outside this range, the characteristics of one of the two solid additives become dominant, and the synergetic effect of using the two solid additives decreases.
  • the ratio of the content of the metal oxide to the content of the crosslinked resin is 15.
  • the ratio of the content of the metal oxide to the content of the crosslinked resin is 0.5.
  • the ratio of the content of the metal oxide to the content of the cross-linked resin is 0.066.
  • the ratio of the content of the metal oxide to the content of the crosslinked resin is 2.0.
  • the grease may have a crosslinked resin and a metal oxide as solid additives.
  • the average particle size of the crosslinked resin is 1 to 200 ⁇ m, preferably 5 to 100 ⁇ m, and more preferably 20 to 50 ⁇ m.
  • the average particle size of the metal oxide is 1 to 10000 nm, preferably 5 to 4000 nm, and more preferably 10 to 500 nm.
  • the greases F1 to F5 have an average particle size of the contained acrylic resin of 8 to 85 ⁇ m, and an average particle size of the contained titanium oxide of 15 nm.
  • the pass ratio of reversal resistance in a low temperature and high temperature environment is 100%, and particularly in the case of greases F1 to F3 containing an acrylic resin having an average particle diameter of less than 50 ⁇ m, low temperature, normal temperature, high temperature 100% pass rate for anti-reversal performance in all environments.
  • the greases F6 to F11 have an average particle diameter of contained titanium oxide of 10 to 290 nm and an average particle diameter of contained acrylic resin of 28 ⁇ m.
  • the pass ratio of the anti-reverse performance in all environments of low temperature, normal temperature and high temperature is 100%.
  • the average particle diameter of the nylon resin which is a self-lubricating resin is 1 to 200 ⁇ m, preferably 3 to 80 ⁇ m, and more preferably 5 to 30 ⁇ m.
  • the average particle diameter of the acrylic resin is the volume average diameter MV
  • the average particle diameter of the titanium oxide is the number average diameter MN
  • the average particle diameter of the nylon resin is the volume average diameter MV.
  • description is abbreviate
  • FIG. 3 is an electron micrograph showing a state in which an aggregate of titanium oxide having an average particle diameter of 15 nm is attached to the surface of an acrylic resin powder having an average particle diameter of 28 ⁇ m.
  • FIG. 4 is a view showing an electron micrograph of an enlarged view of one acrylic resin powder shown in FIG.
  • FIG. 5 is an electron micrograph showing a state in which an aggregate of silicon oxide having an average particle diameter of 7 nm is attached to the surface of an acrylic resin powder having an average particle diameter of 28 ⁇ m.
  • polygonal (indeterminate) titanium oxide or silicon oxide adheres as aggregates on the surface of the spherical acrylic resin powder.
  • the shape of the acrylic resin powder was also measured by observation with an electron microscope.
  • one acrylic resin powder in the field of view of an electron microscope had a minor axis ds of 25.460 ⁇ m, a major axis dl of 26.050 ⁇ m, and a ds / dl of 0.976.
  • the true-spherical or substantially spherical crosslinked resin powder used for the grease according to the present embodiment has ds / dl of 0.8 or more, preferably 0.9 or more, and more preferably 0.95 or more.
  • the acrylic resin which is a crosslinked resin has an apparent density of 0.59 to 0.63 g / ml, a tap density of 0.72 to 0.76 g / ml, and a true density of 1.1 to 1.2 g / ml.
  • the apparent density of the crosslinked resin used in the grease according to the present embodiment is 0.40 g / ml or more, preferably 0.45 g / ml or more, and more preferably 0.50 g / ml or more.
  • titanium oxide or silicon oxide which is a metal oxide powder has a non-spherical shape (polygon shape) having one or more corner portions.
  • the larger the particle diameter the larger the ratio of the minor diameter ds to the major diameter dl, the larger the apparent density, and the smaller the specific surface area. It tends to make the grease hard to harden even if the same amount is added.
  • the shape of the titanium oxide powder having an average particle diameter of 15 nm the average of the minor diameter ds was 12 nm, the average of the major diameter dl was 60 nm, and ds / dl was 0.20.
  • the metal oxide powder having a non-spherical shape having corner portions used in the grease according to the present embodiment has ds / dl of 0.05 or more, preferably 0.1 or more, and more preferably 0. 15 or more.
  • titanium oxide which is a metal oxide has an apparent density of 0.24 to 0.31 g / ml, a tap density of 0.47 g / ml, a true density of 4.27 g / ml, and a specific surface area of 90 m 2 / g.
  • the apparent density of the metal oxide used in the grease according to the present embodiment is 0.1 g / ml or more, preferably 0.15 g / ml or more, and more preferably 0.2 g / ml or more.
  • the specific surface area of the metal oxide used in the grease according to the present embodiment is 200 m 2 / g or less, preferably 150 m 2 / g or less, more preferably 100 m 2 / g or less.
  • the shape of the nylon resin which is a self-lubricating resin was also measured by observation with an electron microscope.
  • the nylon resin powder having an average particle diameter of 10 ⁇ m was spherical, and the minor diameter ds was 9.301 ⁇ m, the major diameter dl was 9.550 ⁇ m, and the ds / dl was 0.972.
  • the spherical or nearly spherical self-lubricating resin powder used for the grease according to the present embodiment has ds / dl of 0.8 or more.
  • nylon resin which is a self-lubricating resin, has an apparent density of 0.33 to 0.40 g / ml, a tap density of 0.53 g / ml, a true density of 1.02 g / ml, and a specific surface area of 0. It is 56 m 2 / g.
  • the average particle diameter of the acrylic resin which is a crosslinked resin powder is 20 times or more the average particle diameter of titanium oxide which is a metal oxide powder.
  • the number of particles of crosslinked resin (acrylic resin) powder per unit volume of grease is NA
  • the number of particles of metal oxide (titanium oxide) powder per unit volume of grease is NB
  • NA / NB 1/2000 or less.
  • the metal oxide powder is appropriately dispersed and present on the surface of the crosslinked resin powder.
  • the grease which concerns on this Embodiment contains urea, crosslinked resin powder, and metal oxide powder, as shown to grease A1. Further, as shown in FIGS. 3 to 5, in the crosslinked resin powder, a plurality of metal oxide powders adhere to the surface. Further, as shown in greases D4 to D10, the grease according to the present embodiment contains a crosslinked resin powder and a metal oxide powder. Further, as shown in FIGS. 3 to 5, in the crosslinked resin powder, a plurality of metal oxide powders adheres to the surface, and the content of the metal oxide powder is 10 to 40 wt% of the whole grease.
  • the worm gear 46 has a grease containing urea as a thickening agent at the engagement portion R1 like the above-mentioned grease A1 and the like. Further, the grease further contains a crosslinked resin powder, and the crosslinked resin is selected from the group consisting of acrylic resin, urea resin, polyurethane resin, phenol resin, polystyrene resin, epoxy resin, melamine resin, and benzoguanamine resin 1 Contains more than species of material.
  • the worm gear 46 also has a worm 36 and a worm wheel 42.
  • the grease is applied to an engagement portion R1 in which the worm 36 and the worm wheel 42 are engaged.
  • the grease further includes a metal oxide, and the metal oxide includes at least one material selected from the group consisting of titanium oxide, aluminum oxide, zinc oxide, zirconium oxide, magnesium oxide, and cerium oxide. There is.
  • the worm according to the present embodiment is configured such that the lead angle ⁇ is 2 ° ⁇ ⁇ 12 °, preferably 3 ° ⁇ ⁇ 10 °, more preferably 4 ° ⁇ ⁇ 8 °. It is configured to be Although increasing the lead angle ⁇ improves transmission efficiency, it works disadvantageously in terms of anti-reverse performance. However, by using the grease according to the present embodiment, the anti-reverse performance can be improved while maintaining the transmission efficiency without reducing the lead angle ⁇ .
  • Total amount of solid additive and lead angle of worm From the test results of various greases according to the present embodiment, it is derived that there is a tendency for the anti-reverse performance to be improved by increasing the solid additive to be contained in the grease.
  • the appropriateness of the total amount of solid additives may vary depending on the configuration of the worm gear. Therefore, without changing the ratio of cross-linked resin, metal oxide, and self-lubricating resin contained in the solid additive, a grease in which only the total amount of fixed additive is changed is prepared, and the lead angle of the worm is 5 ° or 6 The performance was evaluated with a motor with a reduction gear of °°.
  • the solid additive is an important component, it can be applied to a motor with a reduction gear with a wider range by appropriately selecting the total amount of the solid additive. It became clear.
  • the greases G1 to G4 are the same as the grease A1 except that they contain silicon oxide having an average particle diameter of 16 nm as a metal oxide. As shown in the test results of grease G1 to grease G3 in Table 16, when the content of silicon oxide having an average particle diameter of 16 nm is 1 to 5 wt%, the passing of the reversal resistance performance in all environments of low temperature, normal temperature and high temperature The rate is almost 100%. However, when the content of silicon oxide was 10 wt% as in grease G4, the grease was too hard to conduct the test.
  • greases G5 to G7 are the same as grease A1 except that they contain aluminum oxide having an average particle diameter of 13 nm as metal oxide. As shown in the test results of greases G5 to G7 in Table 16, when the content of aluminum oxide having an average particle diameter of 13 nm is 5 to 15 wt%, the passing of the anti-reverse performance in all environments of low temperature, normal temperature and high temperature The rate is 100%.
  • grease G8 to grease G10 are the same as grease A1 except that they contain zinc oxide having an average particle diameter of 50 nm as a metal oxide.
  • the pass ratio of the reversal resistance performance in a low temperature and high temperature environment is 100% It is.
  • the pass ratio of the anti-reverse performance in an environment at normal temperature is also 100%.
  • Greases H1 to H3 are the same as grease A1 except that they contain a phenol resin having an average particle diameter of 20 ⁇ m as a crosslinked resin. As shown in the test results of greases H1 to H3 in Table 18, when the content of the phenolic resin having an average particle diameter of 20 ⁇ m is 5 to 15 wt%, the pass ratio of reversal resistance in a low temperature and high temperature environment is 100%. It is. In particular, when the content of the phenolic resin is 15 wt%, the pass rate of the reversal resistance performance in a normal temperature environment is also 100%.
  • Greases H4 to H6 are the same as grease A1 except that they contain a polystyrene resin having an average particle diameter of 17 ⁇ m as a crosslinked resin. As shown in the test results of greases H4 to H6 in Table 18, when the content of polystyrene resin having an average particle diameter of 17 ⁇ m is 5 to 15 wt%, the pass ratio of the reversal resistance performance in a low temperature and high temperature environment is 100%. It is. In particular, when the content of the polystyrene resin is 15 wt%, the pass ratio of the anti-reverse performance in a normal temperature environment is also 100%.
  • compositions of grease K1 to grease K27 are shown in Table 19. Further, the results of the static friction coefficient and the dynamic friction coefficient of grease K1 to grease K27 are shown in Table 20. Further, the results of transmission efficiency and reverse rotation resistance performance of grease K2 to grease K5 and grease K8 are shown in Table 21.
  • the dynamic friction coefficient and the static friction coefficient decrease at normal temperature and high temperature as the solid additive decreases.
  • the grease K14 has the same coefficient of friction as the composition of the solid additive but with different thickeners (a thickener is an alicyclic urea) and a grease K14 (a thickener is a lithium soap). It is less than half the coefficient of friction of the grease K1. Therefore, it can be seen that urea, which is a thickener, affects the increase in the coefficient of friction.
  • grease K9 to grease K14 containing lithium soap as a thickener and grease K25 containing only a base oil have low coefficient of friction, and the additive has an influence on the increase in coefficient of friction. I understand that there is not.
  • grease K20 to grease K24 (thickener is aliphatic urea or aromatic urea) containing the same solid additive as grease K1 (thickener is alicyclic urea), and lithium soap is used as a thickener.
  • the friction coefficient is larger than that of a certain grease K14. Also, depending on whether the thickener is an alicyclic urea, an aliphatic urea or an aromatic urea, there is no significant difference in the coefficient of friction.
  • the amount of thickener added to each grease is adjusted so that the JIS consistency of the grease is 2 (blend consistency 265 to 295).
  • the preferable JIS consistency of the grease according to the present embodiment may be at least in the range of 0 to 3.
  • the range of the blending amount of the thickener is, for example, 2 to 30 wt%, preferably 5 to 25 wt%, more preferably 8 to 20 wt%.
  • the greases L1 to L8 contain lithium soap as a thickening agent, but all have a low pass rate of the anti-reverse performance in an environment of normal temperature and high temperature.
  • FIG. 6 is a view schematically showing an example of the grease according to the present embodiment.
  • Grease 50 shown in FIG. 6 includes base oil 52 such as poly- ⁇ -olefin, thickener 54 such as alicyclic urea, crosslinked resin 56 such as acrylic resin powder, and metal oxide 58 such as titanium oxide powder. And a self-lubricating resin 60 such as nylon resin powder.
  • Urea used as the thickening agent 54 is expected to have high friction at high contact pressure.
  • alicyclic urea has a steric structure, and when pressure is applied, it is considered that the friction is increased due to the molecules sticking to each other.
  • crosslinked resin 56 is generally hard, difficult to be broken or crushed by pressure, and is considered to contribute to the maintenance of stable properties over a long period of time.
  • titanium oxide which is the metal oxide 58
  • the acrylic resin powder which is the crosslinked resin 56. This is considered to improve the anti-reverse performance.
  • the metal oxide 58 in order for the metal oxide 58 to cover the cross-linked resin 56 relatively uniformly, it is important that the size of the metal oxide 58 be sufficiently smaller than the size of the cross-linked resin 56.
  • the grease containing urea as the thickening agent 54, the cross-linked resin 56, and the metal oxide 58 can improve the anti-reverse performance. Furthermore, by adding the self-lubricating resin 60 to such a grease 50, the transmission efficiency is improved.
  • the size of the acrylic resin powder and the size of the nylon resin powder included in the grease according to the present embodiment are about several times different. Therefore, the acrylic resin powder and the nylon resin powder do not adhere to each other to cover the other, and a situation in which titanium oxide having a relatively small particle diameter covers the acrylic resin powder can be realized (see FIG. 6).
  • the reducer-equipped motor 12 shown in FIG. 2 includes a motor unit 22 and a worm gear 46 as a reduction mechanism having a gear for reducing the output of the motor unit 22 and transmitting the output to the output shaft 44.
  • the worm gear 46 has a first grease applied to the meshing portion R ⁇ b> 1 of the worm gear 46 for suppressing the reverse rotation of the motor by the rotational force input from the output shaft 44.
  • the first grease preferably contains urea as a thickening agent based on the test results of Grease K1 to Grease K7 and Grease K20 to Grease K24.
  • the coefficient of static friction at normal temperature of the grease is 20% or more larger than the coefficient of dynamic friction at normal temperature (see Table 20). That is, the coefficient of static friction which is considered to mainly affect the anti-reverse performance is large, and the coefficient of dynamic friction which is considered to mainly affect the transmission efficiency during the operation of the motor can be made relatively small.
  • the reduction gear motor has a transmission efficiency of 40% or more at normal temperature while satisfying the reverse rotation resistance performance.
  • the sliding portion between the parts is not limited to the worm gear 46 alone.
  • a portion (protrusion or support shaft) for rotatably supporting the worm wheel 42 is at the bottom of the gear case 26, and the second portion is for smooth sliding of that portion and the supported portion of the worm wheel 42.
  • Grease is applied to region R2 of FIG.
  • the second grease may be selected in consideration of the transmission efficiency rather than the reverse rotation resistance, and may be, for example, a grease (grease L2, grease J8) not containing urea as a main component of the thickener. As described above, by selectively using the grease in the plurality of sliding portions of the reduction gear motor, it is possible to realize the transmission efficiency and the reverse rotation resistance at a higher level.
  • Second Embodiment By using various greases according to the first embodiment, it is possible to realize a motor with a reduction gear that satisfies the reverse rotation resistance performance without significantly reducing the transmission efficiency. However, it may be difficult to achieve both the transmission efficiency and the reverse rotation resistance before and after the use environment and the life of the motor with a reduction gear.
  • the motor with a reduction gear includes a motor and a reduction mechanism having a gear that decelerates the output of the motor and transmits the output to the output shaft.
  • the reduction mechanism is provided in a torque transmission path between the output shaft and the drive shaft of the motor, and the reverse rotation prevention mechanism that suppresses the reverse rotation of the drive shaft of the motor by the rotational force input from the output shaft, and the gear meshing And grease which is applied to the part and which suppresses the reverse rotation of the drive shaft of the motor by the rotational force inputted from the output shaft.
  • the grease is selected from, for example, various greases listed in the first embodiment.
  • the motor with a reduction gear is similar in general configuration to the motor with a reduction gear 12 according to the first embodiment.
  • a reverse rotation preventing mechanism a worm gear having a worm whose surface is roughened by shot blasting, a worm gear having a worm whose advancing angle is reduced to secure reverse rotation resistance performance, and a meshing portion between a worm and a worm wheel And sliding parts etc. in which the friction coefficient between parts is high to some extent.
  • One example of a method of roughening the surface of the worm is to perform shot blasting at the stage of the single component before the worm is press-fitted into the motor shaft.
  • a surface roughness of about 2 to 10 ⁇ m with Rz (10-point average roughness) can be given to the tooth surface of the worm. Thereafter, electroless nickel plating is formed on the worm surface to maintain its surface roughness, and a baking process is performed to further increase the surface hardness.
  • the specifications of the motor with a reduction gear to which the grease according to the above embodiment is applied include, for example, a reduction ratio of 50 to 150, a diameter of a worm wheel of 20 to 75 mm, a diameter of a worm of 3 to 20 mm, a stalling
  • the torque Ts is about 5 to 20 Nm
  • the Is is about 10 to 50 A, but of course it is not limited to this range.
  • the present invention can be used, for example, for a motor with a reduction gear.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)
  • Power Steering Mechanism (AREA)

Abstract

L'invention concerne une graisse 50 comprenant de l'urée, une poudre de résine réticulée et une poudre d'oxyde métallique. Des particules de la poudre de résine réticulée ont, collées sur les surfaces, une pluralité de particules de la poudre d'oxyde métallique.
PCT/JP2017/023288 2017-06-23 2017-06-23 Graisse WO2018235293A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06271882A (ja) * 1993-03-23 1994-09-27 Haiosu Technol Kk 石英超微粒子を使用する潤滑用材
JP2005068316A (ja) * 2003-08-26 2005-03-17 Nsk Ltd 潤滑剤、樹脂潤滑用グリース組成物及び電動パワーステアリング装置
JP2005247971A (ja) * 2004-03-03 2005-09-15 Nsk Ltd 樹脂潤滑用グリース組成物、ギア装置及び電動パワーステアリング装置
JP2005263989A (ja) * 2004-03-18 2005-09-29 Koyo Seiko Co Ltd 潤滑剤組成物とそれを用いた減速機ならびにそれを用いた電動パワーステアリング装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06271882A (ja) * 1993-03-23 1994-09-27 Haiosu Technol Kk 石英超微粒子を使用する潤滑用材
JP2005068316A (ja) * 2003-08-26 2005-03-17 Nsk Ltd 潤滑剤、樹脂潤滑用グリース組成物及び電動パワーステアリング装置
JP2005247971A (ja) * 2004-03-03 2005-09-15 Nsk Ltd 樹脂潤滑用グリース組成物、ギア装置及び電動パワーステアリング装置
JP2005263989A (ja) * 2004-03-18 2005-09-29 Koyo Seiko Co Ltd 潤滑剤組成物とそれを用いた減速機ならびにそれを用いた電動パワーステアリング装置

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