WO2018164014A1 - 保持器付き針状ころおよびそれを備えた遊星歯車機構支持構造 - Google Patents

保持器付き針状ころおよびそれを備えた遊星歯車機構支持構造 Download PDF

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Publication number
WO2018164014A1
WO2018164014A1 PCT/JP2018/008151 JP2018008151W WO2018164014A1 WO 2018164014 A1 WO2018164014 A1 WO 2018164014A1 JP 2018008151 W JP2018008151 W JP 2018008151W WO 2018164014 A1 WO2018164014 A1 WO 2018164014A1
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WO
WIPO (PCT)
Prior art keywords
roller
cage
diameter side
needle roller
planetary gear
Prior art date
Application number
PCT/JP2018/008151
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
理之 冨加見
将 土屋
Original Assignee
Ntn株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2017041758A external-priority patent/JP6804341B2/ja
Priority claimed from JP2017164349A external-priority patent/JP2019039550A/ja
Application filed by Ntn株式会社 filed Critical Ntn株式会社
Priority to KR1020197024721A priority Critical patent/KR102508641B1/ko
Priority to CN201880015863.2A priority patent/CN110382891B/zh
Publication of WO2018164014A1 publication Critical patent/WO2018164014A1/ja

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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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/44—Needle bearings
    • F16C19/46—Needle bearings with one row or needles
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/34—Rollers; Needles
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/46—Cages for rollers or needles
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • 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
    • F16H—GEARING
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion

Definitions

  • the present invention relates to a needle roller with a cage and a planetary gear mechanism support structure having the needle roller.
  • the needle roller with a cage includes a plurality of needle rollers and a cage, and the cage includes a pair of annular portions spaced in the axial direction and a plurality of axial portions that extend in the axial direction and connect the annular portions to each other. It has a pillar part. And a needle roller is hold
  • the length of the inclined surface portion can be adjusted so that the boundary portion between the cylindrical surface portion and the inclined surface portion does not contact the guide surface, and an attempt is made to provide a roller with a long life. Is.
  • an inner protrusion and an outer protrusion that prevent the rollers from falling off are provided on the inner diameter side and the outer diameter side on both sides in the axial direction of the column portion.
  • a crowning roller including a central straight portion (cylindrical surface portion) and crowning portions (inclined surface portions) on both sides thereof is used as the roller.
  • the inner side protrusion part and the outer side protrusion part of the pillar part are provided in the crowning part side rather than the joint (boundary part) of a straight part (cylindrical surface part) and the crowning part (inclined surface part) of the both sides.
  • the gap between the roller outer peripheral surface and the inner and outer projections of the column portion is widened. Therefore, the inner protrusion and the outer protrusion do not scrape the lubricant on the outer surface of the roller, and dust such as metal wear powder mixed in the lubricant does not stay in the inner protrusion and the outer protrusion. Therefore, the lubricating oil flows smoothly through the gap between the roller and the pocket.
  • rollers with cages needle rollers with cages
  • maintains a roller is comprised by the 1st linear part located in the radial direction outer side in a pillar part. In this case, it is necessary to make it smaller than the roller diameter so that the roller does not fall off.
  • the clearance between the roller stopper portion and the roller becomes small, so that it is difficult for the lubricating oil to enter, and wear and peeling due to poor lubrication are likely to occur.
  • both the inner side protrusion part and outer side protrusion part which are roller stoppers are in the axial direction both sides of a pillar part, and it exists in the substantially the same position in an axial direction, there exists a concern that the inflow property of lubricating oil may worsen There is.
  • both the inner protrusion and the outer protrusion which are roller stoppers, are on both sides in the axial direction of the column part, and are substantially at the same position in the axial direction. There is a concern that the influx of water will worsen.
  • the present invention prevents the roller from falling off without the occurrence of poor lubrication at the high edge surface pressure portion, suppressing the occurrence of wear and peeling, and without impairing the inflow of lubricating oil.
  • the present invention provides a needle roller with a retainer and a planetary gear mechanism support structure including the same.
  • the needle roller with cage of the present invention is a needle roller with cage comprising a plurality of needle rollers and a cage, wherein the cage has a pair of annular portions spaced in the axial direction and an axial direction.
  • a plurality of column portions that connect the annular portions to each other, and the retainer includes an outer diameter side roller stopper provided at an outer diameter side of the roller pitch circle diameter at both axial ends, and a shaft
  • An inner diameter side roller stopper provided at an inner diameter side of the roller pitch circle diameter at a central portion in the direction, and the outer diameter side roller stopper and the inner diameter side roller stopper are disposed so as not to overlap in the axial direction.
  • the tapered roller is a crowning roller having a cylindrical surface portion having a constant diameter in a central region and inclined surface portions on both sides of the cylindrical surface portion, and a boundary portion between the cylindrical surface portion and the inclined surface portion of the needle roller is disposed outside the cage. It is arranged between the diameter side roller stopper and the inner diameter side roller stopper, and the needle roller cylinder Boundary portion between the parts and the inclined surface portion in which is said retainer and non-contact.
  • the cage has an outer diameter side roller stopper and an inner diameter side roller stopper, so that the needle roller can be effectively prevented from falling off.
  • the boundary portion between the cylindrical surface portion and the inclined surface portion of the roller is more than the roller stop portion on the outer diameter side so that it does not overlap in the axial direction with the roller stop portion for preventing the roller from dropping off from the cage to the outer diameter. Since it is arranged so as to be on the axial center side, the high edge surface pressure portion is unlikely to be poorly lubricated. Moreover, even if the crowning length is long, it is not difficult to assemble when assembling to the mounted shaft or housing inner diameter.
  • the boundary portion between the cylindrical portion and the inclined portion of the roller is disposed so as to be on both ends in the axial direction with respect to the inner diameter side roller stopper, so that the high edge surface pressure portion is unlikely to be poorly lubricated.
  • the axial position of the boundary part between the cylindrical part and the inclined part of the roller is the connection part (inclined part) between the outer diameter side roller stopper and the inner diameter side roller stopper of the cage. This part is in contact with the cage. It has a configuration that does not. This makes it difficult for the high edge surface pressure portion to be poorly lubricated.
  • the cage has an inclined connecting portion for connecting the outer diameter side roller stopper and the inner diameter side roller stopper, and the inclined connecting portion has a thin shape that avoids interference with the needle rollers.
  • a pocket in which needle rollers are arranged is formed between the column portions adjacent to each other in the circumferential direction of the cage, and the pocket is radially expanded from the inner diameter side to the outer diameter side.
  • the cage may be a welded joint of steel plates with punched pockets.
  • the roller bearing has an advantage that the load capacity is high because the roller as the rolling element and the raceway surface are in line contact.
  • contact pressure concentration called edge load is likely to occur at the end of the effective contact portion between the roller and the raceway surface, and if this is excessive, the bearing life is reduced.
  • a crowning with a non-linear busbar shape is formed on at least one of the outer circumferential surface (rolling surface), outer ring raceway surface, or inner ring raceway surface of the roller. It is common to do.
  • the shape of the busbar of the crowning is represented by a logarithmic curve.
  • the said needle roller is the logarithmic crowning shape of the shape approximated by a logarithmic function, for example.
  • the needle roller is a needle roller of a crowning roller having a logarithmic crowning shape approximated by a logarithmic function.
  • One of the generatrixes of the surface is the y-axis, and the z-axis is taken in the direction perpendicular to the generatrix, and is expressed by Equation 1, and the axial length of the cylindrical surface portion is 40% of the total roller length. It is preferable to set it to 70%.
  • Equation 1 is expressed by the following Equation 2, and a is the length from the origin taken on any of the inner ring raceway surface, outer ring raceway surface or roller rolling surface to the end of the effective contact portion. That's it.
  • the needle roller configured in this way does not have an excessive contact surface pressure even when the bearing tilt is small, and edge load hardly occurs even when the bearing tilt is large.
  • the cage may be M-type having an inward flange at the outer end of the annular part or V-type not having an inward flange at the outer end of the annular part.
  • the planetary gear mechanism support structure of the present invention includes an internal gear, a sun gear disposed at the center of the internal gear, a plurality of planetary gears meshed with the internal gear and the sun gear, and the planetary gear.
  • a support structure for supporting a planetary gear mechanism including a carrier for supporting a gear, wherein the planetary gear is rotatably supported on a pinion shaft provided on the carrier via a rolling bearing, and the rolling bearing is provided. Is constituted by the needle roller with a cage.
  • the planetary gear mechanism support structure of the present invention uses the needle roller with a cage for the rolling bearing, the needle roller can be effectively prevented from falling off. Moreover, even if the crowning length is long, it is not difficult to assemble when assembling to the shaft or the housing inner diameter. Moreover, it can reduce that the inflow property of lubricating oil worsens. Furthermore, the high edge surface pressure portion is less likely to be poorly lubricated.
  • the outer diameter surface of the pinion shaft is the inner raceway surface
  • the inner diameter surface of the planetary gear is the outer ring raceway surface
  • the cage used for the needle roller with cage is an inner diameter of the planetary gear at both ends in the axial direction.
  • An oil passage hole that is in contact with the outer ring raceway surface constituted by a surface and that opens in the inner raceway surface constituted by the outer diameter surface of the pinion shaft can be provided inside the pinion shaft.
  • the needle roller for the cage can be lubricated.
  • the raceway guide is preferable to the roller guide from the viewpoint of the safety of the cage motion under high speed motion, and the outer ring guide is more preferable than the inner ring guide from the viewpoint of lubricating oil behavior due to centrifugal force. preferable.
  • the planetary gear mechanism support structure can be used for automobile transmissions.
  • the amount of lubricating oil is small because of the structure that enters the oil passage hole of the pinion shaft (support shaft) by splashing. Therefore, it is optimal to use this planetary gear mechanism support structure for an automobile transmission.
  • the high edge surface pressure portion is unlikely to be poorly lubricated, the occurrence of wear and peeling can be suppressed, and the deterioration of the inflow property of the lubricating oil can be effectively prevented.
  • the suitable needle roller with a retainer excellent in durability can be provided.
  • the assemblability is excellent when assembling to the shaft or the housing inner diameter.
  • FIG. 3 is an enlarged sectional view taken along line AA in FIG. 2. It is a side view of the needle roller of the needle roller with a cage of the present invention. It is a principal part expanded sectional view of other embodiment of a holder
  • FIG. 1 shows a needle roller 30 with a cage.
  • the needle roller 30 with a cage is configured by assembling a plurality of needle rollers 1 to a cage 2.
  • the direction along the central axis of the needle roller 30 with cage is “axial direction”
  • the direction orthogonal to the central axis is “radial direction”
  • the direction along the arc centered on the central axis is This is called “circumferential direction”.
  • the cage 2 includes a pair of annular portions 3 and 3 that are spaced apart in the axial direction, and a plurality of column portions 4 that extend in the axial direction and connect the annular portions 3 and 3 to each other.
  • a plurality of pockets 5 having a shape as shown in FIG. 3 is formed between the column parts 4 and 4 adjacent to each other along the circumferential direction, and the needle rollers 1 are disposed in the pockets 5.
  • the cage 2 has a substantially M-shaped cross section. Since the cage 2 has such a cross sectional shape, the cage 2 of this embodiment is called an M-type cage.
  • the M-type cage has an inward flange 3 a at the outer end of the annular portion 3.
  • the pillar portion 4 includes a pair of outer diameter portions 4a and 4a, an inner diameter portion 4b, and an inclined portion 4c.
  • the outer diameter portion 4 a extends inward in the axial direction from each outer diameter portion of the pair of annular portions 3.
  • the inner diameter portion 4b is disposed between the pair of annular portions 3 and 3 and on the inner diameter side with respect to the outer diameter portion 4a.
  • the inclined portion 4c connects the outer diameter portion 4a and the inner diameter portion 4b.
  • an outer diameter side retainer (hereinafter also referred to as an outer diameter side roller stopper) 6 is formed on the outer diameter portion 4a, and an inner diameter side retainer (hereinafter referred to as an inner diameter side roller) is formed on the inner diameter portion 4b. 7 is also formed.
  • the outer diameter side stopper 6 includes an inner diameter side taper portion 6a that protrudes from the inner diameter side toward the outer diameter side into the pocket 5, and an outer diameter side taper portion that protrudes from the outer diameter side toward the inner diameter side into the pocket 5. 6b.
  • the needle roller 1 disposed in the pocket 5 is received by the inner diameter side taper portion 6a.
  • the inner diameter side stopper 7 includes an outer diameter side taper portion 7a protruding into the pocket 5 from the outer diameter side toward the inner diameter side, and an end surface portion extending radially inward from the inner diameter end of the outer diameter side taper portion 7a. 7b.
  • the needle roller 1 disposed in the pocket 5 is received by the inner diameter side taper portion 6a and the outer diameter side taper portion 7a. If the amount of movement of the roller 1 relative to the cage 5 can be ensured, the inner diameter side taper portion 6a and the outer diameter side taper portion 7a may not be provided.
  • the needle roller 1 includes a cylindrical surface portion 10 having a constant diameter in a central region, and inclined surface portions (hereinafter also referred to as crowning portions) 11 provided on both sides of the cylindrical surface portion 10. It is a crowning roller.
  • a roller bearing has an advantage that a load capacity is high because a roller as a rolling element is in line contact with a raceway surface.
  • surface pressure concentration called edge load is likely to occur at the end of the effective contact portion between the roller and the raceway surface. If this is excessive, attention should be paid to shortening the bearing life.
  • a crowning with a non-linear busbar shape is formed on at least one of the outer circumferential surface (rolling surface), outer ring raceway surface, or inner ring raceway surface of the roller. It is common to do.
  • the crowning shape of the crowning is represented by a logarithmic curve as the crowning that suppresses the edge load and makes the contact surface pressure uniform.
  • the needle roller 1 of the needle roller 30 with a retainer according to the present embodiment has, for example, a logarithmic crowning shape having a shape approximated by a logarithmic function.
  • the logarithmic crowning applied to the needle roller 1 will be described.
  • the buses of the crowning portions 11b and 11b of the rolling surface 1a of the needle roller 1 are obtained based on a logarithmic curve of logarithmic crowning expressed by the following equation (Equation 1).
  • Equation 1 the logarithmic crowning equation, the one described in Japanese Patent No. 4429842 of the present applicant is cited.
  • the contour line of the crowning in the axial cross section of the roller bearing is defined as y-axis where the generatrix of any of the inner ring raceway surface, the outer ring raceway surface or the roller rolling surface is the y-axis, and the z-axis is perpendicular to the generatrix. This is expressed by Equation 1 using the z coordinate system.
  • Equation 3 A is expressed by the following Equation 4, and a is the length from the origin on any of the inner ring raceway surface, outer ring raceway surface or roller rolling surface to the end of the effective contact portion. is there.
  • Design parameters K 1 , K 2, and z m in the above logarithmic crowning equation are designed.
  • a mathematical optimization method for logarithmic crowning is described.
  • An optimal logarithmic crowning can be designed by appropriately selecting K 1 and z m in a functional expression representing logarithmic crowning after defining the design parameter K 2 .
  • Crowning is generally designed to reduce the maximum surface pressure or stress at the contact.
  • K 1 and z m are selected so as to minimize the maximum value of the equivalent stress of Mises.
  • K 1 and z m can be selected using an appropriate mathematical optimization method.
  • Various algorithms for mathematical optimization methods have been proposed.
  • One of the direct search methods is that optimization can be performed without using the derivative of the function. Useful when functions and variables cannot be directly represented by mathematical expressions.
  • K 1 and z m are obtained by using Rosenblock method which is one of direct search methods.
  • the shape of the crowning portions 11, 11 of the needle roller 1 in the present embodiment is a logarithmic curve crowning obtained by the above formula. By setting in this way, the contact surface pressure can be kept small even when the shaft on which the needle roller 30 with cage is mounted has an inclination or the like, and the life can be extended.
  • the logarithmic shape is not limited to the above mathematical formula, and a logarithmic curve may be obtained using another logarithmic crowning formula.
  • the crowning portion 11 of the needle roller 1 is crowned by machining or barrel machining.
  • the barrel processing is a process in which needle rollers and an abrasive are put in a basket and crowning portions are formed at both ends of the needle rollers.
  • the drop amount from the outer peripheral surface of the cylindrical surface portion 10 is, for example, 0.5 ⁇ m.
  • the boundary portion 12 is preferable.
  • the linear part (cylindrical surface part 10) of the needle roller 1 will also drop in a trace amount on a process, and the definition of a linear part will become difficult. For this reason, it is preferable to define the position which dropped 0.5 micrometer from the outermost diameter part of the needle roller 1 as a crowning start point (boundary part of the cylindrical surface part 10 and the inclined surface part 11).
  • the axial length L1 of the cylindrical surface portion 10 in the center region is set to 40 to 70% of the total length (roller axial length) L of the needle roller 1.
  • the crowning shape of the needle roller 1 is a logarithmic shape
  • the amount of drop is small at the beginning of crowning, and the drop amount increases markedly as it approaches the end. Therefore, if the straight portion (cylindrical surface portion) 10 is too short, that is, the crowning length is too long, the drop amount increases on the side closer to the end portion. For this reason, processing takes time and becomes expensive.
  • the straight portion (cylindrical surface portion) 10 is too long, that is, when the crowning length is too short, the drop amount becomes small. For this reason, when the bearing is inclined, an edge load is likely to occur.
  • the drop amount is a reduction amount in the radial direction caused by crowning.
  • the axial length L1 of the cylindrical surface portion 10 in the central region is set to 40 to 70% of the total length (roller axial length) L of the needle roller 1, even when the bearing inclination is small, the contact surface pressure is reduced. Is not excessive, and even when the inclination of the bearing is large, edge load is less likely to occur.
  • a welded cage is employed as the cage 2 in order to increase the load capacity (in order to increase the roller length and the number of rollers as much as possible).
  • the manufacturing process of the welded cage is roughly as follows.
  • a strip-shaped steel material obtained by shearing a cold-rolled steel plate such as SPC having good formability to a predetermined width with a slitter or the like is used as a material.
  • B) The strip-shaped steel material is pressed to form a basic cross-sectional shape (M-shaped or V-shaped) of the cage.
  • a pocket is punched and formed at a predetermined pitch in the length direction of the strip steel material.
  • the strip steel material is cut into a predetermined length in consideration of the welding allowance at both ends.
  • the strip steel material is bent into an annular shape.
  • Both ends are butt welded. Thereafter, heat treatment such as nitrocarburizing or carburizing and quenching is performed to remove strain generated by welding, and a hardened layer is formed on the surface of the cage.
  • the welded cage manufactured in this way uses a thin strip steel material to bend in an annular shape. For this reason, it is possible to make the width dimension of the punching remaining portion, which becomes a column part formed between adjacent pockets, relatively small, and to make the pocket length dimension corresponding to the roller length relatively large Is possible. Therefore, if a welded cage is used, the roller length can be increased and the number of rollers can be increased. Further, by making the cage 2 a welded cage, the pocket 5 is radially expanded from the inner diameter side toward the outer diameter side, and it is effective that the needle roller 1 contacts the connecting portion of the pocket 5. Can be prevented.
  • the outer diameter side roller stopper 6 and the inner diameter side roller stopper 7 are disposed so as not to overlap in the axial direction, and the boundary portion between the cylindrical surface portion 10 and the inclined surface portion 11 of the needle roller 1. 12 is arranged so as not to overlap with the outer diameter side roller stopper 6 and the inner diameter side roller stopper 7 at the axial position. For this reason, an oil film near the crowning start point (boundary portion 12 between the cylindrical surface portion 10 and the inclined surface portion 11) where the contact stress is maximum when the bearing is tilted can be secured, and the occurrence of wear or peeling at the crowning start point It can be suppressed and has a long life.
  • the crowning start point of the needle roller 1 (the boundary portion 12 between the cylindrical surface portion 10 and the inclined surface portion 11) was made not to contact the cage 2. By doing so, an oil film at the crowning start point can be secured, and the occurrence of wear or peeling at the crowning start point can be suppressed, resulting in a long life.
  • the roundness of the crowning portion (inclined surface portion 11) of the needle roller 1 may be set to 0.6 to 2.0 ⁇ m.
  • the contact surface pressure can be kept small even when there is an inclination of the shaft, etc., resulting in a longer life.
  • the outer diameter side retainer 6 is disposed on the outer diameter side of the roller pitch circle diameter PCD
  • the inner diameter side retainer 7 is disposed on the outer side of the pitch circle diameter PCD. It is arranged on the inner diameter side.
  • the outer diameter side retaining stopper 6 and the inner diameter side retaining stopper 7 are set so as not to overlap in the axial direction. That is, the outer diameter side retaining stopper 6 is offset to the outer side in the axial direction with respect to the inner diameter side retaining stopper 7.
  • the boundary portion 12 between the cylindrical surface portion 10 and the inclined surface portion 11 of the needle roller 1 is an outer diameter portion. This corresponds to the inclined portion 4c that connects 4a and the inner diameter portion 4b.
  • the boundary portion 12 of the needle roller 1 is in a state where it does not overlap the outer diameter side retaining stopper 6 and the inner diameter side retaining stopper 7 in the axial direction. That is, the boundary portion 12 is offset with respect to the outer diameter side retaining member 6 and the inner diameter side retaining member 7.
  • the inclined portion 4c that connects the outer diameter portion 4a and the inner diameter portion 4b constitutes a connection portion 8 that connects the outer diameter side retaining member 6 and the inner diameter side retaining member 7, and this connecting portion 8 is shown in FIG. It is set as the thin shape shown in FIG. In other words, the inclined portion 4c is provided with a notched portion (soaking portion) 9 having an unequal side triangle shape.
  • the boundary portion 12 between the cylindrical surface portion 10 and the inclined surface portion 11 of the needle roller is disposed between the outer diameter side roller stopper 6 and the inner diameter side roller stopper 7 of the cage 2, that is, at a position corresponding to the connection portion 8. Further, the boundary portion 12 is set so as not to contact the connecting portion 8.
  • the cage 2 of the needle roller 30 with the cage shown in FIG. 2 was called the M-type cage as described above, but as shown in FIG. 6, the cage 2 was called the V-type cage. It may be.
  • the M-type cage shown in FIG. 2 has an inward flange 3a at the outer end of the annular portion 3, whereas what is called a V-type cage as shown in FIG. It is something that does not have. For this reason, in this embodiment, the M-type cage shown in FIG. 2 or the V-type cage shown in FIG. 6 may be used.
  • the needle roller 30 with a retainer of the present embodiment can be used in a support structure for supporting a planetary gear mechanism S as shown in FIG.
  • the planetary gear mechanism S includes an internal gear (ring gear) 15, a sun gear (sun gear) 16 disposed at the center of the internal gear 15, and a plurality of planets meshing with the internal gear 15 and the sun gear 16.
  • a gear (pinion) 17 is provided.
  • the sun gear 16 is located at the center of the large internal gear 15, and a plurality of planetary gears 17 are interposed between the internal gear 15 and the sun gear 16.
  • Each planetary gear 17 is rotatably supported on a pinion shaft 18a of a carrier 18, as shown in FIG.
  • a needle roller 30 with a cage is disposed between the pinion shaft 18a and the planetary gear 17, and the needle roller 30 with the cage supports the planetary gear 17 on the pinion shaft 18a so as to be rotatable.
  • a support structure for supporting the planetary gear mechanism S can be configured.
  • the retainer 2 of the needle roller 30 with a retainer has an outer diameter surface of the pinion shaft 18a as an inner raceway surface and an inner diameter surface of the planetary gear 17 as an outer raceway surface.
  • the cage 2 constitutes an outer diameter guide surface 20 (see FIG. 1) that comes into contact with the outer raceway surface constituted by the inner diameter surface of the planetary gear 17 at both axial ends thereof.
  • the outer diameter guide surface 20 is a range H starting from the annular portion 3 and extending to a part of the column portion of the outer peripheral surface of the cage 2, as shown in FIG.
  • the retainer 2 is in guiding contact with the inner peripheral surface (inner diameter surface) of the pinion (planetary gear) 17 at the outer diameter guide surface 20.
  • this cage 2 is of a so-called outer ring guide type.
  • a raceway guide is preferable to a roller guide from the viewpoint of safety of cage motion under a high speed motion, and further, an outer ring than an inner ring guide from the viewpoint of lubricating oil behavior due to centrifugal force.
  • a guidance format is preferred.
  • An oil passage hole 18b for supplying lubricating oil is formed inside the pinion shaft 18a.
  • the oil passage hole 18b includes a first oil passage hole 18ba extending in the axial direction of the pinion shaft 18a, and a second oil passage hole 18bb extending from the first oil passage hole 18a in the radial direction of the pinion shaft 18a.
  • the second oil passage hole 18bb communicates the first oil passage hole 18ba and the outer peripheral surface of the pinion shaft 18a.
  • the second oil passage hole 18bb is provided at a position that overlaps the needle roller 30 with a cage in the axial direction.
  • Lubricating oil is drawn in through an oil passage hole 18b formed inside the pinion shaft 18a and guided to the outer peripheral surface of the pinion shaft 18a, whereby the needle roller 30 with a cage is lubricated.
  • the retainer 2 has the outer diameter side roller stopper 6 and the inner diameter side roller stopper 7, it is possible to effectively prevent the needle roller 1 from falling off. Further, the outer diameter of the boundary portion 12 between the cylindrical surface portion 10 and the inclined surface portion 11 of the roller 1 does not overlap with the roller stopper for preventing the roller 1 from dropping out of the cage 2 to the outer diameter in the axial direction. Since it arrange
  • the boundary part between the cylindrical surface part and the inclined surface part of the roller is arranged so as not to overlap the outer diameter side roller stopper and the inner diameter side roller stopper at the axial position, the contact stress becomes maximum when the bearing is inclined.
  • An oil film can be secured in the vicinity of the crowning start point (near the boundary portion between the cylindrical surface portion and the inclined surface portion), and the occurrence of wear and peeling at the crowning start point can be suppressed, thereby extending the life.
  • even if the crowning length is long it is not difficult to assemble when assembling to the shaft or the housing inner diameter.
  • the inner diameter side roller stopper 7 is not disposed on the inner diameter side of the outer diameter side roller stopper 6, and a space for the retainer 2 is provided, so that both the roller stoppers 6 and 7 (both inner diameter sides) are provided.
  • the axial position on the outer diameter side can reduce the inflow of lubricating oil.
  • the cage 2 is an outer ring guide type
  • the area of the contact guide portion between the outer diameter guide surface of the cage 2 and the inner peripheral surface of the pinion shaft 18 is large.
  • the oil permeability to the end of 1 and the oil permeability of the lubricating oil between the outer diameter guide surface of the cage 2 and the inner peripheral surface of the pinion shaft 18 are important.
  • the outer diameter guide surface and the boundary portion 12 between the cylindrical surface portion 10 and the inclined surface portion 11 of the needle roller 1 are arranged so as not to overlap at the axial position. Even with this setting, when the bearing is tilted, it is possible to secure an oil film in the vicinity of the crowning start point where the contact stress is maximum (near the boundary portion between the cylindrical surface part and the inclined surface part). Generation
  • production of peeling etc. can be suppressed and lifetime improvement can be aimed at.
  • the boundary portion 12 between the cylindrical portion 10 and the inclined portion 11 of the roller 1 is arranged so as to be on both ends in the axial direction with respect to the inner diameter side roller stopper portion 7, and the high edge surface pressure portion causes poor lubrication. It becomes difficult to become.
  • the axial position of the boundary portion 12 between the cylindrical portion 10 and the inclined portion 11 of the roller 1 is a connecting portion (inclined portion) 8 between the outer diameter side roller stopper 6 and the inner diameter side roller stopper 7 of the cage 2.
  • the portion 8 is configured not to contact the cage 2.
  • the roundness of the crowning portion (inclined surface portion) of the needle roller 1 may be set to 0.6 to 2.0 ⁇ m.
  • the contact surface pressure can be kept small even when there is an inclination of the shaft, etc., resulting in a longer life.
  • the high edge surface pressure portion is unlikely to be poorly lubricated, the occurrence of wear and peeling can be suppressed, and the deterioration of the inflow property of the lubricating oil can be effectively prevented.
  • the suitable needle roller 30 with a retainer excellent in durability can be provided. Moreover, even when the crowning length of the roller 1 is increased, the assembly is excellent when assembled to the shaft or the housing inner diameter.
  • the lubricating oil is guided between the outer diameter guide surface 20 and the inner peripheral surface of the planetary gear 17 through the thinning 9.
  • an oil film can be formed between the outer peripheral surface (outer diameter guide surface 20) of the cage 2 and the inner peripheral surface of the planetary gear 17, and the friction can be reduced. This contributes to the improvement of the service life.
  • the cage 2 is formed by rounding a steel plate from which a hole to be the pocket 5 is punched, and integrating the joined portions by welding. That is, the cage 2 is formed of a welded joint of steel plates from which the pockets 5 are punched. If formed in this way, the pockets 5 radially expand from the inner diameter side toward the outer diameter side, and it is possible to effectively prevent the rollers 1 from coming into contact with the connecting portions of the pockets 5 of the cage 2.
  • the needle roller 30 with the cage of the present embodiment may be used as a support bearing for the transmission T. That is, the needle roller 30 with a cage is a needle roller with a cage for automobiles.
  • This transmission T is provided with two planetary gear mechanisms S, S so that rotation is sequentially transmitted.
  • a planetary gear 26 is provided on the support shaft 25 via a needle roller 30 with a cage.
  • the outer diameter surface of the support shaft 25 is the inner raceway surface
  • the inner diameter surface of the planetary gear 26 is the outer raceway surface.
  • the cage 2 constitutes an outer diameter guide surface 20 (see FIG. 1) that contacts an outer raceway surface constituted by the inner diameter surface of the planetary gear 26 at both axial ends thereof.
  • the amount of lubricating oil is small because of the structure that enters the oil passage hole 27 of the support shaft (pinion shaft) 25 by splashing.
  • the needle roller with a cage used for the transmission it becomes a severe use environment such as an edge stress due to a centrifugal force or an uneven load. Therefore, it is optimal to use the needle roller 30 with a retainer according to the present embodiment for an automobile transmission.
  • the present embodiment has been described above, various modifications are possible without being limited to the above embodiment, and the shapes of the outer diameter side roller stopper 6 and the inner diameter side roller stopper 7 are not shown in FIG. However, it is only necessary that a part of the roller diameter is larger than the roller stoppers 6, 6, 7 and 7 adjacent in the circumferential direction. Further, the outer diameter side roller stopper 6 may be provided on the entire outer diameter portion 4 a of the column portion 4 or may be provided on a part of the outer diameter portion 4 a of the column portion 4. . Further, the inner diameter side roller stopper 7 may be provided on the entire inner diameter portion 4b of the column portion 4 or may be provided on a part of the inner diameter portion of the column portion.
  • the needle roller 30 with a cage may be a single row or a double row.
  • a crowning roller having a cylindrical surface portion having a constant diameter in the central region and inclined surface portions provided on both sides of the cylindrical surface portion may be used, which may be a single row or a double row.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rolling Contact Bearings (AREA)
PCT/JP2018/008151 2017-03-06 2018-03-02 保持器付き針状ころおよびそれを備えた遊星歯車機構支持構造 WO2018164014A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020197024721A KR102508641B1 (ko) 2017-03-06 2018-03-02 유지기가 부착된 바늘상 롤러 및 그것을 구비한 유성 기어 기구 지지 구조
CN201880015863.2A CN110382891B (zh) 2017-03-06 2018-03-02 带保持器的针状滚子和具有该带保持器的针状滚子的行星轮机构支承结构

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2017-041758 2017-03-06
JP2017041758A JP6804341B2 (ja) 2017-03-06 2017-03-06 保持器付き針状ころおよびそれを備えた遊星歯車機構支持構造
JP2017-164349 2017-08-29
JP2017164349A JP2019039550A (ja) 2017-08-29 2017-08-29 針状ころおよび保持器付き針状ころ

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CN112943796A (zh) * 2021-03-17 2021-06-11 中国航发哈尔滨轴承有限公司 一种马鞍形滚动体推力轴承

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JP2006052790A (ja) * 2004-08-11 2006-02-23 Ntn Corp ころ軸受
JP2009068677A (ja) * 2007-09-18 2009-04-02 Ntn Corp 保持器付き針状ころ用保持器および保持器付き針状ころ
JP2009079629A (ja) * 2007-09-25 2009-04-16 Jtekt Corp 針状ころ軸受用の保持器
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KR20190119052A (ko) 2019-10-21
CN110382891B (zh) 2021-05-25
CN110382891A (zh) 2019-10-25

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