WO2018164008A1 - 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
WO2018164008A1
WO2018164008A1 PCT/JP2018/008123 JP2018008123W WO2018164008A1 WO 2018164008 A1 WO2018164008 A1 WO 2018164008A1 JP 2018008123 W JP2018008123 W JP 2018008123W WO 2018164008 A1 WO2018164008 A1 WO 2018164008A1
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WO
WIPO (PCT)
Prior art keywords
cage
roller
needle roller
outer diameter
planetary gear
Prior art date
Application number
PCT/JP2018/008123
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
理之 冨加見
哲也 垂見
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 JP2017041756A external-priority patent/JP6932012B2/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 CN201880015813.4A priority Critical patent/CN110382887B/zh
Priority to KR1020197027768A priority patent/KR102546430B1/ko
Publication of WO2018164008A1 publication Critical patent/WO2018164008A1/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
    • 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 an inclined surface part can be adjusted so that the boundary site
  • the present invention provides a needle roller with a cage that suppresses the occurrence of wear and separation, and a planetary gear mechanism support structure including the same, in which a high edge surface pressure portion is unlikely to be poorly lubricated. Is.
  • 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. And an outer ring guide type cage in which the outer diameter guide surface is in contact with the outer ring raceway surface, and the needle roller has a constant diameter in a central region.
  • a crowning roller having a cylindrical surface portion and inclined surface portions on both sides of the cylindrical surface portion, and an outer diameter guide surface of the cage and a boundary portion between the cylindrical surface portion and the inclined surface portion of the needle roller in the axial direction. It arrange
  • the boundary portion between the cylindrical surface portion and the inclined surface portion of the needle roller overlaps with the outer ring raceway surface (contact surface with the housing inner diameter) serving as the cage guide surface in the axial direction.
  • the outer ring raceway surface contact surface with the housing inner diameter
  • it is arranged to be closer to the center side in the axial direction than the cage guide surface. For this reason, the high edge surface pressure portion is unlikely to be poorly lubricated.
  • the boundary portion between the cylindrical surface portion and the inclined surface portion of the needle roller is made not to contact the cage. For this reason, even when the mounted shaft or the housing is inclined, the boundary portion between the cylindrical surface portion and the inclined surface portion of the needle roller that generates the edge surface pressure is unlikely to be poorly lubricated.
  • 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. Guidance is preferred.
  • the cylindrical surface portion of the needle roller is in contact with the cage.
  • the outer diameter guide surfaces of the cage that are in contact with the outer ring raceway surface are formed at both ends in the axial direction. Thereby, the function as a bearing can be exhibited stably.
  • the cage includes an outer diameter side roller stopper provided at both ends in the axial direction on the outer diameter side from the roller pitch circle diameter, and an inner diameter side roller provided at the inner diameter side from the roller pitch circle diameter in the central part in the axial direction. It is preferable that the boundary portion between the cylindrical surface portion and the inclined surface portion of the needle roller is disposed at a position where the outer diameter side roller stopper and the inner diameter side roller stopper of the cage do not overlap in the axial direction. .
  • the retainer has the outer diameter side roller stopper and the inner diameter side roller stopper, so that the needle rollers 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.
  • 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 has a logarithmic crowning shape that is approximated by a logarithmic function, and the contouring line of the crowning in the axial cross-section indicates a generatrix of any of the inner ring raceway surface, the outer ring raceway surface, and the roller rolling surface. It is preferable that the length of the cylindrical surface portion is 40 to 70% of the total length of the roller. .
  • A 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 set in this way does not have an excessive contact surface pressure even when the inclination of the bearing is small, and an edge load hardly occurs even when the inclination of the bearing 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, and the occurrence of wear and peeling can be suppressed. For this reason, the suitable needle roller with a retainer excellent in durability can be provided.
  • 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 sectional drawing of the needle roller with a holder
  • FIG. 7 is an enlarged sectional view taken along line BB in FIG. 6. It is a principal part expanded sectional view of the 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 retainer 2 has an inward flange 3 a at the outer end of the annular portion 3.
  • PCD indicates the pitch circle diameter (pitch circle diameter) of the needle roller 1.
  • the recessed part 19 is provided in the center part of the outer peripheral surface of the column part 4, and the outer diameter guide surfaces 20 and 20 which become the bulging shape of an outer diameter side are formed in the axial direction both ends of the needle roller 1. Is provided.
  • the outer diameter guide surface 20 comes into contact with the outer ring raceway surface formed by the inner diameter surface of the planetary gear 17 (see FIG. 11).
  • 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 4 in the outer peripheral surface of the cage 2.
  • 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.
  • the needle roller 1 is a crowning roller having a cylindrical surface portion 10 having a constant diameter in a central region and inclined surface portions 11 (hereinafter also referred to as crowning portions) provided on both sides of the cylindrical surface portion 10. It is.
  • 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 invention 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 1 A is expressed by the following Equation 2, and a is the length from the origin on any of the inner raceway surface, outer 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.
  • each pocket 5 has four notches (soaking parts) 9. Therefore, as shown in FIGS. 1 to 3, when the needle roller 1 is fitted in the pocket 5, the boundary portion 12 between the cylindrical surface portion 10 and the inclined surface portion 11 is the cage 2 (the column portion 4). It is in a non-contact state where it does not touch.
  • boundary portion 12 between the cylindrical surface portion 10 and the inclined surface portion 11 is disposed on the inner side in the axial direction with respect to the outer diameter guide surface 20, whereby the outer diameter guide surface 20 of the cage 2 and the boundary portion 12 are arranged. They are arranged at different positions in the axial direction.
  • the cage guide is such that the boundary portion 12 between the cylindrical surface portion 10 and the inclined surface portion 11 of the needle roller 1 does not overlap the outer ring raceway surface (contact surface with the housing inner diameter) serving as the cage guide surface in the axial direction. It arrange
  • the high edge surface pressure portion is unlikely to be poorly lubricated, and the occurrence of wear and peeling can be suppressed. For this reason, the high-quality needle roller with a cage excellent in durability can be provided.
  • the outer ring guide type is used as the cage guide type, it is excellent in the safety of the cage motion under high speed motion, and is also preferable from the viewpoint of lubricating oil behavior due to centrifugal force.
  • the cylindrical surface portion 10 of the needle roller 1 is in contact with the cage 2 (inner diameter side roller stopper 7 thereof). If contact is made in this way, it is possible to effectively prevent the needle roller 1 from falling off and to stabilize the rotation of the needle roller 1. Further, the outer diameter guide surfaces 20 of the cage 2 that are in contact with the outer ring raceway surface are formed at both ends in the axial direction. For this reason, the needle roller 30 with a retainer shown in FIG. 1 can stably exhibit the function as a bearing.
  • the retainer 2 has a substantially M-shaped cross section, and thus has a cross sectional shape. Therefore, the retainer 2 shown in FIG. It is called a mold holder.
  • 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 retaining member (hereinafter also referred to as an outer diameter roller stopper) 6 is formed on the outer diameter portion 4a, and an inner diameter side retaining member (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 secured, the inner diameter side taper portion 6a and the outer diameter side taper portion 7a need not be provided.
  • 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 This corresponds to the inclined portion 4c that connects the outer diameter portion 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. That is, the inclined portion 4c is provided with a notched portion 9 having an unequal triangular 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 cage shown in FIG. 6 is called an M-type cage as described above, but is called a V-type cage as shown in FIG. It may be.
  • the M-type cage shown in FIG. 7 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. 6 or the V-type cage shown in FIG. 10 may be used.
  • the cage 2 has the outer diameter side roller stopper 6 and the inner diameter side roller stopper 7, the needle roller 1 can be effectively prevented 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 arranged on the inner diameter side of the outer diameter side roller stopper 6, and a space between the cage 2 and the needle roller 1 is provided. It is possible to reduce the deterioration of the inflow property of the lubricating oil due to the axial position on both (inner diameter side outer diameter side).
  • the cage 2 is of the outer ring guide type, as will be described later, the outer diameter guide surface of the cage 2 and the inner peripheral surface of the pinion shaft 18a (see FIGS.
  • the contact guide portion has a large area, the oil permeability to the end of the needle roller 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. It is. Therefore, it is effective to use the needle roller 30 with a cage.
  • 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 surface portion 10 and the inclined surface portion 11 of the needle roller 1 is arranged so as to be on both ends in the axial direction relative to the inner diameter side roller stopper portion 7, so that the high edge surface pressure portion is lubricated. It becomes difficult to become defective.
  • the axial position of the boundary portion 12 between the cylindrical surface portion 10 and the inclined surface portion 11 of the needle roller 1 is connected to the connecting portion (inclined portion) 8 between the outer diameter side roller stopper portion 6 and the inner diameter side roller stopper portion 7 of the cage 2.
  • the connecting portion 8 is configured not to contact the cage 2. As a result, 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, thereby extending the life.
  • 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, it is possible to suppress the occurrence of wear and peeling, and further the inflow of lubricating oil Can be effectively prevented.
  • the high-quality needle roller 30 with a retainer suitable for durability can be provided.
  • the assembly is excellent when assembled to the shaft or the housing inner diameter.
  • thinning portion 9 is provided in the cage 2, lubrication is provided between the outer diameter guide surface 20 and the outer ring raceway surface (for example, the inner peripheral surface of the planetary gear 17 (see FIG. 11) described later) through the thinning 9. Oil is led. Thereby, 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 has been 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 a cage of the present embodiment can be used for 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 outer diameter surface of the pinion shaft 18a is an inner raceway surface
  • the inner diameter surface of the planetary gear 17 is an outer ring raceway surface.
  • the cage 2 constitutes an outer diameter guide surface 20 (see FIG. 1) that comes into contact with the outer ring raceway surface formed by the inner diameter surface of the planetary gear 17 at both axial ends.
  • 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. For this reason, this retainer 2 becomes an 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 with the outer peripheral surface of the pinion shaft 18.
  • 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 needle roller 30 with a retainer 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 of this embodiment for an automobile transmission.
  • the shape of the notch 9 is a rectangular shape as shown in FIG. 3 or a shape as shown in FIG.
  • the boundary portion 12 between the cylindrical surface portion 10 and the inclined surface portion 11 of the needle roller 1 does not have to be in contact with the cage 2.
  • the shapes of the outer diameter side roller stopper 6 and the inner diameter side roller stopper 7 are not limited to those shown in FIG. 9, and the roller diameter> the dimension between the roller stoppers 6, 6, 7, 7 adjacent in the circumferential direction It is sufficient if there is a part of the range.
  • 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.
  • inner diameter side roller stopper 7 may be provided on the entire inner diameter portion 4 b of the column portion 4 or may be provided on a part of the inner diameter portion of the column portion 5.
  • 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.
PCT/JP2018/008123 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 WO2018164008A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201880015813.4A CN110382887B (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
KR1020197027768A KR102546430B1 (ko) 2017-03-06 2018-03-02 유지기 부착 침상 롤러 및 그것을 구비한 유성 기어 기구 지지 구조

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JP2017041756A JP6932012B2 (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
JP2017-041756 2017-03-06
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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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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JP2006052790A (ja) * 2004-08-11 2006-02-23 Ntn Corp ころ軸受
JP2009197904A (ja) * 2008-02-21 2009-09-03 Ntn Corp 転がり機械要素
WO2013191238A1 (ja) * 2012-06-21 2013-12-27 日本精工株式会社 転がり軸受及び工作機械用主軸装置
WO2014054376A1 (ja) * 2012-10-05 2014-04-10 Ntn株式会社 保持器付き針状ころ

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CN110382887B (zh) 2021-05-25
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