Resin-made holder, roller with resin-made holder, and planetary gear support structure

Abstract

The column portion (31) of the resin holder (3) has a roller guide surface (40) that guides the rollers, an outer diameter side recessed portion (32) that is recessed in the circumferential direction from the outer diameter and extends to a position halfway to the inner diameter in the radial direction, and an inner diameter side recessed portion (35) that is recessed in the circumferential direction from the roller guide surface and continuously extends from the outer diameter side recessed portion to the inner diameter side. In a case where a distance between the outer diameter side recessed portions of the column portions facing each other across the pocket portion (50) is set as W1 and a distance between the inner diameter side recessed portions of the column portions facing each other across the pocket portion is set as W2, the pocket portion (50) being a portion divided between the circumferentially adjacent column portions, a relationship of W1 > W2 is established.

Description

Technical Field

[0001] This invention relates to a resin cage, a roller with a resin cage, and a planetary gear support structure. Background Technology

[0002] As a structure for ensuring the lubrication of the roller guide surfaces of the cage, there is a known patent document (Japanese Patent Application Publication No. 7-103320).

[0003] In the needle roller with a resin cage described in Patent Document 1, a slit is provided on the side of the post facing the pocket portion. This slit increases the amount of lubricating oil supplied to the cage, thereby improving the bearing's lifespan.

[0004] Prior art literature

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 7-103320 Summary of the Invention

[0007] Summary of the invention

[0008] The problem that the invention aims to solve

[0009] In the cage of Patent Document 1, the strength of the column may be reduced because a cut is formed in the column.

[0010] The present invention was made to solve the aforementioned problems, and its object is to provide a resin cage, a roller and planetary gear support structure with a resin cage that can improve the durability of the column.

[0011] Solution for solving the problem

[0012] One embodiment of the present invention provides a resin retainer comprising a pair of annular portions and a plurality of column portions extending axially and connecting the pair of annular portions. Each column portion includes: a roller guide surface for guiding rollers; an outer diameter side recess that is circumferentially recessed compared to the roller guide surface and extends from the outer diameter toward the inner diameter to a radially midpoint position; and an inner diameter side recess that is circumferentially recessed compared to the roller guide surface and extends continuously from the outer diameter side recess to the inner diameter side. When the distance between the outer diameter side recesses of the column portions facing each other across pocket portions is set as W1 and the distance between the inner diameter side recesses of the column portions facing each other across pocket portions is set as W2, the relationship W1>W2 holds, wherein the pocket portions are portions divided between adjacent column portions in the circumferential direction.

[0013] Preferably, in a cross-section perpendicular to the axis of the resin retainer, the outer diameter side recess extends parallel to the radial centerline of the pocket portion extending in the radial direction, and the inner diameter side recess extends parallel to the radial centerline of the column portion extending in the radial direction.

[0014] Preferably, in a cross-section perpendicular to the axis of the resin retainer, the outer diameter side recess extends parallel to the radial centerline of the pocket portion extending along the radial direction, and the inner diameter side recess tilts toward the pocket portion side as it moves toward the inner diameter side.

[0015] Preferably, the resin retainer further comprises: an outer diameter side roller anti-detachment portion that protrudes toward the pocket portion to restrict radially outward movement of the roller; and an inner diameter side roller anti-detachment portion that protrudes toward the pocket portion to restrict radially inward movement of the roller, wherein the junction of the outer diameter side recess and the inner diameter side recess overlaps with the radial position of the inner diameter side roller anti-detachment portion.

[0016] One aspect of the present invention provides a needle roller with a resin retainer, comprising the aforementioned resin retainer and a needle roller held in a pocket portion.

[0017] In one aspect of the present invention, a needle roller with a resin cage is disposed at the center of a planetary gear in a planetary gear support structure. The planetary gear support structure of this invention is a planetary gear support structure for a planetary gear mechanism, which includes an internal gear, a sun gear disposed at the center of the internal gear, a plurality of planetary gears meshing with the internal gear and the sun gear, and a gear carrier supporting the planetary gears. The planetary gears are rotatably supported on a pinion shaft disposed on the gear carrier via rolling bearings. In the planetary gear support structure, the rolling bearings are needle rollers with the aforementioned resin cages.

[0018] Invention Effects

[0019] According to the present invention, a resin cage, a roller with a resin cage, and a planetary gear support structure that can improve the durability of the column portion can be provided. Attached Figure Description

[0020] Figure 1 The diagram shows the state in which the roller with a resin cage of Embodiment 1 of the present invention is used in a planetary gear support structure. (A) is a simplified diagram of the planetary gear support structure, and (B) is a cross-sectional view of the planetary gear support shaft.

[0021] Figure 2 This is a perspective view showing the resin retainer according to Embodiment 1 of the present invention.

[0022] Figure 3 It is Figure 1A magnified perspective view of a portion of the resin retainer shown.

[0023] Figure 4 It means Figure 3 The diagram shows the column portion of the resin cage. (A) is a radial sectional view, and (B) is a top view.

[0024] Figure 5 From Figure 4 The cross-sectional view observed by arrow V in (A).

[0025] Figure 6 This is a diagram showing the resin retainer according to Embodiment 2 of the present invention, and is related to... Figure 5 The corresponding sectional view.

[0026] Figure 7 This is a perspective view showing a portion of a conventional resin retainer.

[0027] Figure 8 It means Figure 7 The diagram shows the pocket portion of the resin retainer. (A) is a radial sectional view, and (B) is a top view.

[0028] Figure 9 From Figure 8 Arrow IX in (A) shows the cross-sectional view. Detailed Implementation

[0029] The embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that identical or equivalent parts in the drawings are labeled with the same symbol and their descriptions are omitted.

[0030] (Overview of planetary gear support structure)

[0031] First, refer to Figure 1 (A) and Figure 1 Section (B) describes the outline of the planetary gear mechanism (planetary gear) 1 using the rollers 2 with resin cages of this embodiment.

[0032] Planetary gear mechanism 1, for example, is used in the transmission of a motor vehicle. In order to support the pinion (planetary gear) 13 in the planetary gear mechanism 1 so that it can rotate, a caged roller 2 is used. That is, the caged roller 2 in this embodiment is a caged roller for motor vehicles.

[0033] The planetary gear mechanism 1 includes: a gear ring (internal gear) 11 with internal teeth surrounding its outer periphery; a sun gear 12 with external teeth disposed at the center of the gear ring 11; and a plurality of pinions (planetary gears) 13 with external teeth disposed between the gear ring 11 and the sun gear 12. The pinions 13 mesh with the gear ring 11 and the sun gear 12, and are rotatably supported by rollers 2 with cages on pinion shafts 15 provided in engagement holes. Each pinion shaft 15 is disposed on (connected to) a gear carrier 14, and receives and outputs rotations corresponding to the revolution of the pinion 13 from the gear carrier 14.

[0034] Reference Figure 1 In (B), each pinion 13 is rotatably supported on the pinion shaft 15 by a caged roller 2 as described in this embodiment. That is, the caged roller 2 supports the pinion 13 and the pinion shaft 15 so that they can rotate, and the planetary gear mechanism 1 includes a pinion 13, a pinion shaft 15, and a caged roller 2. Specifically, the caged roller 2 is, for example, composed of multiple rollers 20 and a cage 3, with the outer peripheral surface of the pinion shaft 15 serving as the inner raceway surface and the inner peripheral surface of the pinion 13 serving as the outer raceway surface. The cage 3 in this embodiment is used for outer ring guidance. The roller 20 in this embodiment is a needle roller.

[0035] An oil passage 16 for supplying lubricating oil is formed inside the pinion shaft 15. Thus, lubricating oil is guided to the outer circumferential surface of the pinion shaft 15 through the oil passage 16, thereby lubricating the rollers 20. Specifically, the oil passage 16 includes: […]. Figure 1 The first oil passage 16a extends axially to the right of the paper surface; and the second oil passage 16b communicates with the outer peripheral surface near the axial center of the pinion shaft 15. Lubricating oil supplied from the oil passages 16a and 16b of the pinion shaft 15 passes through the gap between the column portion 31 and the roller 20 to lubricate the outer peripheral surface of the roller 20.

[0036] It should be noted that when a planetary gear mechanism 1 is used in the transmission of a multi-stage motor vehicle, in order to further improve the fuel efficiency of the vehicle, there are cases where the amount of lubricating oil supplied to the rollers 2 with cages is reduced or a low-viscosity lubricating oil is supplied. The kinematic viscosity of such lubricating oil used to improve the fuel efficiency of the vehicle is, for example, 2 centistokes (cSt) to 8 centistokes (cSt) at 100°C.

[0037] (Implementation Method 1)

[0038] Next, refer to Figures 2-5 This describes the retainer 3 in this embodiment.

[0039] The cage 3 has a pair of annular portions 30 and a plurality of column portions 31 extending axially and connecting the pair of annular portions 30 to each other. Rollers 20 are provided between adjacent column portions 31. Figure 1 The pocket portion 50 of (B) is divided between adjacent column portions 31 in the circumferential direction, and a plurality of such pocket portions 50 are provided at intervals in the circumferential direction. The column portion 31 is, for example, a straight type cage, with its axial central portion recessed above towards the inner diameter side. It should be noted that, in the following description, in the roller 2 with a cage, the direction along the axis (central axis) is referred to as "axial", the direction orthogonal to the axis is referred to as "radial", and the circumferential direction along the arc centered on the axis is referred to as "circumferential".

[0040] The cage 3 is made of resin. This allows for easy manufacturing of protrusions and recesses via injection molding. Any material can be used as the cage material, as long as it possesses sufficient mechanical strength. Reinforcing fibers can be incorporated to improve mechanical strength. Examples of suitable cage materials include polyetheretherketone (PEEK), polyphenylene sulfide (PPS), polyamide 6 (PA6) resin, polyamide 4-6 (PA46) resin, polyamide 6-6 (PA66) resin, and polyamide 9T (PA9T) resin. The resin cage 3 has a low specific gravity, reducing weight, and even in contact with the roller 20 with a small contact area, the contact surface pressure is not excessive, minimizing wear.

[0041] The column portions 31 extend approximately parallel to the axis along the axial direction and are arranged in a plurality of spaced intervals in the circumferential direction. Each column portion 31 is integrally joined at one end to one annular portion 30 and at the other end to another annular portion 30.

[0042] Reference Figure 3 , Figure 4 The column portion 31 has the following on the wall surface facing the pocket portion 50 (the surface facing the adjacent column portion 31): a roller guide surface 40 for guiding the roller 20; first and second outer diameter side recesses 32 and 33; first to third inner diameter side recesses 34, 35 and 36; outer diameter side roller anti-detachment portion 41; and inner diameter side roller anti-detachment portion 42.

[0043] The roller guide surface 40 is in contact with the rolling surface of the roller 20, guiding the roller 20 into a rolling state. For example... Figure 3 and Figure 4 As shown, a pair of roller guide surfaces 40 are provided axially, separated by the first outer diameter side recess 32. Figure 5 As shown, the roller guide surface 40 is the pocket wall surface that intersects the pitch circle PCD of the roller 20. The roller guide surface 40, which is opposite the pocket portion 50, is approximately parallel to the pocket centerline L1 of the pocket portion 50.

[0044] Outer diameter side roller anti-detachment portions 41 are respectively provided on the outer diameter side of the roller guide surface 40. The outer diameter side roller anti-detachment portions 41 protrude from the roller guide surface 40 towards the pocket portion 50. For example... Figure 5 As shown, the outer diameter side roller anti-detachment portions 41 are provided in pairs on both circumferential sides of the pocket portion 50. The spacing between the outer diameter side roller anti-detachment portions 41 facing each other across the pocket portion 50 is smaller than the diameter of the roller 20. Thus, the outer diameter side roller anti-detachment portions 41 restrict the roller 20 from moving radially outward. The outer diameter side roller anti-detachment portions 41 are so-called outer claws.

[0045] A pair of inner diameter-side roller anti-detachment portions 42 are provided on the inner diameter side of the roller guide surface 40. The inner diameter-side roller anti-detachment portions 42 protrude from the roller guide surface 40 toward the pocket portion 50. For example... Figure 3 and Figure 4 As shown, the inner diameter side roller anti-detachment part 42 is disposed between the roller guide surface 40 and the outer diameter side roller anti-detachment part 41. Figure 5 As shown, the inner diameter side roller anti-detachment portions 42 are provided in pairs on both circumferential sides of the pocket portion 50. The spacing between the inner diameter side roller anti-detachment portions 42 facing each other across the pocket portion 50 is smaller than the diameter of the roller 20. Therefore, the inner diameter side roller anti-detachment portions 42 restrict the roller 20 from moving radially inward. The inner diameter side roller anti-detachment portions 42 are so-called inner claws.

[0046] The first and second outer diameter side recesses 32 and 33 are more circumferentially recessed than the roller guide surface 40, extending from the outer diameter toward the inner diameter to the radial midpoint. For example... Figure 4 As shown in (B), the first and second outer diameter side recesses 32 and 33 preferably have approximately the same circumferential dimensions and approximately the same radial dimensions. The first outer diameter side recess 32 is located at the axial center of the column portion 31. Specifically, the first outer diameter side recess 32 is held axially by a pair of roller guide surfaces 40. A pair of second outer diameter side recesses 33 are provided, respectively disposed axially between the roller guide surface 40 and the inner wall of the adjacent annular portion 30. The first and second outer diameter side recesses 32 and 33 are flat planes.

[0047] The first to third inner diameter side recesses 34, 35, and 36 are circumferentially recessed from the roller guide surface 40, and continuously extend from the first and second outer diameter side recesses 32 and 33 to the inner diameter side. For example... Figure 4As shown in (B), the circumferential dimensions of the first to third inner diameter side recesses 34, 35, and 36 are preferably approximately the same, and their radial dimensions are also approximately the same. The first inner diameter side recess 34 is located at the axial center of the column portion 31. Specifically, the first inner diameter side recess 34 is held axially by a pair of inner diameter side roller anti-detachment portions 42. A pair of second inner diameter side recesses 35 are provided, respectively axially disposed between the inner diameter side roller anti-detachment portions 42 and the roller guide surface 40. A pair of third inner diameter side recesses 36 are provided, respectively axially disposed between the roller guide surface 40 and the inner wall of the adjacent annular portion 30. The first to third inner diameter side recesses 34, 35, and 36 are flat planes.

[0048] like Figure 3 As shown, the first outer diameter side recess 32 is continuous with the first inner diameter side recess 34 at the axial center of the column portion 31. Similarly, the first outer diameter side recess 32 is continuous with the second inner diameter side recess 35 between the roller guide surface 40 and the inner diameter side roller anti-detachment portion 42, and the second outer diameter side recess 33 is continuous with the third inner diameter side recess 36 at both axial ends. Their junction is preferably truncated at the inner diameter side roller anti-detachment portion 42 and the roller guide surface 40 and extends along a straight line in the axial direction.

[0049] like Figure 5 As shown, these interfaces, in a cross-sectional shape perpendicular to the axis, can be angled (edges) or rounded. Furthermore, these interfaces overlap radially with the inner diameter side roller anti-detachment portion 42. These interfaces are preferably located on the inner diameter side of the pitch circle PCD.

[0050] As described above, in the pinion shaft 15 ( Figure 1 The internal arrangement of (B) provides a second oil passage 16b for supplying lubricating oil to the inner diameter side of the cage 3. Therefore, by positioning the first inner diameter side recess 34 near the axial center, lubricating oil from the second oil passage 16b can be efficiently supplied to the outer diameter side. Thus, the first and second outer diameter side recesses 32 and 33, and the first to third inner diameter side recesses 34, 35 and 36 become oil guiding surfaces that guide lubricating oil from the inner diameter side to the outer diameter side or from the outer diameter side to the inner diameter side. Furthermore, the first and second outer diameter side recesses 32 and 33, and the first to third inner diameter side recesses 34, 35 and 36 also function as oil escaping portions that allow lubricating oil to escape.

[0051] Reference Figure 5In a cross-section perpendicular to the axis of the retainer 3, the first outer diameter side recess 32 extends parallel to the radial center line L2 of the pocket portion 50, which extends in the radial direction. Similarly, in the same cross-section, the second inner diameter side recess 35 extends parallel to the radial center line L2 of the column portion 31, which extends in the radial direction. The same applies to the relationship between the first outer diameter side recess 32 and the first inner diameter side recess 34, and between the second outer diameter side recess 33 and the third inner diameter side recess 36.

[0052] Referring to the figure, the distance between the first outer diameter side recesses 32 of the column portion 31 facing each other across the pocket portions 50 divided between adjacent column portions 31 in the circumferential direction is defined as W1, and the distance between the first inner diameter side recesses 35 of the column portion 31 facing each other across the pocket portions 50 is defined as W2. In this case, the relationship W1>W2 holds. It should be noted that W1 is the distance between the outer diameter side edge of the first outer diameter side recess 32, and W2 is the distance between the inner diameter side edge of the second inner diameter side recess 35. Moreover, focusing on a single column portion 31, the thickness of the first outer diameter side recess 32 is defined as D1, and the thickness of the first outer diameter side recess 32 is defined as D2. It should be noted that D1 is the thickness at the outer diameter side edge, and D2 is the thickness at the inner diameter side edge. In this embodiment, the thicknesses D1 and D2 are different, and the relationship D1>D2 holds.

[0053] To illustrate the effect of the retainer 3 in this embodiment, the structure of a conventional resin retainer 103 will be described. Structures identical to those in Embodiment 1 will be labeled with the same symbols as in Embodiment 1, and descriptions will be omitted.

[0054] (Regarding previous cages)

[0055] Reference Figures 7-9 The conventional retainer 103 differs from the structure of the wall portion of the pocket portion 50 constituting the column portion 131 in this embodiment 1. A central recess 132 is provided at the axial center of the column portion 131. The central recess 132 is located between the two pairs of roller guide surfaces 40 and the outer diameter side roller anti-detachment portion 41. An axially outer recess 133 is provided between each pair of roller guide surfaces 40 and the outer diameter side roller anti-detachment portion 41 and the annular portion 30. Figure 8 As shown in (B), these recesses 132, 133 are recessed in the circumferential direction with the same size in the column portion 131. Figure 9 As shown, these recesses 132, 133 are inclined at the same angle toward the central axis L2 of the column portion 131 as they move from the radially outward toward the inward.

[0056] Reference Figure 9Let W1 be the distance between the first outer diameter side recesses 132 of the column portion 131 facing each other across the pocket portions 50 divided between adjacent column portions 131 in the circumferential direction, and let W4 be the distance between the inner diameter side recesses 132 of the column portion 131 facing each other across the pocket portions 50. In this case, the relationship W1 = W4 holds. It should be noted that W1 is the distance between the outer diameter side end edges of the first outer diameter side recesses 132, and W4 is the distance between the inner diameter side end edges of the inner diameter side recesses 132. Furthermore, considering a single column portion 131, let D1 be the thickness of the central recess 132 at the outer diameter side end edge, and D4 be the thickness of the central recess 132 at the inner diameter side end edge. In the conventional retainer 103, the relationship D1 > D4 holds.

[0057] (Effects of Implementation Method 1)

[0058] As described above, in the conventional cage 103, W1 = W4, and the circumferential thickness of the central recess 132 of a column 131 is D1 > D4. As a result, the circumferential thickness of the central recess 132 of the column 131 decreases from the outer diameter side toward the inner diameter side, and in particular, there is a problem with the durability of the inner diameter side of the column 131.

[0059] In contrast, in this embodiment, W1 is set to W2, thus allowing the circumferential thickness D2 of the central recess 132 to be increased. Figure 5 The circumferential thickness D4 of the first inner diameter side recess 35 of the conventional resin retainer 103 is greater than that of the previous one. Figure 9 The diameter of the cage is larger (D2>D4). Therefore, compared with the conventional cage 103, the durability of the column 131 can be improved.

[0060] Furthermore, by providing recesses 32, 33, 34, 35, and 36, lubricating oil can be efficiently supplied to the roller anti-detachment parts 41 and 42, which have strict lubrication environments, thereby suppressing the wear of the roller anti-detachment parts 41 and 42 and the rollers. This can suppress the occurrence of peeling on the rollers 20 and achieve a long service life for the rollers 2 with cages.

[0061] Furthermore, according to this embodiment, since the recesses 32, 33, 34, 35, and 36 are provided, lubricating oil can be easily supplied and the life of the roller 2 with the cage can be extended. This is particularly effective in planetary gear support structures in the transmissions of motor vehicles where the lubrication environment of the bearings has become more demanding due to energy conservation efforts.

[0062] (Implementation Method 2)

[0063] Reference Figure 6The following describes the retainer 3A of Embodiment 2. The retainer 3A of Embodiment 2 has a structure that is substantially the same as that of the retainer 3 of Embodiment 1, but the main difference lies in the shape of the central portion of the column. Therefore, the same reference numerals are used to refer to the same structure as in Embodiment 1, and its description is omitted.

[0064] In a cross-section perpendicular to the axis of the retainer 3, the first outer diameter side recess 32 extends parallel to the radial center line L2 of the pocket portion 50 extending in the radial direction, while the second inner diameter side recess 35A does not extend parallel to the radial center line L2 of the pocket portion 50 extending in the radial direction, but rather tilts towards the pocket portion 50 towards the inner diameter side.

[0065] Referring to the figure, in this embodiment, the distance between the first outer diameter side recesses 32 of the column portion 31 facing each other across the pocket portions 50 divided between adjacent column portions 31 in the circumferential direction is set as W1, and the distance between the first inner diameter side recesses 35 of the column portion 31 facing each other across the pocket portions 50 is set as W3. In this case, the relationship W1>W3 holds. It should be noted that W1 is the distance between the outer diameter side edge of the first outer diameter side recess 32, and W2 is the distance between the inner diameter side edge of the second inner diameter side recess 35. Furthermore, considering a single column portion 31, the thickness of the first outer diameter side recess 32 is set as D1, and the thickness of the first inner diameter side recess 35A is set as D3. In this embodiment, the thickness D3 of the first inner diameter side recess 35A is greater than the thickness D2 of the first inner diameter side recess 35 in Embodiment 1.

[0066] In this embodiment, since W1 is set to be greater than W3, the circumferential thickness D3 of the first inner diameter side recess 35A can be increased. Figure 6 The circumferential thickness D4 of the central recess 132 on the inner diameter side of the conventional resin retainer 103 is greater than that of the conventional resin retainer 103. Figure 9 Furthermore, in this embodiment, the circumferential thickness D3 of the first inner diameter side recess 35A can be made greater than the thickness D2 of the first inner diameter side recess 35 in the first embodiment, thus improving durability compared to the cage 3 of the first embodiment.

[0067] It should be noted that in the above embodiment, the roller 20 housed in the pocket portion 50 uses a needle roller, but it is not limited to this. For example, a cylindrical roller, a rod roller, etc. can be used.

[0068] In addition, in the above embodiments, the cages 3 and 3A are straight cages with a pair of annular portions and the column portion 31 is not bent, but they are not limited to this. They can also be M-type cages with bent column portions 31, so-called V-type cages without a pair of annular portions 30, etc.

[0069] In addition, in the above embodiment, one pair of outer diameter side roller anti-detachment parts 41 is designed to sandwich a pair of inner diameter side roller anti-detachment parts 42, but the outer diameter side roller anti-detachment parts 41 and the inner diameter side roller anti-detachment parts 42 can also be arranged neatly in the radial direction, and their configuration relationship is not limited.

[0070] In embodiments 1 and 2, the first and second outer diameter side recesses 32 and 33, and the first to third inner diameter side recesses 34, 35, and 36, are not limited to flat planes; they can also be, for example, concave curved surfaces, convex curved surfaces, or surfaces composed of various other shapes. Furthermore, for ease of explanation, the first and second outer diameter side recesses 32 and 33, and the first to third inner diameter side recesses 34, 35, and 36 are described separately. However, depending on the shape of the roller anti-detachment parts 41 and 42, these recesses may be arranged axially connected, as long as at least one outer diameter side recess and one inner diameter side recess are provided. In this case, it is sufficient that the inclination angles of the outer diameter side recesses and the inner diameter side recesses relative to the centerline L2 of the column parts 3 and 3A are different.

[0071] It should be considered that the embodiments disclosed herein are illustrative in all respects and are not limiting. The scope of the invention is defined not by the foregoing description but by the claims, and includes all modifications within the meaning and scope equivalent to the claims.

[0072] Symbol explanation:

[0073] 1 Planetary gear mechanism, 2 Roller with cage, 3, 3A Cage, 11 Ring gear, 12 Sun gear, 13 Pinion, 14 Gear carrier, 15 Pinion shaft, 20 Roller, 30 Annular portion, 31 Column portion, 32 First outer diameter side recess, 33 Second outer diameter side recess, 33 Second outer diameter side recess, 34 First inner diameter side recess, 34 First inner diameter side recess, 35 Second inner diameter side recess, 36 Third inner diameter side recess, 40 Roller guide surface, 41 Outer diameter side roller anti-detachment portion, 42 Inner diameter side roller anti-detachment portion, 50 Pocket portion, 103 Cage, 103 Cage, 131 Column portion, 132 Central recess.

Claims

1. A resin retainer, wherein, The resin retainer has a pair of annular portions and a plurality of column portions extending axially and connecting the pair of annular portions. The column portion includes: a pair of roller guide surfaces that guide the rollers and are axially spaced apart; an outer diameter side recess that is circumferentially recessed compared to the roller guide surfaces and extends from the outer diameter toward the inner diameter to a radially midpoint; and an inner diameter side recess that is circumferentially recessed compared to the roller guide surfaces and extends continuously from the outer diameter side recess to the inner diameter side. The outer diameter side recess includes a first outer diameter side recess and a pair of second outer diameter side recesses. The first outer diameter side recess is located between a pair of roller guide surfaces, and the pair of second outer diameter side recesses are disposed between the roller guide surfaces and the annular portion. The inner diameter side recess includes a first inner diameter side recess and a pair of second inner diameter side recesses. The first inner diameter side recess is located between a pair of roller guide surfaces, and the pair of second inner diameter side recesses are disposed between the roller guide surfaces and the annular portion. When the distance between the first outer diameter side recess and the second outer diameter side recess of the column facing the column through the pocket portion is set to W1, and the distance between the first inner diameter side recess and the second inner diameter side recess of the column facing the column through the pocket portion is set to W2, the relationship W1>W2 holds true, wherein the pocket portion is the part divided between adjacent column portions along the circumferential direction.

2. The resin retainer according to claim 1, wherein, In a cross-section perpendicular to the axis of the resin cage, The outer diameter side recess extends parallel to the radial center line of the pocket portion, which extends in the radial direction. The inner diameter side recess extends parallel to the radial centerline of the column portion, which extends in the radial direction.

3. The resin retainer according to claim 1, wherein, In a cross-section perpendicular to the axis of the resin cage, The outer diameter side recess extends parallel to the radial center line of the pocket portion extending along the radial direction. The inner diameter side recess tilts toward the pocket side as it moves toward the inner diameter side.

4. The resin retainer according to claim 2 or 3, wherein, The resin retainer further comprises: an outer diameter side roller anti-detachment portion protruding towards the pocket portion to restrict radially outward movement of the roller; and an inner diameter side roller anti-detachment portion protruding towards the pocket portion to restrict radially inward movement of the roller. The junction between the outer diameter side recess and the inner diameter side recess overlaps with the radial position of the inner diameter side roller anti-detachment part.

5. A needle roller with a resin retainer, comprising: The resin retainer according to any one of claims 1 to 3; and The needle-shaped roller is held in the pocket portion.

6. A planetary gear support structure, which is a planetary gear support structure for a planetary gear mechanism, the planetary gear mechanism comprising an internal gear, a sun gear disposed at the center of the internal gear, a plurality of planetary gears meshing with the internal gear and the sun gear, and a gear carrier supporting the planetary gears, wherein the planetary gears are rotatably supported on a pinion shaft disposed on the gear carrier via rolling bearings, and in the planetary gear support structure, The rolling bearing is a needle roller with a resin cage as described in any one of claims 1 to 3.

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