JP2002070872A - Thrust needle roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thrust needle roller bearing in which an increase of lubricating oil passing through per unit time is attained by improving at least one of either inflow or outflow characteristic of lubricating oil. SOLUTION: In the thrust needle roller bearing 1a, two pieces of retainers 10a, 20a have roller retaining parts 14a, 24a of which radial length 1a is set shorter than a roller length 1, and by folding at least one of two pieces of retaining parts 14a, 24a, at least one of thicknesses t12a, t13a in vertical direction at an outside part and an inside part radially of the roller retainer 14a, 24a is formed to be thinner than thickness t14a in vertical direction of roller retaining parts 14a, 24a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thrust needle roller bearing used for an automatic transmission for an automobile and the like.

[0002]

2. Description of the Related Art A conventional thrust needle roller bearing of this type is known, for example, as shown in FIG. The thrust needle roller bearing 100 includes a plurality of needle rollers 13.
0 and two annular cages 110 and 120 for holding the plurality of needle rollers 130 in a circle at a predetermined pitch.

Here, each of the two cages 110, 120 has a plurality of windows 111, 121 which are longer than the needle roller length 1 in the radial direction at the above-mentioned predetermined pitch. Reference numeral 120 denotes a plurality of needle rollers 13 which are roller holders 114 and 124 formed in the plurality of windows 111 and 121.
0 is held vertically. The thickness t in the vertical direction formed by the roller holding portions 114 and 124 when the two cages 110 and 120 sandwich the needle roller 130.
Is the diameter D of the needle roller 130 as shown in FIG.
Less than. The radial length of the roller holding portions 114 and 124 is substantially the same as the needle roller length l. And 2
The retainers 110 and 120 are arranged at the outermost end 11 in the radial direction.
2 and 122 are folded in the vertical direction overlapping each other, and the innermost ends 113 and 123 are bent in the vertical direction overlapping each other to form the front end 11 of the inner end 113.
3a is fixed by caulking.

[0004] The thrust needle roller bearing 100 having the above-described configuration is, as shown in FIG.
The inner surface of the innermost end 113 of the retainer 110 caulked so that the needle rollers 130 roll between the raceway surface 142 of the second shaft 144 and the raceway surface 145 of the second shaft 144 as a guide surface. 141 is fitted into the guide shaft portion 143. Then
When the engine of a car or the like is started and the first shaft 141 rotates, the retainers 110 and 120 also rotate together with the first shaft 141, and the needle rollers 130 move between the raceway surface 142 of the first shaft 141 and the raceway of the second shaft 144. Roll between surface 145. At this time, seizure occurs between the side surface of the needle roller 130 and the roller holding portions 114, 124 formed on the cages 110, 120, and the radial end face of the needle roller 130 and the cages 110, 1
20 are seized between the windows 111 and 121 in the radial direction and the side surfaces of the needle rollers 130 and the raceway surfaces 142 and 145.
In order to prevent seizure between the thrust needle roller bearing 100 and a hydraulic supply source (not shown), lubricating oil passes through an oil passage 146 formed between the first shaft 141 and the second shaft 144. Supplied.

The lubricating oil supply path will be described in detail with reference to FIG. 16. The lubricating oil passes through the oil path 146 as shown by the arrow A, and then contacts the raceway surface 145 of the second shaft 144 with the retainer 1.
It passes between the ten roller holders 114 and the radially inner portion as shown by the arrow B. Thereafter, the lubricating oil passes through the periphery of the needle roller 130 and the space formed by the retainers 110 and 120 as shown by an arrow C, and the side surface of the needle roller 130 and the rollers formed on the retainers 110 and 120. Holding part 114,
124, between the radial end faces of the needle rollers 130 and the radial end faces of the windows 111 and 121 of the retainers 110 and 120, and between the side faces of the needle rollers 130 and the raceway surfaces 142 and 145.
Between the raceway surface 145 of the second shaft 144 and the radially outer portion of the roller holding portion 114 of the cage 110, and between the raceway surface 142 of the first shaft 141 and the roller of the cage 120. It is discharged as shown by the arrow D through the space between the holding portion 124 and the radially outer portion.

[0006]

Here, the lubricating oil flow into the conventional thrust needle roller bearing 100 depends on the oil temperature, oil type, oil pressure, etc., as well as the raceway surface 145 of the second shaft 144. It is determined by the cross-sectional area of the space between the roller holding portion 114 of the holder 110 and the radially inner portion and the shape of the window 111. The outflow of the lubricating oil from the thrust needle roller bearing 100 depends on the oil temperature, oil type, oil pressure, etc.
44 and the roller holding portion 114 of the cage 110
The cross-sectional area of the space between the radially outer portion and the first
Track surface 142 of shaft 141 and roller holder 1 of cage 120
24, the cross-sectional area of the space between the radially outer portion and
And the shapes of the windows 111 and 121.

However, in the conventional thrust needle roller bearing 100, the raceway surface 145 of the second shaft 144
And the inner diameter portion of the cage 110 in the radial direction with respect to the roller holding portion 114 is narrow, and the sectional area of the space is small, so that the lubricating oil inflow is poor and the raceway surface of the second shaft 144 145 and the outer surface of the roller holder 114 of the cage 110 in the radial direction, and the raceway surface 142 of the first shaft 141.
And the outer portion of the retainer 120 in the radial direction with respect to the roller retaining portion 124 is narrow, and the cross-sectional area of the space is small, so that the lubricating oil outflow is poor.

Accordingly, the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to improve the inflow and outflow of lubricating oil by improving at least one of the lubricating oil amount per unit time that the lubricating oil passes. SUMMARY OF THE INVENTION It is an object of the present invention to provide a thrust needle roller bearing in which the size of the needle is increased.

[0009]

In order to solve the above-mentioned problems, a thrust needle roller bearing according to a first aspect of the present invention comprises a plurality of needle rollers and two annular cages. Each of the plurality of cages has a plurality of windows longer than the roller length in the radial direction, and the two cages vertically move the plurality of needle rollers by a roller holding portion formed in the plurality of windows. In the thrust needle roller bearing held between the two, the two cages make the radial length of the roller holding portion shorter than the roller length, and, among the two cages, By forming at least one of the rollers, the thickness of at least one of the radially outer portion and the inner portion in the vertical direction with respect to the roller holding portion is formed to be smaller than the vertical thickness of the roller holding portion. It is characterized by having.

In the thrust needle roller bearing according to a second aspect of the present invention, in the first aspect, the two cages are formed by bending at least one of the two cages. It is characterized in that the vertical thickness of both the outer portion and the inner portion in the radial direction with respect to the roller holding portion is made smaller than the vertical thickness of the roller holding portion by processing. I have.

Further, in the thrust needle roller bearing according to claim 3 of the present invention, in the invention according to claim 1 or 2, the two cages are radially innermost end and outermost end. It is characterized in that one of the parts is fixed by caulking. A thrust needle roller bearing according to a fourth aspect of the present invention is the thrust needle roller bearing according to the third aspect,
The other end of the crimped innermost end or outermost end of one of the two cages is bent at a substantially right angle.

[0012]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 shows a first embodiment of a thrust needle roller bearing according to the present invention, in which (A) is a partial plan view,
(B) is a sectional view taken along line 1B-1B of (A), (C)
FIG. 3B is a cross-sectional view along the line 1C-1C in FIG. FIG. 2 is a partial cross-sectional view showing a use state of the thrust needle roller bearing of FIG. However, in FIGS. 1B, 1C, and 2, the needle rollers are not sectioned.

In FIG. 1, a thrust needle roller bearing 1a
Are a plurality of needle rollers 30a and a plurality of needle rollers 30a.
a and two annular cages 10 for holding a circle at a predetermined pitch
a and 20a. Here, two cages 1
Each of 0a and 20a has a plurality of substantially rectangular windows 11a and 21a longer than the needle roller length 1 in the radial direction at the above-mentioned predetermined pitch, for example, punching and bending a cold rolled steel plate (SPCC) or the like. It is formed by doing. Roller holding portions 14a and 24a are formed on both side edges of the windows 11a and 21a so as to project toward each other. The roller holding portions 14a and 24a hold the needle rollers 30a in the up-down direction. Has become. Roller holder 14
The length la in the radial direction of a, 24a is shorter than the roller length l.
The upper cage 1 of the two cages 10a and 20a
The outer side of the roller holder 14a in the radial direction is a roller holder 1a.
It comprises a lower extension 15a bent downward at a right angle from the outer end of 4a, and an outer plate 12a bent radially outward from the lower end of the lower extension 15a. Further, the radially inner side of the roller holding portion 14a of the upper retainer 10a is bent inward from the inner end of the roller holding portion 14a and bent radially inward from the lower end of the inclined extending portion 16a. And the inner plate portion 13a. On the other hand, of the two cages 10a and 20a, the outer side in the radial direction of the roller holding portion 24a of the lower cage 20a has an upper extension 25a bent upward at a right angle from the outer end of the roller holding portion 24a. Outer plate portion 22 bent radially outward from the upper end of upper extension portion 25a
a. A radially inner side of the roller holder 24a of the lower retainer 20a has an inclined extension 26a bent from the inner end of the roller holder 24a and an inclined extension 2a.
6a and an inner plate 23a bent radially inward from the upper end of the inner plate 23a.

The two retainers 10a and 20a are
The outer plate portions 12a and 22a are vertically overlapped with each other, and the innermost end portions 17a and 17a of the inner plate portions 13a and 23a.
The inner plate portion 27a is fixed by bending the inner plate portion 27a in the vertical direction in which the inner plate portion 27a is folded and caulking the innermost end portion 17a of the inner plate portion 13a. Two retainers 10a, 20a
The fixed state, two cages 10a, 20a are formed around the holding portion 14a, in the vertical direction of the outer portion in the radial direction relative 24a thickness t _12a and the roller retaining portions 14a, 24a
The vertical thickness t _{13a of the} radially inner portion with respect to
Lower extension 15a, upper extension 25a, inclined extension 16
a, and since the sloping extension 26a is present, the roller holding portion 14a, than the vertical thickness t _14a of 24a thin. Further, the roller holding section 14a, vertical thickness t _14a of 24a is smaller than the diameter Da of the needle roller 30a.

As shown in FIG. 2, the thrust needle roller bearing 1a having the above-described structure is provided between the raceway surface 42 of the first shaft 41 and the raceway surface 45 of the second shaft 44, as shown in FIG.
The upper retainer 10a is loosely fitted on the guide shaft 43 of the first shaft 41 with the inner surface of the crimped innermost end 17a as a guide surface so that the roller a rolls. In this clearance fit, the outer plate portions 12a of the upper and lower retainers 10a, 20a,
Although it is possible to loosely fit the first shaft 41 with the leading edge surface of the outer plate portion 22a as a guide surface, these outer plate portions 12a, 2
2a are merely superposed, so these outer plate portions 1
Since there is a possibility that the upper and lower retainers 10a and 20a are opened from 2a and 22a and the retainers 10a and 20a are separated from the needle rollers 30a, the inner side surface of the crimped innermost end 17a of the upper retainer 10a is removed. It is preferable to fit loosely on the guide shaft 43 of the first shaft 41 as a guide surface.

When the engine such as an automobile is started and the first shaft 41 rotates, the retainers 10a and 20a also rotate together with the first shaft 41, and the needle rollers 30a move to the first shaft 41.
Between the raceway surface 42 of the second shaft 44 and the raceway surface 45 of the second shaft 44. At this time, the side surfaces of the needle rollers 30a and the retainers 10a,
Between the roller holders 14a and 24a formed in the roller 0a, the radial end face of the needle roller 30a and the retainer 10a.
a, 20a of the windows 11a, 21a with the radial end faces thereof, and the side surfaces of the needle rollers 30a and the raceway surfaces 42, 4
In order to prevent seizure between the thrust needle roller bearing 1a and the lubricating oil from an oil pressure source (not shown) through an oil passage 46 formed between the first shaft 41 and the second shaft 44, the thrust needle roller bearing 1a
Supplied to

The supply path of the lubricating oil will be described in detail with reference to FIG. 2. The lubricating oil passes through the oil path 46 as shown by the arrow A, and then the raceway surface 45 of the second shaft 44 and the upper retainer 10a.
It passes between the roller holding portion 14a and the radially inner portion as shown by the arrow B. Thereafter, the lubricating oil is supplied to the needle rollers 30
a, and through the space formed by the cages 10a and 20a as shown by the arrow C, the side surfaces of the needle rollers 30a and the roller holding portions 14a and 24 formed on the cages 10a and 20a.
a, the radial end face of the needle roller 30a and the retainer 10
a, 20a, between the radial end faces of the windows 11a, 21a, and between the side faces of the needle rollers 30a and the raceway surfaces 42, 45, so that the raceway surface 45 of the second shaft 44 and the roller of the retainer 10a are lubricated. As shown by an arrow D, it passes between the holding portion 14a and the radial outside portion and between the raceway surface 42 of the first shaft 41 and the roller holding portion 24a of the cage 20a and the radial outside portion. It is discharged to. When lubricating each part with the lubricating oil, the two retainers 10a and 20a
The vertical thickness t _{13a of the} radially inner portion of the roller holding portions 14a and 24a is the vertical thickness t of the roller holding portions 14a and 24a.
_Since it is thinner than 14a, the sectional area of the space between the raceway surface 45 of the second shaft 44 and the radially inner portion with respect to the roller holding portion 14a of the upper cage 10a is larger than that of the conventional example shown in FIG. Thus, the lubricating oil inflow is improved. The roller holders 14a, 24 are formed by two cages 10a, 20a.
vertical thickness t _12a Mokoro holding portion 14a of the outer portion in the radial direction with respect to a, since thinner than the vertical thickness t _14a of 24a, the retainer 10a and the raceway surface 45 of the second shaft 44 The cross-sectional area of the space between the roller holding portion 14a and the radially outer portion and the raceway surface 42 of the first shaft 41 and the cage 20a
The cross-sectional area of the space between the roller holding portion 24a and the radially outer portion is also increased, and the outflow of lubricating oil is also improved. Therefore, the amount of lubricating oil per unit time passing through the thrust needle roller bearing 1a is significantly increased, and it is possible to reliably prevent seizing of each part of the bearing. Further, since the passage of the lubricating oil is less likely to be blocked by the retainers 10a and 20a, the lubricating oil is less likely to stagnate, and an increase in the oil temperature can be suppressed.

The upper and lower retainers 10a, 20a
As shown in FIG. 3, opposite to the one shown in FIG. 1, the inner plates 13a and 23a are vertically overlapped with each other and the outermost ends 18a and 2a of the outer plates 12a and 22a.
8a may be bent in the vertical direction so as to fold over each other, and the outermost end portion 18a of the outer plate portion 12a may be fixed by caulking. Even in this case, of course, the two cages 1
0a, 20a forms roller retaining portion 14a, the vertical thickness t _13a in the vertical direction of the thickness t _12a and the roller retaining portions 14a, the radially inner portion relative to 24a of the outer portion in the radial direction relative 24a Are the lower extension 15a and the upper extension 25
a, sloping extension 16a, and since the sloping extension 26a is present, roller retaining portions 14a, thinner than the vertical thickness t _14a of 24a. Further, the roller holding portions 14a, 24a
In the vertical direction of the thickness t _14a is smaller than the diameter Da of the needle roller 30a.

Next, a second embodiment of the thrust needle roller bearing according to the present invention will be described with reference to FIG. FIG. 4 shows a second embodiment of a thrust needle roller bearing according to the present invention, wherein (A) is a partial plan view and (B) is 4B-4B of (A).
It is sectional drawing along the line. However, the needle rollers are not cross-sectioned in FIG. The thrust needle roller bearing 1b shown in FIG. 4 has substantially the same configuration as the thrust needle roller bearing 1a shown in FIG. 1, but has the other end of the crimped innermost end 17b of the lower retainer 20b. The only difference is that a certain outermost end 28b is bent at a substantially right angle.

That is, the thrust needle roller bearing 1b comprises a plurality of needle rollers 30b and two annular cages 10b, 20 for holding the plurality of needle rollers 30b in a circle at a predetermined pitch.
b. Here, two cages 10b, 2
0b has a plurality of substantially rectangular windows 11b and 21b at the above-mentioned predetermined pitch which are longer than the needle roller length 1 in the radial direction, and punches and bends a cold rolled steel plate (SPCC) or the like, for example. Formed by Each window 11
Roller holding portions 14b and 24b are formed on both side edges of the b and 21b so as to project toward each other, and the needle rollers 30b are vertically held by these roller holding portions 14b and 24b. I have. Roller holding parts 14b, 2
The radial length lb of 4b is shorter than the roller length l. Also,
A radially outer side of the roller holder 14b of the upper holder 10b of the two holders 10b, 20b is a lower extension 15b bent at a right angle from an outer end of the roller holder 14b.
And an outer plate portion 12b bent radially outward from the lower end of the downwardly extending portion 15b. Further, a radially inner side of the roller holding portion 14b of the upper retainer 10b is bent inward from the inner end of the roller holding portion 14b and a radially inner side from a lower end of the inclined extending portion 16b. And the inner plate portion 13b. On the other hand, of the two cages 10b, 20b, the outer side in the radial direction of the roller holder 24b of the lower cage 20b is provided with an upper extending portion 25b bent at a right angle from the outer end of the roller holder 24b, The outer plate 22b is bent outward from the upper end of the extension 25b in the radial direction. Further, a radially inner side of the roller holding portion 24b of the lower retainer 20b is formed with an inclined extending portion 26b bent from an inner end of the roller holding portion 24b, and radially inward from an upper end of the inclined extending portion 26b. And a bent inner plate portion 23b.

The two retainers 10b and 20b are
The outer plate portions 12b and 22b are vertically overlapped with each other, and the outermost end portion 28b of the lower retainer 20b is bent upward at a right angle, and the inner plate portions 13b and 23b are further bent.
The innermost end portions 17b and 27b of the inner plate portion 13b are bent in the vertical direction so as to be overlapped with each other, and the innermost end portion 17b of the inner plate portion 13b is fixed by caulking. In a state where the two cages 10b and 20b are fixed, the thickness t _{12b of the} radially outer portion in the vertical direction with respect to the roller holders 14b and 24b formed by the two cages 10b and 20b and the roller holder The thickness t _13b in the vertical direction of the radially inner portion with respect to 14b and 24b is _smaller than the lower extension 15b and the upper extension 25.
b, thin sloping extension 16b, and since the inclined extending portion 26b are present, roller retaining portions 14b, than the vertical thickness t _14b of 24b. Further, the roller holding portions 14b, 24b
In the vertical direction of the thickness t _14b is smaller than the diameter Db of the needle rollers 30b.

The thrust needle roller bearing 1b having the above-described structure is used for the raceway surface 4 of the first shaft 41 shown in FIG.
The inner surface of the crimped innermost end 17b of the upper retainer 10b is used as a guide surface so that the needle roller 30b rolls between the raceway surface 2 of the second shaft 44 and the raceway surface 45 of the second shaft 44. The guide shaft 43 is loosely fitted. In this loose fit, the outer surface of the outermost end 28b of the lower retainer 10b can be loosely fitted on the first shaft 41 without any problem as a guide surface. Therefore, as compared with the thrust needle roller bearing 1a shown in FIG. 1, the usable range of the bearing can be expanded.

The upper and lower retainers 10b, 20b
As shown in FIG. 5, opposite to the one shown in FIG. 4, the inner plates 13b and 23b are vertically overlapped with each other, and the innermost end 27b of the lower retainer 20b is bent at a right angle. Further, the outermost ends 18b and 28b of the outer plates 12b and 22b may be bent in the vertical direction so as to fold over each other, and the outermost ends 18b of the outer plates 12b may be fixed by caulking. Even in this case, of course, the two cages 10b, 20b are formed by the roller holders 14b, 24.
The thickness t _12b in the vertical direction of the outer portion in the radial direction with respect to _b, and the thickness t _13b in the vertical direction of the inner portion in the radial direction with respect to the roller holding portions 14b and 24b are lower extension portions 15b and upper extension portions. Projecting portion 25b, inclined extending portion 16b, and inclined extending portion 26b
Is smaller than the vertical thickness t _{14b of} the roller holding portions 14b and 24b. In addition, the roller holding unit 14
The thickness t _14b of the b and 24b in the up-down direction is the same as that of the needle roller 30b
Is smaller than the diameter Db.

Next, a third embodiment of the thrust needle roller bearing according to the present invention will be described with reference to FIG. 6A and 6B show a third embodiment of a thrust needle roller bearing according to the present invention, wherein FIG. 6A is a partial plan view, and FIG. 6B is 6B-6B of FIG.
It is sectional drawing along the line. However, in FIG. 6B, the needle rollers are not sectioned. Thrust needle roller bearings 1c shown in FIG. 6, two cages 10c, 20c are formed roller retaining portion 14c, the vertical thickness t _13c only roller retaining portion 14c of the inner portion in the radial direction relative to 24c , 24c is smaller than the vertical thickness t _{14c of} the roller holding portions 14c, 24c.
vertical thickness t _12c Gakoro holding portion 14c of the outer portion in the radial direction relative to the c, different from the thrust needle roller bearing 1a shown in FIG. 1 in that it is the same as the vertical thickness t _14c of 24c ing.

That is, the thrust needle roller bearing 1c comprises a plurality of needle rollers 30c and two annular cages 10c, 20 which hold the plurality of needle rollers 30c in a circle at a predetermined pitch.
c. Here, two cages 10c, 2
Each of 0c has a plurality of substantially rectangular windows 11c, 21c longer than the needle roller length 1 in the radial direction at the above-mentioned predetermined pitch, for example, punching and bending a cold-rolled steel plate (SPCC) or the like. Formed by Each window 11
Roller holding portions 14c and 24c are formed on both side edges of the c and 21c so as to project toward each other, and the needle rollers 30c are vertically held by the roller holding portions 14c and 24c. I have. Roller holding parts 14c, 2
The radial length lc of 4c is shorter than the roller length l. Also,
An outer plate portion 12c extending radially outward from an outer end of the roller holding portion 14c is provided on a radially outer side of the roller holding portion 14c of the upper holder 10c among the two cages 10c and 20c. Further, a radially inner side of the roller holding portion 14c of the upper retainer 10c is bent inward from an inner end of the roller holding portion 14c and a radially inner side from a lower end of the inclined extending portion 15c. And the inner plate portion 13c provided. On the other hand, an outer plate portion 22c extending radially outward from an outer end of the roller holding portion 24a is provided on a radially outer side of the roller holding portion 24c of the lower cage 20c among the two cages 10c and 20c. . Also, the lower retainer 20
The inside of the roller holder 24c in the radial direction is the roller holder 24.
c, an inclined extension portion 25c bent from the inner end, and an inner plate portion 23c bent radially inward from the upper end of the inclined extension portion 25c.

The two retainers 10a and 20a
The outermost end portions 16c and 26c of the outer plate portions 12c and 22c are bent in the up and down direction to fold each other, and the innermost end portions 17c and 27c of the inner plate portions 13c and 23c are bent in the up and down direction to overlap each other. The innermost end 27c of 23c is fixed by caulking. When the two retainers 10a and 20a are fixed, the roller retainer 14 is formed by the two retainers 10c and 20c.
The thickness t _13c in the vertical direction of the radially inner portion with respect to c and 24c is equal to the thickness t _14c in the vertical direction of the roller holding portions 14c and 24c because of the presence of the inclined extension portions 15c and 25c.
Thinner than. On the other hand, the vertical thickness t _{12c of the} radially outer portion with respect to the roller holding portions 14c, 24c is the same as the vertical thickness t _14c of the roller holding portions 14c, 24c. Also, roller retaining portion 14c, the vertical thickness t _14c of the 24c is smaller than the diameter Dc of the needle rollers 30c.

The thrust needle roller bearing 1c having the above-described structure is provided on the raceway surface 42 of the first shaft 41 shown in FIG.
The inner surface of the crimped innermost end 27c of the lower retainer 20c is used as a guide surface so that the needle rollers 30c roll between the and the raceway surface 45 of the second shaft 44. The guide shaft 43 is loosely fitted. In this loose fit, the outer surface of the outermost end 26c of the lower retainer 20c can be loosely fitted on the first shaft 41 as a guide surface.

In the present embodiment, when lubricating each part of the bearing with the lubricating oil, the thickness in the vertical direction of the radially inner portion with respect to the roller holding parts 14c, 24c formed by the two cages 10c, 20c. t _13c Gakoro holding portion 14c, so thinner than the vertical thickness t _14c of 24c, an inner portion of the radial direction with respect to roller retaining portion 24c of the raceway surface 45 and the lower retainer 20c of the second shaft 44 The cross-sectional area of the space between them is larger than that of the conventional example shown in FIG. 16, and the inflow of lubricating oil is improved. Therefore, the amount of lubricating oil per unit time passing through the thrust needle roller bearing 1c is slightly increased, and the anti-seizure property of each part of the bearing can be improved. In addition, the cage 10
Since the passage of the lubricating oil is less likely to be blocked by c and 20c, the lubricating oil is less likely to stagnate and the rise in oil temperature can be suppressed.

The upper and lower retainers 10c, 20c
As shown in FIG. 7, opposite to the one shown in FIG. 6, the innermost ends 17c and 27c of the inner plates 13c and 23c are bent in the vertical direction so as to be folded together, and the outer plate 1
The outermost end portions 16c and 26c of the outer plate portions 2c and 22c are bent in the vertical direction so as to be overlapped with each other to form the outermost end portions 2c and 22c of the outer plate portion 22c.
6c may be fixed by swaging. Even in this case, the thickness _t13c in the vertical direction of the radially inner portion with respect to the roller holding portions 14c and 24c formed by the two retainers 10c and 20c is, of course, the inclined extension portions 15c and 25c. since but present, roller retaining portion 14c, thinner than the vertical thickness t _14c of 24c. On the other hand, the roller holding portions 14c,
24c, the thickness t in the vertical direction of the radially outer portion
_12c is the thickness t of the roller holders 14c and 24c in the vertical direction.
Same as _14c . Also, roller retaining portion 14c, the vertical thickness t _14c of the 24c is smaller than the diameter Dc of the needle rollers 30c.

Next, a fourth embodiment of the thrust needle roller bearing according to the present invention will be described with reference to FIG. 8A and 8B show a thrust needle roller bearing according to a fourth embodiment of the present invention, wherein FIG. 8A is a partial plan view, and FIG. 8B is 8B-8B of FIG.
It is sectional drawing along the line. However, the needle rollers are not cross-sectioned in FIG. Thrust needle roller bearing 1d shown in FIG. 8, two cages 10d, 20d are formed around the holding section 14d, only the vertical thickness t _12d of the outer diameter portion in the radial direction relative to 24d are roller retaining portion 14d, thinner than the vertical thickness t _14d of 24d, roller retaining portion 14d, 24
different from the vertical direction of the thickness t _13d Gakoro holding portion 14d, the thrust needle roller bearing 1a shown in FIG. 1 and is in that same vertical thickness t _14d of 24d inside diameter portion in a radial direction relative to d ing.

That is, the thrust needle roller bearing 1d comprises a plurality of needle rollers 30d and two annular retainers 10d, 20 which hold the plurality of needle rollers 30d in a circular shape at a predetermined pitch.
d. Here, two cages 10d, 2
Each of 0d has a plurality of substantially rectangular windows 11d and 21d longer than the needle roller length 1 in the radial direction at the above-mentioned predetermined pitch, for example, punching and bending a cold-rolled steel plate (SPCC) or the like. Formed by Each window 11
Roller holding portions 14d and 24d are formed on both side edges of the d and 21d so as to protrude toward each other, and these needle holding portions 14d and 24d hold the needle rollers 30d in the vertical direction. I have. Roller holding parts 14d, 2
The radial length ld of 4d is shorter than the roller length l. Also,
Of the two cages 10d, 20d, the outer side in the radial direction of the roller holder 14d of the upper cage 10d is an inclined extension 15d bent from the outer end of the roller holder 14d, and the lower end of the inclined extension 15d. And an outer plate portion 12d bent radially outward from the outer side. An inner plate portion 13d extending radially inward from the inner end of the roller holding portion 14d is provided radially inside the roller holding portion 14d of the upper holder 10d. On the other hand, among the two cages 10d and 20d, the radially outer side of the roller holding portion 24d of the lower cage 20d has an inclined extending portion 25d bent from the outer end of the roller holding portion 24d, and an inclined extending portion. The outer plate 22d is bent radially outward from the upper end of the outer plate 25d. An inner plate portion 23d extending radially inward from an inner end of the roller holding portion 24d is provided radially inside the roller holding portion 24d of the lower retainer 20d.

The two retainers 10d and 20d are
The outermost ends 16d and 26d of the outer plates 12d and 22d are bent in the up-down direction to fold each other, and the innermost ends 17d and 27d of the inner plates 13d and 23d are bent in the up-and-down direction to overlap each other. The innermost end 27d of 23d is fixed by caulking. When the two retainers 10d and 20d are fixed, the roller retainer 14 is formed by the two retainers 10d and 20d.
The thickness t _12d in the vertical direction of the radially outer portion of the roller holding portions 14d and 24d is smaller than the thickness t _14d in the vertical direction of the roller holding portions 14d and 24d due to the presence of the inclined extension portions 15d and 25d.
Thinner than. On the other hand, the vertical thickness t _13d of the inner portion in the radial direction relative to the roller retaining portions 14d, 24d are roller retaining portion 14d, is the same as the vertical thickness t _14d of 24d. Further, the roller holding portion 14d, the vertical direction of the thickness t _14d of 24d is smaller than the diameter Dd of the needle rollers 30d.

The thrust needle roller bearing 1d having the above-described structure is provided on the raceway surface 42 of the first shaft 41 shown in FIG.
The inner surface of the crimped innermost end 27d of the lower retainer 20d is used as a guide surface so that the needle rollers 30d roll between the and the raceway surface 45 of the second shaft 44. The guide shaft 43 is loosely fitted. In this clearance fit, the outer surface of the outermost end 26d of the lower retainer 20d can be loosely fitted to the first shaft 41 as a guide surface.

In this embodiment, when lubricating each part of the bearing with the lubricating oil, the thickness of the radially outer portion in the vertical direction with respect to the roller holding portions 14d and 24d formed by the two cages 10d and 20d. t _12d Gakoro holding portion 14d, since thinner than the vertical thickness t _14d of 24d, and an outer portion in a radial direction relative to the roller holding portion 24d of the raceway surface 45 and the lower retainer 20d of the second shaft 44 The cross-sectional area of the space between them is larger than that of the conventional example shown in FIG. 16, and the outflow of lubricating oil is improved. Therefore, the amount of lubricating oil per unit time passing through the thrust needle roller bearing 1d is slightly increased, and seizure resistance of each part of the bearing can be improved. In addition, the cage 10
Since the passage of the lubricating oil is less likely to be interrupted by d and 20d, the lubricating oil is less likely to stay and the rise in oil temperature can be suppressed.

The upper and lower retainers 10d, 20d
As shown in FIG. 9, opposite to the one shown in FIG. 8, the innermost ends 17d and 27d of the inner plates 13d and 23d are bent in the vertical direction so as to be folded together, and the outer plate 1
The outermost end portions 16d and 26d of the outer plate portions 2d and 22d are bent in the vertical direction so as to fold over each other, thereby forming the outermost end portions 2d of the outer plate portion 22d.
6d may be fixed by caulking. Even in this case, the thickness t _{12d of the} radially outer portion in the vertical direction with respect to the roller holding portions 14d and 24d formed by the two cages 10d and 20d is, of course, the inclined extension portions 15d and 25d. Is smaller than the thickness t _{14d of} the roller holding portions 14d and 24d in the vertical direction. On the other hand, the roller holding portions 14d,
Vertical thickness t of the radially inner portion with respect to 24d
_13d is the thickness t of the roller holders 14d and 24d in the vertical direction.
Same as _14d . Further, the roller holding portion 14d, the vertical direction of the thickness t _14d of 24d is smaller than the diameter Dd of the needle rollers 30d.

Next, a thrust needle roller bearing according to a fifth embodiment of the present invention will be described with reference to FIG. FIG.
FIG. 9 is a partial sectional view of a thrust needle roller bearing according to a fifth embodiment of the present invention. However, the needle rollers are not sectioned in FIG. Thrust needle roller bearing 1 shown in FIG.
e is a radially outer portion of the roller holders 14e, 24e formed by bending only the upper cage 10e of the two cages 10e, 20e. The thickness t _13e in the vertical direction of the roller holding portions 14e, 24e is made smaller than the thickness t _14e in the vertical direction of the inner portion in the radial direction with respect to the vertical thickness t _12e of the roller holding portions 14e, 24e. This is different from the thrust needle roller bearing 1a shown in FIG.

That is, the thrust needle roller bearing 1e comprises a plurality of needle rollers 30e and two annular retainers 10e, 20 which hold the plurality of needle rollers 30e in a circle at a predetermined pitch.
e. Here, two cages 10e, 2
Each of 0e has a plurality of substantially rectangular windows 11e, 21e at the above-mentioned predetermined pitch which are longer than the needle roller length in the radial direction, and is formed by punching and bending a cold-rolled steel plate (SPCC) or the like. It is formed. Each window 11e,
Holders 14e and 24e are formed on both side edges of 21e, and needle rollers 30e are formed by these roller holders 14e and 24e.
Are held vertically. Also,
Of the two cages 10e, 20e, the radially outer side of the roller holder 14e of the upper cage 10e is a lower extension 16e bent at a right angle from the outer end of the roller holder 14e.
And an outer plate portion 12e bent radially outward from the lower end of the downward extension portion 14e. Further, a radially inner side of the roller holding portion 14e of the upper retainer 10e is bent radially inward from a lower end of the inclined extending portion 15e bent from an inner end of the roller holding portion 14e. The inner plate 13e extends. On the other hand, of the two cages 10e, 20e, the outer side in the radial direction of the roller holder 24e of the lower cage 20e extends outward from the outer end of the roller holder 24e without being bent. The inner side in the radial direction is provided with an inner plate portion 23e extending radially inward from the inner end of the roller holding portion 24e.

Then, the two retainers 10e, 20e
When the outer plate portions 12e and 22e are vertically overlapped with each other,
The innermost end portions 17e, 25e of the inner plate portions 13e, 23e
Are bent in the vertical direction so as to fold over each other to form the inner plate portion 13.
fixed by caulking the innermost end 17e of e
It has become. Fix two retainers 10e and 20e
When the two retainers 10e and 20e are
Up and down of the radially outer portion with respect to the holding portions 14e and 24e
Thickness t_12eIndicates that the downward extension 16e is present
The thickness t of the roller holding portions 14e and 24e in the vertical direction.
_14eThinner than. On the other hand, the roller holding portions 14e and 24e
And the vertical thickness t of the radially inner portion_{13 e}Well, inclined
Since the extension 15e exists, the roller holding portions 14e, 2
4e vertical thickness t_14eThinner. Also, roller holding
The vertical thickness t of the portions 14e and 24e _14eIs a needle roller
It is smaller than the diameter De of 30e.

The thrust needle roller bearing 1e having the above-described structure is provided on the raceway surface 42 of the first shaft 41 shown in FIG.
The guide of the first shaft 41 with the inner side surface of the innermost end portion 17e of the upper retainer 10e caulked so that the needle roller 30e rolls between the upper roller 10e and the raceway surface 45 of the second shaft 44. The shaft 43 is loosely fitted. In the present embodiment, the two retainers 10e,
The thickness t _13e of the inner portion in the radial direction in the vertical direction with respect to the roller holding portions 14e and 24e is formed by the roller holding portion 14e.
e, since thinner than the vertical thickness t _14e of 24e, the cross-sectional area of the space between the roller retaining portions radially inner portion relative to 24e of the raceway surface 45 and the upper retainer 20e of the second shaft 44 However, it is larger than the conventional example shown in FIG. 16, and the inflow of lubricating oil is improved. Also, two retainers 10e, 20e
The thickness t _12e of the outer portion in the radial direction in the vertical direction with respect to the roller holders 14e, 24e is also smaller than the roller holders 14e, 24e.
Since the thickness _{e is} smaller than the thickness _t14e in the vertical direction, the outflow of the lubricating oil is also improved. For this reason, the amount of lubricating oil per unit time passing through the thrust needle roller bearing 1e becomes larger than that of the conventional example shown in FIG. 16, and it is possible to reliably prevent seizing of each part of the bearing. In addition, since the passage of the lubricating oil is less likely to be blocked by the retainers 10e and 20e, the lubricating oil is less likely to stay and the rise in oil temperature can be suppressed.

The upper and lower retainers 10e, 20e
As shown in FIG. 11, opposite to the one shown in FIG. 10, the inner plates 13e and 23e are vertically overlapped, and the outermost ends 18e and 2e of the outer plates 12e and 22e.
6e may be bent in the up and down direction to overlap with each other and caulked at the outermost end portion 18e of the outer plate portion 12e. Even in this case, of course, the two cages 1
The thickness _t13e in the vertical direction of a radially inner portion of the roller holding portions 14e, 24e formed by the roller holding portions 14e, 20e is lower than the roller holding portions 14e, 24e because the lower extension 16e exists.
e is thinner than the vertical thickness _t14e . Further, the roller holding portion 14e, the vertical thickness t _12e of the outer portion in the radial direction with respect to 24e, roller retaining portion 14e, thinner than the vertical thickness t _14e of 24e. Further, the roller holding portions 14e, 2
Vertical thickness t _14e of 4e, the diameter D of needle rollers 30e
smaller than e.

Finally, with reference to FIG.
A sixth embodiment of the last needle roller bearing will be described. FIG.
Is a sixth embodiment of the thrust needle roller bearing according to the present invention.
FIG. However, the needle rollers in FIG.
Not sectioned. Thrust needle roller bearing 1 shown in FIG.
f indicates each of the two retainers 10f and 20f at one position.
By bending only the two cages 10
f, 20f have a diameter relative to the roller holding portions 14f, 24f.
Thickness t of the outer part in the vertical direction _12fAnd roller holder
14f, 24f in the vertical direction of the radially inner portion
Thickness t_13fThe vertical thickness of the roller holding portions 14f, 24f
T_14fThrust needle shown in Fig. 1 in that it is thinner than
It is different from the roller bearing 1a.

That is, the thrust needle roller bearing 1f comprises a plurality of needle rollers 30f and two annular cages 10f, 20 which hold the plurality of needle rollers 30f in a circular shape at a predetermined pitch.
f. Here, two cages 10f, 2
0f has a plurality of substantially rectangular windows 11f, 21f longer than the needle roller length in the radial direction at the predetermined pitch, and is formed by punching and bending a cold rolled steel plate (SPCC) or the like, for example. It is formed. Each window 11f,
Holding portions 14f and 24f are formed on both side edges of 21f, and needle rollers 30f are formed by these roller holding portions 14f and 24f.
Are held vertically. Also,
A radially outer side of the roller holder 14f of the upper holder 10f of the two holders 10f, 20f is a lower extension 15f bent at a right angle from an outer end of the roller holder 14f.
And an outer plate portion 12f bent radially outward from the lower end of the lower extension portion 15f. An inner plate portion 13f that extends radially inward from the inner end of the roller holding portion 14f without being bent is provided on the radially inner side of the roller holding portion 14f of the upper holder 10f.
On the other hand, of the two cages 10f and 20f, the lower cage 2
The outer side of the roller holding portion 24f in the radial direction is formed by an outer plate portion 22f which extends radially outward from the outer end of the roller holding portion 24f without being bent, and the inner side in the radial direction is the inner end of the roller holding portion 24f. The upper extension 25f is bent at a right angle from the upper side, and the inner plate 23f is bent radially inward from the upper end of the upper extension 25f.

Then, the two retainers 10f and 20f are
The outer plates 12f and 22f are vertically overlapped with each other.
The innermost ends 16f, 26f of the inner plates 13f, 23f
Are bent in the vertical direction so as to fold over each other to form the inner plate portion 13.
fixed by swaging the innermost end 16f of f
It has become. Fix two retainers 10f and 20f
When the two retainers 10f and 20f make
Up and down of the radially outer portion with respect to the holding portions 14f and 24f
Thickness t_12fMeans that there is a downward extension 15f
From the thickness t of the roller holding portions 14f and 24f in the vertical direction.
_14fThinner than. On the other hand, the roller holding portions 14f and 24f
And the vertical thickness t of the radially inner portion_{13 f}Well, inclined
Because of the presence of the extension 25f, the roller holding portions 14f, 2
4f vertical thickness t_14fThinner. Also, roller holding
The vertical thickness t of the portions 14f and 24f _14fIs a needle roller
It is smaller than the diameter Df of 30f.

In the present embodiment, when lubricating each part of the bearing with the lubricating oil, the thickness in the vertical direction of the radially inner part with respect to the roller holding parts 14f, 24f formed by the two cages 10f, 20f. t _13f Gakoro holding portion 14f, so thinner than the vertical thickness t _14f of 24f, the inflow of the lubricating oil is improved in comparison with the thrust needle roller bearing of the prior art shown in FIG. 16. In addition, the vertical thickness t _{12f of the} radially outer portion of the roller retainers 14f, 24f is greater than the vertical thickness t _{14f of the} roller retainers 14f, 24f. Because of the thinness, the outflow of lubricating oil is also improved. Therefore, the amount of lubricating oil per unit time passing through the thrust needle roller bearing 1f is larger than that of the conventional example shown in FIG. 16, and it is possible to reliably prevent seizing of each part of the bearing. Further, since the passage of the lubricating oil is less likely to be blocked by the retainers 10f and 20f, the lubricating oil is less likely to stagnate and the rise in oil temperature can be suppressed.

The upper and lower retainers 10f, 20f
13, as shown in FIG. 13, opposite to the one shown in FIG. 12, the inner plates 13f, 23f are vertically overlapped, and the outermost ends 17f, 2f of the outer plates 12f, 22f.
7f may be fixed by bending the outermost end portion 17f of the outer plate portion 12f by bending the upper and lower portions 7f vertically. Even in this case, of course, the two cages 1
The thickness _t13f in the vertical direction of the inner portion in the radial direction with respect to the roller holding portions 14f, 24f formed by 0f, 20f has a downwardly extending portion 15f.
f is smaller than the thickness _t14f in the vertical direction. Further, the roller holding portion 14f, vertical thickness t _12f of the outer portion in the radial direction with respect to 24f, roller retaining portion 14f, thinner than the vertical thickness t _14f of 24f. In addition, the roller holding portions 14f, 2
The thickness t _14f in the vertical direction of 4f is the diameter D of the needle roller 30f.
smaller than f.

[0046]

EXAMPLES In order to verify the effect of the present invention, the amount of lubricating oil passing per unit time under the following measurement conditions was measured for both the thrust needle roller bearing of the present invention and the thrust needle roller bearing of the comparative example. Was measured. Measurement bearing: thrust needle roller bearing shown in FIG. 1 (example of the present invention), thrust needle roller bearing shown in FIG. 15 (comparative example) Number of measurements: 4 times Lubricating oil: ATF Oil temperature: 30 ° C., 80 14C: Passing oil amount measuring device shown in FIG. 14 A passing oil amount measuring device 50 shown in FIG. 14 uses a thrust needle roller bearing B between a fixed shaft portion 51 and a fixed shaft portion 52. The lubricating oil supplied from the oil tank 54 at a predetermined oil pressure via the oil supply pipe 53 is
Oil passage 55 and fixed shaft 51 and fixed shaft 52
Is supplied to the thrust needle roller bearing B through an oil passage 56 between them, and after passing through the bearing B, is discharged through an oil passage 57. Note that in FIG.
Is an on-off valve.

Table 1 shows the measurement results of the amount of lubricating oil passing per unit time for each measurement bearing.

[0048]

[Table 1]

Referring to Table 1, when the oil temperature of the thrust needle roller bearing of the present invention is 80 ° C. assuming that the amount of common oil is 1 when the oil temperature of the thrust needle roller bearing of the comparative example is 80 ° C. 6 times the amount of oil has passed through the bearing.

[0050]

As described above, according to the thrust needle roller bearing according to the first aspect of the present invention, the two cages are configured such that the radial length of the roller holding portion is greater than the roller length. By shortening and bending at least one of the two cages, the thickness of at least one of the outer portion and the inner portion in the radial direction with respect to the roller holding portion is held in the vertical direction. The thickness is made thinner than the vertical thickness of the part, so that the thickness is reduced, and the inflow or outflow of lubricating oil on at least one of the radially outer portion and the inner portion with respect to the roller holding portion is reduced. And the amount of lubricating oil per unit time passing through the bearing can be increased, and seizure of each part of the bearing can be reliably prevented. In addition, since the passage of the lubricating oil is less likely to be blocked by the retainer, the lubricating oil is less likely to stay and the rise in oil temperature can be suppressed.

Further, according to the thrust needle roller bearing according to claim 2 of the present invention, in the invention according to claim 1, the two cages are at least one of the two cages. Since the vertical thickness of both the outer portion and the inner portion in the radial direction with respect to the roller holding portion is formed to be smaller than the thickness of the roller holding portion in the vertical direction by bending the roller holding portion, The thickness is reduced, and the lubricating oil inflow and outflow of both the outer portion and the inner portion in the radial direction with respect to the roller holding portion is improved, and the amount of lubricating oil per unit time passing through the bearing is further increased. Therefore, seizure of each part of the bearing can be reliably prevented. Further, the effect of suppressing an increase in the oil temperature can be improved as compared with the first aspect of the present invention.

Further, according to the thrust needle roller bearing according to claim 3 of the present invention, in the invention as set forth in claim 1 or 2, the two cages are provided with a radially innermost end and an innermost end. Since one of the outer ends is fixed by caulking, the two cages can be securely fixed, and the needle rollers held by the cages can be prevented from separating. . In addition, it is possible to loosely fit the shaft on one side of the caulked radially innermost end and outermost end as a guide surface.

According to the thrust needle roller bearing according to claim 4 of the present invention, in the invention according to claim 3,
Since the other end of the crimped innermost end or outermost end of one of the two cages is bent to a substantially right angle, the side surface of the other end other than the crimped Can be loosely fitted on the shaft as a guide surface, and the usable range of the bearing can be expanded.

[Brief description of the drawings]

1A and 1B show a first embodiment of a thrust needle roller bearing according to the present invention, wherein FIG. 1A is a partial plan view, and FIG.
Sectional view along line B-1B, (C) is 1C-1 of (B).
It is sectional drawing which followed the C line. However, FIG. 1 (B) and FIG.
In (C), the needle rollers have no cross section.

FIG. 2 is a partial sectional view showing a state of use of the thrust needle roller bearing of FIG. 1; However, the needle rollers are not sectioned.

FIG. 3 is a partial sectional view of a modification of the thrust needle roller bearing shown in FIG. However, the needle rollers are not sectioned.

4A and 4B show a second embodiment of a thrust needle roller bearing according to the present invention, wherein FIG. 4A is a partial plan view, and FIG.
It is sectional drawing along the B-4B line. However, the needle rollers are not cross-sectioned in FIG.

FIG. 5 is a partial sectional view of a modified example of the thrust needle roller bearing shown in FIG. However, the needle rollers are not sectioned.

6A and 6B show a third embodiment of a thrust needle roller bearing according to the present invention, wherein FIG. 6A is a partial plan view, and FIG.
It is sectional drawing along the B-6B line. However, in FIG. 6B, the needle rollers are not sectioned.

FIG. 7 is a partial sectional view of a modification of the thrust needle roller bearing shown in FIG. 6; However, the needle rollers are not sectioned.

8A and 8B show a thrust needle roller bearing according to a fourth embodiment of the present invention, wherein FIG. 8A is a partial plan view, and FIG.
It is sectional drawing along the B-8B line. However, the needle rollers are not cross-sectioned in FIG.

FIG. 9 is a partial sectional view of a modification of the thrust needle roller bearing shown in FIG. However, the needle rollers are not sectioned.

FIG. 10 is a partial cross-sectional view of a thrust needle roller bearing according to a fifth embodiment of the present invention. However, the needle rollers are not sectioned.

11 is a partial sectional view of a modification of the thrust needle roller bearing shown in FIG. However, the needle rollers are not sectioned.

FIG. 12 is a partial sectional view of a thrust needle roller bearing according to a sixth embodiment of the present invention. However, the needle rollers are not sectioned.

FIG. 13 is a partial cross-sectional view of a modified example of the thrust needle roller bearing shown in FIG. However, the needle rollers are not sectioned.

FIG. 14 is a schematic view of a passing oil amount measuring device.

FIG. 15 shows a conventional thrust needle roller bearing;
(A) is a partial plan view, (B) is 15B-15B of (A).
FIG. 7C is a cross-sectional view taken along line 15C-15C of FIG. However, FIG. 15 (B) and FIG.
In (C), the needle rollers have no cross section.

FIG. 16 is a partial sectional view showing a state of use of the thrust needle roller bearing of FIG. 15; However, the needle rollers are not sectioned.

[Explanation of symbols]

1a, 1b, 1c, 1d, 1e, 1f Thrust needle roller bearings 10a, 10b, 10c, 10d, 10e, 10f Upper retainers 11a, 11b, 11c, 11d, 11e, 11f Windows 12a, 12b, 12c, 12d, 12e, 12f Outer plate portions 13a, 13b, 13c, 13d, 13e, 13f Inner plate portions 14a, 14b, 14c, 14d, 14e, 14f Roller holding portions 15a, 15b, 16e, 15f Lower extension portions 16a, 26a, 16b , 26b, 15c, 25c, 1
5d, 25d, 15e inclined extension parts 17a, 27a, 17b, 27b, 17c, 27c, 1
7d, 27d, 17e, 25e, 16f, 26f Innermost ends 18a, 28a, 18b, 28b, 16c, 26c, 1
6d, 26d, 18e, 26e, 17f, 27f Outermost ends 20a, 20b, 20c, 20d, 20e, 20f Lower retainers 21a, 21b, 21c, 21d, 21e, 21f Windows 22a, 22b, 22c, 22d, 22e, 22f Outer plate portions 23a, 23b, 23c, 23d, 23e, 23f Inner plate portions 24a, 24b, 24c, 24d, 24e, 24f Roller holding portions 25a, 25b, 25f Upper extension portions 30a, 30b, 30c, 30d , 30e, 30f Needle roller 50 Passing oil amount measuring device 51 Fixed shaft portion 52 Rotating shaft portion 53 Oil supply pipe 54 Oil tank 55, 56, 57 Oil passage 58 Open / close valve

Claims (4)

[Claims] The present invention comprises a plurality of needle rollers and two annular cages, each of the two cages having a plurality of windows that are longer than a roller length in a radial direction. A thrust needle roller bearing in which a plurality of needle rollers are vertically sandwiched and held by a roller holding portion formed in the plurality of windows, wherein the two cages are arranged in a radial direction of the roller holding portion. Is shorter than the roller length, and at least one of the radially outer portion and the inner portion with respect to the roller holding portion by bending at least one of the two cages. A thrust needle roller bearing, wherein the vertical thickness is formed to be smaller than the vertical thickness of the roller holding portion. 2. The two cages, wherein at least one of the two cages is bent so that both the outer portion and the inner portion in the radial direction with respect to the roller holding portion are vertically oriented. The thrust needle roller bearing according to claim 1, wherein the thickness of the thrust needle roller bearing is formed to be smaller than the thickness of the roller holding portion in the vertical direction. 3. The device according to claim 1, wherein the two cages are fixed by caulking one of an innermost end and an outermost end in a radial direction. Thrust needle roller bearing. 4. The crimped innermost end or the outermost end of one of the two cages is bent at a substantially right angle. 3
Thrust needle roller bearing as described.