JPH10274242A - Shell type needle roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing which is provided with a flange such as heat roller of which cross-section height is strictly limited and which necessitates an inner ring and which is excellent in sealing property and easy in mounting to and dismounting from a shaft. SOLUTION: A flange 22 is provided on the axial one end side of an outer ring 21 of a shell type needle roller bearing 20, a bent part 23 is formed at the top end of the flange, and an inwardly bent part 23a is formed at the final limit forward of the bend part 23. Also a side plate 25 is installed on the same end side as the flange 22 of the inner ring 24 and the side plate 25 is fitted closely, at an overlap, to the flange 22 of the outer ring 21 in order to maintain the sealing property of grease. In addition, the bent part 23a at the final limit forward of the flange 22 of the outer ring 21 is close-fitted to the top end of the side plate 25 of the inner ring 24 so as to assemble the inner ring 24 integrally with the outer ring 21. Thus the attaching and detaching of the bearing to from the shaft 2 is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a needle roller bearing having a flange and an outer ring and an inner ring integrally combined.

[0002]

2. Description of the Related Art Small rollers such as a paper feed roller and a heat roller built in office equipment such as a copying machine are often supported by a steel plate frame of the equipment body. A flanged bearing is used to fix the axial direction of the roller. In recent years, many of these office equipment have been required to have a high-speed processing capability, and therefore, rolling bearings capable of coping with high-speed rotation have been employed.

FIGS. 10 and 11 show examples of a prior art in which a ball bearing is used for a heat roller of a copying machine. A heater (not shown) is incorporated in the heat roller 1, and a ball bearing 4 is mounted on a shaft 2 of the heat roller 1 via a heat insulating sleeve 3, and an inner ring 5 of the heat roller 1 is provided with a flange provided on the heat insulating sleeve 3. The axial direction is fixed at 3a. The heat insulating sleeve 3 is prevented from falling off the shaft 2 by a retaining ring 6.

A non-metallic material having a low thermal conductivity such as a heat-resistant resin is usually used for the heat insulating sleeve 3. Therefore, the bearing to be used must have the inner ring 5 like the ball bearing 4 described above. A retaining ring 8 is attached to an outer ring 7 of the ball bearing 4, and the heat roller 1 is supported by a steel plate frame 9 of a device body via the ball bearing 4, and is fixed in an axial direction by the retaining ring 8. .

A pressure roller 10 is pressed against a heat roller 1 of a copying machine by a spring 11, as shown in FIG. A drive gear 12 is attached to the shaft end of the heat roller 1, and the heat roller 1 rotates while being pressed by a pressure roller 10, and the toner is heated and pressed between these two rollers 1 and 10. Is fixed on copy paper.

When the ball bearing 4 is used for the heat roller 1 in consideration of the distance between the shafts of the two rollers 1 and 10, in order to prevent interference with the bearing 13 of the pressure roller 10, It is necessary to reduce the thickness of the heat insulating sleeve 3. When the thickness of the heat insulating sleeve 3 is small, the heat insulation of the ball bearing 4 becomes insufficient, and there is a problem that the performance of the bearing is deteriorated due to a dimensional change due to thermal expansion of the ball bearing 4 and deterioration of the lubricant. On the other hand, in order to increase the thickness of the heat insulating sleeve 3, increasing the distance between the shafts requires the heat roller 1 or the pressure roller 1.
There is a problem that the device becomes larger with an increase in the diameter of 0.

In order to address the above problem, it is conceivable to employ a shell-type needle roller bearing. The needle needle roller bearing has an outer ring formed by precisely pressing a thin steel plate into a thin steel plate, and has a feature that the sectional height of the bearing can be reduced. As a shell-shaped needle roller bearing with a flange, there is one disclosed in Japanese Utility Model Laid-Open No. 5-86034. In this bearing, as shown in FIG. 12, a separate flange member 15 formed by pressing a thin steel plate outside the outer ring 14 is press-fitted and fixed, and this flange member 15 is fixed to the side plate 1.
6 also plays a role. That is, the needle roller 17 is held by the retainer 18, and is fixed in the axial direction by the side plate 16 provided on the flange member 15 and the side plate 19 of the outer ring 14.

When the shell-shaped needle roller bearing with a flange is used in a portion where the inner ring is essential, such as the bearing of the heat roller 1, it is necessary to arrange the inner ring as a separate part. If the inner ring is made as a separate part, that is, if it is a separate type bearing, there is a problem that the sealing performance of grease as a lubricant becomes insufficient and grease easily leaks.
In addition, the separation type bearing has a problem that handling such as attachment and detachment to and from the shaft 2 becomes complicated. Therefore, an object of the present invention is to provide a bearing having a severe restriction on the sectional height of the bearing and a flanged bearing such as a heat roller which requires an inner ring, which has good grease sealing properties and can be easily attached to and detached from a shaft. It is to be.

[0009]

According to a first aspect of the present invention, a flange is provided at one axial end of an outer ring of a needle needle roller bearing and a side plate is provided at the other end thereof. A bent portion is formed at the tip of the flange, and furthermore, the front end is bent inward, and a side plate is provided on the same end side as the flange of the inner ring. The configuration in which the tip of the side plate is fitted and held in the bent portion at the top of the flange is adopted.

The grease sealed between the inner ring and the outer ring of the shell needle roller bearing tends to escape to the outer ring side due to centrifugal force caused by rotation of the shaft. In the shell-type needle roller bearing according to the present invention, a side plate is provided on the inner ring on the same end side as the flange of the outer ring, and the side plate is in close contact with the flange of the outer ring with an overlap margin, so that grease is centrifugally generated from this portion. Outflow can be prevented. At the other end in the axial direction, the outflow of grease due to centrifugal force is prevented by the side plate of the outer ring. In addition, a bent portion is formed at the end of the flange of the outer ring, and the front end is bent inward, and the end of the side plate of the inner ring is fitted and held in the bent portion, so that the inner ring and the outer ring of the bearing are integrally formed. Can be attached to and detached from the shaft.

In the second invention, a flange is provided at one end in the axial direction of the outer ring of the shell-shaped needle roller bearing, and a side plate is provided at the other end, and a bent portion is formed at the tip of the flange.
An inner ring retaining member having an inward bent portion is fitted or engaged on the outer peripheral side or inner peripheral side of the bent portion, and a side plate is provided on the same end side as the flange of the inner ring, and the side plate is This configuration employs a configuration in which the flange is closely attached to the flange with an overlap margin, and the tip of the side plate is fitted and held between the flange of the outer race and the bent portion of the inner race retaining member.

In other words, in this aspect, instead of bending the outermost end of the outer ring flange inward, the inner ring retaining member having the inwardly bent portion is fitted or engaged with the bent portion of the outer ring flange, and the inner ring is removed. The distal end of the side plate of the inner ring is fitted into the bent portion of the stop member so as to integrally hold the outer ring and the inner ring. Since no load acts on the inner ring retaining member, it may be made of resin instead of steel plate.

According to a third aspect of the present invention, a flange is provided at one end in the axial direction of an outer ring of a shell type needle roller bearing, and a side plate is provided at the other end, and a side plate is provided at the same end as the flange of the inner ring. The outer ring flange and inner ring side plate
A cover member having an inward bent portion at both ends in the axial direction is covered, the bent portion on one end side of the cover member is in close contact with the side plate of the inner race with a margin, and the tip of the flange is the other end of the cover member. That is, a configuration was adopted in which it was fitted and held in a groove provided in the base of the bent portion on the side.

That is, in this aspect, the flange of the outer ring and the tip of the side plate of the inner ring are covered with a cover member having inward bent portions at both ends in the axial direction, and the bent portion at one end of the cover member is overlapped with the side plate of the inner ring. The outer ring and the inner ring are held together by preventing the grease from leaking out by fitting the end of the flange of the outer ring into the base of the bent portion on the other end side while keeping the outer ring and the inner ring together.

Further, by providing a projection facing the flange side at a portion of the inner ring side plate facing the flange of the outer ring, when the inner ring moves in the axial direction when the grease is reduced, the side plate of the inner ring and the outer ring may be formed. The contact with the flange is set to point contact or line contact, and the generation of metal noise and the generation of metal abrasion powder due to the rotation of the roller can be reduced. In addition,
The above-mentioned protrusions may be formed in a ring shape in addition to the dotted ones.

In the first to third inventions described above, the tip of the axial end opposite to the side plate of the inner ring is extended outward from the axial position of the side plate of the outer ring.
The gap between the end of the outer ring side plate and the inner ring can be made sufficiently narrow to form precisely, and when the rotation of the shaft is stopped, it is possible to prevent grease from flowing and leaking from this gap. it can. At the tip of the inner ring opposite to the side plate, when the inner ring is pressed, a hanging surface is formed here, so that the axial position of the inner ring tip matches the position of the side plate of the outer ring. In such a case, the gap cannot be formed with high accuracy.

Further, by forming an inward bent portion at the end of the inner ring extended outside the outer ring side plate, the bent portion is hooked on the end surface of the heat insulating sleeve to fix the axial movement of the inner ring. Since it is possible, it is not necessary to provide a flange for stopping the inner ring on the heat insulating sleeve. As described above, since the inner ring is formed by pressing a thin steel plate, the inward bent portion of the inner ring is formed by leaving a part of the bottom of the cup that is deep drawn by pressing. be able to.

In the fourth invention, a flange is provided at one end in the axial direction of the outer ring of the shell-shaped needle roller bearing, a side plate is provided at the other end, and a side plate is provided at the same end as the flange of the inner ring. The side plate was in close contact with the flange with an overlap margin, and formed an outward bent portion on the other end side in the axial direction of the inner ring, and the outer ring was fitted and held between the bent portion and the side plate of the inner ring. The configuration was adopted.

In this embodiment, the sealing of the grease at the overlap between the flange of the outer ring and the side plate of the inner ring is the same as in the first and second inventions described above. The difference is that the outer ring and the inner ring are held integrally by the outwardly bent portion and the side plate.

Further, in each of the above-described embodiments, the thrust receiving member is inserted into an overlapping portion between the side plate of the inner race and the flange of the outer race or the bent portion at one end of the cover member, so that the grease is cut off at this position. In this case, it is possible to reliably prevent the metal from coming into contact, and to prevent the generation of metal noise and the generation of metal abrasion powder accompanying the rotation of the roller.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 show a first embodiment. FIG. 1 shows a state in which a shell-shaped needle roller bearing 20 of the embodiment is mounted and fixed to a shaft 2 of a heat roller 1 similar to FIG. An outward flange 22 is provided at one axial end of an outer ring 21 of the bearing 20, a bent portion 23 is formed at the tip thereof, and an inward bent portion 23a is formed at the foremost end thereof.
The heat roller 1 is axially fixed to the steel plate frame 9 by the flange 22 of the outer ring 21.

An outer side plate 25 is provided on the same end of the inner ring 24 as the flange 22. The side plate 25 is in close contact with the flange 22 of the outer ring 21 with a margin, and the tip of the side plate 25 is And the inner race 24 and the outer race 21 are integrally combined. Side plate 25 of the inner ring 24
The overlap margin of the flange 22 of the outer ring 21 slides with each other,
A slight thrust load generated with the rotation of the shaft 2 of the heat roller 1 is received here.

Grease is sealed between the inner ring 24 and the outer ring 21, and the needle rollers 26 are held and stored in the holder 27 here. These needle rollers 26 and retainers 27
Is fixed at one end in the axial direction by an outward side plate 25 of the inner ring 24 and at the other end in the axial direction by an inward side plate 28 of the outer ring 21. In this embodiment, since the sectional height of the bearing is small,
Compared to FIG. 10, the heat insulating sleeve 3 can be formed thicker.

FIG. 2 shows a heat roller 1 and a pressure roller 10.
Shows a state in which is incorporated in the steel plate frame 9. As in FIG. 11, a pressure roller 10 is attached to the heat roller 1 by a spring 11.
, And the heat roller 1 is rotationally driven by the gear 12 at the shaft end. Comparing FIG. 2 with FIG. 11, although the thickness of the heat insulating sleeve 3 is larger in the case of FIG. 2, the allowance for the center distance between the heat roller 1 and the pressure roller 10 is as shown in FIG. Is bigger. Therefore, the outer diameter of the heat roller 1 can be further reduced. As a result, the heat capacity of the heat roller 1 is reduced, so that the rise time at the time of startup can be shortened.

FIGS. 3 and 4 show that the inner ring retaining members 29, 30 having inwardly bent portions 29a, 30a are replaced by outer ring 21 flanges 22 instead of the foremost bent portion 23a of the flange 22 of the outer ring 21 of FIG. The embodiment shown in FIG. FIG. 3 is a second embodiment in which the inner ring retaining member 29 is engaged with the outer peripheral side of the bent portion 23 of the outer ring 21 flange 22. FIG. 4 is an inner peripheral side of the bent portion 23 in which the inner ring retaining member 30 is engaged. It is a 3rd embodiment fitted in. In any case, the front end of the side plate 25 of the inner race 24 is bent between the flange 22 of the outer race 21 and the bent portions 29a, 30 of the inner race retaining members 29, 30.
a, the inner race 24 and the outer race 21 are integrally combined.

FIG. 5 shows a fourth embodiment in which the axial end opposite to the side plate 25 of the inner race 24 in FIG. 3 has an extension 24a protruding outside the axial position of the side plate 28 of the outer race 21. The form is shown. In this embodiment, since the hanging surface 24b formed at the time of press working is located outside the gap between the side plate 28 of the outer ring 21 and the inner ring 24, the size of the gap varies depending on the shape of the hanging surface 24b. Therefore, the gap can be sufficiently narrowed with high accuracy.

FIG. 6 shows a fifth embodiment in which an inward bent portion 24c is formed at the tip of the axial end opposite to the side plate 25 of the inner race 24 extending outside the side plate 28 of the outer race 21 in FIG. 1 shows an embodiment. In this embodiment, the bent portion 2
Since the axial direction of the inner ring 24 can be fixed by hooking 4c on the end surface of the heat insulating sleeve 3, the heat insulating sleeve 3 can be formed in a straight shape without a flange.

FIG. 7 shows a state where the shell-shaped needle roller bearing 31 of the sixth embodiment is mounted on the shaft 2 of the heat roller 1 as in FIG. An outward flange 33 is provided at one axial end of the outer race 32, an inward side plate 34 is provided at the other end, and an outward side plate 36 is provided at the same end as the flange 33 of the inner race 35. The side plate 36 is the outer ring 3
The second flange 33 is in close contact with the overlap margin. An outward bent portion 3 is provided at the other end of the inner ring 35 in the axial direction.
The outer ring 32 is fitted between the bent portion 37 and the side plate 36, so that the outer ring 32 and the inner ring 35 are integrally combined. In this embodiment,
The tip of the side plate 36 of the inner ring 35 is the flange 3 of the outer ring 32.
The outer ring 32 and the inner ring 35 are hardly separated from each other.

FIG. 8 shows a seventh embodiment in which, in FIG. 6, a thrust receiving member 38 formed by molding a fluororesin into a ring is inserted into an overlapping portion between the flange 22 of the outer ring 21 and the side plate 25 of the inner ring 24. Show. As described above, the overlapping margins slide with each other when the heat roller 1 rotates, and receive a slight thrust load generated as the heat roller 1 rotates. Therefore, the above-described thrust receiving member 38
As the material, a material having a small friction coefficient at the time of sliding or a material having self-lubricating property is suitable.

FIG. 9 shows a state in which the shell-shaped needle roller bearing 39 of the eighth embodiment is mounted on the shaft 2 of the heat roller 1 as in FIG. An outward flange 41 is provided at one axial end of the outer ring 40, an inward side plate 42 is provided at the other end, and an outward side plate 44 is provided at the same end as the flange 41 of the inner race 43. The side plate 44 and the front end of the flange 41 have inwardly bent portions 4 at both ends in the axial direction.
It is covered with a cover member 47 having 5 and 46.

The side plate 44 of the inner ring 43 is in close contact with the bent portion 45 on one end side with an overlap margin.
The part facing the flange 41 is a flange 41
A projection 48 facing the side is provided. This projection 48
Although not shown, six are provided at equal intervals in the circumferential direction. The groove 4 is formed at the base of the bent portion 46 at the other end.
9 is formed, and the front end of the flange 41 is fitted into the groove 49, so that the outer ring 40, the inner ring 43, and the cover member 47 are integrally combined. The axial end of the inner ring 43 on the side opposite to the side plate 44 is extended to the outside of the side plate 42 of the outer ring 40 as in the case of FIG. I have.

The outer race in each of the above embodiments has rigidity because both ends in the axial direction are bent by forming side plates and flanges. Therefore, there is an advantage that dimensional accuracy of the outer ring body straight portion can be easily ensured since springback during press working and thermal distortion during heat treatment hardly occur. The same applies to the inner ring in the embodiment in which the bent portions are formed at both ends in the axial direction.

[0033]

As described above, according to the shell needle roller bearing of the present invention, since the side plate is provided on one end side in the axial direction of the inner ring, and this side plate is in close contact with the flange of the outer ring with a margin, the grease is provided. Leakage can be reliably prevented, and since the bent portion is formed on the outer ring or the inner ring to integrally combine the inner ring and the outer ring, the bearing can be easily attached to and detached from the shaft.

In another aspect, a cover member having bent portions at both ends in the axial direction covers the outer ring flange and the tip of the inner ring side plate, and the bent portion at one end is brought into close contact with the inner ring side plate with an overlap margin. By fitting the distal end of the outer ring flange into the base of the bent portion, grease leakage can be prevented and the inner ring and the outer ring can be integrally combined.

Further, since the bearing of the present invention can have a reduced sectional height, the heat insulating sleeve of the heat roller can be made thicker to sufficiently insulate the bearing, and the life of the bearing can be greatly extended. Further, the outer diameter of the heat roller can be further reduced, and the heat capacity of the heat roller can be reduced to shorten the startup time at the time of startup.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a shell needle roller bearing according to a first embodiment.

FIG. 2 is a partial vertical sectional view of a heat roller equipped with the bearing of FIG. 1;

FIG. 3 is a longitudinal sectional view of a shell-type needle roller bearing according to a second embodiment.

FIG. 4 is a longitudinal sectional view of a shell-type needle roller bearing according to a third embodiment;

FIG. 5 is a longitudinal sectional view of a shell needle roller bearing according to a fourth embodiment;

FIG. 6 is a longitudinal sectional view of a shell needle roller bearing according to a fifth embodiment.

FIG. 7 is a longitudinal sectional view of a shell needle roller bearing according to a sixth embodiment.

FIG. 8 is a longitudinal sectional view of a shell needle roller bearing according to a seventh embodiment.

FIG. 9 is a longitudinal sectional view of a shell needle roller bearing according to an eighth embodiment.

FIG. 10 is a longitudinal sectional view of a conventional ball bearing.

11 is a partial vertical sectional view of a heat roller equipped with the bearing of FIG. 10;

FIG. 12 is a longitudinal sectional view of a conventional needle needle roller bearing of a shell type.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat roller 2 shaft 3 Heat insulation sleeve 3a flange 4 Ball bearing 5 Inner ring 6 Retaining ring 7 Outer ring 8 Retaining ring 9 Steel plate frame 10 Pressure roller 11 Spring 12 Gear 13 Pressure roller bearing 14 Outer ring 15 Flange member 16 Side plate 17 Needle-like Roller 18 Cage 19 Side plate 20 Shell-shaped needle roller bearing 21 Outer ring 22 Flange 23, 23a Folded portion 24 Inner ring 24a Extension 24b Hanging surface 24c Folded portion 25 Side plate 26 Needle roller 27 Cage 28 Side plate 29, 30 Inner ring stopper Members 29a, 30a Folded portion 31 Shell-shaped needle roller bearing 32 Outer ring 33 Flange 34 Side plate 35 Inner ring 36 Side plate 37 Folded portion 38 Thrust receiving member 39 Shell-shaped needle roller bearing 40 Outer ring 41 Flange 42 Side plate 43 Inner ring 43a Folded portion 44 side 45, 6 bent portions 47 cover member 48 projection 49 groove

Claims (8)

[Claims] 1. A flange is provided at one axial end of an outer ring of a shell-type needle roller bearing, and a side plate is provided at the other end. A bent portion is formed at the tip of the flange, and the leading end thereof is directed inward. A shell that is bent and provided with a side plate on the same end side as the flange of the inner ring, the side plate is in close contact with the flange with an overlap margin, and the tip of the side plate is fitted and held in the bent portion at the front end of the flange. Needle roller bearings. 2. A shell is provided with a flange at one axial end of an outer ring of a needle roller bearing and a side plate at the other end, and a bent portion is formed at the tip of the flange. On the peripheral side, an inner ring retaining member having an inward bent portion is fitted or engaged, and a side plate is provided on the same end side as the flange of the inner ring, and this side plate is in close contact with the flange with an overlap margin, And a shell-shaped needle roller bearing in which the tip of the side plate is fitted and held between the flange of the outer ring and the bent portion of the inner ring retaining member. 3. An outer ring of a shell-type needle roller bearing is provided with a flange at one axial end and a side plate at the other end, and a side plate at the same end as the flange of the inner ring. The end of the side plate is covered with a cover member having inwardly bent portions at both ends in the axial direction, and the bent portion at one end side of the cover member is in close contact with the side plate of the inner ring with an overlap margin, and the end of the flange is A shell-shaped needle roller bearing fitted and held in a groove provided in a base of a bent portion on the other end side of the cover member. 4. The needle needle roller bearing according to claim 3, wherein a projection facing the flange side is provided at a portion of the inner ring side plate facing the flange of the outer ring. 5. The inner ring according to claim 1, wherein an end of an axial end of the inner ring opposite to the side plate extends outwardly from an axial position of the outer ring side plate. Shell type needle roller bearing. 6. An inwardly bent portion is formed at a tip of the inner ring extended outside the outer ring side plate.
2. A needle needle roller bearing according to item 1. 7. An outer ring of a shell type needle roller bearing is provided with a flange at one end in the axial direction and a side plate at the other end, and a side plate is provided at the same end as the flange of the inner ring. A shell-shaped needle roller in which an outer bent portion is formed on the other end side of the inner ring in the axial direction, and an outer ring is fitted and held between the bent portion and the side plate of the inner ring. bearing. 8. The thrust receiving member according to claim 1, wherein a thrust receiving member is inserted into an overlapping portion between the side plate of the inner race and a flange of the outer race or a bent portion at one end of the cover member. Shell type needle roller bearing.