JP2000230562A - Rolling bearing - Google Patents

Abstract

(57) [Problem] To accurately regulate the amount of lubricating oil flowing through the inside of a ball bearing. SOLUTION: A contact type seal ring 10 is provided between an outer ring 3 and an inner ring 5. A throttle hole 15 for allowing the lubricating oil to flow is formed in a part of the core metal 11 constituting the seal ring 10. The amount of lubricating oil flowing through the inside of the ball bearing 1 is regulated by the area or number of the throttle holes 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION A rolling bearing according to the present invention is incorporated in, for example, a transmission for an automobile (including a manual transmission and an automatic transmission) to rotatably support a rotating shaft and a gear and to each part. It is used to regulate the amount of lubricating oil to be supplied to an appropriate value.

[0002]

2. Description of the Related Art A transmission for an automobile incorporates a plurality of rotating shafts and many gears. These rotating shafts and gears are rotatably supported on the housing and the support shaft by rolling bearings such as ball bearings, tapered roller bearings, and cylindrical roller bearings. Further, during operation of the transmission, lubricating oil is supplied to frictional portions such as rolling bearings from an oil supply pump incorporated in the transmission. Since there are many friction parts to be lubricated, they are present in the upstream part in order to supply necessary and sufficient lubricating oil to the friction part existing in the downstream part with respect to the flow of the lubricating oil. It is necessary to prevent excessive lubricating oil from being supplied to the friction portion. For this reason, conventionally, the amount of the lubricating oil flowing while passing through each rolling bearing has been regulated by each rolling bearing itself. That is, a Z seal, V
Attach a non-contact type seal ring called a seal etc.,
The lubricating oil is made to flow through an annular gap between the peripheral edge of the seal ring and the peripheral surface of the inner ring or the outer ring constituting the rolling bearing. In order to adjust the amount of lubricating oil passing through the rolling bearing, the inner diameter (or outer diameter) of the seal ring is changed, and the inner peripheral edge (or outer peripheral edge) of the seal ring and the outer peripheral surface of the inner ring (or The area of the annular gap existing between the annular gap and the inner peripheral surface of the outer ring is changed.

[0003]

As described above, in the case of the structure in which the flow rate of the lubricating oil is regulated by using the non-contact type seal ring, the peripheral portion of the seal ring and the peripheral surface of the inner ring or the outer ring are formed. It was difficult to accurately regulate the area of the annular gap between them, and it was difficult to regulate the flow rate accurately. On the other hand, a notch may be formed in the peripheral portion of a contact-type seal ring called a TM seal, and the flow rate of the lubricating oil flowing through the notch may be adjusted by changing the size of the notch. Have been. However, in the case of such a structure, the flow rate of the lubricating oil flowing through the notch may gradually change due to wear of the seal ring due to long-term use. The present invention has been made in order to realize a rolling bearing that eliminates any of these disadvantages.

[0004]

According to the present invention, there is provided a rolling bearing comprising:
As with the widely known radial type rolling bearings, an outer ring having an outer raceway on the inner peripheral surface, an inner racer having an inner raceway on the outer peripheral surface, and rolling between these outer raceways and the inner raceway. And a plurality of rolling elements provided in the first section. In particular, in the rolling bearing of the present invention, a ring-shaped core metal and this core metal are reinforced on either one of the inner peripheral surface at the end of the outer race and the outer peripheral surface at the end of the inner race. And one peripheral edge of a seal ring made of an elastic sealing material. Then, the sealing material constituting the other peripheral portion of the seal ring is slid over the entire periphery of the other of the inner peripheral surface at the end of the outer ring and the outer peripheral surface at the end of the inner ring. In contact. At least one aperture is formed in a part of the metal core so that both surfaces of the seal ring communicate with each other.

[0005]

In the case of the rolling bearing of the present invention constructed as described above, a predetermined amount of lubricating oil flows through the inside of the rolling bearing through a throttle hole formed in the seal ring. The area of the throttle hole can be accurately regulated, and the area does not change even after long-term use. Therefore, the amount of lubricating oil flowing while passing through the rolling bearing can be regulated with high accuracy for a long period of time.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS The drawings illustrate one embodiment of the present invention.
An example is shown. This example shows a case where the present invention is applied to a deep groove type ball bearing 1. This ball bearing 1 has an outer ring 3 having a deep groove type outer ring raceway 2 on the inner peripheral surface and an inner ring having a deep groove type inner ring raceway 4 on the outer peripheral surface, similarly to a conventionally well known deep groove type ball bearing. 5 and these outer ring raceways 2
A plurality of balls 6, each of which is a rolling element, provided so as to roll freely between the inner ring raceway 4 and the inner raceway 4; Each of these balls 6
Are rotatably held by a holder 7 in a state of being arranged at equal intervals in the circumferential direction.

A pair of locking grooves 8 are formed at both ends of the inner peripheral surface of the outer ring 3 over the entire circumference. or,
At both ends of the outer peripheral surface of the inner ring 5, a pair of inclined surfaces 9, 9 each having a conical convex shape, which are inclined in such a direction that the outer diameter increases toward the center in the axial direction of the inner ring 5, are respectively provided. It is formed over the circumference. Then, of the pair of locking grooves 8, 8, the locking groove 8 at one end (right end in the drawing)
Further, the outer peripheral edge of the ring-shaped seal ring 10 is locked over the entire circumference.

The seal ring 10 is formed by bending a thin steel plate so as to form a ring-shaped core metal 11 as a whole.
And, made of an elastic material such as an elastomer such as rubber,
And a sealing material 12 reinforced by the core metal 11. The metal core 11 is locked to the inner circumferential surface at one end of the inner ring 5 by locking the folded portion 13 having a substantially C-shaped cross section formed on the outer peripheral edge portion to the locking groove 8. .
In addition, the sealing material 12 is attached to not only a portion closer to the outer diameter of the metal core 11 but also to a portion closer to the inner diameter of the metal core 11, including both inner and outer peripheral portions of the folded portion 13. Of these, a part of the sealing material 12 attached to the portion closer to the inner diameter protrudes inward in the diametric direction from the inner peripheral edge of the cored bar 11 to form a seal lip 14 whose inner diameter can be elastically expanded and contracted. . The inner peripheral edge of the seal lip 14 is brought into elastic contact with the inclined surface 9 at one end of the pair of inclined surfaces 9 over the entire periphery. With this configuration, the seal ring 10 blocks the inner peripheral surface at one end of the outer ring 3 and the outer peripheral surface at one end of the inner ring 5 over the entire circumference.

A circular or elliptical aperture 15 is formed in a part of the core 11 constituting such a seal ring 10.
At least one is formed so that both surfaces of the seal ring 10 communicate with each other. In the case of the example shown in the figure, the throttle hole 15 is formed with a part of the core metal 11 by the sealing material 12.
It is formed in the part not covered by. Therefore, the operation of forming the aperture 15 can be easily performed by punching with a press, and the area of the aperture 15 formed can be regulated to a desired value.

However, such a throttle hole 15 should be formed.
The sealing material 12 is applied to one side surface (portion indicated by a broken line in the drawing) of a middle portion in the diameter direction of the core metal 11 by 0.01 to 0.1.
It can be coated with a thickness of about mm. In the case of the sealing material 12 having such a thickness, when the drawing hole 15 is punched by a press, the sealing material 12 does not hinder the punching work, and the formed drawing hole 15 is not hindered.
The area of the camera does not become unstable. Moreover, the core metal 11
By forming the sealing material 12 on the outer peripheral side and the sealing material 12 on the inner peripheral side continuously and integrally formed, the molding operation for attaching and fixing the sealing material 12 to the core metal 11 can be performed easily and with high quality. It can be performed stably. On the other hand, the sealing material 1 covering the intermediate portion of the core metal 11
When the thickness of the hole 2 is increased, when the drawing hole 15 is punched by a press, the sealing material 12 hinders the punching work, and the area of the formed drawing hole 15 becomes unstable.

In the case of the ball bearing 1 according to the embodiment of the present invention configured as described above, a predetermined amount of the inside of the ball bearing 1 is passed through a throttle hole 15 formed in the core metal 11 constituting the seal ring 10. Lubricating oil is distributed. As described above, the amount of the lubricating oil flowing in the ball bearing 1 can be arbitrarily adjusted by changing the area of the throttle hole 15 or changing the number (provided of two or more). In addition, the area of the throttle hole 15 can be accurately regulated, and the area does not change even when used for a long period of time. Therefore, the amount of lubricating oil flowing while passing through the ball bearing 1 can be regulated with high accuracy over a long period of time.

As in the illustrated example, it is optional whether the seal ring 10 is locked on the outer ring 3 side or conversely, locked on the inner ring 5 side. It is optional to provide the seal ring 10 only at one end in the axial direction or at both ends. However, when the lubricating oil is provided only at one end side as in the illustrated example, the lubricating oil is used in a state of flowing from the other end side to one end side (from left to right in the drawing). When used in such a state, the pressure of the lubricating oil prevents the seal lip 14 from being strongly pressed against the inclined surface 9, thereby increasing the rotational resistance of the ball bearing 1 or preventing the seal lip 14 from rotating. The wear of the seal ring 10 can be prevented from becoming remarkable and the life of the seal ring 10 can be extended.

[0013]

Since the rolling bearing of the present invention is constructed and operates as described above, the amount of lubricating oil passing therethrough can be arbitrarily and accurately regulated without increasing the cost. For this reason, it is possible to contribute to the improvement of the performance of mechanical devices such as a belt-type continuously variable transmission and various transmissions that need to accurately regulate the flow rate of lubricating oil.

[Brief description of the drawings]

FIG. 1 is a partially enlarged sectional view showing an example of an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ball bearing 2 Outer ring raceway 3 Outer ring 4 Inner ring raceway 5 Inner ring 6 Ball 7 Cage 8 Locking groove 9 Inclined surface 10 Seal ring 11 Core metal 12 Seal material 13 Folding part 14 Seal lip 15 Draw hole

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16C 33/78 F16C 33/78 Z

Claims (1)

[Claims] 1. An outer race having an outer raceway on an inner peripheral surface, an inner racer having an inner raceway on an outer peripheral surface, and a plurality of rolling elements rotatably provided between the outer raceway and the inner raceway. In the rolling bearing provided, a ring-shaped core metal and an elastic material reinforced by the core metal are provided on any one of the inner peripheral surface at the end of the outer ring and the outer peripheral surface at the end of the inner ring. One peripheral edge of a seal ring made of a sealing material made of stainless steel is locked, and the sealing material forming the other peripheral edge of the seal ring is attached to the inner peripheral surface at the end of the outer ring and the outer peripheral surface at the end of the inner ring. While sliding on the other peripheral surface over the entire circumference,
A rolling bearing characterized in that at least one throttle hole is formed in a part of the cored bar so that both surfaces of the seal ring communicate with each other.