JPH0725333U - Rolling bearing lubrication structure - Google Patents

Abstract

(57) [Abstract] [Purpose] In a lubrication structure of a rolling bearing in which a chock having an oil supply passage is interposed between the rolling bearing and the lubricating oil supply device, regardless of how the chock is attached, Hold the oil level in place in place. [Structure] The rollers 2 are provided on both sides of the outer ring 22 of the double-row roller bearing 2.
A shield 23 having an inner peripheral surface having a cross section equal to the pitch circle of No. 5 was provided. As a result, the lowermost position L ₁ of the inner peripheral surface of the shield 23 is the lowermost position L of the pitch circle of the rollers 25.
Is equal to Further, the chock 3 is provided with an oil supply passage K and an oil discharge passage H.
Was set up. The oil discharge passage H of this chock 3 is connected to the shield 23.
Is formed so as to have the open ends H ₁ and H ₄ on the lower side of the lowermost position L ₁ on the inner peripheral surface. Therefore, the shield 23 holds the oil level in the bearing 2 at the lowest position L of the pitch circle of the rollers 25.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lubricating structure for supplying lubricating oil to a rolling bearing that supports a rotating shaft of a roll in continuous casting equipment, hot / cold rolling equipment, and the like.

[0002]

[Prior art]

Conventionally, for rolls such as continuous casting equipment and hot / cold rolling equipment, as shown in FIG. 3, the outer ring 22 of the double-row roller bearing 2 that supports the rotating shaft 11 of the roll 1 is formed into a cylindrical chuck 3. The lubricating oil supply device is connected to the oil supply port K ₀ provided in the upper part of the chock 3 and the lubricating oil is introduced from the oil supply passage K to supply the lubricating oil into the bearing 2.

The chock 3 includes a main body 31 having an inner peripheral surface into which the outer ring 22 of the bearing 2 is fitted, and a chock cover 32 that closes the opening of the main body 31 from the tip side of the shaft. An oil drain port H ₀ is provided at a predetermined height below the chock cover 32 so that the oil level in the lower part of the bearing 2 is maintained at an appropriate position, for example, the lowest position L of the pitch circle of the roller 25. There is.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned conventional method, even if the mounting position of the chock body on the rolling bearing is slightly displaced, the position of the chock cover with respect to the rolling bearing is changed. There was a problem that it was not retained. Also, if a gap is created between the chock cover and the chock body due to improper mounting, the lubricating oil in the chock may leak to the outside and the required oil level may not be maintained, resulting in insufficient lubrication in the rolling bearing. was there.

The present invention has been made in view of such unsolved problems of the prior art, and keeps the oil level in the rolling bearing at a predetermined position regardless of the attachment state of the chock body and the chock cover. It is intended to provide a lubrication structure for rolling bearings.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, according to the present invention, an outer ring of the rolling bearing is fitted in between a rolling bearing having an oil hole in the outer ring and a lubricating oil supply device, and an inner ring of the rolling bearing is fitted. In a lubrication structure of a rolling bearing in which a chock having an oil supply passage communicating with the oil hole is provided to cover the end portion of the shaft, the rolling elements forming the rolling bearing are provided on both sides of the outer ring of the rolling bearing. In addition to providing a shield with an inner peripheral surface whose cross section is a circle that is equal or nearly equal to the pitch circle of, the chock is provided with an oil discharge passage having an opening end below the lowermost position of the inner peripheral surface of the shield. A lubrication structure for rolling bearings is provided.

[0007]

[Action]

 According to the present invention, the oil level in the bearing is maintained at the lowest position of the inner peripheral surface of the shield by the shields provided on both sides of the outer ring of the rolling bearing. Since the cross section is a circle that is equal to or nearly equal to the pitch circle of the rolling element, the oil level in the bearing is maintained at or near the lowest position of the pitch circle of the rolling element without being affected by the chock mounting condition. To be done. As a result, half or almost half of the rolling element at the lowest position is immersed in the lubricating oil, so that a sufficient amount of lubricating oil is distributed in the rolling bearing. Further, the lubricating oil overflowing from this shield is quickly discharged to the outside from the oil discharge passage provided in the chock.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing an embodiment of the present invention, which relates to a lubrication structure for a roller bearing that supports the end of a rotary shaft of a roll. As can be seen from FIG. 1, the end of the rotary shaft 11 of the roll 1 is fitted in the inner ring 21 of the double row roller bearing 2, and the snap ring 21a is attached to the tip thereof. A shield groove 22a and a ring groove 22b are provided on the groove side surface of the outer ring 22 of the bearing 2, and the shield groove 22a is an annular body having a hole concentric with the outer circumference circle of the disk at the center of the disk. The shield 23 is made of a metal and the shield groove 24 is attached to the ring groove 22b.

Since the cross section of the inner peripheral surface of the shield 23 is formed into a circle equal to the pitch circle of the roller 25, the lowest position L ₁ of the inner peripheral surface of the shield 23 is the pitch of the roller 25 in the mounted state. It coincides with the lowest position L of the circle. An oil hole 22c that penetrates from the outer peripheral surface to the raceway groove surface is provided at a predetermined position in the widthwise central portion of the outer ring 22, and an oil groove having a width larger than the diameter of the oil hole 22c is provided on the outer peripheral surface side. 22d is provided.

The end of the rotary shaft 11 is also covered with a chock 3 into which the outer ring 22 of the bearing 2 is fitted. This chock 3 is a main body composed of a thick cylindrical body 31 having a bearing seat 31a into which the outer ring 22 of the bearing 2 is fitted and a shoulder 31b for positioning the outer ring 22 of the bearing 2 in the axial direction on the inner peripheral surface. , And a chock cover 32 that closes one end (opening 31c) in the axial direction of the inner peripheral surface of the cylindrical body 31.

A through hole K ₁ penetrating at a right angle from the outer peripheral surface to the inner peripheral surface is opened at a predetermined position in a portion on the upper side in the mounted state of the cylindrical body 31 which constitutes the main body, and is straight from the end surface on the opening 31c side. A hole K ₂ reaching the through hole K _{1 is formed} at a corner, and the outer peripheral surface side of the through hole K ₁ is closed with a plug S ₁ . Here, the through hole K ₁ is provided at a position communicating with the oil hole 22c of the bearing outer ring 22 in the mounted state.

In the lower portion of the tubular body 31 in the attached state, a tapered surface 31 d is tapered from the end of the shoulder 31 b on the inner peripheral surface to a predetermined depth from the inner peripheral surface toward the outer peripheral surface. H₁And open the hole H at a right angle from the end face on the opening 31c side.₁Hole H reaching ₂ Through the through hole H on the inner peripheral surface on the side of the opening 31c and penetrating at a right angle from the inner peripheral surface to the outer peripheral surface.₃Open the through hole H₃The outer peripheral surface of the plug S₂Is closed by.

The chock cover 32 has a shape in which a ring-shaped projection 32b that is externally fitted to the opening 31c of the inner peripheral surface of the cylindrical body 31 is provided on one surface of a disk 32a having an outer diameter equal to that of the cylindrical body 31. The through holes K ₀ and H ₀ communicating with the holes K ₂ and H ₂ formed in the cylindrical body 31 are opened at two diametrically opposite edges of the disc 32a, and the protrusions Female threads K _N and H _N to which the male threads of the oil supply pipe (not shown) of the lubricating oil supply device (oil-air lubrication device) J and the plug of the oil discharge pipe 4 are respectively screwed are provided on the side opposite to the surface on which the raising 32b is located. Provided. In FIG. 1, the plug of the oil drain pipe 4 is shown by reference numeral 4a and the male screw is shown by reference numeral 4b, but the plug of the oil supply pipe and the male screw are not shown.

In the vicinity of the through hole H _{0 of the} ring forming the protrusion 32b, a through hole H ₄ penetrating from the inner peripheral surface to the outer peripheral surface is provided. The through hole H ₄ communicates with the through hole H ₃ of the tubular body 31 forming the chock body in the attached state. Further, the gap between the cylinder body 31 forming the chock body and the chock cover 32 is sealed by the gasket 5, and this gasket 5 also communicates with the holes K ₂ and H ₂ formed in the cylinder body 31, respectively. Through holes K ₅ and H ₅ are provided.

As a result, the holes K formed in the chock body (cylindrical body) 31, the chock cover 32, and the gasket 5 in the mounted state.₀, K_Five, K₂, K₁ Are communicated with each other, and an oil supply passage K is formed in a portion on the upper side of the chock 3, and the oil supply passage K and the oil hole 22c of the bearing 2 are communicated with each other. Similarly, each hole H in the attached state₀, H _Five , H₃, H_Four, H₂, H₁To the lower side of the chock 3 at the opening end (hole H) of the pitch circle of the wheel 25.₁, H_FourOf the oil is formed.

On the other hand, a corner portion 31e is formed on the inner peripheral surface of the end surface side of the cylindrical body 31 arranged on the roll 1 side, and the metal ring 6a of the oil seal 6 is fixed to the corner portion 31e. is there. Further, an end member 7 surrounding the rotary shaft 11 is fixed to the end face with a slight gap. A column 8 is provided between the chock cover 32 and the bearing 2.

In the lubrication structure of the double-row roller bearing 2 configured as described above, the oil pressure-fed by the compressed oil from the lubricating oil supply device (oil air lubrication device) J passes through the oil supply passage K of the chock 3 to the bearing. The oil is supplied into the bearing 2 from the oil hole 22c of the outer ring 22. The oil supplied into the bearing 2 reaches the raceway surface of the outer ring 22, the rolling surface of the rollers 25, and the inner ring 21 to exert a lubricating action. Since the oil is continuously supplied from the lubricating oil supply device J, it will be accumulated in the lower part of the bearing 2 by gravity, and the lowest position L ₁ of the inner peripheral surface of the shield 23 (the lowest position of the pitch circle of the rollers 25 will be described). The part that exceeds (the same position as L) overflows and moves into the chock 3 and then enters the oil discharge passage H from the opening ends (upper ends of the holes H ₁ and H ₄ ) and is discharged to the outside via the oil discharge pipe 4. Then, a part thereof is discharged to the outside from the lip 6b of the oil seal 6 through the space between the rotary shaft 11 and the end member 7 by compressed air.

Therefore, the oil level in the bearing 2 is held at the lowest position L of the pitch circle of the rollers 25 by the shield 23 without being affected by the mounting state of the chock 3. As a result, half of the rollers 25 at the lowest position are immersed in the lubricating oil, so that a sufficient amount of the lubricating oil is distributed in the bearing 2 and the bearing 2 is sufficiently lubricated. Further, since the chock 3 is provided with the oil discharge passage H, the overflowed oil is promptly discharged to the outside.

The shield according to the present invention is not limited to the ring body as in the above-mentioned embodiment, and as shown in FIG. 2, the width of the ring body is increased so that the outer circumference circle of the disk is formed on the surface of the ring body. Alternatively, an arc hole 123a may be provided, which is formed in a state of being equally divided in the circumferential direction with a predetermined width by an arc of a concentric circle. In this shield 123, the lowest position L _{2 on} the outer peripheral side surface of the arc hole 123a becomes the overflow level (that is, the outer peripheral side surface of the arc hole 123a corresponds to the inner peripheral surface of the shield of the present invention). The circle forming the outer peripheral side surface of 123a is equal to or substantially equal to the pitch circle of the rolling element.

[0020]

[Effect of device]

 As described above, according to the present invention, in the lubrication structure of the rolling bearing in which the chock is interposed between the rolling bearing and the lubricating oil supply device, the rolling bearing inside is not affected by the mounting state of the chock. The oil level can be maintained at a position where sufficient lubrication is performed, and the lubricating oil overflowing from the shield can be quickly discharged to the outside from the oil discharge passage provided in the chock. As a result, the lubrication inside the rolling bearing is always effectively performed, so that the reliability of mechanical equipment provided with this lubrication structure can be improved.

[Brief description of drawings]

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

FIG. 2 is a sectional view showing an example of a shield used in the present invention.

FIG. 3 is a cross-sectional view showing a conventional example of a lubrication structure for a rolling bearing having a chock interposed therebetween.

[Explanation of symbols]

 11 Rotating Shaft 2 Double Row Roller Bearing (Rolling Bearing) 21 Inner Ring 22 Outer Ring 22c Oil Hole 23 Shield 123 Shield 25 Roller (Rolling Element) 3 Chock K Oil Supply Path H Oil Discharge Path J Lubricating Oil Supply Device

Claims (1)

[Scope of utility model registration request] 1. An outer ring of the rolling bearing is internally fitted between a rolling bearing having an oil hole in the outer ring and a lubricating oil supply device, and an inner ring of the rolling bearing covers an end portion of the outer fitted shaft. In a lubrication structure of a rolling bearing in which a chock having an oil supply passage communicating with the oil hole is interposed, on both sides of the outer ring of the rolling bearing, a pitch circle of rolling elements constituting the rolling bearing is equal to or almost equal to In addition to providing a shield having an inner peripheral surface having an equal circle cross section, the chock is provided with an oil discharge passage having an opening end below a lowermost position of the inner peripheral surface of the shield. Bearing lubrication structure.