JP3319199B2 - Bearing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grease lubricated rolling bearing device for a rotary machine.

[0002]

2. Description of the Related Art In a rolling bearing a, a raceway surface 6 is lubricated with grease base oil. However, as shown in FIGS. 3 and 4, in the structure of a conventional grease lubricating rolling bearing device, the grease inside the bearing lids 1c and 2c is used. Since the outer diameters 1e, 2e of the pockets 1d, 2d are larger than the inner diameters 1f, 2f of the rolling bearing outer ring, the base oil (lubricating oil) released from the grease is less likely to flow into the raceway surface 6 of the rolling bearing.

When lubricating grease is replenished, old grease and excess grease must be discharged from a discharge port g.
The grease lubricated rolling bearing device is equipped with a grease lubricating roller bearing. When grease is replenished, old grease and extra grease are discharged, and even the replenished new grease is discharged too much. And the shape of the bearing lid weir j.

[0004] The bearing lids 1c and 2c block the rolling bearing a from both sides, but the grease filled in the inner grease pockets 1d and 2d of the bearing lids 1c and 2c on both sides does not move excessively. Is required in Excessive movement of grease is related to early discharge of grease, and is not good for lubrication life. In the conventional grease lubricated rolling bearing device, there is a difference in volume between the inner grease pockets 1d and 2d of the bearing lids 1c and 2c on both sides.

[0005]

In order to improve the lubrication of the raceway surface b of the rolling bearing a in grease lubrication, it is necessary to allow the base oil separated from the grease to smoothly flow into the raceway surface b of the rolling bearing.

During operation and during grease replenishment, it is necessary to prevent the grease from being discharged too early from the inner grease pockets 1d, 2d of the bearing lids 1c, 2c.

[0007] The inner grease pockets 1d, 1d of the bearing lids 1c, 2c closing the rolling bearing a from both sides, respectively.
The grease in 2d must not move too much. Excessive grease transfer causes premature grease discharge.

[0008]

The present invention solves the above problems.
To solve the problem, a bearing box that supports the rolling bearing and a bearing
A bearing lid that covers both sides of the box, and a grease holding and shaft
A grease pocket provided inside each of the receiving lids, and a shaft
Grease replenishing lubrication pad provided on one of the
Excess grease is discharged by rotation
An oil lower provided on one side of the rolling bearing,
A lid that covers the il-slower, and a lid provided on the bearing lid on the lid side.
Grease discharge hole and the outer diameter of the grease pocket.
The entire circumference or part of the entire circumference is the same as the inner diameter of the outer ring of the rolling bearing.
Set the diameter or the same inner diameter or less so that it contacts the rotating shaft.
A part that extends in the radial direction is provided in the oil
The part extending axially outward from the extended part is
Near the axially extending part of the oil thrower
To provide a bearing lid weir on the bearing lid, and axially oppose the bearing lid weir
Inclined section is provided in the oil lower, and the bearing lid dam is in the radial direction.
Inclined to protrude inward in the axial direction as going outward
Shape, with the inclined part extending in the axial direction
Inclined inward and then extended outward in the axial direction
It was configured to have the following shape.

[0009]

In order to prevent early movement of grease in the inner grease pockets 1d, 2d of the bearing lids 1c, 2c closing the rolling bearing a from both sides, the grease pockets 1d, 2d of the two sides have the same size on both sides. Set to.

[0011]

The operation of the present invention applied to the structure of the embodiment shown in FIGS. 1 and 2 will be described.

Grease pocket 1 of bearing lids 1c, 2c
By setting the entire circumference or a part of the entire circumference of the outer diameters 1e and 2e of d and 2d to be equal to or less than the inner diameters 1f and 2f of the outer ring of the rolling bearing a, the step e ″ is eliminated and the rolling is performed. The base oil separated from the grease can easily flow into the raceway surface b of the bearing a.

By providing an inclination to the oil-slower outer diameter i and the bearing lid weir j that constitute the grease outlets of the grease pockets 1d and 2d, the oil-slower h rotates and a part of the grease is pushed back.

By setting the volumes of the grease pockets 1d and 2d to the same size on both sides, the pressures inside the grease pockets 1d and 2d are balanced to the same extent.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a configuration for implementing the method according to the present invention will be described. In the prior art bearing structure shown in FIGS. 3 and 4 and the bearing structure according to the present invention shown in FIGS. 1 and 2, the load on the shaft k is supported by the rolling bearing a and the rolling bearing a is supported by the bearing box l. The bearing lids 1c and 2c close the rolling bearing a from both sides, and grease pockets 1d and 2d are provided inside the bearing lids 1c and 2c, and are filled with lubricating grease. An oil supply pipe m is provided on the side of the bearing lid 2c, and a grease discharge port g is provided. On this side, an oil thrower h for the purpose of grease discharge control is installed, and a lid n is provided outside thereof (FIG. 3 and FIG. 4 in the following description; 1 and 2 and the present invention is simply referred to as FIGS. 1 and 2).

Next, the operation according to the present invention will be described with reference to FIGS. 3, 4, and 1 and 2. FIG.

In the rolling bearing a, it is indispensable to lubricate the raceway surface b with grease base oil. In FIG. 3, the outer diameter 1 of the grease pockets 1d and 2d is reduced.
Since e and 2e are larger than the inner diameters 1f and 2f of the outer ring of the rolling bearing a and have a step e ', the base oil of the grease hardly flows into the track guide surface b and the base oil of the grease is not effectively used.

1 and 2, grease pockets 1d, 2
The entire circumference of the outer diameters 1e and 2e of d or a part of the entire circumference is set to the same diameter (e ′ = 0) as the inner diameter 1f and 2f of the outer ring of the rolling bearing or an inverse step e ″ equal to or less than the same diameter (here, FIGS. FIG. 2 shows an embodiment in which a part of the entire circumference has the same diameter.) By doing so, the base oil of the grease can be positively introduced into the track surface b, and the base oil can be effectively used.

In order to effectively use the grease in the grease pockets 1d and 2d, it is necessary to prevent excessive discharge of the grease. In FIG. 3, the grease that has moved to this position is carried to the discharge gap o by the rotating oil thrower h because the bearing lid weir j and the surface of the oil lower outer diameter i opposed thereto are parallel to each other. The grease is discharged from the grease discharge port g, and the grease is discharged too much. In FIG. 1, the bearing lid weir j is provided with an inclination as shown in the figure, and the surface of the oil lower outer diameter i opposite thereto is also provided with an inclination as shown in the figure. Bearing cover weir j that faces the slope of the outer diameter i of the oil lower that rotates part of the grease
By generating an effect of pushing back inside due to the inclination of, excessive discharge of grease can be suppressed.

The grease moves from the grease pocket 1d to the grease pocket 2b by lubricating the rolling bearing a and is discharged. In FIG. 3, the volume of the grease pockets 1d and 2d is 1d> 2d. Therefore, the internal pressure of the grease pockets 1d and 2d becomes unbalanced, and the grease moves from the grease pocket 1d to the grease pocket 2d side early. Therefore, this structure promotes the early discharge of grease.

In FIG. 1, the size of the volume of the grease pockets 1d and 2d is set to 1d = 2d. Therefore, the internal pressure of the grease pockets 1d and 2d is balanced, so that the grease is prevented from moving early from the grease pocket 1d to the grease pocket 2d side, that is, the grease can be prevented from being discharged early.

In FIG. 1 and FIG.
The entire circumference or a part of the entire circumference of the outer diameters 1e and 2e of d and 2d is the same as the inner diameter 1f and 2f of the outer ring of the rolling bearing (e '= 0).
Alternatively, the reverse step e ″ having the same diameter or less allows the grease base oil to be positively introduced into the raceway surface b of the rolling bearing a, which has the effect of reducing the running noise of the rolling bearing a and extending the grease lubrication life. is there.

In FIG. 1, a part of the grease to be discharged with the inclined slope of the bearing cover weir j and the outer diameter i of the oil slower opposed thereto is pushed back by the rotation of the oil thrower h to suppress excessive discharge of the grease. It is effective for extending the grease lubrication life.

In FIG. 1, the size of the inner volume of the grease pockets 1d and 2d of the bearing lids 1c and 2c is represented by 1d = 2d.
By setting to, the internal pressures of the grease pockets 1d and 2d are balanced, so that the early movement of the grease from the grease pocket 1d to the 2d side can be suppressed, and the early discharge of the grease can be suppressed. There is.

Although the above description has been made with reference to the example of a cylindrical roller bearing, the same can be said for a ball bearing.

[0026]

According to the present invention, the entire circumference or a part of the outer diameter of the grease pocket of the bearing lid is set to be equal to or less than the inner diameter of the rolling bearing outer ring, and the base oil of the lubricating grease is used for the rolling bearing. By adopting a structure that is positively introduced into the track surface, the rolling noise of the rolling bearing can be reduced by 2-3.
It is possible to reduce dB, and the grease lubrication life can be expected to be extended by about twice.

Further, by providing a grease return inclination at the outer diameter of the oil lower facing the bearing lid weir, it is possible to suppress excessive grease discharge by the effect of grease pushing back by rotation of the oil slower, thereby prolonging the grease lubrication life. There is.

Further, by setting the grease pocket volumes of the bearing caps on both sides to be the same, the internal pressure of the grease pocket is balanced and the early movement of the grease can be suppressed. As a result, the grease lubrication life can be extended.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of a bearing structure according to the present invention.

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a cross-sectional view of a conventional bearing structure.

FIG. 4 is a side view of FIG. 3;

[Explanation of symbols]

a: rolling bearing, b: track surface, 1c, 2c: bearing lid,
1d, 2d: grease pocket, 1e, 2e: grease pocket outer diameter, e ': grease pocket outer diameter, step with the inner diameter of the bearing outer ring, e "... reverse step of e', 1f: inner diameter of the rolling bearing outer ring, g ... Grease outlet, h: oil slower, i: outer diameter of oil lower, j: bearing lid weir, k
... shaft, l ... bearing box, m ... oil supply pipe, n ... lid, o ... grease discharge clearance.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-71246 (JP, A) JP-A-55-69858 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16C 33/66 H02K 5/173

Claims (3)

(57) [Claims] 1. A bearing box for supporting a rolling bearing, a bearing cover for closing both sides of the bearing box, a grease pocket holding grease and provided inside each of the bearing covers, and one of the bearing covers. A grease supply oil supply pipe provided on one side, an oil thrower provided on one side of the rolling bearing while discharging excess grease by rotation, a lid covering the oil thrower, and the bearing lid on the lid side. In the bearing device having a grease discharge hole provided, the entire circumference or a part of the entire outer diameter of the grease pocket is set to be equal to or less than the inner diameter of the outer ring of the rolling bearing, and the rotation shaft and Extend radially to make contact
Is provided in the oil thrower and extends in the radial direction.
The part extending axially outward from the part
At the part extending in the axial direction of the oil thrower.
Providing a bearing lid weir in proximity to the bearing lid,
An inclined portion facing the axial direction is provided in the oil thrower,
The bearing lid weir moves axially inward as it goes radially outward.
It is inclined so that it protrudes, and the inclined part is radial.
Is it inclined so that it goes down in the axial direction as it goes to the outside?
A bearing device having a shape following the portion extending outward in the axial direction from the bearing device. 2. The bearing device according to claim 1, wherein the grease pocket on the oil lower side has a grease outlet, and the grease outlet is inclined. 3. The bearing device according to claim 1, wherein the volume of the grease pocket provided inside each of the bearing lids is the same.