JPH0439512Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a grease replenishment type bearing device that efficiently supplies new grease to a bearing portion and reliably discharges waste grease.

[Conventional technology]

A conventional example of a grease-replenishable bearing device will be explained based on FIG. 3. In this figure, a rotating shaft 1 is supported by a bracket 3 via a bearing 2, and the end face of the bearing 2 is surrounded by an end cover 4 and an inner bearing cover 5, which are integrally molded with the bracket 3. The inner periphery of the end surface of the end cover 4 that comes into contact with the end surface of the outer ring of the bearing 2 is formed to have approximately the same diameter as the inner periphery of the outer ring, and an annular cavity 6 is formed inside the center of the end cover 4. The end cover 4 is provided with a grease supply path 7 that communicates the outer periphery with the space 6.
and a discharge passage 8 for the waste grease that has lubricated the bearing 2 are provided in the radial direction, and a grease nipple 9 and a plug 10 are screwed into the tips of the supply passage 7 and the discharge passage 8, respectively. The bearing 2 is shielded only on the side opposite to the end cover 4, and the grease supplied through the grease nipple 9 and supply path 7 during operation is drawn into the bearing 2 from the end cover 4 side. After the waste grease that has lubricated the bearing 2 is collected in the space 6, the plug 10 is appropriately removed and scraped out to be discharged.

Also, as another conventional example, for example, Utility Model Application No. 48-5136
In the bearing device described in the publication, an annular space is provided on the bearing facing surface of the end cover, and this space is divided into an annular inner circumferential space and an annular outer circumferential space by a partition plate made of annular projections. The inner circumferential space communicates with the supply path, and the outer circumferential space communicates with the discharge path. In this configuration, the grease press-fitted from the supply path is press-fitted into the bearing from the inner peripheral space, passes through the inside of the bearing, passes through the outer peripheral space, and is discharged from the discharge path.

[The problem that the idea aims to solve]

By the way, in the structure of the bearing device shown in FIG. 3, which is the former of the above-mentioned conventional examples, a part of the fresh grease supplied may be directly introduced into the discharge passage 8 through the cavity 6, so that the bearing device It is difficult to efficiently replenish new grease to the second part, and the waste grease cannot be reliably discharged. Furthermore, when the bearing device is used with a vertical shaft with the end cover 4 facing downward, it is difficult to draw new grease upward into the bearing 2, and furthermore, rolling elements are inserted into the end face of the bearing 2. Since the portion between the inner ring and the outer ring faces the annular space 6 of the end cover 4 over the entire circumference, the grease drawn into the bearing 2 also liquefies due to frictional heat during operation. Since the bearing falls into the annular space 6 and separates from the bearing 2, there is a drawback that the lubricity of the bearing is significantly deteriorated.

On the other hand, in the case of the latter bearing device described in Japanese Utility Model Application Publication No. 48-5136, the grease press-fitted from the supply path is press-fitted into the bearing from the inner circumferential space and passes through the inside of the bearing. Since the grease is discharged from the discharge passage through the outer peripheral space, the supplied grease is prevented from being directly introduced into the discharge passage without passing through the bearing, and new grease can be efficiently replenished to the bearing. However, even in this latter case, the portion of the bearing end face between the inner ring and the outer ring in which the rolling elements are inserted faces the annular inner and outer spaces, respectively, over the entire circumference. When the bearing device is used with a vertical shaft type, the grease inside the bearing falls into both annular spaces due to its own weight, as in the former case shown in Fig. 3, so the lubricity of the bearing when used with a vertical shaft type is reduced. It is not possible to eliminate the drawback that it becomes worse.

Therefore, we devised a new grease that allows new grease to be efficiently supplied to the bearing and waste grease to be reliably discharged, and that also maintains the lubricity of the bearing even when used in a vertical shaft type. The purpose of the present invention is to provide a replenishment type bearing device.

[Means to solve the problem]

In order to achieve such an object, this invention provides a bearing device in which a grease supply path and a waste grease discharge path for lubricating the bearing are provided in the end cover surrounding the end face of the bearing in the radial direction. , A circular recess with a diameter slightly larger than the outer circumference of the inner ring of the bearing is provided around the rotating shaft through hole on the end face of the end cover that is brought into contact with the end face of the outer ring of the bearing, and the end cover that faces the rolling elements of the bearing in the axial direction is provided. A replenishment port and a discharge port that communicate with the replenishment path and the discharge path, respectively, are provided at a portion located on the circumference of the end face and diametrically opposed to each other across the rotating shaft, and between the replenishment port and the discharge port. It is characterized by covering the end face of the bearing with an extending wide end cover end face.

[Action]

According to the bearing device of this invention based on the above means, the end face of the bearing 2 is the end of the part between the inner ring and the outer ring in which the rolling elements are inserted, excluding the recesses of the supply port 19 and the discharge port 20. Since it is closed by the end face of the lid 14, almost all the grease supplied from the supply channel 17 is drawn into the bearing 2. Furthermore, due to the above-mentioned closure, even if the bearing is used in a vertical shaft type, the grease will not leak out. It remains inside the bearing and maintains lubricity.

〔Example〕

Figure 1 shows an embodiment of this invention;
Components indicated by the same reference numerals as those in the figures are the same parts. In this figure, an end cover 1 that comes into contact with the end surface of the outer ring of the bearing 2
The end face of the bearing 2 is designed so that even if thrust play occurs on the rotating shaft 1, it will not come into contact with the inner ring of the bearing 2 and prevent the grease inside the bearing 2 from leaking.
A circular recess with a diameter slightly larger than the outer circumference of the inner ring of the bearing 2 is provided around the rotating shaft through hole in the end face of the end cover 14 that is brought into contact with the end face of the outer ring of the bearing 2. An annular cavity 16 is formed between the shaft 1 and the shaft 1 . By providing the circular recess with a diameter slightly larger than the outer circumference of the inner ring of the bearing 2 on the end cover end face, the bearing end face is substantially tightly closed by the end cover end face, while the thrust play of the rotating shaft 1 is increased. Even if the bearing 2 moves in the axial direction of the rotating shaft 1, the bearing 2 can be received by the space 16, and as a result, the bearing inner ring can be prevented from colliding with the end cover end surface. A replenishment port 19 is provided on the end surface of the end cover 14 facing the rolling elements of the bearing 2 in the axial direction, and communicates with a grease replenishment path 17 and a waste grease discharge path 18, respectively, which are provided in the radial direction from the outer periphery.
As shown in FIG. 2, a discharge port 20 is recessed in a part of the circumference of the end face of the end cover, and a notch is formed on the side of the space 16 of the discharge port 20.
As shown in FIG. 2, the supply port 19 and the discharge port 20 are located diametrically opposite to each other with the rotating shaft 1 in between, and are formed only in a portion of the circumference of the end face of the end cover. Not yet. As a result, there are wide end cover end surfaces 14a and 14 between the supply port 19 and the discharge port 20.
b comes to be extended and formed. However,
The end face of the bearing 2 has a wide end face 14a, 14 of the end cover 14, which extends between the inner ring and the outer ring in which the rolling elements are inserted, and extends between the supply port 19 and the discharge port 20.
It becomes occluded by b. Therefore, even if the bearing is used with a vertical shaft, the supplied grease remains within the bearing 2 and lubricity is maintained. Supply route 17
The grease nipple 9 is pushed toward the rolling elements of the bearing 2 from the grease nipple 9 attached to the tip of the bearing. The waste grease that has lubricated the bearing 2 is pushed out from the discharge port 20 into the discharge passage 18 by the supplied new grease, and this waste grease is passed through the plug 1 attached to the tip of the discharge passage 18.
0 is removed and scraped out as appropriate. Note that the end cover 14 can be formed not integrally with the bracket 3 but as a separate body.

[Effect of idea]

According to this invention, a circular recess having a diameter slightly larger than the outer circumference of the inner ring of the bearing 2 is provided around the rotating shaft through hole in the end face of the end cover that is brought into contact with the end face of the outer ring of the bearing 2. A replenishment port 19 and a discharge port that communicate with the replenishment passage 17 and the discharge passage 18, respectively, are located on the circumference of the end face of the end cap and are diametrically opposed to each other with the rotating shaft in between. 20 is provided, and a supply port 19 and a discharge port 20 are provided.
wide end cover end surfaces 14a, 14b extending between
Since the end face of the bearing 2 is covered with the oil, new grease can be efficiently replenished and waste grease can be discharged reliably.Furthermore, even when used with a vertical shaft, the grease stays inside the bearing to maintain lubricity. Since it can be maintained, an effect can be obtained in that it can be used in common for both vertical and horizontal axes.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment of this invention, FIG. 2 is a longitudinal sectional view taken along the - line in FIG. 1, and FIG. 3 is a longitudinal sectional view of a conventional example. 2... bearing, 14... end plate, 17... supply path,
18...Discharge channel, 19...Replenishment port, 20...Discharge port.

Claims (1)

[Claims for Utility Model Registration] In a bearing device in which an end cover 14 surrounding an end face of a bearing 2 is provided with a grease supply path 17 and a waste grease discharge path 18 that lubricates the bearing 2, respectively, in the radial direction. , A circular recess having a diameter slightly larger than the outer circumference of the inner ring of the bearing 2 is provided around the rotating shaft through hole in the end face of the end cover that is brought into contact with the end face of the outer ring of the bearing 2, and the rolling element of the bearing 2 and the shaft are provided. The supply path 17 is located at a portion of the circumference of the end cover end faces facing each other in the direction and diametrically opposite to each other with the rotating shaft in between.
and a supply port 19 communicating with the discharge passage 18, respectively.
and a discharge port 20, and the bearing 2 is provided at the wide end cover end surfaces 14a and 14b extending between the supply port 19 and the discharge port 20.
A grease-replenishable bearing device characterized by covering an end face of.