JPH08540Y2 - Air bleeding structure for rotating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to an air bleeding structure for rotary equipment such as a vane pump.

2. Description of the Related Art Generally, a rotating device is configured such that a rotating shaft is inserted into a housing and supported by a bearing, and a seal ring that contacts the rotating shaft is provided between the inside of the housing and the bearing (actual opening). (See Sho 60-155790).

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in such a conventional example, at the time of assembly, the bearing was assembled to the rotary shaft by press-fitting the inner ring of the bearing into the rotary shaft in advance. On the other hand, the seal ring is assembled in the housing, and the rotary shaft is inserted into the seal ring, and at the same time, the outer ring of the bearing is assembled in the housing.
Therefore, a sealed space is formed between the seal ring and the bearing during assembly, and the internal pressure of the sealed space gradually increases as the bearing is inserted. Due to the internal pressure of the sealed space, each of the seals provided on the seal ring or the bearing is sealed. There is a problem in that the lip portion is reversed and the sealing performance is impaired, and eventually the durability of the entire rotating device such as a pump is impaired.

Means for Solving the Problems Therefore, the present invention has been made to solve the problems of the above-mentioned conventional techniques.

That is, the rotary shaft is rotatably fitted into the shaft hole of the housing through the bearing, and the seal ring for sealing between the rotary shaft and the shaft hole of the housing is arranged inside the bearing with a predetermined axial gap. In the installed rotating equipment,
An air vent groove is provided between the bearing and the rotary shaft to communicate the axial gap with the external space of the housing, and a nut for fixing the bearing is screwed to the tip of the rotary shaft via a seal washer. In addition, the air vent groove is closed by a seal washer.

As a result of the present invention having the above-mentioned characteristic structure, the seal ring is previously attached to the shaft hole of the housing, the rotary shaft on which the bearing is fitted is inserted into the seal ring, and the rotary shaft is attached to the shaft hole through the bearing. At this time, since the air in the axial gap between the bearing and the seal ring is discharged to the outside of the housing, the inversion of the seal lip due to the pressure in the axial gap is prevented. Moreover, when the nut is tightened through the seal washer previously attached to the tip of the rotary shaft after inserting the rotary shaft as described above, the bearing is fixed at a predetermined position on the inner peripheral surface of the shaft hole, and The seal washer closes one end opening of the air bleed groove to block communication between the axial gap and the external space of the housing.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, reference numeral 1 is a housing, and a shaft hole 2 is formed through the housing 1. At one opening end of the shaft hole 2, a seal mounting portion 3 is stepped and a bearing receiving portion 4 is stepped outside the seal mounting portion 3. A seal ring 7 having seal lips 5 and 6 on the inner peripheral side is fitted and fixed to the seal mounting portion 3. On the other hand, the rotary shaft 8 inserted through the shaft hole 2
The bearing mounting portion 9 is formed in a stepped manner, and the inner race 10a of the bearing 10 is fitted and fixed thereto. Then, the rotary shaft 8 with the bearing 10 fixed in the shaft hole 2 of the housing 1 in which the seal ring 7 is fitted and fixed in advance.
And the outer periphery of the rotary shaft 8 is slidably attached to the seal lips 5 and 6 of the seal ring 7, and the outer race 10b of the bearing 10 is attached to the bearing receiving portion 4. As a result, the rotary shaft 8 is rotatably attached to the housing 1. 11 is the axial gap,
The axial gap 11 is set to a predetermined amount between the seal ring 7 and the bearing 10 in order to prevent the seal lip 6 of the seal ring 7 and the bearing 10 from interfering with each other. Reference numeral 12 denotes an air vent groove formed on the rotary shaft 8. The air vent groove 12 is formed continuously with the shoulder portion 9a and the axial portion 9b of the bearing mounting portion 9. The air vent groove 12 allows the axial gap 11 and the outer space 13 of the housing 1 to be closed.
And are in communication. Therefore, the rotary shaft 8 is the housing 1
The air in the axial gap 11 passes through the air bleeding groove 12 and is discharged to the external space 13 of the housing 1 when it is assembled to the seal lip 6 due to the pressure increase in the axial gap 11. And the like are prevented.

After the rotary shaft 8 is rotatably assembled to the housing 1 as described above, the driven pulley 14 is externally fitted to the rotary shaft 8, and the boss portion 15 of the driven pulley 14 is attached to the inner race 10a of the bearing 10. Is fastened and fixed to the end face of the sheet by a nut 17 via a seal washer 16. This seal washer
The nut 16 and the nut 17 also have a function of closing the air bleeding groove 12, and by tightening the nut 17, a clearance in the axial direction is provided.
The communication between 11 and the external space 13 of the housing 1 is cut off. As a result, foreign matter such as water and dust can be reliably prevented from entering the axial gap 11 from the outside 13 of the housing 1, and the durability of the seal ring 7 can be improved.

Further, since the seal washer 16 has both the function unique to the washer and the function as the closing member for the air vent groove 12, it is not necessary to separately prepare a member for closing the air vent groove 12. Therefore, the increase in the number of parts is suppressed,
It is possible to prevent a decrease in manufacturing work efficiency and a rise in cost.

The air vent groove 12 may be formed in the inner race 10a of the bearing 10, as shown in FIGS.
It may be provided on both the inner race 10a and the rotary shaft 8.

In addition, although the above embodiments have been described by taking the vane pump as an example, the present invention is not limited to this, and it is needless to say that the present invention can be widely applied to other rotary devices.

Effect of the Invention As described above, according to the present invention, the air vent groove is formed between the bearing and the rotary shaft so as to connect the axial gap formed between the bearing and the seal ring and the external space of the housing. Therefore, when the rotary shaft is assembled in the shaft hole of the housing, it is possible to prevent the seal lip from reversing due to the pressure increase in the axial gap between the bearing and the seal ring, and further improve the sealing performance. Can be made. Moreover, since the air vent groove is closed by the seal washer, it is possible to reliably prevent foreign matter such as water and dust from entering the axial space from the outer space of the housing, and further improve the durability of the seal ring. be able to.

Further, since the seal washer has both the unique function of the washer and the function of closing the air vent groove as described above, it is not necessary to separately prepare a member for closing the air vent groove.
Therefore, an increase in the number of parts can be suppressed, and a decrease in manufacturing work efficiency and a cost increase can be prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of a rotary machine (vane pump) showing an embodiment of the present invention, FIG. 2 is a sectional view of a main part of a rotary machine showing the other embodiment, and FIG. 3 is a further embodiment. It is a principal part sectional view of the rotating apparatus shown. 1 ... Housing, 2 ... Shaft hole, 7 ... Seal ring,
8 ... Rotary shaft, 10 ... Bearing, 11 ... Axial gap,
12 …… Air vent groove, 13 …… External space, 16 …… Seal washer, 17 …… Nut.

Claims (1)

[Scope of utility model registration request] 1. A rotary shaft is rotatably fitted into a shaft hole of a housing through a bearing, and a seal ring for sealing between the rotary shaft and the shaft hole of the housing has a predetermined axial direction inside the bearing. In a rotating device arranged with a gap, an air vent groove is provided between the bearing and the rotary shaft to connect the axial gap and the external space of the housing, and a nut for fixing the bearing is inserted through a seal washer. An air bleeding structure for a rotating device, characterized in that the air bleeding groove is screwed to the tip of the rotary shaft and the air bleeding groove is closed by the seal washer.