JPS6234967B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for supplying air to a rotating body, and more particularly to a device for supplying air to a pneumatic mechanical device such as an air clutch.

As such an air supply device, the devices described in Japanese Patent Publication No. 47-20522 and Japanese Patent Publication No. 46583-1983 (hereinafter referred to as known examples) previously submitted by the applicant have been used.
In addition to these known examples, there have also been conventionally used devices that supply hydraulic pressure to seal air.

The present invention solves various drawbacks of these known and conventional air supply devices, and in particular, not only improves the airtightness of the air, but also makes the air supply method stable and easy, and has a simple structure and durability. The purpose of this invention is to obtain an air supply device with excellent performance.

The known and conventional examples described above are shown in FIGS. 1 and 2.

FIG. 1 shows an air supply device typified by a known example.

A is an air machine, an air clutch in the figure, and is connected to an air supply device B by a pipe C. Usually, the air clutch A has a tube A3 fixed to a rim A1 which is rotatably connected to the rotating shaft 2, and by supplying air to the tube A3, the tube A3
expands, bringing the shoe A4 into pressure contact with the drum A5 and transmitting the rotation of the rotary shaft 2 to the output shaft A2.
Therefore, an air supply device B is required to supply air to the rotating shaft 2 or the rim A1, and the air supply device is required to meet the following conditions.

In other words, do not leak the equipment supplied from the outside. When supplying and sealing air into the tube, the pressure must be maintained constant. The durability of moving parts should be maintained for a long time. Prevent foreign matter from entering the air. etc. are mentioned.

In the exhalation example shown in FIG. 1, the air supply device supplies air to the piping C via the sealing and operating pressure air supply piston B6 in the case 3 and through the check valve B2. Further, exhaust is performed by operating a check valve operating piston B7. Furthermore, a pressure detector 20 and a non-contact switch 22 are used to keep the air pressure constant. In the known air supply device shown in FIG. 1, carbon B13 is attached to the sliding part of the piston B7.
, and there is a lot of wear due to long-term use.
Furthermore, since the air passages are complicated, it is difficult to discover the leakage portion when air leakage occurs. Furthermore, the adjustment of the pressure detector 20 is delicate, it is necessary to maintain the resupply pressure appropriately high with respect to the confinement pressure, and precise pressure settings are required. , which required a high degree of coordination. In addition, the reducing valve is easily clogged with foreign matter and its operation is obstructed, requiring careful maintenance of the device.

On the other hand, as an air supply device, an airtight device using hydraulic pressure as shown in FIG. 2 has also been used. In this air supply device, a sleeve 23 is fixed to the rotating shaft 2, an air chamber 5 is provided on both sides of the air supply hole 21 provided in the case 3 in the axial direction, and an oil seal 90 is provided outside the air chamber 5. An oil chamber 60 was provided on both sides, and hydraulic pressure was applied to the oil chamber 60 from an oil supply hole 32. Further, in this conventional example, the oil supply hole 32 was normally communicated with the oil hole 71 of the bearing 7, so that it was used for both lubricating the bearing 7 and supplying oil pressure to the oil chamber 60. The conventional air supply device shown in FIG. 2 prevents air from leaking from the air chamber 5 by applying the oil pressure in the oil chamber 60 to the oil seal 90, and also attaches a lip seal 51 between the air chamber 5 and the supply hole 31. This prevents oil from flowing into the air supply hole 31.

In such a conventional air supply device, the oil seal 90 itself, which is the most important component, lacks durability;
Further, a large amount of oil needs to be held in the oil chamber 60, and if the oil seal 90 deteriorates, a large amount of oil may leak into the supply hole 31, causing an accident to the air machine body.

The present invention solves the problems of such known and conventional examples, and not only improves air tightness, but also easily stabilizes the air supply method, and furthermore, provides excellent durability. Examples thereof are shown in FIGS. 3, 4, and 5 and will be described below.

The gist of the present invention, as described in the claims, is based on the following configuration.

First, air chambers 5 are provided on both sides of the air supply hole 31 in the axial direction. Oil grooves 6 are provided on the outer sides of the air chambers 5 in the axial direction. These air chambers 5 and oil grooves 6
In the gap 39 between the case 3 and the rotating shaft 2, the rotating shaft 2
It is sealed by an outer ring 4 fitted to the case 33 or an inner ring 4 fitted to the case 33. On the other hand, the gap 38 between the case 3 and the rotating shaft 2 on the supply hole 31 side of the air chamber 5 is made of a flexible material.
For example, a lip seal 51 made of rubber.
is arranged to make the pressure in the oil groove 6 greater than the pressure in the air chamber 5.

The air supply device of the present invention having this configuration is used as the third
This will be described in detail below with reference to the embodiment diagrams shown in FIGS.

The pressure of supplied air is adjusted by a pressure reducing valve 11 from an air source 10, and is supplied to a supply hole 31 provided in a case 3 of the air supply device via an air valve 13 that switches between air supply and exhaust. The case 3 is fixed by a base (not shown), and has an air chamber 5 and an oil drainage chamber 8 inside.

On the other hand, the rotary shaft 2 is connected to an air machine (not shown), and an air vent 21 is provided in the rotary shaft 2, one end of which is connected to the air machine, and the other end is drilled in the radial direction to provide a supply hole. Air reservoir 33 communicating with 31
It is open to

Furthermore, a sleeve 23 is fixed to the rotating shaft 2 for processing and assembly reasons. Since the sleeve 23 is integrated with the rotating shaft 2 and is considered to be a part of the rotating shaft 2, it will be described below as the rotating shaft 2.

Air supplied from the air supply hole 31 to the ventilation hole 21 of the rotary shaft 2 via the air reservoir 33 tends to leak through the gap 38 between the rotary shaft 2 and the case 3. The leaked air is retained in the air chamber 5. On the other hand, the case 3 is provided with an oil supply hole 32, and the oil supply hole 32 is provided in the case 3 so as to include the boundary between the case 3 and the rotation shaft 2, as shown in FIG.
It opens into an oil groove 6 provided either in the case 3 as shown in FIG. 4, or in both. The oil pressure applied to the oil groove 6 is higher than the supply air pressure, and in the embodiment, it is applied as high as 2 kg/cm ² .

In the gap 39 between the case 3 and the rotating shaft 2 between the air chamber 5 and the oil groove 6, as shown in FIG. A ring is attached, and when attached, the ring is either an outer ring 4 having self-tension that acts radially outward, or a ring 4 that is inserted into an annular groove provided on the inner periphery of the case 3 at one point in the circumferential direction as shown in FIG. An annular ring with a spout is fitted to the ring, which incorporates a self-tensioning inner ring 4 which acts radially inward when fitted. ring 4
The air chamber 5 of the ring groove 49 receives the oil pressure of the oil groove 6.
The ring 4 is pressed against the side wall surface 48 to make this part airtight, and at the same time, the gap 39 between the rotating shaft 2 and the case 3 is made airtight by the radial tension of the ring 4 itself.

Therefore, the oil groove 6 is passed through the ring 4 from the air chamber 5 side.
No air leaks to the sides. On the other hand, a small amount of oil enters the air chamber 5 from the oil groove 6 side, which is the high pressure side, but by making the air chamber 5 sufficiently large,
The oil is discharged from the air chamber drain hole 54 along the air chamber wall surface, while the oil is fixed to the rotating shaft 2 on the supply hole 31 side as shown in FIG.
Seal lip 51 fixed to case 3 as shown in the figure
By providing this, oil is prevented from entering the air supply hole 31. Furthermore, the volume of the oil groove 6 is made significantly smaller than the volume of the air chamber 5, so that the amount of oil held is reduced, but the ring 4 is pressurized with the necessary and sufficient oil pressure, and a sufficient airtightness can be achieved. Even if the air conditioner deteriorates, a large amount of oil will not flow into the air chamber 5 from the oil groove 6 at once, and the possibility of oil entering the supply hole 31 is extremely low.

As described above, in the air supply device of the present invention, airtightness is achieved using hydraulic pressure higher than the air pressure to be supplied, so air leakage can be completely prevented, and
The air supply hole 31 and the ventilation hole 21 are in direct communication with each other, resulting in an extremely simple air circuit. Therefore, the air pressure is adjusted by an external circuit that extends from the air source 10 to the supply hole 31, and the circuit inside the air supply device is extremely simple, eliminating the need for special switches and valves, and preventing small amounts of foreign matter from entering. Not only is it not a problem, but
No special adjustments are required and an extremely stable air supply is possible.

Furthermore, in order to improve the sealing performance, the ring 4 is constructed by stacking two rings in the axial direction as shown in FIG. and use it. In addition, when the ring 4 is used as an outer ring, as shown in FIG. 6, the two-piece ring 4 shown in FIG. , 4 and case 3
The sealing performance is further improved by combining the inner peripheral surfaces of the rings 4, 4 with a back-up spring 40 that further promotes tension outward in the radial direction. If the rings 4, 4 and the back-up spring 40 are made of highly durable materials such as synthetic resin or metal, the durability and airtightness can be significantly improved compared to oil seals made of ordinary rubber or the like. .

Furthermore, in the air supply device of the present invention, a third
As shown in the embodiment diagrams in FIGS. 4 and 4, the outside of the oil groove 6 in the axial direction is airtight and the air chamber 5 is drained of oil.

That is, an annular or complicatedly divided bearing 7 is installed on the opposite side of the oil groove 6 from the air chamber 5.
A second ring 41 is attached to the gap 37 between the case 3 and the rotary shaft 2 between the case 3 and the oil groove 6 . In order to prevent oil from leaking to the bearing 7 side, the second ring 41 is an inner ring 41 fitted to the case 3 as shown in Fig. 4 or an outer ring 41 fitted to the rotating shaft 2 as shown in Fig. 3. A tension ring 41 is used.

Furthermore, an oil drain chamber 8 is provided in the case on the outside of the bearing 7, and as shown in the embodiment diagram in FIG. 81 to make the oil airtight, and the oil is drained from the oil drain hole 84.

In this case, as shown in the embodiment diagram in FIG.
It is also possible to make it airtight using an oil pan 85.

Furthermore, the side wall 53 on the supply hole 31 side of the air chamber 5 has a protrusion that protrudes in the radial direction as shown in FIG. Intrusion of oil into the supply hole 31 can be further prevented by providing the portion 52 or by assembling a ring-shaped member 57 forming a protruding portion as shown in FIG.

Furthermore, in the present invention, drain holes 54 and 84 are provided in the air chamber 5 and the oil drain chamber 8, respectively.
Air and oil discharged from the air chamber drain hole 54 are separated into only oil by an auto drain 9.

Further, the oil-separated air is exhausted by an exhaust valve 16. This is because if the air chamber pressure becomes significantly higher than the supply hole 31 pressure when air is exhausted from the air machine, oil may enter the supply hole 31. It is necessary to open the exhaust valve 16 immediately beforehand to lower the air chamber 5 pressure.

On the other hand, an oil relief hole 61 is provided in the oil groove 6, and a relief valve 14 is attached thereto to release abnormally high pressure within the oil groove 6.

As described above with reference to the embodiments of the air supply device of the present invention, the present invention not only provides complete airtightness, but also has a simple air supply circuit, so even if an airtight leak occurs, it is easy to find the leakage point. With Shiru,
Since the pressure is adjusted by the external circuit of the air supply device, it is easy to adjust, and there is no possibility of oil or other foreign matter getting into the air supply hole. The circuit is never closed.

On the other hand, each component has excellent durability, and the device is not subjected to large mechanical loads, and the durability of the device is also extremely excellent.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a known air supply device. FIG. 2 is a sectional view of a conventional air supply device. 3 and 4 are cross-sectional views of an embodiment of the air supply device of the present invention. FIG. 5 is a perspective view showing an embodiment of the two-piece ring in the air supply device of the present invention. FIG. 6 is a partial sectional view showing another embodiment of the ring in the air supply device of the present invention. Explanation of numbers, 2...rotating shaft, 21...ventilation hole,
3... Case, 31... Supply hole, 4... Ring,
42... Second ring, 5... Air chamber, 51... Lip seal, 6... Oil groove, 7... Bearing, 8... Oil drain chamber, 9... Auto drain, 13... Air valve,
16...Exhaust valve.

Claims (1)

[Claims] 1. A ventilation hole 21 is provided in the rotating shaft 2, an air supply hole 31 communicating with the ventilation hole 21 is provided in the case 3 that supports the rotating shaft 2, and the rotating shaft 2,
In an air supply device in which air leaking between cases 3 is sealed by liquid pressure, air chambers 5 are provided on both sides of the supply hole 31 in the axial direction, and oil grooves 6 are provided axially outward of the air chambers 5.
A lip seal 51 is arranged on the supply hole 31 side of the air chamber 5, and a rotary shaft 2 is provided between the air chamber 5 and the oil groove 6.
Alternatively, an air supply device to a rotating body characterized in that an outer or inner ring 4 is fitted to the case 3, and the oil groove 6 pressure is made higher than the air chamber 5 pressure. 2 A bearing 7 fixed to the case 3 is disposed outside the groove 6 in the axial direction, and a second bearing 7 is disposed between the bearing 7 and the oil groove 6.
An air supply device for a rotating body according to claim 1, characterized in that a ring 41 is disposed and an oil drain chamber 8 is disposed outside the bearing 7 in the axial direction. 3. The rotating body according to claim 1, characterized in that an exhaust valve is connected to the air chamber 5 via an auto drain 9 to operate at the same time or immediately before the exhaust switching of the air valve 13. Air supply device to. 4. An air supply device for a rotating body according to claim 1, characterized in that a side wall 53 of the air chamber 5 on the supply hole 31 side is provided with a protrusion 52 that protrudes in the radial direction.