WO1996030694A1

WO1996030694A1 - Vertical shaft with oil feed channel

Info

Publication number: WO1996030694A1
Application number: PCT/EP1996/000572
Authority: WO
Inventors: Rudolf Bahnen; Hans Kriechel; Karl-Heinz Ronthaler
Original assignee: Leybold Aktiengesellschaft
Priority date: 1995-03-28
Filing date: 1996-02-10
Publication date: 1996-10-03
Also published as: EP0817940A1; DE29505181U1

Abstract

The invention relates to a vertical shaft (1) with a central oil feed channel (2), with two oil ejection points (4) at the shaft bearings (5) and a conical section (3) widening conically from bottom to top to convey oil. To improve the lubricant flow it is proposed that the conical section (3) extend from the lower end of the shaft (1) to above the lower oil ejection point (4).

Description

Vertical shaft with oil delivery channel

The invention relates to a vertical shaft with a central oil delivery channel with two oil spray points located above shaft bearings and with a section which widens conically from bottom to top and is used for oil production.

The supply of bearings to high speed shafts is critical. On the one hand, it must be ensured that the oil flow supplied does not stop. On the other hand, the oil must be metered, that is to say supplied to the bearings in very small, just sufficient amounts.

From DE-A-23 09 665 it is known that the conical section of the oil production channel serving for oil production extends from its lower open end to the first oil spray point. The oil delivery channel section which adjoins it and extends to the second oil spray point is cylindrical. With solutions of this type, lubricating oil flows with certain properties in terms of quantity, quantity distribution (bottom-top), uniformity, etc. cannot be realized. They are usually run with excess oil, which is not critical at relatively low shaft speeds.

From EU-A-315 761 it is known to arrange a cylindrical, inclined to the central axis of the shaft to provide the oil channel. In order to ensure that both spraying points are always supplied with lubricating oil, it is proposed to arrange the spraying openings of the two spraying points on opposite sides of the oil delivery channel. However, equipping a shaft with an oil feed channel inclined with respect to its axis is associated with a relatively high production outlay.

The object of the present invention is to improve a shaft suitable for vertical use with a central oil feed channel with respect to the lubricant flow.

According to the invention, this object is achieved in that the conical section extends from the lower end of the shaft to significantly beyond the lower oil spray point. This measure initially ensures that there is sufficient conveying action even above the lower spray point to convey the oil that has not yet been sprayed off to the second oil spray point.

The lower oil spray point is expediently located approximately at the center of the conical section of the oil delivery channel. It is also advantageous if this spraying point comprises only two spraying bores, for example opposite one another. Such an embodiment has the advantage that only the partial quantity which is branched off in the region of the lower spray point is decisive for the quantity distribution of the oil (bottom-top). The oil can continue to rise unhindered between the bores and is also able to get to the upper spray point through the delivery mechanism that is still sufficiently available below. Further advantages and details of the invention will be explained with reference to an embodiment shown in the figure.

In the figure, the shaft with 1, its central, bottom open oil delivery channel with 2, the conical section of the delivery channel 2 with 3, the lower oil spray point with 4, the lower bearing with 5 and the oil sump generally with 6. The oil level in the oil sump 6 is indicated by line 7.

The oil sump 6 comprises a central sleeve 8 which is supported on the base plate 9 and into which the lower end of the shaft 1 projects. Via vertical bores 11 and a chamber 12, the oil passes through a further central bore 13 into the sleeve 8. Inside the bore 13 there is an insert 14 with a throttle bore 15. This determines the flow into the sleeve 8 per unit of time Amount of oil.

According to the invention, the conical section 3 of the delivery channel 2 extends far beyond the lower spray point 4. This comprises only two oil spray bores 16, 17, so that there are conical wall areas - between the bores 16, 17 - on which the further rise of oil is not hindered, and secondly bores with a relatively large diameter that is not sensitive to contamination can be provided.

If the conical section 3 did not extend significantly beyond the lower oil spray point, then sufficient lubrication of the upper bearings in the area of the upper oil spray point (not shown) would only be possible if the quantity delivered is greater than the quantity sprayed below. This would require small bores as chokes and a bypass for the excess oil in the area of the upper spray point. at Bores with small diameters, however, have an increased risk of contamination and clogging and thus the risk of failure of the bearing lubrication.

In the exemplary embodiment shown, the conical section 3 is part of a separate component 21 which is inserted from below into a bore 22 of the shaft 1 which is enlarged relative to the cylindrical section of the oil delivery channel 2. The component 21 is not completely inserted into the bore 22, so that a groove 23 is located above the conical section 3. This groove 23 has the function of a centrifugal filter. During operation, the groove 23 is filled with oil and, if necessary, picks up particles carried up to this point.

Centrifugal filters of this or a similar type can also be present at several locations in the central oil production channel 2.

Claims

Vertical shaft with oil delivery channel

1. Vertical shaft (1) with a central oil feed channel (2), with two oil spray points (4) located at the height of shaft bearings (5) and with a section (3) which widens conically from bottom to top and serves for oil production, characterized ge indicates that the conical section (3) extends from the lower end of the shaft (1) to beyond the lower oil spray point (4).

2. Shaft according to claim 1, characterized in that the lower spray point (4) is approximately at the level of half the cone section (3).

3. Shaft according to claim 1, characterized in that it has only two oil spray bores (16, 17).

4. Shaft according to claim 1, 2 or 3, characterized gekenn¬ characterized in that a sleeve (8) is assigned to its lower end, which is supplied from below with the oil in the oil feed channel (2).

5. Shaft according to claim 4, characterized in that an insert (14) with a throttle bore (15) is provided for the metering of the oil in the supplying oil bore (13).

6. shaft with an oil delivery channel (2), in particular according to one of the preceding claims, characterized in that it is equipped with one or more centrifugal filters (23).

7. Shaft according to claim 6, characterized in that a groove (23) surrounding the oil delivery channel (2) forms the centrifugal filter.

8. Shaft according to claim 7 and one of claims 1 to 5, characterized in that the conical section (3) is part of a separate component (21) which does not completely expand into an enlarged to form the groove (23) Bore (22) of the shaft (1) is inserted into the shaft (1) from below.