DE2132526A1 - DEVICE FOR THE HYDROSTATIC GUIDANCE OF MOVING PARTS - Google Patents

Description

Dipl.-Ing. KAHLER - Dr.-lng. STARK · DIpl.-lng. BONSMANN PATENT LAWYERS ^ I

D-415O Krefeld 1 Moerser Straße 1 4Ο Fernruf (O 21 51) 2 OM- 6Q

_Since tum: June 29, 1971

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4 Ta 71 188

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P. Konings Machinefabriek, Ijzer- en Metaalgieterij N.V., Swalinen (Netherlands), Bosstraat 93

Device for the hydrostatic guidance of mutually movable parts

The invention relates to a device for the hydrostatic guidance of mutually movable parts, with one in one Guide track with wrap-around guided sliding element.

In a hydrostatic bearing is known between the surfaces sliding on each other by means of an outside of the A pressure-resistant oil film is built up on the oil pump located in the bearing, which is independent of the sliding speed. Hydrostatic Bearings are known both for rotary movements and for translator movements. With a hydrostatic However, storage always occurs when it is not possible to attach a wraparound. Under a Wrap is understood that the arrangement is made in a hydrostatic bearing that the sliding body over

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each provided on two opposite sides of the sliding body, acting in opposite directions in their direction of force OeIfilme, is tense. With hydrostatic radial bearings a wrap-around is achieved in that bearing pockets are always diametrically opposed, thereby creating a mutual preload is achieved. In the case of a sliding body guided on a guideway, however, it is difficult to obtain a corresponding Provide wraparound.

In the case of a conventional sliding guide of a sliding body, for example a machine slide, on a guideway, So a so-called hydrodynamic bearing, a wraparound is usually provided, for example from a attached to both sides of the sliding body and encompassing the guide track laterally from below, screwed to the sliding body Leadership part consists. With a hydrodynamic plain bearing, this wrap-around is not loaded but serves only as a safeguard in the event of extreme loads and to accommodate the slide clamp. These, forming the encirclement After the machine slide has been placed on the guideway, parts are subsequently removed from the slide guide screwed on opposite side.

In the case of hydrostatically mounted guideways, however, the wraparound is also due to the during normal operation the forces occurring on both sides of the hydrostatic bearing. Because the wraps for design reasons be attached by screw connections, is the rigidity the wraps in most cases are not sufficient.

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This has the consequence that the wraparound consisting of opposing guideways expands and the Gap-forming surfaces are no longer parallel, whereby the function of the hydrostatic bearing is endangered.

The invention is based on the object of a device for hydrostatic guidance of mutually movable parts with a sliding element guided in a guideway with wraparound to create the rigidity of the wraparound forming, opposite guide surfaces for the sliding element be designed so that the wraparound does not deform under all operating conditions, at the same time a The smallest possible size is sought. Furthermore, the aim is to that the device after installation in a machine without additional adjustment work after connection to the The hydraulic unit is immediately ready for operation.

This object is achieved according to the invention in that the Guide track consists of a one-piece, essentially symmetrical U-shaped profile with legs of approximately the same length and the guide surfaces on the inner sides the legs are arranged opposite one another in parallel and the sliding element has corresponding guide surfaces, the bearing pockets that can be acted upon with pressure oil via throttles to form a hydrostatic film between the Fülirungsflachen are provided. The invention Guideways and sliding elements can be supplied as components and on the fixed or moving machine parts

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be attached. The inventive design of the guide track is achieved that the wraparound by the Legs of the U-shaped profile is formed, can have sufficient rigidity with a small size. Since the Guide surfaces on the inner sides of the legs are arranged opposite one another in parallel, which are created by the hydrostatic Storage restoring forces that occur during operation are always completely different from the opposite Guide surface added, so that no oblique or transverse to the guide surfaces force component of the fc preload and restoring forces can occur.

Provided that the sliding element is to be performed over relatively long distances, it is expedient to connect a plurality of guide tracks according to the invention each _n ^ £ _en end faces of the U-shaped profiles to each other. For this it is necessary that the internal dimensions of all interconnected guideways are always the same size. In order to achieve this, a further feature of the invention provides that the guide surfaces of the guide track are coated with plastic. The plastic coating is primarily used to enable the guideways to be manufactured with always the same internal dimensions. For this purpose, a fitting piece is inserted into a U-shaped profile produced with oversize, which corresponds in its dimensions to the sliding elements, plus the desired gap thickness on each side. The space between the legs of the U-profile and the fitting piece is then hardened with a non-shrinkage or low-shrinkage

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Plastic poured out. Then the fitting piece is again removed. The plastic coating thus applied corresponds gut exactly the desired internal dimensions.

In a further embodiment of the invention it can be provided that the web of the U-shaped profile as at right angles to the legs lying flat surface is formed and the web surface is designed as a guide surface and that of the web surface facing side of the sliding element a corresponding guide surface with at least one location pocket for training a hydrostatic film between these guide surfaces. This enables that of the hydrostatic Storage can also be absorbed forces directed in the longitudinal direction of the legs of the U-shaped profile.

In a further embodiment of the invention it is provided that the Throttle from one end sealingly attached in the bearing pocket feed lines and with the other Enae in a common one Pressure oil supply channel pointing capillary tubes consists. By pressurizing the pressure oil supply channel over All storage pockets can be supplied with pressure oil with a single connection.

According to a further feature of the invention, the pressure oil supply channel is continuous in the sliding element in the longitudinal direction designed and has connection options for the supply of pressure oil on both sides. When using a single such The connection for the pressure oil

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feed attached to one longitudinal end, and the other Close the opening provided along the length with a plug? closed. If several such sliding elements are used in series, that is, each connected to one another at the end faces x are to be grounded, the plugs at the connection points removed so that the pressure oil supply channels on these points are seamlessly connected to each other. A front end of the entire arrangement is through a Stopper closed, while the connection line for the pressure oil supply is attached to the other end.

According to a further feature of the invention it is provided that the guide surfaces of the sliding element on both sides of im Sliding element attached grooves are limited. The grooves are used to allow the leaking oil to escape unhindered.

Furthermore, the invention provides that a lockable, externally accessible connection is provided for each storage pocket is. These connections are used to monitor the pressure in the storage pockets even when they are installed . enable.

Finally, it can be provided according to the invention that the storage pockets are provided with pressure oil supply in the guide track and the guide surfaces of the sliding element are pocketless.

In the drawing, exemplary embodiments of the invention are shown

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posed. Show it:

1 shows a section through a guide track and a sliding element ;

FIG. 2 shows a section along the line II-II in FIG. 1;

FIG. 3 shows a further exemplary embodiment in a representation corresponding to FIG. 1; FIG.

FIG. 4 shows a section along the line IV-IV in FIG. 3.

A guide track 1 consists of a one-piece, essentially symmetrical U-shaped profile with in Legs 2 and 3 of approximately the same length. The insides of legs 2 and 3 are designed as guide surfaces 4 and 5 arranged opposite one another in parallel. The guide surfaces 4 and 5 consist of v attached to the legs 2 and 3 Plastic.

A sliding part 6 is guided hydrostatically between the legs 2 and 3. To this end, the sliding element 6 is parallel opposite guide surfaces 7 and S on. In the guide surfaces 7 and 8 bearing pockets 9 are provided, which from a pressure oil supply channel 10 via capillaries pressure oil is supplied. In this way it forms in the bearing gap between the guide surfaces 4 or «7 and 5 or 8 a hydrostatic film of «The capillaries 11 consist of one end sealing in the storage pocket feed lines attached and with the other end loosely in the pressure oil supply channel 10 pointing capillary tubes. Every storage bag 9 is still on a branch hole 13 with a

displaceable, externally accessible connection 14 in connection. This connection 14 is used to connect a pressure measuring device, in order to be able to measure the pressure in each individual storage pocket 9 during operation. The pressure oil supply channel has connection options 15 and 16 on both sides for the supply of prints.

The guide surfaces 7 and 8 of the sliding element 6 are on both sides limited by grooves 17 and 18 made in the sliding element. The grooves 17 and 18 are used to drain the relieved Oeles. The hydrostatic guide track 1 and the sliding element 6 are ground on all sides and have screw holes 19 and 20 respectively. This means that these parts can be attached to machine bodies or to moving machine parts four den.

The exemplary embodiment shown in FIGS. 3 and 4 differs from that shown in FIGS. 1 and 2 Embodiment in that the side of the sliding element 6 facing the web of the U-shaped profile is also is designed as a guide surface 22 also with bearing pockets 23. The web of the U-shaped profile is accordingly designed as at right angles to the legs 2 and 3 lying, flat and plastic-coated guide structure. As a result, the legs 2 and 3 can also act on the sliding element in the longitudinal direction from the hydrostatic bearing acting forces are absorbed.

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Claims (8)

Expectations M J Device for hydrostatic guidance against each other movable parts, with a sliding element guided in a guideway with wraparound, characterized in that that the guide track (1) consists of an integrally formed, essentially symmetrical U-shaped profile with legs (2, 3) of approximately equal length and the guide surfaces (4, 5) on the inside of the legs (2, 3) are arranged opposite one another in parallel and the sliding element (6) has corresponding guide surfaces (7, 8), the bearing pockets (9) which can be acted upon by pressure oil via throttles to form a hydrostatic film are provided between the guide surfaces (4, 7 or 5, 8). 2. Apparatus according to claim 1, characterized in that the guide surfaces (4, 5) of the guideway are coated with plastic. 3. Apparatus according to claim 1 or 2, characterized in that the web (21) of the U-shaped profile as a right angle to the legs (2, 3) lying flat surface is formed and the web surface as a guide surface (24) is formed and the side of the sliding element (6) facing the web surface (24) has a corresponding guide surface (22) with at least one bearing pocket (23) for the formation of a hydrostatic film between them 209886/03 / * / * Has guide surfaces (22, 24). 4. Device according to one of claims 1 to 3 »characterized in that the throttle is attached and with one end sealingly in the bearing pocket feed lines (12)
the other end in a common pressure oil supply channel (10) facing capillary tubes (11). 5. Device according to one of claims 1 to 4, characterized in that that the pressure oil supply channel (10) in ^ Sliding element (6) is formed continuously in the longitudinal direction and on both sides connection options (15) for the
Having pressure oil supply. 6. Device according to one of claims 1 to 5, characterized in that the guide surfaces of the sliding element
(6) attached on both sides of the sliding element (6)
Grooves (17 »18) are limited. 7. Device according to one of claims 1 to 6, characterized in that that for each storage pocket (9, 23) a displaceable, externally accessible connection (14) is provided. 8. Device according to one of claims 1 to 7, characterized
characterized in that the storage pockets with pressurized oil supply
are provided in the guide track (1) and the guide surfaces of the sliding element (6) are pocketless * 209886 / 03U * Le e rs e ite