DD156056A3 - HYDROSTATIC GEARING MACHINE - Google Patents

Abstract

The invention relates to hydrostatic gear machines for alternating direction of rotation with external gears, the pinion shafts are arranged in bearing bodies with existing on the outer Stirnflaechen high pressure fields. The aim and task consist in the creation of high-pressure fields for axial play compensation in gear machines, which are simple in design, as far as possible compensated offset the lifting forces, conveniently arranged and economical to produce. According to the invention, this object is achieved by arranging the high-pressure field for one direction of rotation on the bearing body of a face of the gears and the high-pressure field for the other direction of rotation is reversed on the bearing body of the opposite end face of these gears, with the high-pressure fields to unequal surface portions on either side of the axis of symmetry of the bearing body. Another separate high-pressure field is arranged within the low-pressure fields, which are connected to the non-pressurized drain. Field of application of the invention are used as a pump or motor hydrostatic gear machines with alternating direction of rotation.

Description

- Ί- 2 2 6 O 7 7

Title of the invention Hydrostatic gear machine Field of application of the invention

Hydrostatic Zahnradrnaschine, used as a pump or motor for changing rotational direction and externally meshing gears whose pinion shafts arranged in both sides of the gears bearing bodies and these are mounted axially movable in analog recesses of a housing, wherein between the respective outer end surface of both bearing body and the corresponding counter surface acted upon by the housing, limited by seals high-pressure fields for the compensation of the axial clearance between gears and bearing bodies are arranged, which are mutually connected to the high and JTiederdruckseite the gear machine.

Characteristic of the known technical solutions

Known is a usable as a pump or motor hydrostatic gear machine (DE-PS 910 384, DE-AS 1,553,259) with a device for compensating the axial play between the gears and the bushings, the gear machine is designed for changing directions, which is why for the supply as well as for the removal of the medium existing chambers are connected via the check valves with the Axialdruckfeld. The non-return valves close respectively to the low-pressure chamber. Further non-return valves, which close to the higher-pressure chamber, serve to discharge the leakage to the low-pressure side of the gear machine.

Furthermore, also usable as a motor hydrostatic .Zahnradpumpen (DE-AS -1.134 · 289, DE-AS 1,403,888, DE-AS 1 * 528 »954) for changing direction of rotation are known whose gear shafts are arranged in axially movable bearing bodies (sockets or glasses) "

At least on one of the gears facing away from this bearing body is a delimited by seals pressure field for the axial play compensation arranged due to the change of direction of the gear pump, the pressure field is symmetrical formed «

In addition, a hydrostatic gear machine (DE-OS 2 »536« · 242) for changing directions of rotation is known, both sides of the bearing body (bearing glasses) Irydrostatic pressure fields for axial play compensation has · The hydrostatic pressure field, which ensures the bearing of the bearing body to the gears is divided into four sectors. One of the two lateral sectors is pressurized, depending on the direction of rotation, with pressure medium, the other sector is connected to the non-pressurized return / drain · The two sectors located above and below in the area of the vertical symmetry axis $ v / are constantly supplied with a reduced / reduced final pressure. The compromise of butt to the housing of the Radkammern abutting seals should allow the largest possible field at the back of the bearing body for use as pressure field _s sectors.

However, only a limited area is available for the pressure field of the respective direction of rotation, since every available area of the two bearing bodies must be set up for all pressure field functions. "

All these hydrostatic gear machines have a complex and complicated structural design, since arranged on both sides of the gears pressure fields each have limited separate areas for the direction of rotation left or "right",

In addition, leakage areas must be arranged and effectively sealed. · The space available for these areas may be limited

-3- 2 2 6 ü 7 /

Compromises between the tooth height of the gears and the space available in the back pressure field. The optimization of the Fb'rderstromes when used as a gear pump by large teeth is the accommodation of necessary pressure fields · for the axial play compensation in changing direction of rotation, taking into account conditional ickölsammelräurne contrary to the same cross-sectional position of the bearing body *. When used as a gear motor also correspondingly larger pressure fields are required due to the larger circumferential angle of the pressure zone.

Object of the invention

The aim of the invention is to provide a usable as a pump or motor hydrostatic gear machine for changing direction of rotation, the pressure field for the axial clearance compensation with optimal effect is simple and economical in construction and in the arrangement,

Explanation of the essence of the invention

The object of the invention is to provide a hydrostatic Zahnradraaschine with axial clearance compensation for changing directions of rotation, which ensures a far-reaching compensation of the lifting forces through maximum use of the available cross-sectional area of the wheel chamber on both sides of the gears, which arise by optimizing the size of the tooth gaps of the gears »

According to the invention, this object is achieved in that the high-pressure field for a direction of rotation on the bearing body of a front side of the gears and the high-pressure field for the different direction of rotation are reversed on the bearing body of the opposite end face of these gears, with the high-pressure fields to unequal surface portions on both sides of the axis of symmetry Extend bearing body and. each with a chamber of the high and low pressure side are connected. From this chamber there is a separate connection via a channel and a check valve to a low pressure field and connection via a recess to a separate separate high-pressure field which is disposed within the low-pressure field and at least one low-pressure field via a channel with the non-pressurized drain connection. Said check valves are in axial cylindrical channels in the housing

~ 4 ~ 22 6 0 77

or arranged in a subsequent lid and close in the direction of the respective low pressure field. Preferably, these check valves are formed without a spring, have a spherical closing body and an outer sealing ring and are secured by means of spring rings against axial displacement of the recesses to the arranged in the low pressure fields n separate high-pressure fields are mounted in bearing bodies and connected to the respective high-pressure chamber and Thus have more recesses in the opposite bearing bodies with the high-pressure fields of the opposite lid fluid connection. The arranged within the low-pressure fields separate high-pressure fields are smaller in area than the first-mentioned high-pressure fields. The channel connecting the low-pressure field with the non-pressurized drain is arranged in the cover, which closes off the housing at the end. · -.....

The inventive design and arrangement of the alternating high-pressure fields in hydrostatic gear machines changing Drehhrchtung ensures optimal compensation of acting on the bearing body lifting forces. Since in each case the high-pressure field / low-pressure field is arranged on a respective bearing body for a rotational direction, there is a sufficiently large area on the back of each bearing body to form the pressure field and thus to compensate for the contrasting forces available. Due to the relatively large available surface there is the possibility of maximum adjustment of the tooth gaps for the gears «, Thus, large tooth gaps can be realized in cross-section, which ensure a correspondingly large delivery or absorption volume of the hydrostatic gear machine with low Zahnkopfkreisdurchmesser. In the case of extremely one-sided pressure loads on the end faces of the bearing bodies, additional support fields which are acted upon by the high pressure can be arranged within the low-pressure field (see exemplary embodiment according to FIG. 3) in order to prevent tilting or tilting of these bearing bodies.

• 5-

~ 5 ~ 22 6 0 7 7

embodiment

Hereinafter, the subject invention is explained in several embodiments, wherein the drawings show the following?

Pig, 1 a hydrostatic Zahnra & machine in longitudinal section, which has pressure fields on both bearing bodies

Pig. 2 shows another longitudinal section of the gear machine in the plane A-A according to Pig «1

Pig. 3 is an exploded view of the gear machine according to Pig. 1 and 2 with valves for internal leakage discharge and bearing goggles

Pig. 4 an exploded view of the gear machine with bearing bushes and external leakage discharge via channels.

In a housing 1 of the hydrostatic gear machine spectacle-shaped bearing body 2,3 are arranged with limited axial mobility. These bearing bodies 2, 3 serve to receive two pinion shafts 4, 5, which have toothed wheels 4 a, 5 a. The end faces of these gears 4a, 5a come to inner end surfaces of both bearing body 2.3 to the plant. At both ends of the housing 1 lid 6.7 are screwed, which close the receiving openings for the bearing body 2.3. In addition, the inner end surface of each cover carries 6.7 Dichtelernente 8.9 * 10.11, which .Hochdruck-, fields 12,13,14,15 for the axial clearance compensation or for the support of the bearing body 2.3 limit * The sealing elements 8.9 are the same as in Pig. 3, formed as Pormdichtung and limit a symmetrical, for each one direction of rotation of the gear v / irksames .Hochdruckfeld 12,13 »while designed as a circular ring sealing elements -10,11 limit a surface for additional hydrostatic support of the bearing body 2,3. Of the sealing elements 8,9 also limited low pressure fields 16,17 to collect the leak oil have over

s β ..

cylindrical channels 18,19 Plüssxgkeitaverbindung to chambers 20,21 in the housing 1 »These chambers 20,21 serve the supply and discharge of the hydraulic medium and function depending on the application of the gear machine as a pump or motor and depending on the direction of rotation as high or Low pressure side, in the channels'18,19 a check valve 22 _S 23 is arranged, which closes in the direction of low pressure field 16 and * 17 of the sealing elements 8 _S 9.

Both bearing bodies 2, 3 have, at the intersection of their circular surfaces, axially extending recesses 24, 25 which connect the chambers 20, 21 via the engagement region of the toothed wheels 4 a, 5 a to the limited high-pressure field 12, 13. By mutual arrangement of the high-pressure fields 12,13 in the respective cover 6,7 to each other, relative to the longitudinal axis of the gear machine, the chamber 20 is connected via the recess 25 in the carrier body 3 to the high-pressure field 13 of the lid 7, while from the opposite chamber 21 via the recess 24 in the bearing body 2 is a connection to the high-pressure field 12 of the lid 6.

On the respective opposite side of these recesses 24,25 has each bearing body 2,3 another, smaller in cross section axial recess 26,27 which connects the respective chamber 20 and 21 to the high pressure field 14 and 15 in the lid 6 and 7 respectively ,

From the low pressure field 17 of the lid 7, a channel 28 leads to the outside, which can be closed by a screw · The present in the channels 18,19 check valves 22,23 are designed without a spring and have a spherical closing body 30,31 and arranged on the outer circumference sealing ring 32nd , 33 * attached, or secured against axial displacement, the check valves 22,23 in the housing 1 by means of locking ring 34,35 »The cover 7 is designed as a mounting plate for the gear machine and the pinion shaft 4 has a longitudinal longitudinal bore 36, which the discharge the leak oil serves.

The operation of hydrostatic gear pumps or gear motors is well known and therefore not described in detail, wherein present gear machine according to the invention has the following features.

When used as a right-handed motor or .. counter-rotating pump is in accordance with Pig »3 in the chamber 20 under high pressure medium, whereby the arranged in the channel 18 check valve 22 is closed and thus the connection ZUiP ₁ low-pressure field 16 is interrupted.

Through the recess 25 in the bearing body 3, the medium enters the high pressure field 13 and thereby presses the bearing body 3, taking into account the lubrication gaps against the end faces of the gears 4a, 5a and this against the bearing body 2. On the other hand media passes through the recess 26 of the opposite bearing body 2 in the high-pressure field 14 performing a support function, whereby a force arises which acts on the bearing body 2 and partially compensates for the tilting moment by the high-pressure field 13.

A portion of the leak oil collects in Hiederdruckfeld 16 of the lid 6 and passes through the coaxial longitudinal bore 36 of the pinion shaft 4 in the opposite Uiederdruckfeld 17 of the lid. 7

The leak oil is supplied from here via the open check valve 23 in the channel 19 of the chamber 21, which has the low-pressure side connection. Furthermore, the medium present in the high pressure field 12, which is depressurized in this phase, 'via the recess 24 of the bearing body 2 also passes to the chamber 21,. which has the üiederdruckseite compound.

If the chamber 21 due to the operation with increased discharge pressure at the engine, or corresponding form pressure at the pump, pressure loaded, the pressureless discharge of the leak oil from Hiederdruckfeld 17 via the channel 28 in the lid 7 to a separate container, not shown. Pur this case, builds up by the discharge pressure in the high pressure field 12 of the lid 6 and in the high pressure field 15 of the lid 7, an intended pressure.

If, in the reverse order of use as a left-handed motor or as a clockwise-rotating pump, all the described punctures run correspondingly mutatis mutandis.

-8th-

-8- 2 2 6 0 7 7

he high pressure is in this case in the chamber 21, while c! the return of the leak oil via the chamber 20 takes place «In the embodiment according to Pig. 4, the invention is shown on a gear machine with bush-shaped bearing bodies 37j 38s39s40 and external leakage discharge via a channel 42 »

Through a recess 45 in a housing 46, medium flows into the high-pressure field 13 of a cover 41 and presses from there the bearing bodies 37, 38 against the end faces the gears 4a, 5a and this further against the bearing body 39 ₅ 40, which are supported on a lid.

A portion of the leakage collects in the low pressure field 16 of the lid 43 and flows through the longitudinal bore 36 of the pinion shaft 4 in the iTiederdruckfeld 17 of the cover 41 · From here the total leakage is discharged via the channel 42 to the outside. The high pressure field 12 in the lid 43 is connected via a recess 47 in the housing 46 with a chamber 48 of the low pressure side «·

Pur the applications with expiration-pressure load at the gear motor and form in the gear pump, builds on the described direction of rotation in the high pressure field 12 a Ausweichsdruckfeld on «If the use in the reverse direction of rotation, the punctures run here in reverse, so according to §

The high pressure is thus in the chamber 48. In this embodiment, according to Pig. 4 are sealing elements 10,11 and check valves 22,23, as described in Pig. 3 · are shown, not required for proper puncture.

In both embodiments, the lid 7 and 41 is formed as a mounting plate for the gear machine.

-9-

Claims (6)

22 6 0 77 invention claim Hydrostatic gear machine, which is designed as a pump or motor for changing rotational direction with externally meshing gears whose pinion shafts are axially movable mounted in both sides of the gears bearing bodies and these in analog recesses of a housing, wherein between the respective outer end surface of both bearing body and the corresponding counter surface the housing hydrostatically acted on, limited by seals high pressure fields for the compensation of the axial clearance between gears and bearing bodies are arranged, which are mutually connected to the high and low pressure side of the gear machine, characterized in that the high pressure field (13) for a rotational direction Bearing body (3j37,38) of one end side of the gears (4a, 5a) and the high pressure field (12) for the other direction of rotation laterally reversed on the bearing body (2,39,40) of the opposite end face of these gears (4a, 5a) lies, wherein the high-pressure fields (12,13) to unequal surface portions on either side of the axis of symmetry of the bearing body (2,3j37,38,39 »40) and are each connected to a chamber (20,21) of the high and low pressure side, from which separate connection via a channel (18,19) and a check valve (22,23) to a respective low-pressure field (16,17) and connection über.eine recess (26,27) to each separate separate high-pressure field (14,15 ), which is arranged within the low-pressure field (16, 17), and at least one low-pressure field (17) has a connection via a channel (28, 42) to the pressureless outlet » -a 22 6 077 2 * hydrostatic gear machine according to item 1 characterized in that the check valves (22,23) in axial cylindrical channels (18,19) in the housing (1) or in a subsequent cover (6,7) are arranged and in Close direction of low pressure field (16,17) » 3 »hydrostatic gear machine according to point 1 ^ and 2 characterized in that the check valve (22,23) is formed without a spring, a spherical closing body (30,31) and an outer sealing ring (32,33), and by means of retaining rings ( ₅ 35) is secured against axial displacement * ' 4 "hydrostatic gear machine according to item 1, characterized in that the recesses (26,27) to the in the low-pressure fields (16,17) arranged separate high-pressure fields (14,15) mounted in. Bearing bodies (2,3) and with the respective, are connected under high pressure chamber (20,21) and thus via further recesses (24, 25) in the opposite bearing bodies (3,2) with the high-pressure fields (12,13) of the opposite cover (6,7) have fluid communication * 5 «hydrostatic gear machine according to item 1 and 4, characterized in that within the Uiederdruckfeider (16,17) arranged separate high pressure fields (14,15) are smaller in area than the high pressure fields (12,13) * 6 * Hydrostatic gear machine according to item 1, characterized in that the ltfiederdruckfeld (16,17) with the non-pressurized drain connecting channel (28,42) in the cover (6,7 _s 41,43) is arranged, which terminates the housing end face. - 3 sheets of drawings -