DE2125348A1 - Pressure balanced power steering pump - Google Patents

Description

Dip I.-ing. Egon Prince "^

Dr. Gertrud Hauser βοοο Manchen 6o, J ^ ^W

Dipl.-Ing. Gottfried Leiser Ern, b _ero .r, .ra * ,. 19 2125348

Patent attorneys

TRW INO

Telegrams, Labyrinth Munich Av.

23 555 Euolid Avenue

Cleveland, Ohio 44 117 / V.StiA. Our sign; T 1029

Pressure balanced power steering pump.

The invention "relates generally to a pressure balanced A power steering pump comprising a housing and an assembled portion of parts comprising the includes a sliding ring, which forms a punipe can " In this pump chamber, a rotor is arranged, which carries a sliding body or several sliding bodies, which are can move radially and can pivot in the angular direction when they are adjacent to the circumference of the Follow the pump chamber wall. In particular, relates the invention to an improved slide or valve plate and to an improved top plate incorporated in one such a pump are provided, with this improvement a maximum suction is achieved to to achieve a maximum charge or pre-compression at the inlet.

The prior art is set out in U.S. patent application Serial No. 44 268 dated June 8, 1970. These Application relates to a so-called flat slide in a pressure-balanced power steering pump. the Pump design has numerous parts and arrangements of these parts that are used in such pumps, namely the sliding ring, which is contoured to Hole on v / ei st, which forms it a Puinpenkammer, a Recessed rotor which is rotatably mounted within the sliding ring and which has a number of sliding bodies odor Pujiipeneleip.enton, which is radially

save

209822/0461

INSPECTED

Spares rotor can move and can pivot in the angular direction if they follow the adjacent bore wall of the pump chamber. With this structure sliding body springs are also provided with which the sliding body or pump elements to the outside against the The bore wall are preloaded and a housing is provided in which a shaft is rotatably mounted, by means of which the pump is driven by a drive and furthermore there is the usual shaft seal and the shaft bearing bush intended.

In the pump according to the invention, a housing is used which corresponds to that of the usual pumps, which however, it is shorter. An outlet port is in the housing einehraubt and designed in such a way that this connection serves as a guide for a valve or slide plate. The valve or slide plate according to the invention has a flat lower surface, a bore that leads to Receiving a guide on the outlet port is used and a check valve, which has a seat, a ball, a Has a spring and an adjustable plug.

A top plate is made of powder material by means of a Pressing process produced, -: in which two separate parts are pressed. These two parts are assembled and then sintered to join these parts together. This manufacturing technique enables a number of fanals can be produced in the upper plate without any special mechanical processing. It should be noted that the upper Plate can also be produced by other process technologies, for example by means of a casting or Molding process.

The channels formed in the top plate include pump outlet channels * The pressure medium flows from the pump through the outlet openings and then through the

209822/0461

Outlet channels in a centrally located chamber in one Section of the upper plate, this chamber being arranged next to the slide or valve plate.

Two inlet openings are also formed in the top plate, ao that the pressure medium from the area around around the slip ring through these inlet channels and then into the interior of the pump.

The top plate is further characterized in that a bypass opening and an auxiliary opening are provided. The upper and lower sections of the upper plate are designed so that the pressure medium is in a bypass ring flows and then into a bypass opening, wherein the oil flows past an additional opening in such a way that a suction effect is achieved. Due to this suction effect, pressure medium is passed through the additional opening and is thereby the pressure medium space around the slip ring and to the Pump inlet openings always very well filled or charged «

The upper side of the upper portion of the plate has an inner ridge which surrounds the central bore and an outer ridge that extends around the outer periphery of the top plate.

A bypass ring is formed between these webs. The inner ridge seals against the adjacent surface the slide or valve plate until the pressure medium, which flows through an opening, is released from the central bore leads into a chamber, such a flow forms that is sufficient that a sufficient Pressure drop is formed so that the valve plate is raised against the force of a spring. Through this pressure medium is fed from the centrally located bore into the bypass ring and then through the bypass channel

_{Λ Λ} ^ _Λ through

209822/046 1 ~~ - "-

through and past the additional channel.

The invention is to be explained in the following description with reference to the figures of the drawing. Ea show:

Fig. 1 is a sectional view of a pressure-balanced power steering pump, which is formed according to the invention, wherein the section along the line I-I of Fig. 2 is taken

Fig. 2 is a sectional view taken along the line II-II

of Fig. 1,

Fig * 3 is a composite sectional view in which the right section along the line IIIR-IIIR of the Fig. 2 is taken and a left-hand section along the line IIIL-IIIL of Fig. 2,

Fig. 4 is a sectional view taken along the line IY-IT of Figs. 2 and

Fig. 5 is a partial sectional view of another embodiment.

Although the technical teaching of the invention is quite general "is applicable, this technical teaching can be with special Advantageously used with a pressure-balanced power steering pipe which is shown generally in FIG. 10 at 1. The pump 10 has a housing 11 in which a bore 12 is formed. In a bearing sleeve 13 in the bore 12, a shaft 14 is rotatably mounted, which with can be connected to a drive, for example to the drive system of a motor vehicle. A shaft seal is shown at 16 and the housing has a radially outwardly widened portion 17 which is formed in this way is that this work together with a container can that on the outer wall 18 of the housing 11 can be feathered.

The 209 82 2/0461

The shaft 14 has a coupling section 19 which is keyed to the rotor 20 of a positive displacement pump. at This special embodiment of the pump can use the positive displacement device have the form of a sliding body pump, in which the rotor 20 has a number of TJmfangsausnehmungen each of which carries a sliding body or a pump element which can pivot in the angular direction can and can move radially when following against the adjacent bore wall. The bore wall xing is shown at 21 as the wall of a pump chamber which is formed by a sliding ring 22.

The parts of the pump are assembled in the axial direction and form a component in a housing section 25 is arranged and by two screw bolts 24 and 26 is held together, which are screwed into threaded bores 27 which are formed in the housing 11 are.

According to the invention, the housing section 23 is designed like the previous ones, but somewhat shorter. The housing section 23 is generally cap-shaped and has an end wall 28 and side walls 29, at the end of which a flange 30 extending radially outward is arranged. An outlet connection is shown at 31 and has a nipple 32 with an external thread, by means of which the outlet connection 31 can be connected to a pipe system which leads to a consumption point. The outlet connection 31 extends through an opening 33 _f which is formed in the wall of the housing 23 and this connection is attached to the housing 23 by means of a welded connection 34.

The hollow interior of the Gclrtuses 23 iat shown at 36. A cylindrical one extends into the hollow interior 36

209822/0 U 61

third extension 37 "which is formed at the outlet connection 31 is. This approach is designed so that this serves as a guide for a slide plate 40. The peripheral wall of the cylindrical extension 37 is as "shown at 38, recessed and this recess takes an O-ring seal 39. Axially through the outlet port 31 a bore 41 extends therethrough, which forms an exit s channel and which has a depression at 42. This forms a shoulder 43 against which one end of a spring $ 4 rests.

The slide plate 40 is generally a. disc-shaped Component that has a flat lower bull surface 46 has. The slide plate 40 has a widened Approach in which an outlet chamber A is arranged is, which is surrounded by a cylindrical wall 47 · on which the cylindrical portion 37 of the outlet extension 31 slides. The bottom wall of chamber A is shown at 48, and against this bottom wall it lies the other end of the spring 44. In this way, the slide plate 40 is in the axial direction from the outlet connection 31 continued, pre-tensioned.

The control surface 46 is a central recess at 49 and a flow passage is formed at 50 " Through this flow outlet, pressure medium is in the chamber A is introduced and from there into the channel 41 and this pressure medium is conveyed to a Terbrauchastelle.

A check valve is arranged in the slide plate 40. In this slide plate a radially outwardly extending channel 51 is formed, d «r the Wall 47 cuts and communicates with chamber A. The channel 51 is gradually widened and receives a valve valve member 52 through which a valve seat

209822/0 4 61

seat is formed by a ball valve 53 which is pretensioned by means of a spring 54. The other end the spring rests against a screw plug 56. The check valve adjusting very dust plug 56 is a deep-drawn cap into which threads are rolled on the outer circumference. In the end wall of this cap is a Hexagonal bore 57 is formed which cooperates with a hexagonal tool to adjust the cap axially. In this way, the check valve can be adjusted as desired. A check valve port 58 is formed in the housing 23 directly next to the check valve and via this opening pressure medium can be fed back into the container which surrounds the housing 23.

The top plate of the assembly of the present invention is shown at 60 and these are two separate ones Parts comprising an upper section 61 and a lower section 62. Though the top plate 60 can be produced by means of any known casting process, it is in particular according to the invention provided that the top plate is made of powder metal by separating the two Parts 61 and 62 are produced by means of a pressing process. Then the parts are put together and sintered together, with a joint 63 results. In this manufacture of the top plate 60, a number of channels can be formed therein Plate can be formed without any special machining is required.

Regarding the channels formed in the top plate 60, refer to the sectional view in Fig. referenced, the section being through the lower section 62 is passed and this section outlet

openings

209822/0461

openings 64 and 66 shows. The right portion of the figure is a section through one of the outlet ports 66 and it it should be noted that the other outlet opening is designed in the same way. From the outlet port 66 comes the Pressure medium through an outlet channel 67 »the one in the lower Section 62 is formed, and this channel extends upwardly into a centrally located bore B, which is formed in the upper portion 61 of the upper plate 60. In a sliding body pump are for relief of the recesses behind the sliding body in the front section of the pump 'auxiliary channels are provided, shown at 67a are.

In the in Pig. 2, two circumferential inlet openings 68 and 69 are also shown. The left section of the pig. 3 is a section through inlet port 69 and it should be noted that the other inlet port is designed in the same way. As shown, the pressure medium occurs in the area around the sliding ring 22 around into an inlet opening 69 and from there into the interior of the pump and fills the pump chamber between two adjacent sliding bodies. To fill the entire space there is a channel 70 with an auxiliary inlet channel 69a in connection, which is arranged radially inward of the main inlet openings 68 and 69 and serves to the Support filling of the inlet areas.

It was also on Pig. 2 referred to. In Fig. 2 is a bypass opening 71 is shown and an additional opening 72 is formed in the housing 23.

The one in Pig. The sectional view shown in Fig. 4 is a section through the bypass opening 71 and it can be seen that the upper plate 60 has an additional channel 73, which under is arranged at such an angle that a muzzle slope is formed, which with the additional opening 72

flo 209822 / 0Λ6 1

is aligned, with this channel intersecting the bypass channel 71, which extends inward and upward relative to top plate 60.

The upper side of the upper portion 61 of the top plate 60 has an inner web portion 76 that the Chamber B surrounds and an outer web portion 77 »the is arranged on the outer periphery of the top plate 60. A recess 78 is provided in the slide plate 40, to release the web 77. A bypass ring 79 is in the upper section 61 between the webs 76 and 77 intended.

Like Pig. 4 shows, the additional opening 71 forms a single channel, which cuts the bypass ring 79. The top and bottom portions 61 and 62 of the top plate 60 are designed such that the pressure medium flows from the bypass ring 79 into the bypass opening 71 and then to the Additional opening and the additional channel 72, 73 over and through a suction effect is achieved by means of which liquid is sucked in through the additional opening 72. Through this the area around the sliding ring 22 is filled around, whereby a good filling at the pump inlet ports 68 and 69 is achieved.

The inner web 76 seals against the slide surface 46 of the slide plate 40 until the pressure medium, which through the opening 50 from the chamber B into the chamber A flows, is sufficient to produce a sufficient pressure drop so that the slide plate 40 against the Force of the spring 44 is raised. As a result, pressure medium is diverted from the chamber B into the bypass ring 79 and then through the opening 71 and the channel 73, as has already been explained.

In

209822/0461

In Pig. 5 shows another embodiment that generally corresponds to that already described, with the exception that a lead metal ring 8 on the slide plate is pressed on and surrounds the upper plate in order to keep the pressure medium in the bypass ring. This will continue the suction effect and the pressure filling support. In this figure, the same reference numbers are followed by the letter ä used. It should be noted that the outer periphery of the upper portion 61a is recessed to receive the ring 80 "

It should also be noted that the outer web 77 on the top plate 60 is a boundary for the bypass ring 79 forms and secondly carries the part when the top surface is sanded or lapped to a maximum Achieve flatness at the inner web 76 au.

Claims

9 822/0461

Claims (1)

Claims Bruckabgeglichcne Servolenkungapurape with a housing, a G-guide ring, a rotor, sliders and a 'wave _$ characterized in that a cup-shaped capsule is provided, which is attached to the housing ", and which includes the parts of the pump that an outlet port at the Kipael is arranged, through which the pumped pressure medium is supplied to a consumer, that the outlet connection has a cylindrical section which extends into the interior of the capsule, that a valve plate has a bore which receives this cylindrical section of the outlet connection and is guided on this is that the valve plate and the outlet connection together form a chamber within the cylindrical portion to which pressure medium is supplied from the pump. Pressure balanced power steering pump according to claim 1, characterized in that a channel is formed in the valve plate which extends radially from the chamber naoh outside extends that in this channel a seat, a ball, a spring and an adjustable stopper arranged oind, which form a check valve, by means of which excess pressure medium in the chamber is fed to a reduced pressure area. Pressure-balanced power steering pump with a housing, a sliding ring, an eotor and with sliding bodies and a shaft, characterized in that a valve plate is provided in which a chamber is formed, dtp pressure medium is supplied from the pump that the Vc-ntilplattc a flat one VentiXoberflache has that an upper plate is provided, which has a first and second section, in which a row of channels are formed, wherein the channels AuslaP- channels include Abocjinit-c _and Cciien Druolnuittcl by dor Pu.ir .pu KUßelün ^ t being, dicsoc pressure Mit_tr \ l. 209822/046 1 by means of a central bore in the second part which lies opposite the flat surface of the valve plate and wherein the second part of the top plate adjacent to the flat valve surface has an inner ridge surrounding this central bore and an outer ridge surrounding the outer periphery , wherein a bypass ring is provided between these webs, and wherein the valve plate has an opening between the central bore and the said chamber and wherein a pretensioning device is provided by means of which the valve plate is pressed against the upper plate, the inner web sealingly against the Valve plate surface is applied until the flow through this opening is sufficient to increase the pressure drop such that the valve plate is raised against the action of the biasing device, whereby pressure medium is discharged into the bypass ring and wherein the upper plate has inlet channels, through the pressure medium from an area to the Sliding ring of the pump flows around into the pump and wherein the upper plate has a bypass opening and an additional opening which are arranged to each other in such a way that the pressure medium flows from the bypass ring into the bypass opening and then past the additional or kach filling opening, creating a suction effect , diirch the pressure medium is passed through the additional opening in order to fill the area around the sliding ring at the inlet openings. Pressure balanced power steering pump with assembled Parts comprising a valve plate and a slide ring which forms a pump casing, characterized in that, that a top plate is provided which consists of two separate parts which are connected to one another. are welded, and in which a centrally arranged bore is arranged, with an inner web this drilling 209822/0461 Bore surrounds and wherein an outer ridge surrounds the outer periphery of the top plate and with a ring between these webs is formed, and with a bypass channel in the upper plate, through the pressure medium is returned from the ring to the pump inlet, the pressure medium being discharged into the ring when the inner web is always separated from the adjacent surface of the valve plate. Pressure balanced power steering pump with compound Parts comprising a valve plate and a slip ring forming a pump chamber therethrough characterized in that a top plate is provided which consists of two separate parts which are connected to one another are welded and in which a centrally arranged bore is arranged that an inner web the bore surrounds that a ring is arranged outside of this web, that a closure outside around dieöen Ring is arranged around, with which the liquid is held in the ring, that a bypass channel is arranged in the upper plate, through the pressure medium Pump inlet is supplied, whereby pressure medium conveyed by the pump, which is supplied to the bore is selectively dispensed into the ring whenever the inner land is from the adjacent surface the valve plate is separated. Pressure-balanced power steering pump according to claim 5 » characterized in that the closure has an outer web on the outer diameter of the top plate, which forms a boundary of the ring and which partially supports the top plate when the top surface is abraded or lapped to achieve maximum flatness on the inner web. Pressure balanced power steering pump according to claim 5, characterized in that the closure has a circumferential direction has extending ring, which with the Valve plate 209822/0461 Valve plate is connected, and the the top plate surrounds to keep the pressure medium in the ring " 8, pressure-compensated power steering pump according to claim 5, characterized in that the bypass channel has a bypass opening and has an IT refill opening in the upper plate are arranged in such a way that the pressure medium which flows into the bypass opening, at the laugh filling opening flows past in such a way that a suction effect is generated, by means of which pressure medium is sucked in from the additional opening, whereby - the inlet area Pump is filled. 9 * Pressure balanced power steering pump with compound Parts comprising a slide plate and a sliding ring which forms a pump chamber, characterized in that an upper plate is provided in the a bypass ring is formed which receives diverted pressure medium that a bypass opening and a refill opening are formed in this plate and so arranged bind that pressure medium, which from the bypass ring flows into the bypass opening, flows past the refill opening, creating a suction effect is ,, the pressure medium sucks from the refill opening, whereby the inlet area of the pump is filled. 20982270461 Lee J? rse ite