DE19820136A1 - Piston pump for hydraulic anti-slip braking systems - Google Patents

Abstract

The suction valve (12) and pressure valve (11) are formed on an independently handled structural element (8) fixed in the piston pump housing (2). A common spring element pretensions both the pressure and suction valve. The structural element can have a valve seat body containing a valve seat for the pressure valve and a valve seat for the suction valve. An independent claim describes a pressure valve with clamp fixable on valve seat body having a tongue pre-tensioning valve body against valve seat.

Description

The present invention relates to a piston pump, especially for use in hydraulic, slip control ten brake systems, according to the preamble of the claim 1.

Such a piston pump is, for example, from EP 0 631 050 B1 known. The piston pump according to this state of the Technology has a pressure valve and a suction valve that both locally and structurally separated, in one Pump housing are arranged. The well-known pressure and suction valves are also pumped one after the other housing installed and can not in the installed state can be checked more easily. But also before Installation is difficult to optimally check the valves Lich, since in this case the conditions in the built-in door should be simulated as accurately as possible and the valves could only be checked separately.

In particular from the exemplary embodiments of a known piston pump disclosed in connection with FIGS. 11 to 19 of EP 0 631 050 B1, a pressure valve formed as a ball valve is known, in which a valve body formed as a ball against a valve seat formed as a radial bore Use of a ring material is stretched before. This known pressure valve has disadvantages in that the assembly of the ring material on the valve seat body of the pressure valve is complex and its fastening is not particularly stable. Furthermore, in this known arrangement, twisting or moving the ring material and thus slipping out of the ball from the valve seat or changing the biasing force is possible.

The object of the present invention is that Avoid disadvantages of the prior art, and in particular to create a piston pump in which both the pressure valve as well as the suction valve before installation in a pump housing, d. H. external, pre-assembled and can be checked.

This object of the invention is in a generic Piston pump solved in that the pressure valve and the suction valve on an independently manageable component forms are.

A major advantage of the present invention is in that by the inventive design of the pressure valve and the suction valve an externally preassembled and testable valve cartridge unit is created. In addition, NEN the number of parts used and the reject of defective units and thus the manufacturing costs ge be lowered. It is also advantageous in the invention that the time for the assembly of the piston pump according to the invention is significantly reduced, which also reduces costs be lowered. Due to the structural summary of printing and Suction valve also results in a saving in terms of roughness as well as optimal use of the in the pump housing available space for the valves. Finally, the structural summary of pressure and suction valve one multiple holes in the valve seat body as there are no separate ones Valves must be housed in the pump body.

In a preferred embodiment of the invention that is Component in the pump housing by caulking or Ver  clinchung attached. This type of attachment is inexpensive stig and enables a pressure-tight installation of the component in the pump housing. It also creates opportunities manipulation of the brake system by unauthorized persons limits.

To reduce the required to assemble the component Chen number of parts, it is advantageous to preload the pressure valve and the suction valve a common spring element watch. This can be a compression spring or a tension spring be educated.

The component advantageously has a valve seat body per on, in which a valve seat for the pressure valve and a Valve seat is designed for the suction valve. This gives a particularly space-saving and material-saving training of the component of the piston pump according to the invention.

According to a further embodiment of the invention, the Piston pump a pump piston designed as a pot piston on, the component having an axially outstanding mandrel has section through which the pot piston is guided. A The advantage of this embodiment is that the pump pen housing no longer needs to be hardened or anodized.

The component advantageously has a valve seat body per with one formed on one end face, axial recess in which the pump piston of the piston pump is guided or immersed. Preferably the suction valve on the other, opposite end of the Valve seat body essentially axially and the pressure valve essentially radially to the central axis of the valve seat body arranged. This arrangement is particularly space-saving because  the pump piston with its return spring in the freely rotated Recess can dip, reducing the length of the barrel bore of the pump piston is shortened.

According to a variant of the invention, the suction valve has a Compression spring, which is secured with a spring cup, whereby the spring cup a stop designed for the Ven Tilkörper of the suction valve, and wherein the spring cup furthermore means for guiding the compression spring and means for guiding tion of a piston used to reset the piston has return spring. The spring pot therefore combines several different functions, what a space and material saving means. Furthermore, by training the An the suction valve body is jammed valve body in the spring cup prevented.

The means for guiding the compression spring are advantageous and means for guiding the piston return spring in a pot ger section of the spring cup, being on the inside of the pot-like section the compression spring and on the outside of the pot-like section guided the piston return spring is. The stop of the spring cup is preferably used as an internal guide for the compression spring. This is especially true partial because the spring cup due to its function as Holding cage for the suction valve body essentially anyway concave, d. H. is provided with a pot-like section, and also because the spring cup is preferably an anyway has impact to clamp the suction valve closing body to prevent pers in the spring pot.

According to the invention is also a pressure valve with a Valve seat body, especially for a piston pump hen, with a valve body of the pressure valve by a the valve seat body attachable bracket against egg NEN, biased valve seat formed in the valve seat body  is, and wherein the clip member is particularly advantageous has tongue formed there against the valve body preloads the valve seat. The use of the tongue instead of a coil spring, for example possible because the opening pressure at the pressure valve not as exact as with the suction valve. Therefore, the coil spring in the pressure valve by a Clamp element trained tongue can be provided. By the tongue becomes the valve body perpendicular to the valve seat pressed, while the valve body in axial and radial direction is fixed. By possibly additionally formed in the tongue hole in which the The valve body engages at least partially, the fixie tion of the valve body can still be improved. Also offers the formation of the tongue on the bracket element also the front part that the spring force - even with given training of the valve body - adjusted over the length of the tongue can be. Finally, the tongue offers training in the clamp element has sufficient surface contact between rule the bracket element and the valve seat body, namely through the surfaces adjacent to the tongue, which makes the Clamp element much better on the valve seat body is attachable.

Preferably, the clip element has one towards the tongue vertically designed tab for fastening the clip elements on the valve seat body. This allows a ver turn and largely avoided loosening of the clamp element become.

In a preferred embodiment of the invention, this Clamping element at least one, parallel to the tongue formed tab for fastening the clamp element in a,  for receiving the valve body serving recess in the Valve seat body. This does not make a separate hole in the valve seat body required to attach the tab.

If the bracket element is much wider than the valve body is formed due to the larger Contact surface between the clamp element and the valve seat body an improved one, just by the tension of the staple caused caused attachment of the bracket element on the Valve seat body.

For the radial placement of the clamp element on the valve To facilitate the seat body, the clamp element is preferred end portions curved outwards on its transverse sides on. However, the attachment can also be axial from one end cut out of the valve seat body.

The invention and other advantages and refinements of the the same will be described below with reference to the Drawings explained. The same or similar reference numerals in the drawings denote the same or corresponding ones Elements. It should be noted that in the following figures description in particular on the differences of the various which embodiments are discussed. With regard to the Commonalities are therefore generally described in advance Reference examples. In the drawings gene:

Fig. 1 is a longitudinal sectional view of a first embodiment of the present invention;

Fig. 2 is a longitudinal sectional view of a second embodiment of the present invention;

Fig. 3 is a longitudinal sectional view of a third embodiment of the present invention;

Fig. 4 is a longitudinal sectional view of a fourth embodiment example of the present invention

Fig. 5 is a longitudinal sectional view of a fifth embodiment of the present invention;

Fig. 6 is a longitudinal sectional view of a sixth exporting approximately example of the present invention;

Fig. 7 is a longitudinal sectional view of a seventh embodiment of the present invention;

Fig. 8 is a longitudinal sectional view of an eighth embodiment of the present invention;

FIG. 9 shows a cross-sectional view of a pressure valve according to the invention along the line IX-IX of FIG. 8;

FIG. 10 is a longitudinal sectional view of a ninth exporting approximately example of the present invention;

FIG. 11 is a cross-sectional view of a further embodiment of a pressure valve according to the invention along the line XI-XI of FIG. 10;

FIG. 12 is a longitudinal sectional view of a tenth exporting approximately example of the present invention;

FIG. 13 is a cross-sectional view of a further embodiment of a pressure valve according to the invention along the line XIII-XIII of FIG. 12;

Fig. 14 is a longitudinal sectional view of an eleventh embodiment example of the present invention;

15 is a perspective view of a retaining clip for use in the inventive pressure valve according to Fig. 14.; and

FIG. 16 is a cross-sectional view along the line XVI-XVI of FIG. 14 with a preferred embodiment of a pressure valve according to the invention.

In Fig. 1 is a longitudinal sectional view of a first exemplary embodiment of a hydraulic or piston pump 1 according to the invention, which is preferably for use in an ABS (anti-lock braking system), ASR (traction control system) or ESP (electronic stability) -Program) system for a controlled vehicle brake. The Hydraulikpum pe 1 , which is a piston pump by design, has in its housing 2 a driven by a drive shaft 3 eccentric 4 . In this embodiment, a pump piston 6 is connected via a coupling ring 5 to a second pump piston, not shown, and thus is attached to the eccentric 4 . During the rotation of the drive shaft 3 , the pump piston 6 is moved linearly back and forth in a stepped bore 7 of the pump housing 2 . The stepped bore 7 is in IH rem the eccentric 4 opposite end by a component 8 , such as a cartridge, pressure-tight ver closed. The cartridge 8 is fastened in the pump housing 2 , for example by caulking or clinching. Outside the cartridge or the component 8 , an outwardly curved cover 9 forms a pressure damping chamber 10 . According to the invention, the cartridge 8 has a pressure-controlled pressure valve 11 and a pressure-controlled suction valve 12 . The valve cartridge 8 can be preassembled and checked outside the valve block or the pump housing 2 . The pressure valve 11 has a valve seat body 13 . The valve seat body 13 has a central bore 14 , the central axis M coincides with the longitudinal axis of the pump piston 6 . The central bore 14 of the valve seat body 13 has three stepped sections 15 , 16 and 17 from the outside inwards. The diameter of the outermost section 15 is larger than the diameter of the middle section 16 , the latter in turn being larger than that of the innermost section 17 . The valve seat body 13 has an outer Endab section 18 and an opposite, sleeve-shaped, in Neren end portion 19 . In the end section 18 , the stepped sections 15 , 16 and part of the stepped section 17 from the bore 14 are formed. The sleeve-shaped end portion 19 of the valve seat body 13 also has a part of the stepped portion 17 of the bore 14 . The end portion 18 of the valve seat body 13 has a, ent long formed its outer periphery annular channel 20 , which leads via a schematically indicated bore 21 to a low-pressure accumulator, not shown. A bore 22 running obliquely to the axis M connects the ring channel 20 to a space 23 delimited by the piston 6 when the suction valve 12 is open. Since the end section 19 of the valve seat body 13 projects into the space 23 . The end of the end portion 19 of the valve seat body 13 facing the piston 6 is bent outwards in order to accommodate a retaining ring 24 placed on the end portion 19 . A compression spring 25 is supported on the one hand on a step formed on the retaining ring 24 and on the other hand on a step formed on a valve element 26 of the suction valve 12 . The valve element 26 serves as the closing body of the suction valve 12 and is biased by the compression spring 25 against its seat, ie one of the end faces of the valve seat body 13 facing the piston 6 , radially outside of the end section 19 . In this position of the suction valve 12 , the space 23 is not connected to the low pressure accumulator. A step between the sections 16 and 17 of the bore 14 bil det a valve seat for a preferably formed as a ball 27 valve element of the pressure valve 11th The ball 27 is biased against its seat by a compression spring 28 , the end of the compression spring 28 opposite the ball 27 being supported by a plug 29 arranged in the bore 14 . The plug 29 has an inwardly projecting pin part 30 for guiding the compression spring 28 , the outer diameter of which corresponds approximately to the inner diameter of the compression spring 28 .

During the operation of the hydraulic pump 1 according to the invention, in a pressure stroke phase in which the pump piston 6 moves to the right according to the view in FIG. 1, the pressure of brake fluid in the space 23 is increased. For this purpose, a seal 31 is seen circumferentially around the pump piston 6 . The pressurized brake fluid in the space 23 now presses the ball 27 against the bias of the compression spring 28 away from its seat, whereby de pressurized brake fluid is transferred to a pressure medium consumer, for example the wheel brakes. In a suction phase, during which the pump piston 6 moves to the left according to the view of FIG. 1, the pressure valve 11 remains closed, ie the ball 27 is formed by the action of the compression spring 28 against its at the interface of the sections 16 and 17 Valve seat pressed. During this suction stroke phase, the suction valve 12 is opened by the relative pressure reduction of the brake fluid speed in the pressure chamber 23 . Then pressure medium is sucked into the pressure chamber 23 via the low-pressure accumulator, the bore 21 , the annular channel 20 and the bore 21 .

In Fig. 2 is a longitudinal sectional view of a second exemplary embodiment from the present invention is shown. In contrast to the first embodiment of the present invention already described in connection with FIG. 1, the embodiment according to FIG. 2 has a different design of the cartridge 8 . The suction valve 12 of the cartridge 8 according to the second exemplary embodiment of the present invention shown in FIG. 2, like the pressure valve 11, is designed as a ball valve, the arrangement of the suction valve 12 in the cartridge 8 being approximately perpendicular to that of the pressure valve 11 . The cartridge 8 therefore has a stepped radial bore 32 in addition to the axial bore 14 provided for the pressure valve 11 . A ball 33 serving as a valve body, which is biased by a compression spring 34 against a step formed in the radial bore 32 , is the closing body of the suction valve 12 .

In Fig. 3, a longitudinal sectional view of a third embodiment of the present invention is shown. In general, the structure of Hy shown in Fig. 3 is draulikpumpe 1 the construction of the hydraulic pump 1 already described in connection with FIGS. 1 and 2 similar. However, the essential differences between the third exemplary embodiment of the invention shown in FIG. 3 and the first two exemplary embodiments of the invention lie in the structure of the cartridge 8 . A pressure valve 41 and a suction valve 42 are structurally combined in the cartridge 8 . The pressure valve 41 has as a valve body instead of the ball 27 (see FIGS. 1 and 2) a conically shaped valve tappet 43 , which is preferably made of steel or plastic and by a tension spring 44 against its valve seat, ie a central bore 45 , is biased in the valve seat body 46 of the Druckven valve 41 . The tension spring 44 is attached at one end to a fastening eyelet or the like of the valve lifter 43 . At its opposite end, the tension spring 44 is connected via a holding element 47 with a substantially conical (lower half of the picture) or flat (upper half of the picture) formed closing body 48 , which is a ring made of plastic, of the suction valve 42 . In the third embodiment of the present invention shown in FIG. 3, therefore, only a single spring means, namely the tension spring 44 , is provided for prestressing the valve tappet 43 of the pressure valve 41 and the closing body 48 of the suction valve 42 .

A fourth embodiment of the present invention will be described in connection with FIG. 4. The fourth exemplary embodiment of the present invention shown in FIG. 4 in a longitudinal sectional view is generally similar to the third exemplary embodiment of the invention shown in FIG. 3. However, the structure of the valves combined in the valve cartridge 8 , namely the pressure valve 41 and the suction valve 42 , differs from the variants of the invention described above. The pressure valve 41 has a valve seat body 46 with a central bore 45 , which serves on the outside as a seat for a valve tappet 53 . The valve tappet 53 , which is preferably made of steel or plastic, has a pin section 54 and two end sections 55 , 56 which flare out conically. The end section 55 serves as a valve body for the pressure valve 41 (cf. the valve tappet 43 according to FIG. 3), while the end section 56 serves for mounting the valve tappet 53 in a central bore 57 of a holding plate 58 . A particularly inwardly curved outer peripheral portion 59 of the holding plate 58 is provided for mounting a compression spring 60 formed as a coil spring. The suction valve 42 has an annular closing body 61 , which is made of plastic. The closing body 61 comprises a central bore 62 , in which the valve tappet 53 runs. The closing body 61 of the suction valve 42 has on its, the pump piston 6 facing end face a ring-shaped step 63 , which serves to support and guide the compression spring 60 . On its end facing away from the pump piston 6 , the closing body 61 is conical or planar and bears against a corresponding valve seat formed in the valve body 46 in the closed state of the suction valve 42 . The compression spring 60 presses the closing body 61 of the suction valve 42 against its seat to bias the suction valve 42 in the closed state, and also presses the end portion 55 of the valve lifter 53 against its seat to bias the pressure valve 41 in the closed state. If the pump piston 6 moves to the right during a pressure stroke as shown in FIG. 4, the pressurized brake fluid opens the pressure valve 41 . The hydraulic pressure of the brake fluid acts against the biasing force of the compression spring 60 . If the pump piston 6 moves to the left during a suction stroke phase according to the view of FIG. 4, the relative negative pressure that arises in the chamber 64 ensures the opening of the suction valve 42 against the biasing force of the compression spring 60 .

It should be noted that the third and fourth exemplary embodiments of the present invention shown in FIGS. 3 and 4 are advantageous in that only one spring element is required for both the pressure valve 41 and the suction valve 42 . Compared with the exporting approximately examples FIGS according. 1 and 2 is therefore saved a spring, so that the (valve) cartridge 8 according to the third and fourth embodiments, only five components, namely the valve seat body 46, the closing body 48 or 61, Holding element 47 or the holding plate 58 , the tension spring 44 or the compression spring 60 and the valve lifter 43 or 53 has.

In Fig. 5 is a longitudinal sectional view of a fifth exemplary embodiment from the present invention is shown. The structure of the valve cartridge 8 according to FIG. 5 is generally similar to the structure of the valve cartridge 8 according to the second exemplary embodiment described in connection with FIG. 2. This applies in particular to the extent that the cartridge 8 has an axially formed pressure valve 11 and a suction valve 12 formed radially thereto at one end section. In contrast to the embodiment shown in FIG. 2, the Pa trone 8 has a valve seat body 70 which has an inwardly or towards the eccentric 4 formed mandrel 71 , which is preferably made of steel before. A circumferential groove 72 is formed on the mandrel 71 and serves to receive a sealing ring 73rd A stepped bore 74 is formed on the end face of the mandrel 71 in FIG. 5, which serves to receive a compression spring or piston return spring 75 and forms a space 76 . The pump piston driven by the eccentric 4 is designed as a pot piston 77 . The pot piston 77 has a bore 78 , the inside diameter of which corresponds approximately to the outside diameter of the mandrel 71 . At a bottom portion of the bore 78 , an axial projection 79 is formed, the outer diameter of which corresponds essentially to the inner diameter of the compression spring 75 . The outer diameter of the projection 79 tapers slightly outwards in order to facilitate the installation of the compression spring 75 . The pot piston 77 is preferably made of steel and can, for example, be an extruded part. As a result, the play between the pot piston 77 and the mandrel 71 can be kept very low due to the approximately coefficient of expansion. Furthermore, the housing 2 no longer has to be anodized or hardened. Contamination by clipping or caulking the valves and closures is avoided. One takes the Fig. 5, that the pressure spring 75 within the pot-type piston 77, and more precisely in an out of the pot piston 77 and the mandrel 71 space formed 76 is located.

In the illustrated in Fig. 6 sixth embodiment of the present invention in contrast to the 5 shown in Fig. Fifth embodiment of the present invention is the compression spring 75, which serves for resetting the pot piston 77 against a recess formed on the outer side of the pot piston 77 stage stored. On its opposite side, the compression spring 75 is mounted and guided on a step of the valve seat body 70 formed by the attachment of the mandrel 71 . An axial bore 80 in the mandrel 71 is also used as a space or compression space 76 or in the exemplary embodiment according to FIG. 6.

It should be noted that in the embodiments of the present invention shown in FIGS. 5 and 6, in contrast to the embodiment examples shown in FIGS. 1 to 4, instead of the coupling ring 5 , the compression spring 75 for returning the pot piston 77 is provided.

In Fig. 7, a seventh embodiment of the present invention is shown schematically. The cartridge 8 shown in FIG. 7 has a pressure valve 81 and a suction valve 82 . The suction valve 82 formed in the center of the valve seat body has a valve body designed as a ball 83 , which in the closed state of the suction valve 82 rests on a valve seat formed on a bore 84 . The valve body can also be a plate or the like instead of the ball 83 . It should be noted that the cartridge 8 shown in FIG. 7 is essentially rotationally symmetrical, which simplifies production. The bore 84 is formed on an end face of the cartridge 8 axially centered. The bore 84 connects the pressure or compression space 85 with a channel 86 which leads to a (not shown) low-pressure accumulator. The ball 84 is held by a holding cage 87 . A compression spring 89 , which is provided between the pump piston 6 and a retaining ring 88 and is located essentially in the compression space 85 , ensures that the pump piston 6 is reset during operation. At the same time, the compression spring 89 serves to hold the retaining cage 87 via the retaining ring 88 to the bottom of the recess 90 forming the pressure chamber 85 in the cartridge 8. Preferably, however, the retaining ring 88 is also pressed into the cartridge or the component 8 . While in the off the suction valve forming example of FIG. 7 axially on the, the pump piston 6 opposite end of the cartridge 8 to be sorted, 81, the pressure relief valve as the closing body, an annular plate 92, which may for example be a set schlitzter ring made of plastic. The plate 92 is tensioned by a wire snap ring 93 against the cartridge 8 before, so that the pressure valve 81 in the closed state ensures a pressure medium seal between the compression space 85 and the channel 94 leading to a pressure medium consumer. One removes the representation of FIG. 7 that the Ven th is displayed tilsitzkörper the cartridge 8 for pressure-tight fitted in a pump housing with three, by the reference number C, clinch connections and caulking is provided. It should be noted that the game Ausführungsbei shown in Fig. 7 of the present invention is particularly geous in that the valve seat body of the cartridge 8 in its interior by the provision of the axially freely rotated compression space 85 is particularly space and material saving .

In connection with FIGS. 8 and 9 is an eighth exporting of the present invention, for example approximately explained. In Figs. 8 and 9 illustrated eighth embodiment of the present invention is the one similar to that shown generally in FIG. 7, the seventh embodiment of the vorlie constricting invention, but differs from this sentlichen in we characterized in that the pressure valve 81, a modified Has training. The pressure valve 81 according to FIGS. 8 and 9 has a valve body preferably formed as a ball 95 , which is ausgebil det in a radial bore 96 in a section of the cartridge 8 facing the pump piston 6 and made of a suitable material, preferably steel or plastic , consists. Radially outside the bore 96 , a circumferential groove 97 is formed in the cartridge 8 , which has a particularly conical section 98 at the location of the bore 96 . A bracket 99 , which acts as a leaf spring, serves to bias the ball 95 against its valve seat formed by the conical section 98 . The use of a leaf spring for the pressure valve 81 is half possible because the opening pressure of the pressure valve 81 does not have to be set as precisely as that of the suction valve 82 . There is therefore no need for a coil spring for the pressure valve 81 . In addition, the opening pressure of the pressure valve is not as critical as that of the suction valve, which is why the effective sealing seat diameter can be smaller. It can be seen in particular from the illustration in FIG. 9 that the holding bracket 99 , which extends essentially almost around the entire circumference of the cartridge 8 , has a perforation 100 at the location of the ball 95 . The perforation 100 is used to fix the ball 95 on the valve seat, so that after he followed assembly, the ball 95 can not slip out of the cartridge unit. The holding bracket 99 is fixed to the cartridge 8 in a form-fitting and / or frictional and non-positive manner, for example by the caulking C shown in FIG. 9, in order to prevent the bracket 99 from being rotated. It should be noted that, as shown in FIG. 8, the cross section of the bore 84 is larger than that of the bore 96 , which is due to the fact that little throttling and thus a larger effective suction cross section is desirable for the suction valve 82 when the brake fluid is drawn in. In contrast to the embodiment described in connection with FIG. 7, the eighth embodiment of the present invention shown in FIG. 8 has between the holding cage 87 , which is preferably made of a sheet metal, which can also be referred to as a spring cup, and the ball 83 of the suction valve 82 has a compression spring 101 . As a result, the opening pressure of the suction valve 82 can be set exactly, ie without large tolerances. The holding cage 87 also serves - along its inner circumference - for guiding the compression spring 101 . The holding cage 87 is preferably pressed together with the compression spring 101 held frictionally in the holding cage 87 into the valve housing to the stop. The fixing of the holding cage 87 can alternatively by one or more in the valve housing or the cartridge 8 located undercuts and trained on the holding cage 87 he catches that engage in the undercuts (not shown). After mounting the suction valve 82 , the holding cage 87 - along its outer circumference - also serves to guide the piston return spring 104 . In order to ensure that the compression spring 101 cannot push out the holding cage 87 , the piston return spring 104 has a stronger spring force than the compression spring 101 . It should be noted that in the eighth exemplary embodiment of the present invention, the various pressure spaces take place by means of a clinch connection or a "pine cone-like" connection. No separate sealing elements are therefore required.

In Figs. 10 and 11 is shown schematically from a ninth exemplary implementation of the present invention. In contrast to the eighth embodiment of the present invention explained in connection with FIGS. 8 and 9, the retaining bracket 99 according to the ninth exemplary embodiment no longer has any perforations. This is advantageous because a possible skewing of the ball 95 is no longer possible. The ball 95 is pressed by the use of the bracket 99 according to the ninth embodiment always perpendicular to the valve seat formed on the bore 96 . A preferably rotationally symmetrical spring cup 102 is angeord net in the compression space 85 and has an annular, bent end portion 103 , which serves to support one side of the piston return spring 104 . On its other side, the piston return spring 104 abuts the pump piston 6 . In order to ensure a flow medium connection between the compression space 85 and the suction valve 82 , the spring cup 102 has a central, axial bore 105 . Another fluid connection is preferably provided on the circumference of the spring cup 102 , webs being formed on the circumference in a manner not shown, between which the pressure medium can flow. Furthermore, the spring cup 102 on the side facing the suction valve 82 has an annular recess 106 , which is used for mounting one side of the compression spring 101 of the suction valve 82 . A section 107 to the side of the suction valve 82 in which the bore 105 is formed and the outside of which corresponds to the inside of the recess 106 also serves as a stop for the suction valve body, ie for the ball 83 . It should be noted that the spring cup 102 shown in FIG. 10 is made of plastic, which results in a significantly simplified production compared with the holding cage 87 made of sheet metal according to the embodiment shown in FIG. 8. The ball 83 can not clamp cup 102 on the basis of the portion 107 of the spring in the otherwise conical spring cup 102nd

In Figs. 12 and 13, a tenth embodiment of the present invention is shown. In particular, the tenth embodiment of the present invention shown in FIGS. 12 and 13 differs from the eighth and ninth embodiments with respect to the construction of the pressure valve 81 . A sheet metal strip bent to a clamp 110 is provided as spring means for pressing the ball 95 against the valve seat of the pressure valve 81 . A tongue 111 according to the invention is worked out from the bracket 110 approximately in the center. By means of the tongue 111 , the ball 95 is pressed against its valve seat with a defined force. In order to avoid twisting of the clamp 110 , the clamp 110 here has two indented collar sections or loops 112 , 113 which engage in the groove 97 . As a result, the clamp 110 is fixed on the valve seat body. Furthermore, the clamp 110 has bent ends 114 , 115 on its two transverse sides, which facilitate the assembly of the clamp 110 , ie the mounting of the clamp 110 on the valve seat body.

An eleventh exemplary embodiment of the present invention is described below in connection with FIGS. 14 to 16, FIG. 16 representing a section through FIG. 14 along the line XVI-XVI. In contrast to the tenth embodiment of the present invention shown in FIGS . 12 and 13, the clip 120 has been considerably widened, it therefore extends on the outside of the cartridge 8 via the groove 97 in the direction of the center 4 . As a result of the widening on the clip 120 , the clip 120 is held on the cartridge 8 solely by its spring force. There are therefore no further measures such. B. by welding or caulking, required to attach the bracket 120 to the cartridge 8 . The ball 95 is pressed according to the invention by a tongue 121 ausgebil in the bracket 120 against its valve seat. It should be noted that the tongue 121 extends almost half the length of the bracket 120 . A tab 123 formed in a recess 122 on the end face of the clip 120 serves to fix the clip 120 on the cartridge 8 . It should be noted that, in contrast to the tenth embodiment, the fi xation in the eleventh embodiment of the clip 120 on the cartridge 8 shown in FIGS . 14 to 16 is substantially perpendicular to the spring action of the holding clip 120 . As a result, rotation of the clamp 120 on the cartridge 8 is largely excluded. Furthermore, according to the invention, the biasing force of the tongue 121 on the ball 95 can be determined more precisely. A bore 124 formed in the cartridge 8 is provided so that the tab 123 can be inserted therein and the clip 121 is prevented from slipping or twisting. In particular, the representation of FIG. 15 and 16 it can be seen that the clip 120 over half of the circumference of the cartridge 8, and preference, approximately over two thirds of the circumference of the cartridge 8, it stretches. Finally, it should be noted that the suction valve body 125 in the eleventh embodiment of the invention is hammer-shaped and is essentially conical or in the form of a spherical cap on its end serving as a closing body, the valve seat then also being conical or spherical. On its opposite end, the hammer-shaped valve body 125 preferably has an annular groove 126 for receiving and guiding the compression spring 101 serving as a suction valve spring.

Reference list

1

Hydraulic or piston pump

2nd

casing

3rd

drive shaft

4th

eccentric

5

Dome ring

6

Pump piston

7

drilling

8th

Cartridge or component

9

cover

10th

Pressure damping chamber

11

Pressure valve

12th

Suction valve

13

Valve seat body

14

drilling

15

section

16

section

17th

section

18th

End section

19th

End section

20th

Ring channel

21

drilling

22

drilling

23

room

24th

Retaining ring

25th

Compression spring

26

Valve element

27

Valve element or ball

28

Compression spring

29

Plug

30th

Pin part

31

poetry

32

Radial bore

33

Valve body or ball

34

Compression spring

41

Pressure valve

42

Suction valve

43

Valve lifter

44

Tension spring

45

drilling

46

Valve seat body

47

Holding element

48

Closing body

53

Valve lifter

54

Pin section

55

End section

56

End section

57

drilling

58

Retaining plate

59

Outer peripheral portion

60

Compression spring

61

Closing body

62

drilling

63

step

64

chamber

70

Valve seat body

71

mandrel

72

Circumferential groove

73

Sealing ring

74

drilling

75

Pressure or piston return spring

76

room

77

Pot piston

78

drilling

79

head Start

80

drilling

81

Pressure valve

82

Suction valve

83

Ball or valve body

84

drilling

85

Pressure or compression room

86

channel

87

Holding cage or spring cup

88

Retaining ring

89

Compression spring

90

Recess

92

plate

93

Wire snap ring

94

channel

95

Ball or valve body

96

drilling

97

Circumferential groove

98

section

99

Bracket

100

Perforation

101

Compression spring

102

Spring pot

103

End section

104

Piston return spring

105

drilling

106

Recess

107

section

110

Bracket

111

tongue

112

Waist section or flap

113

Waist section or flap

114

End section

115

End section

120

Bracket

121

tongue

122

Recess

123

Tab

124

drilling

125

Suction valve body

126

Ring groove
M central axis
C Clinch connection or caulking

Claims (16)

1. Piston pump ( 1 ), in particular for pressure medium delivery in hydraulic, slip-controlled brake systems, with a piston ( 6 ), a suction valve ( 12 ; 42 ; 82 ) and a pressure valve ( 11 ; 41 ; 81 ), characterized in that the suction valve ( 12 ; 42 ; 82 ) and the pressure valve ( 11 ; 41 ; 81 ) on an independently manageable component ( 8 ) are formed. 2. Piston pump ( 1 ) according to claim 1, characterized in that the component ( 8 ) in the housing ( 2 ) of the Kolbenpum pe ( 1 ) is fastened by caulking or clinching (C). 3. Piston pump ( 1 ) according to claim 1 or 2, characterized in that a common spring element ( 44 ; 60 ) is provided for biasing the pressure valve ( 41 ) and the suction valve ( 42 ). 4. Piston pump ( 1 ) according to one of claims 1 to 3, characterized in that the component ( 8 ) has a Ven valve seat body ( 13 ; 46 ; 70 ) in which a valve seat for the pressure valve ( 11 ; 41 ; 81 ) and a valve seat for the suction valve ( 12 ; 42 ; 82 ) is formed. 5. Piston pump ( 1 ) according to one of the preceding claims, characterized in that the pump piston ( 6 ) is designed as a pot piston ( 77 ), the component ( 8 ) having an axially projecting mandrel section ( 71 ) which in the pot piston ( 77 ) is performed. 6. Piston pump ( 1 ) according to one of claims 1 to 5, characterized in that the component ( 8 ) has a Ven valve seat body ( 46 ; 70 ) with an axial recess formed on one end face thereof, in which the pump piston ( 6 ) is performed. 7. Piston pump ( 1 ) according to claim 6, characterized in that the suction valve ( 82 ) on the opposite end face of the valve seat body ( 46 ; 70 ) is arranged substantially coaxially to the central axis (M) of the valve seat body ( 46 ; 70 ). 8. Piston pump ( 1 ) according to claim 6 or 7, characterized in that the pressure valve ( 81 ) is arranged substantially radi al to the central axis (M) of the valve seat body ( 46 ; 70 ). 9. Piston pump ( 1 ) according to one of the preceding claims, characterized in that the suction valve ( 82 ) has a compression spring ( 106 ) which is secured with a spring cup ( 102 ), the spring cup ( 102 ) having a stop formed thereon for the Valve body ( 83 ) of the suction valve ( 82 ), and wherein the spring cup ( 102 ) further comprises means for guiding the compression spring ( 106 ) and means for guiding a piston return spring ( 104 ). 10. Piston pump ( 1 ) according to claim 9, characterized in that the means for guiding the compression spring ( 106 ) and With tel for guiding the piston return spring ( 104 ) are a pot-like section of the spring cup ( 102 ), being on the inside of the pot-like Section, the compression spring ( 106 ) and on the outside of the pot-like section, the piston return spring ( 104 ) is guided. 11. Pressure valve ( 81 ) with a valve seat body ( 46 ; 70 ), in particular for a piston pump ( 1 ) according to one of the preceding claims, wherein a valve body ( 95 ) of the pressure valve ( 81 ) can be attached to the valve seat body ( 46 ; 70 ) Clamping element ( 99 ; 110 ; 120 ) is pretensioned against a valve seat formed in the valve seat body ( 46 ; 70 ), characterized in that the clamping element ( 99 ; 110 ; 120 ) has a protrusion formed thereon ( 111 ; 121 ) which the Preloads valve body ( 95 ) against the valve seat. 12. Pressure valve ( 81 ) according to claim 11, characterized in that the clamp element ( 99 ; 110 ; 120 ), to the tongue ( 111 ; 121 ) substantially perpendicularly designed tab ( 123 ) for fastening the clamp element ( 99 ; 110 ; 120 ) on the valve seat body ( 46 ; 70 ). 13. Pressure valve ( 81 ) according to claim 11, characterized in that the clip element ( 99 ; 110 ; 120 ) at least one parallel to the tongue ( 111 ; 121 ) formed tab ( 112 , 113 ) for fastening the clip element ( 99 ; 110 ; 120 ) in a recess for receiving the valve body ( 95 ) in the valve seat body ( 46 ; 70 ). 14. Pressure valve ( 81 ) according to one of claims 11 to 13, characterized in that the clamp element ( 99 ; 110 ; 120 ) is fixed by caulking (C) to the valve seat body by ( 46 ; 70 ). 15. Pressure valve ( 81 ) according to one of claims 11 to 14, characterized in that the clamp element ( 99 ; 110 ; 120 ) is substantially wider than the valve body ( 95 ). 16. Pressure valve ( 81 ) according to one of claims 11 to 15, characterized in that the clamp element ( 99 ; 110 ; 120 ) has on its transverse sides outwardly curved end portions ( 114 , 115 ).