WO2014124720A1

WO2014124720A1 - Assembly comprising a pump element and a fastening flange

Info

Publication number: WO2014124720A1
Application number: PCT/EP2013/078046
Authority: WO
Inventors: Waldemar Kiel; Hrvoje Lalic
Original assignee: Robert Bosch Gmbh
Priority date: 2013-02-18
Filing date: 2013-12-27
Publication date: 2014-08-21
Also published as: DE102013202569A1; EP2956667A1; EP2956667B1; CN104995404A; CN104995404B

Abstract

The invention relates to an assembly (10) comprising a pump element (11) and a fastening flange (12) for installation in a housing. According to the invention, the pump element (11) and the fastening flange (12) of the assembly (10) are separate from each other. The flange (12) has a central passage opening (50), which surrounds a head region (21) of the pump element (11) in the assembled state of the assembly (10), and also at least two retaining tabs (37) for fastening means fastened to the housing (22), which retaining tabs are symmetrically opposite each other with respect to the central passage opening (50). The pump element (11) has a spring (34), which acts on a ledge (35) formed on a lower region of the pump element (11) at one end and is designed to be supported on a stop within the opening of the housing (22) at the other end. The pump element (11) is accommodated and anchored in an opening of the housing (22) by means of either a flat or a curved profile of the fastening flange (12).

Description

title

Assembly comprising pumping element and mounting flange

description

The invention is based on an assembly comprising a pumping element and a mounting flange for installation in a housing according to the preamble of patent claim 1 and also of a housing for such an assembly.

In pumping elements of high-pressure pumps, which are provided for installation in a housing, for example in an internal combustion engine, a mounting flange is required to permanently connect such a pumping element to the housing. For this purpose, the outer body of the pumping element and the associated mounting flange is made in one piece as a forged part. The disadvantage here is that the subsequently required for the corresponding forging forming rework, for example by machining, is associated with relatively high production costs.

Advantages of the invention

The assembly with the characterizing features of claim 1 has the advantage that, in contrast to the prior art, in which the outer body of the pumping element and the mounting flange are designed integrated, by the present invention separately from each other making the pumping element and the associated mounting flange of the outer body of Cost-reducing pump element is designed as a rotating part of rod material with low Zerspannvolumen and the attachment of the pumping element by means of the formed separately from the outer body of the pumping element and on

Pump element mountable mounting flange takes place. Advantageously, the mounting flange can be manufactured from a cost-effective and from a suitable for the mechanical stress occurring during operation of the mounting flange material. Further advantageous developments and refinements of the invention will become apparent from the measures listed in the dependent claims.

In order to receive the pumping element in the fastening flange, the fastening flange has a central passage opening, which encloses a head region of the pumping element in the mounted state of the assembly. In this case, in the case of a substantially cylindrically shaped head region of the pumping element, the central passage opening of the fastening flange is of circular design. To attach the assembly to a housing, the mounting flange has at least two retaining lugs for fastening means, which lie opposite one another symmetrically relative to the central passage opening, on the housing.

An advantageous development of the invention provides that on the outer body of the pumping element, a circumferential shoulder on the outer circumference is formed, which

is larger in diameter than the head area and limits the head area axially downwards. As a result, the shoulder of the pumping element provides a bearing surface for the mounting flange mounted in the intended position on the pumping element.

An embodiment of the invention may be that the shoulder of the pumping element when installed in a housing cooperates with a shoulder of the housing. In the intended installation position of the module, the shoulder of the pumping element rests on the shoulder formed in the mouth region of the housing.

A preferred embodiment of the invention is that the pumping element comprises a spring, which acts on the one hand on a formed in the lower region of the pumping element paragraph and on the other hand is provided for support on a stop within the opening of the housing. The axial force generated by the spring acts upwards and presses the pumping element against the mounting flange. An embodiment of the invention is that the mounting flange rests flat on the shoulder of the pumping element. As a result, the mounting flange acts as a rigid element, which fixes the pumping element in the axial direction. A preferred and particularly advantageous embodiment of the invention, in which the mounting flange is designed elastically as a spring element or bending element, however, is that the mounting flange is curved away from the shoulder. The curvature between the central axis of the pumping element and the location of attachment of the mounting flange is formed on the housing. By adjusting the securing means penetrating the retaining tabs, bending of the arching is possible with corresponding constriction of an axial distance between retaining tabs and housing at the mounting location which is dependent on the bending, such that the mounting flange exerts an adjustable biasing force on the pumping element. The biasing force can thus be adjusted in this embodiment, depending on the pressure generated by the pumping element during operation, and indeed via the bending of the mounting flange. Due to the bending of the mounting flange, a relatively simple assembly of the assembly is made possible. In addition, the mounting flange exerts as a spring element or bending element from a downward axial force, so that the mounting flange presses against the shoulder of the pumping element. Advantageously, component tolerances in the axial direction can thereby be compensated. According to an expedient development of the mounting flange is formed of strip material, wherein individual lamellae of the strip material are stacked one above the other. To permanently anchor the assembly to the housing, each retaining tab has at least one through hole for receiving a respective associated fastener. Conveniently, the fastening means are designed as screws and anchored in corresponding holes in an outer side of the housing. According to an expedient embodiment of the invention, it is provided for supporting the pumping element in the housing opening, that the shoulder and the heel each carry a radially encircling sealing ring. Structural tolerances can be compensated thereby, so that the pumping element is received tightly in the housing opening. drawings

Embodiments of the invention are explained in more detail in the following description and in the accompanying drawings. The latter show in schematic views. 1 shows a longitudinal section through an assembly which comprises a pumping element and a mounting flange receiving the pumping element, wherein the left-hand part of FIG. 1 shows a first embodiment of the mounting flange, while the right-hand part shows a second embodiment of the mounting flange, FIG.

2 shows a cross section through a head region of the pumping element of FIG. 1 according to the first embodiment, wherein a cut side at the head region serves as a key surface for fixing an angular position of the pumping element, and FIG. 3 shows a top view of the housing-mounted assembly according to FIG second embodiment.

DESCRIPTION OF THE EMBODIMENTS FIG. 1 shows, in a longitudinal sectional view, an assembly according to the invention designated in its entirety by 10, which comprises a pumping element 11 and a fastening flange 12 receiving the pumping element. Here, the left half of Fig. 1 shows a first embodiment of the mounting flange 12, which is flat in profile and thus rests flat on the outside of a housing 22, while the right half of Fig. 1 shows a second embodiment of the mounting flange 12, the curved or arched in profile is formed. The assembly 10 is suitable for installation in a housing. In the intended assembled state of the assembly 10 surrounds in both embodiments of the mounting flange 12 with a centrally formed through hole 50, the head portion 21 of the pumping element 1 1, which is shown in the figures essentially on the basis of its outer body. For this purpose, the passage opening 50 of the mounting flange 12 is circular, wherein the diameter thereof corresponds approximately to the diameter of the cylindrical head portion 21 of the pumping element 1 1. For attachment of the mounting flange 12 on an abutment side 27 of the housing 22, the mounting flange 12 has two mutually symmetrically with respect to the Längsmittelach- se 24 oppositely arranged retaining tabs 37 with two through holes 23, which are arranged symmetrically to the longitudinal center axis 24 opposite each other and in each case a screw 25 therein receive, with which the mounting flange 12 can be anchored in two blind holes 26 which are formed corresponding to the arrangement of the through holes 23 on the abutment side 27 of the housing 22. The Pumping element 1 1 is accommodated in a housing opening 28 of the housing 22. By means of a circumferential groove on the outer circumference of a shoulder 30 of the pumping element 1 1 circumferential groove 31 is supported, the pumping element 1 1 in the mouth region of

Housing opening 28 and by means of a second thereto axially spaced sealing ring 32, the pumping element 1 1 is supported with its lower portion in the housing opening 28 from.

1 is characterized in that the mounting flange 12 has a planar profile and thus the mounting flange rests flat on the shoulder 30 of the pumping element 1 1, wherein the passage opening axially from the shoulder 30 extending upwards

smaller diameter head portion 21 encloses. Here, in the intended installation position of the assembly 10, the pumping element 1 1 sunk so far into the opening of the housing 22, that in this embodiment, the head portion 21 facing top of the shoulder 30 is aligned with the contact side 27 of the housing 22. In order to give the pumping element 1 1 axial support relative to the mounting flange 12, a spring 34 is provided in the lower region of the pumping element 1 1, which on the one hand on - not shown in the figure - bottom or a shoulder of the housing opening and on the other hand to a second sealing ring bearing shoulder 35 and thereby generates an axially upward vertical force, with which the shoulder 30 of the pumping element 1 1 is placed in abutment against the underside of the mounting flange 12. In this position, the mounting flange 12 is anchored by means of engaging in the blind holes 26 of the housing 22 screws 25 on the contact side 27 of the housing, that the bottom of the mounting flange is flush with the contact side 27. The vertical force generated by the spring 34 prevents axial displacement of the pumping element downwardly within the housing opening.

The second embodiment according to the right-hand side view of FIG. 1 is characterized in that the fastening flange 12 has a curvature or a curved profile that runs symmetrically to the longitudinal central axis 24 of the assembly 10. In this case, the profile is substantially curved like a trough, wherein the central region rests centrally on the shoulder 30 of the pumping element 1 1, while the off-center region is upwardly arched and thereby protrudes axially from the shoulder 30 and the contact side 27 axially spaced or. The inside of the mounting flange 12 formed through opening 50, with which the mounting flange 12, the head portion 21 of the pumping element 1 first encloses, therefore follows the curved profile, ie the passage opening of the mounting flange 12 does not extend within a definable plane. The holding tabs 37 disposed opposite one another symmetrically with respect to the longitudinal central axis 24 and the central area form the off-center and high-arched edge region of the fastening flange 12, each retaining tab being respectively provided with a through-bore 23 for receiving a respective screw 25, whereby the fastening flange 12 is inserted into the corresponding one Blind holes 26 in the housing 22 can be anchored. Due to the curved profile and this inherent spring force, it is possible by adjusting the screws 25 overcoming the spring force to produce a correspondingly variable deflection of the curved flange profile, whereby an adjustable and axially downward biasing force between the mounting flange 12, the shoulder 30 of the Pumping element 1 1 and the housing 22 is generated. By the shoulder 30 of the pumping element 1 1 according to the second embodiment has a larger diameter than that of the first embodiment and the mouth portion of the housing opening is formed larger than the axially underlying area, the underside of the shoulder 30, which according to the second embodiment as a diameter widening 33rd is formed on the thus formed in the vicinity of the mouth paragraph 38 in the housing opening. In this case, the first sealing ring 31 in the shoulder 30 seals against the inner circumference of the housing opening in the region of the mouth above the shoulder 38. In addition, of the in the lower part of the pumping element 1 1 at the formed there paragraph 35 with its one end acting spring 34, which at its other end in the opening of the housing to a wall portion such as a floor or a shoulder or at a deeper in the

Housing opening mounted and coupled to the pump element component such as a shaft supported, generates an axial vertical force upwards, which presses the shoulder 30 of the pumping element 1 1 against the underside of the mounting flange 12 in its central abutting the shoulder 30 central portion. By the mounting flange is designed in this embodiment as a bending element or bending beam, axial component tolerances are compensated.

The mounting flange 12 is preferably formed from strip material and may be formed of lamellar superimposed individual elements, which are each formed from the strip material, wherein the individual elements can be inexpensively designed as stampings. 2 shows a cross section through the pumping element 1 1 according to the first embodiment, wherein a key surface 40 is provided at the head region of the pumping element 1 1, which serves to define an angular position of the pumping element 1 1.

Fig. 3 illustrates in a plan view of the built-in housing 22 assembly

10 according to the second embodiment. In this case, protrudes the head portion 21 of the pumping element

1 1 from the central through hole 50 of the mounting flange 12 out and the retaining tabs 37 cross-screws 25 fix the mounting flange 12 to the housing 22. To save weight, the mounting flange 12 with the symmetrically opposite retaining tabs 37 an oval or elliptical shape on.

In summary, in an assembly 10, which comprises a pumping element 1 1 and a mounting flange 12 for installation in a housing, according to the invention provided that the pumping element 1 1 and the mounting flange 12 of the assembly 10 are carried out separately. The mounting flange 12 has a central passage opening 50, which encloses a head portion 21 of the pumping element 1 1 in the assembled state of the assembly 10 and further at least two mutually symmetrically with respect to the central passage opening retaining tabs 37 for fastening means on the housing 22. The pumping element 1 1 points a spring 34 which engages on the one hand at a lower portion of the pumping element 1 1 formed shoulder 35 and on the other hand is provided for Abstützung on a stop within the opening of the housing 22. The pumping element 1 1 is accommodated and anchored either in an opening of the housing 22 by means of a planar and thus rigid or by means of a curved and thus elastically formed profile of the fastening flange 12.

Claims

claims

1 . Assembly comprising a pumping element and a mounting flange for installation in a housing, characterized in that the pumping element (1 1) and the mounting flange (12) of the assembly (10) are designed separately.

2. An assembly according to claim 1, characterized in that the mounting flange (12) has a central passage opening, which in the assembled state of the assembly (10) encloses a head portion (21) of the pumping element (1 1).

3. An assembly according to claim 2, characterized in that the central passage opening is circular, while the head portion (21) of the pumping element (1 1) is substantially cylindrical.

4. Assembly according to one of claims 1 to 3, characterized in that the fastening flange (12) has at least two mutually symmetrically with respect to the central passage opening opposite retaining tabs (37) for fastening means (25) on the housing (22).

5. Assembly according to one of claims 2 to 4, characterized in that on the outer body of the pumping element (1 1) is formed on the outer circumference circumferential shoulder (30) which is larger in diameter than the head portion (21) and the head portion (21 ) axially limited downwards.

6. An assembly according to claim 5, characterized in that the shoulder (30) of the pumping element (1 1) as diameter broadening (33) when installed in a housing (22) with a shoulder (38) of the housing (22) cooperates.

7. Assembly according to one of claims 1 to 6, characterized in that the pumping element (1 1) has a spring (34), on the one hand at a in the lower region of the Pump element (1 1) engages formed shoulder (35) and on the other hand is provided for support on a stop within the opening of the housing (22).

8. Assembly according to one of claims 1 to 7, characterized in that the mounting flange (12) rests flat on the shoulder (30).

9. Assembly according to one of claims 1 to 7, characterized in that the fastening flange (12) of the shoulder (30) is arched away.

10. An assembly according to claim 9, characterized in that the curvature between the central axis (24) of the pumping element (1 1) and the location of attachment of the mounting flange (12) on the housing (22) is formed.

1 1. An assembly according to claim 10, characterized in that by adjusting the retaining tabs (37) penetrating fastening means (25) bending of the curvature with a corresponding Verengen dependent on the bending axial distance between retaining tabs (37) and housing (22) at the mounting location such is feasible that the mounting flange (12) exerts an adjustable biasing force on the pumping element (1 1).

12. An assembly according to any one of claims 8 to 1 1, characterized in that the mounting flange (12) is formed of strip material, wherein from the strip material lamellar shaped individual elements are stacked.

13. An assembly according to any one of claims 4 to 12, characterized in that each retaining tab (37) has at least one through hole (23) for receiving a respective associated fastening means (25).

14. An assembly according to claim 13, characterized in that the fastening means (25) are designed as screws and in corresponding bores (26) in an outer side of the housing (22) are anchored.

15. Assembly according to one of claims 7 to 14, characterized in that the shoulder (30) and the shoulder (35) each carry a radially circumferential sealing ring (31, 32).