Pump unit for reducing agents in an exhaust gas purification system

Abstract

A pump for reducing agents of an exhaust gas purification system for an internal combustion engine of a motor vehicle includes: a diaphragm carrier; a diaphragm arranged on the diaphragm carrier, the diaphragm having a radially outer collar; and a pump housing configured to secure the radially outer collar of the diaphragm. The radially outer collar of the diaphragm has a reinforcing ring.

Claims

1. A pump for reducing agents of an exhaust gas purification system for an internal combustion engine of a motor vehicle, the pump comprising: a diaphragm carrier; a diaphragm arranged on the diaphragm carrier, the diaphragm having a radially outer collar; and a pump housing configured to secure the radially outer collar of the diaphragm, wherein the radially outer collar of the diaphragm has a reinforcing ring entirely arranged on a radially outermost portion of the radially outer collar.

2. The pump as claimed in claim 1, further comprising a holding groove defined by housing parts of the pump housing, wherein the radially outer collar of the diaphragm completely fills the holding groove.

3. The pump as claimed in claim 1, wherein the reinforcing ring is clamped between two housing parts of the pump housing.

4. A pump for reducing agents of an exhaust gas purification system for an internal combustion engine of a motor vehicle, the pump comprising: a diaphragm carrier; a diaphragm arranged on the diaphragm carrier, the diaphragm having a radially outer collar; and a pump housing configured to secure the radially outer collar of the diaphragm, wherein the radially outer collar of the diaphragm has a reinforcing ring, and wherein the reinforcing ring comprises metal.

5. The pump as claimed in claim 1, wherein the reinforcing ring is connected in an integrally joined manner to elastomeric material of the diaphragm.

6. The pump as claimed in claim 1, wherein the reinforcing ring is pressed on the pump housing.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention permits numerous embodiments. For further clarification of its fundamental principle, two of the embodiments are shown in the drawings and will be described in the following text. In the drawings:

(2) FIG. 1 shows a sectional illustration through a pump stage; and

(3) FIG. 2 shows a further embodiment of the pump stage.

DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENTS

(4) FIG. 1 shows a sectional illustration through a pump stage 1, configured as an orbital pump, for reducing agent of an exhaust gas purification system (not shown) for an internal combustion engine of a motor vehicle. An exhaust gas purification system of this type is known, for example, from DE 44 10 022 A1.

(5) The pump stage 1 has a pump housing 2 that includes a plurality of housing parts 3, 4 and 5. The pump housing 2 has a connector 6 for delivering the reducing agent. Within the pump housing 2, a drive shaft 7 is mounted rotatably and is mounted via an anti-friction bearing 8 on a diaphragm carrier 9. The diaphragm carrier 9 is connected to the radially inner region of a diaphragm 10. The diaphragm 10 has two radially outer collars 11, 12 which are clamped in, in each, case between two housing parts 3 and 5. The housing parts 3 and 5 have circumferential holding grooves 13, 14 for the collars 11, 12. It can be seen clearly that the collars 11, 12 of the diaphragm 10 completely fill the holding grooves 13, 14. As a result of their shape, the collars 11, 12 in each case form a reinforcing ring 15, 16 of the diaphragm 10. Furthermore, FIG. 1 shows a separating chamber pin 17 of the pump stage 1.

(6) FIG. 2 shows a part region of a further embodiment of a pump stage 18 having a pump housing 19 before being mounted on a diaphragm 20. The pump housing 19 has three housing parts 21, 22 and 23. On its radially outer region, the diaphragm 20 has two circumferential collars 24, 25 which completely fill a holding groove 26, 27 which is formed by the housing parts. In addition, the collars 24, 25 in each case have a reinforcing ring 28, 29 made from metal. In the assembled state of the pump stage 18, the reinforcing rings 28, 29 are pressed onto the housing parts 21 and 23. The diaphragm 20 is fastened on a diaphragm carrier 30.

(7) Thus, while there have been shown and described and pointed out fundamental novel features of the invention as applied to a preferred embodiment thereof, it will be understood that various omissions and substitutions and changes in the form and details of the devices illustrated, and in their operation, may be made by those skilled in the art without departing from the spirit of the invention. For example, it is expressly intended that all combinations of those elements and/or method steps which perform substantially the same function in substantially the same way to achieve the same results are within the scope of the invention. Moreover, it should be recognized that structures and/or elements and/or method steps shown and/or described in connection with any disclosed form or embodiment of the invention may be incorporated in any other disclosed or described or suggested form or embodiment as a general matter of design choice. It is the intention; therefore, to be limited only as indicated by the scope of the claims appended hereto.