Throttle Valve Device

Abstract

A butterfly valve device (1), particularly an electrically actuated butterfly valve device (1) e.g. for use in an intake manifold of an internal combustion engine is designed in such a way that the effort required for assembling the intake manifold can be reduced while the requirements regarding dimensional tolerances and tightness can be met and the number of parts is minimized. This aim is achieved by the fact that at least one housing part (3) of the butterfly valve device (1) is embodied monolithically along with an intake pipe (15) that is disposed upstream or downstream of the butterfly valve device (1).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be explained in greater detail using examples and with reference to the accompanying drawings in which:

FIG. 1: shows a perspective view of throttle valve device according to the invention;

FIG. 2: shows a further view of a throttle valve device according to the invention from a different perspective from FIG. 1 so as to make the interior of the intake pipe section visible; and

FIG. 3: shows a side elevation of the throttle valve device according to the invention as shown in FIGS. 1 and 2.

DETAILED DESCRIPTION

An inventive throttle valve device 1 (FIGS. 1 to 3) has a throttle valve housing 2 and a throttle valve housing cover 3.

The throttle valve housing 2 has throttle pipe section 4 and a drive casing section 5. The throttle valve housing cover 3 has a drive casing cover section 6 which is connected to a pipe flange 7.

The drive casing section 5 and the drive casing cover section 6 form a parting line 8 which divides approximately symmetrically the drive casing comprising the drive casing section 5 and the drive casing cover section 6.

The throttle pipe section 4 of the throttle valve housing 2 and the pipe flange 7 of the throttle valve housing cover 3 form a second parting line 9. The second parting line 9 is disposed at an angle to the first parting line 8 so that the sealing surfaces forming the parting lines 8, 9 of the throttle valve housing 2 and of the throttle valve housing cover 3 meet in the region between the drive casing 5, 6 and a throttle pipe 10 consisting of the throttle pipe section 4 and the pipe flange 7, forming a kink.

At the transition from the drive casing 5, 6 to the throttle pipe 10, the position of the parting line is selected such that a throttle valve shaft 11 of a throttle valve 12 is pivotally mounted via a bearing recess in the throttle valve housing cover 3 and in the throttle valve housing 2. At an opposite end of the throttle valve shaft 11 the latter is mounted only in a suitable recess inside the throttle pipe section 4 in such a way that the pipe flange 7 is not involved in supporting the throttle valve shaft 11 there. This means that it is possible to preassemble the entire drive (not shown) and the throttle valve 12 together with the throttle valve shaft 11 only in the throttle valve housing 2, so that by placing on and fixing the throttle valve housing cover 3 by means of fixing elements such as mounting clips, mounting surfaces 13 and/or bolts (not shown), fixing can be performed on the throttle valve housing 2 and therefore the drive casing is sealed and the throttle valve 11 is pivotally mounted in the throttle pipe 10.

It is particularly advantageous here that all the relevant dimensional tolerances for installing the drive and in particular for installing the throttle valve 12 or more precisely for supporting the throttle valve, and the surfaces of the throttle pipe section 4 cooperating with throttle valve edges, are all provided in a single housing part, i.e. specifically in the throttle valve housing 2. The throttle valve cover 3 thus only has a covering function and need not therefore meet such stringent requirements in terms of dimensional accuracy, dimensional tolerances and dimensional stability, particularly due to moisture ingress, as the throttle valve housing 2.

For the throttle valve housing 2 in which the throttle gaps between the throttle valve 12 and the throttle pipe section 4 exist, this is of great importance, as even small variations in gap dimensions or more precisely the creation of gaps of smaller cross section can have a significant effect on the supply or more precisely the mixture formation for an internal combustion engine.

Therefore the throttle valve housing 2 is preferably made of metal or a thermosetting plastic, as these materials are capable of maintaining the required tolerances even over lengthy periods of time, particularly when subjected to moisture or strongly fluctuating temperature effects. According to the invention it was now recognized that it is possible, by reducing the function of the throttle valve housing cover 3 to merely a covering function, to make it from a less expensive material, particularly from a plastic which can be processed in an injection molding process.

For this purpose thermoplastic materials in particular, such as PA 6, PA 6.6, PA 4.6 or thermoplastic mixed plastics, have proved suitable according to the invention. As due to material selection the throttle valve housing cover 3 can be manufactured using conventional injection molding methods, there is disposed in the region of the pipe flange 7 at least one sub-region of an intake pipe, i.e. at least one intake pipe section 15 which is disposed in a flow direction 16 e.g. upstream of the throttle pipe section 4 is of a piece with the throttle valve housing cover 3. Preferably the intake pipe usually disposed between the throttle valve device 1 and the engine or rather its intake manifold is connected as a whole, as a single piece, to the throttle valve housing cover 3.

This measure means that there is one less joining plane between an intake pipe and the throttle valve device 1. If an intake valve section 15 is formed on the throttle valve housing cover 3, this allows a freer selection of the mounting plane to the component following the intake pipe section 15 depending on the length of the intake pipe section 15 and the shape of the intake port section 15 in respect of its tubular characteristics. The intake pipe section 15 or rather the intake pipe is essentially cylindrically tubular and is characterized in that it has no interaction surfaces with the throttle valve 12 or rather its boundary edges.

In the throttle valve device according to the invention it is particularly advantageous that a target conflict has been resolved such that a cost reduction could be achieved by reducing the number of components while at the same time providing greater constructional design freedom. It is further advantageous that the leak-proneness and therefore the reliability of the entire throttle valve device 1 in interaction with downstream components is considerably improved, because a sealing plane or rather a parting plane with associated fixing devices can be dispensed with.

Claims

1. A throttle valve device comprising at least two housing parts and a throttle valve, one of the housing parts having a throttle pipe section which cooperates with the throttle valve, the other housing part is of a piece with at least one duct section disposed upstream or downstream of the throttle valve device.

2. A throttle valve device according to claim 1, wherein one of the housing parts is a throttle valve housing and the other housing part is a throttle valve housing cover.

3. A throttle valve device according to claim 1, wherein the duct section is an intake pipe section or an intake pipe.

4. A throttle valve device according to claim 1, wherein one of the housing parts is made of metal and/or a thermosetting plastic.

5. A throttle valve device according to claim 1, wherein one of the housing parts is made of a thermoplastic injection moldable plastic.

6. A throttle valve device according to claim 1, wherein one of the housing parts is made of PA 6, PA 6.6, PA 4.6 or a thermoplastic mixed plastic.

7. A throttle valve device according to claim 2, wherein the throttle valve housing incorporates the throttle pipe section and a drive casing section which are interconnected as one piece.

8. A throttle valve device according to claim 2, wherein the throttle valve housing cover has a drive casing cover section and a pipe flange which are interconnected as one piece.

9. A throttle valve device according to claim 2, wherein the throttle valve housing cover and the throttle valve housing can be assembled together with separation planes at an angle to one another.

10. A throttle valve device according to claim 2, wherein the throttle valve is rotatably and/or pivotally mounted via a bearing recess in the throttle valve housing cover and in the throttle valve housing as well as opposite the bearing recess in a recess inside the throttle pipe section.

11. A throttle valve device comprising a throttle valve, a first housing part having a throttle pipe section which cooperates with the throttle valve, and a second housing part comprising a piece with at least one duct section disposed upstream or downstream of the throttle valve device.

12. A throttle valve device according to claim 11, wherein the first housing part is a throttle valve housing and the second housing part is a throttle valve housing cover.

13. A throttle valve device according to claim 11, wherein the duct section is an intake pipe section or an intake pipe.

14. A throttle valve device according to claim 11, wherein the first housing part is made of metal and/or a thermosetting plastic.

15. A throttle valve device according to claim 11, wherein the second housing part is made of a thermoplastic injection moldable plastic.

16. A throttle valve device according to claim 11, wherein the second housing part is made of PA 6, PA 6.6, PA 4.6 or a thermoplastic mixed plastic.

17. A throttle valve device according to claim 12, wherein the throttle valve housing incorporates the throttle pipe section and a drive casing section which are interconnected as one piece.

18. A throttle valve device according to claim 12, wherein the throttle valve housing cover has a drive casing cover section and a pipe flange which are interconnected as one piece.

19. A throttle valve device according to claim 12, wherein the throttle valve housing cover and the throttle valve housing can be assembled together with separation planes at an angle to one another.

20. A throttle valve device according to claim 12, wherein the throttle valve is rotatably and/or pivotally mounted via a bearing recess in the throttle valve housing cover and in the throttle valve housing as well as opposite the bearing recess in a recess inside the throttle pipe section.