WO2022199919A1

WO2022199919A1 - Intake system

Info

Publication number: WO2022199919A1
Application number: PCT/EP2022/052739
Authority: WO
Inventors: Bjoern Nordmann
Original assignee: Psa Automobiles Sa
Priority date: 2021-03-25
Filing date: 2022-02-04
Publication date: 2022-09-29
Also published as: EP4314539A1; CN117083453A; DE102021202929A1

Abstract

An intake system (1) having an intake pipe (2), a throttle-valve unit (6) and a clean-air pipe (8), wherein the throttle-valve unit has a first end side (28), which adjoins an inlet (4) of the intake pipe, and wherein the intake-pipe inlet (4) and the first end side (28) have interacting first contours, which clearly define an attachment position of the throttle-valve unit (6) to the intake pipe (2), characterized in that the first contours enclose at least one positioning pin (18) of the intake pipe (2), the positioning pin extending, in a first bore (12) of the throttle-valve unit (6), through a plane which is parallel to the first end side (28) and contains the centre of gravity of the throttle-valve unit.

Description

INTAKE SYSTEM

Description The present invention relates to an intake system with an intake manifold and a throttle valve unit, as known from DE 102011 081 780 A1, and a method for assembling an intake system.

In this known intake system, the intake manifold and the throttle valve unit have complementary flanges which are screwed together when the intake system is assembled. An end of the throttle valve unit facing away from the intake manifold is not shown; DE 102011 081 780 A1 does not reveal how a clean air pipe is to be attached to this end, if necessary. Successively screwing the throttle valve unit to the intake manifold and then the clean air pipe to the throttle valve unit is time-consuming.

If the throttle valve unit is short enough, the assembly of the intake system can be simplified and accelerated by first pushing the throttle valve unit onto the intake manifold, then pushing the clean air pipe onto the throttle valve unit and finally screwing the clean air pipe through the throttle valve unit to the intake manifold. In the time between attaching the throttle valve unit to the intake manifold and screwing it on, there is a possibility that the throttle valve unit will fall and become damaged. Especially when the throttle body is short in length, the throttle body may protrude from the throttle body and be damaged by the fall. The throttle body must then be discarded and another fitted in its place. There is therefore a high demand for manufacturing and assembly technology that can be used to achieve both high productivity and the risk of damage to components during installation can be minimized.

To meet this need, according to one aspect of the present invention, an intake system as described below is proposed. The intake system has an intake manifold, a throttle valve unit and a clean air pipe, the throttle valve unit having a first end face adjoining an intake manifold inlet of the intake manifold and a second end face adjoining an outlet of the clean air pipe, and the intake manifold inlet and the first end face interacting, a mounting position of the Throttle valve unit on the intake manifold clearly defined first contours, wherein the first contours include at least one positioning pin of the intake manifold, which extends in a first bore of the throttle valve unit through a plane parallel to the first end face that contains the center of gravity of the throttle valve unit. This positioning pin provides the throttle valve unit with a secure hold in the period between being pushed onto the intake manifold and screwing it on, even if the direction in which the throttle valve unit is pushed onto the intake manifold is horizontal or even slightly rising when the intake system is installed in a vehicle.

According to one embodiment, the intake manifold inlet is surrounded by a flange of the intake manifold and the positioning pin is anchored to the flange. The flange is preferably part of said first contours.

In order to further improve safety against falling, the positioning pin can be dimensioned long enough to extend over to, or even over, a second face of the throttle body which, when the intake system is fully assembled, connects to an outlet of the clean air pipe protrude the second front side. For example, the positioning pin also offers protection against falling if the throttle valve unit is not in direct contact with the intake manifold inlet, e.g. because the direction of attachment is horizontal and the throttle valve unit is therefore not pressed against the intake manifold inlet by its own weight, or because a sealing ring is still undeformed when mounted between the intake manifold inlet and the throttle valve unit keeps both at a distance. According to one embodiment, a bore can be provided on the clean air pipe, in which the end of the positioning pin extending beyond the second end face engages. The bore and the positioning pin can thus form part of the second contours.

According to one embodiment, the cross section of the positioning pin is not greater than the cross section of the first bore over its entire length. In this way, the throttle valve unit can be attached without force having to be applied to deform the positioning pin or the throttle valve unit.

According to one embodiment, the cross-section of the positioning pin is sized to frictionally engage an inner surface of the first bore of the throttle body. The friction contributes to holding the throttle valve unit securely on the intake manifold in the period of time between the throttle valve unit being pushed onto the intake manifold and the screwing of the throttle valve unit and the clean-air manifold.

According to one embodiment, the number of positioning pins and first bores is at least two each. Two locating pins and bores accommodating them are sufficient to clearly specify a position in which the throttle valve unit can be placed on the intake manifold. This ensures that as soon as the intake manifold is placed, the throttle body is also in the correct position and both can be attached to the intake manifold without further position correction.

According to one embodiment, an outlet of the clean air tube is surrounded by a flange of the clean air tube, and the positioning pin extends through the flange to a side of the flange remote from the throttle body. In particular, the above-mentioned bore of the clean air pipe can be formed in this flange.

According to one embodiment, second contours of the throttle valve unit and the outlet of the clean air pipe clearly specify a mounting position of the clean air pipe on the throttle valve unit. These second contours can be the tip of the positioning pin mentioned above and the bore of the Include clean air pipe. In a preferred embodiment, they include bores in the throttle valve unit, into which pins of the clean air pipe engage.

According to one embodiment, the first contours comprise at least one section of a second bore of the throttle valve unit on the intake manifold side and a pin of the intake manifold engaging in the section on the intake manifold side, and the second contours comprise a section of the second bore on the clean air manifold side and a pin of the clean air manifold engaging in the section on the clean air manifold side.

In other words, the throttle valve unit comprises a second borehole in which a pin of the intake manifold engages on the intake manifold side and a pin of the clean air manifold engages on the intake manifold facing away. Thus, both the throttle valve unit to the intake manifold and the clean air pipe to the throttle valve unit can be positioned by means of a bore in the throttle valve unit

According to one embodiment, the number of the second bores, the pins of the suction pipe engaging in them and the pins of the clean-air pipe engaging in them is at least two each. These are sufficient to clearly determine the installation position of the clean air pipe on the throttle valve unit.

A further aspect of the invention relates to a method for assembling an intake system, as described above and below, having the steps:

placing a first face of the throttle assembly on an intake manifold inlet of the intake manifold in a mounting position in which a locating pin of the intake manifold extends in a first bore of the throttle assembly through a plane parallel to the first face and containing the center of gravity of the throttle assembly;

placing an outlet of the clean air duct at the second face; Clamping of the throttle body between the intake manifold and the clean air manifold.

In particular, screws can be used for clamping, which extend through aligned bores of the intake manifold and the clean air pipe and preferably also the throttle valve unit. One of the bores in the suction pipe and the clean-air pipe can each have an internal thread in order to provide the screw with a hold.

Further features and advantages of the invention result from the following description of exemplary embodiments with reference to the attached figures. Show it:

1 parts of an intake system according to the invention,

2 shows the intake system according to the invention when assembled

condition, and

3 shows a throttle valve unit which is placed on an intake manifold.

1 shows a perspective exploded view of the intake system 1. The intake system 1 has an intake pipe 2, a throttle valve unit 6 and a clean air pipe 8. The intake manifold 2 has an intake manifold inlet 4 . The intake manifold inlet 4 is surrounded by a flange 32 . A sealing surface of the flange 32 facing the throttle valve unit 6 is flat with a surface normal (not shown) which is oriented essentially horizontally in the installation position of the intake manifold 4 in a motor vehicle. Positioning pins 18 and two pins 16, which are shorter than the positioning pins 18, protrude from the flange 32 in the direction of the surface normal.

As shown in FIG. 1, the throttle assembly 6 includes a housing having a central passageway in which a throttle valve is pivotally mounted. The housing has a first end face 28 which faces the flange 32 of the suction pipe 2 and a second end face 30 which faces the clean air pipe 8 . A plane 0 running parallel to both faces 28, 30 contains the center of gravity of the throttle valve assembly 6. The distance between the faces 28, 30 is less than the diameter of the central passage extending from one face 28 to the other 30, so that the throttle valve can protrude beyond the end faces 28, 30 in an open position. In the housing of the throttle valve unit 6 are a first bore 12, a second bore 10 and possibly a through hole 22 distributed around the central passage and extend in the direction of the surface normal.

The clean air pipe 8 has an outlet 36 surrounded by a flange 38 at one end facing the throttle valve unit 6 . Two pins 14 are anchored to the flange 38 . The pins 14 are the pins 16 opposite mirror images.

When assembling the intake system, the throttle valve unit 6 is first placed on the intake manifold inlet 4 of the intake manifold 2 . As shown in FIG. 2, two first bores 12 in the throttle valve unit 6 accommodate the positioning pins 18 of the intake manifold 2 . The positioning pins 18 extend from the flange 32 over the entire length of the bores 12 and thereby cross the plane 0. The cross section of the positioning pins 18 is dimensioned such that they bear against the inner sides of the bores 12 with a friction fit. In order to ensure a secure frictional connection on the one hand, but on the other hand to prevent excessive friction from making it unnecessarily difficult to attach the throttle valve unit 6, the positioning pins have a non-circular cross-section that only touches the insides of the bores 12 at several points on their circumference, e.g. in the form of a polygon , cross or star. The locating pins 18 may also be molded from a different, more malleable material than the flange 32 and the body of the throttle body 6, such as plastic. The positioning pins 18 can thus prevent the throttle valve unit 6 from falling off the intake manifold 2 when the throttle valve unit 6 is not yet screwed to the intake manifold 2, even if the surface normal along which the throttle valve unit 6 is pushed onto the positioning pins is in the direction runs slightly uphill towards the flange 32 . In practice, the inclination of the surface normal to the horizontal can be up to 10°.

Two pins 16 of the intake manifold 2 are each accommodated in a section of the second bores 10 on the intake manifold side. The pins 16 are too short to reach the end face 30 or just level 0, and a section of the second bores 10 on the clean air pipe side is empty. The engagement of the pins 18, 16 of the flange 32 in the bores 12, 10 of the throttle valve unit 6 define their position on the intake manifold 2 clearly; In this position, the bores 20 of the flange 32 are aligned with the through bores 22 of the throttle valve unit 6. A position in which the clean air pipe 8 can be plugged onto the second end face 30 of the throttle valve unit 6 is clearly defined by the requirement that the pins 14 of the clean air pipe 8 must engage in the sections of the second bores 10 on the clean air pipe side. In this position, through holes 24 in the flange 36 of the clean air pipe 8 are aligned with the through holes 22 of the throttle valve unit 6. In order to attach the clean air pipe 8 to the intake manifold and to clamp the throttle valve unit 6 between the intake pipe 2 and the clean air pipe 8, it is sufficient to screw 26 into the through holes 24, 22 to introduce and with the internal thread of

Holes 20 (or if the holes 20 are unthreaded, with a nut placed behind the holes 20) to engage.

3 shows the intake system 1 in an assembled state. Here are the clean air pipe 8 and the throttle unit 6 on the intake manifold 2 by means of

Screws 26 attached. As can be seen in the final assembled position of the intake system 1 , the positioning pin 18 protrudes from the first end face 28 of the throttle valve unit 6 , in particular from the first bore 12 .

Reference sign

1 intake system 2 intake manifold

4 intake manifold

6 throttle body

8 clean air duct assembly

10 second hole 12 first hole

14 pin

16 pin

18 positioning pin

20 hole 22 through hole

24 through hole

26 screw

28 first face

30 second face 32 flange

34 hole

36 outlet

38 flange

Claims

Expectations

1. Intake system (1) having an intake manifold (2), a throttle valve unit (6) and a clean air pipe (8), wherein the throttle valve unit has a first end face (28) adjoining an intake manifold inlet (4) of the intake manifold, and the intake manifold inlet ( 4) and the first end face (28) have interacting first contours that clearly define a mounting position of the throttle valve unit (6) on the intake manifold (2), the first contours comprising at least one positioning pin (18) of the intake manifold (2), which is located in a first bore (12) of the throttle body

(6) extends through a plane parallel to the first face (28) containing the center of gravity of the throttle valve assembly.

2. Intake system according to claim 1, wherein the intake manifold inlet (3) is surrounded by a flange (32) of the intake manifold (2) and the positioning pin (18) is anchored to the flange (32).

3. Intake system according to Claim 1 or 2, in which the throttle valve unit (8) has a second end face (30) adjoining an outlet of the clean air pipe (8) and the positioning pin (18) of the intake pipe (2) extends at least up to the second end face (30) or extends beyond the second end face (30).

4. Intake system according to claim 3, wherein the positioning pin (18) extends into a bore (34) of the clean air pipe (8).

5. Induction system according to one of the preceding claims, in which the cross-section of the positioning pin (18) is not greater than the cross-section of the first bore (12) over its entire length.

6. An intake system according to any one of the preceding claims, wherein the cross-section of the locating pin (18) is sized to frictionally engage an inner surface of the first bore (12) of the throttle body (6).

7. Induction system according to one of the preceding claims, in which the number of positioning pins (18) and first bores (12) is at least two each.

8. intake system according to any one of the preceding claims, wherein a

Outlet (36) of the clean air pipe (8) is surrounded by a flange (38) of the clean air pipe (8) and the positioning pin (18) extends through the flange (38) to a side of the same that faces away from the throttle valve unit (6).

9. Intake system according to claim 8, wherein the second contours of the throttle unit (6) and the outlet (36) of the clean air pipe (8) clearly specify a mounting position of the clean air pipe (8) on the throttle unit (6).

10. Intake system according to Claim 9, in which the first contours comprise at least one section of a second bore (10) of the throttle valve unit (6) on the intake manifold side and a pin (16) of the intake manifold (2) engaging in the section on the intake manifold side, and the second contours comprise a section of the second bore (10) on the clean air pipe side and a pin (14) of the clean air pipe (8) engaging in the section on the clean air pipe side.

11. Intake system according to claim 10, in which the number of the second bores (10), the pins (16) of the intake manifold (2) engaging in them and the pin (14) of the clean air tube (8) engaging in them is at least two each.

12. Method for assembling an intake system from an intake pipe (2), a throttle valve unit (6) and a clean air pipe (8) with the steps

Placing a first end face (28) of the throttle valve unit (6) on an intake manifold inlet (4) of the intake manifold (2) in a mounting position in which a positioning pin (18) of the intake manifold (2) is located in a first bore (12) of the throttle valve unit ( 6) extends parallel to a plane to the first end face (28) which is the focus of the

Throttle body (6) includes; placing an outlet of the clean air duct (8) at the second end;

Clamp the throttle valve unit (6) between the intake manifold (2) and the clean air manifold (8).