EP2165104A1

EP2165104A1 - Charge-air hose

Info

Publication number: EP2165104A1
Application number: EP08759779A
Authority: EP
Inventors: Jörg HELLFEIER; Hartmut Brill; Helmut Hoffmann; Peter Reichardt; Dieter Bamberger; Karl-Heinz Siebels
Original assignee: ContiTech MGW GmbH
Current assignee: ContiTech MGW GmbH
Priority date: 2007-07-06
Filing date: 2008-05-20
Publication date: 2010-03-24
Also published as: DE102007031614A1; JP2010532455A; BRPI0813582A2; WO2009007165A1; US8267435B2; US20100140923A1

Abstract

A charge-air hose 2 according to the invention for connecting to a pipe stub 4 is, in the assembled position, pushed into the pipe stub 4 in such a way that excess pressure occurring in the charge-air hose 2 presses the charge-air hose 2 radially outward against the radial inner wall 6 of the pipe stub 4. According to the invention, the charge-air hose 2 is assigned latching means which, during the insertion of the charge-air hose 2 into the pipe stub 4, latch with the pipe stub 4 so as to axially fix the charge-air hose 2 to the pipe stub 4 in a predetermined axial position of the charge-air hose 2 relative to the pipe stub 4.

Description

description

Charge air hose

The invention relates to a charge air hose of the type mentioned in the preamble of claim 1 for connection to a nozzle.

Charge air hoses of this kind are used, for example, in internal combustion engines provided with a turbocharger, the charge air hose leading the charge air compressed by the turbocharger into a charge air cooler and / or leading to the engine inlet.

From DE 10 2005 32 341 B3 a charge air hose of the type in question is known, which is inserted in the mounting position in a socket, such that occurring in the charge air hose overpressure the La- exuftschlauch radially outwardly against the radial inner wall of the nozzle suppressed. The attachment of the known charge air hose to the nozzle via a sleeve formed of elastic material and a cross-sectionally L-shaped retaining sleeve whose axial leg rests against the sleeve and which rests with its radial leg on the hose.

The known charge air hose allows due to its design easy mounting on the nozzle and a relatively secure connection between the hose and the nozzle. The invention has for its object to provide a charge air hose of the type mentioned in the preamble of claim 1, wherein the mounting of the charge air hose is further simplified at the nozzle and in which the connection between the charge air hose and the nozzle in the mounting position of the charge air hose even further improved.

This object is achieved by the teaching defined in claim 1.

The basic idea of the teaching according to the invention consists in the connection of the charge air hose, which is also referred to as hose, to be performed with the nozzle functions, namely a seal of the hose against the neck on the one hand and a secure attachment of the hose to the neck on the other hand, from each other separate. The function of the seal is inventively effected in that the hose is inserted into the mounting post in the socket, so that occurring in the hose overpressure pushes the hose radially outward against the radial inner wall of the nozzle and thereby provides the required seal. The function of the attachment of the hose to the nozzle is inventively effected in that the hose locking means are assigned to the axial fixation of the hose to the nozzle during insertion of the hose into the nozzle in a predetermined axial position of the hose relative to the nozzle with the same lock. Thus, a locking connection between the hose and the nozzle is formed according to the invention, through which the hose is securely held even at axial load on the nozzle. A particular advantage of the hose according to the invention is that it is particularly easy to assemble on the neck and the correct installation is particularly easy to control. For this purpose, the hose is inserted axially into the nozzle and inserted so far into the nozzle until the locking means engage with the nozzle. With appropriate design of the locking means this locking can be clearly audible, so that it is acoustically controllable for a worker that the hose is properly mounted on the neck. Since the hose is always in a predetermined axial position relative to the nozzle in the mounting position due to the locking with the nozzle, in addition, a visual inspection of the correct assembly is possible. Such optical control can be achieved, for example, by measuring the axial distance of the free ends of the spring ring or a mark on the hose to the neck.

Furthermore, there is an advantage of the hose according to the invention is that it can be basically connected to the nozzle without tools and is easy to dismantle in case of repair.

Another advantage of the hose according to the invention is that it offers a particularly good long-term tightness in the mounting position.

Another advantage of the hose according to the invention is that it is relatively easy and inexpensive to produce.

The basic principle of the invention the connection of a hose with a nozzle is also applicable to cooling water hoses. According to the invention, the locking means can be arranged at any suitable point of the charge air hose. In order to further simplify the construction of the charge air hose according to the invention and thus to make it more cost effective, an advantageous further development of the teaching according to the invention provides that the locking means are arranged on the radial outer surface of the charging air hose. In this embodiment, the radial outer surface of the charge air hose locks with the radial inner wall of the nozzle.

Expediently, the latching means have at least one latching projection assigned to the charge air hose, which engages in latching position in a latching recess assigned to the socket. Here are number, configuration and arrangement of the locking projection or locking projections according to the respective requirements within wide limits selectable.

In order to make the latching means particularly simple, another development of the teaching according to the invention provides that the latching projection is spring-loaded in the radial direction outwards and the latching recess is a recess extending in the radial direction.

In the embodiments with the latching recess, this can basically be formed on a separate component fixedly connected to the connection piece. In order to simplify the construction even further and thus make it more cost effective, provides an advantageous development that the locking recess is formed in or on the neck.

In this case, the latching recess advantageously a slot formed in the neck or at the Radial inner wall of the nozzle formed groove, as another development provides. The advantage of a slot is that it can be introduced by means of a suitable tool from the radially outer surface forth in the nozzle, so that a processing of the nozzle on its radial inner wall is not required.

According to the invention, it is basically sufficient if only one latching projection and one associated latching recess are provided in the embodiment with the latching projection and the latching recess. In order to further improve the fixation of the charge air hose to the neck, provides an expedient development of the teaching according to the invention, that at least two mutually spaced in the circumferential direction of the nozzle locking projections and associated latching recesses are provided.

According to the invention, the locking means may be formed in any suitable manner. An extraordinarily advantageous development of the teaching according to the invention provides that the latching means have at least one spring ring which is resilient in the radial direction. In this embodiment, the locking means are particularly simple and therefore designed cost.

An advantageous development of the aforementioned embodiment provides that the spring ring is connected via a substantially dimensionally stable holding part with the charge air hose. In this embodiment, the holding part, for example, and in particular rest against the nozzle and serve to absorb axial forces.

A development of the embodiment with the Holding part provides that the holding part is connected in the axial direction positively with the charge air hose. In this embodiment, an axial displacement of the holding part and thus of the spring ring is avoided relative to the charge air hose, so that the attachment of the charge air hose is further improved at the nozzle.

Another embodiment of the embodiments with the holding part provides that the holding part is received in a circumferential groove formed on the outer surface of the charge air hose. A corresponding circumferential groove can be molded into the outer surface of the charge air hose during the production of the charge air hose.

An extremely advantageous development of the embodiments with the spring ring provides that the spring ring radially inwardly projecting portions, with which it is supported on the charge air hose or the holding part, and at least one radially outwardly projecting portion which forms a locking projection. In this embodiment, the latching projection or the latching projections are formed integrally with the spring ring, so that there is a particularly simple and inexpensive construction.

Another advantageous embodiment of the embodiment with the spring ring provides that the spring ring is designed to be open in the circumferential direction, wherein its free ends are bent or angled substantially extending in the radial direction. In this embodiment, the spring ring can be compressed by compressing its free ends in the radial direction, so that formed on the spring ring detent free spring from the associated recesses, for example, to solve the charge air hose from the nozzle.

In order to further improve the tightness between the nozzle and the charge air hose, provides an advantageous development of the teaching of the invention that the clear inner width of the nozzle in a contact area, in which the insertion end of the tube rests in the mounting position on the radial inner wall of the nozzle, in Insertion direction reduced. In this way, a particularly effective seal is achieved in the investment area.

In the aforementioned embodiment, the radial inner wall of the nozzle in the contact region in cross-section at least partially substantially circular arc or conically shaped, as provided by an advantageous development.

In order to further improve the seal between the charge air hose and the neck, another advantageous development of the teaching according to the invention provides that the insertion end of the charge air hose is designed to be substantially complementary to the contact area in cross section. In this embodiment, the insertion end of the charge air hose sets in mounting position due to its complementary shape even in the pressureless state to the inner wall of the nozzle, so that even in the pressureless state, an effective seal is achieved, which is further improved that in the charge air hose overpressure occurs, which presses the insertion end of the charge air hose against the radial inner wall of the nozzle.

To continue assembling the charge air hose simplifies, provides another advantageous development of the teaching of the invention that the charge air hose is assigned an acting in the insertion axial stop. In this embodiment, the charge air hose passes when inserted into the nozzle to the stop to the system, so that assembly errors are reliably avoided.

A particularly advantageous development of the aforementioned embodiment provides that the stop is arranged in the axial direction of the nozzle in such a way that the latching means engage with the nozzle when the charge air hose is in an axial position determined by the stop relative to the nozzle. In this embodiment, the latching means lock with the nozzle as soon as the charge air hose is in the desired mounting position.

In order to form the stop in a particularly simple and cost-effective manner, an advantageous development of the embodiments with the stop provides that the stop is a shoulder formed on the radial inner wall of the neck.

In order to further simplify the assembly of the charge air hose according to the invention, another advantageous further development provides means for determining the position of the charge air hose in the circumferential direction relative to the nozzle during insertion of the charge air hose into the nozzle. In this way, it is ensured that the charge air hose is oriented in the circumferential direction during insertion into the nozzle so that the latching means can latch with the nozzle, so for example, a locking projection in the circumferential direction opposite to a formed in the socket recess. An advantageous development of the aforementioned embodiment and the embodiment with the spring ring provides that the means for determining the position of the charge air hose in the circumferential direction have a extending from the free end of the nozzle in the axial direction slot in which the free ends of the spring ring during insertion of the Charge air hose are guided in the nozzle. In this embodiment, the assembly of the charge air hose is further simplified by the orientation of the charge air hose is fixed in the circumferential direction relative to the nozzle in that the free ends of the spring ring are inserted into the slot.

Appropriately, the locking means in the mounting position of the charge air hose form a releasable latching connection between the charge air hose and the neck.

To facilitate disassembly of the charge air hose from the neck, provides another advantageous development of the embodiments with the spring ring, that the free ends of the spring ring protrude in the mounting position on the radial outer wall of the nozzle. In this embodiment, over the radial outer wall of the nozzle protruding free ends of the spring ring can be grasped by means of a tool and compressed to the radial compression of the spring ring, so that the latching means detent and the charge air hose can be disassembled from the nozzle.

To further simplify the mounting of the charge air hose to the neck, another embodiment of the teaching of the invention provides that at the mounting of the charge air hose facing free end of the nozzle to form an insertion bevel for the introduction of the charge air hose has a circumferential chamfer. In this embodiment, the insertion of the charge air hose is simplified in the nozzle. In addition, in particular in this embodiment, the assembly of the charge air hose to the nozzle done without tools.

The invention will be explained in more detail with reference to the accompanying drawing, in which an embodiment of a charge air hose according to the invention is shown. All claimed in the claims, described and illustrated in the drawings features taken alone or in any combination with each other the subject of the inventors, regardless of their summary in the claims and their dependency and regardless of their description or representation in the drawing.

It shows:

Fig. 1 shows an axial section through an embodiment of a hose according to the invention in the mounting position and

2 shows a radial section through the hose according to FIG. 1 along a line II-II in FIG. 1, FIG.

Fig. 3 in the same representation as Fig. 1 the

Hose according to FIG. 1 before mounting on the connecting piece,

Fig. 4 in the same representation as Fig. 1 the

Hose according to FIG. 1 during assembly ge during insertion into the nozzle and Fig. 5 is a radial section through the tube of FIG. 4 along a line VV in Fig. 4th

1 shows an exemplary embodiment of a hose 2 according to the invention, which is designed as a bellows-type charge-air hose, of which only one end can be seen in FIG. The hose 2 is provided for connection to a nozzle 4, wherein the hose 2 is inserted in the mounting position shown in Fig. 1 in the nozzle 4, such that occurring in the hose 2 overpressure the hose 2 radially outwardly against the radial inner wall 6 of the neck 4 presses. As can be seen from Fig. 1, the inside diameter of the nozzle 4 is reduced in a contact area 8, in which the insertion end of the tube 2 in mounting position at the radial inner wall 6 of the nozzle 4, in the in Fig. 1 by an arrow 10th symbolized introduction direction. In the illustrated embodiment, the radial inner wall 6 of the nozzle 4 in the abutment portion 8 in sections substantially arcuately shaped, wherein the insertion end of the tube 2 is formed to the abutment portion 8 in cross-section substantially complementary. In this way, results in the mounting position of the hose 2 to the nozzle 4, a particularly good seal between hose 2 and 4.

According to the invention, the hose 2 is associated with locking means, which are used for the axial fixation of the hose 2 to the neck 4 during insertion of the hose 2 in the Stub 4 in a predetermined axial position of the hose 2 relative to the nozzle 4 with the same latch. This latching means, which are explained in more detail below with reference to FIG. 2, are arranged in this embodiment on the radially outer surface 12 of the tube 2.

2 shows a radial section through the hose 2 and the neck 4 according to FIG. 1. In this exemplary embodiment, the locking means have a spring ring 14 which is resilient in the radial direction and has a radially projecting section which forms a latching projection 16 and in the assembly position of FIG Hose 2 engages in a latching recess 18 which is formed in this embodiment by a formed in the outer wall of the nozzle 4, extending in the circumferential direction slot. In the embodiment shown in the drawing, in addition to the locking projection 16 further correspondingly formed latching projections 16 'and 16' 'are provided, which are associated with correspondingly formed Rastausneh- ments 18' and 18 '' in the form of slots. As is apparent from Fig. 2, the locking projections 16, 16 ', 16' 'each offset by 120 ° to each other along the circumference of the tube 2 and the slots 18, 18', 18 '' in the circumferential direction of the nozzle 4 accordingly also each offset 120 ° to each other.

The spring ring 14 is connected in this embodiment via a substantially dimensionally stable holding part in the form of a retaining ring 20 with the hose 2 (see Fig .. 1), wherein the spring ring 14 in this embodiment in a on the outer surface of the Retaining ring 20 formed circumferential groove 22 is received. As can be seen from Fig. 2, the retaining ring 20 in circumferentially spaced, circumferentially extending slots 24, 24 ', 24''and24''', which are arranged in the circumferential direction so that in the mounting position radially to inside projecting portions 26, 26 ', 26''and26''' of the spring ring 14 are opposite, so that the spring ring 14 with the radially inwardly projecting portions 26-26 '''in mounting position on the radially outer surface 12 of the tube. 2 supported.

In this embodiment, the spring ring 14 is formed open in the circumferential direction, with its free ends 28, 30 are bent substantially in the radial direction, as shown in FIG. 2 can be seen. By squeezing the free ends 28, 30 of the spring ring 14 is thus radially compressible against its spring action.

In the embodiment shown in the drawing, the tube 2 is associated with an axial stop acting in the insertion direction 10, which is formed by a shoulder 32 formed on the radial inner wall 6 (cf., Fig. 1) of the neck 4. The shoulder 32 is arranged in the axial direction of the nozzle 4 such that the latching projections 16, 16 'and 16' 'in the associated recesses 18, 18' and 18 '' engage when the hose 2 in a defined by the shoulder 32 axial position relative to the nozzle 4 is located.

Furthermore, in the illustrated embodiment, means for determining the position of the tube 2 in the circumferential direction to the nozzle 4 during insertion of the Hose 2 provided in the neck 4, which in this embodiment have a slot 34 extending in the axial direction from the free end of the nozzle 4 (see Fig. 1), in which the free ends 28, 30 of the spring ring 14 during insertion of the hose 2 are guided in the socket 4.

In order to facilitate the insertion of the tube 2 in the nozzle 4 during assembly, a circumferential chamfer 36 is provided to form a chamfer on the hose 2 facing the free end of the nozzle 4. Due to the centering of the spring ring 14 on the tube 2 via the radially inwardly projecting portions 26-26 '' 'is a minimum chamfer as insertion be enough.

The operation of the hose 2 according to the invention is as follows:

Fig. 3 shows the hose 2 prior to assembly to the nozzle. 4

For mounting the hose 2 to the nozzle 4, the hose 2 is inserted with its insertion end in the insertion direction 10 in the socket 4, wherein the insertion is facilitated by the chamfer 36. When inserting the tube 2 in the socket 4, the locking projections 16, 16 ', 16' 'resiliently engage the radial inner wall 6 of the nozzle 4 to the system, so that the spring ring 14 is radially compressed. Here, the position of the tube 2 in the circumferential direction is determined by the fact that the free ends 28, 30 of the spring ring 14 are guided in the axial slot 34 in the socket 4.

Fig. 4 shows the hose 2 during assembly to the nozzle 4 in an axial position in which the Spring ring 14 runs on the chamfer 36 and begins to be compressed radially.

5 shows a radial section along a line V-V in FIG. 4.

Upon reaching a predetermined axial position of the tube 2 relative to the nozzle 4, which defines the mounting position of the tube 2, the retaining ring 22 axially abuts the shoulder 32 to the plant, at the same time the locking projections 16, 16 ', 16' 'under the spring action engage the spring ring 14 in the associated recesses 18, 18 'and 18' 'and thus lock the hose 2 directly to the nozzle 4. In the mounting position of the hose 2 is thus locked to the nozzle 4 and thus securely attached to the nozzle 4 even with axial loads. As is apparent from Fig. 1, in the mounting position, the insertion end of the tube 2, which is formed to the abutment portion 8 of the nozzle 4 is substantially complementary, close to the radial inner wall 6 of the nozzle 4, so that an effective seal between hose 2 and 4 stub is achieved.

Overpressure that occurs when using the tube 2 in the interior, presses the hose firmly against the radial inner wall 6 of the nozzle 4, so that the seal is further improved.

The radial outer surface 12, which forms the shell of the hose 2, presses the spring ring 14 with an additional force on the radial inner wall 6 of the nozzle 4 concentrically at a pressure occurring in the interior of the hose 2. In this way, the tightness of the spring ring 14 is increased beyond its residual stress, so that the safety of Connection between the hose 2 and the nozzle 4 is substantially improved.

The tube according to the invention thus enables a simple and secure installation of the hose 2 to the nozzle 4, which can basically be done without tools.

In the embodiment shown in the drawing, the locking means form a releasable latching connection between the hose 2 and the nozzle 4. As can be seen from Fig. 1, are in this embodiment, the free ends 28, 30 of the spring ring 14 in the mounting position on the radial outer wall of the Neck 4 forth. To release the locking connection between the hose 2 and the neck 4, the free ends 28, 30 of the spring ring 14 are compressed, so that the spring ring 14 is compressed in the radial direction and the locking projections 16, 16 ', 16' 'in the radial direction to move inward , Here they get out of engagement of the locking recesses 18, 18 'and 18' ', so that the hose 2 is unlocked from the nozzle 4 and can be removed in the axial direction in Fig. 1 to the right. The dismantling of the hose 2 according to the invention of the nozzle 4 is thus also designed very simple.

In order to prevent the spring ring 14 from expanding too far and making the assembly more difficult because the locking projections 16 to 16 "protrude too far in the radial direction, two retaining lugs 38, 38 'are provided (compare FIG. 2 and FIG. 5). The retaining lugs 38, 38 'may in particular be formed integrally with the retaining ring 20, for example, punched out of the retaining ring 20 and in the axial direction or circumferential direction extending be bent out of the retaining ring 20. While such an embodiment due to the integral formation of the retaining lugs 38, 38 'with the retaining ring 20 is particularly simple and therefore inexpensive to produce, the retaining lugs 38, 38' may also be formed by separate, in particular connected to the retaining ring 20 components. Instead of the retaining lugs 38, 38 'according to the invention also other means may be provided which limit the radial expansion of the spring ring 14 to a predetermined extent.

In summary, the hose 2 according to the invention is simple and inexpensive to produce, particularly easy to assemble and disassemble, offering excellent long-term sealing in the mounting position.

Claims

claims

1. charge air hose for connection to a connecting piece, the charge air hose being pushed into the connecting piece in the mounting position such that overpressure occurring in the charge air hose presses the charge air hose radially outwards against the radial inner wall of the connecting piece,

marked by

the charge air hose (2) associated latching means for axially fixing the charge air hose (2) to the nozzle (4) during insertion of the charge air hose (2) in the nozzle (4) in a predetermined axial position of the charge air hose (2) relative to the nozzle (4) lock with the same.

Second charge air hose according to claim 1, characterized in that the latching means on the radial outer surface (12) of the charge air hose (2) are arranged.

3. Charge air hose according to claim 1 or 2, characterized in that the latching means at least one the charge air hose (2) associated latching projection (16) which engages in a detent position in a socket associated with the recess (18).

4. Charge air hose according to claim 3, characterized in that the latching projection (16) is spring-loaded in the radial direction outwards and the latching recess

(18) a radially extending recess. mung i st.

5. Charge air hose according to claim 3 or 4, characterized in that the latching recess (18) is formed in or on the neck (4).

6. Charge air hose according to one of claims 3 to 5, characterized in that the latching recess (18) in the nozzle (4) formed slot or on the radial inner wall (6) of the nozzle (4) formed groove.

7. charge air hose according to one of claims 3 to 6, characterized in that at least two in the circumferential direction of the connecting piece (4) mutually spaced latching projections (16, 16 ', 16' ') and associated latching recesses (18, 18' 18 '') are provided.

8. charge air hose according to one of the preceding claims, characterized in that the latching means at least one resilient spring ring in the radial direction

(14).

9. Charge air hose according to claim 8, characterized in that the spring ring (14) via a substantially dimensionally stable holding part with the charge air hose (2) is connected.

10. Hose according to claim 9, characterized in that the holding part in the axial direction is positively connected to the charge air hose (2).

11. Charge air hose according to claim 9 or 10, characterized in that the holding part is received in a circumferential groove formed on the outer surface of the charge air hose (2).

12. charge air hose according to one of claims 9 to 11, characterized in that the holding part is designed as a retaining ring (20).

13. Charge air hose according to claim 12, characterized in that the spring ring (14) in a on the outer surface of the retaining ring (20) formed circumferential groove (22) is accommodated.

14. Charge air hose according to claim 13, characterized in that the spring ring (14) radially inwardly projecting portions, with which it is supported on the charge air hose (2) or the holding part, and at least one radially outwardly projecting portion having a locking projection (16).

15. Charge air hose according to one of claims 8 to 14, characterized in that the spring ring (14) is designed to be open in the circumferential direction, wherein its free ends (28, 30) are bent or angled extending substantially in the radial direction.

16. Charge air hose according to one of the preceding claims, characterized in that the inside clear width of the nozzle (4) in a contact area (8), in the mounting position, the insertion end of the loading air hose (2) on the radial inner wall (6) of the Stutzens (4) is applied, reduced in the insertion direction.

17. Charge air hose according to claim 16, characterized in that the radial inner wall (6) of the connecting piece (4) in the abutment region (8) in cross-section at least partially arcuately or conically shaped.

18. Charge air hose according to claim 16 or 17, characterized in that the insertion end of the charge air hose (2) to the abutment region (8) is formed in cross-section substantially complementary.

19. Charge air hose according to one of the preceding claims, characterized in that the charge air hose (2) in the insertion direction (10) acting axial stop is associated.

20. Charge air hose according to claim 19, characterized in that the stop in the axial direction of the nozzle (4) is arranged such that the latching means with the nozzle (4) engage when the charge air hose (2) in an axial position determined by the stop located relative to the nozzle (4).

21. Charge air hose according to claim 19 or 20, characterized in that the stop is formed on the radial inner wall (6) of the connecting piece (4) shoulder (32).

22. Charge air hose according to one of the preceding claims, characterized in that means for solid Placement of the position of the charge air hose (2) in the circumferential direction relative to the nozzle (4) during insertion of the hose (2) are provided in the nozzle (4).

23. Charge air hose according to claim 15 and 22, characterized in that the means for determining the position of the charge air hose (2) in the circumferential direction extending from the free end of the connecting piece (4) extending in the axial direction slot (34), in which the free Ends of the spring ring (14) during insertion of the charge air hose (2) in the nozzle (4) are guided.

24. Charge air hose according to one of the preceding claims, characterized in that the latching means in the mounting position of the charge air hose (2) form a releasable latching connection between the charge air hose (2) and the neck (4).

25. Charge air hose according to claim 23 and 24, characterized in that the free ends of the spring ring

(14) in mounting position on the radial outer wall of the nozzle (4) protrude.

26. Charge air hose according to one of the preceding claims, characterized in that during assembly of the charge air hose (2) facing the free end of the nozzle (4) to form an insertion bevel for the introduction of the charge air hose (2) has a circumferential chamfer (36).