GB2335173A - Attachment device for an exhaust system of a motor vehicle - Google Patents
Attachment device for an exhaust system of a motor vehicle Download PDFInfo
- Publication number
- GB2335173A GB2335173A GB9905947A GB9905947A GB2335173A GB 2335173 A GB2335173 A GB 2335173A GB 9905947 A GB9905947 A GB 9905947A GB 9905947 A GB9905947 A GB 9905947A GB 2335173 A GB2335173 A GB 2335173A
- Authority
- GB
- United Kingdom
- Prior art keywords
- attachment device
- slot
- elastomer element
- rod
- web
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/18—Construction facilitating manufacture, assembly, or disassembly
- F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
- F01N13/1811—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body with means permitting relative movement, e.g. compensation of thermal expansion or vibration
- F01N13/1822—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body with means permitting relative movement, e.g. compensation of thermal expansion or vibration for fixing exhaust pipes or devices to vehicle body
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K13/00—Arrangement in connection with combustion air intake or gas exhaust of propulsion units
- B60K13/04—Arrangement in connection with combustion air intake or gas exhaust of propulsion units concerning exhaust
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
- F16L3/16—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets with special provision allowing movement of the pipe
- F16L3/18—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets with special provision allowing movement of the pipe allowing movement in axial direction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/033—Noise absorbers
- F16L55/035—Noise absorbers in the form of specially adapted hangers or supports
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Exhaust Silencers (AREA)
- Springs (AREA)
- Exhaust-Gas Circulating Devices (AREA)
- Vibration Prevention Devices (AREA)
Abstract
An attachment device for an exhaust system of a motor vehicle has an elastomer element 9, which has a slot 11 which runs in the direction of travel and in which a rod 12,12a, which is connected to the exhaust system, is accommodated in such a manner that it can move transversely with respect to its longitudinal extent.
Description
1 Attachment device for an exhaust system of a motor vehicle 2335173 The
invention relates to an attachment device for an exhaust system of a motor vehicle.
A known attachment device of this type (DE 44 23 939) has an elastomer element which is fitted into a cylindrical holder and has a through-hole in which the end of a rod which is connected to the exhaust system is displaceably guided. Although this embodiment does allow movement of the exhaust system, which is caused by thermal expansion, and also brings about a certain degree of decoupling of the vibrations transmitted to the exhaust system by the engine from the body or another component, the exhaust system is difficult to fit, owing to the fact that the rod has to be threaded into the through-hole in the elastomer element of the attachment device, which is arranged, for example, on the body. Moreover, the fact that the rod is guided in the elastomer element over the entire length of the latter means that there is a relatively high level of friction. Also, there is no possibility of adapting the damping action of the elastomer element to the differing vibrations which occur in operation at changeable rotational speeds and load states of the engine.
The present invention seeks to provide an attachment device which makes it extremely simple to fit the exhaust system and with which the spring characteristic of the elastomer element can be adjusted, in particular in the vertical direction, so as to meet the prevailing demands.
According to the present invention there is provided an attachment device for an exhaust system of a motor vehicle, having a holder which accommodates an elastomer element, and having a rod adapted to be arranged on the exhaust system and guided displaceably in the elastomer element, wherein the elastomer element has a slot, in which the rod is accommodated so as to be movable transversely with respect to its longitudinal extent.
In the attachment device according to the invention, the rod which is connected to the exhaust system, when being fitted, merely has to be pushed into the slot, in the transverse direction with respect to the open slot. Since the rod is in contact with the wall of the slot only at opposite locations, the friction is low compared to the 2 known design, in which the rod has to bear against the entire wall of the through-hole in order to prevent the exhaust system from rattling. The contact area between the rod and the wall of the slot can be reduced still further by making this wall of convex design. Since the rod moves farther or less far into the slot depending on the expansion of the exhaust system, and thus bears against different areas of the slot wall, it is possible to design the elastomer element with a different spring characteristic in the vertical direction over the displacement path of the rod and, in this way, to achieve damping or decoupling of the vibrations transmitted to the exhaust system as a function of the expansion of the exhaust system and thus as'a function of the operating state of the vehicle engine.
Adaptation of this nature is made particularly simple if the elastomer element has an outer part, which is accommodated in the holder, and an inner part, which contains the slot, which parts are connected to one another by a web. To achieve the desired locally different elasticity of the elastomer element, the web may be provided with lateral ribs, which extend between the outer and inner parts, or with cutouts which, if appropriate, may also have side walls so as to form closed chambers and may be filled with a liquid, e.g. oil, or a gas, in order to achieve the effect of a hydraulic bearing. It is also possible to design the wall thickness of the inner part so that it tapers from the start of the slot to its end, so that a different level of rigidity of the elastomer element can also be achieved along the displacement path of the rod.
If necessary, the elasticity of the elastomer element in the vertical direction can be increased by providing the web with a trapezoidal cross section or by the web, in the transverse direction with respect to the longitudinal extent of the slot, extending in an inclined manner from the inner part to the outer part of the elastomer element. In this way, especially in the area of small vibration movements, the web is subjected only to flexural loads and is comparatively soft. A similar effect is achieved if the web is designed in the manner of a disc spring, i. e. has two discs which are hingedly connected to one another. The inner and outer parts of the elastomer element form a solid block only when the vibration movements become significantly greater, after the web has been completely compressed. In this particular design, the lowamplitude vibrations generated by the engine can be decoupled with great success, significantly improving the ride comfort, while at the same time the movements of the 3 exhaust system are limited by the vibrations caused by the roadway.
As an alternative, the elastomer element may be made from a very soft elastomer mixture, making it possible to dispense with the elastically deformable web. A sheet-metal part which surrounds the slot may be inserted in the elastomer element, which part ensures that the load on the elastomer element is uniform over its entire length when the rod moves upwards or downwards. At thesame time, it is ensured that the elastomer is subjected to tensile load on one side of the slot and to compressive load on the other side.
In the area lying in the slot, the rod may be oval in cross section or may be arranged in a sleeve which is oval in cross section. This makes it possible to separate the sliding movements of the rod and the rotary movements about its centre axis from one another.
Preferred embodiments of the invention are described below with reference to the drawing, in which:
Fig. 1 shows a side view of an attachment device for an exhaust system in the at-rest state, Fig. 2 shows the attachment device of Fig. 1 in partial-load operation of the vehicle engine, Fig. 3 shows the attachment device of Fig. 1 in full-load operation of the vehicle engine, Fig. 4 shows a section on line IV-IV in Fig. 2, with the exhaust system attached on one side, Fig. 5 shows a similar section to Fig. 4, with the exhaust system attached on both sides, Fig. 6 shows a side view of the elastomer element in modified form, Figs. 7 to 18 show various embodiments of the elastomer element and of the rod.
Reference is initially made to Figs. 1 and 4, in which 1 denotes a pipe of an exhaust system of a motor vehicle, which pipe is attached to a body part 2 or to the engine-transmission assembly by means of an attachment device 3.
The attachment device 3 has a U-shaped holder 4, which is screwed on by means of a screw 5 with a nut 6 attached to the body and is secured against rotation by a lug 7 which extends through an opening 8 in the body. The holder 4 4 accommodates a U-shaped elastomer element 9 which, by means of a bent-up lug 10 on the lower limb of the holder 4, is secured so that it cannot be pulled out. The slot 11 in the elastomer element 9 runs in the direction of travel and is preferably open towards the front. It accommodates the endsection 12a of a rod 12 which is connected to the exhaust pipe 1. The end section 12a runs transversely with respect to the longitudinal extent of the slot 12. This makes the exhaust system extremely easy to fit, since the wide side of the rod section 12a is pushed into the slot 11 in the elastomer element 9 of the fitted attachment device 1. Pushing in the rod can be made even easier if the opening of the slot 11 is slightly widened. Integrally formed beads 13 prevent the rod section 12a from slipping laterally out of the slot 11. Beads 14 (Fig. 6) at the start of the slot 11 can prevent the rod section from slipping out at the front in Fig. 1.
In order to ensure that the load on the elastomer element 9 is uniform over its entire length when the rod section 12a is moved upwards or downwards, in the embodiment shown in Fig. 8 a sheet-metal part 24, which surrounds the slot 11, is embedded in the elastomer element 9. Moreover, in this case, the sheet-metal part 24 ensures that in each case one side of the elastomer element is subjected to tensile load and the other side is subjected to compressive load.
In operation, the exhaust system expands as a result of the heating caused by the hot exhaust gases, and the rod section 12a moves further or less far into the slot 11 depending on the extent of heating. Fig. 2 shows the position of the rod section 12a in partial-load operation and Fig. 3 shows the position of the rod section 12a in full-load operation. Movement of the rod section 12a inside the slot 11 can be facilitated by the convex form of the slot walls which can be seen in Fig. 7.
Fig. 5 shows how the exhaust pipe 1 can be held on both sides by means of the same attachment device 3.
The elastomer element 9 preferably comprises an outer part 15, which is accommodated in the holder 3, and an inner part 16, which contains the slot 16, which parts are connected to one another by a web 17. The vertical elasticity of the elastomer element 9 is largely determined by the web 17. This web may be rectangular in cross section, as shown in Fig. 4, or may be trapezoidal in cross section, in accordance with Fig. 9.
Since the heating of the exhaust system and therefore the position of the rod section 12a in the slot 11 are dependent on the operating state of the vehicle engine, it is possible to achieve a decoupling or damping of the vibrations which is adapted to the particular operating state by making in particular the vertical elasticity of the elastomer element different over the length of the slot 11. The above-described design of the elastomer element 9 allows this in a simple manner.
In the embodiment in accordance with Fig. 10, the wall thickness of the inner part 16a of the elastomer element 9 tapers from the start of the slot 11 towards its end, so that a greater level of rigidity is set in the front area of the slot 11 than in the rear area. The precise form of the inner part 16a is dependent on the desired attachment properties. It is also conceivable for the wall thickness to be designed so as to taper from the rear towards the front or to configure the wall thickness of the outer part 15 accordingly.
In the embodiment illustrated in Fig. 11, in addition to the web 17, ribs 18 are provided between the outer part 15 and the inner part 16 of the elastomer element 9, by means of which ribs in particular the vertical rigidity or elasticity of the elastomer element 9 can be varied locally. In accordance with Fig. 12, this can also be achieved by providing apertures 19 in the web 17. All or some of these apertures 19 could be closed off by side walls so as to form chambers, which could be filled with oil or another liquid or with a pressurized gas. This would provide a spring and shock absorber system which can be adapted to all requirements.
The number, position and size of the ribs 18 and apertures 19 are dependent on the desired properties of the attachment.
In the variants illustrated in Figs. 13 and 14, the web 17a or 17b is no longer subjected exclusively to tensile or compressive load, but rather, in the area of small vibration movements, only to flexural loads. For this purpose, the web 17b in Fig. 13 is designed in the manner of a disc spring with two discs 20, 21 which are hingedly connected to one another, while in the embodiment shown in Fig. 14 the web 17c, transversely with respect to the longitudinal extent of the slot 11, extends in an inclined manner from the inner part 16 to the outer part 15. Only when the vibration movements become significantly greater are the stops 22, 23 arranged on the inner and outer parts 15 and 16, respectively, compressed to a block, so that a compressive load is again applied to the elastomer element 9.
6 The embodiments of the elastomer element 9 which have been illustrated may, of course, be combined with one another in any desired way if this appears useful.
The elastomer element 30 illustrated in Fig. 15 differs from the elastomer element 9 only in that it does not have inner and outer parts which are connected to one another by a web, but rather is made from a very soft elastomer mixture, so that the desired elasticity in the vertical direction is achieved despite the compact design.
In the variant illustrated in Fig. 16, the rod section 12a is arranged in a sleeve 26 which is oval in cross section. This separates the sliding movements of the rod section and the rotary movements about its centre axis from one another. Moreover, the contact area between the rod section 12a and the wall of the slot 11 is increased, so that the rod section is no longer pressed so strongly into the elastomer element. This effect can also be achieved if the rod section 12a', as shown in Fig. 17, is itself oval in cross section.
7
Claims (18)
1. An attachment device for an exhaust system of a motor vehicle, having a holder which accommodates an elastomer element, and having a rod adapted to be arranged on the exhaust system and guided displaceably in the elastomer element, wherein the elastomer element has a slot, in which the rod is accommodated so as to be movable transversely with respect to its longitudinal extent.
2. An attachment device according to Claim 1, wherein the wall of the slot is convex.
3. An attachment device according to Claim 1 or 2, wherein at least one bead is provided at the start of the slot, which bead prevents the rod from slipping out of the slot.
4. An attachment device according to any one of Claims 1 to 3, wherein the elastomer element has an outer part, which is accommodated in the holder, and an inner part, which contains the slot, and the two parts are connected to one another by a web.
5. An attachment device according to Claim 4, wherein the cross section of the web is trapezoidal and tapers towards the outer or towards the inner part.
6. An attachment device according to Claim 4 or 5, wherein the inner part or the outer part of the elastomer element has a wall thickness which differs over the length of the slot.
7. An attachment device according to any one of Claims 4 to 6, wherein lateral ribs, which extend between the outer and inner parts, are provided on the web.
8. An attachment device according to any one of Claims 4 to 7, wherein the web is provided with apertures.
8
9. An attachment device according to Claim 8, wherein the, or some of the, apertures form chambers which are closed off by side walls and are filled with a liquid or a pressurized gas.
10. An attachment device according to any one of Claims 4 to 8, wherein the web, in the transverse direction with respect to the longitudinal extent of the slot, extends in an inclined manner from the inner part to the outer part of the elastomer element.
11. An attachment device according to any one of Claims 4 to 8, wherein the web comprises a disc spring.
12. An attachment device according to Claim 10 or 11, wherein stops for limiting the spring travel of the web are provided between the outer and inner parts of the elastomer element.
13. An attachment device according to any one of Claims 1 to 11, wherein a sheetmetal part, which surrounds the slot, is embedded in the elastomer element.
14. An attachment device according to any one of the preceding claims, wherein the holder is U-shaped and engages around the elastomer element and, on at least one of its limbs, has a lug which is bent upwards and prevents the elastomer element from slipping out of the holder.
15. An attachment device according to any one of the preceding claims, wherein the rod is provided with beads which prevent the rod from slipping out of the slot in the transverse direction with respect to the longitudinal extent of the latter.
16. An attachment device according to any one of the preceding claims, wherein the rod is oval in cross section in the area which lies in the slot.
17. An attachment device according to any one of Claims 1 to 16, wherein the rod 9 in the area which lies in the slot, is circular in cross section and is arranged in a sleeve which is oval in cross section.
18. An attachment device for an exhaust system of a motor vehicle, substantially as described herein with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1998111188 DE19811188B4 (en) | 1998-03-14 | 1998-03-14 | Suspension device for an exhaust system of a motor vehicle |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9905947D0 GB9905947D0 (en) | 1999-05-05 |
| GB2335173A true GB2335173A (en) | 1999-09-15 |
| GB2335173B GB2335173B (en) | 2000-06-21 |
Family
ID=7860955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9905947A Expired - Fee Related GB2335173B (en) | 1998-03-14 | 1999-03-15 | Attachment device for an exhaust system of a motor vehicle |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE19811188B4 (en) |
| FR (1) | FR2775939A1 (en) |
| GB (1) | GB2335173B (en) |
| IT (1) | IT1311125B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012057549A (en) * | 2010-09-09 | 2012-03-22 | Bridgestone Corp | Exhaust pipe support tool and exhaust pipe support structure |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10026527B4 (en) * | 2000-05-27 | 2008-08-28 | Eras Entwicklung Und Realisation Adaptiver Systeme Gmbh | Use of an elastic bearing for a vibration-insulated mounting of an exhaust system on a vehicle floor |
| DE102005033488B4 (en) * | 2005-07-19 | 2014-06-18 | Wegu Gmbh & Co. Kg | Fixed bearing with pendulum properties |
| FR2933341B1 (en) * | 2008-07-04 | 2011-02-11 | Peugeot Citroen Automobiles Sa | SYSTEM FOR CONNECTING AN EXHAUST COMPONENT OF A MOTOR VEHICLE TO A BODY COMPONENT OF SAID VEHICLE |
| DE102016210339B4 (en) * | 2016-06-10 | 2020-08-13 | Volkswagen Aktiengesellschaft | Fluid pipe for a motor vehicle with fluid pipe holders |
| CN113339123B (en) * | 2021-06-07 | 2022-04-01 | 扬州润盈机械有限公司 | Tail gas filter equipment for internal-combustion engine convenient to clearance and change |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2981351A (en) * | 1959-09-11 | 1961-04-25 | Gen Motors Corp | Exhaust system support |
| US4361304A (en) * | 1980-05-27 | 1982-11-30 | A. Lakin & Sons, Inc. | Exhaust system hanger |
| US5197698A (en) * | 1991-03-25 | 1993-03-30 | Proprietary Technology, Inc. | Method of mounting and isolating automotive exhaust systems |
| FR2674800B1 (en) * | 1991-04-08 | 1993-07-30 | Hutchinson | EXHAUST TUBING SUSPENSION DEVICE FOR VEHICLE. |
| JP3451706B2 (en) * | 1993-07-09 | 2003-09-29 | マツダ株式会社 | Engine exhaust system |
-
1998
- 1998-03-14 DE DE1998111188 patent/DE19811188B4/en not_active Expired - Fee Related
-
1999
- 1999-03-12 FR FR9903072A patent/FR2775939A1/en not_active Withdrawn
- 1999-03-12 IT ITRM990157 patent/IT1311125B1/en active
- 1999-03-15 GB GB9905947A patent/GB2335173B/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012057549A (en) * | 2010-09-09 | 2012-03-22 | Bridgestone Corp | Exhaust pipe support tool and exhaust pipe support structure |
Also Published As
| Publication number | Publication date |
|---|---|
| ITRM990157A1 (en) | 2000-09-12 |
| FR2775939A1 (en) | 1999-09-17 |
| DE19811188A1 (en) | 1999-09-16 |
| GB2335173B (en) | 2000-06-21 |
| DE19811188B4 (en) | 2004-12-30 |
| GB9905947D0 (en) | 1999-05-05 |
| IT1311125B1 (en) | 2002-02-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20030315 |