Exhaust duct including a means for retaining a screen
The exhaust duct's immobilizing means, through cutouts on the screen edges contacting the crimping area, addresses the issue of relative movement, ensuring aesthetic and acoustic stability during vehicle operation.
Patent Information
- Authority / Receiving Office
- FR · FR
- Patent Type
- Patents
- Current Assignee / Owner
- NEW H POWERTRAIN HLDG
- Filing Date
- 2021-12-15
- Publication Date
- 2026-04-17
AI Technical Summary
Existing motor vehicle exhaust ducts suffer from the issue of the screen and thermal insulation moving relative to the peripheral wall due to vibratory stresses and differential thermal expansions, leading to aesthetic and acoustic disadvantages.
The exhaust duct incorporates an immobilizing means, such as a tab formed by cutouts on the screen edges, which contact the crimping area of the peripheral wall, preventing relative movement of the screen and insulation.
The immobilizing means effectively prevents the screen and insulation from moving, maintaining aesthetic and acoustic integrity during vehicle motion.
Smart Images
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Abstract
Description
Title of the invention: Exhaust duct comprising a means for retaining a screen
[0001] The invention relates to a motor vehicle exhaust duct having a substantially longitudinal direction and comprising a silencer device consisting of a closed volume arranged around the duct, the silencer having a peripheral wall and end walls assembled together by a crimping zone forming a bead on the surface of the peripheral wall, the silencer being further provided with a layer of thermal insulation disposed on the peripheral wall and covered by a peripheral screen.
[0002] As described in Figures 1 and 2, an exhaust duct 10 according to the prior art comprises a silencer 12 formed by a closed volume arranged around the duct 10. The silencer has a peripheral wall 14 and end walls 16 crimped onto the peripheral wall. The edge 18 of each peripheral wall 14 has a double fold into which the end edge 20 of the peripheral wall 14 is crimped. The crimped area 22 thus formed then creates a peripheral ridge on the end edge 20 of the peripheral wall 14.
[0003] The peripheral wall 14 is covered with a layer of thermal insulation 24 itself covered by a peripheral screen 26. However, due to vibratory stresses and differential thermal expansions, the screen and its thermal insulation tend, over time, and / or during severe use, to move relative to the peripheral wall of the silencer which is then no longer protected.
[0004] Although there are no consequences from a safety point of view, the exposure of the peripheral wall may present an aesthetic and acoustic disadvantage.
[0005] In order to overcome these drawbacks, the invention relates to an exhaust duct comprising a silencer equipped with a screen and thermal insulation of simple, robust, efficient and inexpensive design, which does not move when the vehicle is in motion.
[0006] To this end, the invention proposes an exhaust duct of the type mentioned above, characterized in that the screen includes a means of immobilizing the screen in a longitudinal direction.
[0007] According to other features of the invention:
[0008] - The immobilizing means consists of a tab formed on an edge end of the screen and coming into contact with the crimping area of the peripheral wall of the silencer.
[0009] - The tongue is formed by at least one cutout made in the edge end of the screen.
[0010] - The cut is formed by two cutting lines extending perpendicularly from the end edge of the screen, the two cutting lines being connected to each other by a fold line, so that the immobilizing means is formed by folding, towards the peripheral wall, the tab at the level of the fold line.
[0011] - The end edge has several cutouts.
[0012] - At least one immobilization means is provided on each end edge of the screen.
[0013] The invention also relates to a heat shield intended to cover a muffler of an exhaust duct of a motor vehicle, in which at least one of its end edges has a cutout formed by two cut lines extending perpendicularly from the end edge of the shield, the two cut lines being connected to each other by a fold line, so that the immobilization means is formed by a folded tab, on the side of a concave face of the shield, at the level of the fold line.
[0014] At least one of its end edges has a cutout formed by two cut lines extending perpendicularly from the end edge of the screen, the two cut lines being connected to each other by a fold line, so that the immobilizing means is formed by folding, on the side of a concave face of the screen, the cutout at the fold line.
[0015] Other features and advantages of the invention will become apparent from the description of examples of duct embodiments with reference to the accompanying drawings in which:
[0016] [Fig-1] is a perspective view of an exhaust duct according to the prior art.
[0017] [Fig.2] is a longitudinal cross-sectional view of the duct of [Fig.1].
[0018] [Fig.3] is a perspective view of an exhaust duct according to the invention.
[0019] [Fig.4] is a longitudinal cross-sectional view of the duct of the [Fig.3], at the level of a means of immobilization.
[0020] In the following description, we will take, without limitation, a longitudinal, vertical and transverse orientation indicated by the trihedron L,V,T of figures 1 to 4.
[0021] Identical or analogous elements are designated by the same reference numerals.
[0022] With the exception of the specific elements of the driver's seat, the vehicle has a general symmetry with respect to a median longitudinal plane.
[0023] As described in Figures 3 and 4, an exhaust duct 100 according to the invention extending in a substantially longitudinal direction comprises a silencer 120 formed by a closed volume arranged around the duct 100. The silencer 120 has a peripheral wall 140 and end walls 160 crimped onto the peripheral wall 140. The edge 180 of each end wall 160 has a double fold 162 inside which the end edge 200 of the peripheral wall 140 is crimped. The crimping area 220 thus formed then creates a peripheral ridge on the end edge 200 of the peripheral wall 140.
[0024] The peripheral wall 140 is covered with a layer of thermal insulation 240 which is itself covered by a peripheral screen 260. The peripheral screen 260 has two end edges 280.
[0025] The screen 260 is generally made of a metallic material. The thermal insulation 240, on the other hand, is made of a felt-type material.
[0026] Each end edge 280 of the screen 260 is provided with a means of immobilizing the screen 260 so that the screen 260 and the insulator 240 cannot move in a longitudinal direction relative to the peripheral wall 140 of the silencer.
[0027] The immobilization means 300 consists of a tab 302 formed by a cut in the edge 280 having two straight cut lines 304 extending perpendicularly from the end edge 280 and connected to each other along a fold line 306. The immobilization means 300 is thus formed by folding the tab 302, on the side of the concave face of the screen, therefore in the direction of the peripheral wall 140, along the fold line 306.
[0028] Thus, when the screen 260 is placed on the peripheral wall 140 of the silencer 120, the immobilizing means 300 is in contact with the bead formed by the crimping area 220.
[0029] Each end edge 280 being equipped with a locking means 300, the movement of the screen 260 is then limited both forwards and backwards.
[0030] In an embodiment not shown, each edge includes several immobilization means 300.
Claims
Demands
1. A motor vehicle exhaust duct (100) having a substantially longitudinal direction and comprising a silencer device (120) consisting of a closed volume arranged around the duct (100), the silencer (120) having a peripheral wall (140) and end walls (160) joined together by a crimping zone forming a bead on the surface of the peripheral wall (140), the silencer (120) further being provided with a layer of thermal insulation (240) disposed on the peripheral wall (140) and covered by a peripheral screen (260), the screen (260) comprising a means of immobilizing (300) the screen (260) in a longitudinal direction, characterized in that. the immobilization means (300) consists of a tab (302) formed on an end edge (280) of the screen (260) and bearing against the crimping area (220) of the peripheral wall (140) of the silencer (120).
2. Exhaust duct (100) according to claim 1, characterized in that the tab (302) is formed by at least one cutout made in the end edge (280) of the screen (260).
3. Exhaust duct (100) according to claim 2, characterized in that the cut is formed by two cutting lines (304) extending perpendicularly from the end edge (280) of the screen (260), the two cutting lines (304) being connected to each other by a fold line (306), so that the immobilizing means (300) is formed by the folding, in the direction of the peripheral wall (140), of the tab (302) at the level of the fold line (306).
4. Exhaust duct (100) according to claim 2 or 3, characterized in that the end edge (280) has several tabs (302).
5. Exhaust duct (100) according to claim 1, characterized in that at least one immobilizing means (300) is provided on each end edge (280) of the screen (260).
6. A heat shield (260) for covering a muffler (120) of a motor vehicle exhaust duct (100), characterized in that at least one of its end edges (280) has a cutout formed by two cut lines (304) extending perpendicularly from the end edge (280) of the shield (260), the two cut lines (304) being connected to each other by a fold line (306), so that the immobilization means (300) is formed by a folded tab (302), on the side of a concave face of the screen (260), at the level of the fold line (306).