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
• • 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
  • F16L27/00—Adjustable joints, Joints allowing movement
  • F16L27/02—Universal joints, i.e. with mechanical connection allowing angular movement or adjustment of the axes of the parts in any direction
  • F16L27/04—Universal joints, i.e. with mechanical connection allowing angular movement or adjustment of the axes of the parts in any direction with partly spherical engaging surfaces
• • 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
  • F01N13/08—Other arrangements or adaptations of exhaust conduits
• • 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
  • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
  • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
  • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
  • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
  • F01N3/28—Construction of catalytic reactors
  • F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration

Definitions

• the present invention relates to a connection between a first pipe piece and a second pipe piece, wherein the cross-section of both pipes is substantially equal and wherein the connection allows at least a mutual angular displacement of the axis of both pipe pieces in a plane extending through both axes.
• a desired degree of flexibility is obtained by arranging a short piece of flexible pipe between the first pipe piece and the second pipe piece.
• US-A-4 188 784 provides such a connection for this purpose wherein the first pipe comprises at least two passages, the second pipe comprises at least two passages, in that in any mutual position of the pipes the separating walls between the passages in the first pipe at least practically make contact with the separating walls between the passages in the second pipe.
• the object of the present invention is to provide such a connection wherein the partitioning between the two passages is maintained up to a position beyond the second pipe piece, this at as many different mutual angular positions of the pipe pieces as possible.
• This objective is achieved in that both pipe pieces have a round cross -section and in that the separating wall between the pipe pieces extends substantially as a sphere with the point of rotation of the pipe pieces as centre.
• the second pipe is provided with a number of passages larger than two .
• both pipes have a round cross -section and the separating wall between the pipes extends substantially as a sphere with the point of rotation of the pipes as centre.
• the present invention has a wide field of application, the advantages of the present invention become particularly apparent in the use as components of the exhaust system of a motor vehicle.
• the exhaust systems are usually constructed such that such mutual movements result in a mutual angular displacement between diverse components of an exhaust system.
• the present invention finds more particular application when the first pipe forms a connection between an engine of a motor vehicle and a catalytic converter, and wherein the second pipe is formed by a converter housing.
• a catalytic converter is in any case already provided with a large number of parallel channels which are particularly attractive to serve as partitioned passages in the present invention.
• a further advantage is manifested in the fact that a catalytic converter is a relatively heavy component of an exhaust system, wherein it is attractive in respect of temperature management to place this component the shortest possible distance from the engine block. So as to subject the catalytic converter as little as possible to the vibrations from the engine block it is particularly attractive to arrange such a connection according to the invention in the exhaust system and, because of the large number of channels in a catalytic converter, this connection can preferably be used in the proximity of the catalytic converter.
• the advantages of the invention are particularly manifest in this embodiment, since it is important that the exhaust gas flows coming from the diverse cylinders remain separated as far as possible so as to prevent mutual influencing of the cylinders.
• figure 1 shows a partly broken away perspective view of a first embodiment of the device according to the present invention
• figure 2 is a schematic perspective view of an engine, wherein a connection according to the present invention is placed between the engine and the catalytic converter
• figure 3 shows a cross-sectional view of a catalytic converter which is provided on both sides with a connection according to the present invention
• figure 4 shows a cross-sectional view of a variant of the embodiment depicted in figure 3
• figure 5 shows a cross-sectional view of another variant of the embodiment depicted in figure 3.
• Figure 1 shows a first pipe 1 formed by two passages 2,3 separated by a separating wall 4.
• the first pipe 1 comprises an outer pipe 5 in which are placed two inner pipes 6 respectively 7 so that separating wall 4 is formed by two inner pipes 6,7.
• This comprises a first passage 9 and a second passage not shown in the drawing. Both passages are separated by a partition wall 10, while the whole assembly of the second pipe is formed by an outer pipe 11 and two inner pipes 12, wherein the second is not shown in the drawing. Both pipe pieces connect to each other.
• the end of outer pipe 5 is thus widened to form a cup 13 and the corresponding end of outer pipe 11 is provided with a collar 14.
• Placed between the end of pipe 11 and collar 14 is an annular junction 15 which on its outside has substantially the shape of a segment of a sphere.
• Both pipe pieces 1,8 are fixed to each other by a coupling not shown in the drawing which allows a rotation movement between both pipe pieces but which holds both pipe pieces in mutual contact .
• separating walls 4 respectively 10 extend to within close proximity of each other.
• one of the two separating walls is herein provided with a concave end wall while the other is provided with a convex end wall.
• Figure 2 shows an application of such an embodiment .
• FIG. 2 shows an engine block 16 provided with an exhaust manifold 17 which runs out into a pipe piece 18.
• a catalytic converter 19 is further shown, wherein converter 19 and pipe piece 18 are joined by a connection 20.
• Converter 19 is once again connected on its outlet side to a further pipe piece 21 which leads to the further components of the exhaust system.
• a connection 22 is arranged between converter 19 and pipe piece 21.
• pipe piece 18 is provided with a separating wall 23 whereby pipe piece 18 comprises two different passages 24 respectively 25. So as to prevent short-circuit between the gas flows occurring in both passages 24 respectively 25, it is important that the gas flows are only combined with each other after a certain distance. Earlier combining would result in a kind of short-circuit of both flows, whereby mutual influencing would occur which would have a negative effect on the efficiency of the engine. In modern automobiles it is important that the catalytic converter be placed as close as possible to the engine, on the one hand to bring converter 19 as quickly as possible to the desired operating temperature and on the other to maintain this temperature. This will result in the most effective possible use of the catalytic converter.
• the present invention makes surprising use of this property by causing the structure forming the separating walls of the catalytic converter to extend to a point at least a short distance from separating wall 23.
• the separation between passages 24 and 25 is herein maintained into the catalytic converter. Because connection 20 further allows an angular displacement of the axes of pipe piece 18 and catalytic converter 19 and the converter structure extends as a sphere, this separation is maintained, also in the case of small angular displacements.
• Separating wall 23 will of course not always connect directly onto the separating walls of the catalytic converter, since these latter often have a triangular or hexagonal structure. Given the small cross- section of the channels, the effect thereof is negligible .
• boundary surface between the catalytic converter and the first pipe piece takes a convex form and the second boundary surface is concave. All converter channels thus have the same length.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Exhaust Gas After Treatment (AREA)
• Exhaust Silencers (AREA)
• Joints Allowing Movement (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=19766316

Family Applications (1)

Country Status (5)

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Family Cites Families (4)

• 1998
  • 1998-01-08 NL NL1007986A patent/NL1007986C2/nl not_active IP Right Cessation
  • 1998-12-21 EP EP98962695A patent/EP1044340A1/en not_active Withdrawn
  • 1998-12-21 KR KR1020007007556A patent/KR20010033971A/ko not_active Application Discontinuation
  • 1998-12-21 WO PCT/NL1998/000723 patent/WO1999035431A1/en not_active Application Discontinuation
  • 1998-12-21 JP JP2000527780A patent/JP2002500334A/ja active Pending

Non-Patent Citations (1)

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