WO2016084646A1 - 排気システムにおける排気管同士を連結する球面継手の配置位置決定方法および排気システム - Google Patents
排気システムにおける排気管同士を連結する球面継手の配置位置決定方法および排気システム Download PDFInfo
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- WO2016084646A1 WO2016084646A1 PCT/JP2015/082159 JP2015082159W WO2016084646A1 WO 2016084646 A1 WO2016084646 A1 WO 2016084646A1 JP 2015082159 W JP2015082159 W JP 2015082159W WO 2016084646 A1 WO2016084646 A1 WO 2016084646A1
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- Prior art keywords
- exhaust system
- spherical
- spherical joint
- exhaust
- peripheral surface
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Classifications
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- 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
- F01N13/1883—Construction facilitating manufacture, assembly, or disassembly manufactured by hydroforming
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- 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
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- 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
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- 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
- F01N1/00—Silencing apparatus characterised by method of silencing
-
- 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
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- 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
- F01N13/1838—Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
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- 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
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- 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
- F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
Definitions
- the present invention relates to an exhaust system for exhausting exhaust gas from an engine such as an automobile, and more particularly to a spherical joint that connects exhaust pipes arranged in the middle of an exhaust system in order to reduce vibration transmitted from the engine to a vehicle body.
- the present invention relates to a method for determining the arrangement position.
- Patent Document 1 discloses an exhaust system for exhausting exhaust gas of an engine horizontally placed on the front of a vehicle from the rear of the vehicle, and a portion of the exhaust pipe extending substantially linearly in the front-rear direction of the vehicle and the exhaust pipe Discloses an exhaust system in which portions that extend substantially linearly in the left-right direction of the vehicle are provided, and a spherical joint is disposed in each portion.
- the vibration in the vertical direction of the vehicle can be damped by the spherical joint disposed at the portion where the exhaust pipe extends substantially linearly in the longitudinal direction of the vehicle, and the exhaust pipe is
- the vibration in the front-rear direction of the vehicle can be damped by the spherical joint disposed in the portion extending substantially linearly.
- the spherical joint when the spherical joint is arranged at a location where the upstream side and the downstream side move in the vertical direction, the horizontal direction, or the front-rear direction synchronously, There may be a case where a bending moment greater than the torque that generates the maximum static frictional force does not occur between the spherical inner peripheral surface and the spherical outer peripheral surface that make up the joint. In this case, since the spherical inner peripheral surface and the spherical outer peripheral surface do not slide, vibration cannot be attenuated. This point is not taken into consideration in the conventional exhaust system using the spherical joint.
- the present invention has been made in view of the above circumstances, and an object of the present invention is to determine the arrangement position of a spherical joint for connecting exhaust pipes in an exhaust system, which can more effectively reduce vibration transmitted from an engine to a vehicle body, and It is to provide an exhaust system.
- a predetermined vibration is added to the exhaust system (for example, a vibration assumed in an engine to be mounted on an automobile or the like in which the exhaust system is employed).
- the spherical joint is disposed at a location where a bending moment greater than the torque that generates the maximum static frictional force is generated between the spherical inner peripheral surface and the spherical outer peripheral surface constituting the spherical joint.
- the present invention is a method for determining the position of a spherical joint that connects exhaust pipes in an exhaust system that exhausts exhaust gas from an engine.
- a predetermined vibration is applied to the upstream end of the exhaust system, a maximum static frictional force is generated between the spherical inner peripheral surface and the spherical outer peripheral surface that are in contact with each other and constitute the spherical joint.
- a point where a bending moment greater than the torque to be generated is detected from the exhaust system; The detected location is determined as an arrangement position of the spherical joint in the exhaust system.
- strain gauges are attached to a plurality of locations of the exhaust system, and simulated vibrations simulating the vibration of the engine are applied to the upstream end of the exhaust system, and the bending strain measured at each strain gauge at that time Accordingly, a location where a bending moment greater than the torque that generates the maximum static frictional force is generated between the spherical inner peripheral surface and the spherical outer peripheral surface, which are in contact with each other, constituting the spherical joint may be detected.
- the spherical joint is configured by performing a CAE (Computer Aided Engineering) analysis and obtaining a stress distribution when a simulated vibration imitating the vibration of the engine is applied to the upstream end of the exhaust system. You may detect the location where the bending moment more than the torque which generate
- CAE Computer Aided Engineering
- the present invention is also an exhaust system for exhausting engine exhaust gas, Multiple exhaust pipes, A spherical joint for connecting the exhaust pipes together,
- the spherical joint is More than a torque that generates a maximum static frictional force between the spherical inner peripheral surface and the spherical outer peripheral surface that are in contact with each other and constitute the spherical joint when a predetermined vibration is applied to the exhaust system from the engine It is arranged at the place where the bending moment of.
- the maximum static frictional force is generated between the spherical inner peripheral surface and the spherical outer peripheral surface that are in contact with each other and constitute the spherical joint. Since spherical joints are placed where bending moments greater than the torque to be generated occur, more sliding can occur between the spherical inner peripheral surface and spherical outer peripheral surface of the spherical joint. Accordingly, vibration transmitted from the engine to the vehicle body via the exhaust system can be more efficiently reduced.
- FIG. 1 is a schematic diagram of an exhaust system 1 in which a spherical joint 2 is arranged at a position determined by an arrangement position determining method according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view of the spherical joint 2.
- FIG. 3A and FIG. 3B are diagrams for explaining the operating principle of the spherical joint 2.
- FIG. 4 is a flowchart of the arrangement position determination method according to the embodiment of the present invention.
- the arrangement position determination method determines the arrangement position of the spherical joint 2 suitable for attenuating vibration transmitted from the engine in the exhaust system 1 such as an automobile.
- FIG. 1 is a schematic diagram of an exhaust system 1 in which a spherical joint 2 is arranged at a position determined by the arrangement position determining method according to the present embodiment.
- the exhaust system 1 includes a center muffler 3a disposed at the center of a body (not shown) such as an automobile on which the exhaust system 1 is mounted and a rear muffler 3b disposed rearward (hereinafter referred to simply as the muffler 3).
- the exhaust system 1 is disposed between an engine (not shown) such as an automobile (not shown) and the center muffler 3a and between the center muffler 3a and the rear muffler 3b.
- a plurality of exhaust pipes 4a to 4d (hereinafter also simply referred to as exhaust pipes 4) for discharging from 3b, and arranged between the muffler 3 and the exhaust pipe 4 or between the exhaust pipe 4 and the exhaust pipe 4 A spherical joint 2.
- the spherical joints 2 are arranged at a total of four locations in between.
- the arrangement position and the number of arrangement of the spherical joints 2 are determined based on the arrangement position determination method according to the present embodiment, and FIG. It is not limited to the example shown.
- a fixed joint is provided between the muffler 3 and the exhaust pipe 4 where the spherical joint 2 is not disposed, and between the exhaust pipe 4 and the exhaust pipe 4 (between the center muffler 3a and the exhaust pipe 4c in FIG. 1).
- 5 is arranged. Instead of arranging the fixed joint 5, both may be welded, or both may be integrally formed.
- the exhaust system 1 includes the two mufflers 3a and 3b and the four exhaust pipes 4a to 4d. The configuration of these exhaust systems 1 is appropriately changed depending on the automobile or the like on which the exhaust system 1 is mounted.
- the spherical joint 2 comes into contact with each other constituting the spherical joint 2 between the muffler 3 and the exhaust pipe 4 and between the exhaust pipe 4 and the exhaust pipe 4 based on the arrangement position determination method according to the present embodiment. They are arranged at locations where a bending moment greater than the torque that generates the maximum static frictional force is generated between the spherical inner peripheral surface 26 and the spherical outer peripheral surface 27 (see FIG. 2).
- FIG. 2 is a cross-sectional view of the spherical joint 2 according to the embodiment of the present invention.
- the spherical joint 2 includes a flange 20 attached to an end of one of the two coupling objects (the muffler 3 and the exhaust pipe 4 or the exhaust pipe 4 and the exhaust pipe 4) coupled to each other.
- An insertion port 21 that is formed inwardly in the axial direction of the one connection target (the + O direction in FIG. 2) and connects to the exhaust path of the one connection target, and the other connection target to which the flange 22 is attached.
- the insertion part 23 which is an edge part, and the bolt 24 with a spring and the nut 25 which connect two connection object are provided.
- Bolt holes 28 and 29 are formed in the flanges 20 and 22, and the spring-loaded bolt 24 is screwed into the nut 25 through the bolt holes 28 and 29, thereby inserting the insertion portion 23 into the insertion port 21.
- the two objects to be connected are connected while being urged in the direction of insertion.
- the insertion port 21 is formed with a spherical inner peripheral surface 26.
- the insertion portion 23 is attached to an end portion of a connection target to which a flange 22 is attached by a cylindrical sliding member 30 having a spherical outer peripheral surface 27 having substantially the same diameter as the inner peripheral surface 26 of the insertion port 21. Is formed.
- the sliding member 30 includes a reinforcing material such as a wire mesh and a heat resistant material such as expanded graphite.
- the inner peripheral surface 26 of the insertion port 21 and the outer peripheral surface 27 of the sliding member 30 of the insertion portion 23 are biased in the direction in which the insertion portion 23 is inserted into the insertion port 21 by the spring-loaded bolt 24 and the nut 25. , Contact each other.
- the maximum static frictional force of the inner peripheral surface 26 of the insertion port 21 and the outer peripheral surface 27 of the insertion portion 23 that are in contact with each other is determined by the friction characteristics of the inner peripheral surface 26 and the outer peripheral surface 27, the spring-loaded bolt 24 and the nut 25. And an urging force (a force pressing the insertion portion 23 against the insertion port 21).
- the insertion port 21 is integrally formed at the end of one of the two coupling objects (the muffler 3 and the exhaust pipe 4 or the exhaust pipe 4 and the exhaust pipe 4) that are coupled to each other.
- the formed flange 20 is attached and the sliding member 30 constituting the flange 22 and the insertion portion 23 is attached to the other end to be connected, the present invention is not limited to this.
- the flange 20 and the insertion port 21 may be integrally formed at one end of the connection target.
- 3 (A) and 3 (B) are diagrams for explaining the operation principle of the spherical joint 2.
- the spherical joint 2 generates a maximum static frictional force between the inner peripheral surface 26 of the insertion port 21 and the outer peripheral surface 27 of the sliding member 30 of the insertion portion 23 that are in contact with each other. Sliding occurs when a bending moment greater than torque T (torque centered on the center O of the sphere identified by the inner peripheral surface 26) occurs. Thereby, the vibration transmitted from the upstream (engine) side to the downstream (rear muffler 3b) side of the spherical joint 2 can be attenuated.
- torque T torque centered on the center O of the sphere identified by the inner peripheral surface 26
- FIG. 4 is a flowchart of the arrangement position determination method according to the present embodiment.
- Step S1 Exhaust system 1 setting (without spherical joint 2)
- the exhaust system 1 without the spherical joint 2 may be one in which the muffler 3 and the exhaust pipe 4 are integrally formed, or the exhaust system 1 between the muffler 3 and the exhaust pipe 4 by the fixed joint 5, welding, and the like.
- the pipe 4 and the exhaust pipe 4 may be rigidly connected.
- the exhaust system 1 is fixed to a predetermined jig via the mounter at the same mounting position of the mounter (hanging rubber or the like) as the case where the exhaust system 1 is attached to a vehicle body such as an automobile in which the exhaust system 1 is adopted. . Thereby, the attachment state to the vehicle body of the exhaust system 1 is reproduced.
- Step S2 Strain gauge installation In the exhaust system 1, positions where the spherical joint 2 can be arranged, for example, a connection part between the muffler 3 and the exhaust pipe 4, a connection part between the exhaust pipe 4 and the exhaust pipe 4, and the exhaust pipe 4 Attach a strain gauge to the bent part.
- Step S3 Input of engine simulated vibration A vibration assumed in an engine to be mounted on an automobile or the like in which the exhaust system 1 is employed is generated as a simulated engine vibration, and this simulated vibration is upstream of the exhaust system 1. It inputs into the exhaust pipe 4a which is (engine side).
- Step S4 Strain measurement / bending moment calculation
- the pipe shaft at each possible position with a strain gauge attached to each possible position of the spherical joint 2 Measure the bending strain in the direction. Then, for each position where the spherical joint 2 can be placed, a bending moment is calculated using the measured bending strain and the section modulus and Young's modulus of the muffler 3 or the exhaust pipe 4 at the place where the spherical joint 2 can be placed.
- Step S5 Check of engine simulated vibration at all frequencies Check the engine to be installed in the engine, etc., in which the exhaust system 1 is adopted at every frequency of the engine simulated vibration, specifically, every predetermined frequency interval. It is checked whether or not Steps S3 and S4 are performed at all frequencies selected from the assumed frequency band of vibration. If steps S3 and S4 are not performed at all frequencies of engine simulation vibration ("NO" in step S5), that is, if there is a frequency at which steps S3 and S4 are not performed, the process returns to step S3. Steps S3 and S4 are performed for this frequency. On the other hand, when steps S3 and S4 are performed for all frequencies ("YES" in step S5), the process proceeds to step S6.
- Step S6 Determination of position candidate position of spherical joint 2
- Position position candidate positions of the spherical joint 2 are determined based on bending moments at positions where the spherical joint 2 can be arranged at each frequency of engine simulated vibration. For example, for each simulated vibration frequency of the engine, the maximum value of the bending moment is set to 1, and the bending moment ratio at each position where the spherical joint 2 can be arranged is calculated. Then, for each simulated vibration frequency of the engine, a position where the spherical joint 2 having a bending moment ratio of a predetermined value (for example, 0.9) or more can be placed is determined as a placement candidate position for the spherical joint 2.
- a predetermined value for example, 0.9
- the frequency of the simulated vibration for determining the arrangement candidate position of the spherical joint 2 may be narrowed down.
- Step S7 Exhaust system 1 setting (with spherical joint 2)
- the exhaust system 1 which is assembled without the spherical joint 2 in step S1 and is fixed to a predetermined jig via a mounter, and the state of attachment to the vehicle body is reproduced, the connection portion between the muffler 3 and the exhaust pipe 4 and the exhaust Of the connection parts between the pipe 4 and the exhaust pipe 4, the connection part determined as the position candidate position of the spherical joint 2 is replaced with the spherical joint 2.
- Step S8 Attaching the acceleration sensor A mounter for fixing the exhaust system 1 to a predetermined jig is installed at the same position as the case where the exhaust system 1 is attached to a vehicle body such as an automobile in which the exhaust system 1 is adopted. Install the acceleration sensor.
- Step S9 Input of engine simulated vibration A vibration assumed in an engine to be mounted on an automobile or the like that employs the exhaust system 1 is generated as a simulated engine vibration, and this simulated vibration is upstream of the exhaust system 1. To the exhaust pipe 4a.
- Step S10 Acceleration measurement In a state where simulated engine vibration is applied from the upstream side of the exhaust system 1, acceleration is measured by an acceleration sensor attached to a mounter for fixing the exhaust system 1 to a predetermined jig. .
- Step S11 Implementation check at all frequencies of engine simulated vibrations All frequencies of engine simulated vibrations, specifically vibration frequencies assumed for engines planned to be installed in automobiles and the like that employ exhaust system 1 It is checked whether or not Steps S9 and S10 are performed at all frequencies selected from the band at every predetermined frequency interval. When steps S9 and S10 are not performed at all frequencies of engine simulation vibration ("NO" in step S11), that is, if there is a frequency at which steps S9 and S10 are not performed, the process returns to step S9. Steps S9 and S10 are performed for this frequency. On the other hand, when steps S9 and S10 are performed at all resonance frequencies (“YES” in step S9), the process proceeds to step S12.
- Step S12 Determination of the Arrangement Position of the Spherical Joint 2
- the arrangement position of the spherical joint 2 is determined based on the measured values of the acceleration sensor at each frequency of the simulated vibration of the engine. For example, it is checked whether the measured value of the acceleration sensor is equal to or lower than a predetermined reference value for each engine vibration frequency. When the measured value of the acceleration sensor is equal to or smaller than a predetermined reference value, the maximum is between the spherical inner peripheral surface 26 and the spherical outer peripheral surface 27 of the spherical joint 2 arranged at the arrangement candidate position. A bending moment greater than the torque that generates a static frictional force is generated, and the inner peripheral surface 26 and the outer peripheral surface 27 slide.
- the arrangement candidate position is determined as the arrangement position of the spherical joint 2.
- strain gauges are attached to a plurality of locations of the exhaust system 1, and the engine simulated vibration is applied to the upstream end of the exhaust system 1 at each frequency of the engine simulated vibration.
- Torque that generates the maximum static frictional force between the spherical inner peripheral surface 26 and the spherical outer peripheral surface 27 that are in contact with each other and constitute the spherical joint 2 based on the bending strain in the tube axis direction measured by the gauge The position where the above bending moment occurs is detected, and the detected position is determined as the arrangement position of the spherical joint 2.
- the frequency of the simulated vibration of the engine (specifically, a predetermined frequency interval from the frequency band of vibration assumed in an engine to be mounted on an automobile or the like in which the exhaust system 1 is employed).
- the position at which a bending moment greater than the torque that generates the torque is generated is determined as the arrangement position of the spherical joint 2.
- the present invention is not limited to this.
- the present invention provides a spherical joint 2 when a predetermined vibration (for example, any vibration assumed in an engine to be installed in an automobile or the like in which the exhaust system 1 is applied) is applied from the engine to the exhaust system 1.
- a predetermined vibration for example, any vibration assumed in an engine to be installed in an automobile or the like in which the exhaust system 1 is applied
- the position where the bending moment greater than the torque that generates the maximum static friction force between the inner peripheral surface 26 and the outer peripheral surface 27 is determined as the arrangement position of the spherical joint 2.
- strain gauges are attached to a plurality of locations of the exhaust system 1, and predetermined vibrations are applied to the upstream end of the exhaust system 1, and the tube shafts measured by the respective strain gauges at that time. Based on the bending strain in the direction, the position where a bending moment greater than the torque that generates the maximum static frictional force is detected between the inner peripheral surface 26 and the outer peripheral surface 27 of the spherical joint 2 is detected.
- the present invention is not limited to this.
- CAE Computer Aided Engineering
- a stress distribution when a predetermined vibration is applied to the upstream end of the exhaust system 1 is obtained, and based on this stress distribution, the inner peripheral surface 26 of the spherical joint 2 You may detect the location where the bending moment more than the torque which generate
- the stress distribution of the spherical joint 2 is obtained by CAE analysis, and the bending moment at each position where the spherical joint 2 can be arranged is based on the obtained stress distribution. Is calculated.
- the bending moment ratio at each position where the spherical joint 2 can be arranged is calculated, and the bending moment ratio is a predetermined value (for example, 0.9) or more for each frequency of engine simulated vibration.
- the position where the spherical joint 2 can be arranged may be determined as an arrangement candidate position of the spherical joint 2.
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Manufacturing & Machinery (AREA)
- Exhaust Silencers (AREA)
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- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
Abstract
Description
前記排気システムの上流側の端部に所定の振動を加えた場合に、前記球面継手を構成する互いに接触する球面状の内周面と球面状の外周面との間に最大静止摩擦力を発生させるトルク以上の曲げモーメントが発生する箇所を、前記排気システムから検出し、
前記検出した箇所を前記排気システムにおける前記球面継手の配置位置に決定する。
複数の排気管と、
前記排気管同士を連結する球面継手と、を備え、
前記球面継手は、
前記エンジンから所定の振動が前記排気システムに加わった場合に、前記球面継手を構成する互いに接触する球面状の内周面と球面状の外周面との間に最大静止摩擦力を発生させるトルク以上の曲げモーメントが発生する箇所に配置される。
まず、球面継手2なしの排気システム1を用意する。球面継手2なしの排気システム1は、マフラー3および排気管4が一体的に形成されたものでもよいし、あるいは、固定継手5、溶接等により、マフラー3と排気管4との間、および排気管4と排気管4との間を剛結したものでもよい。つぎに、排気システム1が採用される自動車等の車体にこの排気システム1を取り付ける場合と同じマウンタ(吊ゴム等)の取付位置において、マウンタを介して所定の治具に排気システム1を固定する。これにより、排気システム1の車体への取り付け状態を再現する。
排気システム1において、球面継手2の配置可能位置、例えば、マフラー3と排気管4との連結部、排気管4と排気管4との連結部、および排気管4の屈曲部等に、ひずみゲージを取り付ける。
排気システム1が採用される自動車等に搭載予定のエンジンにて想定される振動を、エンジンの模擬振動として生成し、この模擬振動を排気システム1の上流側(エンジン側)である排気管4aに入力する。
排気システム1の上流側からエンジンの模擬振動が加えられた状態において、球面継手2の各配置可能位置に取り付けられたひずみゲージで各配置可能位置における管軸方向の曲げひずみを測定する。そして、球面継手2の配置可能位置毎に、測定した曲げひずみと、配置可能位置にあるマフラー3あるいは排気管4の断面係数およびヤング率とを用いて、曲げモーメントを算出する。
エンジンの模擬振動の全周波数、具体的には、所定の周波数間隔毎に、排気システム1が採用される自動車等に搭載予定のエンジンにて想定される振動の周波数帯域から選択されたすべての周波数において、ステップS3、S4が実施されているか否かをチェックする。エンジンの模擬振動の全周波数において、ステップS3、S4が実施されていない場合(ステップS5で「NO」)、つまり、ステップS3、S4が実施されていない周波数があるならば、ステップS3に戻り、この周波数についてステップS3、S4を実施する。一方、全周波数においてステップS3、S4が実施されている場合(ステップS5で「YES」)、ステップS6に進む。
エンジンの模擬振動の各周波数における球面継手2の配置可能位置各々における曲げモーメントに基づいて、球面継手2の配置候補位置を決定する。例えば、エンジンの模擬振動の周波数毎に、曲げモーメントの最大値を1として、球面継手2の配置可能位置各々における曲げモーメント比を算出する。そして、エンジンの模擬振動の周波数毎に、曲げモーメント比が所定値(例えば0.9)以上である球面継手2の配置可能位置を、球面継手2の配置候補位置に決定する。この際、エンジンの模擬振動の各周波数における曲げモーメントの最大値に基づいて(例えば曲げモーメントの最大値の大きい順に)、球面継手2の配置候補位置を決定する模擬振動の周波数を絞り込んでもよい。
ステップS1により球面継手2なしで組み立てられ、マウンタを介して所定の冶具に固定されることにより車体への取り付け状態が再現された排気システム1において、マフラー3と排気管4との連結部分および排気管4と排気管4との連結部分のうち、球面継手2の配置候補位置に決定された連結部分を固定継手5から球面継手2に置き換える。
排気システム1が採用される自動車等の車体にこの排気システム1を取り付ける場合と同じ位置に設置され、排気システム1を所定の治具に固定するためのマウンタに、加速度センサを取り付ける。
排気システム1が採用される自動車等に搭載予定のエンジンにて想定される振動を、エンジンの模擬振動として生成し、この模擬振動を排気システム1の上流側である排気管4aに入力する。
排気システム1の上流側からエンジンの模擬振動が加えられた状態において、この排気システム1を所定の治具に固定するためのマウンタに取り付けられた加速度センサで加速度を測定する。
エンジンの模擬振動の全周波数、具体的には、排気システム1が採用される自動車等に搭載予定のエンジンにて想定される振動の周波数帯域から、所定の周波数間隔毎に選択されたすべての周波数において、ステップS9、S10が実施されているか否かをチェックする。エンジンの模擬振動の全周波数において、ステップS9、S10が実施されていない場合(ステップS11で「NO」)、つまり、ステップS9、S10が実施されていない周波数があるならば、ステップS9に戻り、この周波数についてステップS9、S10を実施する。一方、全共振周波数において、ステップS9、S10が実施されている場合(ステップS9で「YES」)、ステップS12に進む。
エンジンの模擬振動の各周波数における加速度センサの測定値に基づいて、球面継手2の配置位置を決定する。例えば、エンジンの模擬振動の周波数毎に、加速度センサの測定値が所定の基準値以下となっているか否かを調べる。加速度センサの測定値が所定の基準値以下となっている場合、配置候補位置に配置された球面継手2の互いに接触する球面状の内周面26と球面状の外周面27との間に最大静止摩擦力を発生させるトルク以上の曲げモーメントが発生して、この内周面26と外周面27とが摺動し、その結果、マウンタを介して排気システム1から所定の治具に伝わる振動が低減しているものと考えられる。そこで、エンジンの模擬振動の各周波数において、加速度センサの測定値が所定の基準値以下となっている場合は、配置候補位置を球面継手2の配置位置に決定する。
Claims (5)
- エンジンの排気ガスを排出する排気システムにおける排気管同士を連結する球面継手の配置位置決定方法であって、
前記排気システムの上流側の端部に所定の振動を加えた場合に、前記球面継手を構成する互いに接触する球面状の内周面と球面状の外周面との間に最大静止摩擦力を発生させるトルク以上の曲げモーメントが発生する箇所を、前記排気システムから検出し、
前記検出した箇所を前記排気システムにおける前記球面継手の配置位置に決定する
ことを特徴とする排気システムにおける球面継手の配置位置決定方法。 - 請求項1に記載の排気システムにおける球面継手の配置位置決定方法であって、
前記排気システムの複数箇所にひずみゲージを取り付けて、前記排気システムの上流側の端部に前記エンジンの振動を模した模擬振動を加え、そのときに各ひずみゲージで測定された曲げひずみに基づいて、前記球面継手を構成する互いに接触する球面状の内周面と球面状の外周面との間に最大静止摩擦力を発生させるトルク以上の曲げモーメントが発生する箇所を検出する
ことを特徴とする排気システムにおける排気管同士を連結する球面継手の配置位置決定方法。 - 請求項1に記載の排気システムにおける排気管同士を連結する球面継手の配置位置決定方法であって、
CAE(Computer Aided Engineering)解析により、前記排気システムの上流側の端部に前記エンジンの振動を模した模擬振動を加えたときの応力分布を求め、当該応力分布に基づいて、前記球面継手を構成する互いに接触する球面状の内周面と球面状の外周面との間に最大静止摩擦力を発生させるトルク以上の曲げモーメントが発生する箇所を検出する
ことを特徴とする排気システムにおける排気管同士を連結する球面継手の配置位置決定方法。 - 請求項2または3に記載の排気システムにおける排気管同士を連結する球面継手の配置位置決定方法であって、
前記エンジンの模擬振動の周波数毎に、前記エンジンの模擬振動を前記排気システムの上流側の端部に加えた場合に、前記球面継手を構成する互いに接触する球面状の内周面と球面状の外周面との間に最大静止摩擦力を発生させるトルク以上の曲げモーメントが発生する箇所を、前記排気システムから検出する
ことを特徴とする排気システムにおける排気管同士を連結する球面継手の配置位置決定方法。 - エンジンの排気ガスを排出する排気システムであって、
複数の排気管と、
前記排気管同士を連結する球面継手と、を備え、
前記球面継手は、
前記エンジンから前記排気システムに所定の振動が加わった場合に、前記球面継手を構成する互いに接触する球面状の内周面と球面状の外周面との間に最大静止摩擦力を発生させるトルク以上の曲げモーメントが発生する箇所に配置される
ことを特徴とする排気システム。
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