CN211174293U - Automobile muffler fixing support - Google Patents
Automobile muffler fixing support Download PDFInfo
- Publication number
- CN211174293U CN211174293U CN201921634321.1U CN201921634321U CN211174293U CN 211174293 U CN211174293 U CN 211174293U CN 201921634321 U CN201921634321 U CN 201921634321U CN 211174293 U CN211174293 U CN 211174293U
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- lug
- rubber
- mounting hole
- hole
- tray
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- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
- Exhaust Silencers (AREA)
Abstract
The utility model relates to the technical field of automobile parts, in particular to an automobile muffler fixing support, which comprises a heat insulation support and a lug component, wherein the lug component comprises a rubber lug and a lug tray, the edge of the lug tray is provided with a hem which has the same appearance structure with the rubber lug, the heat insulation support is a bracket in a shape of Chinese character ji, the heat insulation support is provided with a through hole, the rubber lug is in a structure of Chinese character ji, two ends of the rubber lug are respectively provided with a mounting hole, the heat insulation support is fixedly connected with the lug through the through hole and the mounting hole by a bolt, the lug tray is provided with a avoiding hole for avoiding the bolt, the utility model has simple structure, wide lower part and compact upper part, reduces the displacement of the support and the rubber lug under severe working conditions, the rubber mounting tray can play a heat insulation role, and protects the rubber lug to a certain extent, reducing the heat radiation of the exhaust system.
Description
Technical Field
The utility model relates to an auto parts technical field specifically is an automobile silencer fixed bolster.
Background
The exhaust system of the automobile is mainly used for exhausting the waste gas generated by the operation of the engine, and simultaneously, the pollution and the noise of the exhausted waste gas are reduced. And the fixed support of the exhaust system mainly plays a role in damping and reducing noise and prolonging the service life of the exhaust system.
The prior automobile silencer generally comprises an exhaust lifting hook, a rubber lifting lug and a lower automobile body welding lifting hook which are welded on an exhaust pipe, and the strength analysis of the exhaust system lifting hook shows that when the lower automobile body lifting hook is subjected to stress decomposition, the X-direction (or Y-direction) displacement generated by the lifting hook and rubber can reduce the distance between the rubber lifting lug and a heat source under the severe working condition.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a car silencer fixed bolster to solve the problem that proposes among the above-mentioned background art.
The technical scheme of the utility model is that:
the utility model provides an automobile muffler fixed bolster, the fixed bolster is including thermal-insulated support and lug subassembly, the lug subassembly is including rubber lug and lug tray, the edge of lug tray is provided with the hem the same with rubber lug appearance structure, thermal-insulated support is nearly font support, be provided with the through-hole on the thermal-insulated support, the rubber lug is well font structure, the both ends of rubber lug are provided with the mounting hole respectively, thermal-insulated support runs through-hole and mounting hole and lug fixed connection through the bolt, the rubber lug is placed in the lug tray, and the lug tray is provided with the hole of dodging that is used for dodging the bolt.
Furthermore, the heat insulation support comprises a connecting surface for supporting the rubber lifting lug and two flange surfaces I which are integrally formed on two sides of the connecting surface, the flange surfaces I are perpendicular to the connecting surface, a flange surface II with an arc surface structure is integrally formed on the side edge of the flange surface I, which is far away from the connecting surface, and the central line of the flange surface II is perpendicular to the flange surface I.
Further, the mounting holes at the two ends of the rubber lifting lug are divided into a first mounting hole and a second mounting hole, the bolt penetrates through the second mounting hole and is fixedly connected with the heat insulation support, the first mounting hole is hinged to the bottom of the car body through a hinge shaft, the center lines of the first mounting hole and the second mounting hole are perpendicular to each other, the center line of the first mounting hole is perpendicular to the second flange face, and the center line of the second mounting hole is perpendicular to the connecting face.
Furthermore, the avoiding hole of the lifting lug tray can coincide with the central line of the second mounting hole, and the folded edge is arranged around one end, close to the second mounting hole, of the rubber lifting lug.
Furthermore, the center of the rubber lifting lug is provided with an I-shaped hole.
Furthermore, the side edge of the lifting lug tray, which is far away from the avoiding hole, is provided with a limiting flange.
The utility model discloses an improve and provide a car silencer fixed bolster here, compare with prior art, have following improvement and advantage:
one is as follows: the utility model has the advantages of simple structure, the wide big upper portion of lower part is compact, guarantees the stability of installation, reduces the displacement volume of support and rubber lug under abominable operating mode, reduces occupation space.
The second step is as follows: the rubber mounting tray can play a thermal insulation role, protect the rubber lifting lug to a certain extent, and reduce the heat radiation of an exhaust system.
And thirdly: the utility model discloses the fixed bolster is arranged in car silencer both sides, reduces the heat radiation that rubber receives.
Fourthly, the method comprises the following steps: the displacement of support and rubber is reduced to the greatest extent to reduce the heat radiation of the exhaust pipeline to the rubber, so that the stability and the aging resistance of the fixed support are improved.
Drawings
The invention is further explained below with reference to the figures and examples:
FIG. 1 is a schematic perspective view of the fixing bracket and the muffler of the automobile according to the present invention;
fig. 2 is a schematic perspective view of the first embodiment of the present invention;
fig. 3 is a schematic perspective view of the second embodiment of the present invention;
FIG. 4 is a simplified schematic diagram of heat transfer between the heat insulating support and the rubber lifting lug of the muffler of the present invention;
description of reference numerals:
the automobile silencer comprises an automobile silencer 1, a fixing support 2, a rubber lifting lug 3, a first mounting hole 31, an I-shaped hole 33, a lifting lug tray 4, a folded edge 41, a limiting flange 42, a bolt 5, a heat insulation support 6, a connecting surface 61, a first flange surface 62 and a second flange surface 63.
Detailed Description
The present invention will be described in detail below, and it is apparent that the technical solutions in the embodiments of the present invention are described clearly and completely. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model provides an automobile muffler fixing support through the improvement, as shown in figures 1-4, the fixing support 2 comprises a heat insulation support 6 and a lug assembly, the lug assembly comprises a rubber lug 3 and a lug tray 4, the edge of the lug tray 4 is provided with a hem 41 which has the same appearance structure with the rubber lug 3, the heat insulation support 6 is a bracket in a shape of Chinese character ji, a through hole is arranged on the heat insulation support 6, the rubber lug 3 is in a structure in a shape of Chinese character ji, mounting holes are respectively arranged at two ends of the rubber lug 3, the heat insulation support 6 is fixedly connected with the lug through the through hole and the mounting hole by a bolt 5, the rubber lug 3 is placed in the lug tray 4, the lug tray 4 is provided with a avoiding hole for avoiding the bolt 5, the fixing support 2 is arranged at two sides of the automobile muffler 1, the heat insulation support 6 is welded at the automobile muffler 1, rubber lug 3 articulates in the bottom of automobile body, the utility model relates to a car silencer 1 separates heat support 6, can make rubber lug 3 install in car silencer 1 separates heat support 6, reduces the influence volume of thermal radiation.
The utility model discloses a based on structure atress and heat transfer basis on propose, to cargo vehicle, under most conditions, customer's service condition can overload, so exhaust system's heat than normally load under the condition big, the temperature on blast pipeline surface risees.
The exhaust system of a common passenger car adopts a lifting hook and lifting lug combined type, the combination has the advantage of simple arrangement, but the requirement of a client on the riding comfort is higher, namely the comprehensive requirement on the structural strength, rigidity and mode of the lifting hook is higher. For the truck, because the severe service condition is full load or overload, the heating value of the corresponding engine is high, the radiation heat of the exhaust system is large, and in this state, if the exhaust hook is welded on the exhaust pipeline, the rubber lifting lug 3 is subjected to the dual functions of force and heat radiation for a long time, so that the accelerated aging of the rubber material is caused.
The utility model relates to a thermal-insulated support 6 of car silencer 1 can make rubber lug 3 install in thermal-insulated support 6 of car silencer 1, reduces the influence volume of thermal radiation.
The heat insulation support 6 comprises a connecting surface 61 for supporting the rubber lifting lug 3 and two flange surfaces I62 which are integrally formed on two sides of the connecting surface 61, the flange surfaces I62 are perpendicular to the connecting surface 61, the flange surfaces II 63 of an arc surface structure are integrally formed on the side edge, away from the connecting surface 61, of the flange surfaces I62, the center line of the flange surfaces II 63 is perpendicular to the flange surfaces I62, and the flange surfaces II 63 of the heat insulation support 6 are spot-welded on the automobile muffler 1, so that the heat transfer area is reduced.
The mounting holes at the two ends of the rubber lifting lug 3 are divided into a first mounting hole 31 and a second mounting hole, the bolt 5 penetrates through the second mounting hole to be fixedly connected with the heat insulation support 6, the first mounting hole 31 is hinged to the bottom of the car body through a hinge shaft, the central lines of the first mounting hole 31 and the second mounting hole are perpendicular to each other, the central line of the first mounting hole 31 is perpendicular to the second flange face 63, the central line of the second mounting hole is perpendicular to the connecting face 61, and the rubber lifting lug 3 and the lifting lug tray 4 are fixed on the heat insulation support 6 through the bolt 5.
The avoidance hole of the lifting lug tray 4 can coincide with the central line of the second mounting hole, the folded edge 41 is arranged around one end, close to the second mounting hole, of the rubber lifting lug 3, and the lifting lug tray 4 can also have a heat insulation function.
The center of the rubber lifting lug 3 is provided with an I-shaped hole 33, so that the cost is reduced,
the side edge of the lifting lug tray 4 far away from the avoidance hole is provided with a limiting flange 42.
The utility model provides an automobile muffler fixed bolster, includes following step:
and stress calculation: the linear relationship between the stress and strain of the insulating support 6 in the elastic state is:
σ＝E×…………………………………(1)
σ: stressWhen the heat insulating support 6 is deformed by an external factor, an internal force is generated between the respective portions of the heat insulating support 6, and the internal force per unit area of the stress at a certain point of the cross section to be examined is expressed by MN · m-2(ii) a E: modulus of elasticity in the unit of MN. m-2(ii) a : strain, elongation of the heat insulating support 6 in the same direction as the external force.
The heat insulating support 6 absorbs the elastic deformation work We before starting plastic deformation, and the elastic deformation work that can be absorbed per unit volume is represented by the following formula:
e: modulus of elasticity;
σ: the elastic limit means that when the heat insulating support 6 is subjected to an external force to a certain limit, the deformation disappears and the original shape is restored by removing the external force, and when the external force is continuously increased, the plastic deformation is generated until the breakage, and the unit is MN · m-2；e: maximum elastic strain, maximum elongation of the heat insulating support 6 in the same direction as the external force.
In the manufacturing process of the material, high specific elastic work is needed, the material can obtain high elastic limit through proper heat treatment, and further obtain high specific work, and the heat insulation support 6 can be selected according to the calculation.
Examples are: common materials are cast iron or stainless steel materials. Taking medium carbon steel and high carbon steel as examples, the elastic modulus E of both is 206800MN m-2Elastic limit σAre respectively 310MN m-2And 970MN m-2 according to the formula
The elastic ratio work of the two is calculated to be 0.23MN m-2And 2.27MN m-2。
From the comparison of the two materials, it can be seen that high carbon steel is more suitable as the fixed support 2 of the exhaust system, which represents the capacity of the metal material to absorb the elastic deformation work, available for the maximum deformation work absorbed per unit volume before the metal starts to deform plastically, the metal of this material absorbing energy or being understood as an internal loss in an irreversible manner when loaded, and releasing the elastic deformation work We when unloaded. The elastic hysteresis characteristic is utilized, and the material can be used for shock absorption materials such as an exhaust system fixing support 2 and a lifting hook of an automobile, so that the aim of stably running the automobile is fulfilled.
The automobile has various working conditions in the driving process, such as acceleration, braking, turning braking, single-hop of front and rear wheels, double-hop of front and rear wheels and the like. In the above working condition process, the heat insulation support 6 needs to meet the requirements of strength and rigidity, so that the requirements of maximum stress and maximum plastic strain can be met when the heat insulation support is loaded under different working conditions.
For the heat conduction between the automobile silencer 1 and the heat insulation support 6, the flat plate heat conduction is adopted, and for the heat insulation support 6 with the metal in the V-shaped cavity, the convection heat transfer characteristic is utilized to simplify the calculation, wherein the Reynolds number of the airflow on the surface of the metal support is Re, and the average convection heat transfer coefficient is Re
And calculating the temperature rise of the air flow in the cavity according to the following simplified model so as to predict the temperature of the rubber lifting lug 3 when the exhaust system works.
As shown in fig. 4, a is a wall surface of a muffler, B is a thickness of a heat insulation support 6, C is a rubber lifting lug 3, heat transfer from an exhaust system to the rubber lifting lug 3 through the heat insulation support 6, and a heat transfer calculation step: the Reynolds number, the heat conduction and the Nussel number of the rubber lifting lug 3 for the heat transfer of the exhaust system are expressed as follows:
the simplified calculation method is that the air flow speed mu is 4m/S, and the kinematic viscosity theta of the air flow is 1.57 × 10-5m2(s) heat conductivity of air k 2.6 × 10-2w·m-2·k-2The section length L of the bracket is 30mm, and the surface area A of the automobile silencer 1 is 0.35m2The heat Q transferred from the vehicle muffler 1 to the bracket is 2.5kw, and the surface temperature T of the vehicle muffler 1 and the exhaust pipe0＝450℃～480℃。
The Reynolds number is calculated as follows:
wherein mu is the airflow speed of the exhaust system, L is the heat transfer length of the exhaust system, and theta is the dynamic viscosity of the airflow of the exhaust system;
the heat conduction formula of the heated rubber lifting lug 3 is as follows:
wherein k is the heat transfer coefficient; t is the actual temperature of the rubber lifting lug 3, T0The initial temperature of the rubber lifting lug 3 is controlled; d0The conventional distance between the rubber lifting lug 3 and a heat source is adopted; d is the actual distance between the rubber lifting lug 3 and a heat source;
the calculation formula of the Knudel number is as follows:
wherein k is the heat transfer coefficient; a is the heat transfer area between the heat insulation support 6 and the rubber lifting lug 3, T is the actual temperature of the rubber lifting lug 3, and T is0The initial temperature of the rubber lifting lug 3 is controlled; d is the actual distance between the rubber lifting lug 3 and a heat source;
at a certain gas flow rate around the exhaust system, the average convective heat transfer coefficient can be expressed as follows:
wherein L is the length of heat transfer of the exhaust system, and k is the heat transfer coefficient;
according to the calculation of the heat exchange quantity, the following results are obtained: when the temperature Δ T is 317 ℃, the temperature T1, which is T0- Δ T, transferred to the rubber lifting lug 3 by the automobile muffler 1 through the heat insulation bracket 6 is a temperature T0- Δ T, and the body temperature of the rubber lifting lug 3 reaches 132-162 ℃ under severe conditions such as full-load climbing conditions.
The rubber material capable of bearing the temperature range can be selected from common ethylene propylene diene monomer EPDM, particularly the ethylene propylene diene monomer crosslinked by peroxide has excellent aging resistance such as ozone resistance, heat resistance, weather resistance and the like, and can be used in the environment with the temperature higher than 150 ℃ without generating cracks.
Based on above simplified calculation, the utility model discloses rubber lug 3 adopts especially with the crosslinked EPT rubber of peroxide, and intensity and ageing resistance can all satisfy the demand that whole car went.
The practical application prospect is as follows:
the automobile is a continuous system, namely the mass and elasticity of the system are distributed on the structure, while the automobile silencer 1 is generally a resistant automobile silencer 1, the silencing principle of the automobile silencer 1 of the type is that the energy of an exhaust system is reduced by arranging internal pipelines and baffles, each small chamber with a pipe in the automobile silencer 1 is equivalent to a mesh hole of a filter, and the mass of air in the pipe is equivalent to electrical inductance and resistance, namely acoustic mass and acoustic resistance. Each ducted cell has its own natural frequency, which, superimposed, tends to cause resonance in the exhaust system. The bracket is welded to the car muffler 1, and its natural frequency can be changed.
From the energy point of view, when the automobile muffler 1 is taken as a whole, under the condition of the same radiation heat, the heat flow density is inversely proportional to the area, and the heat flow density of the airflow on the outer surface of the automobile muffler 1 is reduced due to the energy decline and the radiation area increase in the automobile muffler 1. Therefore, the fixing brackets 2 are arranged on both sides of the automobile muffler 1, and the heat radiation to which the rubber is subjected can be reduced to some extent.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The utility model provides an automobile muffler fixed bolster which characterized in that: fixed bolster (2) are including thermal-insulated support (6) and lug subassembly, the lug subassembly is including rubber lug (3) and lug tray (4), the edge of lug tray (4) is provided with hem (41) the same with rubber lug (3) appearance structure, thermal-insulated support (6) are the style of calligraphy support of several, be provided with the through-hole on thermal-insulated support (6), rubber lug (3) are chinese style of calligraphy structure, the both ends of rubber lug (3) are provided with the mounting hole respectively, thermal-insulated support (6) run through-hole and mounting hole and lug fixed connection through bolt (5), rubber lug (3) are placed in lug tray (4), and lug tray (4) are provided with and are used for dodging avoiding the hole of bolt (5).
2. The automotive muffler fixing bracket according to claim 1, wherein: the heat insulation support (6) comprises a connecting surface (61) used for supporting the rubber lifting lug (3) and two flange surfaces I (62) which are integrally formed on two sides of the connecting surface (61), the flange surfaces I (62) are perpendicular to the connecting surface (61), the flange surfaces I (62) are away from the side edge of the connecting surface (61) and are integrally formed with flange surfaces II (63) of an arc surface structure, and the center line of the flange surfaces II (63) is perpendicular to the flange surfaces I (62).
3. The automotive muffler fixing bracket according to claim 2, wherein: the mounting holes at the two ends of the rubber lifting lug (3) are divided into a first mounting hole (31) and a second mounting hole, the bolt (5) penetrates through the second mounting hole to be fixedly connected with the heat insulation support (6), the first mounting hole (31) is hinged to the bottom of the car body through a hinge shaft, the center lines of the first mounting hole (31) and the second mounting hole are perpendicular to each other, the center line of the first mounting hole (31) is perpendicular to the second flange face (63), and the center line of the second mounting hole is perpendicular to the connecting face (61).
4. The automotive muffler fixing bracket according to claim 1, wherein: the avoidance hole of the lifting lug tray (4) can coincide with the center line of the second mounting hole, and the folded edge (41) is arranged around one end, close to the second mounting hole, of the rubber lifting lug (3).
5. The automotive muffler fixing bracket according to claim 1, wherein: the center of the rubber lifting lug (3) is provided with an I-shaped hole (33).
6. The automotive muffler fixing bracket according to claim 1, wherein: the side edge of the lifting lug tray (4) far away from the avoidance hole is provided with a limiting flange (42).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921634321.1U CN211174293U (en) | 2019-09-28 | 2019-09-28 | Automobile muffler fixing support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921634321.1U CN211174293U (en) | 2019-09-28 | 2019-09-28 | Automobile muffler fixing support |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211174293U true CN211174293U (en) | 2020-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921634321.1U Expired - Fee Related CN211174293U (en) | 2019-09-28 | 2019-09-28 | Automobile muffler fixing support |
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| Country | Link |
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| CN (1) | CN211174293U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110566329A (en) * | 2019-09-28 | 2019-12-13 | 浙江飞碟汽车制造有限公司 | Automobile muffler fixing support and characteristic calculation method thereof |
-
2019
- 2019-09-28 CN CN201921634321.1U patent/CN211174293U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110566329A (en) * | 2019-09-28 | 2019-12-13 | 浙江飞碟汽车制造有限公司 | Automobile muffler fixing support and characteristic calculation method thereof |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200804 |