TWM604827U - Exhaust device for motorcycle engine - Google Patents

Abstract

The exhaust device of the locomotive engine of this creation includes: an exhaust pipe, a catalytic converter assembly, an oxygen sensor installation pipe, an oxygen sensor, a muffler and a tail pipe. The exhaust pipe includes an inlet end and an outlet end, the inlet end is connected with the exhaust end of the engine; the catalytic converter assembly includes a catalytic converter front cover, a catalytic converter cylinder and at least one accommodating device For the catalytic converter in the cylinder of the catalytic converter, the front cover of the catalytic converter is connected with the outlet end. The oxygen sensor installation pipe is connected to the cylinder of the catalytic converter, and has a supporting member and a lock attachment seat connected; the oxygen sensor is locked and installed on the lock attachment seat; the muffler includes a catalytic converter The front cover of the muffler connected to the front cover and a muffler body, at least a part of the catalytic converter cylinder and the oxygen sensor installation pipe system are housed in the muffler; the tail pipe is inserted through the muffler body; the oxygen sensor body The ventilation cross-sectional area of the oxygen sensor installation pipe at the installation position is smaller than the ventilation cross-sectional area of the at least one catalytic converter. In this way, the measurement sensitivity of the oxygen sensor can be increased.

Description

Exhaust device of locomotive engine

This creation is about an engine exhaust device, especially an exhaust device suitable for locomotive engines.

At present, the catalytic converter installed in the exhaust device of the four-stroke engine is coated with a catalyst on a metal cylinder. The catalytic converter contains platinum (Pt) and palladium (Pd) and other precious metals. Precious metals can oxidize the air pollutants produced by incomplete combustion of the engine, such as carbon monoxide (CO) and hydrocarbons (HC) in exhaust gas, into harmless carbon dioxide (CO2) and water (H2O). The nitrogen oxide compound (NOX) is reduced to harmless nitrogen (N2) and oxygen (O2) through the noble metal rhodium (Rh) contained in the catalyst to purify the air pollutants in the engine exhaust.

In addition, the main purpose of the oxygen sensor (Oxygen Sensor or O2 Sensor) is to control the "air-fuel ratio" of gasoline and oxygen in the engine. The oxygen sensor will automatically detect the oxygen in the exhaust pipe. The content information is sent back to the electronic control unit (ECU: Electronic Control Unit) of the locomotive. More oxygen content means that the air-fuel ratio is too lean, and less oxygen content means that the air-fuel ratio is too rich. If the air-fuel ratio is too lean, the electronic control unit will drive fuel injection Inject more oil into the nozzle to enrich the oil and gas. If the air-fuel ratio is too rich, the electronic control unit will control the injector to make it inject less fuel, so that it can be adjusted quickly under the rapid operation and control of the electronic control unit Find the most appropriate air-fuel ratio, so that every drop of oil can play the best efficiency and achieve fuel saving effect. Therefore, the oxygen sensor can be used to determine whether the exhaust gas in the exhaust pipe is too rich or too lean.

At present, there must be an upstream oxygen sensor inside the fuel injection engine of the locomotive on the market, which is installed upstream of the catalytic converter to detect the exhaust gas oxygen content and feed it back to the electronic control unit. The ECU controls the fuel injection nozzle to inject fuel. To control the engine air-fuel ratio to maintain the most suitable mixing ratio in each operating state. However, as pollution regulations become more and more stringent, the traditional upstream oxygen sensor cannot monitor the degradation degree of the catalytic converter. Therefore, a downstream oxygen sensor must be added behind the catalytic converter to detect the deterioration of the catalytic converter. Degree of degradation.

Conventional technologies such as the Taiwan M587688 patent reveal that the front cover of the catalytic converter covers the exhaust pipe body, which reduces the volume of the exhaust pipe body and makes the overall design and layout difficult. In addition, the Taiwan patent I672434 discloses that the ventilation cross-sectional area of the oxygen sensor support tube is larger than the ventilation cross-sectional area of the catalytic converter, which will reduce the sensitivity of the oxygen sensor to sense exhaust gas, and it is difficult to read the correct mixing ratio. Cause ECU misjudgment. In addition, the Taiwan M587213 patent discloses that the front cover of the muffler is connected to the outer cylinder of the catalytic converter, and the reasonable installation position of the oxygen sensor is before the front cover of the muffler, which will cause the volume of the muffler to decrease. In summary, the above-mentioned conventional technologies have the disadvantages that it is difficult to read the correct mixing ratio or the volume of the muffler is small, which is not very ideal, and there is still room for improvement.

This is the reason for the creation. Based on the spirit of active invention and creation, he eagerly thought of a "exhaust device for locomotive engine" that could solve the above problems. After several research experiments, he finally completed the creation.

In order to solve the aforementioned problems, the design of this creation makes the ventilation cross-sectional area of the oxygen sensor installation tube smaller than the ventilation cross-sectional area of the catalytic converter, which can increase the measurement sensitivity of the oxygen sensor. In addition, if the muffler covers at least a part of the catalytic converter cylinder and the oxygen sensor installation pipe, but does not include the front cover of the catalytic converter, the overall volume of the muffler can be increased.

To achieve the above purpose, the exhaust device of the locomotive engine of this creation includes: an exhaust pipe, a catalytic converter assembly, an oxygen sensor installation pipe, an oxygen sensor, a muffler, and One tail pipe. Wherein, the exhaust pipe includes an inlet end and an outlet end, the inlet end is connected with an exhaust end of an engine; the catalytic converter assembly includes a catalytic converter front cover, and a catalytic converter A catalytic converter cylinder connected to the front cover and at least one catalytic converter accommodated in the catalytic converter cylinder. The front cover of the catalytic converter communicates with the outlet end.

In addition, the oxygen sensor installation pipe is connected to the cylinder of the catalytic converter, and the oxygen sensor installation pipe includes a supporting member and a lock attachment seat connected; the oxygen sensor is locked and installed on the lock attachment seat The muffler includes a muffler front cover connected to the front cover of the catalytic converter and a muffler body, at least a part of the catalytic converter cylinder and the oxygen sensor installation pipe are accommodated in the muffler ; The tail pipe penetrates the muffler body, the tail pipe is used to guide the exhaust gas in the muffler to the outside. In addition, the ventilation cross-sectional area of the oxygen sensor installation pipe at the oxygen sensor installation position is smaller than the ventilation cross-sectional area of the at least one catalytic converter, thereby increasing the measurement sensitivity of the oxygen sensor.

The locking seat of the above-mentioned oxygen sensor installation pipe can be recessed in the oxygen sensor installation pipe, so that when the inner diameter of the oxygen sensor installation pipe and the catalytic converter are the same, the oxygen sensor installation pipe The ventilation cross-sectional area is still smaller than the ventilation cross-sectional area of the catalytic converter.

The above-mentioned at least one catalytic converter may be a two-catalyst converter, and the oxygen-containing sensor installation tube may be located between the two catalytic converters or behind the two catalytic converters. When the oxygen-containing sensor installation pipe is located behind the two catalytic converters, the inner diameters of the oxygen-containing sensor installation pipe and the catalytic converter can be the same or different.

The supporting member of the above-mentioned oxygen sensor installation pipe can be fixed on the muffler body, which can adopt welding combination or other equivalent fixing methods.

The above-mentioned oxygen sensor installation pipe and the catalytic converter cylinder can be a molded one-piece structure, or a two-piece structure, and then welded and combined to form an integrated structure.

The above-mentioned oxygen sensor installation pipe can be sleeved and fixed on the cylinder of the catalyst converter to form an integrated structure. In addition, the front cover of the catalytic converter and the front cover of the muffler can be welded together or other equivalent fixing methods.

The above summary and the following detailed description are exemplary in nature to further illustrate the scope of patent application of the present invention. The other objectives and advantages of the present invention will be explained in the following description and illustrations.

Please refer to FIG. 1, FIG. 2 and FIG. 3, which are respectively a schematic diagram of a plan structure, a schematic diagram of a three-dimensional structure, and a schematic diagram of a cross-sectional structure of a muffler of the first preferred embodiment of the creation of the locomotive engine exhaust device. The exhaust device of the locomotive engine of this embodiment includes: an exhaust pipe 25, a catalytic converter assembly 30, an oxygen sensor installation pipe 35, an oxygen sensor 36, a muffler 40 and a Tailpipe 41. The exhaust pipe 25 includes an inlet end 251 and an outlet end 252. The inlet end 251 is connected with an exhaust end 201 of an engine 20. In this embodiment, an upstream oxygen sensor 26 is fixed on the exhaust pipe 25 to detect changes in the oxygen content of the exhaust of the engine 20.

In addition, the catalytic converter assembly 30 includes a catalytic converter front cover 31, a catalytic converter cylinder 32 connected to the catalytic converter front cover 31, and two accommodating in the catalytic converter cylinder The first catalytic converter 33 and the second catalytic converter 34 in the body 32, and the front cover 31 of the catalytic converter communicates with the outlet end 252 of the exhaust pipe 25. The oxygen sensor installation pipe 35 is in communication with the catalyst converter cylinder 32, and the oxygen sensor installation pipe 35 includes a supporting member 351 and a locking seat 352 connected to each other. In addition, the oxygen sensor 36 is locked and installed on the locking seat 352.

The muffler 40 includes a muffler front cover 401 connected to the catalytic converter front cover 31 and a muffler body 402. The catalytic converter cylinder 32 and the oxygen sensor mounting pipe 35 are accommodated in the muffler器40 Within. In addition, a tail pipe 41 penetrates the muffler body 402 to guide the exhaust gas in the muffler 40 to be discharged to the outside.

In this embodiment, as shown in FIG. 5, the supporting member 351 of the oxygen sensor mounting pipe 35 is welded and fixed to the muffler body 402, and the locking seat 352 of the oxygen sensor mounting pipe 35 is welded W is fixed on the installation pipe 35 of the oxygen sensor. In addition, the front cover 31 of the catalytic converter and the front cover 401 of the muffler are also welded together. The oxygen sensor installation pipe 35 is welded and fixed to the catalytic converter cylinder 32. The oxygen sensor installation pipe 35 and the catalyst The converter cylinder 32 can also be fixed in a sleeve, or can be a one-piece structure by molding.

Please refer to FIG. 4A, FIG. 4B and FIG. 5, which are respectively a schematic cross-sectional structure diagram of the oxygen sensor installation pipe and a catalytic converter of the locomotive engine exhaust device of the first preferred embodiment and a schematic diagram of the muffler plane structure. In this embodiment, as shown in FIG. 5, the first catalytic converter 33, the second catalytic converter 34 and the oxygen sensor installation pipe 35 have the same inner diameter size, and the oxygen sensor installation pipe 35 is located at the first Between a catalytic converter 33 and a second catalytic converter 34. In addition, as shown in FIGS. 4A and 4B, the locking seat 352 is recessed in the oxygen sensor installation pipe 35, so the ventilation cross-sectional area A1 of the oxygen sensor installation pipe 35 at the installation position of the oxygen sensor 36 It is smaller than the air cross-sectional area A2 of the first catalytic converter 33.

Therefore, in this embodiment, since the ventilation cross-sectional area A1 of the oxygen sensor installation pipe 35 is smaller than the ventilation cross-sectional area A2 of the first catalytic converter 33, the measurement sensitivity of the oxygen sensor 36 can be increased. In addition, the muffler 40 of this embodiment covers the catalytic converter cylinder 32 and the oxygen-containing sensor installation pipe 35, but does not include the catalytic converter front cover 31, which can increase the overall volume of the muffler 40.

Please refer to Figures 6 and 7, which are respectively a schematic side view and a schematic top view of the installation position of the oxygen sensor of the locomotive engine exhaust device according to the first preferred embodiment of the creation. Viewed from the right side, the oxygen sensor 36 on the muffler 40 of this embodiment is located in the first quadrant of the rear wheel 70.

Please refer to FIG. 8 which is a schematic diagram of the plan structure of the muffler of the locomotive engine exhaust device of the second preferred embodiment of this creation. The structure of this embodiment is roughly the same as that of the first embodiment, and the difference is only the oxygen content of the first embodiment. The sensor installation pipe 35 is located between the first catalytic converter 33 and the second catalytic converter 34, and the oxygen sensor installation pipe 45 of this embodiment is located between the first catalytic converter 33 and the second catalytic converter 33. After the media converter 34, the rest of the structure is exactly the same.

The structure of this embodiment is also the same as the first embodiment. The muffler 50 of this embodiment includes a muffler front cover 501 connected to the front cover 31 of the catalytic converter, a muffler body 502, and a cylinder body 321 of the catalytic converter. And the oxygen sensor installation pipe 45 is accommodated in the muffler 50, and the oxygen sensor installation pipe 45 includes a supporting member 451 and a locking seat 452 connected to each other. In addition, the tail pipe 51 penetrates the muffler body 502 to guide the exhaust gas in the muffler 50 to the outside. Therefore, this embodiment is also the same as the first embodiment, which can increase the measurement sensitivity of the oxygen sensor 36 and also increase the volume of the silencer 50 as a whole.

Please refer to FIG. 9 which is a schematic diagram of the plan structure of the muffler of the locomotive engine exhaust device of the third preferred embodiment of this creation. The structure of this embodiment is roughly the same as that of the second embodiment, and the difference lies only in the first of the second embodiment. The inner diameter of the catalytic converter 33, the second catalytic converter 34 and the oxygen sensor installation pipe 45 are the same, and the first catalytic converter 33, the second catalytic converter 34 and the oxygen sensor of this embodiment The inner diameter of the installation tube 55 is different, and the rest of the structure is exactly the same.

The structure of this embodiment is also the same as that of the second embodiment. The muffler 60 of this embodiment includes a muffler front cover 601 connected to the front cover 31 of the catalytic converter, a muffler body 602, and a cylinder 322 of the catalytic converter. And the oxygen sensor installation pipe 55 is accommodated in the muffler 60. The oxygen sensor installation pipe 55 includes a supporting member 551 and a locking seat 552 connected to each other. In addition, a tail pipe 61 penetrates the muffler body 602 to guide the exhaust gas in the muffler 60 to the outside. Therefore, this embodiment is also the same as the second embodiment, which can increase the measurement sensitivity of the oxygen sensor 36 and also increase the volume of the silencer 60 as a whole.

Please refer to FIG. 10 which is a schematic diagram of the plan structure of the muffler of the locomotive engine exhaust device of the fourth preferred embodiment of this creation. The structure of this embodiment is roughly the same as that of the first embodiment, and the difference is only in the first embodiment of the first embodiment. The catalytic converter cylinder 32 and the oxygen sensor installation pipe 35 are both contained in the muffler 40, and in this embodiment, only part of the catalytic converter cylinder 32 and the oxygen sensor installation pipe 65 are contained in the silencer. Inside the muffler 80, the rest of the structure is exactly the same.

The structure of this embodiment is also the same as that of the first embodiment. The muffler 80 of this embodiment includes a muffler front cover 801 connected to the front cover 31 of the catalytic converter, and a muffler body 802. Part of the catalytic converter cylinder 32 and the oxygen sensor installation pipe 65 are accommodated in the muffler 80, that is, part of the first catalytic converter 33 is installed outside the muffler front cover 801, and the second catalytic converter 34 is connected to the oxygen The sensor installation pipe 65 is contained in the muffler 80, and the oxygen sensor installation pipe 65 includes a supporting member 651 and a locking seat 652 connected to each other. In addition, the tail pipe 71 penetrates the muffler body 802 to guide the exhaust gas in the muffler 80 to the outside. Therefore, this embodiment is also the same as the second embodiment, which can increase the measurement sensitivity of the oxygen sensor 36 and increase the volume of the silencer 80 as a whole.

The above-mentioned embodiments are merely examples for the convenience of description, and the scope of rights claimed in this creation should be subject to the scope of the patent application, not limited to the above-mentioned embodiments.

20: Engine 201: exhaust end 25: Exhaust pipe 251: entry side 252: Exit 26: Upstream oxygen sensor 30: Catalyst converter assembly 31: Front cover of catalytic converter 32,321,322: Catalytic converter cylinder 33: The first catalytic converter 34: The second catalytic converter 35, 45, 55, 65: oxygen sensor installation pipe 351,451,551,651: Support parts 352,452,552,652: Locking seat 36: oxygen sensor 40, 50, 60, 80: silencer 401,501,601,801: muffler front cover 402, 502, 602, 802: silencer body 41, 51, 61, 71: tail pipe 70: rear wheel A1, A2: ventilation cross-sectional area W: welding

Fig. 1 is a schematic diagram of a plan structure of a locomotive engine exhaust device according to the first preferred embodiment of the present invention. 2 is a schematic diagram of the three-dimensional structure of the exhaust device of the locomotive engine according to the first preferred embodiment of the invention. Fig. 3 is a schematic cross-sectional structure diagram of the muffler of the locomotive engine exhaust device of the first preferred embodiment of the invention. Fig. 4A is a cross-sectional structural diagram of the installation pipe of the oxygen sensor of the exhaust device of the locomotive engine according to the first preferred embodiment of the invention. 4B is a schematic cross-sectional structure diagram of a catalytic converter of a locomotive engine exhaust device according to the first preferred embodiment of the invention. Fig. 5 is a schematic plan view of the muffler of the locomotive engine exhaust device according to the first preferred embodiment of the invention. Fig. 6 is a schematic side view of the installation position of the oxygen sensor of the locomotive engine exhaust device according to the first preferred embodiment of the invention. Fig. 7 is a schematic top view of the installation position of the oxygen sensor of the exhaust device of the locomotive engine according to the first preferred embodiment of the invention. Fig. 8 is a schematic diagram of the plan structure of the muffler of the locomotive engine exhaust device according to the second preferred embodiment of the invention. Fig. 9 is a schematic diagram of a plan structure of a muffler of a locomotive engine exhaust device according to the third preferred embodiment of the invention. Fig. 10 is a schematic plan view of the muffler of the locomotive engine exhaust device according to the fourth preferred embodiment of the present invention

35: oxygen sensor installation pipe

351: Support

352: Lock Attachment

36: oxygen sensor

40: silencer

402: Silencer body

Claims (10)

An exhaust device for a locomotive engine, including: An exhaust pipe includes an inlet end and an outlet end, the inlet end is connected with an exhaust end of an engine; A catalytic converter assembly including a front cover of the catalytic converter, a cylinder of the catalytic converter connected with the front cover of the catalytic converter, and at least one catalytic converter contained in the cylinder of the catalytic converter A medium converter, the front cover of the catalytic converter is in communication with the outlet end; An oxygen sensor installation pipe, which is connected to the cylinder of the catalytic converter, and includes a supporting member and a lock attachment seat connected to it; An oxygen sensor, which is locked and installed on the lock seat; A muffler includes a muffler front cover connected to the front cover of the catalytic converter and a muffler body. At least a part of the catalytic converter cylinder and the oxygen sensor installation pipe are accommodated in the muffler Within; and A tail pipe penetrates the muffler body to guide the exhaust gas in the muffler to the outside; wherein, the ventilation cross-sectional area of the oxygen sensor installation pipe at the oxygen sensor installation position is smaller than the at least one touch The cross-sectional area of the media converter. For the exhaust device of locomotive engine described in item 1 of the scope of patent application, wherein the locking seat is recessed in the oxygen sensor installation pipe. For the exhaust device of locomotive engine described in item 1 of the scope of patent application, wherein the at least one catalytic converter is a two-catalytic converter, and the oxygen sensor installation pipe is located between the two catalytic converters between. The exhaust device of locomotive engine described in claim 1 of the patent application, wherein the at least one catalytic converter is a two-catalyst converter, and the oxygen sensor installation pipe is located behind the two-catalyst converter , The inner diameter of the oxygen sensor installation pipe is the same as the catalyst converter. The exhaust device of locomotive engine described in claim 1 of the patent application, wherein the at least one catalytic converter is a two-catalyst converter, and the oxygen sensor installation pipe is located behind the two-catalyst converter , The inner diameter of the oxygen sensor installation tube and the catalytic converter are different. According to the locomotive engine exhaust device described in item 1 of the scope of patent application, wherein the supporting member of the oxygen sensor installation pipe is fixedly fixed to the muffler body. The exhaust device of the locomotive engine described in the first item of the scope of patent application, wherein the oxygen sensor installation pipe and the catalytic converter cylinder system have an integrated structure. The locomotive engine exhaust device described in the first item of the scope of patent application, wherein the oxygen sensor installation pipe is welded to the catalytic converter cylinder system. The exhaust device of locomotive engine described in item 1 of the scope of patent application, wherein the oxygen sensor installation pipe is sleeved and fixed on the catalytic converter cylinder. The exhaust device of locomotive engine described in item 1 of the scope of patent application, wherein the front cover of the catalytic converter and the front cover of the muffler are welded together.

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