CN214787627U

CN214787627U - Exhaust device of motorcycle engine

Info

Publication number: CN214787627U
Application number: CN202120377781.1U
Authority: CN
Inventors: 施廷卫; 叶哲宏
Original assignee: Sanyang Industry Co Ltd
Current assignee: Sanyang Industry Co Ltd
Priority date: 2021-02-18
Filing date: 2021-02-18
Publication date: 2021-11-19
Anticipated expiration: 2031-02-18

Abstract

The exhaust device of the motorcycle engine of the utility model comprises an exhaust front pipe, a connecting pipe, an upstream oxygen-containing sensor, a catalyst converter assembly, a downstream oxygen-containing sensor and a silencer. The exhaust front pipe is provided with an inlet end and an outlet end, and the inlet end is communicated with an exhaust end of an engine; the front end of the connecting pipe is communicated with the outlet end of the exhaust front pipe, and the upstream oxygen-containing sensor is arranged on the connecting pipe; the catalyst converter assembly is provided with a catalyst converter cylinder and a first catalyst converter arranged in the catalyst converter cylinder, and the front end of the catalyst converter assembly is communicated with the rear end of the connecting pipe; the downstream oxygen-containing sensor group is arranged on the catalytic converter assembly and is positioned behind the first catalytic converter; the silencer has a silencer front cover connected with the catalytic converter cylinder and a silencer body.

Description

Exhaust device of motorcycle engine

Technical Field

The present invention relates to an exhaust device for an engine, and more particularly to an exhaust device for an engine of a motorcycle.

Background

The catalytic converter disposed in the exhaust device of the four-stroke engine at present coats a catalyst on a metal cylinder, the catalyst contains precious metals such as platinum (Pt) and palladium (Pd), the precious metals can oxidize the air pollutants generated by incomplete combustion of the engine, such as carbon monoxide (CO) and Hydrocarbon (HC) in the exhaust gas, into harmless carbon dioxide (CO2) and water (H2O), and the Nitrogen Oxide (NOX) in the exhaust gas is reduced into harmless nitrogen (N2) and oxygen (O2) through the precious metal rhodium (Rh) contained in the catalyst, so as to purify the air pollutants in the exhaust gas of the engine.

In addition, the main purpose of the Oxygen Sensor (Oxygen Sensor or O2 Sensor for short) is to Control the air-fuel ratio of gasoline and Oxygen in the Engine, the Oxygen Sensor will automatically transmit the information of the Oxygen content in the exhaust gas detected in the exhaust pipe back to the Engine Control Unit (ECU), the Oxygen content is more than that indicating that the air-fuel ratio is too lean and the Oxygen content is less than that indicating that the air-fuel ratio is too rich, if the air-fuel ratio is too lean, the Engine Control Unit will drive the oil nozzle to spray more oil to enrich the oil-gas, if the air-fuel ratio is too rich, the Engine Control Unit will Control the oil nozzle to spray less oil, so that under the Control of the Engine Control Unit's fast operation, the most appropriate air-fuel ratio can be adjusted quickly, and each drop of oil will have the best efficiency, so as to achieve the fuel saving effect. Therefore, the oxygen sensor may be used to determine whether the exhaust gas in the exhaust pipe is in an over-rich or over-lean condition.

An oxygen sensor is arranged in the injection oil supply engine of the motorcycle on the market at present, and is arranged on an exhaust front pipe at the upstream of a catalytic converter for detecting the oxygen content of exhaust and feeding back to an engine control unit, and an ECU controls the air-fuel ratio of the engine by controlling the oil injection quantity of an oil injection nozzle so as to maintain the most suitable mixing ratio under each operation state.

Fig. 1 is a schematic view of an exhaust system of a conventional motorcycle engine, which includes: an exhaust head pipe 75, a connecting pipe 76, a catalytic converter assembly 80, a muffler 90 and a tail pipe 93 connected in sequence. The exhaust front pipe 75 includes an inlet port 751 and an outlet port 752, and the inlet port 751 is communicated with an exhaust port 701 of an engine 70. The front end of the connecting pipe 76 is connected to the outlet 752 of the front exhaust pipe 75, and an oxygen sensor 77 is disposed on the front exhaust pipe 75 for detecting the change of the oxygen content of the exhaust gas in the front exhaust pipe 75.

As shown in fig. 1, the catalytic converter assembly 80 includes a catalytic converter cylinder 81, a connecting member 83, and a first catalytic converter 82 and a second catalytic converter 84 disposed in the catalytic converter cylinder 81, the first catalytic converter 82 and the second catalytic converter 84 are connected by the connecting member 83, and the front end of the catalytic converter cylinder 81 is communicated with the rear end of the connecting pipe 76. The muffler 90 includes a muffler front cover 901 connected to the catalytic converter cylinder 81 and a muffler body 902, and the tail pipe 93 is disposed through the muffler body 902 for guiding the exhaust gas in the muffler 90 to the outside. In addition, a cone 91 and a rectifying pipe 92 are sequentially connected to each other in the muffler body 902, and the cone 91 is communicated with the rear end of the catalytic converter assembly 90.

However, as the pollution regulations become more stringent, the exhaust device of the motorcycle engine, which is provided with the oxygen sensor 77 only on the exhaust pipe 75, cannot monitor the deterioration degree of the first catalytic converter 82 downstream of the exhaust pipe 75, and is not ideal, and there is room for improvement.

The inventor is therefore in view of the above, and in view of the spirit of the active invention, a motorcycle engine exhaust device capable of solving the above problems is urgently needed, and the present invention is completed after several research experiments.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems, and in response to increasingly stringent pollution regulations and laws, the regulations must be detected for the deterioration degree of the catalytic converter, the utility model discloses add a downstream oxygen-containing sensor behind the catalytic converter to detect the deterioration degree of the catalytic converter, can know at any time whether the catalytic converter needs to be changed, in order to accord with the regulations of environmental protection emission regulations.

To achieve the above object, the present invention provides an exhaust device for a motorcycle engine, comprising an exhaust head pipe, a connecting pipe, an upstream oxygen sensor, a catalytic converter assembly, a downstream oxygen sensor, and a muffler. The exhaust front pipe is provided with an inlet end and an outlet end, and the inlet end is communicated with an exhaust end of an engine; the front end of the connecting pipe is communicated with the outlet end of the exhaust front pipe, and the upstream oxygen-containing sensor is arranged on the connecting pipe; the catalyst converter assembly is provided with a catalyst converter cylinder and a first catalyst converter arranged in the catalyst converter cylinder, and the front end of the catalyst converter assembly is communicated with the rear end of the connecting pipe; the downstream oxygen-containing sensor is arranged on the catalytic converter assembly and positioned at the downstream of the first catalytic converter; the silencer has a silencer front cover connected with the catalytic converter cylinder and a silencer body.

The catalyst converter cylinder is further provided with a second catalyst converter which is positioned at the downstream of the downstream oxygen-containing sensor and has the function of purifying the exhaust emission.

The outlet end of the exhaust front pipe and the front end of the connecting pipe can adopt a welding combination or other equivalent fixing modes.

The outlet end of the exhaust front pipe and the front end of the connecting pipe can be combined through a combiner, and therefore the exhaust front pipe and the connecting pipe can be conveniently disassembled and combined.

The upstream oxygen sensor and the first catalytic converter may be disposed adjacently, and the downstream oxygen sensor and the first catalytic converter may also be disposed adjacently, that is, the upstream oxygen sensor and the downstream oxygen sensor are disposed respectively in front of and behind the first catalytic converter.

The catalytic converter cylinder and the front cover of the silencer can be welded or fixed in other equivalent ways.

Both the foregoing general description and the following detailed description are exemplary and explanatory in nature to further illustrate the scope of the present invention as claimed. Other objects and advantages of the present invention will become apparent from the following description and drawings.

Drawings

Fig. 1 is a schematic configuration diagram of an exhaust device of a conventional motorcycle engine.

Fig. 2 is a schematic view showing the arrangement of an exhaust device of an engine of a motorcycle according to a first preferred embodiment of the present invention.

Fig. 3 is a schematic view showing the arrangement of an exhaust device of an engine of a motorcycle according to a second preferred embodiment of the present invention.

Description of the main element symbols:

20,70 Engine 201,701 exhaust

Inlet end of 25,75 exhaust front pipe 251,751

252,752 Outlet ends 26,76 connecting pipe

27 upstream oxygen sensor 28 combiner

30,80 catalytic converter assembly 31,81 catalytic converter cylinder

32,82 first catalytic converter 33,83 connecting piece

34,84 second catalytic converter 37 downstream oxygen sensor

40,90 silencer 401,901 silencer bezel

402,902 taper pipe for

silencer body

41,91

42,92 rectifier 43,93 tail pipe

77 oxygen sensor

Detailed Description

Fig. 2 is a schematic configuration diagram of an exhaust device of a motorcycle engine according to a first preferred embodiment of the present invention, the exhaust device of the motorcycle engine of the present embodiment includes: an exhaust head pipe 25, a connecting pipe 26, an upstream oxygen sensor 27, a catalytic converter assembly 30, a downstream oxygen sensor 37, a muffler 40 and a tail pipe 43. The exhaust front pipe 25 includes an inlet end 251 and an outlet end 252, and the inlet end 251 is communicated with an exhaust end 201 of an engine 20. The front end of the connecting pipe 26 is connected to the outlet end 252 of the front exhaust pipe 25, and the upstream oxygen sensor 27 is disposed on the connecting pipe 26 to detect the change of the oxygen content of the exhaust gas in the connecting pipe 26.

As shown in fig. 2, the catalytic converter assembly 30 includes a catalytic converter cylinder 31, a connecting member 33, and a first catalytic converter 32 and a second catalytic converter 34 disposed in the catalytic converter cylinder 31, wherein the front end of the catalytic converter cylinder 31 is communicated with the rear end of the connecting pipe 26. Downstream oxygen sensor 37 is disposed on connecting member 33 of catalytic converter assembly 30 and downstream of first catalytic converter 32. The muffler 40 includes a muffler front cover 401 connected to the catalytic converter cylinder 31 and a muffler body 402, and the tail pipe 43 is inserted into the muffler body 402 to guide the exhaust gas in the muffler 40 to the outside.

In this embodiment, a cone 41 and a rectifying tube 42 are sequentially connected to each other in the muffler body 402, and the cone 41 is in communication with the catalytic converter assembly 30. In addition, the upstream oxygen sensor 27 and the downstream oxygen sensor 37 are disposed adjacent to each other in front of and behind the first catalytic converter 32, respectively, and the second catalytic converter 34 is disposed downstream of the downstream oxygen sensor 37. The catalytic converter cylinder 31 is welded to the muffler front cover 401, and the outlet end 252 of the exhaust front pipe 25 is also welded to the front end of the connection pipe 26.

Fig. 3 is a schematic configuration diagram of an exhaust device of a motorcycle engine according to a second preferred embodiment of the present invention, and this embodiment is substantially the same as the first embodiment, except that the outlet end 252 of the exhaust front pipe 25 of this embodiment is combined with the front end of the connecting pipe 26 through a coupler 28, and the outlet end 252 of the exhaust front pipe 25 of the first embodiment is welded with the front end of the connecting pipe 26. The outlet end 252 of the exhaust front pipe 25 and the front end of the connecting pipe 26 are coupled by the coupling 28, so that the exhaust front pipe 25, the connecting pipe 26, the catalytic converter assembly 30 at the rear end thereof, and the muffler 40 can be easily detached.

Both of the above embodiments can detect the purification function of the exhaust gas discharged from the rear of the first catalytic converter 32, and relatively know the deterioration degree of the first catalytic converter 32, and further know whether the first catalytic converter 32 and the second catalytic converter 34 need to be replaced, so as to meet the regulations of the environmental emission regulations.

The above-described embodiments are merely exemplary for convenience of description, and the scope of the claims of the present invention should not be limited to the above-described embodiments.

Claims

1. An exhaust device for a motorcycle engine, comprising:

the exhaust front pipe comprises an inlet end and an outlet end, and the inlet end is communicated with an exhaust end of an engine;

a connecting pipe, the front end of which is communicated with the outlet end;

an upstream oxygen sensor, which is arranged on the connecting pipe;

a catalyst converter assembly, including a catalyst converter cylinder and a first catalyst converter arranged in the catalyst converter cylinder, the front end of the catalyst converter assembly is communicated with the rear end of the connecting pipe;

a downstream oxygen sensor mounted on the catalytic converter assembly and located downstream of the first catalytic converter; and

a silencer comprises a silencer front cover connected with the catalytic converter cylinder and a silencer body.

2. An exhaust system for a motorcycle engine as claimed in claim 1, wherein the catalytic converter cylinder is further provided with a second catalytic converter disposed downstream of the downstream oxygen sensor.

3. An exhaust apparatus for a motorcycle engine as claimed in claim 1, wherein the outlet end of the exhaust front pipe is welded to a front end of the connecting pipe.

4. An exhaust apparatus for a motorcycle engine as claimed in claim 1, wherein the outlet end of the exhaust front pipe and the front end of the connecting pipe are combined by a coupling.

5. An exhaust system for a motorcycle engine as claimed in claim 1, wherein the upstream oxygen sensor is disposed adjacent to the first catalytic converter.

6. An exhaust system for a motorcycle engine as claimed in claim 1, wherein the downstream oxygen sensor is disposed adjacent to the first catalytic converter.

7. An exhaust apparatus for motorcycle engine as claimed in claim 1, wherein the catalytic converter cylinder is welded to the muffler front cover.