AU2013101713A4

AU2013101713A4 - Exhaust gas Recycling Device Of Internal Combustion Engines

Info

Publication number: AU2013101713A4
Application number: AU2013101713A
Authority: AU
Inventors: Gang Chen; Zhenpei CHEN; Yuxia LI; Tiejian LIN; Daolong QIU; Huailin SU; Wen Tan; Zemin TAO; Dingyong WU; Huidong WU; Chunqiong XIE; Shuangchao YE; Jinhai Yu
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2013-07-04
Filing date: 2013-11-29
Publication date: 2015-02-12
Anticipated expiration: 2021-11-29
Also published as: AU2014274633A1; WO2015000253A1; DE112013007209T5; CN103397934A

Abstract

- 15 Abstract An exhaust gas recycling device of the internal combustion engine is provided. The exhaust gas recycling device comprises a power turbine fixedly connected with an exhaust pipe of the internal combustion engine through a power turbine 5 inlet pipe; and a reduction gear set engaged with an output gear of the power turbine. The reduction gear set includes at least one pair of mutually engaged gears; and power output parts of the reduction gear set is connected with a crankshaft or a flywheel of the internal combustion wheel in a coaxial way. According to the present invention, the exhaust gas goes through secondary 10 circulation, and the exhaust gas energy is effectively utilized, thereby improving the power of the internal combustion engine. 10 -_ _

Description

- 1 Exhaust gas Recycling Device Of Internal Combustion Engines Technical Field 5 The present invention relates to the field of internal combustion engines, in particular to an exhaust gas recycling device for internal combustion engines. Description of the Related Art 10 Internal combustion engines are machines that convert the chemical energy of fuel into mechanical energy. They are widely applied in transportation, agricultural and industrial fields. However, when consuming a great amount of fuel resources, the internal combustion engine discharges a great amount of exhaust gas. Nowadays, the energy for power output of the internal 15 combustion engine only accounts for 35%-45% of the total heat generated by the combustion of the fuel (diesel engine) or 20%-30% (gasoline engine). The energy emitted outside by the internal combustion engine mainly includes the heat taken away by the circulating cooled water and by the exhaust gas, the latter accounting for 30%-40% (diesel engine) or 40% 20 ~50% (gasoline engine). When the exhaust gas is exhausted from the exhaust main pipe from the booster pump outlet, the temperature is 500'C 700'C, and the pressure is 0.4MPa to 0.5MPa. At present, the exhaust gas of the internal combustion engine is directly discharged into the air from the exhaust pipe outlet or the turbine outlet of the booster, causing a waste of 25 energy and polluting the environment. Summary of the Present Invention The objective of the present invention is to overcome the defects in the prior -2 art by providing an exhaust gas recycling device of the internal combustion engine, which can recycle the energy consumption to realize energy-saving and emission-reduction. To this end, the present invention provides an exhaust gas recycling device of 5 the internal combustion engine, which comprises: a power turbine fixedly connected with an exhaust pipe of the internal combustion engine through a power turbine inlet pipe; and a reduction gear set engaged with an output gear of the power turbine. The reduction gear set includes at least one pair of mutually engaged gears; and power output parts of the reduction gear set is connected 10 with a crankshaft or a flywheel of the internal combustion wheel in a coaxial way. In a preferred embodiment of the present invention, the exhaust gas recycling device of the internal combustion engine further comprises a booster that is disposed between the exhaust pipe of the internal combustion engine and the 15 power turbine inlet pipe. The exhaust pipe is fixedly connected to a turbine inlet of the booster through a booster inlet pipe; and a turbine outlet of the booster is fixedly connected with the power turbine inlet pipe. In a preferred embodiment of the present invention, the exhaust gas recycling device of the internal combustion engine further comprises a hydraulic coupling 20 that is disposed between the power turbine and the reduction gear set. The hydraulic coupling comprises an input gear that is engaged with the output gear of the power turbine; and a power output end that is coaxially connected with the reduction gear set. In a preferred embodiment of the present invention, the exhaust gas recycling 25 device of the internal combustion engine further comprises an overrun clutch that is disposed between the power output part of the reduction gear set and the crankshaft. The overrun clutch includes a power input part connected to the power output part of the reduction gear set, and an output end coaxially connected with the crankshaft or fly wheel of the internal combustion engine.

- 3 In a preferred embodiment of the present invention, the input gear of the hydraulic coupling is sleeved on the outer circumference of the input end of the hydraulic coupling. In a preferred embodiment of the present invention, the power output part of the 5 reduction gear set and the power input part of the overrun clutch are driven by a gear wheel, a chain wheel or a tooth-shaped synchronous belt. In a preferred embodiment of the present invention, the power input part of the overrun clutch is sleeved on the outer circumference of the input end of the overrun clutch. 10 In a preferred embodiment of the present invention, the exhaust gas recycling device of the internal combustion engine further comprises a first protective cover that is disposed outside the hydraulic coupling and the reduction gear set, and the first protective cover is fixedly connected with a casing of the power turbine. 15 In a preferred embodiment of the present invention, the exhaust gas recycling device of the internal combustion engine further comprises a second protective cover that is disposed outside the hydraulic coupling and the reduction gear set, and the second protective cover is fixedly connected with the casing of the power turbine. 20 Compared with the conventional exhaust gas recycling device, the exhaust gas recycling device of the internal combustion engine according to the present invention has the following beneficial effects: 1) The exhaust gas goes through secondary circulation, and the exhaust gas energy is effectively utilized, thereby improving the power of the internal 25 combustion engine. 2) The cycling of the exhaust gas reduces the emission of the harmful gases in the exhaust gas, thus reducing noise and pollution. The embodiment of the present invention is described in further detail below -4 with reference to the attached drawings and embodiments. Description of the Accompanying Drawings The attached drawings help you further understand the present invention, 5 constitute a part of the description, and are used to explain the present invention together with the embodiments of the present invention, but shall not be regarded as limitations on the present invention. In the attached drawings: Figure 1 is a schematic view of the exhaust gas recycling device of the 10 internal combustion engine according to the present invention. Figure 2 is a first perspective view of the exhaust gas recycling device of the internal combustion engine according to the present invention. Figure 3 is a second perspective view of the exhaust gas recycling device of the internal combustion engine according to the present invention. 15 Figure 4 is a third perspective view of the exhaust gas recycling device of the internal combustion engine according to the present invention. Figure 5 is a fourth perspective view of the exhaust gas recycling device of the internal combustion engine according to the present invention. Figure 6 is a front view of the structure of a hydraulic coupling of the 20 exhaust gas recycling device of the internal combustion engine according to the present invention. Figure 7 is a lateral view showing the lateral structure of the hydraulic coupling of the exhaust gas recycling device of the internal combustion engine according to the present invention. 25 Description of the numbers in the drawings: 1-Exhaust pipe; -5 2-Booster inlet pipe; 3-Booster; 4-Power turbine inlet pipe; 5-Power turbine; 5 6-Power turbine inlet pipe; 7-Input gear of the hydraulic coupling; 8-Hydraulic coupling; 9-Reduction gear set; 10-Power output part of the reduction gear set; 10 11-Power input part of the overrun clutch; 12-Input end of the overrun clutch; 13- Overrun clutch; 14-Output end of the overrun clutch; 15-Crankshaft; 15 16-Fly wheel 30-Internal combustion engine; 41-First protective cover; 42-Second protective cover 20 Detailed Description of the Present Invention The preferred embodiment of the present invention is now described with reference to drawings. It should be noted that the preferred embodiment is used to describe and explain the present invention instead of limiting the present invention. 25 The exhaust gas recycling device of the internal combustion engine of the -6 present invention has a compact structure. The power turbine of the exhaust gas recycling device of the internal combustion engine is pushed to rotate through the exhaust gas discharged from the exhaust pipe or the booster turbine of the internal combustion engine, then the torque is transmitted to a crankshaft 5 through a hydraulic coupling, a reduction gear set and a overrun clutch, so as to increase the moment of the crankshaft. The exhaust gas energy is thus more efficiently utilized, which improves the power of the internal combustion engine. In addition, the cycling of the exhaust gas reduces the emission of the harmful gases in the exhaust gas, reducing noise and pollution. 10 The exhaust gas recycling device of the internal combustion engine of the present invention is applicable to both boosting-type internal combustion engines and non-boosting type internal combustion engines. In the boosting-type internal combustion engine, a booster is provided, and the power turbine of the exhaust gas recycling device is located at the downstream of the booster turbine 15 (low-pressure side), that is to say, the booster inlet pipe is disposed between an outlet of the exhaust pipe and an inlet of the booster turbine of the internal combustion engine. The power turbine inlet pipe of the exhaust gas recycling device of the internal combustion engine is disposed between the outlet of the booster turbine and the power turbine; and the exhaust gas discharged from the 20 outlet of the booster turbine machine pushes the power turbine of the exhaust gas recycling device of the internal combustion engine to rotate, and then the torque is transmitted to the crankshaft through the hydraulic coupling, the reduction gear set and the overrun clutch to increase the moment of the crankshaft such that the exhaust gas performs a secondary circulation. The 25 non-boosting internal combustion engine has no booster. The power turbine of the exhaust gas recycling device of such internal combustion engine is directly disposed at the downstream (low-pressure side) of the power turbine, which means that the power turbine inlet pipe is disposed between the outlet of the exhaust pipe and the power turbine; the exhaust gas exhausted from the exhaust 30 pipe of the non-boosting internal combustion engine pushes the power turbine of -7 the exhaust gas recycling device of the non-boosting internal combustion engine to rotate, and then the torque is transmitted to the crankshaft through the hydraulic coupling, the reduction gear set and the overrun clutch to increase the moment of the crankshaft. 5 In the exhaust gas recycling device of the internal combustion engine of the present invention, the input gear of the hydraulic coupling is engaged with the output gear of the power turbine, and the output gear of the hydraulic coupling is in engagement transmission with the reduction gear set. The output end of the reduction gear set is rotationally connected with the input part of the overrun 10 clutch, and the output end of the overrun clutch is coaxially connected with the crankshaft or the flywheel, so as to transmit the torque to the crankshaft and increase the moment of the crankshaft, such that the exhaust gas performs the secondary circulation. In addition, the exhaust gas recycling device of the internal combustion engine of the present invention also comprises a first 15 protective cover and a second protective cover. The first protective cover covers the hydraulic coupling and the reduction gear set, and the first protective cover is fixedly connected with the casing of the power turbine. The second protective cover covers the overrun clutch, and the second protective cover is fixedly connected with the first protective cover. 20 As shown in Figures 2 and 3, the exhaust gas recycling device of the internal combustion engine comprises a power turbine 5, a hydraulic coupling 8, a reduction gear set 9 and a overrun clutch 13. The power turbine 5 converts the energy of the exhaust gas into mechanical power; the hydraulic coupling 8 transmits the rotatory power of the power turbine; the reduction gear set 9 25 further reduces the rotation speed and increases the torque; and finally the overrun clutch 13 transmits the torque to the crankshaft to increase the moment of the crankshaft and the power of the internal combustion engine when the rotation speed of the input end of the overrun clutch 13 is higher than that of the crankshaft (or flywheel) such that the exhaust gas enters the secondary 30 circulation.

- 8 The boosting internal combustion engine is now used as an example to describe the arrangement of the exhaust gas recycling device of the internal combustion engine on the internal combustion engine. On a conventional boosting internal combustion engine 30, the booster inlet pipe 5 2 is fixedly connected between the outlet of the exhaust pipe 1 and the turbine inlet of the booster 3, and the power turbine inlet pipe 4 is fixedly connected between the turbine outlet of the booster and the inlet of the power turbine 5, thus driving the exhaust gas exhausted from the turbine outlet of the booster 3 to enter the secondary circulation and guiding the exhaust gas into the inlet of the 10 power turbine 5 to push the power turbine to rotate and generate a rotating power; and the connection segment between the power turbine inlet pipe 4 and the turbine outlet of the booster 3 is a corrugated tube 41 which is easy for installation. The output gear 6 of the power turbine 5 is engaged with the input gear 7 of the 15 hydraulic coupling 8, and the input gear 7 of the hydraulic coupling 8 is sleeved on the outer ring of the input end of the hydraulic coupling 9, thus forming a whole body, as shown in Figure 6 and Figure 7. The hydraulic coupling 8 is a non-rigid coupling using liquid as the working media. It is a mechanism used to connect the power source and the working machine so as to transmit the rotary 20 power. The hydraulic coupling is a sealing mechanism which includes two annular wheel plates therein. The input gear 7 (drive wheel) is called a pump wheel, and the driven wheel is called a turbine wheel. Both the pump wheel and turbine wheel are called working wheels. In the annular casing of the working wheel, many blades are arranged in the radial direction. After the pump wheel is 25 assembled with the turbine wheel, an annular space is formed and is filled with the working oil. The pump wheel is usually driven by the internal combustion engine or the motor to rotate, driving the working oil to perform complicated centripetal motion. The oil which flows at a high speed impacts the turbine blades by the action of the Coriolis force and transmits the 30 kinetic energy to the turbine such that the turbine wheel and the pump wheel -9 rotate in the same direction. The oil flows back to the pump wheel from the blade edge of the turbine, forming a circulating loop, and its routing is like an annular spiral line connected end by end. The hydraulic coupling has a simple structure, occupies a small space, can buffer impact, isolate the torque vibration 5 caused by the high speed, protect the power turbine and prolong the service life of the power turbine. The turbine at the output end of the hydraulic coupling 8 is connected with the reduction gear set 9 consisting of two pairs of gears, and the turbine at the output end of the hydraulic coupling 8 is engaged with the input gear of the first gear 10 pair. The reduction gear set 9 performs the function of further reducing rotation speed and increasing the torque. The number of the pairs of the reduction gears in the reduction gear set 9 can be determined depending on the output power of the internal combustion engine. The overrun clutch 13 is a fundamental element which appears on the market as 15 the electromechanical products develop. It is an important element for power transmission and separation between the prime motor and the working machine or between the driving shaft and the driven shaft. It is a device with self-clutching function, using the changes in the speed or rotation direction of the driving and driven parts. Overrun clutches are classified into wedge overrun 20 clutches, rolling ball overrun clutches and racket overrun clutches. When the rotation speed of the input end of the overrun clutch 13 is higher than that of the crankshaft or the flywheel, the power input part of the overrun clutch and the output shaft of the overrun clutch rotate synchronously to transmit the torque to the crankshaft and increase the moment of the crankshaft, namely increasing the 25 power of the internal combustion engine. On the contrary, when the rotation speed of the input end of the overrun clutch 13 is lower than that of the crankshaft or flywheel, the input end and the output end of the overrun clutch 13 are separated completely, and the power transmission is interrupted; the input and the output ends do not interfere with each other, thus avoiding the 30 crankshaft or the fly wheel from consuming the power of the internal - 10 combustion engine when affected by the exhaust gas recycling device. The power output part 10 of the reduction gear set 9 is engaged with the power input part 11 of the overrun clutch through gears, and the power input part 11 of the overrun clutch is sleeved on the outer ring of the input end of the overrun 5 clutch, forming a whole body. The output end 14 of the overrun clutch 13 is fixedly connected with the flywheel 16. The rotation direction of the input part 11 of the overrun clutch and the rotation direction of the fly wheel 16 are same. When the rotation of the output part of the reduction gear set is lower than that of the fly wheel, the overrun clutch can prevent the exhaust gas recycling device 10 from generating negative effects on the torque of the crankshaft. The power output part 10 of the reduction gear set and the power input part 11 of the overrun clutch can be driven by a gear, a chain or a tooth-shaped synchronous belt. When a chain is selected, both the power output part 10 of the reduction gear set and the power input part 11 of the overrun clutch are chain wheels, and 15 a chain is bridged between the two chain wheels. When the tooth-shaped synchronous belt is selected for transmission, both the power output part 10 of the reduction gear set and the power input part 11 of the overrun clutch are tooth-shaped belt wheels, and a toothed synchronous belt is bridged between the two toothed belt wheel. With different transmission modes, the flexible 20 selections are provided for the structure of the internal combustion engine. Preferably, the exhaust gas recycling device of the present invention may not be equipped with the overrun clutch, and the power output part 10 of the reduction gear set is directly coaxially connected with the flywheel or the crankshaft. As shown in Figures 4 and 5, the exhaust gas recycling device of the internal 25 combustion engine of the present invention also comprises a first protective cover and a second protective cover. The first protective cover 41 covers the hydraulic coupling 8 and the reduction gear set 9. The dimensions of the first protective cover 41 match the outer edge of the hydraulic coupling 8 and the reduction gear set 9, and the first protective cover 41 is fixedly connected with 30 the power turbine 5. The second protective cover 42 covers the overrun clutch - 11 13. The dimensions of the second protective cover match with the outer edge of the overrun clutch 13; and the second protective over is fixedly connected with the first protective cover. As shown in Figure 1, the booster inlet pipe 2 connects the exhaust pipe 1 and 5 the booster 3 such that the exhaust gas energy can enter the engine system and can be recycled. After passing through the booster 3, the exhaust gas flows out from the outlet of the booster turbine, and flows into the power turbine 5 via the power turbine inlet pipe 4. The power turbine 5 is driven by the exhaust gas with high energy. The central shaft of the power turbine 5 rotates continuously, and 10 the output gear 6 of the power turbine transmits the power to the input gear 7 of the hydraulic coupling which is in engagement drive with the output gear 6. The number of teeth of the output gear 6 of the power turbine is lower than that of the input gear 7 of the hydraulic coupling, and the engagement therewith reduces the rotation speed and increase the torque. The output end of the 15 hydraulic coupling 8 is engaged with the input gear of the reduction gear set 9, and the step-by-step transmission of the reduction gears further reduces the rotation speed and obtains step by step increases in torque increasing. The power output of the reduction gear set 9 transmits the power to the coaxially connected input end 12 of the overrun clutch through the power input part 11 of the 20 overrun clutch, and the output end 14 of the overrun clutch 13 is coaxially connected with the crankshaft 15 or the flywheel 16. When the rotation speed of the input end 12 of the overrun clutch 13 is higher than that of the crankshaft 15 or flywheel 16, the power input part 11 of the overrun clutch and the output shaft of the overrun clutch 13 rotate 25 synchronously to transmit the torque to the crankshaft and increase the moment of the crankshaft, namely increasing the power of the internal combustion engine. On the contrary, when the rotation speed of the input end 12 of the overrun clutch 13 is lower than that of the crankshaft 15 or flywheel 16, the input end 12 and the output end 14 of the overrun clutch 13 are completely 30 separate, and the power transmission is interrupted; the input end 12 and the - 12 output end 14 do not interfere with each other, thus avoiding the crankshaft 15 or the flywheel 16 from consuming the power of the internal combustion engine when affected by the exhaust gas recycling device. In the present invention, the exhaust gas recycling device is added into the 5 internal combustion engine without changing the original structure of the internal combustion engine. The exhaust gas recycling device of the internal combustion engine of the present invention has a compact structure. The power turbine of the exhaust gas recycling device of the internal combustion engine is pushed to rotate through the exhaust gas discharged from the exhaust pipe or the 10 booster turbine of the internal combustion engine, then the torque is transmitted to a crankshaft through a hydraulic coupling, a reduction gear set and a overrun clutch, so as to increase the moment of the crankshaft. The exhaust gas energy is thus more efficiently utilized, which improves the power of the internal combustion engine. In addition, the cycling of the exhaust gas reduces the 15 emission of the harmful gases in the exhaust gas, reducing noise and pollution. The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and 20 variations are possible in light of the above teachings. The exemplary embodiments were chosen and described in order to explain certain principles of the invention. It is intended that the scope of the invention be defined by the Claims appended hereto and their equivalents.

Claims

1. An exhaust gas recycling device of the internal combustion engine, which comprises: a power turbine fixedly connected with an exhaust pipe of the internal 5 combustion engine through a power turbine inlet pipe; and a reduction gear set engaged with an output gear of the power turbine; wherein the reduction gear set includes at least one pair of mutually engaged gears; and power output parts of the reduction gear set is connected with a crankshaft or a flywheel of the internal combustion wheel in a coaxial way. 10

2. The exhaust gas recycling device as claimed in clam 1, further comprises a booster that is disposed between the exhaust pipe of the internal combustion engine and the power turbine inlet pipe, wherein the exhaust pipe is fixedly connected to a turbine inlet of the booster through a booster inlet pipe, and a 15 turbine outlet of the booster is fixedly connected with the power turbine inlet pipe.

3. The exhaust gas recycling device as claimed in claim 1 or claim 2, further comprises a hydraulic coupling that is disposed between the power turbine and 20 the reduction gear set, wherein the hydraulic coupling comprises an input gear that is engaged with the output gear of the power turbine, and a power output end that is coaxially connected with the reduction gear set.

4. The exhaust gas recycling device as claimed in claim 3, further comprises an 25 overrun clutch that is disposed between the power output part of the reduction gear set and the crankshaft, wherein the overrun clutch includes a power input part connected to the power output part of the reduction gear set, and an output end coaxially connected with the crankshaft or fly wheel of the internal - 14 combustion engine.

5. The exhaust gas recycling device as claimed in claim 3, wherein the input gear of the hydraulic coupling is sleeved on the outer circumference of the input 5 end of the hydraulic coupling.

6. The exhaust gas recycling device as claimed in claim 4, wherein the power output part of the reduction gear set and the power input part of the overrun clutch are driven by a gear wheel, a chain wheel or a tooth-shaped synchronous 10 belt.

7. The exhaust gas recycling device as claimed in claim 4, wherein the power input part of the overrun clutch is sleeved on the outer circumference of the input end of the overrun clutch. 15

8. The exhaust gas recycling device as claimed in claim 3, further comprises a first protective cover that is disposed outside the hydraulic coupling and the reduction gear set, wherein the first protective cover is fixedly connected with a casing of the power turbine. 20

9. The exhaust gas recycling device as claimed in claim 8, further comprises a second protective cover that is disposed outside the hydraulic coupling and the reduction gear set, wherein the second protective cover is fixedly connected with the casing of the power turbine. 25