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CN-122014464-A - Extended range engine EGR valve and motor shaft lever protection device thereof

CN122014464ACN 122014464 ACN122014464 ACN 122014464ACN-122014464-A

Abstract

The invention discloses an extended-range engine EGR valve and a motor shaft lever protection device thereof, and relates to the field of electric EGR valve configuration of new energy extended-range internal combustion engines. The invention comprises a first protective cover sleeved at the valve plate end of a motor shaft rod, a guide surface is constructed at one side of the valve plate facing the valve plate, a containing cavity with an open top surface is constructed at one side of the valve plate facing the motor shaft rod, a second protective cover sleeved at the positioning end of the motor shaft rod, the first end is in interference fit with a valve body mounting seat, and the second end extends to the containing cavity and is in fit sliding contact with the outer wall of the motor shaft rod, so that the problem of coking and clamping stagnation of the existing electric EGR valve is solved.

Inventors

  • ZHAO QINGFEI
  • PENG GU
  • MO RUI
  • WANG PENG
  • SU JINYU
  • YANG HANHUI
  • ZHANG LIJIN

Assignees

  • 昆明云内动力股份有限公司

Dates

Publication Date
20260512
Application Date
20260128

Claims (8)

  1. 1. An extended range engine EGR valve motor shaft guard comprising: the first protection cover (1) is sleeved at the end of the valve plate (3) of the motor shaft lever (2), a guide surface is formed on one side of the valve plate (3), and a containing cavity (4) with an open top surface is formed on one side of the valve plate towards the motor shaft lever (2); The second protection casing (5) is sleeved at the positioning end of the motor shaft lever (2), the first end is in interference fit with the valve body mounting seat, and the second end stretches to the accommodating cavity (4) and is in fit sliding contact with the outer wall of the motor shaft lever (2).
  2. 2. The protection device for the motor shaft lever (2) of the extended range engine EGR valve according to claim 1, wherein the first protection cover (1) comprises a first cone cover (6) which is in positioning connection with the motor shaft lever (2), a first barrel cover (7) is coaxially connected to the top end of the first cone cover (6) which extends upwards, a second cone cover (8) is coaxially connected to the top end of the first barrel cover (7), and the moving range of the second end of the second protection cover (5) is not more than the top end of the second cone cover (8).
  3. 3. The protection device for the motor shaft lever (2) of the extended range engine EGR valve according to claim 2, wherein the first cone cover (6) comprises a mounting part connected with the motor shaft lever (2) and a first cone part arranged at the top end of the mounting part, and the inner diameter and the outer diameter of the first cone part are synchronously increased from bottom to top.
  4. 4. The protection device for the motor shaft lever (2) of the extended range engine EGR valve according to claim 2, wherein the second cone cover (8) comprises a second cone portion connected with the first barrel cover (7) and a horizontal annular plate coaxially arranged at the top end of the second cone portion, the horizontal annular plate is connected with the second cone portion through an arc chamfer, and the inner diameter and the outer diameter of the second cone portion are increased synchronously from bottom to top.
  5. 5. The extended range engine EGR valve motor shaft (2) protection device of claim 2, characterized in that the inner and outer sides of the first cone cover (6), the first barrel cover (7) and the second cone cover (8) serve as the receiving chamber (4) and the guide surface, respectively.
  6. 6. The protection device for the motor shaft lever (2) of the extended range engine EGR valve according to claim 1, wherein the second protection cover (5) comprises a second barrel cover (9) serving as the first end, a third cone cover (10) serving as the second end is coaxially arranged at the lower end of the second barrel cover (9), the inner diameter and the outer diameter of the second cone cover (8) are gradually reduced from top to bottom, the lower end of the second cone cover (8) is in sliding fit with the outer wall of the motor shaft lever (2), and the inner diameter of the second barrel cover (9) is larger than the outer diameter of the motor shaft lever (2).
  7. 7. An extended range engine EGR valve comprises a body which is provided with a motor shaft lever (2), and is characterized in that the motor shaft lever (2) passes through a valve body installation seat (11), a valve body exhaust gas outflow opening (12) is formed on the side surface of the valve body installation seat (11), a valve body exhaust gas inflow opening (13) is formed on the bottom surface of the valve body installation seat (11), and a valve plate (3) end of the motor shaft lever (2) passes through the valve body exhaust gas inflow opening (13) and is used for controlling the opening and closing of the valve body exhaust gas inflow opening (13); the motor shaft lever (2) is provided with the protection device of the extended range engine EGR valve motor shaft lever (2) according to any one of claims 1 to 6; The guide surface is disposed toward the valve body exhaust gas outlet (12).
  8. 8. The extended range engine EGR valve according to claim 7, characterized in that a shaft positioning sleeve (14) is arranged in the valve body mounting seat (11), and the motor shaft (2) is coaxially arranged in a sliding manner through the shaft positioning sleeve (14); the shaft rod positioning sleeve (14) comprises a positioning tube (15) in interference connection with the valve body mounting seat (11), a sleeve pipe (16) with the outer diameter reduced is coaxially communicated with the lower end of the positioning tube (15), the first end of the second protection cover (5) is sleeved on the outer wall of the sleeve pipe (16), and a buffer cavity (17) with the thickness identical to that of the sleeve pipe (16) is formed between the second protection cover (5) and the motor shaft rod (2).

Description

Extended range engine EGR valve and motor shaft lever protection device thereof Technical Field The invention relates to the field of electric EGR valve configuration of new energy range extender internal combustion engines, in particular to an extended range engine EGR valve and a motor shaft lever protection device thereof. Background With the continuous popularization of new energy sources, the extended range technology becomes a mainstream technology, the technology of an extended range special internal combustion engine is updated and iterated fast, and meanwhile, with the continuous upgrading of national automobile exhaust emission regulations, the emission limit value is more and more strict, the national and foreign emission regulations are continuously upgraded, the emission regulation standard of the light automobile pollutant emission limit value and the measurement method (the sixth stage of China) (GB 18352.6-2016) is newly executed, and the internal combustion engine is required to meet the emission regulation requirement by implementing the new technology, the new method and the new technology, and the emission requirement of nitrogen oxide compounds is gradually tightened. By improving the engine body, the EGR (exhaust gas recirculation) is increased, so that the EGR is a main measure for reducing nitrogen oxides in common use for diesel engines. Exhaust gas discharged from a diesel engine is an inert gas, and after mixing intake air and recirculated exhaust gas, the heat capacity of the mixed gas is increased, more heat energy can be absorbed, combustion temperature is reduced, generation of nitrogen oxides is suppressed, oxygen content of the mixed gas is diluted due to addition of exhaust gas, combustion speed and combustion temperature are also reduced, nitrogen oxides are reduced, HC and PM particulates and the like in the EGR gas are inevitably present unless the EGR gas passes through a series of catalytic conversion devices and particulate matter filtering devices, and therefore HC (hydrocarbon) and PM particulates and the like contained in the EGR gas are deposited on the inner surface of the EGR system while the EGR gas is cooled, and contaminant deposition in the EGR system is difficult to avoid. These deposits can degrade the performance of the EGR system over time. The electric EGR valve is a key core part in an EGR system, the opening degree of the electric EGR valve is used for controlling the flow of circulating exhaust gas, part of engine tail gas is introduced into the EGR cooler for cooling, the cooled exhaust gas enters an engine air inlet pipe after passing through the electric ER valve and is mixed with fresh air to form mixed gas, and the mixed gas enters a combustion chamber to participate in combustion of an internal combustion engine. When the exhaust gas passes through the electric EGR valve, the exhaust pollutant in the exhaust gas can be attached to the motor shaft rod, along with the increase of attachments, the attachments are deposited for a period of time after the internal combustion engine is stopped, the attachments are cooled to be coked, the coked texture is hard, the coked cannot fall off automatically, and the motor shaft rod of the electric EGR valve is blocked or dead, so that the precision of the electric EGR valve is inaccurate or invalid, the EGR system is abnormal, and the exhaust gas of the internal combustion engine is discharged beyond the standard. The problem that the clamping stagnation is common to the common EGR valve is solved, and the problem of coking clamping stagnation cannot be completely solved due to the fact that engine tail gas pollutants exist in the use working condition environment. The electric EGR valve is cleaned by adopting the measures at the present stage, namely, the electric EGR valve is disassembled after the engine is operated for a period of time to clean the valve body and the motor shaft lever by using special materials, and the coking is seriously required to be polished and removed, so that the cleaning work is generally carried out when the engine is maintained. Disclosure of Invention The invention aims to provide an extended-range engine EGR valve and a motor shaft lever protection device thereof, which solve the problem of coking and clamping stagnation of the existing electric EGR valve. In order to solve the problems, the invention adopts the following technical means: an extended range engine EGR valve motor shaft guard comprising: The first protective cover is sleeved at the valve plate end of the motor shaft rod, a guide surface is formed on one side of the valve plate, and an accommodating cavity with an open top surface is formed on one side of the valve plate; the second protection casing is established at the locating terminal of motor axostylus axostyle, first end and valve body mount pad interference fit, the second end stretch to hold the chamber and with the outer wall laminating sliding contac