CN217999743U - EGR valve rod structure with anti-blocking function - Google Patents
EGR valve rod structure with anti-blocking function Download PDFInfo
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- CN217999743U CN217999743U CN202222382036.3U CN202222382036U CN217999743U CN 217999743 U CN217999743 U CN 217999743U CN 202222382036 U CN202222382036 U CN 202222382036U CN 217999743 U CN217999743 U CN 217999743U
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Abstract
The utility model relates to a EGR valve rod structure with anti-sticking pauses, include: a valve body and a valve cover; the valve body is provided with an upper oil-containing rolling bearing and a lower oil-containing rolling bearing which are used for sealing and supporting the valve rod, the outer diameter of the valve rod is in clearance fit with the position of the embedded steel sleeve of the valve body at the position of the upper oil-containing rolling bearing, and a section of sealing and carbon deposit scraping facility with the valve rod in close fit and loose fit with the steel sleeve is formed. The utility model discloses a what set up between valve rod and the steel bushing scrapes the carbon deposit structure, has solved the carbon deposit between valve rod and the bearing, has eliminated the problem that the valve rod operation card went on. The valve rod and the sector gear adopt an injection molding integrated process, the process is compact in structure, knurling is conducted on the surface of the valve rod at the joint, and the firmness of connection of the gear and the valve rod is enhanced. The valve cover and the valve body are sealed through the sealing ring without a discharge hole, so that external corrosive gas is prevented from entering the cavity of the speed reducing structure to corrode internal parts.
Description
Technical Field
The utility model relates to a EGR valve rod structure with anti-sticking dun is the mechanical structure of gasoline engine's environmental protection facility, is a structure that is used for automobile engine exhaust gas recirculation EGR valve.
Background
The exhaust gas recirculation system has the function of returning part of exhaust gas generated by the engine to the cylinder, because the recirculated exhaust gas has inertia and does not participate in chemical reaction, the mixed gas entering the cylinder is diluted, the oxygen concentration is reduced, the calorific value of combustible mixed gas is reduced, and in addition, because CO in the exhaust gas 2 And the heat capacity of the water vapor is larger, so that the specific heat capacity of the mixed gas is increased, and the peak temperature in the cylinder is reduced. Both of these increase the ignition delay period of the engine combustion process, slow the combustion rate, and lower the maximum in-cylinder combustion temperature, thereby destroying NO x Generating the required high-temperature oxygen-enriched condition to ensure NO of the engine x And the emission is reduced.
An EGR valve is an electromechanical integrated device installed in an EGR system to control flow. Because the engine works under different working conditions and needs different EGR rates, namely different amounts of exhaust gas, the flow of the EGR needs to be controlled, the work is completed by the EGR valve, and the EGR valve has a self-resetting function when a system is in failure. Poor engine operation can be caused due to unsmooth or blockage of EGR operation, and vehicles can be flameout in low-speed running under extreme conditions, so that traffic accidents can occur.
The material of the flow channel part of the EGR butterfly valve of the existing gasoline engine is aluminum alloy or cast iron, the exhaust gas has acidity and alkalinity to corrode the flow channel material, the EGR exhaust gas is condensed into corrosive liquid under the low-temperature condition, the valve body is easy to corrode, crystals are generated to be piled at the position of a valve port, or the crystals are drilled into the upper guide position and the lower guide position of a valve rod, and the problem of coking and carbon deposition of the exhaust gas causes the poor operation of the EGR valve. One end of a valve rod supporting structure of an EGR valve in the market is a rolling bearing, the other end of the valve rod supporting structure is a sliding bearing structure, and because a sliding bearing has a larger gap with a valve rod and is not provided with a sealing device at the position close to a valve port, a valve body corrodes crystals, and waste gas, coking and carbon deposition and other impurities enter the gap of the sliding bearing, the EGR valve is unsmooth in operation.
Disclosure of Invention
In order to overcome prior art's problem, the utility model provides a EGR valve rod structure with anti-sticking pauses. The connecting structure adopts a valve body with an embedded steel sleeve and a double-oil-containing rolling bearing structure, and a sealing carbon deposit scraping structure is arranged between the valve rod and the steel sleeve, so that the problems of internal corrosion of the valve body and carbon deposit of the valve rod are solved.
The purpose of the utility model is realized like this: an EGR valve stem structure with anti-sticking includes: the valve comprises a valve body, wherein the top of the valve body is provided with a valve cover, the side surface of the valve cover is provided with a motor, and a sealing strip is arranged between the valve body and the valve cover; the valve cover is provided with an angle sensor and a corresponding electronic element for controlling the opening and closing angle of the valve clack; the valve comprises a valve body, a valve rod, a sector gear, a duplex gear, a motor gear and a valve rod, wherein the valve body is provided with a steel sleeve with a waste gas flow channel at the center part, the two ends of the steel sleeve are an inlet and an outlet of waste gas, the center of the steel sleeve is provided with the valve rod vertical to the waste gas flow channel, the top end of the valve rod is fixedly connected with the sector gear, the sector gear is meshed with the duplex gear, and the duplex gear is meshed with the motor gear arranged on a motor shaft; the valve body is provided with an upper oil-containing rolling bearing and a lower oil-containing rolling bearing which are used for sealing and supporting the valve rod, the outer diameter of the valve rod is in clearance fit with the position of a steel sleeve hole embedded in the valve body at the position of the upper oil-containing rolling bearing, and the valve rod and the steel sleeve are in one-section close fit, one-section loose fit sealing and carbon deposit scraping facilities are formed.
Furthermore, the valve body is made of cast iron or cast aluminum, and the steel sleeve is made of high-temperature-resistant and corrosion-resistant steel.
Furthermore, the outer diameters of the upper and lower oil-containing rolling bearings are connected with the valve body in an interference fit manner.
Furthermore, a knurl is arranged at the joint of the top end of the valve rod and the sector gear.
Furthermore, a wave-shaped spring is arranged between the motor and the valve body.
The utility model has the advantages and beneficial effects that: the utility model adopts an embedded steel sleeve structure, ensures that the runner of the inner cavity of the valve body is not provided with aluminum alloy or is made of cast iron, and the contact part of the inner runner and the waste gas is made of corrosion-resistant material, thus avoiding the problem of jamming caused by valve body corrosion; the double-rolling bearing structure with the sealing function is adopted, so that the double-rolling bearing structure has the advantages of high precision, small resistance, low noise, small size of a sealing structure and good sealing effect, and can prevent the clamping stagnation problem caused by the fact that waste gas particles and carbon deposit enter the shaft hole. The carbon deposit scraping structure arranged between the valve rod and the steel sleeve solves the carbon deposit between the valve rod and the bearing and eliminates the problem that the valve rod is blocked in operation. The valve rod and the sector gear adopt an injection molding integrated process, the process is compact in structure, knurling is performed on the surface of the valve rod at the joint, and the firmness of connection of the gear and the valve rod is enhanced. The valve cover and the valve body are sealed through the sealing ring without a discharge hole, so that external corrosive gas is prevented from entering the cavity of the speed reducing structure to corrode internal parts.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic diagram of a structure according to a first embodiment of the present invention;
fig. 2 is a schematic view of a structure for sealing and scraping deposited carbon according to a first embodiment of the present invention, which is an enlarged view of a point a in fig. 1.
Detailed Description
The first embodiment is as follows:
the present embodiment is an EGR valve stem structure with anti-sticking, as shown in fig. 1. The embodiment comprises the following steps: valve body 1, the valve body top be equipped with valve gap 2, the side is equipped with motor 3, is equipped with sealing strip 101 between valve body and the valve gap. The valve cover is provided with an angle sensor 201 and a corresponding electronic element 5 for controlling the opening and closing angle of the valve clack 4; the central part of the valve body is provided with a steel sleeve 6 with a waste gas flow channel, the two ends of the steel sleeve are an inlet and an outlet of waste gas (the axial direction of the steel sleeve is vertical to the paper surface in figure 1, so the inlet and the outlet of the waste gas are superposed), the center of the steel sleeve is provided with a valve rod 7 vertical to the waste gas flow channel, and the valve rod is fixedly connected with the valve clack; the top end of the valve rod is fixedly connected with a sector gear 8, the sector gear is meshed with a duplicate gear 9, and the duplicate gear is meshed with a motor gear 10 arranged on a motor shaft; a magnet 801 for detecting the rotation angle of the sector gear and a torsion spring 11 for return are fixed to the sector gear. The valve body is provided with an upper oil-containing rolling bearing 12 and a lower oil-containing rolling bearing 13 which are used for sealing and supporting the valve rod, the outer diameter of the valve rod is in clearance fit with the position of the embedded steel sleeve of the valve body at the position of the upper oil-containing rolling bearing, and a sealing and carbon deposit scraping facility with a section of tight fit 701 and a section of loose fit 702 of the valve rod and the steel sleeve is formed, as shown in figure 2.
The working process of the EGR valve is as follows: the valve body and steel sleeve exhaust gas flow passage is used for introducing exhaust gas discharged from an engine manifold into an exhaust gas recirculation passage to obtain a high EGR rate. The amount of waste gas entering the recirculation passage is controlled by the opening and closing of a valve clack, and the valve clack is controlled by a motor: the motor gear on the motor is meshed with the large gear of the duplicate gear, the small gear on the duplicate gear is meshed with the sector gear, the power of the motor is transmitted to the sector gear, the sector gear drives the valve rod to rotate together, the valve rod drives the valve clack to rotate, and the exhaust gas flow is adjusted by controlling the size of the opening angle adjusting channel of the valve clack. The sector gear drives the magnet to rotate simultaneously, the sensor transmits an electric signal to the H bridge through the magnetic force line of the cutting magnet and then to the ECU, and signal input to the ECU is achieved.
The valve body described in this embodiment is the main body of the structure described in this embodiment, the valve rod is supported by the valve body, a steel sleeve is embedded in the valve body, and an exhaust gas flow channel is arranged on the steel sleeve. The valve body is connected to the exhaust manifold of the engine and the EGR cooler pipe by respective coupling means (e.g., flange means, etc.).
The exhaust gas flow passage is arranged in a through hole in the middle of a steel sleeve, and the steel sleeve is embedded in a valve body made of cast aluminum or cast iron. During manufacturing, the steel sleeve is embedded into the valve body die and integrally cast and formed with the valve body, and in order to prevent the steel sleeve and the valve body from loosening, the outer surface of the steel sleeve is subjected to anti-skid treatment such as grooving, flattening milling or knurling before die casting. A valve clack capable of being opened and closed in a rotating mode is arranged in a through hole (an exhaust gas flow passage) in the middle of the steel sleeve. An end face sealing structure is formed between the valve clack and the steel sleeve, and the opening and closing of the EGR valve are realized. The valve body is of an aluminum alloy or cast iron structure, and the steel sleeve is made of high-temperature-resistant and corrosion-resistant materials. The embedded steel sleeve structure ensures that no aluminum alloy or cast iron material is exposed in the exhaust gas flow channel, so that the contact part of the interior of the exhaust gas flow channel and the exhaust gas is made of corrosion-resistant material, and the problem of clamping stagnation caused by corrosion of the valve body is avoided.
The valve cover forms sealing with the valve body through the sealing ring, and is not provided with a drainage hole, so that external corrosive gas is prevented from entering the cavity of the speed reducing structure to corrode internal parts. The valve gap is equipped with the electronic control facility, transmits the signal of telecommunication through embedded terminal, controls the aperture of valve clack.
The valve rod is a facility for driving the valve clack to open and close, is arranged at the middle line part of the steel sleeve, radially penetrates through the steel sleeve, and is vertical to the middle line axis of the steel sleeve, namely vertical to the exhaust gas flow channel.
The action of the valve stem is formed by the drive element. The driving element comprises a motor, a motor gear, a duplicate gear and a sector gear. The motor is in interference connection with the motor gear, the duplicate gear is meshed with the sector gear, the sector gear is fixedly connected with the valve rod and drives the valve rod to rotate, and then the valve clack is driven to rotate to open and close.
The valve rod and the sector gear are integrally formed by injection molding, and facilities such as spot facing or knurling can be arranged at the position where the valve rod and the sector gear are combined for well combining the valve rod and the sector gear. The integrated injection molding process of the valve rod and the sector gear has a compact structure, and the firmness of connection between the gear and the valve rod is enhanced.
The valve rod can be supported by an oil-containing rolling bearing. The upper end and the lower end of the valve body are respectively provided with 1 oil-containing rolling bearing, and the outer diameter of each rolling bearing is in interference press-fitting with a bearing hole of the valve body. The oil-retaining bearing can be a rolling bearing, high-temperature-resistant grease is arranged between rolling bodies of the oil-retaining rolling bearing, the sealing effect is achieved by utilizing the characteristic that viscosity can be kept unchanged at high temperature, the leakage of waste gas from a gap between the valve rod and a steel sleeve is prevented, particularly the leakage of the waste gas to the direction of a driving element in a valve cover is prevented, the corrosion to other components in a transmission cavity is avoided, carbon deposition generated on the valve rod is reduced, and the rotation resistance of the valve rod is prevented from being increased.
The outer diameter of the valve rod is in clearance fit with the steel sleeve hole to form a sealing and carbon deposit scraping facility. The section of the valve rod, which is shorter in axial dimension (section 701 in fig. 2) at the matching position with the steel sleeve, is a tight matching section, the matching clearance of the shaft hole of the section is smaller, the sealing performance is better, the section of the valve rod continuously extends downwards to form loose matching (section 702 in fig. 2), and the clearance between the valve rod and the steel sleeve hole of the section is slightly larger. The carbon deposit to be formed on the valve rod is overcome by the rotary motion of the valve rod by utilizing a slightly smaller gap and the rotary motion of the valve rod, so that the carbon deposit is scraped and prevented from being formed. The structure has the advantages of playing a role in sealing and scraping carbon deposition, avoiding direct impact of load on the sealing structure, strengthening the sealing effect of the bearing and prolonging the service life of the sealing structure. The oil-containing rolling bearing with the sealing structure has small structure size and good sealing effect, and can prevent the problem of clamping stagnation caused by the fact that waste gas particles and carbon deposit enter the shaft hole.
The side face of the valve clack and the end face form a certain angle, the projection shape of the end face under the angle is circular, the end face of the valve clack is tightly attached to the surface of the inner cavity of the valve body steel sleeve to realize valve port sealing, the sealing is surface sealing, and the sealing effect is good.
The reset torsion spring has the functions that: the valve clack is used for ensuring that the valve clack is reset to the initial state under the condition that the EGR valve has no driving force (under the condition of power failure).
Because valve rod and valve clack are the moving part to the valve clack receives the impact of waste gas (waste gas is engine exhaust, has the pulsation impact), the adoption of valve rod and valve clack is very reliable inlays and connects, promptly: a rectangular hole is axially formed in the valve rod, the size of the hole is matched with the shape of the cross section of the valve clack penetrating through the central axis, so that the valve clack can be inserted into the rectangular hole, and the valve clack is equivalently embedded into the valve rod. Because the valve clack needs accurate location, consequently can not adopt the direct and valve rod welded mode of valve clack with embedding in the valve rod to avoid because the valve clack deformation that the welding produced influences the switching faying face of valve clack and steel bushing. Therefore, the valve rod and the valve clack are fastened by screws, however, the screws can be loosened due to the screw fastening, and for this reason, the tail part of the screw penetrating through the valve rod and the valve clack is welded with the valve rod in a spot mode to form stable combination, so that the screws are prevented from being loosened. One, two, or more, typically 180 degrees apart, spot welds may be provided for one screw.
One side of the valve body is provided with a motor component which comprises a motor, a motor gear, a motor flange and the like, a chip for controlling the rotation of the motor, a corresponding electronic element and an angular displacement sensor arranged in the valve cover, and the lower end of the motor is provided with an anti-vibration device. The anti-vibration facilities can be wave-shaped springs or soft pads and the like, and prevent the motor rotor from axially displacing under the vibration working condition of the engine.
The installation process of the valve is as follows: the exhaust gas valve comprises a valve body and a steel sleeve embedded or cast at the position of a valve port of the valve body, wherein the steel sleeve is provided with an exhaust gas flow channel and a bearing hole for supporting a valve rod, the upper side and the lower side of the flow channel are respectively provided with 1 rolling bearing, the outer diameter of each bearing is in interference fit with the bearing hole of the valve body, the bearing is pressed in place, and the bearing at the lower end is provided with a stainless steel plug for sealing. When the torsion spring is installed, one end of the torsion spring is installed on the valve body, and the other end of the torsion spring is installed at the limiting position of the sector gear. Sector gear moulds plastics to valve rod tip, passes two oily antifriction bearing hole backs with the valve rod, and certain pretightning force is applyed to the spring to rotatory certain angle, and it is downthehole to insert the valve clack the length direction of valve rod after that, connects valve clack and valve rod through the screw fixed, and later the spot welding screw is locking processing. And pressing the duplicate gear shaft onto the valve body. The wave spring pad is placed at the bottom of a motor cavity of the valve body, and then a motor assembly with a motor flange and a motor gear is installed at a seam allowance of the motor of the valve body and is fixed through screws. And mounting the duplicate gear to the duplicate gear shaft. And fixing the chip assembly to the upper cover in a hot melting mode. The sealing ring is placed in the sealing groove of the upper cover, and the upper cover assembly and the valve body assembly are fixedly connected through the screw.
Example two:
the embodiment is an improvement of the first embodiment, and is a refinement of the first embodiment about the valve body and the steel sleeve. The valve body is made of cast iron or cast aluminum, and the steel sleeve is made of high-temperature-resistant and corrosion-resistant steel.
Cast iron and cast aluminum have poor high temperature resistance and corrosion resistance, but have good casting manufacturability and are suitable for casting various complex shapes.
Example three:
this embodiment is a modification of the above-described embodiment, and is a refinement of the above-described embodiment regarding the oil-impregnated rolling bearing. The outer diameter of the upper and lower oil-containing rolling bearings is connected with the valve body in an interference fit manner.
The oil-retaining rolling bearing is an oil-retaining sealing bearing with a drawn outer ring roller pin, high-temperature-resistant grease is arranged in the oil-retaining sealing bearing, the oil-retaining rolling bearing can continuously lubricate a rolling body, an outer ring and a valve rod of the outer ring, has a sealing effect, prevents waste gas from leaking into a valve cover, prevents other components in a valve cover cavity from being corroded, reduces carbon deposition on the valve rod, and influences normal operation of a valve.
Example four:
this embodiment is a modification of the above-described embodiment, and is a refinement of the above-described embodiment with respect to the valve stem. The valve rod top and sector gear junction described in this embodiment are equipped with the annular knurl.
The valve rod and the sector gear adopt an injection molding integrated process, and the surface of the joint of the valve rod and the sector gear is knurled, so that the valve rod and the sector gear are more firmly connected.
Example five:
this embodiment is an improvement of the above-described embodiment, and is a refinement of the above-described embodiment with respect to the motor. A wave-shaped spring is arranged between the motor and the valve body.
The motor is connected with the valve body through the flange, namely there is certain distance between the barycenter of motor and the installation face, and this distance can produce certain vibrations in the motor work, and consequently this embodiment sets up jar-proof pad in the bottom in motor storehouse (the motor storehouse is the position of setting in valve body one side and holding the motor), reduces the vibrations of motor.
Finally, it should be noted that the above is only used for illustrating the technical solution of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred arrangement, it should be understood by those skilled in the art that the technical solution of the present invention (such as the overall structural form of the valve body, the form of the valve flap and the form of the valve rod, etc.) can be modified or replaced with equivalents without departing from the spirit and scope of the technical solution of the present invention.
Claims (5)
1. An EGR valve stem structure with anti-sticking includes: the valve comprises a valve body, wherein a valve cover is arranged at the top of the valve body, a motor is arranged on the side surface of the valve body, and a sealing strip is arranged between the valve body and the valve cover; the valve cover is provided with an angle sensor and a corresponding electronic element for controlling the opening and closing angle of the valve clack; the center of the valve body is provided with a steel sleeve with a waste gas flow channel, the two ends of the steel sleeve are an inlet and an outlet of waste gas, the center of the steel sleeve is provided with a valve rod vertical to the waste gas flow channel, and the valve rod is fixedly connected with the valve clack; the top end of the valve rod is fixedly connected with a sector gear, the sector gear is meshed with a duplicate gear, and the duplicate gear is meshed with a motor gear arranged on a motor shaft; the valve is characterized in that the valve body is provided with an upper oil-containing rolling bearing and a lower oil-containing rolling bearing which are used for sealing and supporting the valve rod, the outer diameter of the valve rod is in clearance fit with the position of a steel sleeve hole embedded in the valve body at the position of the upper oil-containing rolling bearing, and a sealing and carbon deposit scraping facility with a section of tight clearance fit and a section of loose clearance fit between the valve rod and the steel sleeve is formed.
2. The EGR valve stem structure of claim 1, wherein said valve body is cast iron or cast aluminum, and said steel sleeve is made of high temperature and corrosion resistant steel.
3. The EGR valve stem structure of claim 2, wherein the outer diameters of the upper and lower oil-impregnated rolling bearings are connected with the valve body in an interference fit manner.
4. The EGR valve stem structure of claim 3 wherein the junction of said valve stem tip and said gear segment is knurled.
5. The EGR valve stem structure of claim 4, wherein a wave spring is provided between said motor and said valve body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222382036.3U CN217999743U (en) | 2022-09-08 | 2022-09-08 | EGR valve rod structure with anti-blocking function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222382036.3U CN217999743U (en) | 2022-09-08 | 2022-09-08 | EGR valve rod structure with anti-blocking function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217999743U true CN217999743U (en) | 2022-12-09 |
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ID=84288623
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222382036.3U Active CN217999743U (en) | 2022-09-08 | 2022-09-08 | EGR valve rod structure with anti-blocking function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217999743U (en) |
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2022
- 2022-09-08 CN CN202222382036.3U patent/CN217999743U/en active Active
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