KR-20260067658-A - EGR valve

KR20260067658AKR 20260067658 AKR20260067658 AKR 20260067658AKR-20260067658-A

Abstract

The present invention relates to an EGR valve. One embodiment of the present invention provides an EGR valve comprising: a driving motor; a driving gear coupled to the motor shaft of the driving motor; a driven gear connected to the driving gear; a reciprocating unit arranged in a first direction that intersects the rotational axis of the driven gear and reciprocates along the first direction to open and close an exhaust gas passage; and a housing that accommodates the driving motor, the driving gear, the driven gear, and the reciprocating unit and forms an exhaust gas passage. The driven gear comprises a gear portion having a tooth profile formed on the outer circumference of a gear body that meshes with the driving gear, and a cam portion formed integrally with the gear portion and sharing the rotational axis with the gear portion. The reciprocating unit has at least a portion in contact with the cam contact surface of the cam portion and moves linearly according to the rotational movement of the driven gear.

Inventors

이종수
김진용

Assignees

주식회사 코렌스

Dates

Publication Date: 20260513
Application Date: 20241106

Claims (16)

Drive motor; A drive gear coupled to the motor shaft of the above-mentioned drive motor; A driven gear connected to the above driving gear; A reciprocating unit that is positioned in a first direction that is intersecting the rotation axis of the driven gear and reciprocates along the first direction to open and close an exhaust gas passage; and A housing that accommodates the driving motor, the driving gear, the driven gear, and the reciprocating unit and forms an exhaust gas passage; The above-mentioned driven gear is, A gear portion having a tooth profile formed on the outer surface of the gear body that meshes with the driving gear; and A cam portion formed integrally with the gear portion and sharing the rotation axis with the gear portion; comprising The above reciprocating movement unit is an EGR valve in which at least a portion contacts the cam contact surface of the cam portion and moves linearly according to the rotational movement of the driven gear.
In Article 1, An EGR valve in which the central axis corresponding to the longitudinal direction of the above-mentioned reciprocating unit is perpendicular to the rotation axis of the above-mentioned driven gear.
In Article 1, The above cam part is, An EGR valve formed by protruding in the axial direction of the rotation axis from the gear body, wherein the cam contact surface is formed parallel to the rotation axis.
In Article 1, The above cam part is, An EGR valve forming a spiral cam profile in which the distance from the center of rotation to the cam contact surface increases as the angle of rotation of the cam portion increases.
In Paragraph 4, The above cam profile is expressed in x,y coordinates, and , It is determined by, where a = offset value, R = base radius, 0° ≤ θ ≤ 360° EGR valve satisfying the conditions.
In Article 1, The above reciprocating movement unit is, A follower that contacts the cam contact surface of the cam portion; Valve head for opening and closing exhaust gas inlet; A valve shaft having the valve head at one end; A connecting part connecting the above-mentioned follower and the other end of the above-mentioned valve shaft; An EGR valve comprising a sliding pin fixed to the above-mentioned connection and positioned parallel to the rotation axis of the above-mentioned driven gear.
In Article 6, An EGR valve in which the rotation axis of the above-mentioned driven gear and the above-mentioned sliding pin are positioned on the extension line of the above-mentioned valve shaft.
In Article 6, The above sliding pin is inserted through the center of the above-mentioned follower, an EGR valve.
In Article 6, The above-mentioned driven gear further includes a guide portion formed in the gear body, and The above guide portion includes a guide groove into which at least a portion of the sliding pin is inserted, in an EGR valve.
In Article 9, The above guide portion is adjacent to the cam contact surface and is formed in a shape corresponding to the shape of the cam contact surface, in an EGR valve.
In Article 9, EGR valve, wherein when the above-described driven gear rotates, the guide portion moves relative to the sliding pin while the sliding pin is inserted into the guide groove.
In Article 9, An EGR valve in which the above sliding pin limits the rotational range of the above driven gear by interfering with one end or the other end of the above guide groove.
In Article 9, The above guide home is, An EGR valve, which is an internal space surrounded by a guide wall formed by protruding in the axial direction of the rotation axis from the gear body.
In Article 1, The above EGR valve is, A first elastic member provided on the opposite side of one side of the gear body where the cam portion is formed; and An EGR valve comprising a second elastic member provided in the above-mentioned reciprocating movement unit.
In Article 14, When defining the rotational direction of the driven gear that lowers the reciprocating movement unit as the second direction, The first elastic member provides elastic force to the driven gear so that the driven gear rotates in the opposite direction to the second direction, in an EGR valve.
In Article 14, The second elastic member provides elastic force to the reciprocating unit so that the reciprocating unit moves toward the rotation axis of the driven gear, EGR valve.

Description

EGR valve The present invention relates to an EGR valve. Generally, an automobile engine confines a mixture of fuel and air within a sealed cylinder and rapidly burns the carbon in the fuel through compression and ignition. The gases produced after combustion are expelled to the outside, and these expelled gases are referred to as exhaust gas. Water vapor and carbon dioxide constitute the majority of exhaust gas, while the remaining components include harmful substances such as carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx). The Exhaust Gas Recirculation (EGR) system is configured to reduce the generation of nitrogen oxides (NOx) by returning a portion of the exhaust gas to the intake manifold to lower the combustion temperature during continuous combustion of the mixture. The EGR system includes an EGR valve, which functions to add a portion of the exhaust gas to the mixture and draw it into the cylinder through valve control. An EGR valve comprises a housing in which an inlet and an outlet are formed, an opening/closing unit that selectively opens and closes the inlet, and a driving unit that operates the opening/closing unit. The inlet of the housing is connected to the engine's exhaust manifold, and the outlet is connected to the engine's intake manifold; thus, depending on the operation of the driving unit and the opening/closing unit, a portion of the exhaust gas discharged from the exhaust manifold is selectively moved to the intake manifold by the EGR valve. A conventional EGR valve includes a poppet shaft that reciprocates vertically as part of the opening/closing unit, and a poppet formed at the tip of the poppet shaft to open and close the exhaust gas inlet and outlet. In addition, an operating cam is provided to reciprocate the poppet shaft vertically; however, when the rotational motion of the operating cam is converted into the vertical motion of the opening/closing unit, there is a problem in that a large-capacity drive motor must be used to obtain the desired driving force because there is a significant loss of driving force. In addition, there were difficulties in controlling the opening of the valve unit because the vertical movement of the valve unit due to the rotational movement of the operating cam occurred non-linearly. FIG. 1 is a perspective view illustrating an EGR valve according to one embodiment of the present invention. FIG. 2 is a perspective view showing the state in which the second housing of the EGR valve of FIG. 1 has been removed. FIG. 3 is a perspective view showing the state in which the first housing of the EGR valve of FIG. 1 has been removed. FIG. 4 is a side view of a part of the driven gear and reciprocating movement unit of FIG. 3. Figure 5 is a front view of a part of the driven gear and reciprocating movement unit of Figure 4, viewed from the front. FIG. 6 is a front view showing the state in which the driven gear of FIG. 5 is rotated. FIG. 7 is a diagram illustrating the relationship between the profile of a cam portion and a follower portion according to an embodiment of the present invention. Figure 8 is a drawing for comparing and explaining the profile of the cam section. FIG. 9 is a front view showing the exhaust gas inlet of the EGR valve of FIG. 1 in a closed state. FIG. 10 is a front view showing the exhaust gas inlet of the EGR valve of FIG. 1 in an open state. FIG. 11 is a graph showing the travel distance of the valve head according to the rotation angle of the cam portion of an EGR valve according to one embodiment of the present invention. Hereinafter, the following embodiments will be described in detail with reference to the attached drawings. When describing with reference to the drawings, identical or corresponding components are given the same reference numerals, and redundant descriptions thereof will be omitted. In describing the present invention, if it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the gist of the embodiments of the present invention, such detailed description will be omitted. Since the embodiments are capable of various modifications, specific embodiments are illustrated in the drawings and described in detail in the detailed description. The effects and features of the embodiments and the methods for achieving them will become clear by referring to the details described below in conjunction with the drawings. However, the embodiments are not limited to those disclosed below and can be implemented in various forms. In the drawings, parts unrelated to the explanation have been omitted to clearly explain the invention, and similar parts throughout the specification have been given similar reference numerals. In the following embodiments, terms such as first, second, etc. are used not in a limiting sense, but for the purpose of distinguishing one component from another. In the following embodiments, singular expressions include plural expr