KR102178143B1 - Actuator for Exhaust Gas Recirculation valve with high response characteristics - Google Patents

Abstract

The present invention relates to an actuator for an exhaust gas recirculation valve having excellent response characteristics, wherein a shaft, which is the center of rotation of a motor used in the actuator for an exhaust gas recirculation valve, is implemented in a fixed type to be prevented from rotating with a rotor, so that bearings can be removed. Moreover, washers are used at both ends of the rotor to reduce the inertia of the rotor so that excellent acceleration and deceleration functions are provided.

Description

Actuator for Exhaust Gas Recirculation valve with high response characteristics}

The present invention relates to an exhaust gas recirculation technology for supplying a part of exhaust gas back to a combustion chamber, and in particular, to an actuator for an exhaust gas recirculation valve having excellent response characteristics.

Increasing social interest in the environment has been materialized in recent years in the form of introduction and reinforcement of vehicle fuel economy regulations and establishment of greenhouse gas regulations. Exhaust Gas Recirculation (EGR) is one of the technologies commonly used to reduce nitrogen oxides. It is a technology that supplies part of the exhaust gas back to the combustion chamber. It was applied to gasoline engines in the 1970s and is now diesel engines. It has been used up to.

In particular, the exhaust gas recirculation (EGR) function in the vehicle is highly dependent on the performance of the actuator to regulate the flow rate of the exhaust gas. Actuators for exhaust gas recirculation valves ranged from the simplest solenoid valves to DC motors to the application of three-phase motors, and the biggest reason for the change of application targets is the demand for various functions of exhaust gas recirculation valves and high power density. Is due to the demands of

In the case of an electronic exhaust gas recirculation (EGR) valve, precise control to accurately supply the necessary exhaust gas to the combustion chamber is possible, and nitrogen oxides can be reduced. This is because an electric motor can be used to actively utilize excellent acceleration and deceleration functions, and for this, research is being conducted to minimize the inertia of the rotor of the motor acting as a factor that hinders deceleration.

Republic of Korea Patent Publication No. 10-2001-0046091 (2001.06.05) proposes a technique to reduce the inertia of the rotor by implementing the rotor in a coreless form to reduce the mass of the rotor. Meanwhile, Korean Utility Model Registration No. 20-0247499 (2001.09.10) proposes a technique to reduce the inertia of the rotor by configuring the rotor poles in a stacked structure of the left and right protrusions.

The inventor of the present invention implements the shaft, which is the rotation center of the motor used in the actuator for the exhaust gas recirculation valve, in a fixed type so that it does not rotate with the rotor, removes the bearing, and has washers at both ends of the rotor ( Washer) was used to reduce the inertia of the rotor to achieve excellent acceleration and deceleration functions, thereby improving the response characteristics of the exhaust gas recirculation valve actuator.

Republic of Korea Patent Publication No. 10-2001-0046091 (2001.06.05) Republic of Korea Utility Model No. 20-0247499 (2001.09.10)

The present invention implements a shaft, which is a rotational center of a motor used in an actuator for an exhaust gas recirculation valve, in a fixed type so that it does not rotate with the rotor, thereby reducing the inertia of the rotor by removing the bearing. Its purpose is to provide an actuator for an exhaust gas recirculation valve with excellent response characteristics.

Another object of the present invention is to provide an actuator for an exhaust gas recirculation valve capable of reducing the inertia of the rotor by using washers at both ends of the rotor.

According to an aspect of the present invention for achieving the above object, an actuator for an exhaust gas recirculation valve having excellent response characteristics comprises: a housing; A fixed shaft fixedly installed in the housing so as not to rotate; A rotor inserted into the fixed shaft and rotated around the fixed shaft; A stator providing a magnetic force that drives the rotor to rotate; An input-side worm gear and an output-side worm gear for converting rotational force of the rotor in a direction orthogonal to a direction in which the rotor rotates; An input side movable part and an output side movable part connected to each of the input side worm gear and the output side worm gear to input and output exhaust gas to circulate the exhaust gas; It is formed on both sides of the housing, and the input side exhaust gas recirculation valve and the output side exhaust gas recirculation valve are respectively connected to intake or exhaust the exhaust gas, and the input side movable part and the output side movable part each include an intake port and an exhaust port installed inside.

According to an additional aspect of the present invention, an actuator for an exhaust gas recirculation valve having excellent response characteristics further includes an upper washer and a lower washer that are inserted and coupled to the fixed shaft at both ends of the rotor inserted into the fixed shaft.

In the present invention, the shaft, which is the rotation center of the motor used in the actuator for the exhaust gas recirculation valve, is implemented in a fixed type so that it does not rotate with the rotor to remove the bearing, and washers at both ends of the rotor ( Washer) can be used to reduce the inertia of the rotor so that it can be implemented to have excellent acceleration and deceleration functions, thereby improving response characteristics.

In addition, since the present invention does not use a bearing, it is possible to eliminate the assembly process of press-fitting the bearing and forcibly coupling the bearing, thereby simplifying the manufacturing process, thereby reducing the manufacturing cost.

1 is a cross-sectional view showing the configuration of an exemplary embodiment of an actuator for an exhaust gas recirculation valve having excellent response characteristics according to the present invention.
2 is a perspective view showing an embodiment of a housing of an actuator for an exhaust gas recirculation valve having excellent response characteristics according to the present invention.
3 is a side view and a plan view showing an embodiment of a rotor of an actuator for an exhaust gas recirculation valve having excellent response characteristics according to the present invention.

Hereinafter, the present invention will be described in detail so that those skilled in the art can easily understand and reproduce the present invention through preferred embodiments described with reference to the accompanying drawings. Although specific embodiments are illustrated in the drawings and related detailed descriptions are described, this is not intended to limit the various embodiments of the present invention to a specific form.

In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the embodiments of the present invention, the detailed description will be omitted.

When a component is referred to as being "connected" or "connected" to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. Should be.

On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle.

1 is a cross-sectional view showing the configuration of an embodiment of an actuator for an exhaust gas recirculation valve having excellent response characteristics according to the present invention, and FIGS. 2 and 3 are respectively a housing of an actuator for an exhaust gas recirculation valve having excellent response characteristics according to the present invention. And a diagram showing an embodiment of a rotor.

As shown in FIG. 1, the actuator 100 for exhaust gas recirculation valve having excellent response characteristics according to this embodiment includes a housing 110, a fixed shaft 120, a rotor 130, and a stator 140. ), an input-side worm gear 150a and an output-side worm gear 150b, an input-side movable portion 160a and an output-side movable portion 160b, and an intake port 170a and an exhaust port 170b.

The housing 110 includes a lower base body 110a and an upper cover 110b covering the lower base body 110a. In this case, the material of the lower base body 110a and the upper cover 110b may be a synthetic resin type such as plastic, but is not limited thereto.

As shown in FIG. 2, a stator 140 is disposed on the bottom of the lower base body 110a, and a fixed shaft 120 into which the rotor 130 is inserted is fixedly installed at the central portion of the stator 140. The shaft coupling part 111 is formed. For example, the shaft 120 may be fixed to the shaft coupler 111 using an adhesive or the like, but is not limited thereto.

The fixed shaft 120 is fixedly installed on the housing 110 so as not to rotate. In this case, the material of the fixed shaft 120 may be stainless steel having rigidity, but is not limited thereto.

For example, the shaft 120 may be coupled and fixed to the shaft coupling hole 111 formed in the center of the bottom of the lower base body 110a of the housing 110 so as not to rotate along the rotor 130.

The rotor 130 is inserted into the fixed shaft 120 and rotates with the fixed shaft as a central axis. For example, the rotor 130 is a cylindrical rotor core 131, a plurality of permanent magnets 132 installed on the outer periphery of the cylindrical rotor core, and the cylindrical rotor core and permanent magnets are molded to the outside. It may include a synthetic resin-based molding body 133 such as plastic to prevent exposure.

Meanwhile, as shown in FIG. 3, the molding body 133 may be implemented in a two-stage structure having a large lower diameter and a small diameter at the upper part, and a fixed shaft 120 at the center of the molding body 133 A through hole 134 for insertion may be formed, and a threaded portion 135 for driving the rotation of the worm gear may be formed on an outer edge of a portion having a small upper diameter of the molding body 133.

The stator 140 provides magnetic force that drives the rotor 130 to rotate. Although not specifically shown in the drawings, the stator 140 includes a stator core and a coil wound around teeth formed in the stator core, and the stator core and coil are composites such as plastic. It may be molded by a resin-based material.

for example. The stator 140 may be installed on the bottom of the lower base body 110a of the housing 110, and the central portion of the stator 140 has a circular opening 141 so that the rotor 130 can be installed. Can be.

The input-side worm gear 150a and the output-side worm gear 150b convert the rotational force of the rotor in a direction orthogonal to the direction in which the rotor 130 rotates. At this time, the input-side worm gear (150a) and the output-side worm gear (150b) are installed opposite to each other on the threaded portion 135 formed on the outer edge of the portion with a small upper diameter of the molding body 133, and rotated by interacting with the rotation of the threaded portion 135 Can be.

The input-side movable part 160a and the output-side movable part 160b are connected to each of the input-side worm gear 150a and the output-side worm gear 150b to input and output exhaust gas to circulate the exhaust gas. For example, at the ends of the input-side movable part 160a and the output-side movable part 160b, screw-type blades 161 for improving input and output of exhaust gas may be provided, respectively.

The intake port 170a and the exhaust port 170b are respectively formed on both sides of the housing 110, and an input side exhaust gas recirculation valve (not shown) and an output side exhaust gas recirculation valve (not shown) are respectively connected to intake or Exhaust, but each of the input-side movable portion (160a) and the output-side movable portion (160b) is installed. In this case, the intake port 170a and the exhaust port 170b may be formed to be deflected on both sides of the housing 110.

The operation of the actuator for exhaust gas recirculation valve configured as described above will be described. The rotor 130 is driven to rotate by the magnetic force generated by the stator 140. In this case, the output of the actuator for the exhaust gas recirculation valve may be accelerated or decelerated by increasing or decreasing the rotational speed of the rotor 130 by controlling the amount of current applied to the coil of the stator 140.

When the rotor 130 is rotationally driven, the rotational force of the rotor is converted in a direction orthogonal to the direction in which the rotor 130 rotates by the input side worm gear 150a and the output side worm gear 150b, and the input side movable part 160a And while the output-side movable part 160b rotates in a direction orthogonal to the direction in which the rotor 130 rotates, exhaust gas discharged from the combustion chamber (not shown) is sucked through the inlet 170a, and through the exhaust port 170b. It is exhausted and supplied to the combustion chamber.

At this time, an input side exhaust gas recirculation valve (not shown) and an output side exhaust gas recirculation valve (not shown) are connected between the intake port 170a and the combustion chamber and between the exhaust port 170b and the combustion chamber, respectively. Through this process, part of the exhaust gas discharged from the combustion chamber (not shown in the drawing) is supplied again to the combustion chamber.

In this process, the actuator for exhaust gas recirculation valve according to the present invention accelerates or decelerates the rotation speed of the rotor in response to acceleration and deceleration of the engine performed in real time. The inertia is minimized by using a fixed shaft and removing the bearing.

The present invention implements the shaft, which is the rotation center of the motor used in the actuator for the exhaust gas recirculation valve, in a fixed type so that it does not rotate with the rotor, compared to the prior art that employs a rotating shaft that rotates with the rotor. The weight of the rotor can be reduced, so the inertia of the rotor can be reduced.

In addition, since bearings are not used due to the adoption of the fixed shaft, the frictional force between the non-rotating fixed shaft and the rotating rotor is relatively large compared to the bearing interface friction force of the conventional bearing structure. It can be reduced by suppressing it.

Accordingly, it is possible to improve the acceleration and deceleration functions of the actuator for the exhaust gas recirculation valve, and thus the response characteristics of the actuator for the exhaust gas recirculation valve can be improved. In addition, since the present invention does not use a bearing by employing a fixed shaft, the assembly process of press-fitting and forcibly coupling the bearing can be eliminated, thereby simplifying the manufacturing process, thereby lowering the manufacturing cost.

Meanwhile, according to an additional aspect of the invention, the actuator 100 for an exhaust gas recirculation valve having excellent response characteristics may further include an upper washer 180a and a lower washer 180b.

The upper washer 180a and the lower washer 180b are inserted into and coupled to the fixed shaft at both ends of the rotor 130 inserted into the fixed shaft 120. Accordingly, the rotational force of the rotor 130 is supported by the upper washers 180a and the lower washers 180b installed at both ends of the rotor 130 inserted into the fixed shaft 120 instead of a bearing supporting the existing rotating shaft. Therefore, the inertia of the rotor can be suppressed and reduced by the interfacial frictional force of the upper washer 180a and the lower washer 180b.

When using the upper washer (180a) and the lower washer (180b) instead of the bearing, the output torque is determined according to the reduction ratio by the input-side worm gear (150a) and the output-side worm gear (150b). Since the acceleration and deceleration functions of the actuator can be improved, the response characteristics of the actuator for the exhaust gas recirculation valve can be improved.

In addition, since the present invention does not use a bearing by employing a fixed shaft, the assembly process of press-fitting and forcibly coupling the bearing can be eliminated, thereby simplifying the manufacturing process, thereby lowering the manufacturing cost.

The various embodiments disclosed in the present specification and drawings are only provided for specific examples to aid understanding, and are not intended to limit the scope of the various embodiments of the present invention.

Therefore, the scope of the various embodiments of the present invention is included in the scope of the various embodiments of the present invention in addition to the embodiments described herein, all changes or modified forms derived based on the technical idea of the various embodiments of the present invention. It should be interpreted as being.

The present invention can be used industrially in the field of exhaust gas recycling technology and its application technology.

100: actuator for exhaust gas recirculation valve
110: housing
110a: lower base body
110b: top cover
111: shaft coupling
120: fixed shaft
130: rotor
131: rotor core
132: permanent magnet
133: molding body
134: through hole
135: threaded portion
140: stator
141: opening
150a: input side worm gear
150b: worm gear on the output side
160a: input side movable part
160b: output side movable part
161: screw type wing
170a: intake port
170b: exhaust port
180a: upper washer
180b: lower washer

Claims (2)

A housing;
A fixed shaft fixedly installed in the housing so as not to rotate;
A rotor inserted into the fixed shaft and rotated around the fixed shaft;
A stator that provides a magnetic force that drives the rotor to rotate;
An input-side worm gear and an output-side worm gear for converting a rotational force of the rotor in a direction orthogonal to a direction in which the rotor rotates;
An input-side movable part and an output-side movable part connected to each of the input-side worm gear and the output-side worm gear to input and output exhaust gas to circulate the exhaust gas;
An intake port and an exhaust port respectively formed on both sides of the housing, each of which is connected to an input side exhaust gas recirculation valve and an output side exhaust gas recirculation valve to intake or exhaust exhaust gas, and each of an input side movable part and an output side movable part installed therein;
An upper washer and a lower washer inserted into and coupled to the fixed shaft at both ends of the rotor inserted into the fixed shaft;
Include,
Deceleration function by suppressing the inertia of the rotor, which acts as a factor that hinders the deceleration of the rotor by the interfacial friction between the fixed shaft and the rotor without bearings, and the interfacial friction between the both ends of the rotor and the upper and lower washers. Exhaust gas recirculation valve actuator with excellent response characteristics to improve delete

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