WO2011096640A2

WO2011096640A2 - Turbocharger actuator

Info

Publication number: WO2011096640A2
Application number: PCT/KR2010/008785
Authority: WO
Inventors: 강지만; 최남선; 김차식
Original assignee: 주식회사 인팩
Priority date: 2010-02-05
Filing date: 2010-12-09
Publication date: 2011-08-11
Also published as: WO2011096640A3

Abstract

The present invention relates to a turbocharger actuator, which comprises: an actuator section provided with a piston rod that reciprocates according to an engine state; and a position sensor section for sensing the piston rod. The position sensor section includes: a cover body mounted at the upper portion of the actuator section; an insert body integrally formed into the cover body and formed with a through-hole; a shaft mounted into the though-hole to be able to reciprocate; a magnet provided in the shaft; and a terminal assembly having a hall sensor responding to the magnetic force of the magnet, wherein the actuator section is integrated into the lower side of the cover body. Therefore, the state of a turbocharger is detected by only the magnet and the hall sensor, so that it is possible to reduce manufacturing costs and a malfunction rate of a product via the simplification of components. In addition, the sensor section for detection is integrally over-molded into the components of a product, so that it is possible to prevent malfunction due to vibration or moisture inflow so as to improve durability.

Description

Turbocharger actuator

The present invention relates to a turbocharger actuator of an automobile, and more particularly to a turbocharger actuator having a position sensor unit for monitoring the state of the turbocharger.

In general, a turbocharger is a supercharger for improving engine performance by using exhaust gas generated from an internal combustion engine. A turbocharger is a device that increases the engine output by forcibly sending compressed air to a combustion chamber so that more fuel can be combusted. to be.

Such turbochargers are broadly classified into waste gate turbochargers (WGT) and variable geometry turbochargers (VGT), and recently, variable turbochargers have been widely applied.

This variable turbocharger changes the area of the turbine inlet by adjusting the vanes to maximize the amount of air in the low load region, which is lacking in the waste gate turbocharger. By maximizing, the exhaust gas is reduced by securing sufficient air amount while increasing the response in the low speed and low load region.

The variable turbocharger is largely composed of a compressor and a turbine, and further includes a flow passage adjusting mechanism for controlling the flow of exhaust gas therebetween.

The flow path adjusting mechanism is to improve the exhaust gas flow performance by adjusting the angular position of the vanes. The unison ring is installed inside the turbine housing and the turbine wheel and the equally spaced one side of the unison ring. Is a plurality of vanes and discs moving within a non-contact range, bushings and levers for operating the vanes and discs, and actuators connected to the levers using rods and operated by vacuum pressure provided by the vacuum pump of the engine. It consists of.

The vane is a structure in which the whole is integrally connected, and this integrated bale connection structure is called a cartridge, and the position of the actuator rod, the lever connected thereto, and the entire vane can be controlled by the control of the actuator.

It is an object of the present invention to monitor the condition of the turbocharger actuator to improve the efficiency of the turbocharger and to prevent unnecessary engine operation, thereby improving fuel economy and reducing the emission of air pollutants. It is to provide an actuator of a turbocharger that can realize cost reduction by simplifying the components.

In addition, another object of the present invention is to provide an actuator of a turbocharger which can improve the operability of the actuator by adding a component to the insert body of the actuator to facilitate the reciprocating motion of the shaft.

The present invention for achieving the above object, the actuator unit having a piston rod reciprocating according to the engine state; And a position sensor unit for sensing the piston rod, wherein the position sensor unit is mounted on an upper side of the actuator unit, an insert body integrally formed in the cover body and formed with a through hole, and in the through hole. And a terminal assembly having a shaft installed to reciprocate, a magnet provided inside the shaft, and a hall sensor responsive to the magnetic force of the magnet, wherein the actuator portion is integrally formed under the cover body. It is characterized in that the configuration.

The position sensor unit may further include a friction reducing unit provided in the insert body to reduce friction generated between the inside of the insert body and the shaft during the reciprocating motion of the shaft.

The friction reducing part is composed of a bearing provided in the through hole of the insert body.

The bearing is integrally formed with the insert body by insert molding during the injection molding of the insert body.

The insert body and the shaft are provided with a guide for guiding the shaft to prevent the shaft from being eccentric in the through hole.

The guide part includes one or more guide ribs formed on a protrusion formed at a predetermined height on an outer circumference of the shaft, and one or more guide grooves corresponding to the guide ribs and formed on an inner circumference of the through hole.

The terminal assembly includes a lead frame, a terminal fixed to an upper end of the lead frame, and a hall sensor fixed to a lower end of the lead frame, wherein the terminal assembly is integrally formed during injection molding of the insert body. do.

The terminal assembly further includes a protective cap inserted into the hall sensor to protect the terminal assembly when the terminal assembly is injection molded integrally with the insert body.

When the terminal assembly is integrally formed on the insert body, an exposed part is formed on the insert body, and the hall sensor is protruded to the exposed part, and a protective cap is fitted to the hall sensor.

The protective cap is composed of epoxy (EPOSY) or ABS resin.

A coupling groove is formed at one side of the through hole of the insert body, and the terminal assembly is fitted into the coupling groove.

1 is a cross-sectional view showing a turbocharger actuator according to the present invention.

Figure 2 is a cross-sectional view showing a sensor portion of the turbocharger actuator according to the present invention.

Figure 3 is a cross-sectional view showing a coupling state of the insert body and the shaft of the turbocharger actuator according to the first embodiment of the present invention.

4 is a perspective view showing a terminal assembly provided with a protection unit in the turbocharger actuator according to the first embodiment of the present invention.

5 is a detailed view of portion A of FIG. 3;

Figure 6 is a perspective view showing an example of the friction reducing unit in the turbocharger actuator according to the first embodiment of the present invention.

Figure 7 is an exploded perspective view showing a guide portion of the turbocharger actuator according to the first embodiment of the present invention.

8 is a cross-sectional view illustrating a hall sensor structure of a terminal assembly in a turbocharger actuator according to a second exemplary embodiment of the present invention.

Figure 9 is an exploded cross-sectional view showing a fixing structure of the terminal assembly in the turbocharger actuator according to a third embodiment of the present invention.

10 is an exploded perspective view of FIG. 9;

* Explanation of Codes *

100: actuator portion 101: piston rod

200: position sensor unit 210: cover body

220: insert body 221: through hole

224: exposed portion 230: shaft

240: terminal assembly 241: lead frame

242: terminal 243: hall sensor

270: magnet 280: cap member

290: spring 300: protective cap

400: friction reduction portion 500: guide portion

510: guide rib 520: guide groove

610: insert body 611: through hole

612: coupling groove 614: fixing groove

620: cap member 621: protective protrusion

Hereinafter, a turbocharger actuator according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view showing a turbocharger actuator according to an embodiment of the present invention, Figure 2 is a cross-sectional view showing a sensor portion of a turbocharger actuator according to an embodiment of the present invention.

As shown, the turbocharger actuator according to the embodiment of the present invention is provided in the position sensor unit 200 for monitoring the state of the turbocharger, and the position preliminary portion 200 in accordance with the state of the vehicle and engine The piston rod 101 is composed of an actuator part 100 provided to reciprocate.

As shown in FIG. 2, the position sensor unit 200 includes a cover body 210 mounted on an upper side of the actuator unit 100, an insert body 220 provided inside the cover body 210, and A shaft 230 provided reciprocally in the insert body 220, a terminal assembly 240 provided at one side of the insert body 220, and a magnet 270 provided at an inner center of the shaft 230. ), And a cap member 280 fixed to the top of the shaft 230 is configured.

The insert body 220 has a through hole 221 for reciprocating the shaft 230. A hole sensor 243 reacts with the magnetism of the magnet 270 at one side of the through hole 221. The terminal assembly 240 is injection molded integrally with the insert body 220.

The terminal assembly 240 includes a lead frame 241, a terminal 242 fixed to the upper end of the lead frame 241, and a hall sensor 243 fixed to the lower end of the lead frame 241.

Before the terminal assembly 240 is integrally molded to the insert body 220, the terminal assembly 240 fixes the terminal 242 and the hall sensor 243 to the upper and lower ends of the lead frame 241, respectively.

On the other hand, when the terminal assembly 240 is injection molded integrally with the insert body 220, a protection unit for protecting the Hall sensor 243 is further provided.

When the protective part is integrally molded with the insert body 220, the protection unit does not directly affect the high temperature of the hall sensor 243 during injection molding, so that the inherent function of the hall sensor 243 is improved. It is to prevent the loss. That is, the Hall sensor 243 is in response to the magnetism of the magnet 270 formed inside the shaft 230 so that the position sensor unit 200 can be operated smoothly.

The protective part is composed of a protective cap 300 that is fitted from the lower side of the hall sensor 243. The protective cap 300 is formed by penetrating the upper and lower portions, is inserted from the lower side of the hall sensor 243 is a part of the lower end of the hall sensor 243 protrudes to the lower side of the protective cap 300.

Here, the protective cap 300 is formed of epoxy (EPOXY), ABS resin, or the like, which has heat resistance and low thermal conductivity, in order to prevent loss of the function of the hall sensor 243 due to high temperature during injection molding.

The shaft 230 is interlocked with the drive of the piston rod 101 of the actuator unit 100, the magnet 270 is formed integrally by insert injection molding therein.

In addition, since the position sensor unit 200 is a component related to the engine, there is a high risk of burnout due to heat, and thus, the hall sensor 243, the magnet 270, and the cover body 210 constituting the position sensor unit 200. Care must be taken in the selection of materials such as the insert body 220.

The magnet 270 is made of ferrite, neodium, cobalt, alnico, and the like, and has a small change in magnetic flux depending on temperature, a high magnetic flux density, and an alnico having a high hardness. Use a series of magnets.

The insert body 220 and the shaft 230 are made of PPS (Poly Pheylene Sulfide) or epoxy. Here, PPS is also referred to as a super plastic that is spotlighted as a next-generation material to replace metals due to its heat resistance and durability as a thermoplastic resin.

The position sensor unit 200 further includes a spring 290 for returning to the original state after the shaft 230 is raised from the through hole 221. The spring 290 is configured to be elastically supported by the cap member 280 and the protrusion 231 protruding from the outer circumference of the shaft 230 by being fitted to the outer circumference of the shaft 230. In addition, a lower end of the through hole 221 may be provided with a locking portion that prevents the shaft 230 from being separated from the through hole 221 by the elastic force of the spring 290 in the through hole 221.

Here, the spring 290 is to ensure the allowable stress and the coil strength through the selection of a suitable spring constant and material to allow the operation to limit the maximum movement stroke of the shaft 230.

In addition, the Hall sensor 243 is a device that requires programming to output a linear output.

The magnet 270 is firmly fixed in the shaft 230 in consideration of the sensing area and sensitivity of the Hall sensor 243 during insert injection molding, and after the magnet 270 is fixed to the shaft 230, There is almost no.

When the Hall sensor 243 is fixed to the lead frame 241 of the terminal assembly 240, the hole sensor 243 is fixed in a spot welding manner in consideration of the sensing range of the Hall sensor 243 and the polarity of the magnet 270.

Meanwhile, as illustrated in FIG. 3, the through hole 221 of the insert body 220 is in contact with the inner circumferential surface of the through hole 221 during reciprocating movement of the shaft 230 to prevent friction, thereby smoothly reciprocating. A friction reducing portion 400 is provided.

As shown in FIG. 5, the friction reducing part 400 includes a bearing fixed to an inner circumference of the through hole 221. The bearing is integrally molded to the insert body by insert molding during the molding of the insert body 220.

As shown in FIG. 6, the bearing may be configured as a ball bearing or a roller bearing, and any bearing may be applied as long as the shaft 230 is smoothly reciprocated in the through hole 221.

In addition, the bearing is provided on the inner periphery of the lower end of the through hole 221 and is configured to perform a role of a catching part that prevents the shaft 230 from being separated from the through hole 221 by being caught by the protrusion 231 of the shaft 230. It becomes.

As illustrated in FIG. 7, the insert body 220 and the shaft 230 may include guide parts for guiding the shaft 230 when the shaft 230 reciprocates in the through hole 221 to prevent eccentricity. 500 is provided.

The guide part 500 corresponds to the shape of the one or more guide ribs 510 and the guide ribs 510 formed on the outer circumference of the protrusion 231 formed at a predetermined height on the outer circumference of the shaft 230 and the through hole ( The guide groove 520 is formed on the inner circumference of the 221.

The shaft 230 has a lower end connected to the piston rod 101 of the actuator unit 100, and the through hole 221 of the insert body 220 by the piston rod 101 reciprocated according to the engine state. It will be reciprocated from.

As shown, the turbocharger actuator according to the second embodiment of the present invention, the terminal assembly 240 is integrally molded to the insert body 220 during the injection molding of the insert body 220, the terminal assembly 240 An exposed portion 224 protruding from the hall sensor 243 is formed, and a separate cap member 300 is fitted to the hall sensor 243 protruding from the exposed portion 224.

That is, after the injection molding of the insert body 220, the Hall sensor 243 is formed in a state protruding to the exposed portion 224, the cap member 300 is provided separately in the Hall sensor 243 is inserted into the It is configured to protect the hall sensor 243 from high temperatures during injection molding of the cover body 210.

The rest of the configuration of the second embodiment is the same as that of the first embodiment, and the same reference numerals are assigned to the same components as the first embodiment, and detailed description thereof will be omitted.

9 and 10 are an exploded cross-sectional view and a perspective view showing the fixing structure of the terminal assembly in the turbocharger actuator according to the third embodiment of the present invention.

As shown, the turbocharger actuator according to the third embodiment of the present invention forms a coupling groove 612 in the insert body 610, and after fitting the terminal assembly 240 to the coupling groove 612 The cap member 620 is coupled to the upper portion of the through hole 611 of the insert body 610.

The upper side of the through-hole 611 of the insert body 610, when the terminal assembly 240 is fitted into the coupling groove 612, a fixing groove 614 is formed is the terminal 242 is seated. In addition, a protective protrusion 621 formed in the cap member 620 is fixed to the fixing groove 614 to cover and protect the terminal 242.

The rest of the configuration of the third embodiment is the same as that of the first embodiment, so that the same components as in the first embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted.

Hereinafter, an operation relationship of the position sensor unit of the turbocharger actuator according to the embodiment of the present invention having the above configuration will be described.

When the vehicle is traveling at high speed, the piston rod 101 of the actuator unit 100 moves downward, and at the same time, the shaft 230 of the position sensor unit 200 is lowered together with the spring 290 by the piston rod 101. Will be moved to.

At this time, the hall sensor 243 welded to the lead frame 241 of the terminal assembly 240 detects a change in the magnetic force according to the position change of the magnet 270 to detect the change value of the magnetic force through the terminal 242. Output

In addition, when the vehicle is traveling at a low speed, the piston rod 101 of the actuator unit 100 moves upward, and at the same time, the shaft 230 of the position sensor unit 200 moves upward in association with the piston rod 101.

At this time, the Hall sensor 243 of the position sensor unit 200 detects a change in the magnetic force according to the position change of the magnet 270 and outputs a change value of the magnetic force through the terminal 241.

According to the present invention, since the configuration for detecting the turbocharger is composed only of the magnet and the hall sensor, there is an effect that can reduce the manufacturing cost and the malfunction rate of the product by simplifying the components.

In addition, since the sensor unit for detection is integrally overmolded in the component parts of the product, it is possible to prevent malfunction due to vibration or moisture inflow and to improve durability.

In addition, by forming the Hall sensor constituting the position sensor unit integrally to the component parts with a protective cap when molding, it prevents the sensor from losing its function due to high temperature during injection molding, thereby improving the performance of the product. It has an effect.

In addition, by separately combining the terminal assembly having a Hall sensor among the components of the position sensor unit to the component, it is possible to prevent the sensor unit from losing its function during injection molding, thereby improving the performance of the product.

Claims

An actuator unit having a piston rod reciprocating according to an engine state;

Including a position sensor for sensing the piston rod,

The position sensor unit and the cover body mounted on the upper side of the actuator unit;

An insert body formed integrally with the cover body and having a through hole formed therein;

A shaft installed in the through hole so as to be reciprocated;

A magnet provided inside the shaft,

It comprises a terminal assembly having a Hall sensor in response to the magnetic force of the magnet,

Turbocharger actuator, characterized in that the actuator unit is integrally formed on the lower side of the cover body.
The method according to claim 1,

The position sensor unit may further include a friction reducing unit provided in the insert body to reduce friction generated between the inner side of the insert body and the shaft during the reciprocating movement of the shaft.
The method according to claim 2,

The friction reducing unit is a turbocharger actuator, characterized in that the bearing provided in the through-hole of the insert body.
The method according to claim 3,

The bearing is a turbocharger actuator, characterized in that integrally configured to the insert body by insert molding during the injection molding of the insert body.
The method according to claim 1,

The insert body and the shaft is a turbocharger actuator, characterized in that the guide portion for guiding to prevent the eccentricity when the shaft reciprocates in the through hole.
The method according to claim 5,

The guide portion and one or more guide ribs formed on the protrusion formed at a predetermined height on the outer circumference of the shaft,

And at least one guide groove corresponding to the guide rib and formed in the inner circumference of the through hole.
The method according to claim 1,

The terminal assembly includes a lead frame, a terminal fixed to an upper end of the lead frame, and a hall sensor fixed to a lower end of the lead frame.

The terminal assembly may be integrally molded during injection molding of the insert body.
The method of claim 7, wherein

The terminal assembly may further include a protective cap fitted to the hall sensor to protect the terminal assembly when the terminal assembly is injection molded integrally with the insert body.
The method of claim 7, wherein

When the terminal assembly is integrally formed on the insert body, an exposed part is formed in the insert body, and the hall sensor is formed to protrude into the exposed part.

Turbocharger actuator, characterized in that the protective cap is fitted to the Hall sensor.
The method according to claim 8 or 9,

The protective cap is a turbocharger, characterized in that consisting of epoxy (EPOSY) or ABS resin.
The method according to claim 1,

A coupling groove is formed at one side of the through hole of the insert body, and the terminal assembly is inserted into and coupled to the coupling groove.