WO2011068267A1

WO2011068267A1 - Variable nozzle device of turbocharger

Info

Publication number: WO2011068267A1
Application number: PCT/KR2009/007240
Authority: WO
Inventors: 안재원; 강수영; 권성
Original assignee: (주)계양정밀
Priority date: 2009-12-04
Filing date: 2009-12-04
Publication date: 2011-06-09

Abstract

Disclosed is a variable nozzle device of a turbocharger, wherein assembly and workability are improved while a driving mechanism is simply composed. The variable nozzle device of a turbocharger according to the present invention comprises: a nozzle ring for rotatively supporting a rotation shaft which is connected with a vane for guiding exhaust gas introduced into a turbines side; a lever plate connected to the rotation shaft at one side for enabling the rotation shaft to rotate; a drive ring rotatively mounted in contact with the nozzle ring at one sides surface, supporting the other side of the lever plate for enabling the lever plate to rotate, and having at least one guide groove depressed by a predetermined depth in the inner surface which contacts the nozzle ring; and a guide member having a guide section formed on the nozzle ring and protruding for slideability along the guide groove, and a holding protrusion section for supporting the other sides surface of the drive ring to prevent the drive ring from deviating in the axial direction. Therefore, it is possible to limit the rotation path of the drive ring and the rotation angle of the vane and simultaneously prevent the deviation of the drive ring in the axial direction, by means of the guide groove and the guide member.

Description

Variable nozzle unit of turbocharger

The present invention relates to a variable nozzle device of a turbocharger, and more particularly, a guide member is mounted on a nozzle ring to prevent the drive ring from being separated and at the same time limit the rotational trajectory of the drive ring. Relates to a device.

A turbocharger is a device that rotates a turbine by using the energy of exhaust gas and pressurizes air by a compressor connected to the turbine. The turbocharger supplies pressurized air to the combustion chamber of the engine to improve the filling efficiency of the engine. To increase.

The turbocharger changes the energy that can be provided by the exhaust gas according to the operating state of the engine. Therefore, the turbine nozzle is varied so that the exhaust gas is applied to the turbine in order to adjust the amount appropriately according to the operating state of the engine to operate the engine more efficiently. It allows you to control the energy you provide. As a method of varying the turbine nozzle, a method of controlling the flow direction of the exhaust gas supplied to the turbine by rotating a plurality of vanes provided in the flow path through which the exhaust gas is supplied to the turbine is mainly used.

As shown in FIGS. 1 and 2, the variable nozzle device of the conventional turbocharger is rotatably installed in the nozzle ring 10 fixed to the housing 1 and supplied to the turbine 2. It is composed of a structure having a plurality of vanes (3) for controlling the flow rate of the gas. In addition, the drive ring 20 is formed concentrically with the nozzle ring 10 and is rotatably installed in the nozzle ring 10, and is integrally connected to the rotation shaft 30 of the vane 3 and the drive ring 20 is connected to the drive ring 20. It consists of a lever plate 40 extending toward.

The nozzle ring 10 has a ring shape in which a through hole 11 is formed at a central portion thereof, and a plurality of rotation shafts 30 are rotatably mounted. One end of the rotating shaft 30 is equipped with a vane 3 to adjust the amount of exhaust gas guided to the turbine (2). The lever plate 40 is fixed to the other end of the rotation shaft 30.

An end of the lever plate 40 extending toward the driving ring 20 is fitted between the driving protrusions 21 protruding from one side of the driving ring 20. The driving ring 20 is connected to an actuator which is externally mounted to generate the power necessary to rotate the vane 3.

A plurality of mount pins 50 are mounted on the nozzle ring 10 to prevent separation of the drive ring 20 rotatably mounted on one side of the nozzle ring 10. Mounting pin 50 has a locking step 51 having an extended cross section to prevent the drive ring 20 is separated in the axial direction in the middle portion.

If the vane 3 is rotated more than a certain angle while the variable nozzle device of the turbocharger configured as described above is operated, there is a risk of contact with the turbine 2, so to prevent the rotation angle of the vane 3 to be limited. There is a need. In order to limit the angle of rotation of the vane 3, a locking projection 31 protruding by a predetermined height is formed at one end of the lever plate 40. The locking protrusion 31 protrudes to a height capable of contacting the housing 1 portion fitted in the through hole 11 in a state where the vanes 3 are rotated as far as possible so as not to contact the turbine 2. The rotation angle of the vane 3 and the rotation angle of the driving ring 20 are limited by the rotation angle of the lever plate 40 by the locking protrusion 31.

In addition, at least one stopper 12 is mounted to the nozzle ring 10. The stopper 12 protrudes to a predetermined height so that the vane 3 is in contact with the lever plate 40 in a state in which it is rotated as far as possible so as not to contact the turbine 2 so that the lever plate 40 can no longer be rotated. It acts as a restraint. The lever plate 40 should have sufficient thickness and rigidity to be in contact with the stopper 12 and to withstand collisions.

As described above, the variable nozzle device of the turbocharger having the conventional structure requires a plurality of parts to prevent the driving ring 20 from being separated and limit the rotational trajectory of the driving ring 20 or the rotation angle of the vane 3. It is made of a complex structure that increases the manufacturing cost and there is a problem of poor assembly. In addition, since the lever plate 40 has an asymmetrical shape on the left and right with respect to the center line, it has a problem in assembling since assembly is inferior.

The object of the present invention devised in view of the above point is to prevent the detachment of the drive ring, the drive mechanism that can limit the rotational trajectory of the drive ring and the angle of rotation of the vane, while the assembly and operability An object of the present invention is to provide a variable nozzle device of a turbocharger that can be improved.

Still another object of the present invention is to provide a variable nozzle device of a turbocharger with improved assembly ability while reducing manufacturing cost by reducing the number of parts.

The variable nozzle device of the turbocharger for achieving the object of the present invention as described above comprises a nozzle ring for rotatably supporting a rotating shaft connected to the vane for guiding the exhaust gas flowing into the turbine side; A lever plate having one side connected to the pivot shaft to pivot the pivot shaft; At least one recessed side in contact with the nozzle ring and rotatably mounted, supporting the other side of the lever plate to rotate the lever plate, and recessed to a predetermined depth in an inner side in contact with the nozzle ring. A drive ring having a guide groove; And a guide member formed on the nozzle ring, the guide member protruding to slide along the guide groove, and a locking member supporting the other side of the driving ring to prevent the driving ring from being separated in the axial direction. It includes.

Further, the guide member may be protruded from the outer circumferential surface of the nozzle ring proximate to the inner surface of the driving ring to contact the guide groove, and the locking jaw portion bent at the end of the guide portion may drive the drive. It consists of guide protrusions supporting the other side of the ring.

In addition, more preferably, the guide member is made of a guide pin mounted along the edge of the nozzle ring.

In addition, more preferably, the guide pin is formed on one side of the guide portion protruding from the outer circumferential surface of the nozzle ring so as to contact the guide groove, the locking jaw having an extended cross section at the end of the guide portion Is provided.

In addition, more preferably, the guide portion further includes a friction reducing ring fitted to reduce the frictional force with the drive ring.

In addition, more preferably, the end of the guide portion is in contact with the guide groove so that the predetermined rotation is maintained between the inner surface of the drive ring and the outer circumferential surface of the nozzle ring proximate to the drive ring. .

In addition, more preferably, the guide groove is a guide surface to which the protruding end of the guide portion is in contact; And a stopping surface formed at both ends of the guide surface and connected to an inner surface of the driving ring.

In addition, more preferably, the stopping surface is formed in a shape corresponding to the shape of the outer circumferential surface of the guide portion to be in surface contact with the outer circumferential surface of the guide portion.

Further, more preferably, the stopping surface is a tapered inclined surface.

Also, more preferably, the lever plate is symmetrical with respect to the center line.

In addition, more preferably, the guide groove and the guide member are formed in pairs with each other.

As described above, the variable nozzle device of the turbocharger according to the present invention prevents the drive ring from being separated by the guide member and limits the rotation angle of the drive ring and the rotation angle of the vane, thereby simplifying the structure and reducing the number of parts, thereby reducing the manufacturing cost. It is effective.

In addition, the assembly process is simplified by reducing the number of parts, thereby improving assembly and productivity.

In addition, since the lever plate is symmetrical in shape, the lever plate can be assembled regardless of the direction, thereby improving workability.

In addition, a predetermined distance is maintained between the inner surface of the drive ring and the outer circumferential surface of the nozzle ring, and sliding is performed while the guide portion of the guide member is in contact with the guide groove, thereby reducing the frictional force, thereby improving operability.

1 is a cross-sectional view showing a turbocharger of the conventional structure of the present invention.

2 is a plan view illustrating a variable nozzle device of the turbocharger shown in FIG. 1;

3 is a plan view showing a variable nozzle device of a turbocharger as a first preferred embodiment of the present invention;

4 is a perspective view showing the guide member shown in FIG.

5 is a state diagram showing a state in which the driving is rotated to the stop position in one direction;

6 is a state diagram showing a state in which the drive is rotated to the stop position in the other direction,

FIG. 7 is a cross-sectional view of a section “A-A” shown in FIG. 5;

Figure 8 is a cross-sectional view showing a cross section of the guide pin mounting portion of the variable nozzle device according to a second embodiment of the present invention;

9 is a plan view showing a variable nozzle apparatus according to a third preferred embodiment of the present invention;

FIG. 10 is a cross-sectional view of the "B-B" portion shown in FIG. 9 in cross section;

11 is a plan view showing a variable nozzle apparatus according to a fourth preferred embodiment of the present invention.

Hereinafter, a variable nozzle device of a turbocharger according to an exemplary embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

2 to 7, the variable nozzle device of the turbocharger according to the first embodiment of the present invention is rotatably installed in the nozzle ring 110 fixed to the housing 1 to the turbine 2, respectively. It is composed of a structure having a plurality of vanes (3) for controlling the flow amount of the exhaust gas supplied. In addition, the drive ring 120 and the drive ring 120 is formed to be concentric with the nozzle ring 110 and rotatably installed in the nozzle ring 110 and the rotation shaft 30 of the vane 3, and the drive ring 120 It consists of a lever plate 140 extending toward.

The nozzle ring 110 has a ring shape in which a through hole 111 is formed in a central portion thereof, and a plurality of rotation shafts 30 are rotatably mounted. The vane 3 is mounted at one end of the rotation shaft 30 and the lever plate 140 is fixed at the other end. The lever plate 140 has a shape symmetrical with respect to the center line.

An end of the lever plate 140 extending toward the driving ring 120 is fitted between the driving protrusion 121 protruding from one side of the driving ring 120. The drive ring 120 is connected to an actuator which is externally mounted and generates power required to rotate the vanes 3.

A guide groove 122 recessed to a predetermined depth is formed in the inner surface 123 of the drive ring 120 which is in contact with the outer circumferential surface 112 of the nozzle ring 110, and a guide groove ( The guide pin 150 is mated with the guide member 122 is mounted.

The guide pin 150 has a cross section extending from the protruding end of the guide portion 151 and the guide portion 151 inserted into the mounting groove 110a formed along the edge of the nozzle ring 110 and the driving ring 120. It consists of a locking jaw portion 152 for supporting the other side. Although the guide pin 150 and the guide part 151 have been described as a columnar shape having a circular cross-sectional shape, the cross-sectional shape is not limited to a circular shape, but may be made of various rectangular cross-sectional shapes such as a triangular cross section or a square cross section. The guide part 151 is mounted to protrude from the outer circumferential surface 112 of the nozzle ring 110 through an opening portion of one side of the mounting groove 110a, and one side of the protruding guide part 151 is guide groove 122. Is in contact with. At this time, the protruding end of the guide part 151 may be guide grooves (not shown) between the inner surface 123 of the drive ring 120 and the outer circumferential surface 112 of the nozzle ring 110 to be rotated with a predetermined interval maintained. 122). Since only the protruding end of the guide portion 151 rotates in contact with the guide surface 122a of the guide groove 122, the frictional force is reduced, and the nozzle ring 110 is expanded even when the nozzle ring 110 is expanded by heat. The driving ring 120 can be prevented from being in close contact.

The guide groove 122 is formed at both ends of the guide surface 122a and the guide surface 122a to which the protruding end of the guide part 151 contacts, and is connected to the inner surface 123 of the driving ring 120. Consisting of a stopping surface 122b. The stopping surface 122b has a shape corresponding to the shape of the protruding outer circumferential surface of the guide part 151. That is, when the guide pin 150 and the guide portion 151 has a rectangular cross-sectional shape such as a triangular cross section or a square cross section, the guide pin 150 and the guide part 151 have a shape corresponding to the cross section. It is preferably made of an arc shape corresponding to the protruding outer peripheral surface shape of.

In addition, the guide grooves 122 and the guide pins 150 are formed to be paired with each other, three or more are formed at equal intervals based on the center point of the nozzle ring 110. As shown, it is preferably formed in three places at 120 degree intervals.

Operation of the variable nozzle device of the turbocharger of the first preferred embodiment of the present invention configured as described above is as follows.

As illustrated in FIG. 5, when the actuator is operated to rotate in the closing direction of the vane, when the driving ring 120 rotates as much as possible in one direction, the guide part 151 sliding along the guide surface 122a stops on one side. While contacting the surface (122b) is stopped so that the drive ring 120 is no longer rotated. On the contrary, as shown in FIG. 6, when the actuator is operated to rotate in the direction in which the vanes are opened, when the driving ring 120 rotates as far as possible in the opposite direction to the above, the guide part 151 sliding along the guide surface 122a is located at the other side. While contacting the stopping surface (122b) of the drive ring 120 is stopped so that it is no longer rotated. That is, since the rotational path of the driving ring 120 is limited by the guide part 151 sliding in contact with the guide groove 122, the vanes are out of the range of rotation and the peripheral parts, in particular, the turbine 2. It will not crash and cause damage.

In addition, as illustrated in FIG. 7, the guide part 151 of the guide pin 150 slides along the guide groove 122 to limit the rotational trajectory of the driving ring 120 and at the same time to catch the guide pin 150. The jaw portion 152 supports the other side of the drive ring 120 that rotates in a state in which one side is in contact with the nozzle ring 110 to prevent the drive ring 120 from being separated in the axial direction.

In addition, the guide groove 122 and the guide pin 150 as described above can be performed at the same time the function of the existing mount pin and the stopper, to form a symmetrical lever plate 140 on the basis of the center line It is possible. That is, the left and right symmetrical lever plate 140 can be assembled to the rotational shaft 30 regardless of the directionality when assembling, so assembling work becomes easier.

Similarly, the variable nozzle device of the turbocharger according to the second preferred embodiment of the present invention has a structure further including a friction reducing ring 153 for reducing friction in the guide part 151 of the guide pin 150 as shown in FIG. 8. Is made of. The friction reducing ring 153 is mounted on the point of contact with the guide surface 122a of the guide groove 122 to reduce the friction force. The friction reducing ring 153 is made of a plastic material and is rotatably mounted to the guide part 151. Or bearings. The configuration and operation process other than the structure in which the friction reducing ring 153 is mounted are the same as in the first preferred embodiment of the present invention.

Similarly, in the variable nozzle device of the turbocharger according to the third preferred embodiment of the present invention, as illustrated in FIGS. 9 and 10, the outer peripheral surface 112 of the nozzle ring 110 in which the guide member is close to the inner surface of the drive ring 120 is shown. Protruding to a predetermined height in the guide portion 251 and contact with the guide surface 122a of the guide groove 122, the hook is bent at the end of the guide portion 251 to support the other side of the driving ring 120 It is composed of a guide protrusion 250 consisting of a jaw 252. The rest of the configuration and operation process are the same as in the first preferred embodiment of the present invention.

Similarly, the variable nozzle device of the turbocharger according to the fourth preferred embodiment of the present invention is formed at both ends of the guide surface 122a constituting the guide groove 122 as shown in FIG. The stopping surface 122c connected to the 123 is formed as a tapered inclined surface. The stopping surface 122c is not limited to an acute angle with respect to the guide surface 122a, but may be formed at a right angle or an obtuse angle.

As described above, the variable nozzle device of the turbocharger according to the present invention slides in a state where the guide pin 150 or the guide protrusion 250 forming the guide member is in contact with the guide groove 122. By limiting the rotational trajectory and the angle of rotation of the vanes 3 and preventing the drive ring 120 from axially disengaging at the same time, the drive mechanism can be easily configured and the assemblability or operability can be improved. will be.

In addition, since the lever plate 140 does not collide with other components, it is not necessary to use an expensive material having high rigidity, and it is possible to reduce the thickness and miniaturize it.

Claims

A nozzle ring rotatably supporting a rotating shaft to which vanes for guiding exhaust gas flowing into the turbine side are connected;

A lever plate having one side connected to the pivot shaft to pivot the pivot shaft;

At least one recessed side in contact with the nozzle ring and rotatably mounted, supporting the other side of the lever plate to rotate the lever plate, and recessed to a predetermined depth in an inner side in contact with the nozzle ring. A drive ring having a guide groove; And

A guide member formed on the nozzle ring and including a guide part protruding to slide along the guide groove and a locking step part supporting the other side of the drive ring to prevent the drive ring from being axially separated; Variable nozzle device of a turbocharger comprising a.
The method of claim 1, wherein the guide member

The guide portion protrudes from the outer circumferential surface of the nozzle ring proximate to the inner surface of the driving ring and contacts the guide groove, and the locking jaw portion bent at the end of the guide portion comprises a guide protrusion for supporting the other side of the driving ring. Variable nozzle device of a turbocharger characterized in that.
The method of claim 1, wherein the guide member

Turbocharger variable nozzle device characterized in that consisting of a guide pin mounted along the edge of the nozzle ring.
The method of claim 3, wherein the guide pin

The guide portion protruding a predetermined portion from the outer circumferential surface of the nozzle ring so as to be in contact with the guide groove is formed on one side, the end of the guide portion is provided with the latching jaw having an extended cross section is variable of the turbocharger Nozzle unit.
The method of claim 4, wherein the guide portion

And a friction reducing ring fitted to reduce the frictional force with the drive ring.
According to claim 1, wherein the end of the guide portion is in contact with the guide groove so that it can be rotated while maintaining a predetermined interval between the inner surface of the drive ring and the outer peripheral surface of the nozzle ring close to the drive ring Turbocharger variable nozzle device characterized in that.
According to any one of claims 1 to 6, wherein the guide groove

A guide surface to which the protruding end of the guide portion contacts; And

Stopping surfaces formed on both ends of the guide surface and connected to the inner surface of the drive ring; Variable nozzle device of a turbocharger comprising a.
The method of claim 7, wherein the stopping surface is

Turbocharger variable nozzle device, characterized in that formed in a shape corresponding to the outer peripheral surface shape of the guide portion to be in surface contact with the outer peripheral surface of the guide portion.
The method of claim 7, wherein the stopping surface is

Turbocharger variable nozzle device characterized in that the tapered inclined surface.
The lever plate according to any one of claims 1 to 6, wherein the lever plate is

Variable nozzle device of the turbocharger characterized in that the left and right symmetry with respect to the center line.
The variable nozzle apparatus of claim 1, wherein the guide groove and the guide member are formed in pairs with each other.