JP6136458B2 - Compressor impeller assembly method and supercharger - Google Patents

Description

The present invention relates to a method for assembling a compressor impeller and a supercharger .

  A turbocharger used in an internal combustion engine has a structure in which a compressor impeller and a turbine impeller are coaxially connected. The turbine impeller is rotationally driven by exhaust gas from the internal combustion engine, and the compressor impeller compresses air by the rotational drive. The compressed air is supplied to the internal combustion engine. The compressor impeller is usually formed separately from the shaft and the turbine impeller, and is assembled to the shaft when the supercharger is assembled.

  As a method for assembling the compressor impeller, for example, there are a through-hole method and a direct screw fastening method. The through hole method is a method in which a through hole is formed in the center of the compressor impeller, a shaft is passed therethrough, and a nut is attached to the end of the shaft at the tip of the compressor impeller and tightened. The direct screw fastening method is a method in which a screw hole is provided on the back side of the compressor impeller, and a screwed shaft end is screwed into the screw impeller to be screwed together (for example, see Patent Document 1).

JP 2009-174358 A

  In the supercharger, in order to suppress vibrations and smoothly rotate the compressor impeller, before assembling, the compressor impeller is assembled with the shaft in advance and rotated, and the balance of the rotation center (center of gravity) is adjusted. When assembling the supercharger, the compressor impeller is once removed from the shaft, and the compressor impeller is assembled again after passing the shaft through the bearing housing.

  The balance adjustment is performed so that the unbalance amount of the rotating body is within a specified value when the compressor impeller is assembled to the shaft at a specific phase (posture). The balance adjustment is performed by scraping a part of the impeller or adding an object for balance adjustment. However, in the case of the through type, since the torque at the time of driving the compressor impeller is received by the friction of the nut, slippage may occur during operation, the phase of the compressor impeller may change, and the balance may be lost. Also, in the case of the direct screw fastening method, since the lead is short if it is a normal single thread screw, slipping may occur when torque is applied, the phase of the compressor impeller may change, and the balance may be lost.

The present invention has been made in view of the above problems, and an object thereof is to provide a compressor impeller assembling method and a supercharger capable of suppressing the occurrence of slipping and assembling the compressor impeller on a shaft with a specific phase. To do.

In order to solve the above problems, the present invention is a method for assembling a compressor impeller in which a male screw portion provided at one end of a shaft is screwed into a female screw portion provided on the back side of a compressor impeller and screwed. The male screw portion and the female screw portion are multi-threaded screws, and a first step of marking at a position other than the rotation center of the shaft and the compressor impeller, a first marker marked on the shaft, and the compressor impeller And a second step of adjusting the phase in the rotational direction of the shaft and the compressor impeller based on the second marker marked on the head.
By adopting this method, in the present invention, multiple threads are used in the direct screw fastening system, and the number of leads per rotation is increased. Thereby, in this invention, when torque is applied and the phase of a compressor impeller shifts | deviates, big tightening torque is needed and generation | occurrence | production of the slip of a compressor impeller can be suppressed. When a multi-thread screw is used, the shaft can be screwed into the compressor impeller at a plurality of phases. Therefore, in the present invention, markings are made in advance at positions other than the rotation center of the shaft and the compressor impeller. Thereby, in this invention, since it becomes possible to judge whether this marking was used as a mark and it was assembled in the wrong phase, a compressor impeller can be assembled to a shaft with a specific phase.

In the present invention, a turbine impeller is integrally provided at the other end portion of the shaft, and in the first step, a method of marking at a position other than the rotation center of the turbine impeller is adopted. .
By adopting this method, in the present invention, the turbine impeller provided integrally with the other end of the shaft is exposed to the outside and visible even when the shaft is passed through the bearing housing. By marking, the phase alignment in the second step can be easily performed.

In the present invention, the first step employs a technique in which the shaft and the compressor impeller are screwed together and the marking is performed in a state where the balance of the rotation center is adjusted.
By adopting this method, in the present invention, since marking is performed with the balance of the rotation center adjusted, the marking is used when the compressor impeller is once removed and reassembled through the shaft to the bearing housing. Thus, the compressor impeller can be assembled to the shaft at a specific phase after the balance adjustment.

In the present invention, the second step employs a technique in which the screwing is started with a posture in which a phase difference of the second marker is 180 degrees with respect to the first marker with respect to the rotation center. To do.
By adopting this method, in the present invention, the posture when starting screwing is set so that the first marker and the second marker are in opposite phases (phase difference 180 degrees). This makes it easy to understand whether to start the assembly of the compressor impeller in the posture, and prevents assembly errors due to the use of multiple threads.

Moreover, in this invention, the method that the said multi-thread screw is a triple thread is employ | adopted.
By adopting this method, in the present invention, by using a three-thread screw that can be assembled at a phase of every 120 degrees, the assembly when the attitude of the compressor impeller at the start of screwing is reversed upside down is used. Can be made impossible and assembly errors due to the use of multi-thread screws can be prevented.

In the present invention, the second step employs a technique of positioning the compressor impeller with respect to the shaft in the radial direction using a cylindrical jig when the screwing is started.
By adopting this method, in the present invention, a cylindrical jig is used when screwing is started, so that the shafts and the cores of the compressor impeller are aligned, and the compressor impellers are parallel to each other without being inclined. Can be assembled.

  According to the present invention, the occurrence of slip can be suppressed, and the compressor impeller can be assembled to the shaft at a specific phase.

1 is an overall configuration diagram of a supercharger in an embodiment of the present invention. It is a figure which shows the 1st marker and 2nd marker in embodiment of this invention. It is a flowchart of the assembly method of the compressor impeller in embodiment of this invention. It is a figure which shows the phase when attaching a compressor impeller to the shaft in embodiment of this invention. It is a figure which shows a phase when the compressor impeller is assembled | attached to the shaft in embodiment of this invention. It is a perspective view of the jig | tool in another embodiment of this invention. It is sectional drawing of the jig | tool in another embodiment of this invention. It is a perspective view of the jig | tool in another embodiment of this invention. It is sectional drawing of the jig | tool in another embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an overall configuration diagram of a supercharger 1 according to an embodiment of the present invention.
The supercharger 1 receives a turbine 2 that receives exhaust gas exhausted from an internal combustion engine or the like, obtains rotational power, a shaft portion 3 that transmits rotational power obtained by the turbine 2, and a rotation transmitted from the shaft portion 3. And a compressor 4 that compresses air by power.

  The turbine 2 includes a turbine housing 2a and a turbine impeller 2b. The turbine housing 2a is a container that houses the turbine impeller 2b and includes exhaust gas passages (the scroll passage 2c and the exhaust passage 2d) that are connected to the accommodation space of the turbine impeller 2b. The turbine impeller 2b is a radial impeller that is driven to rotate by receiving the exhaust gas flowing from the scroll passage 2c to the exhaust passage 2d.

  The shaft portion 3 includes a bearing housing 3a, a bearing 3b, and a shaft 3c. The bearing housing 3a is a container that accommodates the bearing 3b and the shaft 3c, and is fixed to the turbine housing 2a. The bearing 3b is accommodated in the bearing housing 3a and rotatably supports the shaft 3c. One end of the shaft 3 c is connected to the turbine impeller 2 b and the other end is connected to a compressor impeller 4 b described later of the compressor 4.

  The compressor 4 includes a compressor housing 4a and a compressor impeller 4b. The compressor housing 4a is a container that accommodates the compressor impeller 4b and includes an air flow path (intake flow path 4c and scroll flow path 4d) connected to the accommodation space of the compressor impeller 4b. The compressor impeller 4b is a radial impeller that is rotationally driven by the rotational power transmitted through the shaft 3c, compresses the air supplied from the intake passage 4c, and discharges the compressed air to the scroll passage 4d.

  In the supercharger 1 configured as described above, when exhaust gas is introduced from the internal combustion engine into the scroll flow path 2c, the exhaust gas is supplied to the turbine impeller 2b. By supplying the exhaust gas, the turbine impeller 2b, the shaft 3c, and the compressor impeller 4b rotate together. Thereby, rotational power is obtained in the turbine 2, and this rotational power is transmitted to the compressor 4 via the shaft portion 3, and compressed air is generated in the compressor 4.

  Next, the assembly structure of the compressor impeller 4b will be described.

  The compressor impeller 4b has a female screw part 4b1. The female screw portion 4b1 is provided at the center on the back side of the compressor impeller 4b. The compressor impeller 4b has a solid structure in which the female screw portion 4b1 does not penetrate. On the other hand, the shaft 3c has a male screw portion 3c1. The male screw portion 3c1 is provided at one end of the shaft 3c. Thus, in the present embodiment, a direct screw fastening method is employed in which the male screw portion 3c1 of the shaft 3c is screwed into the female screw portion 4b1 provided on the back side of the compressor impeller 4b and screwed.

  The male screw portion 3c1 and the female screw portion 4b1 are multi-threaded screws. Specifically, in this embodiment, it is a triple thread. In addition, as a multi-thread screw, it is good also as not only a 3-thread screw but a 2-thread screw, a 4-thread screw, or more multi-thread screws. However, when the number of screws is 5 or more, it is difficult to assemble the compressor impeller 4b because an assembly error is likely to occur due to an increase in the phase that can be assembled. Therefore, it is preferable to select in the range of 2 threads to 4 threads.

  A turbine impeller 2b is provided at the other end of the shaft 3c. The turbine impeller 2b is integrally formed at the other end of the shaft 3c, and has an integral structure with the shaft 3c. The compressor impeller 4b is formed with a hole 4b2 for an impeller assembling jig. The balance adjustment is performed by rotating the compressor impeller 4b at one end of the shaft 3c and cutting off a part of the compressor impeller 4b so as not to generate vibration or the like due to the deviation of the center of gravity. Is performed by making a hole in another part and embedding a metal material having a large specific gravity.

FIG. 2 is a diagram showing the first marker 10 and the second marker 20 in the embodiment of the present invention. 2A corresponds to the view X1 in FIG. 1, and FIG. 2B corresponds to the view X2 in FIG.
As shown to Fig.2 (a), the 1st marker 10 is formed in the front-end | tip of the turbine impeller 2b. The first marker 10 is formed in a straight line along a radius with the rotation center C as a reference.

In addition, as shown in FIG. 2B, a second marker 20 is formed at the tip of the compressor impeller 4b. The second marker 20 is also formed in a straight line along a radius with the rotation center C as a reference.
The first marker 10 and the second marker 20 are formed by a marking line, a marking pen, other marking means, or a combination thereof (for example, a combination of a marking line and a marking pen).

  Next, a method for assembling the compressor impeller 4b will be described.

FIG. 3 is a flowchart of a method for assembling the compressor impeller 4b in the embodiment of the present invention.
As shown in FIG. 3, the present method includes a first step (step S1 to step S3) for marking the shaft 3c (the turbine impeller 2b is an integral structure) and the compressor impeller 4b, and the marked first marker 10 and second mark. Based on the marker 20, the 2nd process (step S6-step S8) which adjusts the phase of the rotation direction of the compressor impeller 4b and the shaft 3c is included.

In this method, first, in order to adjust the balance, the male screw portion 3c1 of the shaft 3c is screwed into the female screw portion 4b1 of the compressor impeller 4b and screwed (step S1).
In step S1, the first marker 10 and the second marker 20 are not formed. When multiple threads are used as in this method, the shaft 3c can be screwed into the compressor impeller 4b in a plurality of phases. However, in this step S1, an arbitrary phase can be used without considering a specific phase. The shaft 3c and the compressor impeller 4b are screwed together.

Next, in this method, the balance of the rotation center C is adjusted in a state where the shaft 3c and the compressor impeller 4b are screw-coupled (step S2).
In step S2, the rotating body in which the shaft 3c and the compressor impeller 4b are screw-connected is set in a rotating device for balance adjustment, and data is acquired by rotation, so that vibration or the like does not occur due to a shift in the center of gravity. The position of the center of gravity is adjusted by cutting off a part of the impeller 4b. Thereby, the center of gravity of the compressor impeller 4b coincides with the rotation center C of the shaft 3c.

Next, in this method, marking is performed in a state where the shaft 3c and the compressor impeller 4b are screwed together and the balance of the rotation center C is adjusted (step S3).
In step S3, since the marking is performed in a state where the balance of the rotation center C is adjusted, as described later, when the compressor impeller 4b is once removed and then reassembled through the shaft 3c to the bearing housing, the marking is used as a mark. As a result, the compressor impeller 4b can be assembled to the shaft 3c at a specific phase where the balance is adjusted.

  In step S3, as shown in FIG. 2A, the first marker 10 is formed at a position other than the rotation center C of the turbine impeller 2b, and as shown in FIG. 2B, the compressor impeller 4b The second marker 20 is formed at a position other than the rotation center C (in phase with the first marker 10). The first marker 10 may be provided not on the turbine impeller 2b but on the shaft 3c. However, since the shaft 3c is inserted into the bearing housing 3a and there are few portions exposed to the outside when the compressor impeller 4b is assembled, as shown in FIG. 2A, the shaft 3c is provided on the turbine impeller 2b. Is preferred.

Next, in this method, in order to assemble the rotating body whose balance has been adjusted to the actual machine, the screw connection between the shaft 3c and the compressor impeller 4b is released, and the compressor impeller 4b is removed (step S4).
Next, in this method, as shown in FIG. 4B described later, the shaft 3c is inserted into the bearing housing 3a (step S5).

FIG. 4 is a diagram showing a phase when the compressor impeller 4b is assembled to the shaft 3c in the embodiment of the present invention. 4A corresponds to the arrow Y1 diagram in FIG. 4B, and FIG. 4C corresponds to the arrow Y2 diagram in FIG. 4B. FIG. 4B shows an overall view when the compressor impeller 4b is assembled to the shaft 3c.
In this method, after inserting the shaft 3c into the bearing housing 3a, the attitude of the compressor impeller 4b with respect to the shaft 3c when starting screwing is adjusted (step S6).

  In step S6, as shown in FIGS. 4 (a) and 4 (c), the first marker 10 is screwed in such a posture that the phase difference of the second marker 20 is 180 degrees around the rotation center C. Let it start. As described above, in this method, the posture when starting screwing is set so that the first marker 10 and the second marker 20 are in opposite phases (phase difference 180 degrees), so that the operator can be in any posture. It is easy to understand whether to start the assembly of the compressor impeller 4b, and an assembly error caused by using a multi-thread screw is prevented.

  The posture of the compressor impeller 4b when starting screwing can be set by adjusting the length of the multi-threaded screw when forming the male screw portion 3c1 and the female screw portion 4b1. Here, the multi-thread is a triple thread that can be assembled at a phase of every 120 degrees. The three-thread screw is not assembled when the posture of the compressor impeller 4b is upside down like the two-thread screw (phase every 180 degrees) or the four thread screw (phase every 90 degrees). In this method, the use of these three-thread screws is used to prevent assembly errors.

Next, in this method, in order to assemble the actual machine, the male screw portion 3c1 of the shaft 3c is screwed into the female screw portion 4b1 of the compressor impeller 4b and screwed (step S7).
In step S7, the first marker 10 and the second marker 20 are formed. The first marker 10 is formed on the turbine impeller 2b. As shown in FIG. 4B, the turbine impeller 2b provided integrally with the other end of the shaft 3c is exposed to the outside and visible even when the shaft 3c is passed through the bearing housing. For this reason, in step S3, the turbine impeller 2b is marked, whereby phase alignment in step S6 and step S8 described later can be easily performed.

FIG. 5 is a diagram showing a phase when the compressor impeller 4b is assembled to the shaft 3c in the embodiment of the present invention. 5A corresponds to the arrow Z1 diagram in FIG. 5B, and FIG. 5C corresponds to the arrow Z2 diagram in FIG. 5B. FIG. 5B shows an overall view when the compressor impeller 4b is assembled to the shaft 3c.
In this method, the phase of the assembled compressor impeller 4b is confirmed based on the first marker 10 and the second marker 20 (step S8).

  In step S8, as shown in FIGS. 5 (a) and 5 (c), it is confirmed whether the compressor impeller 4b is assembled in a posture in which the first marker 10 and the second marker 20 are in phase. In this method, by using multiple threads in the direct screw fastening method, the number of leads per rotation is increased, which requires a large tightening torque when torque is applied during rotation driving and the phase of the compressor impeller 4b is shifted. Thus, the occurrence of slippage of the compressor impeller 4b is suppressed.

  As described above, when multiple threads are used, the shaft 3c can be screwed into the compressor impeller 4b in a plurality of phases. Therefore, in this method, in step S3, the shaft 3c (turbine impeller 2b) and the compressor impeller 4b are used. Are marked in advance at the same phase at positions other than the rotation center C. Thereby, in this method, when the 1st marker 10 and the 2nd marker 20 are not in the same phase, it can be judged whether these were assembled | attached with the incorrect phase as a mark. Therefore, in this method, the compressor impeller 4b can be assembled to the shaft 3c at the specific phase for which the balance is adjusted in step S2.

  As described above, according to the above-described embodiment, the male screw portion 4c1 provided at one end of the shaft 3c is screwed into the female screw portion 4b1 provided on the back side of the compressor impeller 4b, and the compressor impeller 4b is screwed. In the assembling method, the male thread portion 3c1 and the female thread portion 4b1 are multi-threaded screws, and a first step (steps S1 to S3) for marking at a position other than the rotation center C of the shaft 3c and the compressor impeller 4b, and the shaft Based on the first marker 10 marked on 3c and the second marker 20 marked on the compressor impeller 4b, a second step (steps S6 to S8) for matching the phases in the rotational direction of the shaft 3c and the compressor impeller 4b. ) And the method of And, it is possible to assemble the compressor impeller 4b to the shaft 3c in a particular phase.

  As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

For example, the cylindrical jig 30A shown in FIGS. 6 and 7 or the cylindrical jig 30B shown in FIGS. 8 and 9 may be used when the compressor impeller 4b is assembled.
FIG. 6 is a perspective view of a jig 30A according to another embodiment of the present invention. FIG. 7 is a cross-sectional view of a jig 30A according to another embodiment of the present invention. FIG. 8 is a perspective view of a jig 30B according to another embodiment of the present invention. FIG. 9 is a cross-sectional view of a jig 30B according to another embodiment of the present invention. In the following description, the same or equivalent components as those in the above-described embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.

As shown in FIGS. 6 and 7, the bearing housing 3 a is fixed to the base 31 when the compressor impeller 4 b is assembled. The jig 30A has a flange portion 30A1 (fastening bolt not shown) that can be attached to the turbine housing 2a, and has a cylindrical portion 30A2 that guides the compressor impeller 4b at the center. The cylindrical portion 30A2 has an inner diameter corresponding to the outer diameter of the compressor impeller 4b.
As shown in FIGS. 8 and 9, the jig 30 </ b> B has a leg portion 30 </ b> B <b> 1 erected from the base 31, and has a cylindrical portion 30 </ b> B <b> 2 that guides the compressor impeller 4 b at the tip. The cylindrical portion 30B2 has an inner diameter corresponding to the outer diameter of the compressor impeller 4b.

  By using the jigs 30A and 30B having the above-described configuration, the radial positioning of the compressor impeller 4b with respect to the shaft 3c can be performed. That is, when the compressor impeller 4b is assembled, if the shaft 3c and the compressor impeller 4b are misaligned or inclined, they cannot be inserted successfully. For this reason, in the above method, the shafts 3c and the compressor impeller 4b are positioned in the radial direction by the jigs 30A and 30B so that the cores are aligned and can be inserted in parallel. As a result, the screw alignment between the shaft 3c and the compressor impeller 4b is facilitated, so that it is possible to eliminate, for example, that a screw thread is erroneously inserted into a thread groove of another phase.

  Further, for example, in the above-described embodiment, the present technique is applied to the method of assembling the compressor impeller of the supercharger. However, the present invention is not limited to this method. For example, the present invention is not limited to the method of assembling the compressor impeller of the centrifugal compressor. Can also be applied.

  DESCRIPTION OF SYMBOLS 1 ... Supercharger, 2b ... Turbine impeller, 3c ... Shaft, 3c1 ... Male screw part, 4b ... Compressor impeller, 4b1 ... Female screw part, 10 ... 1st marker, 20 ... 2nd marker, 30A ... Jig, 30B ... Oji Tool, C ... center of rotation, S1-S3 ... step (first step), S6-S8 ... step (second step)

Claims (7)

A method of assembling a compressor impeller in which a male screw portion provided at one end of a shaft is screwed into a female screw portion provided on the back side of the compressor impeller and screw-coupled,
The male screw part and the female screw part are multi-threaded screws,
A first step of marking at a position other than the rotation center of the shaft and the compressor impeller;
A first marker which is marked on the shaft, on the basis of the second marker is marked compressor impeller, have a, a second step of bringing the rotational direction of the phase between the compressor impeller and the shaft,
A turbine impeller is provided at the other end of the shaft,
The first step includes
Screwing the male screw portion of the shaft into the female screw portion of the compressor impeller and screwing the screw, and adjusting the balance;
With the balance adjusted, the first marker is formed at a position other than the rotation center of the turbine impeller of the shaft or the turbine impeller, and the rotation of the compressor impeller other than the rotation center of the compressor impeller is formed. Forming the second marker in position,
After the first step and before the second step, the screw connection is released, the shaft from which the compressor impeller is removed is inserted into the bearing housing, and then the removed compressor impeller is screwed to the shaft. Has steps,
The method of assembling a compressor impeller, wherein the first marker is exposed to the outside of the bearing housing when the shaft is passed through the bearing housing . In the first step, the one of the turbine impeller, marking a position other than the center of rotation of said turbine impeller, a method of assembling the compressor impeller according to claim 1, characterized in that. Wherein in the second step, the phase difference of the second marker with respect to the first marker around the rotation center initiates the screwing in a position to be 180 degrees, to claim 1 or 2, characterized in Assembling method of the compressor impeller as described. The method for assembling the compressor impeller according to any one of claims 1 to 3 , wherein the multi-thread screw is a triple thread. The said 2nd process WHEREIN: When starting the said screwing, positioning of the radial direction of the said compressor impeller with respect to the said shaft is performed using a cylindrical jig | tool, The any one of Claims 1-4 characterized by the above-mentioned. The method for assembling the compressor impeller according to one item. A screw coupling between a shaft provided with a turbine impeller and a compressor impeller, and a balance adjustment;
With the balance adjusted, a first marker is formed at a position other than the rotation center of the turbine impeller of the shaft or the turbine impeller, and a position of the compressor impeller other than the rotation center of the compressor impeller. Forming a second marker in
Removing the compressor impeller, inserting the shaft into a bearing housing, and screwing the removed compressor impeller to the shaft;
Confirming the phase in the rotational direction of the screw-coupled compressor based on the first marker and the second marker;
Have
A multi-thread screw is used for the screw connection,
The method of assembling a compressor impeller, wherein the first marker is exposed to the outside of the bearing housing when the shaft is passed through the bearing housing. Turbine impeller,
A compressor impeller,
A shaft that is fastened to the compressor impeller by a multi-threaded screw at one end and the turbine impeller is connected to the other end;
A bearing housing through which the shaft is inserted;
Have
A first marker is formed at a position other than the rotation center of the turbine impeller on the shaft or the turbine impeller, and a second marker is formed at a position other than the rotation center of the compressor impeller on the compressor impeller. ,
The supercharger, wherein the first marker is exposed to the outside of the bearing housing.

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