CN103438058A - Thread interference locking connection method and connection structure for rotating shaft of titanium aluminum supercharger turbine - Google Patents
Thread interference locking connection method and connection structure for rotating shaft of titanium aluminum supercharger turbine Download PDFInfo
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- CN103438058A CN103438058A CN2013103843724A CN201310384372A CN103438058A CN 103438058 A CN103438058 A CN 103438058A CN 2013103843724 A CN2013103843724 A CN 2013103843724A CN 201310384372 A CN201310384372 A CN 201310384372A CN 103438058 A CN103438058 A CN 103438058A
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Abstract
The invention relates to a thread interference locking connection method and a connection structure for a rotating shaft of a titanium aluminum supercharger turbine. The connection structure comprises the titanium aluminum turbine (2), the 42CrMo alloy rotating shaft (1) and an elastic cylindrical locking dowel (3). An outer thread is arranged on the end portion of the titanium aluminum turbine (2), and the rotation direction of the outer thread is the same as the rotation direction of a turbine impeller from the turbine end. An inner thread in interference fit with the outer thread on the end portion of the titanium aluminum turbine (2) is arranged on the end portion of the 42CrMo alloy rotating shaft (1). A dowel hole used for assembling the elastic cylindrical locking dowel (3) is formed in the matching portion of the titanium aluminum turbine (2) and the 42CrMo alloy rotating shaft (1), the axial included angle between the dowel hole and the 42CrMo alloy rotating shaft is 15-30 degrees, and therefore the titanium aluminum supercharger turbine impeller and the 42CrMo alloy rotating shaft can be connected lastingly and reliably. In addition, the technical process is simple, engineering can be achieved easily, and the connection strength requirement of the supercharger turbine rotating shaft can be met.
Description
Technical field
The invention belongs to automobile-used turbocharging technology field, be specifically related to a kind of screw thread interference locking connecting means and linkage structure of titanium aluminium rotating shaft of supercharger turbine.
Background technique
Turbine shaft is one of core component of vehicle turbocharger, by turbine and rotating shaft, is formed by connecting.At present, the turbine of diesel engine for automobile turbosupercharger generally adopts cast nickel-base alloy K418 (this density of material is 8.0 * 10
3kg/m
3), rotating shaft adopts the 42CrMo alloy steel material.Rotating shaft for the booster turbine of being manufactured by the K418 alloy and the manufacture of 42CrMo alloyed steel, can adopt friction-welding technique to realize the reliable connection of turbine shaft usually.Yet, because the density ratio of K418 alloy is larger, the booster turbine rotary inertia of being manufactured by the K418 alloy is also relatively large, causes the transient response of exhaust gas turbocharge motor poor, the over-emitting black exhaust phenomenon of motor when starting and acceleration is serious.
For rotary inertia, the transient response that improves the exhaust gas turbocharge motor that reduces turbocharger rotor, the over-emitting black exhaust phenomenon while reducing start/acceleration, vehicle supercharger turbine can adopt the cast ti al alloy material that specific strength is higher to replace the K418 alloy.Because the density of titanium-aluminium alloy is only 3.87 * 10
3kg/m
3161GPa when Young's modulus is 500 ℃, Ti-Al alloy material has again good high-temperature behavior and oxidation resistance simultaneously, the booster turbine impeller of manufacturing with titanium-aluminium alloy, not only can reduce the rotary inertia of turbocharger rotor, but also contribute to improve the aeroperformance of turbine, reach the purpose that improves the turbosupercharged engine transient response, improves engine performance.Yet, because titanium-aluminium alloy belongs to intermetallic compounds, adopt the normal welding method, be difficult to realize reliable connection of titanium aluminium turbine and the rotating shaft of 42CrMo alloy.
Aspect being connected of titanium aluminium turbine and the rotating shaft of 42CrMo alloy, by the retrieval to domestic and international disclosed technical data and patent, find altogether 3 relevant patent of invention.Wherein, methods that these two patents that the patent No. is 97125874.0 and 200810110548.6 propose directly to adopt mechanical interference to connect realize being connected between titanium-aluminum alloy turbine and the rotating shaft of 42CrMo alloy, but due to vehicle supercharger turbine and rotating shaft connection part operating temperature higher, and the fluctuation of pressurized machine working speed is larger, the method that directly adopts mechanical interference to connect will be difficult to effectively guarantee the long time stability of titanium-aluminum alloy turbine and 42CrMo alloy rotating shaft join strength.The patent that the patent No. is 201310166758.8 proposes interference thread and the anti-loosening connecting means combined of pin and linkage structure, titanium-aluminum alloy turbine adopts internal thread, the rotating shaft of 42CrMo alloy adopts outside thread, pin hole parallels with the axis of turbine shaft, although this connecting means and linkage structure can realize reliable connection of titanium aluminium turbine shaft, but because the cutting ability of Ti-Al alloy material is poor, titanium-aluminum alloy turbine in the process of machining internal thread, be easy to burst apart and machining accuracy generally not high, simultaneously, because rotating shaft of supercharger turbine is longer, the pin hole difficulty of processing parallel with the turbine shaft axis is larger.
Summary of the invention
The present invention is directed to titanium aluminium turbine that current Ti-Al alloy material faces in the vehicle supercharger turbine application process and the connectivity problem of 42CrMo alloy rotating shaft, a kind of screw thread interference locking connecting means and linkage structure of titanium aluminium rotating shaft of supercharger turbine are proposed, can realize that titanium aluminium turbine reliably is connected with the lasting of 42CrMo alloy rotating shaft, meets the join strength requirement of titanium aluminium rotating shaft of supercharger turbine.
Technological scheme of the present invention:
A kind of screw thread interference locking linkage structure of titanium aluminium rotating shaft of supercharger turbine, comprise titanium aluminium turbine 2,42CrMo alloy rotating shaft 1 and elastic cylinder safetied pin 3, it is characterized in that: there is outside thread described titanium aluminium turbine 2 ends, from turbine end, see that external thread rotary is to identical with the turbine wheel rotation direction; There is the internal thread with titanium aluminium turbine 2 end outside thread interference fit described 42CrMo alloy rotating shaft 1 end; The matching part of described titanium aluminium turbine 2 and 42CrMo alloy rotating shaft 1 has the pin hole for tight pin 3 assemblings of elasticity cylinder lock, the axial angle of described pin hole and the rotating shaft of 42CrMo alloy is 15 °-30 °, pin hole quantity is 2-4 and uniform, the pin hole diameter is 2-3mm, and pin hole penetrates the rotating shaft of 42CrMo alloy and enters the inner 3-5mm of titanium aluminium turbine.
For avoiding producing stress raisers at turbine wheel back of the body place, improve titanium aluminium turbine intensity, prevent the faults such as titanium aluminium turbine disperses, preferably titanium aluminium turbine 2 is taken turns the back of the body has 180 ° of knuckles with the screw thread transition portion, can effectively overcome the poor defect of titanium aluminium turbine toughness, improve the intensity of screw thread.
For further improving join strength and connection reliability, preferably at the bottom of the tooth of titanium aluminium turbine 2 outside threads and 42CrMo alloy rotating shaft 1 internal thread and crest circular arc is all arranged, and radius of rounded root is less than radius of rounded crest.
A kind of screw thread interference locking connecting means of titanium aluminium rotating shaft of supercharger turbine is characterized in that: comprise the following steps:
Determining of a, titanium aluminium turbine and 42CrMo alloy rotating shaft interference thread linkage structure parameter and pin lock locking structure parameter: titanium aluminium turbine adopts outside thread, the rotating shaft of 42CrMo alloy adopts internal thread, the screw connection point interference fit, from turbine end, thread rotary orientation is identical with the sense of rotation of pressurized machine rotating shaft, 180 ° of knuckles are arranged between titanium aluminium turbine back of the body dish and screw thread, at the bottom of internal thread and externally threaded tooth and crest circular arc is all arranged, and radius of rounded root is less than radius of rounded crest;
The processing of b, titanium-aluminum alloy turbine outside thread, location end face, the wheel back of the body and 180 ° of transition arcs of screw thread;
C, 42CrMo alloy rotating shaft internal thread and the processing of locating end face;
D, titanium-aluminum alloy turbine and the assembling of 42CrMo alloy rotating shaft interference thread: take to heat the measure of 42CrMo alloy rotating shaft threaded connecting sleeve, screw the assembling that realizes titanium aluminium turbine and 42CrMo rotating shaft by screw thread;
E, the processing of titanium aluminium turbine shaft safetied pin hole: the titanium aluminium turbine shaft that completes the interference thread assembling is processed to the safetied pin hole at the B end face, the axial angle of pin hole and turbine shaft is 15 °-30 °, the quantity in hole is 2-4 and uniform, the diameter in hole is 2-3mm, pin hole is blind hole, and hole depth will guarantee to penetrate the rotating shaft of 42CrMo alloy and enter the inner 3-5mm of titanium-aluminum alloy turbine;
The assembling of f, elastic cylindrical pin and titanium aluminium turbine shaft: the elastic cylindrical pin that will be complementary with pin hole is packed in the safetied pin hole of titanium aluminium turbine shaft, and elastic cylindrical pin does not exceed the B end face;
G, to completing the titanium aluminium rotating shaft of supercharger turbine that screw thread interference locking connects, carry out the processing at other positions.
The invention has the beneficial effects as follows:
The screw thread interference of titanium aluminium rotating shaft of supercharger turbine locking linkage structure, can realize reliably being connected lastingly between titanium aluminium turbine and the rotating shaft of 42CrMo alloy; Both can effectively guarantee the join strength of turbine and rotating shaft, prevent from when turbine shaft work is heated occurring loosening; Reduced the difficulty of processing of titanium aluminium turbine connecting thread simultaneously; Linkage structure is simple, and join strength is reliable lastingly, can meet the through engineering approaches application needs of titanium aluminium rotating shaft of supercharger turbine.
The accompanying drawing explanation
Fig. 1 is the screw thread interference locking linkage structure schematic diagram of titanium aluminium turbine shaft.
Fig. 2 is internal thread and externally threaded structure partial enlarged view.
1 42CrMo alloy rotating shaft 2 titanium aluminium turbine 3 elastic cylinder safetied pins
Embodiment
A kind of screw thread interference locking connecting means of titanium aluminium rotating shaft of supercharger turbine comprises the following steps:
A, the screw thread interference locking linkage structure design of titanium aluminium rotating shaft of supercharger turbine: determine titanium-aluminum alloy turbine and 42CrMo alloy rotating shaft interference thread linkage structure parameter and pin lock locking structure parameter, titanium-aluminum alloy turbine adopts outside thread, the rotating shaft of 42CrMo alloy adopts internal thread, screw connection point has certain magnitude of interference, by the A end face, position, from turbine end, thread rotary orientation is identical with the sense of rotation of pressurized machine rotating shaft, 180 ° of knuckles are arranged between titanium aluminium turbine back of the body dish and screw thread, at the bottom of internal thread and externally threaded tooth and crest circular arc is all arranged, and radius of rounded root is less than radius of rounded crest, as depicted in figs. 1 and 2, for example, when titanium aluminium turbine diameter is Φ 95mm, bearing support turbine end shaft hole diameter is Φ 30mm, while from turbine end, seeing that the pressurized machine sense of rotation is left-handed, titanium aluminium turbine screw thread interference fit Conncetion cimension parameter is M16 * 1-p6p6-LH, rotating shaft screw thread interference fit Conncetion cimension parameter is M16 * 1-H7H7-LH, reach is 12mm, the perpendicularity of titanium aluminium turbine and 42CrMo rotating shaft counterface A and axis is less than 0.05, 180 ° of knuckles between titanium aluminium turbine back of the body dish and screw thread are R3, at the bottom of titanium aluminium turbine outside thread and the externally threaded tooth of rotating shaft and the crest circular arc be respectively R0.3 and R0.5, it is 30 ° that crest all has circular arc pin hole and the axial angle of turbine shaft, pin hole quantity be 3 uniform, bore dia is 2mm, the pin hole depth is 6mm,
B, titanium-aluminum alloy turbine outside thread, the wheel back of the body and 180 ° of transition arcs of screw thread, location end face processing: the definite dimensional parameters according to step a, screw connection point, the wheel back of the body of titanium aluminium turbine are processed with 180 ° of transition arcs of screw thread, location end face A;
The processing of c, 42CrMo alloy rotating shaft internal thread and location end face: the definite parameters of structural dimension according to step a, screw connection point and the location end face A of 42CrMo rotating shaft processed;
D, titanium-aluminum alloy turbine and the assembling of 42CrMo alloy rotating shaft interference thread: take the technical measures to the heating of 42CrMo alloy rotating shaft threaded connecting sleeve, screw the interference thread assembling that realizes titanium aluminium turbine and 42CrMo rotating shaft by screw thread;
The processing of e, titanium aluminium turbine shaft safetied pin hole: the definite parameters of structural dimension according to step a, to the titanium aluminium turbine shaft that completes the interference thread assembling in B end face processing safetied pin hole;
The assembling of f, elastic cylindrical pin and titanium aluminium turbine shaft: according to diameter and the degree of depth in safetied pin hole, choose suitable elastic cylindrical pin, the elastic cylindrical pin that will be complementary with pin hole is packed in the safetied pin hole of titanium aluminium turbine shaft, guarantees that elastic cylindrical pin does not exceed the B end face;
The processing at g, other positions of titanium aluminium turbine shaft: according to the structural parameter of titanium aluminium turbine shaft, the titanium aluminium rotating shaft of supercharger turbine that completes screw thread interference locking connection is carried out to the processing at other positions.
For turbine diameter, be that Φ 95mm, bearing support turbine end shaft hole diameter are Φ 30mm, from turbine end, see that the pressurized machine sense of rotation is left-handed turbosupercharger, preferably screw thread interference locking linkage structure is: titanium aluminium turbine outside thread adopts M16 * 1-p6p6-LH, 42CrMo alloy rotating shaft internal thread adopts M16 * 1-H7H7-LH, titanium aluminium turbine outside thread and 42CrMo alloy rotating shaft internal thread length are 12mm, and titanium aluminium turbine and the counterface of 42CrMo alloy rotating shaft and the perpendicularity of axis are less than 0.05; 180 ° of knuckles between titanium aluminium turbine back of the body dish and screw thread are R3; At the bottom of the tooth of titanium aluminium turbine outside thread and 42CrMo alloy rotating shaft internal thread and the crest circular arc be respectively R0.3 and R0.5; The axial angle of circular arc pin hole and turbine shaft is 30 °, pin hole quantity be 3 uniform, bore dia is 2mm, the pin hole depth is 6mm.
Claims (8)
1. linkage structure is locked in the screw thread interference of a titanium aluminium rotating shaft of supercharger turbine, comprise titanium aluminium turbine (2), 42CrMo alloy rotating shaft (1) and elastic cylinder safetied pin (3), it is characterized in that: there is outside thread described titanium aluminium turbine (2) end, from turbine end, sees that external thread rotary is to identical with the turbine wheel rotation direction; There is the internal thread with titanium aluminium turbine (2) end outside thread interference fit described 42CrMo alloy rotating shaft (1) end; The matching part of described titanium aluminium turbine (2) and 42CrMo alloy rotating shaft (1) has the pin hole for the tight pin of elasticity cylinder lock (3) assembling, the axial angle of described pin hole and the rotating shaft of 42CrMo alloy is 15 °-30 °, pin hole quantity is 2-4 and uniform, the pin hole diameter is 2-3mm, and pin hole penetrates 42CrMo alloy rotating shaft (1) and enters the inner 3-5mm of titanium aluminium turbine (2).
2. linkage structure is locked in titanium aluminium turbine shaft screw thread interference according to claim 1, it is characterized in that: the wheel back of the body of titanium aluminium turbine (2) has 180 ° of knuckles with the screw thread transition portion.
3. linkage structure is locked in titanium aluminium turbine shaft screw thread interference according to claim 1, it is characterized in that: at the bottom of the tooth of titanium aluminium turbine (2) outside thread and 42CrMo alloy rotating shaft (1) internal thread and crest circular arc is all arranged, and radius of rounded root is less than radius of rounded crest.
4. linkage structure is locked in titanium aluminium turbine shaft screw thread interference according to claim 1, it is characterized in that: titanium aluminium turbine outside thread adopts M16 * 1-p6p6-LH, 42CrMo alloy rotating shaft internal thread adopts M16 * 1-H7H7-LH, titanium aluminium turbine outside thread and 42CrMo alloy rotating shaft internal thread length are 12mm, and titanium aluminium turbine and the counterface of 42CrMo alloy rotating shaft and the perpendicularity of axis are less than 0.05.
5. linkage structure is locked in titanium aluminium turbine shaft screw thread interference according to claim 2, and it is characterized in that: 180 ° of knuckles between titanium aluminium turbine back of the body dish and screw thread are R3.
6. titanium aluminium turbine shaft screw thread interference according to claim 3 locking linkage structure is characterized in that: at the bottom of the tooth of titanium aluminium turbine outside thread and 42CrMo alloy rotating shaft internal thread and the crest circular arc be respectively R0.3 and R0.5.
7. titanium aluminium turbine shaft screw thread interference according to claim 1 locking linkage structure, it is characterized in that: the axial angle of circular arc pin hole and turbine shaft is 30 °, pin hole quantity be 3 uniform, bore dia is 2mm, the pin hole depth is 6mm.
8. the screw thread interference of titanium aluminium rotating shaft of supercharger turbine locking connecting means is characterized in that: comprise the following steps:
Determining of a, titanium aluminium turbine and 42CrMo alloy rotating shaft interference thread linkage structure parameter and pin lock locking structure parameter: titanium aluminium turbine adopts outside thread, the rotating shaft of 42CrMo alloy adopts internal thread, the screw connection point interference fit, from turbine end, thread rotary orientation is identical with the sense of rotation of pressurized machine rotating shaft, 180 ° of knuckles are arranged between titanium aluminium turbine back of the body dish and screw thread, at the bottom of internal thread and externally threaded tooth and crest circular arc is all arranged, and radius of rounded root is less than radius of rounded crest;
The processing of b, titanium-aluminum alloy turbine outside thread, location end face, the wheel back of the body and 180 ° of transition arcs of screw thread;
C, 42CrMo alloy rotating shaft internal thread and the processing of locating end face;
D, titanium-aluminum alloy turbine and the assembling of 42CrMo alloy rotating shaft interference thread: take to heat the measure of 42CrMo alloy rotating shaft threaded connecting sleeve, screw the assembling that realizes titanium aluminium turbine and 42CrMo rotating shaft by screw thread;
E, the processing of titanium aluminium turbine shaft safetied pin hole: the titanium aluminium turbine shaft that completes the interference thread assembling is processed to the safetied pin hole at the B end face, the axial angle of pin hole and turbine shaft is 15 °-30 °, the quantity in hole is 2-4 and uniform, the diameter in hole is 2-3mm, pin hole is blind hole, and hole depth will guarantee to penetrate the rotating shaft of 42CrMo alloy and enter the inner 3-5mm of titanium-aluminum alloy turbine;
The assembling of f, elastic cylindrical pin and titanium aluminium turbine shaft: the elastic cylindrical pin that will be complementary with pin hole is packed in the safetied pin hole of titanium aluminium turbine shaft, and elastic cylindrical pin does not exceed the B end face;
G, to completing the titanium aluminium rotating shaft of supercharger turbine that screw thread interference locking connects, carry out the processing at other positions.
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Cited By (9)
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| CN103846613A (en) * | 2014-02-12 | 2014-06-11 | 中国北方发动机研究所(天津) | Connection method and connection structure of tapered threads of impeller and rotating shaft of turbine of supercharger |
| EP3006157A3 (en) * | 2014-09-16 | 2016-05-25 | Honeywell International Inc. | Turbocharger shaft and wheel assembly |
| CN105666144A (en) * | 2016-03-24 | 2016-06-15 | 中国北方发动机研究所(天津) | Composite supercharger turbine rotating shaft and machining assembly method thereof |
| CN106002284A (en) * | 2016-06-29 | 2016-10-12 | 中国北方发动机研究所(天津) | Automotive supercharger turbo rotating shaft structure and processing and assembling method thereof |
| US9821410B2 (en) | 2014-09-16 | 2017-11-21 | Honeywell International Inc. | Turbocharger shaft and wheel assembly |
| US9827631B2 (en) | 2014-09-16 | 2017-11-28 | Honeywell International Inc. | Turbocharger shaft and wheel assembly |
| US10041351B2 (en) | 2014-09-16 | 2018-08-07 | Honeywell International Inc. | Turbocharger shaft and wheel assembly |
| CN110131033A (en) * | 2019-04-02 | 2019-08-16 | 中国北方发动机研究所(天津) | A kind of turbine interference connection stress smoothly transits structure |
| CN114135339A (en) * | 2021-11-26 | 2022-03-04 | 中国北方发动机研究所(天津) | Profile connecting method for turbine impeller and rotating shaft |
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| CN110131033A (en) * | 2019-04-02 | 2019-08-16 | 中国北方发动机研究所(天津) | A kind of turbine interference connection stress smoothly transits structure |
| CN114135339A (en) * | 2021-11-26 | 2022-03-04 | 中国北方发动机研究所(天津) | Profile connecting method for turbine impeller and rotating shaft |
| CN114135339B (en) * | 2021-11-26 | 2023-04-25 | 中国北方发动机研究所(天津) | Contour profile connecting method for turbine impeller and rotating shaft |
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