Shafting assembly

Abstract

The shafting assembly is used in a double-supercharging turbocharger, the shafting assembly comprises a rotating shaft, the rotating shaft is sleeved with a floating bearing, and a sleeve body used for assembling a rotor of a motor is fixed to the position, on one side of the floating bearing, of the rotating shaft; and the sleeve body and the rotor on the sleeve body rotate synchronously with the rotating shaft, so that the gravity center of the shafting assembly moves towards the sleeve body. In the application, the electric supercharger and the turbocharger are combined, and the rotor shaft systems of the electric supercharger and the turbocharger are connected in series on the same shaft, so that the gravity center of the rotating shaft system is far away from the turbine, the risk of abrasion of a turbine section bearing of a common turbocharger can be avoided, and meanwhile, the rigidity of the rotating shaft system is adjusted, and the risk of vibration noise is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to turbocharger technical field, concretely relates to a kind of shafting assembly for being used in double supercharging turbocharger. BACKGROUND

[0002] In prior art, engine in vehicle generally uses turbocharger alone, but its power is weak at low speed, and the driving force of exhaust gas is insufficient, so that the speed of turbocharger is low, and the supercharging effect is not obvious.There is also a scheme of directly using electric supercharger, which can produce good supercharging effect by motor at low speed of engine, but the power is not obviously improved at high speed of engine.

[0003] Specifically, electric supercharger is used to provide more air for engine at low speed, but limited by motor speed, electric supercharger cannot provide more air for engine at high speed, and the power response of ordinary turbocharger is worse than that of electric supercharger at low speed, therefore, by combining electric supercharger and turbocharger, and connecting rotor systems of the two in series on the same shaft, the demand for air at low speed and high speed of engine can be met simultaneously.

[0004] Therefore, the shaft assembly in double supercharging turbocharger is further designed and improved. SUMMARY

[0005] In view of the deficiencies in prior art, the utility model provides a kind of shafting assembly, for double supercharging turbocharger, connect the rotor shafting system of electric supercharger and turbocharger in series on the same shaft, so that the gravity center of rotor system is away from turbine, and the risk of bearing wear in turbine section of ordinary turbocharger can be avoided.

[0006] The utility model is solved by the following technical scheme.

[0007] A kind of shafting assembly, the shafting assembly is used in double supercharging turbocharger, the shafting assembly includes shaft, floating bearing is set on the shaft, and the shaft on the side of the floating bearing is fixed with the sleeve for assembling the rotor of motor;The sleeve and the rotor thereon rotate synchronously with the shaft, so that the gravity center of shafting assembly moves to the sleeve.

[0008] In the application, by combining electric supercharger and turbocharger, and connecting rotor shafting systems of the two in series on the same shaft, the gravity center of rotor system is away from turbine, the risk of bearing wear in turbine section of ordinary turbocharger can be avoided, and the stiffness of rotor system is adjusted, to reduce the risk of vibration noise.

[0009] In a preferred embodiment, the sleeve body comprises a first sleeve body and a second sleeve body, and an assembly cavity for arranging the rotor is formed between the first sleeve body and the second sleeve body, and the assembly structure is compact.

[0010] In a preferred embodiment, the first sleeve body is provided with a first annular boss, and the second sleeve body is provided with a second annular boss, and the assembly cavity for arranging the rotor is formed between the first annular boss and the second annular boss.

[0011] In a preferred embodiment, an oil blocking structure is arranged on the outside of the floating bearing and the sleeve body, and an oil passing gap is formed between the radially inner side of the oil blocking structure and the radially outer side of the sleeve body, and the oil passing gap allows lubricating oil to enter the electronic supercharging assembly. In this structure, the lubricating oil lubricates and cools the floating bearing, and at the same time, the lubricating oil enters the electronic supercharging assembly through the oil passing gap on the inner side of the oil blocking structure, lubricates and cools the structural units in the electronic supercharging assembly, has high integration and good effect.

[0012] In a preferred embodiment, an oil throwing groove is formed on the side of the sleeve body towards the oil blocking structure, and the lubricating oil in the oil throwing groove can be thrown out during rotation, and the amount of lubricating oil entering the motor can be effectively controlled, so that the lubricating oil is sufficient for cooling but does not have the risk of leaking to the back of the impeller.

[0013] In a preferred embodiment, the side wall of the oil throwing groove towards the oil blocking structure is a slope inner wall, which facilitates throwing of the oil to the oil blocking structure.

[0014] In a preferred embodiment, the radial width of the oil passing gap is 0.2mm-1mm, and is preferably about 0.5mm.

[0015] In a preferred embodiment, the oil blocking structure has a first wall, a boss and a second wall, and the oil passing gap is located on the radially inner side of the second wall, and the overall structure has good positioning and high stability after assembly.

[0016] In a preferred embodiment, the lower part of the oil blocking structure is provided with an inclined plate for better guiding the lubricating oil collected in the first oil storage cavity to the intermediate body oil return hole, and the first wall has an arc surface structure, and the two ends of the arc surface structure are provided with positioning bending pieces for being clamped on the structure in the central housing for assembly and positioning.

[0017] Compared with the prior art, the utility model has the following beneficial effects: the utility model provides a shafting assembly, which is used in a double supercharging turbocharger, and the rotor shafting systems of the electric supercharger and the turbocharger are connected in series on the same rotating shaft, so that the gravity center of the rotating shaft system is away from the turbine, and the risk of bearing wear of the turbine section of the ordinary turbocharger can be avoided. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a sectional view of the supercharger in the utility model.

[0019] Figure 2 is Figure 1 is an enlarged view of area A in the middle.

[0020] Figure 3 is Figure 2 is an enlarged view of area B in the middle.

[0021] Figure 4 is a perspective view of the shafting assembly in the utility model.

[0022] Figure 5 is a sectional view of the shafting assembly in the utility model.

[0023] Figure 6 is a schematic view of the rotating shaft in the utility model.

[0024] Figure 7 is a perspective view of the oil blocking structure in the utility model. DETAILED DESCRIPTION

[0025] The utility model will be described in further detail below in combination with the drawings and specific embodiments.

[0026] In the following embodiments, the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout, and the following embodiments described by referring to the drawings are exemplary and are only used for explaining the utility model and cannot be understood as limiting the utility model.

[0027] Referring to Figures 1 to 7 , the utility model relates to a kind of shafting assembly combined with electric supercharger and turbocharger, including rotating shaft 15 in the supercharger main body, the both ends of the rotating shaft 15 are provided with turbine assembly 11 and air compression assembly 12 respectively, the rotating shaft 15 passes through floating bearing 171 in central casing 13, then passes through electronic supercharging assembly 14;The electronic supercharging assembly 14 includes rotor and stator, the rotor is fixed on sleeve body, the sleeve body is fixed on the rotating shaft 15 and rotates synchronously;Central casing 13 and electronic supercharging assembly 14 are equipped with oil blocking structure 18, the radial inner side of the oil blocking structure 18 and the radial outer side of sleeve body have oil passing gap 1831, this oil passing gap 1831 allows lubricating oil to enter into electronic supercharging assembly 14, specifically, the radial width of the oil passing gap 1831 is 0.2mm~1mm, preferably about 0.5mm.

[0028] In addition, from the attached Figure 3As can be seen from the drawings, the sleeve body is provided with an inner recessed oil throwing groove 1723 on the side facing the oil blocking structure 18, which can throw out the lubricating oil therein during rotation, so that the lubricating oil is thrown to the oil blocking structure 18 again, which can effectively control the amount of lubricating oil entering the motor, so that it is sufficient for cooling but without the risk of oil leakage to the back of the impeller. The side wall of the oil throwing groove 1723 facing the oil blocking structure 18 can be a straight wall, preferably a sloping inner wall 1729, which facilitates throwing oil to the oil blocking structure 18. Correspondingly, the outside of the oil throwing groove 1723 is provided with an oil guiding structure wall 149, which forms a first oil storage cavity 18A with the oil blocking structure 18, for receiving the oil thrown out of the oil throwing groove 1723 to avoid excessive lubricating oil entering the electronic supercharging assembly 14,

[0029] Specifically, in the above structure, the lubricating oil in the oil throwing groove 1723 is used to cool the rotor assembly, which is high-temperature oil. After being thrown out, part of the high-temperature oil enters the first oil storage cavity 18A and cools down during wall flow, and the cooled lubricating oil flows back to the first oil storage cavity 18A, thereby completing the cooling operation.

[0030] As can be seen from the drawings, Figure 3 As can be seen from the drawings, in the present application, the other side of the oil blocking structure 18 relative to the first oil storage cavity 18A forms a second oil storage cavity 18B for storing lubricating oil on the side of the floating bearing. The stored lubricating oil can exchange with the lubricating oil in the first oil storage cavity 18A for lubrication and cooling.

[0031] As can be seen from the drawings, Figure 5 As can be seen from the drawings, in the present application, the sleeve body includes a first sleeve body 172 and a second sleeve body 173. The first sleeve body 172 is provided with a first annular boss 1722, and the second sleeve body 173 is provided with a second annular boss 1731. The second annular boss 1731 and the first annular boss 1722 form an assembly cavity for arranging the rotor, and the assembly structure is compact. The oil throwing groove 1723 is arranged on the first sleeve body 172.

[0032] In addition, as can be seen from the drawings, Figure 6 As can be seen from the drawings, in the present application, the rotating shaft 15 is provided with two first convex rings 151, which are respectively supported on the inner walls at both ends of the floating bearing 171 for forming a floating oil film. The two first convex rings 151 have a first narrow section 157 therebetween. The rotating shaft 15 is further provided with a second convex ring 152 and a third convex ring 153. The second convex ring 152 is assembled with the inner wall of the first sleeve body 172, and the third convex ring 153 is assembled with the inner wall of the second sleeve body 173. The second convex ring 152 and the third convex ring 153 have a second narrow section 158 therebetween. The diameter of the second narrow section 158 is smaller than that of the first narrow section 157, so as to ensure high stability of the rotating shaft 15.

[0033] Further, the rotating shaft 15 is further provided with two fourth convex rings 154 for supporting on the inner wall of the impeller mounting through hole, and a third narrow section 159 is arranged between the two fourth convex rings 154; the diameter of the third narrow section 159 is smaller than the diameter of the second narrow section 158; and the diameter of the fourth convex ring 154 is smaller than the diameter of the third convex ring 153, the diameter of the third convex ring 153 is smaller than the diameter of the second convex ring 152, the diameter of the second convex ring 152 is smaller than the diameter of the first convex ring 151, so that the gravity center configuration of the rotating shaft 15 can be further optimized, and the risk of turbine section bearing wear of the turbocharger can be avoided.

[0034] From the attached Figure 7 It can be seen that the oil blocking structure 18 in the application has a first wall 181 facing the central housing 13, a boss 182 protruding towards the electronic supercharging assembly 14, a second wall 183 arranged on the boss 182, and an oil passing gap 1831 arranged on the radially inner side of the second wall 183. The overall structure has good positioning and high stability after assembly. The lower part of the oil blocking structure 18 is provided with an inclined plate 184 for better guiding the lubricating oil collected in the first oil storage cavity 18A to the intermediate body oil return hole; the first wall 181 has an arc surface structure, and the two ends of the arc surface structure are provided with positioning bending parts 185 for assembly and positioning on the structure in the central housing.

[0035] In the design of the turbocharger, if the rotating shaft center (gravity center) is close to the turbine end, the turbine end bearing part will bear greater force, and the turbine end will cause the yield strength of the bearing material to decrease due to the influence of high-temperature gas, that is, the required stress of the bearing decreases, and the gravity center deviation and high temperature are superimposed to cause a high risk of turbine end bearing failure.

[0036] In the application, the electronic supercharging and the turbocharger are combined, and the rotor shaft systems of the two are connected in series on the same shaft. The lubricating oil lubricates and cools the floating bearing, and at the same time, can smoothly enter the electronic supercharging assembly through the oil passing gap in the oil blocking structure, lubricate and cool the structural units therein, has high integration and good effect. Further, since the rotor is fixed on the rotating shaft 15 through the sleeve, the gravity center of the rotating shaft system is away from the turbine, which can avoid the risk of ordinary turbocharger turbine section bearing wear, and the stiffness of the rotating shaft system is adjusted to reduce the risk of vibration and noise.

[0037] In addition, when the engine of the vehicle is at low speed, the engine has no sufficient exhaust capacity for the turbocharger to absorb, at this time, the electric supercharger (the electronic supercharging assembly 14) intervenes in work, drives the rotation of the rotating shaft 15, and the engine intake can be effectively improved; when the engine is at high speed, the engine has sufficient exhaust capacity, the turbocharger turbine absorbs the exhaust energy, the energy absorbed by the turbine is transmitted to the rotating shaft 15, and the energy on the rotating shaft 15 can be distributed to the compressor impeller and the motor in the electronic supercharging assembly 14 according to the requirement. Therefore, it can be seen that the technical scheme in the application can absorb the engine exhaust energy to the maximum extent, and because the electric supercharging rotor and the turbocharger use the same rotating shaft 15, the structure is compact and the transmission efficiency is high. The working process is summarized, the vibration of the electronic rotor can be dispersed to the lubricating oil film of the turbine bearing to absorb, which can effectively improve the NVH level. Moreover, in the application, the mass of the rotating shaft 15 and the parts of the rotating shaft system is redistributed, so that the center of gravity of the rotating shaft is away from the turbine, and the risk of wear of the turbine bearing of the ordinary turbocharger can be avoided.

[0038] The protection scope of the utility model includes but is not limited to the above implementation, the protection scope of the utility model is subject to the claims, any replacement, deformation, improvement of the technical personnel in the art to the present technology is easily thought of and falls into the protection scope of the utility model.

Claims

1. A shaft assembly for use in a twin-charged turbocharger, the shaft assembly comprising a rotating shaft (15), characterized in that, A floating bearing (171) is fitted on the shaft (15), and a sleeve for assembling the rotor of the motor is fixed on one side of the shaft (15). The sleeve and its rotor rotate synchronously with the rotating shaft (15), causing the center of gravity of the shaft system assembly to move toward the sleeve.

2. A shaft system assembly according to claim 1, characterized in that, The sleeve includes a first sleeve (172) and a second sleeve (173), and an assembly cavity for mounting a rotor is formed between the first sleeve (172) and the second sleeve (173).

3. A shaft system assembly according to claim 2, characterized in that, The first sleeve (172) is provided with a first annular boss (1722), and the second sleeve (173) is provided with a second annular boss (1731). The second annular boss (1731) and the first annular boss (1722) form an assembly cavity for mounting the rotor.

4. A shaft system assembly according to claim 1, characterized in that, An oil-blocking structure (18) is provided on the outer side of the junction between the floating bearing (171) and the sleeve. There is an oil passage gap (1831) between the radial inner side of the oil-blocking structure (18) and the radial outer side of the sleeve. The oil passage gap (1831) allows lubricating oil to enter the electronic booster assembly (14).

5. A shaft system assembly according to claim 4, characterized in that, The sleeve has an inwardly recessed oil-throwing groove (1723) on the side facing the oil-blocking structure (18).

6. A shaft system assembly according to claim 5, characterized in that, The sidewall of the oil slinger (1723) facing the oil-blocking structure (18) is a sloping inner wall (1729).

7. A shaft system assembly according to claim 4, characterized in that, The radial width of the oil-filled gap (1831) is 0.2 mm to 1 mm.

8. A shaft system assembly according to claim 4, characterized in that, The oil-blocking structure (18) has a first wall (181), a boss (182), and a second wall (183); the oil passage gap (1831) is located radially inside the second wall (183).

9. A shaft system assembly according to claim 8, characterized in that, The lower part of the oil-blocking structure (18) is provided with an inclined plate (184), and the first wall (181) has an arc surface structure, with positioning bending parts (185) at both ends of the arc surface structure.

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