Variable-section nozzle ring of turbocharger

Abstract

A plurality of first mounting holes are formed in the axial end face of a supporting sleeve in the circumferential direction, each first mounting hole is matched with a rotating shaft in a rotating mode, one end of each rotating shaft is fixed to a blade, one end of each rotating shaft is connected with one end of a shifting fork, a shifting disc is in an annular shape, and the other end of each shifting fork is connected with the corresponding blade. A plurality of assembling grooves are formed in the inner circumferential face of the shifting disc, the other end of each shifting fork is matched with the corresponding assembling groove, the positioning part is fixed to the supporting sleeve and used for being matched with the other end of the corresponding shifting fork, and after the gasket is arranged on the axial limiting part in a sleeving mode, the gasket and the axial limiting part form a combination groove, and after the axial limiting part and the supporting sleeve are fixed, the gasket and the axial limiting part form a combination groove. The shifting disc is in clearance fit with the combination groove, and the axial end face of the shifting disc is matched with the gasket and the axial limiting component. When the nozzle ring is assembled with the turbocharger, the shifting disc can be prevented from being separated from the supporting sleeve.

Description

Technical Field

[0001] This utility model relates to the field of turbocharger technology, and specifically to a variable cross-section nozzle ring for a turbocharger. Background Technology

[0002] VNT turbochargers help improve torque levels—especially at lower engine speeds—while also increasing engine power over a wider power range, resulting in quicker acceleration through improved transient response and promoting more environmentally friendly combustion. Turbochargers also promote exhaust gas recirculation, reducing emissions. VNT technology is also a key driver of engine downsizing. Engine downsizing, as an industry trend, delivers equal or better performance compared to larger displacement engines with smaller displacement, more fuel-efficient, and lower-emission powertrains.

[0003] The nozzle ring is a component in VNT technology used to regulate turbine flow, controlling turbocharger speed by changing its flow area. Minimum opening flow rate is a key parameter. The nozzle ring has many important design points: the clearance between the blade rotation axis and the bore, the clearance between the blade height and the spacer sleeve—all these clearances affect the airflow; the clearance between the shift fork and the shift disc, the welding angle between the blade and the shift fork, and the pin hole position accuracy—all these clearances affect the accuracy of the blade rotation angle. Even slight deviations in these dimensional fits during manufacturing can alter the nozzle ring's minimum opening flow rate.

[0004] Currently used nozzle rings have clearance fits between the pins, rollers, and base of the fixed actuation disc. Because of this clearance fit, when installing the nozzle ring into the turbocharger, the actuation disc is subjected to force during the operation of the nozzle ring by the operator's hand or by using clamping tools. This process can easily cause the actuation disc, pins, and support sleeve to separate, increasing the difficulty of assembly and raising labor costs.

[0005] In addition, a limiting pin is installed on the support sleeve. This limiting pin is used to restrict the swing angle of the shift fork, thereby controlling the minimum opening flow rate. After the shift fork swings, it abuts against the limiting pin. Since the existing limiting pin is a cylindrical pin, there is only one position where the shift fork abuts against the limiting pin, thus only one minimum opening flow rate can be achieved. Consequently, only one minimum opening can be made. During the development process, in order to obtain suitable flow rate data, the measured value of the minimum opening flow rate of the nozzle ring often differs from the design value. In existing products, when a manufacturing deviation occurs in the nozzle ring, it is necessary to organize re-production and repeatedly change the size of the limiting pin to test and find a suitable size. This not only seriously affects the development progress but also increases the development time and cost. Utility Model Content

[0006] This invention provides a variable cross-section nozzle ring for a turbocharger, which can prevent the actuation disc and support sleeve from separating when the nozzle ring of this invention is assembled with the turbocharger.

[0007] A variable section nozzle ring for a turbocharger includes a support sleeve, a rotating shaft, blades, a shift fork, a shift disc, and a positioning component. The support sleeve has multiple first mounting holes circumferentially arranged on its axial end face. Each first mounting hole rotatably engages with a rotating shaft. One end of each rotating shaft is fixed to a blade, and one end of each rotating shaft is connected to one end of a shift fork. The shift disc is annular, and its inner circumferential surface has multiple mounting grooves. The other end of each shift fork engages with a mounting groove. The positioning component is fixed to the support sleeve and engages with the other end of the shift fork. The system also includes a washer and an axial limiting component. After the washer is fitted onto the axial limiting component, a mating groove is formed between the washer and the axial limiting component. After the axial limiting component is fixed to the support sleeve, the shift disc engages with the mating groove with a clearance. The axial end face of the shift disc engages with both the washer and the axial limiting component.

[0008] Furthermore, the axial limiting component includes a pin and a limiting plate that axially limits the actuating disc. One end of the pin is fixed to the limiting plate, and the other end of the pin is fixed to the support sleeve. The engagement groove is formed between the limiting plate and the washer.

[0009] Furthermore, the positioning component includes a connecting component and a cam for adjusting the swing angle of the adjustment fork. One end of the connecting component engages with the support sleeve, and the other end of the connecting component is connected to the cam.

[0010] Furthermore, the axial end face of the support sleeve is provided with a plurality of second mounting holes along the circumferential direction, and the connecting component is interference-fitted with the second mounting holes, or the connecting component is threadedly connected to the second mounting holes.

[0011] In this invention, after the axial limiting component is fixed to the support sleeve, the actuating disc is clamped between the axial limiting component and the washer, thereby axially limiting the actuating disc. This prevents the actuating disc from separating from the limiting component and the support sleeve, both during assembly and transportation. Therefore, the structure of this invention improves production efficiency and saves production costs. Furthermore, since the positioning component is used to stop the shift fork to control the minimum opening flow rate, and the positioning component has a cam structure, it offers the advantage of adjustable flow rate. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the variable cross-section nozzle ring of the first type of turbocharger.

[0013] Figure 2 for Figure 1 A schematic diagram of the positioning component.

[0014] Figure 3 This is a schematic diagram of the variable cross-section nozzle ring for the second type of turbocharger.

[0015] Figure label:

[0016] Support sleeve 1, rotating shaft 2, blade 3, shift fork 4, shift disc 5, assembly groove 5a, washer 6, axial limiting component 7, pin 7a, limiting disc 7b, engagement groove 8, positioning component 9, connecting component 9a, cam 9b, pin 10. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0020] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "connection", "linking", "fixing" and other such terms should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components, unless otherwise explicitly limited.

[0021] like Figures 1 to 2As shown, a variable section nozzle ring for a turbocharger according to this utility model includes a support sleeve 1, a rotating shaft 2, a blade 3, a shift fork 4, a shift disk 5, and a positioning component 9. The axial end face of the support sleeve 1 is provided with a plurality of first mounting holes along the circumferential direction. The first mounting holes are through holes. Each first mounting hole is rotatably engaged with a rotating shaft 2. The rotating shaft 2 passes through the first mounting hole and is clearance-fitted with the first mounting hole. Both ends of the rotating shaft 2 are exposed outside the first mounting holes. One end of each rotating shaft 2 is fixed to a blade 3, and one end of each rotating shaft 2 is connected to one end of a shift fork 4.

[0022] The actuating disk 5 is annular, and multiple mounting grooves 5a are provided on the inner circumferential surface of the actuating disk 5. The other end of each shift fork 4 is engaged with the mounting groove 5a. The positioning component 9 is fixed on the support sleeve 1. The positioning component 9 is used to engage with the other end of the shift fork 4 to limit the swing angle of the shift fork 4. That is, when the shift fork 4 forms abutment with the positioning component 9 during the swing process, the positioning component 9 restricts the shift fork 4, thereby limiting the swing angle of the shift fork 4.

[0023] This utility model also includes a washer 6 and an axial limiting component 7. After the washer 6 is fitted onto the axial limiting component 7, a mating groove 8 is formed between the washer 6 and the axial limiting component 7. After the axial limiting component 7 is fixed to the support sleeve 1, the actuating disk 5 is in clearance fit with the mating groove 8. The axial end face of the actuating disk 5 mates with the washer 6 and the axial limiting component 7 respectively. The actuating disk 5 preferentially adopts a clearance fit with the washer 6 and the axial limiting component 7 in the axial direction. When the actuating disk 5 needs to rotate, this clearance fit facilitates the flexible rotation of the actuating disk 5 and avoids jamming.

[0024] In this invention, after the axial limiting component 7 is fixed to the support sleeve 1, the actuating disc 5 is clamped between the axial limiting component 7 and the washer 6, thereby axially limiting the actuating disc 5. This prevents the actuating disc from separating from the limiting component 7 and the support sleeve, both during assembly and transportation. Therefore, the structure of this invention improves production efficiency and saves production costs.

[0025] The axial limiting component 7 includes a pin 7a and a limiting plate 7b that axially limits the actuating disc 5. One end of the pin 7a is fixed to the limiting plate 7b, and the other end of the pin 7a is fixed to the support sleeve 1. The engagement groove 8 is formed between the limiting plate 7b and the washer 6. The support sleeve 1 is provided with an assembly hole, which can be a smooth hole or a threaded hole. The pin 7a is interference-fitted with the assembly hole or threadedly connected.

[0026] The positioning component 9 includes a connecting component 9a and a cam 9b for adjusting the swing angle of the adjusting fork 4. One end of the connecting component 9a engages with the support sleeve 1, and the other end of the connecting component 9a is connected to the cam 9b. The support sleeve 1 has multiple second mounting holes along its circumferential direction on its axial end face. These second mounting holes can be smooth holes or threaded holes. The connecting component 9a is interference-fitted with the second mounting holes, with an interference amount less than 0.1 mm. Alternatively, the connecting component 9a can be threadedly connected to the second mounting holes.

[0027] In this structure, since the center of cam 9b is offset from the center of connecting component 9a, when torque is applied to connecting component 9a to make it rotate, cam 9b rotates with connecting component 9a. Since the curve profiles of shift fork 4 and cam 9b have different swing angles at different contact points, the rotation angle of shift fork 4 and blade 3 is controlled by the structure of cam 9b, so that the opening and closing angle of blade 3 changes. Thus, the nozzle ring flow can be adjusted within a small range, so that an ideal flow can be obtained quickly, reducing the number of repeated tests. This design can compensate for the impact of manufacturing deviations and shorten the research and development cycle.

[0028] The aforementioned positioning component 9 can be used during the research and development process. Its main function is to locate the appropriate position of the shift fork 4, thereby determining the installation position of the third mounting hole on the actual product. Then, the pin 10 is used to install the shift fork into the third mounting hole for assembly on the actual product (e.g., ...). Figure 3 As shown in the diagram, in actual mass-produced products, the swing angle of the shift fork 4 is limited by pin 10. Of course, actual mass-produced products can also use... Figure 1 The first structure shown.

Claims

1. A variable cross-section nozzle ring of a turbocharger, comprising a support sleeve (1), a rotating shaft (2), a vane (3), a yoke (4), a yoke plate (5), a positioning member (9), a plurality of first mounting holes are arranged on the axial end surface of the support sleeve (1) along the circumference, each first mounting hole is in rotation fit with a rotating shaft (2), one end of each rotating shaft (2) is fixed with a vane (3), one end of each rotating shaft (2) is connected with one end of a yoke (4), the yoke plate (5) is annular, a plurality of assembly grooves (5a) are arranged on the inner circumferential surface of the yoke plate (5), the other end of each yoke (4) is matched with the assembly groove (5a), the positioning member (9) is fixed on the support sleeve (1), and the positioning member (9) is used for matching with the other end of the yoke (4), characterized in that, The support sleeve (1) further comprises a washer (6) and an axial limiting component (7), the washer (6) is sleeved on the axial limiting component (7), and a combination groove (8) is formed between the washer (6) and the axial limiting component (7); the axial limiting component (7) is fixed on the support sleeve (1), the dial plate (5) is in clearance fit with the combination groove (8), and the axial end faces of the dial plate (5) are in fit with the washer (6) and the axial limiting component (7) respectively.

2. A variable area nozzle ring for a turbocharger according to claim 1, wherein, The axial limiting component (7) comprises a pin shaft (7a) and a limiting disc (7b) for limiting the dial plate (5) in the axial direction, one end of the pin shaft (7a) is fixed on the limiting disc (7b), the other end of the pin shaft (7a) is fixed on the support sleeve (1), and the combination groove (8) is formed between the limiting disc (7b) and the washer (6).

3. A variable area nozzle ring for a turbocharger according to claim 1 wherein, The positioning component (9) comprises a connecting component (9a) and a cam (9b) for adjusting the swing angle of the adjusting yoke (4), one end of the connecting component (9a) is in fit with the support sleeve (1), and the other end of the connecting component (9a) is connected with the cam (9b).

4. A variable area nozzle ring for a turbocharger according to claim 3 wherein, The axial end face of the support sleeve (1) is provided with a plurality of second mounting holes in the circumferential direction, the connecting component (9a) is in interference fit with the second mounting hole, or the connecting component (9a) is in screw connection with the second mounting hole.

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