Flow regulating valve with novel axial positioning structure

Abstract

A flow regulating valve with a novel axial positioning structure comprises a valve body, a throttle shaft, a valve plate and an end cover, and is characterized in that the axial positioning structure is used for positioning the throttle shaft at the tail end and comprises a sliding bearing, a clamping ring, an on-shaft ring groove and a valve body stepped hole; the valve body stepped hole has the diameter corresponding to the throttle valve shaft, the clamping ring and the end cover. The sliding bearing is in interference fit with the stepped hole of the valve body and is connected with the tail part of the throttle valve shaft; the clamping ring is installed at the position surrounding the annular groove in the shaft, abuts against the shaft shoulder of the throttle shaft and is riveted and fixed to the valve body through the step flanging of the step hole of the valve body, and the difference value between the axial length of the annular groove in the shaft and the thickness of the clamping ring is the total axial movement amount. According to the throttle valve body assembly, the difficulty of gap adjustment can be reduced, the machining cost of the throttle valve body assembly is further reduced, and the system cost of gap adjustment equipment and the valve body assembly is reduced.

Description

Technical Field

[0001] The utility model relates to a gas flow control valve. Background Art

[0002] A throttle valve body assembly is usually provided in an internal combustion engine. It is arranged upstream of the intake manifold and connected to the intake duct to control the air flow supplied to the intake manifold. It directly controls the air flow entering the engine cylinder, and thus controls the engine speed and output power. The throttle valve body assembly is one of the main components of the intake control management system in modern engine management systems.

[0003] The common throttle valve body assembly on the market has a limiting feature of a limiting gasket. The throttle shaft of the throttle valve body assembly needs to be supported by bearings installed in the throttle mounting holes on both sides of the throat. Since the bearing itself has no axial limiting function, the position of the throttle shaft needs to be limited, and a certain amount of margin is required to avoid the valve plate from getting stuck or stuck at the throat of the valve body under special working conditions. The commonly used adjustment method on the market is to adjust the limiting gasket through a precision position adjustment device: a gasket is clamped in the slot on the throttle shaft, and is pressed on the housing through the bearing at the tail end of the throttle shaft. The gasket is between the housing and the bearing at the tail end of the throttle shaft, thereby achieving the purpose of limiting. To limit the position of the shaft, the precision position adjustment device is then used to act on both ends of the shaft, so that the gasket has a gap on both sides of the slot. In addition, the precision position adjustment device is mostly set close to the gear side. After the shaft, limiting gasket and bearing are installed, the gear and the shaft need to be fixed to achieve force transmission.

[0004] Figure 1 A shaft support method far from the gear end (referred to as the tail end) is shown, which uses a ball bearing to support the tail end. The inner ring of the ball bearing 16 is pressed on the inner ring of the ball bearing by a fixing clip 19, so that the shaft, the fixing clip and the ball bearing have no relative position, and a rigid connection is achieved. The end cover 17 and the valve body have an interference fit. The angular rotation of the relative position of the shaft and the valve body can be achieved by rotating the inner and outer ring balls of the ball bearing. Due to the product characteristics of the ball bearing itself, the clearance between the ball and the retainer and the inner and outer rings makes the axial relative displacement of the inner and outer rings of the bearing a movement space of 0.1mm-0.3mm, which can realize the displacement of the shaft 18 in the axial direction, realize the adjustment of the axial clearance during assembly, facilitate the assembly of product parts, and prevent the problem of jamming during the movement of the valve plate.

[0005] Therefore, there is an urgent need for a device to solve the above problems, thereby reducing the difficulty of gap adjustment and thus reducing the processing cost of the throttle valve body assembly, and reducing the system cost of the gap adjustment device and the valve body assembly. Utility Model Content

[0006] The purpose of the utility model is to provide a flow control valve with a novel axial positioning structure, which can reduce the difficulty of gap adjustment, thereby reducing the processing cost of the throttle valve body assembly, and reducing the system cost of the gap adjustment equipment and the valve body assembly.

[0007] To achieve the above-mentioned purpose, the utility model provides a flow regulating valve with a novel axial positioning structure, including a valve body, a throttle shaft, a valve plate and an end cover, wherein the axial positioning structure is used to position the throttle shaft at the rear end, and includes a sliding bearing, a clamping ring, an annular groove on the shaft and a valve body step hole; the valve body step hole has diameters corresponding to the throttle shaft, the clamping ring and the end cover respectively; the sliding bearing is interference fit with the valve body step hole to receive the rear end of the throttle shaft; the clamping ring is installed at a position around the annular groove on the shaft, abutting against the shoulder of the throttle shaft, and is riveted and fixed to the valve body by flanging the step of the valve body step hole, and the difference between the axial length of the annular groove on the shaft and the thickness of the clamping ring is the total axial movement.

[0008] As a preferred embodiment, the center hole of the clamping ring is a contoured structure, which can smoothly pass through the shaft head and sit on the step hole of the valve body. After the clamping ring is rotated at a certain angle and riveted to the valve body, the center hole of the clamping ring is clamped in the ring groove on the shaft to limit the throttle shaft from moving up and down in the axial direction; the center hole of the clamping ring is a clearance fit with the throttle shaft, and the outer circle of the clamping ring is a clearance fit with the step hole of the valve body.

[0009] As a preferred embodiment, the outer circle of the clamping ring is provided with an opening or notch for adjusting the angle by turning or using a contouring tool.

[0010] As a preferred method, when installing the clamping ring, a vacuum suction head is used to operate it. The vacuum suction head is used to imitate the clamping ring. The vacuum suction head is rotated to drive the clamping ring to rotate, and the clamping ring is misaligned with the flat position of the shaft head of the throttle shaft by 45°. The clamping ring realizes mechanical limiting of the default position.

[0011] As a preferred embodiment, the axial movement is 0.2 mm.

[0012] As a preferred embodiment, the flow regulating valve also includes a gear transmission structure, a position sensor and a magnetic structure, the gear transmission structure includes a motor gear, an intermediate gear and a fan gear; the motor gear is fixed on the output shaft of the motor; the intermediate gear is rotatably fixed on the throttle body, and the intermediate gear and the motor gear are meshed with each other; the fan gear is fixed at the end of the throttle shaft, and the fan gear and the intermediate gear are meshed with each other; the position sensor is arranged on the valve body; the top of the fan gear is provided with the magnetic structure that cooperates with the position sensor, and the position sensor feeds back the angular position of the fan gear to the engine electronic control unit in real time in the form of an electrical signal; the angular position of the fan gear is the angle of the throttle valve plate.

[0013] As a preferred embodiment, 3-6 flanging rivet points are punched at intervals of 60° to 120° along the circumferential direction to fix the clamping ring.

[0014] As a preferred embodiment, the collar is a flat sheet-like member having a central hole.

[0015] According to the inventor's research, the existing technology has the following disadvantages. The existing technical solution of using a ball bearing at the tail end is relatively expensive, and the inner and outer rings of the bearing need to be fixed separately to achieve the product function. If one of the fixed ends is loosened and displaced under durability, the axial movement will be out of control; the movement of the inner and outer rings of the ball bearing depends on the assembly clearance of the part itself, which has a certain degree of uncertainty. Even if the bearings are from the same batch, the tolerance range will be large and precise control cannot be achieved.

[0016] Another commonly used limiting feature in the market is a C-type gasket, which is adjusted by precision instruments. The specific method is as follows: a gasket is clamped in the slot on the throttle shaft, and is pressed on the housing through a needle bearing. The gasket is between the housing and the bearing to achieve the limiting purpose, so as to limit the position of the shaft, and then the precise position adjustment mechanism is used to act on both ends of the shaft so that the gasket has a gap on both sides of the slot. And this structure is mostly set close to the gear side, and it is necessary to fix the gear and the shaft after installing the shaft, limiting gasket and bearing to achieve force transmission. However, the above method has the following disadvantages: 1) Since the accuracy requirement for adjusting the gap is particularly high, a high-precision adjustment device is required, which leads to increased production and equipment costs; 2) The connection between gears and shafts is usually achieved by welding, riveting, thermal deformation and other processes during the assembly process. During the implementation of these processes, it is necessary to increase the process equipment, and such processes usually produce debris, particles and other pollutants, which affect the cleanliness of the gear side and the performance of the product. In severe cases, it is necessary to add corresponding dust prevention or dust removal equipment for cleaning; 3) Due to the difficulty of adjustment, it will lead to a high scrap rate. For the above reasons, it will lead to higher processing costs and system costs.

[0017] Compared with the prior art, the purpose of the utility model is to provide a flow control valve with a new axial positioning structure, which can reduce the difficulty of gap adjustment, thereby reducing the processing cost of the throttle valve body assembly, and reducing the system cost of the gap adjustment equipment and the valve body assembly. The utility model is used to solve the problems of the existing throttle valve structure being complex, difficult to manufacture and high in cost, and the need to use precision instruments to adjust the axial gap during the axial positioning process. The utility model is simple to operate, and the corresponding function can be achieved by adjusting the basic tooling with the help of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional schematic diagram of the shaft support method of the tail end in the prior art.

[0019] Figure 2 It is a cross-sectional view of the flow control valve of the utility model.

[0020] Figure 3 It is a front view of the flow control valve of the utility model.

[0021] Figure 4 It is an enlarged cross-sectional view of the axial positioning structure of the utility model.

[0022] Figure 5 An enlarged view showing the tail end with the end cap removed.

[0023] Figure 6 It is a side view of the flow control valve of the present invention with the end cover removed.

[0024] Figure 7 This is a view showing that the throttle of the flow control valve of the utility model is in a default position.

[0025] Figure 8 An enlarged view of the tail end showing the throttle in the default position after the end cover has been removed.

[0026] Fig. 9 This is a view showing that the throttle valve of the flow control valve of the utility model is in the minimum mechanical position.

[0027] Fig.10 An enlarged view of the tail end is shown with the end cover removed and the throttle in the minimum mechanical position.

[0028] Fig.11 This is a view showing that the throttle valve of the flow control valve of the utility model is in the maximum mechanical position.

[0029] Fig.12 An enlarged view is shown with the end cap removed and the throttle in the maximum mechanical position.

[0030] Fig.13This is a view of an example of a second structure of the clamp ring punching of the present invention.

[0031] Fig.14 This is a view of an example of the third structure of the clamp ring punching of the present invention. DETAILED DESCRIPTION

[0032] Hereinafter, an embodiment of a flow control valve with a novel axial positioning structure of the present invention will be described with reference to the accompanying drawings.

[0033] The embodiments described herein are specific embodiments of the present invention, which are used to illustrate the concept of the present invention, are explanatory and exemplary, and should not be interpreted as limiting the embodiments of the present invention and the scope of the present invention. In addition to the embodiments described herein, those skilled in the art can also adopt other obvious technical solutions based on the claims and the contents disclosed in the specification of this application, including any obvious replacement and modification of the embodiments described herein.

[0034] The drawings in this specification are schematic diagrams, which assist in explaining the concept of the present utility model and schematically show the shapes of various parts and their mutual relationships.

[0035] like Figure 2 , 3 As shown, a flow regulating valve with a novel axial positioning structure of the utility model includes a valve body 1, a throttle shaft 3, a valve plate 2, a motor 11, a gear transmission structure, an annular groove on the shaft, a reset torsion spring 6, a clamp ring 4, a valve plate screw 5, and a position sensor 8. During the adjustment process, the position sensor 8 can be electrically connected to an intelligent device or an ECU for position measurement and data transmission. The valve body 1 is a shell structure, and the top and bottom of the cavity in the shell are both provided with a rotation positioning structure of the throttle shaft 3. The top of the throttle shaft 3 is rotatably fixed on the rotation positioning structure. The valve plate 2 is fixedly mounted on the throttle shaft 3 by the valve plate screw 5. The position sensor 8 is fixed on the valve body 1. From the top rotation positioning structure vertically downward to the bottom of the cavity is the tail mounting position of the throttle shaft 3. A circular valve body 1 mounting hole is arranged around the tail mounting position. The tail of the throttle shaft 3 is provided with a clamp ring 4, and the clamp ring 4 is used to limit the axial positioning and axial movement clearance of the throttle shaft 3. The motor 11 is fixed on one side of the throttle body, and the motor 11 transmits the rotational force to the throttle shaft 3 through the gear transmission structure, thereby driving the rotation of the throttle shaft 3. The reset torsion spring 6 is sleeved on the throttle shaft 3 to control the reset of the throttle valve plate 2. The axial clearance adjustment device includes a rotation angle adjustment mechanism and a movement adjustment mechanism: the rotation angle adjustment mechanism is used to mechanically limit the rotation angle of the clamp ring 4. The movement adjustment mechanism is used to mechanically limit the movement of the clamp ring 4. More specifically, the position sensor 8 can be fixed on the valve body 1 by a clamp 15.

[0036] The working process of the flow control valve of the utility model is as follows. The motor 11 and the motor 11 gear 10 drive the intermediate gear 9, drive the sector gear 7 and the throttle shaft 3 connected to the sector gear 7, and finally make the throttle valve plate 2 connected to the throttle shaft 3 rotate, change the angle of the throttle valve plate 2 in the throttle throat 12, adjust the flow cross-sectional area of ​​the throat 12, so as to realize the control of the engine intake flow. In addition, a magnetic structure is arranged on the top of the sector gear 7, which cooperates with the position sensor 8. The position sensor 8 feeds back the angle position of the sector gear 7, that is, the angle of the throttle valve plate 2, to the engine electronic control unit in real time in the form of an electrical signal, thereby realizing the closed-loop control of the throttle.

[0037] The throttle valve usually has three typical working positions, the default position, the minimum mechanical position and the maximum mechanical position. During operation, the valve plate 2 and the shaft will rotate between the minimum mechanical position and the maximum mechanical position to realize the full function of the throttle valve product. The default position is a typical position between the minimum mechanical position and the maximum mechanical position angle, that is, when the motor 11 is not powered, the throttle valve plate 2 and the shaft will return to the force balance position under the action of the spring's reset force.

[0038] The minimum mechanical position is the position where the valve disc 2 closes the throat 12, that is, the valve disc 2 is substantially parallel to the flange plane, at an angle of 0 to 10 degrees. The maximum mechanical position is the position where the valve disc 2 fully opens the throat 12, that is, the valve disc 2 is substantially perpendicular to the flange plane, at an angle of 85 to 95 degrees.

[0039] The default position is usually between the minimum mechanical position and the maximum mechanical position angle. It is usually the position where the throttle can still perform some functions and limp home after the engine is powered off or fails. Depending on the application scenario, there are two default states, which can be divided into a normally open position (near 90°) and a normally closed position (close to the minimum mechanical position, with a slightly larger flow rate than the minimum mechanical position). The utility model is a flow control valve, which is close to the minimum mechanical position and has a slightly larger flow rate than the minimum mechanical position throat 12.

[0040] like Figure 7 , 8 As shown, in the default position, it is assumed that the angle of valve plate 2 is 14.5° (the angle between valve plate 2 and the flange plane).

[0041] like Fig. 9 , 10 As shown, the minimum mechanical position is when the valve plate 2 and the shaft rotate counterclockwise 10.5° from the default position to the minimum limit mechanical position, and the angle of the valve plate 2 is 4° (the angle between the valve plate 2 and the flange plane). At this time, the gas flow through the throttle throat 12 is the minimum.

[0042] like Fig.11 ,12 As shown in the figure, the maximum mechanical position is the maximum mechanical position reached when the valve plate 2 and the shaft rotate 79.5° clockwise from the default position, and the angle of the valve plate 2 is 94° (the angle between the valve plate 2 and the flange plane). When the valve plate 2 is perpendicular to the throat 12 position, and the angle of the valve plate 2 is 90°, the gas flow through the throttle throat 12 position is the maximum.

[0043] It can be seen from the figure that during operation, the valve plate 2 and the shaft will rotate between the minimum mechanical position and the maximum mechanical position. Based on the required space for the angle rotation of the valve plate 2, the full working condition rotation angle of the shaft will not exceed 90°, so the retaining ring 4 can be fully fixed in the shaft ring groove axially during the entire working process without causing the shaft to fall out, thereby realizing the full function of the throttle valve.

[0044] As a preferred embodiment, the gear transmission structure includes a motor gear, an intermediate gear 9, and a sector gear 7. The motor 11 gear 10 is fixed to the output shaft of the motor 11. The intermediate gear 9 is rotatably fixed to the throttle body, and the intermediate gear 9 and the motor 11 gear 10 are meshed with each other. The sector gear 7 is fixed to the end of the throttle shaft 3, and the sector gear 7 and the intermediate gear 9 are meshed with each other.

[0045] As a preferred embodiment, the axial positioning valve structure further includes a magnetic structure. A magnetic structure that cooperates with a position sensor 8 is provided on the top of the sector gear 7, and the magnetic structure feeds back the angle position of the sector gear 7 to the engine electronic control unit in real time in the form of an electrical signal. The angle position of the sector gear 7 is the angle of the throttle valve plate 2.

[0046] In this embodiment, the clamping ring 4 is a flat sheet-shaped clamping ring 4, whose inner hole diameter is larger than the shaft diameter of the tail of the throttle shaft 3, whose outer diameter is smaller than the groove diameter of the ring groove, and whose thickness is smaller than the groove width of the ring groove.

[0047] As a preferred embodiment, the return torsion spring 6 is sleeved on the throttle shaft 3 , and one end of the return torsion spring 6 is fixed on the throttle body, and the other end is fixed on the sector gear 7 .

[0048] As a preferred embodiment, the rotation positioning structure includes a top rotation positioning structure and a bottom rotation positioning structure, wherein the top rotation positioning structure includes a top mounting hole and a top bearing 13. The bottom rotation positioning structure includes a valve body 1 mounting hole and a bottom bearing 14. The top mounting hole and the valve body 1 mounting hole are respectively arranged at the top and bottom ends of the throat 12 of the valve body 1, and the top bearing 13 is arranged in the top mounting hole, and the bottom bearing 14 is arranged in the valve body 1 mounting hole. The throttle shaft 3 is supported by two bearings in the mounting holes at both ends of the valve body throat 12, that is, the top and tail ends of the throttle shaft 3 are supported by the top bearing 13 and the bottom bearing 14 respectively. The needle bearing 13 is close to the gear side, and the sliding bearing 14 is close to the tail end. In the tail end ring groove of the throttle shaft 2, a clamping ring 4 is provided to limit the axial positioning structure and axial movement clearance of the throttle shaft 2, and the clamping ring 4 is fixed in the mounting hole of the valve body 1.

[0049] Figure 4 It is an enlarged cross-sectional view of the axial positioning structure of the utility model. Figure 5 The axial positioning structure of the flow regulating valve of the utility model is used to position the throttle shaft 3 at the tail end, and includes a sliding bearing 14, a clamping ring 4, an annular groove on the shaft and a valve body step hole.

[0050] The valve body step hole has diameters corresponding to the throttle shaft 3, the clamping ring 4 and the end cover respectively, and is in a multi-layer step shape with multi-layer steps for support.

[0051] The sliding bearing 14 is interference fit with the step hole of the valve body, and receives the tail of the throttle shaft 3;

[0052] The clamping ring 4 is installed around the ring groove on the shaft, against the shoulder of the throttle shaft 3, and is riveted and fixed to the valve body 1 by flanging the step of the step hole of the valve body. The difference between the axial length of the ring groove on the shaft and the thickness of the clamping ring 4 is the total axial movement, that is, the allowable axial displacement.

[0053] The collar 4 is a flat sheet with a central hole, and the central hole is a profiled structure, which can smoothly pass through the shaft head, sit on the shaft annular groove position, and be stuck in the shaft annular groove to limit the throttle shaft 3 from moving up and down in the axial direction. The profiled structure imitates the circumferential outer contour of the shaft head, so that it can pass through the shaft head and be positioned at the shaft annular groove, and can be stuck in the two opposite groove walls of the shaft annular groove by rotating the angle after passing through the shaft head.

[0054] The center hole of the clamp ring 4 and the throttle shaft 3 are clearance-fitted, and the outer circle of the clamp ring 4 and the step hole of the valve body are clearance-fitted.

[0055] The outer circle of the clamping ring 4 is provided with an opening or notch for adjusting the angle by turning or using a contouring tool.

[0056] After the clamp ring 4 is seated, it needs to rotate within a specific angle range. Due to the working characteristics of the throttle, the shaft rotation angle will not exceed 90°, so the clamp ring 4 and the shaft can be completely axially fixed during the entire working process without causing the shaft to come out.

[0057] See also Figure 6 When installing the collar 4, a vacuum suction head is used to operate it. The vacuum suction head is used to copy the collar shape. The vacuum suction head rotates, and the collar rotates. The collar is misaligned with the flat position of the throttle shaft 3 by 45°, and the collar 4 realizes the default position mechanical limit. Since the angle between the minimum mechanical position and the default position is less than 45°, the mechanical limit can also be realized.

[0058] Furthermore, when installing the clamp ring 4, the step edge of the step hole of the valve body is flanged to fix the clamp ring 4 in the current position. From the small end of the shaft head, the working rotation direction of the shaft is clockwise, and the rotation angle of the whole working process is about 90°. The overlap angle between the flat position of the clamp ring and the flat position of the shaft head is 180°-45°=135°>90°, so mechanical limit can be achieved in the whole process.

[0059] After the angle of the clamp ring 4 is set, multiple flange rivet points need to be punched on the valve body 1 to press and fix the clamp ring 4 on the valve body 1, thereby achieving a rigid connection between the clamp ring 4 and the valve body 1. In this embodiment, the valve body 1 is made of aluminum alloy material.

[0060] The retaining ring 4 needs to be installed in the annular groove at the tail end of the shaft. The allowable axial displacement (axial movement) is set by the height difference between the annular groove and the retaining ring 4. The size of the axial displacement can be accurately controlled and set by the size and precision of the annular groove height and the height of the retaining ring 4. For example, when the height of the annular groove on the shaft is 1.2mm and the thickness of the retaining ring 4 is 1.0mm, after the retaining ring 4 is installed, the axial movement clearance is the difference between the two, 0.2mm.

[0061] The end cover is used to close the space at the rear of the valve body, that is, to close the mounting hole of the throttle shaft 3, and can adopt a variety of structural forms as long as it can meet the sealing function. In this embodiment, it adopts a bow-shaped structure, the edge has a certain elasticity, and the whole has a certain axial thickness, abuts against the step of the step hole of the valve body and fits tightly with the hole wall.

[0062] Modification 1

[0063] like Fig.13As shown, compared with the previous embodiment, the difference of variation 1 is that three notches are arranged in the circumferential direction of the clamp ring 4, and five rivet points are uniformly punched in the circumferential direction along the annular groove on the upper side of the clamp ring 4 by means of embossing. The notch of the clamp ring 4 and the embossing position are avoided. Such a stamping position can ensure more reliable installation and effectively prevent the clamp ring 4 from loosening or rotating at an angle. In addition, the notch of the clamp ring 4 is convenient for the profiling tool to position, drive the clamp ring 4 to rotate and then rotate to a specified angle to realize the rotation positioning function. The utility model can effectively prevent the shaft from loosening during rotation and realize axial positioning.

[0064] Modification 2 Fig.14 As shown, compared with the previous embodiment, the difference of variation 2 is that the collar 4 is in the form of a C-shaped opening, and the stamping positions are 3-6, which can be set as needed according to the process requirements, and the opening position and the stamping position are avoided. More and more uniform stamping positions can ensure more reliable installation. This can effectively prevent the collar 4 from loosening or rotating at an angle. In addition, the opening position of the collar 4 is convenient for the profiling tool to position and drive the collar 4 to rotate, and then rotate to a specified angle to realize the rotation positioning function. The utility model can also prevent the shaft from loosening during rotation and realize axial positioning.

[0065] Compared with the prior art, the purpose of the present invention is to provide a flow control valve with a novel axial positioning structure, which can reduce the difficulty of gap adjustment, thereby reducing the processing cost of the throttle valve body 1 assembly, and reducing the system cost of the gap adjustment device and the valve body 1 assembly. The present invention is used to solve the problems of the existing throttle valve having a complex structure, high manufacturing difficulty and high cost, and requiring the use of precision instruments to adjust the axial gap during the axial positioning process. The present invention is simple to operate, and the corresponding function can be achieved by adjusting the basic tooling with the help of the present invention.

Claims

1. A flow control valve with a novel axial positioning structure, comprising a valve body, a throttle shaft, a valve plate and an end cover, It is characterized in that The axial positioning structure is used to position the throttle shaft at the rear end, and includes a sliding bearing, a clamping ring, a ring groove on the shaft, and a valve body step hole; The valve body step hole has diameters corresponding to the throttle shaft, the collar and the end cover respectively; The sliding bearing is interference-fitted with the step hole of the valve body to receive the tail of the throttle shaft; The clamping ring is installed around the ring groove on the shaft, against the shoulder of the throttle shaft, and is riveted to the valve body by flanging the step of the step hole of the valve body. The difference between the axial length of the ring groove on the shaft and the thickness of the clamping ring is the total axial movement.

2. The flow control valve with a novel axial positioning structure according to claim 1 is characterized in that: The center hole of the clamp ring is a contoured structure, which can smoothly pass through the shaft head and sit on the step hole of the valve body. After the clamp ring is rotated to a certain angle and riveted to the valve body, the center hole of the clamp ring is clamped on the annular groove on the shaft to limit the throttle shaft from moving up and down in the axial direction. The center hole of the clamp ring and the throttle shaft are in clearance fit, and the outer circle of the clamp ring and the step hole of the valve body are in clearance fit.

3. The flow control valve with a novel axial positioning structure according to claim 1 is characterized in that: The outer circle of the clamping ring is provided with an opening or a notch for adjusting the angle by shifting or using a contouring tool.

4. The flow control valve with a novel axial positioning structure according to claim 2 or 3, characterized in that: When installing the clamping ring, a vacuum suction head is used to operate the clamping ring. The vacuum suction head is rotated to drive the clamping ring to rotate, and the clamping ring is misaligned with the flat position of the shaft head of the throttle shaft by 45°, so that the clamping ring realizes mechanical limiting in the default position.

5. The flow control valve with a novel axial positioning structure according to claim 1 is characterized in that: The axial movement is 0.2 mm.

6. The flow control valve with a novel axial positioning structure according to claim 1, characterized in that: The flow control valve also includes a gear transmission structure, a position sensor and a magnetic structure. The gear transmission structure includes a motor gear, an intermediate gear, and a sector gear; The motor gear is fixed on the output shaft of the motor; The intermediate gear is rotatably fixed on the throttle body, and the intermediate gear is meshed with the motor gear; The sector gear is fixed to the end of the throttle shaft, and the sector gear and the intermediate gear are meshed with each other; The position sensor is arranged on the valve body; The top of the sector gear is provided with the magnetic structure cooperating with the position sensor, and the position sensor feeds back the angular position of the sector gear to the engine electronic control unit in real time in the form of an electrical signal; the angular position of the sector gear is the angle of the throttle valve plate.

7. The flow control valve with a novel axial positioning structure according to claim 1 is characterized in that: 3-6 flanging rivet points are punched at intervals of 60° to 120° along the circumferential direction to fix the clamp ring.

8. The flow control valve with a novel axial positioning structure according to claim 1, characterized in that: The collar is a flat sheet-like member with a central hole.

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