Throttle valve stepping motor flow testing device and system and adjusting head manufacturing method
Through CNC machining and precision-designed flow test systems, the high cost and long cycle problems of traditional stepper motor regulating heads have been solved, efficient and economical testing of throttle development has been achieved, and the reliability and versatility of flow control have been improved.
Patent Information
- Application Number
- CN202510959305.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-11
- Publication Date
- 2025-09-19
AI Technical Summary
The production cost of traditional stepper motor regulating heads is high and the production cycle is long, which affects the progress of throttle development.
The regulating head is made by CNC processing. Combined with the design of the test valve seat, fixed seat and adjusting screw, flow test is carried out through the flow adjustment hole and intake duct. Sealing rings and springs are used to eliminate thread clearance. The axis coaxiality is calibrated with a dial indicator to construct a throttle stepper motor flow test system.
The manufacturing cost of the regulating head is reduced, the development cycle is shortened, the accuracy and reliability of the flow test are improved, and the versatility of the device is expanded.
Smart Images
Figure CN120668229A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of throttle valves, and relates to a throttle valve stepping motor flow rate testing device and system, and a method for manufacturing a regulating head. Background Art
[0002] The stepper motor for the throttle valve plays a crucial role in internal combustion engines, precisely controlling the amount of air intake during engine startup and idling. Vehicles of varying displacements require different idle flow curve characteristics, and the output characteristics of this idle flow curve are directly determined by the outer contour of the stepper motor's regulating head.
[0003] Traditional stepper motor control heads are typically made of PPS resin and manufactured through an injection molding process. They are then assembled into throttle valve assemblies and tested using a throttle integrated flow test bench to verify that their idle flow output characteristics meet customer requirements. During the actual development process, to meet the customer's specific idle flow output characteristic curve, the outer contour of the stepper motor control head requires multiple revisions and tests based on test results from design calculations. Using injection molding presents two major challenges: high production costs, as each revision requires remaking the injection mold; and long production cycles, often several weeks in total, resulting in a lengthy design and manufacturing process. These two issues significantly impacted project development progress, increasing both cost and time.
[0004] Therefore, how to test the flow characteristics of the stepper motor more efficiently and economically during the throttle development stage and solve the technical problems of high cost and long production cycle of the stepper motor regulating head during the development, verification and testing stage are the research focuses of technical personnel in this field. Summary of the Invention
[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a throttle stepper motor flow testing device and system and a regulating head manufacturing method. The present invention can test the flow characteristics of the stepper motor more efficiently and economically during the throttle development stage, and solve the technical problems of high cost and long manufacturing cycle of the stepper motor regulating head during the development, verification and testing stage; at the same time, it can save the development cycle of the throttle project.
[0006] The technical solution of the present invention is achieved as follows: A throttle stepper motor flow test device, a test valve seat, a fixed seat and an adjusting screw, the test valve seat has a accommodating cavity for accommodating an adjusting head to be tested, one end of the test valve seat is open, thereby connecting the outside and the accommodating cavity; an air inlet is provided at the bottom of the other end of the test valve seat, and a flow regulating hole is opened on the accommodating cavity at the end corresponding to the air inlet, the flow regulating hole is connected with the air inlet through the air inlet duct, and an air outlet is provided at the bottom of the test valve seat corresponding to the accommodating cavity; the fixed seat is fixedly set at the open end of the test valve seat to close the open end of the test valve seat, and at the same time, a threaded hole and a through hole are provided in the fixed seat along the longitudinal direction of the fixed seat, one end of the adjusting screw passes through the threaded hole and the through hole in turn and extends into the accommodating cavity and is threadedly connected to the adjusting head to be tested, so that the distance between the adjusting head to be tested and the flow regulating hole can be adjusted by the adjusting screw; the adjusting screw and the flow regulating hole are coaxially arranged.
[0007] Furthermore, the adjusting screw and the through hole are clearance-matched, and the clearance is 0.05-0.10 mm.
[0008] Furthermore, a first countersunk hole and a second countersunk hole are provided at the end of the through hole away from one end of the threaded hole of the fixing seat. The second countersunk hole is located outside the first countersunk hole, and the outer diameter of the second countersunk hole is larger than that of the first countersunk hole. A first sealing ring is provided in the first countersunk hole, and an annular pressure block is provided in the second countersunk hole. The pressure block is interference fit with the second countersunk hole and is used to press the first sealing ring to ensure the sealing effect.
[0009] Furthermore, a spring is sleeved on the adjusting screw between the pressing block and the adjusting head to be measured, and washers are sleeved on the adjusting screws at both ends of the spring.
[0010] Furthermore, a boss is provided at one end of the adjusting screw for axially limiting the adjusting head to be tested and the adjusting screw.
[0011] Furthermore, a second sealing ring is provided between the fixing seat and the test valve seat.
[0012] The present invention provides a throttle stepper motor flow testing system, comprising the throttle stepper motor flow testing device described above, and also comprising a throttle assembly and a throttle comprehensive flow testing bench, wherein the throttle assembly is arranged on the throttle comprehensive flow testing bench, and the throttle assembly has a bypass air outlet and a bypass air inlet, the testing device is fixed to the throttle assembly, and the air inlet and air outlet of the testing device correspond to the bypass air outlet and bypass air inlet of the throttle assembly respectively, and a third sealing ring is provided between the testing device and the throttle assembly.
[0013] Furthermore, it also includes a dial indicator, the accuracy of which is greater than or equal to 0.01 mm, the dial indicator is located on the side of the adjusting screw and the side head axis of the dial indicator is coaxially arranged with the axis of the adjusting screw, and the coaxiality is less than or equal to 0.01 mm.
[0014] The present invention also provides a method for manufacturing a throttle stepper motor regulating head, which specifically includes the following steps: Step S1: Calculate the outer contour of the regulating head to be tested according to the flow design requirements of the stepping motor, and then use CNC processing to obtain the regulating head to be tested; Step S2: Assemble the regulating head to be tested into the test device, then assemble the test device onto the throttle assembly, and then assemble the throttle assembly onto the throttle integrated flow test bench, thereby obtaining the throttle stepper motor flow test system according to claim 8, and finally perform the test. The specific test method is as follows: Step S2.1: Calculate the distance the adjusting screw needs to retract each step based on the step size specified in the stepper motor specification. Step S2.2: Manually adjust the adjusting screw so that it rotates and advances toward the regulating head to be tested, and the regulating head contacts the flow regulating hole. Then, manually adjust the adjusting screw according to the distance to be withdrawn at each step calculated in Step S2.1. After the adjusting screw is in place, operate the throttle integrated flow test bench to reach the specified negative pressure. Record the negative pressure and flow at this time. Then, complete the test and generate a flow curve characteristic diagram in this way. Step S2.3: Compare the flow curve characteristic diagram generated in step S2.2 with the target flow curve characteristic diagram. If they are within the tolerance range, proceed to step S4; otherwise, proceed to step S3. Step S3: redesigning the outer contour of the regulating head to be tested based on a combination of theoretical calculation and actual measurement, and then repeating steps S1 and S2 until the generated flow curve characteristic diagram is within the tolerance range; Step S4: using an injection molding process to manufacture the regulating head.
[0015] Furthermore, in step S1, copper H62 or 12L14 is used as raw material and the regulating head is manufactured by CNC processing.
[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention utilizes CNC machining to manufacture the regulating head, eliminating the need for injection molds. The material of choice is easily machined metals such as copper H62 or free-cutting steel 12L14, effectively reducing production costs and shortening development cycles for the regulating head under test. Furthermore, the test valve seat is identical in structure to the actual throttle body assembly, reducing repeated corrections caused by measurement errors due to equipment differences, further accelerating project development.
[0017] 2. By placing a spring between the regulating head to be tested and the pressure block, this invention effectively eliminates axial thread clearance, preventing the regulating head from shifting due to clearance and ensuring more accurate flow test data. Combined with a dial indicator to calibrate the coaxiality of the adjusting screw axis (≤0.01mm), and the standardized design of the mounting base and sealing ring, this ensures tightness during the test and data stability. The generated flow curve characteristic diagram closely matches the target curve tolerance range, significantly improving the reliability of idle flow control.
[0018] 3. The measuring device of the present invention is suitable for flow testing of throttle stepper motors of 50cc to 700cc displacement vehicles. After the device is expanded, it can also be directly applied to the development stage testing of automobile throttle stepper motors, with good versatility and scalability. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 -Schematic diagram of the structure of the testing device of the present invention.
[0020] Figure 2-Figure 1 AA cross-section diagram.
[0021] Figure 3 -Assembly diagram of the test device, throttle assembly and intake pipe Figure 1 .
[0022] Figure 4 -Assembly diagram of the test device, throttle assembly and intake pipe Figure 2 .
[0023] Figure 5 -Assembly diagram of the test device, throttle assembly and intake pipe Figure 3 .
[0024] Among them: 100-test device; 1-test valve seat; 2-fixed seat; 3-adjusting screw; 4-adjusting head to be tested; 5-air inlet; 6-flow adjustment hole; 7-air outlet; 8-spring; 9-gasket; 10-pressure block; 11-first sealing ring; 12-second sealing ring; 13-through hole; 14-threaded hole; 200-throttle assembly; 300-test base. DETAILED DESCRIPTION
[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0026] See also Figure 1 and Figure 2A throttle stepper motor flow test device 100 for an internal combustion engine comprises a test valve seat 1, a fixed seat 2 and an adjusting screw 3. The test valve seat 1 has a receiving cavity for receiving an adjusting head 4 to be tested. One end of the test valve seat 1 is open, thereby connecting the outside world and the receiving cavity. An air inlet 5 is provided at the bottom of the other end of the test valve seat 1, and a flow regulating hole 6 is provided on the receiving cavity at the end corresponding to the air inlet 5. The flow regulating hole 6 is connected to the air inlet 5 through an air inlet duct, and an air outlet 7 is provided at the bottom of the test valve seat corresponding to the receiving cavity. The fixing seat 2 is fixedly arranged on the open end of the test valve seat 1 to close the open end of the test valve seat 1. At the same time, a threaded hole 14 and a through hole 13 are provided in the fixing seat 2 along the longitudinal direction. One end of the adjusting screw 3 passes through the threaded hole 14 and the through hole 13 in turn and extends into the accommodating cavity and is inserted into the threaded hole of the adjusting head 4 to be tested and is threadedly connected to the adjusting head 4 to be tested, so that the distance between the adjusting head 4 to be tested and the flow adjustment hole 6 can be adjusted by the adjusting screw 3, thereby completing the test of the stepping motor flow; the adjusting screw 3 and the flow adjustment hole 6 are coaxially arranged.
[0027] The threaded hole in the stepper motor's adjustment head has a 3M thread, which can only be achieved through injection molding. However, using this test device, during the throttle development phase, the adjustment head can be CNC-machined to a 4M thread, eliminating the need for an injection mold and effectively reducing production costs and development cycles.
[0028] In order to reduce repeated corrections caused by measurement errors due to equipment differences, the test valve seat (internal structures such as the air inlet, air outlet, flow adjustment hole, etc.) should be consistent with the actual structure of the throttle body assembly.
[0029] During specific implementation, the adjusting screw 3 and the through hole 13 are clearance-matched, and the clearance is 0.05-0.10 mm.
[0030] Here, if the gap between the adjusting screw and the through hole is too large, the radial swing amplitude of the adjusting screw will be too large during the working process, which will eventually lead to excessive deviation of the test data.
[0031] During specific implementation, a first countersunk hole and a second countersunk hole are provided at the end of the through hole 13 of the fixing seat 2 away from the threaded hole 14. The second countersunk hole is located outside the first countersunk hole, and the outer diameter of the second countersunk hole is larger than that of the first countersunk hole. A first sealing ring 11 is provided in the first countersunk hole, and an annular pressure block 10 is provided in the second countersunk hole. The pressure block 10 is interference fit with the second countersunk hole and is used to press the first sealing ring 11 to ensure the sealing effect.
[0032] In a specific implementation, a spring 8 is sleeved on the adjusting screw 3 between the pressing block 10 and the adjusting head 4 to be measured, and washers 9 are sleeved on the adjusting screw 3 at both ends of the spring 8 .
[0033] Here, a spring placed between the pressure block and the adjusting head under test effectively eliminates the axial clearance between the adjusting screw and the fixing base during testing, thereby reducing measurement errors. Washers are also placed at both ends of the spring to prevent damage to the adjusting head and other related components from the spring's end faces.
[0034] In a specific implementation, a boss is provided at one end of the adjusting screw 3 for axially limiting the adjusting head to be tested and the adjusting screw 3 .
[0035] The boss here is a certain length away from the end of the adjusting screw. When the adjusting screw is inserted into the threaded hole of the adjusting head to be tested and threadedly connected to the adjusting head to be tested, the boss is tightly attached to the end of the threaded hole of the adjusting head to be tested for axial limitation.
[0036] In specific implementation, a second sealing ring 12 is provided between the fixed seat 2 and the test valve seat 1, thereby effectively ensuring the sealing between the fixed seat and the test valve seat. In this embodiment, the fixed seat is partially inserted into the test valve seat, and a pressure plate is provided on the outside of the fixed seat. The pressure plate and the test valve seat are fixed with screws, thereby fixing the fixed seat to the test valve seat.
[0037] See also Figures 1 to 5 A throttle stepper motor flow test system for an internal combustion engine includes the throttle stepper motor flow test device 100 for an internal combustion engine described above, and also includes a throttle assembly 200 and a test base 300 of a throttle comprehensive flow test bench. The throttle assembly 200 is arranged on the throttle comprehensive flow test bench. The throttle assembly 200 has a bypass air outlet and a bypass air inlet. The test device 100 is fixed to the throttle assembly 200 and the air inlet 5 and the air outlet 7 of the test device 100 correspond to the bypass air outlet and the bypass air inlet of the throttle assembly 200 respectively, and a third sealing ring is provided between the test device 100 and the throttle assembly 200 to ensure sealing.
[0038] The throttle comprehensive flow test bench used in this embodiment is the throttle comprehensive performance test bench S7802.
[0039] In a specific implementation, a dial indicator (not shown) with an accuracy of 0.01 mm or greater is included. The dial indicator is located on the side of the adjusting screw, with the axis of the dial indicator's side head coaxially aligned with the axis of the adjusting screw, with a coaxiality of 0.01 mm or less. Before testing, the dial indicator is adjusted to align the adjusting screw and the axis of the dial indicator's side head coaxially, with the coaxiality calibrated to within 0.01 mm to effectively ensure measurement accuracy.
[0040] A method for manufacturing a throttle stepper motor regulating head specifically comprises the following steps: Step S1: Calculate the outer contour of the regulating head to be tested according to the flow design requirements of the stepper motor, then select materials with good processing characteristics, such as copper H62, free-cutting steel 12L14, etc., and use CNC processing to obtain the regulating head to be tested; Step S2: Assemble the regulating head to be tested into the test device, then assemble the test device onto the throttle assembly, and then assemble the throttle assembly onto the test base of the throttle integrated flow test bench, thereby obtaining the throttle stepper motor flow test system described above, and finally perform the test. The specific test method is as follows: Step S2.1: Calculate the distance the adjusting screw needs to retract each step based on the step size specified in the stepper motor specification. For example, if the stepper motor specification states 0.03mm / step, test every 5 steps until 200 steps (i.e., 0step, 5step, 10step, 15step, ... 200step). Calculate the distance corresponding to every 5 steps based on the number of test steps and the step distance (e.g., 5step * 0.03mm = 0.15mm, 10step * 0.03mm = 0.3mm; the same calculation applies to different step numbers). Similarly, calculate the distance corresponding to every 5 steps.
[0041] Step S2.2: Manually adjust the adjusting screw so that it rotates and advances toward the regulating head to be tested, and the regulating head to be tested contacts the flow control hole. This ensures that in the initial position, the regulating head to be tested is in contact with the flow control hole on the test valve seat. Then, manually adjust the adjusting screw according to the distance to be withdrawn at each step calculated in Step S2.1, while constantly observing the value on the dial indicator. After the adjusting screw is in place, operate the throttle integrated flow test bench to reach a specified negative pressure (e.g., -26.7 kPa, different customers have different requirements). Record the negative pressure and flow at this time. Then, complete the test and generate a flow curve characteristic diagram in this way. Step S2.3: Compare the flow curve characteristic diagram generated in step S2.2 with the target flow curve characteristic diagram. If they are within the tolerance range, proceed to step S4; otherwise, proceed to step S3. Step S3: redesigning the outer contour of the regulating head to be tested based on a combination of theoretical calculation and actual measurement, and then repeating steps S1 and S2 until the generated flow curve characteristic diagram is within the tolerance range; Step S4: using an injection molding process to manufacture the regulating head.
[0042] Finally, it should be noted that the above embodiments of the present invention are merely examples for illustrating the present invention and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations and modifications can be made based on the above description. It is not possible to enumerate all embodiments here. Any obvious variations or modifications arising from the technical solution of the present invention remain within the scope of protection of the present invention.
Claims
1. A throttle stepper motor flow test device, characterized in that: A test valve seat, a fixed seat and an adjusting screw, the test valve seat has a accommodating cavity for accommodating the adjusting head to be tested, and one end of the test valve seat is open, so as to connect the outside and the accommodating cavity; an air inlet is provided at the bottom of the other end of the test valve seat, and a flow regulating hole is opened on the accommodating cavity at the end corresponding to the air inlet, the flow regulating hole is connected with the air inlet through the air inlet duct, and an air outlet is provided at the bottom of the test valve seat corresponding to the accommodating cavity; the fixed seat is fixedly set at the open end of the test valve seat to close the open end of the test valve seat, and at the same time, a threaded hole and a through hole are provided in the fixed seat along the longitudinal direction of the fixed seat, one end of the adjusting screw passes through the threaded hole and the through hole in turn and extends into the accommodating cavity and is threadedly connected to the adjusting head to be tested, so that the distance between the adjusting head to be tested and the flow regulating hole can be adjusted by the adjusting screw; the adjusting screw and the flow regulating hole are coaxially arranged.
2. A throttle stepper motor flow rate testing device according to claim 1, characterized in that: The adjusting screw and the through hole are matched with each other with a clearance of 0.05-0.10 mm.
3. A throttle stepper motor flow rate testing device according to claim 1 or 2, characterized in that: A first countersunk hole and a second countersunk hole are provided at the end of the through hole away from one end of the threaded hole of the fixing seat. The second countersunk hole is located outside the first countersunk hole, and the outer diameter of the second countersunk hole is larger than that of the first countersunk hole. A first sealing ring is provided in the first countersunk hole, and an annular pressure block is provided in the second countersunk hole. The pressure block is interference fit with the second countersunk hole and is used to press the first sealing ring to ensure the sealing effect.
4. A throttle stepper motor flow rate testing device according to claim 3, characterized in that: A spring is sleeved on the adjusting screw between the pressing block and the adjusting head to be measured, and washers are sleeved on the adjusting screws at both ends of the spring.
5. The throttle stepper motor flow rate testing device according to claim 1, characterized in that: The one end of the adjusting screw is provided with a boss for axially limiting the adjusting head to be tested and the adjusting screw.
6. A throttle stepper motor flow rate testing device according to claim 1, characterized in that: A second sealing ring is provided between the fixed seat and the test valve seat.
7. A throttle stepper motor flow test system, characterized in that: It comprises a throttle stepper motor flow test device as described in any one of claims 1 to 6, and also comprises a throttle assembly and a throttle comprehensive flow test bench, the throttle assembly is arranged on the throttle comprehensive flow test bench, the throttle assembly has a bypass air outlet and a bypass air inlet, the test device is fixed to the throttle assembly and the air inlet and air outlet of the test device correspond to the bypass air outlet and bypass air inlet of the throttle assembly respectively, and a third sealing ring is provided between the test device and the throttle assembly.
8. A throttle stepper motor flow rate testing system according to claim 7, characterized in that: It also includes a dial indicator, the accuracy of which is greater than or equal to 0.01 mm. The dial indicator is located on the side of the adjusting screw and the side head axis of the dial indicator is coaxially arranged with the axis of the adjusting screw, and the coaxiality is less than or equal to 0.01 mm.
9. A method for manufacturing a throttle stepper motor regulating head, characterized in that: The specific steps include: Step S1: Calculate the outer contour of the regulating head to be tested according to the flow design requirements of the stepping motor, and then use CNC processing to obtain the regulating head to be tested; Step S2: Assemble the regulating head to be tested into the test device, then assemble the test device onto the throttle assembly, and then assemble the throttle assembly onto the throttle integrated flow test bench, thereby obtaining the throttle stepper motor flow test system according to claim 8, and finally perform the test. The specific test method is as follows: Step S2.1: Calculate the distance the adjusting screw needs to retract each step based on the step size specified in the stepper motor specification. Step S2.2: Manually adjust the adjusting screw so that it rotates and advances toward the regulating head to be tested, and the regulating head contacts the flow regulating hole. Then, manually adjust the adjusting screw according to the distance to be withdrawn at each step calculated in Step S2.
1. After the adjusting screw is in place, operate the throttle integrated flow test bench to reach the specified negative pressure. Record the negative pressure and flow at this time. Then, complete the test and generate a flow curve characteristic diagram in this way. Step S2.3: Compare the flow curve characteristic diagram generated in step S2.2 with the target flow curve characteristic diagram. If they are within the tolerance range, proceed to step S4; otherwise, proceed to step S3. Step S3: redesigning the outer contour of the regulating head to be tested based on a combination of theoretical calculation and actual measurement, and then repeating steps S1 and S2 until the generated flow curve characteristic diagram is within the tolerance range; Step S4: using an injection molding process to manufacture the regulating head.
10. The method for manufacturing a throttle stepper motor regulating head according to claim 9, characterized in that: In step S1, copper H62 or 12L14 is used as raw material and the regulating head is manufactured by CNC processing.