Release valve fuel gear motor axial play measuring tool

Abstract

The utility model discloses a release valve fuel gear motor axial displacement measurement frock, include: base, install hole and let position cavity are set up on it, the end of connecting pipe stretches into and forms the expansion friction connection with the inside wall of motor shaft, connecting pipe is worn in let position cavity, and connecting pipe end part is provided with expansion petal, each expansion petal is shaped to have drive slope, drive rod is worn in the inside of connecting pipe, wherein, when drive rod moves in connecting pipe along the axial movement, can drive each expansion petal and expand deformation or contract to the inside along the radial outward, to abut or separate from the inside wall of motor shaft, when connecting pipe and motor shaft pass through expansion petal and lock solid, along the axial movement frock can be measured and take the axial displacement of motor shaft through measuring instrument. The frock can be connected with motor shaft stably and reliably, thereby provides the installation basis for measuring instrument, and the possible loosening risk of measuring instrument is reduced to a certain extent.

Description

Technical Field

[0001] This utility model relates to the field of precision mechanical measurement technology, and in particular to a tooling for measuring the axial movement of a fuel gear motor in a release valve. Background Technology

[0002] In the field of aero-engine and its accessory maintenance, there are strict technical specifications for the assembly precision of core moving components. As a key actuating component in the engine control system, the axial assembly clearance of the internal gear transmission pair of the release valve fuel gear motor, i.e., the axial runout, is a critical parameter affecting the overall operational stability and reliability of the engine. Maintenance technical procedures typically require that this runout be controlled within a micrometer-level tolerance range to ensure that the motor maintains good meshing characteristics and sealing performance during long-term service.

[0003] Currently, the measurement of axial movement in such built-in geared motors typically requires completion of the housing assembly. The main technical challenge lies in applying precise axial excitation to the internal rotating shaft while simultaneously detecting its micron-level displacement response, all while maintaining a stable and fixed motor housing. Existing measurement methods largely rely on operators temporarily assembling general-purpose tools, lacking dedicated integrated tooling for this specific operating condition.

[0004] Therefore, it is necessary to provide a measuring fixture that can be stably and reliably connected to the motor shaft. Utility Model Content

[0005] In view of the above situation and to overcome the defects of the prior art, this utility model provides a tooling for measuring the axial movement of a fuel gear motor of a release valve. This tooling can be stably and reliably connected to the motor shaft, thereby providing an installation foundation for the measuring instrument and reducing the risk of possible loosening of the measuring instrument to a certain extent.

[0006] To achieve the above objectives, this utility model provides the following technical solution: This utility model provides a fixture for measuring the axial movement of a fuel gear motor in a release valve, comprising: The base has mounting holes and clearance cavities; the mounting holes are used to mount the measuring instrument. A connecting tube is hollow inside, with one end for extending into the motor shaft and forming an expansion friction connection with the inner wall of the motor shaft; the connecting tube is detachably inserted into the clearance cavity; one end of the connecting tube extending into the motor shaft is provided with a plurality of circumferentially distributed expansion flaps that can deform radially; the inner side of each expansion flap is formed with a driving slope. A drive rod, which passes through the interior of the connecting pipe; in, When the drive rod moves axially within the connecting pipe, it drives each of the expansion valves to expand radially outward via the drive ramp to abut against the inner wall of the motor shaft; or drives each of the expansion valves to contract radially inward to disengage from the inner wall of the motor shaft. Once the connecting pipe is locked to the motor shaft by the expansion valve, the axial movement of the tooling can be measured by the measuring instrument by moving the tooling axially.

[0007] Furthermore, the end of the expansion valve near the motor shaft is provided with a flange extending radially outward, which is used to increase the frictional resistance with the inner wall of the motor shaft.

[0008] Furthermore, the surface of the drive rod is covered with a lubricating layer.

[0009] Furthermore, it further includes: A lock nut, which forms a threaded connection with the connecting pipe; in, The connecting pipe and the clearance cavity of the base form a sliding fit; When the locking nut is tightened and pressed against the base, the base is fixed to the end face of the motor shaft.

[0010] Furthermore, the connecting pipe is installed in the clearance cavity of the base via a threaded connection.

[0011] Furthermore, the side wall of the mounting hole is provided with a first locking screw hole for screwing in a locking screw to fix the measuring instrument installed therein.

[0012] Furthermore, it further includes: A handle for the operator to grip and apply axial tension; the handle is located at the end of the connecting tube away from the base.

[0013] Furthermore, the handle is connected to the connecting tube by a thread.

[0014] Furthermore, a second locking screw hole is provided on the handle; the handle is fixed circumferentially and axially to the connecting tube by a locking screw passing through the second locking screw hole.

[0015] Furthermore, the handle has a stepped cylindrical profile.

[0016] This utility model has at least the following advantages or beneficial effects: This invention employs a base structure, which serves to mount measuring instruments and provide a stable mounting reference. It also incorporates a connecting pipe structure, which allows for a tightening friction connection between the tightening valve and the motor shaft. Furthermore, it utilizes a drive rod structure, which controls the radial deformation of the tightening valve via a driving inclined plane. Overall, this invention achieves a reliable connection to the motor shaft and facilitates the acquisition of axial movement data using measuring instruments.

[0017] This invention employs a structure with a flange at the end of the expansion valve. This flange increases the contact area with the inner wall of the motor shaft and reduces frictional resistance. Overall, this invention improves the fastening effect of the connection and reduces the risk of relative slippage.

[0018] This invention employs a handle structure, which allows the operator to grip and apply axial tension. Overall, this invention provides a convenient point for applying force during the measurement process, improving the operability of the measurement. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 Schematic diagram of the fixture structure for measuring the axial movement of the fuel gear motor of the release valve; Figure 2 for Figure 1 A axial section view of the measuring fixture shown. Figure 3 This is a cross-sectional view of the base; Figure 4 This is a cross-sectional view of the connecting pipe; Figure 5 This is a cross-sectional view of the drive rod; Figure 6 This is a cross-sectional view of the handle.

[0021] Figure label: 1-Base; 11-Mounting hole; 111-First locking screw hole; 12-Leaning cavity; 2-Connecting pipe; 21-Expansion flap; 211-Flange; 22-Drive ramp; 23-Locking nut; 3-Drive lever; 4-Handle; 41-Second locking screw hole; 5 - Output shaft, 51 - Blind hole. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0024] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0025] In this utility model, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of the structural relationship between the various parts or elements of this utility model and do not specifically refer to any part or element in this utility model. They should not be construed as limitations on this utility model.

[0026] In this utility model, terms such as "fixed", "connected", and "linked" should be interpreted broadly, indicating that it can be a fixed connection, an integral connection, or a detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. For relevant scientific researchers or technicians in this field, the specific meaning of the above terms in this utility model can be determined according to the specific circumstances, and should not be construed as a limitation of this utility model.

[0027] The embodiments of this utility model will be described in detail below.

[0028] This utility model discloses a fixture for measuring the axial movement of a fuel gear motor with a release valve. This fixture is mainly used for the precise measurement of the axial clearance of a fuel gear motor in the field of aero-engine maintenance. Specifically, the output shaft 5 of the fuel gear motor has an axial blind hole 51 at its end, which provides a connection interface for the measuring fixture.

[0029] Figure 1 Schematic diagram of the fixture structure for measuring the axial movement of the fuel gear motor of the release valve; Figure 2 for Figure 1 The axial section view of the measuring fixture shown.

[0030] This fixture mainly consists of a base 1, a connecting pipe 2, a drive rod 3, and a handle 4. The base 1 provides the mounting reference for the dial indicator; the connecting pipe 2 cooperates with the drive rod 3 to achieve a controllable tightening connection with the motor shaft; the handle 4 is located on the connecting pipe 2, allowing the operator to apply axial force. Details are as follows: Figure 3 This is a cross-sectional view of base 1.

[0031] The base 1 serves as the fundamental support component of the entire tooling, providing a stable mounting reference and positioning function for the measuring instrument. The base 1 is provided with mounting holes 11 and clearance cavities 12.

[0032] Mounting hole 11 is used to mount measuring instruments such as dial indicators (not shown in the figure), and its diameter is designed according to the diameter of the standard dial indicator rod. A first locking screw hole 111 is provided on the side wall of mounting hole 11, which is used to fix the measuring instrument installed therein by screwing in a locking screw (not shown in the figure) to prevent the measuring instrument from shifting or loosening during the measurement process.

[0033] The cavity 12 provides space for the connecting pipe 2 to pass through.

[0034] Figure 4 This is a cross-sectional view of connecting pipe 2.

[0035] The connecting pipe 2 is detachably inserted into the relief cavity 12.

[0036] In this embodiment, the connecting pipe 2 and the clearance cavity 12 of the base 1 form a sliding fit, with a fit clearance of 0.05~0.1mm. Additionally, a locking nut 23 is installed above the connecting pipe 2. When the locking nut 23 is tightened and pressed against the base 1, the base 1 is fixed to the end face of the motor shaft. This achieves overall fixation of the tooling.

[0037] In other embodiments, the connection between the connecting pipe 2 and the base 1 can also be an interference fit or a threaded connection to achieve overall fixation of the tooling.

[0038] The connecting pipe 2 is the core transmission component of the tooling, and its interior is hollow. Therefore, the connecting pipe 2 can accommodate the drive rod 3 and realize the transmission of force.

[0039] The connecting pipe 2 has multiple circumferentially evenly distributed expansion flaps 21 at one end near the motor shaft. These expansion flaps 21 are formed by wire cutting or other processes and can undergo elastic deformation in the radial direction. Their function is to form a reliable connection with the inner wall of the motor shaft through radial expansion.

[0040] Each expansion valve 21 has a driving ramp 22 formed on its inner side, which converts the axial movement of the driving rod 3 into the radial deformation of the expansion valve 21. In this embodiment, the tilt angle θ of the driving ramp 22 is designed to be 15 degrees. This angle can ensure sufficient radial force while avoiding movement jamming due to excessive angle. In other embodiments, the tilt angle can also be selected in the range of 10-20 degrees.

[0041] The end of the expansion valve 21 near the motor shaft has a flange 211 extending radially outward. The function of the flange 211 is to increase the contact area and frictional resistance with the inner wall of the motor shaft.

[0042] In this embodiment, there are two expansion flaps 21, and the gap width between the flaps is 2mm. In other embodiments, there may be three or four expansion flaps 21, and the gap width between the flaps may be adjusted within the range of 1-3mm. The specific parameters may be optimized according to the actual connection requirements and material properties.

[0043] Figure 5 This is a cross-sectional view of drive rod 3.

[0044] The drive rod 3 is the power component of the tooling, which passes through the inside of the connecting pipe 2. Its function is to drive the expansion valve 21 to produce radial deformation through axial movement. Therefore, under the action of the drive rod 3, the expansion valve 21 can form an expansion friction connection with the inner wall of the motor shaft.

[0045] The surface of the drive rod 3 is covered with a lubricating layer, which reduces the motion friction between the drive rod 3 and the connecting pipe 2. In this embodiment, the lubricating layer is a molybdenum disulfide coating with a thickness of 10~30μm; in other embodiments, the lubricating layer may also be a polytetrafluoroethylene coating or a Teflon coating with a thickness selected in the range of 20~50μm.

[0046] Figure 6 This is a cross-sectional view of the handle.

[0047] The handle 4 is the operating component of the tooling, located at the end of the connecting pipe 2 away from the base 1. Its function is to allow the operator to grip it and apply axial force. In this embodiment, the handle 4 is connected to the connecting pipe 2 by a thread; in other embodiments, the handle 4 and the connecting pipe 2 can also be fixedly connected by a key.

[0048] The handle 4 has a second locking screw hole 41, which is used to fix the handle 4 and the connecting pipe 2 circumferentially and axially by a locking screw passing through the second locking screw hole 41, so as to prevent relative rotation during operation.

[0049] In this embodiment, the handle 4 has a stepped cylindrical shape with a large end diameter of 35mm and a small end diameter of 20mm. This shape design makes it easy for the operator to grip and apply force. In other embodiments, the handle 4 can also have a straight cylindrical shape or other shapes with anti-slip textures, and the diameter can be adjusted within the range of 18-40mm.

[0050] The operating steps for using this tool to assist a dial indicator in measuring the axial movement of the motor shaft are as follows: S100: Mounting base: The base 1 is initially fixed to the end face of the motor shaft; S200: Connecting motor shaft: The connecting pipe 2 is passed through the relief cavity 12 of the base 1, so that the front end of the expansion valve 21, which is in a contracted state, enters the axial blind hole 51 at the end of the motor shaft. Insert the drive rod 3 into the connecting tube 2 and continue to push it forward. The drive inclined surface 22 causes the expansion valve 21 to expand radially until the flange 211 at the front end of the expansion valve 21 forms a tight contact with the inner wall of the blind hole 51 of the motor shaft. S300: Fixed measurement reference: Tighten the locking nut 23 so that its end face presses against the base 1; Insert the dial indicator probe into the mounting hole 11 of the base 1, so that its probe is in perpendicular contact with the reference plane, and fix the dial indicator by the locking screw in the first locking screw hole 111; S400: Perform measurement: The operator holds handle 4 and moves it inward along the axial direction of the motor shaft (i.e., Figure 2 As shown in the diagram (downward), a preload is slowly applied. This preload eliminates the meshing backlash of the gear transmission pairs inside the motor and brings the entire measuring system into a stable initial stress state. Subsequently, the dial indicator pointer is adjusted to zero to complete the calibration of the measurement reference.

[0051] After calibration, the operator reverses the axial direction (i.e.) Figure 2 An axial tensile force is smoothly applied (as shown in the diagram, upward). This tensile force is transmitted to the output shaft 5 of the motor through the connecting pipe 2 and the expansion valve 21, overcoming the axial resistance of its internal bearings and other structures, thereby causing axial movement of the motor shaft.

[0052] During this process, observe and record the maximum displacement value indicated by the dial indicator. This value represents the axial movement of the motor shaft under the current measurement conditions. To ensure the accuracy of the measurement results, the above force application process can be repeated several times, and the average of the stable readings can be taken as the final measurement value.

[0053] S500: Disassembly tooling: Move the drive rod 3 away from the motor to cause the expansion valve 21 to contract radially and separate from the inner wall of the blind hole 51 of the motor shaft; Remove the entire tooling and dial indicator from the end of the motor shaft.

[0054] Overall, this utility model adopts a structural design combining a base 1, a connecting pipe 2, a drive rod 3, and a handle 4. Through the cooperation of the drive rod 3 and the drive inclined surface 22, a controllable tightening connection between the expansion valve 21 and the inner wall of the motor shaft is achieved. The organic combination of these components enables this fixture to improve measurement accuracy and operational convenience to a certain extent during aero-engine maintenance.

[0055] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A fixture for measuring the axial movement of a fuel gear motor in a release valve, characterized in that, include: The base (1) has a mounting hole (11) and a clearance cavity (12) thereon; the mounting hole (11) is used to install measuring instruments; The connecting tube (2) is hollow inside. The connecting tube (2) is detachably inserted into the relief cavity (12) and its lower end can penetrate into the motor shaft. The end of the connecting tube (2) that extends into the motor shaft is provided with a plurality of circumferentially distributed and radially deformable expansion flaps (21). The inner side of each expansion flap (21) is formed with a driving slope (22). The drive rod (3) passes through the interior of the connecting pipe (2); in, When the drive rod (3) moves axially within the connecting tube (2), it drives each of the expansion valves (21) to expand radially outward through the drive ramp (22) to abut against the inner wall of the motor shaft.

2. The fixture for measuring the axial movement of the fuel gear motor of the release valve according to claim 1, characterized in that, The expansion valve (21) has a radially outwardly extending flange (211) at the end near the motor shaft to increase the frictional resistance with the inner wall of the motor shaft.

3. The fixture for measuring the axial movement of the fuel gear motor of the release valve according to claim 1, characterized in that, The surface of the drive rod (3) is covered with a lubricating layer.

4. The fixture for measuring the axial movement of the fuel gear motor of the release valve according to claim 1, characterized in that, Further includes: A lock nut (23) is threadedly connected to the connecting pipe (2); in, The connecting pipe (2) and the relief cavity (12) of the base (1) form a sliding fit; When the locking nut (23) is tightened and pressed against the base (1), the base (1) is fixed to the end face of the motor shaft.

5. The fixture for measuring the axial movement of the fuel gear motor of the release valve according to claim 1, characterized in that, The connecting pipe (2) is installed in the relief cavity (12) of the base (1) by means of threaded connection.

6. The fixture for measuring the axial movement of the fuel gear motor of the release valve according to claim 1, characterized in that, The mounting hole (11) has a first locking screw hole (111) on its side wall for screwing in a locking screw to fix the measuring instrument installed therein.

7. The fixture for measuring the axial movement of the fuel gear motor of the release valve according to claim 1, characterized in that, Further includes: A handle (4) is provided for the operator to hold and apply axial tension; the handle (4) is located at the end of the connecting tube (2) away from the base (1).

8. The fixture for measuring the axial movement of the fuel gear motor of the release valve according to claim 7, characterized in that, The handle (4) is connected to the connecting pipe (2) by a thread.

9. The fixture for measuring the axial movement of the fuel gear motor of the release valve according to claim 7, characterized in that, The handle (4) is provided with a second locking screw hole (41); the handle (4) is fixed to the connecting tube (2) in both the circumferential and axial directions by a locking screw passing through the second locking screw hole (41).

10. The fixture for measuring the axial movement of the fuel gear motor of the release valve according to any one of claims 7 to 9, characterized in that, The handle (4) has a stepped cylindrical shape.

Images