Tool for measuring aperture of 8-shaped gear cavity

Abstract

The utility model discloses a tool for measuring the aperture of an 8-shaped gear cavity, which comprises a hollow measuring body, the measuring body is formed by combining two cylindrical bodies, the outline of the radial cross section of the measuring body is 8-shaped, the side walls of the two radial ends of the measuring body are respectively provided with a distance detection device, and the distance detection devices are connected with the measuring body. The detection end of any distance detection device faces the outer side of the measuring body, a holding handle is arranged on the upper side of the measuring body, and the output ends of the two distance detection devices are electrically connected with the input end of a controller. And the output end of the controller is electrically connected with the input end of a display device. The beneficial effects of the utility model are that whether the size of the cavity meets the tolerance requirement of assembly can be rapidly measured through the tool, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of machinery, in particular to a gear pump, in particular to a tool for measuring the aperture of an 8-shaped gear cavity. Background Art

[0002] The aviation gear fuel pump works on the principle of external gear meshing. Two meshing gears divide the pump body, the front and rear cover plates, and the closed volume surrounded by the gears into two parts, and the driving gear and the driven gear are driven by the transmission shaft. In order to achieve a better boosting effect, in the prior art, the gear cavity in the gear fuel pump is designed as follows: Figure 1 The "8" shape shown. Figure 2 As shown in the figure, the matching bearing used in the "8"-shaped gear cavity is designed as a "D" type, that is, the flat end faces of two "D"-shaped bearings are matched with each other and installed in the "8"-shaped gear cavity to support the rotation of the gear. Among them, the end face clearance formed by the front and rear covers and the bearing and gear end faces cannot be very small due to the limitations of the processing and assembly processes. On the other hand, the clearance will become larger and larger after wear, so the measurement of the assembly clearance value is particularly important.

[0003] Since the gear cavity is cast from aluminum, the molding dimensions vary. In order to match different gear cavities, the bearing size needs to be ground to achieve the purpose of adaptation. Figure 3 , Figure 4 As shown in the tolerance diagram of the 8-shaped gear cavity, the tolerance requirements of the gear cavity are very high, so it is necessary to accurately measure the inner diameter of the gear cavity. The existing measurement method is to use an internal diameter micrometer for measurement. When measuring, it is necessary to first zero the micrometer, then place the micrometer into the gear cavity housing, and shake it up and down to obtain the true size value. However, the above operation is repeated for each gear cavity, which is very time-consuming and cannot meet the fast production process, and the overall efficiency is low. Utility Model Content

[0004] The utility model aims to provide a tool for measuring the aperture of an 8-shaped gear cavity. The tool for measuring the aperture of an 8-shaped gear cavity is intended to solve the technical problem of low working efficiency in measuring the aperture of an 8-shaped gear cavity in a gear pump in the prior art.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A tool for measuring the aperture of an 8-shaped gear cavity, comprising a hollow measuring body, the measuring body being composed of two columnar bodies, the radial cross-section of the measuring body being in the shape of an 8, a distance detection device being respectively arranged on the side walls at both ends of the long diameter of the measuring body, the detection end of any one of the distance detection devices being directed toward the outside of the measuring body, a gripping handle being arranged on the upper side of the measuring body, the output ends of the two distance detection devices being respectively electrically connected to the input end of a controller, and the output end of the controller being electrically connected to the input end of a display device.

[0007] Furthermore, any one of the distance detection devices comprises an electronic probe and a displacement sensor, and an output end of the electronic probe is electrically connected to an input end of the displacement sensor.

[0008] Furthermore, the output end of the distance detection device is connected to the input end of the controller through a data line passing through the inner cavity of the measuring body and the inner cavity of the gripping handle.

[0009] Furthermore, the displacement sensor is arranged at the bottom of the measuring body.

[0010] Working principle:

[0011] If the aperture of the 8-shaped gear cavity is too small, it will not be possible to fit two "D"-shaped bearings; if the aperture of the 8-shaped gear cavity is too large, there will be looseness between the two "D"-shaped bearings and the aperture, which will cause safety hazards. The method of measuring and calibrating by micrometer requires that each gear cavity be measured from scratch, which has low measurement efficiency and is time-consuming and labor-intensive, and is not conducive to rapid production. This device makes a measuring body that meets the process requirements, and sets a distance detection device at both ends of the measuring body. The opening of the gear cavity to be measured is placed upward, and the measuring body is extended into the gear cavity in the vertical direction. If the measuring body cannot be placed in the gear cavity, it means that the size of the gear cavity is too small. If the measuring body can smoothly enter the gear cavity, the maximum size of the two ends of the gear cavity can be measured by the distance detection device to check whether it exceeds the maximum tolerance.

[0012] Compared with the prior art, the utility model has the beneficial effect of: quickly measuring the size of the gear cavity through the tooling to see whether it meets the tolerance requirements of the assembly, thereby improving the production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of an existing aviation gear fuel pump.

[0014] Figure 2 is a schematic diagram of an existing "D" type bearing.

[0015] Figure 3 It is a tolerance diagram of the figure-8 gear cavity.

[0016] Figure 4 yes Figure 3 AA cross-sectional view of .

[0017] Figure 5 The utility model is a structural schematic diagram of a tool for measuring the aperture of an 8-shaped gear cavity.

[0018] Figure 6 yes Figure 5 BB cross-sectional view.

[0019] Figure 7 The utility model is a bottom view schematic diagram of a tool for measuring the aperture of an 8-shaped gear cavity.

[0020] Figure 8 It is a structural schematic diagram of a distance detection device. DETAILED DESCRIPTION

[0021] Example 1

[0022] See also Figure 5 , Figure 6 , Figure 7 , Figure 8 , the utility model provides a technical solution:

[0023] A tool for measuring the aperture of an 8-shaped gear cavity comprises a hollow measuring body 1, the measuring body 1 is composed of two columnar bodies, the radial section of the measuring body 1 has an 8-shaped profile, a distance detection device 2 is respectively arranged on the side walls at both ends of the long diameter of the measuring body 1, the detection end of any distance detection device 2 faces the outside of the measuring body 1, a gripping handle 3 is arranged on the upper side of the measuring body 1, the output ends of the two distance detection devices 2 are respectively electrically connected to the input end of a controller, and the output end of the controller is electrically connected to the input end of a display device.

[0024] Furthermore, any distance detection device 2 includes an electronic probe 21 and a displacement sensor 22 , and an output end of the electronic probe 21 is electrically connected to an input end of the displacement sensor 22 .

[0025] Furthermore, the output end of the distance detection device 2 is connected to the input end of the controller through a data line passing through the inner cavity of the measuring body 1 and the inner cavity of the gripping handle 3 .

[0026] Furthermore, the displacement sensor 22 is arranged at the bottom of the measuring body 1 .

[0027] The working process of this embodiment:

[0028] like Figure 8As shown, the electronic probe 21 is an electronic probe with a self-reset function. The front end of the electronic probe 21 can be convex or concave 2mm with the 0 scale as the reference; the displacement sensor 22 can be an inductive displacement sensor, and the accuracy of the displacement sensor 22 must reach 0.2μm; Figure 3 As shown, the distance between the two ends of the gear cavity is 6.2075±0.00016 mm. The combination of the electronic probe 21 and the displacement sensor 22 can accurately measure the displacement change of the front end of the electronic probe 21.

[0029] The 8-shaped gear cavity is a shape obtained by fitting the flat end faces of two "D"-shaped bearings together, and the measuring body 1 is a shape matching the gear cavity.

[0030] This device is used as a separate measuring station. A display device is arranged on the station. The display device can be a display. The gear cavity to be tested is placed on the station with the opening facing upward. The worker holds the holding handle 3 and extends the measuring body 1 from the opening of the gear cavity to the deepest part of the gear cavity. During this process, the front end of the electronic probe 21 contacts the inner walls at both ends of the gear cavity. The front end of the electronic probe 21 produces a displacement change (convex or concave) due to the change in the inner diameter of the two ends of the gear cavity. The displacement sensor 22 obtains data due to the change in the position of the front end of the electronic probe 21 and feeds it back to the controller. The controller feeds back the information to the worker through the display device, and the worker can know whether the tolerance of the gear cavity meets the process requirements.

[0031] The displacement sensor 22 is arranged at the bottom of the measuring body 1 to facilitate measuring the inner diameter data of the bottom of the gear cavity.

Claims

1. A tool for measuring the aperture of an 8-shaped gear cavity, characterized in that: The invention comprises a hollow measuring body (1), wherein the measuring body (1) is composed of two cylindrical bodies, the radial cross-section of the measuring body (1) is in the shape of an 8, a distance detection device (2) is respectively arranged on the side walls at both ends of the long diameter of the measuring body (1), the detection end of any one of the distance detection devices (2) faces the outside of the measuring body (1), a gripping handle (3) is arranged on the upper side of the measuring body (1), the output ends of the two distance detection devices (2) are respectively electrically connected to the input end of a controller, and the output end of the controller is electrically connected to the input end of a display device.

2. The tool for measuring the aperture of the 8-shaped gear cavity according to claim 1, characterized in that: Any one of the distance detection devices (2) comprises an electronic probe (21) and a displacement sensor (22), wherein the output end of the electronic probe (21) is electrically connected to the input end of the displacement sensor (22).

3. The tool for measuring the aperture of the 8-shaped gear cavity according to claim 1, characterized in that: The output end of the distance detection device (2) is connected to the input end of the controller via a data line passing through the inner cavity of the measuring body (1) and the inner cavity of the gripping handle (3).

4. The tool for measuring the aperture of the 8-shaped gear cavity according to claim 2, characterized in that: The displacement sensor (22) is arranged at the bottom of the measuring body (1).

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