A pitch axis system equipped with a positioning gear plate and a method for installing the positioning gear plate

Abstract

A pitch axis system with a positioning gear disc installed and a method for installing the positioning gear disc, comprising a base, a main shaft fixedly installed in the base through a bearing assembly, an inner bracket fixedly installed on one side of the base, a plurality of symmetrical openings on the side wall of the inner bracket, an inner gear disc fixedly sleeved on the main shaft at the inner side of the inner bracket, an inner sleeve movably sleeved on the main shaft on one side of the inner gear disc, an outer gear disc meshing with the inner gear disc fixedly sleeved on the inner sleeve, an outer bracket movably sleeved on the main shaft on one side of the outer gear disc, a handle provided on the outer bracket, a micrometer fixed on the base through the bracket, the micrometer passes through the opening on the inner bracket and contacts the outer gear disc, two protrusions matching the openings on the inner bracket are provided on the outer bracket, outer slide plates are fixed on the upper and lower sides of the protrusions, and a baffle is fixed on the outer end of the protrusions. The present invention can continuously reduce the eccentricity error of the gear disc meshing circle according to the micrometer indication data, thereby improving the adjustment efficiency of the positioning gear disc.

Description

Technical Field

[0001] The invention relates to a pitch shaft system with a positioning gear disc installed and a method for installing the positioning gear disc. Background Art

[0002] During the development of inertial navigation test equipment, there are two ways to achieve positioning accuracy. One is electrical positioning accuracy, which is mainly achieved by control algorithms and angle sensors. The other is mechanical positioning accuracy, which is mainly achieved by mechanical methods, such as positioning pins, blocks, and expansion sleeve locking. These two positioning methods have their own advantages and disadvantages and can be used in different occasions. The positioning gear belongs to the mechanical positioning range and can be used in applications with an interval of 1 degree within a 360-degree range. This positioning method has high repeatability and reliability and can be used in applications with impact.

[0003] Improving the machining accuracy of the positioning gear itself is a necessary condition for achieving mechanical positioning accuracy. The installation accuracy of the positioning gear can also affect the positioning accuracy of the shaft system. The positioning gear consists of two parts, the inner gear and the outer gear. It is a type of end face gear. General end face gears are only made by milling and grinding. The positioning accuracy produced by this processing technology when the end gears mesh with each other is angular grading, which does not meet the application requirements in the field of inertial navigation testing.

[0004] In practical applications, the processing accuracy of the toothed disc is a necessary condition to meet the use requirements, and the assembly method is the last step to meet the use requirements. If the assembly method is not set reasonably, it will lead to repeated disassembly and assembly of the toothed disc, which may damage the toothed disc during the disassembly and assembly process. Summary of the invention

[0005] The purpose of the present invention is to provide a pitch axis system equipped with a positioning gear plate and a method for installing the positioning gear plate, so as to solve the problems in the above-mentioned background technology.

[0006] The technical solution adopted to achieve the above-mentioned purpose is a pitch axis system equipped with a positioning gear disc, including a base, a main shaft fixedly installed in the base through a bearing assembly, an inner bracket fixedly installed on one side of the base, a plurality of symmetrical openings are provided on the side wall of the inner bracket, an inner gear disc is fixedly mounted on the main shaft at the inner side of the inner bracket, an inner sliding sleeve movably mounted on the main shaft is provided on one side of the inner gear disc, an outer gear disc meshing with the inner gear disc is fixedly mounted on the inner sliding sleeve, an outer bracket movably mounted on the main shaft is fixed on one side of the outer gear disc, a handle is provided on the outer bracket, a micrometer is fixed on the base through the bracket, the micrometer passes through the opening on the inner bracket and contacts with the outer gear disc, and two protrusions matching the openings on the inner bracket are provided on the outer bracket, outer sliding plates are fixed on the upper and lower sides of the protrusions, and a baffle is fixed on the outer end of the protrusions.

[0007] Furthermore, the main shaft is a stepped shaft, and the inner gear disc is fixed on the stepped surface of the main shaft by screws.

[0008] Furthermore, there are four openings, which are respectively located at 0 degrees, 90 degrees, 180 degrees and 270 degrees on the side wall of the inner bracket.

[0009] A method for installing a positioning gear disc of a pitch axis system equipped with a positioning gear disc, the method comprising the following steps:

[0010] (1) First, lightly tighten the screws between the inner gear disc and the spindle to adjust the eccentricity by tapping the outer circle of the inner gear disc with a rubber hammer. The dial gauge head should be close to the outer cylindrical surface of the outer gear disc.

[0011] (2) Slide the outer gear disc axially to mesh with the inner gear disc, record the dial gauge reading, and after the outer gear disc is disengaged, rotate the inner gear disc 180 degrees to record the data. Determine the adjustment direction according to the dial gauge indication. Use a rubber hammer to gently tap the outer circle of the inner gear disc to adjust the eccentricity of the inner gear disc about the axis, and ensure that the eccentricity at the 0 degree and 180 degree positions is 0.

[0012] (3) Select the next set of symmetrical points at 90 and 270 degrees, rotate the pitch axis by 90 degrees, and determine it as 0 degrees. Repeat the above process to ensure that the eccentricity at the two positions of 0 and 180 degrees is 0. After adjusting the eccentricity of the inner gear disc about the axis, use screws to fasten the inner gear disc to the stepped surface of the main shaft to complete the installation of the positioning gear disc.

[0013] Beneficial Effects

[0014] Compared with the prior art, the present invention has the following advantages.

[0015] The advantage of the present invention is that during the entire adjustment process, the inner gear disc is installed on the main shaft, and the entire set of gear discs does not need to be disassembled. The eccentricity of the inner gear disc can be adjusted online in real time, and the eccentricity error of the gear disc meshing circle is continuously reduced according to the data indicated by the micrometer, thereby improving the adjustment efficiency of the positioning gear disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0017] Figure 1 is a front view of the structure cross-section of the present invention;

[0018] Figure 2 is a top view of the structure of the present invention;

[0019] Figure 3 is a three-dimensional view of the present invention;

[0020] Figure 4 It is a three-dimensional view of the inner gear disc in the present invention;

[0021] Figure 5 is a three-dimensional view of the outer gear disc of the present invention;

[0022] Shown in the figure: 1. micrometer, 2. outer gear disc, 3. inner gear disc, 4. outer bracket, 5. spindle, 6. handle, 7. inner sleeve, 8. inner bracket, 9. base, 10. bearing assembly, 11. outer slide plate, 12. baffle, 13. opening, 14. bump. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with embodiments and drawings.

[0024] A pitch axis system with a positioning gear plate installed, comprising a base 9, such as Figure 1-Figure 5 As shown, a main shaft 5 is fixedly mounted via a bearing assembly 10 in the base 9, an inner bracket 8 is fixedly mounted on one side of the base 9, a plurality of symmetrical openings 13 are provided on the side wall of the inner bracket 8, an inner gear disc 3 is fixedly mounted on the main shaft 5 at the inner side of the inner bracket 8, an inner sleeve 7 movably mounted on the main shaft 5 is provided on one side of the inner gear disc 3, an outer gear disc 2 meshing with the inner gear disc 3 is fixedly mounted on the inner sleeve 7, an outer bracket 4 movably mounted on the main shaft 5 is fixedly mounted on one side of the outer gear disc 2, a handle 6 is provided on the outer bracket 4, a micrometer 1 is fixed on the base 9 via a bracket, the micrometer 1 passes through the opening 13 on the inner bracket 8 and contacts with the outer gear disc 2, two protrusions 14 matching with the opening 13 on the inner bracket 8 are provided on the outer bracket 4, outer slide plates 11 are fixed on the upper and lower sides of the protrusion 14, and a baffle 12 is fixed on the outer end of the protrusion 14.

[0025] The main shaft 5 is a stepped shaft, and the inner gear disc 3 is fixed on the stepped surface of the main shaft 5 by screws.

[0026] There are four openings 13 , which are respectively located at positions of 0 degrees, 90 degrees, 180 degrees and 270 degrees on the side wall of the inner bracket 8 .

[0027] A method for installing a positioning gear disc of a pitch axis system equipped with a positioning gear disc, the method comprising the following steps:

[0028] (1) First, lightly tighten the screws between the inner gear disc 3 and the main shaft 5, so as to adjust the eccentricity by tapping the outer circle of the inner gear disc 3 with a rubber hammer, and the head of the micrometer 1 is close to the outer cylindrical surface of the outer gear disc 2;

[0029] (2) Slide the outer gear disc 2 axially to mesh with the inner gear disc 3, record the reading of the dial gauge 1, and after the outer gear disc 2 is disengaged, rotate the inner gear disc 3 180 degrees to record the data. Determine the adjustment direction according to the indication of the dial gauge 1. Use a rubber hammer to gently tap the outer circle of the inner gear disc 3 to adjust the eccentricity of the inner gear disc 3 about the axis, and ensure that the eccentricity at the two positions of 0 degree and 180 degree is 0;

[0030] (3) Select the next set of symmetrical points of 90 degrees and 270 degrees, rotate the pitch axis 90 degrees, and determine it as 0 degrees. Repeat the above process to ensure that the eccentricity at the two positions of 0 degrees and 180 degrees is 0. After adjusting the eccentricity of the inner gear disc 3 about the axis, use screws to fasten the inner gear disc 3 to the stepped surface of the main shaft 5 to complete the installation of the positioning gear disc.

[0031] In the present invention, the main shaft 5 is matched with the bearing assembly 10 to form a shaft system, the inner gear plate 3 is matched with the main shaft 5, the inner gear plate 3 is preliminarily aligned and positioned through the main shaft 5, the outer gear plate 2 is matched with the main shaft 5 through the inner sleeve 7, and the outer bracket 4 is matched with the inner bracket 8 through the outer slide plate 11.

[0032] The inner gear disc 3 fits the stepped end surface of the main shaft 5, and there is a clearance fit between the inner gear disc 3 and the axial hole of the main shaft 5; the inner gear disc 3 and the main shaft 5 are fastened with screws, and the friction force generated by tightening the screws ensures that the inner gear disc 3 and the end surface of the main shaft 5 are tightly attached, and the inner gear disc 3 does not loosen when the main shaft 5 rotates.

[0033] The outer gear disc 2 slides inwardly to cooperate with the inner gear disc 3, and the head of the micrometer 1 is close to the outer cylindrical surface of the outer gear disc 2. The reading of the micrometer 1 on the cylindrical surface of the outer gear disc 2 reflects the eccentricity of the inner gear disc 3.

[0034] Pass through the gap of the inner bracket 8, use a rubber hammer to gently tap the outer circle of the inner gear disc 3 to adjust the eccentricity of the inner gear disc 3 about the axis. After the eccentricity of the inner gear disc 3 about the axis is adjusted to the right position, use screws to fasten the inner gear disc 3 to the end face of the main shaft 5, and equip it with two positioning pins.

[0035] The working principle of the present invention is that after the inner gear disc 3 and the outer gear disc 2 are meshed with each other, a virtual meshing circle will exist. The head of the micrometer 1 is close to the outer circle of the outer gear disc 2, which is used to observe and collect data on the meshing circle. After the outer gear disc 2 slides axially and meshes with the inner gear disc 3, the first point of the meshing circle is recorded; after the outer gear disc 2 slides axially and disengages from the inner gear disc 3, the rotating shaft system drives the inner gear disc 3 to rotate to the next position, and after the outer gear disc 2 slides axially and meshes with the inner gear disc 3, the second point of the meshing circle is recorded. This process is repeated continuously, and multiple data can be collected and the meshing circle of the positioning gear disc can be fitted.

[0036] Generally, the symmetrical method is used to collect data. The current position of the inner gear disc is recorded as 0 degrees. After the gear disc is engaged, the micrometer data is recorded as A. The inner gear disc is rotated 180 degrees, and the micrometer data is recorded as B. After the outer gear disc is disengaged, the eccentricity of the inner gear disc is adjusted with a rubber hammer according to the micrometer reading. This process is repeated until the end.

[0037] Rotate the shaft system 90 degrees to the next position, record the current position of the inner gear disc as 0 degrees, and repeat the above process until.

[0038] In order to achieve a mechanical positioning accuracy of 2 arc seconds for the pitch axis system and a position interval of 1 degree, geared disc positioning is usually used. Geared disc positioning has high repeatability and higher impact resistance than electrical positioning. In the process of achieving mechanical positioning requirements, the installation method is equally important. According to the installation method described in the present invention, during the adjustment of the entire geared disc positioning device, the inner geared disc is installed on the main shaft without disassembling the entire set of geared discs. The eccentricity of the inner geared disc can be adjusted online in real time, and the eccentricity error of the geared disc meshing circle is continuously reduced according to the micrometer indication data, thereby improving the adjustment efficiency of the positioning geared disc.

Claims

1. A pitch axis system equipped with a positioning gear disc, comprising a base (9), characterized in that: A main shaft (5) is fixedly mounted in the base (9) via a bearing assembly (10); an inner bracket (8) is fixedly mounted on one side of the base (9); a plurality of symmetrical openings (13) are provided on the side wall of the inner bracket (8); an inner toothed disc (3) is fixedly mounted on the main shaft (5) at an inner side of the inner bracket (8); an inner sleeve (7) movably mounted on the main shaft (5) is provided on one side of the inner toothed disc (3); an outer toothed disc (2) meshing with the inner toothed disc (3) is fixedly mounted on the inner sleeve (7); and the outer toothed disc (2) is provided with a plurality of symmetrical openings (13). An outer bracket (4) movably mounted on the main shaft (5) is fixed on one side, a handle (6) is provided on the outer bracket (4), a dial gauge (1) is fixed on the base (9) via the bracket, the dial gauge (1) passes through an opening (13) on the inner bracket (8) and contacts the outer gear disc (2), the outer bracket (4) is provided with two protrusions (14) matching with the opening (13) on the inner bracket (8), the upper and lower sides of the protrusion (14) are fixed with outer slide plates (11), and the outer end of the protrusion (14) is fixed with a baffle (12); The main shaft (5) is a stepped shaft, and the inner gear disc (3) is fixed on the stepped surface of the main shaft (5) by screws; there are four openings (13), and the four openings (13) are respectively located at positions of 0 degrees, 90 degrees, 180 degrees and 270 degrees on the side wall of the inner bracket (8); The positioning gear disc installation method includes the following steps: (1) First, lightly tighten the screws between the inner gear disc (3) and the main shaft (5) to achieve the purpose of adjusting the eccentricity by tapping the outer circle of the inner gear disc (3) with a rubber hammer, and the head of the micrometer (1) is close to the outer cylindrical surface of the outer gear disc (2); (2) After the outer gear disc (2) is axially slid to mesh with the inner gear disc (3), the reading of the dial gauge (1) is recorded. After the outer gear disc (2) is disengaged, the inner gear disc (3) is rotated 180 degrees to record the data. The adjustment direction is determined according to the indication of the dial gauge (1). Use a rubber hammer to gently tap the outer circle of the inner gear disc (3) to adjust the eccentricity of the inner gear disc (3) about the axis, and ensure that the eccentricity at the two positions of 0 degree and 180 degree is 0; (3) Select the next set of symmetrical points, 90 degrees and 270 degrees, rotate the pitch axis 90 degrees, and determine it as 0 degrees. Repeat the above process to ensure that the eccentricity at the two positions of 0 degrees and 180 degrees is 0. After adjusting the eccentricity of the inner gear disc (3) about the axis center to the right position, use screws to fasten the inner gear disc (3) to the stepped surface of the main shaft (5) to complete the installation of the positioning gear disc.

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