Straight gear worm shaft one-way fixing structure

By using the combined design of thread plugs, support screws, tapered roller bearings and adjusting washers in the spur gear worm shaft in the aerospace field, the one-way axial fixation and axial fixation of the spur gear worm shaft under limited space conditions is achieved. Adjustment solves the problem of excessive space ratio and improves the space efficiency and installation accuracy of the reducer.

CN222377161UActive Publication Date: 2025-01-21GUIZHOU AEROSPACE LINQUAN MOTOR CO LTD
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Patent Information

Application Number
CN202421361361.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-14
Publication Date
2025-01-21
Estimated Expiration
2034-06-14

AI Technical Summary

Technical Problem

In the aerospace field, due to space limitations, the spur gear worm shaft cannot be installed directly in axial direction, and the axial clearance adjustment cannot be achieved, resulting in an excessive proportion of space size.

Method used

By setting thread plugs and support screws in the housing, and using tapered roller bearings and adjusting washers, the one-way axial fixation and adjustment of the spur gear worm shaft is achieved.

Benefits of technology

This design greatly reduces the space volume of the reducer, and by adding or subtracting adjustment pads, the axial position of the spur gear worm shaft can be adjusted, reducing unbalanced load problems caused by machining errors and installation errors.

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Abstract

The utility model provides a straight gear worm shaft one-way fixing structure. The straight gear worm shaft one-way fixing structure comprises a straight gear worm shaft located in a shell. A threaded plugging block is arranged in the side wall of one side of the shell; one end of the straight gear worm shaft is a straight gear, and the other end of the straight gear worm shaft is a worm; a bearing hole is formed in the straight gear and is used for mounting a tapered roller bearing; the worm is connected with a pressing block through a sliding bearing, and the pressing block is connected with the side wall of the other side of the shell. One end of the tapered roller bearing is axially fixed through an axial retainer ring for a hole, and the other end of the tapered roller bearing is fixed by pressing the bearing mounting shaft through a supporting screw. According to the utility model, the tapered roller bearing is arranged in the straight gear and is axially fixed through the supporting screw, so that the space volume of the speed reducer can be greatly reduced; after the supporting screw is screwed out, the straight gear worm shaft can be detached, the axial position of the straight gear worm shaft can be adjusted by adding or reducing the adjusting gasket, and therefore unbalance loading of the worm caused by machining errors and installation errors is reduced.
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Description

Technical Field

[0001] The utility model relates to a one-way fixing structure for a spur gear worm shaft, belonging to the technical field of aerospace. Background Art

[0002] At present, in the aerospace field, due to space limitations, reducers are beginning to develop in the direction of miniaturization, reducing the outer dimensions of the reducer and realizing the integration of multi-stage transmission systems.

[0003] Currently, the installation of spur gear worm shafts is mostly done by adding angular contact ball bearings to the left and right ends of the shaft for fixing, which takes up too much space. In some special reducers, due to spatial position limitations, the spur gear worm shaft cannot be directly installed axially, and the axial clearance cannot be adjusted. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a unidirectional fixing structure of a spur gear worm shaft, which can perform unidirectional axial fixing under the condition of limited spatial installation position.

[0005] The utility model is realized through the following technical solutions.

[0006] The utility model provides a one-way fixing structure of a spur gear worm shaft, comprising a spur gear worm shaft located in a housing; a threaded block is provided in a side wall of one side of the housing; one end of the spur gear worm shaft is a spur gear, and the other end is a worm; a bearing hole is provided inside the spur gear for installing a tapered roller bearing; the worm is connected to a pressure block through a sliding bearing, and the pressure block is connected to the other side wall of the housing; one end of the tapered roller bearing is axially fixed by an axial retaining ring through a hole, and the other end is fixed by pressing the bearing mounting shaft with a support screw; the small end of the support screw passes through the threaded block and is connected to an anti-loosening disk, and the anti-loosening disk is connected to the housing through a screw.

[0007] A threaded through hole is arranged in the threaded block, the large outer diameter end is interference fit with the shell, and the small outer diameter end is clearance fit with the shell.

[0008] The threaded block is connected to the bearing mounting shaft through a shaft sleeve, and an adjusting washer is arranged between the shaft sleeve and the bearing mounting shaft.

[0009] The pressure block is connected to the housing through a spur gear and worm shaft.

[0010] The small end of the support screw is provided with a thread and a hexagonal countersunk hole, and the large end is provided with a hexagonal countersunk hole.

[0011] A hexagonal shaft is arranged inside the anti-loosening disk.

[0012] The beneficial effects of the utility model are as follows: placing the tapered roller bearing inside the spur gear and axially fixing it with a support screw can greatly reduce the spatial volume of the reducer; the spur gear worm shaft can be disassembled after the support screw is unscrewed, and the axial position of the spur gear worm shaft can be adjusted by adding or reducing adjusting gaskets, thereby reducing the eccentric load on the worm caused by processing errors and installation errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the utility model;

[0014] Figure 2 It is a cross-sectional view of the position of the pressing block of the utility model;

[0015] In the figure: 1-adjusting washer, 2-sleeve, 3-threaded block, 4-anti-loosening disk, 5-housing, 6-axial retaining ring for hole, 7-tapered roller bearing, 8-bearing mounting shaft, 9-support screw, 10-pressure block locking screw, 11-sliding bearing, 12-spur gear worm shaft, 13-pressure block. DETAILED DESCRIPTION

[0016] The technical solution of the utility model is further described below, but the scope of protection required is not limited to the description.

[0017] like Figure 1 As shown, a one-way fixing structure of a spur gear worm shaft comprises a spur gear worm shaft 12 located in a housing 5; a threaded block 3 is provided in a side wall of one side of the housing 5; one end of the spur gear worm shaft 12 is a spur gear, and the other end is a worm; a bearing hole is provided inside the spur gear for mounting a tapered roller bearing 7; the worm is connected to a pressure block 13 through a sliding bearing 11, and the pressure block 13 is connected to the other side wall of the housing 5; one end of the tapered roller bearing 7 is axially fixed by an axial retaining ring 6 through a hole, and the other end is fixed by pressing a bearing mounting shaft 8 through a support screw 9; the small end of the support screw 9 passes through the threaded block 3 and is connected to an anti-loosening disk 4, and the anti-loosening disk 4 is connected to the housing 5 through a screw.

[0018] The threaded block 3 is provided with a threaded through hole, the large diameter end thereof is in interference fit with the housing 5 , and the small diameter end thereof is in clearance fit with the housing 5 .

[0019] The threaded block 3 is connected to the bearing installation shaft 8 through the shaft sleeve 2, and an adjusting washer 1 is provided between the shaft sleeve 2 and the bearing installation shaft 8.

[0020] like Figure 2 As shown, the pressure piece 13 is connected to the housing 5 via the spur gear worm shaft 12 .

[0021] The small end of the support screw 9 is provided with a thread and a hexagonal countersunk hole, the hexagonal countersunk hole matches the hexagonal shaft in the anti-loosening disk 4, and the large end is provided with a hexagonal countersunk hole. By rotating the support screw 9 to match the threaded block 3, the axial position of the spur gear worm shaft 12 is fixed.

[0022] The anti-loosening disk 4 is provided with a hexagonal shaft.

[0023] When the screwing position of the support screw 9 is determined, the hexagonal shaft of the anti-loosening disk 4 cooperates with the hexagonal countersunk hole of the support screw 9 to restrict the axial rotation of the support screw 9, thereby realizing the anti-loosening function of the support screw 9.

[0024] Furthermore, the threaded anti-loosening structure of the hexagonal shaft of the anti-loosening disk 4 and the hexagonal countersunk hole of the supporting screw 9 ensures that the supporting screw 9 and the inner ring of the bearing mounting shaft 8 do not rotate or loosen; the threaded hole is processed on the threaded block 3 to avoid processing the shell, thereby reducing the scrapping of shell parts due to eccentric threaded hole processing.

Claims

1. A unidirectional fixing structure of a spur gear and worm shaft, comprising a spur gear and worm shaft (12) located in a housing (5), characterized in that: A threaded block (3) is provided in one side wall of the housing (5); one end of the spur gear worm shaft (12) is a spur gear, and the other end is a worm; a bearing hole is provided inside the spur gear for mounting a tapered roller bearing (7); the worm is connected to a pressing block (13) via a sliding bearing (11), and the pressing block (13) is connected to the other side wall of the housing (5); one end of the tapered roller bearing (7) is axially fixed by an axial retaining ring (6) through a hole, and the other end is fixed by pressing the bearing mounting shaft (8) via a support screw (9); the small end of the support screw (9) passes through the threaded block (3) and is connected to an anti-loosening disk (4), and the anti-loosening disk (4) is connected to the housing (5) via a screw.

2. The one-way fixing structure of the spur gear and worm shaft according to claim 1, characterized in that: The threaded block (3) is provided with a threaded through hole, the large outer diameter end is in interference fit with the housing (5), and the small outer diameter end is in clearance fit with the housing (5).

3. The one-way fixing structure of the spur gear and worm shaft according to claim 1, characterized in that: The threaded block (3) is connected to the bearing mounting shaft (8) via a shaft sleeve (2), and an adjusting washer (1) is provided between the shaft sleeve (2) and the bearing mounting shaft (8).

4. The one-way fixing structure of the spur gear and worm shaft according to claim 1, characterized in that: The pressure block (13) is connected to the housing (5) via a spur gear worm shaft (12).

5. The one-way fixing structure of the spur gear and worm shaft according to claim 1, characterized in that: The small end of the support screw (9) is provided with a thread and a hexagonal countersunk hole, and the large end is provided with a hexagonal countersunk hole.

6. The one-way fixing structure of the spur gear and worm shaft according to claim 1, characterized in that: The anti-loosening disk (4) is provided with a hexagonal shaft.