A normally closed face gear locking assembly

Abstract

A normally closed end face gear locking assembly includes two symmetrically arranged end face gear brackets. A limiting groove is provided on the end face gear bracket. A main shaft is provided between the two end face gear brackets. A flange structure is provided on the outer side of the main shaft. A moving gear is provided at the upper end of the flange structure. A fixed gear is provided at the upper end of the moving gear. A main shaft cage is provided between the fixed gear and the main shaft. Main shaft balls are installed in the main shaft cage. A main shaft end cover is provided at the upper end of the main shaft cage. A cross is fixed at the upper end of the fixed gear. The left and right ends of the cross are respectively clamped in the limiting grooves on the two end face gear brackets through pressing plates. End blind holes are provided on the upper end faces of the left and right ends of the cross. Springs are provided in the end blind holes. Gaskets are provided at the upper ends of the springs. Adjusting screw holes corresponding to the end blind holes are provided on the pressing plates. Adjusting screws are installed on the adjusting screw holes. The present invention can maintain the positioning accuracy of the shafting after the shafting is locked.

Description

Technical Field

[0001] The present invention relates to a locking assembly, and more particularly to a normally closed end face gear locking assembly. Background Art

[0002] In some application scenarios, the impact force has a great influence on the accuracy of the shafting, which is not conducive to achieving precise angular position accuracy. For example, when using test equipment during the movement of vehicle-mounted equipment, when using test equipment under harsh sea conditions for shipborne equipment, and when using test equipment in an environment with engine vibration for airborne equipment, in these cases, it is necessary to lock the precision shafting.

[0003] Common mechanical shafting locking mechanisms include electromagnetic locking brakes, expansion (compression) locking mechanisms, pin locking mechanisms, and end face gear locking mechanisms, etc. Among them, in the end face gear locking mechanism, both the moving teeth and the fixed teeth are precision machined. The minimum mechanical resolution can reach 1 degree, and the positioning accuracy is 0.2 arc seconds. The number of teeth of the end face moving teeth and the fixed gear in the end face gear locking mechanism applied in this case is 72 teeth, and the meshing of the two can achieve a mechanical position resolution of 5 degrees for two shaftings.

[0004] Existing solutions include: application scenario analysis of electromagnetic clutches, application scenario analysis of thin-walled sleeves, and application scenario analysis of pin locking.

[0005] Application scenario analysis of electromagnetic clutches: After the rotating shaft is in place, the mechanical locking method mainly uses an electromagnetic clutch. This locking method has noise, and the position will change after locking, and it is not applicable in working conditions less than ±2 arc seconds.

[0006] Application scenario analysis of thin-walled sleeves: Relying on the thin-walled sleeve, by applying expansion or compression to the thin-walled sleeve in the circumferential direction, and relying on the deformation of the thin-walled sleeve to lock the rotating shaft, it is difficult to control the locking force in this way.

[0007] Application scenario analysis of pin locking: A number of groups of holes are machined at specific positions on the turntable, and pins are inserted at the required positions to achieve the locking of the shafting. This method has low locking accuracy and low mechanical resolution. Summary of the Invention

[0008] The object of the present invention is to provide a normally closed end face gear locking assembly to solve the problems in the above background art.

[0009] The technical solution adopted to achieve the above object is a normally closed face gear locking assembly, which includes two symmetrically arranged face gear brackets. A limit groove is provided on the face gear bracket. A main shaft is provided between the two face gear brackets. A flange structure is provided on the outer side of the main shaft. A moving gear is provided at the upper end of the flange structure. A fixed gear is provided at the upper end of the moving gear. A main shaft cage is provided between the fixed gear and the main shaft. Main shaft balls are installed in the main shaft cage. A main shaft end cover is provided at the upper end of the main shaft cage. A cross is fixed at the upper end of the fixed gear. The left and right ends of the cross are respectively clamped in the limit grooves on the two face gear brackets through pressure plates. End blind holes are provided on the upper end faces of the left and right ends of the cross. Springs are provided in the end blind holes. Gaskets are provided at the upper ends of the springs. Adjusting screw holes corresponding to the end blind holes are provided on the pressure plates, and adjusting screws are installed on the adjusting screw holes.

[0010] Further, the moving gear and the fixed gear are meshed with each other.

[0011] Further, the pressure plate is located at the upper end of the limit groove and is fixedly connected with the face gear bracket through a fixing screw.

[0012] Further, the front and rear ends of the cross are located between the two face gear brackets. Side cages are provided on the side parts of the front and rear ends of the cross. Side balls are provided in the side cages. Side pressure plates for restricting the side cages are fixed on the end faces of the front and rear ends of the cross.

[0013] Further, the main shaft is fixed at the upper end of the moving base. A fixed base is provided outside the moving base. The two face gear brackets are symmetrically fixed at the upper end of the fixed base.

[0014] Further, upper blind holes are provided on the upper end faces of the front and rear ends of the cross.

[0015] Beneficial effects

[0016] Compared with the prior art, the present invention has the following advantages.

[0017] 1. The face gear locking assembly is designed as a normally closed assembly, which can be installed at the end of a precision shafting to achieve precision mechanical positioning; during actual use, it can be disengaged by applying an external force along the axial direction, and automatic locking can be achieved after the external force is withdrawn;

[0018] 2. The pre-tightening force between the fixed gear and the moving gear in the face gear locking assembly can be adjusted according to actual needs, which is convenient for use in different application scenarios, especially in scenarios with external impact forces;

[0019] 3. Designing the face gear locking assembly according to the modular method is beneficial to realizing pre-production and improving production efficiency. Description of the drawings

[0020] The present invention will be further described in detail below with reference to the accompanying drawings.

[0021] Figure 1 is the front view of the sectional structure of the present invention;

[0022] Figure 2 is the top view of the sectional structure of the present invention;

[0023] Figure 3 is the schematic diagram of the three - dimensional structure of the present invention;

[0024] Figure 4 is the front view of the structure of the present invention;

[0025] Figure 5 is the side view of the structure of the present invention;

[0026] Figure 6 is the top view of the structure of the present invention;

[0027] Figure 7 is the schematic diagram of the structure of the face gear support in the present invention;

[0028] Figure 8 is the top view of the structure of the face gear support in the present invention;

[0029] Figure 9 is the schematic diagram of the structure of the cross in the present invention;

[0030] Figure 10 is the top view of the structure of the cross in the present invention;

[0031] Figure 11 is the schematic diagram of the structure of the moving gear in the present invention;

[0032] Figure 12 is the schematic diagram of the structure of the fixed gear in the present invention;

[0033] Figure 13 is the application schematic diagram of the present invention. Specific embodiments

[0034] The present invention will be further described below in conjunction with embodiments and the accompanying drawings.

[0035] Such as Figures 1 - 13As shown in the figure, a normally closed end face gear locking assembly includes two symmetrically arranged end face gear brackets 1. A limiting groove 8 is provided on the end face gear bracket 1. A main shaft 12 is arranged between the two end face gear brackets 1. A flange structure 9 is provided on the outer side of the main shaft 12. A moving gear 11 is provided at the upper end of the flange structure 9. A fixed gear 10 is provided at the upper end of the moving gear 11. A main shaft cage 7 is arranged between the fixed gear 10 and the main shaft 12. Main shaft steel balls 6 are installed in the main shaft cage 7. A main shaft end cover 5 is provided at the upper end of the main shaft cage 7. A cross 4 is fixed at the upper end of the fixed gear 10. The left and right ends of the cross 4 are respectively clamped in the limiting grooves 8 on the two end face gear brackets 1 through pressure plates 3. End blind holes 17 are provided on the upper end faces of the left and right ends of the cross 4. Springs 2 are provided in the end blind holes 17. Gaskets 18 are provided at the upper ends of the springs 2. Adjusting screw holes 16 corresponding to the end blind holes 17 are provided on the pressure plates 3. Adjusting screws 19 are installed on the adjusting screw holes 16.

[0036] The flange structure 9 is fixedly connected to the outer side wall of the lower end of the main shaft 12. The moving gear 11 sleeved on the main shaft 12 is fixed at the upper end of the flange structure 9. The fixed gear 10 sleeved on the main shaft 12 meshes with the upper end of the moving gear 11.

[0037] The pressure plate 3 is located at the upper end of the limiting groove 8 and is fixedly connected to the end face gear bracket 1 through fixing screws.

[0038] The front and rear ends of the cross 4 are located between the two end face gear brackets 1. Side cages 14 are provided on the side parts of the front and rear ends of the cross 4. Side steel balls 13 are provided in the side cages 14. Side pressure plates 15 for restricting the side cages 14 are fixed on the end faces of the front and rear ends of the cross 4.

[0039] The main shaft 12 is fixed at the upper end of the moving base 21. A fixed base 22 is provided outside the moving base 21. The two end face gear brackets 1 are symmetrically fixed at the upper end of the fixed base 22.

[0040] Upper blind holes 20 are provided on the upper end faces of the front and rear ends of the cross 4.

[0041] In the present invention, the cross 4 drives the fixed gear 10 to slide up and down along the main shaft 12, and the main shaft 12 drives the gear 11 to rotate around the main shaft 12; end blind holes 17 are provided on the upper end faces of the left and right ends of the cross 4. Springs 2 are placed in the end blind holes 17. The two end face gear brackets 1 are symmetrically arranged split structures, and the lower end faces of the two end face gear brackets 1 are coplanar. By adjusting the screwing-in amounts of the two adjusting screws 19, the locking force between the fixed gear 10 and the moving gear 11 can be indirectly adjusted.

[0042] The working principle of the present invention is that in actual use, the face gear bracket 1 and the main shaft 12 are respectively connected to the fixed base 22 and the moving base 21. By applying an external force along the axial direction to the cross 4, the fixed gear 10 and the moving gear 11 can be disengaged. At this time, the main shaft 12 can be freely rotated. After rotating to the specified position, the external force can be withdrawn, and the locking between the moving gear 11 and the fixed gear 10 is realized by the pressing force of the mechanism itself, thereby realizing the locking of the rotating shaft. And by adjusting the screw 19, the telescopic length of the spring 2 is adjusted, and then the pre-tightening force between the fixed gear 10 and the moving gear 11 is adjusted. The purpose of this pre-tightening force is to maintain the positioning accuracy of the shafting after the shafting is locked.

[0043] In the specific implementation of the present invention, the mounting end faces for supporting the main shaft 12 and the face gear bracket 1 are two different end faces. The main shaft 12 is installed on the end face of the moving base 21, and the face gear bracket 1 is installed on the end face of the fixed base 22, and the end face distance between the moving base 21 and the fixed base 22 is 2.5 mm.

[0044] With the main shaft 12 as the support, the moving gear 11 is fixed on the flange structure 9 on the side wall of the main shaft 12 with screws. The main shaft cage 7 is installed on the outer cylindrical surface of the main shaft 12, and the main shaft steel balls 6 are embedded in the main shaft cage 7. The main shaft end cover 5 is fixed on the upper end of the main shaft 12 with screws for axially fixing the main shaft cage 7. The fixed gear 10 is sleeved on the main shaft 12 and is radially matched with the main shaft steel balls 6, and the fixed gear 10 moves downward to realize meshing with the moving gear 11.

[0045] The two split and symmetrically arranged face gear brackets 1 are fixed on the fixed base 22 with screws. The inner cylindrical surface of the face gear bracket 1 is concentric with the outer cylindrical surface of the fixed gear 10. The cross 4 is inserted into the limit groove 8 on the face gear bracket 1 in sequence. A pair of side cages 14 are installed at both ends of the split part of the two face gear brackets 1. The side steel balls 13 are installed in the side cages 14, and then the side pressure plates 15 are fixed on the front and rear ends of the cross 4 with screws. After the installation is completed, it should be ensured that the cross 14 slides smoothly along the axial direction.

[0046] The spring 2 and the gasket 18 are sequentially installed in the end blind holes 17 at the left and right ends of the cross 4. The upper end of the gasket 18 is pressed by the pressure plate 3, and the adjusting screw 19 is screwed into the adjusting screw hole 16 on the pressure plate 3. The pressure plate 3 is fixed on the face gear bracket 1 with screws;

[0047] The cross 4 is fixed on the upper end face of the fixed gear 10 with screws. By applying an external force along the axial direction to the cross 4, the fixed gear 10 and the moving gear 11 can be disengaged. After the external force is withdrawn, the fixed gear 10 and the moving gear 11 are automatically locked by relying on their own characteristics.

[0048] After the fixed gear 10 and the moving gear 11 are disengaged, the moving gear 11 can be driven by the main shaft 12 to rotate around the axis; during the rotation of the moving gear 11, it is prohibited for the fixed gear 10 to slide downward, otherwise the precision of the external teeth may be damaged. When the moving gear 11 reaches the fixed position, the fixed gear 10 can slide downward slowly.

[0049] In practical applications, the number of teeth of the face gear locking assembly described in the present invention can be increased or decreased according to actual resolution requirements to meet different application scenarios.

[0050] The face gear locking assembly described in the present invention is a normally closed assembly and can be installed at the end of a precision shafting to achieve precision mechanical positioning; in actual use, it can be disengaged by applying an external force along the axial direction, and can be automatically locked after the external force is withdrawn; the pre-tightening force between the fixed gear and the moving gear in the face gear locking assembly can be adjusted according to actual needs, which is convenient for use in different application scenarios, especially in the case of external impact force; designing the face gear locking assembly according to the modular method is conducive to pre-production and improving production efficiency.

Claims

1. A normally closed face gear locking assembly, comprising two symmetrically arranged face gear brackets (1), characterized in that, A limiting groove (8) is provided on the end face gear bracket (1). A main shaft (12) is provided between two end face gear brackets (1). A flange structure (9) is provided on the outer side of the main shaft (12). A moving gear (11) is provided at the upper end of the flange structure (9). A fixed gear (10) is provided at the upper end of the moving gear (11). A main shaft cage (7) is provided between the fixed gear (10) and the main shaft (12). A main shaft ball (6) is installed in the main shaft cage (7). A main shaft end cover (5) is provided at the upper end of the main shaft cage (7). A cross (4) is fixed at the upper end of the fixed gear (10). The left and right ends of the cross (4) are respectively clamped in the limiting grooves (8) on two end face gear brackets (1) through pressure plates (3). End blind holes (17) are provided on the upper end faces of the left and right ends of the cross (4). Springs (2) are provided in the end blind holes (17). Gaskets (18) are provided at the upper ends of the springs (2). Adjusting screw holes (16) corresponding to the end blind holes (17) are provided on the pressure plates (3). Adjusting screws (19) are installed on the adjusting screw holes (16); The flange structure (9) is fixedly connected to the outer side wall of the lower end of the main shaft (12). A moving gear (11) sleeved on the main shaft (12) is fixed at the upper end of the flange structure (9). A fixed gear (10) sleeved on the main shaft (12) is meshed with the upper end of the moving gear (11); The pressure plate (3) is located at the upper end of the limiting groove (8) and is fixedly connected to the end face gear bracket (1) through fixing screws.

2. The normally-closed face gear locking assembly according to claim 1, wherein The front and rear ends of the cross (4) are located between two end face gear brackets (1). Side cages (14) are provided on the side parts of the front and rear ends of the cross (4). Side balls (13) are provided in the side cages (14). Side pressure plates (15) for limiting the side cages (14) are fixed on the end faces of the front and rear ends of the cross (4).

3. The normally-closed face gear locking assembly according to claim 1, wherein, The main shaft (12) is fixed at the upper end of the moving base (21). A fixed base (22) is provided outside the moving base (21). Two end face gear brackets (1) are symmetrically fixed at the upper end of the fixed base (22).

4. A normally-closed face gear locking assembly according to claim 1, characterized in that, Upper blind holes (20) are provided on the upper end faces of the front and rear ends of the cross (4).

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